/* ============================================================
   Manhattan Academy of Music and Language — landing page
   Single font: Be Vietnam Pro

   Style: Japanese / Swiss editorial restraint.
   Sharp slabs (border-radius 2px), thin rules, generous white
   space, no pills, no fat rounded cards, no colored washes.
   Color is a punctuation mark — used only on the swapped word
   inside a trailer card and the active card's 2px top hairline.
   ============================================================ */

*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --bg: #ffffff;
  --ink: #0a0a0a;
  --ink-2: #2a2a2a;
  --muted: #6a6a6a;
  --muted-2: #9a9a9a;
  --line: #e6e6e6;
  --pill: #f3f3f3;
  --pill-hover: #ebebeb;

  --max: 1180px;
  --pad: clamp(20px, 4vw, 56px);

  /* Swiss restraint: every corner on the page is 2px. */
  --radius: 2px;

  --t-fast: 180ms cubic-bezier(.2, .7, .2, 1);
  --t-med:  360ms cubic-bezier(.2, .7, .2, 1);
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Be Vietnam Pro", system-ui, -apple-system, sans-serif;
  font-weight: 400;
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ---------- Topbar ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: grid;
  grid-template-columns: max-content 1fr auto;
  align-items: center;
  gap: 24px;
  width: 100%;
  padding: 18px var(--pad);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: stretch;
  gap: 14px;
  min-height: 44px;
}

.brand-logo {
  align-self: stretch;
  height: auto;
  width: auto;
  min-height: 44px;
  max-height: 56px;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  display: block;
  flex-shrink: 0;
}

.brand-name {
  display: flex;
  flex-direction: column;
  justify-content: center;
  line-height: 1.15;
}

.brand-en {
  font-weight: 800;
  font-size: 15px;
  letter-spacing: -0.01em;
  color: var(--ink);
  white-space: nowrap;
}

.brand-vi {
  font-weight: 400;
  font-size: 12px;
  color: var(--muted);
  font-style: italic;
  white-space: nowrap;
}

.topnav {
  grid-column: 3;
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  align-items: center;
  gap: 0 4px;
  row-gap: 4px;
  justify-self: end;
  min-width: 0;
}

/* Topnav: no pills. Plain text with a subtle 1px underline on
   hover — Swiss editorial, no background washes. */
.topnav a {
  position: relative;
  padding: 8px 2px;
  margin: 0 10px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--ink-2);
  transition: color var(--t-fast);
}

.topnav a::after {
  content: "";
  position: absolute;
  left: 2px;
  right: 2px;
  bottom: 4px;
  height: 1px;
  background: var(--ink);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--t-fast);
}

.topnav a:hover {
  color: var(--ink);
}

.topnav a:hover::after {
  transform: scaleX(1);
}

/* ---------- Main ---------- */
main {
  width: 100%;
  max-width: none;
  margin: 0;
  padding: 0;
}

/* ---------- Hero ---------- */
.hero {
  width: 100%;
  max-width: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: clamp(4px, 0.8vw, 12px) var(--pad) clamp(56px, 8vw, 96px);
}

.eyebrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  margin: 0 0 6px;
  font-size: 13px;
}

.eyebrow .en {
  font-weight: 700;
  color: var(--ink);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 12px;
}

.eyebrow .vi {
  font-weight: 400;
  color: var(--muted-2);
  font-style: italic;
  font-size: 12px;
}


/* ---------- Tôi Ăn Cơm trailer: shelf of swap modules ---------- */
.tac-stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  width: 100%;
}

.tac-library {
  position: relative;
  width: 100%;
  max-width: 1480px;
  height: 960px;
  perspective: 1800px;
  perspective-origin: 50% 50%;
}

/* Each card receives the following CSS custom properties from script.js,
   set per module from modules.js. No per-slot CSS rules — adding cards
   requires NO style edits.

   --accent       : per-card highlight color (becomes border + active word)
   --shelf-x      : px X offset on the shelf
   --shelf-y      : px Y offset
   --shelf-z      : px Z depth
   --shelf-roty   : deg Y rotation
   --shelf-rotz   : deg Z tilt
   --breathe-delay: animation-delay for the idle breathe pulse
*/

.tac-module {
  --accent: var(--ink);
  --shelf-x: 0px;
  --shelf-y: 0px;
  --shelf-z: 0px;
  --shelf-roty: 0deg;
  --shelf-rotz: 0deg;
  --breathe-delay: 0s;
  --shelf-z-index: 1;

  position: absolute;
  top: 50%;
  left: 50%;
  z-index: var(--shelf-z-index);
  width: 340px;
  height: 220px;
  padding: 22px 28px;
  background: #ffffff;

  /* RULE: restraint. Cards are sharp white slabs with subtle neutral
     elevation. The accent color appears ONLY on the swapped word
     itself (and as a single hairline accent on the active card's
     top edge). No colored glows, no halos, no shrines. Aim:
     Japanese / Swiss editorial — the page is mostly white space and
     typography. Don't reintroduce colored shadows. */
  border: none;
  border-radius: 2px;
  cursor: pointer;
  font-family: inherit;
  text-align: left;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transform-style: preserve-3d;
  transform-origin: 50% 50%;
  backface-visibility: hidden;
  will-change: transform;
  box-shadow:
    0 1px 2px rgba(0, 0, 0, 0.04),
    0 14px 36px -14px rgba(0, 0, 0, 0.10);
  transition:
    transform 720ms cubic-bezier(.2, .7, .2, 1),
    box-shadow 720ms cubic-bezier(.2, .7, .2, 1);

  transform:
    translate(-50%, -50%)
    translateX(var(--shelf-x))
    translateY(var(--shelf-y))
    translateZ(var(--shelf-z))
    rotateY(var(--shelf-roty))
    rotateZ(var(--shelf-rotz));
}

/* Hover on ring cards: push forward in Z, soften the inward tilt.
   X/Y stay locked to the ring position — lifting a top-edge card
   would push it off-stage, so we don't touch them. */
.tac-module:hover:not(.is-active) {
  transform:
    translate(-50%, -50%)
    translateX(var(--shelf-x))
    translateY(var(--shelf-y))
    translateZ(calc(var(--shelf-z) + 70px))
    rotateY(calc(var(--shelf-roty) * 0.55))
    rotateZ(var(--shelf-rotz));
}

/* Active state — pulled forward to the very center, larger, with a
   refined neutral elevation. A single 2px accent hairline runs
   along the very top edge as the only colored signature.
   Width is fluid: grows to fit long swap variants (e.g. the full
   "tôi ăn cơm chưa" ADDREM sentence) up to a capped max so the
   shelf behind it stays visible. */
.tac-module.is-active {
  width: auto;
  min-width: 660px;
  max-width: min(92vw, 960px);
  height: auto;
  min-height: 320px;
  padding: 36px 52px 32px;
  transform: translate(-50%, -50%) translateZ(220px) rotateY(0deg) rotateZ(0deg) scale(1.1) !important;
  z-index: 100;
  box-shadow:
    0 1px 2px rgba(0, 0, 0, 0.05),
    0 40px 100px -28px rgba(0, 0, 0, 0.18);
  cursor: pointer;
  gap: 16px;
}

.tac-module.is-active::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
}

/* When one card is active, the inactive ring cards stay SOLID (never
   transparent — text bleeding through is unreadable). They keep their
   ring position (X/Y) and just recede hard in Z so the active card
   clearly dominates the foreground without visually colliding with
   the surrounding frame. */
.tac-library.has-active .tac-module:not(.is-active) {
  transform:
    translate(-50%, -50%)
    translateX(var(--shelf-x))
    translateY(var(--shelf-y))
    translateZ(calc(var(--shelf-z) - 260px))
    rotateY(var(--shelf-roty))
    rotateZ(var(--shelf-rotz));
}

/* ----- Card content ----- */
.mod-head {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.mod-kind {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.24em;
  color: var(--muted-2);
  text-transform: uppercase;
}

.mod-target {
  font-size: 16px;
  font-weight: 800;
  color: var(--accent);
  font-style: italic;
}

/* Sentence layout is type-aware.
   - SWAP: 1fr | auto | 1fr grid — the active word stays pinned
     to the card's visual center because left and right contexts
     balance each other (rule: "swapped word always centered").
   - ADD:  flex row, the whole sentence centered as a unit inside
     .mod-word-active. The added particle can land anywhere in
     the sentence, sometimes as a pair (e.g. "có … đâu"), so a
     grid would force the particle off-center or cause overlap.
     Centering the sentence container avoids both. */
.mod-sentence {
  align-items: baseline;
  font-size: 28px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
  margin: 6px 0;
  perspective: 900px;
  width: 100%;
  min-width: 0;
}

.tac-module[data-type="swap"] .mod-sentence {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
}

.tac-module[data-type="add"] .mod-sentence {
  display: flex;
  justify-content: center;
  flex-wrap: nowrap;
}

.mod-side {
  color: var(--ink);
  white-space: nowrap;
  font-weight: 800;
  opacity: 0.75;
}

/* SWAP sides: right-align left · left-align right so the sentence
   reads continuously around the centered active word. */
.tac-module[data-type="swap"] .mod-left  { text-align: right; padding-right: 0.36em; }
.tac-module[data-type="swap"] .mod-right { text-align: left;  padding-left:  0.36em; }

/* ADD sides are always empty (content lives inside
   .mod-word-active as segment children). Collapse them so the
   sentence flex doesn't reserve phantom space. */
.tac-module[data-type="add"] .mod-side { display: none; }

.mod-word-active {
  color: var(--accent);
  display: inline-block;
  white-space: nowrap;
  text-align: center;
  transform-origin: 50% 50%;
  backface-visibility: hidden;
  will-change: transform, opacity;
}

/* ADD: .mod-word-active is a segment container. Segments sit in a
   row with a natural word gap and rotate together with the parent
   during flip. A seg-hit is accent-colored; a seg-mute is neutral
   context. Supporting multiple seg-hit spans in one item is how
   template pairs like "có ... đâu" highlight both halves at once. */
.tac-module[data-type="add"] .mod-word-active {
  display: inline-flex;
  align-items: baseline;
  flex-wrap: nowrap;
  gap: 0.3em;
  white-space: nowrap;
}

.tac-module[data-type="add"] .mod-word-active .seg-hit {
  color: var(--accent);
  font-weight: 800;
}

.tac-module[data-type="add"] .mod-word-active .seg-mute {
  color: var(--ink);
  opacity: 0.75;
  font-weight: 800;
}

@keyframes mod-flip-out {
  0%   { transform: rotateX(0deg);   opacity: 1; }
  100% { transform: rotateX(-90deg); opacity: 0; }
}
@keyframes mod-flip-in {
  0%   { transform: rotateX(90deg);  opacity: 0; }
  100% { transform: rotateX(0deg);   opacity: 1; }
}

.mod-word-active.flip-out {
  animation: mod-flip-out 350ms cubic-bezier(.6, .02, .4, 1) forwards;
}
.mod-word-active.flip-in {
  animation: mod-flip-in 350ms cubic-bezier(.6, .02, .4, 1) forwards;
}

.mod-foot {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 2px;
  text-align: center;
  width: 100%;
  min-width: 0;
}

.mod-foot-en,
.mod-foot-vi {
  display: block;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  overflow-wrap: break-word;
  word-break: break-word;
  hyphens: auto;
}

.mod-foot-en {
  font-size: 12px;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.35;
}

.mod-foot-vi {
  font-size: 11px;
  font-style: italic;
  color: var(--muted);
  line-height: 1.35;
}

/* ----- Active-state typographic boost ----- */
.tac-module.is-active .mod-target {
  font-size: 20px;
}

.tac-module.is-active .mod-sentence {
  font-size: clamp(36px, 5vw, 48px);
  margin: 12px 0;
}

.tac-module.is-active .mod-foot-en {
  font-size: 14px;
}

.tac-module.is-active .mod-foot-vi {
  font-size: 12px;
}

.mod-mode {
  display: none;
  margin-top: 8px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted-2);
}

.tac-module.is-active .mod-mode {
  display: inline;
}

/* ----- Close (×) button ----- */
.mod-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 28px;
  height: 28px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: #ffffff;
  font-family: inherit;
  font-size: 18px;
  line-height: 1;
  color: var(--muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 280ms ease, color 200ms ease, border-color 200ms ease, transform 200ms ease;
}

.tac-module.is-active .mod-close {
  opacity: 1;
  pointer-events: auto;
}

.mod-close:hover {
  color: var(--ink);
  border-color: var(--ink);
  transform: scale(1.08);
}

/* ----- Idle breath: a barely-perceptible elevation pulse ----- */
@keyframes tac-breathe {
  0%, 100% {
    box-shadow:
      0 1px 2px rgba(0, 0, 0, 0.04),
      0 14px 36px -14px rgba(0, 0, 0, 0.10);
  }
  50% {
    box-shadow:
      0 1px 2px rgba(0, 0, 0, 0.05),
      0 20px 48px -14px rgba(0, 0, 0, 0.14);
  }
}
.tac-library:not(.has-active) .tac-module {
  animation: tac-breathe 4.2s ease-in-out infinite;
  animation-delay: var(--breathe-delay);
}

.tac-hint {
  display: none;
  margin: 0;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  text-align: center;
}
.tac-hint .en {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}
.tac-hint .vi {
  font-size: 11px;
  font-style: italic;
  color: var(--muted-2);
}

/* tac-link: plain text link with a 1px underline — not a pill. */
.tac-link {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  padding: 4px 0;
  border-bottom: 1px solid var(--ink);
  font-size: 13px;
  font-weight: 700;
  transition: opacity var(--t-fast);
}

.tac-link .en {
  color: var(--ink);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.tac-link .vi {
  color: var(--muted);
  font-size: 11px;
  font-style: italic;
}

.tac-link:hover {
  opacity: 0.7;
}

/* ---------- Pillars ---------- */
/* Pillars: sharp white slabs divided by a 1px vertical rule,
   each titled with a thin top hairline. No rounded corners, no
   background tint, no lift on hover — the content does the work. */
.pillars {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--pad) clamp(72px, 10vw, 140px);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.pillar {
  position: relative;
  padding: clamp(40px, 5vw, 72px) clamp(28px, 4vw, 56px);
  background: #ffffff;
  border-radius: 0;
}

.pillar + .pillar {
  border-left: 1px solid var(--line);
}

.pillar h2 {
  display: flex;
  flex-direction: column;
  margin: 0 0 28px;
  line-height: 1.1;
}

.pillar h2 .en {
  font-weight: 800;
  font-size: clamp(26px, 2.6vw, 34px);
  letter-spacing: -0.02em;
  color: var(--ink);
}

.pillar h2 .vi {
  font-weight: 400;
  font-size: 13px;
  color: var(--muted);
  font-style: italic;
  margin-top: 6px;
}

.pillar-body {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-2);
  max-width: 48ch;
}

.pillar-body-vi {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
  font-style: italic;
  max-width: 52ch;
}

/* ---------- Genre / instrument emphasis ----------
   For Vietnamese musical genres and instruments (hát ru, vọng cổ,
   đàn tranh, hát xẩm, lý con sáo). Italic + bold + a marker-pen
   highlight underline. Color used here is intentional editorial
   punctuation, not a wash — only these named terms carry it. */
.dieu {
  font-style: italic;
  font-weight: 700;
  color: var(--ink);
  background: linear-gradient(
    180deg,
    transparent 0%,
    transparent 62%,
    rgba(232, 178, 56, 0.32) 62%,
    rgba(232, 178, 56, 0.32) 92%,
    transparent 92%
  );
  padding: 0 2px;
  border-radius: 1px;
}

.pillar-body-vi .dieu,
.pub-meta .dieu {
  font-weight: 600;
}

/* ---------- Publications ----------
   A long-form research list. Same Swiss/Japanese restraint as
   pillars: sharp white slabs, 1px hairline rules between items,
   year as a thin tag in the gutter, EN primary VI secondary.
   No rounded corners, no hover lift, no fill. */
.publications {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(64px, 8vw, 120px) var(--pad);
  border-bottom: 1px solid var(--line);
}

.publications-head {
  margin: 0 0 clamp(36px, 4vw, 56px);
  max-width: 64ch;
}

.publications-head h2 {
  display: flex;
  flex-direction: column;
  margin: 0 0 20px;
  line-height: 1.1;
}

.publications-head h2 .en {
  font-weight: 800;
  font-size: clamp(26px, 2.6vw, 34px);
  letter-spacing: -0.02em;
  color: var(--ink);
}

.publications-head h2 .vi {
  font-weight: 400;
  font-size: 13px;
  color: var(--muted);
  font-style: italic;
  margin-top: 6px;
}

.publications-intro {
  margin: 0 0 6px;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-2);
}

.publications-intro-vi {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
  font-style: italic;
}

.pub-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.pub-item {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: clamp(20px, 3vw, 40px);
  padding: clamp(20px, 2.4vw, 28px) 0;
  border-bottom: 1px solid var(--line);
}

.pub-year {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--muted);
  padding-top: 3px;
}

.pub-body {
  min-width: 0;
}

.pub-title {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink);
  margin-bottom: 6px;
  max-width: 72ch;
}

.pub-meta {
  font-size: 13px;
  font-style: italic;
  line-height: 1.5;
  color: var(--muted);
  max-width: 72ch;
}

/* ---------- Apps ----------
   Same Swiss/Japanese restraint as publications: sharp white slabs,
   1px hairline rules between items, two-digit index in the gutter,
   title as a plain text link with a 1px underline on hover. No
   pills, no fill, no halos. Coming-soon items are non-interactive
   and muted — same row, marked by .is-soon. */
.apps {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(64px, 8vw, 120px) var(--pad);
  border-bottom: 1px solid var(--line);
}

.apps-head {
  margin: 0 0 clamp(36px, 4vw, 56px);
  max-width: 64ch;
}

.apps-head h2 {
  display: flex;
  flex-direction: column;
  margin: 0 0 20px;
  line-height: 1.1;
}

.apps-head h2 .en {
  font-weight: 800;
  font-size: clamp(26px, 2.6vw, 34px);
  letter-spacing: -0.02em;
  color: var(--ink);
}

.apps-head h2 .vi {
  font-weight: 400;
  font-size: 13px;
  color: var(--muted);
  font-style: italic;
  margin-top: 6px;
}

.apps-intro {
  margin: 0 0 6px;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-2);
}

.apps-intro-vi {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
  font-style: italic;
}

.app-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.app-item {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: clamp(20px, 3vw, 40px);
  padding: clamp(20px, 2.4vw, 28px) 0;
  border-bottom: 1px solid var(--line);
}

.app-num {
  font-family: "Be Vietnam Pro", system-ui, sans-serif;
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--muted);
  padding-top: 4px;
}

.app-body {
  min-width: 0;
}

a.app-title,
span.app-title {
  display: inline;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
  border-bottom: 1px solid transparent;
  transition: border-color var(--t-fast), color var(--t-fast);
}

a.app-title:hover {
  border-bottom-color: var(--ink);
}

.app-meta {
  font-size: 13px;
  font-style: italic;
  line-height: 1.5;
  color: var(--muted);
  margin-top: 6px;
  max-width: 72ch;
}

.app-item.is-soon .app-title {
  color: var(--muted-2);
  font-weight: 600;
}

.app-item.is-soon .app-num {
  color: var(--muted-2);
}

/* ---------- Books page ----------
   Same Swiss/Japanese restraint as the rest of the site. Sharp slabs,
   thin hairlines, EN primary VI secondary. The flipbook preview is
   intentionally small — enough to feel the design, not enough to
   read cover to cover. No zoom, no right-click save, no drag.
   For the full book in clear print, order a copy. */
.topnav a.is-active {
  color: var(--ink);
}
.topnav a.is-active::after {
  transform: scaleX(1);
}

.books-hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(48px, 7vw, 96px) var(--pad) clamp(24px, 3vw, 40px);
  text-align: left;
}

.books-title {
  display: flex;
  flex-direction: column;
  margin: 12px 0 20px;
  line-height: 1.05;
}

.books-title .en {
  font-weight: 800;
  font-size: clamp(40px, 6vw, 72px);
  letter-spacing: -0.03em;
  color: var(--ink);
}

.books-title .vi {
  font-weight: 400;
  font-size: 14px;
  color: var(--muted);
  font-style: italic;
  margin-top: 8px;
}

.books-intro {
  max-width: 64ch;
  margin: 0 0 6px;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-2);
}

.books-intro-vi {
  max-width: 64ch;
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
  font-style: italic;
}

.books-section {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(32px, 5vw, 64px) var(--pad) clamp(64px, 8vw, 120px);
  border-top: 1px solid var(--line);
}

.book-entry {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: clamp(28px, 4vw, 64px);
  padding: clamp(36px, 5vw, 64px) 0;
  border-bottom: 1px solid var(--line);
  align-items: start;
}

.book-entry:last-child {
  border-bottom: none;
}

/* --- Preview column --- */
.book-preview {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  width: min(560px, 100%);
  flex-shrink: 0;
}

.flipbook {
  position: relative;
  width: min(560px, 100%);
  max-width: 100%;
  background: #fafafa;
  border: 1px solid var(--line);
  overflow: hidden;
  user-select: none;
  -webkit-user-select: none;
}

.flipbook-img {
  display: block;
  width: 100%;
  height: auto;
  pointer-events: none;
  -webkit-user-drag: none;
  user-select: none;
  -webkit-user-select: none;
}

/* Transparent overlay that sits on top of the image and absorbs
   right-clicks and drags. Controls live OUTSIDE .flipbook so the
   guard doesn't block them. */
.flipbook-guard {
  position: absolute;
  inset: 0;
  background: transparent;
  cursor: default;
}

.flip-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  font-variant-numeric: tabular-nums;
}

.flip-btn {
  width: 28px;
  height: 28px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink-2);
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  padding: 0;
  border-radius: var(--radius);
  transition: border-color var(--t-fast), color var(--t-fast);
}

.flip-btn:hover {
  border-color: var(--ink);
  color: var(--ink);
}

.flip-counter {
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  min-width: 56px;
  text-align: center;
  letter-spacing: 0.04em;
}

.flip-note {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  margin: 0;
  font-size: 11px;
  text-align: center;
}

.flip-note .en {
  color: var(--muted);
  letter-spacing: 0.04em;
}

.flip-note .vi {
  color: var(--muted-2);
  font-style: italic;
}

/* --- Info column --- */
.book-info {
  min-width: 0;
  max-width: 56ch;
}

.book-kind {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.book-kind .en {
  font-weight: 700;
  color: var(--ink-2);
}

.book-kind .vi {
  font-weight: 400;
  color: var(--muted);
  font-style: italic;
  text-transform: none;
  letter-spacing: 0.02em;
}

.book-title {
  margin: 0 0 8px;
  font-size: clamp(22px, 2.4vw, 30px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--ink);
}

.book-authors {
  margin: 0 0 18px;
  font-size: 14px;
  font-style: italic;
  color: var(--muted);
}

.book-body {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.65;
  color: var(--ink-2);
}

.book-body-vi {
  margin: 0 0 24px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
  font-style: italic;
}

.book-buy {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  padding: 10px 18px;
  border: 1px solid var(--ink);
  background: #fff;
  color: var(--ink);
  border-radius: var(--radius);
  transition: background var(--t-fast), color var(--t-fast);
}

.book-buy .en {
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.04em;
}

.book-buy .vi {
  font-size: 11px;
  font-style: italic;
  color: var(--muted);
  transition: color var(--t-fast);
}

.book-buy:hover {
  background: var(--ink);
  color: #fff;
}

.book-buy:hover .vi {
  color: var(--muted-2);
}

@media (max-width: 760px) {
  .book-entry {
    grid-template-columns: 1fr;
    justify-items: center;
    gap: 28px;
  }

  .book-info {
    text-align: left;
  }
}

/* ---------- Team page ---------- */
.team-hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(48px, 7vw, 96px) var(--pad) clamp(24px, 3vw, 40px);
  text-align: left;
}

.team-title {
  display: flex;
  flex-direction: column;
  margin: 12px 0 20px;
  line-height: 1.05;
}

.team-title .en {
  font-weight: 800;
  font-size: clamp(40px, 6vw, 72px);
  letter-spacing: -0.03em;
  color: var(--ink);
}

.team-title .vi {
  font-weight: 400;
  font-size: 14px;
  color: var(--muted);
  font-style: italic;
  margin-top: 8px;
}

.team-intro {
  max-width: 64ch;
  margin: 0 0 6px;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-2);
}

.team-intro-vi {
  max-width: 64ch;
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
  font-style: italic;
}

/* Roster: full-bleed alternating rows. The <main> has no
   max-width, so rows span the whole viewport edge to edge.
   Each row is a 50/50 grid; the image column sits flush to
   the outside edge (no padding), the text column carries
   the inside padding. */
.team-roster {
  border-top: 1px solid var(--line);
}

.team-row {
  display: grid;
  grid-template-columns: clamp(240px, 28vw, 360px) 1fr;
  align-items: center;
  gap: clamp(28px, 4vw, 72px);
  padding: clamp(48px, 6vw, 96px) var(--pad);
  border-bottom: 1px solid var(--line);
}

.team-row:last-child {
  border-bottom: none;
}

.team-row[data-side="right"] {
  grid-template-columns: 1fr clamp(240px, 28vw, 360px);
}

.team-row[data-side="right"] .team-photo {
  order: 2;
}

.team-row[data-side="right"] .team-info {
  order: 1;
}

.team-photo {
  background: #fafafa;
}

.team-photo img {
  display: block;
  width: 100%;
  height: auto;
  pointer-events: none;
  -webkit-user-drag: none;
  user-select: none;
  -webkit-user-select: none;
}

.team-info {
  display: flex;
  flex-direction: column;
  justify-content: center;
  max-width: 64ch;
}

.team-kind {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.team-kind .en {
  font-weight: 700;
  color: var(--ink-2);
}

.team-kind .vi {
  font-weight: 400;
  color: var(--muted);
  font-style: italic;
  text-transform: none;
  letter-spacing: 0.02em;
}

.team-name {
  margin: 0 0 6px;
  font-size: clamp(26px, 3vw, 38px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--ink);
}

.team-roles {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin: 0 0 20px;
  font-size: 13px;
}

.team-roles .en {
  color: var(--ink-2);
  font-weight: 600;
}

.team-roles .vi {
  color: var(--muted);
  font-style: italic;
}

.team-body {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.65;
  color: var(--ink-2);
}

.team-body-vi {
  margin: 0 0 24px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
  font-style: italic;
}

.team-link {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  padding: 10px 18px;
  border: 1px solid var(--ink);
  background: #fff;
  color: var(--ink);
  border-radius: var(--radius);
  align-self: flex-start;
  transition: background var(--t-fast), color var(--t-fast);
}

.team-link .en {
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.04em;
}

.team-link .vi {
  font-size: 11px;
  font-style: italic;
  color: var(--muted);
  transition: color var(--t-fast);
}

.team-link:hover {
  background: var(--ink);
  color: #fff;
}

.team-link:hover .vi {
  color: var(--muted-2);
}

@media (max-width: 820px) {
  .team-row,
  .team-row[data-side="right"] {
    grid-template-columns: 1fr;
    justify-items: start;
    gap: 24px;
  }

  .team-row[data-side="right"] .team-photo,
  .team-row[data-side="right"] .team-info {
    order: initial;
  }

  .team-photo {
    width: min(320px, 80%);
  }

  .team-info {
    max-width: none;
  }
}

/* ---------- Contact ---------- */
.contact {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(64px, 8vw, 120px) var(--pad);
  border-bottom: 1px solid var(--line);
}

.contact-head {
  margin: 0 0 clamp(36px, 4vw, 56px);
  max-width: 64ch;
}

.contact-head h2 {
  display: flex;
  flex-direction: column;
  margin: 0;
  line-height: 1.1;
}

.contact-head h2 .en {
  font-weight: 800;
  font-size: clamp(26px, 2.6vw, 34px);
  letter-spacing: -0.02em;
  color: var(--ink);
}

.contact-head h2 .vi {
  font-weight: 400;
  font-size: 13px;
  color: var(--muted);
  font-style: italic;
  margin-top: 6px;
}

.contact-list {
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.contact-row {
  display: grid;
  grid-template-columns: minmax(120px, 180px) 1fr;
  gap: 32px;
  padding: 24px 0;
  border-top: 1px solid var(--line);
}

.contact-row:last-child {
  border-bottom: 1px solid var(--line);
}

.contact-label {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.contact-label .en {
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
}

.contact-label .vi {
  font-weight: 400;
  font-size: 12px;
  color: var(--muted);
  font-style: italic;
}

.contact-value {
  margin: 0;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-2);
}

.contact-value a {
  position: relative;
  color: var(--ink);
  font-weight: 600;
}

.contact-value a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 1px;
  background: var(--ink);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--t-fast);
}

.contact-value a:hover::after {
  transform: scaleX(1);
}

@media (max-width: 640px) {
  .contact-row {
    grid-template-columns: 1fr;
    gap: 10px;
  }
}

/* ============================================================
   Repertoire — index grid + per-piece subpages + lightbox
   Full-bleed tablature, lazy YouTube facades, mobile pinch-zoom
   ============================================================ */

/* ---------- Shared: hero ---------- */
.rep-hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(36px, 5vw, 72px) var(--pad) clamp(24px, 3vw, 40px);
}

.rep-back {
  display: inline-block;
  margin-bottom: clamp(20px, 3vw, 36px);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast);
}
.rep-back:hover { color: var(--ink); border-bottom-color: var(--ink); }

.rep-eyebrow {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.rep-eyebrow .en { font-weight: 700; color: var(--ink-2); }
.rep-eyebrow .vi { font-weight: 400; color: var(--muted); font-style: italic; text-transform: none; letter-spacing: 0.02em; }

.rep-title {
  display: flex;
  flex-direction: column;
  margin: 0 0 clamp(20px, 3vw, 32px);
  line-height: 1.02;
}
.rep-title .vi-big {
  font-weight: 800;
  font-size: clamp(36px, 6vw, 72px);
  letter-spacing: -0.03em;
  color: var(--ink);
}
.rep-title .en-small {
  margin-top: 10px;
  font-weight: 400;
  font-size: clamp(14px, 1.4vw, 17px);
  color: var(--muted);
  font-style: italic;
}

.rep-blurb {
  max-width: 62ch;
  margin: 0 0 6px;
  font-size: 16px;
  line-height: 1.65;
  color: var(--ink-2);
}
.rep-blurb-vi {
  max-width: 62ch;
  margin: 0 0 clamp(24px, 3vw, 40px);
  font-size: 14px;
  line-height: 1.65;
  color: var(--muted);
  font-style: italic;
}

.rep-terms {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 4px 28px;
  margin: 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--line);
  max-width: 880px;
}
.rep-terms dt {
  font-weight: 700;
  font-size: 14px;
  color: var(--ink);
}
.rep-terms dd {
  margin: 0 0 10px;
  font-size: 13px;
  color: var(--muted);
  font-style: italic;
}

/* ---------- Shared: tablature image + sections ---------- */
.rep-overview,
.rep-level,
.rep-performance {
  padding: clamp(28px, 4vw, 56px) 0 clamp(12px, 2vw, 24px);
  border-top: 1px solid var(--line);
}

.rep-level-title {
  max-width: var(--max);
  margin: 0 auto clamp(16px, 2vw, 24px);
  padding: 0 var(--pad);
  font-size: clamp(13px, 1.4vw, 15px);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}
.rep-level-title .n { color: var(--ink); }

.rep-tab-btn {
  display: block;
  width: 100%;
  padding: 0;
  margin: 0;
  border: none;
  background: transparent;
  cursor: zoom-in;
}
.rep-tab {
  display: block;
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  height: auto;
  /* Tablature images are wide and thin; let them breathe */
  background: #fafafa;
}

.rep-caption {
  max-width: var(--max);
  margin: clamp(14px, 2vw, 22px) auto clamp(16px, 2vw, 24px);
  padding: 0 var(--pad);
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.rep-caption .en {
  font-size: 14px;
  color: var(--ink-2);
  line-height: 1.55;
}
.rep-caption .vi {
  font-size: 12px;
  color: var(--muted);
  font-style: italic;
  line-height: 1.55;
}

/* ---------- Video strip: signal | video | signal | video | ... ---------- */
/* Free horizontal scroll, thin scrollbar, no arrow controls. Pattern
   borrowed from anhthuphan.com/media.html band-track: each video is
   preceded by a small signal slot that marks which phrase comes next. */
.rep-strip-wrap {
  /* Full-bleed: the strip extends past the page max-width to hint at
     more content off-screen. Scrollbar belongs to this wrapper. */
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: thin;
  scrollbar-color: var(--muted-2) transparent;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 10px;
}
.rep-strip-wrap::-webkit-scrollbar {
  height: 6px;
}
.rep-strip-wrap::-webkit-scrollbar-track {
  background: transparent;
}
.rep-strip-wrap::-webkit-scrollbar-thumb {
  background: var(--muted-2);
  border-radius: 3px;
}

.rep-strip {
  display: flex;
  align-items: stretch;
  gap: 12px;
  width: max-content;
  padding: 0 var(--pad);
}

/* All slots share the same height so video + signal line up cleanly. */
.rep-slot {
  --slot-h: clamp(180px, 22vw, 240px);
  flex-shrink: 0;
  height: var(--slot-h);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
}

.rep-slot-video {
  /* 16:9 width derived from height so video face fits exactly */
  width: calc(var(--slot-h) * 16 / 9);
}
.rep-slot-video .yt-facade {
  width: 100%;
  height: 100%;
  aspect-ratio: unset;
  border: none;
  border-radius: 0;
}
.rep-slot-video .yt-iframe {
  width: 100%;
  height: 100%;
}

/* Signal slot — the "nhỏ thôi" block before each video */
.rep-slot-signal {
  width: clamp(72px, 9vw, 96px);
  padding: 14px 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background: #fafafa;
  text-align: center;
}
.rep-sig-mark {
  font-size: 8px;
  line-height: 1;
  color: var(--muted-2);
  margin-bottom: 2px;
}
.rep-sig-head {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}
.rep-sig-num {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: clamp(14px, 1.4vw, 17px);
  font-weight: 700;
  color: var(--ink);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

/* Alias slot — "same as Phrase 1" placeholder */
.rep-slot-alias {
  width: calc(var(--slot-h) * 16 / 9);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  border-style: dashed;
  background: #fafafa;
}
.rep-slot-alias span {
  font-size: 12px;
  color: var(--muted);
  font-style: italic;
  text-align: center;
  line-height: 1.5;
}

/* ---------- YouTube facade (thumbnail + play, iframe on click) ---------- */
.yt-facade {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
}
.yt-thumb {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.88;
  transition: opacity var(--t-fast);
}
.yt-facade:hover .yt-thumb { opacity: 1; }
.yt-play {
  position: absolute;
  left: 50%; top: 50%;
  transform: translate(-50%, -50%);
  width: 56px; height: 56px;
  border: none;
  background: rgba(0, 0, 0, 0.72);
  color: #fff;
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  border-radius: var(--radius);
  transition: background var(--t-fast), transform var(--t-fast);
}
.yt-facade:hover .yt-play {
  background: rgba(0, 0, 0, 0.88);
  transform: translate(-50%, -50%) scale(1.04);
}
.yt-iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}

.rep-performance .yt-facade {
  max-width: min(920px, 100%);
  margin: 0 auto;
}

/* Overview block — image + caption + video stacked */
.rep-overview .yt-facade {
  max-width: min(920px, 100%);
  margin: clamp(8px, 1.2vw, 16px) auto 0;
  margin-left: auto;
  margin-right: auto;
  display: block;
}
.rep-overview .yt-facade,
.rep-overview .rep-caption {
  /* cage the overview video under max-width so it doesn't span wider than readable */
}

/* ---------- Lightbox ---------- */
/* Three ways to exit: × button, tap image (1 finger), tap backdrop, Esc.
   Pinch is two-finger so it zooms without triggering close. The top bar
   is pinned to viewport so the × stays reachable at any zoom level. */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(10, 10, 10, 0.96);
  display: none;
  opacity: 0;
  transition: opacity var(--t-fast);
}
.lightbox.is-open {
  display: block;
  opacity: 1;
}

.lightbox-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: max(12px, env(safe-area-inset-top)) max(16px, env(safe-area-inset-right)) 12px max(16px, env(safe-area-inset-left));
  background: linear-gradient(to bottom, rgba(0,0,0,0.75), rgba(0,0,0,0));
  pointer-events: none;
}
.lightbox-bar > * { pointer-events: auto; }

.lightbox-hint {
  display: flex;
  flex-direction: column;
  gap: 1px;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.75);
  max-width: calc(100% - 68px);
}
.lightbox-hint .en {
  font-weight: 600;
  text-transform: uppercase;
  color: #fff;
}
.lightbox-hint .vi {
  font-style: italic;
  color: rgba(255, 255, 255, 0.6);
  font-size: 10px;
}

.lightbox-close {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border: 1px solid rgba(255, 255, 255, 0.4);
  background: rgba(0, 0, 0, 0.55);
  color: #fff;
  font-size: 26px;
  line-height: 1;
  cursor: pointer;
  border-radius: var(--radius);
  font-family: inherit;
}
.lightbox-close:hover {
  border-color: #fff;
  background: rgba(0, 0, 0, 0.85);
}

.lightbox-scroll {
  position: absolute;
  inset: 0;
  overflow: auto;
  touch-action: pinch-zoom;
  -webkit-overflow-scrolling: touch;
}
.lightbox-img {
  display: block;
  min-width: 100%;
  min-height: 100%;
  max-width: none;
  height: auto;
  margin: auto;
  cursor: zoom-out;
}
body.lightbox-open {
  overflow: hidden;
}

/* ---------- Repertoire index grid ---------- */
.rep-index {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--pad) clamp(64px, 8vw, 120px);
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: clamp(24px, 3vw, 40px);
}

.rep-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  color: var(--ink);
  transition: transform var(--t-fast);
}
.rep-card:hover { transform: translateY(-2px); }

.rep-card-img-wrap {
  width: 100%;
  aspect-ratio: 1 / 1;
  background: #fafafa;
  border: 1px solid var(--line);
  overflow: hidden;
}
.rep-card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform var(--t-med);
}
.rep-card:hover .rep-card-img { transform: scale(1.02); }

.rep-card-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.rep-card-vi {
  font-weight: 700;
  font-size: 16px;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.rep-card-en {
  font-weight: 400;
  font-size: 13px;
  font-style: italic;
  color: var(--muted);
}

/* ---------- Basics subpage article ---------- */
/* Basics pages are traditional articles — heading, paragraph, image,
   video interleaved. Share hero typography with .rep-hero. */
.basics-article {
  max-width: 760px;
  margin: 0 auto;
  padding: clamp(28px, 4vw, 56px) var(--pad) clamp(64px, 8vw, 120px);
  border-top: 1px solid var(--line);
}

.basics-h2 {
  margin: clamp(36px, 5vw, 64px) 0 18px;
  font-size: clamp(22px, 2.4vw, 30px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--ink);
}
.basics-h2:first-child { margin-top: 0; }

.basics-h3 {
  margin: clamp(28px, 4vw, 44px) 0 12px;
  font-size: clamp(16px, 1.6vw, 19px);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.3;
  color: var(--ink);
}

.basics-h4 {
  margin: 24px 0 8px;
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.basics-p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink-2);
}

/* Images in the article are click-to-zoom, full-column width */
.basics-img-btn {
  display: block;
  width: 100%;
  padding: 0;
  margin: clamp(18px, 2.6vw, 28px) 0;
  border: none;
  background: transparent;
  cursor: zoom-in;
}
.basics-img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fafafa;
}

/* Video wrapper — 16:9 facade sized to article column width */
.basics-video {
  margin: clamp(18px, 2.6vw, 28px) 0;
}
.basics-video .yt-facade {
  width: 100%;
  aspect-ratio: 16 / 9;
}

/* Mobile polish */
@media (max-width: 760px) {
  .rep-terms {
    grid-template-columns: 1fr;
  }
  .lightbox-hint .vi { display: none; }
}

/* ---------- Footer ---------- */
.footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 32px var(--pad) 48px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 12px;
  color: var(--muted);
}

.footer .en {
  font-weight: 600;
  color: var(--ink-2);
}

.footer .vi {
  font-style: italic;
  color: var(--muted-2);
}

/* ---------- Courses page ----------
   Two parallel tracks (đàn tranh + đàn bầu) share one schedule.
   The only color on the page comes from the two instrument
   accents, mirroring the tones used on the printed flyer. */
:root {
  --tranh: #246b78;   /* cool teal — đàn tranh zither */
  --bau:   #9b3f26;   /* warm ochre-red — đàn bầu monochord */
}

.dieu-tranh,
.dieu-bau {
  font-style: italic;
  font-weight: 700;
}
.dieu-tranh { color: var(--tranh); }
.dieu-bau   { color: var(--bau); }

.courses-hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(48px, 7vw, 96px) var(--pad) clamp(24px, 3vw, 40px);
  text-align: left;
}

.courses-title {
  display: flex;
  flex-direction: column;
  margin: 12px 0 20px;
  line-height: 1.05;
}

.courses-title .en {
  font-weight: 800;
  font-size: clamp(40px, 6vw, 72px);
  letter-spacing: -0.03em;
  color: var(--ink);
}

.courses-title .vi {
  font-weight: 400;
  font-size: 14px;
  color: var(--muted);
  font-style: italic;
  margin-top: 8px;
}

.courses-intro {
  max-width: 64ch;
  margin: 0 0 6px;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-2);
}

.courses-intro-vi {
  max-width: 64ch;
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
  font-style: italic;
}

.course-entry {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(32px, 5vw, 64px) var(--pad) clamp(32px, 5vw, 64px);
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: minmax(280px, 420px) 1fr;
  gap: clamp(28px, 4vw, 64px);
  align-items: start;
}

.course-flyer {
  width: 100%;
  max-width: 420px;
}

.course-flyer-img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  user-select: none;
  -webkit-user-drag: none;
  -webkit-user-select: none;
}

.course-info {
  min-width: 0;
  max-width: 64ch;
}

.course-kind {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.course-kind .en {
  font-weight: 700;
  color: var(--ink-2);
}

.course-kind .vi {
  font-weight: 400;
  color: var(--muted);
  font-style: italic;
  text-transform: none;
  letter-spacing: 0.02em;
}

.course-title {
  margin: 0 0 4px;
  font-size: clamp(28px, 3.2vw, 44px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.15;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35em;
  align-items: baseline;
}

.course-title .course-amp {
  color: var(--muted-2);
  font-weight: 300;
  font-style: normal;
}

.course-sub {
  margin: 0 0 20px;
  font-size: 13px;
  font-style: italic;
  color: var(--muted);
}

.course-blurb {
  font-size: 15px;
  line-height: 1.65;
  color: var(--ink-2);
  margin-bottom: 24px;
}

.course-blurb p {
  margin: 0 0 12px;
}

.course-blurb p:last-child {
  margin-bottom: 0;
}

.course-blurb h1,
.course-blurb h2,
.course-blurb h3 {
  font-size: 15px;
  font-weight: 800;
  margin: 16px 0 6px;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.course-blurb ul,
.course-blurb ol {
  margin: 0 0 12px;
  padding-left: 1.2em;
}

.course-blurb li {
  margin: 0 0 4px;
}

.course-blurb a {
  color: var(--tranh);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.course-blurb strong {
  font-weight: 700;
  color: var(--ink);
}

.course-blurb em {
  font-style: italic;
}

.course-loading {
  color: var(--muted-2);
  font-style: italic;
}

.course-meta {
  margin: 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 14px;
  font-size: 13px;
}

.course-meta > div {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 16px;
  align-items: start;
}

.course-meta dt {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 1px;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.course-meta dt .en {
  font-weight: 700;
  color: var(--ink-2);
}

.course-meta dt .vi {
  font-weight: 400;
  color: var(--muted);
  font-style: italic;
  text-transform: none;
  letter-spacing: 0.02em;
}

.course-meta dd {
  margin: 0;
  color: var(--ink-2);
  line-height: 1.6;
}

.dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 6px;
  vertical-align: 0;
  border-radius: 50%;
}

.dot-tranh { background: var(--tranh); }
.dot-bau   { background: var(--bau); }

.course-schedule-section {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(40px, 6vw, 80px) var(--pad) clamp(64px, 8vw, 120px);
  border-top: 1px solid var(--line);
}

.schedule-head {
  margin-bottom: 28px;
}

.schedule-title {
  display: flex;
  flex-direction: column;
  margin: 0 0 12px;
  line-height: 1.05;
}

.schedule-title .en {
  font-weight: 800;
  font-size: clamp(28px, 3.6vw, 44px);
  letter-spacing: -0.02em;
  color: var(--ink);
}

.schedule-title .vi {
  font-weight: 400;
  font-size: 13px;
  color: var(--muted);
  font-style: italic;
  margin-top: 6px;
}

.schedule-note {
  margin: 0 0 2px;
  font-size: 14px;
  color: var(--ink-2);
  max-width: 64ch;
}

.schedule-note-vi {
  margin: 0 0 18px;
  font-size: 13px;
  color: var(--muted);
  font-style: italic;
  max-width: 64ch;
}

.schedule-gate {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fafafa;
  max-width: 560px;
}

.schedule-gate-label {
  display: flex;
  flex-direction: column;
  gap: 1px;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-2);
  font-weight: 700;
}

.schedule-gate-label .vi {
  font-weight: 400;
  color: var(--muted);
  font-style: italic;
  text-transform: none;
  letter-spacing: 0.02em;
}

.schedule-gate-input {
  flex: 1 1 140px;
  min-width: 120px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  background: #fff;
  font: inherit;
  font-size: 14px;
  border-radius: var(--radius);
  letter-spacing: 0.08em;
}

.schedule-gate-input:focus {
  outline: none;
  border-color: var(--ink);
}

.schedule-gate-btn {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0;
  padding: 8px 16px;
  border: 1px solid var(--ink);
  background: #fff;
  color: var(--ink);
  cursor: pointer;
  border-radius: var(--radius);
  font: inherit;
  transition: background var(--t-fast), color var(--t-fast);
}

.schedule-gate-btn .en {
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.06em;
}

.schedule-gate-btn .vi {
  font-size: 10px;
  font-style: italic;
  color: var(--muted);
}

.schedule-gate-btn:hover {
  background: var(--ink);
  color: #fff;
}

.schedule-gate-btn:hover .vi {
  color: var(--muted-2);
}

.schedule-gate-status {
  font-size: 12px;
  color: var(--muted);
  font-style: italic;
}

.schedule-gate-status[data-kind="ok"]  { color: var(--tranh); font-style: normal; }
.schedule-gate-status[data-kind="err"] { color: var(--bau);   font-style: normal; }

.schedule-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

/* One entry per session. A session is a single unit of
   content taught twice — once on sunday and once on thursday.
   Inside each block, two instrument rows (đàn tranh, đàn bầu)
   each show their topic and two video slots, one per day. */
.session-block {
  list-style: none;
  padding: 24px 0 28px;
  border-bottom: 1px solid var(--line);
}

.session-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 14px 24px;
  margin-bottom: 16px;
}

.session-num {
  font-weight: 800;
  font-size: 22px;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-transform: lowercase;
}

.session-dates {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  color: var(--ink-2);
}

.session-date {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
}

.session-day {
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.session-date-sep {
  color: var(--muted-2);
}

.session-instruments {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.instrument-row {
  display: grid;
  grid-template-columns: minmax(260px, 1.1fr) minmax(0, 1.2fr) auto;
  gap: 20px;
  padding: 12px 0 12px 14px;
  align-items: start;
  position: relative;
}

.instrument-row::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 12px;
  width: 2px;
  background: var(--accent, var(--line));
}

.instrument-row.inst-dan-tranh { --accent: var(--tranh); }
.instrument-row.inst-dan-bau   { --accent: var(--bau); }

.instrument-head {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.instrument-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  margin-bottom: 2px;
}

.instrument-name {
  font-style: italic;
  font-weight: 700;
  color: var(--accent);
  font-size: 16px;
}

.instrument-times {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 10px;
  font-size: 11px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.instrument-time {
  display: inline-flex;
  align-items: baseline;
  gap: 5px;
}

.instrument-day {
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted-2);
}

.instrument-time-sep {
  color: var(--muted-2);
}

.instrument-topic {
  font-size: 14px;
  color: var(--ink-2);
  line-height: 1.5;
  padding-top: 2px;
}

.instrument-videos {
  display: flex;
  flex-direction: column;
  gap: 6px;
  justify-self: end;
}

.video-slot {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  min-width: 132px;
  justify-content: space-between;
  text-decoration: none;
  transition:
    background var(--t-fast),
    color var(--t-fast),
    border-color var(--t-fast);
}

.video-slot .video-day {
  font-weight: 700;
  color: var(--ink-2);
  font-size: 9px;
  letter-spacing: 0.14em;
}

.video-slot.is-pending {
  border-style: dashed;
  color: var(--muted-2);
}

.video-slot.is-pending .video-day {
  color: var(--muted-2);
}

.video-slot.is-locked {
  border-color: var(--line);
  color: var(--muted);
}

.video-slot.is-unlocked {
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 700;
}

.video-slot.is-unlocked .video-day {
  color: var(--accent);
}

.video-slot.is-unlocked:hover {
  background: var(--accent);
  color: #fff;
}

.video-slot.is-unlocked:hover .video-day {
  color: #fff;
}

.schedule-loading,
.schedule-empty {
  padding: 24px 0;
  color: var(--muted-2);
  font-style: italic;
  list-style: none;
}

/* ---------- Responsive ---------- */
/* ---------- Trailer: tablet/phone carousel ----------
   Desktop's rectangular 3D ring is a widescreen-only paradigm.
   Below 1024px we swap to a horizontal scroll-snap carousel:
   native touch momentum, per-card snap, every card visible at
   small size, user swipes. Every 3D/perspective rule is killed
   via !important because JS still sets shelf CSS vars inline —
   CSS needs to win to flatten the stage.

   The flip animation (rotate .mod-word-active) still works
   because that's internal to the card, independent of the
   card's own 3D transform. */
@media (max-width: 1024px) {
  .tac-stage {
    align-items: stretch;
  }

  .tac-library {
    /* flatten the 3D stage */
    perspective: none;
    max-width: 100%;
    height: auto;
    min-height: 0;

    /* horizontal scroll-snap row */
    display: flex;
    flex-direction: row;
    gap: 14px;
    padding: 24px 20px 32px;
    overflow-x: auto;
    overflow-y: hidden;
    scroll-snap-type: x mandatory;
    scroll-padding-inline: 20px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .tac-library::-webkit-scrollbar {
    display: none;
  }

  .tac-module {
    /* flow item, not absolute-positioned 3D object */
    position: relative !important;
    top: auto !important;
    left: auto !important;
    transform: none !important;
    transform-style: flat !important;

    width: 300px !important;
    min-width: 300px !important;
    max-width: 300px !important;
    height: auto !important;
    min-height: 220px !important;
    flex: 0 0 auto;

    scroll-snap-align: center;
    animation: none !important;
  }

  /* Trackpad tablets still fire hover — kill the desktop 3D
     hover transform so it doesn't jolt the carousel row. */
  .tac-module:hover:not(.is-active) {
    transform: none !important;
  }

  /* Active state: no 3D pull, no size grow, no forced width.
     The card already carries its accent hairline via ::before,
     which is enough of a signal. The user is looking directly
     at whichever card they tapped. */
  .tac-module.is-active {
    width: 300px !important;
    min-width: 300px !important;
    max-width: 300px !important;
    padding: 22px 24px !important;
    transform: none !important;
    z-index: 2;
  }

  /* Inactive cards while one is active: stay put in the row.
     The eye tracks via horizontal position, not Z-depth. */
  .tac-library.has-active .tac-module:not(.is-active) {
    transform: none !important;
  }

  /* Kill the idle breathe animation — battery + perceptual
     noise on small screens. */
  .tac-library:not(.has-active) .tac-module {
    animation: none !important;
  }
}

/* ---------- Trailer: phone-specific carousel sizing ----------
   Under 640px, shrink cards to 78% viewport so the edge of the
   next card peeks in — the peek is what tells the user "swipe".
   Without it the card looks static. */
@media (max-width: 640px) {
  .tac-module,
  .tac-module.is-active {
    width: 78vw !important;
    min-width: 78vw !important;
    max-width: 78vw !important;
  }

  .tac-library {
    padding: 18px 12px 28px;
    gap: 10px;
    scroll-padding-inline: 12px;
  }
}

@media (max-width: 720px) {
  .topbar {
    grid-template-columns: auto auto;
    grid-template-rows: auto auto;
    row-gap: 12px;
  }

  .topnav {
    grid-column: 1 / -1;
    justify-self: start;
    flex-wrap: wrap;
    gap: 0;
  }

  .topnav a:first-child { margin-left: 0; }

  .brand-vi { font-size: 13px; }
  .brand-en { font-size: 11px; }

  .pillars {
    grid-template-columns: 1fr;
  }

  .pillar + .pillar {
    border-left: none;
    border-top: 1px solid var(--line);
  }

  .pub-item {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .pub-year {
    padding-top: 0;
  }

  .app-item {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .app-num {
    padding-top: 0;
  }

  .course-entry {
    grid-template-columns: 1fr;
  }

  .course-flyer {
    max-width: 100%;
  }

  .instrument-row {
    grid-template-columns: 1fr;
    gap: 10px;
    padding-left: 12px;
  }

  .instrument-videos {
    justify-self: start;
    flex-direction: row;
    flex-wrap: wrap;
  }

  .session-header {
    gap: 8px 18px;
  }

  .session-num {
    font-size: 18px;
  }
}

/* ============================================================
   Photos — editorial vertical stream
   Single centered column, large imagery, minimal chrome.
   Full-bleed background is plain white; the only color cues
   are a hairline rule above each caption and the numeric index.
   ============================================================ */

.photos-hero {
  max-width: 760px;
  margin: 0 auto;
  padding: clamp(56px, 9vw, 120px) var(--pad) clamp(48px, 7vw, 88px);
  text-align: center;
}

.photos-title {
  margin: 10px 0 28px;
  font-size: clamp(44px, 7vw, 88px);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -0.025em;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.photos-title .en { color: var(--ink); }
.photos-title .vi {
  font-weight: 400;
  font-style: italic;
  font-size: 0.42em;
  color: var(--muted);
  letter-spacing: 0;
}

.photos-intro,
.photos-intro-vi {
  max-width: 56ch;
  margin: 0 auto 10px;
  color: var(--ink-2);
  font-size: 16px;
  line-height: 1.65;
}

.photos-intro-vi {
  font-style: italic;
  color: var(--muted);
}

/* ---------- Photos: horizontal accordion ----------
   A wide rack that scrolls horizontally. Each item is a vertical
   column: compressed items are thin 44px slivers, the active item
   expands into a tall portrait-friendly column. object-fit: contain
   on the active image guarantees portraits AND landscapes both show
   in full with no crop — that was the whole reason for flipping
   from vertical accordion. The rack itself scrolls horizontally;
   the vertical page scroll (hero → rack → footer) is unchanged. */

.photos-accordion {
  --header-h: 84px;
  /* Collapsed sliver width — JS reads this via getComputedStyle
     to stay in sync with CSS breakpoints (36px on mobile). */
  --item-w: 44px;
  margin: 0;
  padding: 0;
  max-width: none;
  width: 100%;
  height: calc(100vh - var(--header-h));
  overflow: hidden;
  background: #0a0a0a;
  position: relative;
}

/* Inner track — JS translates this horizontally so the active
   item sits at the viewport center. Using transform instead of
   scrollLeft means no boundary clamping — items at the start or
   end of the row center the same way as items in the middle. */
.photos-track {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  display: flex;
  flex-direction: row;
  gap: 2px;
  height: 100%;
  will-change: transform;
  transition: transform 900ms cubic-bezier(.72, 0, .12, 1);
}

.pa-item {
  position: relative;
  margin: 0;
  flex: 0 0 auto;
  width: var(--item-w, 44px);
  height: 100%;
  overflow: hidden;
  background: #0a0a0a;
  cursor: pointer;
  outline: none;
  transition: width 900ms cubic-bezier(.72, 0, .12, 1);
  will-change: width;
}

.pa-item:focus-visible {
  box-shadow: inset 0 0 0 2px #fff;
}

.pa-item.is-active {
  /* Width follows the photo's NATIVE aspect × rack height, so the
     expanded column is exactly the photo's own shape — no black
     bars on the sides, no cropping. JS writes --aspect
     (naturalWidth / naturalHeight) on image load; the fallback
     0.67 is a portrait guess used for the split second before the
     image arrives. Capped at 98vw so very wide panoramas still
     fit the viewport (those accept a small top/bottom crop from
     object-fit: cover). */
  width: min(calc(var(--aspect, 0.67) * (100vh - var(--header-h))), 98vw);
}

.pa-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  /* cover everywhere — on compressed slivers it shows a center slice,
     and on the active column the container already matches the photo's
     aspect, so cover renders the full frame with no visible crop. */
  object-fit: cover;
  object-position: center;
  display: block;
  transform-origin: 50% 50%;
  transform: scale(1.05);
  filter: brightness(0.45) saturate(0.8);
  transition: transform 1600ms cubic-bezier(.72, 0, .12, 1),
              filter 900ms cubic-bezier(.72, 0, .12, 1);
  will-change: transform, filter;
  backface-visibility: hidden;
  pointer-events: none;
}

.pa-item.is-active .pa-img {
  filter: brightness(1) saturate(1);
  animation: paZoom 9s ease-in-out 200ms infinite alternate;
}

/* Slow zoom on the active frame, Camille Mormal-style. */
@keyframes paZoom {
  0%   { transform: scale(1);    }
  100% { transform: scale(1.05); }
}

/* Caption on the active frame: large, anchored to the bottom. */
.pa-cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: clamp(20px, 3vw, 40px) clamp(22px, 4vw, 56px);
  display: flex;
  align-items: flex-end;
  gap: clamp(16px, 2.4vw, 32px);
  color: #fff;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.78) 0%, rgba(0, 0, 0, 0) 100%);
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 500ms ease 250ms, transform 500ms ease 250ms;
  pointer-events: none;
}

.pa-item.is-active .pa-cap {
  opacity: 1;
  transform: translateY(0);
}

.pa-num {
  font-variant-numeric: tabular-nums;
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.72);
  white-space: nowrap;
  padding-bottom: 4px;
}

.pa-title {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
  flex: 1 1 auto;
}

.pa-year {
  font-variant-numeric: tabular-nums;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: rgba(255, 255, 255, 0.6);
  text-transform: uppercase;
}

.pa-text {
  font-weight: 600;
  font-size: clamp(16px, 2vw, 24px);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: #fff;
}

.pa-text::first-letter {
  text-transform: uppercase;
}

/* Vertical label for compressed slivers — rotated so it reads
   bottom-to-top along the slim column, like a book spine. */
.pa-edge {
  position: absolute;
  inset: 0;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: rgba(255, 255, 255, 0.82);
  white-space: nowrap;
  overflow: hidden;
  font-variant-numeric: tabular-nums;
  text-transform: lowercase;
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  padding: 16px 0;
  transition: opacity 300ms ease;
  pointer-events: none;
  background: linear-gradient(to bottom, rgba(0, 0, 0, 0.55), rgba(0, 0, 0, 0.05));
}

.pa-item.is-active .pa-edge {
  opacity: 0;
}

/* Hover preview: a touch of extra width on compressed slivers so
   the column feels responsive before clicking. */
.pa-item:hover:not(.is-active) {
  width: 64px;
}

.pa-item:hover:not(.is-active) .pa-img {
  filter: brightness(0.72) saturate(0.9);
}

@media (prefers-reduced-motion: reduce) {
  .pa-item,
  .pa-img,
  .pa-cap {
    transition: none;
  }
  .pa-item.is-active .pa-img {
    animation: none;
  }
}

@media (max-width: 760px) {
  .photos-hero {
    padding-top: 40px;
    padding-bottom: 40px;
  }

  .photos-accordion {
    --header-h: 72px;
  }

  .pa-item {
    width: 36px;
  }

  .pa-item:hover:not(.is-active) {
    width: 44px;
  }

  .pa-item.is-active {
    width: 90vw;
  }

  .pa-cap {
    padding: 18px 18px 22px;
    gap: 14px;
  }

  .pa-text {
    font-size: 16px;
  }
}