/* ==========================================================================
   Di Sản Gửi Trao — shared styles
   ========================================================================== */
:root {
  /* Palette of the Duc Thuy set: river indigo, jade sky, cloud white, bamboo */
  --ink: #e8f0ec;              /* mist white */
  --ink-2: #c2d4d0;
  --muted: #8ba5a7;
  --jade: #8ccbbb;             /* celadon sky of the painting */
  --jade-2: #b8e4d8;
  --jade-soft: rgba(140, 203, 187, .4);
  --bamboo: #d5b47c;           /* fan ribs */
  --cloud: #bfe0ee;            /* cloud border */
  --line: rgba(232, 240, 236, .12);
  --son: #8e1f17;              /* seal red */
  --bg: #04121b;               /* Day river at night */
  --bg-2: #08202e;
  --bg-3: #0d2c3d;
  --paper: #eef1e8;
  --paper-ink: #1c2a2b;
  --serif: 'Cormorant Garamond', 'Times New Roman', serif;
  --sans: 'Be Vietnam Pro', system-ui, sans-serif;
  --gutter: clamp(16px, 5vw, 72px);
  --ease: cubic-bezier(.22, .8, .2, 1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root { color-scheme: dark; }
html { background: var(--bg); }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-weight: 300;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }
::selection { background: var(--jade); color: var(--bg); }

html.lenis, html.lenis body { height: auto; }
.lenis.lenis-smooth { scroll-behavior: auto !important; }
.lenis.lenis-stopped { overflow: hidden; }

/* ---------- type ---------- */
.eyebrow {
  display: flex; align-items: center; gap: 14px;
  font-size: 10.5px; letter-spacing: .36em; text-transform: uppercase;
  color: var(--jade); font-weight: 400;
}
.eyebrow::before { content: ""; width: 28px; height: 1px; background: var(--jade-soft); flex: none; }
.eyebrow.center { justify-content: center; }
.eyebrow.center::after { content: ""; width: 28px; height: 1px; background: var(--jade-soft); }
.display {
  font-family: var(--serif); font-weight: 500;
  font-size: clamp(40px, 6vw, 92px); line-height: .98; letter-spacing: .005em;
}
.display em, .h2 em, .h3 em { font-style: italic; font-weight: 400; color: var(--jade); }
.h2 { font-family: var(--serif); font-weight: 500; font-size: clamp(34px, 4.2vw, 64px); line-height: 1.04; }
.h3 { font-family: var(--serif); font-weight: 500; font-size: clamp(26px, 2.4vw, 36px); line-height: 1.12; }
.lead { font-family: var(--serif); font-size: clamp(20px, 1.8vw, 26px); line-height: 1.5; color: var(--ink-2); }
.body { font-size: 15px; line-height: 1.85; color: var(--muted); }
.body + .body { margin-top: 14px; }
.small { font-size: 11px; letter-spacing: .24em; text-transform: uppercase; color: var(--muted); }
.rule { width: 120px; height: 1px; background: linear-gradient(90deg, var(--jade), transparent); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 12px;
  padding: 16px 28px; border: 1px solid var(--jade-soft); background: transparent; cursor: pointer;
  font-family: var(--sans); font-size: 11px; font-weight: 400; letter-spacing: .28em; text-transform: uppercase;
  color: var(--ink); transition: background .4s var(--ease), color .4s, border-color .4s;
}
.btn:hover { border-color: var(--jade); background: rgba(140, 203, 187, .1); }
.btn.solid { background: var(--jade); border-color: var(--jade); color: var(--bg); }
.btn.solid:hover { background: var(--jade-2); border-color: var(--jade-2); }
.btn:focus-visible, .link:focus-visible, a:focus-visible, button:focus-visible { outline: 1px solid var(--jade); outline-offset: 4px; }
.link {
  display: inline-flex; align-items: center; gap: 12px;
  font-size: 11px; letter-spacing: .28em; text-transform: uppercase; color: var(--ink);
  padding-bottom: 6px; border-bottom: 1px solid var(--jade-soft); transition: border-color .4s, color .4s;
}
.link:hover { color: var(--jade-2); border-color: var(--jade); }
.link .arr { transition: transform .5s var(--ease); }
.link:hover .arr { transform: translateX(6px); }

/* ---------- header ---------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  padding: calc(22px + env(safe-area-inset-top, 0px)) var(--gutter) 22px;
  transition: background .6s, padding .6s, transform .6s var(--ease);
}
.site-header.scrolled { background: linear-gradient(rgba(4, 18, 27, .82), rgba(4, 18, 27, 0)); }
.site-header.hidden { transform: translateY(-110%); }
.brand { display: flex; align-items: center; gap: 14px; }
.brand .mark { width: 38px; height: 38px; flex: none; display: block; }
.brand .words { display: flex; flex-direction: column; line-height: 1.1; }
.brand .words b { font-family: var(--serif); font-weight: 500; font-size: 17px; letter-spacing: .22em; white-space: nowrap; }
.brand .words span { font-size: 8px; letter-spacing: .34em; color: var(--muted); text-transform: uppercase; margin-top: 4px; white-space: nowrap; }
.site-nav { display: flex; align-items: center; gap: clamp(20px, 2.4vw, 34px); }
.site-nav a.nav-link {
  font-size: 10.5px; letter-spacing: .3em; text-transform: uppercase; color: var(--ink-2);
  position: relative; padding: 6px 0; transition: color .4s; white-space: nowrap;
}
.site-nav a.nav-link::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1px; background: var(--jade);
  transform: scaleX(0); transform-origin: right; transition: transform .6s var(--ease);
}
.site-nav a.nav-link:hover, .site-nav a.nav-link[aria-current="page"] { color: var(--ink); }
.site-nav a.nav-link:hover::after, .site-nav a.nav-link[aria-current="page"]::after { transform: scaleX(1); transform-origin: left; }
.site-nav .btn { padding: 12px 20px; }
.burger { display: none; background: none; border: 0; cursor: pointer; width: 40px; height: 40px; position: relative; }
.burger i { position: absolute; left: 9px; right: 9px; height: 1px; background: var(--ink); transition: transform .5s var(--ease), top .5s var(--ease); }
.burger i:nth-child(1) { top: 16px; }
.burger i:nth-child(2) { top: 23px; }
body.menu-open .burger i:nth-child(1) { top: 20px; transform: rotate(45deg); }
body.menu-open .burger i:nth-child(2) { top: 20px; transform: rotate(-45deg); }

.mobile-menu {
  position: fixed; inset: 0; z-index: 45; background: var(--bg);
  display: flex; flex-direction: column; justify-content: center; gap: 8px; padding: 0 var(--gutter);
  clip-path: inset(0 0 100% 0); transition: clip-path .8s var(--ease); visibility: hidden;
}
body.menu-open .mobile-menu { clip-path: inset(0 0 0 0); visibility: visible; }
.mobile-menu a.m-link { font-family: var(--serif); font-size: 38px; line-height: 1.3; }
.mobile-menu a.m-link small { display: block; font-family: var(--sans); font-size: 10px; letter-spacing: .3em; color: var(--jade); text-transform: uppercase; }
.mobile-menu .btn { margin-top: 28px; align-self: flex-start; }

/* ---------- footer ---------- */
.site-footer { position: relative; z-index: 6; background: var(--bg); border-top: 1px solid var(--line); padding: 90px var(--gutter) 34px; }
.foot-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 40px; }
.foot-grid h4 { font-size: 10px; letter-spacing: .32em; text-transform: uppercase; color: var(--jade); font-weight: 400; margin-bottom: 18px; }
.foot-grid ul { list-style: none; display: grid; gap: 10px; }
.foot-grid a { font-size: 14px; color: var(--ink-2); transition: color .3s; }
.foot-grid a:hover { color: var(--jade-2); }
.foot-quote { font-family: var(--serif); font-style: italic; font-size: 22px; line-height: 1.45; color: var(--ink-2); margin-top: 26px; max-width: 340px; }
.foot-bottom { margin-top: 80px; padding-top: 24px; border-top: 1px solid var(--line); display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; font-size: 11px; letter-spacing: .14em; color: var(--muted); }

/* ---------- curtain (page transition) ---------- */
.curtain {
  position: fixed; inset: 0; z-index: 100; background: var(--bg); pointer-events: none;
  display: grid; place-items: center;
}
.curtain .seal-big { width: 72px; height: 72px; display: block; }
.curtain .bar { position: absolute; left: 50%; bottom: 18vh; width: 160px; height: 1px; transform: translateX(-50%); background: rgba(236, 227, 207, .12); overflow: hidden; }
.curtain .bar b { position: absolute; inset: 0; background: var(--jade); transform: scaleX(0); transform-origin: left; transition: transform .4s ease; }

/* ---------- consult dialog ---------- */
dialog.consult {
  margin: auto; border: 0; padding: 0; background: transparent; color: var(--ink);
  width: min(980px, calc(100vw - 32px)); max-height: calc(100vh - 32px); max-height: calc(100dvh - 32px);
}
dialog.consult::backdrop { background: rgba(3, 5, 9, .78); backdrop-filter: blur(6px); }
dialog.consult[open] { animation: dlgIn .7s var(--ease); }
@keyframes dlgIn { from { opacity: 0; transform: translateY(24px); } }
.consult-inner { display: grid; grid-template-columns: .9fr 1.1fr; background: var(--bg-2); border: 1px solid var(--line); max-height: inherit; overflow: auto; }
.consult-art { position: relative; min-height: 420px; background: #0b0908 center/cover no-repeat; }
.consult-art::after { content: ""; position: absolute; inset: 0; background: linear-gradient(transparent 40%, rgba(4, 18, 27, .9)); }
.consult-art .cap { position: absolute; z-index: 1; left: 28px; right: 28px; bottom: 28px; }
.consult-form { padding: 44px 44px 36px; position: relative; }
.consult-form .x { position: absolute; top: 14px; right: 14px; width: 40px; height: 40px; border: 0; background: none; cursor: pointer; color: var(--muted); font-size: 22px; line-height: 1; }
.consult-form .x:hover { color: var(--ink); }
.consult-form h3 { margin: 14px 0 8px; }
.fields { display: grid; grid-template-columns: 1fr 1fr; gap: 18px 20px; margin-top: 26px; }
.field { display: flex; flex-direction: column; gap: 8px; }
.field.full { grid-column: 1 / -1; }
.field label { font-size: 10px; letter-spacing: .26em; text-transform: uppercase; color: var(--muted); }
.field label i { color: var(--jade); font-style: normal; }
.field input, .field select, .field textarea {
  font: inherit; font-size: 15px; font-weight: 300; color: var(--ink); background: transparent;
  border: 0; border-bottom: 1px solid rgba(236, 227, 207, .22); padding: 8px 0 10px; border-radius: 0; outline: none;
  transition: border-color .3s;
}
.field select { appearance: none; background: linear-gradient(45deg, transparent 50%, var(--jade) 50%) right 6px center / 6px 6px no-repeat; }
.field select option { background: var(--bg-2); color: var(--ink); }
.field textarea { resize: vertical; min-height: 70px; }
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--jade); }
.field.err input, .field.err select { border-color: #c4553f; }
.field .msg { font-size: 11.5px; color: #e0826b; min-height: 0; }
.consult-form .actions { display: flex; align-items: center; justify-content: space-between; gap: 18px; margin-top: 30px; flex-wrap: wrap; }
.consult-form .note { font-size: 12px; color: var(--muted); max-width: 300px; line-height: 1.6; }
.consult-done { display: none; text-align: left; padding: 30px 0 10px; }
.consult.sent .consult-done { display: block; }
.consult.sent form, .consult.sent .consult-form > .eyebrow, .consult.sent #consult-title, .consult.sent #consult-title + .body { display: none; }

/* ---------- reveal ---------- */
.reveal { opacity: 0; transform: translateY(28px); }
.split-word { display: inline-block; opacity: .14; }
.img-mask { overflow: hidden; position: relative; }
.img-mask img { width: 100%; height: 100%; object-fit: cover; transform: scale(1.12); }

/* ---------- section helpers ---------- */
.section { position: relative; z-index: 6; padding: clamp(90px, 14vh, 160px) var(--gutter); background: var(--bg); }
.section.alt { background: var(--bg-2); }
.wrap { max-width: 1320px; margin: 0 auto; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(32px, 6vw, 110px); align-items: center; }

/* ---------- story pages (3D) ---------- */
canvas.stage { position: fixed; inset: 0; width: 100%; height: 100%; z-index: 1; display: block; touch-action: pan-y; cursor: grab; }
canvas.stage.dragging { cursor: grabbing; }
.stage-bg { position: fixed; inset: 0; z-index: 0; background: radial-gradient(ellipse 55% 50% at 50% 46%, #1c4a56 0%, #0a2433 48%, var(--bg) 100%); }
.stage-bg.warm { background: radial-gradient(ellipse 55% 50% at 50% 46%, #3a2a1c 0%, #18110c 50%, #070504 100%); }
.grain { position: fixed; inset: -50%; z-index: 4; pointer-events: none; opacity: .065; mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='220' height='220'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
  animation: grain 1.2s steps(6) infinite; }
@keyframes grain { 0% { transform: translate(0, 0) } 25% { transform: translate(-3%, 2%) } 50% { transform: translate(2%, -3%) } 75% { transform: translate(-2%, -1%) } 100% { transform: translate(1%, 3%) } }
.vignette { position: fixed; inset: 0; z-index: 3; pointer-events: none; background: radial-gradient(ellipse 85% 80% at 50% 50%, transparent 55%, rgba(0, 0, 0, .55) 100%); }
.story { position: relative; z-index: 2; pointer-events: none; }

.panel { position: fixed; z-index: 5; max-width: 410px; pointer-events: none; opacity: 0; visibility: hidden; }
.panel::before { content: ""; position: absolute; inset: -28vh -22vw; z-index: -1; pointer-events: none;
  background: radial-gradient(closest-side, rgba(3, 14, 21, .82), rgba(3, 14, 21, .55) 55%, transparent); }
.stage-warm .panel::before { background: radial-gradient(closest-side, rgba(8, 5, 3, .84), rgba(8, 5, 3, .55) 55%, transparent); }
.panel .eyebrow { margin-bottom: 18px; }
.panel .h2 { font-size: clamp(30px, min(3.6vw, 7.5vh), 54px); margin-bottom: 18px; }
.panel .body { font-size: 14.5px; }
.panel .h2, .panel .body { text-shadow: 0 1px 18px rgba(3, 14, 21, .7); }
.panel .verse { font-family: var(--serif); font-style: italic; font-size: 21px; line-height: 1.55; color: var(--ink); margin-top: 18px; padding-left: 18px; border-left: 1px solid var(--jade-soft); }
.panel.left { left: var(--gutter); top: 50%; }
.panel.right { right: calc(var(--gutter) + 90px); top: 50%; }
.panel.top-left { left: var(--gutter); top: 17vh; }
.panel .actions { display: flex; flex-wrap: wrap; gap: 12px; pointer-events: auto; margin-top: 26px; }
.panel .includes { display: flex; flex-wrap: wrap; gap: 8px 22px; margin: 20px 0 0; font-size: 11px; letter-spacing: .22em; text-transform: uppercase; color: var(--ink); opacity: .8; }
.panel .includes span::before { content: "◆"; color: var(--jade); font-size: 7px; margin-right: 10px; vertical-align: 2px; }
.drag-hint { margin-top: 22px; font-size: 10.5px; letter-spacing: .3em; text-transform: uppercase; color: var(--muted); display: flex; align-items: center; gap: 12px; }
.drag-hint::before { content: ""; width: 22px; height: 22px; border: 1px solid var(--jade-soft); border-radius: 50%; background: radial-gradient(circle, var(--jade) 0 2px, transparent 3px); }

.hero-panel { position: fixed; z-index: 5; left: var(--gutter); top: 50%; max-width: 560px; pointer-events: none; }
.hero-panel > * { opacity: 0; }
.hero-panel h1 { font-family: var(--serif); font-weight: 500; line-height: .92; letter-spacing: .01em; margin: 18px 0 22px; }
.hero-panel h1 small { display: block; font-style: italic; font-weight: 400; color: var(--jade); font-size: clamp(28px, min(3.6vw, 7vh), 54px); margin-bottom: 6px; }
.hero-panel h1 span { display: block; font-size: clamp(44px, min(7.2vw, 13vh), 112px); text-transform: uppercase; letter-spacing: .02em; }
.hero-panel .rule { margin: 6px 0 22px; }
.hero-panel p { font-family: var(--serif); font-size: 22px; line-height: 1.5; color: var(--ink); opacity: .82; }

.scroll-hint { position: fixed; left: 50%; bottom: 28px; transform: translateX(-50%); z-index: 5; pointer-events: none; display: flex; flex-direction: column; align-items: center; gap: 12px; font-size: 10px; letter-spacing: .34em; text-transform: uppercase; color: var(--muted); opacity: 0; }
.scroll-hint i { width: 1px; height: 44px; background: linear-gradient(var(--jade), transparent); animation: drip 2.4s ease-in-out infinite; transform-origin: top; }
@keyframes drip { 0% { transform: scaleY(0); opacity: 1 } 60% { transform: scaleY(1); opacity: 1 } 100% { transform: scaleY(1); opacity: 0 } }

nav.chapters { position: fixed; right: var(--gutter); top: 50%; transform: translateY(-50%); z-index: 6; display: flex; flex-direction: column; gap: 18px; transition: opacity .6s; }
nav.chapters.off { opacity: 0; pointer-events: none; }
nav.chapters button { all: unset; cursor: pointer; display: flex; align-items: center; justify-content: flex-end; gap: 12px; font-size: 10px; letter-spacing: .28em; text-transform: uppercase; color: rgba(236, 227, 207, .35); transition: color .5s; }
nav.chapters button span { opacity: 0; transform: translateX(6px); transition: opacity .5s, transform .5s; }
nav.chapters button i { display: block; width: 18px; height: 1px; background: currentColor; transition: width .5s; }
nav.chapters button:hover span, nav.chapters button.active span { opacity: 1; transform: none; }
nav.chapters button.active { color: var(--jade); }
nav.chapters button.active i { width: 36px; }
nav.chapters button:focus-visible { outline: 1px solid var(--jade); outline-offset: 4px; }

.after { position: relative; z-index: 6; background: var(--bg); }
.after::before { content: ""; position: absolute; left: 0; right: 0; top: -30vh; height: 30vh; background: linear-gradient(transparent, var(--bg)); pointer-events: none; }

.specs { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); margin-top: 60px; }
.specs > div { padding: 26px 24px 4px 0; border-right: 1px solid var(--line); }
.specs > div:last-child { border-right: 0; }
.specs dt { font-size: 10px; letter-spacing: .3em; text-transform: uppercase; color: var(--jade); margin-bottom: 10px; }
.specs dd { font-family: var(--serif); font-size: 24px; line-height: 1.3; }
.specs dd small { display: block; font-family: var(--sans); font-size: 12px; color: var(--muted); margin-top: 6px; }

.next-work { display: grid; grid-template-columns: 1fr 1fr; min-height: 70vh; position: relative; z-index: 6; background: var(--bg-2); }
.next-work .img-mask { min-height: 50vh; }
.next-work .txt { display: flex; flex-direction: column; justify-content: center; gap: 22px; padding: 80px var(--gutter); }

.badge { display: inline-block; padding: 6px 12px; border: 1px solid var(--jade-soft); font-size: 9.5px; letter-spacing: .26em; text-transform: uppercase; color: var(--jade); }

#loader { position: fixed; inset: 0; z-index: 90; background: var(--bg); display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 26px; transition: opacity 1.2s ease, visibility 1.2s; }
#loader.done { opacity: 0; visibility: hidden; }
#loader .t { font-family: var(--serif); font-style: italic; font-size: 26px; color: var(--ink); }
#loader .bar { width: 180px; height: 1px; background: rgba(236, 227, 207, .12); position: relative; overflow: hidden; }
#loader .bar b { position: absolute; inset: 0; background: var(--jade); transform-origin: left; transform: scaleX(0); transition: transform .4s ease; }
#loader .s { font-size: 10px; letter-spacing: .36em; text-transform: uppercase; color: var(--muted); }

/* ---------- responsive ---------- */
@media (max-width: 1180px) {
  .site-nav .nav-link { display: none; }
  .burger { display: block; }
}
@media (max-width: 1024px) {
  .foot-grid { grid-template-columns: 1fr 1fr; }
  .specs { grid-template-columns: 1fr 1fr; }
  .specs > div:nth-child(2) { border-right: 0; }
}
@media (max-width: 820px), (max-aspect-ratio: 4/5) {
  .site-header { padding: calc(16px + env(safe-area-inset-top, 0px)) 16px 16px; }
  .site-header.scrolled { background: linear-gradient(rgba(4, 18, 27, .96), rgba(4, 18, 27, .7)); }
  .site-nav .btn { display: none; }
  .burger { display: block; }
  .brand .words b { font-size: 14px; letter-spacing: .16em; }
  .brand .words span { font-size: 7px; letter-spacing: .26em; }
  .brand .mark { width: 34px; height: 34px; }
  nav.chapters { display: none; }
  .panel, .hero-panel { left: 16px !important; right: 16px !important; top: auto !important; bottom: 7vh; max-width: none; }
  .panel { padding-top: 60px; }
  .panel::before { inset: -10vh -16px -7vh; background: linear-gradient(transparent, rgba(3, 14, 21, .86) 45%); }
  .stage-warm .panel::before { background: linear-gradient(transparent, rgba(8, 5, 3, .88) 45%); }
  .panel .h2 { font-size: 32px; }
  .panel .body { font-size: 13.5px; line-height: 1.75; }
  .panel .verse { font-size: 18px; }
  .hero-panel { bottom: 14vh; }
  .hero-panel h1 span { font-size: 44px; }
  .hero-panel h1 small { font-size: 30px; }
  .hero-panel p { font-size: 18px; }
  .scroll-hint { bottom: 16px; }
  .grid-2, .next-work { grid-template-columns: 1fr; }
  .consult-inner { grid-template-columns: 1fr; }
  .consult-art { min-height: 180px; }
  .consult-form { padding: 34px 20px 26px; }
  .fields { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .foot-grid { grid-template-columns: 1fr; }
  .specs { grid-template-columns: 1fr; }
  .specs > div { border-right: 0; border-bottom: 1px solid var(--line); }
}
@media (prefers-reduced-motion: reduce) {
  .grain, .scroll-hint i { animation: none; }
  .reveal { opacity: 1; transform: none; }
  .split-word { opacity: 1; }
}