/* =============================================================
   Organ Explainer AR — dark "AR lab" look
   Layout: dark scene, glowing teal accent like an AR scanner,
   3D viewers feel like holographic stages on a grid floor.
   ============================================================= */
:root {
  --bg: #071018;           /* deep night */
  --bg-2: #0b1822;
  --card: #0e1e29;
  --card-2: #12283a;
  --ink: #e6f2f0;
  --muted: #93aeb0;
  --line: rgba(64, 214, 199, .18);
  --line-strong: rgba(64, 214, 199, .45);
  --brand: #2fd3c3;        /* scanner teal */
  --brand-ink: #03201d;
  --healthy: #4fd18b;
  --sick: #ff7a66;
  --warm: #ffc457;
  --warn-bg: rgba(255, 196, 87, .08);
  --warn-line: rgba(255, 196, 87, .45);
  --stage: radial-gradient(120% 90% at 50% 18%, #1a3646 0%, #0c1b25 55%, #071018 100%);
  --radius: 18px;
  --font: "Noto Sans", "Noto Sans Kannada", "Noto Sans Tamil", system-ui, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Menlo, monospace;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; background: var(--bg); }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: var(--font); font-size: 17px; line-height: 1.55;
  background-image: radial-gradient(60% 40% at 80% 0%, rgba(47, 211, 195, .10), transparent 70%),
                    radial-gradient(50% 35% at 0% 10%, rgba(255, 122, 102, .06), transparent 70%);
  background-attachment: fixed;
}
body.story-open { overflow: hidden; }
h1, h2, h3 { line-height: 1.2; margin: 0 0 .4em; text-wrap: balance; }
h1 { font-size: clamp(1.6rem, 4.4vw, 2.6rem); letter-spacing: -.01em; }
h2 { font-size: 1.2rem; }
p { margin: 0 0 .6em; }
a { color: var(--brand); }
button { font: inherit; cursor: pointer; }
:focus-visible { outline: 3px solid var(--warm); outline-offset: 2px; }
[hidden] { display: none !important; }

/* ---------- Top bar ---------- */
body::before { content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px); z-index: 30; background: var(--bg); }
.topbar {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 20;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding-block: 10px;
  padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px));
  background: rgba(7, 16, 24, .82); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 700; letter-spacing: .01em; }
.brand-mark {
  width: 32px; height: 32px; border-radius: 9px; color: var(--brand-ink);
  background: linear-gradient(135deg, var(--brand), #8af0e4); display: grid; place-items: center;
  box-shadow: 0 0 18px rgba(47, 211, 195, .45);
}
.lang { display: flex; background: var(--card); border: 1px solid var(--line); border-radius: 999px; padding: 3px; }
.lang button { border: 0; background: transparent; color: var(--muted); padding: 6px 10px; border-radius: 999px; font-size: .85rem; }
.lang button.active { background: var(--brand); color: var(--brand-ink); font-weight: 700; }

.disclaimer {
  margin: 0; padding-block: 7px; font-size: .82rem; color: #f3d9a6;
  padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px));
  background: var(--warn-bg); border-bottom: 1px solid var(--warn-line);
}
.disclaimer strong {
  display: inline-grid; place-items: center; width: 18px; height: 18px; border-radius: 50%;
  background: var(--warm); color: #2a1a00; font-size: .72rem; margin-right: 4px;
}

/* ---------- Pages ---------- */
.page { max-width: 1180px; margin: 0 auto; padding-block: 22px 120px;
  padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; }
.muted { color: var(--muted); font-size: .9rem; }

.primary, a.primary {
  display: inline-flex; align-items: center; gap: 8px; justify-content: center;
  border: 0; border-radius: 999px; padding: 12px 20px; font-weight: 700; text-decoration: none;
  background: var(--brand); color: var(--brand-ink); box-shadow: 0 0 22px rgba(47, 211, 195, .35);
}
.primary.big { padding: 14px 24px; font-size: 1.02rem; }
.ghost, a.ghost {
  display: inline-flex; align-items: center; gap: 6px; justify-content: center;
  border: 1px solid var(--line-strong); background: transparent; color: var(--ink);
  border-radius: 999px; padding: 10px 16px; text-decoration: none; font-weight: 600;
}
.chip {
  display: inline-flex; align-items: center; gap: 6px; border: 1px solid var(--line-strong);
  background: rgba(7, 16, 24, .75); color: var(--ink); border-radius: 999px; padding: 8px 14px;
  font-weight: 600; font-size: .9rem; text-decoration: none; backdrop-filter: blur(6px);
}

/* ---------- Home ---------- */
.hero { display: grid; grid-template-columns: 1.15fr 1fr; gap: 28px; align-items: center; padding: 18px 0 28px; }
.hero-text { min-width: 0; }
.eyebrow { font-family: var(--mono); font-size: .78rem; letter-spacing: .14em; text-transform: uppercase; color: var(--brand); display: flex; align-items: center; gap: 8px; }
.pulse { width: 9px; height: 9px; border-radius: 50%; background: var(--brand); box-shadow: 0 0 0 0 rgba(47, 211, 195, .7); animation: ping 1.8s infinite; }
@keyframes ping { 70% { box-shadow: 0 0 0 10px rgba(47, 211, 195, 0); } 100% { box-shadow: 0 0 0 0 rgba(47, 211, 195, 0); } }
.hero h1 { font-size: clamp(1.9rem, 5vw, 3.1rem); }
.hero .sub { color: var(--muted); max-width: 54ch; font-size: 1.02rem; }
.modes { display: grid; gap: 10px; }
.mode {
  display: flex; align-items: center; gap: 14px; text-decoration: none; color: var(--ink);
  background: linear-gradient(90deg, var(--card-2), var(--card)); border: 1px solid var(--line);
  border-radius: 16px; padding: 14px 16px; transition: border-color .15s, transform .15s;
}
.mode:hover { border-color: var(--line-strong); transform: translateX(3px); }
.mode b { display: block; font-size: 1.02rem; }
.mode small { color: var(--muted); font-size: .85rem; }
.mode-ico { flex: none; width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center;
  color: var(--brand); background: rgba(47, 211, 195, .1); border: 1px solid var(--line-strong); }
.mode-ico svg { width: 24px; height: 24px; }
.section-title { font-size: 1rem; text-transform: uppercase; letter-spacing: .12em; color: var(--muted); margin: 8px 0 12px; scroll-margin-top: 80px; }

.cards { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
.c-card { display: flex; flex-direction: column; overflow: hidden; background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); transition: border-color .15s, transform .15s; }
.c-card:hover { border-color: var(--line-strong); transform: translateY(-3px); }
.c-card .thumb { position: relative; height: 180px; display: grid; place-items: center; background: var(--stage); overflow: hidden; }
.c-card .thumb::after { content: ""; position: absolute; inset: auto 0 0; height: 45%;
  background: repeating-linear-gradient(90deg, rgba(47,211,195,.12) 0 1px, transparent 1px 28px),
              repeating-linear-gradient(0deg, rgba(47,211,195,.12) 0 1px, transparent 1px 28px);
  transform: perspective(240px) rotateX(58deg); transform-origin: bottom; mask-image: linear-gradient(transparent, #000); }
.c-card .thumb img { position: relative; z-index: 1; max-height: 160px; max-width: 86%; object-fit: contain; filter: drop-shadow(0 12px 16px rgba(0,0,0,.55)); }
.c-card .badge { position: absolute; z-index: 2; top: 10px; right: 10px; font-family: var(--mono); font-size: .68rem; letter-spacing: .1em;
  padding: 3px 8px; border-radius: 6px; color: var(--brand); border: 1px solid var(--line-strong); background: rgba(7,16,24,.7); }
.c-card .c-body { padding: 14px 16px 16px; display: flex; flex-direction: column; gap: 4px; flex: 1; }
.c-card h2 { margin: 0; font-size: 1.15rem; }
.c-card h2 a { color: var(--ink); text-decoration: none; }
.c-card .c-body > p:not(.organ) { color: var(--muted); font-size: .92rem; margin: 0 0 8px; }
.c-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: auto; }
.c-actions a { padding: 9px 14px; font-size: .88rem; }
.organ { font-family: var(--mono); text-transform: uppercase; letter-spacing: .12em; font-size: .74rem; font-weight: 700; color: var(--brand); margin: 0; }

/* ---------- Condition ---------- */
.back { display: inline-block; color: var(--brand); text-decoration: none; font-weight: 600; margin-bottom: 10px; }
.title-block { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: 14px; margin-bottom: 14px; }
.title-block > div { min-width: 0; }
.hint { color: var(--muted); font-size: .9rem; margin: 0 0 10px; }
.view-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 14px; margin: 4px 0 12px; }
.view-switch { display: inline-flex; background: var(--card); border: 1px solid var(--line); border-radius: 999px; padding: 4px; }
.view-switch button { border: 0; background: transparent; color: var(--muted); font-weight: 600; padding: 8px 16px; border-radius: 999px; font-size: .95rem; }
.view-switch button.active { background: var(--brand); color: var(--brand-ink); }
.motion-btn { border: 1px solid var(--line-strong); background: transparent; color: var(--ink); border-radius: 999px; padding: 8px 14px; font-weight: 600; font-size: .9rem; }
.view-hint { margin: 0; color: var(--muted); font-size: .9rem; }

.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.side { display: flex; flex-direction: column; gap: 10px; min-width: 0; }
.viewer-card { position: relative; margin: 0; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.viewer-card.healthy { box-shadow: inset 0 0 0 1px rgba(79, 209, 139, .35); }
.viewer-card.diseased { box-shadow: inset 0 0 0 1px rgba(255, 122, 102, .35); }
/* holographic corner brackets */
.viewer-card::before { content: ""; position: absolute; inset: 10px; z-index: 1; pointer-events: none; border-radius: 12px;
  background:
    linear-gradient(var(--line-strong), var(--line-strong)) top left / 22px 2px no-repeat,
    linear-gradient(var(--line-strong), var(--line-strong)) top left / 2px 22px no-repeat,
    linear-gradient(var(--line-strong), var(--line-strong)) top right / 22px 2px no-repeat,
    linear-gradient(var(--line-strong), var(--line-strong)) top right / 2px 22px no-repeat,
    linear-gradient(var(--line-strong), var(--line-strong)) bottom left / 22px 2px no-repeat,
    linear-gradient(var(--line-strong), var(--line-strong)) bottom left / 2px 22px no-repeat,
    linear-gradient(var(--line-strong), var(--line-strong)) bottom right / 22px 2px no-repeat,
    linear-gradient(var(--line-strong), var(--line-strong)) bottom right / 2px 22px no-repeat; }
.viewer-card figcaption { position: absolute; top: 14px; left: 16px; z-index: 2; display: flex; align-items: center; gap: 6px;
  background: rgba(7, 16, 24, .78); border: 1px solid var(--line); padding: 4px 12px; border-radius: 999px; font-weight: 700; font-size: .85rem; }
.viewer-card .dot { width: 9px; height: 9px; border-radius: 50%; }
.viewer-card.healthy .dot { background: var(--healthy); box-shadow: 0 0 8px var(--healthy); }
.viewer-card.diseased .dot { background: var(--sick); box-shadow: 0 0 8px var(--sick); }

model-viewer { width: 100%; height: min(62vh, 520px); background: var(--stage); --poster-color: transparent; --progress-bar-color: var(--brand); }
.offscreen { position: absolute; width: 1px; height: 1px; left: -9999px; }
.reset { position: absolute; top: 14px; right: 16px; z-index: 2; border: 1px solid var(--line); background: rgba(7, 16, 24, .78); color: var(--ink);
  border-radius: 999px; padding: 4px 12px; font-size: .8rem; }
.ar-btn { position: absolute; bottom: 14px; left: 50%; transform: translateX(-50%); border: 0; border-radius: 999px; padding: 11px 20px;
  background: var(--brand); color: var(--brand-ink); font-weight: 700; box-shadow: 0 0 22px rgba(47, 211, 195, .5); }

/* parts list */
.parts { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.parts button { display: flex; align-items: center; gap: 8px; text-align: left; border: 1px solid var(--line); background: var(--card);
  color: var(--ink); border-radius: 999px; padding: 6px 12px 6px 6px; font-size: .88rem; }
.parts .n { display: inline-grid; place-items: center; width: 22px; height: 22px; border-radius: 50%; color: #04170f; font-size: .75rem; font-weight: 700; flex: none; }
.side.healthy .n { background: var(--healthy); }
.side.diseased .n { background: var(--sick); color: #2a0700; }
.parts button:hover { border-color: var(--line-strong); }
.parts button.active { border-color: var(--warm); background: rgba(255, 196, 87, .1); }

/* numbered dots on the 3D model */
.hotspot { width: 30px; height: 30px; border-radius: 50%; border: 2px solid #fff; padding: 0; color: #fff; font-weight: 700; font-size: 14px;
  box-shadow: 0 0 0 4px rgba(255,255,255,.12), 0 2px 10px rgba(0,0,0,.5); transition: transform .15s, opacity .2s; }
.healthy .hotspot { background: #23a866; }
.diseased .hotspot { background: #e0533f; }
.hotspot:hover, .hotspot.active { transform: scale(1.2); }
.hotspot.active { outline: 3px solid var(--warm); }
.hotspot:not([data-visible]) { opacity: .3; }

.both-ar { margin: 18px 0 8px; text-align: center; }

.info-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 22px; }
.about h2 { color: var(--brand); }
.about.condition { border-left: 4px solid var(--sick); }
.about p { color: #c9dcda; }
.treatment { margin-top: 28px; }
.treatment > h2 { font-size: 1rem; text-transform: uppercase; letter-spacing: .12em; color: var(--muted); }
.steps { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; counter-reset: s; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.steps li { counter-increment: s; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; }
.steps li::before { content: counter(s, decimal-leading-zero); font-family: var(--mono); color: var(--brand); font-weight: 700; font-size: .85rem; display: block; margin-bottom: 6px; }
.steps h3 { font-size: 1.05rem; }
.steps p { color: var(--muted); margin: 0; font-size: .95rem; }
.warning { margin-top: 20px; background: var(--warn-bg); border-color: var(--warn-line); }
.warning h2 { color: var(--warm); }
.warning p { color: #f0e2c4; }

/* description box inside the AR camera view */
.ar-info { position: absolute; left: 12px; right: 12px; bottom: calc(24px + env(safe-area-inset-bottom, 0px)); z-index: 5; max-width: 560px; margin: 0 auto;
  background: rgba(7, 16, 24, .9); color: var(--ink); border: 1px solid var(--line-strong); border-radius: 16px; padding: 14px 16px;
  box-shadow: 0 6px 24px rgba(0,0,0,.4); border-top: 4px solid var(--healthy); font-size: 1rem; line-height: 1.5; }
.ar-info.diseased { border-top-color: var(--sick); }
.ar-info h3 { margin: 0 0 6px; font-size: 1.05rem; }
.ar-info p { margin: 0 0 10px; color: #c9dcda; }
.ar-info-close { border: 1px solid var(--line-strong); background: transparent; color: var(--ink); border-radius: 999px; padding: 6px 16px; }
model-viewer:not([ar-status="session-started"]) .ar-info { display: none !important; }

/* info sheet */
.info { position: fixed; left: 0; right: 0; bottom: 0; z-index: 30; pointer-events: none;
  padding-left: max(12px, env(safe-area-inset-left, 0px)); padding-right: max(12px, env(safe-area-inset-right, 0px)); padding-bottom: calc(12px + env(safe-area-inset-bottom, 0px)); }
.info-inner { pointer-events: auto; max-width: 640px; margin: 0 auto; background: rgba(12, 27, 37, .96); border: 1px solid var(--line-strong);
  border-radius: 18px; padding: 18px 20px; box-shadow: 0 -6px 30px rgba(0,0,0,.5); border-top: 4px solid var(--brand); animation: up .2s ease-out; backdrop-filter: blur(10px); }
.info.healthy .info-inner { border-top-color: var(--healthy); }
.info.diseased .info-inner { border-top-color: var(--sick); }
.info-inner p { color: #c9dcda; }
.tag { font-family: var(--mono); font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: .1em; color: var(--muted); }
@keyframes up { from { transform: translateY(20px); opacity: 0; } }

.toast { position: fixed; top: calc(70px + env(safe-area-inset-top, 0px)); left: 50%; transform: translateX(-50%); z-index: 60;
  background: var(--card-2); color: var(--ink); border: 1px solid var(--line-strong); padding: 10px 16px; border-radius: 12px; font-size: .9rem; max-width: 90vw; text-align: center; }

.foot { text-align: center; color: var(--muted); font-size: .8rem; padding-block: 0 24px;
  padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); }
.foot .credits a { color: var(--muted); }

/* ---------- Guided AR story ---------- */
.story { position: fixed; inset: 0; z-index: 40; background: var(--bg); display: flex; flex-direction: column; }
.story-top { display: flex; align-items: center; gap: 10px; padding-block: calc(10px + env(safe-area-inset-top, 0px)) 10px;
  padding-left: max(14px, env(safe-area-inset-left, 0px)); padding-right: max(14px, env(safe-area-inset-right, 0px)); }
.story-organ { flex: 1; min-width: 0; text-align: center; font-family: var(--mono); font-size: .78rem; letter-spacing: .1em; text-transform: uppercase; color: var(--brand);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.story model-viewer { flex: 1; height: auto; min-height: 0; }
.story-ar { top: 14px; bottom: auto; }
.story-card { position: absolute; left: max(12px, env(safe-area-inset-left, 0px)); right: max(12px, env(safe-area-inset-right, 0px));
  bottom: calc(14px + env(safe-area-inset-bottom, 0px)); z-index: 5; max-width: 620px; margin: 0 auto;
  background: rgba(7, 16, 24, .9); border: 1px solid var(--line-strong); border-radius: 18px; padding: 14px 16px 14px;
  backdrop-filter: blur(10px); box-shadow: 0 10px 34px rgba(0,0,0,.5); color: var(--ink); }
.story-card.healthy { border-top: 3px solid var(--healthy); }
.story-card.diseased { border-top: 3px solid var(--sick); }
.story-card.treat { border-top: 3px solid var(--brand); }
.story-card.warn { border-top: 3px solid var(--warm); }
.story-progress { height: 4px; border-radius: 4px; background: rgba(255,255,255,.08); overflow: hidden; margin-bottom: 10px; }
.story-progress span { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--brand), #8af0e4); transition: width .35s; }
.story-step { margin: 0 0 4px; font-family: var(--mono); font-size: .74rem; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.story-card h3 { margin: 0 0 6px; font-size: 1.15rem; }
.story-card p#story-text { margin: 0 0 12px; color: #c9dcda; font-size: .98rem; max-height: 30vh; overflow: auto; }
.story-nav { display: flex; justify-content: space-between; gap: 10px; }
.story-nav button { padding: 10px 18px; }
.story-nav button:disabled { opacity: .35; cursor: default; }
.story-hint { margin: 0; text-align: center; color: var(--muted); font-size: .8rem; padding: 6px 16px calc(8px + env(safe-area-inset-bottom, 0px)); }
.story-dot { width: 26px; height: 26px; font-size: 0; border-width: 3px; animation: glow 1.4s ease-in-out infinite; }
.story-dot.healthy { background: var(--healthy); }
.story-dot.diseased { background: var(--sick); }
@keyframes glow { 0%, 100% { box-shadow: 0 0 0 0 rgba(255,255,255,.55), 0 0 12px rgba(255,255,255,.4); } 50% { box-shadow: 0 0 0 12px rgba(255,255,255,0), 0 0 20px rgba(255,255,255,.6); } }

@media (prefers-reduced-motion: reduce) {
  .pulse, .story-dot { animation: none; }
  .c-card, .mode { transition: none; }
}

/* ---------- Phone ---------- */
@media (max-width: 760px) {
  body { font-size: 16px; }
  .hero { grid-template-columns: 1fr; gap: 18px; padding-top: 8px; }
  .compare, .info-grid { grid-template-columns: 1fr; }
  model-viewer { height: 52vh; }
  .brand > span:last-child { font-size: .95rem; }
  .lang button { padding: 5px 8px; font-size: .78rem; }
  .title-block .primary.big { width: 100%; }
}
/* ---------- Projector / big screen ---------- */
@media (min-width: 1500px) {
  body { font-size: 19px; }
  .page { max-width: 1400px; }
  model-viewer { height: 600px; }
}