/* ── CSS хувьсагчид (design tokens) ─────────────────────────────────────── */
:root {
 --bg-deep: #0d0b08;
 --bg-mid: #1a1510;
 --bg-horizon: #2e200f;
 --amber: #c8892a;
 --amber-soft: #e8b96a;
 --cream: #f0e6d0;
 --muted: rgba(240,230,208,0.38);
 --glass-bg: rgba(255,255,255,0.04);
 --glass-border: rgba(200,137,42,0.22);
 --glass-hover: rgba(200,137,42,0.12);
 --font-display: 'Cormorant Garamond', Georgia, serif;
 --font-ui: 'Jost', sans-serif;
 --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
}
/* ── Reset ───────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
 background: var(--bg-deep);
 color: var(--cream);
 font-family: var(--font-ui);
 font-weight: 300;
 overflow: hidden;
 height: 100dvh;
}
/* ── Арын дэвсгэр gradient ───────────────────────────────────────────────── */
.bg-gradient {
 position: fixed;
 inset: 0;
 z-index: 0;
 background:
 radial-gradient(ellipse 80% 60% at 50% 80%, var(--bg-horizon) 0%, transparent 70%),
 radial-gradient(ellipse 60% 40% at 50% 100%, #3d2508 0%, transparent 60%),
 var(--bg-deep);
 pointer-events: none;
}
/* ── Grain texture canvas ────────────────────────────────────────────────── */
#grain {
 position: fixed;
 inset: 0;
 z-index: 1;
 width: 100%;
 height: 100%;
 opacity: 0.045;
 pointer-events: none;
 mix-blend-mode: screen;
}
/* ── 3D дэлгэц ───────────────────────────────────────────────────────────── */
#container {
 position: fixed;
 inset: 0;
 z-index: 2;
}
#container canvas {
 opacity: 1;
 will-change: opacity;
 display: block;
}
/* ── Гарчиг ──────────────────────────────────────────────────────────────── */
.site-header {
 position: fixed;
 top: 40px;
 left: 50px;
 z-index: 10;
 animation: fadeSlideDown 1.2s var(--ease-out-expo) both;
}
.header-eyebrow {
 font-family: var(--font-ui);
 font-weight: 200;
 font-size: 10px;
 letter-spacing: 0.35em;
 text-transform: uppercase;
 color: var(--amber);
 margin-bottom: 6px;
 opacity: 0.85;
}
.header-title {
 font-family: var(--font-display);
 font-weight: 300;
 font-size: clamp(22px, 3vw, 38px);
 letter-spacing: 0.04em;
 color: var(--cream);
 line-height: 1;
}
/* ── Товчлуур хэсэг ──────────────────────────────────────────────────────── */
.controls {
 position: fixed;
 bottom: 44px;
 left: 50%;
 transform: translateX(-50%);
 z-index: 10;
 display: flex;
 gap: 10px;
 animation: fadeSlideUp 1.2s var(--ease-out-expo) 0.3s both;
}
.controls button {
 position: relative;
 display: flex;
 flex-direction: column;
 align-items: center;
 gap: 2px;
 padding: 14px 22px 12px;
 background: var(--glass-bg);
 border: 1px solid var(--glass-border);
 border-radius: 3px;
 color: var(--cream);
 cursor: pointer;
 outline: none;
 backdrop-filter: blur(16px) saturate(1.4);
 -webkit-backdrop-filter: blur(16px) saturate(1.4);
 transition:
 background 0.35s var(--ease-out-expo),
 border-color 0.35s var(--ease-out-expo),
 transform 0.35s var(--ease-out-expo),
 box-shadow 0.35s var(--ease-out-expo);
 overflow: hidden;
}
.controls button::after {
 content: '';
 position: absolute;
 inset: 0;
 background: linear-gradient(160deg, rgba(200,137,42,0.18) 0%, transparent 60%);
 opacity: 0;
 transition: opacity 0.4s var(--ease-out-expo);
}
.controls button:hover {
 background: var(--glass-hover);
 border-color: var(--amber);
 transform: translateY(-3px);
 box-shadow:
 0 0 20px rgba(200,137,42,0.15),
 0 8px 32px rgba(0,0,0,0.5);
}
.controls button:hover::after { opacity: 1; }
.controls button.active {
 background: rgba(200,137,42,0.14);
 border-color: var(--amber-soft);
 box-shadow:
 0 0 28px rgba(200,137,42,0.25),
 inset 0 1px 0 rgba(200,137,42,0.3);
}
.controls button.active .btn-mn { color: var(--amber-soft); }
.btn-mn {
 font-family: var(--font-display);
 font-size: 16px;
 font-weight: 400;
 letter-spacing: 0.04em;
 color: var(--cream);
 transition: color 0.3s ease;
 position: relative;
 z-index: 1;
}
.btn-en {
 font-family: var(--font-ui);
 font-size: 8.5px;
 font-weight: 200;
 letter-spacing: 0.22em;
 text-transform: uppercase;
 color: var(--muted);
 position: relative;
 z-index: 1;
}
/* ── Зааварчилгаа ─────────────────────────────────────────────────────────── */
.hint {
 position: fixed;
 bottom: 14px;
 left: 50%;
 transform: translateX(-50%);
 z-index: 10;
 display: flex;
 align-items: center;
 gap: 8px;
 font-family: var(--font-ui);
 font-size: 9px;
 font-weight: 200;
 letter-spacing: 0.22em;
 text-transform: uppercase;
 color: rgba(240,230,208,0.28);
 animation: fadeIn 2s var(--ease-out-expo) 1s both;
 white-space: nowrap;
}
.hint-sep { opacity: 0.4; }
/* ── Keyframes ───────────────────────────────────────────────────────────── */
@keyframes fadeSlideDown {
 from { opacity: 0; transform: translateY(-18px); }
 to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeSlideUp {
 from { opacity: 0; transform: translateX(-50%) translateY(18px); }
 to { opacity: 1; transform: translateX(-50%) translateY(0); }
}
@keyframes fadeIn {
 from { opacity: 0; }
 to { opacity: 1; }
}
/* ── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 600px) {
 .site-header { top: 24px; left: 24px; }
 .controls { gap: 6px; bottom: 36px; }
 .controls button { padding: 11px 14px 9px; }
 .btn-mn { font-size: 14px; }
}