/* ============================================================
   EASE NATURE · 已夏家居 — 单屏首页 v8
   2D 手绘场景：干净 · 克制 · 精致
   ============================================================ */

:root {
  --bg: #070504;
  --cream: #f4ead8;
  --cream-soft: #cfc2aa;
  --muted: #8d8a7a;
  --amber: #e0a95e;
  --amber-soft: #b07a3c;
  --leaf: #9aa87e;
  --line: rgba(224, 169, 94, 0.14);
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
          "Source Han Sans SC", "Noto Sans SC", -apple-system, "Segoe UI", sans-serif;
  --ease-soft: cubic-bezier(0.33, 1, 0.68, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; }

body {
  background: var(--bg);
  color: var(--cream);
  font-family: var(--font);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  cursor: none;
}
body.touch { cursor: auto; }

::selection { background: rgba(224, 169, 94, 0.35); color: #fff; }
a { color: inherit; text-decoration: none; }

/* ============================================================
   进场遮罩
   ============================================================ */
.preloader {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 22px;
  background: #0a0806;
  transition: opacity 0.9s ease 0.2s, visibility 0.9s;
}
.preloader.done { opacity: 0; visibility: hidden; }
.pre-mark svg { animation: preBreath 2.6s ease-in-out infinite; }
@keyframes preBreath {
  0%, 100% { transform: scale(1); opacity: 0.7; }
  50% { transform: scale(1.12); opacity: 1; }
}
.pre-text { font-size: 12px; letter-spacing: 0.7em; text-indent: 0.7em; color: var(--cream-soft); opacity: 0.8; }
.pre-bar { width: 120px; height: 1px; background: rgba(224, 169, 94, 0.15); overflow: hidden; }
.pre-bar span { display: block; height: 100%; width: 0%; background: linear-gradient(90deg, var(--amber-soft), var(--amber)); transition: width 1.6s var(--ease-soft); }
.preloader.done .pre-bar span { width: 100%; }

/* ============================================================
   薄膜颗粒
   ============================================================ */
.grain {
  position: fixed;
  inset: -50%;
  width: 200%; height: 200%;
  pointer-events: none;
  z-index: 40;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  animation: grain 8s steps(10) infinite;
}
@keyframes grain {
  0%, 100% { transform: translate(0, 0); }
  10% { transform: translate(-5%, -10%); }
  20% { transform: translate(-15%, 5%); }
  30% { transform: translate(7%, -25%); }
  40% { transform: translate(-5%, 25%); }
  50% { transform: translate(-15%, 10%); }
  60% { transform: translate(15%, 0%); }
  70% { transform: translate(0%, 15%); }
  80% { transform: translate(3%, 35%); }
  90% { transform: translate(-10%, 10%); }
}

/* ============================================================
   设计感光标：圆点 + 开环
   ============================================================ */
.cursor-dot, .cursor-ring {
  position: fixed;
  top: 0; left: 0;
  z-index: 70;
  pointer-events: none;
  transform: translate(-50%, -50%);
  will-change: transform;
}
.cursor-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 10px rgba(224, 169, 94, 0.6);
}
.cursor-ring {
  width: 36px; height: 36px;
  color: rgba(224, 169, 94, 0.65);
  transition: width 0.35s var(--ease-soft), height 0.35s var(--ease-soft),
              color 0.35s;
}
.cursor-ring svg { width: 100%; height: 100%; display: block; }
.cursor-ring.hovering {
  width: 56px; height: 56px;
  color: rgba(224, 169, 94, 1);
}
body.touch .cursor-dot, body.touch .cursor-ring { display: none; }

/* ============================================================
   2D 场景画布
   ============================================================ */
#bg-canvas {
  position: fixed;
  inset: 0;
  width: 100vw; height: 100vh;
  z-index: 0;
  pointer-events: none;
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: radial-gradient(130vw 95vh at 50% 42%, transparent 55%, rgba(7, 5, 4, 0.75) 100%);
}

/* ============================================================
   顶部栏
   ============================================================ */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 26px 48px;
}
.logo { display: flex; align-items: center; gap: 12px; }
.logo-mark { display: grid; place-items: center; filter: drop-shadow(0 0 10px rgba(224, 169, 94, 0.25)); }
.logo-text { display: flex; flex-direction: column; line-height: 1.25; }
.logo-text b { font-size: 14px; letter-spacing: 0.26em; font-weight: 600; }
.logo-text i { font-style: normal; font-size: 10px; letter-spacing: 0.52em; color: var(--muted); }

.top-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--muted);
}
.top-meta .tm-dot {
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 8px rgba(224, 169, 94, 0.6);
  animation: dotPulse 3s ease-in-out infinite;
}
@keyframes dotPulse { 0%, 100% { opacity: 0.4; } 50% { opacity: 1; } }

/* ============================================================
   主舞台
   ============================================================ */
.stage {
  position: relative;
  z-index: 5;
  height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0 24px;
}

.eyebrow {
  font-size: 12px;
  letter-spacing: 0.6em;
  text-indent: 0.6em;
  color: var(--leaf);
  margin-bottom: 26px;
  opacity: 0.9;
}

.title {
  font-family: var(--font);
  font-weight: 600;
  font-size: clamp(34px, 5vw, 62px);
  line-height: 1.1;
  letter-spacing: 0.16em;
  white-space: nowrap;
}
.title .t-mask { display: block; }

.sub {
  margin-top: 18px;
  font-size: clamp(11px, 1.4vw, 13px);
  letter-spacing: 0.6em;
  text-indent: 0.6em;
  color: var(--cream-soft);
}

/* ============================================================
   系统按钮（分段式导航，与整体极简风格统一）
   ============================================================ */
.sys-row {
  margin-top: 52px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  max-width: 940px;
}
.sys-btn {
  position: relative;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 22px 14px 18px;
  min-width: 172px;
  color: var(--cream-soft);
  border: 1px solid rgba(224, 169, 94, 0.18);
  border-radius: 12px;
  background: rgba(18, 22, 14, 0.5);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  transition: border-color 0.35s, background 0.35s, color 0.35s, box-shadow 0.35s;
}
.sys-btn:hover {
  color: var(--cream);
  border-color: rgba(224, 169, 94, 0.55);
  background: rgba(28, 34, 21, 0.6);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
}
.sb-index {
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--amber);
  opacity: 0.7;
  font-variant-numeric: tabular-nums;
  transition: opacity 0.35s;
}
.sys-btn:hover .sb-index { opacity: 1; }
.sb-main { display: flex; flex-direction: column; align-items: flex-start; line-height: 1.3; }
.sb-main b { font-size: 14px; font-weight: 600; letter-spacing: 0.08em; }
.sb-main i { font-style: normal; font-size: 9px; letter-spacing: 0.32em; color: var(--muted); }
.sb-arrow {
  margin-left: auto;
  color: var(--amber);
  opacity: 0.4;
  transition: transform 0.35s var(--ease-soft), opacity 0.35s;
}
.sys-btn:hover .sb-arrow { transform: translateX(4px); opacity: 1; }

/* ============================================================
   底部状态栏
   ============================================================ */
.statusbar {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 48px;
  font-size: 10px;
  letter-spacing: 0.3em;
  color: var(--muted);
}
.statusbar .sb-center { font-size: 11px; letter-spacing: 0.5em; color: rgba(224, 169, 94, 0.65); }

/* ============================================================
   进场动画初始状态
   ============================================================ */
.js-ready .title, .js-ready .eyebrow, .js-ready .sub,
.js-ready .sys-btn { opacity: 0; transform: translateY(16px); }
.js-ready .topbar, .js-ready .statusbar { opacity: 0; }
.js-ready .cursor-dot, .js-ready .cursor-ring { opacity: 1; }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 900px) {
  .sys-btn { min-width: 145px; padding: 12px 18px; }
  .sb-text i { display: none; }
  .sys-row { gap: 12px; margin-top: 46px; }
}
@media (max-width: 560px) {
  .top-meta { display: none; }
  .topbar { padding: 18px 20px; }
  .statusbar { padding: 16px 20px; }
  .statusbar .sb-center { display: none; }
  .sys-row { margin-top: 38px; }
  .sys-btn { min-width: 44%; flex: 1 1 42%; }
}