/* =========================================================
 *  壹作 YIZUO · 样式表
 *  设计语言：暖色"炉火 / 匠作" —— 深暖底 + 炉火橙金，
 *  与常见的冷蓝科技站刻意拉开差异；毛玻璃 + 衬线大标题，
 *  兼顾科技感与人文匠心。深浅双主题通过变量切换。
 * ========================================================= */

/* ---------- 主题变量 ---------- */
:root,
[data-theme="dark"] {
  --bg: #0F0D0B;
  --bg-2: #15110D;
  --surface: rgba(255, 255, 255, 0.045);
  --surface-2: rgba(255, 255, 255, 0.07);
  --border: rgba(232, 116, 59, 0.20);
  --border-soft: rgba(255, 255, 255, 0.08);
  --text: #F4EDE3;
  --text-muted: #A8998A;
  --ember: #E8743B;
  --ember-soft: #F0915A;
  --gold: #D9A441;
  --accent-grad: linear-gradient(135deg, #E8743B 0%, #D9A441 100%);
  --on-accent: #FFF8EF;
  --glow: rgba(232, 116, 59, 0.35);
  --shadow: 0 24px 60px -28px rgba(0, 0, 0, 0.75);
  --maxw: 1180px;
  --radius: 18px;
  --nav-bg: rgba(15, 13, 11, 0.62);
}

[data-theme="light"] {
  --bg: #F6F1E9;
  --bg-2: #EFE6D8;
  --surface: rgba(20, 13, 11, 0.03);
  --surface-2: rgba(20, 13, 11, 0.055);
  --border: rgba(184, 90, 37, 0.22);
  --border-soft: rgba(20, 13, 11, 0.10);
  --text: #2A211A;
  --text-muted: #6E5F4F;
  --ember: #C85A25;
  --ember-soft: #E0743C;
  --gold: #B7832B;
  --accent-grad: linear-gradient(135deg, #D9662E 0%, #C8932F 100%);
  --on-accent: #FFF8EF;
  --glow: rgba(216, 102, 43, 0.22);
  --shadow: 0 22px 50px -30px rgba(80, 50, 20, 0.45);
  --nav-bg: rgba(246, 241, 233, 0.68);
}

/* ---------- 基础 ---------- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-weight: 300;
  overflow-x: hidden;
  transition: background .5s ease, color .5s ease;
}
h1, h2, h3 { font-family: "Noto Serif SC", Georgia, serif; font-weight: 700; line-height: 1.2; letter-spacing: .01em; }
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
.hl {
  background: var(--accent-grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

/* ---------- 背景层 ---------- */
.bg-glow {
  position: fixed; inset: 0; z-index: -2; pointer-events: none;
  background:
    radial-gradient(60% 50% at 78% 8%, var(--glow), transparent 60%),
    radial-gradient(50% 45% at 12% 95%, rgba(217,164,65,0.12), transparent 60%),
    linear-gradient(180deg, var(--bg), var(--bg-2));
  transition: background .5s ease;
}
.bg-grain {
  position: fixed; inset: 0; z-index: -1; pointer-events: none; opacity: .05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
@media (prefers-color-scheme: light) { /* 占位：由 data-theme 控制，不依赖系统 */ }

/* ---------- 容器与通用 ---------- */
.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 110px 28px;
  scroll-margin-top: 84px;
}
.eyebrow {
  font-family: "Space Grotesk", "Noto Sans SC", sans-serif;
  letter-spacing: .28em; text-transform: uppercase;
  font-size: 12px; color: var(--ember-soft); margin: 0 0 18px;
}

/* ---------- 导航 ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  transition: background .4s ease, border-color .4s ease, backdrop-filter .4s ease;
  border-bottom: 1px solid transparent;
}
.nav.is-scrolled {
  background: var(--nav-bg);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-soft);
}
.nav__inner {
  max-width: var(--maxw); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 28px;
}
.brand { display: flex; align-items: center; gap: 12px; font-weight: 700; }
.brand__mark {
  width: 38px; height: 38px; border-radius: 11px;
  display: grid; place-items: center;
  background: var(--accent-grad); color: var(--on-accent);
  font-family: "Noto Serif SC", serif; font-size: 20px; font-weight: 900;
  box-shadow: 0 8px 22px -8px var(--glow);
}
.brand__name { font-family: "Noto Serif SC", serif; font-size: 19px; letter-spacing: .04em; display: flex; align-items: baseline; gap: 8px; }
.brand__sub { font-family: "Space Grotesk", sans-serif; font-size: 11px; letter-spacing: .22em; color: var(--text-muted); font-weight: 500; }
.nav__links { display: flex; gap: 30px; }
.nav__links a { font-size: 15px; color: var(--text-muted); position: relative; transition: color .25s; }
.nav__links a::after {
  content: ""; position: absolute; left: 0; bottom: -6px; height: 2px; width: 0;
  background: var(--accent-grad); transition: width .3s ease;
}
.nav__links a:hover { color: var(--text); }
.nav__links a:hover::after { width: 100%; }
.nav__actions { display: flex; align-items: center; gap: 14px; }

.theme-toggle {
  width: 40px; height: 40px; border-radius: 50%; cursor: pointer;
  border: 1px solid var(--border-soft); background: var(--surface);
  display: grid; place-items: center; transition: transform .3s, border-color .3s;
}
.theme-toggle:hover { transform: rotate(20deg); border-color: var(--ember); }
.theme-toggle__icon {
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--accent-grad);
  box-shadow: inset -5px -5px 0 0 var(--bg);
  transition: box-shadow .4s ease, background .4s ease;
}
[data-theme="light"] .theme-toggle__icon { box-shadow: inset 0 0 0 0 var(--bg); background: radial-gradient(circle at 50% 50%, #FFE7A8, #E8743B); }

.nav__burger { display: none; flex-direction: column; gap: 5px; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav__burger span { width: 24px; height: 2px; background: var(--text); border-radius: 2px; transition: .3s; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 26px; border-radius: 999px; font-size: 15px; font-weight: 500;
  cursor: pointer; border: 1px solid transparent; transition: transform .25s, box-shadow .25s, background .25s, color .25s;
  font-family: "Noto Sans SC", sans-serif;
}
.btn--primary { background: var(--accent-grad); color: var(--on-accent); box-shadow: 0 14px 34px -14px var(--glow); }
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 20px 40px -14px var(--glow); }
.btn--ghost { background: var(--surface); border-color: var(--border-soft); color: var(--text); }
.btn--ghost:hover { border-color: var(--ember); transform: translateY(-2px); }

/* ---------- Hero ---------- */
.hero { position: relative; padding: 150px 28px 30px; max-width: var(--maxw); margin: 0 auto; }
.hero__inner {
  display: grid; grid-template-columns: 1.05fr .95fr; gap: 40px; align-items: center;
  min-height: 72vh;
}
.hero__title {
  font-size: clamp(40px, 6.4vw, 76px); margin: 0 0 22px; font-weight: 900; letter-spacing: .005em;
}
.hero__lead { font-size: clamp(16px, 1.5vw, 19px); color: var(--text-muted); max-width: 30em; margin: 0 0 32px; }
.hero__cta { display: flex; gap: 14px; flex-wrap: wrap; }
.hero__trust { margin-top: 26px; font-size: 13px; color: var(--text-muted); letter-spacing: .04em; }

/* Hero 视觉：单点之光 */
.hero__visual { display: flex; flex-direction: column; align-items: center; gap: 22px; }
.orbit { width: min(420px, 86%); height: auto; overflow: visible; }
.orbit__halo { transform-box: view-box; transform-origin: 210px 210px; animation: haloPulse 5s ease-in-out infinite; }
.orbit__ring { fill: none; stroke: var(--border); stroke-width: 1.2; opacity: .8; }
.orbit__ring--2 { stroke-dasharray: 4 8; animation: ringSpin 40s linear infinite; transform-box: view-box; transform-origin: 210px 210px; }
.orbit__ring--3 { stroke-dasharray: 2 12; opacity: .5; animation: ringSpin 70s linear infinite reverse; transform-box: view-box; transform-origin: 210px 210px; }
.orbit__spin { transform-box: view-box; transform-origin: 210px 210px; }
.orbit__spin--1 { animation: ringSpin 14s linear infinite; }
.orbit__spin--2 { animation: ringSpin 22s linear infinite; }
.orbit__spin--3 { animation: ringSpin 30s linear infinite; }
.orbit__dot { fill: var(--ember); filter: drop-shadow(0 0 8px var(--glow)); }
.orbit__dot--sm { fill: var(--gold); }
.orbit__core { filter: drop-shadow(0 0 22px var(--glow)); }
.orbit__char { fill: var(--on-accent); font-family: "Noto Serif SC", serif; font-size: 44px; font-weight: 900; }
.orbit__legend { display: flex; flex-wrap: wrap; gap: 10px 18px; justify-content: center; list-style: none; padding: 0; margin: 0; }
.orbit__legend li { font-size: 13px; color: var(--text-muted); position: relative; padding-left: 14px; }
.orbit__legend li::before { content: ""; position: absolute; left: 0; top: 50%; width: 6px; height: 6px; border-radius: 50%; transform: translateY(-50%); background: var(--accent-grad); }

@keyframes haloPulse { 0%,100% { transform: scale(1); opacity: .9; } 50% { transform: scale(1.12); opacity: .55; } }
@keyframes ringSpin { to { transform: rotate(360deg); } }

/* 信任条滚动 */
.marquee { margin-top: 56px; border-top: 1px solid var(--border-soft); border-bottom: 1px solid var(--border-soft); overflow: hidden; padding: 18px 0; -webkit-mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent); mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent); }
.marquee__track { display: flex; gap: 26px; white-space: nowrap; width: max-content; animation: marquee 26s linear infinite; font-family: "Space Grotesk", "Noto Sans SC", sans-serif; letter-spacing: .12em; color: var(--text-muted); font-size: 14px; }
.marquee__track span:nth-child(even) { color: var(--ember); }
@keyframes marquee { to { transform: translateX(-50%); } }

/* ---------- 区块标题 ---------- */
.section__head { margin-bottom: 52px; position: relative; }
.section__num { font-family: "Space Grotesk", sans-serif; font-size: 14px; letter-spacing: .3em; color: var(--ember); display: block; margin-bottom: 10px; }
.section__title { font-size: clamp(30px, 4vw, 46px); margin: 0 0 8px; }
.section__kicker { color: var(--text-muted); margin: 0; font-size: 16px; }

/* ---------- 介绍 ---------- */
.about__big { font-family: "Noto Serif SC", serif; font-size: clamp(24px, 3.4vw, 40px); font-weight: 700; margin: 0 0 46px; max-width: 16em; }
.about__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.about__card {
  background: var(--surface); border: 1px solid var(--border-soft); border-radius: var(--radius);
  padding: 26px 22px; backdrop-filter: blur(8px); transition: transform .3s, border-color .3s, background .3s;
}
.about__card:hover { transform: translateY(-6px); border-color: var(--ember); background: var(--surface-2); }
.about__card h3 { font-size: 19px; margin: 0 0 10px; }
.about__card p { margin: 0; color: var(--text-muted); font-size: 14.5px; }

/* ---------- 能力 ---------- */
.services { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.service {
  position: relative; overflow: hidden;
  background: var(--surface); border: 1px solid var(--border-soft); border-radius: var(--radius);
  padding: 32px 30px; backdrop-filter: blur(8px); transition: transform .3s, border-color .3s;
}
.service::before {
  content: ""; position: absolute; inset: 0; background: var(--accent-grad); opacity: 0; transition: opacity .35s; z-index: 0;
}
.service:hover { transform: translateY(-6px); border-color: transparent; }
.service:hover::before { opacity: .08; }
.service > * { position: relative; z-index: 1; }
.service__icon { font-size: 30px; color: var(--ember); margin-bottom: 16px; }
.service__title { font-size: 22px; margin: 0 0 12px; }
.service__desc { color: var(--text-muted); font-size: 15px; margin: 0 0 18px; }
.service__tags { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { font-size: 12px; padding: 5px 12px; border-radius: 999px; border: 1px solid var(--border); color: var(--ember-soft); background: var(--surface); }

/* ---------- 案例 ---------- */
.cases { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.case {
  background: var(--surface); border: 1px solid var(--border-soft); border-radius: var(--radius);
  padding: 26px 24px; backdrop-filter: blur(8px); cursor: pointer; outline: none;
  transition: transform .3s, border-color .3s, box-shadow .3s; display: flex; flex-direction: column; min-height: 210px;
}
.case:hover, .case:focus-visible, .case.is-flipped { transform: translateY(-6px); border-color: var(--ember); box-shadow: var(--shadow); }
.case__top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.case__tag { font-size: 12px; padding: 4px 12px; border-radius: 999px; background: var(--surface-2); color: var(--ember-soft); border: 1px solid var(--border); }
.case__year { font-family: "Space Grotesk", sans-serif; font-size: 13px; color: var(--text-muted); }
.case__title { font-size: 20px; margin: 0 0 12px; line-height: 1.35; }
.case__desc { color: var(--text-muted); font-size: 14px; margin: 0 0 18px; flex: 1; }
.case__foot { display: flex; justify-content: space-between; align-items: center; gap: 10px; }
.case__result { font-size: 13px; color: var(--text); font-weight: 500; }
.case__more { font-size: 13px; color: var(--ember); opacity: 0; transform: translateX(-6px); transition: .3s; }
.case:hover .case__more, .case:focus-visible .case__more, .case.is-flipped .case__more { opacity: 1; transform: translateX(0); }

/* ---------- 流程 ---------- */
.process { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; counter-reset: step; }
.process__step {
  background: var(--surface); border: 1px solid var(--border-soft); border-radius: var(--radius);
  padding: 28px 24px; position: relative; transition: transform .3s, border-color .3s;
}
.process__step:hover { transform: translateY(-6px); border-color: var(--ember); }
.process__no { font-family: "Space Grotesk", sans-serif; font-size: 30px; font-weight: 700; background: var(--accent-grad); -webkit-background-clip: text; background-clip: text; color: transparent; display: block; margin-bottom: 14px; }
.process__step h3 { font-size: 20px; margin: 0 0 10px; }
.process__step p { margin: 0; color: var(--text-muted); font-size: 14.5px; }

/* ---------- 数据 ---------- */
.section--stats { padding-top: 40px; padding-bottom: 40px; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.stat { text-align: center; padding: 30px 16px; border: 1px solid var(--border-soft); border-radius: var(--radius); background: var(--surface); }
.stat__num { display: block; font-family: "Space Grotesk", "Noto Serif SC", sans-serif; font-size: clamp(34px, 5vw, 54px); font-weight: 700; background: var(--accent-grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat__label { color: var(--text-muted); font-size: 14px; letter-spacing: .06em; }

/* ---------- 联系 ---------- */
.contact { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
.contact__big { font-family: "Noto Serif SC", serif; font-size: clamp(26px, 3.4vw, 40px); margin: 0 0 28px; font-weight: 700; }
.contact__list { list-style: none; padding: 0; margin: 0 0 24px; display: grid; gap: 14px; }
.contact__list li { display: flex; gap: 16px; align-items: baseline; font-size: 15px; }
.contact__list span { color: var(--text-muted); min-width: 56px; font-size: 13px; letter-spacing: .1em; }
.contact__list a { color: var(--ember); border-bottom: 1px solid var(--border); }
.contact__note { color: var(--text-muted); font-size: 13px; border-left: 2px solid var(--ember); padding-left: 12px; }
.contact__form { background: var(--surface); border: 1px solid var(--border-soft); border-radius: var(--radius); padding: 30px; backdrop-filter: blur(8px); }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 13px; color: var(--text-muted); margin-bottom: 8px; letter-spacing: .05em; }
.field input, .field textarea {
  width: 100%; padding: 13px 15px; border-radius: 12px; font: inherit; font-size: 15px;
  background: var(--bg-2); color: var(--text); border: 1px solid var(--border-soft); transition: border-color .25s, box-shadow .25s;
}
.field input:focus, .field textarea:focus { outline: none; border-color: var(--ember); box-shadow: 0 0 0 3px var(--glow); }
.field textarea { resize: vertical; }
.contact__form .btn { width: 100%; }
.form__hint { min-height: 18px; font-size: 13px; margin: 12px 0 0; }
.form__hint.is-error { color: #E86A6A; }
.form__hint.is-ok { color: var(--gold); }

/* ---------- 页脚 ---------- */
.footer { border-top: 1px solid var(--border-soft); margin-top: 40px; }
.footer__inner { max-width: var(--maxw); margin: 0 auto; padding: 40px 28px; display: flex; flex-wrap: wrap; gap: 20px; align-items: center; justify-content: space-between; }
.footer__brand { display: flex; align-items: center; gap: 12px; font-weight: 700; font-family: "Noto Serif SC", serif; }
.footer__nav { display: flex; gap: 22px; flex-wrap: wrap; }
.footer__nav a { color: var(--text-muted); font-size: 14px; transition: color .25s; }
.footer__nav a:hover { color: var(--ember); }
.footer__copy { width: 100%; color: var(--text-muted); font-size: 13px; margin: 0; text-align: center; border-top: 1px solid var(--border-soft); padding-top: 18px; }

/* ---------- 滚动揭示 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .8s cubic-bezier(.2,.7,.2,1), transform .8s cubic-bezier(.2,.7,.2,1); }
.reveal.is-in { opacity: 1; transform: none; }
.reveal:nth-child(2) { transition-delay: .06s; }
.reveal:nth-child(3) { transition-delay: .12s; }
.reveal:nth-child(4) { transition-delay: .18s; }

/* ---------- 响应式 ---------- */
@media (max-width: 940px) {
  .hero__inner { grid-template-columns: 1fr; gap: 10px; min-height: auto; padding-top: 10px; }
  .hero__visual { order: -1; margin-bottom: 10px; }
  .about__grid { grid-template-columns: repeat(2, 1fr); }
  .services { grid-template-columns: 1fr; }
  .cases { grid-template-columns: repeat(2, 1fr); }
  .process { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .contact { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .nav__links {
    position: fixed; top: 70px; right: 16px; left: 16px; flex-direction: column; gap: 4px;
    background: var(--nav-bg); backdrop-filter: blur(16px); border: 1px solid var(--border-soft);
    border-radius: 16px; padding: 14px; transform: translateY(-12px); opacity: 0; pointer-events: none; transition: .3s;
  }
  .nav__links.is-open { transform: none; opacity: 1; pointer-events: auto; }
  .nav__links a { padding: 10px 8px; }
  .nav__cta { display: none; }
  .nav__burger { display: flex; }
  .section { padding: 80px 20px; }
  .about__grid, .cases, .process, .stats { grid-template-columns: 1fr; }
  .hero { padding-top: 120px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
}