/* ============================================================
   艾吃米公司官网 · 全局设计系统 v2.1（米哈游蓝 · 克制简约）
   米哈游品牌蓝 #3778e5→#2563eb ｜ 去霓虹青、光效极淡
   ============================================================ */

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
  font-size: 17px;
  line-height: 1.7;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  background: var(--bg-primary);
  overflow-x: clip;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color .4s ease, color .4s ease;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font-family: inherit; font-size: inherit; color: inherit; }
ul, ol { list-style: none; }
h1, h2, h3, h4 { font-weight: 700; line-height: 1.2; letter-spacing: -0.035em; }

/* 标题与品牌字：HarmonyOS Sans SC（华为开源字体，免费可商用，按需加载分块）
   米哈游官网标题同款字族；正文保持系统黑体栈（微软雅黑/苹方） */
h1, h2, h3, h4, .hero-title, .section-title, .section-eyebrow,
.hero-eyebrow, .aichimi-letter, .aichimi-il, .stat-value, .stat-unit,
.btn, .nav-logo, .logo-mark, .navbar a, .footer-title {
  font-family: "HarmonyOS Sans SC", "Microsoft YaHei", "PingFang SC", "Helvetica Neue", sans-serif;
}

/* ---------- Design Tokens · 深色（默认，米哈游蓝暗色版） ---------- */
:root {
  --bg-primary: #0d1220;
  --bg-secondary: #121a2b;
  --bg-elevated: #1a2338;
  --card-bg: rgba(255,255,255,0.03);
  --card-bg-hover: rgba(255,255,255,0.06);
  --border: rgba(255,255,255,0.08);
  --border-strong: rgba(255,255,255,0.16);
  --text-primary: #eef1f8;
  --text-secondary: rgba(238,241,248,0.7);
  --text-tertiary: rgba(238,241,248,0.45);
  --brand-blue: #5b8def;
  --brand-purple: #3778e5;
  --brand-gradient: linear-gradient(135deg, #5b8def 0%, #3778e5 100%);
  --neon-cyan: #6ea1f0;
  --neon-cyan-soft: rgba(110,161,240,0.16);
  --neon-cyan-glow: rgba(110,161,240,0.22);
  --success: #00ff88;
  --warning: #ffaa00;
  --danger: #ff4d6d;
  --glass: rgba(13,18,32,0.72);
  --blur: blur(20px) saturate(180%);
  --shadow-card: 0 8px 40px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 30px rgba(110,161,240,0.10);
  --shadow-brand: 0 8px 30px rgba(91,141,239,0.30);
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --container: 1200px;
}

/* ---------- 浅色模式（米哈游官网同款：浅灰白底 + 品牌蓝） ---------- */
[data-theme="light"] {
  --bg-primary: #f7f8fa;
  --bg-secondary: #eef1f6;
  --bg-elevated: #ffffff;
  --card-bg: rgba(255,255,255,0.85);
  --card-bg-hover: #ffffff;
  --border: rgba(16,24,40,0.08);
  --border-strong: rgba(16,24,40,0.16);
  --text-primary: #16181d;
  --text-secondary: rgba(22,24,29,0.72);
  --text-tertiary: rgba(22,24,29,0.45);
  --brand-blue: #3778e5;
  --brand-purple: #2563eb;
  --brand-gradient: linear-gradient(135deg, #3778e5 0%, #2563eb 100%);
  --neon-cyan: #3778e5;
  --neon-cyan-soft: rgba(55,120,229,0.14);
  --neon-cyan-glow: rgba(55,120,229,0.20);
  --glass: rgba(255,255,255,0.80);
  --shadow-card: 0 8px 36px rgba(20,40,90,0.08);
  --shadow-glow: 0 0 28px rgba(55,120,229,0.10);
  --shadow-brand: 0 8px 28px rgba(55,120,229,0.28);
}

/* ---------- 布局 ---------- */
.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.section { padding: 120px 0; position: relative; }
.section-head { text-align: center; margin-bottom: 64px; }
.section-eyebrow {
  display: inline-block; font-size: 14px; font-weight: 600; letter-spacing: 0.08em;
  color: var(--neon-cyan); text-transform: uppercase; margin-bottom: 16px;
}
.section-title { font-size: clamp(32px, 4.5vw, 52px); margin-bottom: 18px; }
.section-sub { font-size: 19px; color: var(--text-secondary); max-width: 640px; margin: 0 auto; }
.gradient-text {
  background: var(--brand-gradient);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.neon-text { color: var(--neon-cyan); text-shadow: 0 0 20px var(--neon-cyan-glow); }

/* ---------- 滚动进度条 ---------- */
.scroll-progress {
  position: fixed; top: 0; left: 0; height: 2px; width: 100%;
  background: linear-gradient(90deg, var(--brand-blue), var(--neon-cyan));
  transform: scaleX(0); transform-origin: 0 50%; z-index: 1001;
}

/* ---------- 全局背景装饰 ---------- */
.bg-glow { position: absolute; border-radius: 50%; filter: blur(100px); pointer-events: none; z-index: 0; }
.bg-glow.blue { background: rgba(55,120,229,0.06); width: 500px; height: 500px; }
.bg-glow.purple { background: rgba(37,99,235,0.05); width: 460px; height: 460px; }
.bg-glow.cyan { background: rgba(55,120,229,0.04); width: 400px; height: 400px; }
.noise-overlay {
  position: fixed; inset: 0; z-index: 999; pointer-events: none; opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
#mouse-glow {
  position: fixed; top: 0; left: 0; width: 400px; height: 400px; border-radius: 50%;
  background: radial-gradient(circle, rgba(55,120,229,0.05) 0%, transparent 70%);
  pointer-events: none; z-index: 1; transform: translate(-50%,-50%);
  opacity: 0; transition: opacity .4s ease;
}
/* ---------- 导航栏 ---------- */
.navbar { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; padding: 18px 0; transition: all .35s ease; }
.navbar.scrolled {
  background: var(--glass);
  backdrop-filter: var(--blur); -webkit-backdrop-filter: var(--blur);
  border-bottom: 1px solid var(--border); padding: 12px 0;
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.nav-logo { display: flex; align-items: center; gap: 10px; font-size: 20px; font-weight: 700; }
.nav-logo .logo-mark {
  width: 36px; height: 36px; border-radius: 10px; background: var(--brand-gradient);
  display: grid; place-items: center; color: #fff; font-weight: 800; font-size: 18px;
  box-shadow: var(--shadow-brand);
}
.nav-links { display: flex; align-items: center; gap: 32px; }
.nav-links a {
  font-size: 15px; font-weight: 500; color: var(--text-secondary);
  position: relative; transition: color .25s ease; padding: 4px 0;
}
.nav-links a::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 2px; width: 100%;
  background: var(--neon-cyan); transform: scaleX(0); transform-origin: 0 50%; transition: transform .3s ease;
}
.nav-links a:hover, .nav-links a.active { color: var(--neon-cyan); }
.nav-links a:hover::after, .nav-links a.active::after { transform: scaleX(1); }
.nav-actions { display: flex; align-items: center; gap: 14px; }
.icon-btn {
  width: 40px; height: 40px; border-radius: 50%; border: 1px solid var(--border);
  background: var(--card-bg); display: grid; place-items: center; cursor: pointer;
  color: var(--text-primary); transition: all .25s ease;
}
.icon-btn:hover { border-color: var(--neon-cyan); color: var(--neon-cyan); box-shadow: var(--shadow-glow); }
.icon-btn svg { width: 18px; height: 18px; }
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 6px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--text-primary); border-radius: 2px; transition: all .3s ease; }
.mobile-menu {
  position: fixed; inset: 0; z-index: 998; background: var(--glass);
  backdrop-filter: var(--blur); -webkit-backdrop-filter: var(--blur);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 28px;
  opacity: 0; visibility: hidden; transition: all .35s ease;
}
.mobile-menu.open { opacity: 1; visibility: visible; }
.mobile-menu a { font-size: 24px; font-weight: 600; color: var(--text-primary); }
.mobile-menu a:hover { color: var(--neon-cyan); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 30px; border-radius: 980px; font-size: 16px; font-weight: 600;
  cursor: pointer; border: none; transition: transform .3s cubic-bezier(0.16,1,0.3,1), background .3s cubic-bezier(0.16,1,0.3,1), box-shadow .3s cubic-bezier(0.16,1,0.3,1), border-color .3s cubic-bezier(0.16,1,0.3,1), color .3s cubic-bezier(0.16,1,0.3,1);
  white-space: nowrap; position: relative; overflow: hidden;
}
.btn-primary { background: var(--brand-gradient); color: #fff; box-shadow: var(--shadow-brand); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 0 34px rgba(55,120,229,0.30); }
.btn-outline { background: transparent; color: var(--text-primary); border: 1.5px solid var(--border-strong); }
.btn-outline:hover { background: var(--card-bg-hover); border-color: var(--neon-cyan); color: var(--neon-cyan); }
.btn-sm { padding: 10px 22px; font-size: 14px; }
.btn svg { width: 18px; height: 18px; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ---------- 徽章 / 标签 ---------- */
.badge { display: inline-flex; align-items: center; padding: 5px 14px; border-radius: 980px; font-size: 13px; font-weight: 600; }
.badge-primary { background: var(--neon-cyan-soft); color: var(--neon-cyan); border: 1px solid rgba(55,120,229,0.25); }
.badge-ghost { background: var(--card-bg); color: var(--text-secondary); border: 1px solid var(--border); }
.tag-cloud { display: flex; flex-wrap: wrap; gap: 12px; }
.tag {
  padding: 8px 18px; border-radius: 980px; font-size: 14px; font-weight: 500;
  background: var(--card-bg); border: 1px solid var(--border); color: var(--text-secondary);
  transition: all .25s ease; cursor: pointer;
}
.tag:hover { border-color: var(--neon-cyan); color: var(--neon-cyan); box-shadow: var(--shadow-glow); }

/* ---------- 卡片 ---------- */
.card {
  background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 32px; backdrop-filter: blur(10px); transition: all .35s cubic-bezier(0.16,1,0.3,1);
  position: relative; overflow: hidden;
}
.card:hover { background: var(--card-bg-hover); border-color: var(--border-strong); transform: translateY(-4px); box-shadow: var(--shadow-card); }

/* ---------- 表单 ---------- */
.form-group { margin-bottom: 20px; }
.form-label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 8px; color: var(--text-secondary); }
.form-control {
  width: 100%; padding: 13px 16px; border-radius: var(--radius-sm);
  background: var(--card-bg); border: 1.5px solid var(--border); color: var(--text-primary);
  font-size: 16px; transition: all .25s ease;
}
.form-control::placeholder { color: var(--text-tertiary); }
.form-control:focus { outline: none; border-color: var(--neon-cyan); box-shadow: 0 0 0 4px var(--neon-cyan-soft); }
.form-control.error { border-color: var(--danger); }
.form-error { display: none; font-size: 13px; color: var(--danger); margin-top: 6px; }
.form-control.error + .form-error { display: block; }
textarea.form-control { resize: vertical; min-height: 120px; }
select.form-control { cursor: pointer; }
.form-status { margin-top: 16px; padding: 14px 18px; border-radius: var(--radius-sm); font-size: 15px; display: none; }
.form-status.show { display: block; }
.form-status.success { background: rgba(0,255,136,0.1); color: var(--success); border: 1px solid rgba(0,255,136,0.3); }
.form-status.error { background: rgba(255,77,109,0.1); color: var(--danger); border: 1px solid rgba(255,77,109,0.3); }

/* ---------- 折叠 ---------- */
.accordion-item { border: 1px solid var(--border); border-radius: var(--radius-md); margin-bottom: 14px; overflow: hidden; background: var(--card-bg); transition: all .3s ease; }
.accordion-item:hover { border-color: var(--border-strong); }
.accordion-head { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 22px 26px; background: none; border: none; cursor: pointer; text-align: left; }
.accordion-title { font-size: 18px; font-weight: 600; }
.accordion-meta { display: flex; gap: 14px; font-size: 14px; color: var(--text-tertiary); flex: 1; flex-wrap: wrap; }
.accordion-chevron { width: 20px; height: 20px; flex-shrink: 0; transition: transform .35s ease; color: var(--text-secondary); }
.accordion-item.open .accordion-chevron { transform: rotate(180deg); color: var(--neon-cyan); }
.accordion-item.open { border-color: rgba(55,120,229,0.22); }
.accordion-body { max-height: 0; overflow: hidden; transition: max-height .45s cubic-bezier(0.16,1,0.3,1); }
.accordion-inner { padding: 0 26px 24px; color: var(--text-secondary); }

/* ---------- 页脚 ---------- */
.footer { background: var(--bg-secondary); border-top: 1px solid var(--border); padding: 72px 0 32px; position: relative; }
.footer-grid { display: grid; grid-template-columns: 1.6fr repeat(3,1fr); gap: 40px; margin-bottom: 48px; }
.footer-brand p { color: var(--text-secondary); font-size: 15px; margin: 16px 0 20px; max-width: 300px; }
.footer-col h4 { font-size: 15px; margin-bottom: 18px; }
.footer-col a { display: block; font-size: 14px; color: var(--text-secondary); margin-bottom: 12px; transition: color .2s ease; }
.footer-col a:hover { color: var(--neon-cyan); }
.social-row { display: flex; gap: 12px; }
.social-row .icon-btn { width: 38px; height: 38px; }
.footer-bottom { border-top: 1px solid var(--border); padding-top: 28px; display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 13px; color: var(--text-tertiary); }

/* ---------- 入场动画初始态 ---------- */
.reveal { opacity: 0; transform: translateY(40px); }
.no-gsap .reveal, .reduced-motion .reveal { opacity: 1; transform: none; }

/* ---------- 逐字动画（VRoid 风格，仅首页） ---------- */
.sc {
  display: inline-block;
  white-space: pre;
  will-change: transform, opacity, filter;
  backface-visibility: hidden;
}
.sc-lat { margin-right: -0.03em; }
.no-gsap .sc { filter: none !important; opacity: 1 !important; transform: none !important; }

/* ---------- 响应式 ---------- */
@media (max-width: 991px) {
  .section { padding: 90px 0; }
  .nav-links { display: none; }
  .nav-actions .btn { display: none; }
  .nav-toggle { display: flex; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 640px) {
  body { font-size: 16px; }
  .container { padding: 0 20px; }
  .section { padding: 70px 0; }
  .section-head { margin-bottom: 44px; }
  .card { padding: 24px; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  html { scroll-behavior: auto; }
  #mouse-glow, .noise-overlay { display: none; }
}

/* ============================================================
   v2.0 升级层 — 国际化 / 动效 / 极简风格增强（在 v1.1 基础上追加）
   ============================================================ */
::selection { background: rgba(55,120,229,.20); }
:focus-visible { outline: 2px solid var(--brand-blue); outline-offset: 2px; border-radius: 6px; }

/* ---------- 语言切换器 ---------- */
.lang-switch {
  display: inline-flex; align-items: center; gap: 2px; padding: 3px;
  border-radius: 980px; border: 1px solid var(--border); background: var(--card-bg);
}
.lang-switch .lang-opt {
  border: none; background: transparent; cursor: pointer; font-family: inherit;
  font-size: 13px; font-weight: 600; padding: 5px 11px; border-radius: 980px;
  color: var(--text-secondary); transition: all .2s ease; line-height: 1;
}
.lang-switch .lang-opt:hover { color: var(--brand-blue); }
.lang-switch .lang-opt.active { background: var(--brand-gradient); color: #fff; box-shadow: var(--shadow-brand); }

/* ---------- 英文模式排版 ---------- */
.lang-en body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
}
.lang-en .hero-title, .lang-en h1, .lang-en h2 { letter-spacing: -0.03em; }
.lang-en .hero-sub, .lang-en p { letter-spacing: -0.01em; }

/* ---------- 响应式：语言切换器适配 ---------- */
@media (max-width: 991px) {
  .nav-actions { gap: 10px; }
}
@media (max-width: 480px) {
  .nav-actions .lang-switch .lang-opt { padding: 5px 8px; font-size: 12px; }
  .hero-title { font-size: 34px; }
  .hero-sub { font-size: 16px; }
}

/* ---------- 移动端防横向溢出：装饰光斑（hero-glow/bg-glow）超出视口 ---------- */
.hero,
.section { overflow: hidden; }