/* ============================================================
   DH SOLAR — Design System
   德系黑红金 · 极简 B2B 科技风
   DAUERHAFT HELIOS
   ============================================================ */

:root {
  /* 品牌色 — 德国国旗黑红金 */
  --black: #111827;
  --black-soft: #1F2937;
  --gold: #FFCE00;
  --gold-dark: #E6B800;
  --red: #DD0000;
  --red-dark: #B00000;
  /* 中性色 */
  --white: #FFFFFF;
  --gray-50: #F9FAFB;
  --gray-100: #F3F4F6;
  --gray-200: #E5E7EB;
  --gray-300: #D1D5DB;
  --gray-400: #9CA3AF;
  --gray-500: #6B7280;
  --gray-600: #4B5563;
  --gray-700: #374151;
  /* 排版 */
  --font-sans: "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, system-ui, sans-serif;
  --h1: clamp(2.4rem, 6vw, 4.5rem);
  --h2: clamp(1.8rem, 4vw, 2.75rem);
  --h3: 1.35rem;
  --body: 1rem;
  --small: 0.875rem;
  --micro: 0.75rem;
  /* 间距 */
  --space-section: clamp(4rem, 9vw, 7.5rem);
  --container: 1200px;
  /* 其他 */
  --radius: 8px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 3px rgba(17,24,39,0.08);
  --shadow-md: 0 8px 30px rgba(17,24,39,0.10);
  --transition: all 0.28s cubic-bezier(0.25, 0.8, 0.25, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  font-size: var(--body);
  line-height: 1.7;
  color: var(--gray-700);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
h1, h2, h3, h4 { color: var(--black); font-weight: 700; line-height: 1.25; }

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.section { padding: var(--space-section) 0; }
.section--gray { background: var(--gray-50); }
.section--black { background: var(--black); color: var(--gray-300); }
.section--black h2, .section--black h3 { color: var(--white); }

/* ---------- 顶部语言条 ---------- */
.lang-bar {
  background: var(--black);
  color: var(--gray-300);
  font-size: var(--micro);
  letter-spacing: 0.04em;
}
.lang-bar .container { display: flex; justify-content: flex-end; gap: 18px; padding-top: 7px; padding-bottom: 7px; }
.lang-bar a { padding: 2px 2px; border-bottom: 1px solid transparent; transition: var(--transition); }
.lang-bar a:hover, .lang-bar a.active { color: var(--gold); border-bottom-color: var(--gold); }

/* ---------- 导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--gray-200);
}
.nav .container { display: flex; align-items: center; justify-content: space-between; height: 74px; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand__logo { font-size: 1.7rem; font-weight: 800; color: var(--black); letter-spacing: -0.02em; }
.brand__logo em { font-style: normal; color: var(--red); }
.brand__sub { font-size: var(--micro); color: var(--gray-500); letter-spacing: 0.14em; text-transform: uppercase; line-height: 1.2; }
.nav__menu { display: flex; align-items: center; gap: 30px; }
.nav__link { font-size: 0.95rem; font-weight: 600; color: var(--gray-700); position: relative; padding: 6px 0; transition: var(--transition); }
.nav__link::after {
  content: ""; position: absolute; left: 0; bottom: 0; width: 0; height: 2px;
  background: var(--red); transition: var(--transition);
}
.nav__link:hover, .nav__link.active { color: var(--black); }
.nav__link:hover::after, .nav__link.active::after { width: 100%; }
.nav__cta { margin-left: 6px; }
.nav__toggle { display: none; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 28px; border-radius: 4px;
  font-size: 0.95rem; font-weight: 700; letter-spacing: 0.02em;
  transition: var(--transition); border: 2px solid transparent; white-space: nowrap;
}
.btn--gold { background: var(--gold); color: var(--black); }
.btn--gold:hover { background: var(--gold-dark); transform: translateY(-2px); box-shadow: 0 10px 24px rgba(255,206,0,0.35); }
.btn--black { background: var(--black); color: var(--white); }
.btn--black:hover { background: var(--black-soft); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn--outline { background: transparent; border-color: var(--black); color: var(--black); }
.btn--outline:hover { background: var(--black); color: var(--white); }
.btn--ghost { background: transparent; border-color: rgba(255,255,255,0.5); color: var(--white); }
.btn--ghost:hover { border-color: var(--gold); color: var(--gold); }
.btn--lg { padding: 16px 36px; font-size: 1.05rem; }

/* ---------- Hero ---------- */
.hero { position: relative; min-height: 88vh; display: flex; align-items: center; overflow: hidden; background: var(--black); }
.hero__bg { position: absolute; inset: 0; z-index: 0; }
.hero__bg img, .hero__bg video { width: 100%; height: 100%; object-fit: cover; opacity: 0.55; }
.hero__bg video { position: absolute; inset: 0; }
.hero__content { position: relative; z-index: 2; padding: 120px 0; }
.hero__eyebrow {
  display: inline-block; font-size: var(--micro); font-weight: 700; letter-spacing: 0.28em; text-transform: uppercase;
  color: var(--gold); background: rgba(17,24,39,0.55); border: 1px solid rgba(255,206,0,0.45);
  padding: 8px 16px; border-radius: 3px; margin-bottom: 26px;
}
.hero h1 { color: var(--white); font-size: var(--h1); max-width: 15em; margin-bottom: 22px; }
.hero__sub { color: var(--gray-300); font-size: 1.15rem; max-width: 42em; margin-bottom: 38px; }
.hero__actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero--short { min-height: 46vh; }
.hero--short .hero__content { padding: 90px 0; }

/* ---------- 板块标题 ---------- */
.sec-head { max-width: 720px; margin-bottom: 48px; }
.sec-head--center { margin-left: auto; margin-right: auto; text-align: center; }
.sec-head__eyebrow { display: inline-flex; align-items: center; gap: 8px; font-size: var(--micro); font-weight: 700; letter-spacing: 0.24em; text-transform: uppercase; color: var(--red); margin-bottom: 14px; }
.sec-head__eyebrow::before { content: ""; width: 22px; height: 2px; background: var(--red); }
.sec-head--center .sec-head__eyebrow::after { content: ""; width: 22px; height: 2px; background: var(--red); }
.sec-head h2 { font-size: var(--h2); margin-bottom: 14px; }
.sec-head p { color: var(--gray-500); font-size: 1.05rem; }

/* ---------- 卡片 ---------- */
.card { background: var(--white); border: 1px solid var(--gray-200); border-radius: var(--radius-lg); overflow: hidden; transition: var(--transition); }
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.card--link { display: block; }

/* 产品卡 */
.pcard { display: flex; flex-direction: column; }
.pcard__media { aspect-ratio: 4/3; background: var(--gray-50); display: flex; align-items: center; justify-content: center; padding: 20px; border-bottom: 1px solid var(--gray-100); }
.pcard__media img { object-fit: contain; width: 100%; height: 100%; }
.pcard__body { padding: 22px 22px 24px; display: flex; flex-direction: column; flex: 1; }
.pcard__code { font-size: var(--micro); font-weight: 700; color: var(--red); letter-spacing: 0.18em; text-transform: uppercase; margin-bottom: 6px; }
.pcard h3 { font-size: 1.15rem; margin-bottom: 10px; }
.pcard p { font-size: var(--small); color: var(--gray-500); flex: 1; margin-bottom: 16px; }
.pcard__more { font-weight: 700; font-size: var(--small); color: var(--black); display: inline-flex; align-items: center; gap: 6px; }
.pcard__more::after { content: "→"; transition: var(--transition); }
.pcard:hover .pcard__more::after { transform: translateX(5px); color: var(--red); }

/* 网格 */
.grid { display: grid; gap: 28px; }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

/* ---------- 数据统计 ---------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; }
.stat { text-align: center; padding: 34px 16px; }
.stat__num { font-size: clamp(2rem, 4.5vw, 3.2rem); font-weight: 800; color: var(--gold); line-height: 1.1; }
.stat__label { font-size: var(--small); color: var(--gray-400); letter-spacing: 0.08em; text-transform: uppercase; margin-top: 8px; }

/* ---------- 认证墙 ---------- */
.cert-wall { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 26px 40px; }
.cert-wall span {
  font-size: 1.05rem; font-weight: 800; letter-spacing: 0.06em; color: var(--gray-400);
  padding: 10px 18px; border: 1.5px solid var(--gray-300); border-radius: 6px; transition: var(--transition);
}
.cert-wall span:hover { color: var(--black); border-color: var(--black); }

/* ---------- 案例卡 ---------- */
.rcard { position: relative; aspect-ratio: 4/3; overflow: hidden; border-radius: var(--radius-lg); display: block; }
.rcard img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s ease; }
.rcard:hover img { transform: scale(1.06); }
.rcard__overlay {
  position: absolute; inset: 0; display: flex; flex-direction: column; justify-content: flex-end;
  padding: 22px; background: linear-gradient(to top, rgba(17,24,39,0.88) 0%, rgba(17,24,39,0.25) 55%, transparent 100%);
  color: var(--white);
}
.rcard__tag { font-size: var(--micro); font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--gold); margin-bottom: 6px; }
.rcard__name { font-size: 1.05rem; font-weight: 700; }
.rcard__mw { position: absolute; top: 16px; right: 16px; background: var(--gold); color: var(--black); font-weight: 800; font-size: var(--small); padding: 6px 12px; border-radius: 4px; }

/* ---------- 筛选器 ---------- */
.filter-bar { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 36px; }
.filter-chip {
  padding: 9px 20px; border-radius: 100px; border: 1.5px solid var(--gray-300);
  font-size: var(--small); font-weight: 600; color: var(--gray-600); transition: var(--transition);
}
.filter-chip:hover { border-color: var(--black); color: var(--black); }
.filter-chip.active { background: var(--black); border-color: var(--black); color: var(--white); }

/* ---------- 客户证言 ---------- */
.quotes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.quote { background: var(--gray-50); border: 1px solid var(--gray-200); border-radius: var(--radius-lg); padding: 32px 28px; position: relative; }
.quote::before { content: "“"; position: absolute; top: 6px; left: 22px; font-size: 4rem; color: var(--gold); font-family: Georgia, serif; line-height: 1; }
.quote p { font-size: var(--small); color: var(--gray-600); margin-bottom: 20px; }
.quote__who { display: flex; align-items: center; gap: 12px; }
.quote__avatar { width: 42px; height: 42px; border-radius: 100px; background: var(--black); color: var(--gold); display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 1rem; }
.quote__name { font-weight: 700; color: var(--black); font-size: var(--small); }
.quote__role { font-size: var(--micro); color: var(--gray-500); }

/* ---------- 价值点 ---------- */
.vpoint { padding: 10px 0; }
.vpoint__icon { width: 54px; height: 54px; border-radius: 12px; background: var(--gray-100); border: 1.5px solid var(--gray-200); display: flex; align-items: center; justify-content: center; font-size: 1.5rem; margin-bottom: 18px; }
.vpoint h3 { font-size: 1.15rem; margin-bottom: 10px; }
.vpoint p { font-size: var(--small); color: var(--gray-500); }

/* ---------- CTA 大区 ---------- */
.cta-band { background: var(--black); position: relative; overflow: hidden; }
.cta-band::before { content: ""; position: absolute; width: 420px; height: 420px; border-radius: 100%; background: radial-gradient(circle, rgba(255,206,0,0.22), transparent 65%); top: -160px; right: -120px; }
.cta-band::after { content: ""; position: absolute; width: 340px; height: 340px; border-radius: 100%; background: radial-gradient(circle, rgba(221,0,0,0.18), transparent 65%); bottom: -140px; left: -100px; }
.cta-band .container { position: relative; z-index: 2; text-align: center; padding-top: var(--space-section); padding-bottom: var(--space-section); }
.cta-band h2 { color: var(--white); font-size: var(--h2); margin-bottom: 16px; }
.cta-band p { color: var(--gray-400); max-width: 560px; margin: 0 auto 36px; }
.cta-band .btn { margin: 0 8px; }

/* ---------- 页脚 ---------- */
.footer { background: var(--black); color: var(--gray-400); }
.footer__top { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 40px; padding: 64px 0 48px; }
.footer h4 { color: var(--white); font-size: 1rem; margin-bottom: 18px; letter-spacing: 0.02em; }
.footer a { color: var(--gray-400); font-size: var(--small); line-height: 2.1; transition: var(--transition); }
.footer a:hover { color: var(--gold); }
.footer__brand p { font-size: var(--small); color: var(--gray-500); margin-top: 14px; max-width: 300px; }
.footer__brand-logo { font-size: 1.5rem; font-weight: 800; color: var(--white); }
.footer__brand-logo em { font-style: normal; color: var(--red); }
.footer__contact li { font-size: var(--small); line-height: 2.1; }
.footer__contact .icon { color: var(--gold); margin-right: 8px; }
.footer__bottom { border-top: 1px solid rgba(255,255,255,0.1); padding: 20px 0; font-size: var(--micro); color: var(--gray-500); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }
.footer__lang a { color: var(--gray-500); margin-left: 14px; }
.footer__lang a:hover { color: var(--gold); }

/* ---------- 面包屑 / 页面内副标题 ---------- */
.page-sub { font-size: 1.1rem; color: var(--gray-500); max-width: 46em; }

/* ---------- 产品详情区 ---------- */
.pdetail { display: grid; grid-template-columns: 1.1fr 1fr; gap: 56px; align-items: center; padding: 40px 0; }
.pdetail--reverse .pdetail__media { order: 2; }
.pdetail__media { background: var(--gray-50); border: 1px solid var(--gray-200); border-radius: var(--radius-lg); padding: 30px; aspect-ratio: 4/3; display: flex; align-items: center; justify-content: center; }
.pdetail__media img { object-fit: contain; width: 100%; height: 100%; }
.pdetail h3 { font-size: 1.6rem; margin-bottom: 12px; }
.pdetail__code { font-size: var(--micro); font-weight: 700; color: var(--red); letter-spacing: 0.2em; text-transform: uppercase; margin-bottom: 8px; }
.pdetail p { color: var(--gray-600); margin-bottom: 16px; }
.pdetail ul li { font-size: var(--small); color: var(--gray-600); padding: 7px 0 7px 26px; position: relative; }
.pdetail ul li::before { content: ""; position: absolute; left: 4px; top: 15px; width: 8px; height: 8px; background: var(--gold); border-radius: 2px; }

/* ---------- 产品分类 Tab ---------- */
.tabs { display: flex; gap: 10px; margin-bottom: 40px; border-bottom: 2px solid var(--gray-200); padding-bottom: 14px; }
.tab {
  padding: 10px 26px; border-radius: 5px; font-weight: 700; font-size: 0.95rem; color: var(--gray-500);
  border: 1.5px solid var(--gray-300); transition: var(--transition);
}
.tab:hover { color: var(--black); border-color: var(--black); }
.tab.active { background: var(--black); color: var(--gold); border-color: var(--black); }

/* ---------- 联系表单 ---------- */
.form { max-width: 640px; }
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form__field { margin-bottom: 18px; }
.form__field label { display: block; font-size: var(--micro); font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--gray-500); margin-bottom: 8px; }
.form__field input, .form__field select, .form__field textarea {
  width: 100%; padding: 13px 16px; border: 1.5px solid var(--gray-300); border-radius: 6px;
  font-family: inherit; font-size: 0.95rem; color: var(--black); background: var(--white); transition: var(--transition);
}
.form__field input:focus, .form__field select:focus, .form__field textarea:focus {
  outline: none; border-color: var(--black); box-shadow: 0 0 0 3px rgba(17,24,39,0.08);
}
.form__field textarea { min-height: 130px; resize: vertical; }

/* ---------- 联系信息卡 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 56px; }
.cinfo__item { display: flex; gap: 16px; padding: 20px 0; border-bottom: 1px solid var(--gray-200); }
.cinfo__icon { width: 48px; height: 48px; flex: 0 0 48px; border-radius: 10px; background: var(--gray-100); display: flex; align-items: center; justify-content: center; font-size: 1.2rem; }
.cinfo__item h4 { font-size: var(--small); color: var(--gray-500); font-weight: 600; margin-bottom: 4px; }
.cinfo__item p, .cinfo__item a { font-size: 0.98rem; color: var(--black); font-weight: 600; }

/* ---------- 滚动动画 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- 移动端 ---------- */
@media (max-width: 992px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .quotes { grid-template-columns: 1fr; }
  .footer__top { grid-template-columns: 1fr 1fr; }
  .pdetail { grid-template-columns: 1fr; gap: 28px; }
  .pdetail--reverse .pdetail__media { order: 0; }
  .contact-grid { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .stat { padding: 28px 10px; }
  .stat__num { font-size: clamp(1.6rem, 4.2vw, 2.4rem); }
  .stat__label { font-size: 0.72rem; letter-spacing: 0.05em; }
}
@media (max-width: 480px) {
  .stats { gap: 10px; }
  .stat { padding: 20px 6px; }
  .stat__num { font-size: 1.5rem; }
  .stat__label { font-size: 0.65rem; letter-spacing: 0.02em; word-break: normal; }
}
@media (max-width: 768px) {
  .nav__menu {
    position: fixed; top: 0; right: -100%; width: min(320px, 82vw); height: 100vh;
    background: var(--white); flex-direction: column; align-items: flex-start; justify-content: flex-start;
    gap: 6px; padding: 96px 30px 40px; box-shadow: var(--shadow-md); transition: right 0.35s ease; z-index: 101;
  }
  .nav__menu.open { right: 0; }
  .nav__toggle { display: flex; flex-direction: column; gap: 5px; z-index: 102; padding: 8px; }
  .nav__toggle span { width: 24px; height: 2.5px; background: var(--black); transition: var(--transition); }
  .nav__toggle.open span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
  .nav__toggle.open span:nth-child(2) { opacity: 0; }
  .nav__toggle.open span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }
  .nav__link { font-size: 1.1rem; padding: 10px 0; }
  .nav__cta { margin-top: 16px; }
  .grid--2, .grid--3 { grid-template-columns: 1fr; }
  .hero { min-height: 78vh; }
  .hero__actions .btn { width: 100%; }
  .form__row { grid-template-columns: 1fr; }
  .footer__top { grid-template-columns: 1fr; gap: 32px; }
  .lang-bar { justify-content: center; }
}

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

/* ============================================================
   产品详情页 (Product Detail)
   ============================================================ */
.pd-hero { background: var(--black); }
.pd-hero .hero__content { padding: 90px 0 64px; }
.pd-hero h1 { font-size: clamp(2rem, 4.5vw, 3.2rem); }
.pd-hero .hero__sub { color: var(--gray-300); }

.pd-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 48px; align-items: start; }
.pd-media { border-radius: var(--radius-lg); overflow: hidden; background: var(--white); border: 1px solid var(--gray-200); }
.pd-media img { width: 100%; height: auto; display: block; aspect-ratio: 4/3; object-fit: cover; }
.pd-media__cap { padding: 14px 18px; font-size: var(--small); color: var(--gray-500); border-top: 1px solid var(--gray-200); }

.pd-body h2 { font-size: 1.6rem; margin: 8px 0 18px; }
.pd-body p { color: var(--gray-600); line-height: 1.75; margin-bottom: 16px; }
.pd-code { display: inline-block; font-size: var(--micro); font-weight: 700; letter-spacing: 0.24em; color: var(--red); border: 1px solid rgba(221,0,0,0.35); padding: 5px 12px; border-radius: 3px; margin-bottom: 14px; }

.spec-wrap { margin-top: 56px; }
.spec-wrap h2 { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
.spec-wrap h2::after { content: ""; flex: 1; height: 1px; background: var(--gray-200); }
.spec-table { width: 100%; border-collapse: collapse; background: var(--white); box-shadow: var(--shadow-sm); }
.spec-table th { background: var(--black); color: var(--white); text-align: left; padding: 14px 18px; font-size: var(--small); letter-spacing: 0.1em; text-transform: uppercase; }
.spec-table th:first-child { width: 42%; }
.spec-table td { border-bottom: 1px solid var(--gray-200); padding: 14px 18px; font-size: 0.95rem; vertical-align: top; }
.spec-table tr:nth-child(even) td { background: var(--gray-50); }
.spec-table td:first-child { font-weight: 600; color: var(--black); }
.spec-note { margin-top: 14px; font-size: var(--small); color: var(--gray-500); }

.pd-feats { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 24px 0; }
.pd-feats li { background: var(--gray-50); border: 1px solid var(--gray-200); border-radius: var(--radius); padding: 14px 16px; font-size: 0.92rem; color: var(--gray-700); }
.pd-feats li::before { content: "✓"; color: var(--red); font-weight: 700; margin-right: 8px; }

.pd-related { margin-top: 64px; }
.pd-related h3 { font-size: 1.2rem; margin-bottom: 20px; letter-spacing: 0.02em; }

.breadcrumb { font-size: var(--small); color: var(--gray-500); margin-bottom: 24px; }
.breadcrumb a { color: var(--gray-600); text-decoration: none; }
.breadcrumb a:hover { color: var(--red); }

@media (max-width: 768px) {
  .pd-grid { grid-template-columns: 1fr; gap: 28px; }
  .pd-feats { grid-template-columns: 1fr; }
  .spec-table th:first-child { width: 50%; }
}

/* ============================================================
   DH SOLAR — 开屏动画 + 滚动动画增强 (2026-10-04)
   ============================================================ */

/* ---------- Preloader 开屏动画 ---------- */
.preloader {
  position: fixed; inset: 0; z-index: 9999;
  background: var(--black);
  display: flex; align-items: center; justify-content: center;
  transition: transform 0.75s cubic-bezier(0.77, 0, 0.175, 1), opacity 0.6s ease, visibility 0s 0.75s;
}
.preloader--done { transform: translateY(-100%); opacity: 0; visibility: hidden; pointer-events: none; }
.preloader__inner { text-align: center; padding: 0 24px; }
.preloader__logo {
  font-size: clamp(2.6rem, 6vw, 4.4rem);
  font-weight: 800; letter-spacing: 0.06em; color: var(--white);
  opacity: 0; transform: translateY(26px);
  animation: preLogo 0.85s cubic-bezier(0.22, 0.61, 0.36, 1) 0.05s forwards;
}
.preloader__logo em { font-style: normal; color: var(--gold); }
.preloader__line {
  width: 0; height: 2px; margin: 22px auto 18px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  animation: preLine 0.7s ease 0.55s forwards;
}
.preloader__sub {
  font-size: var(--small); letter-spacing: 0.42em; text-transform: uppercase;
  color: var(--gray-400);
  opacity: 0;
  animation: preSub 0.7s ease 1.05s forwards;
}
@keyframes preLogo { to { opacity: 1; transform: none; } }
@keyframes preLine { to { width: 220px; } }
@keyframes preSub { to { opacity: 1; } }

/* ---------- Hero 首屏 staged reveal ---------- */
.hero--anim .hero__content > * {
  opacity: 0; transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.22, 0.61, 0.36, 1), transform 0.8s cubic-bezier(0.22, 0.61, 0.36, 1);
  transition-delay: var(--d, 0s);
}
.hero--anim.hero--in .hero__content > * { opacity: 1; transform: none; }
.hero--anim .hero__content > *:nth-child(1) { --d: 0.10s; }
.hero--anim .hero__content > *:nth-child(2) { --d: 0.28s; }
.hero--anim .hero__content > *:nth-child(3) { --d: 0.46s; }
.hero--anim .hero__content > *:nth-child(4) { --d: 0.64s; }
.hero--anim .hero__content > *:nth-child(5) { --d: 0.82s; }

/* ---------- 滚动 reveal 变体 ---------- */
.reveal--left { transform: translateX(-44px); }
.reveal--left.in { transform: none; }
.reveal--right { transform: translateX(44px); }
.reveal--right.in { transform: none; }
.reveal--zoom { transform: scale(0.94); }
.reveal--zoom.in { transform: none; }
.reveal--stagger { transition-delay: var(--reveal-delay, 0s); }

/* ---------- Hero 视差 ---------- */
.hero--parallax .hero__bg video,
.hero--parallax .hero__bg img { will-change: transform; }

/* ---------- 导航滚动状态 ---------- */
.nav--scrolled { background: rgba(255,255,255,0.96); box-shadow: 0 8px 30px rgba(0,0,0,0.18); }

/* ---------- 移动端降级：开屏动画仅在桌面启用 ---------- */
@media (max-width: 767px) {
  .preloader { display: none; }
  .hero--anim .hero__content > * { opacity: 1; transform: none; }
}
@media (prefers-reduced-motion: reduce) {
  .preloader { display: none; }
  .hero--anim .hero__content > * { opacity: 1; transform: none; }
  .reveal, .reveal--left, .reveal--right, .reveal--zoom { opacity: 1; transform: none; transition: none; }
}
/* ---------- 品牌合作墙（Tier 1 partners） ---------- */
.brand-wall {
  display: flex; flex-wrap: wrap; gap: 32px; align-items: center; justify-content: center;
  padding: 36px 24px 44px;
}
.brand-wall img {
  height: 46px; width: auto; max-width: 170px; object-fit: contain;
  filter: grayscale(100%) opacity(0.7);
  transition: filter 0.3s ease, transform 0.3s ease;
}
.brand-wall img:hover { filter: grayscale(0%) opacity(1); transform: translateY(-2px); }
.brand-wall--card { flex-direction: column; gap: 12px; padding: 16px 0 4px; }
.brand-wall--card img { height: 32px; max-width: 130px; }
.brand-wall__label {
  font-size: var(--micro); font-weight: 700; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--gray-500); margin-bottom: 6px;
}
@media (max-width: 767px) {
  .brand-wall img { height: 36px; max-width: 130px; }
}
/* 更多合作品牌进行中 */
.brand-wall__more {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: var(--micro); font-weight: 700; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--gray-500); border: 1px dashed var(--gray-300); border-radius: 100px;
  padding: 10px 18px; margin-top: 8px; white-space: nowrap;
}
.brand-wall__more::before { content: "+"; color: var(--gold); font-weight: 800; font-size: 1rem; line-height: 1; }
/* lang-bar social icons */
.lang-bar__social{display:inline-flex;align-items:center;gap:11px;margin-left:16px;padding-left:16px;border-left:1px solid rgba(255,255,255,.22);}
.lang-bar__social a{display:inline-flex;align-items:center;justify-content:center;width:18px;height:18px;padding:0;border-bottom:none!important;}
.lang-bar__social a:hover{color:var(--gold);border-bottom:none!important;}
.lang-bar__social svg{width:16px;height:16px;fill:currentColor;}
@media(max-width:560px){.lang-bar .container{flex-wrap:wrap;justify-content:flex-end;}.lang-bar__social{margin-left:0;padding-left:0;border-left:none;}}