/* ============================================================
       全局样式 — 与首页 styles.css 保持一致
    ============================================================ */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

    :root {
      --black:      #0e0e0c;
      --gold:       #c9a96e;
      --gold-dark:  #8b6914;
      --gold-light: #e8d5b0;
      --white:      #ffffff;
      --bg-warm:    #faf8f5;
      --bg-dark:    #111110;
      --text-body:  #3a3834;
      --text-mute:  #7a7570;
      --border:     rgba(201,169,110,0.2);
      --radius:     6px;
      --radius-lg:  12px;
      --shadow-sm:  0 2px 12px rgba(14,14,12,0.06);
      --shadow-md:  0 8px 32px rgba(14,14,12,0.10);
      --shadow-lg:  0 20px 60px rgba(14,14,12,0.14);
      --trans:      0.35s cubic-bezier(0.4,0,0.2,1);
    }

    html { scroll-behavior: smooth; font-size: 16px; }
    body {
      font-family: 'Outfit', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      background: var(--white);
      color: var(--black);
      line-height: 1.7;
      overflow-x: hidden;
    }

    a { text-decoration: none; color: inherit; }
    ul { list-style: none; }
    button { cursor: pointer; border: none; background: none; font-family: inherit; }
    img { display: block; width: 100%; height: 100%; object-fit: cover; }

    .noto { font-family: 'Noto Serif SC', 'STSong', 'SimSun', serif; }
    .container { max-width: 1260px; margin: 0 auto; padding: 0 40px; }
    .section { padding: 72px 0; }
    .gold { color: var(--gold); }

    /* ============================================================
       导航 — 始终白底
    ============================================================ */
    .nav-header {
      position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(18px) saturate(180%);
      -webkit-backdrop-filter: blur(18px) saturate(180%);
      box-shadow: 0 1px 0 var(--border);
    }
    /* 始终黑色文字 */
    .nav-header .logo-text     { color: var(--black) !important; }
    .nav-header .logo-vv       { background: var(--black) !important; border: none !important; }
    .nav-header .nav-links a   { color: var(--black) !important; }
    .nav-header .nav-links .nav-cta { background: var(--black) !important; color: var(--white) !important; }
    .nav-header .nav-links .nav-cta:hover { background: var(--gold) !important; color: var(--white) !important; }
    .nav-header .hamburger span { background: var(--black) !important; }
    .nav-inner {
      max-width: 1260px; margin: 0 auto; padding: 0 40px;
      height: 72px; display: flex; align-items: center; justify-content: space-between;
    }
    .nav-logo { display: flex; align-items: center; text-decoration: none; }
    .logo-img { height: 55px; width: auto; display: block; object-fit: contain; }
    .logo-img-footer { height: 36px; filter: brightness(0) invert(1); }
    /* 旧 logo-vv / logo-text 保留，图片加载失败时降级 */
    .logo-vv {
      width: 40px; height: 40px; background: var(--black); color: var(--gold);
      border-radius: 4px; display: flex; align-items: center; justify-content: center;
      font-size: 14px; font-weight: 800; letter-spacing: 1px; flex-shrink: 0;
    }
    .logo-text {
      font-size: 17px; font-weight: 700; letter-spacing: 1.5px;
      color: var(--black); line-height: 1;
    }
    .logo-text em { font-style: normal; font-size: 12px; font-weight: 400; color: var(--gold); display: block; letter-spacing: 2px; margin-top: 2px; font-family: 'Noto Serif SC', serif; }
    .nav-links { display: flex; align-items: center; gap: 36px; }
    .nav-links a {
      font-size: 14px; font-weight: 500; letter-spacing: 0.5px;
      color: var(--black); transition: color var(--trans); position: relative;
    }
    .nav-links a::after {
      content: ''; position: absolute; bottom: -4px; left: 0;
      width: 0; height: 1.5px; background: var(--gold); transition: width var(--trans);
    }
    .nav-links a:hover { color: var(--gold); }
    .nav-links a:hover::after { width: 100%; }
    .nav-links a.active { color: var(--gold); }
    .nav-links a.active::after { width: 100%; }
    /* CTA 基础样式（仅 layout，颜色由 .nav-header .nav-links .nav-cta 控制） */
    .nav-cta {
      padding: 9px 22px; border-radius: var(--radius);
      font-size: 13px !important; letter-spacing: 1px;
      transition: background var(--trans) !important;
    }
    .nav-cta::after { display: none !important; }
    .hamburger {
      display: none; flex-direction: column; gap: 5px; padding: 8px;
    }
    .hamburger span { display: block; width: 24px; height: 2px; background: var(--black); border-radius: 2px; transition: var(--trans); }
    .hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
    .hamburger.open span:nth-child(2) { opacity: 0; }
    .hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

    /* ============================================================
       移动端菜单
    ============================================================ */
    .mobile-menu {
      position: fixed; inset: 0; background: var(--bg-dark); z-index: 2000;
      display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 32px;
      transform: translateX(100%); transition: transform var(--trans);
    }
    .mobile-menu.open { transform: translateX(0); }
    .mobile-menu a {
      font-size: 24px; font-weight: 600; color: var(--white);
      letter-spacing: 3px; transition: color var(--trans);
    }
    .mobile-menu a:hover { color: var(--gold); }
    .mobile-close {
      position: absolute; top: 24px; right: 24px;
      font-size: 28px; color: var(--white); width: 44px; height: 44px;
      display: flex; align-items: center; justify-content: center;
    }

    /* ============================================================
       图片占位符
    ============================================================ */
    .img-placeholder {
      position: relative; background: linear-gradient(135deg, #f5f0e8 0%, #ede4d4 50%, #e8d5b0 100%);
      border: 1.5px dashed var(--gold); border-radius: var(--radius-lg);
      overflow: hidden; display: flex; align-items: center; justify-content: center;
    }
    .img-placeholder::before {
      content: ''; position: absolute; inset: 0;
      background: repeating-linear-gradient(45deg, transparent, transparent 18px, rgba(201,169,110,0.07) 18px, rgba(201,169,110,0.07) 19px);
    }
    .placeholder-label {
      position: absolute; bottom: 12px; right: 14px; font-size: 11px;
      font-family: 'Outfit', sans-serif; color: var(--gold-dark);
      background: rgba(255,255,255,0.8); padding: 3px 8px; border-radius: 3px;
      z-index: 1;
    }
    .img-placeholder img { opacity: 0; position: relative; z-index: 2; transition: opacity 0.5s; }
    .img-placeholder img.loaded { opacity: 1; }

    /* ============================================================
       HERO — 全屏深色 + 底部渐隐过渡
    ============================================================ */
    .hero {
      min-height: 100vh; display: flex; align-items: center;
      background: var(--black); position: relative; overflow: hidden; padding: 80px 0 0;
    }
    .hero::before {
      content: ''; position: absolute; inset: 0;
      background:
        radial-gradient(ellipse 70% 80% at 75% 50%, rgba(201,169,110,0.06) 0%, transparent 65%),
        repeating-linear-gradient(0deg, transparent, transparent 79px, rgba(201,169,110,0.03) 80px);
    }
    .hero::after {
      content: '';
      position: absolute; bottom: 0; left: 0; right: 0;
      height: 160px;
      background: linear-gradient(to bottom, transparent 0%, rgba(255,255,255,0.03) 60%, rgba(255,255,255,0.08) 100%);
      pointer-events: none;
    }
    .hero-grid {
      max-width: 1260px; margin: 0 auto; width: 100%;
      display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
      padding: 100px 40px 80px;
    }
    .hero-badge {
      display: inline-flex; align-items: center; gap: 8px;
      font-size: 11px; font-weight: 600; letter-spacing: 3px; color: var(--gold);
      text-transform: uppercase; margin-bottom: 20px;
    }
    .hero-badge::before { content: ''; width: 28px; height: 1px; background: var(--gold); }
    .hero-title {
      font-family: 'Noto Serif SC', serif; font-size: clamp(40px, 5vw, 60px);
      font-weight: 700; color: var(--white); line-height: 1.15; margin-bottom: 24px;
      letter-spacing: -1px;
    }
    .hero-title .gold { color: var(--gold); }
    .hero-subtitle {
      font-size: 15px; color: rgba(255,255,255,0.45); line-height: 1.9;
      margin-bottom: 36px; max-width: 500px;
    }
    .hero-stats {
      display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
    }
    .stat-card {
      background: rgba(255,255,255,0.04); border: 1px solid rgba(201,169,110,0.15);
      border-radius: var(--radius-lg); padding: 24px 20px;
      backdrop-filter: blur(8px);
    }
    .stat-num {
      font-family: 'Outfit', sans-serif; font-size: 38px; font-weight: 800;
      color: var(--gold); line-height: 1; margin-bottom: 6px;
    }
    .stat-num small { font-size: 16px; font-weight: 500; color: var(--gold-light); }
    .stat-label { font-size: 12px; color: rgba(255,255,255,0.35); letter-spacing: 0.5px; }

    .hero-right { position: relative; }
    .hero-img {
      width: 100%; aspect-ratio: 4/5; border-radius: var(--radius-lg);
      overflow: hidden;
    }

    /* ============================================================
       通用板块标题
    ============================================================ */
    .sec-header { text-align: center; margin-bottom: 40px; }
    .sec-eyebrow {
      display: inline-flex; align-items: center; gap: 10px;
      font-size: 11px; font-weight: 600; letter-spacing: 3px;
      color: var(--gold); text-transform: uppercase; margin-bottom: 14px;
    }
    .sec-eyebrow::before, .sec-eyebrow::after {
      content: ''; width: 24px; height: 1px; background: var(--gold);
    }
    .sec-title {
      font-family: 'Noto Serif SC', serif; font-size: clamp(28px, 4vw, 42px);
      font-weight: 700; color: var(--black); line-height: 1.2; margin-bottom: 14px;
    }
    .sec-desc { font-size: 15px; color: var(--text-mute); max-width: 560px; margin: 0 auto; line-height: 1.8; }

    /* ============================================================
       品牌简介 — 顶部无缝衔接 Hero
    ============================================================ */
    .intro {
      background: var(--white);
      position: relative;
      padding-top: 100px;
    }
    .intro::before {
      content: '';
      position: absolute; top: 0; left: 0; right: 0;
      height: 40px;
      background: linear-gradient(to bottom, rgba(17,17,16,0.06) 0%, transparent 100%);
      pointer-events: none;
    }
    .intro-grid {
      display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center;
    }
    .intro-text { }
    .intro-text .sec-eyebrow { justify-content: flex-start; }
    .intro-text .sec-eyebrow::before { display: none; }
    .intro-text .sec-title { text-align: left; }
    .intro-body p {
      font-size: 15px; color: var(--text-body); line-height: 2;
      margin-bottom: 16px; font-family: 'Noto Serif SC', serif;
    }
    .intro-body p:first-child { font-size: 15px; color: var(--black); }
    .intro-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 28px; }
    .intro-tag {
      padding: 6px 16px; background: var(--bg-warm);
      border: 1px solid var(--border); border-radius: 20px;
      font-size: 12px; color: var(--text-mute); letter-spacing: 0.5px;
    }
    .intro-tag.gold-tag {
      background: rgba(201,169,110,0.1); border-color: rgba(201,169,110,0.3);
      color: var(--gold-dark);
    }
    .intro-visual { }
    .intro-img {
      width: 100%;border-radius: var(--radius-lg);
      overflow: hidden; margin-bottom: 20px;
    }
    .intro-img-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
    .intro-img-sm { aspect-ratio: 1; border-radius: var(--radius-lg); overflow: hidden; }

    /* ============================================================
       品牌理念
    ============================================================ */
    .philosophy { background: var(--bg-warm); }
    .phil-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
    .phil-card {
      background: var(--white); border-radius: var(--radius-lg); overflow: hidden;
      box-shadow: var(--shadow-md); border: 1px solid rgba(0,0,0,0.04);
      transition: transform var(--trans), box-shadow var(--trans);
    }
    .phil-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
    .phil-top {
      padding: 48px 40px 40px; background: var(--black);
      position: relative; overflow: hidden;
    }
    .phil-top::before {
      content: ''; position: absolute; inset: 0;
      background: radial-gradient(ellipse 80% 80% at 30% 70%, rgba(201,169,110,0.1) 0%, transparent 70%);
    }
    .phil-num {
      font-family: 'Outfit', sans-serif; font-size: 72px; font-weight: 800;
      color: rgba(201,169,110,0.12); line-height: 1; margin-bottom: -12px;
    }
    .phil-en { font-size: 10px; color: var(--gold); letter-spacing: 4px; text-transform: uppercase; margin-bottom: 10px; }
    .phil-title { font-family: 'Noto Serif SC', serif; font-size: 26px; font-weight: 700; color: var(--white); margin-bottom: 12px; }
    .phil-quote {
      font-family: 'Noto Serif SC', serif; font-size: 14px; color: rgba(255,255,255,0.5);
      line-height: 1.8; border-left: 2px solid var(--gold); padding-left: 14px; font-style: italic;
    }
    .phil-body { padding: 32px 40px; }
    .phil-point { display: flex; align-items: flex-start; gap: 12px; margin-bottom: 14px; }
    .phil-point:last-child { margin-bottom: 0; }
    .phil-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--gold); flex-shrink: 0; margin-top: 7px; }
    .phil-point p { font-size: 13px; color: var(--text-body); line-height: 1.7; }

    /* ============================================================
       研发实力
    ============================================================ */
    .rd { background: var(--white); }
    .rd-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
    .rd-img { width: 100%; aspect-ratio: 3/2.5; border-radius: var(--radius-lg); overflow: hidden; }
    .rd-features { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
    .rd-feat {
      background: var(--bg-warm); border-radius: var(--radius-lg); padding: 28px 24px;
      border: 1px solid rgba(0,0,0,0.04); transition: transform var(--trans), box-shadow var(--trans);
    }
    .rd-feat:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--border); }
    .rd-feat-icon {
      width: 44px; height: 44px; background: rgba(201,169,110,0.1);
      border-radius: 10px; display: flex; align-items: center; justify-content: center; margin-bottom: 14px;
    }
    .rd-feat-icon svg { width: 22px; height: 22px; color: var(--gold-dark); }
    .rd-feat h4 { font-family: 'Noto Serif SC', serif; font-size: 15px; font-weight: 600; margin-bottom: 6px; }
    .rd-feat p { font-size: 12px; color: var(--text-mute); line-height: 1.7; }

    /* ============================================================
       生产基地
    ============================================================ */
    .factory { background: var(--black); }
    .factory .sec-title { color: var(--white); }
    .factory .sec-desc { color: rgba(255,255,255,0.4); }
    .factory-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
    .factory-card {
      background: rgba(255,255,255,0.04); border: 1px solid rgba(201,169,110,0.1);
      border-radius: var(--radius-lg); padding: 32px 20px; text-align: center;
      transition: all var(--trans);
    }
    .factory-card:hover {
      background: rgba(201,169,110,0.06);
      border-color: rgba(201,169,110,0.25);
      transform: translateY(-4px);
    }
    .factory-img { width: 64px; height: 64px; margin: 0 auto 20px; }
    .factory-card h4 { font-family: 'Noto Serif SC', serif; font-size: 16px; font-weight: 600; color: var(--white); margin-bottom: 8px; }
    .factory-card p { font-size: 12px; color: rgba(255,255,255,0.35); line-height: 1.7; }

    /* ============================================================
       资质认证
    ============================================================ */
    .cert { background: var(--bg-warm); }
    .cert-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-bottom: 24px; }
    .cert-badge {
      background: var(--white); border-radius: var(--radius-lg); padding: 36px 32px;
      box-shadow: var(--shadow-sm); border: 1px solid rgba(0,0,0,0.04);
      display: flex; gap: 24px; align-items: flex-start;
      transition: transform var(--trans), box-shadow var(--trans);
    }
    .cert-badge:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
    .cert-badge-icon {
      width: 68px; height: 68px; flex-shrink: 0;
      background: linear-gradient(135deg, rgba(201,169,110,0.15) 0%, rgba(201,169,110,0.05) 100%);
      border-radius: var(--radius-lg); display: flex; align-items: center; justify-content: center;
      border: 1px solid var(--border);
    }
    .cert-badge-icon svg { width: 34px; height: 34px; color: var(--gold-dark); }
    .cert-badge h4 { font-family: 'Noto Serif SC', serif; font-size: 18px; font-weight: 700; margin-bottom: 8px; }
    .cert-badge p { font-size: 13px; color: var(--text-mute); line-height: 1.8; }
    .cert-mini-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
    .cert-mini {
      background: var(--white); border: 1px solid rgba(0,0,0,0.05);
      border-radius: var(--radius-lg); padding: 20px 16px; text-align: center;
      transition: all var(--trans);
    }
    .cert-mini:hover { border-color: var(--border); box-shadow: var(--shadow-sm); }
    .cert-mini svg { width: 26px; height: 26px; color: var(--gold-dark); margin: 0 auto 10px; display: block; }
    .cert-mini h5 { font-size: 13px; font-weight: 600; margin-bottom: 4px; }
    .cert-mini p { font-size: 11px; color: var(--text-mute); }

    /* ============================================================
       CTA
    ============================================================ */
    .cta { background: var(--white); border-top: 1px solid rgba(0,0,0,0.06); }
    .cta-inner { max-width: 640px; margin: 0 auto; text-align: center; }
    .cta-form { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 40px; }
    .form-input {
      padding: 13px 18px; background: var(--bg-warm);
      border: 1px solid rgba(0,0,0,0.08); border-radius: var(--radius);
      font-size: 14px; font-family: inherit; color: var(--black);
      transition: all var(--trans); outline: none;
    }
    .form-input:focus { border-color: var(--gold); box-shadow: 0 0 0 3px rgba(201,169,110,0.12); }
    .form-input.full { grid-column: 1 / -1; }
    .form-submit {
      grid-column: 1 / -1; padding: 14px;
      background: var(--black); color: var(--white);
      font-size: 14px; font-weight: 600; font-family: inherit;
      border-radius: var(--radius); letter-spacing: 1px;
      transition: background var(--trans); cursor: pointer;
    }
    .form-submit:hover { background: var(--gold); }

    /* ============================================================
       FOOTER
    ============================================================ */
    .footer { background: var(--black); padding: 56px 0 40px; }
    .footer-inner { max-width: 1260px; margin: 0 auto; padding: 0 40px; }
    .footer-top {
      display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 60px;
      padding-bottom: 36px; border-bottom: 1px solid rgba(255,255,255,0.06);
      margin-bottom: 28px;
    }
    .footer-brand p { font-size: 12px; color: rgba(255,255,255,0.28); line-height: 1.9; margin-top: 10px; }
    .footer-col h5 { font-size: 11px; font-weight: 600; letter-spacing: 2px; color: var(--gold); text-transform: uppercase; margin-bottom: 14px; }
    .footer-col a { display: block; font-size: 13px; color: rgba(255,255,255,0.35); margin-bottom: 10px; transition: color var(--trans); }
    .footer-col a:hover { color: var(--gold-light); }
    .footer-bottom { display: flex; justify-content: space-between; align-items: center; }
    .footer-copy { font-size: 11px; color: rgba(255,255,255,0.2); }

    /* ============================================================
       动画
    ============================================================ */
    .reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.7s ease, transform 0.7s ease; }
    .reveal.visible { opacity: 1; transform: none; }
    .reveal-delay-1 { transition-delay: 0.1s; }
    .reveal-delay-2 { transition-delay: 0.2s; }
    .reveal-delay-3 { transition-delay: 0.3s; }
    .reveal-delay-4 { transition-delay: 0.4s; }

    /* ============================================================
       响应式
    ============================================================ */
    @media (max-width: 1024px) {
      .hero-grid, .intro-grid, .rd-grid { grid-template-columns: 1fr; gap: 48px; }
      .hero-right { display: none; }
      .factory-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-top { grid-template-columns: 1fr 1fr; gap: 32px; }
    }
    @media (max-width: 768px) {
      .section { padding: 72px 0; }
      .nav-inner { padding: 0 20px; }
      .nav-links, .nav-cta { display: none; }
      .hamburger { display: flex; }
      .hero { padding: 72px 0 0; }
      .hero-grid { padding: 80px 20px 60px; }
      .hero-stats { grid-template-columns: 1fr 1fr; gap: 12px; }
      .stat-card { padding: 18px 14px; }
      .stat-num { font-size: 30px; }
      .phil-cards { grid-template-columns: 1fr; }
      .rd-features { grid-template-columns: 1fr 1fr; }
      .cert-grid { grid-template-columns: 1fr; }
      .cert-mini-grid { grid-template-columns: repeat(2, 1fr); }
      .cta-form { grid-template-columns: 1fr; }
      .footer-top { grid-template-columns: 1fr; gap: 28px; }
      .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
    }
    @media (max-width: 480px) {
      .hero-stats { grid-template-columns: 1fr 1fr; }
      .factory-grid { grid-template-columns: 1fr; }
      .rd-features { grid-template-columns: 1fr; }
      .intro-img-wrap { grid-template-columns: 1fr; }
      .cert-badge { flex-direction: column; }
      .cert-badge-icon { margin: 0 auto; }
    }