/* ============================================================
   EduSmart 智慧教育 — 主样式表
   设计基调：白 + 深蓝(#0B1A2E) + 天蓝(#4A90D9) + 金色点缀
   风格：亮色与深色交替，专业科技，大留白
   ============================================================ */

/* ===== Web Font: Noto Sans SC (思源黑体) =====
   移除阻塞式 @import —— 在部分地区（如手机端）fonts.googleapis.com 不可达时，
   该 @import 会阻塞整个样式表加载，导致页面无样式、整体偏左。
   字体回退到系统中文字体（PingFang SC / 微软雅黑），排版不受影响。 */

/* ===== CSS Variables ===== */
:root {
  /* 主色系 */
  --deep-blue: #0B1A2E;
  --deep-blue-light: #132840;
  --sky-blue: #4A90D9;
  --sky-blue-dark: #3A7BC8;
  --sky-blue-light: #6BA8E8;
  --sky-blue-pale: #E8F1FB;
  --gold: #C9A84C;
  --gold-light: #D4BC6E;
  --gold-pale: #FBF6EA;

  /* 中性色 */
  --white: #FFFFFF;
  --bg-light: #F5F7FA;
  --bg-section-alt: #F0F3F7;
  --text-dark: #1A1A2E;
  --text-body: #3A4A5E;
  --text-medium: #5A6A7E;
  --text-light: #8A9AAD;
  --text-muted: #AAB5C0;
  --border: #E2E8F0;
  --border-light: #EDF1F6;

  /* 阴影 */
  --shadow-xs: 0 1px 2px rgba(11,26,46,0.04);
  --shadow-sm: 0 1px 3px rgba(11,26,46,0.06);
  --shadow-md: 0 4px 16px rgba(11,26,46,0.08);
  --shadow-lg: 0 8px 32px rgba(11,26,46,0.10);
  --shadow-xl: 0 16px 48px rgba(11,26,46,0.12);

  /* 圆角 */
  --radius-xs: 3px;
  --radius-sm: 6px;
  --radius: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* 字体 */
  --font: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;

  /* 尺寸 */
  --container: 1200px;
  --container-narrow: 900px;
  --header-h: 72px;
  --section-pad: 80px;
  --section-pad-sm: 48px;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body { font-family: var(--font); color: var(--text-body); line-height: 1.7; background: var(--white); overflow-x: hidden; }
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; transition: color 0.25s, background 0.25s; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, select, textarea { font-family: inherit; font-size: inherit; }
h1, h2, h3, h4, h5, h6 { color: var(--text-dark); line-height: 1.3; font-weight: 600; }

/* ===== Utility ===== */
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.container--narrow { max-width: var(--container-narrow); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

/* ===== Section ===== */
.section { padding: var(--section-pad) 0; }
.section--sm { padding: var(--section-pad-sm) 0; }
.section--dark { background: var(--deep-blue); color: rgba(255,255,255,0.85); }
.section--dark h2, .section--dark h3, .section--dark .section-tag { color: var(--white); }
.section--dark .section-subtitle { color: rgba(255,255,255,0.65); }
.section--light { background: var(--bg-light); }
.section--alt { background: var(--bg-section-alt); }

/* Section header */
.section-header { text-align: center; margin-bottom: 48px; }
.section-tag { display: inline-block; font-size: 0.8rem; font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase; color: var(--sky-blue); margin-bottom: 12px; }
.section-title { font-size: 2rem; font-weight: 700; color: var(--text-dark); margin-bottom: 12px; letter-spacing: -0.02em; }
.section-subtitle { font-size: 1rem; color: var(--text-medium); max-width: 600px; margin: 0 auto; }

/* ===== Header ===== */
.header { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; background: rgba(255,255,255,0.95); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); border-bottom: 1px solid var(--border-light); height: var(--header-h); transition: box-shadow 0.3s; }
.header--scrolled { box-shadow: var(--shadow-md); }
.header__inner { max-width: var(--container); margin: 0 auto; padding: 0 24px; height: 100%; display: flex; align-items: center; justify-content: space-between; }

/* Logo */
.header__logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.header__logo-icon { width: 40px; height: 40px; background: linear-gradient(135deg, var(--sky-blue), var(--deep-blue)); border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; color: var(--white); font-size: 1.1rem; }
.header__logo-text { display: flex; flex-direction: column; }
.header__logo-name { font-size: 1.15rem; font-weight: 700; color: var(--deep-blue); letter-spacing: -0.02em; line-height: 1.2; }
.header__logo-sub { font-size: 0.65rem; color: var(--text-light); letter-spacing: 0.06em; line-height: 1; }

/* Nav */
.header__nav { display: flex; align-items: center; gap: 4px; }
.header__nav-link { padding: 8px 14px; font-size: 0.9rem; font-weight: 500; color: var(--text-medium); border-radius: var(--radius-sm); position: relative; white-space: nowrap; transition: color 0.2s, background 0.2s; }
.header__nav-link:hover, .header__nav-link.active { color: var(--sky-blue); background: var(--sky-blue-pale); }

/* Dropdown */
.header__nav-item { position: relative; }
.header__dropdown { position: absolute; top: 100%; left: 50%; transform: translateX(-50%) translateY(8px); background: var(--white); border-radius: var(--radius); box-shadow: var(--shadow-xl); padding: 8px; min-width: 160px; opacity: 0; visibility: hidden; transition: all 0.25s; z-index: 60; border: 1px solid var(--border-light); }
.header__nav-item:hover .header__dropdown { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(4px); }
.header__dropdown a { display: block; padding: 10px 16px; font-size: 0.88rem; color: var(--text-medium); border-radius: var(--radius-xs); white-space: nowrap; transition: all 0.2s; }
.header__dropdown a:hover { background: var(--sky-blue-pale); color: var(--sky-blue); }

/* Header CTA */
.header__cta { display: inline-flex; align-items: center; gap: 6px; padding: 10px 20px; background: var(--sky-blue); color: var(--white); border-radius: var(--radius-sm); font-size: 0.85rem; font-weight: 600; white-space: nowrap; transition: background 0.25s, transform 0.2s; }
.header__cta:hover { background: var(--sky-blue-dark); color: var(--white); transform: translateY(-1px); }

/* Hamburger */
.hamburger { display: none; flex-direction: column; gap: 5px; padding: 8px; cursor: pointer; z-index: 1001; }
.hamburger span { display: block; width: 24px; height: 2px; background: var(--deep-blue); border-radius: 2px; transition: transform 0.3s, opacity 0.3s; }
.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile Nav */
.mobile-nav { position: fixed; top: 0; right: -320px; width: 300px; height: 100vh; background: var(--white); z-index: 1100; padding: 24px; overflow-y: auto; transition: right 0.35s cubic-bezier(0.4,0,0.2,1); box-shadow: var(--shadow-xl); }
.mobile-nav.active { right: 0; }
.mobile-nav__link { display: block; padding: 14px 16px; font-size: 0.95rem; color: var(--text-dark); border-radius: var(--radius-sm); border-bottom: 1px solid var(--border-light); transition: background 0.2s; }
.mobile-nav__link:hover { background: var(--sky-blue-pale); color: var(--sky-blue); }
.mobile-nav__sub { max-height: 0; overflow: hidden; transition: max-height 0.35s; padding-left: 16px; }
.mobile-nav__sub.open { max-height: 400px; }
.mobile-nav__sub a { display: block; padding: 10px 16px; font-size: 0.88rem; color: var(--text-medium); border-radius: var(--radius-xs); }
.mobile-nav__overlay { position: fixed; inset: 0; background: rgba(11,26,46,0.5); z-index: 1050; opacity: 0; visibility: hidden; transition: all 0.3s; }
.mobile-nav__overlay.active { opacity: 1; visibility: visible; }

/* ===== Hero / Banner ===== */
.hero { position: relative; height: 100vh; min-height: 600px; max-height: 800px; overflow: hidden; margin-top: var(--header-h); }
.hero .swiper, .hero .swiper-wrapper, .hero .swiper-slide { height: 100%; }
.hero__slide { width: 100%; height: 100%; background-size: cover; background-position: center; background-repeat: no-repeat; }
.hero__slide::after { content: ''; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(11,26,46,0.25) 0%, rgba(11,26,46,0.55) 100%); z-index: 1; }
.hero__content { position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%); z-index: 10; text-align: center; width: 90%; max-width: 800px; }
.hero__title { font-size: 3rem; font-weight: 800; color: var(--white); letter-spacing: -0.03em; line-height: 1.2; margin-bottom: 16px; text-shadow: 0 2px 20px rgba(0,0,0,0.3); }
.hero__subtitle { font-size: 1.15rem; color: rgba(255,255,255,0.88); margin-bottom: 36px; font-weight: 400; }
.hero__actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.hero__pagination { position: absolute; bottom: 32px; left: 50%; transform: translateX(-50%); z-index: 10; display: flex; gap: 10px; }
.hero__pagination .swiper-pagination-bullet { width: 10px; height: 10px; background: rgba(255,255,255,0.5); opacity: 1; transition: all 0.3s; }
.hero__pagination .swiper-pagination-bullet-active { background: var(--sky-blue); width: 28px; border-radius: 5px; }

/* ===== Buttons ===== */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 28px; font-size: 0.9rem; font-weight: 600; border-radius: var(--radius-sm); transition: all 0.25s; cursor: pointer; line-height: 1.4; }
.btn--primary { background: var(--sky-blue); color: var(--white); }
.btn--primary:hover { background: var(--sky-blue-dark); transform: translateY(-1px); box-shadow: 0 4px 16px rgba(74,144,217,0.35); color: var(--white); }
.btn--outline { background: transparent; color: var(--white); border: 2px solid rgba(255,255,255,0.8); }
.btn--outline:hover { background: var(--white); color: var(--deep-blue); border-color: var(--white); }
.btn--ghost { background: transparent; color: var(--sky-blue); border: 1px solid var(--border); }
.btn--ghost:hover { background: var(--sky-blue-pale); border-color: var(--sky-blue); }
.btn--dark { background: var(--deep-blue); color: var(--white); }
.btn--dark:hover { background: var(--deep-blue-light); transform: translateY(-1px); box-shadow: var(--shadow-md); color: var(--white); }
.btn--gold { background: var(--gold); color: var(--white); }
.btn--gold:hover { background: var(--gold-light); transform: translateY(-1px); color: var(--white); }
.btn--lg { padding: 15px 36px; font-size: 1rem; }
.btn--sm { padding: 8px 16px; font-size: 0.82rem; }

/* ===== Stats Counter ===== */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; text-align: center; }
.stat-item { padding: 24px; }
.stat-item__number { font-size: 2.8rem; font-weight: 800; color: var(--deep-blue); letter-spacing: -0.02em; margin-bottom: 8px; }
.stat-item__number span { display: inline; }
.stat-item__label { font-size: 0.9rem; color: var(--text-medium); font-weight: 500; }

/* ===== Cards ===== */
.card { background: var(--white); border-radius: var(--radius); overflow: hidden; transition: transform 0.3s, box-shadow 0.3s; border: 1px solid var(--border-light); display: flex; flex-direction: column; }
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--sky-blue-light); }
.card__image { position: relative; overflow: hidden; aspect-ratio: 16/10; background: var(--bg-section-alt); }
.card__image img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s; }
.card:hover .card__image img { transform: scale(1.05); }
.card__body { padding: 20px; flex: 1; display: flex; flex-direction: column; }
.card__tag { display: inline-block; font-size: 0.72rem; font-weight: 600; color: var(--sky-blue); background: var(--sky-blue-pale); padding: 3px 10px; border-radius: 20px; margin-bottom: 10px; align-self: flex-start; }
.card__title { font-size: 1.05rem; font-weight: 600; color: var(--text-dark); margin-bottom: 8px; line-height: 1.4; }
.card__desc { font-size: 0.88rem; color: var(--text-medium); line-height: 1.6; flex: 1; }
.card__meta { display: flex; gap: 16px; font-size: 0.8rem; color: var(--text-light); margin-top: 12px; }

/* Solution card variant */
.card--solution { border-left: 3px solid var(--sky-blue); padding: 0; }
.card--solution .card__body { padding: 28px 24px; }
.card--solution .card__icon { width: 56px; height: 56px; background: linear-gradient(135deg, var(--sky-blue-pale), var(--white)); border-radius: var(--radius); display: flex; align-items: center; justify-content: center; font-size: 1.5rem; color: var(--sky-blue); margin-bottom: 16px; }

/* Case card variant */
.card--case { text-align: center; }
.card--case .card__image { aspect-ratio: 1/1; display: flex; align-items: center; justify-content: center; background: var(--bg-light); padding: 32px; }
.card--case .card__image img { width: auto; max-height: 80px; object-fit: contain; }

/* Device card variant */
.card--device .card__meta-row { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.card--device .card__meta-tag { font-size: 0.72rem; padding: 4px 10px; background: var(--bg-light); color: var(--text-medium); border-radius: 20px; }

/* ===== Grids ===== */
.list-grid { display: grid; gap: 24px; }
.list-grid--2 { grid-template-columns: repeat(2, 1fr); }
.list-grid--3 { grid-template-columns: repeat(3, 1fr); }
.list-grid--4 { grid-template-columns: repeat(4, 1fr); }
.list-grid--5 { grid-template-columns: repeat(5, 1fr); }

/* ===== Features / Solution highlight ===== */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.feature-card { text-align: center; padding: 36px 24px; background: var(--white); border-radius: var(--radius); border: 1px solid var(--border-light); transition: transform 0.3s, box-shadow 0.3s; }
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.feature-card__icon { width: 64px; height: 64px; margin: 0 auto 20px; background: linear-gradient(135deg, var(--sky-blue-pale), #D8EAFA); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.6rem; color: var(--sky-blue); }
.feature-card__title { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; color: var(--deep-blue); }
.feature-card__desc { font-size: 0.9rem; color: var(--text-medium); line-height: 1.6; }

/* ===== Scene Showcase ===== */
.scene-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.scene-item { position: relative; border-radius: var(--radius); overflow: hidden; aspect-ratio: 4/3; cursor: pointer; }
.scene-item img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s; }
.scene-item:hover img { transform: scale(1.08); }
.scene-item__overlay { position: absolute; bottom: 0; left: 0; right: 0; padding: 20px; background: linear-gradient(transparent, rgba(11,26,46,0.8)); color: var(--white); }
.scene-item__title { font-size: 1rem; font-weight: 600; color: var(--white); }

/* ===== Research / News list ===== */
.article-item { display: flex; gap: 24px; padding: 24px 0; border-bottom: 1px solid var(--border-light); transition: padding 0.2s; }
.article-item:hover { background: var(--sky-blue-pale); margin: 0 -16px; padding-left: 16px; padding-right: 16px; border-radius: var(--radius-sm); border-bottom-color: transparent; }
.article-item__thumb { width: 200px; height: 140px; border-radius: var(--radius-sm); overflow: hidden; flex-shrink: 0; background: var(--bg-section-alt); }
.article-item__thumb img { width: 100%; height: 100%; object-fit: cover; }
.article-item__info { flex: 1; display: flex; flex-direction: column; }
.article-item__title { font-size: 1.1rem; font-weight: 600; color: var(--text-dark); margin-bottom: 8px; }
.article-item__date { font-size: 0.82rem; color: var(--text-light); margin-bottom: 8px; }
.article-item__desc { font-size: 0.88rem; color: var(--text-medium); line-height: 1.6; flex: 1; }

/* ===== Certifications ===== */
.cert-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; text-align: center; }
.cert-item { padding: 32px 16px; background: var(--white); border-radius: var(--radius); border: 1px solid var(--border-light); transition: transform 0.3s; }
.cert-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-sm); }
.cert-item__icon { font-size: 2.5rem; color: var(--gold); margin-bottom: 12px; }
.cert-item__title { font-size: 0.9rem; font-weight: 600; color: var(--text-dark); }

/* ===== CTA Section ===== */
.cta-section { background: linear-gradient(135deg, var(--sky-blue), var(--sky-blue-dark)); padding: 72px 0; text-align: center; position: relative; overflow: hidden; }
.cta-section::before { content: ''; position: absolute; inset: 0; background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E"); }
.cta-section .container { position: relative; z-index: 1; }
.cta-section h2 { color: var(--white); font-size: 2rem; margin-bottom: 12px; }
.cta-section p { color: rgba(255,255,255,0.85); font-size: 1rem; margin-bottom: 28px; }
.cta-section .btn--white { background: var(--white); color: var(--sky-blue); font-weight: 700; }
.cta-section .btn--white:hover { background: var(--deep-blue); color: var(--white); }
.cta-section .cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ===== Footer ===== */
.footer { background: var(--deep-blue); color: rgba(255,255,255,0.7); padding: 60px 0 0; }
.footer__grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.2fr; gap: 40px; max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.footer__brand-desc { font-size: 0.88rem; line-height: 1.7; margin-bottom: 20px; }
.footer__col-title { font-size: 1rem; font-weight: 600; color: var(--white); margin-bottom: 20px; padding-bottom: 10px; border-bottom: 2px solid var(--sky-blue); display: inline-block; }
.footer__links { display: flex; flex-direction: column; gap: 10px; }
.footer__links a { font-size: 0.88rem; color: rgba(255,255,255,0.65); transition: color 0.2s; }
.footer__links a:hover { color: var(--sky-blue-light); }
.footer__contact-item { display: flex; gap: 10px; align-items: flex-start; margin-bottom: 12px; font-size: 0.88rem; }
.footer__contact-item i { color: var(--sky-blue-light); margin-top: 4px; flex-shrink: 0; }
.footer__social { display: flex; gap: 10px; margin-top: 12px; }
.footer__social a { width: 36px; height: 36px; border-radius: 50%; background: rgba(255,255,255,0.08); display: flex; align-items: center; justify-content: center; font-size: 0.9rem; color: rgba(255,255,255,0.6); transition: all 0.25s; }
.footer__social a:hover { background: var(--sky-blue); color: var(--white); }
.footer__qrcode { width: 100px; height: 100px; background: var(--white); border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; font-size: 0.7rem; color: var(--text-muted); text-align: center; margin-top: 4px; }
.footer__bottom { border-top: 1px solid rgba(255,255,255,0.08); margin-top: 48px; padding: 20px 0; }
.footer__bottom-inner { max-width: var(--container); margin: 0 auto; padding: 0 24px; display: flex; justify-content: space-between; align-items: center; font-size: 0.82rem; flex-wrap: wrap; gap: 12px; }
.footer__bottom-inner a { color: rgba(255,255,255,0.5); }
.footer__bottom-inner a:hover { color: var(--sky-blue-light); }

/* Friend links */
.friend-links { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; padding: 20px 0; border-top: 1px solid rgba(255,255,255,0.08); margin-top: 20px; }
.friend-links__label { font-size: 0.82rem; color: rgba(255,255,255,0.5); flex-shrink: 0; }
.friend-links a { font-size: 0.78rem; color: rgba(255,255,255,0.4); padding: 4px 10px; border-radius: 20px; transition: all 0.2s; }
.friend-links a:hover { color: var(--sky-blue-light); background: rgba(255,255,255,0.05); }

/* ===== Inner Page Banner ===== */
.inner-banner { position: relative; height: 320px; overflow: hidden; margin-top: var(--header-h); }
.inner-banner__bg { position: absolute; inset: 0; background-size: cover; background-position: center; }
.inner-banner__bg::after { content: ''; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(11,26,46,0.55) 0%, rgba(11,26,46,0.75) 100%); }
.inner-banner__content { position: absolute; bottom: 40px; left: 50%; transform: translateX(-50%); text-align: center; z-index: 1; width: 90%; }
.inner-banner__title { font-size: 2.2rem; font-weight: 700; color: var(--white); margin-bottom: 8px; letter-spacing: -0.02em; }
.inner-banner__subtitle { font-size: 1rem; color: rgba(255,255,255,0.75); }

/* Breadcrumb */
.breadcrumb-bar { background: var(--white); border-bottom: 1px solid var(--border-light); padding: 12px 0; position: sticky; top: var(--header-h); z-index: 50; }
.breadcrumb { max-width: var(--container); margin: 0 auto; padding: 0 24px; font-size: 0.85rem; color: var(--text-light); }
.breadcrumb a { color: var(--text-medium); }
.breadcrumb a:hover { color: var(--sky-blue); }
.breadcrumb i, .breadcrumb .fa-solid { font-size: 0.6rem; margin: 0 6px; }

/* ===== Filter Bar (sub-category tabs) ===== */
.filter-bar { display: flex; gap: 4px; padding: 16px 0; flex-wrap: wrap; }
.filter-bar a { padding: 8px 20px; font-size: 0.88rem; font-weight: 500; color: var(--text-medium); border-radius: 20px; transition: all 0.2s; border: 1px solid var(--border); }
.filter-bar a:hover, .filter-bar a.active { color: var(--sky-blue); border-color: var(--sky-blue); background: var(--sky-blue-pale); }

/* ===== Pagination ===== */
.pagination { display: flex; justify-content: center; gap: 6px; margin-top: 40px; }
.pagination a { width: 40px; height: 40px; display: flex; align-items: center; justify-content: center; border: 1px solid var(--border); border-radius: var(--radius-sm); font-size: 0.85rem; color: var(--text-medium); transition: all 0.2s; }
.pagination a:hover, .pagination a.active { background: var(--sky-blue); color: var(--white); border-color: var(--sky-blue); }
.pagination a.active { font-weight: 600; }

/* ===== Empty State ===== */
.empty-state { text-align: center; padding: 60px 0; color: var(--text-light); }
.empty-state i { font-size: 3rem; color: var(--border); margin-bottom: 16px; display: block; }
.empty-state p { font-size: 0.95rem; }

/* ===== Detail Page ===== */
.detail { max-width: var(--container-narrow); margin: 0 auto; }
.detail__header { padding: 32px 0 24px; border-bottom: 1px solid var(--border-light); margin-bottom: 24px; }
.detail__title { font-size: 1.6rem; font-weight: 700; color: var(--text-dark); margin-bottom: 12px; }
.detail__meta-row { display: flex; gap: 20px; flex-wrap: wrap; font-size: 0.85rem; color: var(--text-light); }
.detail__meta-row i { margin-right: 4px; }
.detail__params { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin: 24px 0; }
.detail__param { text-align: center; padding: 16px; background: var(--bg-light); border-radius: var(--radius-sm); }
.detail__param-label { font-size: 0.75rem; color: var(--text-light); margin-bottom: 4px; text-transform: uppercase; letter-spacing: 0.05em; }
.detail__param-value { font-size: 1.1rem; font-weight: 700; color: var(--deep-blue); }
.detail__body { font-size: 0.95rem; line-height: 1.85; color: var(--text-body); }
.detail__body img { border-radius: var(--radius); margin: 20px 0; }
.detail__body p { margin-bottom: 16px; }
.detail__body h2, .detail__body h3 { margin: 32px 0 12px; }
.detail__pager { display: flex; justify-content: space-between; align-items: center; padding: 24px 0; margin-top: 40px; border-top: 1px solid var(--border); font-size: 0.88rem; color: var(--text-medium); }
.detail__pager a:hover { color: var(--sky-blue); }

/* ===== Tabs ===== */
.tabs { display: flex; gap: 0; border-bottom: 2px solid var(--border); margin-bottom: 32px; }
.tab-btn { padding: 12px 24px; font-size: 0.9rem; font-weight: 500; color: var(--text-medium); border-bottom: 2px solid transparent; margin-bottom: -2px; transition: all 0.2s; cursor: pointer; }
.tab-btn:hover { color: var(--sky-blue); }
.tab-btn.active { color: var(--sky-blue); border-bottom-color: var(--sky-blue); font-weight: 600; }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* Related */
.related-title { font-size: 1.2rem; font-weight: 600; margin: 48px 0 24px; padding-top: 32px; border-top: 1px solid var(--border); }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }

/* ===== Contact Page ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.contact-info__item { display: flex; gap: 16px; padding: 20px 0; border-bottom: 1px solid var(--border-light); }
.contact-info__icon { width: 48px; height: 48px; background: var(--sky-blue-pale); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.1rem; color: var(--sky-blue); flex-shrink: 0; }
.contact-info__label { font-size: 0.78rem; color: var(--text-light); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 4px; }
.contact-info__value { font-size: 0.95rem; color: var(--text-dark); font-weight: 500; }

/* Contact Form Card */
.contact-form-card { background: var(--white); padding: 36px; border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); border: 1px solid var(--border-light); }

/* ===== Form ===== */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 0.85rem; font-weight: 500; color: var(--text-dark); margin-bottom: 6px; }
.form-group .required { color: #E05050; }
.form-control { width: 100%; padding: 12px 16px; border: 1px solid var(--border); border-radius: var(--radius-sm); font-size: 0.9rem; color: var(--text-dark); background: var(--white); transition: border-color 0.2s, box-shadow 0.2s; outline: none; }
.form-control:focus { border-color: var(--sky-blue); box-shadow: 0 0 0 3px rgba(74,144,217,0.12); }
.form-control::placeholder { color: var(--text-muted); }
textarea.form-control { resize: vertical; min-height: 100px; }
select.form-control { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M6 8L1 3h10z' fill='%238A9AAD'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 14px center; padding-right: 36px; }

/* ===== Search ===== */
.search-box { max-width: 640px; margin: 0 auto; }
.search-form-row { display: flex; gap: 12px; }
.search-input-wrap { flex: 1; position: relative; }
.search-input-wrap i { position: absolute; left: 16px; top: 50%; transform: translateY(-50%); color: var(--text-muted); font-size: 0.95rem; }
.search-input-wrap input { width: 100%; padding: 14px 16px 14px 44px; border: 1px solid var(--border); border-radius: var(--radius); font-size: 0.95rem; outline: none; transition: border-color 0.2s, box-shadow 0.2s; }
.search-input-wrap input:focus { border-color: var(--sky-blue); box-shadow: 0 0 0 3px rgba(74,144,217,0.1); }

/* Search result item */
.search-result-item { display: flex; gap: 20px; padding: 20px 0; border-bottom: 1px solid var(--border-light); transition: background 0.2s; }
.search-result-item:hover { background: var(--sky-blue-pale); margin: 0 -16px; padding-left: 16px; padding-right: 16px; border-radius: var(--radius-sm); }
.search-result-item__thumb { width: 120px; height: 90px; border-radius: var(--radius-sm); overflow: hidden; flex-shrink: 0; background: var(--bg-section-alt); }
.search-result-item__thumb img { width: 100%; height: 100%; object-fit: cover; }
.search-result-item__info { flex: 1; }
.search-result-item__title { font-size: 1rem; font-weight: 600; color: var(--text-dark); margin-bottom: 4px; }
.search-result-item__date { font-size: 0.78rem; color: var(--text-light); margin-bottom: 4px; }
.search-result-item__desc { font-size: 0.85rem; color: var(--text-medium); line-height: 1.5; }

/* ===== Sidebar (inner pages) ===== */
.page-layout { display: grid; grid-template-columns: 260px 1fr; gap: 40px; }
.sidebar { background: var(--white); border-radius: var(--radius); border: 1px solid var(--border-light); overflow: hidden; }
.sidebar__title { padding: 20px; background: var(--deep-blue); color: var(--white); font-size: 1.05rem; font-weight: 600; }
.sidebar__nav a { display: block; padding: 14px 20px; font-size: 0.9rem; color: var(--text-medium); border-bottom: 1px solid var(--border-light); transition: all 0.2s; position: relative; }
.sidebar__nav a::before { content: ''; position: absolute; left: 0; top: 50%; transform: translateY(-50%); width: 3px; height: 0; background: var(--sky-blue); border-radius: 0 2px 2px 0; transition: height 0.25s; }
.sidebar__nav a:hover, .sidebar__nav a.active { color: var(--sky-blue); background: var(--sky-blue-pale); }
.sidebar__nav a.active::before { height: 20px; }

/* ===== Back to Top ===== */
.back-top { position: fixed; bottom: 32px; right: 32px; width: 44px; height: 44px; border-radius: 50%; background: var(--sky-blue); color: var(--white); display: flex; align-items: center; justify-content: center; font-size: 1rem; box-shadow: var(--shadow-md); z-index: 900; opacity: 0; visibility: hidden; transform: translateY(12px); transition: all 0.3s; }
.back-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { background: var(--deep-blue); transform: translateY(-2px); }

/* ===== Online Service ===== */
.online-service { position: fixed; bottom: 120px; right: 32px; z-index: 900; display: flex; flex-direction: column; gap: 10px; }
.online-service__btn { width: 44px; height: 44px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.1rem; color: var(--white); box-shadow: var(--shadow-md); transition: all 0.25s; position: relative; }
.online-service__btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.online-service__btn--tel { background: var(--sky-blue); }
.online-service__btn--wechat { background: #07C160; }
.online-service__btn--top { background: var(--deep-blue); }
.online-service__btn .tooltip { position: absolute; right: 56px; background: var(--text-dark); color: var(--white); padding: 6px 14px; border-radius: var(--radius-xs); font-size: 0.78rem; white-space: nowrap; opacity: 0; visibility: hidden; transition: all 0.2s; pointer-events: none; }
.online-service__btn:hover .tooltip { opacity: 1; visibility: visible; }

/* ===== Number Counter Animation ===== */
.countup { display: inline-block; }

/* ===== Scroll Indicator ===== */
.scroll-indicator { position: absolute; bottom: 32px; left: 50%; transform: translateX(-50%); z-index: 10; display: flex; flex-direction: column; align-items: center; gap: 8px; }
.scroll-indicator span { font-size: 0.7rem; letter-spacing: 0.15em; color: rgba(255,255,255,0.6); text-transform: uppercase; }
.scroll-indicator__line { width: 1px; height: 40px; background: linear-gradient(rgba(255,255,255,0.5), transparent); }

/* ===== Placeholder images ===== */
.img-placeholder { display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, #E8F1FB 0%, #D0E4F8 50%, #E8F1FB 100%); color: var(--sky-blue); font-size: 2rem; width: 100%; height: 100%; min-height: 200px; }
.img-placeholder--dark { background: linear-gradient(135deg, #1A2E44 0%, #0B1A2E 50%, #132840 100%); color: var(--sky-blue-light); }

/* ===== Modals ===== */
.modal { position: fixed; inset: 0; z-index: 2000; display: none; align-items: center; justify-content: center; }
.modal.active { display: flex; }
.modal__overlay { position: absolute; inset: 0; background: rgba(11,26,46,0.6); }
.modal__content { position: relative; background: var(--white); border-radius: var(--radius-lg); padding: 40px; max-width: 500px; width: 90%; max-height: 90vh; overflow-y: auto; z-index: 1; }
.modal__close { position: absolute; top: 16px; right: 16px; width: 32px; height: 32px; border-radius: 50%; background: var(--bg-light); display: flex; align-items: center; justify-content: center; font-size: 0.9rem; color: var(--text-medium); transition: all 0.2s; }
.modal__close:hover { background: #FEE; color: #E05050; }

/* ===== Animations ===== */
@keyframes fadeInUp { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes pulse { 0%, 100% { box-shadow: 0 0 0 0 rgba(74,144,217,0.4); } 50% { box-shadow: 0 0 0 12px rgba(74,144,217,0); } }
@keyframes shimmer { 0% { background-position: -200% 0; } 100% { background-position: 200% 0; } }

.animate-fade-in { animation: fadeIn 0.6s ease both; }
.pulse { animation: pulse 2.5s infinite; }

/* Lazy load placeholder shimmer */
.lazy-img { background: linear-gradient(90deg, var(--bg-section-alt) 25%, var(--border-light) 50%, var(--bg-section-alt) 75%); background-size: 200% 100%; animation: shimmer 1.5s infinite; }
.lazy-img.loaded { animation: none; background: none; }

/* ================================================================
   RESPONSIVE — 768px breakpoint
   ================================================================ */
@media (max-width: 1024px) {
  :root { --section-pad: 60px; --section-pad-sm: 36px; }
  .header__nav { display: none; }
  .header__cta { display: none; }
  .hamburger { display: flex; }

  .hero__title { font-size: 2rem; }
  .hero__subtitle { font-size: 1rem; }

  .stats { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .stat-item__number { font-size: 2.2rem; }

  .features { grid-template-columns: repeat(2, 1fr); gap: 20px; }

  .list-grid--5 { grid-template-columns: repeat(3, 1fr); }
  .list-grid--4 { grid-template-columns: repeat(2, 1fr); }
  .list-grid--3 { grid-template-columns: repeat(2, 1fr); }

  .scene-grid { grid-template-columns: repeat(2, 1fr); }
  .cert-grid { grid-template-columns: repeat(3, 1fr); }

  .footer__grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }

  .contact-grid { grid-template-columns: 1fr; }
  .page-layout { grid-template-columns: 1fr; }
  .sidebar { margin-bottom: 24px; }

  .detail__params { grid-template-columns: repeat(2, 1fr); }

  .inner-banner { height: 240px; }
  .inner-banner__title { font-size: 1.6rem; }

  .article-item { flex-direction: column; }
  .article-item__thumb { width: 100%; height: 180px; }
}

@media (max-width: 768px) {
  :root { --section-pad: 48px; --section-pad-sm: 28px; --header-h: 60px; }

  .hero { height: 70vh; min-height: 440px; }
  .hero__title { font-size: 1.6rem; }
  .hero__actions { flex-direction: column; align-items: center; }

  .section-title { font-size: 1.5rem; }
  .features { grid-template-columns: 1fr; }
  .list-grid--5, .list-grid--4, .list-grid--3, .list-grid--2 { grid-template-columns: 1fr; }
  .card--solution .card__body { padding: 16px 14px; }
  .card--solution .card__icon { width: 40px; height: 40px; font-size: 1.05rem; margin-bottom: 10px; }
  .card--solution .card__title { font-size: 0.95rem; margin-bottom: 4px; }
  .card--solution .card__desc { font-size: 0.8rem; }
  .card--solution .card__tag { margin-bottom: 4px; }
  .list-grid--devices { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .card--device .card__image { aspect-ratio: 16/9; }
  .card--device .card__body { padding: 12px 10px; }
  .card--device .card__title { font-size: 0.9rem; margin-bottom: 4px; }
  .card--device .card__desc { font-size: 0.75rem; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
  .card--device .card__meta-row { margin-top: 6px; }
  .card--device .card__meta-tag { font-size: 0.65rem; padding: 2px 8px; }
  .list-grid--case { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .card--case .card__image { aspect-ratio: 16/10; padding: 12px; }
  .card--case .card__image img { max-height: 96px; max-width: 100%; width: auto; height: auto; }
  .card--case .card__body { padding: 12px 10px; }
  .card--case .card__title { font-size: 0.9rem; margin-bottom: 4px; }
  .card--case .card__desc { font-size: 0.75rem; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
  .list-grid--casepage .card__image { aspect-ratio: 4/3; }
  .list-grid--casepage .card__image img { max-height: 104px; }
  .list-grid--news { grid-template-columns: 1fr; gap: 14px; }
  .list-grid--news .card__image { aspect-ratio: 16/9; }
  .list-grid--news .card__body { padding: 12px 14px; }
  .list-grid--news .card__title { font-size: 0.95rem; margin-bottom: 4px; }
  .list-grid--news .card__desc { font-size: 0.8rem; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
  .article-item { gap: 12px; padding: 14px 0; }
  .article-item__thumb { height: 110px; }
  .article-item__title { font-size: 0.98rem; margin-bottom: 5px; }
  .article-item__date { font-size: 0.75rem; margin-bottom: 5px; }
  .article-item__desc { font-size: 0.8rem; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
  .stats { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .stat-item { padding: 14px 10px; }
  .stat-item__number { font-size: 1.9rem; margin-bottom: 4px; }
  .stat-item__label { font-size: 0.82rem; }
  .scene-grid { grid-template-columns: 1fr 1fr; }
  .cert-grid { grid-template-columns: repeat(3, 1fr); gap: 12px; }
  .cert-item { padding: 14px 6px; }
  .cert-item__icon { font-size: 1.8rem; margin-bottom: 6px; }
  .cert-item__title { font-size: 0.72rem; }

  .footer__grid { grid-template-columns: 1fr; gap: 28px; }
  .footer__links { flex-direction: row; flex-wrap: wrap; gap: 8px 20px; }
  .footer__bottom-inner { flex-direction: column; text-align: center; }

  .detail__params { grid-template-columns: 1fr; }
  .search-form-row { flex-direction: column; }
  .search-result-item { flex-direction: column; }
  .search-result-item__thumb { width: 100%; height: 160px; }
  .related-grid { grid-template-columns: 1fr; }

  .contact-form-card { padding: 24px; }

  .tabs { overflow-x: auto; flex-wrap: nowrap; }
  .tab-btn { white-space: nowrap; flex-shrink: 0; }

  .back-top { bottom: 20px; right: 20px; }
  .online-service { bottom: 100px; right: 20px; }
}

@media (max-width: 480px) {
  .hero__title { font-size: 1.35rem; }
  .hero__subtitle { font-size: 0.88rem; }
  .section-title { font-size: 1.3rem; }
  .inner-banner { height: 200px; }
  .inner-banner__title { font-size: 1.3rem; }
  .stats { grid-template-columns: 1fr 1fr; gap: 8px; }
  .card--solution .card__body { padding: 14px 12px; }
  .card--solution .card__icon { width: 34px; height: 34px; font-size: 0.95rem; margin-bottom: 8px; }
  .list-grid--devices { gap: 8px; }
  .card--device .card__body { padding: 10px 8px; }
  .card--device .card__title { font-size: 0.85rem; }
  .card--device .card__desc { font-size: 0.7rem; }
  .list-grid--case { gap: 8px; }
  .card--case .card__image { padding: 8px; }
  .card--case .card__image img { max-height: 84px; }
  .list-grid--casepage .card__image img { max-height: 96px; }
  .card--case .card__body { padding: 10px 8px; }
  .card--case .card__title { font-size: 0.85rem; }
  .card--case .card__desc { font-size: 0.7rem; }
  .list-grid--news { gap: 12px; }
  .list-grid--news .card__body { padding: 10px 12px; }
  .list-grid--news .card__title { font-size: 0.9rem; }
  .list-grid--news .card__desc { font-size: 0.75rem; }
  .article-item { padding: 12px 0; }
  .article-item__thumb { height: 96px; }
  .article-item__title { font-size: 0.92rem; }
  .article-item__desc { font-size: 0.75rem; }
  .stat-item { padding: 10px 6px; }
  .stat-item__number { font-size: 1.5rem; margin-bottom: 2px; }
  .stat-item__label { font-size: 0.75rem; }
  .cert-grid { gap: 8px; }
  .cert-item { padding: 12px 4px; }
  .cert-item__icon { font-size: 1.6rem; margin-bottom: 4px; }
  .cert-item__title { font-size: 0.68rem; }
  .footer__links { gap: 8px 14px; }
}