/* ==========================================================================
   极速云 (jisu-yun.my) - 瑞士国际主义排版风格样式表 (Swiss International Style)
   纯手写 CSS + CSS 自定义属性规范
   严格规范：无渐变、无阴影、无圆角 (border-radius: 0)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Archivo:wght@800;900&family=Noto+Sans+SC:wght@400;500;700;900&display=swap');

:root {
  --bg-paper: #FAFAF7;
  --color-ink: #121212;
  --color-ink-sub: #4A4A4A;
  --color-ink-muted: #7E7E7E;
  --color-blue: #0A3DFF;
  --color-blue-hover: #002BD6;
  --color-light-cell: #F3F3F0;
  --border-width: 1.5px;
  --border-color: #121212;
  --font-display: 'Archivo', -apple-system, sans-serif;
  --font-body: 'Noto Sans SC', -apple-system, sans-serif;
  --container-max: 1240px;
}

/* 强制清除全局所有圆角与阴影 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  border-radius: 0 !important;
  box-shadow: none !important;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--bg-paper);
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-paper);
  color: var(--color-ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* 顶部固定极细电光蓝进度条 */
#scrollProgress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background-color: var(--color-blue);
  width: 0%;
  z-index: 9999;
  transition: width 0.08s ease-out;
}

/* 通用容器与栅格 */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* 排版层级规范 */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-ink);
  font-weight: 900;
  line-height: 1.15;
}

.font-display {
  font-family: var(--font-display);
}

.lead-p {
  font-size: 1.15rem;
  color: var(--color-ink-sub);
  line-height: 1.8;
}

/* 编号与分区眉题 (01 / 02 / 03 / 04) */
.section-tag {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 900;
  letter-spacing: 0.15em;
  color: var(--color-blue);
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.section-tag::after {
  content: "";
  display: block;
  flex: 1;
  height: var(--border-width);
  background-color: var(--border-color);
  max-width: 60px;
}

/* 结构性通用线框 */
.border-all {
  border: var(--border-width) solid var(--border-color);
}
.border-top-only {
  border-top: var(--border-width) solid var(--border-color);
}
.border-bottom-only {
  border-bottom: var(--border-width) solid var(--border-color);
}

/* 吸顶结构带框导航 */
.swiss-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--bg-paper);
  border-bottom: var(--border-width) solid var(--border-color);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-wrap {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--color-ink);
}

.brand-name {
  font-family: var(--font-body);
  font-size: 1.4rem;
  font-weight: 900;
  letter-spacing: -0.03em;
}

.brand-swiss-badge {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 900;
  color: #FFFFFF;
  background-color: var(--color-blue);
  padding: 2px 6px;
  letter-spacing: 0.08em;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
  align-items: center;
}

.nav-links a {
  text-decoration: none;
  color: var(--color-ink);
  font-size: 0.95rem;
  font-weight: 700;
  padding: 0.4rem 0;
  position: relative;
  transition: color 0.15s ease;
}

.nav-links a:hover {
  color: var(--color-blue);
}

.nav-links a.nav-highlight {
  color: var(--color-blue);
  border-bottom: 2px solid var(--color-blue);
}

.nav-cta-btn {
  display: inline-block;
  background-color: var(--color-ink);
  color: #FFFFFF;
  text-decoration: none;
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0.65rem 1.4rem;
  border: var(--border-width) solid var(--border-color);
  transition: background-color 0.15s ease, color 0.15s ease;
}

.nav-cta-btn:hover {
  background-color: var(--color-blue);
  border-color: var(--color-blue);
  color: #FFFFFF;
}

/* 按钮规范 */
.btn-swiss-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-blue);
  color: #FFFFFF;
  text-decoration: none;
  font-weight: 800;
  font-size: 1.05rem;
  padding: 1rem 2rem;
  border: var(--border-width) solid var(--color-blue);
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

.btn-swiss-primary:hover {
  background-color: var(--color-blue-hover);
  border-color: var(--color-blue-hover);
}

.btn-swiss-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: transparent;
  color: var(--color-ink);
  text-decoration: none;
  font-weight: 800;
  font-size: 1.05rem;
  padding: 1rem 2rem;
  border: var(--border-width) solid var(--border-color);
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.btn-swiss-secondary:hover {
  background-color: var(--color-ink);
  color: #FFFFFF;
}

/* Hero 巨型排版主视觉区 */
.hero-section {
  padding: 4.5rem 0 3.5rem;
  border-bottom: var(--border-width) solid var(--border-color);
}

.hero-meta-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 1.5rem;
  border-bottom: var(--border-width) solid var(--border-color);
  margin-bottom: 2.5rem;
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--color-ink-muted);
  letter-spacing: 0.08em;
}

.hero-title-giant {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 7.8vw, 6.8rem);
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: -0.04em;
  text-transform: uppercase;
  color: var(--color-ink);
  margin-bottom: 1.5rem;
}

.hero-subtitle-chinese {
  font-size: clamp(1.4rem, 2.5vw, 2.2rem);
  font-weight: 900;
  line-height: 1.35;
  color: var(--color-ink);
  margin-bottom: 1.8rem;
}

.hero-intro {
  font-size: 1.15rem;
  color: var(--color-ink-sub);
  max-width: 820px;
  line-height: 1.85;
  margin-bottom: 2.5rem;
}

.hero-actions {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
  align-items: center;
}

/* 四格带框数据条 (Four-cell framed data bar) */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-bottom: var(--border-width) solid var(--border-color);
  background-color: var(--bg-paper);
}

.stat-cell {
  padding: 2.2rem 1.8rem;
  border-right: var(--border-width) solid var(--border-color);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.stat-cell:last-child {
  border-right: none;
}

.stat-num-label {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--color-blue);
  letter-spacing: 0.12em;
  margin-bottom: 0.75rem;
}

.stat-value {
  font-family: var(--font-display);
  font-size: 2.8rem;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--color-ink);
  margin-bottom: 0.5rem;
}

.stat-desc {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-ink-sub);
  line-height: 1.5;
}

/* 核心优势 3x2 功能网格 (Hover 反色为黑底) */
.section-features {
  padding: 4.5rem 0;
  border-bottom: var(--border-width) solid var(--border-color);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: var(--border-width) solid var(--border-color);
  border-left: var(--border-width) solid var(--border-color);
  margin-top: 2rem;
}

.feature-cell {
  padding: 2.5rem 2rem;
  border-right: var(--border-width) solid var(--border-color);
  border-bottom: var(--border-width) solid var(--border-color);
  background-color: var(--bg-paper);
  transition: background-color 0.2s ease, color 0.2s ease;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 280px;
}

.feature-cell:hover {
  background-color: var(--color-ink);
  color: #FFFFFF;
}

.feature-cell:hover h3 {
  color: #FFFFFF;
}

.feature-cell:hover p {
  color: #CCCCCC;
}

.feature-cell:hover .feature-index {
  color: var(--color-blue);
}

.feature-index {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--color-ink-muted);
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
  transition: color 0.2s ease;
}

.feature-cell h3 {
  font-size: 1.35rem;
  margin-bottom: 0.85rem;
  transition: color 0.2s ease;
}

.feature-cell p {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-ink-sub);
  transition: color 0.2s ease;
}

/* 流媒体与 AI 支持矩阵 */
.section-media {
  padding: 4.5rem 0;
  border-bottom: var(--border-width) solid var(--border-color);
}

.media-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: var(--border-width) solid var(--border-color);
  border-left: var(--border-width) solid var(--border-color);
  margin-top: 2rem;
}

.media-cell {
  padding: 1.8rem;
  border-right: var(--border-width) solid var(--border-color);
  border-bottom: var(--border-width) solid var(--border-color);
  background-color: var(--bg-paper);
}

.media-cell .badge-status {
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 800;
  color: #FFFFFF;
  background-color: var(--color-blue);
  padding: 2px 6px;
  display: inline-block;
  margin-bottom: 0.75rem;
}

.media-cell h4 {
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
}

.media-cell p {
  font-size: 0.88rem;
  color: var(--color-ink-sub);
  line-height: 1.6;
}

/* 带框三列定价表 (其中一档反色为深色主推) */
.section-pricing {
  padding: 4.5rem 0;
  border-bottom: var(--border-width) solid var(--border-color);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: var(--border-width) solid var(--border-color);
  margin-top: 2.5rem;
}

.pricing-card {
  padding: 3rem 2.2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background-color: var(--bg-paper);
  border-right: var(--border-width) solid var(--border-color);
}

.pricing-card:last-child {
  border-right: none;
}

/* 主推方案：反色为纯黑底色配电光蓝 */
.pricing-card.featured {
  background-color: var(--color-ink);
  color: #FFFFFF;
}

.pricing-card.featured h3,
.pricing-card.featured .price-amount,
.pricing-card.featured .plan-sub {
  color: #FFFFFF;
}

.pricing-card.featured .feature-list li {
  color: #E0E0E0;
  border-bottom-color: rgba(255,255,255,0.15);
}

.pricing-card.featured .feature-list li::before {
  color: var(--color-blue);
}

.plan-label {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--color-blue);
  text-transform: uppercase;
  margin-bottom: 0.6rem;
}

.pricing-card h3 {
  font-size: 1.6rem;
  margin-bottom: 0.4rem;
}

.plan-sub {
  font-size: 0.9rem;
  color: var(--color-ink-sub);
  margin-bottom: 1.8rem;
}

.price-wrap {
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
  margin-bottom: 2rem;
}

.price-currency {
  font-size: 1.4rem;
  font-weight: 800;
}

.price-amount {
  font-family: var(--font-display);
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 0.9;
  letter-spacing: -0.04em;
}

.price-period {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-ink-muted);
}

.feature-list {
  list-style: none;
  margin-bottom: 2.5rem;
}

.feature-list li {
  padding: 0.75rem 0;
  border-bottom: 1px solid rgba(0,0,0,0.08);
  font-size: 0.92rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.feature-list li::before {
  content: "■";
  color: var(--color-blue);
  font-size: 0.75rem;
}

/* 用户评价系统 */
.section-reviews {
  padding: 4.5rem 0;
  border-bottom: var(--border-width) solid var(--border-color);
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: var(--border-width) solid var(--border-color);
  border-left: var(--border-width) solid var(--border-color);
  margin-top: 2rem;
}

.review-cell {
  padding: 2.2rem;
  border-right: var(--border-width) solid var(--border-color);
  border-bottom: var(--border-width) solid var(--border-color);
  background-color: var(--bg-paper);
}

.review-score {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 800;
  color: var(--color-blue);
  letter-spacing: 0.08em;
  margin-bottom: 0.75rem;
}

.review-text {
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--color-ink-sub);
  margin-bottom: 1.25rem;
}

.review-author {
  font-weight: 700;
  font-size: 0.88rem;
  color: var(--color-ink);
}

/* <details> 极简 FAQ 行 */
.section-faq {
  padding: 4.5rem 0;
  border-bottom: var(--border-width) solid var(--border-color);
}

.faq-container {
  max-width: 960px;
  margin: 2rem auto 0;
  border-top: var(--border-width) solid var(--border-color);
}

details {
  border-bottom: var(--border-width) solid var(--border-color);
  padding: 1.4rem 0;
  transition: background-color 0.15s ease;
}

details[open] {
  background-color: var(--color-light-cell);
  padding: 1.4rem 1.2rem;
}

summary {
  font-size: 1.15rem;
  font-weight: 800;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: "+";
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--color-blue);
  transition: transform 0.15s ease;
}

details[open] summary::after {
  content: "−";
}

.faq-answer {
  padding-top: 1rem;
  font-size: 0.98rem;
  color: var(--color-ink-sub);
  line-height: 1.85;
}

/* 通栏粗体电光蓝 CTA 色块 */
.section-cta-banner {
  background-color: var(--color-blue);
  color: #FFFFFF;
  padding: 5rem 0;
  border-bottom: var(--border-width) solid var(--border-color);
  text-align: center;
}

.cta-banner-title {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 5vw, 4.2rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.03em;
  text-transform: uppercase;
  color: #FFFFFF;
  margin-bottom: 1.25rem;
}

.cta-banner-sub {
  font-size: 1.2rem;
  color: rgba(255,255,255,0.9);
  max-width: 760px;
  margin: 0 auto 2.5rem;
  line-height: 1.8;
}

.btn-cta-inverted {
  display: inline-block;
  background-color: #FFFFFF;
  color: var(--color-ink);
  font-family: var(--font-body);
  font-weight: 900;
  font-size: 1.15rem;
  padding: 1.1rem 2.8rem;
  text-decoration: none;
  border: var(--border-width) solid var(--border-color);
  transition: background-color 0.15s ease, color 0.15s ease;
}

.btn-cta-inverted:hover {
  background-color: var(--color-ink);
  color: #FFFFFF;
}

/* 瑞士国际主义极简页脚 (严格保留4个链接，打开新窗口) */
.swiss-footer {
  padding: 4rem 0 3rem;
  background-color: var(--bg-paper);
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding-bottom: 2.5rem;
  border-bottom: var(--border-width) solid var(--border-color);
  margin-bottom: 2rem;
  flex-wrap: wrap;
  gap: 2rem;
}

.footer-brand h4 {
  font-size: 1.35rem;
  margin-bottom: 0.5rem;
}

.footer-brand p {
  font-size: 0.9rem;
  color: var(--color-ink-muted);
  max-width: 460px;
  line-height: 1.6;
}

.footer-nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
  flex-wrap: wrap;
}

.footer-nav-links a {
  text-decoration: none;
  color: var(--color-ink);
  font-weight: 700;
  font-size: 0.95rem;
  border-bottom: 1.5px solid transparent;
  padding-bottom: 2px;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.footer-nav-links a:hover {
  color: var(--color-blue);
  border-color: var(--color-blue);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--color-ink-muted);
  flex-wrap: wrap;
  gap: 1rem;
}

/* IntersectionObserver 轻微淡入 */
.fade-in-target {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.45s ease-out, transform 0.45s ease-out;
}

.fade-in-target.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* 响应式媒体查询适配手机单栏 */
@media (max-width: 992px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .stat-cell:nth-child(2) {
    border-right: none;
  }
  .stat-cell:nth-child(-n+2) {
    border-bottom: var(--border-width) solid var(--border-color);
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .media-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .pricing-card {
    border-right: none;
    border-bottom: var(--border-width) solid var(--border-color);
  }
  .pricing-card:last-child {
    border-bottom: none;
  }
  .reviews-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-inner {
    flex-wrap: wrap;
    height: auto;
    padding: 1rem 0;
    gap: 1rem;
  }
  .nav-links {
    gap: 1rem;
    flex-wrap: wrap;
  }
  .stats-grid {
    grid-template-columns: 1fr;
  }
  .stat-cell {
    border-right: none;
    border-bottom: var(--border-width) solid var(--border-color);
  }
  .stat-cell:last-child {
    border-bottom: none;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .media-grid {
    grid-template-columns: 1fr;
  }
  .hero-meta-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
  .footer-top {
    flex-direction: column;
  }
  .btn-swiss-primary, .btn-swiss-secondary {
    width: 100%;
  }
}