/* 飞书下载页风格（版式与配色参考 feishu.cn 下载站，独立样式避免与 eyy 冲突） */
:root {
  --fs-blue: #3370ff;
  --fs-blue-hover: #2860e0;
  --fs-blue-soft: #e8f0ff;
  --fs-blue-grad-end: #b4c8ff;
  --fs-text: #1f2329;
  --fs-text-2: #646a73;
  --fs-text-3: #8f959e;
  --fs-line: #e5e6eb;
  --fs-bg: #f5f6f7;
  --fs-white: #ffffff;
  --fs-radius: 12px;
  --fs-radius-lg: 20px;
  --fs-nav-h: 64px;
  --fs-max: 1200px;
  --fs-font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body.feishu-download {
  margin: 0;
  font-family: var(--fs-font);
  color: var(--fs-text);
  background: var(--fs-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* 顶栏导航 */
.fs-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--fs-nav-h);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--fs-line);
}

.fs-header-inner {
  max-width: var(--fs-max);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.fs-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--fs-text);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.02em;
}

.fs-brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 9px;
  background: linear-gradient(145deg, var(--fs-blue) 0%, #5c9dff 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 18px;
  font-weight: 800;
  box-shadow: 0 4px 14px rgba(51, 112, 255, 0.35);
}

.fs-nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  flex: 1;
  justify-content: center;
}

.fs-nav-links a {
  color: var(--fs-text);
  text-decoration: none;
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 15px;
  transition: background 0.15s, color 0.15s;
}

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

.fs-header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.fs-btn-text {
  background: none;
  border: none;
  color: var(--fs-text-2);
  font-size: 14px;
  cursor: pointer;
  padding: 8px 10px;
  font-family: inherit;
}

.fs-btn-text:hover {
  color: var(--fs-blue);
}

.fs-btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  background: var(--fs-blue);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  text-decoration: none;
  font-family: inherit;
  box-shadow: 0 2px 8px rgba(51, 112, 255, 0.35);
  transition: background 0.15s, transform 0.12s;
}

.fs-btn-primary:hover {
  background: var(--fs-blue-hover);
  transform: translateY(-1px);
}

.fs-btn-ghost {
  background: var(--fs-white);
  color: var(--fs-blue);
  border: 1px solid var(--fs-blue);
  box-shadow: none;
}

.fs-btn-ghost:hover {
  background: var(--fs-blue-soft);
}

.fs-nav-toggle {
  display: none;
  border: 1px solid var(--fs-line);
  background: var(--fs-white);
  border-radius: 8px;
  padding: 8px 12px;
  cursor: pointer;
  font-size: 18px;
}

@media (max-width: 960px) {
  .fs-nav-toggle {
    display: block;
  }

  .fs-nav-links {
    display: none;
    position: absolute;
    top: var(--fs-nav-h);
    left: 0;
    right: 0;
    background: var(--fs-white);
    flex-direction: column;
    padding: 12px 20px 20px;
    border-bottom: 1px solid var(--fs-line);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.06);
  }

  .fs-nav-links.is-open {
    display: flex;
  }

  .fs-header-actions .fs-btn-text {
    display: none;
  }
}

/* 首屏 */
.fs-hero {
  background: linear-gradient(180deg, #eef3ff 0%, var(--fs-bg) 55%, var(--fs-bg) 100%);
  padding: 48px 24px 64px;
  overflow: hidden;
}

.fs-hero-grid {
  max-width: var(--fs-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

@media (max-width: 900px) {
  .fs-hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .fs-hero-cta {
    justify-content: center;
  }

  .fs-hero-badges {
    justify-content: center;
  }
}

.fs-hero-kicker {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--fs-blue);
  background: var(--fs-blue-soft);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 16px;
}

.fs-hero h1 {
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.25;
  margin: 0 0 16px;
  letter-spacing: -0.03em;
}

.fs-hero-lead {
  font-size: 17px;
  color: var(--fs-text-2);
  margin: 0 0 28px;
  max-width: 520px;
}

.fs-hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
}

.fs-hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  font-size: 13px;
  color: var(--fs-text-3);
}

.fs-hero-badges span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.fs-hero-visual {
  position: relative;
  min-height: 320px;
}

.fs-mock-dock {
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, var(--fs-white) 0%, #f0f4ff 100%);
  border-radius: var(--fs-radius-lg);
  border: 1px solid var(--fs-line);
  box-shadow: 0 24px 64px rgba(31, 35, 41, 0.12);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.fs-mock-bar {
  height: 12px;
  display: flex;
  gap: 6px;
  align-items: center;
}

.fs-mock-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #ddd;
}

.fs-mock-dot:nth-child(1) {
  background: #ff5f57;
}

.fs-mock-dot:nth-child(2) {
  background: #febc2e;
}

.fs-mock-dot:nth-child(3) {
  background: #28c840;
}

.fs-mock-body {
  flex: 1;
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 12px;
}

.fs-mock-side {
  background: var(--fs-bg);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 10px;
}

.fs-mock-pill {
  height: 8px;
  background: #e0e3e9;
  border-radius: 4px;
  width: 80%;
}

.fs-mock-main {
  background: var(--fs-white);
  border-radius: 10px;
  border: 1px solid var(--fs-line);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.fs-mock-line {
  height: 10px;
  background: linear-gradient(90deg, var(--fs-blue-soft), transparent);
  border-radius: 4px;
  max-width: 100%;
}

.fs-mock-line.short {
  max-width: 55%;
}

.fs-float-card {
  position: absolute;
  right: -8px;
  bottom: 24px;
  background: var(--fs-white);
  padding: 14px 18px;
  border-radius: 14px;
  box-shadow: 0 12px 40px rgba(51, 112, 255, 0.2);
  border: 1px solid var(--fs-line);
  font-size: 13px;
  font-weight: 600;
  color: var(--fs-blue);
  animation: fs-float 4s ease-in-out infinite;
}

@keyframes fs-float {
  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-8px);
  }
}

/* 区块标题 */
.fs-section {
  padding: 56px 24px;
}

.fs-section--white {
  background: var(--fs-white);
}

.fs-section-head {
  max-width: var(--fs-max);
  margin: 0 auto 40px;
  text-align: center;
}

.fs-section-head h2 {
  font-size: clamp(24px, 3vw, 32px);
  margin: 0 0 12px;
  letter-spacing: -0.02em;
}

.fs-section-head p {
  margin: 0;
  color: var(--fs-text-2);
  font-size: 16px;
}

/* 下载卡片网格 */
.fs-download-grid {
  max-width: var(--fs-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

@media (max-width: 960px) {
  .fs-download-grid {
    grid-template-columns: 1fr;
  }
}

.fs-dl-card {
  background: var(--fs-white);
  border: 1px solid var(--fs-line);
  border-radius: var(--fs-radius-lg);
  padding: 28px 24px;
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}

.fs-dl-card:hover {
  border-color: rgba(51, 112, 255, 0.35);
  box-shadow: 0 12px 40px rgba(51, 112, 255, 0.1);
  transform: translateY(-2px);
}

.fs-dl-card.is-active {
  border-color: var(--fs-blue);
  box-shadow: 0 12px 40px rgba(51, 112, 255, 0.15);
}

.fs-dl-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--fs-blue-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  color: var(--fs-blue);
}

.fs-dl-card h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.fs-dl-card > p {
  margin: 0 0 16px;
  font-size: 14px;
  color: var(--fs-text-2);
  min-height: 44px;
}

.fs-dl-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.fs-btn-dl {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 11px 16px;
  font-size: 14px;
  font-weight: 600;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  font-family: inherit;
  text-decoration: none;
  background: var(--fs-blue);
  color: #fff;
  transition: background 0.15s;
}

.fs-btn-dl:hover {
  background: var(--fs-blue-hover);
}

.fs-btn-dl--secondary {
  background: var(--fs-white);
  color: var(--fs-blue);
  border: 1px solid var(--fs-line);
}

.fs-btn-dl--secondary:hover {
  background: var(--fs-blue-soft);
  border-color: var(--fs-blue);
}

.fs-dl-meta {
  font-size: 12px;
  color: var(--fs-text-3);
  margin-top: 12px;
}

/* 能力矩阵 */
.fs-features {
  max-width: var(--fs-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

@media (max-width: 1000px) {
  .fs-features {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 560px) {
  .fs-features {
    grid-template-columns: 1fr;
  }
}

.fs-feature {
  background: var(--fs-white);
  border-radius: var(--fs-radius);
  padding: 24px 20px;
  border: 1px solid var(--fs-line);
  transition: transform 0.2s, box-shadow 0.2s;
}

.fs-feature:hover {
  transform: translateY(-3px);
  box-shadow: var(--fs-shadow, 0 8px 28px rgba(0, 0, 0, 0.06));
}

.fs-feature-icon {
  font-size: 26px;
  margin-bottom: 12px;
}

.fs-feature h3 {
  margin: 0 0 8px;
  font-size: 16px;
}

.fs-feature p {
  margin: 0;
  font-size: 14px;
  color: var(--fs-text-2);
  line-height: 1.55;
}

/* 大横幅 CTA */
.fs-cta-banner {
  max-width: var(--fs-max);
  margin: 0 auto;
  background: linear-gradient(135deg, #3370ff 0%, #6b9cff 50%, #8eb4ff 100%);
  border-radius: var(--fs-radius-lg);
  padding: 48px 40px;
  text-align: center;
  color: #fff;
}

.fs-cta-banner h2 {
  margin: 0 0 12px;
  font-size: 26px;
}

.fs-cta-banner p {
  margin: 0 0 24px;
  opacity: 0.92;
  font-size: 16px;
}

.fs-cta-banner .fs-btn-primary {
  background: #fff;
  color: var(--fs-blue);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.fs-cta-banner .fs-btn-primary:hover {
  background: #f3f6ff;
}

/* 步骤 */
.fs-steps {
  max-width: 900px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

@media (max-width: 720px) {
  .fs-steps {
    grid-template-columns: 1fr;
  }
}

.fs-step {
  text-align: center;
  padding: 20px;
}

.fs-step-num {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--fs-blue);
  color: #fff;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 14px;
}

.fs-step h3 {
  margin: 0 0 8px;
  font-size: 16px;
}

.fs-step p {
  margin: 0;
  font-size: 14px;
  color: var(--fs-text-2);
}

/* FAQ */
.fs-faq {
  max-width: 720px;
  margin: 0 auto;
}

.fs-faq-item {
  border-bottom: 1px solid var(--fs-line);
}

.fs-faq-q {
  width: 100%;
  text-align: left;
  padding: 18px 8px;
  font-size: 15px;
  font-weight: 600;
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  font-family: inherit;
  color: var(--fs-text);
}

.fs-faq-q:hover {
  color: var(--fs-blue);
}

.fs-faq-icon {
  transition: transform 0.2s;
  color: var(--fs-text-3);
  flex-shrink: 0;
}

.fs-faq-item.is-open .fs-faq-icon {
  transform: rotate(180deg);
}

.fs-faq-a {
  display: none;
  padding: 0 8px 18px;
  font-size: 14px;
  color: var(--fs-text-2);
  line-height: 1.65;
}

.fs-faq-item.is-open .fs-faq-a {
  display: block;
}

/* 页脚 */
.fs-footer {
  background: #1f2329;
  color: #8f959e;
  padding: 48px 24px 24px;
  font-size: 13px;
}

.fs-footer-inner {
  max-width: var(--fs-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 32px;
}

@media (max-width: 800px) {
  .fs-footer-inner {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 520px) {
  .fs-footer-inner {
    grid-template-columns: 1fr;
  }
}

.fs-footer-brand {
  color: #fff;
  font-weight: 700;
  font-size: 16px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.fs-footer-col h4 {
  color: #fff;
  font-size: 14px;
  margin: 0 0 14px;
  font-weight: 600;
}

.fs-footer-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.fs-footer-col li {
  margin-bottom: 8px;
}

.fs-footer-col a {
  color: #8f959e;
  text-decoration: none;
}

.fs-footer-col a:hover {
  color: #fff;
}

.fs-footer-bottom {
  max-width: var(--fs-max);
  margin: 32px auto 0;
  padding-top: 24px;
  border-top: 1px solid #2f3339;
  text-align: center;
  font-size: 12px;
  line-height: 1.7;
}

.fs-footer-bottom a {
  color: #b4c8ff;
}

/* 内联 secondary 链接条 */
.fs-subnav {
  max-width: var(--fs-max);
  margin: 0 auto 8px;
  padding: 0 24px;
  font-size: 13px;
  color: var(--fs-text-3);
}

.fs-subnav a {
  color: var(--fs-blue);
  text-decoration: none;
}

.fs-subnav a:hover {
  text-decoration: underline;
}