/* ==========================================================================
   FeituCloud (飞兔云) — Japanese-Editorial Cloud Infrastructure Design System
   Colors:
     Primary Aqua Teal : #0FA3B1
     Deep Ink          : #0B2E33
     Warm Paper        : #FBFAF6
     Soft Mist         : #DCE8E6
     CTA Hover Amber   : #FFB238
   ========================================================================== */

:root {
  --color-teal: #0FA3B1;
  --color-ink: #0B2E33;
  --color-ink-muted: #3A5A5F;
  --color-paper: #FBFAF6;
  --color-mist: #DCE8E6;
  --color-mist-light: #F1F6F5;
  --color-amber: #FFB238;
  --font-latin: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-cn: 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-stack: var(--font-latin), var(--font-cn);
  --radius-btn: 2px;
  --shadow-subtle: 0 2px 4px rgba(11, 46, 51, 0.06);
  --max-width: 1180px;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-stack);
  background-color: var(--color-paper);
  color: var(--color-ink);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

.num,
.metric-val,
.price-num,
td {
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

/* Container & Editorial Grid */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
}

.hairline {
  border: 0;
  border-top: 1px solid var(--color-mist);
  margin: 0;
}

/* Gentle Fade-Up Animation on Scroll */
.fade-up {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.65s cubic-bezier(0.22, 1, 0.36, 1), transform 0.65s cubic-bezier(0.22, 1, 0.36, 1);
}

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

@media (prefers-reduced-motion: reduce) {
  .fade-up {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-paper);
  border-bottom: 1px solid var(--color-mist);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  gap: 24px;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: 0.02em;
  color: var(--color-ink);
}

.brand-logo img,
.brand-logo svg {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.brand-sub {
  font-weight: 300;
  font-size: 0.82rem;
  color: var(--color-ink-muted);
  letter-spacing: 0.08em;
  margin-left: 4px;
  padding-left: 8px;
  border-left: 1px solid var(--color-mist);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  position: relative;
  font-size: 0.92rem;
  font-weight: 400;
  color: var(--color-ink);
  padding: 6px 0;
  letter-spacing: 0.02em;
}

/* Underline slide-in on nav links */
.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1.5px;
  background-color: var(--color-teal);
  transform: scaleX(0);
  transform-origin: right center;
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
  transform-origin: left center;
}

.nav-link-highlight {
  color: var(--color-teal);
  font-weight: 600;
}

/* Buttons: 2px-radius solid fills, amber #FFB238 for CTA hover only */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  font-size: 0.94rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  border-radius: var(--radius-btn);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  text-align: center;
  line-height: 1.3;
}

.btn-primary {
  background-color: var(--color-teal);
  color: var(--color-paper);
  border-color: var(--color-teal);
  box-shadow: var(--shadow-subtle);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background-color: var(--color-amber);
  border-color: var(--color-amber);
  color: var(--color-ink);
}

.btn-ink {
  background-color: var(--color-ink);
  color: var(--color-paper);
  border-color: var(--color-ink);
  box-shadow: var(--shadow-subtle);
}

.btn-ink:hover,
.btn-ink:focus-visible {
  background-color: var(--color-amber);
  border-color: var(--color-amber);
  color: var(--color-ink);
}

.btn-outline {
  background-color: var(--color-mist-light);
  color: var(--color-ink);
  border-color: var(--color-ink);
}

.btn-outline:hover,
.btn-outline:focus-visible {
  background-color: var(--color-amber);
  border-color: var(--color-amber);
  color: var(--color-ink);
}

.btn-sm {
  padding: 9px 18px;
  font-size: 0.86rem;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
  padding: 88px 0 76px;
  border-bottom: 1px solid var(--color-mist);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.35fr 0.65fr;
  gap: 56px;
  align-items: start;
}

.editorial-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-teal);
  margin-bottom: 20px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--color-mist);
}

.hero-title {
  font-size: 3.1rem;
  font-weight: 300;
  line-height: 1.22;
  color: var(--color-ink);
  letter-spacing: -0.015em;
  margin-bottom: 20px;
}

.hero-title strong {
  font-weight: 700;
  color: var(--color-ink);
}

.hero-title .accent-word {
  font-weight: 700;
  color: var(--color-teal);
}

.hero-subtitle {
  font-size: 1.24rem;
  font-weight: 400;
  color: var(--color-ink);
  line-height: 1.55;
  margin-bottom: 18px;
}

.hero-intro {
  font-size: 0.98rem;
  color: var(--color-ink-muted);
  max-width: 640px;
  margin-bottom: 36px;
  line-height: 1.85;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
}

/* Right telemetry panel in Hero */
.hero-telemetry {
  background-color: var(--color-mist-light);
  border: 1px solid var(--color-mist);
  border-radius: var(--radius-btn);
  padding: 28px;
  box-shadow: var(--shadow-subtle);
}

.telemetry-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 14px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--color-mist);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  background-color: var(--color-teal);
  border-radius: 50%;
  margin-right: 6px;
}

.telemetry-list {
  list-style: none;
  display: grid;
  gap: 16px;
}

.telemetry-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-mist);
}

.telemetry-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.telemetry-label {
  font-size: 0.86rem;
  color: var(--color-ink-muted);
}

.telemetry-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-ink);
  font-variant-numeric: tabular-nums;
}

.telemetry-value span {
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--color-teal);
  margin-left: 4px;
}

/* ==========================================================================
   Section Scaffolding
   ========================================================================== */
.section {
  padding: 84px 0;
  border-bottom: 1px solid var(--color-mist);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 32px;
  margin-bottom: 48px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-mist);
}

.section-index {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--color-teal);
  text-transform: uppercase;
  margin-bottom: 8px;
  display: block;
}

.section-title {
  font-size: 2rem;
  font-weight: 300;
  color: var(--color-ink);
  line-height: 1.3;
}

.section-title strong {
  font-weight: 700;
}

.section-desc {
  max-width: 460px;
  font-size: 0.94rem;
  color: var(--color-ink-muted);
  line-height: 1.75;
}

/* ==========================================================================
   Core Advantages (3 Cards)
   ========================================================================== */
.cards-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.editorial-card {
  background-color: var(--color-paper);
  border: 1px solid var(--color-mist);
  border-radius: var(--radius-btn);
  padding: 28px;
  box-shadow: var(--shadow-subtle);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.card-visual {
  border: 1px solid var(--color-mist);
  margin-bottom: 22px;
  background-color: var(--color-paper);
}

.card-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-teal);
  margin-bottom: 10px;
  text-transform: uppercase;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 12px;
  line-height: 1.4;
}

.card-text {
  font-size: 0.92rem;
  color: var(--color-ink-muted);
  line-height: 1.75;
}

/* ==========================================================================
   Streaming & AI Support Cards (2 Large Visual Cards)
   ========================================================================== */
.cards-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.media-card {
  background-color: var(--color-mist-light);
  border: 1px solid var(--color-mist);
  border-radius: var(--radius-btn);
  padding: 32px;
  box-shadow: var(--shadow-subtle);
}

.media-card-img {
  border: 1px solid var(--color-mist);
  margin-bottom: 24px;
  background-color: var(--color-paper);
}

.badge-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
  list-style: none;
}

.badge-item {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 11px;
  background-color: var(--color-paper);
  border: 1px solid var(--color-mist);
  border-radius: var(--radius-btn);
  color: var(--color-ink);
}

/* ==========================================================================
   Pricing Comparison Table & Tier Highlights
   ========================================================================== */
.pricing-table-wrap {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--color-mist);
  border-radius: var(--radius-btn);
  box-shadow: var(--shadow-subtle);
  background-color: var(--color-paper);
}

.pricing-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 720px;
}

.pricing-table th,
.pricing-table td {
  padding: 20px 22px;
  border-bottom: 1px solid var(--color-mist);
  border-right: 1px solid var(--color-mist);
  font-size: 0.94rem;
}

.pricing-table th:last-child,
.pricing-table td:last-child {
  border-right: none;
}

.pricing-table thead th {
  background-color: var(--color-ink);
  color: var(--color-paper);
  font-weight: 600;
  letter-spacing: 0.04em;
  font-size: 0.86rem;
  text-transform: uppercase;
}

.pricing-table tbody tr:hover {
  background-color: var(--color-mist-light);
}

.pricing-table tbody tr.featured-row {
  background-color: var(--color-mist-light);
}

.tier-name {
  font-weight: 700;
  color: var(--color-ink);
  display: block;
  font-size: 1.02rem;
}

.tier-badge {
  display: inline-block;
  margin-top: 4px;
  padding: 2px 7px;
  font-size: 0.72rem;
  font-weight: 700;
  background-color: var(--color-teal);
  color: var(--color-paper);
  border-radius: var(--radius-btn);
}

.price-strong {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-teal);
}

.pricing-note {
  margin-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.86rem;
  color: var(--color-ink-muted);
}

/* ==========================================================================
   User Reviews (Testimonials)
   ========================================================================== */
.review-card {
  background-color: var(--color-paper);
  border: 1px solid var(--color-mist);
  border-radius: var(--radius-btn);
  padding: 28px;
  box-shadow: var(--shadow-subtle);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-rating {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-teal);
  letter-spacing: 0.08em;
  margin-bottom: 14px;
}

.review-quote {
  font-size: 0.94rem;
  color: var(--color-ink);
  line-height: 1.8;
  margin-bottom: 20px;
}

.review-author {
  padding-top: 14px;
  border-top: 1px solid var(--color-mist);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.84rem;
}

.author-name {
  font-weight: 700;
  color: var(--color-ink);
}

.author-role {
  color: var(--color-ink-muted);
}

/* ==========================================================================
   FAQ Section
   ========================================================================== */
.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.faq-item {
  border: 1px solid var(--color-mist);
  border-radius: var(--radius-btn);
  padding: 24px 28px;
  background-color: var(--color-paper);
  box-shadow: var(--shadow-subtle);
}

.faq-question {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 10px;
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.faq-q-mark {
  color: var(--color-teal);
  font-family: var(--font-latin);
  font-weight: 700;
}

.faq-answer {
  font-size: 0.92rem;
  color: var(--color-ink-muted);
  line-height: 1.78;
}

/* ==========================================================================
   Bottom CTA Banner
   ========================================================================== */
.cta-banner {
  background-color: var(--color-ink);
  color: var(--color-paper);
  padding: 64px 0;
  border-bottom: 1px solid var(--color-mist);
}

.cta-banner-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 32px;
  flex-wrap: wrap;
}

.cta-banner-title {
  font-size: 1.85rem;
  font-weight: 300;
  color: var(--color-paper);
  margin-bottom: 8px;
}

.cta-banner-title strong {
  font-weight: 700;
  color: var(--color-teal);
}

.cta-banner-desc {
  color: var(--color-mist);
  font-size: 0.95rem;
}

/* ==========================================================================
   Site Footer (Strictly 4 Titles Opening in New Pages)
   ========================================================================== */
.site-footer {
  background-color: var(--color-paper);
  padding: 44px 0;
}

.footer-only-links {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 48px;
  flex-wrap: wrap;
}

.footer-title-link {
  font-size: 0.96rem;
  font-weight: 600;
  color: var(--color-ink);
  letter-spacing: 0.05em;
  padding: 6px 0;
  position: relative;
}

.footer-title-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1.5px;
  background-color: var(--color-teal);
  transform: scaleX(0);
  transform-origin: right center;
  transition: transform 0.3s ease;
}

.footer-title-link:hover::after {
  transform: scaleX(1);
  transform-origin: left center;
}

/* ==========================================================================
   Subpages & Editorial Articles Layout (推荐资讯 & Footer Pages)
   ========================================================================== */
.page-hero {
  padding: 64px 0 48px;
  border-bottom: 1px solid var(--color-mist);
  background-color: var(--color-mist-light);
}

.article-toc {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 32px;
}

.toc-card {
  background-color: var(--color-paper);
  border: 1px solid var(--color-mist);
  padding: 18px 22px;
  border-radius: var(--radius-btn);
  box-shadow: var(--shadow-subtle);
  transition: border-color 0.2s ease;
}

.toc-card:hover {
  border-color: var(--color-teal);
}

.toc-num {
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--color-teal);
  letter-spacing: 0.1em;
  display: block;
  margin-bottom: 4px;
}

.toc-title {
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--color-ink);
}

.article-stream {
  padding: 56px 0;
  display: grid;
  gap: 48px;
}

.seo-article {
  background-color: var(--color-paper);
  border: 1px solid var(--color-mist);
  border-radius: var(--radius-btn);
  padding: 40px;
  box-shadow: var(--shadow-subtle);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.8rem;
  color: var(--color-ink-muted);
  padding-bottom: 16px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--color-mist);
}

.article-category {
  color: var(--color-teal);
  font-weight: 700;
  letter-spacing: 0.08em;
}

.seo-article h2 {
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 18px;
  line-height: 1.38;
}

.seo-article h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-ink);
  margin: 24px 0 10px;
}

.seo-article p {
  font-size: 0.96rem;
  color: var(--color-ink);
  margin-bottom: 16px;
  line-height: 1.85;
}

.seo-article ul {
  margin: 0 0 18px 20px;
  color: var(--color-ink-muted);
}

.seo-article li {
  margin-bottom: 8px;
  font-size: 0.94rem;
}

.seo-article a.editorial-link {
  color: var(--color-teal);
  font-weight: 700;
  border-bottom: 1px solid var(--color-teal);
  padding-bottom: 1px;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.seo-article a.editorial-link:hover {
  color: var(--color-ink);
  background-color: var(--color-amber);
  border-color: var(--color-ink);
}

/* ==========================================================================
   Responsive Design (@media) — Mobile Single-Column & Finger-Friendly CTA
   ========================================================================== */
@media (max-width: 960px) {
  .hero-grid,
  .cards-grid-3,
  .cards-grid-2,
  .faq-grid,
  .article-toc {
    grid-template-columns: 1fr;
  }

  .section-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .hero-title {
    font-size: 2.35rem;
  }
}

@media (max-width: 680px) {
  .container {
    padding: 0 20px;
  }

  .header-inner {
    flex-direction: column;
    align-items: stretch;
    padding: 16px 0;
    gap: 14px;
  }

  .site-nav {
    flex-wrap: wrap;
    gap: 14px 20px;
    justify-content: flex-start;
    border-top: 1px solid var(--color-mist);
    padding-top: 12px;
  }

  .hero-section {
    padding: 48px 0 44px;
  }

  .hero-title {
    font-size: 1.95rem;
  }

  .hero-subtitle {
    font-size: 1.08rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    width: 100%;
    min-height: 48px;
    padding: 14px 20px;
    font-size: 1rem;
  }

  .section {
    padding: 56px 0;
  }

  .section-title {
    font-size: 1.6rem;
  }

  .seo-article {
    padding: 24px 20px;
  }

  .footer-only-links {
    flex-direction: column;
    gap: 20px;
  }
}