/* ===== YATONE Website — Global Styles ===== */
/* 承压通（成都）信息技术有限公司 */

:root {
  --color-primary: #1B3A5C;
  --color-primary-dark: #0D2137;
  --color-primary-light: #2A5580;
  --color-accent: #C41230;
  --color-accent-hover: #A00E28;
  --color-bg: #F8F8F5;
  --color-bg-dark: #E8E6DE;
  --color-white: #FFFFFF;
  --color-text: #2C2C2A;
  --color-text-light: #5F5E5A;
  --color-text-muted: #888780;
  --color-border: #D3D1C7;
  --color-success: #1D9E75;
  --font-sans: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Consolas", "Monaco", monospace;
  --max-width: 1200px;
  --nav-height: 64px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--color-primary-light);
}

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

/* ===== Navigation ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--color-primary-dark);
  z-index: 1000;
  display: flex;
  align-items: center;
  border-bottom: 2px solid var(--color-accent);
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-logo img {
  height: 36px;
  width: auto;
}

.nav-logo-text {
  color: var(--color-white);
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 1px;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 4px;
}

.nav-links a {
  color: rgba(255,255,255,0.85);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 400;
  transition: background 0.2s, color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  background: rgba(255,255,255,0.1);
  color: var(--color-white);
}

.nav-cta {
  background: var(--color-accent) !important;
  color: var(--color-white) !important;
  font-weight: 500 !important;
}

.nav-cta:hover {
  background: var(--color-accent-hover) !important;
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-white);
  border-radius: 1px;
  transition: transform 0.3s;
}

/* ===== Hero Section ===== */
.hero {
  margin-top: var(--nav-height);
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 60%, var(--color-primary-light) 100%);
  color: var(--color-white);
  padding: 80px 24px;
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: '';
  position: absolute;
  right: -80px;
  bottom: -40px;
  width: 400px;
  height: 400px;
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 50%;
}

.hero::before {
  content: '';
  position: absolute;
  right: 60px;
  top: -60px;
  width: 200px;
  height: 200px;
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: 50%;
}

.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero-tag {
  display: inline-block;
  background: var(--color-accent);
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 1px;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: 40px;
  font-weight: 500;
  line-height: 1.3;
  margin-bottom: 20px;
  max-width: 640px;
}

.hero p {
  font-size: 17px;
  color: rgba(255,255,255,0.75);
  line-height: 1.7;
  max-width: 560px;
  margin-bottom: 36px;
}

.hero-btns {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: none;
  transition: all 0.2s;
  font-family: var(--font-sans);
  text-decoration: none;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-white);
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  color: var(--color-white);
}

.btn-outline {
  background: transparent;
  color: var(--color-white);
  border: 1px solid rgba(255,255,255,0.3);
}

.btn-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.5);
  color: var(--color-white);
}

.btn-dark {
  background: var(--color-primary);
  color: var(--color-white);
}

.btn-dark:hover {
  background: var(--color-primary-light);
  color: var(--color-white);
}

/* ===== Sections ===== */
.section {
  padding: 80px 24px;
}

.section-dark {
  background: var(--color-primary-dark);
  color: var(--color-white);
}

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

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 12px;
}

.section-title {
  font-size: 30px;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 16px;
}

.section-dark .section-title {
  color: var(--color-white);
}

.section-subtitle {
  font-size: 16px;
  color: var(--color-text-light);
  max-width: 600px;
  line-height: 1.7;
}

.section-dark .section-subtitle {
  color: rgba(255,255,255,0.7);
}

/* ===== Stats / Numbers Row ===== */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid rgba(255,255,255,0.1);
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.stat-item {
  text-align: center;
  padding: 32px 16px;
  border-right: 1px solid rgba(255,255,255,0.1);
}

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

.stat-number {
  font-size: 36px;
  font-weight: 500;
  color: var(--color-white);
  line-height: 1.2;
}

.stat-label {
  font-size: 13px;
  color: rgba(255,255,255,0.6);
  margin-top: 8px;
}

/* ===== Feature Cards ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.feature-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 36px 28px;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
  border-color: var(--color-primary-light);
  box-shadow: 0 2px 20px rgba(0,0,0,0.06);
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: var(--color-primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-icon svg {
  width: 24px;
  height: 24px;
  stroke: var(--color-white);
}

.feature-card h3 {
  font-size: 17px;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ===== Pain Point Cards ===== */
.pain-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 48px;
}

.pain-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px;
  border-left: 4px solid var(--color-accent);
}

.pain-card h3 {
  font-size: 17px;
  font-weight: 500;
  margin-bottom: 10px;
  color: var(--color-primary);
}

.pain-card p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ===== Solution Cards ===== */
.solution-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.solution-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  text-align: left;
}

.solution-card h3 {
  font-size: 19px;
  font-weight: 500;
  margin-bottom: 12px;
  color: var(--color-primary);
}

.solution-card p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 20px;
}

.solution-card .card-link {
  font-weight: 500;
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* ===== Case Cards ===== */
.case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.case-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.3s;
}

.case-card:hover {
  border-color: var(--color-primary-light);
}

.case-card-body {
  padding: 24px;
}

.case-card-tag {
  font-size: 12px;
  font-weight: 500;
  color: var(--color-primary);
  background: rgba(27,58,92,0.08);
  padding: 3px 10px;
  border-radius: 20px;
  display: inline-block;
  margin-bottom: 12px;
}

.case-card h3 {
  font-size: 17px;
  font-weight: 500;
  margin-bottom: 8px;
}

.case-card p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ===== CTA Banner ===== */
.cta-banner {
  background: var(--color-accent);
  text-align: center;
  padding: 60px 24px;
}

.cta-banner h2 {
  font-size: 28px;
  font-weight: 500;
  color: var(--color-white);
  margin-bottom: 12px;
}

.cta-banner p {
  color: rgba(255,255,255,0.85);
  font-size: 15px;
  margin-bottom: 28px;
}

/* ===== Page Hero (inner pages) ===== */
.page-hero {
  margin-top: var(--nav-height);
  background: var(--color-primary);
  color: var(--color-white);
  padding: 60px 24px;
  text-align: center;
}

.page-hero h1 {
  font-size: 34px;
  font-weight: 500;
  margin-bottom: 12px;
}

.page-hero p {
  font-size: 16px;
  color: rgba(255,255,255,0.7);
  max-width: 560px;
  margin: 0 auto;
}

/* ===== Knowledge ===== */
.knowledge-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 48px;
}

.knowledge-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  gap: 20px;
  transition: border-color 0.3s;
}

.knowledge-card:hover {
  border-color: var(--color-primary-light);
}

.knowledge-card-icon {
  width: 44px;
  height: 44px;
  background: var(--color-primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.knowledge-card-icon svg {
  width: 20px;
  height: 20px;
  stroke: var(--color-white);
}

.knowledge-card h3 {
  font-size: 16px;
  font-weight: 500;
  margin-bottom: 6px;
}

.knowledge-card p {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ===== About Section ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  margin-top: 48px;
}

.about-info h3 {
  font-size: 20px;
  font-weight: 500;
  margin-bottom: 16px;
  color: var(--color-primary);
}

.about-info p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 24px;
}

.contact-list {
  list-style: none;
}

.contact-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 14px;
  color: var(--color-text-light);
}

.contact-list li:last-child {
  border-bottom: none;
}

.contact-list .label {
  font-weight: 500;
  color: var(--color-text);
  min-width: 60px;
  flex-shrink: 0;
}

/* ===== Footer ===== */
.footer {
  background: var(--color-primary-dark);
  color: rgba(255,255,255,0.6);
  padding: 48px 24px 32px;
  font-size: 13px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}

.footer-brand h3 {
  color: var(--color-white);
  font-size: 18px;
  font-weight: 500;
  margin-bottom: 12px;
}

.footer-brand p {
  line-height: 1.7;
}

.footer-col h4 {
  color: var(--color-white);
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 16px;
}

.footer-col ul {
  list-style: none;
}

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

.footer-col a {
  color: rgba(255,255,255,0.6);
  font-size: 13px;
}

.footer-col a:hover {
  color: var(--color-white);
}

.footer-bottom {
  max-width: var(--max-width);
  margin: 32px auto 0;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.1);
  text-align: center;
  font-size: 12px;
  color: rgba(255,255,255,0.4);
}

/* ===== Video Showcase ===== */
.video-showcase {
  padding: 80px 24px;
  background: var(--color-primary-dark);
  color: var(--color-white);
}

.video-showcase-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
}

.video-showcase .section-label {
  color: rgba(255,255,255,0.6);
}

.video-showcase .section-title {
  color: var(--color-white);
}

.video-showcase .section-subtitle {
  color: rgba(255,255,255,0.7);
  margin: 0 auto 48px;
}

.video-cover {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  box-shadow: 0 8px 40px rgba(0,0,0,0.3);
  transition: transform 0.3s, box-shadow 0.3s;
}

.video-cover:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 50px rgba(0,0,0,0.4);
}

.video-cover-bg {
  width: 100%;
  aspect-ratio: 16/9;
  background: linear-gradient(135deg, #0D2137 0%, #1B3A5C 50%, #2A5580 100%);
  position: relative;
}

.video-cover-mockup {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
}

.video-cover-mockup-bar {
  height: 36px;
  background: rgba(0,0,0,0.3);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 8px;
  flex-shrink: 0;
}

.video-cover-mockup-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  opacity: 0.7;
}

.video-cover-mockup-content {
  flex: 1;
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 1px;
  background: rgba(255,255,255,0.06);
}

.video-cover-mockup-sidebar {
  background: rgba(0,0,0,0.25);
  padding: 16px;
}

.video-cover-mockup-sidebar-item {
  height: 12px;
  background: rgba(255,255,255,0.12);
  border-radius: 2px;
  margin-bottom: 10px;
}

.video-cover-mockup-main {
  background: rgba(255,255,255,0.03);
  padding: 20px;
}

.video-cover-mockup-card {
  background: rgba(255,255,255,0.06);
  border-radius: 4px;
  height: 56px;
  margin-bottom: 12px;
}

.video-cover-mockup-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 12px;
}

.video-cover-mockup-stat {
  background: rgba(255,255,255,0.05);
  border-radius: 4px;
  height: 48px;
}

.video-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 72px;
  height: 72px;
  background: rgba(196,18,48,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s;
  z-index: 2;
  border: none;
  cursor: pointer;
}

.video-cover:hover .video-play-btn {
  background: var(--color-accent);
  transform: translate(-50%, -50%) scale(1.1);
  box-shadow: 0 0 40px rgba(196,18,48,0.6);
}

.video-play-btn svg {
  width: 28px;
  height: 28px;
  fill: var(--color-white);
  margin-left: 4px;
}

.video-cover-label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 20px 28px;
  background: linear-gradient(transparent, rgba(0,0,0,0.6));
  text-align: left;
  z-index: 2;
}

.video-cover-label h3 {
  color: var(--color-white);
  font-size: 18px;
  font-weight: 500;
  margin-bottom: 4px;
}

.video-cover-label p {
  color: rgba(255,255,255,0.6);
  font-size: 13px;
}

/* Video Modal */
.video-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.88);
  z-index: 9999;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.video-modal.open {
  display: flex;
}

.video-modal-inner {
  position: relative;
  width: 100%;
  max-width: 900px;
}

.video-modal-close {
  position: absolute;
  top: -44px;
  right: 0;
  background: none;
  border: none;
  color: rgba(255,255,255,0.7);
  font-size: 32px;
  cursor: pointer;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.2s;
  line-height: 1;
}

.video-modal-close:hover {
  color: var(--color-white);
}

.video-modal-body {
  width: 100%;
  aspect-ratio: 16/9;
  background: #000;
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.video-modal-body video {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.video-modal-body iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.video-modal-placeholder {
  text-align: center;
  color: rgba(255,255,255,0.5);
  padding: 40px;
}

.video-modal-placeholder svg {
  width: 64px;
  height: 64px;
  margin-bottom: 16px;
  opacity: 0.3;
}

.video-modal-placeholder p {
  font-size: 16px;
  margin-bottom: 8px;
}

.video-modal-placeholder span {
  font-size: 13px;
  color: rgba(255,255,255,0.3);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .features-grid,
  .solution-grid,
  .case-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .stats-row {
    grid-template-columns: repeat(2, 1fr);
  }
  .stat-item:nth-child(2) {
    border-right: none;
  }
  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .nav-toggle {
    display: flex;
  }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-primary-dark);
    padding: 16px;
    gap: 2px;
  }
  .nav-links.open a {
    display: block;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
  }
  .hero h1 {
    font-size: 28px;
  }
  .hero p {
    font-size: 15px;
  }
  .section-title {
    font-size: 24px;
  }
  .features-grid,
  .solution-grid,
  .case-grid,
  .pain-grid,
  .knowledge-grid,
  .about-grid {
    grid-template-columns: 1fr;
  }
  .stats-row {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .hero-btns {
    flex-direction: column;
  }
  .video-cover-mockup-content {
    grid-template-columns: 120px 1fr;
  }
  .video-cover-mockup-sidebar {
    padding: 10px;
  }
  .video-cover-mockup-main {
    padding: 12px;
  }
  .video-play-btn {
    width: 56px;
    height: 56px;
  }
  .video-play-btn svg {
    width: 22px;
    height: 22px;
  }
  .video-cover-label h3 {
    font-size: 15px;
  }
  .video-cover-label p {
    font-size: 12px;
  }
}