@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700;900&family=ZCOOL+XiaoWei&display=swap');

:root {
  --primary: #1565c0;
  --primary-dark: #0d47a1;
  --accent: #00acc1;
  --bg-light: #e3f2fd;
  --bg-white: #ffffff;
  --text-dark: #0d47a1;
  --text-gray: #455a64;
  --text-light: #78909c;
  --border: #bbdefb;
  --shadow: 0 4px 20px rgba(21, 101, 192, 0.12);
  --shadow-hover: 0 8px 30px rgba(21, 101, 192, 0.2);
  --radius: 12px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans SC', sans-serif;
  background: var(--bg-light);
  color: var(--text-dark);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 15px rgba(21, 101, 192, 0.08);
  position: sticky;
  top: 0;
  z-index: 1000;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: 'ZCOOL XiaoWei', serif;
  font-size: 22px;
  font-weight: 700;
  color: var(--primary-dark);
}

.logo-icon {
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 22px;
}

.main-nav ul {
  display: flex;
  list-style: none;
  gap: 8px;
}

.main-nav a {
  display: block;
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-dark);
  transition: var(--transition);
}

.main-nav a:hover,
.main-nav a.active {
  background: var(--bg-light);
  color: var(--primary);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 12px 28px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  font-family: inherit;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  box-shadow: 0 4px 15px rgba(21, 101, 192, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(21, 101, 192, 0.4);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--primary);
  color: var(--primary);
}

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

.btn-ghost {
  background: transparent;
  color: var(--primary);
}

.btn-ghost:hover {
  background: var(--bg-light);
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  color: var(--primary);
  cursor: pointer;
}

/* Hero */
.hero {
  position: relative;
  padding: 80px 0 60px;
  overflow: hidden;
  background: linear-gradient(135deg, var(--bg-light) 0%, #fff 50%, #e0f7fa 100%);
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0, 172, 193, 0.15), transparent 70%);
  border-radius: 50%;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(21, 101, 192, 0.1), transparent 70%);
  border-radius: 50%;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-content h1 {
  font-family: 'ZCOOL XiaoWei', serif;
  font-size: 48px;
  line-height: 1.2;
  color: var(--primary-dark);
  margin-bottom: 20px;
}

.hero-content h1 span {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-content p {
  font-size: 18px;
  color: var(--text-gray);
  margin-bottom: 32px;
  line-height: 1.8;
}

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

.hero-stats {
  display: flex;
  gap: 32px;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-number {
  font-family: 'ZCOOL XiaoWei', serif;
  font-size: 32px;
  font-weight: 700;
  color: var(--primary);
}

.stat-label {
  font-size: 14px;
  color: var(--text-light);
}

.hero-visual {
  position: relative;
}

.browser-mockup {
  background: white;
  border-radius: 16px;
  box-shadow: var(--shadow);
  overflow: hidden;
  border: 1px solid var(--border);
}

.browser-toolbar {
  background: linear-gradient(180deg, #f5f5f5, #ebebeb);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid #ddd;
}

.browser-dots {
  display: flex;
  gap: 6px;
}

.browser-dots span {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.browser-dots span:nth-child(1) { background: #ff5f57; }
.browser-dots span:nth-child(2) { background: #febc2e; }
.browser-dots span:nth-child(3) { background: #28c840; }

.browser-url {
  flex: 1;
  background: white;
  border-radius: 20px;
  padding: 5px 14px;
  font-size: 12px;
  color: var(--text-gray);
  margin-left: 12px;
}

.browser-content {
  padding: 24px;
  min-height: 300px;
}

.toolbar-card {
  background: linear-gradient(135deg, var(--bg-light), #fff);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: var(--transition);
}

.toolbar-card:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow);
  border-color: var(--accent);
}

.toolbar-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  flex-shrink: 0;
}

.toolbar-icon.c1 { background: linear-gradient(135deg, #1565c0, #42a5f5); color: white; }
.toolbar-icon.c2 { background: linear-gradient(135deg, #00acc1, #26c6da); color: white; }
.toolbar-icon.c3 { background: linear-gradient(135deg, #66bb6a, #81c784); color: white; }
.toolbar-icon.c4 { background: linear-gradient(135deg, #ffa726, #ffb74d); color: white; }

.toolbar-info h4 {
  font-size: 15px;
  color: var(--primary-dark);
  margin-bottom: 4px;
}

.toolbar-info p {
  font-size: 13px;
  color: var(--text-light);
}

/* Sections */
.section {
  padding: 80px 0;
}

.section-alt {
  background: white;
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-header .tag {
  display: inline-block;
  background: var(--bg-light);
  color: var(--primary);
  padding: 6px 18px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 16px;
}

.section-header h2 {
  font-family: 'ZCOOL XiaoWei', serif;
  font-size: 36px;
  color: var(--primary-dark);
  margin-bottom: 12px;
}

.section-header p {
  font-size: 16px;
  color: var(--text-gray);
  max-width: 600px;
  margin: 0 auto;
}

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

.feature-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: transparent;
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin-bottom: 20px;
}

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

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

/* Tool Cards */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.tool-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  transition: var(--transition);
  cursor: pointer;
}

.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: var(--accent);
}

.tool-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--bg-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin: 0 auto 16px;
  transition: var(--transition);
}

.tool-card:hover .tool-icon {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
}

.tool-card h4 {
  font-size: 15px;
  color: var(--primary-dark);
  margin-bottom: 8px;
}

.tool-card p {
  font-size: 13px;
  color: var(--text-light);
}

.tool-filter {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 8px 20px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: white;
  color: var(--text-gray);
  font-size: 14px;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

/* Testimonials */
.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.testimonial-card {
  background: white;
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
}

.testimonial-stars {
  color: #ffb300;
  font-size: 18px;
  margin-bottom: 16px;
  letter-spacing: 2px;
}

.testimonial-card p {
  font-size: 15px;
  color: var(--text-gray);
  line-height: 1.8;
  margin-bottom: 20px;
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

.author-info strong {
  display: block;
  font-size: 14px;
  color: var(--primary-dark);
}

.author-info span {
  font-size: 12px;
  color: var(--text-light);
}

/* Download Section */
.download-hero {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary), var(--accent));
  color: white;
  border-radius: 24px;
  padding: 60px;
  text-align: center;
  margin: 40px auto;
  max-width: 1000px;
}

.download-hero h2 {
  font-family: 'ZCOOL XiaoWei', serif;
  font-size: 36px;
  margin-bottom: 16px;
}

.download-hero p {
  font-size: 17px;
  opacity: 0.9;
  margin-bottom: 32px;
}

.download-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.download-btn {
  background: rgba(255, 255, 255, 0.2);
  border: 2px solid rgba(255, 255, 255, 0.5);
  color: white;
  padding: 14px 32px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
  cursor: pointer;
  font-family: inherit;
}

.download-btn:hover {
  background: white;
  color: var(--primary);
  transform: translateY(-3px);
}

/* Tutorial */
.tutorial-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.tutorial-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.tutorial-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.tutorial-thumb {
  height: 180px;
  background: linear-gradient(135deg, var(--bg-light), #e0f7fa);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
  color: var(--primary);
}

.tutorial-body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.tutorial-category {
  display: inline-block;
  background: var(--bg-light);
  color: var(--primary);
  padding: 3px 12px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
  margin-bottom: 12px;
  align-self: flex-start;
}

.tutorial-body h3 {
  font-size: 18px;
  color: var(--primary-dark);
  margin-bottom: 10px;
}

.tutorial-body p {
  font-size: 14px;
  color: var(--text-gray);
  flex: 1;
  margin-bottom: 16px;
}

.tutorial-meta {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-light);
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-content h2 {
  font-family: 'ZCOOL XiaoWei', serif;
  font-size: 36px;
  color: var(--primary-dark);
  margin-bottom: 20px;
}

.about-content p {
  font-size: 16px;
  color: var(--text-gray);
  line-height: 1.9;
  margin-bottom: 16px;
}

.about-visual {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 24px;
  padding: 60px;
  text-align: center;
  color: white;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.about-stat {
  text-align: center;
  padding: 32px 16px;
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.about-stat .num {
  font-family: 'ZCOOL XiaoWei', serif;
  font-size: 36px;
  color: var(--primary);
  display: block;
}

.about-stat .lbl {
  font-size: 14px;
  color: var(--text-gray);
}

.timeline {
  position: relative;
  padding-left: 40px;
  margin-top: 40px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  padding-bottom: 32px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -32px;
  top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--primary);
  border: 3px solid var(--bg-light);
}

.timeline-year {
  font-family: 'ZCOOL XiaoWei', serif;
  font-size: 22px;
  color: var(--primary);
  margin-bottom: 6px;
}

.timeline-item h4 {
  font-size: 17px;
  color: var(--primary-dark);
  margin-bottom: 6px;
}

.timeline-item p {
  font-size: 14px;
  color: var(--text-gray);
}

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.contact-form {
  background: white;
  padding: 40px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--primary-dark);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 15px;
  font-family: inherit;
  transition: var(--transition);
  background: var(--bg-light);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  background: white;
  box-shadow: 0 0 0 3px rgba(21, 101, 192, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 140px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-card {
  background: white;
  padding: 28px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.contact-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}

.contact-card h4 {
  font-size: 16px;
  color: var(--primary-dark);
  margin-bottom: 6px;
}

.contact-card p {
  font-size: 14px;
  color: var(--text-gray);
}

/* Footer */
.site-footer {
  background: linear-gradient(180deg, #0d47a1, #062855);
  color: rgba(255, 255, 255, 0.85);
  padding: 60px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
}

.footer-brand .logo {
  color: white;
  margin-bottom: 16px;
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
  margin-bottom: 20px;
  opacity: 0.8;
}

.footer-social {
  display: flex;
  gap: 12px;
}

.footer-social a {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  transition: var(--transition);
}

.footer-social a:hover {
  background: var(--accent);
  transform: translateY(-3px);
}

.footer-col h4 {
  font-size: 15px;
  color: white;
  margin-bottom: 20px;
  font-weight: 600;
}

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

.footer-col li {
  margin-bottom: 10px;
}

.footer-col a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.75);
  transition: var(--transition);
}

.footer-col a:hover {
  color: var(--accent);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 24px 0;
  text-align: center;
  font-size: 13px;
  opacity: 0.7;
}

/* Page Header */
.page-header {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary), var(--accent));
  color: white;
  padding: 60px 0 50px;
  text-align: center;
}

.page-header h1 {
  font-family: 'ZCOOL XiaoWei', serif;
  font-size: 40px;
  margin-bottom: 12px;
}

.page-header p {
  font-size: 17px;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto;
}

.breadcrumb {
  margin-top: 20px;
  font-size: 14px;
  opacity: 0.8;
}

.breadcrumb a {
  color: white;
}

.breadcrumb a:hover {
  color: var(--accent);
}

.breadcrumb span {
  margin: 0 8px;
}

/* System Requirements */
.req-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 32px;
}

.req-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  text-align: center;
}

.req-card .ri {
  font-size: 36px;
  color: var(--primary);
  margin-bottom: 16px;
}

.req-card h4 {
  font-size: 16px;
  color: var(--primary-dark);
  margin-bottom: 12px;
}

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

/* Responsive */
@media (max-width: 1024px) {
  .hero-inner,
  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

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

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

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

  .tutorial-grid {
    grid-template-columns: 1fr;
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }

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

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

@media (max-width: 768px) {
  .main-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: white;
    box-shadow: var(--shadow);
    padding: 20px;
  }

  .main-nav.open {
    display: block;
  }

  .main-nav ul {
    flex-direction: column;
    gap: 4px;
  }

  .mobile-toggle {
    display: block;
  }

  .hero {
    padding: 50px 0 40px;
  }

  .hero-content h1 {
    font-size: 32px;
  }

  .hero-stats {
    gap: 20px;
    flex-wrap: wrap;
  }

  .section {
    padding: 60px 0;
  }

  .section-header h2 {
    font-size: 28px;
  }

  .feature-grid,
  .testimonial-grid {
    grid-template-columns: 1fr;
  }

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

  .download-hero {
    padding: 40px 24px;
  }

  .download-hero h2 {
    font-size: 26px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .req-grid {
    grid-template-columns: 1fr;
  }

  .about-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .about-stat {
    padding: 24px 12px;
  }

  .page-header {
    padding: 40px 0 30px;
  }

  .page-header h1 {
    font-size: 28px;
  }

  .contact-form {
    padding: 28px;
  }
}

@media (max-width: 480px) {
  .tool-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .about-stats {
    grid-template-columns: 1fr;
  }
}