```css
/* ===== CSS Reset & Root Variables ===== */
:root {
  --primary: #e50914;
  --primary-dark: #b0060e;
  --primary-light: #ff4d5a;
  --accent: #6366f1;
  --accent-glow: rgba(99, 102, 241, 0.35);
  --bg-light: #f4f6fb;
  --bg-card: rgba(255, 255, 255, 0.72);
  --bg-card-solid: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.45);
  --bg-gradient-light: linear-gradient(135deg, #e0e7ff 0%, #f4f6fb 50%, #ffe4e6 100%);
  --text-primary: #111827;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --border-light: rgba(148, 163, 184, 0.25);
  --border-strong: rgba(148, 163, 184, 0.45);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.12);
  --shadow-red: 0 8px 30px rgba(229, 9, 20, 0.15);
  --footer-bg: #0b1120;
  --footer-text: #94a3b8;
  --footer-heading: #f1f5f9;
  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 28px;
  --radius-full: 999px;
  --blur: blur(16px) saturate(180%);
  --transition-fast: 0.2s ease;
  --transition-med: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  --font-sans: "Inter", "SF Pro Display", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

[data-theme="dark"] {
  --bg-light: #0b1120;
  --bg-card: rgba(30, 41, 59, 0.75);
  --bg-card-solid: #1e293b;
  --bg-glass: rgba(15, 23, 42, 0.6);
  --bg-gradient-light: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #2d1b4e 100%);
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --border-light: rgba(148, 163, 184, 0.2);
  --border-strong: rgba(148, 163, 184, 0.4);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
  --shadow-red: 0 8px 30px rgba(229, 9, 20, 0.25);
  --footer-bg: #020617;
  --footer-text: #94a3b8;
  --footer-heading: #f1f5f9;
}

/* ===== Base Styles ===== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-gradient-light);
  background-attachment: fixed;
  color: var(--text-primary);
  line-height: 1.7;
  transition: background 0.4s ease, color 0.3s ease;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-image: 
    radial-gradient(circle at 15% 20%, rgba(99, 102, 241, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 85% 15%, rgba(229, 9, 20, 0.06) 0%, transparent 45%),
    radial-gradient(circle at 70% 80%, rgba(245, 158, 11, 0.05) 0%, transparent 40%);
}

[data-theme="dark"] body {
  background-image: 
    radial-gradient(circle at 15% 20%, rgba(99, 102, 241, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 85% 15%, rgba(229, 9, 20, 0.1) 0%, transparent 45%),
    radial-gradient(circle at 70% 80%, rgba(245, 158, 11, 0.08) 0%, transparent 40%);
}

img,
svg {
  display: block;
  max-width: 100%;
}

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

button {
  border: none;
  background: none;
  cursor: pointer;
  font-family: inherit;
  color: inherit;
}

ul,
ol {
  list-style: none;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

/* ===== Scrollbar Styling ===== */
::-webkit-scrollbar {
  width: 10px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--primary), var(--accent));
  border-radius: var(--radius-full);
  transition: background 0.3s ease;
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, var(--primary-dark), var(--accent));
}

::selection {
  background: var(--primary);
  color: white;
}

/* ===== Navbar ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-bottom: 1px solid var(--border-light);
  transition: all var(--transition-med);
  padding: 0;
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
  background: var(--bg-card);
}

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

.logo {
  font-size: 1.9rem;
  font-weight: 900;
  letter-spacing: -1px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-primary) 40%, var(--primary) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-decoration: none;
  position: relative;
  z-index: 1;
  transition: transform var(--transition-med);
}

.logo:hover {
  transform: scale(1.02);
}

.logo span {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-weight: 900;
}

.nav-links {
  display: flex;
  gap: 8px;
  align-items: center;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.nav-links a {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 8px 16px;
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  position: relative;
  letter-spacing: 0.2px;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: var(--radius-full);
  transition: width var(--transition-med);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
  background: rgba(229, 9, 20, 0.08);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 24px;
}

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

.theme-toggle,
.hamburger {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-light);
  background: var(--bg-card);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  transition: all var(--transition-fast);
  font-size: 1.1rem;
  cursor: pointer;
}

.theme-toggle:hover,
.hamburger:hover {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(229, 9, 20, 0.1);
  transform: translateY(-2px);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 10px;
}

.hamburger span {
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  border-radius: var(--radius-full);
  transition: all var(--transition-med);
  display: block;
}

.hamburger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== Hero Section ===== */
.hero-section {
  padding: 160px 0 100px;
  position: relative;
  overflow: hidden;
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(229, 9, 20, 0.08) 0%, transparent 70%);
  border-radius: 50%;
  animation: float 8s ease-in-out infinite;
}

.hero-section::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.08) 0%, transparent 70%);
  border-radius: 50%;
  animation: float 12s ease-in-out infinite reverse;
}

@keyframes float {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-20px) scale(1.05); }
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-copy {
  animation: fadeInUp 1s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, rgba(229, 9, 20, 0.1), rgba(99, 102, 241, 0.1));
  border: 1px solid rgba(229, 9, 20, 0.2);
  padding: 8px 20px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  animation: fadeInUp 1s ease-out 0.1s backwards;
}

.hero-badge span {
  color: var(--primary);
  font-weight: 800;
}

.hero-copy h1 {
  font-size: clamp(2.5rem, 5vw, 4.2rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 24px;
  letter-spacing: -1.5px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-primary) 60%, var(--primary) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: fadeInUp 1s ease-out 0.2s backwards;
}

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

.hero-copy p {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-bottom: 36px;
  max-width: 520px;
  line-height: 1.8;
  animation: fadeInUp 1s ease-out 0.3s backwards;
}

.btn-group {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  animation: fadeInUp 1s ease-out 0.4s backwards;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  padding: 16px 36px;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 1rem;
  box-shadow: var(--shadow-red);
  transition: all var(--transition-med);
  position: relative;
  overflow: hidden;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: none;
  cursor: pointer;
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.6s ease;
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 40px rgba(229, 9, 20, 0.3);
}

.btn-primary:hover::before {
  left: 100%;
}

.btn-outline {
  border: 2px solid var(--border-strong);
  color: var(--text-primary);
  padding: 15px 36px;
  border-radius: var(--radius-full);
  font-weight: 600;
  background: var(--bg-glass);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  transition: all var(--transition-med);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(229, 9, 20, 0.1);
}

.hero-visual {
  position: relative;
  animation: fadeInRight 1.2s ease-out 0.3s backwards;
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(40px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.hero-visual svg {
  width: 100%;
  height: auto;
  filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.15));
  transition: transform var(--transition-med);
}

.hero-visual:hover svg {
  transform: scale(1.02) rotate(-1deg);
}

.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 48px;
  padding: 24px 32px;
  background: var(--bg-glass);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  animation: fadeInUp 1s ease-out 0.5s backwards;
}

.stat-item {
  text-align: center;
}

.stat-item .number {
  font-size: 2rem;
  font-weight: 900;
  color: var(--text-primary);
  line-height: 1.2;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.stat-item .label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ===== Section Titles ===== */
.section-title {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 800;
  color: var(--text-primary);
  margin: 80px 0 40px;
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 16px;
  letter-spacing: -0.5px;
}

.section-title::before {
  content: '';
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  box-shadow: var(--shadow-red);
  flex-shrink: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white'%3E%3Cpath d='M8 5v14l11-7z'/%3E%3C/svg%3E");
  background-size: 24px;
  background-position: center;
  background-repeat: no-repeat;
}

.section-title::after {
  content: '';
  flex: 1;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), transparent);
  margin-left: 16px;
  min-width: 60px;
}

/* ===== Cards Grid ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.card {
  background: var(--bg-card);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-radius: var(--radius-md);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-med);
  border: 1px solid var(--border-light);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-med);
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-strong);
}

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

.card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-primary);
}

.card h3 .emoji {
  font-size: 1.5rem;
  background: linear-gradient(135deg, rgba(229, 9, 20, 0.1), rgba(99, 102, 241, 0.1));
  padding: 8px;
  border-radius: var(--radius-sm);
}

.card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ===== Article Rows ===== */
.article-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.article-row {
  background: var(--bg-card);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  border: 1px solid var(--border-light);
  border-left: 4px solid var(--primary);
  transition: all var(--transition-med);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.article-row::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(229, 9, 20, 0.03));
  pointer-events: none;
}

.article-row:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
  background: var(--bg-card-solid);
}

.article-row h4 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  transition: color var(--transition-fast);
}

.article-row:hover h4 {
  color: var(--primary);
}

.article-row .meta {
  display: flex;
  gap: 24px;
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-bottom: 12px;
  font-weight: 500;
}

.article-row .meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.article-row p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
  max-width: 90%;
}

.read-more {
  color: var(--primary);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 12px;
  transition: gap var(--transition-fast);
  font-size: 0.95rem;
}

.read-more:hover {
  gap: 10px;
}

/* ===== FAQ Accordion ===== */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--bg-card);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  overflow: hidden;
  transition: all var(--transition-med);
}

.faq-item:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  background: transparent;
  border: none;
  text-align: left;
}

.faq-question:hover {
  color: var(--primary);
}

.faq-question .faq-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(229, 9, 20, 0.1), rgba(99, 102, 241, 0.1));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: all var(--transition-med);
  flex-shrink: 0;
  color: var(--primary);
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-med);
}

.faq-answer-inner {
  padding: 0 24px 20px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  border-top: 1px solid var(--border-light);
  margin: 0 24px;
  padding-top: 16px;
}

/* ===== Tutorial Section ===== */
.tutorial-card {
  background: var(--bg-card);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-radius: var(--radius-lg);
  padding: 40px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-md);
}

.tutorial-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin: 32px 0;
}

.tutorial-step {
  padding: 24px;
  background: var(--bg-glass);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  transition: all var(--transition-med);
  position: relative;
}

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

.step-number {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 1.4rem;
  color: white;
  margin-bottom: 16px;
  box-shadow: var(--shadow-red);
}

.tutorial-step h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.tutorial-step p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.tutorial-note {
  background: linear-gradient(135deg, rgba(229, 9, 20, 0.05), rgba(99, 102, 241, 0.05));
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  margin-top: 24px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.tutorial-note .emoji {
  font-size: 1.2rem;
}

/* ===== Testimonials ===== */
.testimonial-card {
  background: var(--bg-card);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-radius: var(--radius-md);
  padding: 32px;
  border: 1px solid var(--border-light);
  transition: all var(--transition-med);
  position: relative;
}

.testimonial-card::before {
  content: '"';
  font-size: 6rem;
  color: var(--primary);
  opacity: 0.1;
  position: absolute;
  top: -10px;
  left: 20px;
  font-family: Georgia, serif;
  line-height: 1;
}

.testimonial-card:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: var(--shadow-lg);
}

.testimonial-card .avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 800;
  color: white;
  margin-bottom: 16px;
  box-shadow: var(--shadow-red);
}

.testimonial-card h4 {
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
  font-size: 1.1rem;
}

.testimonial-card p {
  color: var(--text-secondary);
  font-style: italic;
  line-height: 1.8;
  font-size: 0.95rem;
}

.testimonial-card .stars {
  color: #f59e0b;
  margin-top: 12px;
  letter-spacing: 2px;
}

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

.contact-info {
  background: var(--bg-card);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-radius: var(--radius-lg);
  padding: 40px;
  border: 1px solid var(--border-light);
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border-light);
}

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

.contact-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(229, 9, 20, 0.1), rgba(99, 102, 241, 0.1));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  flex-shrink: 0;
}

.contact-item h5 {
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--text-primary);
}

.contact-item p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.contact-links a {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  font-size: 0.95rem;
}

.contact-links a:hover {
  color: var(--primary);
}

/* ===== Footer ===== */
.footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  padding: 80px 0 40px;
  margin-top: 100px;
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(229, 9, 20, 0.5), transparent);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 48px;
  margin-bottom: 48px;
}

.footer-col h5 {
  color: var(--footer-heading);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 20px;
  position: relative;
  padding-bottom: 12px;
}

.footer-col h5::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 32px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: var(--radius-full);
}

.footer-col a {
  color: var(--footer-text);
  display: block;
  margin-bottom: 12px;
  transition: all var(--transition-fast);
  font-size: 0.95rem;
  opacity: 0.8;
}

.footer-col a:hover {
  color: white;
  transform: translateX(4px);
  opacity: 1;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.copyright {
  color: var(--footer-text);
  font-size: 0.9rem;
  opacity: 0.7;
}

.footer-bottom-links {
  display: flex;
  gap: 24px;
}

.footer-bottom-links a {
  color: var(--footer-text);
  font-size: 0.9rem;
  opacity: 0.7;
  transition: opacity var(--transition-fast);
}

.footer-bottom-links a:hover {
  opacity: 1;
  color: white;
}

/* ===== Back to Top ===== */
.back-to-top {
  position: fixed;
  bottom: 40px;
  right: 30px;
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: white;
  font-size: 1.5rem;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-med);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  border: none;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(229, 9, 20, 0.3);
}

/* ===== Scroll Animations ===== */
.fade-in-section {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

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

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-copy p {
    margin-left: auto;
    margin-right: auto;
  }
  
  .hero-visual {
    max-width: 500px;
    margin: 0 auto;
  }
  
  .hero-stats {
    justify-content: center;
  }
  
  .section-title {
    font-size: 1.8rem;
  }
  
  .tutorial-steps {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }
  
  .nav-links {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--bg-card-solid);
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    flex-direction: column;
    padding: 24px;
    display: none;
    border-bottom: 1px solid var(--border-light);
    box-shadow: var(--shadow-lg);
    transform: none;
    z-index: 999;
    align-items: stretch;
    gap: 4px;
  }
  
  .nav-links.active {
    display: flex;
    animation: slideDown 0.4s ease;
  }
  
  @keyframes slideDown {
    from {
      opacity: 0;
      transform: translateY(-20px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
  
  .nav-links a {
    padding: 14px 20px;
    border-radius: var(--radius-sm);
    font-size: 1rem;
  }
  
  .nav-links a::after {
    display: none;
  }
  
  .hamburger {
    display: flex;
  }
  
  .hero-section {
    padding: 120px 0 60px;
  }
  
  .hero-copy h1 {
    font-size: 2.2rem;
  }
  
  .hero-copy p {
    font-size: 1rem;
  }
  
  .hero-stats {
    flex-direction: column;
    gap: 16px;
    padding: 20px;
  }
  
  .stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  .btn-group {
    justify-content: center;
  }
  
  .btn-primary,
  .btn-outline {
    padding: 14px 28px;
    font-size: 0.95rem;
  }
  
  .card-grid {
    grid-template-columns: 1fr;
  }
  
  .section-title {
    font-size: 1.5rem;
    margin: 60px 0 30px;
  }
  
  .section-title::before {
    width: 40px;
    height: 40px;
  }
  
  .article-row {
    padding: 20px;
  }
  
  .article-row p {
    max-width: 100%;
  }
  
  .faq-question {
    font-size: 0.95rem;
    padding: 16px 20px;
  }
  
  .tutorial-card {
    padding: 24px;
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  
  .footer-bottom-links {
    justify-content: center;
  }
  
  .back-to-top {
    bottom: 24px;
    right: 20px;
    width: 44px;
    height: 44px;
    font-size: 1.2rem;
  }
}

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .hero-badge {
    font-size: 0.8rem;
    padding: 6px 14px;
  }
  
  .hero-copy h1 {
    font-size: 1.9rem;
    letter-spacing: -0.5px;
  }
  
  .btn-group {
    flex-direction: column;
    width: 100%;
  }
  
  .btn-primary,
  .btn-outline {
    width: 100%;
    justify-content: center;
  }
  
  .contact-item {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .article-row .meta {
    flex-direction: column;
    gap: 4px;
  }
}

/* ===== Print Styles ===== */
@media print {
  .navbar,
  .back-to-top,
  .footer,
  .btn-group {
    display: none !important;
  }
  
  body {
    background: white;
  }
  
  .hero-section {
    min-height: auto;
    padding: 20px 0;
  }
}
```