/* ============================================
   Soul Agent Launcher 官网 - Win11 云母渐变风格
   参考 Soul Agent 客户端设计
   ============================================ */

:root {
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  
  /* Win11 Light Theme */
  --bg-primary: #f0f0f0;
  --bg-secondary: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.72);
  --bg-hover: rgba(0, 0, 0, 0.04);
  --bg-acrylic: rgba(255, 255, 255, 0.68);
  --bg-mica: rgba(243, 243, 243, 0.9);
  --text-primary: #1a1a1a;
  --text-secondary: #666666;
  --text-tertiary: #999999;
  --border-subtle: rgba(0, 0, 0, 0.08);
  --accent: #0078d4;
  --accent-hover: #106ebe;
  --accent-light: rgba(0, 120, 212, 0.12);
  --danger: #d32f2f;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
}

[data-theme="dark"] {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16162a;
  --bg-card: rgba(30, 30, 54, 0.78);
  --bg-hover: rgba(255, 255, 255, 0.06);
  --bg-acrylic: rgba(26, 26, 46, 0.78);
  --bg-mica: rgba(26, 26, 46, 0.88);
  --text-primary: #e0e0e0;
  --text-secondary: #a0a0b0;
  --text-tertiary: #707080;
  --border-subtle: rgba(255, 255, 255, 0.08);
  --accent: #60cdff;
  --accent-hover: #3b82f6;
  --accent-light: rgba(96, 205, 255, 0.15);
  --danger: #ef5350;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
}

/* --- Dynamic Gradient Animations --- */
@keyframes gradientShift {
  0%, 100% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
}

@keyframes orbMove1 {
  0%, 100% {
    transform: translate(0, 0) scale(1);
    opacity: 0.18;
  }
  25% {
    transform: translate(50px, -30px) scale(1.1);
    opacity: 0.22;
  }
  50% {
    transform: translate(30px, 50px) scale(0.95);
    opacity: 0.15;
  }
  75% {
    transform: translate(-40px, 20px) scale(1.05);
    opacity: 0.2;
  }
}

@keyframes orbMove2 {
  0%, 100% {
    transform: translate(0, 0) scale(1);
    opacity: 0.15;
  }
  25% {
    transform: translate(-60px, 40px) scale(1.15);
    opacity: 0.12;
  }
  50% {
    transform: translate(-20px, -50px) scale(0.9);
    opacity: 0.18;
  }
  75% {
    transform: translate(50px, -30px) scale(1.08);
    opacity: 0.1;
  }
}

@keyframes orbMove3 {
  0%, 100% {
    transform: translate(0, 0) scale(1);
    opacity: 0.12;
  }
  33% {
    transform: translate(40px, 60px) scale(1.1);
    opacity: 0.15;
  }
  66% {
    transform: translate(-50px, -40px) scale(0.95);
    opacity: 0.08;
  }
}

@keyframes titleGradient {
  0%, 100% {
    background-position: 0% 50%;
    filter: hue-rotate(0deg);
  }
  50% {
    background-position: 100% 50%;
    filter: hue-rotate(15deg);
  }
}

@keyframes btnGradient {
  0%, 100% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
}

/* --- Mica Background --- */
.mica-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.mica-bg::before {
  content: '';
  position: absolute;
  width: 600px;
  height: 600px;
  top: -100px;
  left: -100px;
  background: radial-gradient(circle, rgba(0, 60, 136, 0.25) 0%, transparent 70%);
  animation: orbMove1 15s ease-in-out infinite;
}

.mica-bg::after {
  content: '';
  position: absolute;
  width: 500px;
  height: 500px;
  top: 20%;
  right: -100px;
  background: radial-gradient(circle, rgba(0, 120, 212, 0.2) 0%, transparent 70%);
  animation: orbMove2 12s ease-in-out infinite;
}

.mica-orb-1 {
  position: absolute;
  width: 400px;
  height: 400px;
  bottom: 10%;
  left: 20%;
  background: radial-gradient(circle, rgba(96, 205, 255, 0.18) 0%, transparent 70%);
  animation: orbMove3 18s ease-in-out infinite;
}

.mica-orb-2 {
  position: absolute;
  width: 350px;
  height: 350px;
  top: 40%;
  right: 10%;
  background: radial-gradient(circle, rgba(135, 206, 250, 0.12) 0%, transparent 70%);
  animation: orbMove1 20s ease-in-out infinite reverse;
}

.mica-base {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, var(--bg-primary) 0%, rgba(240, 248, 255, 0.5) 50%, var(--bg-primary) 100%);
  animation: gradientShift 20s ease infinite;
  background-size: 200% 200%;
}

/* --- Acrylic Effects --- */
.acrylic {
  backdrop-filter: blur(24px) saturate(1.2);
  -webkit-backdrop-filter: blur(24px) saturate(1.2);
  background: var(--bg-acrylic);
}

/* --- Fade-in Animation --- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-fade-in {
  opacity: 0;
  animation: fadeInUp 0.8s ease-out forwards;
}

/* --- Scroll-triggered Animation --- */
.scroll-animate {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.scroll-animate.visible {
  opacity: 1;
  transform: translateY(0);
}

.animate-delay-1 { animation-delay: 0.1s; }
.animate-delay-2 { animation-delay: 0.2s; }
.animate-delay-3 { animation-delay: 0.3s; }
.animate-delay-4 { animation-delay: 0.4s; }
.animate-delay-4-5 { animation-delay: 0.45s; }
.animate-delay-5 { animation-delay: 0.5s; }
.animate-delay-6 { animation-delay: 0.6s; }
.animate-delay-7 { animation-delay: 0.7s; }
.animate-delay-8 { animation-delay: 0.8s; }
.animate-delay-9 { animation-delay: 0.9s; }
.animate-delay-10 { animation-delay: 1.0s; }
.animate-delay-11 { animation-delay: 1.1s; }
.animate-delay-12 { animation-delay: 1.2s; }
.animate-delay-13 { animation-delay: 1.3s; }
.animate-delay-14 { animation-delay: 1.4s; }
.animate-delay-15 { animation-delay: 1.5s; }
.animate-delay-16 { animation-delay: 1.6s; }
.animate-delay-17 { animation-delay: 1.7s; }
.animate-delay-18 { animation-delay: 1.8s; }
.animate-delay-19 { animation-delay: 1.9s; }
.animate-delay-20 { animation-delay: 2.0s; }
.animate-delay-21 { animation-delay: 2.1s; }
.animate-delay-22 { animation-delay: 2.2s; }

/* --- Header Navigation --- */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(24px) saturate(1.2);
  -webkit-backdrop-filter: blur(24px) saturate(1.2);
  background: var(--bg-acrylic);
  border-bottom: 1px solid var(--border-subtle);
  padding: 12px 24px;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--text-primary);
}

.nav-logo img {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  position: relative;
  z-index: 101;
}

.nav-logo span {
  font-size: 16px;
  font-weight: 600;
}

.nav-links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

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

.download-btn {
  background: linear-gradient(270deg, #004a8c, #0078d4, #1a9fff, #60cdff, #004a8c);
  background-size: 400% 400%;
  animation: btnGradient 8s ease infinite;
  color: white;
  padding: 8px 20px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
  border: none;
}

.download-btn:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

/* --- Hero Section --- */
.hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 15px 24px;
  text-align: center;
  position: relative;
  z-index: 1;
}

.version-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background: linear-gradient(135deg, rgba(0, 120, 212, 0.15), rgba(96, 205, 255, 0.1));
  background-size: 200% 200%;
  animation: gradientShift 5s ease infinite;
  border-radius: 20px;
  font-size: 12px;
  color: var(--accent);
  margin-bottom: 24px;
}

.hero h1 {
  font-size: 48px;
  font-weight: 700;
  margin-bottom: 16px;
  color: #0078d4;
}

[data-theme="dark"] .hero h1 {
  background: linear-gradient(270deg, #4da6ff, #60cdff, #b3e5fc, #87cefa, #4da6ff);
  background-size: 400% 400%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: titleGradient 10s ease infinite;
}

.hero .subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 16px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-highlight {
  font-size: 15px;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto 32px;
  line-height: 1.8;
  background: linear-gradient(135deg, rgba(0, 120, 212, 0.1), rgba(96, 205, 255, 0.08));
  padding: 16px 24px;
  border-radius: var(--radius-md);
  border-left: 3px solid var(--accent);
}

.hero-buttons {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.2s;
  border: 1px solid var(--border-subtle);
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(270deg, #004a8c, #0078d4, #1a9fff, #60cdff, #004a8c);
  background-size: 400% 400%;
  animation: btnGradient 8s ease infinite;
  color: white;
  border: none;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

.btn-secondary:hover {
  background: var(--bg-hover);
  border-color: var(--accent);
}

/* --- Features Section --- */
.features {
  padding: 80px 24px;
  position: relative;
  z-index: 1;
}

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

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-header h2 {
  font-size: 32px;
  font-weight: 600;
  margin-bottom: 12px;
}

.section-header p {
  font-size: 16px;
  color: var(--text-secondary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

.feature-card {
  backdrop-filter: blur(20px) saturate(1.2);
  -webkit-backdrop-filter: blur(20px) saturate(1.2);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all 0.2s;
}

.feature-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, rgba(0, 120, 212, 0.2), rgba(96, 205, 255, 0.15));
  background-size: 200% 200%;
  animation: gradientShift 6s ease infinite;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  color: var(--accent);
}

.feature-icon svg {
  width: 24px;
  height: 24px;
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

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

.feature-card ul {
  margin: 12px 0 0 0;
  padding-left: 20px;
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.8;
}

.feature-card ul li {
  margin-bottom: 6px;
}

.feature-card ul li::marker {
  color: var(--accent);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0 0 0;
  font-size: 13px;
}

.comparison-table thead {
  background: var(--bg-hover);
}

.comparison-table th {
  padding: 8px 12px;
  text-align: left;
  font-weight: 600;
  color: var(--text-primary);
  border-bottom: 2px solid var(--border);
  font-size: 12px;
}

.comparison-table td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.comparison-table tbody tr:hover {
  background: var(--bg-hover);
}

.comparison-table tbody tr:first-child td {
  color: var(--accent);
  font-weight: 600;
}

/* --- Quick Start Section --- */
.quick-start {
  padding: 60px 24px;
  position: relative;
  z-index: 1;
}

.steps-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}

.step-card {
  backdrop-filter: blur(20px) saturate(1.2);
  -webkit-backdrop-filter: blur(20px) saturate(1.2);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  text-align: center;
  position: relative;
}

.step-number {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 24px;
  background: linear-gradient(270deg, #004a8c, #0078d4, #1a9fff, #60cdff, #004a8c);
  background-size: 400% 400%;
  animation: btnGradient 6s ease infinite;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 12px;
  font-weight: 600;
}

.step-card h4 {
  font-size: 16px;
  font-weight: 600;
  margin-top: 8px;
  margin-bottom: 8px;
}

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

/* --- Download Section --- */
.download-section {
  padding: 60px 24px;
  position: relative;
  z-index: 1;
  background: linear-gradient(270deg, rgba(0, 60, 136, 0.15), rgba(0, 120, 212, 0.18), rgba(96, 205, 255, 0.12), rgba(0, 80, 160, 0.15), rgba(0, 60, 136, 0.15));
  background-size: 400% 400%;
  animation: gradientShift 12s ease infinite;
}

[data-theme="dark"] .download-section {
  background: linear-gradient(270deg, rgba(30, 80, 160, 0.15), rgba(96, 205, 255, 0.15), rgba(59, 130, 246, 0.12), rgba(30, 100, 180, 0.18), rgba(30, 80, 160, 0.15));
  background-size: 400% 400%;
  animation: gradientShift 12s ease infinite;
}

.download-section .section-header h2 {
  color: var(--text-primary);
  font-size: 32px;
  font-weight: 600;
  font-family: inherit;
  background: none;
  -webkit-background-clip: text;
  -webkit-text-fill-color: inherit;
  background-clip: text;
}

.download-section .section-header p {
  color: var(--text-primary);
  opacity: 0.8;
}

.backend-grid {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 32px;
}

.backend-card {
  backdrop-filter: blur(20px) saturate(1.2);
  -webkit-backdrop-filter: blur(20px) saturate(1.2);
  background: linear-gradient(135deg, rgba(0, 120, 212, 0.08), rgba(96, 205, 255, 0.05));
  background-size: 200% 200%;
  animation: gradientShift 8s ease infinite;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 20px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.backend-card:hover,
.backend-card.selected {
  border-color: var(--accent);
  background: linear-gradient(135deg, rgba(0, 120, 212, 0.15), rgba(96, 205, 255, 0.1));
  background-size: 200% 200%;
  animation: gradientShift 4s ease infinite;
  transform: translateY(-2px);
}

.backend-card h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
}

.backend-card p {
  font-size: 12px;
  color: var(--text-tertiary);
  margin-bottom: 8px;
}

.recommend-badge {
  display: inline-block;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 500;
  color: white;
  background: linear-gradient(135deg, #0078d4, #00a8ff);
  border-radius: 20px;
  margin-top: auto;
}

.coming-soon-badge {
  display: inline-block;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-tertiary);
  background: rgba(0, 0, 0, 0.06);
  border-radius: 20px;
  margin-top: auto;
}

.backend-card.disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.backend-card.disabled:hover {
  transform: none;
  border-color: var(--border);
  background: linear-gradient(135deg, rgba(0, 120, 212, 0.08), rgba(96, 205, 255, 0.05));
}

.download-buttons {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.download-buttons .btn-primary {
  background: linear-gradient(135deg, #0078d4, #00a8ff) !important;
  color: white !important;
  background-size: 200% 200% !important;
  animation: gradientShift 8s ease infinite !important;
  border: none !important;
  box-shadow: var(--shadow-md) !important;
}

.download-buttons .btn-secondary {
  background: var(--bg-card);
  color: var(--text-secondary);
}

.btn-small {
  font-size: 13px;
  padding: 8px 16px;
  background: transparent;
  color: var(--text-tertiary);
  border: 1px dashed var(--border);
}

.btn-small:hover {
  background: var(--bg-hover);
  color: var(--text-secondary);
  border-color: var(--accent);
}

.download-tip {
  font-size: 12px;
  color: var(--text-tertiary);
  text-align: center;
  margin-top: 16px;
  opacity: 0.7;
}

/* --- Tutorial Page --- */
.tutorial-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 80px 24px 60px;
  position: relative;
  z-index: 1;
}

.tutorial-header {
  text-align: center;
  margin-bottom: 48px;
}

.tutorial-header h1 {
  font-size: 36px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.tutorial-header p {
  font-size: 14px;
  color: var(--text-tertiary);
}

.tutorial-content {
  background: var(--bg-card);
  border-radius: 16px;
  padding: 40px;
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-lg);
}

.tutorial-section {
  margin-bottom: 48px;
  scroll-margin-top: 24px;
}

.tutorial-section:last-child {
  margin-bottom: 0;
}

.tutorial-section h2 {
  font-size: 24px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--border);
}

.tutorial-section h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-secondary);
  margin: 24px 0 16px;
}

.tutorial-toc {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
}

.tutorial-toc li a {
  display: block;
  padding: 12px 16px;
  background: var(--bg-hover);
  border-radius: 8px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  transition: all 0.2s;
}

.tutorial-toc li a:hover {
  background: var(--accent);
  color: white;
  transform: translateX(4px);
}

.tutorial-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 14px;
}

.tutorial-table thead {
  background: var(--bg-hover);
}

.tutorial-table th {
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  color: var(--text-primary);
  border-bottom: 2px solid var(--border);
}

.tutorial-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.tutorial-table tbody tr:hover {
  background: var(--bg-hover);
}

.tutorial-code {
  background: #1e1e1e;
  color: #d4d4d4;
  padding: 16px;
  border-radius: 8px;
  font-family: 'Consolas', 'Monaco', monospace;
  font-size: 13px;
  overflow-x: auto;
  margin: 16px 0;
  line-height: 1.6;
}

.tutorial-tip,
.tutorial-warning {
  padding: 16px;
  border-radius: 8px;
  margin: 16px 0;
  font-size: 14px;
  line-height: 1.6;
}

.tutorial-tip {
  background: rgba(0, 120, 212, 0.08);
  border-left: 3px solid var(--accent);
  color: var(--text-secondary);
}

.tutorial-warning {
  background: rgba(255, 140, 0, 0.08);
  border-left: 3px solid #ff8c00;
  color: var(--text-secondary);
}

.tutorial-section ul,
.tutorial-section ol {
  margin: 16px 0;
  padding-left: 24px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.tutorial-section li {
  margin-bottom: 8px;
}

.tutorial-section p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin: 16px 0;
}

.tutorial-section a {
  color: var(--accent);
  text-decoration: none;
}

.tutorial-section a:hover {
  text-decoration: underline;
}

/* --- Footer --- */
.footer {
  padding: 32px 24px;
  border-top: 1px solid var(--border-subtle);
  position: relative;
  z-index: 1;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
  color: var(--text-tertiary);
  font-size: 14px;
}

.footer-content a {
  color: var(--accent);
  text-decoration: none;
}

.footer-content a:hover {
  text-decoration: underline;
}

/* --- Theme Toggle --- */
.theme-toggle {
  display: none;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .header {
    padding: 12px 16px;
  }
  
  .nav-links {
    display: none;
  }
  
  .hero h1 {
    font-size: 32px;
  }
  
  .hero .subtitle {
    font-size: 16px;
  }
  
  .btn {
    padding: 10px 20px;
    font-size: 14px;
  }
  
  .features-grid,
  .steps-container {
    grid-template-columns: 1fr;
  }
}