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

:root {
  --blue: #3584e4;
  --blue-dark: #1c71d8;
  --bg: #fafafa;
  --bg-card: #ffffff;
  --bg-code: #f0f0f0;
  --text: #1e1e1e;
  --text-secondary: #5e5e5e;
  --border: #e0e0e0;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-hover: 0 4px 12px rgba(0,0,0,0.1);
  --radius: 12px;
  --max-width: 1100px;
  --nav-height: 64px;
  --transition: 0.2s ease;
}

[data-theme="dark"] {
  --bg: #1e1e1e;
  --bg-card: #2a2a2a;
  --bg-code: #333;
  --text: #f0f0f0;
  --text-secondary: #a0a0a0;
  --border: #404040;
  --shadow: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-hover: 0 4px 12px rgba(0,0,0,0.4);
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background var(--transition), color var(--transition);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--blue); text-decoration: none; transition: opacity var(--transition); }
a:hover { opacity: 0.8; }

/* === Nav === */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
  transition: background var(--transition), border-color var(--transition);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
}

.nav-brand span { font-size: 1.4rem; }

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

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition);
}

.nav-links a:hover, .nav-links a.active { color: var(--blue); opacity: 1; }

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 38px;
  height: 38px;
  cursor: pointer;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color var(--transition), background var(--transition);
}

.theme-toggle:hover { background: var(--bg-card); }

/* === Hamburger (mobile) === */
.hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 38px;
  height: 38px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

/* === Container === */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; width: 100%; }

main { flex: 1; }

/* === Hero === */
.hero {
  text-align: center;
  padding: 80px 24px 60px;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 16px;
}

.hero .subtitle {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 32px;
}

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

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.btn:hover { transform: translateY(-1px); }

.btn-primary {
  background: var(--blue);
  color: #fff;
}

.btn-primary:hover { background: var(--blue-dark); color: #fff; opacity: 1; }

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

.btn-secondary:hover { box-shadow: var(--shadow); }

/* === Section === */
.section {
  padding: 60px 0;
}

.section-title {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 40px;
  max-width: 600px;
}

/* === App Grid === */
.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.app-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: box-shadow var(--transition), transform var(--transition), background var(--transition), border-color var(--transition);
}

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

.app-card .icon {
  width: 64px;
  height: 64px;
  margin-bottom: 12px;
  display: block;
  border-radius: 14px;
}

.app-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.app-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 12px;
}

.app-card .learn-more {
  font-size: 0.85rem;
  font-weight: 600;
}

/* === Getting Started === */
.getting-started {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px;
  transition: background var(--transition), border-color var(--transition);
}

.getting-started h2 { margin-bottom: 16px; }

.getting-started p {
  color: var(--text-secondary);
  max-width: 700px;
  margin-bottom: 12px;
}

/* === Install Page === */
.install-methods {
  display: grid;
  gap: 24px;
}

.method-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: background var(--transition), border-color var(--transition);
}

.method-card h3 {
  font-size: 1.3rem;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.method-card .badge {
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: 20px;
  font-weight: 600;
  background: var(--blue);
  color: #fff;
}

.method-card .badge.secondary {
  background: var(--bg-code);
  color: var(--text-secondary);
}

.method-card > p {
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.pros-cons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 20px;
}

.pros-cons ul {
  list-style: none;
  font-size: 0.9rem;
}

.pros-cons li {
  padding: 4px 0;
  color: var(--text-secondary);
}

.pros-cons li::before { margin-right: 6px; }
.pros li::before { content: "✓"; color: #2ec27e; font-weight: 700; }
.cons li::before { content: "✗"; color: #e66100; font-weight: 700; }

pre {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 20px;
  overflow-x: auto;
  font-size: 0.88rem;
  line-height: 1.7;
  transition: background var(--transition), border-color var(--transition);
  position: relative;
}

code {
  font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
}

.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 0.78rem;
  cursor: pointer;
  color: var(--text-secondary);
  transition: background var(--transition);
}

.copy-btn:hover { background: var(--border); }

/* === Comparison Table === */
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 24px;
  font-size: 0.92rem;
}

.comparison-table th,
.comparison-table td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.comparison-table th {
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
}

.comparison-table td { color: var(--text-secondary); }

.comparison-table tr:hover td { color: var(--text); }

/* === Support Page === */
.support-hero {
  text-align: center;
  padding: 80px 24px 40px;
}

.support-hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  margin-bottom: 16px;
}

.support-hero p {
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
  font-size: 1.1rem;
}

.support-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 48px;
  text-align: center;
  max-width: 520px;
  margin: 0 auto;
  transition: background var(--transition), border-color var(--transition);
}

.support-card h2 { margin-bottom: 12px; }

.support-card p {
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.support-card .amount {
  font-size: 3rem;
  font-weight: 800;
  color: var(--blue);
  margin-bottom: 8px;
}

.support-card .amount-label {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 24px;
}

.btn-support {
  background: var(--blue);
  color: #fff;
  font-size: 1.1rem;
  padding: 16px 40px;
  border-radius: 12px;
  font-weight: 700;
  border: none;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-support:hover {
  background: var(--blue-dark);
  transform: translateY(-1px);
  color: #fff;
  opacity: 1;
}

.support-details {
  margin-top: 48px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.support-detail {
  text-align: center;
  padding: 24px;
}

.support-detail .detail-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.support-detail h3 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.support-detail p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* === Footer === */
footer {
  border-top: 1px solid var(--border);
  padding: 40px 24px;
  text-align: center;
  margin-top: 60px;
  transition: border-color var(--transition);
}

footer p {
  color: var(--text-secondary);
  font-size: 0.88rem;
  margin-bottom: 8px;
}

footer .footer-links {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-top: 12px;
}

footer .footer-links a {
  color: var(--text-secondary);
  font-size: 0.88rem;
}

footer .footer-links a:hover { color: var(--blue); }

/* === Thank You Banner === */
.thank-you-banner {
  background: #2ec27e;
  color: #fff;
  text-align: center;
  padding: 16px 24px;
  font-size: 1rem;
  border-radius: var(--radius);
  max-width: var(--max-width);
  margin: 24px auto 0;
}

/* === Mobile === */
@media (max-width: 768px) {
  .hamburger { display: flex; }

  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg);
    flex-direction: column;
    padding: 32px 24px;
    gap: 20px;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    z-index: 99;
  }

  .nav-links.open { transform: translateX(0); }

  .nav-links a { font-size: 1.2rem; }

  .hero { padding: 48px 24px 40px; }

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

  .getting-started { padding: 24px; }

  .method-card { padding: 24px; }

  .pros-cons { grid-template-columns: 1fr; }

  .support-card { padding: 32px 24px; }

  .comparison-wrapper { overflow-x: auto; }
}