:root {
  --bg: #f5f5f7;
  --card: rgba(0,0,0,0.03);
  --card-border: rgba(0,0,0,0.06);
  --text: #1d1d1f;
  --text2: #6e6e73;
  --accent: #3b82f6;
  --accent-glow: rgba(59,130,246,0.1);
  --nav-bg: rgba(245,245,247,0.72);
  --nav-border: rgba(0,0,0,0.06);
  --mobile-nav-bg: rgba(255,255,255,0.95);
  --mobile-nav-border: rgba(0,0,0,0.06);
}
:root[data-theme="dark"] {
  --bg: #050505;
  --card: rgba(255,255,255,0.04);
  --card-border: rgba(255,255,255,0.08);
  --text: #f5f5f7;
  --text2: #86868b;
  --accent: #3b82f6;
  --accent-glow: rgba(59,130,246,0.15);
  --nav-bg: rgba(5,5,5,0.72);
  --nav-border: rgba(255,255,255,0.06);
  --mobile-nav-bg: rgba(10,10,10,0.95);
  --mobile-nav-border: rgba(255,255,255,0.06);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --bg: #050505;
    --card: rgba(255,255,255,0.04);
    --card-border: rgba(255,255,255,0.08);
    --text: #f5f5f7;
    --text2: #86868b;
    --accent: #3b82f6;
    --accent-glow: rgba(59,130,246,0.15);
    --nav-bg: rgba(5,5,5,0.72);
    --nav-border: rgba(255,255,255,0.06);
    --mobile-nav-bg: rgba(10,10,10,0.95);
    --mobile-nav-border: rgba(255,255,255,0.06);
  }
}

* { -webkit-tap-highlight-color: transparent; }

.btn-nav {
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 12px;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all 0.3s ease;
  letter-spacing: 0.01em;
}
.btn-login {
  background: var(--accent);
  color: #fff;
  font-weight: 600;
}
.btn-login:hover { background: #60a5fa; transform: scale(1.02); }
.btn-register {
  background: transparent;
  color: var(--text2);
  border: 1px solid var(--card-border);
}
.btn-register:hover { border-color: var(--text2); color: var(--text); }
.theme-toggle-mobile {
  display: none;
  position: absolute;
  right: 56px;
  top: 8px;
  z-index: 102;
}
.user-info { display: flex; align-items: center; gap: 10px; }
.user-info img { width: 28px; height: 28px; border-radius: 50%; object-fit: cover; }
.user-info span { font-size: 13px; color: var(--text); }
.btn-logout {
  background: transparent;
  color: var(--text2);
  border: 1px solid var(--card-border);
  font-size: 11px;
  padding: 4px 10px;
  border-radius: 14px;
}

:root[data-theme="dark"] .glow-orb { opacity: 0.35; }
.glow-1 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(59,130,246,0.3), transparent 70%);
  top: -10%;
  left: -10%;
  animation-delay: 0s;
}
.glow-2 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(99,102,241,0.25), transparent 70%);
  top: 30%;
  right: -15%;
  animation-delay: -7s;
}
.glow-3 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(56,189,248,0.2), transparent 70%);
  bottom: -5%;
  left: 30%;
  animation-delay: -14s;
}

.hero {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 120px 24px 80px;
  text-align: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  border-radius: 20px;
  background: var(--card);
  border: 1px solid var(--card-border);
  font-size: 13px;
  color: var(--text2);
  margin-bottom: 24px;
  backdrop-filter: blur(10px);
}
.hero-badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #34d399;
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}
.hero h1 {
  font-size: clamp(48px, 10vw, 80px);
  font-weight: 700;
  letter-spacing: -2px;
  line-height: 1.05;
  background: linear-gradient(135deg, var(--text) 0%, var(--text2) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 20px;
}
.hero p {
  font-size: clamp(16px, 2.5vw, 20px);
  color: var(--text2);
  max-width: 500px;
  line-height: 1.6;
  letter-spacing: -0.01em;
}
.hero-actions { display: flex; gap: 12px; margin-top: 40px; }
.btn-hero {
  padding: 12px 28px;
  border-radius: 24px;
  font-size: 15px;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all 0.3s ease;
  font-weight: 500;
}
.btn-hero-primary { background: var(--accent); color: #fff; }
.btn-hero-primary:hover { background: #2563eb; transform: translateY(-1px); box-shadow: 0 8px 30px var(--accent-glow); }
.btn-hero-secondary {
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--card-border);
}
.btn-hero-secondary:hover { background: rgba(0,0,0,0.06); transform: translateY(-1px); }

.section {
  position: relative;
  z-index: 1;
  max-width: 980px;
  margin: 0 auto;
  padding: 80px 24px;
}
.section-title {
  font-size: clamp(28px, 5vw, 40px);
  font-weight: 700;
  letter-spacing: -1px;
  text-align: center;
  margin-bottom: 12px;
}
.section-sub {
  font-size: 16px;
  color: var(--text2);
  text-align: center;
  margin-bottom: 56px;
}
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}
.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  padding: 36px 28px;
  transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  backdrop-filter: blur(10px);
}
.card:hover {
  background: rgba(0,0,0,0.05);
  border-color: rgba(0,0,0,0.1);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.08);
}
.card-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 22px;
  background: rgba(59,130,246,0.1);
}
.card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
  letter-spacing: -0.3px;
}
.card p { font-size: 14px; color: var(--text2); line-height: 1.6; }

.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

footer {
  position: relative;
  z-index: 1;
  padding: 40px 24px;
  text-align: center;
  color: var(--text2);
  font-size: 12px;
  border-top: 1px solid var(--card-border);
}
footer a { color: var(--text2); text-decoration: none; transition: color 0.2s; }
footer a:hover { color: var(--text); }

.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: rgba(255,255,255,0.94);
  backdrop-filter: blur(20px);
  border: 1px solid var(--card-border);
  color: var(--text);
  padding: 10px 24px;
  border-radius: 12px;
  font-size: 14px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.10);
  opacity: 0;
  transition: all 0.3s ease;
  pointer-events: none;
  z-index: 300;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

@media (max-width: 640px) {
  .theme-toggle-mobile { display: inline-flex; }
  .nav-links .theme-toggle-btn { display: none; }
  #guestBtns, #userBtns {
    flex-direction: column;
    width: 100%;
    gap: 8px;
    margin-top: 16px;
  }
  #guestBtns { display: flex; }
  .nav-links .btn-nav { width: 100%; text-align: center; padding: 10px; font-size: 14px; }
  .user-info { flex-direction: column; align-items: flex-start; gap: 10px; width: 100%; }
  .hero h1 { letter-spacing: -1px; }
  .hero-actions { flex-direction: column; align-items: center; }
  .btn-hero { width: 200px; text-align: center; }
  .cards { grid-template-columns: 1fr; }
  .section { padding: 60px 20px; }
  footer { padding: 24px 16px; font-size: 11px; }
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .glow-orb { opacity: 0.35; }
  :root:not([data-theme="light"]) .btn-hero-primary:hover { background: #60a5fa; }
  :root:not([data-theme="light"]) .btn-hero-secondary:hover { background: rgba(255,255,255,0.12); }
  :root:not([data-theme="light"]) .card:hover { background: rgba(255,255,255,0.07); border-color: rgba(255,255,255,0.12); box-shadow: 0 20px 60px rgba(0,0,0,0.3); }
  :root:not([data-theme="light"]) .toast { color: var(--bg); }
}