:root {
  --bg: #0d1117;
  --bg-card: #161b22;
  --bg-input: #0d1117;
  --border: #30363d;
  --text: #e6edf3;
  --text-dim: #8b949e;
  --accent: #58a6ff;
  --accent-dim: #1f6feb;
  --green: #3fb950;
  --red: #f85149;
  --orange: #d29922;
  --radius: 12px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 17, 23, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo { font-size: 1.3rem; font-weight: 700; color: var(--text); }
.nav-links { display: flex; gap: 20px; align-items: center; }
.nav-links a { color: var(--text-dim); }
.nav-links a:hover { color: var(--text); text-decoration: none; }

/* Buttons */
.btn {
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.15s;
}
.btn:hover { border-color: var(--accent); }
.btn-primary {
  background: var(--accent-dim);
  border-color: var(--accent-dim);
  color: #fff;
}
.btn-primary:hover { background: var(--accent); border-color: var(--accent); }
.btn-ghost { border: 1px solid var(--border); }
.btn-danger { border-color: var(--red); color: var(--red); }
.btn-danger:hover { background: rgba(248,81,73,0.1); }
.btn-sm { padding: 6px 12px; font-size: 0.85rem; }
.btn-full { width: 100%; margin-top: 12px; }

/* Hero */
.hero {
  text-align: center;
  padding: 80px 24px 60px;
  max-width: 800px;
  margin: 0 auto;
}
.hero h1 { font-size: 2.8rem; font-weight: 800; line-height: 1.2; }
.hero h1 span { color: var(--accent); }
.hero .sub { font-size: 1.2rem; color: var(--text-dim); margin-top: 16px; }
.hero-badges { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 28px; }
.badge {
  padding: 6px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* Pricing */
.pricing { padding: 60px 24px; max-width: 1100px; margin: 0 auto; }
.pricing h2 { text-align: center; font-size: 2rem; margin-bottom: 8px; }
.section-sub { text-align: center; color: var(--text-dim); margin-bottom: 40px; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  display: flex;
  flex-direction: column;
  transition: transform 0.15s, border-color 0.15s;
}
.card:hover { transform: translateY(-4px); border-color: var(--accent); }
.card-featured { border-color: var(--accent-dim); position: relative; }
.card-featured::before {
  content: 'Most Popular';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-dim);
  color: #fff;
  padding: 4px 16px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
}
.card-header h3 { font-size: 1.3rem; margin-bottom: 8px; }
.price .amount { font-size: 2.5rem; font-weight: 800; }
.price .per { color: var(--text-dim); font-size: 1.1rem; }
.token-budget {
  font-size: 1.1rem;
  color: var(--accent);
  font-weight: 600;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 16px;
}
.features { list-style: none; }
.features li { padding: 6px 0; color: var(--text-dim); font-size: 0.95rem; }
.btn-subscribe { margin-top: 20px; }

/* How It Works */
.how-it-works { padding: 60px 24px; max-width: 1000px; margin: 0 auto; }
.how-it-works h2 { text-align: center; font-size: 2rem; margin-bottom: 40px; }
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 32px; }
.step { text-align: center; }
.step-num {
  width: 40px;
  height: 40px;
  background: var(--accent-dim);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  margin: 0 auto 12px;
}
.step h3 { margin-bottom: 8px; }
.step p { color: var(--text-dim); font-size: 0.9rem; }

/* Code */
.code-example { padding: 40px 24px; max-width: 800px; margin: 0 auto 60px; }
.code-example h2 { text-align: center; margin-bottom: 24px; }
.code-block {
  background: #010409;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  overflow-x: auto;
}
.code-block pre code { color: var(--text); font-family: 'SF Mono', Menlo, monospace; font-size: 0.9rem; }
code { background: rgba(110,118,129,0.1); padding: 2px 6px; border-radius: 4px; font-family: 'SF Mono', Menlo, monospace; font-size: 0.9em; }

/* Footer */
footer {
  text-align: center;
  padding: 40px 24px;
  border-top: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 0.9rem;
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  display: flex !important;
  align-items: center;
  justify-content: center;
  z-index: 200;
}
.modal-content {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  width: 100%;
  max-width: 400px;
  position: relative;
}
.modal-close {
  position: absolute;
  top: 12px;
  right: 16px;
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 1.5rem;
  cursor: pointer;
}
.modal-content h2 { margin-bottom: 20px; }
.modal-content input {
  width: 100%;
  padding: 12px;
  margin-bottom: 12px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 0.95rem;
}
.modal-content input:focus { border-color: var(--accent); outline: none; }
.auth-toggle { text-align: center; margin-top: 12px; color: var(--text-dim); }

/* Dashboard */
.dashboard { max-width: 1000px; margin: 0 auto; padding: 40px 24px; }
.dashboard h1 { margin-bottom: 32px; }
.dash-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.dash-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.dash-card-wide { grid-column: 1 / -1; }
.dash-card h3 { margin-bottom: 16px; color: var(--text-dim); font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.5px; }

.tier-badge {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 20px;
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 8px;
}
.tier-badge.free { background: rgba(139,148,158,0.2); color: var(--text-dim); }
.tier-badge.starter { background: rgba(63,185,80,0.2); color: var(--green); }
.tier-badge.pro { background: rgba(88,166,255,0.2); color: var(--accent); }
.tier-badge.max { background: rgba(210,153,34,0.2); color: var(--orange); }
.tier-status { color: var(--text-dim); font-size: 0.9rem; margin-bottom: 12px; }

.usage-bar-container {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  height: 24px;
  overflow: hidden;
  margin-bottom: 12px;
}
.usage-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--green), var(--accent));
  transition: width 0.3s;
  border-radius: 8px;
}
.usage-bar.over-80 { background: linear-gradient(90deg, var(--orange), var(--red)); }
.usage-text { font-size: 0.9rem; color: var(--text-dim); }
.usage-remaining { font-size: 0.85rem; color: var(--text-dim); margin-top: 4px; }

.api-key-row { display: flex; gap: 8px; align-items: center; }
.api-key-input {
  flex: 1;
  padding: 10px 12px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-family: 'SF Mono', Menlo, monospace;
  font-size: 0.9rem;
}
.api-key-hint { margin-top: 8px; font-size: 0.85rem; color: var(--text-dim); }

.models-table { width: 100%; border-collapse: collapse; }
.models-table th, .models-table td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}
.models-table th { color: var(--text-dim); font-weight: 500; }

.center-msg { text-align: center; padding: 100px 24px; }
.center-msg h2 { margin-bottom: 12px; }
.center-msg p { color: var(--text-dim); margin-bottom: 24px; }

/* Responsive */
@media (max-width: 700px) {
  .dash-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 2rem; }
  .cards { grid-template-columns: 1fr; }
  .nav-links { gap: 10px; }
}