/* ===== Support button ===== */
.support-btn {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 1000;
  background: var(--accent);
  color: #fff;
  padding: 12px 20px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 4px 20px rgba(129,140,248,0.3);
  transition: all var(--transition);
}
.support-btn:hover {
  background: var(--accent-hover);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(129,140,248,0.4);
  text-decoration: none;
}

/* ===== Fonts ===== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* ===== Variables ===== */
:root {
  --bg: #09090b;
  --bg-subtle: #0f0f13;
  --surface: rgba(255,255,255,0.03);
  --surface-hover: rgba(255,255,255,0.06);
  --glass: rgba(255,255,255,0.05);
  --glass-border: rgba(255,255,255,0.08);
  --border: rgba(255,255,255,0.06);
  --border-hover: rgba(255,255,255,0.12);
  --text: #fafafa;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  --accent: #818cf8;
  --accent-hover: #a5b4fc;
  --accent-glow: rgba(129,140,248,0.15);
  --green: #34d399;
  --yellow: #fbbf24;
  --red: #f87171;
  --code-bg: rgba(0,0,0,0.4);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono: 'JetBrains Mono', 'Fira Code', monospace;
  --transition: 150ms cubic-bezier(.4,0,.2,1);
  --max-w: 1100px;
}

/* ===== Reset ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-hover); }
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }

/* ===== Gradient mesh background ===== */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, var(--accent-glow), transparent),
    radial-gradient(ellipse 60% 40% at 80% 0%, rgba(99,102,241,0.08), transparent),
    radial-gradient(ellipse 50% 30% at 20% 10%, rgba(139,92,246,0.06), transparent);
  pointer-events: none;
  z-index: 0;
}
body > * { position: relative; z-index: 1; }

/* ===== Header ===== */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(9,9,11,0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}
.logo {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}
.logo span { color: var(--accent); }
.header-right { display: flex; align-items: center; gap: 16px; }
.lang-toggle {
  display: flex;
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.lang-toggle button {
  background: none;
  border: none;
  color: var(--text-muted);
  padding: 6px 14px;
  cursor: pointer;
  font-size: 0.8rem;
  font-family: var(--font);
  font-weight: 500;
  transition: all var(--transition);
}
.lang-toggle button.active {
  background: var(--accent);
  color: #fff;
}

/* ===== Hero ===== */
.hero {
  text-align: center;
  padding: 80px 0 48px;
}
.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 12px;
  background: linear-gradient(135deg, var(--text) 0%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero .subtitle {
  color: var(--text-secondary);
  font-size: 1.15rem;
  max-width: 520px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ===== Key / Balance section ===== */
.key-section {
  max-width: 560px;
  margin: 36px auto 0;
  display: flex;
  gap: 10px;
}
.key-section input {
  flex: 1;
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.85rem;
  transition: border-color var(--transition);
}
.key-section input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.key-section input::placeholder { color: var(--text-muted); }
.btn {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 12px 22px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.85rem;
  font-family: var(--font);
  white-space: nowrap;
  transition: all var(--transition);
}
.btn:hover {
  background: var(--accent-hover);
  box-shadow: 0 0 20px var(--accent-glow);
}

/* ===== Balance card (glass) ===== */
.balance-card {
  max-width: 560px;
  margin: 24px auto 0;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  overflow: hidden;
  transition: opacity 0.3s;
}
.balance-card.hidden { display: none; }
.balance-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}
.balance-card-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 1.05rem;
}
.balance-pkg-icon { font-size: 1.2rem; }
.balance-auto-wrap { display: flex; align-items: center; gap: 8px; }
.toggle-text { font-size: 0.78rem; color: var(--text-muted); }
.toggle-label {
  position: relative;
  display: inline-block;
  width: 36px;
  height: 20px;
  cursor: pointer;
}
.toggle-label input { opacity: 0; width: 0; height: 0; }
.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--border);
  border-radius: 20px;
  transition: background 0.2s;
}
.toggle-slider::before {
  content: '';
  position: absolute;
  width: 14px; height: 14px;
  left: 3px; top: 3px;
  background: var(--text-muted);
  border-radius: 50%;
  transition: transform 0.2s, background 0.2s;
}
.toggle-label input:checked + .toggle-slider { background: var(--accent); }
.toggle-label input:checked + .toggle-slider::before {
  transform: translateX(16px);
  background: #fff;
}
.balance-card-body { padding: 20px; }
.balance-stat { margin-bottom: 16px; }
.balance-stat-label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  font-weight: 500;
}
.balance-bar-wrap {
  background: rgba(0,0,0,0.3);
  border-radius: 6px;
  height: 8px;
  overflow: hidden;
  margin-bottom: 8px;
}
.balance-bar {
  height: 100%;
  border-radius: 6px;
  background: linear-gradient(90deg, var(--accent), var(--green));
  transition: width 0.6s ease;
  min-width: 2px;
}
.balance-bar.warn { background: linear-gradient(90deg, var(--yellow), #f59e0b); }
.balance-bar.danger { background: linear-gradient(90deg, var(--red), #ef4444); }
.balance-stat-value {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--text-secondary);
}
.balance-stats-row { display: flex; gap: 10px; }
.balance-mini-stat {
  flex: 1;
  background: rgba(0,0,0,0.2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px;
  text-align: center;
}
.balance-mini-label {
  display: block;
  font-size: 0.68rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
  font-weight: 500;
}
.balance-mini-value {
  font-family: var(--mono);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
}
.balance-card-footer {
  padding: 10px 20px;
  border-top: 1px solid var(--border);
  font-size: 0.72rem;
  color: var(--text-muted);
  text-align: right;
}
.balance-result {
  text-align: center;
  margin-top: 12px;
  font-family: var(--mono);
  font-size: 0.85rem;
  min-height: 24px;
}
.balance-result.error { color: var(--red); }

/* ===== Tools grid (glass cards) ===== */
.section-title {
  text-align: center;
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
  padding: 32px 0;
}
.tool-card {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 24px;
  display: block;
  color: var(--text);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.tool-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--accent-glow), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}
.tool-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
  color: var(--text);
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}
.tool-card:hover::before { opacity: 1; }
.tool-card h3 {
  position: relative;
  margin-bottom: 6px;
  font-weight: 600;
  font-size: 1rem;
}
.tool-card p {
  position: relative;
  color: var(--text-muted);
  font-size: 0.82rem;
  line-height: 1.5;
}

/* ===== FAQ ===== */
.faq { padding: 56px 0; }
.faq h2 { margin-bottom: 24px; text-align: center; }
.faq-item {
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  margin-bottom: 8px;
  overflow: hidden;
  background: var(--glass);
  backdrop-filter: blur(8px);
}
.faq-q {
  padding: 16px 20px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 500;
  transition: color var(--transition);
}
.faq-q:hover { color: var(--accent); }
.faq-q::after {
  content: '+';
  font-size: 1.2rem;
  color: var(--text-muted);
  transition: transform 0.2s;
}
.faq-item.open .faq-q::after { content: '−'; }
.faq-a {
  padding: 0 20px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s, padding 0.3s;
  color: var(--text-secondary);
  line-height: 1.7;
}
.faq-item.open .faq-a { padding: 0 20px 16px; max-height: 300px; }

/* ===== Pricing ===== */
.pricing-section { padding: 48px 0 64px; }
.pricing-section h2 {
  text-align: center;
  margin-bottom: 32px;
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.pricing-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  margin-bottom: 24px;
}
.pricing-card {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
  flex: 0 0 190px;
  min-width: 160px;
}
.pricing-card:hover {
  border-color: var(--accent);
  box-shadow: 0 0 24px var(--accent-glow);
  transform: translateY(-2px);
}
.pricing-name { font-weight: 700; font-size: 1.1rem; margin-bottom: 8px; }
.pricing-price {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 6px;
}
.pricing-tokens { font-size: 0.82rem; color: var(--text-secondary); margin-bottom: 4px; }
.pricing-days { font-size: 0.78rem; color: var(--text-muted); }
.pricing-desc { font-size: 0.78rem; color: var(--text-muted); margin-top: 8px; }
.pricing-note { text-align: center; color: var(--text-secondary); font-size: 0.88rem; }

/* ===== Footer ===== */
footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
  color: var(--text-muted);
  font-size: 0.85rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 32px;
}
.footer-col strong {
  display: block;
  color: var(--text);
  margin-bottom: 8px;
  font-size: 0.9rem;
}
.footer-col a, .footer-col span { display: block; margin-bottom: 4px; }

/* ===== Tool page ===== */
.tool-page { padding: 48px 0; }
.tool-page h1 { margin-bottom: 8px; font-size: 1.8rem; }
.back-link {
  display: inline-block;
  margin-bottom: 24px;
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 500;
}
.step {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 16px;
  backdrop-filter: blur(8px);
}
.step h3 { margin-bottom: 12px; color: var(--accent); font-size: 1rem; font-weight: 600; }
.step p { margin-bottom: 12px; color: var(--text-secondary); font-size: 0.9rem; }
.code-block {
  background: var(--code-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 16px;
  position: relative;
  overflow-x: auto;
}
.code-block pre {
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-all;
  color: var(--text-secondary);
}
.copy-btn {
  position: absolute;
  top: 8px; right: 8px;
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: 6px;
  color: var(--text-muted);
  padding: 4px 12px;
  cursor: pointer;
  font-size: 0.72rem;
  font-family: var(--font);
  transition: all var(--transition);
}
.copy-btn:hover { color: var(--text); border-color: var(--border-hover); }
.models-list {
  margin-top: 12px;
  padding-left: 20px;
}
.models-list li {
  color: var(--text-secondary);
  margin-bottom: 4px;
  font-family: var(--mono);
  font-size: 0.82rem;
}
.note {
  background: var(--accent-glow);
  border-left: 3px solid var(--accent);
  padding: 12px 16px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-top: 12px;
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.6;
}

/* ===== Oferta ===== */
.oferta-body {
  max-width: 800px;
  margin: 0 auto;
  padding: 48px 20px;
  font-size: 0.92rem;
  line-height: 1.8;
}
.oferta-body h1 {
  text-align: center;
  margin-bottom: 32px;
  font-size: 1.5rem;
  letter-spacing: -0.02em;
}
.oferta-body h2 {
  margin: 28px 0 12px;
  font-size: 1.05rem;
  color: var(--text);
}
.oferta-body p {
  margin-bottom: 12px;
  color: var(--text-secondary);
}

/* ===== Fade-in animation ===== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
  .hero { padding: 56px 0 32px; }
  .hero h1 { font-size: 1.8rem; }
  .key-section { flex-direction: column; }
  .tools-grid { grid-template-columns: 1fr; }
  .pricing-grid { justify-content: center; }
  .pricing-card { flex: 1 1 calc(50% - 8px); max-width: 200px; }
  .balance-stats-row { flex-wrap: wrap; }
  .footer-grid { grid-template-columns: 1fr; gap: 20px; }
}