:root {
  --bitcoin: #F7931A;
  --bitcoin-dark: #d4780f;
  --bg: #0F0F1A;
  --bg2: #1A1A2E;
  --bg3: #16213E;
  --text: #ECEFF1;
  --text-muted: #90A4AE;
  --success: #27AE60;
  --error: #E74C3C;
  --border: #2a2a45;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { background: var(--bg); color: var(--text); font-family: 'Segoe UI', sans-serif; min-height: 100vh; }
a { color: var(--bitcoin); text-decoration: none; }
a:hover { color: var(--bitcoin-dark); }

/* NAVBAR */
nav { background: var(--bg2); border-bottom: 1px solid var(--border); padding: 0 2rem; display: flex; align-items: center; justify-content: space-between; height: 60px; position: sticky; top: 0; z-index: 100; }
.nav-brand { font-size: 1.3rem; font-weight: 700; color: var(--bitcoin); display: flex; align-items: center; gap: 0.5rem; }
.nav-links { display: flex; gap: 1.5rem; align-items: center; }
.nav-links a { color: var(--text-muted); font-size: 0.9rem; transition: color 0.2s; }
.nav-links a:hover, .nav-links a.active { color: var(--bitcoin); }

/* AD BANNER TOP */
.ad-top { background: var(--bg2); border-bottom: 1px solid var(--border); display: flex; justify-content: center; padding: 8px; min-height: 58px; }

/* HERO */
.hero { text-align: center; padding: 4rem 1rem 3rem; }
.hero h1 { font-size: 2.5rem; font-weight: 800; margin-bottom: 1rem; }
.hero h1 span { color: var(--bitcoin); }
.hero p { color: var(--text-muted); font-size: 1.1rem; max-width: 500px; margin: 0 auto 2rem; }
.hero .stats { display: flex; justify-content: center; gap: 3rem; margin-bottom: 2rem; }
.stat-item { text-align: center; }
.stat-value { font-size: 1.8rem; font-weight: 700; color: var(--bitcoin); }
.stat-label { font-size: 0.8rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; }

/* BUTTONS */
.btn { display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.75rem 2rem; border-radius: 8px; border: none; cursor: pointer; font-size: 1rem; font-weight: 600; transition: all 0.2s; }
.btn-primary { background: var(--bitcoin); color: #000; }
.btn-primary:hover { background: var(--bitcoin-dark); transform: translateY(-1px); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
.btn-outline { background: transparent; color: var(--bitcoin); border: 2px solid var(--bitcoin); }
.btn-outline:hover { background: var(--bitcoin); color: #000; }
.btn-sm { padding: 0.4rem 1rem; font-size: 0.85rem; }

/* CARDS */
.card { background: var(--bg2); border: 1px solid var(--border); border-radius: 12px; padding: 1.5rem; }
.card-title { font-size: 1rem; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 1rem; }

/* LAYOUT */
.container { max-width: 1100px; margin: 0 auto; padding: 0 1rem; }
.main-grid { display: grid; grid-template-columns: 1fr 300px; gap: 2rem; padding: 2rem 0; }
@media (max-width: 768px) { .main-grid { grid-template-columns: 1fr; } .hero h1 { font-size: 1.8rem; } .hero .stats { gap: 1.5rem; } }

/* CLAIM BOX */
.claim-box { text-align: center; padding: 2rem; }
.claim-amount { font-size: 3rem; font-weight: 800; color: var(--bitcoin); margin: 1rem 0; }
.claim-amount span { font-size: 1.2rem; color: var(--text-muted); }
.timer { font-size: 1.5rem; font-weight: 700; color: var(--error); margin: 1rem 0; font-variant-numeric: tabular-nums; }
.input-group { display: flex; flex-direction: column; gap: 0.5rem; margin: 1rem 0; text-align: left; }
.input-group label { font-size: 0.85rem; color: var(--text-muted); }
.input-group input { background: var(--bg3); border: 1px solid var(--border); border-radius: 8px; padding: 0.75rem 1rem; color: var(--text); font-size: 0.95rem; width: 100%; }
.input-group input:focus { outline: none; border-color: var(--bitcoin); }

/* ALERTS */
.alert { padding: 0.75rem 1rem; border-radius: 8px; font-size: 0.9rem; margin: 0.5rem 0; }
.alert-success { background: rgba(39,174,96,0.15); border: 1px solid var(--success); color: var(--success); }
.alert-error { background: rgba(231,76,60,0.15); border: 1px solid var(--error); color: var(--error); }

/* TABLE */
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th { text-align: left; padding: 0.5rem 0.75rem; color: var(--text-muted); font-weight: 600; border-bottom: 1px solid var(--border); }
td { padding: 0.6rem 0.75rem; border-bottom: 1px solid var(--border); }
.badge { display: inline-block; padding: 2px 8px; border-radius: 4px; font-size: 0.75rem; font-weight: 600; }
.badge-paid { background: rgba(39,174,96,0.2); color: var(--success); }
.badge-pending { background: rgba(247,147,26,0.2); color: var(--bitcoin); }
.badge-failed { background: rgba(231,76,60,0.2); color: var(--error); }

/* FORM */
.form-page { max-width: 420px; margin: 4rem auto; padding: 0 1rem; }
.form-tabs { display: flex; border-bottom: 1px solid var(--border); margin-bottom: 1.5rem; }
.tab { flex: 1; text-align: center; padding: 0.75rem; cursor: pointer; color: var(--text-muted); font-weight: 600; border-bottom: 2px solid transparent; transition: all 0.2s; }
.tab.active { color: var(--bitcoin); border-bottom-color: var(--bitcoin); }
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; font-size: 0.85rem; color: var(--text-muted); margin-bottom: 0.4rem; }
.form-group input { width: 100%; background: var(--bg3); border: 1px solid var(--border); border-radius: 8px; padding: 0.75rem 1rem; color: var(--text); font-size: 0.95rem; }
.form-group input:focus { outline: none; border-color: var(--bitcoin); }

/* FOOTER */
footer { background: var(--bg2); border-top: 1px solid var(--border); padding: 2rem; text-align: center; color: var(--text-muted); font-size: 0.85rem; margin-top: 4rem; }
footer .footer-links { display: flex; justify-content: center; gap: 1.5rem; margin-bottom: 1rem; }

/* AD SIDEBAR */
.ad-sidebar { display: flex; flex-direction: column; gap: 1rem; }

/* SPINNER */
.spinner { display: inline-block; width: 18px; height: 18px; border: 2px solid rgba(0,0,0,0.3); border-top-color: #000; border-radius: 50%; animation: spin 0.7s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }