/* Bitcoin Escrow — shared static pages. Mobile-first, WCAG-friendly, dark theme */
:root {
  --crypto-bg: #0d1b2a;
  --crypto-card: #1b263b;
  --crypto-border: #415a77;
  --crypto-accent: #00d4aa;
  --crypto-gold: #f7931a;
  --crypto-text: #e0e1dd;
  --crypto-muted: #778da9;
  --font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'Consolas', 'Monaco', monospace;
  --radius: 8px;
  --shadow: 0 4px 24px rgba(0,0,0,0.35);
}

* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; font-family: var(--font-sans); background: var(--crypto-bg); color: var(--crypto-text); line-height: 1.6; }
a { color: var(--crypto-accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; }

/* Nav */
.site-nav { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem; padding: 1rem 1.5rem; background: var(--crypto-card); border-bottom: 1px solid var(--crypto-border); }
.site-nav a { color: var(--crypto-text); }
.site-nav .logo { margin-right: auto; font-weight: 700; color: var(--crypto-accent); }
@media (max-width: 768px) { .site-nav { flex-direction: column; align-items: flex-start; } .site-nav .logo { margin-right: 0; } }

/* Main */
main { max-width: 900px; margin: 0 auto; padding: 1.5rem; min-height: 60vh; }

/* Cards */
.card { background: var(--crypto-card); border: 1px solid var(--crypto-border); border-radius: var(--radius); padding: 1.5rem; margin-bottom: 1.5rem; box-shadow: var(--shadow); }
.card h2 { margin: 0 0 1rem; color: var(--crypto-accent); font-size: 1.25rem; }

/* Forms */
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; margin-bottom: 0.35rem; font-weight: 500; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 0.75rem 1rem; font-size: 1rem; background: var(--crypto-bg); border: 1px solid var(--crypto-border);
  border-radius: var(--radius); color: var(--crypto-text); font-family: inherit;
}
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--crypto-accent); }
.btn { display: inline-block; padding: 0.75rem 1.5rem; font-size: 1rem; font-weight: 600; border: none; border-radius: var(--radius); cursor: pointer; transition: opacity 0.2s; }
.btn:hover { opacity: 0.9; }
.btn-primary { background: var(--crypto-accent); color: var(--crypto-bg); }
.btn-secondary { background: var(--crypto-border); color: var(--crypto-text); }

/* Alerts */
.alert { padding: 1rem; border-radius: var(--radius); margin-bottom: 1rem; }
.alert-error { background: rgba(200,80,80,0.15); border: 1px solid rgba(200,80,80,0.4); color: #f0a0a0; }
.alert-success { background: rgba(0,212,170,0.12); border: 1px solid var(--crypto-accent); color: var(--crypto-accent); }

/* Modal */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.7); display: flex; align-items: center; justify-content: center; z-index: 9999; padding: 1rem; }
.modal { background: var(--crypto-card); border: 1px solid var(--crypto-border); border-radius: var(--radius); padding: 1.5rem; max-width: 420px; width: 100%; }
.modal h3 { margin: 0 0 1rem; color: var(--crypto-accent); }
.modal .close { float: right; background: none; border: none; color: var(--crypto-muted); cursor: pointer; font-size: 1.25rem; }

/* Footer */
.site-footer { margin-top: 3rem; padding: 2rem 1.5rem; background: var(--crypto-card); border-top: 1px solid var(--crypto-border); text-align: center; color: var(--crypto-muted); font-size: 0.9rem; }
.site-footer a { color: var(--crypto-muted); }
.site-footer a:hover { color: var(--crypto-accent); }

/* KYC / webcam */
.kyc-preview { margin-top: 0.5rem; border: 1px solid var(--crypto-border); border-radius: var(--radius); max-width: 320px; }
#qr-container canvas, #qr-container img { display: block; margin: 0.5rem 0; }

/* KYC verification flow */
.kyc-verification { background: var(--crypto-bg); border: 1px solid var(--crypto-border); border-radius: var(--radius); padding: 20px; text-align: center; margin-top: 1rem; }
.kyc-video-wrap { position: relative; display: inline-block; border-radius: var(--radius); overflow: hidden; background: #000; margin-bottom: 16px; }
.kyc-video-wrap video { display: block; width: 320px; max-width: 100%; height: auto; border-radius: var(--radius); transform: scaleX(-1); }
.kyc-face-guide { position: absolute; top: 50%; left: 50%; width: 140px; height: 180px; transform: translate(-50%, -50%); border: 2px dashed rgba(0,212,170,0.6); border-radius: 50%; pointer-events: none; animation: kyc-guide-pulse 2s ease-in-out infinite; }
@keyframes kyc-guide-pulse { 0%,100%{border-color:rgba(0,212,170,0.6)} 50%{border-color:rgba(0,212,170,0.2)} }
.kyc-prompt { font-size: 1rem; font-weight: 600; padding: 10px 16px; border-radius: var(--radius); margin-bottom: 12px; transition: all 0.3s ease; }
.kyc-prompt--info { color: var(--crypto-accent); background: rgba(0,212,170,0.08); }
.kyc-prompt--error { color: #e63946; background: rgba(230,57,70,0.1); }
.kyc-prompt--success { color: #2ecc71; background: rgba(46,204,113,0.1); }
.kyc-progress-bar { width: 100%; height: 6px; background: var(--crypto-card); border-radius: 3px; overflow: hidden; margin-bottom: 6px; }
.kyc-progress-fill { height: 100%; background: var(--crypto-accent); border-radius: 3px; transition: width 0.4s ease; }
.kyc-progress-label { font-size: 0.8rem; color: var(--crypto-muted); }

/* Dark mode toggle */
.dark-toggle { background: none; border: 1px solid var(--crypto-border); color: var(--crypto-text); padding: 0.35rem 0.75rem; border-radius: var(--radius); cursor: pointer; }
body.light-mode { --crypto-bg: #e8eef2; --crypto-card: #fff; --crypto-text: #1b263b; --crypto-muted: #415a77; --crypto-border: #778da9; }

/* 404 / error */
.page-404, .error-page { text-align: center; padding: 3rem 1rem; }
.page-404 h1, .error-page h1 { font-size: 4rem; color: var(--crypto-muted); margin: 0; }
.error-page .btn { margin-top: 1rem; }

/* About / Terms */
.about-page section, .terms-page section { margin-bottom: 2rem; }
.about-page h2, .terms-page h2 { color: var(--crypto-accent); margin: 0 0 0.75rem; font-size: 1.25rem; }
.terms-updated { margin-top: 2rem; font-size: 0.9rem; color: var(--crypto-muted); }

/* KYC compliance banner */
.kyc-banner { margin-top: 1.5rem; padding: 1.25rem 1.5rem; background: rgba(247,147,26,0.1); border: 1px solid var(--crypto-gold); border-radius: var(--radius); color: var(--crypto-text); font-size: 0.9rem; line-height: 1.6; }
.kyc-banner p { margin: 0; }