* { box-sizing: border-box; margin: 0; padding: 0; }
:root { --primary: #4f46e5; --accent: #06b6d4; --bg: #0f172a; --bg-card: #1e293b; --text: #e2e8f0; --text-dim: #94a3b8; --border: #334155; }
body { font-family: 'Segoe UI', system-ui, sans-serif; background: var(--bg); color: var(--text); line-height: 1.6; }
header { padding: 20px 40px; border-bottom: 1px solid var(--border); }
.logo { font-size: 24px; font-weight: 800; background: linear-gradient(135deg, var(--primary), var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
main { max-width: 800px; margin: 0 auto; padding: 40px 20px; }
.hero { text-align: center; padding: 40px 0; }
.hero h1 { font-size: 36px; margin-bottom: 12px; }
.hero p { color: var(--text-dim); font-size: 18px; }
.exchange-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 20px; padding: 32px; margin: 32px 0; }
form label { display: block; margin-bottom: 18px; font-size: 14px; color: var(--text-dim); }
form input, form select { display: block; width: 100%; padding: 14px 16px; margin-top: 6px; background: var(--bg); border: 1px solid var(--border); border-radius: 10px; color: var(--text); font-size: 16px; }
.submit-btn { width: 100%; padding: 16px; background: linear-gradient(135deg, var(--primary), var(--accent)); border: none; border-radius: 12px; color: #fff; font-size: 16px; font-weight: 700; cursor: pointer; }
.rate-row { display: grid; grid-template-columns: 1fr 1fr 1fr 1fr; padding: 12px 16px; background: var(--bg-card); border-radius: 10px; margin-bottom: 8px; font-size: 14px; }
.rate-row.header { background: transparent; font-weight: 700; color: var(--text-dim); border: none; font-size: 12px; }