:root {
    --bg: #0f1419;
    --surface: #1a2332;
    --surface2: #243044;
    --border: #2d3a4f;
    --text: #e8eef7;
    --muted: #94a3b8;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --success: #22c55e;
    --danger: #ef4444;
    --radius: 12px;
    --shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
    font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: linear-gradient(160deg, #0b1020 0%, #121a2e 45%, #0f1419 100%);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.5;
}

a { color: #93c5fd; text-decoration: none; }
a:hover { text-decoration: underline; }

.shell { max-width: 1180px; margin: 0 auto; padding: 28px 20px 48px; }

.topbar {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 28px; padding-bottom: 16px; border-bottom: 1px solid var(--border);
}
.brand { font-size: 20px; font-weight: 700; letter-spacing: 0.02em; }
.brand span { color: var(--muted); font-weight: 500; font-size: 13px; display: block; margin-top: 4px; }
.nav { display: flex; gap: 10px; flex-wrap: wrap; }

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: var(--shadow);
    margin-bottom: 18px;
}
.card h2, .card h3 { margin: 0 0 12px; font-size: 18px; }
.card p.desc { color: var(--muted); margin: 0 0 16px; font-size: 14px; }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }

.btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 10px 16px; border-radius: 10px; border: none; cursor: pointer;
    font-size: 14px; font-weight: 600; text-decoration: none;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); color: #fff; text-decoration: none; }
.btn-ghost { background: var(--surface2); color: var(--text); border: 1px solid var(--border); }
.btn-ghost:hover { background: #2a3850; text-decoration: none; }
.btn-danger { background: rgba(239, 68, 68, 0.15); color: #fca5a5; border: 1px solid rgba(239, 68, 68, 0.35); }

input, select, textarea {
    width: 100%; padding: 10px 12px; border-radius: 10px;
    border: 1px solid var(--border); background: #0f172a; color: var(--text);
    font-size: 14px;
}
label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.field { margin-bottom: 14px; }

table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { padding: 10px 12px; border-bottom: 1px solid var(--border); text-align: left; }
th { color: var(--muted); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: 0.04em; }

.alert { padding: 12px 14px; border-radius: 10px; margin-bottom: 14px; font-size: 14px; }
.alert-ok { background: rgba(34, 197, 94, 0.12); border: 1px solid rgba(34, 197, 94, 0.35); color: #86efac; }
.alert-err { background: rgba(239, 68, 68, 0.12); border: 1px solid rgba(239, 68, 68, 0.35); color: #fca5a5; }

.login-wrap { max-width: 420px; margin: 80px auto; }
.tabs { display: flex; gap: 8px; margin-bottom: 18px; }
.tab { flex: 1; text-align: center; padding: 10px; border-radius: 10px; background: var(--surface2); color: var(--muted); }
.tab.active { background: var(--primary); color: #fff; }

.price-tag { font-size: 22px; font-weight: 700; color: #fde68a; }
.muted { color: var(--muted); font-size: 13px; }

.package-card {
    border: 1px solid var(--border); border-radius: var(--radius);
    padding: 18px; background: var(--surface2);
}
.package-card:hover { border-color: var(--primary); }

a.card-link {
    display: block;
    text-decoration: none;
    color: inherit;
    transition: border-color 0.15s ease, transform 0.15s ease;
}
a.card-link:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    text-decoration: none;
}
a.card-link h3, a.card-link p { color: inherit; }

.btn.nav-active { border-color: var(--primary); color: #93c5fd; }
.amount-plus { color: #86efac; }
.amount-minus { color: #fca5a5; }