:root {
    --bg-primary: #0f0f13;
    --bg-secondary: #1a1a24;
    --bg-card: #22222e;
    --bg-hover: #2a2a38;
    --text-primary: #e8e8ed;
    --text-secondary: #8e8e9b;
    --accent: #6366f1;
    --accent-hover: #818cf8;
    --success: #22c55e;
    --error: #ef4444;
    --border: #2e2e3a;
    --radius: 10px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    padding-bottom: 80px;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    height: 56px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-brand a {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.nav-links { display: flex; gap: 8px; }

.nav-link {
    padding: 8px 16px;
    border-radius: var(--radius);
    color: var(--text-secondary);
    font-size: 14px;
    transition: all 0.2s;
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}
.nav-link:hover { color: var(--text-primary); background: var(--bg-hover); }
.nav-link.active { color: var(--accent); background: var(--bg-card); }

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 24px 16px;
}

.btn {
    padding: 10px 24px;
    border: none;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-secondary { background: var(--bg-card); color: var(--text-primary); border: 1px solid var(--border); }
.btn-secondary:hover { border-color: var(--accent); }

.form-group { margin-bottom: 16px; }
.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 14px;
    color: var(--text-secondary);
}
.form-input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s;
}
.form-input:focus { border-color: var(--accent); }
.form-hint { color: var(--text-secondary); font-size: 12px; margin-top: 8px; }

.btn-row { display: flex; gap: 8px; }
.code-row { display: flex; gap: 8px; }

.badge {
    font-size: 10px;
    padding: 1px 6px;
    border-radius: 10px;
    background: var(--success);
    color: #fff;
}