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

[data-theme="dark"] {
    --bg: #0f1419;
    --bg-2: #161b22;
    --bg-3: #1f2630;
    --border: #2a3340;
    --text: #e6edf3;
    --text-dim: #8b949e;
    --accent: #2f81f7;
    --accent-hover: #4493f8;
    --danger: #f85149;
    --success: #3fb950;
}
[data-theme="light"] {
    --bg: #f5f7fa;
    --bg-2: #ffffff;
    --bg-3: #eef2f7;
    --border: #d4dae3;
    --text: #1a2332;
    --text-dim: #5e6878;
    --accent: #1f6feb;
    --accent-hover: #2f81f7;
    --danger: #d1242f;
    --success: #1a7f37;
}

html, body {
    height: 100%;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.auth-card {
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 32px;
    width: 100%;
    max-width: 420px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.15);
}

.auth-card h1 {
    font-size: 22px;
    margin-bottom: 6px;
    text-align: center;
}

.auth-card p {
    color: var(--text-dim);
    margin-bottom: 18px;
    text-align: center;
    font-size: 13px;
}

.auth-card p.ok-msg {
    color: var(--success);
    background: rgba(63,185,80,0.1);
    padding: 8px;
    border-radius: 6px;
}

label {
    display: block;
    margin-bottom: 14px;
}

label > span {
    display: block;
    font-size: 12px;
    color: var(--text-dim);
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

input[type="text"], input[type="password"] {
    width: 100%;
    padding: 10px 12px;
    background: var(--bg-3);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text);
    font-size: 14px;
    outline: none;
    font-family: inherit;
}
input:focus { border-color: var(--accent); }

.btn-primary {
    width: 100%;
    padding: 10px;
    background: var(--accent);
    border: none;
    border-radius: 6px;
    color: white;
    font-size: 14px;
    cursor: pointer;
    font-weight: 600;
}
.btn-primary:hover { background: var(--accent-hover); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-link {
    background: transparent;
    border: none;
    color: var(--text-dim);
    cursor: pointer;
    margin-top: 8px;
    width: 100%;
    padding: 6px;
    font-size: 13px;
}
.btn-link:hover { color: var(--accent); }

.error {
    margin-top: 10px;
    color: var(--danger);
    font-size: 13px;
    text-align: center;
    min-height: 18px;
}

.muted { color: var(--text-dim); }

.strength {
    font-size: 12px;
    margin: -8px 0 12px;
    min-height: 16px;
}