:root {
    --bg-color: #f8fafc;
    --surface: #ffffff;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --danger: #ef4444;
    --success: #10b981;
}

body {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
}

#login-container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.login-box {
    background: var(--surface);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--border);
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
    justify-content: center;
}

.brand i {
    font-size: 28px;
    color: var(--primary);
}

.brand h1 {
    margin: 0;
    font-size: 24px;
    font-weight: 700;
}

p {
    text-align: center;
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 24px;
}

.input-group {
    margin-bottom: 16px;
}

.input-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 14px;
    font-weight: 500;
}

.input-group input {
    width: 100%;
    padding: 10px 12px;
    border-radius: 8px;
    border: 1px solid var(--border);
    font-size: 16px;
    box-sizing: border-box;
}

.input-group input:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.btn {
    width: 100%;
    padding: 12px;
    border-radius: 8px;
    border: none;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-hover);
}

#login-error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
    padding: 10px;
    border-radius: 8px;
    margin-bottom: 16px;
    font-size: 14px;
    text-align: center;
}

.hidden {
    display: none;
}