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

:root {
    --bg: #f8f9fa;
    --surface: #ffffff;
    --border: #e2e8f0;
    --text: #1a202c;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --primary: #4f6d7a;
    --primary-light: #e8eff3;
    --danger: #ef4444;
    --danger-bg: #fef2f2;
    --success: #10b981;
    --success-bg: #ecfdf5;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 24px;
}

.login-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 32px;
    box-shadow: var(--shadow-md);
}

.login-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: -0.5px;
    text-align: center;
    margin-bottom: 8px;
}

.login-card h1 {
    font-size: 1.125rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 4px;
}

.login-subtitle {
    font-size: 0.8125rem;
    color: var(--text-muted);
    text-align: center;
    margin-bottom: 24px;
}

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

.form-group label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 500;
    margin-bottom: 4px;
    color: var(--text-secondary);
}

.form-group input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.875rem;
    color: var(--text);
    background: var(--surface);
    transition: border-color 0.15s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 109, 122, 0.15);
}

.btn-login {
    width: 100%;
    padding: 10px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.15s;
    margin-top: 8px;
}

.btn-login:hover { opacity: 0.9; }
.btn-login:disabled { opacity: 0.6; cursor: not-allowed; }

.alert {
    padding: 10px 14px;
    border-radius: var(--radius);
    font-size: 0.8125rem;
    margin-bottom: 16px;
}

.alert-error {
    background: var(--danger-bg);
    color: var(--danger);
    border: 1px solid #fecaca;
}

.alert-success {
    background: var(--success-bg);
    color: #047857;
    border: 1px solid #a7f3d0;
}

.alert-success a {
    color: #047857;
    font-weight: 600;
}