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

:root {
    --primary: #2c3e50;
    --primary-light: #34495e;
    --accent: #3498db;
    --accent-hover: #2980b9;
    --bg: #ecf0f1;
    --card-bg: #ffffff;
    --text: #2c3e50;
    --text-light: #7f8c8d;
    --border: #dce1e3;
    --error: #e74c3c;
    --shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
    --radius: 12px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.login-container {
    width: 100%;
    max-width: 420px;
}

.login-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 2.5rem 2rem;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.login-header h1 {
    font-size: 2.2rem;
    color: var(--primary);
    margin-bottom: 0.3rem;
}

.login-header p {
    color: var(--text-light);
    font-size: 0.95rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.4rem;
    font-size: 0.9rem;
    color: var(--text);
}

.form-group input {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.2s ease;
    outline: none;
}

.form-group input:focus {
    border-color: var(--accent);
}

.password-wrapper {
    position: relative;
}

.password-wrapper input {
    padding-right: 3rem;
}

.toggle-password {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.1rem;
    opacity: 0.6;
}

.toggle-password:hover {
    opacity: 1;
}

.error-msg {
    background: #fdecea;
    color: var(--error);
    padding: 0.75rem;
    border-radius: 8px;
    font-size: 0.85rem;
    text-align: center;
    margin-bottom: 1rem;
}

.btn-login {
    display: block;
    width: 100%;
    padding: 0.9rem;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s ease, transform 0.1s ease;
}

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

.btn-login:active {
    transform: scale(0.98);
}

.btn-login:disabled {
    background: #bdc3c7;
    cursor: not-allowed;
}

.hidden {
    display: none !important;
}

@media (max-width: 480px) {
    .login-card {
        padding: 2rem 1.5rem;
    }

    .login-header h1 {
        font-size: 1.8rem;
    }
}