:root {
    --primary: #d32f2f;
    --primary-dark: #b71c1c;
    --secondary: #ffa000;
    --dark: #212121;
    --light: #f5f5f5;
    --gray: #757575;
    --success: #4caf50;
    --error: #f44336;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-container {
    background: white;
    border-radius: 15px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.3);
    width: 100%;
    max-width: 400px;
    overflow: hidden;
}

.login-header {
    background: var(--primary);
    color: white;
    padding: 30px 20px;
    text-align: center;
}

.login-header h1 {
    font-size: 24px;
    margin-bottom: 10px;
}

.login-header p {
    opacity: 0.9;
    font-size: 14px;
}

.login-form {
    padding: 30px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--dark);
}

.input-with-icon {
    position: relative;
}

.input-with-icon i {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray);
}

.input-with-icon input {
    width: 100%;
    padding: 12px 15px 12px 45px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 16px;
    transition: all 0.3s;
}

.input-with-icon input:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(211, 47, 47, 0.1);
}

.btn {
    width: 100%;
    background: var(--primary);
    color: white;
    border: none;
    padding: 14px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s;
}

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

.btn:disabled {
    background: var(--gray);
    cursor: not-allowed;
}

.error-message {
    background: #ffebee;
    color: var(--error);
    padding: 10px;
    border-radius: 5px;
    margin-top: 15px;
    text-align: center;
    display: none;
}

.loading {
    display: none;
    text-align: center;
    margin-top: 15px;
}

.loading i {
    color: var(--primary);
    font-size: 20px;
}

.security-notice {
    text-align: center;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid #e0e0e0;
    font-size: 12px;
    color: var(--gray);
}