/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Brand Colors */
    --primary-blue: #1D2242;
    --primary-orange: #FF3A0F;
    --secondary-blue: #2C3E50;
    --light-blue: #E8F4FD;
    --light-gray: #F8F9FA;
    --medium-gray: #6C757D;
    --dark-gray: #343A40;
    --white: #FFFFFF;
    --success-green: #28A745;
    --error-red: #DC3545;
    --warning-yellow: #FFC107;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Transitions */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--dark-gray);
    background: linear-gradient(135deg, var(--light-blue) 0%, var(--white) 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

/* Login Container */
.login-container {
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
}

.login-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-2xl);
    position: relative;
    overflow: hidden;
}

.login-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-blue) 0%, var(--primary-orange) 100%);
}

/* Logo Section */
.logo-section {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.logo {
    height: 60px;
    width: auto;
    max-width: 200px;
}

/* Banner Section */
.banner-section {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    opacity: 0.8;
}

.banner {
    height: 80px;
    width: auto;
    max-width: 100%;
    border-radius: var(--radius-md);
}

/* Form Section */
.form-section {
    margin-bottom: var(--spacing-xl);
}

.title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--primary-blue);
    text-align: center;
    margin-bottom: var(--spacing-sm);
}

.subtitle {
    font-size: var(--font-size-sm);
    color: var(--medium-gray);
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

/* Form Styles */
.login-form {
    margin-bottom: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group input {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid #E5E7EB;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    transition: all var(--transition-fast);
    background: var(--white);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(29, 34, 66, 0.1);
}

.form-group input:invalid {
    border-color: var(--error-red);
}

.form-group input:valid {
    border-color: var(--success-green);
}

/* Button Styles */
.submit-btn {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    color: var(--white);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.submit-btn:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.submit-btn:active {
    transform: translateY(0);
}

.submit-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

/* Spinner Animation */
.spinner {
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Message Styles */
.message {
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
}

.success-message {
    background: rgba(40, 167, 69, 0.1);
    border: 1px solid rgba(40, 167, 69, 0.2);
    color: var(--success-green);
}

.error-message {
    background: rgba(220, 53, 69, 0.1);
    border: 1px solid rgba(220, 53, 69, 0.2);
    color: var(--error-red);
}

.message-icon {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
}

.message-icon svg {
    width: 100%;
    height: 100%;
}

.message-content h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.message-content p {
    margin-bottom: var(--spacing-sm);
}

.small-text {
    font-size: var(--font-size-xs);
    opacity: 0.8;
}

/* Error Message */
.error-message {
    background: rgba(220, 53, 69, 0.1);
    border: 1px solid rgba(220, 53, 69, 0.2);
    color: var(--error-red);
}

.error-message .message-content {
    flex: 1;
}

.retry-btn {
    background: var(--error-red);
    color: var(--white);
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.retry-btn:hover {
    background: #c82333;
    transform: translateY(-1px);
}

/* Resend Section */
.resend-section {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--light-gray);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
}

.resend-text {
    font-size: var(--font-size-sm);
    color: var(--medium-gray);
    margin-bottom: var(--spacing-sm);
}

.resend-btn {
    background: transparent;
    color: var(--primary-blue);
    border: 1px solid var(--primary-blue);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.resend-btn:hover:not(:disabled) {
    background: var(--primary-blue);
    color: var(--white);
}

.resend-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.resend-cooldown {
    color: var(--medium-gray);
}

/* Footer */
.footer {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid #E5E7EB;
}

.footer-text {
    font-size: var(--font-size-sm);
    color: var(--medium-gray);
}

.footer-link {
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 500;
}

.footer-link:hover {
    text-decoration: underline;
}

/* Screen Reader Only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Responsive Design */
@media (max-width: 480px) {
    .login-container {
        padding: var(--spacing-sm);
    }
    
    .login-card {
        padding: var(--spacing-xl);
    }
    
    .title {
        font-size: var(--font-size-xl);
    }
    
    .logo {
        height: 50px;
    }
    
    .banner {
        height: 60px;
    }
}

@media (max-width: 320px) {
    .login-card {
        padding: var(--spacing-lg);
    }
    
    .title {
        font-size: var(--font-size-lg);
    }
}

/* Animation Classes */
.fade-in {
    animation: fadeIn var(--transition-normal) ease-in-out;
}

.fade-out {
    animation: fadeOut var(--transition-normal) ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeOut {
    from { opacity: 1; transform: translateY(0); }
    to { opacity: 0; transform: translateY(-10px); }
}

/* Focus Styles for Accessibility */
button:focus,
input:focus {
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    :root {
        --primary-blue: #000080;
        --primary-orange: #FF4500;
        --medium-gray: #000000;
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}