/* ========================================
   MODERN LOGIN PAGE - CSS
   Version: 2.0.0
   Last Updated: March 9, 2026
======================================== */

/* ========================================
   CSS VARIABLES - THEME SYSTEM
======================================== */
:root {
    /* Light Mode Colors */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --bg-input: #f1f5f9;
    --bg-gradient-start: #667eea;
    --bg-gradient-end: #764ba2;
    
    /* Text Colors */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --text-inverse: #ffffff;
    
    /* Border Colors */
    --border-color: #e2e8f0;
    --border-focus: #667eea;
    
    /* Shadow */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Brand Colors */
    --brand-primary: #667eea;
    --brand-secondary: #764ba2;
    --success: #10b981;
    --error: #ef4444;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 50px;
    
    /* Transitions */
    --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s ease;
}

[data-theme="dark"] {
    /* Dark Mode Colors */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #1e293b;
    --bg-input: #334155;
    --bg-gradient-start: #667eea;
    --bg-gradient-end: #764ba2;
    
    /* Text Colors */
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --text-inverse: #0f172a;
    
    /* Border Colors */
    --border-color: #334155;
    --border-focus: #818cf8;
    
    /* Shadow */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
}

/* ========================================
   GLOBAL STYLES
======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    overflow: hidden;
    height: 100vh;
}

body {
    font-family: 'Inter', 'Tajawal', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 0;
    line-height: 1.6;
    position: relative;
    transition: var(--transition-base);
}

/* ========================================
   TOP CONTROLS (LANGUAGE & THEME)
======================================== */
.top-controls {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 1000;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: nowrap;
}

/* ========================================
   LANGUAGE TOGGLE
======================================== */
.language-toggle {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-full);
    padding: 0.25rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    box-shadow: var(--shadow-lg);
    transition: var(--transition-base);
}

.lang-btn {
    background: transparent;
    border: none;
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-full);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.375rem;
    transition: var(--transition-base);
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-secondary);
    white-space: nowrap;
}

.lang-btn:hover {
    background: var(--bg-input);
    color: var(--text-primary);
}

.lang-btn.active {
    background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
    color: white;
}

.flag-icon {
    font-size: 1.125rem;
    line-height: 1;
    display: inline-block;
}

.lang-text {
    white-space: nowrap;
    font-size: 0.8125rem;
}

/* ========================================
   THEME TOGGLE BUTTON
======================================== */
.theme-toggle {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-full);
    padding: 0.375rem 0.875rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.375rem;
    box-shadow: var(--shadow-lg);
    transition: var(--transition-base);
    white-space: nowrap;
}

.theme-toggle:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
    border-color: var(--brand-primary);
}

.theme-toggle:active {
    transform: translateY(0);
}

.theme-toggle-icon {
    font-size: 1.25rem;
    color: var(--text-primary);
    transition: var(--transition-base);
}

.theme-toggle-text {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
}

/* ========================================
   LOGIN CONTAINER
======================================== */
.login-container {
    width: 100%;
    max-width: 1200px;
    height: 90vh;
    max-height: 700px;
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    display: grid;
    grid-template-columns: 1fr 1fr;
    margin: 0 var(--spacing-md);
    position: relative;
}

/* ========================================
   LEFT SIDE - LOGIN FORM
======================================== */
.login-form-section {
    padding: var(--spacing-2xl) var(--spacing-2xl);
    display: flex;
    flex-direction: column;
    justify-content: center;
    background: var(--bg-card);
    transition: var(--transition-base);
    overflow-y: auto;
}

/* Custom scrollbar for login form */
.login-form-section::-webkit-scrollbar {
    width: 6px;
}

.login-form-section::-webkit-scrollbar-track {
    background: transparent;
}

.login-form-section::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.login-form-section::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

.logo-container {
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.logo-container img {
    max-width: 140px;
    max-height: 70px;
    height: auto;
    transition: var(--transition-base);
    filter: drop-shadow(var(--shadow-sm));
}

.login-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.login-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    transition: var(--transition-base);
    letter-spacing: -0.02em;
}

.login-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    transition: var(--transition-base);
    font-weight: 400;
}

/* ========================================
   FORM STYLES
======================================== */
.login-form {
    width: 100%;
    max-width: 420px;
    margin: 0 auto;
}

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

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    transition: var(--transition-base);
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.125rem;
    color: var(--text-muted);
    transition: var(--transition-base);
    pointer-events: none;
    z-index: 1;
}

.form-input {
    width: 100%;
    padding: 0.875rem var(--spacing-md);
    padding-left: 3rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    color: var(--text-primary);
    background: var(--bg-input);
    transition: var(--transition-base);
    outline: none;
    font-family: inherit;
}

.form-input::placeholder {
    color: var(--text-muted);
    opacity: 0.7;
}

.form-input:hover {
    border-color: var(--text-muted);
}

.form-input:focus {
    border-color: var(--border-focus);
    background: var(--bg-card);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
}

.form-input:focus + .input-icon {
    color: var(--brand-primary);
}

.form-input.border-danger {
    border-color: var(--error);
    background: rgba(239, 68, 68, 0.05);
}

.form-input.border-danger:focus {
    box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.1);
}

.text-danger {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--error);
    margin-top: 0.5rem;
    font-weight: 600;
    background-color: rgba(239, 68, 68, 0.1);
    padding: 0.5rem 0.75rem;
    border-radius: 0.375rem;
    border-left: 3px solid var(--error);
    animation: slideDown 0.3s ease-out;
}

.text-danger i {
    font-size: 1rem;
    flex-shrink: 0;
}

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

/* Password Toggle */
.password-toggle {
    position: absolute;
    right: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    font-size: 1.125rem;
    color: var(--text-muted);
    transition: var(--transition-base);
    z-index: 2;
    padding: var(--spacing-sm);
}

.password-toggle:hover {
    color: var(--brand-primary);
}

/* ========================================
   CHECKBOX STYLES
======================================== */
.remember-me {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.custom-checkbox {
    position: relative;
    display: inline-block;
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.custom-checkbox input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    width: 100%;
    height: 100%;
    z-index: 2;
    margin: 0;
}

.checkbox-mark {
    position: absolute;
    top: 0;
    left: 0;
    height: 20px;
    width: 20px;
    background: var(--bg-input);
    border: 2px solid var(--border-color);
    border-radius: 6px;
    transition: var(--transition-base);
}

.custom-checkbox:hover .checkbox-mark {
    border-color: var(--brand-primary);
}

.custom-checkbox input:checked ~ .checkbox-mark {
    background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
    border-color: var(--brand-primary);
}

.checkbox-mark:after {
    content: "";
    position: absolute;
    display: none;
    left: 6px;
    top: 2px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.custom-checkbox input:checked ~ .checkbox-mark:after {
    display: block;
}

.checkbox-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    cursor: pointer;
    user-select: none;
    font-weight: 500;
}

/* ========================================
   BUTTON STYLES
======================================== */
.btn-login {
    width: 100%;
    padding: 1rem var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-inverse);
    background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
    cursor: pointer;
    transition: var(--transition-base);
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
    font-family: inherit;
}

.btn-login:before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-login:hover:before {
    left: 100%;
}

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

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

.btn-login:disabled:hover {
    transform: none;
}

/* ========================================
   RIGHT SIDE - BRANDING
======================================== */
.branding-section {
    background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
    padding: var(--spacing-2xl) var(--spacing-xl);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: white;
    position: relative;
    overflow: hidden;
}

.branding-section:before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    animation: pulse 15s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { 
        transform: scale(1); 
        opacity: 0.5; 
    }
    50% { 
        transform: scale(1.1); 
        opacity: 0.3; 
    }
}

.branding-content {
    position: relative;
    z-index: 1;
    max-width: 480px;
}

.branding-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    letter-spacing: -0.02em;
}

.branding-description {
    font-size: 0.9375rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.95;
    line-height: 1.6;
}

.features-list {
    list-style: none;
    padding: 0;
    margin: 0;
    text-align: left;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    backdrop-filter: blur(10px);
    transition: var(--transition-base);
}

.feature-item:last-child {
    margin-bottom: 0;
}

.feature-item:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateX(-5px);
}

.feature-icon {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.125rem;
    flex-shrink: 0;
}

.feature-text {
    flex: 1;
    text-align: left;
}

.feature-title {
    font-size: 0.9375rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    line-height: 1.4;
}

.feature-description {
    font-size: 0.8125rem;
    opacity: 0.9;
    line-height: 1.5;
}

/* ========================================
   LOADING STATE
======================================== */
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.8s linear infinite;
}

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

/* ========================================
   ANIMATIONS
======================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-container {
    animation: fadeInUp 0.6s ease-out;
}

.top-controls {
    animation: fadeInUp 0.6s ease-out 0.2s both;
}

/* Language overlay during switch */
.language-changing * {
    transition: none !important;
}

.language-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(3px);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.2s ease-in-out;
}

.language-loader {
    width: 50px;
    height: 50px;
    border: 3px solid rgba(255, 255, 255, 0.2);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* ========================================
   RESPONSIVE DESIGN
======================================== */

/* Large Tablets and Small Desktops */
@media (max-width: 1200px) {
    .login-container {
        max-width: 1000px;
    }
    
    .branding-title {
        font-size: 2rem;
    }
}

/* Tablets */
@media (max-width: 992px) {
    .login-container {
        grid-template-columns: 1fr;
        max-width: 500px;
        height: 95vh;
        max-height: none;
        margin: 0 var(--spacing-md);
    }

    .branding-section {
        display: none;
    }

    .login-form-section {
        padding: var(--spacing-xl) var(--spacing-lg);
    }

    .top-controls {
        top: var(--spacing-md);
        right: var(--spacing-md);
        gap: 0.5rem;
    }

    .theme-toggle {
        padding: 0.375rem 0.75rem;
    }

    .language-toggle {
        padding: 0.25rem;
    }

    .lang-btn {
        padding: 0.375rem 0.625rem;
    }
}

/* Mobile Landscape */
@media (max-width: 768px) {
    html {
        font-size: 15px;
    }

    body {
        padding: 0;
    }

    .login-container {
        height: 100vh;
        max-height: none;
        margin: 0;
        border-radius: 0;
    }

    .login-form-section {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .logo-container {
        margin-bottom: var(--spacing-md);
    }

    .logo-container img {
        max-width: 100px;
        max-height: 50px;
    }

    .login-header {
        margin-bottom: var(--spacing-md);
    }

    .login-title {
        font-size: 1.5rem;
    }

    .top-controls {
        top: 0.75rem;
        right: 0.75rem;
        gap: 0.5rem;
    }
}

/* Mobile Portrait */
@media (max-width: 576px) {
    html {
        font-size: 14px;
    }

    body {
        padding: 0;
    }

    .login-container {
        height: 100vh;
        max-height: none;
        margin: 0;
        border-radius: 0;
    }

    .login-form-section {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .logo-container {
        margin-bottom: var(--spacing-sm);
    }

    .logo-container img {
        max-width: 90px;
        max-height: 45px;
    }

    .login-header {
        margin-bottom: var(--spacing-sm);
    }

    .login-title {
        font-size: 1.375rem;
    }

    .login-subtitle {
        font-size: 0.875rem;
    }

    .top-controls {
        top: 0.5rem;
        right: 0.5rem;
        gap: 0.375rem;
    }

    .theme-toggle {
        padding: 0.375rem 0.5rem;
    }

    .theme-toggle-text {
        display: none;
    }

    .theme-toggle-icon {
        font-size: 1rem;
    }

    .language-toggle {
        padding: 0.25rem;
    }

    .lang-btn {
        padding: 0.375rem 0.5rem;
        gap: 0.25rem;
    }

    .lang-text {
        display: none;
    }

    .flag-icon {
        font-size: 1rem;
    }

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

    .remember-me {
        margin-bottom: var(--spacing-md);
    }

    .btn-login {
        padding: 0.875rem var(--spacing-md);
    }
}

/* Small Mobile */
@media (max-width: 380px) {
    body {
        padding: 0;
    }

    .login-container {
        height: 100vh;
        margin: 0;
        border-radius: 0;
    }

    .login-form-section {
        padding: var(--spacing-md);
    }

    .logo-container {
        margin-bottom: 0.5rem;
    }

    .logo-container img {
        max-width: 80px;
        max-height: 40px;
    }

    .login-header {
        margin-bottom: 0.5rem;
    }

    .login-title {
        font-size: 1.25rem;
    }

    .login-subtitle {
        font-size: 0.8125rem;
    }

    .form-input {
        font-size: 0.9375rem;
        padding: 0.75rem var(--spacing-md);
        padding-left: 2.75rem;
    }

    .input-icon {
        font-size: 1rem;
        left: 0.75rem;
    }

    .btn-login {
        padding: 0.75rem var(--spacing-md);
    }

    .top-controls {
        top: 0.375rem;
        right: 0.375rem;
        gap: 0.25rem;
    }

    .theme-toggle {
        padding: 0.375rem;
    }

    .theme-toggle-icon {
        font-size: 0.875rem;
    }

    .language-toggle {
        padding: 0.25rem;
    }

    .lang-btn {
        padding: 0.375rem;
    }

    .flag-icon {
        font-size: 0.875rem;
    }

    .form-group {
        margin-bottom: 0.5rem;
    }

    .remember-me {
        margin-bottom: 0.75rem;
    }
}

/* ========================================
   ACCESSIBILITY
======================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus Visible for Keyboard Navigation */
.theme-toggle:focus-visible,
.form-input:focus-visible,
.btn-login:focus-visible,
.custom-checkbox input:focus-visible ~ .checkbox-mark {
    outline: 2px solid var(--brand-primary);
    outline-offset: 2px;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --text-primary: #000000;
    }

    [data-theme="dark"] {
        --border-color: #ffffff;
        --text-primary: #ffffff;
    }
}

/* Print Styles */
@media print {
    .theme-toggle,
    .language-toggle {
        display: none;
    }

    .branding-section {
        display: none;
    }

    .login-container {
        box-shadow: none;
        border: 1px solid #e2e8f0;
    }
}