/* LMS/assets/css/styles.css */

/* ============================================
   CSS TOKENS & DESIGN SYSTEM
   ============================================ */

:root {
    /* Colors - Primary Palette */
    --primary: #4a90e2;
    --primary-dark: #3a7bc8;
    --primary-light: #e3f2fd;
    --secondary: #f59e0b;
    --secondary-dark: #d97706;
    --secondary-light: #fef3c7;
    
    /* Semantic Colors */
    --success: #10b981;
    --success-light: #d1fae5;
    --warning: #f59e0b;
    --warning-light: #fef3c7;
    --danger: #ef4444;
    --danger-light: #fee2e2;
    --info: #3b82f6;
    --info-light: #dbeafe;
    
    /* Neutral Colors */
    --white: #ffffff;
    --black: #000000;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* Surface & Background */
    --background: #f8f9fa;
    --surface: #ffffff;
    --surface-hover: #f9fafb;
    --border: #e5e7eb;
    
    /* Text Colors */
    --text: #1f2937;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #4a90e2 0%, #357abd 100%);
    --gradient-secondary: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    --gradient-success: linear-gradient(135deg, #10b981 0%, #059669 100%);
    
    /* Spacing Scale */
    --spacing-xs: 0.25rem;    /* 4px */
    --spacing-sm: 0.5rem;     /* 8px */
    --spacing: 1rem;          /* 16px */
    --spacing-lg: 1.5rem;     /* 24px */
    --spacing-xl: 2rem;       /* 32px */
    --spacing-2xl: 3rem;      /* 48px */
    --spacing-3xl: 4rem;      /* 64px */
    
    /* Border Radius */
    --radius-sm: 0.25rem;     /* 4px */
    --radius: 0.5rem;         /* 8px */
    --radius-lg: 0.75rem;     /* 12px */
    --radius-xl: 1rem;        /* 16px */
    --radius-full: 9999px;    /* Full rounded */
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --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);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Z-Index Scale */
    --z-dropdown: 1000;
    --z-modal: 1050;
    --z-toast: 1100;
    --z-tooltip: 1150;
}

/* ============================================
   GLOBAL RESETS & BASE STYLES
   ============================================ */

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text);
    background: var(--background);
}

/* RTL Support */
[dir="rtl"] {
    direction: rtl;
}

[dir="rtl"] .nav-menu {
    margin-right: auto;
    margin-left: 0;
}

[dir="rtl"] .user-dropdown {
    margin-left: 0;
    margin-right: var(--spacing);
}

/* ============================================
   NAVIGATION
   ============================================ */

.main-nav {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing);
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 64px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.nav-brand a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    color: var(--text);
}

.nav-logo {
    height: 36px;
    width: auto;
}

.nav-brand-text {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text);
    transition: var(--transition-base);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-left: auto;
    margin-right: var(--spacing-lg);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing);
    border-radius: var(--radius);
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition-base);
    position: relative;
}

.nav-link:hover {
    background: var(--surface-hover);
    color: var(--primary);
}

.nav-link.active {
    background: var(--primary-light);
    color: var(--primary);
}

.nav-icon {
    font-size: 1.25rem;
}

.nav-badge {
    position: absolute;
    top: 4px;
    right: 4px;
    min-width: 18px;
    height: 18px;
    padding: 0 4px;
    background: var(--danger);
    color: var(--white);
    border-radius: var(--radius-full);
    font-size: 0.625rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-user {
    display: flex;
    align-items: center;
    gap: var(--spacing);
}

.lang-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    background: var(--surface-hover);
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition-base);
}

.lang-toggle:hover {
    background: var(--primary-light);
}

.lang-icon {
    font-size: 1.25rem;
}

.user-dropdown {
    position: relative;
}

.user-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: none;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: var(--transition-base);
}

.user-toggle:hover {
    border-color: var(--primary);
    background: var(--surface-hover);
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    object-fit: cover;
}

.user-avatar-placeholder {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
}

.user-name {
    font-weight: 600;
    max-width: 150px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.dropdown-arrow {
    font-size: 0.75rem;
    transition: var(--transition-base);
}

.user-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 200px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition-base);
    z-index: var(--z-dropdown);
}

.user-menu.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.user-menu-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing);
    text-decoration: none;
    color: var(--text);
    transition: var(--transition-base);
}

.user-menu-item:hover {
    background: var(--surface-hover);
}

.user-menu-item.text-danger {
    color: var(--danger);
}

.menu-icon {
    font-size: 1.125rem;
}

.menu-divider {
    margin: var(--spacing-xs) 0;
    border: none;
    border-top: 1px solid var(--border);
}

/* Mobile Navigation */
@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--surface);
        border-top: 1px solid var(--border);
        flex-direction: column;
        align-items: stretch;
        padding: var(--spacing);
        max-height: 0;
        overflow: hidden;
        transition: var(--transition-base);
    }
    
    .nav-menu.active {
        max-height: 500px;
    }
    
    .nav-link {
        justify-content: flex-start;
        padding: var(--spacing);
    }
    
    .user-name {
        display: none;
    }
}

/* ============================================
   FOOTER
   ============================================ */

.main-footer {
    background: var(--gray-900);
    color: var(--gray-300);
    margin-top: var(--spacing-3xl);
    padding: var(--spacing-2xl) var(--spacing);
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section h3 {
    color: var(--white);
    margin-bottom: var(--spacing);
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-links a {
    color: var(--gray-300);
    text-decoration: none;
    transition: var(--transition-base);
}

.footer-links a:hover {
    color: var(--primary);
}

.footer-bottom {
    border-top: 1px solid var(--gray-700);
    padding-top: var(--spacing);
    text-align: center;
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 1rem;
    font-weight: 600;
    border: 2px solid transparent;
    border-radius: var(--radius);
    cursor: pointer;
    text-decoration: none;
    transition: var(--transition-base);
    white-space: nowrap;
}

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

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    border-color: var(--primary);
}

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

.btn-secondary {
    background: var(--surface);
    color: var(--text);
    border-color: var(--border);
}

.btn-secondary:hover:not(:disabled) {
    border-color: var(--primary);
    background: var(--surface-hover);
}

.btn-success {
    background: var(--gradient-success);
    color: var(--white);
    border-color: var(--success);
}

.btn-danger {
    background: var(--danger);
    color: var(--white);
    border-color: var(--danger);
}

.btn-danger:hover:not(:disabled) {
    background: #dc2626;
}

.btn-warning {
    background: var(--warning);
    color: var(--black);
    border-color: var(--warning);
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing);
    font-size: 0.875rem;
}

.btn-lg {
    padding: var(--spacing) var(--spacing-xl);
    font-size: 1.125rem;
}

.btn-block {
    width: 100%;
}

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ============================================
   FORM CONTROLS
   ============================================ */

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing);
}

.form-group label {
    font-weight: 600;
    color: var(--text);
}

.form-control {
    padding: var(--spacing-sm) var(--spacing);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    font-size: 1rem;
    transition: var(--transition-base);
    background: var(--surface);
    color: var(--text);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

.form-control:disabled {
    background: var(--gray-100);
    color: var(--text-muted);
    cursor: not-allowed;
}

.form-control-disabled {
    padding: var(--spacing-sm) var(--spacing);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    background: var(--gray-100);
    color: var(--text-muted);
    cursor: not-allowed;
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
    font-family: inherit;
}

.help-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.required {
    color: var(--danger);
}

/* ============================================
   STATUS BADGES
   ============================================ */

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    white-space: nowrap;
}

.status-pending {
    background: var(--warning-light);
    color: var(--warning);
}

.status-given,
.status-completed,
.status-attended {
    background: var(--success-light);
    color: var(--success);
}

.status-absent,
.status-missed {
    background: var(--danger-light);
    color: var(--danger);
}

.status-excused {
    background: var(--info-light);
    color: var(--info);
}

.status-covered {
    background: var(--secondary-light);
    color: var(--secondary);
}

.status-upcoming {
    background: var(--primary-light);
    color: var(--primary);
}

/* ============================================
   PROGRESS RINGS (for XP/Achievement)
   ============================================ */

.progress-ring {
    position: relative;
    width: 120px;
    height: 120px;
}

.progress-ring-circle {
    transform: rotate(-90deg);
    transform-origin: 50% 50%;
}

.progress-ring-background {
    fill: none;
    stroke: var(--gray-200);
    stroke-width: 8;
}

.progress-ring-progress {
    fill: none;
    stroke: url(#progressGradient);
    stroke-width: 8;
    stroke-linecap: round;
    transition: stroke-dashoffset 0.5s ease;
}

.progress-ring-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.progress-ring-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.progress-ring-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
}

/* ============================================
   ACHIEVEMENT POPUP
   ============================================ */

.achievement-popup {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-base);
}

.achievement-popup.show {
    opacity: 1;
    visibility: visible;
}

.achievement-content {
    background: var(--surface);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    max-width: 400px;
    text-align: center;
    box-shadow: var(--shadow-2xl);
    transform: scale(0.8);
    transition: var(--transition-base);
    animation: achievementBounce 0.5s ease forwards;
}

.achievement-popup.show .achievement-content {
    transform: scale(1);
}

@keyframes achievementBounce {
    0% {
        transform: scale(0.5) rotate(-5deg);
    }
    50% {
        transform: scale(1.1) rotate(2deg);
    }
    100% {
        transform: scale(1) rotate(0);
    }
}

.achievement-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing);
    animation: achievementPulse 1s ease infinite;
}

@keyframes achievementPulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
}

.achievement-content h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.achievement-content p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* ============================================
   COUNTDOWN TIMER
   ============================================ */

.countdown-timer {
    display: flex;
    gap: var(--spacing);
    justify-content: center;
    align-items: center;
}

.countdown-segment {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.countdown-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    background: var(--primary-light);
    padding: var(--spacing-sm) var(--spacing);
    border-radius: var(--radius);
    min-width: 60px;
    text-align: center;
}

.countdown-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.countdown-separator {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-muted);
}

/* ============================================
   SKELETON LOADERS
   ============================================ */

.skeleton {
    background: linear-gradient(
        90deg,
        var(--gray-200) 0%,
        var(--gray-100) 50%,
        var(--gray-200) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
    border-radius: var(--radius);
}

@keyframes skeleton-loading {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

.skeleton-text {
    height: 1rem;
    margin-bottom: var(--spacing-sm);
}

.skeleton-title {
    height: 1.5rem;
    width: 60%;
    margin-bottom: var(--spacing);
}

.skeleton-card {
    height: 200px;
    border-radius: var(--radius-lg);
}

.skeleton-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
}

/* ============================================
   CARDS
   ============================================ */

.card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing);
    padding-bottom: var(--spacing);
    border-bottom: 2px solid var(--border);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
}

.card-body {
    margin-bottom: var(--spacing);
}

.card-footer {
    padding-top: var(--spacing);
    border-top: 1px solid var(--border);
}

/* ============================================
   ALERTS
   ============================================ */

.alert {
    padding: var(--spacing);
    border-radius: var(--radius);
    margin-bottom: var(--spacing);
    border-left: 4px solid;
}

.alert-info {
    background: var(--info-light);
    color: var(--info);
    border-left-color: var(--info);
}

.alert-success {
    background: var(--success-light);
    color: var(--success);
    border-left-color: var(--success);
}

.alert-warning {
    background: var(--warning-light);
    color: var(--warning);
    border-left-color: var(--warning);
}

.alert-danger {
    background: var(--danger-light);
    color: var(--danger);
    border-left-color: var(--danger);
}

/* ============================================
   UTILITIES
   ============================================ */

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing);
}

.text-center {
    text-align: center;
}

.text-success {
    color: var(--success);
}

.text-danger {
    color: var(--danger);
}

.text-muted {
    color: var(--text-muted);
}

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing); }
.mt-4 { margin-top: var(--spacing-lg); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing); }
.mb-4 { margin-bottom: var(--spacing-lg); }

/* ============================================
   MICRO-INTERACTIONS (CSS only)
   ============================================ */

/* Smooth hover lift */
.hover-lift {
    transition: var(--transition-base);
}

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

/* Pulse animation for notifications */
.pulse {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

/* Fade in animation */
.fade-in {
    animation: fadeIn 0.3s ease-in;
}

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

/* Shine effect on cards */
.shine {
    position: relative;
    overflow: hidden;
}

.shine::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.3),
        transparent
    );
    transition: var(--transition-slow);
}

.shine:hover::before {
    left: 100%;
}

/* Loading spinner */
.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

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

@media (max-width: 1200px) {
    :root {
        font-size: 15px;
    }
}

@media (max-width: 768px) {
    :root {
        font-size: 14px;
    }
    
    .card {
        padding: var(--spacing);
    }
    
    .countdown-value {
        font-size: 1.5rem;
        min-width: 50px;
    }
}

@media (max-width: 480px) {
    .btn {
        padding: var(--spacing-sm) var(--spacing);
        font-size: 0.875rem;
    }
    
    .countdown-timer {
        gap: var(--spacing-sm);
    }
    
    .countdown-value {
        font-size: 1.25rem;
        min-width: 40px;
        padding: var(--spacing-xs) var(--spacing-sm);
    }
}

/* RTL-specific adjustments */
[dir="rtl"] .card-header {
    flex-direction: row-reverse;
}

[dir="rtl"] .btn {
    flex-direction: row-reverse;
}

[dir="rtl"] .alert {
    border-left: none;
    border-right: 4px solid;
}

[dir="rtl"] .progress-ring {
    transform: scaleX(-1);
}