/* --- Base Styles Provided By You --- */

/* General Body Styles */
body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    margin: 0;
    padding-top: 70px;
    /* Reduced space */
    padding-bottom: var(--footer-height-mobile);
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    unicode-bidi: plaintext;

    /* Security: Prevent text selection */
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

/* Global RTL/Arabic Optimization */
h1,
h2,
h3,
h4,
p,
div,
span,
a {
    unicode-bidi: plaintext;
    text-align: initial;
}

/* Allow selection in inputs and textareas only */
input,
textarea,
select,
[contenteditable="true"] {
    -webkit-user-select: text;
    -moz-user-select: text;
    -ms-user-select: text;
    user-select: text;
    font-family: var(--font-primary);
    unicode-bidi: plaintext;
}

/* Header Banner - Dark Teal Glass */
.main-header {
    background: linear-gradient(135deg, rgba(4, 47, 46, 0.97) 0%, rgba(6, 95, 70, 0.97) 100%);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    color: var(--text-inverse);
    padding: 0 var(--space-4);
    height: 64px;
    box-shadow: 0 2px 20px rgba(4, 47, 46, 0.4);
    border-bottom: 1px solid rgba(15, 148, 136, 0.3);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
}

#site-title {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--accent-400);
    text-shadow: 0 0 20px rgba(251, 191, 36, 0.3);
}



/* User Pill (Profile Badge) */
.user-pill {
    position: absolute;
    right: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
}

/* Main Content Container */
.container {
    max-width: 1100px;
    margin: var(--space-8) auto;
    padding: 0 var(--space-4);
}

/* Page Header Navigation */
.page-header-nav {
    display: grid !important;
    grid-template-columns: 100px 1fr 100px !important;
    align-items: center !important;
    gap: var(--space-2) !important;
    margin: 0 0 var(--space-4) !important;
    width: 100% !important;
    direction: rtl !important;
}

/* Ensure the back link is in the third grid cell (Left - Same side as hamburger) */
#nav-container,
.page-header-nav>.back-link {
    grid-column: 3;
    display: flex;
    justify-content: flex-end;
}

/* Ensure title is in the center cell */
.page-title {
    grid-column: 2;
    background: rgba(255, 255, 255, 0.9) !important;
    color: var(--primary-color) !important;
    padding: 0 var(--space-4) !important;
    border-radius: var(--radius-full) !important;
    box-shadow: var(--shadow-sm) !important;
    border: 1px solid rgba(99, 102, 241, 0.2) !important;
    backdrop-filter: blur(10px);
    font-size: 0.95rem !important;
    font-weight: 600 !important;
    margin: 0 !important;
    text-align: center !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    height: 40px !important;
    min-width: 0 !important;
}

/* Add an empty placeholder in the first cell (Right) to balance the grid */
.page-header-nav::before {
    content: '';
    grid-column: 1;
}


/* Attractive Back Link Style */
.back-link {
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    padding: 0 14px !important;
    background: rgba(255, 255, 255, 0.95) !important;
    border: 1.5px solid var(--primary-100) !important;
    color: var(--primary-600) !important;
    border-radius: 12px !important;
    /* Modern rounded square */
    text-decoration: none !important;
    font-size: 0.9rem !important;
    font-weight: 700 !important;
    white-space: nowrap !important;
    height: 38px !important;
    margin: 0 !important;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
    box-shadow: 0 2px 8px rgba(15, 148, 136, 0.08) !important;
    gap: 8px !important;
}

.back-link i {
    font-size: 0.8rem;
    color: var(--primary-500);
}

.back-link:hover {
    background: var(--primary-50) !important;
    border-color: var(--primary-300) !important;
    color: var(--primary-700) !important;
    transform: translateX(-3px) !important;
    /* Slide slightly towards the left */
    box-shadow: 0 4px 12px rgba(15, 148, 136, 0.15) !important;
}

.back-link:active {
    transform: scale(0.95) translateX(-2px) !important;
}

/* Simple Clean Card Grid */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    padding: 10px 0;
}

/* Simple Card Style */
.card {
    background-color: #ffffff;
    border-radius: 16px;
    padding: 24px;
    box-shadow: var(--shadow-md);
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    border: 1px solid rgba(0, 0, 0, 0.04);
    text-align: right;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    min-height: auto;
    position: relative;
    overflow: hidden;
    gap: 15px;
    animation: fadeInUp 0.6s ease outset;
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-200);
}

.card::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 6px;
    height: 100%;
    background: var(--primary-500);
}

.card--quiz::after {
    background: #8b5cf6;
}

.card--flashcards::after {
    background: #f59e0b;
}

.card--video::after {
    background: #ef4444;
}

.card--document::after {
    background: #10b981;
}

.card--year::after {
    background: var(--card-accent, var(--primary-500));
}

.card--year:hover {
    border-color: var(--card-accent);
}



.card h2 {
    font-size: 1.05rem;
    font-weight: 600;
    margin: 0;
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-primary);
    line-height: 1.3;
}

.card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin: 6px 0 0;
    line-height: 1.5;
    font-weight: 400;
    opacity: 0.85;
}

/* --- Card Styles (Locked State) --- */
.card.locked {
    opacity: 0.7;
    filter: grayscale(0.8);
    cursor: not-allowed;
    position: relative;
    background: #f1f5f9;
}

.card.locked:hover {
    transform: none;
    box-shadow: none;
}

.card.locked::after {
    content: '🔒';
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 1.2rem;
    opacity: 0.8;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.card h2 {
    margin: 0;
    font-size: 1.3em;
    color: inherit;
    position: relative;
    /* Ensures title is above watermarks */
    z-index: 2;
}

/* Toolbar for buttons */
.toolbar {
    margin-bottom: 30px;
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

/* Footer */
.main-footer {
    background-color: #ffffff;
    color: var(--text-secondary);
    padding: 15px 0;
    text-align: center;
    position: fixed;
    bottom: 0;
    width: 100%;
    font-size: 0.85em;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    z-index: 1000;
}

/* Simple Icon Style */
.card h2::before {
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    font-size: 1.2rem;
    color: var(--primary-color);
}

.card.card--lesson h2::before {
    content: "\f518";
    /* book-open */
}

/* Quiz Card Identity */
.card.card--quiz h2::before {
    content: "MCQs";
    font-family: 'Segoe UI', sans-serif;
    font-weight: 800;
    padding: 0;
    border: 3px solid var(--primary-color);
    border-radius: 20px;
    font-size: 0.75rem;
    color: var(--primary-color);
    background: #ffffff;
}

.card.card--quiz:hover h2::before {
    background: var(--primary-color);
    color: #ffffff;
    border-color: #ffffff;
}

/* Flashcards Deck Identity */
.card.card--flashcards h2::before {
    content: "\f24d";
    /* clone */
    color: var(--card-flashcards);
    background: rgba(139, 92, 246, 0.1);
    border-color: rgba(139, 92, 246, 0.2);
}

.card.card--flashcards:hover h2::before {
    background: var(--card-flashcards);
    color: #ffffff;
}

/* Google Form Card Identity */
.card.card--google-form h2::before {
    content: "\f1c3";
    /* file-alt */
    color: var(--card-google-form);
    background: rgba(16, 185, 129, 0.1);
    border-color: rgba(16, 185, 129, 0.2);
}

.card.card--google-form:hover h2::before {
    background: var(--card-google-form);
    color: #ffffff;
}

/* Document/PDF Card Identity */
.card.card--document h2::before {
    content: "\f1c1";
    /* file-pdf */
    color: #e55039;
    background: rgba(229, 80, 57, 0.1);
    border-color: rgba(229, 80, 57, 0.2);
}

.card.card--document:hover h2::before {
    background: #e55039;
    color: #ffffff;
}

.card.card--document::after {
    content: "PDF";
}

/* Watermark Styles */
.card.card--quiz::after,
.card.card--flashcards::after {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) rotate(-20deg);
    font-size: 5rem;
    font-weight: 800;
    color: rgba(255, 255, 255, 0.1);
    z-index: 1;
    pointer-events: none;
    font-family: 'Segoe UI', Tahoma, sans-serif;
}

.card.card--quiz::after {
    content: "MCQS";
}

.card.card--flashcards::after {
    content: "CARDS";
}

/* ========================================= */
/* ===== STYLES FOR VIDEO CARDS        ===== */
/* ========================================= */

.card--video {
    padding: 0;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.card--video:hover .video-card__thumbnail img {
    transform: scale(1.05);
}

.video-card__thumbnail {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background-color: #e0e0e0;
    /* Placeholder color */
}

.video-card__thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.video-card__play-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 50px;
    height: 50px;
    background-color: rgba(0, 0, 0, 0.6);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: background-color 0.2s ease;
}

.card--video:hover .video-card__play-icon {
    background-color: var(--primary-color);
}

.video-card__play-icon svg {
    width: 28px;
    height: 28px;
    margin-left: 3px;
    /* Optical alignment */
}

.video-card__title {
    padding: 1rem;
    margin: 0;
    font-size: 1.1rem;
    flex-grow: 1;
    /* Ensures title area fills space */
}

/* --- User Authentication Styles --- */
.user-pill {
    display: flex;
    align-items: center;
    gap: 10px;
    background-color: rgba(255, 255, 255, 0.1);
    padding: 5px 10px;
    border-radius: 50px;
    transition: background-color 0.3s;
}

.user-pill:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

.login-btn {
    background-color: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 4px 12px;
    /* Ultra-compact padding */
    border-radius: 50px;
    cursor: pointer;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 5px;
    /* Tighter gap */
    transition: all 0.3s ease;
    font-size: 0.85rem;
    /* Slightly smaller font */
}

.login-btn .fa-google {
    color: white;
    /* More elegant than multicolored in a glass button */
    font-size: 0.9em;
}

.login-btn:hover {
    background-color: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-1px);
}

.user-avatar {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: 2px solid white;
}

.user-name {
    font-weight: 600;
    font-size: 0.9em;
}

.logout-btn {
    background: transparent;
    border: none;
    color: white;
    cursor: pointer;
    font-size: 0.8em;
    opacity: 0.7;
    transition: opacity 0.3s;
}

.logout-btn:hover {
    opacity: 1;
}

/* --- Lesson Completion Styles --- */
.card.completed {
    border-color: var(--success-color);
    /* Green border for completed items */
    background-color: var(--success-bg);
}

.completion-checkmark {
    position: absolute;
    top: 10px;
    right: 10px;
    font-size: 1.5em;
    color: var(--success-color);
    display: none;
    /* Hidden by default */
}

.card.completed .completion-checkmark {
    display: block;
}

/* --- Completion Button Styles --- */
.completion-button-container {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid #eee;
}

.mark-complete-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 25px;
    font-size: 1em;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
}

.mark-complete-btn:hover {
    background-color: #0056b3;
    transform: translateY(-2px);
}

.mark-complete-btn.completed {
    background-color: var(--success-color);
    cursor: default;
}

.mark-complete-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

/* ========================================= */
/* ===== MOBILE APP-LIKE EXPERIENCE    ===== */
/* ========================================= */

@media (max-width: 480px) {

    /* --- 1. Compact Header & Navigation --- */
    .main-header {
        padding: 10px 15px;
        height: var(--header-height-mobile);
        /* Fixed height control */
        box-sizing: border-box;
        /* Ensure padding is included in height */
    }

    .main-header {
        justify-content: flex-start;
        padding-left: 60px;
        padding-right: 15px;
        /* Space for hamburger on left on mobile */
    }

    .main-header h1 {
        font-size: 1rem;
        /* Scaled down title */
    }

    body {
        padding-top: var(--header-height-mobile);
        padding-bottom: var(--footer-height-mobile);
    }

    /* Hide user name to save space, keep avatar */
    .user-name {
        display: none;
    }

    .login-btn {
        padding: 2px 8px;
        /* Absolute minimum on mobile */
        font-size: 0.75rem;
    }

    /* --- 2. Typography & Spacing --- */
    .container {
        padding: 0 15px;
        margin-top: 20px;
        margin-bottom: 30px;
    }

    .page-title {
        font-size: 1rem;
        height: 36px;
        padding: 5px 15px;
    }

    .page-header-nav {
        gap: 8px;
        margin-bottom: 15px;
    }

    .back-link {
        font-size: 0.8rem;
        padding: 5px 12px;
        height: 36px;
    }

    /* --- 3. App-like Cards --- */
    .card-grid {
        grid-template-columns: 1fr;
        /* Single column on phones */
        gap: 15px;
    }

    .card {
        padding: 15px;
        border-radius: var(--radius-app);
        /* Softer corners */
        box-shadow: var(--shadow-sm);
        /* Subtler shadow */
    }

    .card h2 {
        font-size: 1rem;
    }

    /* Adjust icon size */
    .card h2::before {
        font-size: 0.8em;
    }

    /* --- 4. Interactive Feedback (Touch) --- */
    .card:active {
        transform: scale(0.98);
        transition: transform 0.1s;
        background-color: var(--primary-50);
        /* Slight highlight */
    }

    /* --- 5. Footer Adjustments --- */
    .main-footer {
        height: var(--footer-height-mobile);
        box-sizing: border-box;
    }
}


/* --- Welcome Hero --- */
.welcome-hero {
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    min-height: 88vh;
    padding: 40px 20px;
    background: var(--gradient-hero);
    position: relative;
    overflow: hidden;
}

.welcome-hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(245, 158, 11, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.welcome-hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(15, 148, 136, 0.15) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    max-width: 640px;
    animation: fadeInUp 0.8s ease-out;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 2.8rem;
    color: #ffffff;
    margin-bottom: 16px;
    line-height: 1.2;
    text-align: center;
    font-weight: 800;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.hero-title .highlight {
    color: var(--accent-400);
    position: relative;
    display: inline-block;
    text-shadow: 0 0 30px rgba(251, 191, 36, 0.4);
}

.hero-subtitle {
    font-size: 1.15rem;
    color: rgba(255, 255, 255, 0.75);
    margin-bottom: 36px;
    text-align: center;
    line-height: 1.6;
}

.hero-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
}

/* User Pill (Modern Circular Avatar) */
.user-pill {
    position: absolute;
    right: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    overflow: hidden;
    cursor: pointer;
    border: 2px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.1);
}

.user-pill:hover {
    transform: scale(1.05);
    border-color: white;
    background: rgba(255, 255, 255, 0.2);
}

.user-avatar {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.user-name {
    display: none;
    /* Icon only for global App-like feel */
}

.logout-btn {
    display: none;
    /* Hidden by default, triggered by clicking the pill */
}

.btn-primary,
.btn-secondary {
    padding: 13px 30px;
    border-radius: var(--radius-full);
    font-weight: 700;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.25s var(--transition-bounce);
    border: none;
    font-family: var(--font-primary);
}

.btn-primary {
    background: var(--gradient-gold);
    color: var(--navy-900);
    box-shadow: var(--shadow-gold);
    letter-spacing: 0.01em;
}

.btn-primary:hover {
    transform: translateY(-3px) scale(1.03);
    box-shadow: 0 8px 28px rgba(245, 158, 11, 0.45);
    filter: brightness(1.05);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 1.5px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.6);
    transform: translateY(-2px);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}