/* Global Styles */
:root {
    /* Blue/Slate Theme */
    --bg-gradient: #ffffff;
    --header-bg: rgba(248, 250, 252, 0.9);
    --glass-border: rgba(0, 0, 0, 0.1);
    --text-color: #0f172a;
    --text-dim: #475569;
    --accent-color: #0284c7;
    /* Sky Blue */
    --card-bg: #f3f4f6;
    /* Light gray */
    --hover-bg: rgba(0, 0, 0, 0.05);
    /* Arabic Font */
    --font-main: 'Tajawal', 'Segoe UI', sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Tajawal', 'Segoe UI', sans-serif !important;
    /* Force global font */
}

body {
    font-family: var(--font-main);
    background: var(--bg-gradient);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    padding-left: env(safe-area-inset-left);
    padding-right: env(safe-area-inset-right);
    padding-bottom: env(safe-area-inset-bottom);
}

/* Top Bar */
#top-bar {
    width: 100%;
    background: var(--header-bg);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 50;
    padding-top: max(1rem, env(safe-area-inset-top));
    padding-left: max(1rem, env(safe-area-inset-left));
    padding-right: max(1rem, env(safe-area-inset-right));
}

@media (min-width: 768px) {
    #top-bar {
        padding-left: max(2rem, env(safe-area-inset-left));
        padding-right: max(2rem, env(safe-area-inset-right));
    }
}

.header-content {
    max-width: 1600px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.logo-area h1 {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-color);
    margin: 0;
}

/* Horizontal Filters */
#filter-container {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex: 1;
    /* Take up remaining space */
    justify-content: center;
    /* Center properly */
}

.filter-group {
    min-width: 200px;
}

.glass-select {
    width: 100%;
    padding: 0.6rem 1rem;
    border-radius: 8px;
    border: 1px solid var(--glass-border);
    background: rgba(241, 245, 249, 0.6);
    color: white;
    font-family: var(--font-main);
    font-size: 0.95rem;
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%230284c7%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E");
    background-repeat: no-repeat;
    background-position: left 0.7rem top 50%;
    /* Left for RTL */
    background-size: 0.8rem auto;
    transition: all 0.2s;
}

.glass-select:hover {
    background: rgba(241, 245, 249, 0.9);
    border-color: var(--accent-color);
}

.glass-select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.2);
}

.user-badge {
    background: rgba(56, 189, 248, 0.1);
    color: var(--accent-color);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

/* Info Bar */
#info-bar {
    max-width: 1600px;
    margin: 0 auto;
    width: 100%;
    padding: 2rem 2rem 1rem 2rem;
}

#breadcrumbs {
    color: var(--text-dim);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

#current-context-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-color);
}

/* Main Content */
#main {
    flex: 1;
    overflow-y: auto;
    padding-bottom: 4rem;
}

#content {
    max-width: 1600px;
    margin: 0 auto;
    width: 100%;
    padding: 2rem;
}

/* Dynamic Grid (Subjects/Units/Lessons) */
.dynamic-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 1rem;
}

@media (min-width: 640px) {
    .dynamic-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 1.5rem;
    }

    gap: 1.5rem;
    width: 100%;
}

/* Interactive Cards (Subjects/Lessons) */
.card {
    background: #f3f4f6;
    /* Light gray */
    border: 1px solid #e5e7eb;
    /* Light gray border */
    border-radius: 12px;
    padding: 2.5rem 2rem 3.5rem 2rem;
    transition: all 0.2s ease;
    cursor: pointer;
    position: relative;
    overflow: visible;
    text-align: right;
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 190px;
}

.card:hover {
    transform: translateY(-4px);
    background: linear-gradient(135deg, rgba(226, 232, 240, 0.8), rgba(241, 245, 249, 0.9));
    border-color: var(--accent-color);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.card h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
    color: var(--text-color);
    z-index: 1;
}

.card p {
    color: var(--text-dim);
    font-size: 0.9rem;
    z-index: 1;
}

.card .icon {
    position: absolute;
    left: 2rem;
    top: 35%;
    transform: translateY(-50%);
    font-size: 4.5rem;
    opacity: 1;
    /* Make fully visible */
    color: var(--accent-color);
    z-index: 2;
    /* Bring to front */
}

/* Unit Accordion Styles (Still used for Units) */
.unit-section {
    grid-column: 1 / -1;
    /* Full width */
    margin-bottom: 1.5rem;
    animation: fadeIn 0.4s ease;
}

.unit-header {
    width: 100%;
    background: rgba(226, 232, 240, 0.4);
    padding: 1.5rem 2rem;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: all 0.2s;
    user-select: none;
}

.unit-header:hover {
    background: rgba(226, 232, 240, 0.8);
    border-color: var(--accent-color);
}

.unit-header h2 {
    font-size: 1.3rem;
    font-weight: 700;
    margin: 0;
    color: var(--text-color);
}

.unit-toggle-icon {
    font-size: 1.4rem;
    color: var(--accent-color);
    transition: transform 0.3s;
}

.unit-section.active .unit-toggle-icon {
    transform: rotate(180deg);
}

.unit-content {
    display: none;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
    padding-top: 1.5rem;
    animation: slideDown 0.3s ease-out;
}

.unit-section.active .unit-content {
    display: grid;
}

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

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

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

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

/* Viewer Modal */
#viewer {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--header-bg);
    /* Match Header Variable Exactly */
    backdrop-filter: blur(20px);
    width: 100%;
    height: 100%;
    padding-top: env(safe-area-inset-top);
    padding-bottom: env(safe-area-inset-bottom);
    z-index: 1000;
    display: none;
    flex-direction: column;
}

#viewer.active {
    display: flex;
}

#viewer-title {
    font-family: 'Tajawal', sans-serif;
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--text-color);
    margin: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    padding-left: 1rem;
    line-height: 1.3;
    grid-column: 1;
}

.viewer-header {
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--glass-border);
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    background: rgba(248, 250, 252, 0.9);
    gap: 1rem;
}

.close-btn {
    background: rgba(0, 0, 0, 0.05);
    border: none;
    color: var(--text-color);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    font-size: 2rem;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    grid-column: 3;
    justify-self: end;
}

.close-btn:hover {
    background: #ef4444;
}

.viewer-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    /* Tabs on top, content below */
    overflow: hidden;
}

.viewer-tabs {
    width: 100%;
    border-bottom: 1px solid var(--glass-border);
    padding: 1rem 1.5rem;
    background: #ffffff;
    /* Solid white background for tabs */
    display: flex;
    justify-content: center;
    /* Center tabs */
    overflow-x: auto;
    white-space: nowrap;
    gap: 0.8rem;
    /* Increased gap */
    grid-column: 2;
    width: 100%;
    border-bottom: none;
    background: transparent;
}

.viewer-tabs::-webkit-scrollbar {
    height: 4px;
}

.viewer-tabs::-webkit-scrollbar-thumb {
    background: var(--accent-color);
    border-radius: 2px;
}

.tab-btn {
    display: inline-block;
    width: auto;
    padding: 0.5rem 1rem;
    text-align: center;
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-dim);
    font-size: 1.1rem;
    /* Larger font */
    cursor: pointer;
    border-radius: 8px;
    /* Softer corners */
    margin-bottom: 0;
    font-weight: 700;
    /* Bold */
    font-family: 'Tajawal', sans-serif;
    /* Explicit premium font */
    letter-spacing: 0.5px;
    transition: all 0.2s ease;
}

.tab-btn:hover {
    background: rgba(0, 0, 0, 0.1);
    color: var(--text-color);
}

.tab-btn.active {
    background: var(--accent-color);
    border-color: transparent;
    color: var(--text-color);
    font-weight: bold;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.tab-content {
    flex: 1;
    padding: 0;
    overflow-y: hidden;
    display: flex;
    flex-direction: column;
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        align-items: stretch;
    }

    #filter-container {
        flex-direction: column;
    }

    .viewer-content {
        flex-direction: column;
    }

    .viewer-tabs {
        width: 100%;
        border-left: none;
        border-bottom: 1px solid var(--glass-border);
        display: flex;
        gap: 0.5rem;
        gap: 0.5rem;
        overflow-x: auto;
        padding: 0.5rem;
        justify-content: flex-start;
        /* Align start for scrolling */
    }

    .tab-btn {
        width: auto;
        white-space: nowrap;
        margin: 0;
        padding: 0.4rem 0.8rem;
        font-size: 0.95rem;
    }

    .card {
        padding: 1.5rem;
        min-height: 120px;
    }

    .card h3 {
        font-size: 1.1rem;
    }
}

/* Global Back Button */
.back-btn-global {
    background: rgba(56, 189, 248, 0.2);
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    font-family: 'Tajawal', sans-serif;
    font-weight: bold;
    margin-left: 1rem;
    display: none;
    /* Controlled by JS */
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
}

.back-btn-global:hover {
    background: var(--accent-color);
    color: var(--text-color);
    transform: translateX(-3px);
}

/* Semester Toggle Boxes */
.toggle-container {
    display: flex;
    gap: 0.5rem;
    background: rgba(0, 0, 0, 0.05);
    padding: 0.25rem;
    border-radius: 8px;
    border: 1px solid var(--glass-border);
}

/* Shared Toggle Box Styles */
.semester-box,
.grade-box {
    padding: 0.5rem 1rem;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 6px;
    color: var(--text-dim);
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.semester-box:hover,
.grade-box:hover {
    background: rgba(0, 0, 0, 0.1);
    color: var(--text-color);
}

.semester-box.active,
.grade-box.active {
    background: var(--accent-color);
    color: var(--text-color);
    font-weight: bold;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* New Grade Row Layout */
.grade-filter-row {
    width: 100%;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    gap: 1rem;
    padding-left: 2rem;
    padding-right: 2rem;
}

.grade-filter-row label {
    font-weight: bold;
    color: var(--accent-color);
    white-space: nowrap;
}

.scrollable-container {
    flex: 1;
    overflow-x: auto;
    padding-bottom: 5px;
    display: flex;
    gap: 0.5rem;
}

/* Custom Scrollbar */
.scrollable-container::-webkit-scrollbar {
    height: 4px;
}

.scrollable-container::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.05);
}

.scrollable-container::-webkit-scrollbar-thumb {
    background: var(--accent-color);
    border-radius: 2px;
}

/* Adjust header to allow height expansion */
header {
    height: auto;
    min-height: 80px;
    padding-bottom: 1rem;
    flex-direction: column;

    /* Pagination Styles for Multi-File Viewer */
    .pagination-container {
        display: flex;
        justify-content: center;
        gap: 0.8rem;
        padding: 1rem;
        margin-top: auto;
        background: rgba(248, 250, 252, 0.95);
        border-top: 1px solid var(--glass-border);
        z-index: 10;
        min-height: 60px;
        z-index: 10;
        min-height: 60px;
        width: 100%;
    }

    .pagination-dot {
        width: 30px;
        height: 30px;
        border-radius: 50%;
        background: rgba(0, 0, 0, 0.1);
        color: var(--text-dim);
        display: flex;
        justify-content: center;
        align-items: center;
        cursor: pointer;
        font-size: 0.9rem;
        transition: all 0.2s ease;
        border: 1px solid transparent;
    }

    .pagination-dot:hover {
        background: rgba(0, 0, 0, 0.2);
        color: var(--text-color);
    }

    .pagination-dot.active {
        background: var(--accent-color);
        color: var(--text-color);
        font-weight: bold;
        box-shadow: 0 0 10px rgba(56, 189, 248, 0.3);
    }