/* CSS Variables and Theme Styles */
:root {
    --bg-app: #f1f5f9;
    --bg-card: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #cbd5e1;
    --accent-blue: #0284c7;
    --accent-blue-hover: #0369a1;
    --accent-blue-light: #e0f2fe;
    
    --bit-zero-bg: #e2e8f0;
    --bit-zero-text: #475569;
    --bit-one-bg: #0284c7;
    --bit-one-text: #ffffff;
    
    --sidebar-bg: #ffffff;
    --sidebar-border: #e2e8f0;
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --card-shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.08);
}

[data-bs-theme="dark"] {
    --bg-app: #0f172a;
    --bg-card: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --border-color: #334155;
    --accent-blue: #38bdf8;
    --accent-blue-hover: #7dd3fc;
    --accent-blue-light: #0c4a6e;
    
    --bit-zero-bg: #334155;
    --bit-zero-text: #94a3b8;
    --bit-one-bg: #0284c7;
    --bit-one-text: #ffffff;
    
    --sidebar-bg: #1e293b;
    --sidebar-border: #334155;
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.2), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
    --card-shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
}

body {
    background-color: var(--bg-app) !important;
    color: var(--text-primary) !important;
    font-family: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.card {
    background-color: var(--bg-card) !important;
    border: 1px solid var(--border-color) !important;
    box-shadow: var(--card-shadow);
    border-radius: 12px !important;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.3s, border-color 0.3s;
}

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

/* Header & Navbar Styling */
.navbar {
    background-color: var(--bg-card) !important;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
    transition: background-color 0.3s, border-color 0.3s;
}

.navbar-brand {
    font-weight: 700;
    color: var(--accent-blue) !important;
}

.nav-link {
    font-weight: 500;
    color: var(--text-secondary) !important;
    transition: color 0.2s ease;
}

.nav-link:hover, .nav-link.active {
    color: var(--accent-blue) !important;
}

/* Bit boxes styling */
.bit-grid {
    display: flex;
    gap: 8px;
    margin-top: 8px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.bit-box {
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.15rem;
    font-weight: 700;
    border-radius: 8px;
    cursor: pointer;
    user-select: none;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid var(--border-color);
}

.bit-box:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(2, 132, 199, 0.2);
}

.bit-box.bit-zero {
    background-color: var(--bit-zero-bg);
    color: var(--bit-zero-text);
}

.bit-box.bit-one {
    background-color: var(--bit-one-bg);
    color: var(--bit-one-text);
    border-color: var(--accent-blue);
}

/* Static representation of bits in accordion/steps */
.bit-badge-container {
    display: flex;
    gap: 4px;
    align-items: center;
    margin-bottom: 8px;
}

.bit-badge {
    width: 28px;
    height: 28px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    border-radius: 4px;
    font-size: 0.85rem;
    border: 1px solid var(--border-color);
}

.bit-badge.zero {
    background-color: var(--bit-zero-bg);
    color: var(--bit-zero-text);
}

.bit-badge.one {
    background-color: var(--bit-one-bg);
    color: var(--bit-one-text);
}

/* Sidebar navigation styling */
.step-navigator {
    position: sticky;
    top: 90px;
    z-index: 10;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 15px;
    box-shadow: var(--card-shadow);
    max-height: calc(100vh - 120px);
    overflow-y: auto;
}

.navigator-item {
    display: flex;
    align-items: center;
    padding: 10px 12px;
    margin-bottom: 6px;
    border-radius: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: all 0.2s ease;
    border-left: 3px solid transparent;
}

.navigator-item:hover {
    background-color: var(--bg-app);
    color: var(--accent-blue);
}

.navigator-item.active {
    background-color: var(--accent-blue-light);
    color: var(--accent-blue);
    border-left-color: var(--accent-blue);
    font-weight: 600;
}

/* Accordion Step styling */
.step-header-btn {
    text-align: left;
    width: 100%;
    background: none;
    border: none;
    padding: 15px 20px;
    font-weight: 600;
    font-size: 1.05rem;
    color: var(--text-primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.2s;
}

.step-header-btn:hover {
    background-color: var(--accent-blue-light);
}

.step-header-btn:focus {
    outline: none;
}

.step-number-badge {
    background-color: var(--accent-blue);
    color: white;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-right: 12px;
    font-size: 0.85rem;
    font-weight: bold;
}

/* Sbox highlighting styles */
.sbox-table {
    border-collapse: collapse;
    width: 100%;
    margin-top: 10px;
}

.sbox-table th, .sbox-table td {
    border: 1px solid var(--border-color);
    padding: 10px;
    text-align: center;
    font-weight: 600;
    font-size: 0.95rem;
}

.sbox-table th {
    background-color: var(--bg-app);
    color: var(--text-secondary);
}

.sbox-table td.highlight-row {
    background-color: rgba(2, 132, 199, 0.1);
}

.sbox-table td.highlight-col {
    background-color: rgba(2, 132, 199, 0.1);
}

.sbox-table td.highlight-cell {
    background-color: #0284c7 !important;
    color: #ffffff !important;
    box-shadow: 0 0 10px rgba(2, 132, 199, 0.5);
    transform: scale(1.05);
    z-index: 2;
}

/* Learning Mode dynamic view */
.learning-detail {
    display: block;
    margin-top: 10px;
    padding: 10px 15px;
    border-left: 3px solid var(--accent-blue);
    background-color: var(--bg-app);
    border-radius: 0 8px 8px 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: all 0.3s ease;
}

.learning-mode-disabled .learning-detail {
    display: none !important;
}

/* Student Notes area */
.notes-textarea {
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.85rem;
    background-color: var(--bg-app) !important;
    color: var(--text-primary) !important;
    border: 1px solid var(--border-color) !important;
    border-radius: 8px;
    padding: 15px;
    resize: none;
    line-height: 1.4;
}

/* Formulas rendering */
.math-formula {
    font-family: 'Cambria Math', 'New Times Roman', serif;
    font-style: italic;
    font-size: 1.15rem;
    padding: 10px;
    background-color: var(--bg-app);
    border-radius: 8px;
    text-align: center;
    margin: 10px 0;
    color: var(--accent-blue);
    border: 1px dashed var(--border-color);
}

/* General Permutation Table styling */
.permutation-table {
    margin-bottom: 12px;
    width: 100%;
}

.permutation-table td {
    padding: 6px 10px;
    font-size: 0.85rem;
    border: 1px solid var(--border-color);
    text-align: center;
}

.permutation-table tr:first-child td {
    background-color: var(--bg-app);
    font-weight: bold;
    color: var(--text-secondary);
}

/* Floating back to top button */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    background-color: var(--accent-blue);
    color: white !important;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
    border: none;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background-color: var(--accent-blue-hover);
    transform: translateY(-3px);
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.25);
}

/* Custom Alert classes */
.alert-primary {
    background-color: var(--accent-blue-light) !important;
    border-color: var(--border-color) !important;
    color: var(--text-primary) !important;
}

/* Tooltip custom styled */
.tooltip-inner {
    background-color: var(--bg-card) !important;
    color: var(--text-primary) !important;
    border: 1px solid var(--border-color) !important;
    box-shadow: var(--card-shadow);
}

/* Print Specific adjustments */
@media print {
    .step-navigator, .navbar, .back-to-top, .button-group, .btn, form {
        display: none !important;
    }
    body {
        background-color: white !important;
        color: black !important;
    }
    .card {
        border: none !important;
        box-shadow: none !important;
    }
    .accordion-collapse {
        display: block !important;
    }
}