/* ==========================================================================
   PORTAL PEMBELAJARAN INFORMATIKA — MTs ELL FIRDAUS 1 SIDAREJA
   Design System: Bueko Ultra-Responsive Style Edition
   ========================================================================== */

:root {
    --bg-main: #0b0f19;
    --bg-card: #131b2e;
    --bg-card-hover: #1c2742;
    --border-color: #233152;
    --primary: #10b981;
    --primary-glow: rgba(16, 185, 129, 0.25);
    --accent: #3b82f6;
    --text-main: #f3f4f6;
    --text-muted: #9ca3af;
    --text-heading: #ffffff;
    --sidebar-width: 310px;
    --font-main: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-code: 'Fira Code', 'Courier New', monospace;
}

body.light-mode {
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --bg-card-hover: #f1f5f9;
    --border-color: #e2e8f0;
    --primary: #059669;
    --primary-glow: rgba(5, 150, 105, 0.15);
    --accent: #2563eb;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --text-heading: #0f172a;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

html {
    scroll-behavior: smooth;
    width: 100%;
    max-width: 100%;
    overflow-x: hidden;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
    width: 100%;
    max-width: 100%;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
    padding-bottom: 74px; /* Space for mobile bottom nav */
}

@media (min-width: 992px) {
    body {
        padding-bottom: 2rem;
    }
}

/* ==========================================================================
   Header & Navbar
   ========================================================================== */
#reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, #10b981, #3b82f6);
    width: 0%;
    z-index: 9999;
    transition: width 0.1s ease-out;
}

header {
    background: rgba(19, 27, 46, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

body.light-mode header {
    background: rgba(255, 255, 255, 0.88);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0.6rem 0.85rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
}

.brand-info {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    text-decoration: none;
    color: inherit;
}

.brand-logo {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    font-size: 1.15rem;
    box-shadow: 0 4px 12px var(--primary-glow);
    flex-shrink: 0;
}

.brand-title h1 {
    font-size: 0.98rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--text-heading);
    line-height: 1.2;
}

.brand-title p {
    font-size: 0.68rem;
    color: var(--text-muted);
    font-weight: 500;
    line-height: 1.2;
}

/* Nav Controls */
.desktop-nav-controls {
    display: none;
    align-items: center;
    gap: 0.5rem;
}

@media (min-width: 992px) {
    .desktop-nav-controls {
        display: flex;
    }
}

.nav-tab-btn {
    padding: 0.45rem 0.85rem;
    border-radius: 8px;
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    white-space: nowrap;
    text-decoration: none;
    transition: all 0.2s ease;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    color: var(--text-main);
}

.nav-tab-btn:hover:not(.active) {
    background: var(--bg-card-hover);
    border-color: var(--primary);
}

.nav-tab-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #ffffff;
    box-shadow: 0 0 16px var(--primary-glow);
}

.icon-btn {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    width: 36px;
    height: 36px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all 0.2s ease;
    text-decoration: none;
}

.icon-btn:hover {
    background: var(--bg-card-hover);
    color: var(--primary);
    border-color: var(--primary);
}

.mobile-header-actions {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

@media (min-width: 992px) {
    .mobile-header-actions {
        display: none;
    }
}

/* ==========================================================================
   Sub-Header Horizontal Selector (Sticky Pills Bar)
   ========================================================================== */
.sub-header-bar {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    padding: 0.55rem 0.75rem;
    position: sticky;
    top: 53px;
    z-index: 90;
    transition: background-color 0.3s ease;
}

.sub-header-inner {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    overflow-x: auto;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
}

.sub-header-inner::-webkit-scrollbar {
    display: none;
}

.pills-group {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    flex-shrink: 0;
}

.pill-btn {
    padding: 0.35rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    text-decoration: none;
    white-space: nowrap;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    background: var(--bg-main);
    transition: all 0.2s ease;
}

.pill-btn:hover:not(.active) {
    color: var(--text-main);
    border-color: var(--primary);
}

.pill-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #ffffff;
    box-shadow: 0 2px 8px var(--primary-glow);
}

/* Period Segmented Switcher */
.period-group {
    background: rgba(15, 23, 42, 0.45);
    border: 1px solid var(--border-color);
    padding: 3px;
    border-radius: 24px;
    display: inline-flex;
    align-items: center;
    gap: 3px;
    flex-shrink: 0;
}

body.light-mode .period-group {
    background: rgba(226, 232, 240, 0.75);
}

.period-pill {
    padding: 0.28rem 0.7rem;
    border-radius: 18px;
    font-size: 0.72rem;
    font-weight: 700;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    color: var(--text-muted);
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

.period-pill:hover {
    color: var(--text-main);
}

.period-pill.active-asas {
    background: linear-gradient(135deg, #059669, #10b981);
    color: #ffffff !important;
    box-shadow: 0 2px 8px rgba(16, 185, 129, 0.35);
}

.period-pill.active-asts {
    background: linear-gradient(135deg, #d97706, #f59e0b);
    color: #ffffff !important;
    box-shadow: 0 2px 8px rgba(245, 158, 11, 0.35);
}

.badge-period-asas {
    background: rgba(16, 185, 129, 0.15);
    color: #10b981;
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge-period-asts {
    background: rgba(245, 158, 11, 0.15);
    color: #f59e0b;
    border: 1px solid rgba(245, 158, 11, 0.3);
}

/* ==========================================================================
   Layout Grid & Content Cards
   ========================================================================== */
.main-layout {
    width: 100%;
    max-width: 1400px;
    margin: 0.75rem auto;
    padding: 0 0.65rem;
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.25rem;
    min-width: 0;
    box-sizing: border-box;
}

@media (min-width: 992px) {
    .main-layout {
        grid-template-columns: var(--sidebar-width) 1fr;
        padding: 0 1.25rem;
        margin: 1.5rem auto;
    }
}

.content-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 1.15rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    width: 100%;
    min-width: 0;
    max-width: 100%;
    box-sizing: border-box;
    overflow-x: hidden;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

@media (min-width: 768px) {
    .content-card {
        padding: 2rem;
    }
}

/* Document Toolbar */
.doc-toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding-bottom: 1rem;
    margin-bottom: 1.25rem;
    border-bottom: 1px solid var(--border-color);
}

.doc-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.45rem;
}

.badge {
    font-size: 0.72rem;
    font-weight: 700;
    padding: 0.25rem 0.65rem;
    border-radius: 6px;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

.badge-grade {
    background: var(--primary-glow);
    color: var(--primary);
    border: 1px solid var(--primary);
}

.badge-type {
    background: rgba(59, 130, 246, 0.15);
    color: var(--accent);
    border: 1px solid rgba(59, 130, 246, 0.3);
}

.doc-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.45rem;
}

.btn-action {
    padding: 0.35rem 0.75rem;
    border-radius: 8px;
    font-size: 0.76rem;
    font-weight: 700;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    text-decoration: none;
    transition: all 0.2s ease;
    border: 1px solid var(--border-color);
    background: var(--bg-card-hover);
    color: var(--text-main);
}

.btn-action:hover {
    border-color: var(--primary);
    transform: translateY(-1px);
}

.btn-download-word {
    background: linear-gradient(135deg, #1d4ed8, #2563eb);
    color: #ffffff !important;
    border: none;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

.btn-download-word:hover {
    background: linear-gradient(135deg, #1e40af, #1d4ed8);
}

.btn-download-mgmp {
    background: linear-gradient(135deg, #059669, #10b981);
    color: #ffffff !important;
    border: none;
    box-shadow: 0 2px 8px rgba(16, 185, 129, 0.3);
}

.btn-download-mgmp:hover {
    background: linear-gradient(135deg, #047857, #059669);
    transform: translateY(-1px);
}

/* Search Box & Counters */
.search-box {
    position: relative;
    width: 100%;
}

.search-box i.fa-search {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 0.8rem;
}

.search-box input {
    width: 100%;
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 0.5rem 2rem 0.5rem 2.2rem;
    border-radius: 8px;
    font-size: 0.8rem;
    font-family: inherit;
    transition: all 0.2s ease;
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

.search-clear-btn {
    position: absolute;
    right: 0.5rem;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    display: none;
}

#search-counter-bar {
    display: none;
    background: var(--primary-glow);
    border: 1px solid var(--primary);
    color: var(--text-heading);
    padding: 0.45rem 0.85rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    font-size: 0.8rem;
    align-items: center;
    justify-content: space-between;
}

/* ==========================================================================
   Sidebar Cards & Nav Lists
   ========================================================================== */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

@media (max-width: 991px) {
    .sidebar {
        display: none;
    }
}

.sidebar-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
}

.sidebar-card h3 {
    font-size: 0.82rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    margin-bottom: 0.65rem;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.menu-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.menu-item-link {
    padding: 0.45rem 0.75rem;
    border-radius: 8px;
    font-size: 0.8rem;
    font-weight: 600;
    text-decoration: none;
    color: var(--text-main);
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

.menu-item-link:hover {
    background: var(--bg-card-hover);
    color: var(--primary);
}

.menu-item-link.active {
    background: var(--primary-glow);
    border-color: var(--primary);
    color: var(--primary);
    font-weight: 700;
}

/* ==========================================================================
   Markdown Body Typography & Content Rendering
   ========================================================================== */
.markdown-body {
    font-size: 0.95rem;
    line-height: 1.75;
    color: var(--text-main);
    width: 100%;
    min-width: 0;
    max-width: 100%;
    overflow-wrap: break-word;
    word-break: break-word;
    box-sizing: border-box;
}

.markdown-body h1 {
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--text-heading);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.45rem;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    text-align: center;
}

.markdown-body h2 {
    font-size: 1.18rem;
    font-weight: 800;
    color: var(--primary);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.35rem;
    margin-top: 1.35rem;
    margin-bottom: 0.65rem;
    text-align: center;
}

.markdown-body h3 {
    font-size: 1.02rem;
    font-weight: 700;
    color: var(--primary);
    background: var(--primary-glow);
    padding: 0.45rem 0.85rem;
    border-radius: 8px;
    border-left: 4px solid var(--primary);
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    scroll-margin-top: 110px;
}

.markdown-body h4 {
    font-size: 0.94rem;
    font-weight: 700;
    color: var(--text-heading);
    margin-top: 1rem;
    margin-bottom: 0.45rem;
}

.markdown-body p {
    margin-bottom: 0.85rem;
    text-align: justify;
}

.markdown-body ul, .markdown-body ol {
    margin-left: 1.25rem;
    margin-bottom: 0.85rem;
}

.markdown-body li {
    margin-bottom: 0.35rem;
}

.markdown-body blockquote {
    background: var(--primary-glow);
    border-left: 4px solid var(--primary);
    padding: 0.75rem 1rem;
    border-radius: 0 10px 10px 0;
    margin: 1rem 0;
    color: var(--text-main);
    font-size: 0.88rem;
}

/* Responsive Table */
.table-responsive {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin: 1.2rem 0;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.markdown-body table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.84rem;
    white-space: normal;
}

.markdown-body th, .markdown-body td {
    padding: 0.65rem 0.85rem;
    border-bottom: 1px solid var(--border-color);
    text-align: left;
    vertical-align: top;
}

.markdown-body th {
    background: var(--bg-card-hover);
    color: var(--primary);
    font-weight: 800;
    text-transform: uppercase;
    font-size: 0.76rem;
    letter-spacing: 0.03em;
    border-bottom: 2px solid var(--border-color);
}

.markdown-body tr:nth-child(even) td {
    background: rgba(255, 255, 255, 0.015);
}

body.light-mode .markdown-body tr:nth-child(even) td {
    background: rgba(0, 0, 0, 0.025);
}

.markdown-body tr:hover td {
    background: var(--primary-glow);
}

/* Code & Pre */
.markdown-body code {
    font-family: var(--font-code);
    background: var(--bg-main);
    color: var(--primary);
    padding: 0.12rem 0.4rem;
    border-radius: 5px;
    font-size: 0.88em;
    border: 1px solid var(--border-color);
}

/* ==========================================================================
   Code Snippet Box ("Canvas Rumus & Kode yang Bisa Disalin")
   ========================================================================== */
.code-box-container {
    background: #090e1a;
    border: 1px solid rgba(56, 189, 248, 0.25);
    border-radius: 10px;
    margin: 0.85rem 0 1.15rem;
    overflow: hidden;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
    transition: all 0.25s ease;
}

.code-box-container:hover {
    border-color: rgba(56, 189, 248, 0.5);
    box-shadow: 0 6px 22px rgba(0, 0, 0, 0.35);
}

.code-box-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.4rem 0.85rem;
    background: #0f172a;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.code-box-meta {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    font-size: 0.74rem;
    font-weight: 700;
    letter-spacing: 0.03em;
    color: #38bdf8;
    text-transform: uppercase;
}

.code-box-meta i {
    font-size: 0.82rem;
    color: #10b981;
}

.code-copy-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.22rem 0.65rem;
    font-size: 0.72rem;
    font-weight: 600;
    color: #cbd5e1;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.code-copy-btn:hover {
    background: rgba(16, 185, 129, 0.2);
    border-color: #10b981;
    color: #34d399;
    transform: translateY(-1px);
}

.code-copy-btn.copied {
    background: rgba(16, 185, 129, 0.25);
    border-color: #10b981;
    color: #10b981;
}

.code-box-container pre {
    margin: 0 !important;
    padding: 0.75rem 1rem !important;
    background: transparent !important;
    border: none !important;
    border-radius: 0 !important;
    overflow-x: auto;
    line-height: 1.45;
}

.code-box-container pre code {
    font-family: var(--font-code);
    font-size: 0.88rem;
    font-weight: 500;
    color: #38bdf8 !important;
    background: transparent !important;
    border: none !important;
    padding: 0 !important;
    display: block;
    white-space: pre;
}

/* Light Mode Overrides */
body.light-mode .code-box-container {
    background: #f8fafc;
    border-color: #cbd5e1;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
}

body.light-mode .code-box-header {
    background: #e2e8f0;
    border-bottom: 1px solid #cbd5e1;
}

body.light-mode .code-box-meta {
    color: #0369a1;
}

body.light-mode .code-copy-btn {
    background: #ffffff;
    border-color: #cbd5e1;
    color: #475569;
}

body.light-mode .code-copy-btn:hover {
    background: rgba(16, 185, 129, 0.12);
    border-color: #059669;
    color: #059669;
}

body.light-mode .code-box-container pre code {
    color: #0369a1 !important;
}

.markdown-body pre {
    background: #090e1a;
    color: #f3f4f6;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 0.85rem 0;
    border: 1px solid var(--border-color);
}

.markdown-body pre code {
    background: transparent !important;
    border: none;
    padding: 0;
    color: #38bdf8;
}

/* KaTeX Math Responsive Display */
.markdown-body .katex-display {
    max-width: 100% !important;
    overflow-x: auto !important;
    overflow-y: hidden !important;
    -webkit-overflow-scrolling: touch !important;
    padding: 0.5rem 0.25rem !important;
    margin: 0.75rem 0 !important;
}

.markdown-body .katex {
    max-width: 100% !important;
}

.markdown-body .katex-html {
    max-width: 100% !important;
    overflow-x: auto !important;
    overflow-y: hidden !important;
}

.markdown-body hr {
    border: 0;
    height: 1px;
    background: var(--border-color);
    margin: 1.5rem 0;
}

/* ==========================================================================
   Portal Hub Landing Page Components (index.html)
   ========================================================================== */
.portal-hero {
    text-align: center;
    padding: 2.5rem 1rem 2rem;
    max-width: 900px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.35rem 0.95rem;
    border-radius: 30px;
    font-size: 0.75rem;
    font-weight: 700;
    background: var(--primary-glow);
    border: 1px solid var(--primary);
    color: var(--primary);
    margin-bottom: 1rem;
}

.hero-title {
    font-size: 1.85rem;
    font-weight: 800;
    color: var(--text-heading);
    line-height: 1.25;
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
}

@media (min-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
}

.hero-subtitle {
    font-size: 0.95rem;
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto 1.5rem;
}

/* Assessment Cards Grid */
.period-cards-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    max-width: 1200px;
    margin: 1rem auto 2.5rem;
    padding: 0 1rem;
}

@media (min-width: 860px) {
    .period-cards-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.period-hero-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.75rem;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
}

.period-hero-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 36px rgba(0, 0, 0, 0.3);
}

.period-hero-card.card-active {
    border-color: rgba(16, 185, 129, 0.4);
}

.period-hero-card.card-active::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #10b981, #3b82f6);
}

.period-hero-card.card-archive {
    border-color: rgba(245, 158, 11, 0.4);
}

.period-hero-card.card-archive::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #f59e0b, #d97706);
}

.card-top-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.card-period-tag {
    font-size: 0.72rem;
    font-weight: 800;
    padding: 0.25rem 0.65rem;
    border-radius: 20px;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

.card-period-title {
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--text-heading);
    margin-bottom: 0.45rem;
}

.card-period-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 1.25rem;
    line-height: 1.5;
}

.card-feature-list {
    list-style: none;
    margin-bottom: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.card-feature-item {
    font-size: 0.82rem;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.card-feature-item i {
    font-size: 0.75rem;
}

/* Grade Quick Action Buttons in Cards */
.grade-actions-box {
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem;
    margin-bottom: 1.25rem;
}

.grade-actions-box p {
    font-size: 0.72rem;
    font-weight: 800;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 0.65rem;
}

.grade-btn-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
}

.grade-pill-btn {
    padding: 0.5rem 0.4rem;
    border-radius: 8px;
    font-size: 0.75rem;
    font-weight: 700;
    text-decoration: none;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.2rem;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    color: var(--text-main);
    transition: all 0.2s ease;
}

.grade-pill-btn:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.card-main-cta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.75rem 1rem;
    border-radius: 10px;
    font-size: 0.85rem;
    font-weight: 800;
    text-decoration: none;
    color: #ffffff;
    transition: all 0.2s ease;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.2);
}

.cta-asas {
    background: linear-gradient(135deg, #059669, #10b981);
}

.cta-asas:hover {
    background: linear-gradient(135deg, #047857, #059669);
    transform: translateY(-2px);
}

.cta-asts {
    background: linear-gradient(135deg, #d97706, #f59e0b);
}

.cta-asts:hover {
    background: linear-gradient(135deg, #b45309, #d97706);
    transform: translateY(-2px);
}

/* Stats Counter Row */
.stats-banner {
    max-width: 1200px;
    margin: 0 auto 2.5rem;
    padding: 0 1rem;
}

.stats-grid {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    padding: 1.25rem 0.5rem;
    gap: 1rem;
}

@media (min-width: 768px) {
    .stats-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.stat-item {
    text-align: center;
    padding: 0.5rem;
    border-right: 1px solid var(--border-color);
}

.stat-item:last-child {
    border-right: none;
}

.stat-number {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1.2;
}

.stat-label {
    font-size: 0.72rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
}

/* ==========================================================================
   Modals, Floating Actions & Toast
   ========================================================================== */
.fab-container {
    position: fixed;
    bottom: 76px;
    right: 14px;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    z-index: 95;
}

@media (min-width: 992px) {
    .fab-container {
        bottom: 24px;
        right: 24px;
    }
}

.fab-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.3);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    transition: all 0.2s ease;
}

.fab-btn:hover {
    transform: translateY(-2px);
    border-color: var(--primary);
}

#back-to-top {
    display: none;
}

/* Mobile Offcanvas Drawer */
.mobile-drawer-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(4px);
    z-index: 200;
    display: none;
}

.mobile-drawer {
    position: fixed;
    top: 0;
    left: -320px;
    width: 290px;
    height: 100%;
    background: var(--bg-card);
    border-right: 1px solid var(--border-color);
    z-index: 201;
    display: flex;
    flex-direction: column;
    padding: 1.15rem;
    overflow-y: auto;
    transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.mobile-drawer.open {
    left: 0;
}

.drawer-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 0.85rem;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

/* Quick TOC Modal */
.toc-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(4px);
    z-index: 200;
    display: none;
    align-items: flex-end;
    justify-content: center;
}

@media (min-width: 768px) {
    .toc-modal-overlay {
        align-items: center;
    }
}

.toc-modal {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px 16px 0 0;
    width: 100%;
    max-width: 600px;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    padding: 1.25rem;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.3);
}

@media (min-width: 768px) {
    .toc-modal {
        border-radius: 16px;
    }
}

.toc-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.toc-list {
    list-style: none;
    overflow-y: auto;
    padding-top: 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.toc-list a {
    padding: 0.45rem 0.75rem;
    border-radius: 8px;
    font-size: 0.82rem;
    color: var(--text-main);
    text-decoration: none;
    display: block;
    transition: all 0.2s ease;
}

.toc-list a:hover {
    background: var(--primary-glow);
    color: var(--primary);
}

/* Mobile Bottom Navigation */
.mobile-bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: rgba(19, 27, 46, 0.95);
    backdrop-filter: blur(12px);
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-around;
    padding: 0 0.5rem;
    z-index: 100;
}

body.light-mode .mobile-bottom-nav {
    background: rgba(255, 255, 255, 0.95);
}

@media (min-width: 992px) {
    .mobile-bottom-nav {
        display: none;
    }
}

.mobile-nav-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: 0.65rem;
    font-weight: 700;
    gap: 0.15rem;
    cursor: pointer;
    padding: 0.25rem 0.4rem;
    border-radius: 8px;
    text-decoration: none;
    transition: all 0.2s ease;
    flex: 1;
}

.mobile-nav-btn i {
    font-size: 1.05rem;
}

.mobile-nav-btn.active {
    color: var(--primary);
}

body[data-page="asts"] .mobile-nav-btn.active {
    color: #f59e0b;
}

/* Toast */
.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    background: #064e3b;
    border: 1px solid #10b981;
    color: #ffffff;
    padding: 0.75rem 1.25rem;
    border-radius: 10px;
    font-size: 0.82rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
    z-index: 99999;
    opacity: 0;
    transform: translateY(-20px);
    pointer-events: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

/* ==========================================================================
   Print Styles
   ========================================================================== */
@media print {
    body {
        background: #ffffff !important;
        color: #000000 !important;
        font-size: 11pt !important;
        padding-bottom: 0 !important;
    }
    .no-print, header, .sub-header-bar, .sidebar, .doc-toolbar, .mobile-bottom-nav, .toast, #reading-progress, .fab-container, .mobile-drawer-overlay, .toc-modal-overlay {
        display: none !important;
    }
    .print-header {
        display: block !important;
        text-align: center;
        border-bottom: 2.5pt double #000000;
        padding-bottom: 8pt;
        margin-bottom: 14pt;
    }
    .main-layout {
        display: block !important;
        max-width: 100% !important;
        padding: 0 !important;
        margin: 0 !important;
    }
    .content-card {
        background: transparent !important;
        border: none !important;
        box-shadow: none !important;
        padding: 0 !important;
    }
    .markdown-body {
        color: #000000 !important;
    }
    .markdown-body h1, .markdown-body h2, .markdown-body h3 {
        color: #000000 !important;
        background: transparent !important;
        page-break-after: avoid;
    }
    .markdown-body table, .markdown-body pre {
        page-break-inside: avoid;
    }
}

/* ==========================================================================
   Portal Hub Landing Page Styles (index.html)
   ========================================================================== */
.portal-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.5rem 1rem 3rem;
}

@media (min-width: 768px) {
    .portal-container {
        padding: 2.5rem 1.5rem 4rem;
    }
}

.portal-hero {
    text-align: center;
    padding: 2.5rem 1rem 2rem;
    background: radial-gradient(circle at 50% 20%, rgba(16, 185, 129, 0.12) 0%, rgba(59, 130, 246, 0.05) 50%, transparent 80%);
    border-radius: 20px;
    border: 1px solid var(--border-color);
    margin-bottom: 2.5rem;
    position: relative;
    overflow: hidden;
}

.portal-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(16, 185, 129, 0.15);
    border: 1px solid var(--primary);
    color: var(--primary);
    padding: 0.35rem 0.95rem;
    border-radius: 30px;
    font-size: 0.78rem;
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: 0.02em;
}

.portal-hero h1 {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--text-heading);
    letter-spacing: -0.025em;
    line-height: 1.25;
    margin-bottom: 0.75rem;
}

@media (min-width: 768px) {
    .portal-hero h1 {
        font-size: 2.4rem;
    }
}

.portal-hero-gradient {
    background: linear-gradient(135deg, #10b981 0%, #3b82f6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.portal-hero p {
    color: var(--text-muted);
    font-size: 0.95rem;
    max-width: 680px;
    margin: 0 auto 1.5rem;
    line-height: 1.6;
}

.portal-period-cards {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin-bottom: 3rem;
}

@media (min-width: 768px) {
    .portal-period-cards {
        grid-template-columns: 1fr 1fr;
        gap: 1.75rem;
    }
}

.portal-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.75rem;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    overflow: hidden;
}

.portal-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
}

.portal-card.card-asas::before {
    background: linear-gradient(90deg, #10b981, #059669);
}

.portal-card.card-asts::before {
    background: linear-gradient(90deg, #f59e0b, #d97706);
}

.portal-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.25);
}

.portal-card.card-asts:hover {
    border-color: #f59e0b;
}

.portal-card-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.25rem;
}

.portal-card-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.35rem;
}

.card-asas .portal-card-icon {
    background: rgba(16, 185, 129, 0.15);
    color: #10b981;
}

.card-asts .portal-card-icon {
    background: rgba(245, 158, 11, 0.15);
    color: #f59e0b;
}

.portal-card h2 {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--text-heading);
    margin-bottom: 0.5rem;
}

.portal-card p.card-desc {
    color: var(--text-muted);
    font-size: 0.85rem;
    line-height: 1.55;
    margin-bottom: 1.25rem;
}

.card-class-pills {
    display: flex;
    gap: 0.45rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.class-pill-link {
    padding: 0.4rem 0.85rem;
    border-radius: 8px;
    font-size: 0.78rem;
    font-weight: 700;
    text-decoration: none;
    border: 1px solid var(--border-color);
    background: var(--bg-main);
    color: var(--text-main);
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    transition: all 0.2s ease;
}

.class-pill-link:hover {
    border-color: var(--primary);
    background: var(--primary-glow);
    color: var(--primary);
    transform: translateY(-1px);
}

.card-asts .class-pill-link:hover {
    border-color: #f59e0b;
    background: rgba(245, 158, 11, 0.12);
    color: #f59e0b;
}

.btn-portal-enter {
    width: 100%;
    padding: 0.8rem 1.25rem;
    border-radius: 10px;
    font-weight: 700;
    font-size: 0.9rem;
    text-decoration: none;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all 0.2s ease;
    border: none;
    cursor: pointer;
}

.btn-portal-asas {
    background: linear-gradient(135deg, #059669, #10b981);
    color: #ffffff !important;
    box-shadow: 0 4px 14px rgba(16, 185, 129, 0.35);
}

.btn-portal-asas:hover {
    background: linear-gradient(135deg, #047857, #059669);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.5);
    transform: translateY(-1px);
}

.btn-portal-asts {
    background: linear-gradient(135deg, #d97706, #f59e0b);
    color: #ffffff !important;
    box-shadow: 0 4px 14px rgba(245, 158, 11, 0.35);
}

.btn-portal-asts:hover {
    background: linear-gradient(135deg, #b45309, #d97706);
    box-shadow: 0 6px 20px rgba(245, 158, 11, 0.5);
    transform: translateY(-1px);
}

/* Feature grid */
.portal-section-title {
    font-size: 1.15rem;
    font-weight: 800;
    color: var(--text-heading);
    margin-bottom: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.portal-features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    margin-bottom: 3rem;
}

@media (min-width: 640px) {
    .portal-features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .portal-features-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.feature-box {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem;
    transition: all 0.2s ease;
}

.feature-box:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
}

.feature-box-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: var(--primary-glow);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    margin-bottom: 0.85rem;
}

.feature-box h3 {
    font-size: 0.92rem;
    font-weight: 700;
    color: var(--text-heading);
    margin-bottom: 0.35rem;
}

.feature-box p {
    font-size: 0.78rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* Footer */
.portal-footer {
    text-align: center;
    padding: 2rem 1rem 1rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.8rem;
}

.portal-footer a {
    color: var(--primary);
    text-decoration: none;
}

.portal-footer a:hover {
    text-decoration: underline;
}