/* ========================================================
   POS Wiki — Design System & Styles
   ======================================================== */

/* --- CSS Custom Properties --- */
:root {
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --sidebar-width: 280px;
    --topbar-height: 56px;
    --toc-width: 220px;
    --content-max-width: 780px;
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 20px;
}

/* --- Dark Theme (Default) --- */
[data-theme="dark"] {
    --bg-primary: #0f1117;
    --bg-secondary: #161922;
    --bg-tertiary: #1c2030;
    --bg-elevated: #222639;
    --bg-sidebar: rgba(15, 17, 23, 0.85);
    --bg-hover: rgba(255, 255, 255, 0.05);
    --bg-active: rgba(251, 191, 36, 0.1);
    --text-primary: #e8eaed;
    --text-secondary: #9aa0af;
    --text-tertiary: #6b7280;
    --text-accent: #fbbf24;
    --text-link: #60a5fa;
    --border-primary: rgba(255, 255, 255, 0.08);
    --border-secondary: rgba(255, 255, 255, 0.04);
    --border-active: rgba(251, 191, 36, 0.3);
    --accent-primary: #fbbf24;
    --accent-secondary: #f59e0b;
    --accent-glow: rgba(251, 191, 36, 0.15);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --callout-info-bg: rgba(59, 130, 246, 0.1);
    --callout-info-border: rgba(59, 130, 246, 0.3);
    --callout-info-text: #93c5fd;
    --callout-warn-bg: rgba(245, 158, 11, 0.1);
    --callout-warn-border: rgba(245, 158, 11, 0.3);
    --callout-warn-text: #fcd34d;
    --callout-tip-bg: rgba(34, 197, 94, 0.1);
    --callout-tip-border: rgba(34, 197, 94, 0.3);
    --callout-tip-text: #86efac;
    --callout-danger-bg: rgba(239, 68, 68, 0.1);
    --callout-danger-border: rgba(239, 68, 68, 0.3);
    --callout-danger-text: #fca5a5;
    --code-bg: #1a1e2e;
    --code-text: #e2e8f0;
    --code-inline-bg: rgba(251, 191, 36, 0.1);
    --code-inline-text: #fbbf24;
    --scrollbar-track: transparent;
    --scrollbar-thumb: rgba(255, 255, 255, 0.12);
    --scrollbar-thumb-hover: rgba(255, 255, 255, 0.2);
}

/* --- Light Theme --- */
[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fb;
    --bg-tertiary: #f0f2f5;
    --bg-elevated: #ffffff;
    --bg-sidebar: rgba(248, 249, 251, 0.92);
    --bg-hover: rgba(0, 0, 0, 0.04);
    --bg-active: rgba(217, 119, 6, 0.08);
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-tertiary: #9ca3af;
    --text-accent: #d97706;
    --text-link: #2563eb;
    --border-primary: rgba(0, 0, 0, 0.1);
    --border-secondary: rgba(0, 0, 0, 0.05);
    --border-active: rgba(217, 119, 6, 0.4);
    --accent-primary: #d97706;
    --accent-secondary: #b45309;
    --accent-glow: rgba(217, 119, 6, 0.1);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --callout-info-bg: rgba(59, 130, 246, 0.06);
    --callout-info-border: rgba(59, 130, 246, 0.25);
    --callout-info-text: #1d4ed8;
    --callout-warn-bg: rgba(245, 158, 11, 0.06);
    --callout-warn-border: rgba(245, 158, 11, 0.25);
    --callout-warn-text: #b45309;
    --callout-tip-bg: rgba(34, 197, 94, 0.06);
    --callout-tip-border: rgba(34, 197, 94, 0.25);
    --callout-tip-text: #15803d;
    --callout-danger-bg: rgba(239, 68, 68, 0.06);
    --callout-danger-border: rgba(239, 68, 68, 0.25);
    --callout-danger-text: #b91c1c;
    --code-bg: #f3f4f6;
    --code-text: #1f2937;
    --code-inline-bg: rgba(217, 119, 6, 0.08);
    --code-inline-text: #b45309;
    --scrollbar-track: transparent;
    --scrollbar-thumb: rgba(0, 0, 0, 0.15);
    --scrollbar-thumb-hover: rgba(0, 0, 0, 0.25);
}

/* --- Reset & Base --- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
    font-family: var(--font-body);
    font-size: 15px;
    line-height: 1.7;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    display: flex;
    min-height: 100vh;
    overflow-x: hidden;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Portal mode: no sidebar, main fills full width */
body.portal-mode .sidebar { display: none; }
body.portal-mode .main { margin-left: 0; }

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--scrollbar-track); }
::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--scrollbar-thumb-hover); }

/* ========================================================
   Portal Landing Page
   ======================================================== */
.portal-page {
    text-align: center;
    padding: 80px 32px 60px;
    max-width: 900px;
    margin: 0 auto;
}

.portal-hero-icon {
    font-size: 64px;
    margin-bottom: 24px;
    display: block;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

.portal-page h1 {
    font-size: 42px;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 12px;
    line-height: 1.15;
}

.portal-page h1 .accent {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.portal-page > p {
    font-size: 17px;
    color: var(--text-secondary);
    max-width: 520px;
    margin: 0 auto 48px;
    line-height: 1.7;
}

.portal-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.portal-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-xl);
    padding: 32px 24px;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    position: relative;
    overflow: hidden;
}

.portal-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--accent-glow), transparent 60%);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.portal-card:hover {
    border-color: var(--border-active);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg), 0 0 0 1px var(--accent-glow);
}

.portal-card:hover::before {
    opacity: 1;
}

.portal-card-icon {
    font-size: 40px;
    position: relative;
    z-index: 1;
}

.portal-card h3 {
    font-size: 18px;
    font-weight: 700;
    position: relative;
    z-index: 1;
}

.portal-card p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
    position: relative;
    z-index: 1;
}

.portal-card .card-meta {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-accent);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    position: relative;
    z-index: 1;
}

/* Add project card */
.portal-card.add-card {
    border-style: dashed;
    border-color: var(--border-primary);
    background: transparent;
}

.portal-card.add-card:hover {
    border-color: var(--text-accent);
    background: var(--bg-hover);
}

.portal-card.add-card .portal-card-icon {
    font-size: 32px;
    opacity: 0.5;
}

.portal-card.add-card h3 {
    color: var(--text-tertiary);
    font-weight: 500;
}

/* ========================================================
   Sidebar
   ======================================================== */
.sidebar {
    position: fixed;
    left: 0; top: 0; bottom: 0;
    width: var(--sidebar-width);
    background: var(--bg-sidebar);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-right: 1px solid var(--border-primary);
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: transform var(--transition-slow);
}

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 99;
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-secondary);
    min-height: 64px;
}

.sidebar-brand { display: flex; align-items: center; gap: 12px; }

.brand-icon {
    width: 38px; height: 38px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    display: flex; align-items: center; justify-content: center;
    color: #0f1117;
    flex-shrink: 0;
    box-shadow: 0 2px 8px var(--accent-glow);
}

.brand-text { display: flex; flex-direction: column; }
.brand-name { font-size: 16px; font-weight: 700; color: var(--text-primary); line-height: 1.2; letter-spacing: -0.02em; }
.brand-sub { font-size: 11px; font-weight: 500; color: var(--text-tertiary); text-transform: uppercase; letter-spacing: 0.08em; }

.sidebar-close-btn {
    display: none;
    align-items: center; justify-content: center;
    width: 32px; height: 32px;
    border: none;
    background: var(--bg-hover);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}
.sidebar-close-btn:hover { background: var(--bg-active); color: var(--text-primary); }

/* Back to Portal */
.sidebar-back {
    padding: 8px 16px;
}

.back-link {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    font-size: 13px;
    color: var(--text-tertiary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.back-link:hover {
    color: var(--text-accent);
    background: var(--bg-hover);
}

/* Sidebar Search */
.sidebar-search { padding: 12px 16px; }
.search-input-wrapper { position: relative; display: flex; align-items: center; }
.search-icon { position: absolute; left: 12px; color: var(--text-tertiary); pointer-events: none; }
.sidebar-search input {
    width: 100%;
    padding: 9px 40px 9px 38px;
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 13px;
    outline: none;
    transition: all var(--transition-fast);
}
.sidebar-search input::placeholder { color: var(--text-tertiary); }
.sidebar-search input:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
    background: var(--bg-elevated);
}
.search-kbd {
    position: absolute; right: 10px;
    padding: 2px 7px;
    border: 1px solid var(--border-primary);
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-tertiary);
    background: var(--bg-secondary);
    line-height: 1.4;
}

/* Search Results */
.search-results { flex: 1; overflow-y: auto; padding: 0 12px 12px; }
.search-results-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 8px 8px 10px;
    font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-tertiary);
}
.search-clear-btn { border: none; background: none; color: var(--text-accent); cursor: pointer; font-size: 11px; font-weight: 600; font-family: var(--font-body); text-transform: uppercase; letter-spacing: 0.05em; }
.search-clear-btn:hover { text-decoration: underline; }
.search-result-item { display: block; padding: 10px 12px; border-radius: var(--radius-sm); cursor: pointer; transition: all var(--transition-fast); text-decoration: none; }
.search-result-item:hover { background: var(--bg-hover); }
.search-result-title { font-size: 13px; font-weight: 600; color: var(--text-primary); margin-bottom: 2px; }
.search-result-category { font-size: 11px; color: var(--text-tertiary); }
.search-result-snippet { font-size: 12px; color: var(--text-secondary); margin-top: 4px; line-height: 1.5; }
.search-result-snippet mark { background: var(--accent-glow); color: var(--text-accent); border-radius: 2px; padding: 0 2px; }
.search-no-results { text-align: center; padding: 32px 16px; color: var(--text-tertiary); font-size: 13px; }

/* Sidebar Navigation */
.sidebar-nav { flex: 1; overflow-y: auto; padding: 8px 12px; }

.nav-category { margin-bottom: 4px; }
.nav-category-header {
    display: flex; align-items: center; gap: 8px;
    padding: 8px 10px;
    font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-tertiary);
    cursor: pointer; border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    user-select: none;
}
.nav-category-header:hover { color: var(--text-secondary); background: var(--bg-hover); }
.nav-category-icon { font-size: 14px; line-height: 1; }
.nav-category-chevron { margin-left: auto; transition: transform var(--transition-fast); color: var(--text-tertiary); opacity: 0.5; }
.nav-category.collapsed .nav-category-chevron { transform: rotate(-90deg); }
.nav-category.collapsed .nav-category-items { display: none; }
.nav-category-items { padding: 2px 0 8px; }

/* Add article button in sidebar */
.nav-add-btn {
    display: flex; align-items: center; gap: 8px;
    padding: 6px 10px 6px 18px;
    margin-left: 8px;
    font-size: 12px;
    color: var(--text-tertiary);
    cursor: pointer; border: none; background: none;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    font-family: var(--font-body);
    width: calc(100% - 8px);
    text-align: left;
}
.nav-add-btn:hover { color: var(--text-accent); background: var(--bg-hover); }

.nav-item {
    display: flex; align-items: center; gap: 10px;
    padding: 7px 10px 7px 18px;
    font-size: 13px; color: var(--text-secondary); text-decoration: none;
    border-radius: var(--radius-sm); cursor: pointer;
    transition: all var(--transition-fast); line-height: 1.4;
    border-left: 2px solid transparent; margin-left: 8px;
}
.nav-item:hover { color: var(--text-primary); background: var(--bg-hover); }
.nav-item.active { color: var(--text-accent); background: var(--bg-active); border-left-color: var(--accent-primary); font-weight: 500; }
.nav-item-icon { font-size: 15px; line-height: 1; flex-shrink: 0; }
.nav-item-label { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.sidebar-footer { padding: 12px 16px; border-top: 1px solid var(--border-secondary); }
.sidebar-footer-meta { font-size: 11px; color: var(--text-tertiary); opacity: 0.6; }

/* ========================================================
   Main Content Area
   ======================================================== */
.main {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: margin-left var(--transition-slow);
}

.topbar {
    position: sticky; top: 0; z-index: 50;
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 24px; height: var(--topbar-height);
    background: var(--bg-sidebar);
    backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-secondary);
}
.topbar-left { display: flex; align-items: center; gap: 12px; min-width: 0; }

.hamburger-btn {
    display: none; align-items: center; justify-content: center;
    width: 36px; height: 36px; border: none;
    background: var(--bg-hover); border-radius: var(--radius-sm);
    color: var(--text-secondary); cursor: pointer; flex-shrink: 0;
    transition: all var(--transition-fast);
}
.hamburger-btn:hover { background: var(--bg-active); color: var(--text-primary); }

.breadcrumbs { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--text-tertiary); min-width: 0; overflow: hidden; }
.breadcrumb-item { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; color: var(--text-tertiary); text-decoration: none; transition: color var(--transition-fast); cursor: pointer; }
.breadcrumb-item:hover { color: var(--text-primary); }
.breadcrumb-item.current { color: var(--text-secondary); font-weight: 500; cursor: default; }
.breadcrumb-sep { color: var(--text-tertiary); opacity: 0.4; flex-shrink: 0; }

.topbar-right { display: flex; align-items: center; gap: 8px; }
.theme-toggle {
    display: flex; align-items: center; justify-content: center;
    width: 36px; height: 36px;
    border: 1px solid var(--border-primary); background: var(--bg-tertiary);
    border-radius: var(--radius-md); color: var(--text-secondary); cursor: pointer;
    transition: all var(--transition-fast);
}
.theme-toggle:hover { border-color: var(--accent-primary); color: var(--text-accent); box-shadow: 0 0 0 3px var(--accent-glow); }
[data-theme="dark"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: block; }
[data-theme="light"] .icon-sun { display: block; }
[data-theme="light"] .icon-moon { display: none; }

.reading-progress {
    position: sticky; top: var(--topbar-height); height: 3px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    width: 0%; z-index: 49; transition: width 100ms linear; border-radius: 0 2px 2px 0;
}

.content-wrapper { display: flex; flex: 1; padding: 0; max-width: 100%; }

.content {
    flex: 1; max-width: var(--content-max-width); margin: 0 auto;
    padding: 40px 48px 80px; min-width: 0;
    animation: fadeIn var(--transition-normal) ease;
}
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

/* --- Home Page (inside project) --- */
.home-hero { text-align: center; padding: 60px 0 48px; }
.home-hero-icon { font-size: 56px; margin-bottom: 20px; display: block; animation: float 3s ease-in-out infinite; }
.home-hero h1 { font-size: 36px; font-weight: 800; color: var(--text-primary); margin-bottom: 12px; letter-spacing: -0.03em; line-height: 1.2; }
.home-hero h1 .accent {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.home-hero p { font-size: 16px; color: var(--text-secondary); max-width: 480px; margin: 0 auto; line-height: 1.7; }

.home-categories { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; margin-top: 40px; }

.home-category-card {
    background: var(--bg-secondary); border: 1px solid var(--border-primary); border-radius: var(--radius-lg);
    padding: 24px; cursor: pointer; transition: all var(--transition-normal); text-decoration: none; display: block;
}
.home-category-card:hover { border-color: var(--border-active); transform: translateY(-2px); box-shadow: var(--shadow-md), 0 0 0 1px var(--accent-glow); }
.home-category-card-icon { font-size: 28px; margin-bottom: 12px; display: block; }
.home-category-card h3 { font-size: 15px; font-weight: 700; color: var(--text-primary); margin-bottom: 6px; }
.home-category-card p { font-size: 13px; color: var(--text-secondary); line-height: 1.6; }
.home-category-card .article-count { display: inline-block; margin-top: 12px; font-size: 11px; font-weight: 600; color: var(--text-accent); text-transform: uppercase; letter-spacing: 0.06em; }

/* --- Article Styles --- */
.article-header { margin-bottom: 32px; padding-bottom: 24px; border-bottom: 1px solid var(--border-primary); }
.article-header-actions { display: flex; gap: 8px; margin-top: 12px; }

.btn-edit, .btn-delete {
    display: inline-flex; align-items: center; gap: 5px;
    padding: 6px 14px;
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-sm);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: 12px; font-weight: 500;
    cursor: pointer; font-family: var(--font-body);
    transition: all var(--transition-fast);
}
.btn-edit:hover { border-color: var(--accent-primary); color: var(--text-accent); }
.btn-delete:hover { border-color: var(--callout-danger-border); color: var(--callout-danger-text); }

.article-category-badge {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 4px 12px; border-radius: 20px;
    background: var(--bg-active); font-size: 11px; font-weight: 600;
    color: var(--text-accent); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 16px;
}
.article-title { font-size: 32px; font-weight: 800; color: var(--text-primary); line-height: 1.2; letter-spacing: -0.03em; margin-bottom: 8px; }
.article-title-input {
    font-size: 32px; font-weight: 800; color: var(--text-primary); line-height: 1.2; letter-spacing: -0.03em;
    border: none; background: transparent; width: 100%; outline: none;
    border-bottom: 2px solid var(--accent-primary); padding-bottom: 4px;
    font-family: var(--font-body);
}
.article-meta { display: flex; align-items: center; gap: 16px; font-size: 13px; color: var(--text-tertiary); }
.article-meta-item { display: flex; align-items: center; gap: 5px; }

/* Article Body */
.article-body h2 { font-size: 22px; font-weight: 700; color: var(--text-primary); margin: 40px 0 16px; padding-bottom: 8px; border-bottom: 1px solid var(--border-secondary); letter-spacing: -0.02em; scroll-margin-top: calc(var(--topbar-height) + 24px); }
.article-body h3 { font-size: 17px; font-weight: 700; color: var(--text-primary); margin: 28px 0 12px; letter-spacing: -0.01em; scroll-margin-top: calc(var(--topbar-height) + 24px); }
.article-body h4 { font-size: 15px; font-weight: 600; color: var(--text-primary); margin: 20px 0 8px; scroll-margin-top: calc(var(--topbar-height) + 24px); }
.article-body p { margin-bottom: 16px; color: var(--text-secondary); line-height: 1.8; }
.article-body ul, .article-body ol { margin: 0 0 16px 20px; color: var(--text-secondary); }
.article-body li { margin-bottom: 6px; line-height: 1.7; }
.article-body li strong { color: var(--text-primary); }
.article-body a { color: var(--text-link); text-decoration: none; border-bottom: 1px solid transparent; transition: border-color var(--transition-fast); }
.article-body a:hover { border-bottom-color: var(--text-link); }
.article-body strong { color: var(--text-primary); font-weight: 600; }
.article-body img { max-width: 100%; border-radius: var(--radius-md); border: 1px solid var(--border-primary); margin: 16px 0; }
.article-body code { font-family: var(--font-mono); font-size: 13px; padding: 2px 7px; background: var(--code-inline-bg); color: var(--code-inline-text); border-radius: 4px; }
.article-body pre { background: var(--code-bg); border: 1px solid var(--border-primary); border-radius: var(--radius-md); padding: 16px 20px; overflow-x: auto; margin: 16px 0; font-size: 13px; line-height: 1.6; }
.article-body pre code { background: none; padding: 0; color: var(--code-text); }
.article-body table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 14px; }
.article-body table th, .article-body table td { padding: 10px 14px; text-align: left; border: 1px solid var(--border-primary); }
.article-body table th { background: var(--bg-tertiary); font-weight: 600; color: var(--text-primary); font-size: 13px; text-transform: uppercase; letter-spacing: 0.04em; }
.article-body table td { color: var(--text-secondary); }
.article-body table tr:hover td { background: var(--bg-hover); }

/* Editing mode for article body */
.article-body[contenteditable="true"] {
    outline: none;
    border: 2px solid var(--accent-primary);
    border-radius: var(--radius-md);
    padding: 20px;
    background: var(--bg-secondary);
    min-height: 300px;
}
.article-body[contenteditable="true"]:focus {
    box-shadow: 0 0 0 4px var(--accent-glow);
}

/* Callouts */
.callout { padding: 16px 20px; border-radius: var(--radius-md); border-left: 4px solid; margin: 16px 0; font-size: 14px; line-height: 1.7; }
.callout-title { font-weight: 700; margin-bottom: 4px; display: flex; align-items: center; gap: 8px; font-size: 13px; text-transform: uppercase; letter-spacing: 0.04em; }
.callout.info { background: var(--callout-info-bg); border-color: var(--callout-info-border); color: var(--callout-info-text); }
.callout.warning { background: var(--callout-warn-bg); border-color: var(--callout-warn-border); color: var(--callout-warn-text); }
.callout.tip { background: var(--callout-tip-bg); border-color: var(--callout-tip-border); color: var(--callout-tip-text); }
.callout.danger { background: var(--callout-danger-bg); border-color: var(--callout-danger-border); color: var(--callout-danger-text); }

/* Toggle/Accordion */
.toggle-section { border: 1px solid var(--border-primary); border-radius: var(--radius-md); margin: 12px 0; overflow: hidden; }
.toggle-header { display: flex; align-items: center; gap: 10px; padding: 12px 16px; background: var(--bg-secondary); cursor: pointer; font-weight: 600; font-size: 14px; color: var(--text-primary); transition: background var(--transition-fast); user-select: none; }
.toggle-header:hover { background: var(--bg-tertiary); }
.toggle-chevron { transition: transform var(--transition-fast); color: var(--text-tertiary); flex-shrink: 0; }
.toggle-section.open .toggle-chevron { transform: rotate(90deg); }
.toggle-content { display: none; padding: 16px; border-top: 1px solid var(--border-secondary); }
.toggle-section.open .toggle-content { display: block; }

/* Article Navigation (Prev/Next) */
.article-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--border-primary); }
.article-nav-link { display: flex; flex-direction: column; gap: 4px; padding: 16px; border: 1px solid var(--border-primary); border-radius: var(--radius-md); text-decoration: none; transition: all var(--transition-fast); cursor: pointer; }
.article-nav-link:hover { border-color: var(--border-active); box-shadow: 0 0 0 3px var(--accent-glow); }
.article-nav-link.next { text-align: right; grid-column: 2; }
.article-nav-label { font-size: 11px; font-weight: 600; color: var(--text-tertiary); text-transform: uppercase; letter-spacing: 0.06em; }
.article-nav-title { font-size: 14px; font-weight: 600; color: var(--text-accent); }

/* ========================================================
   Editor Toolbar
   ======================================================== */
.editor-toolbar {
    position: sticky;
    top: var(--topbar-height);
    z-index: 48;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border-primary);
    padding: 8px 24px;
    box-shadow: var(--shadow-sm);
}

.editor-toolbar-inner {
    display: flex;
    align-items: center;
    gap: 4px;
    max-width: var(--content-max-width);
    margin: 0 auto;
    flex-wrap: wrap;
}

.editor-select {
    padding: 6px 10px;
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-sm);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 12px;
    cursor: pointer;
    outline: none;
}

.editor-btn {
    display: flex; align-items: center; justify-content: center;
    min-width: 32px; height: 32px; padding: 0 8px;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-size: 13px;
    cursor: pointer;
    transition: all var(--transition-fast);
}
.editor-btn:hover { background: var(--bg-hover); color: var(--text-primary); border-color: var(--border-primary); }
.editor-btn-save { background: var(--accent-primary); color: #0f1117; font-weight: 600; padding: 0 16px; border-color: var(--accent-primary); }
.editor-btn-save:hover { background: var(--accent-secondary); }
.editor-btn-cancel { color: var(--text-tertiary); padding: 0 12px; }
.editor-btn-cancel:hover { color: var(--callout-danger-text); }

.editor-separator {
    width: 1px; height: 20px;
    background: var(--border-primary);
    margin: 0 4px;
}

/* ========================================================
   Table of Contents
   ======================================================== */
.toc { position: sticky; top: calc(var(--topbar-height) + 24px); width: var(--toc-width); max-height: calc(100vh - var(--topbar-height) - 48px); overflow-y: auto; padding: 24px 16px 24px 0; flex-shrink: 0; display: none; }
.toc.visible { display: block; }
.toc-title { font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-tertiary); margin-bottom: 12px; padding-left: 12px; }
.toc-nav a { display: block; padding: 5px 12px; font-size: 12px; color: var(--text-tertiary); text-decoration: none; border-left: 2px solid var(--border-secondary); transition: all var(--transition-fast); line-height: 1.5; }
.toc-nav a:hover { color: var(--text-secondary); border-left-color: var(--text-secondary); }
.toc-nav a.active { color: var(--text-accent); border-left-color: var(--accent-primary); font-weight: 500; }
.toc-nav a.toc-h3 { padding-left: 24px; font-size: 11px; }

/* ========================================================
   Modal
   ======================================================== */
.modal-overlay {
    position: fixed; inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 200;
    display: flex; align-items: center; justify-content: center;
    padding: 20px;
}

.modal {
    background: var(--bg-elevated);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    width: 100%; max-width: 480px;
    box-shadow: var(--shadow-lg);
    animation: fadeIn var(--transition-normal) ease;
}

.modal-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 20px 24px 16px;
    border-bottom: 1px solid var(--border-secondary);
}

.modal-title { font-size: 18px; font-weight: 700; }

.modal-close {
    width: 32px; height: 32px;
    display: flex; align-items: center; justify-content: center;
    border: none; background: var(--bg-hover);
    border-radius: var(--radius-sm); color: var(--text-secondary);
    cursor: pointer; font-size: 16px;
    transition: all var(--transition-fast);
}
.modal-close:hover { background: var(--bg-tertiary); color: var(--text-primary); }

.modal-body { padding: 20px 24px; }

.modal-field { margin-bottom: 16px; }
.modal-field label {
    display: block; font-size: 12px; font-weight: 600; color: var(--text-secondary);
    margin-bottom: 6px; text-transform: uppercase; letter-spacing: 0.04em;
}
.modal-field input, .modal-field select, .modal-field textarea {
    width: 100%; padding: 10px 14px;
    border: 1px solid var(--border-primary); border-radius: var(--radius-md);
    background: var(--bg-tertiary); color: var(--text-primary);
    font-family: var(--font-body); font-size: 14px; outline: none;
    transition: border-color var(--transition-fast);
}
.modal-field input:focus, .modal-field select:focus, .modal-field textarea:focus {
    border-color: var(--accent-primary); box-shadow: 0 0 0 3px var(--accent-glow);
}

.modal-footer {
    display: flex; justify-content: flex-end; gap: 8px;
    padding: 16px 24px 20px;
    border-top: 1px solid var(--border-secondary);
}

.modal-btn {
    padding: 8px 20px; border-radius: var(--radius-md);
    font-family: var(--font-body); font-size: 14px; font-weight: 600;
    cursor: pointer; transition: all var(--transition-fast); border: none;
}
.modal-btn-secondary { background: var(--bg-tertiary); color: var(--text-secondary); }
.modal-btn-secondary:hover { background: var(--bg-hover); color: var(--text-primary); }
.modal-btn-primary { background: var(--accent-primary); color: #0f1117; }
.modal-btn-primary:hover { background: var(--accent-secondary); }

/* ========================================================
   Toast Notification
   ======================================================== */
.toast {
    position: fixed; bottom: 24px; right: 24px;
    padding: 12px 24px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 14px; font-weight: 500;
    box-shadow: var(--shadow-lg);
    z-index: 300;
    transform: translateY(100px);
    opacity: 0;
    transition: all var(--transition-normal);
    pointer-events: none;
}
.toast.visible { transform: translateY(0); opacity: 1; }
.toast.success { border-left: 4px solid var(--callout-tip-border); }
.toast.error { border-left: 4px solid var(--callout-danger-border); }

/* ========================================================
   Loading State
   ======================================================== */
.loading-spinner {
    display: flex; align-items: center; justify-content: center;
    padding: 60px; color: var(--text-tertiary);
}
.loading-spinner::after {
    content: '';
    width: 32px; height: 32px;
    border: 3px solid var(--border-primary);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ========================================================
   Responsive
   ======================================================== */
@media (max-width: 1200px) { .toc { display: none !important; } }
@media (max-width: 768px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.open { transform: translateX(0); }
    .sidebar-overlay.active { display: block; }
    .sidebar-close-btn { display: flex; }
    .main { margin-left: 0; }
    .hamburger-btn { display: flex; }
    .content { padding: 24px 20px 60px; }
    .home-hero h1 { font-size: 28px; }
    .home-categories { grid-template-columns: 1fr; }
    .article-title { font-size: 24px; }
    .article-nav { grid-template-columns: 1fr; }
    .article-nav-link.next { grid-column: 1; text-align: left; }
    .portal-page { padding: 40px 20px; }
    .portal-page h1 { font-size: 30px; }
    .portal-grid { grid-template-columns: 1fr; }
}

/* ========================================================
   Print
   ======================================================== */
@media print {
    .sidebar, .topbar, .toc, .reading-progress, .article-nav, .editor-toolbar, .btn-edit, .btn-delete { display: none !important; }
    .main { margin-left: 0 !important; }
    .content { max-width: 100% !important; padding: 0 !important; }
    body { color: #111 !important; background: #fff !important; }
}