/* Reset & Base */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Dark theme (default) */
[data-theme="dark"] {
    --sidebar-width: 280px;
    --sidebar-bg: #1a1a2e;
    --sidebar-text: #a0a0b8;
    --sidebar-text-active: #ffffff;
    --sidebar-hover-bg: rgba(255, 255, 255, 0.06);
    --sidebar-section-title: #6b6b80;
    --content-bg: #0f0f1a;
    --content-text: #d4d4e0;
    --heading-color: #ffffff;
    --code-bg: #161625;
    --code-border: #2a2a40;
    --code-text: #e0e0f0;
    --link-color: #6c9fff;
    --accent: #4285f4;
    --accent-hover: #5a9bff;
    --border-color: #2a2a40;
    --table-header-bg: #1a1a2e;
    --table-row-hover: rgba(66, 133, 244, 0.05);
    --callout-info-bg: rgba(66, 133, 244, 0.08);
    --callout-info-border: #4285f4;
    --callout-warning-bg: rgba(251, 188, 4, 0.08);
    --callout-warning-border: #fbbc04;
    --callout-tip-bg: rgba(52, 168, 83, 0.08);
    --callout-tip-border: #34a853;
    --callout-danger-bg: rgba(234, 67, 53, 0.08);
    --callout-danger-border: #ea4335;
    --kbd-bg: #2a2a40;
    --kbd-border: #3a3a50;
    --scrollbar-thumb: #3a3a50;
    --scrollbar-track: transparent;
    --feature-card-bg: #161625;
    --feature-card-border: #2a2a40;
    --nav-active-bg: rgba(66, 133, 244, 0.12);
    --nav-active-border: #4285f4;
    --search-bg: #161625;
    --search-border: #2a2a40;
    --inline-code-color: #e8a0bf;
    --settings-panel-bg: #1a1a2e;
}

/* Light theme */
[data-theme="light"] {
    --sidebar-bg: #f5f6fa;
    --sidebar-text: #4a4a6a;
    --sidebar-text-active: #1a1a2e;
    --sidebar-hover-bg: rgba(0, 0, 0, 0.04);
    --sidebar-section-title: #8888a0;
    --content-bg: #ffffff;
    --content-text: #333340;
    --heading-color: #1a1a2e;
    --code-bg: #f5f6fa;
    --code-border: #e0e0e8;
    --code-text: #333340;
    --link-color: #1a73e8;
    --accent: #1a73e8;
    --accent-hover: #1565c0;
    --border-color: #e0e0e8;
    --table-header-bg: #f5f6fa;
    --table-row-hover: rgba(26, 115, 232, 0.04);
    --callout-info-bg: rgba(26, 115, 232, 0.06);
    --callout-info-border: #1a73e8;
    --callout-warning-bg: rgba(234, 160, 0, 0.06);
    --callout-warning-border: #e8a000;
    --callout-tip-bg: rgba(24, 128, 56, 0.06);
    --callout-tip-border: #188038;
    --callout-danger-bg: rgba(211, 47, 47, 0.06);
    --callout-danger-border: #d32f2f;
    --kbd-bg: #e8e8f0;
    --kbd-border: #d0d0d8;
    --scrollbar-thumb: #c0c0d0;
    --scrollbar-track: transparent;
    --feature-card-bg: #f9f9fc;
    --feature-card-border: #e0e0e8;
    --nav-active-bg: rgba(26, 115, 232, 0.08);
    --nav-active-border: #1a73e8;
    --search-bg: #ffffff;
    --search-border: #e0e0e8;
    --inline-code-color: #c23373;
    --settings-panel-bg: #f5f6fa;
}

/* Font size */
[data-fontsize="small"] { font-size: 13px; }
[data-fontsize="medium"] { font-size: 15px; }
[data-fontsize="large"] { font-size: 17px; }
[data-fontsize="xlarge"] { font-size: 19px; }

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--content-bg);
    color: var(--content-text);
    line-height: 1.7;
    display: flex;
    min-height: 100vh;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--scrollbar-track);
}

::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 3px;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    z-index: 100;
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 15px;
    color: var(--heading-color);
    letter-spacing: -0.3px;
}

.version-badge {
    font-size: 11px;
    padding: 2px 8px;
    background: rgba(66, 133, 244, 0.15);
    color: var(--accent);
    border-radius: 10px;
    font-weight: 500;
}

.sidebar-search {
    padding: 12px 16px;
    position: relative;
}

.sidebar-search input {
    width: 100%;
    padding: 8px 12px 8px 34px;
    background: var(--search-bg);
    border: 1px solid var(--search-border);
    border-radius: 6px;
    color: var(--content-text);
    font-size: 13px;
    font-family: inherit;
    outline: none;
    transition: border-color 0.2s;
}

.sidebar-search input:focus {
    border-color: var(--accent);
}

.sidebar-search input::placeholder {
    color: var(--sidebar-section-title);
}

.search-icon {
    position: absolute;
    left: 28px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--sidebar-section-title);
    pointer-events: none;
}

.sidebar-nav {
    flex: 1;
    padding: 8px 0 24px;
    overflow-y: auto;
}

.nav-section {
    padding: 0 12px;
    margin-bottom: 8px;
}

.nav-section-title {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--sidebar-section-title);
    padding: 16px 12px 6px;
}

.nav-link {
    display: block;
    padding: 6px 12px;
    color: var(--sidebar-text);
    text-decoration: none;
    font-size: 13.5px;
    font-weight: 400;
    border-radius: 6px;
    border-left: 3px solid transparent;
    transition: all 0.15s ease;
    margin-bottom: 1px;
}

.nav-link:hover {
    background: var(--sidebar-hover-bg);
    color: var(--sidebar-text-active);
}

.nav-link.active {
    background: var(--nav-active-bg);
    color: var(--sidebar-text-active);
    border-left-color: var(--nav-active-border);
    font-weight: 500;
}

.nav-link.hidden {
    display: none;
}

/* Mobile sidebar */
.sidebar-toggle {
    display: none;
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 200;
    background: var(--sidebar-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--content-text);
    padding: 8px;
    cursor: pointer;
}

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 90;
}

/* Content */
.content {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
}

.content-inner {
    max-width: 820px;
    margin: 0 auto;
    padding: 40px 48px 80px;
}

.section {
    display: none;
}

.section.active {
    display: block;
    animation: fadeIn 0.25s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Breadcrumb */
.breadcrumb {
    font-size: 12px;
    color: var(--sidebar-section-title);
    margin-bottom: 4px;
    letter-spacing: 0.3px;
}

/* Doc link banner */
.doc-link-banner {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px 4px 8px;
    margin-bottom: 10px;
    font-size: 12px;
    font-weight: 500;
    color: var(--accent);
    background: var(--callout-info-bg);
    border: 1px solid var(--accent);
    border-radius: 6px;
    text-decoration: none;
    transition: all 0.15s;
    opacity: 0.85;
}

.doc-link-banner:hover {
    opacity: 1;
    background: var(--nav-active-bg);
    text-decoration: none;
}

.doc-link-banner svg {
    flex-shrink: 0;
}

/* Typography */
h1 {
    font-size: 32px;
    font-weight: 700;
    color: var(--heading-color);
    margin-bottom: 20px;
    letter-spacing: -0.5px;
    line-height: 1.3;
}

h2 {
    font-size: 22px;
    font-weight: 600;
    color: var(--heading-color);
    margin-top: 40px;
    margin-bottom: 14px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
    letter-spacing: -0.3px;
    scroll-margin-top: 20px;
    position: relative;
}

h2 .heading-anchor {
    color: var(--accent);
    text-decoration: none;
    font-size: 0.75em;
    font-weight: 400;
    opacity: 0;
    margin-left: 8px;
    transition: opacity 0.15s ease;
    vertical-align: middle;
}

h2:hover .heading-anchor {
    opacity: 0.6;
}

h2 .heading-anchor:hover {
    opacity: 1;
    text-decoration: none;
}

h3 {
    font-size: 17px;
    font-weight: 600;
    color: var(--heading-color);
    margin-top: 24px;
    margin-bottom: 10px;
}

p {
    margin-bottom: 14px;
    font-size: 15px;
}

a {
    color: var(--link-color);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

ul, ol {
    margin-bottom: 14px;
    padding-left: 24px;
}

li {
    margin-bottom: 6px;
    font-size: 15px;
}

code {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 13px;
    background: var(--code-bg);
    border: 1px solid var(--code-border);
    border-radius: 4px;
    padding: 2px 6px;
    color: var(--inline-code-color);
}

kbd {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    background: var(--kbd-bg);
    border: 1px solid var(--kbd-border);
    border-radius: 4px;
    padding: 2px 7px;
    color: var(--content-text);
    box-shadow: 0 1px 0 var(--kbd-border);
}

strong {
    color: var(--heading-color);
    font-weight: 600;
}

/* Code blocks */
.code-block {
    margin-bottom: 20px;
    border-radius: 8px;
    border: 1px solid var(--code-border);
    overflow: hidden;
    background: var(--code-bg);
}

.code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.03);
    border-bottom: 1px solid var(--code-border);
    font-size: 12px;
    color: var(--sidebar-section-title);
}

.copy-btn {
    padding: 3px 10px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--sidebar-text);
    font-size: 11px;
    cursor: pointer;
    font-family: inherit;
    transition: all 0.15s;
}

.copy-btn:hover {
    background: var(--sidebar-hover-bg);
    color: var(--heading-color);
}

.copy-btn.copied {
    color: var(--callout-tip-border);
    border-color: var(--callout-tip-border);
}

.code-block pre {
    padding: 16px;
    overflow-x: auto;
    line-height: 1.6;
}

.code-block code {
    background: none;
    border: none;
    padding: 0;
    font-size: 13.5px;
    color: var(--code-text);
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
    font-size: 14px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
}

thead {
    background: var(--table-header-bg);
}

th {
    text-align: left;
    padding: 10px 16px;
    font-weight: 600;
    color: var(--heading-color);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border-color);
}

td {
    padding: 10px 16px;
    border-bottom: 1px solid var(--border-color);
}

tr:last-child td {
    border-bottom: none;
}

tr:hover td {
    background: var(--table-row-hover);
}

/* Callouts */
.callout {
    border-radius: 8px;
    padding: 16px 20px;
    margin-bottom: 20px;
    border-left: 4px solid;
}

.callout-title {
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 6px;
}

.callout p {
    margin-bottom: 0;
    font-size: 14px;
}

.callout-info {
    background: var(--callout-info-bg);
    border-color: var(--callout-info-border);
}
.callout-info .callout-title {
    color: var(--callout-info-border);
}

.callout-warning {
    background: var(--callout-warning-bg);
    border-color: var(--callout-warning-border);
}
.callout-warning .callout-title {
    color: var(--callout-warning-border);
}

.callout-tip {
    background: var(--callout-tip-bg);
    border-color: var(--callout-tip-border);
}
.callout-tip .callout-title {
    color: var(--callout-tip-border);
}

.callout-danger {
    background: var(--callout-danger-bg);
    border-color: var(--callout-danger-border);
}
.callout-danger .callout-title {
    color: var(--callout-danger-border);
}

/* Feature grid */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.feature-card {
    background: var(--feature-card-bg);
    border: 1px solid var(--feature-card-border);
    border-radius: 10px;
    padding: 20px;
    transition: border-color 0.2s;
}

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

.feature-icon {
    font-size: 28px;
    margin-bottom: 10px;
}

.feature-card h3 {
    margin-top: 0;
    margin-bottom: 6px;
    font-size: 15px;
}

.feature-card p {
    font-size: 13.5px;
    color: var(--sidebar-text);
    margin-bottom: 0;
}

/* Page navigation */
.page-nav {
    display: flex;
    justify-content: space-between;
    margin-top: 60px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    gap: 16px;
}

.page-nav a {
    display: block;
    padding: 14px 20px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    text-decoration: none;
    transition: all 0.2s;
    min-width: 180px;
}

.page-nav a:hover {
    border-color: var(--accent);
    background: rgba(66, 133, 244, 0.05);
    text-decoration: none;
}

.page-nav-prev {
    text-align: left;
}

.page-nav-next {
    text-align: right;
}

.page-nav-label {
    display: block;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--sidebar-section-title);
    margin-bottom: 4px;
}

.page-nav-title {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--accent);
}

/* Responsive */
@media (max-width: 900px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar-toggle {
        display: flex;
    }

    .sidebar-overlay.active {
        display: block;
    }

    .content {
        margin-left: 0;
    }

    .content-inner {
        padding: 60px 20px 80px;
    }

    .feature-grid {
        grid-template-columns: 1fr;
    }

    .page-nav {
        flex-direction: column;
    }

    .page-nav a {
        min-width: auto;
    }

    h1 {
        font-size: 26px;
    }

    h2 {
        font-size: 20px;
    }

    table {
        font-size: 13px;
    }

    th, td {
        padding: 8px 10px;
    }
}

@media (max-width: 480px) {
    .content-inner {
        padding: 56px 16px 60px;
    }

    .code-block pre {
        padding: 12px;
    }

    .code-block code {
        font-size: 12px;
    }
}

/* Settings button */
.settings-btn {
    position: fixed;
    top: 12px;
    right: 16px;
    z-index: 200;
    background: var(--sidebar-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--content-text);
    padding: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.settings-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* Settings panel */
.settings-panel {
    position: fixed;
    top: 52px;
    right: 16px;
    z-index: 200;
    width: 260px;
    background: var(--settings-panel-bg, var(--sidebar-bg));
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 0;
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
    display: none;
    animation: fadeIn 0.15s ease;
}

.settings-panel.open {
    display: block;
}

.settings-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 16px 10px;
    border-bottom: 1px solid var(--border-color);
}

.settings-panel-title {
    font-weight: 600;
    font-size: 14px;
    color: var(--heading-color);
}

.settings-close {
    background: none;
    border: none;
    color: var(--sidebar-text);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    display: flex;
}

.settings-close:hover {
    color: var(--heading-color);
}

.settings-group {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-color);
}

.settings-group:last-child {
    border-bottom: none;
}

.settings-label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    color: var(--sidebar-section-title);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 10px;
}

.theme-toggle {
    display: flex;
    gap: 8px;
}

.theme-option {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 12px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--sidebar-text);
    font-family: inherit;
    font-size: 12px;
    cursor: pointer;
    transition: all 0.15s;
}

.theme-option:hover {
    border-color: var(--accent);
}

.theme-option.active {
    background: var(--nav-active-bg);
    border-color: var(--accent);
    color: var(--accent);
}

.fontsize-controls {
    display: flex;
    gap: 6px;
}

.fontsize-option {
    flex: 1;
    padding: 6px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--sidebar-text);
    font-family: inherit;
    cursor: pointer;
    transition: all 0.15s;
    text-align: center;
}

.fontsize-option:nth-child(1) { font-size: 12px; }
.fontsize-option:nth-child(2) { font-size: 14px; }
.fontsize-option:nth-child(3) { font-size: 17px; }
.fontsize-option:nth-child(4) { font-size: 20px; }

.fontsize-option:hover {
    border-color: var(--accent);
}

.fontsize-option.active {
    background: var(--nav-active-bg);
    border-color: var(--accent);
    color: var(--accent);
}

.fontsize-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 6px;
    padding: 0 2px;
}

.fontsize-labels span {
    font-size: 10px;
    color: var(--sidebar-section-title);
    flex: 1;
    text-align: center;
}

/* Infographic container */
.infographic {
    margin-bottom: 28px;
    padding: 16px;
    background: var(--code-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow-x: auto;
}

.infographic svg {
    width: 100%;
    height: auto;
    max-height: 280px;
}

@media (max-width: 900px) {
    .settings-btn {
        top: 12px;
        right: 12px;
    }

    .settings-panel {
        right: 12px;
        width: calc(100vw - 24px);
        max-width: 300px;
    }

    .infographic {
        padding: 10px;
    }

    .infographic svg {
        min-width: 500px;
    }
}