/* ========================================
   Tutorial Page Specific Styles
   Tutorial页面专用样式
   ======================================== */

/* Tutorial Specific Variables */
:root {
    --sidebar-bg: #fff;
    --sidebar-border: #e5e5e5;
    --nav-active-bg: #e9ecef;
    --nav-hover-bg: #f5f5f5;
    --update-banner-bg: #fff;
    --update-banner-text: #333;
}

html.dark-mode {
    --sidebar-bg: #2c2c2e;
    --sidebar-border: #38383a;
    --nav-active-bg: #3a3a3c;
    --nav-hover-bg: #333335;
    --update-banner-bg: #000;
    --update-banner-text: #fff;
}

/* Box Sizing */
* {
    box-sizing: border-box;
}

/* Layout */
.page-wrapper {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: 280px;
    height: 100vh;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--sidebar-border);
    overflow-y: auto;
    padding: 80px 20px 20px;
    z-index: 100;
    transition: transform 0.3s ease;
}

.sidebar-header {
    padding: 0 10px 20px;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 20px;
}

.sidebar-title {
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--title-color);
    margin: 0;
    border-bottom: none; /* Remove duplicate border, parent has border */
}

.nav-section {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.nav-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    color: var(--text-color);
    text-decoration: none;
    border-radius: 8px;
    transition: background-color 0.2s, color 0.2s;
    font-weight: 500;
    cursor: pointer;
}

.nav-item-text {
    flex: 1;
}

.nav-toggle-btn {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: var(--highlight-bg);
    border: 1px solid var(--border-color);
    color: var(--title-color);
    font-size: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.2s;
    flex-shrink: 0;
    margin-left: 8px;
}

.nav-toggle-btn:hover {
    background-color: var(--border-color);
    transform: scale(1.1);
}

.nav-item:hover {
    background-color: var(--nav-hover-bg);
    color: var(--title-color);
}

.nav-item.active {
    background-color: var(--nav-active-bg);
    color: var(--title-color);
    font-weight: 700;
}

.nav-item.active.has-active-sub {
    background-color: var(--nav-hover-bg);
    opacity: 0.8;
}

/* Sub Navigation */
.nav-sub-items {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-top: 4px;
    padding-left: 16px;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.3s ease, opacity 0.3s ease, margin-top 0.3s ease;
}

.nav-sub-items.expanded {
    max-height: 1000px;
    opacity: 1;
}

.nav-sub-item {
    display: block;
    padding: 8px 12px;
    color: var(--secondary-text-color);
    text-decoration: none;
    border-radius: 6px;
    transition: background-color 0.2s, color 0.2s;
    font-size: 0.9rem;
    font-weight: 400;
    cursor: pointer;
}

.nav-sub-item:hover {
    background-color: var(--nav-hover-bg);
    color: var(--title-color);
}

.nav-sub-item.active {
    background-color: var(--nav-active-bg);
    color: var(--title-color);
    font-weight: 600;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 280px;
    padding: 80px 40px 40px;
    max-width: 1200px;
}

/* Override container for tutorial */
.main-content .container {
    max-width: 800px;
    margin: 0 auto;
}

/* Tutorial Typography */
h1 {
    font-size: 2.5rem;
    color: var(--title-color);
    margin-bottom: 1rem;
    font-weight: 900;
}

h2 {
    font-size: 1.75rem;
    color: var(--title-color);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
    margin-top: 3rem;
    margin-bottom: 1.5rem;
    font-weight: 700;
}

h3 {
    font-size: 1.25rem;
    color: var(--title-color);
    margin-top: 2rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

h4 {
    font-size: 1.1rem;
    color: var(--title-color);
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    font-weight: 600;
}

p, ul, ol, li {
    margin-bottom: 1rem;
    color: var(--secondary-text-color);
}

ul, ol {
    padding-left: 2rem;
}

li {
    margin-bottom: 0.5rem;
}

/* Code Blocks */
code {
    background-color: var(--highlight-bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

pre {
    background-color: var(--highlight-bg);
    padding: 1rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1.5rem 0;
}

pre code {
    background: none;
    padding: 0;
}

/* Blockquote */
blockquote {
    border-left: 4px solid var(--border-color);
    padding-left: 1rem;
    margin: 1.5rem 0;
    font-style: italic;
    color: var(--secondary-text-color);
}

/* Links in Tutorial */
a {
    color: var(--link-color);
    text-decoration: underline;
    transition: color 0.2s;
}

a:hover {
    color: var(--link-hover-color);
}

/* Section */
section {
    margin-bottom: 3rem;
    scroll-margin-top: 80px;
}

section:first-of-type {
    margin-top: 0;
}

/* Menu Toggle (Mobile) */
.menu-toggle {
    position: fixed;
    top: 20px;
    left: 20px;
    padding: 8px 16px;
    background-color: var(--card-bg);
    color: var(--title-color);
    border-radius: 20px;
    box-shadow: 0 4px 12px var(--shadow-color);
    cursor: pointer;
    z-index: 1001;
    font-weight: 700;
    border: none;
    display: none;
    transition: transform 0.2s;
}

.menu-toggle:hover {
    transform: scale(1.05);
}

/* Sidebar Overlay (Mobile) */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 99;
    touch-action: none; /* Prevent scroll on overlay */
}

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

/* Prevent body scroll when sidebar is open on mobile */
body.sidebar-open {
    overflow: hidden;
    position: fixed;
    width: 100%;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        box-shadow: 2px 0 10px var(--shadow-color);
        max-width: 280px;
    }

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

    .main-content {
        margin-left: 0;
        padding: 80px 20px 40px;
        width: 100%;
        max-width: 100%;
        overflow-x: hidden;
    }

    .main-content .container {
        width: 100%;
        max-width: 100%;
        padding: 0;
    }

    /* Mobile: Home and Menu buttons stacked vertically */
    .home-btn {
        display: block;
        top: 20px;
        left: 20px;
    }

    .menu-toggle {
        display: block;
        top: 70px; /* Home button height (40px) + gap (30px) */
        left: 20px;
    }

    h1 {
        font-size: 2rem;
        word-wrap: break-word;
        word-break: break-word;
    }

    h2 {
        font-size: 1.5rem;
        word-wrap: break-word;
        word-break: break-word;
    }

    h3, h4, p, li {
        word-wrap: break-word;
        word-break: break-word;
        overflow-wrap: break-word;
    }

    /* 确保代码块不会导致水平滚动 */
    pre {
        max-width: 100%;
        overflow-x: auto;
    }

    code {
        word-wrap: break-word;
        word-break: break-all;
    }

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