html {
    scroll-behavior: smooth;
}

/* Dark mode variables */
:root {
    --background: #ffffff;
    --text: #363636;
    --border: #dbdbdb;
    --card-background: #ffffff;
    --card-border: #dbdbdb;
}

[data-theme="dark"] {
    --background: #1a1a1a;
    --text: #f5f5f5;
    --border: #363636;
    --card-background: #2a2a2a;
    --card-border: #363636;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: var(--background);
    color: var(--text);
    transition: background-color 0.3s, color 0.3s;
}

/* Dark mode overrides */
[data-theme="dark"] .title,
[data-theme="dark"] .subtitle {
    color: var(--text);
}

[data-theme="dark"] .menu-label {
    color: var(--text);
}

[data-theme="dark"] .menu-list a {
    color: var(--text);
}

[data-theme="dark"] .menu-list a:hover {
    background-color: var(--card-background);
}

[data-theme="dark"] .divider {
    background-color: var(--border);
}

.toc-container {
    position: fixed;
    top: 3rem;
    right: 3rem;
    width: 230px;
    z-index: 100;
}

.toc-content {
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    padding: 0.75rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] .toc-content {
    background-color: rgba(42, 42, 42, 0.8);
}

.toc-content .menu-label {
    font-weight: 600;
    color: #1d1d1f;
    font-size: 0.8rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
    padding-left: 0.5rem;
}

[data-theme="dark"] .toc-content .menu-label {
    color: #f5f5f5;
}

.toc-content .menu-list {
    list-style-type: none;
    padding: 0;
    margin: 0;
}

.toc-content .menu-list li {
    margin-bottom: 0.25rem;
}

.toc-content .menu-list a {
    color: #1d1d1f;
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 400;
    transition: color 0.2s ease, background-color 0.2s ease;
    display: block;
    padding: 0.35rem 0.5rem;
    border-radius: 6px;
    line-height: 1.2;
}

[data-theme="dark"] .toc-content .menu-list a {
    color: #e0e0e0;
}

.toc-content .menu-list a:hover {
    background-color: rgba(0, 0, 0, 0.05);
    color: #06c;
}

[data-theme="dark"] .toc-content .menu-list a:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: #64b5f6;
}

@media screen and (max-width: 1550px) {
    .toc-container {
        display: none;
    }
    
    .dark-mode-toggle {
        position: fixed;
        bottom: 1rem !important;
        right: 1rem !important;
    }
}

.section {
    padding: 2rem 1.5rem;
}

.title, .subtitle {
    font-weight: 300;
}

.content {
    max-width: 1000px;
    margin: 0 auto;
    background-color: var(--background);
    color: var(--text);
}

.divider {
    background-color: #cacaca;
    height: 0.2rem;
}

.video-card {
    margin-bottom: 0rem;
    background-color: var(--card-background);
    border-color: var(--card-border);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
}

.video-card video {
    width: 100%;
    height: auto;
    display: block;
}

.video-card-content {
    padding: 1rem;
}

.video-title {
    font-size: 1.2rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.author-info {
    margin-top: 1.5rem;
}

.author-info a {
    color: inherit;
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: #3273dc;
}

[data-theme="dark"] a:hover {
    color: #64b5f6;
}

.todo {
    color: red;
}

#citation-text {
    height: auto;
    font-size: 0.9em;
    white-space: pre-wrap;
    resize: none;
    background-color: var(--card-background);
    color: var(--text);
    border-color: var(--border);
}

#citation-copy-button {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    background-color: var(--card-background);
    color: var(--text);
    border-color: var(--border);
}

#citation-copy-button:hover {
    background-color: var(--text);
    color: var(--background);
}

#toast {
    position: absolute;
    top: -4rem;
    right: 0.75rem;
    z-index: 1000;
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.dark-mode-toggle {
    position: fixed;
    bottom: 2rem;
    right: 3rem;
    z-index: 1000;
    background-color: var(--card-background);
    color: var(--text);
    border-color: var(--border);
    transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.dark-mode-toggle:hover {
    background-color: var(--text);
    color: var(--background);
}

.button {
    background-color: var(--card-background);
    color: var(--text);
    border-color: var(--border);
    transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

[data-theme="dark"] .button {
    background-color: #363636;
    color: #f5f5f5;
    border-color: #4a4a4a;
}

.button:hover {
    background-color: #fcfcfc;
    color: #363636;
}

[data-theme="dark"] .button:hover {
    background-color: #4a4a4a;
    color: #f5f5f5;
}