/* Universal Notes & Technical Discussion Theme */
:root {
    --bg-page: #ffffff;
    --text-page: #24292e;
    --text-heading: #1a1f2c;
    --border-color: #eaecef;
    --border-subtle: #dfe2e5;
    --bg-table-header: #f6f8fa;
    --bg-table-alt: #fcfcfc;
    --bg-code: #f3f4f6;
    --text-code: #b91c1c;
    --bg-pre: #f6f8fa;
    --text-pre: #24292e;
    --link-color: #0969da;
    --accent-blue: #2563eb;
    --accent-red: #e11d48;
    --nav-bg: #f6f8fa;
    --nav-border: #e1e4e8;
    --nav-text: #24292e;
    --nav-active-text: #111827;
    --btn-code-bg: #f1f5f9;
    --btn-code-border: #cbd5e1;
    --btn-code-text: #0969da;
    --btn-code-hover-bg: #0969da;
    --btn-code-hover-text: #ffffff;
    --blockquote-bg: #f7fafc;
    --blockquote-text: #4a5568;
    --copy-btn-bg: #e2e8f0;
    --copy-btn-border: #cbd5e1;
    --copy-btn-text: #334155;
    --theme-btn-bg: #ffffff;
    --theme-btn-border: #cbd5e1;
    --theme-btn-text: #1e293b;
    --theme-btn-hover: #f1f5f9;
    --callout-info-bg: #f8fafc;
    --callout-info-border: #cbd5e1;
    --callout-info-accent: #2563eb;
    --callout-info-title: #1e40af;
    --callout-success-bg: #f0fdf4;
    --callout-success-border: #bbf7d0;
    --callout-success-accent: #16a34a;
    --callout-success-title: #15803d;
}

[data-theme="dark"] {
    --bg-page: #0d1117;
    --text-page: #c9d1d9;
    --text-heading: #f0f6fc;
    --border-color: #30363d;
    --border-subtle: #21262d;
    --bg-table-header: #161b22;
    --bg-table-alt: #0d1117;
    --bg-code: #161b22;
    --text-code: #f87171;
    --bg-pre: #161b22;
    --text-pre: #e6edf3;
    --link-color: #58a6ff;
    --accent-blue: #388bfd;
    --accent-red: #f85149;
    --nav-bg: #161b22;
    --nav-border: #30363d;
    --nav-text: #c9d1d9;
    --nav-active-text: #58a6ff;
    --btn-code-bg: #21262d;
    --btn-code-border: #30363d;
    --btn-code-text: #58a6ff;
    --btn-code-hover-bg: #1f6feb;
    --btn-code-hover-text: #ffffff;
    --blockquote-bg: #161b22;
    --blockquote-text: #8b949e;
    --copy-btn-bg: #21262d;
    --copy-btn-border: #30363d;
    --copy-btn-text: #c9d1d9;
    --theme-btn-bg: #21262d;
    --theme-btn-border: #30363d;
    --theme-btn-text: #f0f6fc;
    --theme-btn-hover: #30363d;
    --callout-info-bg: #161b22;
    --callout-info-border: #30363d;
    --callout-info-accent: #388bfd;
    --callout-info-title: #58a6ff;
    --callout-success-bg: #0d1e15;
    --callout-success-border: #1b472e;
    --callout-success-accent: #22c55e;
    --callout-success-title: #4ade80;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg-page: #0d1117;
        --text-page: #c9d1d9;
        --text-heading: #f0f6fc;
        --border-color: #30363d;
        --border-subtle: #21262d;
        --bg-table-header: #161b22;
        --bg-table-alt: #0d1117;
        --bg-code: #161b22;
        --text-code: #f87171;
        --bg-pre: #161b22;
        --text-pre: #e6edf3;
        --link-color: #58a6ff;
        --accent-blue: #388bfd;
        --accent-red: #f85149;
        --nav-bg: #161b22;
        --nav-border: #30363d;
        --nav-text: #c9d1d9;
        --nav-active-text: #58a6ff;
        --btn-code-bg: #21262d;
        --btn-code-border: #30363d;
        --btn-code-text: #58a6ff;
        --btn-code-hover-bg: #1f6feb;
        --btn-code-hover-text: #ffffff;
        --blockquote-bg: #161b22;
        --blockquote-text: #8b949e;
        --copy-btn-bg: #21262d;
        --copy-btn-border: #30363d;
        --copy-btn-text: #c9d1d9;
        --theme-btn-bg: #21262d;
        --theme-btn-border: #30363d;
        --theme-btn-text: #f0f6fc;
        --theme-btn-hover: #30363d;
        --callout-info-bg: #161b22;
        --callout-info-border: #30363d;
        --callout-info-accent: #388bfd;
        --callout-info-title: #58a6ff;
        --callout-success-bg: #0d1e15;
        --callout-success-border: #1b472e;
        --callout-success-accent: #22c55e;
        --callout-success-title: #4ade80;
    }
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-page);
    max-width: 920px;
    margin: 36px auto;
    padding: 0 24px;
    background-color: var(--bg-page);
    transition: background-color 0.2s ease, color 0.2s ease;
}

h1, h2, h3, h4 {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.3em;
    color: var(--text-heading);
}

h1 { font-size: 1.95em; margin-bottom: 16px; }
h2 { font-size: 1.45em; margin-top: 28px; margin-bottom: 14px; }
h3 { font-size: 1.2em; margin-top: 20px; margin-bottom: 10px; }
h4 { font-size: 1.05em; margin-top: 16px; margin-bottom: 8px; }

table {
    border-collapse: collapse;
    width: 100%;
    margin: 18px 0;
    font-size: 0.92rem;
}

table th, table td {
    border: 1px solid var(--border-subtle);
    padding: 9px 13px;
    text-align: left;
}

table th {
    background-color: var(--bg-table-header);
    color: var(--text-heading);
    font-weight: 600;
}

table tr:nth-child(2n) {
    background-color: var(--bg-table-alt);
}

blockquote {
    margin: 18px 0;
    padding: 10px 18px;
    color: var(--blockquote-text);
    background-color: var(--blockquote-bg);
    border-left: 4px solid var(--accent-blue);
    border-radius: 3px;
    border-top: 1px solid var(--border-color);
    border-right: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

blockquote p {
    margin: 4px 0;
}

/* Strategic Follow-Up Hook Box (Theme Adaptive) */
.callout-box {
    padding: 12px 16px;
    margin: 16px 0;
    border-radius: 6px;
    border: 1px solid var(--callout-success-border);
    border-left: 4px solid var(--callout-success-accent);
    background-color: var(--callout-success-bg);
    color: var(--text-page);
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

.callout-box h3, .callout-box h4 {
    margin-top: 0;
    margin-bottom: 6px;
    border-bottom: none;
    padding-bottom: 0;
    color: var(--callout-success-title);
    font-size: 1.05rem;
}

.callout-box p {
    margin: 4px 0;
    color: var(--text-page);
}

.callout-box em, .callout-box strong {
    color: var(--text-heading);
}

/* Subsection Follow-Up Hook Box (Theme Adaptive) */
.followup-hook-box {
    padding: 10px 14px;
    margin: 12px 0;
    border-radius: 6px;
    border: 1px solid var(--callout-info-border);
    border-left: 4px solid var(--callout-info-accent);
    background-color: var(--callout-info-bg);
    color: var(--text-page);
    line-height: 1.55;
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

.followup-hook-box strong {
    color: var(--callout-info-title);
}

.followup-hook-box em {
    color: var(--text-heading);
}

code {
    background-color: var(--bg-code);
    padding: 0.2em 0.4em;
    border-radius: 4px;
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 86%;
    color: var(--text-code);
}

/* Code Links: Assimilated inline button appearance */
a.code-link,
a[href*="code.html"]:not(.nav-bar a) {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background-color: var(--btn-code-bg);
    color: var(--btn-code-text);
    border: 1px solid var(--btn-code-border);
    border-radius: 4px;
    padding: 1px 6px;
    margin: 0 2px;
    font-size: 0.85em;
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-weight: 600;
    text-decoration: none;
    vertical-align: baseline;
    transition: all 0.15s ease;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

a.code-link:hover,
a[href*="code.html"]:not(.nav-bar a):hover {
    background-color: var(--btn-code-hover-bg);
    color: var(--btn-code-hover-text);
    border-color: var(--btn-code-hover-bg);
    text-decoration: none;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
}

a.code-link::before,
a[href*="code.html"]:not(.nav-bar a)::before {
    content: "💻";
    font-size: 0.82em;
}

/* Assimilate code tags inside code-link buttons */
a.code-link code,
a[href*="code.html"]:not(.nav-bar a) code {
    background: transparent !important;
    background-color: transparent !important;
    color: inherit !important;
    padding: 0 !important;
    border: none !important;
    border-radius: 0 !important;
    font-size: inherit !important;
    font-family: inherit !important;
    font-weight: inherit !important;
}

/* Prevent outer code wrapper from coloring the button */
code:has(> a.code-link),
code:has(> a[href*="code.html"]) {
    background: transparent !important;
    background-color: transparent !important;
    padding: 0 !important;
    border: none !important;
    color: inherit !important;
}

pre {
    background-color: var(--bg-pre);
    padding: 14px 18px;
    border-radius: 6px;
    overflow-x: auto;
    line-height: 1.45;
    border: 1px solid var(--border-color);
    position: relative;
    margin: 16px 0;
}

pre code {
    background-color: transparent;
    padding: 0;
    color: var(--text-pre);
    font-size: 0.88rem;
}

pre code.hljs {
    background-color: transparent !important;
    padding: 0 !important;
}

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

a:hover {
    text-decoration: underline;
}

/* Nav Bar */
.nav-bar {
    background-color: var(--nav-bg);
    border: 1px solid var(--nav-border);
    color: var(--nav-text);
    border-radius: 6px;
    padding: 10px 16px;
    margin-bottom: 24px;
    font-size: 13.5px;
    line-height: 1.8;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 4px;
}

.nav-bar a {
    margin-right: 6px;
    margin-left: 6px;
    font-weight: 500;
}

.nav-bar a.nav-active {
    font-weight: 700;
    color: var(--nav-active-text);
    border-bottom: 2px solid var(--accent-blue);
    padding-bottom: 2px;
}

/* Sun/Moon Theme Toggle Button */
.theme-toggle-btn {
    background: var(--theme-btn-bg);
    border: 1px solid var(--theme-btn-border);
    color: var(--theme-btn-text);
    border-radius: 20px;
    padding: 3px 10px;
    font-size: 0.84rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    transition: all 0.15s ease;
    user-select: none;
    line-height: 1.3;
}

.theme-toggle-btn:hover {
    background: var(--theme-btn-hover);
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.nav-bar .theme-toggle-btn {
    margin-left: auto;
}

.floating-theme-btn {
    position: fixed;
    top: 16px;
    right: 20px;
    z-index: 1000;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

hr {
    height: 1px;
    background-color: var(--border-color);
    border: none;
    margin: 24px 0;
}

/* Copy button for code blocks */
.copy-code-btn {
    position: absolute;
    top: 6px;
    right: 8px;
    font-size: 0.72rem;
    padding: 2px 7px;
    background: var(--copy-btn-bg);
    color: var(--copy-btn-text);
    border: 1px solid var(--copy-btn-border);
    border-radius: 4px;
    cursor: pointer;
    opacity: 0.7;
    transition: opacity 0.15s, background 0.15s;
}

pre:hover .copy-code-btn {
    opacity: 1;
}

.copy-code-btn:hover {
    filter: brightness(0.92);
}

@media (max-width: 640px) {
    body {
        padding: 0 16px;
        margin: 20px auto;
    }
    table {
        display: block;
        overflow-x: auto;
    }
}