/* KI-Seminar – site.css */

/* Font */
@font-face {
    font-family: 'Avenir';
    src: local('Avenir'), local('Avenir-Roman');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'Avenir';
    src: local('Avenir-Heavy'), local('Avenir Heavy');
    font-weight: 700;
    font-style: normal;
    font-display: swap;
}

/* Design Tokens – Light (default) */
:root {
    --color-bg: #fff;
    --color-bg-code: #f5f5f5;
    --color-text: #111;
    --color-text-secondary: #666;
    --color-text-muted: #555;
    --color-h1: #2F6592;
    --color-h2: #966489;
    --color-accent: #966489;
    --color-border: #e5e5e5;
}

/* Design Tokens – Dark */
@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #1a1a1a;
        --color-bg-code: #2d2d2d;
        --color-text: #f5f5f5;
        --color-text-secondary: #d4d4d4;
        --color-text-muted: #a8a8a8;
        --color-h1: #7fa8d1;
        --color-h2: #c794bb;
        --color-accent: #c794bb;
        --color-border: #404040;
    }
}

[data-theme="dark"] {
    --color-bg: #1a1a1a;
    --color-bg-code: #2d2d2d;
    --color-text: #f5f5f5;
    --color-text-secondary: #d4d4d4;
    --color-text-muted: #a8a8a8;
    --color-h1: #7fa8d1;
    --color-h2: #c794bb;
    --color-accent: #c794bb;
    --color-border: #404040;
}

[data-theme="light"] {
    --color-bg: #fff;
    --color-bg-code: #f5f5f5;
    --color-text: #111;
    --color-text-secondary: #666;
    --color-text-muted: #555;
    --color-h1: #2F6592;
    --color-h2: #966489;
    --color-accent: #966489;
    --color-border: #e5e5e5;
}

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

/* Body – fluid base font: 1rem @320px → 1.25rem @1200px */
body {
    font-family: 'Avenir', Montserrat, Corbel, 'URW Gothic', source-sans-pro, sans-serif;
    font-size: clamp(1rem, 0.909rem + 0.284vw, 1.25rem);
    line-height: 1.7;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Header */
.site-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 52rem;
    margin: 0 auto;
    padding: 1.5rem 1.5rem 1rem;
    border-bottom: 1px solid var(--color-border);
}

.site-logo img { height: 28px; display: block; }

.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--color-text);
    padding: 0.25rem;
}

.site-nav a {
    color: var(--color-text);
    font-size: 0.875em;
    margin-left: 1.5rem;
    text-decoration: none;
}

.site-nav a:hover { color: var(--color-accent); }

/* Main */
.site-main {
    max-width: 52rem;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* Typography – Modular Scale (Perfect Fourth ~1.333) */
.site-main h1 {
    font-size: clamp(1.8rem, 1.2rem + 1.875vw, 2.8rem);
    line-height: 1.15;
    font-weight: 700;
    color: var(--color-h1);
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
    text-wrap: balance;
}

.site-main h2 {
    font-size: clamp(1.35rem, 0.975rem + 1.172vw, 2.1rem);
    line-height: 1.2;
    font-weight: 700;
    color: var(--color-h2);
    margin-top: 2em;
    margin-bottom: 0.75em;
    text-wrap: balance;
}

.site-main h3 {
    font-size: clamp(1.1rem, 0.875rem + 0.703vw, 1.575rem);
    line-height: 1.3;
    font-weight: 600;
    margin-top: 1.75em;
    margin-bottom: 0.5em;
}

.site-main h4 {
    font-size: 1em;
    font-weight: 600;
    margin-top: 1.5em;
    margin-bottom: 0.5em;
}

/* Prose */
.site-main p {
    margin-bottom: 1em;
    text-wrap: pretty;
}

.site-main ul, .site-main ol {
    margin-bottom: 1em;
    padding-left: 1.5em;
}

.site-main li { margin-bottom: 0.35em; }

.site-main li > ul,
.site-main li > ol { margin-top: 0.35em; margin-bottom: 0; }

.site-main blockquote {
    border-left: 3px solid var(--color-accent);
    padding-left: 1em;
    margin: 1.5em 0;
    color: var(--color-text-muted);
    font-style: italic;
}

.site-main code {
    background: var(--color-bg-code);
    padding: 0.15em 0.35em;
    border-radius: 3px;
    font-size: 0.875em;
}

.site-main pre {
    background: var(--color-bg-code);
    padding: 1em;
    border-radius: 4px;
    overflow-x: auto;
    margin-bottom: 1.5em;
    font-size: 0.875em;
    line-height: 1.5;
}

.site-main pre code {
    background: none;
    padding: 0;
}

.site-main table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1.5em;
    font-size: 0.9375em;
}

.site-main th, .site-main td {
    text-align: left;
    padding: 0.5em 0.75em;
    border-bottom: 1px solid var(--color-border);
}

.site-main th { font-weight: 600; }

.site-main img {
    max-width: 100%;
    height: auto;
}

.site-main hr {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: 2.5em 0;
}

/* Footer */
.site-footer {
    max-width: 52rem;
    margin: 0 auto;
    padding: 1em 1.5rem;
    margin-top: 2em;
    border-top: 1px solid var(--color-border);
    font-size: 0.85em;
    color: var(--color-text-secondary);
}

.site-footer a { color: var(--color-text-secondary); }
.site-footer a:hover { color: var(--color-accent); }

/* Mobile */
@media (max-width: 768px) {
    .nav-toggle { display: block; }

    .site-header {
        flex-wrap: wrap;
        padding: 1rem 1rem 0.75rem;
    }

    .site-nav {
        display: none;
        width: 100%;
        padding: 0.75rem 0;
    }

    .site-nav.open { display: block; }

    .site-nav a {
        display: block;
        margin: 0;
        padding: 0.5rem 0;
    }

    .site-main { padding: 1.5rem 1rem; }
    .site-footer { padding: 1rem; }
}