/*
 * LaprdusTTS Website - Main Stylesheet
 * =====================================
 * WCAG 2.1 AA Compliant Color System
 * Atkinson Hyperlegible Font (designed for low vision)
 */

/* CSS Reset - Modern Minimal */
*,
*::before,
*::after {
    box-sizing: border-box;
}

* {
    margin: 0;
    padding: 0;
}

/* CSS Custom Properties - WCAG AA Compliant Colors */
:root {
    /* Primary colors - tested for 4.5:1+ contrast on white */
    --color-primary: #0055a4;
    --color-primary-dark: #003d73;
    --color-primary-light: #e6f0fa;

    /* Text colors - high contrast */
    --color-text: #1a1a1a;
    --color-text-muted: #4a4a4a;
    --color-text-inverse: #ffffff;

    /* Background colors */
    --color-bg: #ffffff;
    --color-bg-alt: #f5f5f5;
    --color-bg-dark: #1a1a1a;

    /* Link colors - distinct and accessible */
    --color-link: #0055a4;
    --color-link-visited: #6b3fa0;
    --color-link-hover: #003d73;

    /* Focus indicator - high visibility */
    --color-focus: #ffb81c;

    /* Status colors */
    --color-success: #2e7d32;
    --color-error: #c62828;

    /* Spacing scale */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-xxl: 3rem;

    /* Typography */
    --font-family: 'Atkinson Hyperlegible', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-base: 1.125rem; /* 18px - better readability */
    --font-size-sm: 1rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --font-size-3xl: 2.5rem;
    --line-height: 1.6;
    --line-height-tight: 1.3;

    /* Layout */
    --container-max: 1200px;
    --container-content: 70ch;

    /* Borders */
    --border-radius: 4px;
    --border-radius-lg: 8px;
}

/* High Contrast Mode Support */
@media (prefers-contrast: more), (prefers-contrast: high) {
    :root {
        --color-text: #000000;
        --color-bg: #ffffff;
        --color-link: #0000ee;
        --color-link-visited: #551a8b;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --color-text: #f0f0f0;
        --color-text-muted: #cccccc;
        --color-text-inverse: #121212;
        --color-bg: #121212;
        --color-bg-alt: #1e1e1e;
        --color-link: #6db3f2;
        --color-link-visited: #b39ddb;
        --color-link-hover: #90caf9;
        --color-primary: #4a9fe8;
        --color-primary-dark: #2d7dc4;
        --color-primary-light: #1e3a5f;
    }
}

/* Base Typography */
html {
    font-size: 100%;
    scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height);
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
    line-height: var(--line-height-tight);
    font-weight: 700;
    margin-bottom: var(--space-md);
}

h1 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--space-lg);
}

h2 {
    font-size: var(--font-size-2xl);
    margin-top: var(--space-xxl);
}

h3 {
    font-size: var(--font-size-xl);
    margin-top: var(--space-xl);
}

h4 {
    font-size: var(--font-size-lg);
    margin-top: var(--space-lg);
}

/* Paragraphs and text */
p {
    margin-bottom: var(--space-md);
    max-width: var(--container-content);
}

/* Links - explicit colors for WCAG compliance */
a {
    color: #0055a4;
    text-decoration: underline;
    text-underline-offset: 0.2em;
    text-decoration-thickness: 1px;
    transition: color 0.2s ease, text-decoration-thickness 0.2s ease;
}

a:visited {
    color: #5c3d7a;
}

a:hover {
    color: #003d73;
    text-decoration-thickness: 2px;
}

@media (prefers-color-scheme: dark) {
    a {
        color: #6db3f2;
    }

    a:visited {
        color: #b39ddb;
    }

    a:hover {
        color: #90caf9;
    }
}

/* Lists */
ul, ol {
    margin-bottom: var(--space-md);
    padding-left: var(--space-xl);
}

li {
    margin-bottom: var(--space-sm);
    max-width: var(--container-content);
}

li::marker {
    color: var(--color-primary);
}

/* Container */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--space-xl);
    }
}

/* Main Content */
main {
    flex: 1;
    padding: var(--space-xl) 0;
}

/* Site Header */
.site-header {
    background-color: var(--color-primary);
    color: var(--color-text-inverse);
    padding: var(--space-md) 0;
}

.site-header .container {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-text-inverse);
    text-decoration: none;
    font-weight: 700;
    font-size: var(--font-size-lg);
}

.logo:hover,
.logo:visited {
    color: var(--color-text-inverse);
}

.logo img {
    width: 40px;
    height: 40px;
}

/* Navigation */
.nav-list {
    display: flex;
    flex-wrap: wrap;
    list-style: none;
    padding: 0;
    margin: 0;
    gap: var(--space-sm);
}

@media (min-width: 768px) {
    .nav-list {
        gap: var(--space-lg);
    }
}

.nav-list a {
    color: var(--color-text-inverse);
    text-decoration: none;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--border-radius);
    display: inline-block;
    min-height: 44px;
    min-width: 44px;
    display: flex;
    align-items: center;
}

.nav-list a:hover {
    background-color: var(--color-primary-dark);
    color: var(--color-text-inverse);
}

.nav-list a:visited {
    color: var(--color-text-inverse);
}

.nav-list a[aria-current="page"] {
    font-weight: 700;
    border-bottom: 3px solid var(--color-text-inverse);
}

/* Site Footer */
.site-footer {
    background-color: #ffffff;
    padding: var(--space-xl) 0;
    margin-top: auto;
    border-top: 1px solid #4a4a4a;
}

.site-footer .container {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

@media (min-width: 768px) {
    .site-footer .container {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }
}

.site-footer nav ul {
    display: flex;
    flex-wrap: wrap;
    list-style: none;
    padding: 0;
    margin: 0;
    gap: var(--space-lg);
}

.copyright,
.license {
    color: var(--color-text-muted);
    margin: 0;
}

/* Footer links with explicit colors for accessibility */
.site-footer a {
    color: #0055a4;
}

.site-footer a:visited {
    color: #5c3d7a;
}

.site-footer a:hover {
    color: #003d73;
}

@media (prefers-color-scheme: dark) {
    .site-footer {
        background-color: var(--color-bg-alt);
        border-top-color: #4a4a4a;
    }

    .site-footer a {
        color: #6db3f2;
    }

    .site-footer a:visited {
        color: #b39ddb;
    }

    .site-footer a:hover {
        color: #90caf9;
    }
}

/* Hero Section */
.hero {
    text-align: center;
    padding: var(--space-xxl) 0;
    background-color: var(--color-primary-light);
    margin-bottom: var(--space-xxl);
    border-radius: var(--border-radius-lg);
}

.hero h1 {
    color: var(--color-primary-dark);
    margin-bottom: var(--space-md);
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-text-muted);
    max-width: none;
}

/* Hero Logo */
.hero-logo {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--color-primary);
    margin-bottom: var(--space-lg);
}

@media (prefers-color-scheme: dark) {
    .hero h1 {
        color: #f0f0f0;
    }
}

/* Feature Grid */
.feature-grid {
    display: grid;
    gap: var(--space-xl);
    margin: var(--space-xxl) 0;
}

@media (min-width: 768px) {
    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.feature-card {
    background-color: var(--color-bg-alt);
    padding: var(--space-xl);
    border-radius: var(--border-radius-lg);
    border: 1px solid transparent;
    transition: border-color 0.2s ease;
}

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

.feature-card h3 {
    margin-top: 0;
    color: var(--color-primary-dark);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--border-radius);
    font-weight: 700;
    font-size: var(--font-size-base);
    text-decoration: none;
    min-height: 44px;
    min-width: 44px;
    cursor: pointer;
    border: 2px solid transparent;
    transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.btn-primary {
    background-color: #0055a4;
    color: #ffffff;
    border-color: #0055a4;
}

.btn-primary:hover,
.btn-primary:visited {
    background-color: #003d73;
    border-color: #003d73;
    color: #ffffff;
}

@media (prefers-color-scheme: dark) {
    .btn-primary {
        background-color: #4a9fe8;
        color: #121212;
        border-color: #4a9fe8;
    }

    .btn-primary:hover,
    .btn-primary:visited {
        background-color: #6db3f2;
        border-color: #6db3f2;
        color: #121212;
    }
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-secondary:hover {
    background-color: var(--color-primary);
    color: var(--color-text-inverse);
}

.btn-secondary:visited {
    color: var(--color-primary);
}

/* Audio Player */
.audio-player {
    background-color: var(--color-bg-alt);
    padding: var(--space-lg);
    border-radius: var(--border-radius-lg);
    margin: var(--space-lg) 0;
}

.audio-player audio {
    width: 100%;
    min-height: 44px;
}

/* Quick Links Grid */
.download-quick-links {
    margin: var(--space-xxl) 0;
}

.quick-links-grid {
    display: grid;
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

@media (min-width: 768px) {
    .quick-links-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.quick-link-item {
    background-color: var(--color-bg-alt);
    padding: var(--space-lg);
    border-radius: var(--border-radius-lg);
    text-align: center;
}

.quick-link-item h3 {
    margin-top: 0;
    margin-bottom: var(--space-md);
    font-size: var(--font-size-lg);
}

/* Collapsible installation instructions */
.download-card details {
    margin-top: var(--space-lg);
}

.download-card summary {
    cursor: pointer;
    font-weight: 700;
    font-size: var(--font-size-xl);
    line-height: var(--line-height-tight);
    margin-bottom: var(--space-md);
    padding: var(--space-sm) 0;
}

.download-card details[open] summary {
    margin-bottom: var(--space-md);
}

/* Download Cards */
.download-section {
    margin: var(--space-xxl) 0;
}

.download-card {
    background-color: #ffffff;
    padding: var(--space-xl);
    border-radius: var(--border-radius-lg);
    margin-bottom: var(--space-xl);
    border: 1px solid #4a4a4a;
    border-left-width: 4px;
    border-left-color: #0055a4;
}

.download-card a:not(.btn) {
    color: #0055a4;
}

.download-card a:not(.btn):visited {
    color: #5c3d7a;
}

.download-card a:not(.btn):hover {
    color: #003d73;
}

@media (prefers-color-scheme: dark) {
    .download-card {
        background-color: var(--color-bg-alt);
        border-color: #4a4a4a;
        border-left-color: var(--color-primary);
    }

    .download-card a:not(.btn) {
        color: #6db3f2;
    }

    .download-card a:not(.btn):visited {
        color: #b39ddb;
    }

    .download-card a:not(.btn):hover {
        color: #90caf9;
    }
}

.download-card h3 {
    margin-top: 0;
}

.download-meta {
    display: block;
    margin: var(--space-md) 0;
    color: var(--color-text);
    background-color: transparent;
    font-size: var(--font-size-base);
}

.download-meta div {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    color: var(--color-text);
    background-color: transparent;
}

.download-meta dt {
    font-weight: 700;
    color: var(--color-text);
    background-color: transparent;
}

.download-meta dd {
    margin: 0;
    color: var(--color-text);
    background-color: transparent;
}

/* Requirements List */
.requirements-list {
    background-color: var(--color-bg);
    padding: var(--space-md);
    border-radius: var(--border-radius);
    margin: var(--space-md) 0;
}

.requirements-list h4 {
    margin-top: 0;
    font-size: var(--font-size-base);
}

.requirements-list ul {
    margin-bottom: 0;
}

/* Table of Contents */
.toc {
    background-color: var(--color-bg-alt);
    padding: var(--space-xl);
    border-radius: var(--border-radius-lg);
    margin: var(--space-xl) 0;
}

.toc h2 {
    margin-top: 0;
    font-size: var(--font-size-lg);
}

.toc ol {
    margin-bottom: 0;
}

.toc a {
    text-decoration: none;
}

.toc a:hover {
    text-decoration: underline;
}

/* Content Sections */
.content-section {
    margin: var(--space-xxl) 0;
    padding-top: var(--space-xl);
    border-top: 1px solid var(--color-bg-alt);
}

.content-section:first-of-type {
    border-top: none;
    padding-top: 0;
}

/* Code blocks */
code {
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    background-color: var(--color-bg-alt);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--border-radius);
    font-size: 0.9em;
}

pre {
    background-color: var(--color-bg-alt);
    padding: var(--space-md);
    border-radius: var(--border-radius);
    overflow-x: auto;
    margin: var(--space-md) 0;
}

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

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--space-lg) 0;
}

th, td {
    padding: var(--space-md);
    text-align: left;
    border-bottom: 1px solid var(--color-text-muted);
    color: var(--color-text);
    background-color: var(--color-bg);
}

th {
    background-color: var(--color-bg-alt);
    font-weight: 700;
    color: var(--color-text);
}

/* Keyboard shortcuts */
kbd {
    display: inline-block;
    padding: var(--space-xs) var(--space-sm);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    background-color: var(--color-bg-alt);
    border: 1px solid var(--color-text-muted);
    border-radius: var(--border-radius);
    box-shadow: 0 1px 0 var(--color-text-muted);
}

/* Info boxes */
.info-box {
    padding: var(--space-lg);
    border-radius: var(--border-radius);
    margin: var(--space-lg) 0;
    border-left: 4px solid #0055a4;
    background-color: #ffffff;
}

.info-box p:last-child {
    margin-bottom: 0;
}

.info-box a {
    color: #0055a4;
    background-color: transparent;
}

.info-box a:visited {
    color: #5c3d7a;
}

.info-box a:hover {
    color: #003d73;
}

@media (prefers-color-scheme: dark) {
    .info-box {
        background-color: var(--color-bg-alt);
        border-left-color: var(--color-primary);
    }

    .info-box a {
        color: #6db3f2;
    }

    .info-box a:visited {
        color: #b39ddb;
    }

    .info-box a:hover {
        color: #90caf9;
    }
}

/* External link indicator - uses mask-image so icon inherits currentColor */
a[target="_blank"]::after {
    content: "";
    display: inline-block;
    width: 0.8em;
    height: 0.8em;
    margin-left: 0.25em;
    background-color: currentColor;
    -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2'%3E%3Cpath d='M18 13v6a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h6'/%3E%3Cpolyline points='15,3 21,3 21,9'/%3E%3Cline x1='10' y1='14' x2='21' y2='3'/%3E%3C/svg%3E");
    mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2'%3E%3Cpath d='M18 13v6a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h6'/%3E%3Cpolyline points='15,3 21,3 21,9'/%3E%3Cline x1='10' y1='14' x2='21' y2='3'/%3E%3C/svg%3E");
    -webkit-mask-size: contain;
    mask-size: contain;
    -webkit-mask-repeat: no-repeat;
    mask-repeat: no-repeat;
}

/* News/Blog Posts */
.news-post {
    background-color: #ffffff;
    padding: var(--space-xl);
    border-radius: var(--border-radius-lg);
    margin-bottom: var(--space-xxl);
    border: 1px solid #4a4a4a;
    border-left-width: 4px;
    border-left-color: #0055a4;
}

.news-date {
    display: block;
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-sm);
}

.news-post h2 {
    margin-top: 0;
}

.news-post a:not(.btn) {
    color: #0055a4;
}

.news-post a:not(.btn):visited {
    color: #5c3d7a;
}

.news-post a:not(.btn):hover {
    color: #003d73;
}

.news-notes {
    padding: var(--space-lg);
    border-radius: var(--border-radius);
    margin: var(--space-lg) 0;
    border-left: 4px solid #0055a4;
    background-color: var(--color-bg-alt);
}

.news-notes h3 {
    margin-top: 0;
}

.news-notes ul {
    margin-bottom: 0;
}

@media (prefers-color-scheme: dark) {
    .news-post {
        background-color: var(--color-bg-alt);
        border-color: #4a4a4a;
        border-left-color: var(--color-primary);
    }

    .news-post a:not(.btn) {
        color: #6db3f2;
    }

    .news-post a:not(.btn):visited {
        color: #b39ddb;
    }

    .news-post a:not(.btn):hover {
        color: #90caf9;
    }

    .news-notes {
        border-left-color: var(--color-primary);
    }
}

/* Donate Section */
.donate-section {
    background-color: var(--color-primary-light);
    padding: var(--space-xxl);
    border-radius: var(--border-radius-lg);
    margin-top: var(--space-xxl);
}

.donate-section p {
    margin-left: auto;
    margin-right: auto;
}

.donate-section h2 {
    margin-top: 0;
    color: var(--color-primary-dark);
}

@media (prefers-color-scheme: dark) {
    .donate-section h2 {
        color: #f0f0f0;
    }
}

/* Suppress external link icon on buttons */
.btn[target="_blank"]::after {
    display: none;
}

/* Utility classes */
.text-center {
    text-align: center;
}

.mt-0 {
    margin-top: 0;
}

.mb-0 {
    margin-bottom: 0;
}

.mb-lg {
    margin-bottom: var(--space-lg);
}

.mb-xl {
    margin-bottom: var(--space-xl);
}