/* ==========================================================================
   Tom Elden — Personal Website
   A clean, minimalist design inspired by Daring Fireball
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties
   -------------------------------------------------------------------------- */

:root {
    /* Colour Palette */
    --colour-bg: #505941;
    --colour-bg-dark: #3d4432;
    --colour-text: #f5f5f0;
    --colour-text-muted: #d4d4c8;
    --colour-accent: #a8b89a;

    /* Typography */
    --font-serif: Georgia, 'Times New Roman', Times, serif;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 6rem;

    /* Layout */
    --content-width: 700px;
    --site-padding: 1.5rem;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
}

/* --------------------------------------------------------------------------
   CSS Reset & Base
   -------------------------------------------------------------------------- */

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    font-size: 1.125rem;
    line-height: 1.7;
    color: var(--colour-text);
    background-color: var(--colour-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-serif);
    font-weight: 400;
    line-height: 1.3;
    color: var(--colour-text);
}

h1 {
    font-size: clamp(2.5rem, 5vw + 1rem, 4rem);
    letter-spacing: -0.02em;
}

h2 {
    font-size: 1.5rem;
    margin-bottom: var(--space-sm);
    color: var(--colour-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-family: var(--font-sans);
    font-weight: 500;
    font-size: 0.875rem;
}

p {
    max-width: 38em;
    margin-bottom: var(--space-sm);
}

p:last-child {
    margin-bottom: 0;
}

a {
    color: var(--colour-accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--colour-text);
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */

.site-header {
    padding: var(--space-md) var(--site-padding);
}

.main {
    flex: 1;
    padding: 0 var(--site-padding);
    max-width: calc(var(--content-width) + var(--site-padding) * 2);
    margin: 0 auto;
    width: 100%;
}

.site-footer {
    padding: var(--space-lg) var(--site-padding) var(--space-md);
    margin-top: auto;
}

/* --------------------------------------------------------------------------
   Navigation
   -------------------------------------------------------------------------- */

.nav {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
    max-width: calc(var(--content-width) + var(--site-padding) * 2);
    margin: 0 auto;
    width: 100%;
}

.nav-logo {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    color: var(--colour-text);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.nav-logo:hover {
    color: var(--colour-accent);
}

.nav-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm) var(--space-md);
    list-style: none;
}

.nav-link {
    color: var(--colour-text-muted);
    text-decoration: none;
    font-size: 1rem;
    position: relative;
    padding-bottom: 2px;
}

/* Underline animation - grows from centre */
.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 1px;
    background-color: var(--colour-accent);
    transition: width var(--transition-base), left var(--transition-base);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
    left: 0;
}

.nav-link:hover,
.nav-link.active {
    color: var(--colour-text);
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */

.hero {
    padding: var(--space-xs) 0;
}

.hero-title {
    margin: 0;
}

/* --------------------------------------------------------------------------
   About Section
   -------------------------------------------------------------------------- */

.about {
    padding: var(--space-lg) 0;
}

.about-content {
    padding: var(--space-lg) 0;
}

.about-content p:first-child {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    margin-bottom: var(--space-md);
}

.section-title {
    margin-bottom: var(--space-md);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */

.footer-content {
    max-width: calc(var(--content-width) + var(--site-padding) * 2);
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-md);
}

.social-links {
    display: flex;
    gap: var(--space-sm);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    color: var(--colour-text-muted);
    border-radius: 50%;
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.social-link:hover {
    color: var(--colour-text);
    background-color: var(--colour-bg-dark);
}

.social-link svg {
    width: 20px;
    height: 20px;
}

.copyright {
    font-size: 0.875rem;
    color: var(--colour-text-muted);
    margin: 0;
}

/* --------------------------------------------------------------------------
   Fade-in Animation
   -------------------------------------------------------------------------- */

.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Staggered animation delays */
.fade-in:nth-child(1) { transition-delay: 0.1s; }
.fade-in:nth-child(2) { transition-delay: 0.25s; }
.fade-in:nth-child(3) { transition-delay: 0.4s; }

/* --------------------------------------------------------------------------
   Responsive: Tablet (600px+)
   -------------------------------------------------------------------------- */

@media (min-width: 600px) {
    :root {
        --site-padding: 2rem;
    }

    .nav {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }

    .hero {
        padding: var(--space-sm) 0 var(--space-xs);
    }
}

/* --------------------------------------------------------------------------
   Responsive: Desktop (900px+)
   -------------------------------------------------------------------------- */

@media (min-width: 900px) {
    :root {
        --site-padding: 3rem;
    }

    body {
        font-size: 1.1875rem;
    }

    .hero {
        padding: var(--space-sm) 0 var(--space-xs);
    }

    .about {
        padding: var(--space-xl) 0;
    }
}

/* --------------------------------------------------------------------------
   Blog: Post List
   -------------------------------------------------------------------------- */

.posts-section {
    padding: var(--space-lg) 0;
}

.post-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.post-item {
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--colour-bg-dark);
}

.post-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.post-link {
    text-decoration: none;
}

.post-title {
    font-family: var(--font-serif);
    font-size: clamp(1.5rem, 3vw + 0.5rem, 2rem);
    font-weight: 400;
    color: var(--colour-text);
    margin-bottom: var(--space-xs);
    transition: color var(--transition-fast);
    text-transform: none;
    letter-spacing: normal;
}

.post-link:hover .post-title {
    color: var(--colour-accent);
}

.post-meta {
    display: block;
    font-size: 0.875rem;
    color: var(--colour-text-muted);
    margin-bottom: var(--space-sm);
}

.post-excerpt {
    color: var(--colour-text-muted);
    margin: 0;
    max-width: 38em;
}

.no-posts,
.error {
    color: var(--colour-text-muted);
}

.view-all {
    margin-top: var(--space-lg);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--colour-bg-dark);
}

.view-all a {
    color: var(--colour-text-muted);
    transition: color var(--transition-fast);
}

.view-all a:hover {
    color: var(--colour-accent);
}

/* Home page posts - add top padding */
.post-list--home {
    padding-top: var(--space-lg);
}

/* --------------------------------------------------------------------------
   Blog: Full Post (Home Page)
   -------------------------------------------------------------------------- */

.post-full {
    padding-bottom: var(--space-xl);
    margin-bottom: var(--space-xl);
    border-bottom: 1px solid var(--colour-bg-dark);
}

.post-full:last-of-type {
    border-bottom: none;
    margin-bottom: var(--space-lg);
}

.post-full-header {
    margin-bottom: var(--space-md);
}

.post-full-title {
    font-family: var(--font-serif);
    font-size: clamp(1.75rem, 4vw + 0.5rem, 2.5rem);
    font-weight: 400;
    line-height: 1.2;
    margin-bottom: var(--space-xs);
    text-transform: none;
    letter-spacing: -0.01em;
}

.post-full-title a {
    color: var(--colour-text);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.post-full-title a:hover {
    color: var(--colour-accent);
}

.post-full-date {
    display: block;
    font-size: 0.875rem;
    color: var(--colour-text-muted);
}

/* Full post content - reuse article styles */
.post-full-content {
    max-width: 38em;
}

.post-full-content h2 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--colour-text);
    text-transform: none;
    letter-spacing: normal;
    margin-top: var(--space-lg);
    margin-bottom: var(--space-sm);
}

.post-full-content h3 {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 400;
    color: var(--colour-text);
    margin-top: var(--space-md);
    margin-bottom: var(--space-sm);
}

.post-full-content p {
    margin-bottom: var(--space-sm);
}

.post-full-content a {
    color: var(--colour-accent);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.post-full-content a:hover {
    color: var(--colour-text);
}

.post-full-content ul,
.post-full-content ol {
    margin-bottom: var(--space-sm);
    padding-left: 1.5em;
}

.post-full-content li {
    margin-bottom: var(--space-xs);
}

.post-full-content blockquote {
    margin: var(--space-md) 0;
    padding-left: var(--space-md);
    border-left: 3px solid var(--colour-accent);
    color: var(--colour-text-muted);
    font-style: italic;
}

.post-full-content blockquote p {
    margin-bottom: 0;
}

.post-full-content code {
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, monospace;
    font-size: 0.9em;
    background-color: var(--colour-bg-dark);
    padding: 0.15em 0.4em;
    border-radius: 3px;
}

.post-full-content pre {
    background-color: var(--colour-bg-dark);
    padding: var(--space-sm);
    border-radius: 4px;
    overflow-x: auto;
    margin-bottom: var(--space-sm);
}

.post-full-content pre code {
    background: none;
    padding: 0;
}

.post-full-content hr {
    border: none;
    border-top: 1px solid var(--colour-bg-dark);
    margin: var(--space-lg) 0;
}

.post-full-content img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
    margin: var(--space-sm) 0;
}

/* --------------------------------------------------------------------------
   Blog: Single Article
   -------------------------------------------------------------------------- */

.article {
    padding: var(--space-lg) 0;
}

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

.back-link {
    display: inline-block;
    font-size: 0.875rem;
    color: var(--colour-text-muted);
    margin-bottom: var(--space-md);
    transition: color var(--transition-fast);
}

.back-link:hover {
    color: var(--colour-accent);
}

.article-title {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 4vw + 0.5rem, 3rem);
    font-weight: 400;
    line-height: 1.2;
    margin-bottom: var(--space-sm);
    letter-spacing: -0.01em;
}

.article-date {
    display: block;
    font-size: 0.875rem;
    color: var(--colour-text-muted);
}

/* Article content typography */
.article-content {
    max-width: 38em;
}

.article-content h2 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--colour-text);
    text-transform: none;
    letter-spacing: normal;
    margin-top: var(--space-lg);
    margin-bottom: var(--space-sm);
}

.article-content h3 {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 400;
    color: var(--colour-text);
    margin-top: var(--space-md);
    margin-bottom: var(--space-sm);
}

.article-content p {
    margin-bottom: var(--space-sm);
}

.article-content a {
    color: var(--colour-accent);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.article-content a:hover {
    color: var(--colour-text);
}

.article-content ul,
.article-content ol {
    margin-bottom: var(--space-sm);
    padding-left: 1.5em;
}

.article-content li {
    margin-bottom: var(--space-xs);
}

.article-content blockquote {
    margin: var(--space-md) 0;
    padding-left: var(--space-md);
    border-left: 3px solid var(--colour-accent);
    color: var(--colour-text-muted);
    font-style: italic;
}

.article-content blockquote p {
    margin-bottom: 0;
}

.article-content code {
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, monospace;
    font-size: 0.9em;
    background-color: var(--colour-bg-dark);
    padding: 0.15em 0.4em;
    border-radius: 3px;
}

.article-content pre {
    background-color: var(--colour-bg-dark);
    padding: var(--space-sm);
    border-radius: 4px;
    overflow-x: auto;
    margin-bottom: var(--space-sm);
}

.article-content pre code {
    background: none;
    padding: 0;
}

.article-content hr {
    border: none;
    border-top: 1px solid var(--colour-bg-dark);
    margin: var(--space-lg) 0;
}

.article-content img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
    margin: var(--space-sm) 0;
}

/* --------------------------------------------------------------------------
   Accessibility: Reduced Motion
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }

    .fade-in {
        opacity: 1;
        transform: none;
    }

}