/* ================================
   Font Face Declarations
   ================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap');

@font-face {
    font-family: 'Berkeley Mono';
    src: url('fonts/BerkeleyMonoTrial-Regular.otf') format('opentype');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

/* ================================
   Design Tokens & CSS Variables
   ================================ */

:root {
    /* Colors - Theme-based (will be overridden by JS) */
    --color-base: #fffcf0;
    --color-accent: #000000;
    --color-accent-50: rgba(0, 0, 0, 0.5);

    /* Derived colors */
    --color-bg: var(--color-base);
    --color-text-primary: var(--color-accent);
    --color-text-secondary: var(--color-accent-50);
    --color-divider: var(--color-accent-50);

    /* Typography */
    --font-mono: 'Berkeley Mono', 'Berkeley Mono Variable', 'IBM Plex Mono', 'Courier Prime', 'Courier New', monospace;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Font Sizes */
    --font-size-hero: 36px;
    --font-size-section-header: 26px;
    --font-size-role: 19px;
    --font-size-body: 14px;
    --font-size-small: 15px;
    --font-size-meta: 14px;

    /* Spacing */
    --spacing-section: 90px;
    --spacing-content: 40px;
    --spacing-small: 20px;
    --spacing-xs: 10px;

    /* Layout */
    --max-width: 1400px;
    --column-gap: 60px;
    --line-height-tight: 1.4;
    --line-height-normal: 1.8;
    --letter-spacing: 0.015em;
}

/* Mobile adjustments */
@media (max-width: 768px) {
    :root {
        --font-size-hero: 28px;
        --font-size-section-header: 22px;
        --font-size-role: 17px;
        --font-size-body: 14px;
        --spacing-section: 60px;
        --spacing-content: 30px;
    }
}

/* ================================
   Reset & Base Styles
   ================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-mono);
    font-size: var(--font-size-body);
    line-height: var(--line-height-normal);
    letter-spacing: var(--letter-spacing);
    color: var(--color-text-primary);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ================================
   Layout & Container
   ================================ */

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 60px 40px;
}

/* ================================
   Three Column Grid
   ================================ */

.three-column-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: var(--column-gap);
    margin-top: calc(var(--spacing-content) + 100px);
}

.column h1:first-child {
    font-size: var(--font-size-section-header);
    margin-bottom: var(--spacing-content);
    margin-top: 0;
    padding-bottom: var(--spacing-small);
    border-bottom: 1px solid var(--color-divider);
}

/* Mobile: Stack columns vertically */
@media (max-width: 1024px) {
    .three-column-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-section);
        margin-top: var(--spacing-content);
    }
}

@media (max-width: 768px) {
    .container {
        padding: 40px 20px;
    }
}

/* ================================
   Typography
   ================================ */

h1, h2, h3, h4, h5, h6 {
    font-weight: 400;
    line-height: var(--line-height-tight);
}

h1 {
    font-family: var(--font-sans);
    font-size: var(--font-size-hero);
    margin-bottom: var(--spacing-xs);
}

h2 {
    font-size: var(--font-size-section-header);
    margin-bottom: var(--spacing-small);
    margin-top: var(--spacing-content);
}

h3 {
    font-size: var(--font-size-role);
    margin-bottom: var(--spacing-xs);
    margin-top: var(--spacing-small);
}

p {
    margin-bottom: var(--spacing-small);
}

/* Links */
a {
    color: var(--color-accent);
    text-decoration: underline;
    transition: opacity 0.2s ease;
}

a::after {
    content: ' ↗︎';
}

a:hover {
    opacity: 0.7;
}

/* Lists */
ul, ol {
    margin-left: 20px;
    margin-bottom: var(--spacing-small);
}

li {
    margin-bottom: var(--spacing-xs);
}

/* Strong/Bold */
strong {
    font-weight: 700;
}

/* Horizontal Rule */
hr {
    border: none;
    border-top: 1px solid var(--color-divider);
    margin: var(--spacing-content) 0;
}

/* ================================
   Header
   ================================ */

.site-header {
    margin-bottom: var(--spacing-content);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-title {
    font-size: var(--font-size-body);
    margin-bottom: 0;
    color: var(--color-text-primary);
    text-decoration: none;
    transition: opacity 0.2s ease;
}

.site-title::after {
    content: none;
}

.site-title:hover {
    opacity: 0.7;
}

.site-nav {
    display: flex;
    gap: var(--spacing-small);
    align-items: center;
}

.site-nav a {
    font-size: var(--font-size-body);
    color: var(--color-text-primary);
    text-decoration: none;
    transition: opacity 0.2s ease;
}

.site-nav a::after {
    content: none;
}

.site-nav a:hover {
    opacity: 0.7;
}

.site-nav a.active {
    text-decoration: underline;
}

.theme-switcher {
    background: none;
    border: none;
    cursor: pointer;
    margin-left: var(--spacing-xs);
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.theme-switcher svg {
    width: 16px;
    height: 16px;
    stroke: var(--color-accent);
    transition: stroke 0.3s ease, transform 0.2s ease;
    flex-shrink: 0;
}

.theme-preview {
    display: flex;
    gap: 0;
}

.theme-preview-square {
    width: 8px;
    height: 8px;
    transition: background-color 0.3s ease;
}

.theme-switcher:hover svg {
    transform: scale(1.3) rotate(2deg);
}

.theme-switcher:active svg {
    transform: scale(0.9);
}

/* ================================
   Column Content Styles
   ================================ */

/* About Column */
#about p {
    margin-bottom: var(--spacing-small);
}

#about img {
    width: 100%;
    height: auto;
    display: block;
    margin-top: var(--spacing-content);
    border-radius: 12px;
}

/* Writing Column */
#writing h1 {
    margin-bottom: var(--spacing-content);
}

#writing h3 {
    font-size: var(--font-size-body);
    margin-top: var(--spacing-content);
    margin-bottom: 5px;
}

#writing h3:first-of-type {
    margin-top: 0;
}

#writing em {
    display: block;
    color: var(--color-text-secondary);
    font-size: var(--font-size-meta);
    font-style: normal;
    margin-bottom: var(--spacing-xs);
}

#writing p {
    margin-bottom: var(--spacing-small);
    color: var(--color-text-secondary);
}

/* Experience Column */
#experience h1 {
    margin-bottom: var(--spacing-content);
}

.experience-entry {
    margin-bottom: var(--spacing-small);
}

.experience-title-row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 5px;
}

.experience-title {
    font-size: var(--font-size-body);
    color: var(--color-text-primary);
}

.experience-date {
    font-size: var(--font-size-body);
    color: var(--color-text-secondary);
}

.experience-company {
    font-size: var(--font-size-body);
    color: var(--color-text-secondary);
}

#experience hr {
    margin: var(--spacing-content) 0;
}

/* ================================
   Work Page Styles
   ================================ */

.work-content {
    max-width: 800px;
    margin: 0 auto;
}

.work-content h1 {
    font-size: var(--font-size-hero);
    margin-bottom: var(--spacing-content);
    padding-bottom: var(--spacing-small);
    border-bottom: 1px solid var(--color-divider);
}

.work-entry {
    margin-bottom: var(--spacing-section);
}

.work-entry:last-child {
    margin-bottom: 0;
}

.work-image {
    width: 100%;
    height: auto;
    display: block;
    margin-bottom: var(--spacing-small);
    background-color: var(--color-divider);
    border-radius: 12px;
}

.work-entry h3 {
    font-size: var(--font-size-role);
    margin-top: 0;
    margin-bottom: 5px;
}

.work-date {
    font-size: var(--font-size-body);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.work-description {
    font-size: var(--font-size-body);
    line-height: var(--line-height-normal);
    margin-bottom: 0;
}

/* ================================
   Bookshelf Page Styles
   ================================ */

.bookshelf-content {
    max-width: 800px;
    margin: 0 auto;
}

.bookshelf-content h1 {
    font-size: var(--font-size-hero);
    margin-bottom: var(--spacing-content);
    padding-bottom: var(--spacing-small);
    border-bottom: 1px solid var(--color-divider);
}

.bookshelf-content h2 {
    font-size: var(--font-size-section);
    margin-top: var(--spacing-section);
    margin-bottom: var(--spacing-content);
    padding-bottom: var(--spacing-xs);
    border-bottom: 1px solid var(--color-divider);
}

.bookshelf-content h2:first-of-type {
    margin-top: 0;
}

.book-entry {
    display: flex;
    gap: var(--spacing-content);
    margin-bottom: var(--spacing-content);
    align-items: flex-start;
}

.book-cover {
    flex-shrink: 0;
    width: 80px;
    height: auto;
    border-radius: 4px;
    box-shadow: 0 2px 8px var(--color-accent-50);
}

.book-info {
    flex: 1;
    min-width: 0;
}

.book-info h3 {
    font-size: var(--font-size-role);
    margin: 0 0 5px 0;
}

.book-author {
    font-size: var(--font-size-body);
    color: var(--color-text-secondary);
    margin: 0;
}

@media (max-width: 768px) {
    .book-entry {
        gap: var(--spacing-small);
    }

    .book-cover {
        width: 60px;
    }
}

/* ================================
   Footer
   ================================ */

.site-footer {
    margin-top: var(--spacing-section);
    padding-top: var(--spacing-content);
    border-top: 1px solid var(--color-divider);
}

.footer-links {
    display: flex;
    gap: var(--spacing-small);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-small);
}

.footer-links a {
    font-size: var(--font-size-small);
    color: var(--color-text-secondary);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: var(--spacing-small);
}

.footer-made-with {
    font-size: var(--font-size-meta);
    color: var(--color-text-secondary);
    margin: 0;
}

.footer-updated {
    font-size: var(--font-size-meta);
    color: var(--color-text-secondary);
    margin: 0;
}

/* ================================
   Page Transitions
   ================================ */

@keyframes fadeInUp {
    from {
        opacity: 0;
        filter: blur(6px);
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        filter: blur(0);
        transform: translateY(0);
    }
}

.fade-in-element {
    opacity: 0;
    filter: blur(6px);
    transform: translateY(20px);
}

.fade-in-element.animate {
    animation: fadeInUp 0.6s ease-out forwards;
}

.site-header {
    animation-delay: 0.1s;
}

.column:nth-child(1) {
    animation-delay: 0.2s;
}

.column:nth-child(2) {
    animation-delay: 0.3s;
}

.column:nth-child(3) {
    animation-delay: 0.4s;
}

.site-footer {
    animation-delay: 0.5s;
}

.video-player-circle {
    animation-delay: 1s;
}

/* Work page stagger */
.work-content > h1 {
    animation-delay: 0.1s;
}

.work-entry:nth-child(2) {
    animation-delay: 0.2s;
}

.work-entry:nth-child(3) {
    animation-delay: 0.3s;
}

.work-entry:nth-child(4) {
    animation-delay: 0.4s;
}

/* Bookshelf page stagger */
.bookshelf-content > h1 {
    animation-delay: 0.1s;
}

.book-entry:nth-child(1) {
    animation-delay: 0.2s;
}

.book-entry:nth-child(2) {
    animation-delay: 0.3s;
}

.book-entry:nth-child(3) {
    animation-delay: 0.4s;
}

/* ================================
   Circular Video Player
   ================================ */

@keyframes fadeInVideo {
    from {
        opacity: 0;
        filter: blur(6px);
    }
    to {
        opacity: 1;
        filter: blur(0);
    }
}

.video-player-circle {
    position: fixed;
    top: 40px;
    left: 50%;
    transform: translateX(-50%);
    width: 120px;
    height: 120px;
    border-radius: 50%;
    overflow: hidden;
    cursor: pointer;
    z-index: 1000;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
    transition: width 0.4s ease, height 0.4s ease, top 0.4s ease, left 0.4s ease, transform 0.4s ease;
    opacity: 0;
    filter: blur(6px);
    animation: fadeInVideo 0.6s ease-out 1s forwards;
}

.video-player-circle.expanded {
    width: 200px;
    height: 200px;
    top: 60px;
}

.video-player-circle.dragging {
    cursor: grabbing;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3), 0 0 0 8px var(--color-bg), 0 0 0 10px var(--color-accent);
}

.video-player-circle.expanded:not(.dragging) {
    cursor: grab;
}

.playback-speed-button {
    position: fixed;
    font-family: var(--font-sans);
    font-size: 18px;
    color: var(--color-base);
    background: var(--color-accent);
    border: none;
    cursor: pointer;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    display: none;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    opacity: 0;
    transition: opacity 0.5s ease, transform 0.2s ease;
    z-index: 1001;
}

.playback-speed-button.visible {
    display: flex;
    opacity: 1;
}

.playback-speed-button:hover {
    opacity: 0.8;
    transform: translateX(-50%) scale(1.05);
}

.playback-speed-button.hidden {
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.1s ease, transform 0.2s ease;
}

@media (max-width: 768px) {
    .playback-speed-button {
        font-size: 14px;
    }
}

.video-player-circle video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    pointer-events: auto;
}

.video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.video-overlay.hidden {
    opacity: 0;
    pointer-events: none;
    visibility: hidden;
}

.play-button-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    pointer-events: auto;
    cursor: pointer;
    transform: translateY(6px);
}

.play-icon {
    width: 60px;
    height: 60px;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.4));
    transition: transform 0.2s ease;
    transform: scale(0.75) translateX(2px);
}

.play-button-wrapper:hover .play-icon {
    transform: scale(0.825) translateX(2px);
}

.play-icon svg {
    width: 100%;
    height: 100%;
}

.play-icon svg path {
    stroke-linejoin: round;
    stroke-linecap: round;
}

.video-duration {
    font-family: var(--font-mono);
    font-size: 14px;
    color: white;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.4));
    transform: translateY(-8px);
}

@media (max-width: 768px) {
    .video-player-circle {
        width: 90px;
        height: 90px;
        top: 20px;
    }

    .video-player-circle.expanded {
        width: 188px;
        height: 188px;
        top: 40px;
    }

    .play-icon {
        width: 40px;
        height: 40px;
    }

    .video-duration {
        font-size: 12px;
    }
}

/* ================================
   Print Styles
   ================================ */

@media print {
    body {
        background-color: white;
        color: black;
    }

    a {
        color: black;
        text-decoration: underline;
    }

    .site-nav {
        display: none;
    }
}