/* ========================================
   JKCA-WEB - Main Stylesheet
   Technical, clean, modern design
   ======================================== */

/* CSS Variables - Theme Tokens */
:root {
  /* Colors - Dark theme (default) */
  --color-bg: #0a0a0b;
  --color-bg-secondary: #111113;
  --color-bg-tertiary: #18181b;
  --color-text: #fafafa;
  --color-text-secondary: #a1a1aa;
  --color-text-muted: #71717a;
  --color-border: #27272a;
  --color-border-hover: #3f3f46;
  --color-accent: #3b82f6;
  --color-accent-secondary: #60a5fa;
  --color-accent-muted: #1d4ed8;
  --color-success: #22c55e;
  --color-warning: #f59e0b;
  --color-error: #ef4444;

  /* Typography */
  --font-sans:
    ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono:
    ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono",
    monospace;

  /* Sizing */
  --max-width: 1600px;
  --content-width: 720px;
  --header-height: 64px;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* Borders */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
}

/* Light theme */
[data-theme="light"] {
  --color-bg: #ffffff;
  --color-bg-secondary: #f4f4f5;
  --color-bg-tertiary: #e4e4e7;
  --color-text: #18181b;
  --color-text-secondary: #52525b;
  --color-text-muted: #71717a;
  --color-border: #d4d4d8;
  --color-border-hover: #a1a1aa;
  --color-accent: #2563eb;
  --color-accent-secondary: #3b82f6;
  --color-accent-muted: #1e40af;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

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

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   Skip Link (Accessibility)
   ======================================== */
.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-accent);
  color: white;
  text-decoration: none;
  z-index: 1000;
}

.skip-link:focus {
  top: 0;
}

/* ========================================
   Header & Navigation
   ======================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(8px);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  height: var(--header-height);
}

.nav-logo {
  text-decoration: none;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text);
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  transition: color var(--transition-fast);
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--color-text);
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  border-color: var(--color-border-hover);
  color: var(--color-text);
}

.icon-sun {
  display: none;
}

.icon-moon {
  display: block;
}

[data-theme="light"] .icon-sun {
  display: block;
}

[data-theme="light"] .icon-moon {
  display: none;
}

/* ========================================
   Main Content
   ======================================== */
.main-content {
  min-height: calc(100vh - var(--header-height) - 120px);
}

.section {
  padding: var(--spacing-3xl) 0;
}

.section-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.section-title {
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xl);
  color: var(--color-text);
}

.section-footer {
  margin-top: var(--spacing-xl);
  text-align: center;
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  min-height: calc(100vh - var(--header-height));
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-3xl) var(--spacing-lg);
}

.hero-content {
  max-width: var(--content-width);
  text-align: center;
}

.hero-diagram {
  margin-bottom: var(--spacing-xl);
}

.system-diagram {
  width: 100%;
  max-width: 400px;
  height: auto;
  color: var(--color-text-muted);
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
  max-width: 540px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* ========================================
   Buttons
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  border: 1px solid transparent;
  cursor: pointer;
}

.btn-primary {
  background: var(--color-accent);
  color: white;
}

.btn-primary:hover {
  background: var(--color-accent-muted);
}

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

.btn-secondary:hover {
  border-color: var(--color-text-secondary);
  background: var(--color-bg-secondary);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
}

.btn-ghost:hover {
  color: var(--color-text);
  background: var(--color-bg-secondary);
}

/* ========================================
   Home Page Specifics
   ======================================== */
.hero-thesis {
  margin-bottom: var(--spacing-xl);
  font-size: 1.25rem;
  line-height: 1.4;
  color: var(--color-text);
}

.hero-thesis p {
  margin-bottom: var(--spacing-xs);
}

.hero-intro {
  margin-bottom: var(--spacing-2xl);
  color: var(--color-text-secondary);
  font-size: 1rem;
}

.hero-intro p {
  margin-bottom: var(--spacing-xs);
}

.focus-list {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
}

.focus-list li {
  padding: var(--spacing-md);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
}

.chips-container {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.chip {
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

/* ========================================
   Project Cards
   ======================================== */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-lg);
}

.project-card {
  display: block;
  padding: var(--spacing-lg);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: all var(--transition-base);
  position: relative;
}

.project-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.project-card:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
}

.card-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text);
}

.card-status {
  font-size: 0.75rem;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.status-stable {
  background: rgba(34, 197, 94, 0.1);
  color: var(--color-success);
}

.status-wip {
  background: rgba(245, 158, 11, 0.1);
  color: var(--color-warning);
}

.status-archived {
  background: rgba(113, 113, 122, 0.1);
  color: var(--color-text-muted);
}

.status-paused {
  background: rgba(113, 113, 122, 0.1);
  color: var(--color-text-muted);
}

.card-meta {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
  margin-bottom: var(--spacing-sm);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.card-timeframe {
  color: var(--color-text-muted);
}

.card-role {
  color: var(--color-text-secondary);
}

.card-role::before {
  content: "\2022";
  margin-right: var(--spacing-xs);
  color: var(--color-text-muted);
}

.card-summary {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  margin-bottom: var(--spacing-md);
}

.card-tags {
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
}

.tag {
  font-size: 0.75rem;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--color-bg-tertiary);
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
}

.card-arrow {
  position: absolute;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  color: var(--color-text-muted);
  font-size: 1.25rem;
  transition: transform var(--transition-fast);
}

.project-card:hover .card-arrow {
  transform: translateX(4px);
  color: var(--color-accent);
}

/* Project List (Work page) */
.project-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.project-card-large {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-xl);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: all var(--transition-base);
}

.project-card-large:hover {
  border-color: var(--color-accent);
  transform: translateX(4px);
}

.project-card-large .card-content {
  flex: 1;
}

.project-card-large .card-arrow {
  position: static;
  font-size: 1.5rem;
  margin-left: var(--spacing-lg);
}

/* ========================================
   GitHub Section
   ======================================== */
.github-section {
  background: var(--color-bg-secondary);
}

.repo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-md);
}

.repo-card {
  display: block;
  padding: var(--spacing-md);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.repo-card:hover {
  border-color: var(--color-accent);
}

.repo-name {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--spacing-xs);
}

.repo-description {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.repo-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.repo-language {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.lang-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-text-muted);
}

.lang-typescript {
  background: #3178c6;
}
.lang-python {
  background: #3572a5;
}
.lang-rust {
  background: #dea584;
}
.lang-swift {
  background: #f05138;
}
.lang-c\+\+ {
  background: #f34b7d;
}

.repo-stars {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

/* ========================================
   Page Headers
   ======================================== */
.page-header {
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
  border-bottom: 1px solid var(--color-border);
}

.page-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.page-description {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  max-width: var(--content-width);
}

/* ========================================
   Project Detail
   ======================================== */
.project-detail {
  padding-bottom: var(--spacing-3xl);
}

.project-header {
  padding: var(--spacing-3xl) 0;
  border-bottom: 1px solid var(--color-border);
}

.back-link {
  display: inline-block;
  color: var(--color-text-secondary);
  text-decoration: none;
  margin-bottom: var(--spacing-lg);
  font-size: 0.875rem;
}

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

.project-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

.project-summary {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
}

.project-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  margin-bottom: var(--spacing-lg);
}

.project-status {
  font-size: 0.875rem;
  padding: var(--spacing-xs) var(--spacing-md);
}

.project-timeframe {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.project-role {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.project-links {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.project-content {
  padding: var(--spacing-3xl) 0;
}

/* Prose (markdown content) */
.prose {
  max-width: var(--content-width);
}

.prose h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-top: var(--spacing-2xl);
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

.prose h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.prose p {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
}

.prose ul,
.prose ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-xl);
  color: var(--color-text-secondary);
}

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

.prose strong {
  color: var(--color-text);
  font-weight: 600;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--color-bg-tertiary);
  padding: 0.125em 0.375em;
  border-radius: var(--radius-sm);
}

.prose pre {
  background: var(--color-bg-tertiary);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin-bottom: var(--spacing-md);
}

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

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

.prose a:hover {
  color: var(--color-accent-secondary);
}

/* ========================================
   Tools Page
   ======================================== */
.tool-category {
  margin-bottom: var(--spacing-2xl);
}

.category-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--color-border);
}

.tool-list {
  list-style: none;
}

.tool-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--color-border);
}

.tool-item:last-child {
  border-bottom: none;
}

.tool-name {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--spacing-xs);
}

.tool-summary {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

/* ========================================
   About Page
   ======================================== */
.about-content .section-container {
  max-width: var(--content-width);
}

.about-section {
  margin-bottom: var(--spacing-2xl);
}

.about-section h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

.about-section p {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.about-section a {
  color: var(--color-accent);
  text-decoration: underline;
}

.constraint-list,
.work-list,
.link-list {
  list-style: none;
}

.constraint-list li,
.work-list li {
  padding: var(--spacing-sm) 0;
  color: var(--color-text-secondary);
}

.link-list li {
  margin-bottom: var(--spacing-sm);
}

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

.link-list a:hover {
  text-decoration: underline;
}

/* ========================================
   Contact Page
   ======================================== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

.contact-method h2 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.contact-link {
  font-size: 1.125rem;
  color: var(--color-accent);
  text-decoration: none;
}

.contact-link:hover {
  text-decoration: underline;
}

.contact-note {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-top: var(--spacing-sm);
}

.contact-pgp {
  padding: var(--spacing-xl);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
}

.contact-pgp h2 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.contact-pgp p {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
}

/* ========================================
   Writing Page
   ======================================== */
.empty-state {
  text-align: center;
  padding: var(--spacing-3xl);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
}

.empty-state h2 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-md);
}

.empty-state p {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.empty-state a {
  color: var(--color-accent);
}

/* ========================================
   Error Page
   ======================================== */
.error-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - var(--header-height) - 120px);
  text-align: center;
}

.error-code {
  font-size: 8rem;
  font-weight: 700;
  color: var(--color-text-muted);
  line-height: 1;
  margin-bottom: var(--spacing-md);
}

.error-message {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
}

/* ========================================
   Footer
   ======================================== */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-xl) 0;
}

.footer-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.footer-copy {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.footer-nav {
  display: flex;
  gap: var(--spacing-lg);
}

.footer-nav a {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  text-decoration: none;
}

.footer-nav a:hover {
  color: var(--color-text);
}

/* ========================================
   Links
   ======================================== */
.link-arrow {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 500;
}

.link-arrow:hover {
  text-decoration: underline;
}

/* ========================================
   Animations
   ======================================== */

/* Hero diagram animation */
.diagram-edge {
  stroke-dasharray: 100;
  stroke-dashoffset: 100;
  animation: draw-edge 1.5s ease forwards;
}

.diagram-node {
  opacity: 0;
  animation: fade-in-node 0.4s ease forwards;
}

.node-1 {
  animation-delay: 0.3s;
}
.node-2 {
  animation-delay: 0.5s;
}
.node-3 {
  animation-delay: 0.6s;
}
.node-4 {
  animation-delay: 0.8s;
}
.node-5 {
  animation-delay: 1s;
}
.node-6 {
  animation-delay: 1.1s;
}
.node-7 {
  animation-delay: 1.3s;
}

@keyframes draw-edge {
  to {
    stroke-dashoffset: 0;
  }
}

@keyframes fade-in-node {
  to {
    opacity: 1;
  }
}

/* Scroll reveal */
.reveal-on-scroll {
  opacity: 0;
  transform: translateY(20px) scale(0.985);
  filter: blur(4px);
  transition:
    opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.8s cubic-bezier(0.16, 1, 0.3, 1),
    filter 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform, filter;
}

.reveal-on-scroll.revealed {
  opacity: 1;
  transform: translateY(0) scale(1);
  filter: blur(0);
}

/* Stagger utility - can be applied via style="--stagger: N" */
.reveal-on-scroll[style*="--stagger"] {
  transition-delay: calc(var(--stagger) * 100ms);
}

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

  .diagram-edge {
    stroke-dashoffset: 0;
  }

  .diagram-node {
    opacity: 1;
  }

  .reveal-on-scroll {
    opacity: 1;
    transform: none;
  }

  .project-card:hover,
  .project-card-large:hover {
    transform: none;
  }

  .card-arrow {
    transform: none;
  }

  .project-card:hover .card-arrow {
    transform: none;
  }
}

/* ========================================
   Meeting Scheduler (meet.jkca.me)
   ======================================== */
.meet-hero {
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
  text-align: center;
}

.meet-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.meet-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  max-width: 480px;
  margin: 0 auto;
}

.meet-form-section {
  padding-top: 0;
}

.meet-form {
  max-width: 540px;
  margin: 0 auto;
  padding: var(--spacing-xl);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group label {
  display: block;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
}

.form-group .optional {
  font-weight: 400;
  color: var(--color-text-muted);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 1rem;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-muted);
}

.form-group textarea {
  resize: vertical;
  min-height: 80px;
}

.form-help {
  display: block;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-top: var(--spacing-xs);
}

.form-row {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--spacing-md);
}

.btn-submit {
  width: 100%;
  padding: var(--spacing-md);
  font-size: 1rem;
}

.meet-info {
  max-width: 540px;
  margin: var(--spacing-xl) auto 0;
  padding: var(--spacing-lg);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.meet-info h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
}

.meet-info ul {
  list-style: none;
  padding: 0;
}

.meet-info li {
  position: relative;
  padding-left: var(--spacing-lg);
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  margin-bottom: var(--spacing-sm);
}

.meet-info li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
}

/* Success page */
.meet-success .success-icon {
  color: var(--color-success);
  margin-bottom: var(--spacing-lg);
}

.success-details {
  max-width: 480px;
  margin: 0 auto;
  text-align: center;
}

.success-details h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-lg);
  color: var(--color-text);
}

.details-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-xl);
}

.detail-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.detail-item dt {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

.detail-item dd {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
}

.next-steps {
  text-align: left;
  margin-bottom: var(--spacing-xl);
}

.next-steps h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

.next-steps ol {
  padding-left: var(--spacing-lg);
  color: var(--color-text-secondary);
}

.next-steps li {
  margin-bottom: var(--spacing-sm);
}

.success-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
}

/* Error page */
.meet-error .error-icon {
  color: var(--color-error);
  margin-bottom: var(--spacing-lg);
}

.error-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  max-width: 480px;
  margin: 0 auto;
}

/* ========================================
   URL Shortener (link.jkca.me)
   ======================================== */
.shortener-page {
  min-height: calc(100vh - var(--header-height) - 120px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-2xl) var(--spacing-lg);
}

.shortener-container {
  width: 100%;
  max-width: 540px;
}

.shortener-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.shortener-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.shortener-subtitle {
  font-size: 1rem;
  color: var(--color-text-secondary);
}

.shortener-form {
  margin-bottom: var(--spacing-lg);
}

.input-group {
  display: flex;
  gap: var(--spacing-sm);
}

.shortener-input {
  flex: 1;
  padding: var(--spacing-md);
  font-size: 1rem;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.shortener-input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.shortener-input::placeholder {
  color: var(--color-text-muted);
}

.shortener-btn {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1rem;
  font-weight: 500;
  color: white;
  background: var(--color-accent);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast);
  white-space: nowrap;
}

.shortener-btn:hover:not(:disabled) {
  background: var(--color-accent-muted);
}

.shortener-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-loading {
  letter-spacing: 0.1em;
}

/* Result area */
.result-area {
  padding: var(--spacing-lg);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.result-label {
  display: block;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.result-link-group {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.result-input {
  flex: 1;
  padding: var(--spacing-md);
  font-size: 1rem;
  font-family: var(--font-mono);
  color: var(--color-accent);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.result-input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.copy-btn {
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  min-width: 90px;
}

.copy-btn:hover {
  border-color: var(--color-border-hover);
  background: var(--color-border);
}

.copy-success {
  color: var(--color-success);
}

.result-expiry {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* Error area */
.error-area {
  padding: var(--spacing-md);
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid var(--color-error);
  border-radius: var(--radius-md);
}

.error-message {
  font-size: 0.9375rem;
  color: var(--color-error);
  margin: 0;
}

/* Expired page */
.error-note {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-xl);
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .hero {
    min-height: auto;
    padding: var(--spacing-2xl) var(--spacing-md);
  }

  .hero-title {
    font-size: 2rem;
  }

  .hero-cta {
    flex-direction: column;
    align-items: stretch;
  }

  .project-card-large {
    flex-direction: column;
    align-items: flex-start;
  }

  .project-card-large .card-arrow {
    margin-left: 0;
    margin-top: var(--spacing-md);
  }

  .footer-container {
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
  }

  /* Meet form responsive */
  .meet-title {
    font-size: 2rem;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .success-actions,
  .error-actions {
    flex-direction: column;
  }

  /* Shortener responsive */
  .shortener-title {
    font-size: 1.75rem;
  }

  .input-group {
    flex-direction: column;
  }

  .shortener-btn {
    width: 100%;
  }

  .result-link-group {
    flex-direction: column;
  }

  .copy-btn {
    width: 100%;
  }
}

/* ========================================
   Blog (ai.jkca.me)
   ======================================== */
.blog-body {
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.blog-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-md) var(--spacing-lg);
}

.blog-nav {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.blog-logo .logo-text {
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-text);
}

.blog-nav-links .nav-back {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  text-decoration: none;
}

.blog-nav-links .nav-back:hover {
  color: var(--color-text-secondary);
}

.blog-main {
  flex: 1;
  max-width: 720px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-lg);
  width: 100%;
}

.blog-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-lg);
  margin-top: auto;
}

.blog-footer .footer-container {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.blog-footer .footer-nav {
  display: flex;
  gap: var(--spacing-lg);
}

.blog-footer .footer-nav a {
  color: var(--color-text-muted);
  text-decoration: none;
}

.blog-footer .footer-nav a:hover {
  color: var(--color-text-secondary);
}

/* Coming Soon Page */
.coming-soon-container {
  min-height: calc(100vh - var(--header-height) - 120px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-2xl);
  text-align: center;
}

.coming-soon-content {
  max-width: 560px;
}

.coming-soon-symbol {
  font-size: 4rem;
  margin-bottom: var(--spacing-xl);
  opacity: 0.6;
  font-family: var(--font-mono);
  letter-spacing: 0.5em;
  color: var(--color-text-muted);
  animation: pulse-slow 4s ease-in-out infinite;
}

@keyframes pulse-slow {
  0%,
  100% {
    opacity: 0.4;
  }
  50% {
    opacity: 0.7;
  }
}

@media (prefers-reduced-motion: reduce) {
  .coming-soon-symbol {
    animation: none;
    opacity: 0.6;
  }
}

.coming-soon-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 600;
  margin-bottom: var(--spacing-lg);
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.coming-soon-description {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--spacing-2xl);
}

.coming-soon-meta {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
}

.coming-soon-divider {
  width: 48px;
  height: 1px;
  background: var(--color-border);
  margin: var(--spacing-xl) auto;
}

.coming-soon-topics {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-xl);
}

/* ========================================
   Hologram Hero (Scroll-Driven)
   ======================================== */
.hero-scroll-container {
  height: 300vh; /* Controlled by JS or scroll range */
  position: relative;
  background: var(--color-bg);
}

.hero-sticky {
  position: sticky;
  top: 0;
  height: 100vh;
  height: 100svh;
  width: 100%;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

#hero-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

.hero-overlay {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: var(--container-width);
  padding: 0 var(--spacing-lg);
  display: flex;
  flex-direction: column;
  pointer-events: none;
}

.hero-text-block {
  max-width: 500px;
  pointer-events: auto;
}

.hero-subtitle {
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  font-weight: 500;
  color: var(--color-text-secondary);
  line-height: 1.2;
  margin-bottom: var(--spacing-xl);
  letter-spacing: -0.02em;
}

.hero-caption {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.badge {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(0, 255, 255, 0.1);
  border: 1px solid var(--color-accent);
  color: var(--color-accent);
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--spacing-md);
}

/* Schematic Labels */
.schematic-labels {
  position: absolute;
  right: var(--spacing-2xl);
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  pointer-events: none;
  z-index: 2;
}

.label-node {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  padding-left: var(--spacing-md);
  border-left: 1px solid var(--color-border);
  opacity: 0;
  transform: translateX(10px);
  transition: all 0.5s var(--ease-out-expo);
}

.label-node.active {
  opacity: 1;
  transform: translateX(0);
  color: var(--color-accent);
  border-left-color: var(--color-accent);
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  .hero-scroll-container {
    height: auto;
  }
  .hero-sticky {
    position: relative;
    height: auto;
    padding: var(--spacing-3xl) 0;
  }
  #hero-canvas {
    display: none;
  }
  .reduced-motion-fallback {
    display: block !important;
    text-align: center;
    padding: var(--spacing-2xl);
    border: 1px dashed var(--color-border);
    margin-bottom: var(--spacing-2xl);
  }
}

.reduced-motion-fallback {
  display: none;
}

@media (max-width: 768px) {
  .hero-overlay {
    text-align: center;
    align-items: center;
  }
  .schematic-labels {
    display: none;
  }
}

/* ========================================
   Animation Pages (research.jkca.me Unified Design)
   ======================================== */

/* Shared header for all animation pages */
.research-header {
  padding: var(--spacing-lg) var(--spacing-xl);
  border-bottom: 1px solid #e5e5e5;
  background: #ffffff;
  font-size: 0.9375rem;
  color: #525252;
  position: sticky;
  top: 0;
  z-index: 100;
  /* Safe zone for mobile viewports */
  padding-left: max(var(--spacing-xl), env(safe-area-inset-left));
  padding-right: max(var(--spacing-xl), env(safe-area-inset-right));
}

.research-header .header-home {
  color: #171717;
  text-decoration: none;
  font-weight: 600; /* Increased weight for hierarchy */
  transition: color var(--transition-base);
}

.research-header .header-home:hover {
  text-decoration: underline;
  color: #000000;
}

.research-header .header-separator {
  margin: 0 0.5rem;
  color: #a3a3a3;
  user-select: none;
}

.research-header .header-current {
  color: #525252;
}

/* Shared footer for all animation pages */
.research-footer {
  text-align: center;
  padding: var(--spacing-2xl) var(--spacing-lg);
  border-top: 1px solid #e5e5e5;
  background: #ffffff;
  color: #737373;
  font-size: 0.8125rem; /* Tighter footer text */
}

/* TIGHT TYPOGRAPHY TOKENS */
/* Enforcing 1.3 line-height for headings/emphasis */
.animation-page-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: #171717;
  margin-bottom: var(--spacing-md) !important;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.animation-page-subhead {
  font-size: 1.125rem;
  color: #525252;
  line-height: 1.5; /* Tightened from 1.8 */
  margin-bottom: var(--spacing-2xl);
  max-width: 65ch; /* Readable line length */
}

/* Then-Now Page Refinement */
.then-now-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-3xl) var(--spacing-lg);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  min-height: 300vh;
  background: #ffffff;
}

.then-now-main .text-section {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  gap: 40vh;
  padding: var(--spacing-xl) 0;
}

.animation-section {
  position: sticky;
  top: var(--spacing-3xl); /* More breathing room */
  height: calc(100vh - var(--spacing-3xl) * 2);
  display: flex;
  align-items: flex-start;
  justify-content: center;
}

#then-now-canvas {
  display: block;
  width: 100%;
  max-width: 600px; /* Constrained for balance */
  height: auto;
  aspect-ratio: 2/3;
  background: #0a0a0f;
  border-radius: 8px;
  border: 1px solid #e5e5e5;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.text-block {
  padding: var(--spacing-xl);
  background: #ffffff; /* Cleaner look */
  border-left: 4px solid #e5e5e5; /* Distinct from cards */
  border-radius: 0 4px 4px 0;
  transition: all var(--transition-base);
}

.text-block:hover {
  border-left-color: #171717;
}

.text-block .emphasis {
  font-size: 1.25rem; /* Hierarchy fix */
  font-weight: 600;
  line-height: 1.4;
  color: #171717;
  margin: 0;
}

.copy-section {
  padding: var(--spacing-xl);
  background: #fafafa;
  border: 1px solid #e5e5e5;
  border-radius: 8px;
}

.copy-section h2 {
  font-size: 1.25rem; /* Aligned with emphasis */
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: #171717;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.875rem;
}

.copy-section ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.copy-section li {
  padding: var(--spacing-xs) 0;
  color: #525252;
  font-size: 0.9375rem;
  line-height: 1.5;
  display: flex; /* Better alignment */
  gap: 0.5rem;
}

.copy-section li::before {
  content: "•";
  color: #a3a3a3;
}

.copy-section li strong {
  color: #171717;
  font-weight: 600;
}

/* Responsive Design Fixes */
@media (max-width: 1024px) {
  .then-now-main {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    padding-top: var(--spacing-xl);
  }

  .animation-section {
    position: relative;
    top: 0;
    height: 50vh; /* Visible context */
    margin-bottom: var(--spacing-xl);
  }
  
  #then-now-canvas {
    max-width: 100%;
    max-height: 50vh;
  }

  .then-now-main .text-section {
    gap: var(--spacing-2xl);
  }
}

@media (max-width: 768px) {
  .animation-page-title {
    font-size: 2rem;
  }

  .text-block .emphasis {
    font-size: 1.125rem;
  }
  
  .research-header {
    padding: var(--spacing-md);
    font-size: 0.875rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .then-now-main {
    min-height: auto;
  }
  #then-now-canvas {
    opacity: 1; /* Keep visible */
  }
}

/* Prompt Physics Page Refinement */
.prompt-physics-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-3xl) var(--spacing-lg);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  min-height: 300vh;
  background: #ffffff;
}

.prompt-physics-main .text-section {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  gap: var(--spacing-3xl);
  padding: var(--spacing-xl) 0;
}

.conflict-detector {
  position: sticky;
  top: var(--spacing-3xl);
  padding: var(--spacing-xl);
  background: #fafafa;
  border: 1px solid #e5e5e5;
  border-radius: 8px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05); /* Added depth */
}

.conflict-detector h3 {
  font-size: 1rem;
  font-weight: 600;
  color: #171717;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-sm);
}

.detector-instructions {
  font-size: 0.8125rem;
  color: #737373;
  margin-bottom: var(--spacing-lg);
}

.prompt-examples {
  margin-bottom: var(--spacing-xl);
}

.example-prompt {
  padding: var(--spacing-lg);
  background: #ffffff;
  border: 1px solid #e5e5e5;
  border-radius: 6px;
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.02);
}

.prompt-text {
  font-size: 1rem;
  line-height: 1.6;
  color: #171717;
}

.prompt-text .token {
  padding: 0 4px;
  border-radius: 2px;
  transition: all 0.2s ease;
  position: relative;
}

.prompt-text .token.active {
  background: #fee2e2; /* Softer red background */
  color: #b91c1c; /* Higher contrast red text */
  font-weight: 500;
}

#uncertainty-cone {
  display: block;
  width: 100%;
  max-width: 600px;
  height: auto;
  margin: 0 auto;
}

/* Responsive for prompt-physics */
@media (max-width: 1024px) {
  .prompt-physics-main {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    padding-top: var(--spacing-xl);
  }

  .conflict-detector {
    position: relative;
    top: 0;
    margin-bottom: var(--spacing-xl);
  }
}

@media (max-width: 768px) {
  .prompt-text {
    font-size: 0.9375rem;
  }
}

/* Determinism Page Refinement */
.determinism-main {
  background: #ffffff;
}

.split-narrative {
  display: grid;
  grid-template-columns: 1fr 1fr;
  max-width: 1400px;
  margin: 0 auto;
  min-height: 400vh;
}

.narrative-content {
  padding: var(--spacing-3xl) var(--spacing-xl);
}

.narrative-beat {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  padding-top: var(--spacing-3xl);
}

/* Align first beat with other pages (Target: 6rem total offset) */
.narrative-beat:first-child {
  padding-top: var(--spacing-xl);
}

.visual-section {
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
  background: #ffffff; /* Overlap fix */
}

#determinism-visual {
  width: 100%;
  height: auto;
  aspect-ratio: 1/1;
  max-width: 600px;
  background: #fafafa;
  border: 1px solid #e5e5e5;
  border-radius: 8px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

/* Responsive for determinism */
@media (max-width: 1024px) {
  .split-narrative {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .narrative-beat {
    min-height: auto;
    padding-bottom: var(--spacing-3xl);
  }

  .visual-section {
    position: sticky; /* Keep sticky on mobile, but smaller */
    top: 0;
    height: 50vh;
    padding: var(--spacing-md);
    z-index: 10;
    border-bottom: 1px solid #e5e5e5;
  }

  #determinism-visual {
    max-height: 100%;
  }
}


/* ========================================
   Diagrams (Receipt, MoE, Architecture)
   ======================================== */
.diagram-container {
  margin: var(--spacing-2xl) 0;
  padding: var(--spacing-lg);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}

.diagram-container svg {
  max-width: 100%;
  height: auto;
  display: block;
}

.receipt-diagram,
.moe-diagram,
.architecture-diagram {
  width: 100%;
  max-width: 600px;
}

.diagram-caption {
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-border);
  width: 100%;
  max-width: 600px;
}

.diagram-caption p {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  line-height: 1.5;
  margin: 0;
}

.diagram-caption strong {
  color: var(--color-text);
  font-weight: 600;
}

/* Reduced motion: disable any diagram animations */
@media (prefers-reduced-motion: reduce) {
  .diagram-container svg {
    animation: none !important;
  }
  
  .diagram-container svg * {
    animation: none !important;
    transition: none !important;
  }
}

/* Mobile optimization */
@media (max-width: 768px) {
  .diagram-container {
    padding: var(--spacing-md);
    margin: var(--spacing-xl) 0;
  }
  
  .diagram-container svg {
    font-size: 0.75rem;
  }
}


/* ========================================
   Timeline (About page)
   ======================================== */
.timeline {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  position: relative;
  padding-left: var(--spacing-xl);
  border-left: 1px solid var(--color-border);
  margin-top: var(--spacing-lg);
}

.timeline-item {
  position: relative;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--spacing-xl) - 5px); /* Adjust for border width + dot center */
  top: 0.35em;
  width: 9px;
  height: 9px;
  background: var(--color-bg);
  border: 2px solid var(--color-text-muted);
  border-radius: 50%;
  transition: border-color var(--transition-fast);
}

.timeline-item:hover::before {
  border-color: var(--color-accent);
}

.timeline-role {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--spacing-xs);
}

.timeline-company {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

/* ========================================
   Topography & Layout Normalization
   ======================================== */

/* Page Header Strategy
   Logic: Every standard page (non-home) starts with a clear H1 and subtitle.
   Idea: Distinct from content, sets context immediately.
*/
.page-header {
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
  background: var(--color-bg);
  /* Optional: border-bottom: 1px solid var(--color-border); if you want separation */
}

.page-title {
  font-size: 2.5rem; /* 40px */
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
  letter-spacing: -0.02em;
}

.page-description {
  font-size: 1.25rem; /* 20px */
  line-height: 1.6;
  color: var(--color-text-secondary);
  max-width: 65ch; /* Optimal reading length */
}

/* Prose Strategy
   Logic: Long-form text uses specific readability constraints.
*/
.prose {
  max-width: 65ch;
  line-height: 1.75;
}

.prose p {
  margin-bottom: var(--spacing-lg);
}

.prose h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-top: var(--spacing-2xl);
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

.prose h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

/* ========================================
   Blog / Writing List Topology
   ======================================== */
.post-list {
  display: flex;
  flex-direction: column;
}

.post-item,
.post-preview {
  display: block;
  padding: var(--spacing-xl) 0;
  border-bottom: 1px solid var(--color-border);
  text-decoration: none;
  transition: opacity var(--transition-fast);
}

.post-item:first-child {
  border-top: 1px solid var(--color-border);
}

.post-item:hover {
  opacity: 0.8;
}

.post-date {
  font-size: 0.8125rem; /* 13px */
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  margin-bottom: var(--spacing-xs);
  display: block;
}

.post-title {
  display: block;
  font-size: 1.25rem; /* 20px */
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
  line-height: 1.4;
}

.post-item:hover .post-title,
.post-preview:hover .post-title a {
  color: var(--color-accent);
}

.post-excerpt,
.post-summary {
  display: block;
  font-size: 0.9375rem; /* 15px */
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--spacing-md);
  max-width: 65ch;
}

.post-tags {
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
}

/* Reusing .tag from project cards, strictly ensuring it works here */
.post-tag {
  font-size: 0.6875rem;
  padding: 2px var(--spacing-sm);
  background: var(--color-bg-tertiary);
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
}

/* ========================================
   Single Post Topology
   ======================================== */
.blog-post {
  max-width: 720px;
  margin: 0 auto;
  padding: var(--spacing-3xl) var(--spacing-lg);
}

.post-header {
  margin-bottom: var(--spacing-2xl);
  padding-bottom: var(--spacing-xl);
  border-bottom: 1px solid var(--color-border);
}

.post-back {
  display: inline-block;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  margin-bottom: var(--spacing-lg);
  transition: color var(--transition-fast);
}

.post-back:hover {
  color: var(--color-text);
}

.post-back::before {
  content: "←";
  margin-right: var(--spacing-xs);
}

.post-meta {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.post-excerpt-header {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--spacing-lg);
}

.post-content {
  line-height: 1.8;
  font-size: 1.0625rem;
}

.post-content p {
  margin-bottom: var(--spacing-lg);
  color: var(--color-text-secondary);
}

.post-content h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-top: var(--spacing-2xl);
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

.post-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.post-content ul, 
.post-content ol {
  margin-bottom: var(--spacing-lg);
  padding-left: var(--spacing-xl);
  color: var(--color-text-secondary);
}

.post-content li {
  margin-bottom: var(--spacing-sm);
}

.post-content blockquote {
  border-left: 3px solid var(--color-border);
  padding-left: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
  color: var(--color-text-muted);
  font-style: italic;
}

.post-content code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--color-bg-tertiary);
  padding: 0.125em 0.375em;
  border-radius: var(--radius-sm);
}

.post-content pre {
  background: var(--color-bg-tertiary);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: var(--spacing-lg) 0;
}

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

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

.post-content a:hover {
  color: var(--color-accent-secondary);
}

.post-footer {
  margin-top: var(--spacing-3xl);
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--color-border);
}

.post-footer-nav {
  display: flex;
  justify-content: space-between;
}

.post-footer-link {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.post-footer-link:hover {
  color: var(--color-text);
}