/* ========================================
   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: 1200px;
  --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);
}

/* ========================================
   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: 1.0s; }
.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);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* 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);
}

.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);
}

.topic-tag {
  font-size: 0.75rem;
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-family: var(--font-mono);
}