/**
 * layout.css - Page Structure
 *
 * Single-column centered layout.
 * Max-width container for readability.
 * Full-bleed sections for visual breaks.
 * Mobile-first responsive design.
 *
 * Breakpoints: 320px (mobile), 768px (tablet), 1024px (desktop)
 */

/* ==========================================================================
   CONTAINER
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

.container-narrow {
  max-width: var(--container-narrow);
}

@media (min-width: 768px) {
  .container {
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }
}

/* ==========================================================================
   HEADER
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-bg-surface);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--space-12);
}

.logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.logo-text {
  font-family: var(--font-headline);
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
  color: var(--color-primary);
  letter-spacing: 0.05em;
}

.logo:hover .logo-text,
.logo:focus .logo-text {
  text-shadow: var(--text-glow-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.nav-link {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link:focus {
  color: var(--color-primary);
  text-decoration: none;
}

.nav-link[aria-current="page"] {
  color: var(--color-primary);
}

/* ---------- Mobile menu toggle ---------- */

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: var(--space-2);
  background: none;
  border: none;
  cursor: pointer;
  z-index: 101;
}

.nav-toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-fast);
}

/* Hamburger → X animation */
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: var(--space-12);
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding-top: var(--space-8);
    gap: var(--space-6);
    background-color: var(--color-bg);
    transform: translateX(100%);
    transition: transform var(--transition-slow);
    z-index: 99;
  }

  .nav-links--open {
    transform: translateX(0);
  }

  .nav-link {
    font-size: var(--text-lg);
  }

  .nav-backdrop {
    position: fixed;
    top: var(--space-12);
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.6);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-slow);
    z-index: 98;
  }

  .nav-backdrop--visible {
    opacity: 1;
    pointer-events: auto;
  }

  body.menu-open {
    overflow: hidden;
  }
}

/* ==========================================================================
   SECTIONS
   ========================================================================== */

.section {
  padding-top: var(--space-12);
  padding-bottom: var(--space-12);
}

.section-full-bleed {
  padding-top: var(--space-16);
  padding-bottom: var(--space-16);
}

.section-alt {
  background-color: var(--color-bg-elevated);
}

@media (min-width: 768px) {
  .section {
    padding-top: var(--space-12);
    padding-bottom: var(--space-12);
  }

  .section-full-bleed {
    padding-top: var(--space-16);
    padding-bottom: var(--space-16);
  }
}

/* ==========================================================================
   HERO
   ========================================================================== */

.hero {
  text-align: center;
  min-height: 40vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero.section-full-bleed {
  padding-bottom: var(--space-10);
}

.hero-quote {
  margin-bottom: var(--space-4);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.hero-quote [lang="ja"] {
  font-size: var(--text-lg);
  margin-right: var(--space-2);
}

.quote-translation {
  font-style: italic;
}

.hero-heading {
  margin-bottom: var(--space-4);
  font-size: var(--text-3xl);
  line-height: var(--leading-tight);
}

@media (min-width: 768px) {
  .hero-heading {
    font-size: var(--text-6xl);
  }
}

.hero-tagline {
  margin-bottom: var(--space-4);
  font-size: var(--text-xl);
  color: var(--color-text-muted);
}

.hero-audience {
  margin-bottom: var(--space-8);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-style: italic;
}

.hero-cta {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  align-items: center;
}

@media (min-width: 480px) {
  .hero-cta {
    flex-direction: row;
    justify-content: center;
  }
}

/* ==========================================================================
   CONTENT BLOCKS
   ========================================================================== */

.content-block {
  margin-bottom: var(--space-6);
}

.content-block:last-child {
  margin-bottom: 0;
}

.content-block h2,
.content-block h3 {
  margin-bottom: var(--space-4);
}

.lead {
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
  color: var(--color-text);
}

/* Journey Narrative (emoji sequence) */
.journey-narrative {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  margin-top: var(--space-4);
  font-size: var(--text-2xl);
}

.journey-arrow {
  color: var(--color-text-dim);
  font-size: var(--text-lg);
}

/* Pattern Formula (N=3=kata) */
.pattern-formula {
  display: inline-block;
  margin-left: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-base);
  color: var(--color-secondary);
}

/* ==========================================================================
   DIAGRAM
   ========================================================================== */

.diagram-container {
  margin-top: var(--space-8);
}

.diagram-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  padding: var(--space-6);
  background-color: var(--color-bg-surface);
  border: 2px dashed var(--color-text-dim);
  border-radius: var(--border-radius-lg);
}

.placeholder-text {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-dim);
  margin-bottom: var(--space-2);
}

.placeholder-subtext {
  font-size: var(--text-sm);
  color: var(--color-primary);
}

/* Architecture Diagram */
.architecture-diagram {
  width: 100%;
  max-width: 600px;
  height: auto;
  margin: 0 auto;
  display: block;
  border-radius: var(--border-radius-lg);
}

/* ==========================================================================
   START SECTION
   ========================================================================== */

.start-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  margin-top: var(--space-6);
}

@media (min-width: 480px) {
  .start-actions {
    flex-direction: row;
    justify-content: center;
  }
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-5);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  text-decoration: none;
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
  cursor: pointer;
  border: 2px solid transparent;
}

/* Focus styles in components.css (consolidated with glow) */

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

.btn-primary:hover,
.btn-primary:focus {
  background-color: var(--color-primary-dim);
  border-color: var(--color-primary-dim);
  box-shadow: var(--glow-primary);
  text-decoration: none;
  color: var(--color-bg);
}

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

.btn-secondary:hover,
.btn-secondary:focus {
  border-color: var(--color-primary);
  color: var(--color-primary);
  text-decoration: none;
}

.btn-lg {
  padding: var(--space-4) var(--space-6);
  font-size: var(--text-lg);
}

/* ==========================================================================
   SECTION DIVIDER
   ========================================================================== */

.section-divider {
  height: 1px;
  border: none;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(0, 240, 255, 0.15) 30%,
    rgba(139, 92, 246, 0.15) 70%,
    transparent 100%
  );
  margin: 0;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */

.site-footer {
  padding-top: var(--space-6);
  padding-bottom: var(--space-6);
  background-color: var(--color-bg);
  border-top: none;
  text-align: center;
}

.footer-signature {
  margin-bottom: var(--space-6);
}

.signature-equation {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-2);
}

.signature-kanji {
  font-size: var(--text-xl);
  color: var(--color-secondary);
}

.signature-team {
  font-size: var(--text-2xl);
  margin-top: var(--space-2);
}

.footer-contact {
  margin-bottom: var(--space-6);
}

.contact-email {
  font-size: var(--text-base);
  color: var(--color-primary);
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-4) var(--space-6);
  margin-bottom: var(--space-6);
}

.footer-nav a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding: var(--space-2) 0;
}

.footer-nav a:hover,
.footer-nav a:focus {
  color: var(--color-primary);
}

.footer-copyright {
  color: var(--color-text-dim);
}

/* ==========================================================================
   APPROACH COMPARISON (Old Way vs NEON-SOUL Way)
   ========================================================================== */

.approach-grid {
  display: grid;
  gap: var(--space-5);
  margin-top: var(--space-6);
}

@media (min-width: 768px) {
  .approach-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.approach-card {
  padding: var(--space-5);
  border-radius: var(--border-radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.approach-card h3 {
  margin-bottom: var(--space-3);
}

.approach-card p {
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
}

.approach-old {
  background-color: var(--color-bg-surface);
  opacity: 0.7;
}

.approach-old h3 {
  color: var(--color-text-muted);
}

.approach-old p {
  color: var(--color-text-dim);
}

.approach-new {
  background-color: rgba(0, 240, 255, 0.04);
  border-color: rgba(0, 240, 255, 0.2);
}

.approach-new h3 {
  color: var(--color-primary);
}

.approach-new p {
  color: var(--color-text);
}

/* ==========================================================================
   EVOLUTION LOOP
   ========================================================================== */

.evolution-loop {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-6) var(--space-4);
  background-color: var(--color-bg-surface);
  border-radius: var(--border-radius-lg);
  border: 1px solid rgba(0, 240, 255, 0.1);
}

.loop-step {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  width: 100%;
  max-width: 420px;
  background-color: var(--color-bg-elevated);
  border-radius: var(--border-radius);
  border: 1px solid rgba(255, 255, 255, 0.05);
  transition: border-color var(--transition-fast);
}

.loop-step:hover {
  border-color: rgba(0, 240, 255, 0.2);
}

.loop-step-highlight {
  border-color: var(--color-primary);
  background-color: rgba(0, 240, 255, 0.05);
}

.loop-icon {
  font-size: var(--text-xl);
  flex-shrink: 0;
}

.loop-text {
  font-size: var(--text-sm);
  color: var(--color-text);
}

.loop-arrow {
  font-size: var(--text-lg);
  color: var(--color-text-dim);
  line-height: 1;
}

.loop-arrow-return {
  font-size: var(--text-2xl);
  color: var(--color-primary);
  margin-top: var(--space-2);
}

.loop-caption {
  margin-top: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-style: italic;
}

/* ==========================================================================
   FEATURE CARDS
   ========================================================================== */

.feature-cards {
  display: grid;
  gap: var(--space-5);
  margin-top: var(--space-6);
}

.feature-card {
  display: flex;
  flex-direction: column;
  padding: var(--space-5);
  background-color: var(--color-bg-elevated);
  border-radius: var(--border-radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.05);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

@media (min-width: 768px) {
  .feature-card {
    flex-direction: row;
    align-items: flex-start;
    gap: var(--space-5);
  }
}

.feature-card:hover {
  border-color: rgba(0, 240, 255, 0.2);
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.05);
}

.feature-icon {
  font-size: var(--text-3xl);
  display: block;
  margin-bottom: var(--space-3);
  flex-shrink: 0;
}

@media (min-width: 768px) {
  .feature-icon {
    margin-bottom: 0;
  }
}

.feature-card h3 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-3);
}

.feature-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: var(--leading-relaxed);
}

/* ==========================================================================
   COMPARISON (Before/After)
   ========================================================================== */

.comparison-grid {
  display: grid;
  gap: var(--space-6);
  margin-top: var(--space-6);
}

@media (min-width: 768px) {
  .comparison-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.comparison-panel {
  border-radius: var(--border-radius-lg);
  overflow: hidden;
}

.comparison-label {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-base);
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
}

.token-badge {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  font-weight: var(--weight-normal);
  background-color: var(--color-bg-surface);
  border-radius: 100px;
  color: var(--color-text-muted);
}

.token-badge-highlight {
  background-color: rgba(0, 240, 255, 0.15);
  color: var(--color-primary);
  border: 1px solid rgba(0, 240, 255, 0.3);
}

.comparison-code {
  padding: var(--space-4);
  background-color: var(--color-bg-surface);
  border-radius: var(--border-radius);
  overflow-x: auto;
  font-size: var(--text-xs);
  line-height: var(--leading-relaxed);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.comparison-code code {
  background: none;
  padding: 0;
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  white-space: pre-wrap;
  word-break: break-word;
}

.comparison-before .comparison-code {
  border-color: rgba(255, 255, 255, 0.08);
}

.comparison-after .comparison-code {
  border-color: rgba(0, 240, 255, 0.15);
}

.code-dimmed {
  color: var(--color-text-dim);
  font-style: italic;
}

.code-highlight {
  color: var(--color-primary);
  font-weight: var(--weight-medium);
}

.comparison-note {
  margin-top: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-primary);
  font-style: italic;
}

/* ==========================================================================
   CJK EXPLAINER
   ========================================================================== */

.cjk-explainer {
  margin-top: var(--space-8);
  padding: var(--space-5);
  background-color: var(--color-bg-surface);
  border-radius: var(--border-radius-lg);
  border-left: 3px solid var(--color-secondary);
}

.cjk-explainer h3 {
  color: var(--color-secondary);
}

.cjk-example {
  font-size: var(--text-2xl);
  color: var(--color-secondary);
  text-shadow: var(--text-glow-secondary);
  vertical-align: middle;
}

/* ==========================================================================
   START COMMAND
   ========================================================================== */

/* Featured Install (OpenClaw) */

.install-featured {
  padding: var(--space-5);
  background-color: var(--color-bg-elevated);
  border-radius: var(--border-radius-lg);
  border: 1px solid rgba(0, 240, 255, 0.25);
  margin: var(--space-5) 0 var(--space-4);
}

.install-featured h4 {
  font-family: var(--font-headline);
  font-size: var(--text-xl);
  font-weight: var(--weight-semibold);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.install-badge {
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  color: var(--color-primary);
  border: 1px solid rgba(0, 240, 255, 0.4);
  border-radius: 999px;
  padding: 0.15em 0.6em;
  margin-left: var(--space-2);
  vertical-align: middle;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.install-featured-desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
  line-height: var(--leading-relaxed);
}

/* Install Grid (other options) */

.install-grid {
  display: grid;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.install-option {
  padding: var(--space-4);
  background-color: var(--color-bg-surface);
  border-radius: var(--border-radius);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.install-option h4 {
  font-family: var(--font-headline);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.install-code {
  padding: var(--space-2) var(--space-3);
  background-color: var(--color-bg);
  border-radius: calc(var(--border-radius) / 2);
  margin: 0;
}

.install-code code {
  font-size: var(--text-sm);
  color: var(--color-primary);
  background: none;
  padding: 0;
}

.install-note {
  font-size: var(--text-sm);
  color: var(--color-text);
  margin: 0;
  padding: var(--space-2) 0;
}

.install-note a {
  color: var(--color-primary);
}

.install-then {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-2);
}

/* Start Command */

.start-command {
  margin: var(--space-4) 0 var(--space-6);
}

.command-code {
  padding: var(--space-4) var(--space-5);
  background-color: var(--color-bg-surface);
  border-radius: var(--border-radius);
  border: 1px solid rgba(0, 240, 255, 0.2);
  text-align: center;
}

.command-code code {
  font-size: var(--text-lg);
  color: var(--color-primary);
  background: none;
  padding: 0;
}

.command-caption {
  margin-top: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.command-caption code {
  white-space: nowrap;
}

/* ==========================================================================
   FOOTER TAGLINE
   ========================================================================== */

.footer-tagline {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  font-style: italic;
  margin-bottom: var(--space-6);
}

/* ==========================================================================
   RESPONSIVE - 320px (small mobile)
   ========================================================================== */

@media (max-width: 320px) {
  .container {
    padding-left: var(--space-3);
    padding-right: var(--space-3);
  }

  .hero-heading {
    font-size: var(--text-2xl);
  }

  .btn {
    width: 100%;
  }
}