/* ==========================================================================
   BOTCHAN — DEVELOPER PORTFOLIO STYLESHEET (style.css)
   Design System: Technical, minimal, 1px hairline borders, zero gradients,
   zero shadows, zero neon effects.
   ========================================================================== */

:root,
[data-theme="light"] {
  --bg: #F2EBE4;
  --surface: #EAE1D8;
  --text: #0D141B;
  --muted: #6B6B6B;
  --accent: #5B6248;
  --border: #CFC7BE;

  --font-heading: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  --container-max: 1200px;
  --section-pad-y: 5.5rem;
}

[data-theme="dark"] {
  --bg: #0E0E0E;
  --surface: #161616;
  --text: #E9E1D5;
  --muted: #8E8A82;
  --accent: #A3AD86;
  --border: #2A2A28;
}

/* ==========================================================================
   BASE & RESET
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  transition: background-color 160ms ease, color 160ms ease;
}

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  list-style: none;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

:focus-visible {
  outline: 1px solid var(--accent);
  outline-offset: 3px;
}

/* ==========================================================================
   TYPOGRAPHY & LABELS
   ========================================================================== */

h1,
h2,
h3,
h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.mono-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.mono-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

/* ==========================================================================
   LAYOUT CONTAINERS
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 2rem;
}

.site-main {
  flex: 1;
}

/* ==========================================================================
   TOP BAR (3-Zone Contract)
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background-color: var(--bg);
  border-bottom: 1px solid var(--border);
  transition: background-color 160ms ease, border-color 160ms ease;
}

.header-inner {
  height: 4rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.brand-mark {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  white-space: nowrap;
  flex-shrink: 0;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  white-space: nowrap;
  flex-shrink: 0;
  padding: 0.25rem 0;
  border-bottom: 1px solid transparent;
  transition: color 150ms ease, border-color 150ms ease;
}

.nav-link:hover {
  color: var(--text);
  border-bottom-color: var(--accent);
}

.theme-toggle {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.5rem 0.875rem;
  border: 1px solid var(--border);
  background-color: var(--bg);
  color: var(--text);
  white-space: nowrap;
  flex-shrink: 0;
  min-height: 2.5rem;
  transition: border-color 150ms ease, background-color 150ms ease, color 150ms ease;
}

.theme-toggle:hover {
  border-color: var(--accent);
  background-color: var(--surface);
}

/* ==========================================================================
   HERO SECTION & 3D GRAPH STAGE
   ========================================================================== */

.hero-section {
  padding: 4rem 0 5rem;
  border-bottom: 1px solid var(--border);
}

.hero-grid {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: 3rem;
  align-items: stretch;
}

.hero-content {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.75rem;
  min-width: 0;
}

.hero-meta-row {
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.hero-title {
  font-size: clamp(2.25rem, 3.6vw, 3.25rem);
  color: var(--text);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.hero-subtitle {
  display: block;
  font-family: var(--font-heading);
  font-size: clamp(1.125rem, 1.5vw, 1.375rem);
  font-weight: 500;
  line-height: 1.35;
  color: var(--accent);
  letter-spacing: -0.01em;
}

.hero-description {
  font-size: 0.96875rem;
  color: var(--muted);
  max-width: 60ch;
  line-height: 1.65;
}

/* Active Commit Readout Box */
.commit-inspector {
  border: 1px solid var(--border);
  background-color: var(--surface);
  padding: 1.125rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.inspector-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

#inspector-branch {
  color: var(--accent);
}

.inspector-message {
  font-family: var(--font-mono);
  font-size: 0.84375rem;
  color: var(--text);
  line-height: 1.5;
  min-height: 2.5rem;
  display: flex;
  align-items: center;
}

.inspector-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  padding-top: 0.25rem;
}

/* Hero Buttons */
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

.btn-outline {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.625rem 1.125rem;
  border: 1px solid var(--text);
  color: var(--text);
  background-color: transparent;
  min-height: 2.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
  transition: background-color 150ms ease, color 150ms ease, border-color 150ms ease;
}

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

.btn-subtle {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.625rem 1rem;
  border: 1px solid var(--border);
  color: var(--muted);
  background-color: transparent;
  min-height: 2.5rem;
  white-space: nowrap;
  transition: border-color 150ms ease, color 150ms ease;
}

.btn-subtle:hover {
  border-color: var(--accent);
  color: var(--text);
}

/* 3D Graph Stage Framing */
.hero-stage-wrapper {
  border: 1px solid var(--border);
  background-color: var(--bg);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-width: 0;
}

.stage-topbar {
  padding: 0.75rem 1.125rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.stage-legend {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
}

.legend-swatch {
  width: 0.5rem;
  height: 0.5rem;
  display: inline-block;
  border: 1px solid var(--border);
}

.swatch-main {
  background-color: var(--text);
}

.swatch-side {
  background-color: var(--accent);
}

.graph-container {
  position: relative;
  width: 100%;
  height: 440px;
  overflow: hidden;
  cursor: grab;
  user-select: none;
}

.graph-container:active {
  cursor: grabbing;
}

#commit-graph-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* 2D SVG Fallback */
.svg-fallback-container {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.svg-fallback-container[hidden] {
  display: none;
}

.fallback-svg {
  width: 100%;
  height: 100%;
  max-height: 390px;
  overflow: visible;
}

/* HTML Commit Tooltip */
.commit-tooltip {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 20;
  pointer-events: none;
  background-color: var(--bg);
  border: 1px solid var(--text);
  padding: 0.625rem 0.875rem;
  min-width: 210px;
  max-width: 280px;
  transition: opacity 120ms ease, transform 120ms ease;
}

.commit-tooltip[hidden] {
  display: none;
}

.tooltip-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding-bottom: 0.375rem;
  margin-bottom: 0.375rem;
  border-bottom: 1px solid var(--border);
}

.tooltip-hash {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text);
}

.tooltip-branch {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
}

.tooltip-message {
  font-family: var(--font-body);
  font-size: 0.8125rem;
  color: var(--text);
  line-height: 1.4;
  margin-bottom: 0.25rem;
}

.tooltip-date {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--muted);
  display: block;
}

/* Bottom Commit Sequence Bar */
.stage-bottombar {
  padding: 0.625rem 1.125rem;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.commit-node-buttons {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.375rem;
}

.node-chip-btn {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--border);
  background-color: var(--bg);
  color: var(--muted);
  min-height: 1.75rem;
  transition: border-color 120ms ease, color 120ms ease, background-color 120ms ease;
}

.node-chip-btn:hover,
.node-chip-btn.is-selected {
  border-color: var(--accent);
  color: var(--text);
  background-color: var(--surface);
}

/* ==========================================================================
   SECTIONS SHARED STRUCTURE (01 - 04)
   ========================================================================== */

.portfolio-section {
  padding: var(--section-pad-y) 0;
  border-bottom: 1px solid var(--border);
}

.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.25rem;
  padding-bottom: 1.5rem;
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.section-number {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.08em;
}

.section-title {
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  color: var(--text);
  margin-right: auto;
}

.section-kicker {
  margin-left: auto;
}

/* ==========================================================================
   01. NOW BUILDING
   ========================================================================== */

.building-card {
  border: 1px solid var(--border);
  background-color: var(--surface);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.building-card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}

.building-title-group {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.building-project-name {
  font-size: 1.5rem;
  color: var(--text);
}

.status-selector-group {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  flex-wrap: wrap;
}

.status-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  padding: 0.25rem 0.625rem;
  border: 1px solid var(--accent);
  background-color: var(--bg);
}

.btn-micro {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.3125rem 0.625rem;
  border: 1px solid var(--border);
  color: var(--muted);
  background-color: var(--bg);
  min-height: 2rem;
  transition: border-color 150ms ease, color 150ms ease;
}

.btn-micro:hover {
  border-color: var(--text);
  color: var(--text);
}

.building-note {
  font-size: 1rem;
  color: var(--text);
  max-width: 72ch;
  line-height: 1.7;
}

.building-meta-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.625rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border);
}

/* ==========================================================================
   02. LOG
   ========================================================================== */

.log-filter-bar {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  flex-wrap: wrap;
}

.filter-btn {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.375rem 0.75rem;
  border: 1px solid var(--border);
  color: var(--muted);
  background-color: transparent;
  min-height: 2.25rem;
  white-space: nowrap;
  transition: border-color 150ms ease, color 150ms ease, background-color 150ms ease;
}

.filter-btn:hover {
  border-color: var(--accent);
  color: var(--text);
}

.filter-btn.is-active {
  border-color: var(--text);
  background-color: var(--text);
  color: var(--bg);
}

.log-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border);
}

.log-item {
  display: grid;
  grid-template-columns: 140px 140px 1fr;
  gap: 1.5rem;
  align-items: baseline;
  padding: 1.375rem 0;
  border-bottom: 1px solid var(--border);
}

.log-item[hidden] {
  display: none;
}

.log-date {
  color: var(--muted);
}

.log-topic {
  color: var(--accent);
}

.log-text {
  font-size: 0.96875rem;
  color: var(--text);
  line-height: 1.65;
  max-width: 70ch;
}

/* ==========================================================================
   03. PROJECTS (3 Minimalist Cards)
   ========================================================================== */

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.project-card {
  border: 1px solid var(--border);
  background-color: var(--bg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.25rem;
  transition: border-color 150ms ease, background-color 150ms ease;
}

.project-card:hover {
  border-color: var(--accent);
  background-color: var(--surface);
}

.project-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding-bottom: 0.875rem;
  border-bottom: 1px solid var(--border);
}

.project-status {
  color: var(--accent);
}

.project-title {
  font-size: 1.25rem;
  color: var(--text);
}

.project-summary {
  font-size: 0.9375rem;
  color: var(--muted);
  line-height: 1.6;
  flex: 1;
}

.project-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.project-link {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text);
  border-bottom: 1px solid var(--accent);
  padding-bottom: 0.125rem;
  white-space: nowrap;
  transition: color 150ms ease;
}

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

/* ==========================================================================
   04. STACK
   ========================================================================== */

.stack-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border);
}

.stack-item {
  display: grid;
  grid-template-columns: 180px 300px 1fr;
  gap: 1.5rem;
  align-items: baseline;
  padding: 1.375rem 0;
  border-bottom: 1px solid var(--border);
}

.stack-name-col {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}

.stack-index {
  color: var(--accent);
}

.stack-name {
  font-family: var(--font-heading);
  font-size: 1.1875rem;
  font-weight: 600;
  color: var(--text);
}

.stack-focus {
  color: var(--accent);
  white-space: normal;
}

.stack-note {
  font-size: 0.9375rem;
  color: var(--muted);
  line-height: 1.6;
}

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

.site-footer {
  padding: 2.5rem 0;
  background-color: var(--bg);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  flex-wrap: wrap;
}

.footer-link {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text);
  border-bottom: 1px solid transparent;
  padding-bottom: 0.125rem;
  transition: border-color 150ms ease, color 150ms ease;
}

.footer-link:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ==========================================================================
   RESPONSIVE & ACCESSIBILITY MEDIA QUERIES
   ========================================================================== */

@media (max-width: 980px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.25rem;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .stack-item {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .log-item {
    grid-template-columns: 120px 1fr;
    gap: 0.5rem 1rem;
  }

  .log-text {
    grid-column: 1 / -1;
  }
}

@media (max-width: 767px) {
  :root {
    --section-pad-y: 3.5rem;
  }

  .container {
    padding: 0 1.125rem;
  }

  .site-nav {
    display: none;
  }

  .mono-label {
    white-space: normal;
  }

  .inspector-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }

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

  .btn-outline,
  .btn-subtle {
    width: 100%;
    justify-content: center;
  }

  .graph-container {
    height: 340px;
  }

  /* Disable tooltip animations on mobile per performance specification */
  .commit-tooltip {
    transition: none !important;
  }

  .log-item {
    grid-template-columns: 1fr;
    gap: 0.375rem;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}