/* === PRIMITIVE TOKENS === */
:root {
  --color-ink-950: #041018;
  --color-ink-900: #081a26;
  --color-ink-800: #102c3a;
  --color-ink-700: #27424f;
  --color-paper-100: #f5f3ee;
  --color-paper-50: #fbfaf7;
  --color-white: #ffffff;
  --color-signal-500: #ffb703;
  --color-signal-600: #eaa500;
  --color-cyan-500: #22b8c7;
  --color-cyan-600: #087d89;
  --color-gray-700: #45545b;
  --color-gray-600: #5d6970;
  --color-gray-400: #9aa6ac;
  --color-gray-200: #d8dedf;
  --color-gray-100: #e9edec;
  --color-danger-500: #b63f3f;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;
  --space-32: 128px;

  --font-sans: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  --font-display: "Poppins", "Noto Sans TC", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --font-xs: 0.75rem;
  --font-sm: 0.875rem;
  --font-base: 1rem;
  --font-lg: 1.125rem;
  --font-xl: 1.25rem;
  --font-2xl: 1.5rem;
  --font-3xl: 2rem;
  --font-4xl: 2.75rem;
  --font-5xl: 4rem;
  --font-6xl: 5.5rem;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 32px;
  --radius-pill: 999px;
  --shadow-sm: 0 8px 24px rgb(4 16 24 / 8%);
  --shadow-md: 0 22px 64px rgb(4 16 24 / 14%);
  --shadow-lift: 0 28px 80px rgb(4 16 24 / 18%);
  --duration-fast: 160ms;
  --duration-normal: 260ms;
  --ease-out: cubic-bezier(.2, .8, .2, 1);
  --control-min: 44px;
}

/* === SEMANTIC TOKENS === */
:root {
  --color-background: var(--color-paper-100);
  --color-surface: var(--color-white);
  --color-surface-muted: var(--color-paper-50);
  --color-foreground: var(--color-ink-900);
  --color-heading: var(--color-ink-950);
  --color-muted: var(--color-gray-600);
  --color-subtle: var(--color-gray-100);
  --color-border: var(--color-gray-200);
  --color-border-strong: var(--color-ink-700);
  --color-signal: var(--color-signal-500);
  --color-signal-hover: var(--color-signal-600);
  --color-accent: var(--color-cyan-500);
  --color-accent-strong: var(--color-cyan-600);
  --color-dark-surface: var(--color-ink-900);
  --color-dark-surface-alt: var(--color-ink-800);
  --color-on-dark: var(--color-paper-100);
  --color-on-dark-muted: var(--color-gray-400);
  --color-focus: var(--color-cyan-500);
  --spacing-page: clamp(var(--space-5), 4vw, var(--space-16));
  --spacing-section: clamp(var(--space-20), 10vw, var(--space-32));
  --content-max: 1200px;
  --reading-max: 760px;
}

/* === COMPONENT TOKENS === */
:root {
  --button-primary-bg: var(--color-signal);
  --button-primary-bg-hover: var(--color-signal-hover);
  --button-primary-fg: var(--color-ink-950);
  --button-secondary-bg: transparent;
  --button-secondary-fg: var(--color-foreground);
  --button-secondary-border: var(--color-border-strong);
  --card-bg: var(--color-surface);
  --card-border: var(--color-border);
  --card-radius: var(--radius-lg);
  --card-padding: clamp(var(--space-6), 3vw, var(--space-10));
  --header-bg: rgb(245 243 238 / 92%);
  --header-border: var(--color-border);
  --chip-bg: var(--color-surface);
  --chip-active-bg: var(--color-ink-900);
  --chip-active-fg: var(--color-on-dark);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 110px;
}

body {
  margin: 0;
  overflow-x: hidden;
  background: var(--color-background);
  color: var(--color-foreground);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
}

body::before {
  position: fixed;
  z-index: -1;
  inset: 0;
  background-image:
    linear-gradient(rgb(8 26 38 / 3%) 1px, transparent 1px),
    linear-gradient(90deg, rgb(8 26 38 / 3%) 1px, transparent 1px);
  background-size: 48px 48px;
  content: "";
  pointer-events: none;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

a {
  color: inherit;
  text-decoration-color: var(--color-accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

a:hover {
  text-decoration-color: var(--color-signal);
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  color: inherit;
}

img,
svg,
video {
  display: block;
  max-width: 100%;
}

img {
  height: auto;
}

h1,
h2,
h3,
p,
ul,
ol,
figure,
blockquote {
  margin-top: 0;
}

h1,
h2,
h3 {
  color: var(--color-heading);
  font-family: var(--font-display);
  letter-spacing: -0.035em;
  line-height: 1.12;
}

h1 {
  font-size: clamp(var(--font-4xl), 8vw, var(--font-6xl));
}

h2 {
  font-size: clamp(var(--font-3xl), 5vw, var(--font-5xl));
}

h3 {
  font-size: clamp(var(--font-xl), 3vw, var(--font-3xl));
}

:focus-visible {
  border-radius: var(--radius-sm);
  outline: 3px solid var(--color-focus);
  outline-offset: 4px;
}

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  overflow: hidden !important;
  clip: rect(0 0 0 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

[hidden] {
  display: none !important;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: var(--space-4);
  left: var(--space-4);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-pill);
  background: var(--color-ink-900);
  color: var(--color-on-dark);
  transform: translateY(-180%);
  transition: transform var(--duration-fast) var(--ease-out);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  z-index: 100;
  top: 0;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-8);
  min-height: 78px;
  padding: var(--space-3) var(--spacing-page);
  border-bottom: 1px solid var(--header-border);
  background: var(--header-bg);
  backdrop-filter: blur(18px);
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-heading);
  font-family: var(--font-display);
  font-weight: 700;
  text-decoration: none;
}

.site-brand-mark {
  display: grid;
  width: var(--control-min);
  height: var(--control-min);
  place-items: center;
  border-radius: 50%;
  background: var(--color-ink-900);
  color: var(--color-signal);
  font-size: var(--font-xs);
  letter-spacing: .08em;
}

.site-nav {
  justify-self: end;
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: clamp(var(--space-4), 2vw, var(--space-8));
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav a {
  color: var(--color-muted);
  font-size: var(--font-sm);
  font-weight: 700;
  text-decoration: none;
}

.site-nav a:hover {
  color: var(--color-foreground);
}

.header-action,
.button {
  display: inline-flex;
  min-height: var(--control-min);
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-weight: 800;
  line-height: 1.2;
  text-decoration: none;
  transition:
    transform var(--duration-fast) var(--ease-out),
    background var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out),
    box-shadow var(--duration-fast) var(--ease-out);
}

.header-action,
.button-primary {
  background: var(--button-primary-bg);
  color: var(--button-primary-fg);
  box-shadow: var(--shadow-sm);
}

.header-action:hover,
.button-primary:hover {
  background: var(--button-primary-bg-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.button-secondary {
  border-color: var(--button-secondary-border);
  background: var(--button-secondary-bg);
  color: var(--button-secondary-fg);
}

.button-secondary:hover {
  background: var(--color-ink-900);
  color: var(--color-on-dark);
  transform: translateY(-2px);
}

.page-shell,
.section-shell,
.case-shell {
  width: min(100% - (var(--spacing-page) * 2), var(--content-max));
  margin-inline: auto;
}

.section-block {
  padding-block: var(--spacing-section);
}

.section-block-dark {
  background: var(--color-dark-surface);
  color: var(--color-on-dark);
}

.section-block-dark h2,
.section-block-dark h3 {
  color: var(--color-on-dark);
}

.eyebrow,
.section-index,
.project-kicker,
.case-label {
  color: var(--color-accent-strong);
  font-family: var(--font-mono);
  font-size: var(--font-xs);
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.section-block-dark .eyebrow,
.section-block-dark .section-index,
.section-block-dark .project-kicker {
  color: var(--color-accent);
}

.hero {
  position: relative;
  display: grid;
  min-height: min(900px, calc(100svh - 78px));
  align-items: center;
  overflow: hidden;
  padding-block: clamp(var(--space-16), 8vw, 104px);
}

.hero::after {
  position: absolute;
  z-index: -1;
  top: 8%;
  right: -12%;
  width: min(52vw, 720px);
  aspect-ratio: 1;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  background:
    radial-gradient(circle at center, transparent 48%, rgb(34 184 199 / 8%) 49%, transparent 50%),
    radial-gradient(circle at center, transparent 66%, rgb(255 183 3 / 14%) 67%, transparent 68%);
  content: "";
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 8fr) minmax(260px, 3fr);
  gap: clamp(var(--space-10), 7vw, var(--space-24));
  align-items: end;
}

.hero h1 {
  max-width: 880px;
  margin-bottom: var(--space-8);
  font-size: clamp(var(--font-4xl), 6vw, 4.25rem);
}

.hero-lead {
  max-width: 760px;
  margin-bottom: var(--space-10);
  color: var(--color-muted);
  font-size: clamp(var(--font-lg), 2vw, var(--font-2xl));
}

.hero-actions,
.project-actions,
.case-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.hero-note {
  align-self: stretch;
  padding: var(--space-8);
  border-left: 1px solid var(--color-border-strong);
  background: rgb(255 255 255 / 54%);
}

.hero-note strong {
  display: block;
  margin-bottom: var(--space-4);
  font-family: var(--font-display);
  font-size: var(--font-xl);
}

.hero-note ol {
  margin: 0;
  padding-left: var(--space-5);
  color: var(--color-muted);
}

.proof-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--color-border-strong);
  border-bottom: 1px solid var(--color-border-strong);
}

.proof-item {
  min-height: 180px;
  padding: var(--space-8);
  border-right: 1px solid var(--color-border-strong);
  text-decoration: none;
}

.proof-item:last-child {
  border-right: 0;
}

.proof-value {
  display: block;
  margin-bottom: var(--space-4);
  color: var(--color-heading);
  font-family: var(--font-display);
  font-size: clamp(var(--font-3xl), 5vw, var(--font-5xl));
  font-weight: 700;
  letter-spacing: -.05em;
  line-height: 1;
}

.proof-label {
  color: var(--color-muted);
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(80px, 1fr) minmax(0, 7fr) minmax(180px, 3fr);
  gap: var(--space-8);
  align-items: start;
  margin-bottom: clamp(var(--space-12), 7vw, var(--space-24));
}

.section-heading h2 {
  margin-bottom: 0;
}

.section-intro {
  color: var(--color-muted);
}

.section-block-dark .section-intro {
  color: var(--color-on-dark-muted);
}

.capability-grid,
.project-grid,
.summary-grid,
.media-grid {
  display: grid;
  gap: var(--space-6);
}

.capability-grid {
  grid-template-columns: repeat(3, 1fr);
}

.capability-card {
  min-height: 420px;
  padding: var(--card-padding);
  border: 1px solid var(--card-border);
  border-radius: var(--card-radius);
  background: var(--card-bg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--duration-normal) var(--ease-out), box-shadow var(--duration-normal) var(--ease-out);
}

.capability-card:hover {
  box-shadow: var(--shadow-lift);
  transform: translateY(-8px);
}

.capability-number {
  display: block;
  margin-bottom: var(--space-20);
  color: var(--color-accent-strong);
  font-family: var(--font-mono);
  font-size: var(--font-sm);
}

.capability-card p,
.capability-card li {
  color: var(--color-muted);
}

.capability-card ul {
  padding-left: var(--space-5);
}

.project-grid {
  grid-template-columns: repeat(12, 1fr);
}

.project-card {
  grid-column: span 6;
  overflow: hidden;
  border: 1px solid var(--card-border);
  border-radius: var(--card-radius);
  background: var(--card-bg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--duration-normal) var(--ease-out), box-shadow var(--duration-normal) var(--ease-out);
}

.project-card:nth-child(3n + 1) {
  grid-column: span 7;
}

.project-card:nth-child(3n + 2) {
  grid-column: span 5;
}

.project-card:hover {
  box-shadow: var(--shadow-lift);
  transform: translateY(-8px);
}

.category-business-systems {
  --repo-accent: #2dd4bf;
  --repo-accent-soft: rgb(45 212 191 / 16%);
}

.category-ai-knowledge {
  --repo-accent: #8b5cf6;
  --repo-accent-soft: rgb(139 92 246 / 16%);
}

.category-interactive-games {
  --repo-accent: #f43f5e;
  --repo-accent-soft: rgb(244 63 94 / 15%);
}

.category-finance-tools {
  --repo-accent: #f59e0b;
  --repo-accent-soft: rgb(245 158 11 / 17%);
}

.category-automation-tools {
  --repo-accent: #3b82f6;
  --repo-accent-soft: rgb(59 130 246 / 16%);
}

.category-personal-experiments {
  --repo-accent: #84cc16;
  --repo-accent-soft: rgb(132 204 22 / 16%);
}

.repository-map-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}

.repository-category-card {
  position: relative;
  display: grid;
  min-height: 330px;
  align-content: end;
  gap: var(--space-3);
  overflow: hidden;
  padding: var(--space-8);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(circle at 82% 16%, var(--repo-accent-soft), transparent 34%),
    var(--color-surface);
  color: var(--color-ink-900);
  text-decoration: none;
  transition: transform var(--duration-normal) var(--ease-out), border-color var(--duration-normal) var(--ease-out), box-shadow var(--duration-normal) var(--ease-out);
}

.repository-category-card::before {
  position: absolute;
  top: 0;
  right: 12%;
  width: 42%;
  height: 3px;
  background: var(--repo-accent);
  content: '';
}

.repository-category-card:hover {
  border-color: var(--repo-accent);
  box-shadow: var(--shadow-lift);
  transform: translateY(-6px);
}

.repository-category-count {
  position: absolute;
  top: var(--space-6);
  right: var(--space-6);
  color: var(--repo-accent);
  font-family: var(--font-mono);
  font-size: clamp(3.5rem, 7vw, 6.5rem);
  font-weight: 800;
  letter-spacing: -0.08em;
  line-height: 1;
  opacity: 0.34;
}

.repository-category-card h3 {
  max-width: 10ch;
  margin: 0;
  font-size: clamp(var(--font-2xl), 3.2vw, var(--font-4xl));
}

.repository-category-card > p:not(.project-kicker),
.repository-category-names {
  color: var(--color-muted);
}

.repository-category-names {
  min-height: 2.8em;
  font-family: var(--font-mono);
  font-size: var(--font-xs);
}

.repo-hero-note {
  position: relative;
  overflow: hidden;
}

.repo-hero-number {
  display: block;
  margin-bottom: var(--space-8);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: clamp(5rem, 12vw, 10rem);
  font-weight: 900;
  letter-spacing: -0.1em;
  line-height: 0.75;
}

.repo-grid .project-card {
  grid-column: span 4;
  display: flex;
  min-height: 520px;
  flex-direction: column;
}

.repo-card-identity {
  position: relative;
  display: flex;
  min-height: 180px;
  align-items: flex-end;
  overflow: hidden;
  padding: var(--space-6);
  background:
    linear-gradient(135deg, var(--repo-accent-soft), transparent 60%),
    var(--color-ink-900);
  color: var(--color-on-dark);
}

.repo-card-identity::before,
.repo-card-identity::after {
  position: absolute;
  border: 1px solid var(--repo-accent);
  border-radius: 50%;
  content: '';
  opacity: 0.55;
}

.repo-card-identity::before {
  top: -70px;
  right: -10px;
  width: 180px;
  height: 180px;
}

.repo-card-identity::after {
  top: 30px;
  right: 48px;
  width: 80px;
  height: 80px;
}

.repo-card-mark {
  color: var(--repo-accent);
  font-family: var(--font-mono);
  font-size: clamp(3.4rem, 7vw, 5.5rem);
  font-weight: 900;
  letter-spacing: -0.08em;
  line-height: 0.8;
}

.repo-card-path {
  position: absolute;
  top: var(--space-5);
  left: var(--space-6);
  max-width: calc(100% - var(--space-12));
  overflow: hidden;
  color: var(--color-on-dark-muted);
  font-family: var(--font-mono);
  font-size: var(--font-xs);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.repo-card .project-card-body {
  flex: 1;
  grid-template-rows: auto auto minmax(5em, 1fr) auto auto;
}

.repo-card h2 {
  overflow-wrap: anywhere;
}

.repo-summary {
  color: var(--color-muted);
}

.project-card-media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--color-subtle);
}

.project-card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 700ms var(--ease-out);
}

.project-card:hover .project-card-media img {
  transform: scale(1.035);
}

.project-tier {
  position: absolute;
  top: var(--space-4);
  left: var(--space-4);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-pill);
  background: var(--color-ink-900);
  color: var(--color-on-dark);
  font-size: var(--font-xs);
  font-weight: 800;
}

.project-card-body {
  display: grid;
  gap: var(--space-5);
  padding: var(--card-padding);
}

.project-card h2,
.project-card h3 {
  margin-bottom: 0;
  font-size: clamp(var(--font-2xl), 3vw, var(--font-3xl));
}

.project-problem {
  color: var(--color-muted);
}

.project-meta,
.case-meta,
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.project-meta li,
.case-meta li,
.tag {
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  color: var(--color-muted);
  font-size: var(--font-xs);
}

.filter-panel {
  display: grid;
  gap: var(--space-5);
  margin-bottom: var(--space-12);
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: rgb(255 255 255 / 68%);
}

.repo-library {
  padding-block: clamp(var(--space-16), 7vw, var(--space-24));
}

.repo-library .section-heading {
  margin-bottom: clamp(var(--space-10), 5vw, var(--space-16));
}

.repo-library .section-heading h1 {
  margin-bottom: 0;
  font-size: clamp(var(--font-4xl), 6.4vw, 4.75rem);
}

.repo-search {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: var(--space-4);
  align-items: center;
}

.repo-search > span {
  color: var(--color-muted);
  font-size: var(--font-sm);
  font-weight: 800;
}

.repo-search input {
  min-height: 52px;
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-ink-900);
  font: inherit;
}

.repo-search input::placeholder {
  color: var(--color-muted);
}

.filter-result {
  margin: 0;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: var(--font-sm);
  text-align: right;
}

.filter-group {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: var(--space-4);
  align-items: start;
}

.filter-group-label {
  padding-top: var(--space-2);
  color: var(--color-muted);
  font-size: var(--font-sm);
  font-weight: 800;
}

.filter-options {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.filter-chip {
  min-height: var(--control-min);
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--chip-bg);
  cursor: pointer;
  font-size: var(--font-sm);
  font-weight: 700;
}

.filter-chip[aria-pressed="true"] {
  border-color: var(--chip-active-bg);
  background: var(--chip-active-bg);
  color: var(--chip-active-fg);
}

.filter-empty {
  padding: var(--space-12);
  border: 1px dashed var(--color-border-strong);
  text-align: center;
}

.method-rail {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  counter-reset: method;
}

.method-step {
  position: relative;
  min-height: 320px;
  padding: var(--space-8);
  border-top: 1px solid var(--color-gray-700);
  border-right: 1px solid var(--color-gray-700);
}

.method-step:last-child {
  border-right: 0;
}

.method-step-number {
  display: block;
  margin-bottom: var(--space-20);
  color: var(--color-signal);
  font-family: var(--font-mono);
}

.method-step p {
  color: var(--color-on-dark-muted);
}

.timeline {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--color-border-strong);
}

.timeline-item {
  display: grid;
  grid-template-columns: minmax(140px, 2fr) minmax(240px, 4fr) minmax(0, 5fr);
  gap: var(--space-8);
  padding-block: var(--space-8);
  border-bottom: 1px solid var(--color-border);
}

.timeline-period {
  color: var(--color-accent-strong);
  font-family: var(--font-mono);
  font-size: var(--font-sm);
  font-weight: 800;
}

.timeline-item h3 {
  margin-bottom: 0;
  font-size: var(--font-xl);
}

.timeline-item p {
  margin-bottom: 0;
  color: var(--color-muted);
}

.case-hero {
  position: relative;
  padding-block: clamp(var(--space-16), 9vw, var(--space-24));
  overflow: hidden;
  background: var(--color-dark-surface);
  color: var(--color-on-dark);
}

.case-hero::after {
  position: absolute;
  right: -12vw;
  bottom: -18vw;
  width: 48vw;
  aspect-ratio: 1;
  border: 1px solid var(--color-gray-700);
  border-radius: 50%;
  content: "";
}

.case-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 8fr) minmax(260px, 4fr);
  gap: var(--space-12);
  align-items: end;
}

.case-hero h1 {
  margin-bottom: var(--space-8);
  color: var(--color-on-dark);
  font-size: clamp(var(--font-3xl), 5vw, 5rem);
}

.case-problem {
  max-width: var(--reading-max);
  color: var(--color-on-dark-muted);
  font-size: clamp(var(--font-lg), 2vw, var(--font-2xl));
}

.repo-identity {
  position: relative;
  display: grid;
  min-height: 390px;
  align-content: space-between;
  overflow: hidden;
  padding: var(--space-8);
  border: 1px solid rgb(255 255 255 / 16%);
  border-radius: var(--radius-xl);
  background:
    radial-gradient(circle at 80% 18%, var(--repo-accent-soft), transparent 36%),
    linear-gradient(145deg, rgb(255 255 255 / 5%), transparent 58%),
    var(--color-ink-900);
  box-shadow: var(--shadow-lift);
}

.repo-identity::before,
.repo-identity::after {
  position: absolute;
  border: 1px solid var(--repo-accent);
  border-radius: 50%;
  content: '';
  opacity: 0.45;
}

.repo-identity::before {
  top: -70px;
  right: -40px;
  width: 240px;
  height: 240px;
}

.repo-identity::after {
  top: 56px;
  right: 66px;
  width: 92px;
  height: 92px;
}

.repo-identity-owner,
.repo-identity-name {
  position: relative;
  z-index: 1;
  overflow-wrap: anywhere;
  color: var(--color-on-dark-muted);
  font-family: var(--font-mono);
  font-size: var(--font-xs);
}

.repo-identity strong {
  position: relative;
  z-index: 1;
  color: var(--repo-accent);
  font-family: var(--font-mono);
  font-size: clamp(5rem, 9vw, 8rem);
  letter-spacing: -0.1em;
  line-height: 0.78;
}

.repo-identity-name {
  color: var(--color-on-dark);
  font-size: var(--font-lg);
  font-weight: 800;
}

.case-hero-visual {
  overflow: hidden;
  border: 1px solid var(--color-gray-700);
  border-radius: var(--radius-xl);
  background: var(--color-dark-surface-alt);
  box-shadow: var(--shadow-lift);
  transform: rotate(1.5deg);
}

.case-hero-visual img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.summary-grid {
  grid-template-columns: repeat(3, 1fr);
  margin-top: calc(var(--space-16) * -1);
  position: relative;
  z-index: 2;
}

.summary-card {
  padding: var(--space-8);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-md);
}

.summary-card strong {
  display: block;
  margin-bottom: var(--space-4);
  color: var(--color-accent-strong);
  font-family: var(--font-mono);
  font-size: var(--font-xs);
  letter-spacing: .1em;
  text-transform: uppercase;
}

.case-layout {
  display: grid;
  grid-template-columns: minmax(180px, 2fr) minmax(0, 8fr);
  gap: clamp(var(--space-8), 6vw, var(--space-24));
}

.case-toc {
  position: sticky;
  top: 110px;
  align-self: start;
  padding-left: var(--space-5);
  border-left: 1px solid var(--color-border-strong);
}

.case-toc ul {
  display: grid;
  gap: var(--space-3);
  margin: 0;
  padding: 0;
  list-style: none;
}

.case-toc a {
  color: var(--color-muted);
  font-size: var(--font-sm);
  text-decoration: none;
}

.case-story {
  min-width: 0;
}

.case-section {
  padding-block: clamp(var(--space-16), 8vw, var(--space-24));
  border-top: 1px solid var(--color-border-strong);
}

.case-section:first-child {
  border-top: 0;
}

.case-section-header {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: var(--space-6);
  margin-bottom: var(--space-10);
}

.case-section h2 {
  max-width: 840px;
  margin-bottom: 0;
  font-size: clamp(var(--font-3xl), 4vw, var(--font-4xl));
}

.case-copy {
  max-width: var(--reading-max);
  margin-left: 96px;
}

.case-copy p {
  color: var(--color-gray-700);
  font-size: var(--font-lg);
}

.repo-stack-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-8);
}

.repo-stack-grid h3 {
  margin-bottom: var(--space-4);
}

.repo-source {
  padding: var(--space-8);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--repo-accent, var(--color-accent));
  border-radius: var(--radius-md);
  background: var(--color-surface-muted);
}

.repo-source p:last-child {
  margin-bottom: 0;
}

.repo-source-code {
  font-family: var(--font-mono);
  font-size: var(--font-xs) !important;
}

.system-flow {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-3);
  margin-top: var(--space-10);
}

.system-node {
  position: relative;
  min-height: 180px;
  padding: var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.system-node::after {
  position: absolute;
  top: 50%;
  right: calc(var(--space-3) * -1);
  width: var(--space-3);
  border-top: 2px solid var(--color-accent);
  content: "";
}

.system-node:last-child::after {
  display: none;
}

.system-node-number {
  display: block;
  margin-bottom: var(--space-10);
  color: var(--color-accent-strong);
  font-family: var(--font-mono);
  font-size: var(--font-xs);
}

.media-grid {
  grid-template-columns: repeat(2, 1fr);
  margin-top: var(--space-10);
}

.media-figure {
  overflow: hidden;
  margin: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
}

.media-figure:first-child:nth-last-child(odd) {
  grid-column: 1 / -1;
}

.media-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  object-position: top;
}

.media-figure figcaption {
  padding: var(--space-4) var(--space-5);
  color: var(--color-muted);
  font-size: var(--font-sm);
}

.role-grid,
.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.role-panel,
.related-card,
.seo-supplement {
  padding: var(--space-8);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}

.role-panel ul {
  padding-left: var(--space-5);
}

.seo-supplement {
  background: var(--color-surface-muted);
}

.case-faq {
  border-top: 1px solid var(--color-border);
}

.faq-list {
  display: grid;
  gap: var(--space-3);
  max-width: 980px;
}

.faq-item {
  border: 1px solid var(--color-border-strong);
  background: var(--color-surface);
}

.faq-item summary {
  min-height: var(--control-min);
  padding: var(--space-5) var(--space-6);
  cursor: pointer;
  font-size: var(--font-lg);
  font-weight: 800;
}

.faq-item p {
  max-width: 820px;
  margin: 0;
  padding: 0 var(--space-6) var(--space-6);
}

.search-reference {
  border-top: 1px solid var(--color-border);
  background: var(--color-surface-muted);
}

.search-reference-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-5);
}

.search-reference-card {
  padding: var(--space-6);
  border-top: 4px solid var(--color-accent);
  background: var(--color-surface);
}

.search-reference-card h3 {
  margin-top: var(--space-2);
}

.search-reference-card ul {
  padding-left: var(--space-5);
}

.search-reference-card li + li {
  margin-top: var(--space-2);
}

.search-reference-card blockquote {
  margin: 0;
  color: var(--color-foreground);
  font-size: var(--font-lg);
  font-weight: 750;
  line-height: 1.6;
}

.site-footer {
  display: grid;
  grid-template-columns: 2fr 1fr auto;
  gap: var(--space-12);
  padding: var(--space-16) var(--spacing-page);
  border-top: 1px solid var(--color-gray-700);
  background: var(--color-ink-950);
  color: var(--color-on-dark);
}

.footer-statement {
  max-width: 580px;
  color: var(--color-on-dark-muted);
}

.footer-socials {
  display: grid;
  align-content: start;
  gap: var(--space-2);
}

.footer-copyright {
  color: var(--color-on-dark-muted);
  font-size: var(--font-xs);
}

@media (max-width: 1000px) {
  .hero-grid,
  .case-hero-grid {
    grid-template-columns: 1fr;
  }

  .hero-note {
    max-width: 720px;
  }

  .capability-grid,
  .summary-grid {
    grid-template-columns: 1fr;
  }

  .repository-map-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .repo-grid .project-card {
    grid-column: span 6;
  }

  .capability-card {
    min-height: 0;
  }

  .capability-number {
    margin-bottom: var(--space-10);
  }

  .section-heading {
    grid-template-columns: 80px 1fr;
  }

  .section-intro {
    grid-column: 2;
  }

  .method-rail {
    grid-template-columns: repeat(2, 1fr);
  }

  .method-step:nth-child(2) {
    border-right: 0;
  }

  .summary-grid {
    margin-top: var(--space-8);
  }

  .case-layout {
    grid-template-columns: 1fr;
  }

  .repo-identity {
    min-height: 300px;
  }

  .case-toc {
    position: static;
    padding: var(--space-5);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
  }

  .case-toc ul {
    display: flex;
    flex-wrap: wrap;
  }

  .system-flow {
    grid-template-columns: repeat(2, 1fr);
  }

  .system-node::after {
    display: none;
  }

  .search-reference-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  body {
    font-size: 17px;
  }

  .site-header {
    grid-template-columns: 1fr auto;
    gap: var(--space-3);
    padding-inline: var(--space-4);
  }

  .site-nav {
    grid-column: 1 / -1;
    width: 100%;
    overflow-x: auto;
    justify-self: stretch;
    padding-bottom: var(--space-2);
  }

  .site-nav ul {
    width: max-content;
  }

  .header-action {
    padding-inline: var(--space-4);
    font-size: var(--font-sm);
  }

  .hero {
    min-height: auto;
  }

  .hero::after {
    top: 12%;
    right: -46%;
    width: 100vw;
  }

  .proof-strip,
  .timeline-item,
  .media-grid,
  .role-grid,
  .related-grid {
    grid-template-columns: 1fr;
  }

  .proof-item {
    min-height: 0;
    border-right: 0;
    border-bottom: 1px solid var(--color-border-strong);
  }

  .proof-item:last-child {
    border-bottom: 0;
  }

  .section-heading {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }

  .section-intro {
    grid-column: auto;
  }

  .project-card,
  .project-card:nth-child(3n + 1),
  .project-card:nth-child(3n + 2) {
    grid-column: 1 / -1;
  }

  .repository-map-grid {
    grid-template-columns: 1fr;
  }

  .repository-category-card {
    min-height: 280px;
  }

  .repo-grid .project-card {
    grid-column: 1 / -1;
    min-height: 0;
  }

  .repo-search {
    grid-template-columns: 1fr;
  }

  .filter-group {
    grid-template-columns: 1fr;
  }

  .filter-options {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: var(--space-2);
  }

  .filter-chip {
    flex: 0 0 auto;
  }

  .method-rail {
    grid-template-columns: 1fr;
  }

  .method-step,
  .method-step:nth-child(2) {
    min-height: 0;
    border-right: 0;
  }

  .method-step-number {
    margin-bottom: var(--space-8);
  }

  .case-section-header {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }

  .case-copy {
    margin-left: 0;
  }

  .repo-stack-grid {
    grid-template-columns: 1fr;
  }

  .system-flow {
    grid-template-columns: 1fr;
  }

  .site-footer {
    grid-template-columns: 1fr;
    gap: var(--space-8);
    padding-inline: var(--space-5);
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
  }
}