/* css/style.css — Neo-Brutalist Design System */

/* === Custom Properties === */
:root {
  --bg: #FFFFFF;
  --black: #000000;
  --blue: #0000FF;
  --border-width: 4px;
  --border-width-thick: 8px;
  --shadow-offset: 6px;
  --shadow-offset-lg: 10px;
  --font-ko: 'MiSans', 'Noto Sans KR', 'Apple SD Gothic Neo', 'Malgun Gothic', sans-serif;
  --font-en: 'Arial', 'Helvetica', sans-serif;
  --mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
}

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

/* === Base === */
html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-ko);
  background: var(--bg);
  color: var(--black);
  line-height: 1.7;
  min-height: 100vh;
}

.en {
  font-family: var(--font-en);
}

code {
  font-family: var(--mono);
  font-size: 0.9em;
}

pre {
  font-family: var(--mono);
  background: var(--bg);
  border: var(--border-width) solid var(--black);
  box-shadow: var(--shadow-offset) var(--shadow-offset) 0 var(--black);
  padding: 1rem;
  overflow-x: auto;
  margin: 1rem 0;
  line-height: 1.4;
}

pre code {
  background: none;
  padding: 0;
  border: none;
  box-shadow: none;
}

/* === Layout === */
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* === Navigation Bar === */
.nav {
  border-bottom: var(--border-width-thick) solid var(--black);
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-brand {
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--black);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.nav-brand:hover {
  color: var(--blue);
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--black);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0.25rem 0.5rem;
  border: 2px solid transparent;
  transition: all 0.1s;
}

.nav-links a:hover {
  border-color: var(--black);
  box-shadow: 2px 2px 0 var(--black);
}

.nav-links a.active {
  background: var(--black);
  color: var(--bg);
}

.lang-switcher {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  margin-left: 0.5rem;
  border-left: 2px solid #eee;
  padding-left: 1rem;
}

.lang-switcher .divider {
  color: var(--black);
  opacity: 0.3;
  font-size: 0.8rem;
}

.lang-switcher a {
  font-size: 0.75rem;
  padding: 0.15rem 0.35rem;
}

/* === Typography === */
h1 {
  font-size: 2.5rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 1.5rem;
}

h2 {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-top: 2rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: var(--border-width) solid var(--black);
}

h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

/* === Sections === */
section {
  margin: 2rem 0;
}

/* === Cards === */
.card {
  border: var(--border-width) solid var(--black);
  box-shadow: var(--shadow-offset) var(--shadow-offset) 0 var(--black);
  padding: 1.5rem;
  margin: 1rem 0;
  transition: transform 0.1s, box-shadow 0.1s;
}

.card:hover {
  transform: translate(2px, 2px);
  box-shadow: calc(var(--shadow-offset) - 2px) calc(var(--shadow-offset) - 2px) 0 var(--black);
}

.card-link {
  text-decoration: none;
  color: inherit;
  display: block;
}

.card-link:hover .card-title {
  color: var(--blue);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.card-tag {
  display: inline-block;
  background: var(--black);
  color: var(--bg);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  margin-right: 0.35rem;
  margin-bottom: 0.35rem;
}

.card-tag.blue {
  background: var(--blue);
}

/* === Buttons === */
.btn {
  display: inline-block;
  padding: 0.6rem 1.25rem;
  border: var(--border-width) solid var(--black);
  box-shadow: 4px 4px 0 var(--black);
  background: var(--bg);
  color: var(--black);
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.1s;
  font-family: var(--font-ko);
  margin-right: 0.5rem;
  margin-bottom: 0.5rem;
}

.btn:hover {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--black);
}

.btn:active {
  transform: translate(4px, 4px);
  box-shadow: none;
}

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

.btn-blue {
  background: var(--blue);
  color: var(--bg);
  border-color: var(--blue);
  box-shadow: 4px 4px 0 var(--black);
}

/* === Workflow Diagram === */
.workflow {
  background: var(--bg);
  border: var(--border-width-thick) solid var(--black);
  box-shadow: var(--shadow-offset-lg) var(--shadow-offset-lg) 0 var(--black);
  padding: 2rem;
  margin: 2rem 0;
  font-family: var(--mono);
  font-size: 0.9rem;
  line-height: 1.6;
  white-space: pre;
  overflow-x: auto;
  color: var(--black);
}

/* === Lists === */
ul, ol {
  padding-left: 1.5rem;
  margin: 0.75rem 0;
}

li {
  margin: 0.35rem 0;
}

/* === Table === */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
}

th, td {
  border: var(--border-width) solid var(--black);
  padding: 0.75rem;
  text-align: left;
}

th {
  background: var(--black);
  color: var(--bg);
  font-weight: 700;
}

/* === Callout / Badge === */
.callout {
  border: var(--border-width) solid var(--black);
  box-shadow: var(--shadow-offset) var(--shadow-offset) 0 var(--black);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
}

.callout::before {
  content: '▸ ';
  font-weight: 900;
  color: var(--blue);
}

.callout.blue {
  border-color: var(--blue);
  box-shadow: var(--shadow-offset) var(--shadow-offset) 0 var(--blue);
}

.callout.blue::before {
  color: var(--black);
}

/* === Trigger badge (inline code-like) === */
.trigger {
  display: inline-block;
  background: var(--black);
  color: var(--bg);
  font-family: var(--mono);
  font-size: 0.8rem;
  padding: 0.2rem 0.6rem;
  margin: 0.25rem 0;
}

/* === ASCII Arrow / diagram helpers === */
.ascii-arrow {
  color: var(--blue);
  font-weight: 900;
}

/* === Footer === */
.footer {
  border-top: var(--border-width) solid var(--black);
  padding: 1.5rem;
  margin-top: 3rem;
  text-align: center;
  font-size: 0.85rem;
}

.footer a {
  color: var(--blue);
  font-weight: 700;
}

/* === Skill detail page header === */
.skill-header {
  padding: 4rem 1.5rem;
  border-bottom: var(--border-width-thick) solid var(--black);
  background: var(--bg);
}

.skill-header h1 {
  font-size: 3.5rem;
  margin-bottom: 1rem;
  line-height: 1.2;
}

.skill-header p {
  font-size: 1.25rem;
  max-width: 800px;
}

.skill-badge {
  display: inline-block;
  background: var(--black);
  color: var(--bg);
  font-size: 0.8rem;
  font-weight: 700;
  padding: 0.25rem 0.75rem;
  margin-right: 0.5rem;
}

.skill-badge.blue {
  background: var(--blue);
}

/* === Flow diagram for skill pages === */
.flow-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin: 1.5rem 0;
}

.flow-step {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem;
  border: var(--border-width) solid var(--black);
  margin-bottom: -4px;
}

.flow-step:last-child {
  margin-bottom: 0;
}

.flow-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  background: var(--black);
  color: var(--bg);
  font-weight: 900;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.flow-step:first-child .flow-number {
  background: var(--blue);
}

/* === Skill Meta Card (info panel) === */
.meta-card {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1rem;
  margin: 2rem 0;
}

.meta-item {
  border: var(--border-width) solid var(--black);
  box-shadow: var(--shadow-offset) var(--shadow-offset) 0 var(--black);
  padding: 1rem;
}

.meta-label {
  font-size: 0.75rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--black);
  margin-bottom: 0.5rem;
}

.meta-value {
  font-size: 0.95rem;
  line-height: 1.5;
}

.meta-value code {
  display: inline-block;
  background: var(--black);
  color: var(--bg);
  font-size: 0.8rem;
  padding: 0.15rem 0.5rem;
  margin: 0.15rem;
}

.meta-links a {
  display: inline-block;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--blue);
  margin-right: 0.75rem;
}

/* === Skill Chain Diagram === */
.skill-chain {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0;
  margin: 1.5rem 0;
  padding: 1.5rem;
  border: var(--border-width-thick) solid var(--black);
  box-shadow: var(--shadow-offset-lg) var(--shadow-offset-lg) 0 var(--black);
  background: var(--bg);
}

.chain-node {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1rem;
  border: var(--border-width) solid var(--black);
  font-weight: 800;
  font-size: 0.8rem;
  white-space: nowrap;
  background: var(--bg);
}

.chain-node.active {
  background: var(--black);
  color: var(--bg);
}

.chain-node.blue {
  background: var(--blue);
  color: var(--bg);
  border-color: var(--blue);
}

.chain-arrow {
  color: var(--black);
  font-weight: 900;
  font-size: 1.2rem;
  margin: 0 0.5rem;
}

/* === Rule List === */
.rule-list {
  list-style: none;
  padding: 0;
  margin: 1rem 0;
}

.rule-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem;
  border: var(--border-width) solid var(--black);
  margin-bottom: -4px;
  background: var(--bg);
  transition: background 0.1s;
}

.rule-item:last-child {
  margin-bottom: 0;
}

.rule-item:hover {
  background: #f0f0f0;
}

.rule-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  background: var(--black);
  color: var(--bg);
  font-weight: 900;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.rule-content strong {
  display: block;
  margin-bottom: 0.25rem;
  font-size: 1rem;
}

.rule-content p {
  margin: 0;
  font-size: 0.95rem;
  color: #333;
}

/* === Stat Grid === */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 0;
  margin: 1.5rem 0;
}

.stat-item {
  border: var(--border-width) solid var(--black);
  padding: 1.25rem;
  text-align: center;
  margin-right: -4px;
  background: var(--bg);
}

.stat-item:nth-child(odd) {
  background: var(--black);
  color: var(--bg);
}

.stat-number {
  font-size: 2rem;
  font-weight: 900;
  line-height: 1;
  display: block;
}

.stat-label {
  font-size: 0.8rem;
  font-weight: 700;
  margin-top: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.9;
}

/* === Gate Box === */
.gate-box {
  border: var(--border-width-thick) solid var(--black);
  box-shadow: var(--shadow-offset-lg) var(--shadow-offset-lg) 0 var(--black);
  padding: 1.5rem;
  margin: 1.5rem 0;
  position: relative;
}

.gate-box::before {
  content: '⛔ HARD GATE';
  position: absolute;
  top: -0.75rem;
  left: 1rem;
  background: var(--black);
  color: var(--bg);
  font-size: 0.75rem;
  font-weight: 900;
  padding: 0.15rem 0.5rem;
  letter-spacing: 0.05em;
}

/* === Responsive (minimal) === */
@media (max-width: 768px) {
  .container { padding: 1rem; }
  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.35rem; }
  .nav { flex-direction: column; gap: 0.75rem; }
  .nav-links { gap: 0.75rem; }
  .workflow { font-size: 0.7rem; padding: 1rem; }
  .card:hover { transform: none; box-shadow: var(--shadow-offset) var(--shadow-offset) 0 var(--black); }
  .meta-card { grid-template-columns: 1fr; }
  .skill-chain { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
  .chain-arrow { transform: rotate(90deg); margin: 0; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
}