/* ============================================================
   Design Tokens
   ============================================================ */
:root {
  --color-bg: #0A0A0A;
  --color-text: #EFEFEF;
  --color-text-subtle: #555;
  --color-border: #222;

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

  --max-width: 860px;
  --nav-height: 56px;

  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;

  --text-xs:   0.70rem;
  --text-sm:   0.80rem;
  --text-base: 0.9375rem;
  --text-lg:   1.0625rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  2rem;
  --text-4xl:  2.5rem;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-mono);
  font-weight: 400;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
}

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

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

ul, ol {
  list-style: none;
}

/* ============================================================
   Base
   ============================================================ */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

h1 {
  font-size: var(--text-4xl);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

h2 {
  font-size: var(--text-xl);
  font-weight: 400;
  line-height: 1.3;
}

p {
  color: var(--color-text-subtle);
  line-height: 1.7;
}

/* ============================================================
   Layout
   ============================================================ */
main {
  min-height: calc(100vh - var(--nav-height) - 72px);
}

footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-4) 0;
}

footer p {
  font-size: var(--text-xs);
  color: var(--color-text-subtle);
}

.section {
  padding-top: var(--space-10);
  padding-bottom: var(--space-10);
}

.section + .section {
  border-top: 1px solid var(--color-border);
}

/* CLI comment-style section label */
.section-comment {
  font-size: var(--text-xs);
  color: var(--color-text-subtle);
  margin-bottom: var(--space-4);
  letter-spacing: 0.04em;
}

/* ============================================================
   Nav
   ============================================================ */
nav {
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-bg);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.nav-logo {
  font-size: var(--text-sm);
  font-weight: 400;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-logo .prompt-text {
  color: var(--color-text-subtle);
}

.nav-logo .cursor {
  display: inline-block;
  animation: cursor-blink 1.2s step-end infinite;
}

@keyframes cursor-blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

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

.nav-link {
  font-size: var(--text-xs);
  color: var(--color-text-subtle);
  letter-spacing: 0.04em;
  transition: color 0.15s;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-text);
}

/* ============================================================
   Hero (index)
   ============================================================ */
.hero {
  padding-top: var(--space-12);
  padding-bottom: var(--space-8);
}

.hero h1 {
  margin-bottom: var(--space-2);
  color: var(--color-text);
}

.subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-subtle);
  margin-bottom: var(--space-5);
}

.hero-meta {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.hero-meta-row {
  display: flex;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-subtle);
}

.hero-meta-row .year {
  min-width: 72px;
  flex-shrink: 0;
}

.hero-meta-row .org {
  color: var(--color-text);
}

/* ============================================================
   Cards (index featured)
   ============================================================ */
.cards-section {
  padding-top: var(--space-10);
  padding-bottom: var(--space-10);
  border-top: 1px solid var(--color-border);
}

.cards-scroll {
  display: flex;
  gap: var(--space-3);
  overflow-x: auto;
  padding-bottom: var(--space-3);
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.cards-scroll::-webkit-scrollbar {
  height: 2px;
}

.cards-scroll::-webkit-scrollbar-track {
  background: var(--color-border);
}

.cards-scroll::-webkit-scrollbar-thumb {
  background: #444;
}

.card {
  display: flex;
  flex-direction: column;
  width: 240px;
  flex-shrink: 0;
  border: 1px solid var(--color-border);
  padding: var(--space-3);
  scroll-snap-align: start;
  transition: border-color 0.15s;
  cursor: pointer;
}

.card:hover {
  border-color: #444;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--space-3);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-border);
}

.card-type {
  font-size: var(--text-xs);
  color: var(--color-text-subtle);
  letter-spacing: 0.08em;
}

.card-type::before {
  content: '[ ';
}

.card-type::after {
  content: ' ]';
}

.card-year {
  font-size: var(--text-xs);
  color: var(--color-text-subtle);
}

.card-body {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  flex: 1;
}

.card-title {
  font-size: var(--text-base);
  font-weight: 400;
  color: var(--color-text);
  line-height: 1.4;
}

.card-subtitle {
  font-size: var(--text-sm);
  color: var(--color-text-subtle);
  line-height: 1.4;
}

.card-note {
  font-size: var(--text-xs);
  color: var(--color-text-subtle);
  margin-top: auto;
  padding-top: var(--space-2);
  line-height: 1.5;
}

.scroll-hint {
  font-size: var(--text-xs);
  color: var(--color-text-subtle);
  margin-top: var(--space-2);
  letter-spacing: 0.04em;
}

/* ============================================================
   About page
   ============================================================ */
.about-section {
  padding-top: var(--space-10);
  padding-bottom: var(--space-10);
}

.about-section + .about-section {
  border-top: 1px solid var(--color-border);
}

.section-label {
  font-size: var(--text-xs);
  color: var(--color-text-subtle);
  letter-spacing: 0.04em;
  margin-bottom: var(--space-4);
}

.content-block {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.institution {
  font-size: var(--text-base);
  color: var(--color-text);
}

.detail {
  font-size: var(--text-sm);
  color: var(--color-text-subtle);
  line-height: 1.6;
}

.timeline {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.timeline-item {
  display: flex;
  gap: var(--space-4);
  align-items: baseline;
}

.timeline-year {
  font-size: var(--text-sm);
  color: var(--color-text-subtle);
  min-width: 88px;
  flex-shrink: 0;
}

.timeline-company {
  font-size: var(--text-base);
  color: var(--color-text);
}

/* ============================================================
   Projects page
   ============================================================ */
.projects-hero {
  padding-top: var(--space-12);
  padding-bottom: var(--space-8);
}

.projects-hero h1 {
  margin-bottom: var(--space-2);
}

.projects-hero .subtitle {
  font-size: var(--text-sm);
  margin-bottom: 0;
}

.project-list {
  display: flex;
  flex-direction: column;
}

.project-row {
  display: grid;
  grid-template-columns: 40px 1fr auto;
  gap: var(--space-3);
  align-items: baseline;
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-border);
}

.project-row:first-child {
  border-top: 1px solid var(--color-border);
}

.project-year {
  font-size: var(--text-xs);
  color: var(--color-text-subtle);
}

.project-name {
  font-size: var(--text-sm);
  color: var(--color-text);
  line-height: 1.5;
}

.project-role {
  font-size: var(--text-xs);
  color: var(--color-text-subtle);
  text-align: right;
  white-space: nowrap;
}

/* ============================================================
   Works page
   ============================================================ */
.works-hero {
  padding-top: var(--space-12);
  padding-bottom: var(--space-8);
}

.works-hero h1 {
  margin-bottom: var(--space-2);
}

.work-item {
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.work-title {
  font-size: var(--text-xl);
  font-weight: 400;
  color: var(--color-text);
  line-height: 1.3;
}

.work-award {
  font-size: var(--text-xs);
  color: var(--color-text-subtle);
}

.work-videos {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.video-label {
  font-size: var(--text-xs);
  color: var(--color-text-subtle);
  margin-bottom: var(--space-1);
  letter-spacing: 0.04em;
}

.video-wrapper {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  background-color: #111;
}

.video-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.image-placeholder {
  border: 1px dashed var(--color-border);
  padding: var(--space-6) var(--space-4);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 120px;
}

.image-placeholder p {
  font-size: var(--text-xs);
  color: var(--color-text-subtle);
}

/* ============================================================
   Contact page
   ============================================================ */
.contact-hero {
  padding-top: var(--space-12);
  padding-bottom: var(--space-8);
}

.contact-hero h1 {
  margin-bottom: var(--space-2);
}

.contact-list {
  display: flex;
  flex-direction: column;
}

.contact-item {
  display: flex;
  gap: var(--space-4);
  align-items: baseline;
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-border);
  font-size: var(--text-sm);
}

.contact-item:first-child {
  border-top: 1px solid var(--color-border);
}

.contact-label {
  color: var(--color-text-subtle);
  min-width: 96px;
  flex-shrink: 0;
}

.contact-label::before {
  content: '> ';
}

.contact-value {
  color: var(--color-text);
}

.contact-value.placeholder {
  color: var(--color-text-subtle);
}

.contact-value a {
  text-decoration: underline;
  text-decoration-color: var(--color-border);
  text-underline-offset: 3px;
  transition: text-decoration-color 0.15s;
}

.contact-value a:hover {
  text-decoration-color: var(--color-text);
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 640px) {
  h1 { font-size: var(--text-3xl); }
  .container { padding: 0 var(--space-3); }

  .timeline-item {
    flex-direction: column;
    gap: 4px;
  }

  .project-row {
    grid-template-columns: 36px 1fr;
    grid-template-rows: auto auto;
  }

  .project-role {
    grid-column: 2;
    text-align: left;
  }
}