/* ---------- Tokens ---------- */
:root {
  --bg: #0a0a0f;
  --bg-elev: #11111a;
  --bg-card: #131320;
  --bg-card-hover: #181828;
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.18);
  --text: #ececf3;
  --text-dim: #9a9aae;
  --text-mute: #6a6a80;
  --accent: #c7ff4f;
  --accent-soft: rgba(199, 255, 79, 0.12);
  --accent-glow: rgba(199, 255, 79, 0.35);

  --c-lime: #c7ff4f;
  --c-cyan: #7fe7ff;
  --c-amber: #ffc36b;
  --c-violet: #b69bff;
  --c-rose: #ff9bb4;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;

  --container: 1120px;
  --radius: 14px;
  --radius-sm: 8px;
  --ease: cubic-bezier(0.2, 0.6, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;

  background-image:
    radial-gradient(1200px 600px at 80% -100px, rgba(199, 255, 79, 0.06), transparent 60%),
    radial-gradient(800px 500px at 0% 30%, rgba(127, 231, 255, 0.04), transparent 60%);
  background-attachment: fixed;
}

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

ul,
ol {
  list-style: none;
  padding: 0;
  margin: 0;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-weight: 600;
  letter-spacing: -0.02em;
}

p {
  margin: 0;
}

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

::selection {
  background: var(--accent);
  color: var(--bg);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: var(--bg);
  padding: 8px 12px;
  font-weight: 600;
  z-index: 100;
}
.skip-link:focus {
  left: 16px;
  top: 16px;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 10, 15, 0.7);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
}

.logo-mark {
  display: inline-block;
  padding: 4px 8px;
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  letter-spacing: 0.05em;
}

.logo-status {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0 var(--accent-glow);
  animation: pulse 2.4s var(--ease) infinite;
}

@keyframes pulse {
  0%,
  100% {
    box-shadow: 0 0 0 0 var(--accent-glow);
  }
  50% {
    box-shadow: 0 0 0 8px transparent;
  }
}

.site-nav {
  display: flex;
  gap: 28px;
  font-size: 14px;
  color: var(--text-dim);
}

.site-nav a {
  position: relative;
  padding: 4px 0;
  transition: color 0.2s var(--ease);
}

.site-nav a::after {
  content: '';
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -2px;
  height: 1px;
  background: var(--accent);
  transition: right 0.25s var(--ease);
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--text);
}
.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  right: 0;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  border: 1px solid var(--border-strong);
  color: var(--text-dim);
  padding: 6px 12px;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.lang-toggle:hover {
  border-color: var(--accent);
  color: var(--text);
}

.lang-opt {
  transition: color 0.2s var(--ease);
}

.lang-opt.active {
  color: var(--accent);
  font-weight: 600;
}

.lang-sep {
  opacity: 0.5;
}

/* ---------- Hero ---------- */
.hero {
  padding: 100px 0 80px;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 32px;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
}

.hero-eyebrow .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
}

.hero-title {
  font-size: clamp(56px, 9vw, 120px);
  line-height: 0.95;
  letter-spacing: -0.04em;
  font-weight: 700;
  margin-bottom: 24px;
}

.hero-line {
  display: block;
}

.hero-line.accent {
  color: var(--accent);
  font-style: italic;
  font-weight: 600;
}

.hero-role {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text-dim);
  letter-spacing: 0.05em;
  margin-bottom: 24px;
}

.hero-tagline {
  max-width: 640px;
  font-size: clamp(17px, 1.6vw, 20px);
  color: var(--text);
  line-height: 1.55;
  margin-bottom: 40px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-bottom: 40px;
  font-family: var(--font-mono);
  font-size: 13px;
}

.meta-item {
  display: inline-flex;
  flex-direction: column;
  gap: 2px;
}

.meta-label {
  color: var(--text-mute);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 11px;
}

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

.meta-divider {
  width: 1px;
  height: 24px;
  background: var(--border);
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 500;
  font-size: 14px;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease),
    border-color 0.2s var(--ease), color 0.2s var(--ease);
  border: 1px solid transparent;
  cursor: pointer;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 24px -10px var(--accent-glow);
}

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

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 1px solid currentColor;
  font-size: 11px;
  line-height: 1;
  font-family: var(--font-mono);
  transition: transform 0.2s var(--ease);
}

.btn-ghost:hover .btn-icon {
  transform: translateY(2px);
}

.inline-link {
  color: var(--accent);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s var(--ease);
}

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

/* ---------- Section header ---------- */
section {
  padding: 80px 0;
  border-top: 1px solid var(--border);
}

.section-header {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 48px;
  max-width: 720px;
}

.section-num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 0.1em;
}

.section-title {
  font-size: clamp(32px, 4vw, 48px);
  letter-spacing: -0.03em;
}

.section-sub {
  color: var(--text-dim);
  font-size: 16px;
  max-width: 560px;
}

.section-sub strong {
  color: var(--text);
  font-weight: 600;
}

/* ---------- About / Stack ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 64px;
  align-items: start;
}

.about-copy p + p {
  margin-top: 20px;
}

.about-copy {
  font-size: 17px;
  color: var(--text);
  line-height: 1.7;
}

.about-copy strong {
  color: var(--accent);
  font-weight: 600;
}

.about-stack {
  padding: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.stack-heading {
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-mute);
  margin-bottom: 4px;
}

.stack-cat {
  font-size: 13px;
  color: var(--accent);
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
  margin-bottom: 8px;
  font-weight: 500;
}

.stack-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 14px;
  color: var(--text);
}

.stack-list li {
  padding-left: 14px;
  position: relative;
}

.stack-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 4px;
  height: 4px;
  background: var(--text-mute);
  border-radius: 50%;
}

/* ---------- Project grid ---------- */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease),
    transform 0.25s var(--ease);
  position: relative;
}

.project-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--card-color, var(--accent)) 0%, transparent 35%);
  opacity: 0;
  transition: opacity 0.25s var(--ease);
  pointer-events: none;
}

.project-card[data-color='lime'] {
  --card-color: var(--c-lime);
}
.project-card[data-color='cyan'] {
  --card-color: var(--c-cyan);
}
.project-card[data-color='amber'] {
  --card-color: var(--c-amber);
}
.project-card[data-color='violet'] {
  --card-color: var(--c-violet);
}
.project-card[data-color='rose'] {
  --card-color: var(--c-rose);
}

.project-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
  background: var(--bg-card-hover);
}

.project-card:hover::before {
  opacity: 0.07;
}

.project-link {
  display: flex;
  flex-direction: column;
  height: 100%;
  position: relative;
  z-index: 1;
}

.project-visual {
  height: 140px;
  background:
    radial-gradient(circle at 30% 30%, color-mix(in oklab, var(--card-color) 40%, transparent), transparent 60%),
    linear-gradient(135deg, color-mix(in oklab, var(--card-color) 12%, var(--bg-elev)) 0%, var(--bg-elev) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.project-visual::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 24px 24px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
}

.visual-mark {
  font-family: var(--font-mono);
  font-size: 36px;
  font-weight: 600;
  color: var(--card-color);
  letter-spacing: -0.02em;
  z-index: 1;
  text-shadow: 0 0 32px color-mix(in oklab, var(--card-color) 40%, transparent);
}

.project-body {
  padding: 22px 24px 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
}

.project-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.project-name {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.project-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-mute);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.project-desc {
  color: var(--text-dim);
  font-size: 14.5px;
  line-height: 1.6;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
  list-style: none;
  padding: 0;
}

.project-tech li,
.project-tech span {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-dim);
  white-space: nowrap;
}

.project-cta {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--card-color, var(--accent));
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap 0.2s var(--ease);
}

.project-card:hover .project-cta {
  gap: 10px;
}

/* ---------- Experience timeline ---------- */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 32px;
  position: relative;
  padding-left: 28px;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 7px;
  width: 1px;
  background: linear-gradient(180deg, var(--border-strong), transparent);
}

.timeline-item {
  position: relative;
}

.timeline-marker {
  position: absolute;
  left: -28px;
  top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
  box-shadow: 0 0 0 4px var(--bg), 0 0 16px var(--accent-glow);
}

.timeline-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 4px;
}

.timeline-role {
  font-size: 22px;
  font-weight: 600;
}

.timeline-date {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-mute);
}

.timeline-company {
  color: var(--accent);
  font-size: 15px;
  font-weight: 500;
  margin-bottom: 14px;
}

.timeline-meta {
  color: var(--text-mute);
  font-weight: 400;
}

.timeline-desc {
  color: var(--text-dim);
  margin-bottom: 14px;
  max-width: 700px;
}

.timeline-points {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.timeline-points li {
  position: relative;
  padding-left: 20px;
  color: var(--text-dim);
  font-size: 14.5px;
  line-height: 1.6;
}

.timeline-points li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-family: var(--font-mono);
}

/* ---------- Education ---------- */
.edu-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 20px;
  align-items: start;
}

.edu-card {
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
}

.lang-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 16px;
}

.lang-list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.lang-list li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.lang-name {
  color: var(--text);
  font-weight: 500;
}

.lang-level {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
}

@media (max-width: 880px) {
  .edu-grid {
    grid-template-columns: 1fr;
  }
}

.edu-line {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 6px;
}

.edu-degree {
  font-size: 20px;
  font-weight: 600;
}

.edu-date {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-mute);
}

.edu-school {
  color: var(--accent);
  font-size: 15px;
  margin-bottom: 12px;
}

.edu-note {
  color: var(--text-dim);
  font-size: 14.5px;
}

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.contact-link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease),
    transform 0.2s var(--ease);
}

.contact-link:hover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.contact-label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-mute);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.contact-value {
  font-size: 16px;
  color: var(--text);
  word-break: break-all;
}

/* ---------- Footer ---------- */
.site-footer {
  padding: 32px 0;
  border-top: 1px solid var(--border);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  color: var(--text-mute);
  font-family: var(--font-mono);
  font-size: 12px;
}

.footer-left {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.footer-updated {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  color: var(--text-mute);
}

.footer-updated time {
  color: var(--accent);
}


/* ---------- Responsive ---------- */
@media (max-width: 880px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .site-nav {
    display: none;
  }

  .hero {
    padding: 64px 0 48px;
  }

  section {
    padding: 64px 0;
  }

  .timeline {
    padding-left: 24px;
  }

  .timeline-marker {
    left: -24px;
  }
}

@media (max-width: 520px) {
  .hero-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .meta-divider {
    display: none;
  }

  .header-inner {
    height: 56px;
  }

  .project-body {
    padding: 18px 20px 20px;
  }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}