/* =====================
   VARIABLES
   ===================== */
:root {
  --font-sans: 'Geist', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --font-serif: ui-serif, Georgia, Cambria, serif;

  --bg: #0a0a0a;
  --bg-card: #0f0f0f;
  --bg-thumb: #111;

  /* border scale: 100 (darkest) → 500 (lightest) */
  --border-100: #141414;
  --border-200: #1a1a1a;
  --border-300: #1e1e1e;
  --border-400: #2a2a2a;
  --border-500: #333;

  --text-primary: #f0ede6;
  --text-secondary: #555;
  --text-muted: #444;
  --text-subtle: #666;
  --text-meta: #888;
  --text-dim: #2a2a2a;

  --accent: #f97316;
  --accent-hover: #fb923c;
  --accent-bg: rgba(249, 115, 22, 0.06);
  --accent-bg-hover: rgba(249, 115, 22, 0.14);
  --accent-border: rgba(249, 115, 22, 0.3);

  --bg-nav: rgba(10, 10, 10, 0.85);
  --timeline-dot-ring: #3a1a00;
}

[data-theme="light"] {
  --bg: #f0ede6;
  --bg-card: #e8e5de;
  --bg-thumb: #dedad2;

  --border-100: #e4e1da;
  --border-200: #d8d5ce;
  --border-300: #c4c0b8;
  --border-400: #a4a09a;
  --border-500: #888480;

  --text-primary: #0a0a0a;
  --text-secondary: #444;
  --text-muted: #666;
  --text-subtle: #888;
  --text-meta: #999;
  --text-dim: #c4c0b8;

  --accent-hover: #ea6a0a;
  --accent-bg: rgba(249, 115, 22, 0.08);
  --accent-bg-hover: rgba(249, 115, 22, 0.16);
  --accent-border: rgba(249, 115, 22, 0.45);

  --bg-nav: rgba(240, 237, 230, 0.93);
  --timeline-dot-ring: rgba(249, 115, 22, 0.25);
}

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

/* =====================
   BASE
   ===================== */
html {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text-primary);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s ease, color 0.3s ease;
}

body {
  position: relative;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-size: inherit;
  font-weight: inherit;
}

/* =====================
   SCROLLBAR
   ===================== */
::-webkit-scrollbar {
  width: 4px;
}

::-webkit-scrollbar-track {
  background: var(--bg);
}

::-webkit-scrollbar-thumb {
  background: var(--border-400);
  border-radius: 2px;
}

/* =====================
   LAYOUT
   ===================== */
.container {
  max-width: 56rem;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.section {
  max-width: 56rem;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
  padding-bottom: 3rem;
}

section,
.stack-strip,
footer {
  position: relative;
  z-index: 1;
}

.section-header {
  margin-bottom: 2.5rem;
}

.section-header-lg {
  margin-bottom: 3rem;
}

/* =====================
   UTILITIES
   ===================== */
.fade-in {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: none;
}

@keyframes blink {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0;
  }
}

.cursor::after {
  content: '|';
  animation: blink 1s infinite;
  color: var(--accent);
  margin-left: 1px;
}

.badge {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  padding: 2px 8px;
  border-radius: 2px;
}

.badge-gray {
  background: var(--border-100);
  border: 1px solid var(--border-300);
  color: var(--text-muted);
}

.section-label {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  font-weight: 300;
  letter-spacing: 0.01em;
  margin-bottom: 0.25rem;
}

.section-title {
  font-family: var(--font-mono);
  font-size: 1.875rem;
  font-weight: 500;
  letter-spacing: -0.02em;
}

.social-icon {
  color: #888;
  text-decoration: none;
  transition: color 0.2s;
}

.social-icon:hover {
  color: var(--accent);
}

.social-icon i {
  font-size: 2.1875rem;
  line-height: 1;
  display: block;
}

.btn-primary {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  padding: 0.625rem 1.25rem;
  background: var(--accent);
  color: #000;
  border-radius: 2px;
  text-decoration: none;
  font-weight: 500;
  transition: background 0.2s;
}

.btn-primary:hover {
  background: var(--accent-hover);
}

/* =====================
   NAV
   ===================== */
nav {
  font-family: var(--font-mono);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  border-bottom: 1px solid var(--border-100);
  background: var(--bg-nav);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.nav-inner {
  height: 3.5rem;
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-logo {
  font-size: 1.375rem;
  color: var(--text-primary);
  text-decoration: none;
  transition: color 0.2s;
  margin-right: auto;
}

.nav-logo-short {
  display: none;
  letter-spacing: 0.15em;
}

.nav-logo:hover {
  color: var(--accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-link {
  font-size: 1rem;
  color: var(--text-subtle);
  text-decoration: none;
  transition: color 0.2s;
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width 0.25s;
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

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

.nav-end {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* lang toggle */
.nav-lang-toggle {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  border: 1px solid var(--border-400);
  border-radius: 2px;
  background: none;
  cursor: pointer;
  padding: 0;
  overflow: hidden;
  transition: border-color 0.2s;
}

.nav-lang-toggle:hover {
  border-color: var(--border-500);
}

.lang-option {
  padding: 4px 7px;
  color: var(--text-muted);
  transition: color 0.15s, background 0.15s;
  line-height: 1;
}

.lang-option.active {
  background: var(--accent);
  color: #000;
  font-weight: 500;
}

/* theme toggle */
.nav-theme-toggle {
  display: flex;
  align-items: center;
  gap: 7px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-theme-toggle svg {
  width: 25px;
  height: 25px;
  flex-shrink: 0;
  transition: color 0.25s ease;
}

.nav-theme-toggle .icon-moon {
  color: var(--accent);
}

.nav-theme-toggle .icon-sun {
  color: var(--text-muted);
}

[data-theme="light"] .nav-theme-toggle .icon-moon {
  color: var(--text-muted);
}

[data-theme="light"] .nav-theme-toggle .icon-sun {
  color: var(--accent);
}

.toggle-track {
  width: 36px;
  height: 20px;
  background: var(--border-400);
  border-radius: 10px;
  position: relative;
  flex-shrink: 0;
  transition: background 0.25s ease;
}

[data-theme="light"] .toggle-track {
  background: var(--accent);
}

.toggle-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  background: var(--text-primary);
  border-radius: 50%;
  transition: transform 0.25s ease, background 0.3s ease;
}

[data-theme="light"] .toggle-thumb {
  transform: translateX(16px);
}

/* hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-subtle);
  border-radius: 1px;
  transition: transform 0.25s ease, opacity 0.25s ease, background 0.2s;
}

.nav-hamburger:hover span {
  background: var(--text-primary);
}

.nav-hamburger.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-hamburger.open span:nth-child(2) {
  opacity: 0;
}

.nav-hamburger.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* =====================
   HERO
   ===================== */
.hero {
  padding-top: 9rem;
  padding-bottom: 5rem;
}

.hero-glitch-wrapper {
  position: fixed;
  top: 3.5rem;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  z-index: 0;
  mask-image: linear-gradient(to right,
      black 0%,
      rgba(0, 0, 0, 0.6) 2%,
      rgba(0, 0, 0, 0.25) 6%,
      rgba(0, 0, 0, 0.06) 13%,
      transparent calc(50% - 28rem),
      transparent calc(50% + 28rem),
      rgba(0, 0, 0, 0.06) 87%,
      rgba(0, 0, 0, 0.25) 94%,
      rgba(0, 0, 0, 0.6) 98%,
      black 100%);
  -webkit-mask-image: linear-gradient(to right,
      black 0%,
      rgba(0, 0, 0, 0.6) 2%,
      rgba(0, 0, 0, 0.25) 6%,
      rgba(0, 0, 0, 0.06) 13%,
      transparent calc(50% - 28rem),
      transparent calc(50% + 28rem),
      rgba(0, 0, 0, 0.06) 87%,
      rgba(0, 0, 0, 0.25) 94%,
      rgba(0, 0, 0, 0.6) 98%,
      black 100%);
}

.hero-glitch-wrapper canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.hero-status {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.hero-status-line {
  width: 1rem;
  height: 1px;
  background: var(--border-500);
  display: inline-block;
  flex-shrink: 0;
}

.hero-status-dot {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--accent);
  display: inline-block;
  flex-shrink: 0;
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {

  0%,
  100% {
    opacity: 1;
    transform: scale(1.15);
  }

  50% {
    opacity: 0.1;
    transform: scale(0.65);
  }
}

.hero-title {
  font-family: var(--font-serif);
  font-size: 3.75rem;
  line-height: 1.05;
  margin-bottom: 0.5rem;
}

.hero-title em {
  color: var(--accent);
  font-style: italic;
}

.hero-subtitle {
  font-family: var(--font-serif);
  font-size: 3rem;
  line-height: 1.05;
  color: var(--border-500);
  margin-bottom: 2rem;
}

.hero-bio {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 32rem;
  line-height: 1.625;
  margin-bottom: 2.5rem;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero-socials {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* =====================
   STACK STRIP
   ===================== */
.stack-strip {
  padding-top: 1rem;
  padding-bottom: 1rem;
  margin-bottom: 6rem;
  max-width: 56rem;
  margin-left: auto;
  margin-right: auto;
}

.marquee-outer {
  overflow: hidden;
  mask-image: linear-gradient(to right, transparent 0%, black 10%, black 90%, transparent 100%);
  -webkit-mask-image: linear-gradient(to right, transparent 0%, black 10%, black 90%, transparent 100%);
}

.marquee-inner {
  display: flex;
  align-items: center;
  width: max-content;
  animation: marquee-go 38s linear infinite;
}

.marquee-inner:hover {
  animation-play-state: paused;
}

@keyframes marquee-go {
  0% {
    transform: translateX(0);
  }

  100% {
    transform: translateX(-50%);
  }
}

.stack-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 1.75rem;
  opacity: 0.7;
  transition: opacity 0.2s;
  white-space: nowrap;
}

.stack-item:hover {
  opacity: 1;
}

.stack-item i {
  font-size: 2.5rem;
}

.stack-item span {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

/* =====================
   ENTRY (shared)
   ===================== */
.entry-date {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
}

.entry-title {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.entry-org {
  font-size: 1rem;
  color: var(--accent);
}

.entry-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.625;
}

/* =====================
   PROJECTS
   ===================== */
.projects-grid {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: 1fr;
}

.project-card {
  border: 1px solid var(--border-200);
  border-radius: 2px;
  background: var(--bg);
  transition: border-color 0.2s, background 0.2s;
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  border-color: var(--border-400);
  background: var(--bg-card);
}

.project-thumb {
  width: 100%;
  aspect-ratio: 16/9;
  background: var(--bg-thumb);
  border-bottom: 1px solid var(--border-200);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.project-thumb img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.project-thumb img.loaded {
  opacity: 1;
}

.project-thumb .placeholder {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--border-400);
  letter-spacing: 0.1em;
  user-select: none;
}

.project-body {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  flex: 1;
}

.project-body .entry-desc {
  flex: 1;
}

.project-links {
  display: flex;
  gap: 0.5rem;
}

.project-link {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  padding: 6px 10px;
  border-radius: 2px;
  border: 1px solid var(--border-400);
  color: var(--text-secondary);
  background: transparent;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  text-decoration: none;
  flex: 1;
}

.project-link:hover {
  border-color: var(--accent);
  color: #000;
  background: var(--accent);
}

/* thumb overlay */
.thumb-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.35);
  opacity: 0;
  transition: opacity 0.2s ease;
  cursor: pointer;
}

.project-thumb:hover .thumb-overlay {
  opacity: 1;
}

.thumb-overlay-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.65);
  border: 1.5px solid rgba(255, 255, 255, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  transition: transform 0.2s ease, background 0.2s;
}

.project-thumb:hover .thumb-overlay-btn {
  transform: scale(1.08);
}

/* lightbox */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.lightbox.open {
  opacity: 1;
  pointer-events: auto;
}

.lightbox-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.88);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.lightbox-inner {
  position: relative;
  max-width: min(90vw, 64rem);
  width: 100%;
  z-index: 1;
}

.lightbox-close {
  position: absolute;
  top: -2.25rem;
  right: 0;
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 4px;
  line-height: 1;
  display: flex;
  align-items: center;
  transition: color 0.2s;
}

.lightbox-close:hover {
  color: #f0ede6;
}

.lightbox-title {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: #f0ede6;
  margin-bottom: 0.75rem;
  letter-spacing: 0.02em;
}

.lightbox-img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 2px;
}

/* =====================
   EXPERIENCE
   ===================== */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 3px;
  top: 8px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom,
      var(--accent) 0%,
      rgba(249, 115, 22, 0.55) 30%,
      rgba(249, 115, 22, 0.25) 60%,
      rgba(249, 115, 22, 0.06) 85%,
      transparent 100%);
}

.timeline-item {
  position: relative;
  padding-bottom: 2.75rem;
  opacity: 0;
  transform: translateX(-10px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.timeline-item.visible {
  opacity: 1;
  transform: translateX(0);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -1.75rem;
  top: 6px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px var(--bg), 0 0 0 4px var(--timeline-dot-ring);
  transform: translateX(-50%);
}

.timeline-item:not(:first-child)::before {
  background: var(--border-300);
  box-shadow: 0 0 0 3px var(--bg), 0 0 0 4px var(--border-200);
}

.timeline .entry-date {
  margin-bottom: 0.25rem;
}

.timeline .entry-org {
  margin-bottom: 0.2rem;
}

.timeline .entry-desc {
  max-width: 32rem;
}

.timeline-location {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-subtle);
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

/* =====================
   EDUCATION
   ===================== */
.education-card {
  border: 1px solid var(--border-200);
  border-radius: 2px;
  padding: 1.5rem;
  max-width: 36rem;
  background: var(--bg);
  transition: border-color 0.2s;
}

.education-card:hover {
  border-color: var(--border-400);
}

.education-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.75rem;
}

/* =====================
   FOOTER
   ===================== */
footer {
  font-family: var(--font-mono);
  border-top: 1px solid var(--border-100);
  max-width: 56rem;
  margin-left: auto;
  margin-right: auto;
  padding: 2rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-copy {
  font-size: 0.8rem;
}

.footer-made {
  font-size: 0.75rem;
  color: var(--text-subtle);
  margin-top: 0.25rem;
}

.footer-icons {
  display: flex;
  gap: 1.25rem;
  align-items: center;
}

/* =====================
   RESPONSIVE
   ===================== */
@media (max-width: 1023px) {
  .hero-glitch-wrapper {
    position: absolute;
    bottom: auto;
    height: 60px;
    mask-image: linear-gradient(to bottom, black 0%, transparent 100%);
    -webkit-mask-image: linear-gradient(to bottom, black 0%, transparent 100%);
  }

  .nav-hamburger {
    display: flex;
  }

  .nav-logo-full {
    display: none;
  }

  .nav-logo-short {
    display: inline;
  }

  .nav-links {
    position: fixed;
    top: 3.5rem;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border-100);
    padding: 0.25rem 1.5rem 1rem;
    opacity: 0;
    transform: translateY(-6px);
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
  }

  .nav-links.open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-link {
    font-size: 0.875rem;
    padding: 0.875rem 0;
    border-bottom: 1px solid var(--border-100);
  }

  .nav-link:last-child {
    border-bottom: none;
  }
}

@media (max-width: 767px) {
  .section {
    padding-bottom: 2rem;
  }

  .stack-strip {
    margin-bottom: 1rem;
  }

  .hero-socials,
  .footer-icons {
    margin-left: auto;
  }
}

@media (min-width: 768px) {
  .hero-title {
    font-size: 4.5rem;
  }

  .hero-subtitle {
    font-size: 3.75rem;
  }

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

@media (min-width: 1024px) {
  .projects-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}