/* Design tokens follow the HyperFrames design system (DESIGN.md in heygen-com/hyperframes):
   warm neutrals, near-black primary, borders over shadows, Inter + IBM Plex Mono. */

/* ---------- Theme ---------- */
:root {
  --bg: #f6f5f1;
  --surface: #ffffff;
  --surface2: #eeedea;
  --border: #e0dfdb;
  --border-light: #d0cfcb;
  --text: #1a1a1a;
  --text-secondary: #6b6b6b;
  --text-tertiary: #999999;
  --heading: #0a0a0a;
  --on-heading: #ffffff;
  --accent: #1d4ed8;
  --accent-light: rgba(29, 78, 216, 0.06);
  --accent-border: rgba(29, 78, 216, 0.22);
  --green: #1a7a0a;
  --spot: rgba(29, 78, 216, 0.07);
  --selection: rgba(29, 78, 216, 0.15);
  /* Hero background glow colours (read by background.js) */
  --glow-1: #93c5fd;
  --glow-2: #bfdbfe;
  --glow-3: #a5b4fc;
  --glow-strength: 0.55;

  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "SF Mono", "Fira Code", monospace;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1); /* expo.out */
  --max-width: 1120px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0a0a0a;
    --surface: #141414;
    --surface2: #1a1a1a;
    --border: #2a2a2a;
    --border-light: #3a3a3a;
    --text: #e5e5e5;
    --text-secondary: #a0a0a0;
    --text-tertiary: #666666;
    --heading: #f5f5f5;
    --on-heading: #0a0a0a;
    --accent: #3b82f6;
    --accent-light: rgba(37, 99, 235, 0.12);
    --accent-border: rgba(37, 99, 235, 0.38);
    --green: #22c55e;
    --spot: rgba(37, 99, 235, 0.1);
    --selection: rgba(59, 130, 246, 0.3);
    --glow-1: #1e3a8a;
    --glow-2: #172554;
    --glow-3: #1e40af;
    --glow-strength: 0.6;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0a0a0a;
  --surface: #141414;
  --surface2: #1a1a1a;
  --border: #2a2a2a;
  --border-light: #3a3a3a;
  --text: #e5e5e5;
  --text-secondary: #a0a0a0;
  --text-tertiary: #666666;
  --heading: #f5f5f5;
  --on-heading: #0a0a0a;
  --accent: #3b82f6;
  --accent-light: rgba(37, 99, 235, 0.12);
  --accent-border: rgba(37, 99, 235, 0.38);
  --green: #22c55e;
  --spot: rgba(37, 99, 235, 0.1);
  --selection: rgba(59, 130, 246, 0.3);
  --glow-1: #1e3a8a;
  --glow-2: #172554;
  --glow-3: #1e40af;
  --glow-strength: 0.6;
  color-scheme: dark;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
}

body {
  margin: 0;
  font-family: var(--font-body);
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.3s ease, color 0.3s ease;
}

::selection {
  background: var(--selection);
}

a {
  color: inherit;
}

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

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

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

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--bg) 75%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  gap: 20px;
  height: 60px;
}

.logo {
  font-weight: 600;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: var(--heading);
  margin-right: auto;
}

.nav-links {
  position: relative;
  display: flex;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  position: relative;
  z-index: 1;
  display: block;
  padding: 6px 12px;
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: color 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--heading);
}

/* Sliding pill behind the active nav link */
.nav-pill {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 0;
  border-radius: 6px;
  background: var(--surface2);
  border: 1px solid var(--border);
  opacity: 0;
  pointer-events: none;
}

.theme-toggle {
  display: grid;
  place-items: center;
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  width: 34px;
  height: 34px;
  cursor: pointer;
  transition: border-color 0.2s ease;
}

.theme-toggle:hover {
  border-color: var(--border-light);
}

.icon-moon {
  display: none;
}

:root[data-theme="dark"] .icon-sun {
  display: none;
}

:root[data-theme="dark"] .icon-moon {
  display: block;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .icon-sun {
    display: none;
  }
  :root:not([data-theme="light"]) .icon-moon {
    display: block;
  }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}

.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  align-items: center;
  gap: 48px;
  min-height: min(760px, calc(100vh - 60px));
  padding-top: 96px;
  padding-bottom: 96px;
}

.eyebrow {
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  margin: 0 0 12px;
}

.hero h1 {
  font-size: clamp(2.8rem, 7vw, 5rem);
  font-weight: 400;
  line-height: 1;
  letter-spacing: -0.035em;
  color: var(--heading);
  margin: 0 0 24px;
}

.hero h1 .char {
  display: inline-block;
  white-space: pre;
}

.tagline {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 0 36px;
  line-height: 1.6;
}

/* Rolling word (slot machine) */
.roller {
  display: inline-flex;
  position: relative;
  vertical-align: bottom;
  height: 1.6em;
  overflow: hidden;
  color: var(--accent);
  font-weight: 500;
}

.roller-word {
  display: block;
  white-space: nowrap;
}

.hero-actions,
.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  border-radius: 6px;
  font: inherit;
  font-size: 0.92rem;
  font-weight: 500;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: opacity 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
  will-change: transform;
}

.btn-primary {
  background: var(--heading);
  color: var(--on-heading);
}

.btn-primary:hover {
  opacity: 0.85;
}

.btn-ghost {
  background: color-mix(in srgb, var(--surface) 60%, transparent);
  border-color: var(--border);
  color: var(--text);
}

.btn-ghost:hover {
  border-color: var(--border-light);
}

/* ---------- Terminal ---------- */
.terminal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}

.terminal-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 11px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--surface2);
}

.terminal-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--border-light);
}

.terminal-title {
  margin-left: auto;
  margin-right: auto;
  font-size: 0.72rem;
  color: var(--text-tertiary);
  transform: translateX(-14px);
}

.terminal-body {
  margin: 0;
  padding: 18px 20px;
  font-size: 0.82rem;
  line-height: 1.9;
  min-height: 15.5em;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--text);
}

.terminal-body .prompt {
  color: var(--green);
}

.terminal-body .muted {
  color: var(--text-secondary);
}

.terminal-body .accent {
  color: var(--accent);
}

.cursor {
  display: inline-block;
  width: 0.55em;
  height: 1.1em;
  vertical-align: text-bottom;
  background: var(--text);
  animation: blink 1s steps(1) infinite;
}

@keyframes blink {
  50% {
    opacity: 0;
  }
}

/* ---------- Sections ---------- */
.section {
  padding-top: 112px;
  padding-bottom: 32px;
}

.section-head {
  margin-bottom: 40px;
}

.section h2 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 400;
  letter-spacing: -0.025em;
  line-height: 1.15;
  color: var(--heading);
  margin: 0 0 12px;
}

.split-words .word {
  display: inline-block;
}

.section-intro {
  color: var(--text-secondary);
  margin: 0;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
}

/* ---------- Filters ---------- */
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}

.filter {
  font: inherit;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
}

.filter:hover {
  border-color: var(--border-light);
  color: var(--text);
}

.filter[aria-pressed="true"] {
  background: var(--heading);
  border-color: var(--heading);
  color: var(--on-heading);
}

/* ---------- Projects ---------- */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  perspective: 1200px;
}

.project-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: border-color 0.2s ease;
  transform-style: preserve-3d;
  will-change: transform;
}

.project-card:hover {
  border-color: var(--border-light);
}

/* Cursor-following spotlight */
.project-card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background: radial-gradient(420px circle at var(--mx, 50%) var(--my, 50%), var(--spot), transparent 45%);
  opacity: 0;
  transition: opacity 0.25s ease;
}

.project-card:hover::after {
  opacity: 1;
}

.project-card.hidden {
  display: none;
}

.project-thumb {
  position: relative;
  aspect-ratio: 16 / 9;
  background: var(--surface2);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}

.project-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--ease-out);
}

.project-card:hover .project-thumb img {
  transform: scale(1.04);
}

/* Placeholder art: dot grid + soft colour wash + index number */
.thumb-placeholder {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at var(--hx, 30%) var(--hy, 30%), var(--hue, var(--accent-light)), transparent 60%),
    radial-gradient(var(--border-light) 1px, transparent 1px);
  background-size: 100% 100%, 16px 16px;
  transition: background-position 0.6s var(--ease-out);
}

.thumb-index {
  position: absolute;
  left: 18px;
  bottom: 14px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

.thumb-title {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: 1.6rem;
  font-weight: 400;
  letter-spacing: -0.03em;
  color: var(--text-tertiary);
  transition: color 0.3s ease, transform 0.6s var(--ease-out);
}

.project-card:hover .thumb-title {
  color: var(--heading);
  transform: scale(1.04);
}

.project-body {
  padding: 20px 22px 22px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.project-body h3 {
  margin: 0 0 6px;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--heading);
}

.project-body p {
  margin: 0 0 16px;
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.65;
}

.project-links {
  margin-top: auto;
  display: flex;
  align-items: center;
  gap: 16px;
  padding-top: 4px;
  position: relative;
  z-index: 1;
}

.link {
  color: var(--heading);
  font-weight: 500;
  text-decoration: none;
  font-size: 0.88rem;
  background: linear-gradient(currentColor, currentColor) 0 100% / 0 1px no-repeat;
  transition: background-size 0.3s var(--ease-out);
}

.link:hover {
  background-size: 100% 1px;
}

.badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-secondary);
  border: 1px dashed var(--border-light);
  border-radius: 4px;
  padding: 2px 8px;
}

/* ---------- Tags ---------- */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
}

.tag-list li {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--accent);
  background: var(--accent-light);
  border: 1px solid var(--accent-border);
  padding: 2px 8px;
  border-radius: 4px;
}

/* ---------- About ---------- */
.about {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 40px;
  align-items: start;
}

.about-text p {
  margin: 0 0 16px;
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--text-secondary);
}

.skills {
  padding: 22px;
}

.skills h3 {
  margin: 0 0 14px;
  font-size: 0.8rem;
  font-weight: 500;
  font-family: var(--font-mono);
  color: var(--text-secondary);
}

.skills .tag-list {
  margin: 0;
}

/* ---------- Contact ---------- */
.contact {
  padding: clamp(28px, 6vw, 64px);
  text-align: center;
}

.contact .section-intro {
  margin-bottom: 28px;
}

.contact-links {
  justify-content: center;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-top: 112px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.back-to-top {
  text-decoration: none;
  font-size: 0.75rem;
}

.back-to-top:hover {
  color: var(--heading);
}

/* ---------- Pre-animation states (only when JS + GSAP will animate them in) ---------- */
.js.anim .reveal,
.js.anim .project-card,
.js.anim .hero-terminal,
.js.anim .hero-actions,
.js.anim .eyebrow,
.js.anim .tagline {
  opacity: 0;
}

/* ---------- Mobile ---------- */
@media (max-width: 860px) {
  .hero-grid {
    grid-template-columns: 1fr;
    min-height: 0;
    padding-top: 72px;
    padding-bottom: 72px;
  }

  .about {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

@media (max-width: 640px) {
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }

  .logo {
    font-size: 0.95rem;
  }

  .nav {
    gap: 8px;
  }

  .nav-links a {
    padding: 6px 8px;
    font-size: 0.85rem;
  }

  .section {
    padding-top: 80px;
  }

  .project-grid {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .cursor {
    animation: none;
  }
}

/* ---------- Project title row (title + GitHub icon) ---------- */
.project-title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 4px;
  position: relative;
  z-index: 1;
}

.project-title h3 {
  margin: 0;
}

.gh-link {
  display: inline-grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  transition: color 0.2s ease, border-color 0.2s ease, transform 0.3s var(--ease-out);
}

.gh-link:hover,
.gh-link:focus-visible {
  color: var(--heading);
  border-color: var(--accent-border);
  transform: translateY(-1px);
}

.project-body .project-subtitle {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  line-height: 1.5;
  color: var(--accent);
}

.status-badge {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-secondary);
  border: 1px solid var(--border-light);
  border-radius: 999px;
  padding: 1px 8px;
  white-space: nowrap;
}

.status-badge::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 6px;
  border-radius: 50%;
  background: #d97706;
  vertical-align: 1px;
}

.btn[hidden] {
  display: none;
}