/* ---------- Design tokens ---------- */
:root {
  --bg: #0b0d12;
  --bg-alt: #10131a;
  --surface: #161a23;
  --surface-2: #1c212c;
  --border: #262c39;
  --text: #e9ecf3;
  --text-dim: #9aa3b7;
  --accent: #f7931a;
  --accent-dim: rgba(247, 147, 26, 0.16);
  --accent-glow: rgba(247, 147, 26, 0.35);
  --accent-2: #4fd1c5;
  --radius: 14px;
  --max-w: 1080px;
  --font-head: 'Space Grotesk', ui-sans-serif, sans-serif;
  --font-body: 'Inter', ui-sans-serif, system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
  --shadow: 0 20px 60px -20px rgba(0,0,0,0.55);
}

:root[data-theme="light"] {
  --bg: #f7f6f2;
  --bg-alt: #efeee8;
  --surface: #ffffff;
  --surface-2: #f1f0ea;
  --border: #e1dfd6;
  --text: #1b1d22;
  --text-dim: #5a5f6d;
  --accent: #d97a06;
  --accent-dim: rgba(217, 122, 6, 0.10);
  --accent-glow: rgba(217, 122, 6, 0.25);
  --accent-2: #0f9c8f;
  --shadow: 0 20px 50px -25px rgba(20,20,20,0.25);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}

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

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

h1, h2, h3 { font-family: var(--font-head); font-weight: 600; line-height: 1.15; margin: 0 0 .5em; }
p { margin: 0 0 1em; color: var(--text-dim); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.mono { font-family: var(--font-mono); }
.accent { color: var(--accent); }

.skip-link {
  position: absolute; left: -9999px; top: 0; background: var(--accent); color: #14100a;
  padding: 10px 16px; border-radius: 0 0 8px 0; z-index: 200; font-weight: 600;
}
.skip-link:focus { left: 0; }

/* ---------- Background canvas ---------- */
#bg-canvas {
  position: fixed; inset: 0; width: 100%; height: 100%; z-index: -1;
  opacity: 0.5;
}

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav {
  max-width: var(--max-w); margin: 0 auto; padding: 14px 24px;
  display: flex; align-items: center; gap: 20px;
}
.brand {
  font-family: var(--font-mono); font-weight: 500; font-size: 1.05rem;
  color: var(--text); text-decoration: none; letter-spacing: -0.02em;
}
.brand span { color: var(--accent); }
.cursor-dot { animation: blink 1.1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

.nav-links {
  list-style: none; display: flex; gap: 22px; margin: 0 auto 0 32px; padding: 0;
  flex: 1;
}
.nav-link {
  color: var(--text-dim); font-size: 0.92rem; font-weight: 500; text-decoration: none;
  position: relative; padding: 4px 0;
}
.nav-link:hover { color: var(--text); text-decoration: none; }
.nav-link.is-active { color: var(--accent); }
.nav-link.is-active::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -6px; height: 2px; background: var(--accent);
}

.nav-actions { display: flex; align-items: center; gap: 8px; }
.icon-btn {
  background: var(--surface); border: 1px solid var(--border); color: var(--text);
  width: 36px; height: 36px; border-radius: 10px; display: grid; place-items: center;
  cursor: pointer; transition: border-color .2s ease, transform .2s ease;
}
.icon-btn:hover { border-color: var(--accent); transform: translateY(-1px); }
.icon-sun, .icon-moon { display: none; }
:root[data-theme="dark"] .icon-sun { display: block; }
:root[data-theme="light"] .icon-moon { display: block; }

.nav-toggle {
  display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer;
  padding: 8px;
}
.nav-toggle span { width: 22px; height: 2px; background: var(--text); display: block; }

/* ---------- Hero ---------- */
.hero {
  position: relative; padding: 110px 0 90px; min-height: 78vh;
  display: flex; align-items: center;
}
.hero-inner { width: 100%; }
.eyebrow {
  font-family: var(--font-mono); color: var(--accent-2); font-size: 0.85rem;
  letter-spacing: 0.04em; text-transform: uppercase; margin-bottom: 18px;
}
.hero h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); max-width: 16ch; }
.hero h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); max-width: 20ch; }
.hero-typing { font-size: 1.1rem; color: var(--text-dim); min-height: 1.6em; }
.typing-caret { color: var(--accent); animation: blink 1s steps(1) infinite; }
.hero-lede { max-width: 62ch; font-size: 1.05rem; }
.hero-lede strong { color: var(--text); }

.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0 40px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 12px 20px; border-radius: 999px;
  font-weight: 600; font-size: 0.95rem; cursor: pointer; border: 1px solid transparent;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease, background .18s ease;
  text-decoration: none;
}
.btn:hover { text-decoration: none; transform: translateY(-2px); }
.btn-primary { background: var(--accent); color: #17130b; box-shadow: 0 10px 30px -10px var(--accent-glow); }
.btn-primary:hover { box-shadow: 0 16px 36px -10px var(--accent-glow); }
.btn-ghost { background: var(--surface); color: var(--text); border-color: var(--border); }
.btn-ghost:hover { border-color: var(--accent); }
.btn-small { padding: 8px 14px; font-size: 0.85rem; }
.btn:disabled, .btn:disabled:hover { opacity: 0.65; cursor: not-allowed; transform: none; box-shadow: none; }

.hero-stats {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px;
  background: var(--border); border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; max-width: 520px;
}
.stat { background: var(--surface); padding: 14px 16px; }
.stat-label { display: block; font-size: 0.72rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.05em; }
.stat-value { display: block; font-family: var(--font-mono); font-size: 1rem; margin-top: 4px; color: var(--text); }

.scroll-cue {
  position: absolute; bottom: 24px; left: 50%; transform: translateX(-50%);
  color: var(--text-dim); font-size: 1.2rem; text-decoration: none;
  animation: bob 2.2s ease-in-out infinite;
}
@keyframes bob { 0%, 100% { transform: translate(-50%, 0); } 50% { transform: translate(-50%, 8px); } }

/* ---------- Sections ---------- */
.section { padding: 90px 0; }
.section-alt { background: var(--bg-alt); }
.section-title { font-size: clamp(1.5rem, 3vw, 2rem); display: flex; align-items: baseline; gap: 12px; }
.tag-mono { font-family: var(--font-mono); color: var(--accent); font-size: 0.9rem; }
.section-lede { max-width: 62ch; font-size: 1.02rem; }

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 48px; align-items: start; margin-top: 32px; }
.fun-fact { padding-left: 14px; border-left: 2px solid var(--accent); color: var(--text-dim); }
.about-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px; box-shadow: var(--shadow);
}
.avatar-frame {
  width: 84px; height: 84px; border-radius: 20px; margin-bottom: 20px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: grid; place-items: center; font-family: var(--font-head); font-weight: 700; font-size: 1.6rem; color: #14100a;
  overflow: hidden;
}
.avatar-frame img { width: 100%; height: 100%; object-fit: cover; display: block; }
.about-facts { list-style: none; margin: 0 0 22px; padding: 0; display: grid; gap: 10px; }
.about-facts li { display: flex; justify-content: space-between; gap: 10px; font-size: 0.9rem; border-bottom: 1px dashed var(--border); padding-bottom: 8px; }
.about-facts li span { color: var(--text-dim); }
.about-socials { display: flex; flex-wrap: wrap; gap: 14px; }
.about-socials a { font-size: 0.9rem; font-weight: 600; }

/* ---------- Timeline ---------- */
.timeline { position: relative; margin-top: 40px; padding-left: 28px; border-left: 2px solid var(--border); }
.timeline-item { position: relative; padding-bottom: 40px; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-dot {
  position: absolute; left: -35px; top: 4px; width: 12px; height: 12px; border-radius: 50%;
  background: var(--accent); box-shadow: 0 0 0 4px var(--accent-dim);
}
.timeline-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 10px; margin-bottom: 8px; }
.timeline-head h3 { margin: 0; font-size: 1.15rem; }
.timeline-org { color: var(--accent-2); font-weight: 600; font-size: 0.9rem; }
.timeline-date { font-family: var(--font-mono); font-size: 0.82rem; color: var(--text-dim); margin-left: auto; }
.timeline-content ul { margin: 0; padding-left: 20px; color: var(--text-dim); }
.timeline-content li { margin-bottom: 6px; }

/* ---------- Skills ---------- */
.skills-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 20px; margin-top: 32px; }
.skill-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }
.skill-card h3 { font-size: 1rem; margin-bottom: 14px; }
.pill-row { display: flex; flex-wrap: wrap; gap: 8px; }
.pill {
  font-family: var(--font-mono); font-size: 0.78rem; padding: 6px 12px; border-radius: 999px;
  background: var(--surface-2); border: 1px solid var(--border); color: var(--text-dim);
}
.pill-accent { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); background: var(--accent-dim); }
.pill-learning { color: var(--accent-2); border-style: dashed; }

/* ---------- Projects ---------- */
.filter-row { display: flex; flex-wrap: wrap; gap: 10px; margin: 32px 0 28px; }
.filter-btn {
  font-family: var(--font-mono); font-size: 0.82rem; padding: 8px 16px; border-radius: 999px;
  background: var(--surface); border: 1px solid var(--border); color: var(--text-dim); cursor: pointer;
  transition: all .18s ease;
}
.filter-btn:hover { border-color: var(--accent); color: var(--text); }
.filter-btn.is-active { background: var(--accent); color: #17130b; border-color: var(--accent); font-weight: 600; }

.projects-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.project-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.project-card:hover { transform: translateY(-4px); border-color: color-mix(in srgb, var(--accent) 50%, var(--border)); box-shadow: var(--shadow); }
.project-top { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; margin-bottom: 10px; flex-wrap: wrap; }
.project-top h3 { margin: 0; font-size: 1.08rem; }
.project-stack { font-size: 0.75rem; color: var(--accent-2); white-space: nowrap; }
.project-card p { margin: 0; font-size: 0.92rem; }
.project-card[hidden] { display: none; }

/* ---------- Writing ---------- */
.writing-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; margin-top: 28px; }
.writing-card {
  display: block; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px; color: var(--text); transition: transform .2s ease, border-color .2s ease;
}
.writing-card:hover { transform: translateY(-4px); border-color: color-mix(in srgb, var(--accent) 50%, var(--border)); text-decoration: none; }
.writing-tag {
  display: inline-block; font-family: var(--font-mono); font-size: 0.7rem; color: var(--accent);
  background: var(--accent-dim); padding: 4px 10px; border-radius: 999px; margin-bottom: 12px;
}
.writing-card h3 { font-size: 1.02rem; margin-bottom: 8px; }
.writing-card p { font-size: 0.88rem; margin: 0; }
.writing-more { margin-top: 28px; }

/* ---------- Journey ---------- */
.journey { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; margin-top: 32px; }
.journey-item { border-left: 2px solid var(--accent); padding-left: 18px; }
.journey-item h3 { font-size: 1rem; margin-bottom: 6px; }
.journey-item p { font-size: 0.9rem; margin: 0; }

/* ---------- Hash playground ---------- */
.hash-lab {
  margin-top: 32px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px; display: grid; gap: 16px;
}
.hash-label { display: block; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-dim); margin-bottom: 8px; }
.hash-input {
  width: 100%; background: var(--surface-2); color: var(--text); border: 1px solid var(--border);
  border-radius: 10px; padding: 14px; font-family: var(--font-mono); font-size: 0.95rem; resize: vertical;
}
.hash-input:focus { outline: 2px solid var(--accent); outline-offset: 2px; }
.hash-output { background: var(--surface-2); border: 1px solid var(--border); border-radius: 10px; padding: 14px; overflow-wrap: anywhere; }
.hash-value { color: var(--accent-2); font-size: 0.92rem; }
.hash-meta { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px; font-size: 0.85rem; color: var(--text-dim); }
.hash-hint { max-width: 42ch; }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.contact-email-row { display: flex; align-items: center; gap: 12px; margin: 18px 0 22px; }
.contact-email-row code { font-size: 1rem; color: var(--accent-2); }
.contact-socials { margin-top: 4px; }
.contact-form { display: grid; gap: 16px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; }
.contact-form label { display: grid; gap: 6px; font-size: 0.85rem; color: var(--text-dim); }
.contact-form input, .contact-form textarea {
  background: var(--surface-2); border: 1px solid var(--border); border-radius: 10px; padding: 12px;
  color: var(--text); font-family: var(--font-body); font-size: 0.95rem; resize: vertical;
}
.contact-form input:focus, .contact-form textarea:focus { outline: 2px solid var(--accent); outline-offset: 2px; }
.form-note { font-size: 0.78rem; color: var(--text-dim); margin: 0; }
.form-note code { color: var(--accent-2); }
.form-status { font-size: 0.88rem; padding: 12px 14px; border-radius: 10px; line-height: 1.4; }
.form-status[hidden] { display: none; }
.form-status.is-success { background: var(--accent-dim); border: 1px solid var(--accent); color: var(--text); }
.form-status.is-error { background: rgba(239, 68, 68, 0.12); border: 1px solid rgba(239, 68, 68, 0.4); color: #fca5a5; }
:root[data-theme="light"] .form-status.is-error { color: #b91c1c; background: rgba(239, 68, 68, 0.08); border-color: rgba(239, 68, 68, 0.35); }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--border); padding: 26px 0; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; }
.footer-inner p { margin: 0; font-size: 0.85rem; }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 720px) {
  .nav-links {
    position: fixed; inset: 64px 16px auto 16px; flex-direction: column; gap: 4px;
    background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
    padding: 12px; box-shadow: var(--shadow);
    transform-origin: top; transform: scaleY(0); opacity: 0; pointer-events: none;
    transition: transform .18s ease, opacity .18s ease;
  }
  .nav-links.is-open { transform: scaleY(1); opacity: 1; pointer-events: auto; }
  .nav-links li { width: 100%; }
  .nav-link { display: block; padding: 10px 8px; }
  .nav-toggle { display: flex; }
  .hero { padding: 90px 0 70px; }
}