/* ============================================================
   Portfolio — refined Apple-inspired dark system
   ============================================================ */

:root {
  /* Surfaces */
  --bg:           #000;
  --bg-1:         #0a0a0c;
  --bg-2:         #131316;
  --bg-3:         #1c1c1f;

  /* Text */
  --fg:           #f5f5f7;
  --fg-dim:       #a1a1a6;
  --fg-faint:     #6e6e73;
  --fg-line:      #27272a;

  /* Accents — neon orange on deep black */
  --signal:       #ff6a00;      /* neon orange — bright but not cartoon */
  --signal-soft:  #ff6a0022;
  --accent:       #0a84ff;      /* iOS system blue */

  /* Typography */
  --font-display: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Inter", "Helvetica Neue", sans-serif;
  --font-text:    -apple-system, BlinkMacSystemFont, "SF Pro Text", "Inter", "Helvetica Neue", sans-serif;
  --font-mono:    ui-monospace, "SF Mono", "JetBrains Mono", Menlo, monospace;

  /* Rhythm */
  --radius:       18px;
  --radius-lg:    22px;
  --radius-sm:    10px;
  --max-w:        1180px;

  /* Motion */
  --ease:         cubic-bezier(.22, .61, .36, 1);
  --ease-out:     cubic-bezier(.16, 1, .3, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-text);
  font-size: 17px;
  line-height: 1.5;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  letter-spacing: -.005em;
  background-image:
    radial-gradient(1200px 600px at 15% -10%, rgba(255, 106, 0, .06), transparent 60%),
    radial-gradient(1000px 500px at 90% 110%, rgba(10, 132, 255, .05), transparent 60%);
  background-attachment: fixed;
}

a { color: inherit; text-decoration: none; transition: opacity .2s var(--ease), color .2s var(--ease); }
a:hover { opacity: .72; }

::selection { background: var(--signal-soft); color: var(--fg); }

code, .mono { font-family: var(--font-mono); font-size: .92em; letter-spacing: 0; }

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

/* ============================================================
   Nav — glass, floating
   ============================================================ */

.nav {
  position: sticky; top: 12px; z-index: 20;
  margin: 12px auto 0;
  max-width: calc(var(--max-w) + 24px);
  padding: 0 12px;
}
.nav-inner {
  background: rgba(18, 18, 22, .72);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  border: 1px solid rgba(255, 255, 255, .06);
  border-radius: 999px;
  padding: 10px 20px 10px 18px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px;
}
.nav-brand {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -.005em;
  display: flex; align-items: center; gap: 10px;
  color: var(--fg);
}
.nav-brand .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 0 rgba(255, 106, 0, .5);
  animation: live-pulse 2.2s var(--ease) infinite;
}
@keyframes live-pulse {
  0%   { box-shadow: 0 0 0 0 rgba(255, 106, 0, .45); }
  70%  { box-shadow: 0 0 0 10px rgba(255, 106, 0, 0); }
  100% { box-shadow: 0 0 0 0 rgba(255, 106, 0, 0); }
}
.nav-links { display: flex; gap: 22px; font-size: 14px; align-items: center; }
.nav-links a { color: var(--fg-dim); font-weight: 500; }
.nav-links a:hover { color: var(--fg); opacity: 1; }
.nav-links a.cta {
  color: var(--fg);
  background: var(--signal);
  padding: 7px 14px;
  border-radius: 999px;
  font-weight: 600;
  color: #0a0a0c;
}
.nav-links a.cta:hover { opacity: .9; }

@media (max-width: 640px) {
  .nav { margin-top: 8px; padding: 0 8px; }
  .nav-inner { padding: 9px 14px; }
  .nav-links { gap: 14px; }
  .nav-links a:not(.cta) { display: none; }
}

/* ============================================================
   Sections — generous breathing room
   ============================================================ */

.section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 140px 28px;
}
.section-label {
  font-family: var(--font-text);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--signal);
  margin-bottom: 20px;
  text-transform: none;
}
.section h2 {
  font-family: var(--font-display);
  font-size: 56px;
  font-weight: 600;
  letter-spacing: -.03em;
  line-height: 1.05;
  margin-bottom: 18px;
  color: var(--fg);
}
.section p.lead {
  font-size: 20px;
  color: var(--fg-dim);
  max-width: 680px;
  margin-bottom: 56px;
  line-height: 1.45;
  font-weight: 400;
}

@media (max-width: 760px) {
  .section { padding: 88px 20px; }
  .section h2 { font-size: 36px; }
  .section p.lead { font-size: 17px; margin-bottom: 40px; }
}

/* ============================================================
   Hero — big, spacious, considered
   ============================================================ */

.hero {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 140px 28px 100px;
  position: relative;
}
.hero-tag {
  font-size: 13px;
  font-weight: 500;
  color: var(--fg-dim);
  letter-spacing: .01em;
  margin-bottom: 28px;
  display: inline-flex; align-items: center; gap: 10px;
  padding: 7px 14px;
  background: rgba(255, 255, 255, .04);
  border: 1px solid rgba(255, 255, 255, .07);
  border-radius: 999px;
}
.hero-tag .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 8px rgba(255, 106, 0, .6);
}
.hero h1 {
  font-family: var(--font-display);
  font-size: 88px;
  font-weight: 600;
  letter-spacing: -.035em;
  line-height: 1.02;
  margin-bottom: 32px;
  max-width: 960px;
}
.hero h1 .emphasis {
  background: linear-gradient(180deg, var(--signal), #ffa845);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero p.hero-sub {
  font-size: 22px;
  color: var(--fg-dim);
  max-width: 720px;
  line-height: 1.45;
  margin-bottom: 44px;
  font-weight: 400;
}
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 24px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 500;
  border: 1px solid rgba(255, 255, 255, .12);
  background: transparent;
  color: var(--fg);
  cursor: pointer;
  transition: background .2s var(--ease), border-color .2s var(--ease), transform .2s var(--ease);
  letter-spacing: -.01em;
}
.btn:hover { background: rgba(255, 255, 255, .06); border-color: rgba(255, 255, 255, .22); opacity: 1; }
.btn.primary {
  background: var(--signal);
  color: #0a0a0c;
  border-color: transparent;
  font-weight: 600;
}
.btn.primary:hover { background: #ffa845; opacity: 1; }

@media (max-width: 760px) {
  .hero { padding: 80px 20px 56px; }
  .hero h1 { font-size: 48px; letter-spacing: -.025em; }
  .hero p.hero-sub { font-size: 18px; }
}

/* ============================================================
   Stats strip — tabular, refined
   ============================================================ */

.stats-strip {
  border-top: 1px solid var(--fg-line);
  border-bottom: 1px solid var(--fg-line);
  background: linear-gradient(180deg, rgba(255, 255, 255, .015), rgba(255, 255, 255, 0));
}
.stats-strip-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 44px 28px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 40px;
}
.stat-num {
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 600;
  color: var(--fg);
  letter-spacing: -.025em;
  line-height: 1;
}
.stat-label {
  font-size: 13.5px;
  color: var(--fg-dim);
  margin-top: 10px;
  font-weight: 500;
  letter-spacing: -.005em;
}

@media (max-width: 640px) {
  .stats-strip-inner { padding: 28px 20px; gap: 24px; }
  .stat-num { font-size: 30px; }
}

/* ============================================================
   Project cards — soft depth, rounded, Apple-card
   ============================================================ */

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: 20px;
}
.project {
  background: linear-gradient(180deg, var(--bg-2), var(--bg-1));
  border: 1px solid rgba(255, 255, 255, .06);
  border-radius: var(--radius-lg);
  padding: 34px 32px;
  display: flex; flex-direction: column;
  transition: transform .3s var(--ease-out), border-color .3s var(--ease);
  position: relative;
  overflow: hidden;
}
.project::before {
  content: "";
  position: absolute; inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, rgba(255, 106, 0, .3), transparent 40%, transparent 70%, rgba(10, 132, 255, .15));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude;
  opacity: 0; transition: opacity .3s var(--ease);
  pointer-events: none;
}
.project:hover { transform: translateY(-3px); border-color: rgba(255, 255, 255, .12); }
.project:hover::before { opacity: 1; }
.project-media {
  position: relative;
  aspect-ratio: 16 / 9;
  border-radius: 14px;
  overflow: hidden;
  margin: -10px -8px 22px;
  background: linear-gradient(135deg, #0c0c10 0%, #14141a 100%);
  border: 1px solid rgba(255, 255, 255, .05);
  display: flex; align-items: center; justify-content: center;
}
.project-media::after {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(120% 80% at 50% 120%, rgba(255, 255, 255, .04), transparent 60%);
  pointer-events: none;
}
.project-media img, .project-media svg {
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
  transition: transform .6s var(--ease-out);
}
.project:hover .project-media img,
.project:hover .project-media svg { transform: scale(1.04); }
.project-head {
  display: flex; align-items: flex-start; justify-content: space-between;
  gap: 14px;
  margin-bottom: 14px;
}
.project-name {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -.02em;
  color: var(--fg);
  line-height: 1.2;
}
.project-badge {
  font-size: 11px;
  padding: 5px 10px;
  border-radius: 999px;
  letter-spacing: .01em;
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
}
.project-badge.live { background: var(--signal-soft); color: var(--signal); }
.project-badge.beta { background: rgba(10, 132, 255, .15); color: var(--accent); }
.project-badge.public, .project-badge.paper { background: rgba(255, 255, 255, .06); color: var(--fg-dim); }

.project-tagline {
  font-size: 14px;
  color: var(--fg-dim);
  margin-bottom: 18px;
  font-weight: 500;
  letter-spacing: -.005em;
}
.project-desc {
  font-size: 15px;
  color: var(--fg-dim);
  line-height: 1.55;
  margin-bottom: 22px;
  flex: 1;
}
.project-desc strong { color: var(--fg); font-weight: 600; }
.project-stack {
  display: flex; gap: 6px; flex-wrap: wrap;
  margin-bottom: 20px;
}
.chip {
  font-family: var(--font-text);
  font-size: 12px;
  padding: 5px 11px;
  background: rgba(255, 255, 255, .04);
  border: 1px solid rgba(255, 255, 255, .06);
  border-radius: 999px;
  color: var(--fg-dim);
  font-weight: 500;
  letter-spacing: -.005em;
}
.project-links { display: flex; gap: 20px; font-size: 14px; font-weight: 500; }
.project-links a { color: var(--signal); }

/* ============================================================
   About + skill grid
   ============================================================ */

.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 64px;
  align-items: start;
}
.about-grid p {
  color: var(--fg-dim);
  margin-bottom: 22px;
  font-size: 17px;
  line-height: 1.55;
}
.about-grid p strong { color: var(--fg); font-weight: 600; }

.skill-group { margin-bottom: 32px; }
.skill-group h3 {
  font-family: var(--font-text);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--fg-dim);
  margin-bottom: 14px;
  text-transform: uppercase;
}
.skill-list { display: flex; flex-wrap: wrap; gap: 7px; }
.skill-list .chip { font-size: 12.5px; padding: 6px 12px; }

@media (max-width: 900px) {
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
}

/* ============================================================
   Footer
   ============================================================ */

.footer {
  border-top: 1px solid var(--fg-line);
  padding: 52px 28px 64px;
  margin-top: 40px;
}
.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex; justify-content: space-between; align-items: center;
  gap: 20px; flex-wrap: wrap;
}
.footer-brand {
  font-size: 14px;
  color: var(--fg-faint);
  font-weight: 500;
}
.footer-links { display: flex; gap: 28px; font-size: 14px; font-weight: 500; }
.footer-links a { color: var(--fg-dim); }
.footer-links a:hover { color: var(--fg); opacity: 1; }

/* ============================================================
   Resume page
   ============================================================ */

.resume-wrap {
  max-width: 820px;
  margin: 0 auto;
  padding: 60px 28px 96px;
}
.resume-head {
  border-bottom: 1px solid var(--fg-line);
  padding-bottom: 28px;
  margin-bottom: 40px;
}
.resume-head h1 {
  font-family: var(--font-display);
  font-size: 48px;
  font-weight: 600;
  letter-spacing: -.03em;
  margin-bottom: 8px;
  color: var(--fg);
}
.resume-head .role {
  color: var(--fg-dim);
  font-size: 17px;
  font-weight: 500;
  margin-bottom: 16px;
  letter-spacing: -.01em;
}
.resume-head .contact {
  display: flex; gap: 18px; flex-wrap: wrap;
  font-size: 14px;
  color: var(--fg-dim);
  font-weight: 500;
}
.resume-head .contact a { color: var(--fg-dim); }
.resume-head .contact a:hover { color: var(--signal); opacity: 1; }

.resume-section { margin-bottom: 48px; }
.resume-section h2 {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--signal);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--fg-line);
  text-transform: uppercase;
}
.resume-item {
  margin-bottom: 28px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px 20px;
  align-items: start;
}
.resume-item .title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  color: var(--fg);
  letter-spacing: -.015em;
  line-height: 1.3;
}
.resume-item .sub {
  font-size: 14.5px;
  color: var(--fg-dim);
  margin-top: 4px;
  font-weight: 400;
}
.resume-item .meta {
  font-size: 13.5px;
  color: var(--fg-dim);
  text-align: right;
  white-space: nowrap;
  font-weight: 500;
  padding-top: 4px;
}
.resume-item ul {
  grid-column: 1 / -1;
  padding-left: 18px;
  margin-top: 12px;
  color: var(--fg-dim);
  font-size: 15px;
  line-height: 1.6;
}
.resume-item ul li { margin-bottom: 6px; }
.resume-item ul strong { color: var(--fg); font-weight: 600; }

.resume-summary {
  font-size: 17px;
  color: var(--fg-dim);
  line-height: 1.6;
  max-width: 720px;
}

.resume-skills .skill-block {
  margin-bottom: 16px;
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 20px;
  align-items: start;
}
.resume-skills .skill-block .key {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--fg);
  letter-spacing: -.005em;
}
.resume-skills .skill-block .val {
  color: var(--fg-dim);
  font-size: 15px;
  line-height: 1.55;
}

.placeholder {
  background: rgba(255, 59, 59, .12);
  color: #ff6666;
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: .92em;
  border: 1px dashed rgba(255, 59, 59, .35);
}

/* Print — clean black-on-white */
@media print {
  body { background: #fff; color: #000; background-image: none; }
  .nav, .footer, .resume-print-hide { display: none !important; }
  .resume-wrap { max-width: 100%; padding: 16px; }
  .resume-head h1, .resume-item .title, .resume-skills .skill-block .key { color: #000; }
  .resume-head .role, .resume-section h2 { color: #111; }
  .resume-head .contact, .resume-item .sub, .resume-item .meta,
  .resume-item ul, .resume-summary, .resume-skills .skill-block .val { color: #333; }
  .resume-section h2 { border-color: #ccc; }
  .resume-head { border-color: #ccc; }
  .placeholder { background: none; color: #aa0000; border: none; padding: 0; }
}

@media (max-width: 640px) {
  .resume-head h1 { font-size: 34px; }
  .resume-item { grid-template-columns: 1fr; }
  .resume-item .meta { text-align: left; }
  .resume-skills .skill-block { grid-template-columns: 1fr; gap: 4px; }
}

/* ============================================================
   Reveal on scroll (applied to .section + .hero children)
   ============================================================ */

.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .8s var(--ease-out), transform .8s var(--ease-out);
}
.reveal.in { opacity: 1; transform: none; }