/* ============================================================
   Christopher Arock — Portfolio
   ============================================================ */

:root {
  --bg: #FAFAFA;
  --surface: #FFFFFF;
  --text: #111111;
  --text-2: #555555;
  --text-3: #8A8F98;
  --border: #ECECEE;
  --border-2: #E4E4E7;
  --accent: #2563EB;
  --accent-2: #1D4ED8;
  --accent-soft: #EEF2FF;
  --danger: #DC2626;
  --warn: #EA580C;
  --radius: 14px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 2px rgba(17, 17, 17, 0.04), 0 1px 3px rgba(17, 17, 17, 0.03);
  --shadow-md: 0 4px 12px rgba(17, 17, 17, 0.05), 0 2px 4px rgba(17, 17, 17, 0.03);
  --shadow-lg: 0 20px 40px -20px rgba(37, 99, 235, 0.15), 0 8px 20px -8px rgba(17, 17, 17, 0.08);
  --container: 1180px;
  --header-h: 68px;
  --ease: cubic-bezier(.2,.7,.2,1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
h1,h2,h3,h4 { font-weight: 700; letter-spacing: -0.02em; margin: 0; color: var(--text); }
p { margin: 0; color: var(--text-2); }
ul, ol { margin: 0; padding: 0; list-style: none; }

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

/* ---------- Background ---------- */
.bg-grid {
  position: fixed; inset: 0; z-index: -2;
  background-image:
    linear-gradient(to right, rgba(17,17,17,0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(17,17,17,0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at 50% 20%, black 40%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 20%, black 40%, transparent 80%);
  pointer-events: none;
}
.bg-blur {
  position: fixed; z-index: -1; border-radius: 50%; pointer-events: none;
  filter: blur(90px); opacity: 0.35;
}
.bg-blur--one { top: -120px; right: -80px; width: 480px; height: 480px;
  background: radial-gradient(circle, rgba(37,99,235,0.35), transparent 70%); }
.bg-blur--two { bottom: -160px; left: -100px; width: 520px; height: 520px;
  background: radial-gradient(circle, rgba(37,99,235,0.18), transparent 70%); }

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  background: rgba(250,250,250,0.72);
  border-bottom: 1px solid transparent;
  transition: border-color .3s var(--ease), background .3s var(--ease);
}
.nav.is-scrolled { border-color: var(--border); background: rgba(255,255,255,0.85); }
.nav__inner {
  height: var(--header-h);
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.nav__brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-weight: 700; letter-spacing: -0.01em;
}
.nav__mark {
  width: 32px; height: 32px; border-radius: 8px;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--text); color: #fff;
}
.nav__links {
  display: flex; align-items: center; gap: 28px;
  font-size: 14px; color: var(--text-2);
}
.nav__links a { transition: color .2s var(--ease); }
.nav__links a:hover { color: var(--text); }
.nav__cta { display: inline-flex; }
.nav__toggle {
  display: none; background: none; border: 0; cursor: pointer; padding: 8px;
  flex-direction: column; gap: 4px;
}
.nav__toggle span { display: block; width: 20px; height: 2px; background: var(--text); border-radius: 2px; transition: transform .25s var(--ease), opacity .2s; }
.nav__toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
.nav__mobile {
  display: none;
  padding: 12px 24px 20px;
  border-top: 1px solid var(--border);
  background: rgba(255,255,255,0.95);
}
.nav__mobile a {
  display: block; padding: 12px 0; color: var(--text-2); font-size: 15px;
  border-bottom: 1px solid var(--border);
}
.nav__mobile a:last-child { border-bottom: 0; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 16px; font-size: 14px; font-weight: 500;
  border-radius: 10px; border: 1px solid transparent;
  transition: transform .15s var(--ease), background .2s var(--ease), border-color .2s var(--ease), box-shadow .2s var(--ease);
  cursor: pointer; white-space: nowrap;
}
.btn--primary { background: var(--text); color: #fff; }
.btn--primary:hover { background: #000; transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn--ghost { background: rgba(255,255,255,0.7); color: var(--text); border-color: var(--border-2); }
.btn--ghost:hover { background: #fff; border-color: #D4D4D8; transform: translateY(-1px); }
.btn--block { width: 100%; justify-content: center; margin-top: 8px; }

/* ---------- Hero ---------- */
.hero { padding: 80px 0 100px; position: relative; }
.hero__grid {
  display: grid; grid-template-columns: 1.05fr 1fr; gap: 64px; align-items: center;
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 12px; border-radius: 999px;
  background: #fff; border: 1px solid var(--border);
  font-size: 12px; font-weight: 500; color: var(--text-2);
  box-shadow: var(--shadow-sm);
}
.dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: #22C55E; box-shadow: 0 0 0 3px rgba(34,197,94,0.15);
}
.hero__title {
  font-size: clamp(2.25rem, 4.6vw, 3.75rem);
  line-height: 1.05; letter-spacing: -0.035em; margin-top: 20px;
}
.accent {
  background: linear-gradient(90deg, var(--accent) 0%, #60A5FA 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero__sub {
  margin-top: 20px; max-width: 560px;
  font-size: 17px; color: var(--text-2);
}
.hero__meta {
  display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px;
}


.meta-pill {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 8px 12px; background: #fff; border: 1px solid var(--border);
  border-radius: 10px; box-shadow: var(--shadow-sm);
  font-size: 13px;
}
.meta-pill__k { color: var(--text-3); font-weight: 500; }
.meta-pill__v { color: var(--text); font-weight: 600; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }

.hero__visual {
  position: relative; aspect-ratio: 1/1; max-width: 520px; margin-left: auto;
}
.hero__svg {
  width: 100%; height: 100%;
  background: #fff; border: 1px solid var(--border);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-lg);
}
.pulse { transform-origin: 240px 240px; animation: pulse 3.5s ease-out infinite; }
@keyframes pulse {
  0% { transform: scale(0.6); opacity: 0.6; }
  100% { transform: scale(1.6); opacity: 0; }
}
.hero__card {
  position: absolute; left: -20px; bottom: -30px;
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px 18px; box-shadow: var(--shadow-lg);
  min-width: 280px; font-size: 13px;
}
.hero__card-row {
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  padding: 8px 0; border-bottom: 1px dashed var(--border);
}
.hero__card-row:last-child { border-bottom: 0; }
.hero__card-k { color: var(--text-3); font-weight: 500; }
.hero__card-v { color: var(--text); font-weight: 600; display: inline-flex; align-items: center; gap: 8px; }
.chip {
  display: inline-flex; align-items: center; font-size: 11px; font-weight: 600;
  padding: 3px 8px; border-radius: 999px; background: var(--accent-soft); color: var(--accent);
  border: 1px solid rgba(37,99,235,0.15);
}
.chip--danger { background: #FEF2F2; color: var(--danger); border-color: rgba(220,38,38,0.15); }

/* ---------- Sections ---------- */
.section { padding: 100px 0; position: relative; }
.section--muted { background: linear-gradient(180deg, transparent, #F5F5F7 40%, #F5F5F7 60%, transparent); }
.section__head { max-width: 720px; margin-bottom: 56px; }
.section__label {
  display: inline-block; font-size: 12px; font-weight: 600; letter-spacing: 0.08em;
  color: var(--accent); text-transform: uppercase; margin-bottom: 14px;
}
.section__title { font-size: clamp(1.75rem, 3vw, 2.5rem); line-height: 1.15; letter-spacing: -0.03em; }
.section__lede { margin-top: 16px; font-size: 17px; }

/* ---------- About ---------- */
.about__grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 48px; align-items: start; }
.story { position: relative; padding-left: 12px; }
.story li {
  display: grid; grid-template-columns: 80px 1fr; gap: 20px;
  padding: 20px 0; border-bottom: 1px solid var(--border);
}
.story li:last-child { border-bottom: 0; }
.story__year {
  font-family: 'JetBrains Mono', monospace; font-size: 13px;
  color: var(--text-3); font-weight: 500; padding-top: 4px;
}
.story h4 { font-size: 16px; }
.story p { margin-top: 4px; font-size: 14px; }

.about__aside { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.stat-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px; box-shadow: var(--shadow-sm); transition: transform .25s var(--ease), box-shadow .25s var(--ease);
}
.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.stat-card__num {
  font-size: 34px; font-weight: 700; letter-spacing: -0.03em; color: var(--text);
}
.stat-card__num span { color: var(--accent); }
.stat-card__k { font-size: 13px; color: var(--text-2); margin-top: 6px; }

/* ---------- Timeline ---------- */
.timeline { position: relative; padding-left: 32px; }
.timeline::before {
  content: ''; position: absolute; left: 15px; top: 8px; bottom: 8px;
  width: 1px; background: linear-gradient(to bottom, transparent, var(--border-2) 15%, var(--border-2) 85%, transparent);
}
.timeline__item {
  position: relative; padding: 12px 0 32px;
}
.timeline__marker {
  position: absolute; left: -32px; top: 20px;
  width: 32px; height: 32px; border-radius: 50%;
  background: #fff; border: 1px solid var(--border-2);
  display: inline-flex; align-items: center; justify-content: center;
  color: var(--accent); box-shadow: var(--shadow-sm);
}
.timeline__card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px 28px; box-shadow: var(--shadow-sm);
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), border-color .25s var(--ease);
}
.timeline__card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); border-color: var(--border-2); }
.timeline__meta { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; font-size: 13px; color: var(--text-3); }
.timeline__company { font-weight: 500; color: var(--text-2); }
.timeline__when { font-family: 'JetBrains Mono', monospace; }
.timeline__role { font-size: 20px; margin: 8px 0 14px; }
.timeline__list li {
  position: relative; padding-left: 20px; font-size: 15px; color: var(--text-2); margin-bottom: 8px;
}
.timeline__list li::before {
  content: ''; position: absolute; left: 4px; top: 11px;
  width: 5px; height: 5px; border-radius: 50%; background: var(--accent);
}
.timeline__list strong { color: var(--text); font-weight: 600; }

/* ---------- Projects ---------- */
.projects { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.project {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg);
  overflow: hidden; display: flex; flex-direction: column;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}
.project:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: rgba(37,99,235,0.2); }
.project__visual { aspect-ratio: 16/9; background: #F8F9FB; border-bottom: 1px solid var(--border); overflow: hidden; }
.project__visual svg { width: 100%; height: 100%; }
.project__body { padding: 24px; display: flex; flex-direction: column; flex: 1; gap: 14px; }
.project__head { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.project__head h3 { font-size: 18px; }
.project__body p { font-size: 14.5px; line-height: 1.55; }
.project__tags { display: flex; flex-wrap: wrap; gap: 6px; }
.project__tags span {
  font-size: 11.5px; font-weight: 500; padding: 4px 8px; border-radius: 6px;
  background: #F4F4F5; color: var(--text-2); border: 1px solid var(--border);
}
.project__impact {
  margin-top: auto; padding: 12px 14px;
  background: var(--accent-soft); border-radius: 10px;
  font-size: 13px; color: var(--text-2);
  display: grid; gap: 4px;
}
.project__impact-k { font-size: 11px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--accent); font-weight: 600; }
.project__impact strong { color: var(--text); }
.link-arrow {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 14px; font-weight: 500; color: var(--accent);
  transition: gap .2s var(--ease);
}
.link-arrow:hover { gap: 10px; }

/* ---------- Stack ---------- */
.stack { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.stack__group {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px 28px; box-shadow: var(--shadow-sm);
}
.stack__head { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.stack__icon {
  width: 34px; height: 34px; border-radius: 8px;
  background: var(--accent-soft); color: var(--accent);
  display: inline-flex; align-items: center; justify-content: center;
}
.stack__head h4 { font-size: 15px; letter-spacing: -0.01em; }
.badges { display: flex; flex-wrap: wrap; gap: 8px; }
.badges span {
  padding: 6px 12px; font-size: 13px; font-weight: 500;
  background: #F7F7F8; border: 1px solid var(--border); border-radius: 8px; color: var(--text);
  transition: background .2s var(--ease), border-color .2s var(--ease), transform .15s var(--ease);
}
.badges span:hover { background: #fff; border-color: var(--accent); transform: translateY(-1px); }

/* ---------- Certs ---------- */
.certs { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.cert {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; box-shadow: var(--shadow-sm);
  transition: transform .25s var(--ease), box-shadow .25s var(--ease);
}
.cert:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.cert__badge {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 60px; height: 34px; padding: 0 12px;
  border-radius: 8px; background: var(--text); color: #fff;
  font-size: 13px; font-weight: 700; letter-spacing: 0.03em; margin-bottom: 16px;
}
.cert h4 { font-size: 15px; }
.cert p { font-size: 13.5px; margin-top: 4px; }
.cert__date { display: block; font-family: 'JetBrains Mono', monospace; font-size: 12px; color: var(--text-3); margin-top: 14px; }
.cert--feature {
  background: linear-gradient(135deg, #111 0%, #1E293B 100%); color: #fff; border-color: transparent;
}
.cert--feature h4, .cert--feature p { color: #fff; }
.cert--feature p { color: rgba(255,255,255,0.7); }
.cert--feature .cert__date { color: rgba(255,255,255,0.5); }
.cert__badge--feature { background: var(--accent); color: #fff; }

/* ---------- Skills ---------- */
.skills { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.skill {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px; box-shadow: var(--shadow-sm);
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), border-color .25s var(--ease);
  position: relative; overflow: hidden;
}
.skill:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--accent); }
.skill__num {
  font-family: 'JetBrains Mono', monospace; font-size: 12px; color: var(--text-3);
  margin-bottom: 14px;
}
.skill h4 { font-size: 17px; margin-bottom: 8px; }
.skill p { font-size: 14px; line-height: 1.55; }

/* ---------- Contact ---------- */
.contact {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 56px; display: grid; grid-template-columns: 1.4fr 1fr; gap: 56px;
  box-shadow: var(--shadow-md);
}
.contact__list { margin-top: 32px; display: grid; gap: 4px; }
.contact__row {
  display: grid; grid-template-columns: 110px 1fr; align-items: center; gap: 16px;
  padding: 14px 16px; border-radius: 10px;
  transition: background .2s var(--ease);
}
.contact__row:hover { background: #F7F7F8; }
.contact__k { font-size: 12px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-3); font-weight: 600; }
.contact__v { font-size: 15px; color: var(--text); font-weight: 500; }

.contact__card {
  background: linear-gradient(160deg, #F7F8FB 0%, #EEF2FF 100%);
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 32px; align-self: start;
}
.contact__status {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 12px; background: #fff; border: 1px solid var(--border);
  border-radius: 999px; font-size: 12px; font-weight: 500; margin-bottom: 24px;
}
.contact__card h3 { font-size: 18px; line-height: 1.4; margin-bottom: 8px; }
.contact__card p { font-size: 14px; margin-bottom: 20px; }

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--border);
  padding: 32px 0; background: #fff;
  font-size: 13px; color: var(--text-3);
}
.footer__inner { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }

/* ---------- Reveal ---------- */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .pulse { animation: none; }
  html { scroll-behavior: auto; }
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .nav__links, .nav__cta { display: none; }
  .nav__toggle { display: flex; }
  .nav__mobile.is-open { display: block; }

  .hero { padding: 48px 0 72px; }
  .hero__grid { grid-template-columns: 1fr; gap: 48px; }
  .hero__visual { margin: 0 auto; max-width: 440px; }
  .hero__card { left: 0; right: 0; margin: 0 auto; max-width: 320px; }

  .section { padding: 72px 0; }
  .about__grid { grid-template-columns: 1fr; gap: 32px; }
  .projects { grid-template-columns: 1fr; }
  .stack { grid-template-columns: 1fr; }
  .certs { grid-template-columns: repeat(2, 1fr); }
  .skills { grid-template-columns: 1fr; }
  .contact { grid-template-columns: 1fr; padding: 32px; gap: 32px; }
  .contact__row { grid-template-columns: 1fr; gap: 2px; padding: 12px 0; border-bottom: 1px solid var(--border); border-radius: 0; }
  .contact__row:hover { background: transparent; }
}

@media (max-width: 520px) {
  .container { padding: 0 18px; }
  .hero__title { font-size: 2rem; }
  .section__title { font-size: 1.6rem; }
  .certs { grid-template-columns: 1fr; }
  .about__aside { grid-template-columns: 1fr; }
  .timeline__card { padding: 20px; }
}