/* =========================================================
   Pratham Rana — portfolio
   Tokens → base → layout → components → sections
   ========================================================= */

:root {
  --bg: #f6f6f3;
  --bg-elev: #fbfbf9;
  --surface: #ffffff;
  --surface-2: #f0f0eb;
  --border: #e3e3dc;
  --border-strong: #cdcdc4;
  --text: #14161b;
  --text-2: #353a44;
  --muted: #636a77;
  --accent: #3355d6;
  --accent-ink: #ffffff;
  --accent-soft: rgba(51, 85, 214, 0.09);
  --accent-2: #0d9488;
  --accent-2-soft: rgba(13, 148, 136, 0.12);
  --grid-line: rgba(20, 22, 27, 0.055);
  --shadow: 0 1px 2px rgba(16, 18, 24, 0.04), 0 10px 30px rgba(16, 18, 24, 0.07);

  --radius: 14px;
  --font-sans: "Geist", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "Geist Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --nav-h: 64px;

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b0d12;
    --bg-elev: #0f1218;
    --surface: #12151d;
    --surface-2: #181c26;
    --border: #232836;
    --border-strong: #313849;
    --text: #eceef3;
    --text-2: #c4c9d4;
    --muted: #8e96a7;
    --accent: #8fa3ff;
    --accent-ink: #0b0d12;
    --accent-soft: rgba(143, 163, 255, 0.12);
    --accent-2: #4fd1c0;
    --accent-2-soft: rgba(79, 209, 192, 0.14);
    --grid-line: rgba(255, 255, 255, 0.045);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 14px 36px rgba(0, 0, 0, 0.38);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0b0d12;
  --bg-elev: #0f1218;
  --surface: #12151d;
  --surface-2: #181c26;
  --border: #232836;
  --border-strong: #313849;
  --text: #eceef3;
  --text-2: #c4c9d4;
  --muted: #8e96a7;
  --accent: #8fa3ff;
  --accent-ink: #0b0d12;
  --accent-soft: rgba(143, 163, 255, 0.12);
  --accent-2: #4fd1c0;
  --accent-2-soft: rgba(79, 209, 192, 0.14);
  --grid-line: rgba(255, 255, 255, 0.045);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 14px 36px rgba(0, 0, 0, 0.38);
  color-scheme: dark;
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  transition: background-color .25s ease, color .25s ease;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
h1, h2, h3 { margin: 0; line-height: 1.15; letter-spacing: -0.02em; font-weight: 600; }
p { margin: 0; }
ul, ol, dl, dd { margin: 0; padding: 0; list-style: none; }
[hidden] { display: none !important; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }
::selection { background: var(--accent); color: var(--accent-ink); }

.container { width: 100%; max-width: 1120px; margin: 0 auto; padding: 0 16px; }
@media (min-width: 600px) { .container { padding: 0 24px; } }
@media (min-width: 900px) { .container { padding: 0 32px; } }

.skip {
  position: absolute; left: -9999px; top: 10px; z-index: 100;
  padding: 10px 14px; border-radius: 8px;
  background: var(--text); color: var(--bg); font-weight: 500;
}
.skip:focus { left: 16px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 44px; padding: 0 18px; border-radius: 10px;
  font: 500 15px/1 var(--font-sans);
  border: 1px solid transparent; cursor: pointer; white-space: nowrap;
  transition: background-color .15s ease, border-color .15s ease, color .15s ease, transform .15s ease;
}
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--accent); color: var(--accent-ink); }
.btn--primary:hover { background: color-mix(in srgb, var(--accent) 86%, var(--text)); }
.btn--ghost { background: var(--surface); color: var(--text); border-color: var(--border-strong); }
.btn--ghost:hover { border-color: var(--text); }
.btn--sm { height: 38px; padding: 0 14px; font-size: 14px; }
.btn .arrow { transition: transform .15s ease; }
.btn:hover .arrow, a:hover .btn .arrow { transform: translateX(3px); }

.icon-btn {
  width: 38px; height: 38px; flex: none;
  display: grid; place-items: center;
  border-radius: 10px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); cursor: pointer;
  transition: border-color .15s ease;
}
.icon-btn:hover { border-color: var(--border-strong); }

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

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50; height: var(--nav-h);
  background: color-mix(in srgb, var(--bg) 84%, transparent);
  backdrop-filter: saturate(1.4) blur(12px);
  -webkit-backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease, background-color .25s ease;
}
.nav.is-scrolled { border-bottom-color: var(--border); }
.nav__inner { height: 100%; display: flex; align-items: center; gap: 12px; }

.brand { display: flex; align-items: center; gap: 10px; margin-right: auto; font-weight: 600; letter-spacing: -0.01em; }
.brand__mark {
  width: 32px; height: 32px; border-radius: 9px; flex: none;
  display: grid; place-items: center;
  background: var(--text); color: var(--bg);
  font: 500 13px/1 var(--font-mono); letter-spacing: -0.02em;
}

.nav__links { display: flex; gap: 2px; }
.nav__links a {
  padding: 8px 12px; border-radius: 8px;
  color: var(--muted); font-size: 14.5px;
  transition: color .15s ease, background-color .15s ease;
}
.nav__links a:hover, .nav__links a.is-active { color: var(--text); background: var(--surface-2); }

.nav__actions { display: flex; align-items: center; gap: 8px; }
.nav__menu { display: none; }

@media (max-width: 880px) {
  .nav__menu { display: grid; }
  .nav__links {
    display: none;
    position: absolute; top: var(--nav-h); left: 0; right: 0;
    flex-direction: column; gap: 2px;
    padding: 8px 16px 16px;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
  }
  .nav__links.is-open { display: flex; }
  .nav__links a { padding: 12px; font-size: 16px; }
}
@media (max-width: 400px) { .brand__name { display: none; } }

/* ---------- Hero ---------- */
.hero { position: relative; padding: 56px 0 64px; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: radial-gradient(ellipse 75% 70% at 72% 35%, #000 25%, transparent 75%);
          mask-image: radial-gradient(ellipse 75% 70% at 72% 35%, #000 25%, transparent 75%);
}
.hero__grid { position: relative; display: grid; gap: 48px; align-items: center; }
@media (min-width: 980px) {
  .hero { padding: 88px 0 96px; }
  .hero__grid { grid-template-columns: 1.08fr .92fr; gap: 56px; }
}

.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 6px 12px 6px 10px; border-radius: 999px;
  border: 1px solid var(--border); background: var(--surface);
  font: 400 13px/1.2 var(--font-mono); color: var(--muted);
}
.dot { width: 8px; height: 8px; border-radius: 50%; background: #22c55e; box-shadow: 0 0 0 3px rgba(34, 197, 94, .18); }

.hero h1 {
  margin: 22px 0 20px;
  font-size: clamp(2.2rem, 5.4vw, 3.7rem);
  letter-spacing: -0.038em; line-height: 1.06;
  text-wrap: balance;
}
.hero h1 em { font-style: normal; color: var(--accent); }
.lede { max-width: 54ch; font-size: clamp(1.03rem, 1.5vw, 1.15rem); color: var(--text-2); }

.hero__cta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 32px; }
.hero__meta { display: flex; flex-wrap: wrap; align-items: center; gap: 14px 22px; margin-top: 30px; color: var(--muted); font-size: 14px; }
.cert { display: inline-flex; align-items: center; gap: 8px; }
.cert svg { color: var(--accent-2); flex: none; }
.socials { display: inline-flex; gap: 4px; }
.socials a {
  width: 36px; height: 36px; display: grid; place-items: center; border-radius: 9px;
  color: var(--muted); transition: color .15s ease, background-color .15s ease;
}
.socials a:hover { color: var(--text); background: var(--surface-2); }

/* Trace card */
.trace {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 16px; box-shadow: var(--shadow); overflow: hidden;
}
.trace__bar {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 16px; border-bottom: 1px solid var(--border);
  font: 400 12px/1 var(--font-mono); color: var(--muted);
}
.trace__dots { display: inline-flex; gap: 6px; }
.trace__dots span { width: 10px; height: 10px; border-radius: 50%; background: var(--border-strong); }
.trace__title { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.trace__status { margin-left: auto; display: inline-flex; align-items: center; gap: 6px; color: var(--accent-2); white-space: nowrap; }
.pulse-dot { width: 6px; height: 6px; border-radius: 50%; background: currentColor; animation: blink 1.6s ease-in-out infinite; }
@keyframes blink { 50% { opacity: .25; } }

.graph { width: 100%; height: auto; padding: 14px 10px 10px; }
.g-edge { fill: none; stroke: var(--border-strong); stroke-width: 1.5; }
.g-flow { fill: none; stroke: var(--accent); stroke-width: 1.5; stroke-dasharray: 3 9; opacity: .75; animation: flow 1.4s linear infinite; }
@keyframes flow { to { stroke-dashoffset: -24; } }
.g-pulse { fill: var(--accent-2); }
.g-node rect { fill: var(--surface-2); stroke: var(--border-strong); stroke-width: 1; }
.g-node text { fill: var(--text); font-family: var(--font-mono); font-size: 12.5px; font-weight: 500; }
.g-node text.sub { fill: var(--muted); font-size: 10.5px; font-weight: 400; }
.g-node--accent rect { fill: var(--accent-soft); stroke: var(--accent); }
.g-node--guard rect { fill: var(--accent-2-soft); stroke: var(--accent-2); }

.trace__foot { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--border); }
.trace__foot div { padding: 11px 16px; border-right: 1px solid var(--border); font-family: var(--font-mono); }
.trace__foot div:last-child { border-right: 0; }
.trace__foot span { display: block; font-size: 11px; color: var(--muted); }
.trace__foot b { font-size: 13px; font-weight: 500; }

/* ---------- Stats ---------- */
.stats { background: var(--bg-elev); border-block: 1px solid var(--border); }
.stats__grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--border); }
@media (min-width: 880px) { .stats__grid { grid-template-columns: repeat(4, 1fr); } }
.stat { background: var(--bg-elev); padding: 26px 20px; display: flex; flex-direction: column; gap: 4px; }
@media (min-width: 880px) { .stat { padding: 32px 28px; } .stat:first-child { padding-left: 0; } }
.stat__num { font-size: clamp(1.7rem, 3vw, 2.25rem); font-weight: 600; letter-spacing: -0.035em; line-height: 1.1; }
.stat__label { color: var(--muted); font-size: 14px; line-height: 1.4; }

/* ---------- Sections ---------- */
.section { padding: 80px 0; scroll-margin-top: var(--nav-h); }
@media (min-width: 980px) { .section { padding: 112px 0; } }
.section--alt { background: var(--bg-elev); border-block: 1px solid var(--border); }
.section__head { max-width: 720px; margin-bottom: 44px; }
.kicker { margin-bottom: 14px; font: 500 13px/1 var(--font-mono); color: var(--accent); letter-spacing: .02em; }
.section h2 { font-size: clamp(1.85rem, 3.6vw, 2.7rem); letter-spacing: -0.032em; text-wrap: balance; }
.section__head .sub { margin-top: 14px; color: var(--muted); font-size: 1.05rem; }

.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px;
}
.card h3 { font-size: 1.08rem; margin-bottom: 8px; letter-spacing: -0.015em; }
.card p { color: var(--muted); font-size: 15px; }

/* ---------- About ---------- */
.about { display: grid; gap: 32px; }
@media (min-width: 980px) { .about { grid-template-columns: 1.35fr 1fr; gap: 64px; align-items: start; } }
.about__text p { font-size: 1.08rem; color: var(--text-2); }
.about__text p + p { margin-top: 18px; }

.facts { border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); padding: 4px 20px; }
.facts div { display: flex; justify-content: space-between; gap: 16px; padding: 13px 0; border-bottom: 1px solid var(--border); font-size: 14.5px; }
.facts div:last-child { border-bottom: 0; }
.facts dt { color: var(--muted); flex: none; }
.facts dd { text-align: right; font-weight: 500; }

.focus { display: grid; gap: 16px; margin-top: 48px; }
@media (min-width: 780px) { .focus { grid-template-columns: repeat(3, 1fr); } }
.focus__icon {
  width: 40px; height: 40px; border-radius: 10px; margin-bottom: 18px;
  display: grid; place-items: center;
  background: var(--accent-soft); color: var(--accent);
}

/* ---------- Experience ---------- */
.roles { display: grid; gap: 16px; }
.role {
  display: grid; gap: 14px 40px;
  padding: 26px; border: 1px solid var(--border); border-radius: 16px; background: var(--surface);
}
@media (min-width: 880px) { .role { grid-template-columns: 190px 1fr; padding: 34px; } }
.role__meta { display: flex; flex-direction: column; gap: 4px; font: 400 13px/1.5 var(--font-mono); color: var(--muted); }
.role__meta .now { color: var(--accent-2); }
.role__body h3 { font-size: 1.3rem; }
.role__body .org { color: var(--muted); font-weight: 500; }

.bullets { display: grid; gap: 10px; margin-top: 16px; }
.bullets li { position: relative; padding-left: 20px; color: var(--text-2); font-size: 15.5px; }
.bullets li::before {
  content: ""; position: absolute; left: 2px; top: .66em;
  width: 6px; height: 6px; border-radius: 2px; background: var(--accent);
}

.tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 22px; }
.tag {
  padding: 4px 10px; border-radius: 999px;
  border: 1px solid var(--border); background: var(--surface-2);
  font: 400 12px/1.5 var(--font-mono); color: var(--text-2);
}

.roles__pair { display: grid; gap: 16px; }
@media (min-width: 780px) { .roles__pair { grid-template-columns: 1fr 1fr; } }
.mini {
  display: flex; gap: 16px; align-items: flex-start;
  padding: 22px 24px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface);
}
.mini__icon {
  width: 40px; height: 40px; flex: none; border-radius: 10px;
  display: grid; place-items: center; background: var(--accent-2-soft); color: var(--accent-2);
}
.mini__label { font: 500 12px/1 var(--font-mono); color: var(--muted); margin-bottom: 8px; text-transform: uppercase; letter-spacing: .06em; }
.mini h3 { font-size: 1.02rem; letter-spacing: -0.01em; }
.mini__meta { margin-top: 6px; color: var(--muted); font-size: 14px; }

/* ---------- Projects ---------- */
.projects { display: grid; gap: 18px; }
@media (min-width: 880px) {
  .projects { grid-template-columns: repeat(2, 1fr); }
  .project--featured, .project--more { grid-column: 1 / -1; }
}
.project {
  display: flex; flex-direction: column;
  padding: 28px; border: 1px solid var(--border); border-radius: 16px; background: var(--surface);
  transition: border-color .2s ease, box-shadow .2s ease;
}
.project:hover { border-color: var(--border-strong); box-shadow: var(--shadow); }
.project__ctx {
  display: inline-flex; align-items: center; gap: 8px; margin-bottom: 16px;
  font: 400 12.5px/1 var(--font-mono); color: var(--muted);
}
.project__ctx::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--accent-2); }
.project h3 { font-size: 1.45rem; letter-spacing: -0.025em; }
.project__sub { margin-top: 6px; color: var(--accent); font-weight: 500; }
.project__desc { margin-top: 14px; color: var(--text-2); }
.project .tags { margin-top: auto; padding-top: 24px; }

@media (min-width: 880px) {
  .project--featured { padding: 36px; }
  .project--featured h3 { font-size: 1.85rem; }
  .project--featured .project__desc { max-width: 70ch; }
  .project--featured .bullets { grid-template-columns: 1fr 1fr; gap: 12px 36px; margin-top: 22px; }
}
.project--featured {
  background:
    radial-gradient(600px 220px at 100% 0%, var(--accent-soft), transparent 70%),
    var(--surface);
}

.metrics { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.metric { flex: 1 1 140px; padding: 12px 14px; border-radius: 10px; background: var(--accent-soft); }
.metric b { display: block; font-size: 1.4rem; letter-spacing: -0.03em; line-height: 1.2; }
.metric span { font-size: 13px; color: var(--muted); }

.project--more {
  flex-direction: row; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px;
  padding: 24px 28px; border-style: dashed; background: transparent;
}
.project--more h3 { font-size: 1.1rem; }
.project--more p { margin-top: 4px; color: var(--muted); font-size: 15px; }

/* ---------- Skills ---------- */
.skills { display: grid; gap: 16px; }
@media (min-width: 700px) { .skills { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) {
  .skills { grid-template-columns: repeat(3, 1fr); }
  .skill-group--wide { grid-column: span 2; }
}
.skill-group h3 { margin-bottom: 14px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chips li {
  padding: 4px 10px; border-radius: 7px;
  background: var(--surface-2); border: 1px solid var(--border);
  font-size: 13px; color: var(--text-2);
}

/* ---------- Contact / booking ---------- */
.book { display: grid; gap: 32px; }
@media (min-width: 980px) { .book { grid-template-columns: .82fr 1.18fr; gap: 56px; align-items: start; } }
.book__intro > p { font-size: 1.08rem; color: var(--text-2); }

.call-facts { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 20px; color: var(--muted); font-size: 14px; }
.call-facts li { display: inline-flex; align-items: center; gap: 7px; }

.contact-list { display: grid; gap: 10px; margin-top: 28px; }
.contact-list a {
  display: flex; align-items: center; gap: 14px;
  padding: 12px 16px; border: 1px solid var(--border); border-radius: 12px; background: var(--surface);
  transition: border-color .15s ease;
}
.contact-list a:hover { border-color: var(--border-strong); }
.ci { width: 36px; height: 36px; flex: none; border-radius: 9px; display: grid; place-items: center; background: var(--surface-2); }
.contact-list small { display: block; font: 400 12px/1.4 var(--font-mono); color: var(--muted); }
.contact-list .val { font-weight: 500; font-size: 15px; overflow-wrap: anywhere; }

.cal {
  position: relative; overflow: hidden;
  border: 1px solid var(--border); border-radius: 16px; background: var(--surface);
  scroll-margin-top: calc(var(--nav-h) + 20px);
}
#cal-inline { width: 100%; min-height: 600px; overflow: auto; }
.cal-fallback { display: flex; flex-direction: column; align-items: flex-start; gap: 14px; padding: 36px 28px; }
@media (min-width: 600px) { .cal-fallback { padding: 48px 44px; } }
.cal-fallback .focus__icon { margin-bottom: 4px; }
.cal-fallback h3 { font-size: 1.45rem; letter-spacing: -0.025em; }
.cal-fallback p { color: var(--muted); max-width: 46ch; }
.cal-fallback .btn { margin-top: 8px; }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--border); padding: 28px 0 36px; color: var(--muted); font-size: 14px; }
.footer__inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 14px 24px; }
.footer__links { display: flex; flex-wrap: wrap; gap: 6px 20px; }
.footer__links a:hover { color: var(--text); }

/* ---------- Reveal on scroll ---------- */
.js .reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
.js .reveal.is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .reveal { opacity: 1; transform: none; transition: none; }
  .g-flow, .pulse-dot { animation: none; }
  .g-pulses { display: none; }
}