/* ==========================================================================
   Urmi Mishra — Portfolio design system
   Concept: "The annotated product notebook". Paper & ink, an editorial serif
   for voice, mono for annotations, and one signal colour reserved for outcomes.
   ========================================================================== */

/* ---------- 1. Tokens ---------- */
:root {
  /* palette — light (paper) */
  --paper: #f4f1ea;
  --paper-2: #ece8de;          /* recessed surfaces */
  --surface: #fbf9f4;          /* raised cards */
  --ink: #15140f;
  --ink-2: #3b3932;            /* body copy */
  --muted: #6c685f;            /* captions, meta (AA on paper & paper-2) */
  --line: rgba(21, 20, 15, 0.12);
  --line-strong: rgba(21, 20, 15, 0.24);
  --signal: #ef4f16;           /* THE accent. Outcomes, "after" values, focus. 3:1+ on paper */
  --signal-ink: #c63d0b;       /* accessible accent for small text on paper */
  --signal-soft: rgba(239, 79, 22, 0.12);
  --before: #b9b4a8;           /* "before" values in charts */
  --ok: #2f7d4f;               /* sparing: guardrail "held" states */
  --shadow: 0 1px 0 rgba(21,20,15,.04), 0 12px 32px -12px rgba(21,20,15,.18);

  /* type */
  --font-serif: "Instrument Serif", "Iowan Old Style", Georgia, serif;
  --font-sans: "Geist", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "Geist Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --fs-mega: clamp(3.4rem, 10.5vw, 9.5rem);
  --fs-h1: clamp(2.6rem, 6.4vw, 5.6rem);
  --fs-h2: clamp(2rem, 4.2vw, 3.6rem);
  --fs-h3: clamp(1.35rem, 2vw, 1.7rem);
  --fs-lead: clamp(1.12rem, 1.5vw, 1.32rem);
  --fs-body: 1.0625rem;
  --fs-small: 0.9rem;
  --fs-mono: 0.74rem;

  /* space & layout */
  --gutter: clamp(16px, 4vw, 48px);
  --max: 1240px;
  --max-prose: 680px;
  --section: clamp(88px, 13vw, 168px);
  --radius: 14px;
  --radius-sm: 8px;

  /* motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --dur: 0.9s;

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0f0f0d; --paper-2: #161613; --surface: #1a1a17;
    --ink: #efebe2; --ink-2: #c9c5bb; --muted: #8b877d;
    --line: rgba(239, 235, 226, 0.1); --line-strong: rgba(239, 235, 226, 0.22);
    --signal: #ff6a33; --signal-ink: #ff8a5c; --signal-soft: rgba(255, 106, 51, 0.14);
    --before: #4a4842; --ok: #5fbf86;
    --shadow: 0 1px 0 rgba(0,0,0,.3), 0 18px 40px -16px rgba(0,0,0,.7);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #0f0f0d; --paper-2: #161613; --surface: #1a1a17;
  --ink: #efebe2; --ink-2: #c9c5bb; --muted: #8b877d;
  --line: rgba(239, 235, 226, 0.1); --line-strong: rgba(239, 235, 226, 0.22);
  --signal: #ff6a33; --signal-ink: #ff8a5c; --signal-soft: rgba(255, 106, 51, 0.14);
  --before: #4a4842; --ok: #5fbf86;
  --shadow: 0 1px 0 rgba(0,0,0,.3), 0 18px 40px -16px rgba(0,0,0,.7);
  color-scheme: dark;
}

/* ---------- 2. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink-2);
  font: 400 var(--fs-body)/1.65 var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  transition: background-color .5s var(--ease-out), color .5s var(--ease-out);
}
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
h1, h2, h3, h4, p, figure, blockquote, ul, ol, dl, dd { margin: 0; }
ul[role="list"], ol[role="list"] { list-style: none; padding: 0; }
::selection { background: var(--signal); color: #fff; }
:focus-visible { outline: 2px solid var(--signal); outline-offset: 3px; border-radius: 4px; }

.skip-link {
  position: fixed; top: 12px; left: 12px; z-index: 1000;
  padding: 10px 14px; background: var(--ink); color: var(--paper);
  border-radius: var(--radius-sm); transform: translateY(-160%);
  transition: transform .3s var(--ease-out);
}
.skip-link:focus { transform: none; }
.sr-only { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* subtle paper grain — pure CSS/SVG, no image request */
body::before {
  content: ""; position: fixed; inset: 0; z-index: 0; pointer-events: none; opacity: .5;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .05 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
main, .site-header, .site-footer { position: relative; z-index: 1; }

/* ---------- 3. Typography ---------- */
.serif, h1, h2, .h1, .h2, .display {
  font-family: var(--font-serif);
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -0.015em;
  line-height: 1.02;
}
.display { font-size: var(--fs-mega); letter-spacing: -0.035em; line-height: .92; }
h1, .h1 { font-size: var(--fs-h1); letter-spacing: -0.03em; }
h2, .h2 { font-size: var(--fs-h2); letter-spacing: -0.025em; line-height: 1.05; }
h3, .h3 {
  font: 500 var(--fs-h3)/1.25 var(--font-sans);
  color: var(--ink); letter-spacing: -0.02em;
}
h4, .h4 { font: 600 1rem/1.4 var(--font-sans); color: var(--ink); letter-spacing: -0.01em; }
em, .italic { font-style: italic; }
h1 em, h2 em, .display em, .serif em { font-family: var(--font-serif); font-style: italic; }
.accent { color: var(--signal); }
.lead { font-size: var(--fs-lead); line-height: 1.55; color: var(--ink-2); max-width: 60ch; }
.prose { max-width: var(--max-prose); }
.prose > * + * { margin-top: 1.15em; }
.prose strong { color: var(--ink); font-weight: 600; }
.muted { color: var(--muted); }
.small { font-size: var(--fs-small); }

/* mono annotation label: "01 — PROBLEM" */
.eyebrow, .mono {
  font: 500 var(--fs-mono)/1.4 var(--font-mono);
  letter-spacing: .08em; text-transform: uppercase; color: var(--muted);
}
.eyebrow { display: inline-flex; align-items: center; gap: .75em; }
.eyebrow .idx { color: var(--signal-ink); }
.eyebrow::before {
  content: ""; width: 22px; height: 1px; background: currentColor; opacity: .6;
}
.eyebrow.no-rule::before { display: none; }

/* inline link with animated underline */
.link {
  color: var(--ink);
  background: linear-gradient(currentColor, currentColor) 0 100% / 100% 1px no-repeat;
  transition: background-size .5s var(--ease-out), color .3s;
}
.link:hover { background-size: 0 1px; background-position: 100% 100%; color: var(--signal-ink); }

/* highlighted phrase — marker sweep on reveal */
.mark {
  color: var(--ink);
  background: linear-gradient(var(--signal-soft), var(--signal-soft)) 0 88% / 0% 42% no-repeat;
  transition: background-size 1.1s var(--ease-out) .25s;
}
.is-in .mark, .mark.is-in { background-size: 100% 42%; }

/* ---------- 4. Layout ---------- */
.container { width: 100%; max-width: calc(var(--max) + var(--gutter) * 2); margin-inline: auto; padding-inline: var(--gutter); }
.section { padding-block: var(--section); }
.section--tight { padding-block: calc(var(--section) * .6); }
/* stacked sections would otherwise double the gap (bottom + top) */
.section + .section { padding-top: calc(var(--section) * .45); }
.rule { height: 1px; background: var(--line); border: 0; margin: 0; }
.stack > * + * { margin-top: var(--stack, 1rem); }
.grid-12 { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: var(--gutter); }
.section-head { display: grid; gap: 1.25rem; margin-bottom: clamp(40px, 6vw, 80px); }
.section-head--split { grid-template-columns: 1fr; align-items: end; }
@media (min-width: 900px) { .section-head--split { grid-template-columns: 1.3fr 1fr; gap: var(--gutter); } }

/* ---------- 5. Header ---------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  transition: transform .5s var(--ease-out), background-color .4s, border-color .4s, backdrop-filter .4s;
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  -webkit-backdrop-filter: saturate(1.4) blur(14px); backdrop-filter: saturate(1.4) blur(14px);
  border-bottom-color: var(--line);
}
.site-header.is-hidden { transform: translateY(-100%); }
.site-header__inner { display: flex; align-items: center; justify-content: space-between; height: 72px; gap: 1rem; }
.brand { display: inline-flex; align-items: center; gap: .7rem; color: var(--ink); }
.brand__mark {
  width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center;
  background: var(--ink); color: var(--paper);
  font: italic 400 1.15rem/1 var(--font-serif); letter-spacing: -.02em;
  transition: transform .6s var(--ease-out), background-color .3s;
}
.brand:hover .brand__mark { transform: rotate(-12deg) scale(1.05); background: var(--signal); }
.brand__name { font: 500 .95rem/1 var(--font-sans); letter-spacing: -.01em; }
.brand__role { display: none; font: 500 .7rem/1 var(--font-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
@media (min-width: 640px) { .brand__role { display: inline; } }

.nav { display: flex; align-items: center; gap: .25rem; }
.nav__links { display: none; gap: .25rem; }
@media (min-width: 900px) { .nav__links { display: flex; } }
.nav__link {
  position: relative; padding: .55rem .85rem; border-radius: 999px;
  font-size: .92rem; color: var(--ink-2); transition: color .3s, background-color .3s;
}
.nav__link:hover, .nav__link[aria-current="page"] { color: var(--ink); background: var(--paper-2); }
.icon-btn {
  width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center;
  color: var(--ink); transition: background-color .3s, transform .4s var(--ease-out);
}
.icon-btn:hover { background: var(--paper-2); }
.icon-btn svg { width: 18px; height: 18px; }
.theme-toggle .i-moon { display: none; }
:root[data-theme="dark"] .theme-toggle .i-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .i-moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .i-sun { display: none; }
  :root:not([data-theme="light"]) .theme-toggle .i-moon { display: block; }
}
.menu-toggle { display: grid; }
@media (min-width: 900px) { .menu-toggle { display: none; } }
.menu-toggle span { display: block; width: 18px; height: 1.5px; background: currentColor; transition: transform .4s var(--ease-out); }
.menu-toggle span + span { margin-top: 5px; }
.menu-open .menu-toggle span:first-child { transform: translateY(3.25px) rotate(45deg); }
.menu-open .menu-toggle span:last-child { transform: translateY(-3.25px) rotate(-45deg); }

.mobile-nav {
  position: fixed; inset: 72px 0 0 0; z-index: 49; background: var(--paper);
  padding: 32px var(--gutter); display: flex; flex-direction: column; gap: .25rem;
  opacity: 0; visibility: hidden; transform: translateY(-8px);
  transition: opacity .4s var(--ease-out), transform .4s var(--ease-out), visibility .4s;
}
.menu-open .mobile-nav { opacity: 1; visibility: visible; transform: none; }
.mobile-nav a { font: 400 2.4rem/1.25 var(--font-serif); color: var(--ink); padding: .2rem 0; border-bottom: 1px solid var(--line); }
.mobile-nav a .mono { margin-right: .8rem; vertical-align: middle; }

/* ---------- 6. Buttons, chips ---------- */
.btn {
  --btn-bg: var(--ink); --btn-fg: var(--paper);
  position: relative; display: inline-flex; align-items: center; gap: .65rem;
  height: 52px; padding: 0 1.4rem; border-radius: 999px; overflow: hidden; isolation: isolate;
  background: var(--btn-bg); color: var(--btn-fg);
  font: 500 .95rem/1 var(--font-sans); letter-spacing: -.01em; white-space: nowrap;
  transition: transform .5s var(--ease-out), color .4s;
}
.btn::before {
  content: ""; position: absolute; inset: 0; z-index: -1; border-radius: inherit;
  background: var(--signal); transform: translateY(101%);
  transition: transform .55s var(--ease-out);
}
.btn:hover::before { transform: none; }
.btn:hover { color: #fff; }
.btn .arrow { transition: transform .5s var(--ease-out); }
.btn:hover .arrow { transform: translateX(4px); }
.btn--ghost { --btn-bg: transparent; --btn-fg: var(--ink); box-shadow: inset 0 0 0 1px var(--line-strong); }
.btn--sm { height: 40px; padding: 0 1rem; font-size: .88rem; }
.arrow { width: 16px; height: 16px; flex: none; }

.chip {
  display: inline-flex; align-items: center; gap: .45rem; height: 28px; padding: 0 .75rem;
  border-radius: 999px; border: 1px solid var(--line-strong);
  font: 500 .72rem/1 var(--font-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--ink-2);
  white-space: nowrap;
}
.chip--signal { border-color: transparent; background: var(--signal-soft); color: var(--signal-ink); }
.chip--solid { border-color: transparent; background: var(--ink); color: var(--paper); }
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--signal); flex: none; }
.dot--live { position: relative; background: #2fbf71; }
.dot--live::after {
  content: ""; position: absolute; inset: -4px; border-radius: 50%; border: 1px solid #2fbf71;
  animation: ping 2s var(--ease-out) infinite;
}
@keyframes ping { from { transform: scale(.6); opacity: 1; } to { transform: scale(1.8); opacity: 0; } }

/* ---------- 7. Metric primitives ---------- */
.metric { display: grid; gap: .35rem; }
.metric__value {
  font: 400 clamp(3rem, 6vw, 5rem)/.9 var(--font-serif); letter-spacing: -.04em; color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.metric__value .unit { font-size: .55em; letter-spacing: -.02em; margin-left: .04em; }
.metric__value.accent, .metric__value .accent { color: var(--signal); }
.metric__label { font-size: .95rem; color: var(--ink-2); max-width: 26ch; line-height: 1.4; }
.metric__meta { font: 500 var(--fs-mono)/1.4 var(--font-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.delta { display: inline-flex; align-items: center; gap: .3rem; font: 500 .78rem/1 var(--font-mono); color: var(--signal-ink); letter-spacing: .02em; }

/* before → after comparison bars. Set --before & --after as 0–100 numbers on .compare */
.compare { --max-v: 100; display: grid; gap: .9rem; }
.compare__row { display: grid; grid-template-columns: 4.5rem 1fr auto; align-items: center; gap: .9rem; }
.compare__label { font: 500 var(--fs-mono)/1 var(--font-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.compare__track { height: 10px; border-radius: 999px; background: var(--paper-2); overflow: hidden; }
.compare__bar {
  height: 100%; border-radius: inherit; width: calc(var(--v) / var(--max-v) * 100%);
  transform-origin: left; transform: scaleX(0); transition: transform 1.4s var(--ease-out);
}
.compare__row--before .compare__bar { background: var(--before); }
.compare__row--after .compare__bar { background: var(--signal); transition-delay: .25s; }
.compare__num { font: 400 1.6rem/1 var(--font-serif); color: var(--ink); min-width: 3.5ch; text-align: right; font-variant-numeric: tabular-nums; }
.is-in .compare__bar, .compare.is-in .compare__bar { transform: none; }

/* ---------- 8. Cards ---------- */
.card {
  position: relative; background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: clamp(20px, 2.5vw, 32px);
  transition: border-color .4s, transform .6s var(--ease-out), box-shadow .6s var(--ease-out);
}
/* cursor-follow spotlight (core.js sets --mx/--my on [data-spotlight]) */
[data-spotlight] { --mx: 50%; --my: 50%; }
[data-spotlight]::after {
  content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none; opacity: 0;
  background: radial-gradient(420px circle at var(--mx) var(--my), var(--signal-soft), transparent 60%);
  transition: opacity .5s;
}
[data-spotlight]:hover::after { opacity: 1; }

/* annotation — handwritten-feel margin note in mono */
.note {
  position: relative; padding-left: 1rem; border-left: 1px solid var(--signal);
  font: 400 .82rem/1.55 var(--font-mono); color: var(--muted); letter-spacing: 0;
}
.note b { color: var(--signal-ink); font-weight: 500; }

/* ---------- 9. Footer ---------- */
.site-footer { border-top: 1px solid var(--line); padding-block: clamp(56px, 8vw, 96px) 32px; }
.footer-cta { display: grid; gap: 2rem; margin-bottom: clamp(56px, 8vw, 96px); }
.footer-cta__title { font-size: var(--fs-mega); line-height: .9; letter-spacing: -.04em; }
.footer-cta__mail {
  display: inline-flex; align-items: center; gap: .8rem; width: fit-content;
  font: 400 clamp(1.3rem, 3vw, 2.2rem)/1.2 var(--font-serif); color: var(--ink);
  border-bottom: 1px solid var(--line-strong); padding-bottom: .3rem;
  transition: color .3s, border-color .3s; word-break: break-all;
}
.footer-cta__mail:hover { color: var(--signal-ink); border-color: var(--signal); }
.footer-meta { display: flex; flex-wrap: wrap; gap: 1rem 2rem; justify-content: space-between; align-items: center; }
.footer-links { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; }
.footer-links a { font-size: .92rem; color: var(--ink-2); }
.footer-links a:hover { color: var(--signal-ink); }

/* ---------- 10. Motion: reveal system ---------- */
/* core.js adds .js to <html>; without JS everything is visible. */
.js [data-reveal] {
  opacity: 0; transform: translateY(28px);
  transition: opacity var(--dur) var(--ease-out), transform var(--dur) var(--ease-out);
  transition-delay: calc(var(--d, 0) * 1ms);
}
.js [data-reveal="fade"] { transform: none; }
.js [data-reveal="scale"] { transform: scale(.96); }
.js [data-reveal="left"] { transform: translateX(-28px); }
.js [data-reveal].is-in { opacity: 1; transform: none; }

/* split-line headline reveal: wrap each line in <span class="line"><span>…</span></span> */
.line { display: block; overflow: hidden; padding-bottom: .08em; margin-bottom: -.08em; }
.line > span { display: inline-block; }
.js [data-lines] .line > span { transform: translateY(105%); transition: transform 1.1s var(--ease-out); transition-delay: calc(var(--i, 0) * 90ms + var(--d, 0) * 1ms); }
.js [data-lines].is-in .line > span { transform: none; }

/* scroll progress bar */
.progress { position: fixed; inset: 0 0 auto 0; height: 2px; z-index: 60; pointer-events: none; }
.progress__bar { height: 100%; background: var(--signal); transform-origin: left; transform: scaleX(var(--p, 0)); }

/* marquee */
.marquee { overflow: hidden; mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); }
.marquee__track { display: flex; width: max-content; gap: 3rem; animation: marquee var(--marquee-dur, 40s) linear infinite; }
.marquee:hover .marquee__track { animation-play-state: paused; }
@keyframes marquee { to { transform: translateX(-50%); } }

/* page enter */
.js body { animation: page-in .7s var(--ease-out) both; }
@keyframes page-in { from { opacity: 0; } to { opacity: 1; } }
.is-leaving body { opacity: 0; transition: opacity .25s ease; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; transition-delay: 0s !important; }
  .js [data-reveal], .js [data-lines] .line > span { opacity: 1; transform: none; }
  .compare__bar { transform: none; }
}

/* footer avatar — the ring reads as "available" */
.footer-cta__who { display: flex; align-items: center; gap: .9rem; }
.avatar {
  width: 52px; height: 52px; border-radius: 50%; object-fit: cover; flex: none;
  box-shadow: 0 0 0 3px var(--paper), 0 0 0 4px var(--signal);
}