/* CallViva — "clinical editorial" design system.
   Chart paper, ink navy, scrub green, one coral pulse. Shared by the
   marketing pages and the student app (app/app.css builds on these tokens). */

:root {
  --paper: #f6f3ec;
  --paper-2: #efeadf;
  --card: #fffdf8;
  --ink: #0e1b2b;
  --ink-2: #34445a;
  --ink-3: #6b7788;
  --rule: #d9d2c3;
  --grid: rgba(14, 27, 43, 0.045);
  --scrub: #0f6b63;
  --scrub-deep: #0a4c46;
  --scrub-pale: #d9ebe6;
  --pulse: #e4572e;
  --pulse-pale: #fbe3da;
  --amber: #c98a16;

  --serif: "Instrument Serif", "Times New Roman", serif;
  --sans: "Space Grotesk", "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, Menlo, monospace;

  --radius: 4px;
  --max: 1180px;
  --gutter: clamp(16px, 4vw, 40px);
}

*, *::before, *::after { box-sizing: border-box; }
/* Component display rules (e.g. .form { display: grid }) must not un-hide [hidden]. */
[hidden] { display: none !important; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background-color: var(--paper);
  /* chart-paper grid */
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 24px 24px;
  color: var(--ink);
  font: 400 17px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; }
::selection { background: var(--scrub); color: var(--paper); }
:focus-visible { outline: 2px solid var(--pulse); outline-offset: 3px; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }
.label {
  font: 500 12px/1.4 var(--mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--scrub);
}
.label::before { content: "— "; color: var(--pulse); }
.serif { font-family: var(--serif); font-weight: 400; }
em.accent { font-style: italic; color: var(--scrub); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 15px 24px;
  border: 1.5px solid var(--ink);
  border-radius: var(--radius);
  background: var(--ink); color: var(--paper);
  font: 600 15px/1 var(--sans); letter-spacing: 0.01em;
  text-decoration: none; cursor: pointer;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
  box-shadow: 4px 4px 0 var(--pulse);
}
.btn:hover { transform: translate(-2px, -2px); box-shadow: 6px 6px 0 var(--pulse); }
.btn:active { transform: translate(2px, 2px); box-shadow: 1px 1px 0 var(--pulse); }
.btn--ghost { background: transparent; color: var(--ink); box-shadow: none; }
.btn--ghost:hover { background: var(--ink); color: var(--paper); box-shadow: none; transform: none; }
.btn--scrub { background: var(--scrub); border-color: var(--scrub); }
.btn[disabled] { opacity: .45; cursor: not-allowed; transform: none; box-shadow: none; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 20;
  background: rgba(246, 243, 236, 0.88);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; font: 700 19px/1 var(--sans); letter-spacing: -0.02em; }
.logo svg { width: 30px; height: 30px; }
.nav { display: flex; align-items: center; gap: 28px; font-size: 14px; font-weight: 500; }
.nav a { text-decoration: none; color: var(--ink-2); }
.nav a:hover { color: var(--ink); }
.nav .btn { padding: 11px 16px; font-size: 14px; color: var(--paper); box-shadow: 3px 3px 0 var(--pulse); }
@media (max-width: 760px) { .nav a:not(.btn) { display: none; } }

/* ---------- hero ---------- */
.hero { padding: clamp(48px, 8vw, 96px) 0 clamp(56px, 8vw, 110px); position: relative; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.08fr 0.92fr; gap: clamp(32px, 5vw, 72px); align-items: center; }
@media (max-width: 920px) { .hero-grid { grid-template-columns: 1fr; } }
.hero h1 {
  font: 400 clamp(46px, 7.4vw, 96px)/0.95 var(--serif);
  letter-spacing: -0.02em;
  margin: 18px 0 26px;
}
.hero h1 em { color: var(--scrub); }
.hero h1 .strike { position: relative; white-space: nowrap; }
.hero h1 .strike::after {
  content: ""; position: absolute; left: -2%; right: -2%; top: 55%;
  height: 0.09em; background: var(--pulse); transform: rotate(-2deg) scaleX(0);
  transform-origin: left; animation: strike .6s .9s cubic-bezier(.7,0,.3,1) forwards;
}
@keyframes strike { to { transform: rotate(-2deg) scaleX(1); } }
.hero .lede { font-size: clamp(17px, 1.6vw, 20px); color: var(--ink-2); max-width: 36ch; margin: 0 0 34px; }
.hero-cta { display: flex; flex-wrap: wrap; align-items: center; gap: 18px; }
.hero-note { font: 500 12px/1.5 var(--mono); color: var(--ink-3); letter-spacing: 0.04em; }

/* staggered load */
.rise { opacity: 0; transform: translateY(18px); animation: rise .8s cubic-bezier(.2,.7,.2,1) forwards; }
.d1 { animation-delay: .05s; } .d2 { animation-delay: .18s; } .d3 { animation-delay: .32s; }
.d4 { animation-delay: .46s; } .d5 { animation-delay: .6s; }
@keyframes rise { to { opacity: 1; transform: none; } }

/* hero call card */
.call-card {
  position: relative;
  background: var(--ink); color: var(--paper);
  border-radius: 6px;
  padding: 26px 26px 22px;
  box-shadow: 18px 18px 0 var(--scrub-pale), 18px 18px 0 1.5px var(--ink);
}
.call-card .call-top { display: flex; justify-content: space-between; align-items: center; font: 500 12px/1 var(--mono); letter-spacing: .1em; color: #9fb2c6; }
.live-dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--pulse); margin-right: 8px; animation: blink 1.4s infinite; }
@keyframes blink { 50% { opacity: .25; } }
.ecg { margin: 22px 0 18px; height: 70px; }
.ecg path { fill: none; stroke: var(--pulse); stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round;
  stroke-dasharray: 900; stroke-dashoffset: 900; animation: trace 2.8s linear infinite; }
@keyframes trace { to { stroke-dashoffset: 0; } }
.bubble { font-size: 15px; line-height: 1.5; padding: 12px 14px; border-radius: 4px; margin-top: 10px; max-width: 92%; }
.bubble b { display: block; font: 500 10.5px/1 var(--mono); letter-spacing: .12em; margin-bottom: 6px; }
.bubble--ai { background: rgba(255,255,255,.06); border-left: 2px solid var(--pulse); }
.bubble--ai b { color: var(--pulse); }
.bubble--me { background: var(--scrub); margin-left: auto; }
.bubble--me b { color: #bfe3dc; }
.score-chip {
  position: absolute; right: -18px; bottom: -34px;
  background: var(--card); color: var(--ink);
  border: 1.5px solid var(--ink); border-radius: 4px;
  padding: 12px 16px; transform: rotate(3deg);
  font: 500 12px/1.4 var(--mono);
  box-shadow: 4px 4px 0 var(--pulse);
}
.score-chip strong { display: block; font: 400 30px/1 var(--serif); margin-top: 2px; }
@media (max-width: 520px) { .score-chip { right: 8px; } .call-card { box-shadow: 10px 10px 0 var(--scrub-pale), 10px 10px 0 1.5px var(--ink); } }

/* ---------- sections ---------- */
section { position: relative; }
.section { padding: clamp(64px, 9vw, 120px) 0; border-top: 1px solid var(--rule); }
.section h2 { font: 400 clamp(36px, 5vw, 62px)/1 var(--serif); letter-spacing: -0.015em; margin: 14px 0 20px; max-width: 18ch; }
.section .sub { color: var(--ink-2); max-width: 56ch; margin: 0 0 48px; font-size: 18px; }

/* steps */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1.5px solid var(--ink); }
@media (max-width: 820px) { .steps { grid-template-columns: 1fr; } }
.step { padding: 30px 28px 34px 0; border-right: 1px solid var(--rule); }
.step + .step { padding-left: 28px; }
.step:last-child { border-right: 0; }
@media (max-width: 820px) { .step, .step + .step { padding: 26px 0; border-right: 0; border-bottom: 1px solid var(--rule); } }
.step .n { font: 400 64px/1 var(--serif); color: var(--pulse); }
.step h3 { font: 600 21px/1.25 var(--sans); margin: 16px 0 10px; letter-spacing: -0.01em; }
.step p { margin: 0; color: var(--ink-2); font-size: 16px; }

/* formats */
.formats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; border: 1.5px solid var(--ink); background: var(--card); }
@media (max-width: 820px) { .formats { grid-template-columns: 1fr; } }
.format { padding: 30px 28px; border-right: 1px solid var(--rule); display: flex; flex-direction: column; gap: 10px; transition: background .2s; }
.format:last-child { border-right: 0; }
@media (max-width: 820px) { .format { border-right: 0; border-bottom: 1px solid var(--rule); } .format:last-child { border-bottom: 0; } }
.format:hover { background: var(--scrub-pale); }
.format .mins { font: 500 12px/1 var(--mono); letter-spacing: .12em; color: var(--ink-3); }
.format h3 { font: 400 34px/1.05 var(--serif); margin: 4px 0 4px; }
.format p { margin: 0; color: var(--ink-2); font-size: 15.5px; }
.format ul { margin: 8px 0 0; padding: 0; list-style: none; font-size: 14.5px; color: var(--ink-2); }
.format li { padding: 7px 0; border-top: 1px dashed var(--rule); }
.format li::before { content: "+ "; color: var(--scrub); font-family: var(--mono); }

/* sample report */
.report-demo { display: grid; grid-template-columns: 0.85fr 1.15fr; gap: clamp(28px, 5vw, 64px); align-items: start; }
@media (max-width: 920px) { .report-demo { grid-template-columns: 1fr; } }
.sheet {
  background: var(--card); border: 1.5px solid var(--ink); border-radius: 3px;
  padding: 28px clamp(18px, 3vw, 34px) 30px; position: relative;
  box-shadow: 10px 10px 0 var(--ink);
}
.sheet-head { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; border-bottom: 1.5px solid var(--ink); padding-bottom: 14px; margin-bottom: 18px; }
.sheet-head .t { font: 400 28px/1.1 var(--serif); }
.stamp {
  font: 600 11px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase;
  color: var(--pulse); border: 1.5px solid var(--pulse); padding: 7px 9px; transform: rotate(-4deg); align-self: flex-start;
}
.bars { display: grid; gap: 10px; margin: 6px 0 22px; }
.bar { display: grid; grid-template-columns: minmax(120px, 1fr) 1.3fr 26px; gap: 12px; align-items: center; font-size: 14px; }
.bar .track { height: 8px; background: var(--paper-2); border-radius: 2px; overflow: hidden; }
.bar .fill { display: block; height: 100%; background: var(--scrub); width: 0; transition: width 1.2s cubic-bezier(.2,.7,.2,1); }
.bar .fill.low { background: var(--amber); }
.bar .v { font: 600 13px/1 var(--mono); text-align: right; }
.in .bar .fill { width: var(--w); }
.note { border-left: 3px solid var(--scrub); padding: 4px 0 4px 14px; margin: 16px 0; font-size: 15px; }
.note.fix { border-color: var(--pulse); }
.note b { display: block; font: 600 11px/1.2 var(--mono); letter-spacing: .12em; text-transform: uppercase; margin-bottom: 4px; color: var(--scrub); }
.note.fix b { color: var(--pulse); }
.note q { font-family: var(--serif); font-size: 18px; font-style: italic; quotes: "“" "”"; }
.rewrite { background: var(--scrub-pale); padding: 12px 14px; margin-top: 8px; font-size: 14.5px; border-radius: 3px; }
.todo { counter-reset: t; list-style: none; padding: 0; margin: 10px 0 0; }
.todo li { counter-increment: t; display: grid; grid-template-columns: 30px 1fr; gap: 8px; padding: 10px 0; border-top: 1px dashed var(--rule); font-size: 15px; }
.todo li::before { content: counter(t, decimal-leading-zero); font: 600 13px/1.6 var(--mono); color: var(--pulse); }
.side-points { display: grid; gap: 26px; }
.side-points div { border-top: 1.5px solid var(--ink); padding-top: 14px; }
.side-points h3 { font: 600 19px/1.3 var(--sans); margin: 0 0 6px; }
.side-points p { margin: 0; color: var(--ink-2); font-size: 16px; }
.fine { font: 400 12.5px/1.5 var(--mono); color: var(--ink-3); margin-top: 18px; }

/* why voice */
.why { background: var(--ink); color: var(--paper); border-top: 0; }
.why .label { color: #8fd3c7; }
.why h2 em { color: #8fd3c7; }
.why .sub { color: #b9c4d2; }
.why-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: #26374c; border: 1px solid #26374c; }
@media (max-width: 760px) { .why-grid { grid-template-columns: 1fr; } }
.why-grid div { background: var(--ink); padding: 30px 28px; }
.why-grid h3 { font: 400 28px/1.15 var(--serif); margin: 0 0 10px; }
.why-grid p { margin: 0; color: #b9c4d2; font-size: 16px; }

/* pricing */
.plans { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 24px; align-items: stretch; }
@media (max-width: 520px) { .plans { grid-template-columns: 1fr; } }
.plan { background: var(--card); border: 1.5px solid var(--ink); border-radius: 4px; padding: 30px 28px; display: flex; flex-direction: column; }
.plan.featured { background: var(--scrub); color: var(--paper); box-shadow: 10px 10px 0 var(--ink); }
.plan .pname { font: 500 12px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; }
.plan .price { font: 400 clamp(40px, 4.2vw, 58px)/1 var(--serif); margin: 18px 0 4px; }
.plan .per { font-size: 14px; opacity: .8; margin-bottom: 20px; }
.plan ul { list-style: none; padding: 0; margin: 0 0 26px; font-size: 15px; flex: 1; }
.plan li { padding: 8px 0; border-top: 1px solid rgba(14,27,43,.12); }
.plan.featured li { border-color: rgba(255,255,255,.2); }
.plan .btn { justify-content: center; }
.plan.featured .btn { background: var(--paper); color: var(--ink); border-color: var(--paper); box-shadow: 4px 4px 0 var(--pulse); }

/* faq */
.faq { max-width: 820px; }
.faq details { border-top: 1px solid var(--rule); padding: 20px 0; }
.faq details:last-child { border-bottom: 1px solid var(--rule); }
.faq summary { cursor: pointer; list-style: none; display: flex; justify-content: space-between; gap: 16px; font: 500 19px/1.35 var(--sans); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font: 400 28px/0.8 var(--serif); color: var(--pulse); transition: transform .2s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq p { color: var(--ink-2); margin: 12px 0 0; max-width: 68ch; }

/* final cta */
.final { text-align: left; padding: clamp(72px, 10vw, 130px) 0; border-top: 1.5px solid var(--ink); }
.final h2 { font: 400 clamp(44px, 7vw, 92px)/0.95 var(--serif); margin: 0 0 30px; max-width: 14ch; }

/* footer */
.site-footer { border-top: 1px solid var(--rule); padding: 36px 0 48px; font-size: 14px; color: var(--ink-3); }
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 18px 36px; justify-content: space-between; }
.site-footer a { color: var(--ink-2); }
.site-footer .disclaimer { flex-basis: 100%; font: 400 12px/1.6 var(--mono); max-width: 90ch; }

/* reveal on scroll */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s ease, transform .7s cubic-bezier(.2,.7,.2,1); }
.reveal.in { opacity: 1; transform: none; }

/* legal pages */
.legal { max-width: 760px; padding: 56px 0 90px; }
.legal h1 { font: 400 clamp(40px, 6vw, 64px)/1 var(--serif); margin: 12px 0 8px; }
.legal h2 { font: 600 20px/1.3 var(--sans); margin: 36px 0 8px; }
.legal p, .legal li { color: var(--ink-2); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .rise, .reveal { opacity: 1; transform: none; }
  .ecg path { stroke-dashoffset: 0; }
  .hero h1 .strike::after { transform: rotate(-2deg) scaleX(1); }
}