/* ============================================================
   KST — shared styles (index / privacy / terms)
   design tokens kept intentionally minimal
   ============================================================ */
:root {
  /* color — single emerald as the only chromatic event */
  --primary: #3ecf8e;
  --primary-deep: #24b47e;
  --ink: #171717;
  --ink-mute: #707070;
  --ink-faint: #b2b2b2;
  --canvas: #ffffff;
  --canvas-soft: #fafafa;
  --canvas-night: #1c1c1c;
  --hairline: #dfdfdf;
  --hairline-cool: #ededed;

  /* type — ONE family, just a few sizes */
  --font: "Google Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-code:
    "Google Sans Code", ui-monospace, Menlo, Monaco, Consolas, monospace;

  --fs-display: clamp(36px, 6vw, 64px); /* hero */
  --fs-title: clamp(28px, 4vw, 40px); /* section openers */
  --fs-card: 20px; /* card titles */
  --fs-body: 16px; /* everything else */
  --fs-small: 13px; /* captions, footer */

  /* spacing — base 8, four steps only */
  --s1: 8px;
  --s2: 16px;
  --s3: 32px;
  --s4: 64px;

  --radius-btn: 6px;
  --radius-card: 12px;
  --container: 1180px;
  --shadow-float: 0 8px 24px rgba(0, 0, 0, 0.08);
}

/* legal pages (privacy / terms) — narrower reading column */
body.legal {
  --container: 820px;
  line-height: 1.6;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  font-size: var(--fs-body);
  font-weight: 400;
  line-height: 1.55;
  color: var(--ink);
  background: var(--canvas);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding-left: var(--s3);
  padding-right: var(--s3);
}

strong,
b {
  font-weight: 700;
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 500;
  line-height: 1;
  padding: 11px 18px;
  border-radius: var(--radius-btn);
  border: 1px solid transparent;
  cursor: pointer;
  transition:
    background 0.15s ease,
    border-color 0.15s ease,
    color 0.15s ease;
}
.btn-primary {
  background: var(--primary);
  color: var(--ink); /* near-black on green — brand idiosyncrasy */
  font-weight: 700;
}
.btn-primary:hover {
  background: var(--primary-deep);
}
.btn-outline {
  background: var(--canvas);
  color: var(--ink);
  border-color: var(--hairline);
}
.btn-outline:hover {
  border-color: var(--ink);
}

/* ============================================================
   NAV
   ============================================================ */
header.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--hairline-cool);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.logo {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.5px;
}
.logo .dot {
  color: var(--primary);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--s3);
}
.nav-links a.link {
  font-size: 15px;
  color: var(--ink-mute);
  transition: color 0.15s ease;
}
.nav-links a.link:hover {
  color: var(--ink);
}
.nav-cta {
  display: flex;
  align-items: center;
  gap: var(--s2);
}

.nav-toggle {
  display: none;
  background: none;
  border: 0;
  cursor: pointer;
  width: 40px;
  height: 40px;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
}
.nav-toggle span {
  display: block;
  height: 2px;
  width: 22px;
  background: var(--ink);
  border-radius: 2px;
  transition: 0.2s ease;
}

/* "← Back to home" link on legal pages */
.back {
  font-size: 14px;
  color: var(--ink-mute);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color 0.15s ease;
}
.back:hover {
  color: var(--ink);
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  padding: var(--s4) 0;
  text-align: center;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-small);
  color: var(--ink-mute);
  border: 1px solid var(--hairline);
  border-radius: 9999px;
  padding: 5px 14px;
  margin-bottom: var(--s3);
}
.eyebrow .pulse {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--primary);
}
.hero h1 {
  font-size: var(--fs-display);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 0 auto var(--s2);
}
.hero h1 .accent {
  color: var(--primary);
}
.hero p.lead {
  font-size: 18px;
  color: var(--ink-mute);
  max-width: 60ch;
  margin: 0 auto var(--s3);
}
.hero p.lead strong {
  color: var(--ink);
}
.hero-actions {
  display: flex;
  gap: var(--s2);
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- composited product UI mockup ---------- */
.mockup {
  margin: var(--s4) auto 0;
  max-width: 980px;
  background: var(--canvas-night);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-float);
  overflow: hidden;
  text-align: left;
}
.mockup-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 12px 16px;
  border-bottom: 1px solid #2a2a2a;
}
.mockup-bar .dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: #3a3a3a;
}
.mockup-bar .title {
  margin-left: 12px;
  color: #9a9a9a;
  font-family: var(--font-code);
  font-size: 12px;
}
.mockup-body {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 1px;
  background: #2a2a2a;
}
.mockup-pane {
  background: var(--canvas-night);
  padding: 22px;
}
.code-line {
  font-family: var(--font-code);
  font-size: 13px;
  line-height: 1.9;
  color: #cfcfcf;
}
.code-line .kw {
  color: var(--primary);
}
.code-line .str {
  color: #8fcaff;
}
.code-line .mut {
  color: #6b6b6b;
}
.metric-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 10px 0;
  border-bottom: 1px solid #2a2a2a;
}
.metric-row:last-child {
  border-bottom: 0;
}
.metric-row .k {
  color: #9a9a9a;
  font-size: 13px;
}
.metric-row .v {
  color: #fff;
  font-weight: 500;
  font-family: var(--font-code);
  font-size: 14px;
}
.metric-row .v.up {
  color: var(--primary);
}

/* ============================================================
   SECTIONS
   ============================================================ */
section {
  padding: var(--s4) 0;
}
section.soft {
  background: var(--canvas-soft);
  border-top: 1px solid var(--hairline-cool);
  border-bottom: 1px solid var(--hairline-cool);
}

.section-head {
  max-width: 60ch;
  margin-bottom: var(--s4);
}
.section-head.center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}
.kicker {
  font-size: var(--fs-small);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--primary-deep);
  margin-bottom: var(--s1);
}
section h2 {
  font-size: var(--fs-title);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: var(--s2);
}
.section-head p {
  color: var(--ink-mute);
  font-size: 18px;
}

/* ---------- cards grid ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s2);
}
.card {
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-card);
  padding: var(--s3);
  transition:
    border-color 0.15s ease,
    box-shadow 0.15s ease,
    transform 0.15s ease;
}
.card:hover {
  border-color: var(--hairline);
  box-shadow: var(--shadow-float);
  transform: translateY(-2px);
}
.card .icon {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  background: rgba(62, 207, 142, 0.12);
  margin-bottom: var(--s2);
}
.card .icon svg {
  width: 20px;
  height: 20px;
  stroke: var(--primary-deep);
}
.card h3 {
  font-size: var(--fs-card);
  font-weight: 700;
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}
.card p {
  color: var(--ink-mute);
  font-size: 15px;
  line-height: 1.5;
}

/* ---------- approach list (About) ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--s4);
  align-items: start;
}
.checklist {
  list-style: none;
  display: grid;
  gap: var(--s2);
}
.checklist li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
.checklist .tick {
  flex: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 1px;
}
.checklist .tick svg {
  width: 13px;
  height: 13px;
  stroke: var(--ink);
  stroke-width: 3;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.checklist li strong {
  font-weight: 700;
}
.checklist li span.desc {
  color: var(--ink-mute);
  font-size: 15px;
  display: block;
}

.panel {
  background: var(--canvas-night);
  color: #fff;
  border-radius: var(--radius-card);
  padding: var(--s3);
}
.panel h3 {
  font-size: var(--fs-card);
  font-weight: 700;
  margin-bottom: var(--s1);
}
.panel p {
  color: #b2b2b2;
  font-size: 15px;
  margin-bottom: var(--s2);
}
.panel p:last-child {
  margin-bottom: 0;
}
.panel .note {
  margin-top: var(--s2);
  padding-top: var(--s2);
  border-top: 1px solid #2a2a2a;
  font-size: 13px;
  color: #707070;
}

/* ---------- contact ---------- */
.contact-box {
  text-align: center;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-card);
  padding: var(--s4) var(--s3);
  background: var(--canvas);
}
.contact-box .email {
  display: inline-block;
  font-size: clamp(22px, 4vw, 32px);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: var(--s2) 0 var(--s3);
  color: var(--ink);
}
.contact-box .email:hover {
  color: var(--primary-deep);
}

/* ============================================================
   LEGAL DOCUMENT (privacy / terms)
   ============================================================ */
.doc {
  padding: var(--s4) 0;
}
.doc h1 {
  font-size: clamp(32px, 5vw, 44px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: var(--s1);
}
.doc .updated {
  color: var(--ink-faint);
  font-size: 14px;
  margin-bottom: var(--s4);
}
.doc h2 {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: var(--s3) 0 var(--s1);
}
.doc p {
  color: var(--ink-mute);
  margin-bottom: var(--s2);
}
.doc p strong,
.doc li strong {
  color: var(--ink);
  font-weight: 700;
}
.doc ul {
  margin: 0 0 var(--s2) var(--s2);
  padding-left: var(--s2);
}
.doc li {
  color: var(--ink-mute);
  margin-bottom: 6px;
}
.doc a.inline {
  color: var(--ink);
  text-decoration: underline;
}
.doc a.inline:hover {
  color: var(--primary-deep);
}

/* ============================================================
   FOOTER  (small, low-key text links)
   ============================================================ */
footer {
  border-top: 1px solid var(--hairline-cool);
  padding: var(--s4) 0 var(--s3);
  font-size: var(--fs-small);
  color: var(--ink-mute);
}
.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--s2);
  padding-bottom: var(--s3);
  border-bottom: 1px solid var(--hairline-cool);
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s3);
}
.footer-links a:hover {
  color: var(--ink);
}
.footer-bottom {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 6px;
  padding-top: var(--s3);
}
.footer-bottom .legal {
  color: var(--ink-faint);
}
.footer-bottom a {
  color: var(--ink-mute);
  text-decoration: underline;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
  .grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .split {
    grid-template-columns: 1fr;
    gap: var(--s3);
  }
  .mockup-body {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 720px) {
  .container {
    padding-left: var(--s2);
    padding-right: var(--s2);
  }
  section {
    padding: var(--s3) 0;
  }
  .hero {
    padding: var(--s3) 0;
  }
  .hero h1 {
    max-width: 14ch;
  }
  .doc {
    padding: var(--s3) 0;
  }
  .nav-links {
    display: none;
  }
  .nav-toggle {
    display: flex;
  }

  /* mobile menu */
  .nav-links.open {
    display: flex;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--s2);
    background: var(--canvas);
    border-bottom: 1px solid var(--hairline);
    padding: var(--s2) var(--s3) var(--s3);
  }
  .nav-links.open .nav-cta {
    width: 100%;
  }
  .nav-links.open .btn {
    width: 100%;
  }
}
@media (max-width: 540px) {
  .grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    flex-direction: column;
    align-items: flex-start;
  }
}