/* IASTECHAI — shared styles */

:root {
  --navy: #1B2A44;
  --navy-deep: #0F1A2B;
  --orange: #F26522;
  --amber: #FBA919;
  --ink: #12161F;
  --paper: #F7F7F7;
  --white: #FFFFFF;
  --line: #E2E5EA;
  --line-dark: rgba(255,255,255,.14);
  --muted: #5A6577;
  --muted-dark: #A7B1C2;
  --grad: linear-gradient(100deg, var(--amber), var(--orange));

  --font-display: 'Sora', ui-sans-serif, system-ui, sans-serif;
  --font-body: 'Inter', ui-sans-serif, system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', monospace;

  --wrap: 1140px;
  --pad: 24px;
  --r: 14px;
  --r-lg: 22px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: inherit; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--navy);
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0 0 .5em;
  font-weight: 600;
}

h1 { font-size: clamp(2.1rem, 5.2vw, 3.5rem); letter-spacing: -0.035em; }
h2 { font-size: clamp(1.6rem, 3.4vw, 2.35rem); letter-spacing: -0.028em; }
h3 { font-size: 1.16rem; }

p { margin: 0 0 1.1em; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 var(--pad); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--orange);
  margin: 0 0 1rem;
  display: flex;
  align-items: center;
  gap: .7rem;
}
.eyebrow::before {
  content: "";
  width: 26px; height: 2px;
  background: var(--grad);
  flex: none;
}
.eyebrow--center { justify-content: center; }

.lede { font-size: 1.1rem; color: var(--muted); max-width: 62ch; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 60;
  background: rgba(247,247,247,.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; min-height: 74px;
}
.brand { display: flex; align-items: center; flex: none; }
.brand img { height: 38px; width: auto; }

.nav { display: flex; align-items: center; gap: 2px; }
.nav a {
  text-decoration: none;
  font-size: .93rem;
  font-weight: 500;
  color: var(--navy);
  padding: .55rem .85rem;
  border-radius: 8px;
  transition: background .18s ease, color .18s ease;
}
.nav a:hover { background: rgba(27,42,68,.07); }
.nav a.is-active { color: var(--orange); }

.nav-cta {
  margin-left: .6rem;
  background: var(--navy) !important;
  color: #fff !important;
  padding: .62rem 1.2rem !important;
  border-radius: 999px !important;
}
.nav-cta:hover { background: var(--orange) !important; }

.nav-toggle {
  display: none;
  background: none; border: 1px solid var(--line);
  border-radius: 10px;
  width: 44px; height: 42px;
  cursor: pointer;
  padding: 0;
  align-items: center; justify-content: center;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  display: block; width: 19px; height: 2px; background: var(--navy);
  border-radius: 2px; position: relative; transition: transform .22s ease, opacity .18s ease;
}
.nav-toggle span::before, .nav-toggle span::after { content: ""; position: absolute; left: 0; }
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after { top: 6px; }
.nav-open .nav-toggle span { background: transparent; }
.nav-open .nav-toggle span::before { transform: translateY(6px) rotate(45deg); }
.nav-open .nav-toggle span::after { transform: translateY(-6px) rotate(-45deg); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  font-family: var(--font-body);
  font-weight: 600; font-size: .97rem;
  text-decoration: none;
  padding: .85rem 1.6rem;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .16s ease, background .2s ease, color .2s ease, border-color .2s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--grad); color: #fff; }
.btn-outline { border-color: rgba(27,42,68,.25); color: var(--navy); background: transparent; }
.btn-outline:hover { border-color: var(--orange); color: var(--orange); }
.btn-ghost-light { border-color: var(--line-dark); color: #fff; background: transparent; }
.btn-ghost-light:hover { border-color: var(--amber); color: var(--amber); }
.btn-row { display: flex; flex-wrap: wrap; gap: .8rem; }

/* ---------- sections ---------- */
.section { padding: clamp(64px, 8vw, 108px) 0; }
.section--tight { padding: clamp(48px, 6vw, 76px) 0; }
.section--paper { background: var(--paper); }
.section--white { background: var(--white); }
.section--navy { background: var(--navy-deep); color: #D9E0EC; }
.section--navy h1, .section--navy h2, .section--navy h3, .section--navy h4 { color: #fff; }
.section--navy .lede { color: var(--muted-dark); }

.section-head { max-width: 68ch; margin-bottom: 2.6rem; }
.section-head--center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head--center .eyebrow { justify-content: center; }

/* ---------- hero ---------- */
.hero {
  background: var(--navy-deep);
  color: #D9E0EC;
  position: relative;
  overflow: hidden;
  padding: clamp(64px, 9vw, 112px) 0 clamp(64px, 9vw, 104px);
}
.hero::after {
  content: "";
  position: absolute; inset: 0;
  background:
    radial-gradient(760px 420px at 78% 12%, rgba(242,101,34,.20), transparent 62%),
    radial-gradient(560px 380px at 8% 92%, rgba(27,42,68,.85), transparent 60%);
  pointer-events: none;
}
.hero .wrap { position: relative; z-index: 2; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}
.hero h1 { color: #fff; }
.hero .lede { color: #B9C4D4; font-size: 1.13rem; }
.hero .eyebrow { color: var(--amber); }

/* phone signature */
.device-stage { display: flex; justify-content: center; align-items: center; }
.phone {
  width: 268px;
  aspect-ratio: 9 / 18.6;
  border-radius: 40px;
  background: linear-gradient(170deg, #24344F, #16233A);
  border: 1px solid rgba(255,255,255,.16);
  box-shadow: 0 40px 80px -30px rgba(0,0,0,.8), inset 0 1px 0 rgba(255,255,255,.1);
  padding: 11px;
  position: relative;
}
.phone::before {
  content: "";
  position: absolute; top: 20px; left: 50%; transform: translateX(-50%);
  width: 86px; height: 22px; border-radius: 999px;
  background: #0B121F; z-index: 3;
}
.phone-screen {
  height: 100%;
  border-radius: 30px;
  background: #0B121F;
  overflow: hidden;
  padding: 54px 18px 18px;
  display: flex; flex-direction: column; gap: 10px;
}
.build-row {
  display: flex; align-items: center; gap: 10px;
  padding: 11px 12px;
  border-radius: 12px;
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.07);
  font-family: var(--font-mono);
  font-size: .66rem;
  color: #C4CEDD;
  opacity: 0;
  transform: translateY(8px);
  animation: rowIn .5s ease forwards;
}
.build-row:nth-child(1) { animation-delay: .15s; }
.build-row:nth-child(2) { animation-delay: .45s; }
.build-row:nth-child(3) { animation-delay: .75s; }
.build-row:nth-child(4) { animation-delay: 1.05s; }
.build-row:nth-child(5) { animation-delay: 1.35s; }
.build-row .os { color: #7E8CA3; letter-spacing: .08em; }
.build-row .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--orange); flex: none;
  box-shadow: 0 0 0 3px rgba(242,101,34,.16);
}
.build-row.done .dot { background: #4ADE80; box-shadow: 0 0 0 3px rgba(74,222,128,.14); }
.phone-foot {
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: .6rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: #5E6C82;
  text-align: center;
}
@keyframes rowIn { to { opacity: 1; transform: none; } }

/* ---------- strip ---------- */
.strip {
  background: var(--navy);
  border-top: 1px solid rgba(255,255,255,.08);
}
.strip-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: rgba(255,255,255,.09);
}
.strip-item {
  background: var(--navy);
  padding: 1.5rem 1.2rem;
  text-align: center;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .06em;
  color: #C7D0DE;
}
.strip-item b { display: block; font-family: var(--font-display); font-size: 1rem; color: #fff; letter-spacing: -.01em; margin-bottom: .2rem; font-weight: 600; }

/* ---------- cards ---------- */
.grid { display: grid; gap: 1.3rem; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 1.9rem 1.7rem;
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 22px 44px -28px rgba(15,26,43,.4); border-color: rgba(242,101,34,.4); }
.card h3 { margin-bottom: .45rem; }
.card p { color: var(--muted); font-size: .96rem; margin-bottom: 0; }
.card .num {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .14em;
  color: var(--orange);
  display: block;
  margin-bottom: .9rem;
}
.card--flat:hover { transform: none; box-shadow: none; border-color: var(--line); }
.section--navy .card { background: rgba(255,255,255,.045); border-color: var(--line-dark); }
.section--navy .card p { color: var(--muted-dark); }

.covers {
  list-style: none;
  margin: 1.2rem 0 0;
  padding: 1.1rem 0 0;
  border-top: 1px dashed var(--line);
  display: flex; flex-wrap: wrap; gap: .4rem;
}
.covers li {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .04em;
  color: var(--navy);
  background: rgba(27,42,68,.06);
  padding: .3rem .6rem;
  border-radius: 6px;
}

/* ---------- decision block ---------- */
.decide {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--white);
}
.decide > div { padding: 2rem 1.8rem; }
.decide > div + div { border-left: 1px solid var(--line); }
.decide h3 { display: flex; align-items: center; gap: .6rem; }
.decide h3 span {
  font-family: var(--font-mono); font-size: .68rem; letter-spacing: .12em;
  padding: .22rem .5rem; border-radius: 5px;
  background: var(--grad); color: #fff;
}
.decide p { color: var(--muted); font-size: .96rem; }
.decide-note {
  margin-top: 1.4rem;
  padding: 1.1rem 1.4rem;
  border-radius: var(--r);
  background: var(--navy);
  color: #D9E0EC;
  font-size: .95rem;
}
.decide-note strong { color: #fff; }

/* ---------- process ---------- */
.stage {
  display: grid;
  grid-template-columns: 88px 1fr 220px;
  gap: 2rem;
  padding: 2.2rem 0;
  border-top: 1px solid var(--line);
  align-items: start;
}
.stage:last-of-type { border-bottom: 1px solid var(--line); }
.stage-num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 500;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stage h3 { margin-bottom: .6rem; }
.stage p { color: var(--muted); font-size: .98rem; }
.stage p:last-child { margin-bottom: 0; }
.stage-meta {
  font-family: var(--font-mono);
  font-size: .76rem;
  color: var(--muted);
  border-left: 2px solid var(--orange);
  padding-left: 1rem;
  line-height: 1.7;
}
.stage-meta b { display: block; color: var(--navy); font-family: var(--font-body); font-size: .82rem; margin-bottom: .2rem; }

/* ---------- process teaser ---------- */
.flow { display: flex; flex-wrap: wrap; gap: .6rem; align-items: center; }
.flow span {
  font-family: var(--font-mono);
  font-size: .8rem;
  padding: .55rem 1rem;
  border: 1px solid var(--line-dark);
  border-radius: 999px;
  color: #D9E0EC;
}
.flow i { color: var(--orange); font-style: normal; }

/* ---------- lists ---------- */
.checks { list-style: none; margin: 0; padding: 0; display: grid; gap: .9rem; }
.checks li { display: flex; gap: .8rem; align-items: flex-start; font-size: .98rem; color: var(--muted); }
.checks li::before {
  content: "";
  flex: none;
  width: 9px; height: 9px; margin-top: .5rem;
  border-radius: 2px;
  background: var(--grad);
}
.section--navy .checks li { color: var(--muted-dark); }

/* ---------- faq ---------- */
.faq { border-top: 1px solid var(--line); }
.faq details {
  border-bottom: 1px solid var(--line);
  padding: 1.15rem 0;
}
.faq summary {
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--navy);
  font-size: 1.02rem;
  list-style: none;
  display: flex; justify-content: space-between; gap: 1rem; align-items: center;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--orange); font-family: var(--font-mono); font-size: 1.2rem; }
.faq details[open] summary::after { content: "–"; }
.faq details p { margin: .8rem 0 0; color: var(--muted); font-size: .96rem; }

/* ---------- contact ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.15fr; gap: clamp(2rem, 4vw, 3.4rem); align-items: start; }
.info-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 1.3rem 1.4rem;
  margin-bottom: .9rem;
}
.info-card .label {
  font-family: var(--font-mono);
  font-size: .68rem; letter-spacing: .14em; text-transform: uppercase;
  color: var(--orange); margin-bottom: .35rem;
}
.info-card .value { font-weight: 600; color: var(--navy); font-size: 1.02rem; }
.info-card a { text-decoration: none; }
.info-card a:hover { color: var(--orange); }

.form-shell {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: clamp(1.6rem, 3vw, 2.4rem);
}
.field { margin-bottom: 1.05rem; }
.field label {
  display: block;
  font-family: var(--font-mono);
  font-size: .7rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--navy); margin-bottom: .45rem;
}
.field input, .field select, .field textarea {
  width: 100%;
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: .78rem .95rem;
  transition: border-color .18s ease, box-shadow .18s ease;
}
.field textarea { min-height: 148px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none;
  border-color: var(--orange);
  box-shadow: 0 0 0 3px rgba(242,101,34,.14);
}
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.hp { position: absolute; left: -9999px; opacity: 0; }
.form-note { font-size: .85rem; color: var(--muted); margin: 1rem 0 0; }
.form-msg {
  display: none;
  margin-bottom: 1.2rem;
  padding: .9rem 1.1rem;
  border-radius: 10px;
  font-size: .93rem;
}
.form-msg.ok { display: block; background: rgba(74,222,128,.12); border: 1px solid rgba(34,150,80,.35); color: #1B6B3A; }
.form-msg.err { display: block; background: rgba(242,101,34,.1); border: 1px solid rgba(242,101,34,.4); color: #B33F0C; }

/* ---------- cta ---------- */
.cta-band {
  background: var(--navy-deep);
  color: #D9E0EC;
  position: relative;
  overflow: hidden;
}
.cta-band::after {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(620px 300px at 82% 40%, rgba(251,169,25,.16), transparent 65%);
  pointer-events: none;
}
.cta-band .wrap { position: relative; z-index: 2; }
.cta-band h2 { color: #fff; }
.cta-inner { display: flex; flex-wrap: wrap; gap: 2rem; align-items: center; justify-content: space-between; }
.cta-inner .lede { color: var(--muted-dark); margin-bottom: 0; }
.cta-copy { max-width: 60ch; }

/* ---------- footer ---------- */
.site-footer {
  background: var(--navy);
  color: var(--muted-dark);
  padding: 3.4rem 0 1.8rem;
  font-size: .93rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.2fr;
  gap: 2.4rem;
  padding-bottom: 2.2rem;
  border-bottom: 1px solid var(--line-dark);
}
.site-footer img { height: 34px; margin-bottom: 1rem; }
.site-footer h4 {
  font-family: var(--font-mono);
  font-size: .7rem; letter-spacing: .16em; text-transform: uppercase;
  color: #fff; margin: 0 0 1rem;
  font-weight: 500;
}
.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: .55rem; }
.site-footer a { text-decoration: none; }
.site-footer a:hover { color: var(--amber); }
.footer-bottom {
  padding-top: 1.4rem;
  display: flex; flex-wrap: wrap; gap: .6rem; justify-content: space-between;
  font-size: .84rem;
  font-family: var(--font-mono);
  color: #8C99AC;
}

/* ---------- reveal ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- responsive ---------- */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; }
  .device-stage { order: -1; }
  .phone { width: 232px; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .stage { grid-template-columns: 60px 1fr; }
  .stage-meta { grid-column: 2; border-left: none; border-top: 1px solid var(--line); padding: .9rem 0 0; }
}

@media (max-width: 760px) {
  body { font-size: 16px; }
  .nav-toggle { display: inline-flex; }
  .nav {
    position: fixed;
    inset: 74px 0 auto;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: stretch;
    padding: 1rem var(--pad) 1.6rem;
    gap: .2rem;
    display: none;
  }
  .nav-open .nav { display: flex; }
  .nav a { padding: .85rem .4rem; font-size: 1.02rem; }
  .nav-cta { margin: .6rem 0 0; text-align: center; justify-content: center; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .decide { grid-template-columns: 1fr; }
  .decide > div + div { border-left: none; border-top: 1px solid var(--line); }
  .strip-inner { grid-template-columns: repeat(2, 1fr); }
  .field-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 1.8rem; }
  .stage { grid-template-columns: 1fr; gap: .8rem; }
  .stage-meta { grid-column: 1; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .001ms !important; transition-duration: .001ms !important; }
  .reveal { opacity: 1; transform: none; }
  .build-row { opacity: 1; transform: none; }
}

:focus-visible { outline: 3px solid var(--orange); outline-offset: 2px; border-radius: 4px; }