/* =========================================================================
   iMDM27+ — One UI 7 inspired stylesheet
   ========================================================================= */
:root {
  --bg: #F5F6F8;
  --card: #FFFFFF;
  --text: #111827;
  --text-2: #6B7280;
  --border: #E5E7EB;
  --field: #F2F4F7;
  --blue: #0A84FF;
  --blue-2: #5EA8FF;
  --blue-tint: #EAF3FF;
  --green: #22C55E;
  --yellow: #FBBF24;
  --red: #EF4444;
  --radius: 24px;
  --radius-sm: 16px;
  --shadow: 0 2px 8px rgba(0,0,0,.04), 0 8px 24px rgba(0,0,0,.06);
  --shadow-hover: 0 4px 14px rgba(0,0,0,.06), 0 16px 36px rgba(0,0,0,.09);
  --ease: cubic-bezier(.2,.8,.2,1);
  --dur: .25s;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, "SamsungOne", "SF Pro Display", Roboto, "Segoe UI", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.wrap { width: min(1120px, 92vw); margin-inline: auto; }

h1, h2, h3 { line-height: 1.25; margin: 0 0 .4em; font-weight: 700; letter-spacing: -.01em; }
h1 { font-size: clamp(30px, 4.4vw, 40px); }
h2 { font-size: clamp(22px, 2.6vw, 28px); }
h3 { font-size: 18px; }
p { margin: 0 0 1em; }
.muted { color: var(--text-2); font-size: 15px; }
.plus { color: var(--blue); }

/* ------------------------------- Header ------------------------------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(1.4) blur(14px);
  background: rgba(245,246,248,.82);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.site-header.scrolled { border-bottom-color: var(--border); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }

.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: inherit; }
.brand-mark {
  width: 42px; height: 42px; border-radius: 50%;
  display: grid; place-items: center; color: #fff;
  font-size: 24px; font-weight: 700;
  background: linear-gradient(135deg, var(--blue), var(--blue-2));
  box-shadow: 0 6px 18px rgba(10,132,255,.35);
}
.brand-name { font-size: 22px; font-weight: 700; }

.nav { display: flex; align-items: center; gap: 8px; }
.nav a {
  color: var(--text-2); text-decoration: none; font-weight: 500; font-size: 15px;
  padding: 8px 12px; border-radius: 12px;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}
.nav a:hover { background: var(--blue-tint); color: var(--blue); }

.pill {
  display: inline-flex; align-items: center; gap: 7px;
  height: 40px; padding: 0 15px; border-radius: 14px; cursor: pointer;
  border: 0; font: inherit; font-weight: 700; font-size: 14px;
  color: var(--blue); background: var(--blue-tint);
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.pill:hover { background: #DCEBFF; }
.pill:active { transform: scale(.97); }
.ico { width: 17px; height: 17px; }

/* -------------------------------- Buttons ----------------------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  min-height: 52px; padding: 0 22px; border-radius: 18px; cursor: pointer;
  font: inherit; font-weight: 600; font-size: 16px; text-decoration: none;
  border: 0; color: #fff;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.btn.primary { background: linear-gradient(135deg, var(--blue), var(--blue-2)); box-shadow: 0 8px 22px rgba(10,132,255,.28); }
.btn.primary:hover { box-shadow: 0 12px 28px rgba(10,132,255,.36); }
.btn.ghost { background: #fff; color: var(--text); box-shadow: var(--shadow); }
.btn:active { transform: scale(.97); }
.btn.wide { width: 100%; margin-top: 6px; }
.btn:disabled { opacity: .55; cursor: default; box-shadow: none; }

/* -------------------------------- Cards ------------------------------- */
.card {
  background: var(--card); border-radius: var(--radius); padding: 26px;
  box-shadow: var(--shadow);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.card:hover { transform: translateY(-2px); box-shadow: var(--shadow-hover); }

.section { padding: 28px 0; }
.section-title { text-align: center; margin-bottom: 22px; }

/* --------------------------------- Hero ------------------------------- */
.hero {
  display: grid; grid-template-columns: 1.25fr .9fr; gap: 28px; align-items: center;
  padding: 52px 0 34px;
}
.hero-text h1 { max-width: 20ch; }
.hero-text p { max-width: 52ch; color: var(--text-2); font-size: 17px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 22px; }
.hero-card { display: flex; flex-direction: column; gap: 20px; }
.hero-card:hover { transform: none; }
.badge {
  display: inline-flex; align-items: center; gap: 9px; align-self: flex-start;
  padding: 9px 14px; border-radius: 14px; font-size: 14px; font-weight: 600;
  background: #E9F9EF; color: #137a3c;
}
.dot { width: 9px; height: 9px; border-radius: 50%; background: var(--green); }
.badge.ok .dot { box-shadow: 0 0 0 4px rgba(34,197,94,.18); }
.hero-stat { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.hero-stat > div {
  background: var(--field); border-radius: var(--radius-sm); padding: 16px;
  display: flex; flex-direction: column; gap: 2px;
}
.hero-stat strong { font-size: 28px; }
.hero-stat span { color: var(--text-2); font-size: 13px; }

/* -------------------------------- Forms ------------------------------- */
.form-card { max-width: 620px; margin-inline: auto; }
.form-card:hover { transform: none; }
.field { display: flex; flex-direction: column; gap: 7px; margin-bottom: 16px; }
.field label { font-size: 14px; font-weight: 600; color: var(--text-2); }
.field input {
  height: 54px; padding: 0 16px; border-radius: var(--radius-sm);
  border: 1.5px solid transparent; background: var(--field);
  font: inherit; color: var(--text); outline: none;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
}
.field input::placeholder { color: #9aa3af; }
.field input:focus {
  background: #fff; border-color: var(--blue);
  box-shadow: 0 0 0 4px rgba(10,132,255,.14);
}
.field input.invalid { border-color: var(--red); box-shadow: 0 0 0 4px rgba(239,68,68,.12); }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }

/* -------------------------------- Result ------------------------------ */
.result {
  margin-top: 18px; padding: 18px; border-radius: var(--radius-sm);
  background: var(--field); font-size: 15px; animation: fadeUp .25s var(--ease);
}
.result.ok { background: #E9F9EF; }
.result.warn { background: #FFF6E5; }
.result.err { background: #FDECEC; }
.result h3 { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; }
.result .kv { display: grid; grid-template-columns: auto 1fr; gap: 4px 14px; margin-top: 8px; }
.result .kv dt { color: var(--text-2); }
.result .kv dd { margin: 0; font-family: ui-monospace, "SF Mono", Consolas, monospace; word-break: break-all; }
.result code { font-size: 13px; }

.trust { margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--border); }
.trust-row { display: flex; align-items: center; gap: 9px; font-size: 14px; }
.trust .dot { background: #C7CBD1; }
.trust.verified .dot { background: var(--green); box-shadow: 0 0 0 4px rgba(34,197,94,.18); }
.trust.failed .dot { background: var(--red); box-shadow: 0 0 0 4px rgba(239,68,68,.18); }
.fp { display: block; margin-top: 8px; font-size: 12px; color: var(--text-2); word-break: break-all; }

.spinner {
  width: 16px; height: 16px; border-radius: 50%; display: inline-block;
  border: 2px solid rgba(255,255,255,.5); border-top-color: #fff;
  animation: spin .7s linear infinite;
}

/* ------------------------------- Features ----------------------------- */
.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.feature { display: flex; flex-direction: column; gap: 6px; }
.feature-ico {
  width: 48px; height: 48px; border-radius: 15px; display: grid; place-items: center;
  background: var(--blue-tint); font-size: 22px; margin-bottom: 6px;
}
.feature p { color: var(--text-2); font-size: 15px; margin: 0; }

/* -------------------------------- Steps ------------------------------- */
.steps { list-style: none; margin: 0; padding: 12px 26px; }
.steps li { display: flex; gap: 16px; align-items: flex-start; padding: 16px 0; }
.steps li + li { border-top: 1px solid var(--border); }
.steps span {
  flex: 0 0 34px; height: 34px; border-radius: 50%; display: grid; place-items: center;
  background: var(--blue-tint); color: var(--blue); font-weight: 700;
}
.steps p { margin: 0; align-self: center; }

/* -------------------------------- Footer ------------------------------ */
.site-footer { margin-top: 40px; padding: 28px 0; border-top: 1px solid var(--border); }
.footer-inner { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; color: var(--text-2); font-size: 14px; }

/* ------------------------------ Animations ---------------------------- */
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes fadeUp { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* ------------------------------ Responsive ---------------------------- */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; padding-top: 34px; }
  .cards { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 620px) {
  .nav a { display: none; }
  .cards { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .form-card { padding: 22px 18px; }
  .hero-stat { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

/* ========================= Single-page (serial only) ===================== */
.center-page {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
.center-main {
  flex: 1;
  display: grid;
  place-items: center;
  padding: 40px 20px;
}
.form-card {
  width: min(560px, 92vw);
}
.form-title {
  font-size: clamp(26px, 4vw, 34px);
  margin-bottom: .3em;
}
.form-card .field { margin-top: 8px; }
.form-card .field input {
  height: 58px;
  font-size: 18px;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.hint {
  min-height: 18px;
  font-size: 13px;
  color: var(--text-2);
}
.hint.ok { color: #137a3c; }
.hint.bad { color: var(--red); }
.site-footer { margin-top: 0; }