/* ============================================================
   StructAlert — DKM Consult Limited (Hong Kong)
   Palette derived from the DKM brand:
   Blue #00529F · Amber #EB9419 · Sage #7D8667 · Dark #231F20
   ============================================================ */

:root {
  --blue: #00529F;
  --blue-dark: #003B73;
  --blue-ink: #002B55;
  --blue-soft: #E8F1F9;
  --amber: #EB9419;
  --amber-dark: #C97B0B;
  --amber-soft: #FDF3E3;
  --sage: #7D8667;
  --dark: #231F20;
  --muted: #5A6069;
  --line: #D9DCE0;
  --bg-soft: #F7F8FA;
  --white: #FFFFFF;
  --radius: 14px;
  --shadow: 0 8px 32px rgba(15, 23, 42, 0.07);
  --shadow-lg: 0 20px 45px -18px rgba(0, 43, 85, 0.28);
  --font: Inter, "Segoe UI", system-ui, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--dark);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--blue); color: var(--white); padding: 10px 16px; z-index: 100;
  border-radius: 0 0 10px 0;
}
.skip-link:focus { left: 0; color: var(--white); text-decoration: none; }

/* ---------- Buttons & chips ---------- */

.btn {
  display: inline-block; padding: 12px 22px; border-radius: 999px;
  font-weight: 700; font-size: 0.95rem; border: 2px solid transparent;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--blue); color: var(--white); }
.btn-primary:hover { background: var(--blue-dark); box-shadow: 0 8px 20px -8px rgba(0, 82, 159, 0.6); }
.btn-amber { background: var(--amber); color: var(--dark); }
.btn-amber:hover { background: var(--amber-dark); color: var(--white); box-shadow: 0 8px 20px -8px rgba(235, 148, 25, 0.55); }
.btn-ghost { background: transparent; color: var(--blue); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--blue); background: var(--blue-soft); }
.btn-outline { background: var(--white); color: var(--blue); border-color: var(--blue); }
.btn-outline:hover { background: var(--blue); color: var(--white); }
.btn-sm { padding: 9px 16px; font-size: 0.88rem; }

.badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--white); border: 1px solid var(--line); border-radius: 999px;
  padding: 7px 14px; font-size: 0.8rem; font-weight: 600; color: var(--blue-ink);
  box-shadow: var(--shadow);
}
.badge-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--amber); }

.chip { display: inline-block; padding: 2px 9px; border-radius: 999px; font-size: 0.72rem; font-weight: 700; letter-spacing: 0.02em; }
.chip-demo { background: var(--blue-soft); color: var(--blue); }
.chip-grade { background: var(--amber-soft); color: var(--amber-dark); margin-left: 6px; vertical-align: 1px; }

/* ---------- Header ---------- */

.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; gap: 28px; min-height: 68px; }

.brand { display: flex; align-items: center; gap: 10px; color: var(--dark); }
.brand:hover { text-decoration: none; }
.brand img { border-radius: 8px; box-shadow: 0 2px 8px rgba(35, 31, 32, 0.12); }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-co { font-size: 0.62rem; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); }
.brand-name { font-size: 1.12rem; font-weight: 800; color: var(--blue); }

.site-nav { display: flex; align-items: center; gap: 22px; margin-left: auto; }
.site-nav > a:not(.btn) { color: var(--dark); font-weight: 600; font-size: 0.93rem; }
.site-nav > a:not(.btn):hover { color: var(--blue); text-decoration: none; }
.nav-cta { margin-left: 4px; }

.nav-toggle { display: none; }

/* ---------- Hero ---------- */

.hero {
  background:
    radial-gradient(52rem 30rem at 88% -10%, rgba(0, 82, 159, 0.10), transparent 60%),
    radial-gradient(40rem 26rem at -10% 20%, rgba(235, 148, 25, 0.10), transparent 55%),
    var(--white);
  padding: 64px 0 72px;
}
.hero-grid {
  display: grid; grid-template-columns: 1.15fr 0.85fr;
  gap: 48px; align-items: center;
}
.hero-copy h1 {
  font-size: clamp(2.3rem, 4.6vw, 3.6rem);
  line-height: 1.08; letter-spacing: -0.02em; margin: 20px 0 18px; font-weight: 800;
}
.grad {
  background: linear-gradient(92deg, var(--blue) 0%, var(--blue-dark) 45%, var(--amber) 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lede { font-size: 1.13rem; color: var(--muted); max-width: 34rem; margin: 0 0 26px; }
.lede em { font-style: normal; font-weight: 700; color: var(--dark); }
.cta-row { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
.hero-credit { margin-top: 26px; font-size: 0.86rem; color: var(--muted); }

/* ---------- Report mock ---------- */

.report-card {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow-lg); overflow: hidden; max-width: 420px; justify-self: end; width: 100%;
}
.report-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 18px; border-bottom: 1px solid var(--line);
}
.report-title { font-weight: 700; font-size: 0.95rem; }
.report-photo { position: relative; background: #eef3f8; }
.report-photo svg { display: block; width: 100%; height: auto; }
.pin {
  position: absolute; width: 14px; height: 14px; border-radius: 50%;
  background: var(--amber); border: 3px solid var(--white);
  box-shadow: 0 0 0 2px rgba(235, 148, 25, 0.45);
  animation: pulse 2.2s ease-in-out infinite;
}
.pin-a { top: 20%; left: 56%; }
.pin-b { top: 55%; left: 34%; }
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 2px rgba(235, 148, 25, 0.45); }
  50% { box-shadow: 0 0 0 7px rgba(235, 148, 25, 0.12); }
}

.report-body { padding: 16px 18px 18px; }
.score-row { display: flex; align-items: center; gap: 16px; }
.score-ring { width: 68px; height: 68px; flex: none; }
.score-label { font-weight: 700; font-size: 0.95rem; }
.score-meta { font-size: 0.8rem; color: var(--muted); margin-top: 3px; }
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0; }
.tag {
  background: var(--bg-soft); border: 1px solid var(--line); border-radius: 999px;
  padding: 4px 11px; font-size: 0.78rem; font-weight: 600; color: var(--dark);
}
.risk-row {
  display: flex; gap: 12px; background: var(--amber-soft);
  border: 1px solid rgba(235, 148, 25, 0.35); border-radius: 10px; padding: 12px 14px;
  font-size: 0.85rem;
}
.risk-row p { margin: 0; }
.risk-icon {
  flex: none; width: 10px; height: 10px; border-radius: 50%; margin-top: 6px;
  background: var(--amber); box-shadow: 0 0 0 3px rgba(235, 148, 25, 0.25);
}

/* ---------- Stats ---------- */

.stats { background: var(--blue-ink); color: var(--white); padding: 38px 0; }
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.stat { display: flex; gap: 14px; align-items: flex-start; }
.stat-num { font-weight: 800; font-size: 1.05rem; color: var(--amber); flex: none; padding-top: 1px; }
.stat p { margin: 0; font-size: 0.95rem; color: #D7E3EF; }

/* ---------- Sections ---------- */

.section { padding: 72px 0; }
.section-title { font-size: clamp(1.7rem, 3vw, 2.3rem); font-weight: 800; letter-spacing: -0.015em; margin: 0 0 8px; }
.section-sub { color: var(--muted); margin: 0 0 40px; max-width: 42rem; }

.steps-grid {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
}
.step {
  position: relative; background: var(--bg-soft); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 26px 22px 22px;
}
.step:hover { border-color: var(--blue); box-shadow: var(--shadow); }
.step-num {
  position: absolute; top: -13px; left: 20px;
  background: var(--blue); color: var(--white); font-weight: 800; font-size: 0.8rem;
  width: 26px; height: 26px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
}
.step svg { width: 30px; height: 30px; color: var(--amber); margin-bottom: 12px; }
.step h3 { margin: 0 0 8px; font-size: 1.05rem; }
.step p { margin: 0; font-size: 0.9rem; color: var(--muted); }

.why { background: var(--bg-soft); border-block: 1px solid var(--line); }
.why-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.why-card { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.why-card h3 { margin: 0 0 8px; font-size: 1.02rem; color: var(--blue-ink); }
.why-card h3::before { content: "◆ "; color: var(--sage); font-size: 0.8em; }
.why-card p { margin: 0; font-size: 0.92rem; color: var(--muted); }

/* ---------- About ---------- */

.about-grid { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 40px; align-items: start; }
.entity { margin: 22px 0 0; display: grid; gap: 12px; }
.entity div { display: grid; grid-template-columns: 200px 1fr; gap: 14px; padding-bottom: 12px; border-bottom: 1px solid var(--line); }
.entity dt { font-weight: 700; font-size: 0.88rem; color: var(--blue); }
.entity dd { margin: 0; font-size: 0.9rem; color: var(--dark); }

.partner-card {
  background: var(--white); border: 1px solid var(--line); border-left: 5px solid var(--blue);
  border-radius: var(--radius); box-shadow: var(--shadow); padding: 26px;
}
.partner-label { text-transform: uppercase; letter-spacing: 0.12em; font-size: 0.7rem; font-weight: 700; color: var(--muted); }
.partner-card h3 { margin: 6px 0 10px; font-size: 1.35rem; color: var(--blue-ink); }
.partner-card p { font-size: 0.92rem; color: var(--muted); }
.partner-note { margin-top: 18px; font-size: 0.85rem !important; }

/* ---------- CTA panel ---------- */

.cta-panel {
  background:
    radial-gradient(46rem 22rem at 85% -40%, rgba(235, 148, 25, 0.28), transparent 60%),
    linear-gradient(135deg, var(--blue) 0%, var(--blue-dark) 60%, var(--blue-ink) 100%);
  border-radius: 20px; color: var(--white);
  text-align: center; padding: 56px 28px;
}
.cta-panel h2 { margin: 0 0 10px; font-size: clamp(1.6rem, 3vw, 2.2rem); font-weight: 800; }
.cta-panel p { margin: 0 auto 24px; max-width: 34rem; color: #D7E3EF; }
.cta-center { justify-content: center; }
.cta-fine { font-size: 0.82rem !important; margin-top: 22px !important; color: #B9CCDE !important; }

/* ---------- Footer ---------- */

.site-footer { background: var(--dark); color: #C9CDD2; padding: 48px 0 0; font-size: 0.9rem; }
.footer-grid { display: grid; grid-template-columns: 1.3fr 1fr 0.7fr; gap: 36px; }
.site-footer a { color: #E7EAEE; }
.site-footer a:hover { color: var(--amber); text-decoration: none; }
.footer-brand { display: flex; align-items: center; gap: 10px; font-weight: 800; color: var(--white); margin-top: 0; }
.footer-brand img { border-radius: 6px; }
.footer-head { text-transform: uppercase; letter-spacing: 0.12em; font-size: 0.72rem; font-weight: 700; color: var(--amber); margin-top: 0; }
.footer-legal { border-top: 1px solid #3A3536; margin-top: 36px; padding: 16px 24px; font-size: 0.8rem; color: #8E9298; }

/* ---------- Reveal animation ---------- */

.reveal { opacity: 0; transform: translateY(14px); transition: opacity 0.55s ease, transform 0.55s ease; }
.reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .pin { animation: none; }
}

/* ---------- Responsive ---------- */

@media (max-width: 940px) {
  .hero-grid { grid-template-columns: 1fr; }
  .report-card { justify-self: start; }
  .steps-grid { grid-template-columns: repeat(2, 1fr); }
  .why-grid { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 720px) {
  .nav-toggle {
    display: flex; flex-direction: column; gap: 5px; margin-left: auto;
    background: none; border: 0; padding: 8px; cursor: pointer;
  }
  .nav-toggle span { width: 22px; height: 2.5px; background: var(--dark); border-radius: 2px; transition: transform 0.2s ease, opacity 0.2s ease; }
  .nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

  .site-nav {
    display: none; position: absolute; top: 68px; left: 0; right: 0;
    background: var(--white); border-bottom: 1px solid var(--line);
    flex-direction: column; align-items: stretch; gap: 0; padding: 10px 24px 18px;
    box-shadow: 0 18px 30px -18px rgba(35, 31, 32, 0.25);
  }
  .site-nav.open { display: flex; }
  .site-nav > a:not(.btn) { padding: 11px 0; border-bottom: 1px solid var(--bg-soft); }
  .nav-cta { margin: 12px 0 0; text-align: center; }

  .stats-grid { grid-template-columns: 1fr; gap: 18px; }
  .steps-grid { grid-template-columns: 1fr; }
  .entity div { grid-template-columns: 1fr; gap: 4px; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .section { padding: 52px 0; }
  .hero { padding: 44px 0 52px; }
}