:root {
  --bg: #f5f7fa;
  --bg-alt: #eef1f5;
  --surface: #ffffff;
  --line: #e3e7ed;
  --line-strong: #cdd4de;
  --ink: #0f172a;
  --ink-soft: #334155;
  --ink-dim: #64748b;
  --navy: #0b2a4a;
  --navy-2: #143d6b;
  --amber: #d97706;
  --amber-2: #b45309;
  --radius: 6px;
  --maxw: 1280px;
}

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

html, body { height: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--navy); text-decoration: none; }
a:hover { color: var(--amber); }

/* Header block — white, subtle grid, navy title (part number) */
.header {
  position: relative;
  padding: 88px 24px 40px;
  text-align: center;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  background-image:
    repeating-linear-gradient(90deg, transparent 0 39px, rgba(11,42,74,0.035) 39px 40px);
}

.home-btn {
  position: absolute;
  top: 16px;
  left: 16px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: var(--surface);
  border: 1px solid var(--line-strong);
  color: var(--ink-soft);
  border-radius: var(--radius);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  transition: color .2s ease, border-color .2s ease;
}
.home-btn::before {
  content: "‹";
  color: var(--amber);
  font-weight: 700;
  font-size: 16px;
  line-height: 1;
}
.home-btn:hover { color: var(--navy); border-color: var(--navy); }

.header-eyebrow {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 2.4px;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 12px;
}

.header-title {
  font-size: clamp(24px, 3.4vw, 38px);
  font-weight: 700;
  letter-spacing: 0.2px;
  line-height: 1.2;
  color: var(--navy);
  max-width: 900px;
  margin: 0 auto;
  font-family: "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  word-break: break-word;
}

.header-desc {
  margin: 14px auto 0;
  max-width: 780px;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.6;
}

/* Floating inquiry CTA — amber, prominent, reads as the primary action */
.mail-btn {
  position: fixed;
  right: 20px;
  bottom: 88px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--radius);
  background: var(--amber);
  color: #fff;
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.6px;
  text-transform: uppercase;
  box-shadow: 0 8px 22px rgba(217,119,6,0.30), 0 1px 2px rgba(15,23,42,0.08);
  transition: background .2s ease, transform .2s ease, box-shadow .2s ease;
  z-index: 10;
}
.mail-btn:hover {
  background: var(--amber-2);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(217,119,6,0.40);
}

/* Image gallery — white cards, hairline border, large display */
.pic-list {
  width: 100%;
  max-width: var(--maxw);
  margin: 32px auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.pic-list img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 8px;
  transition: border-color .2s ease, box-shadow .2s ease;
}

.pic-list img:hover {
  border-color: var(--navy);
  box-shadow: 0 8px 24px rgba(11,42,74,0.10);
}

/* Tablet portrait */
@media (max-width: 768px) {
  .header { padding: 72px 16px 32px; }
  .pic-list { padding: 0 16px; gap: 14px; margin: 20px auto; }
  .home-btn { top: 12px; left: 12px; padding: 6px 12px; font-size: 11px; }
  .header-eyebrow { font-size: 10px; letter-spacing: 2px; }
  .header-desc { font-size: 14px; }
}

/* Small phone — sticky full-width CTA, leave space at body bottom so it does not cover content */
@media (max-width: 768px) {
  body { padding-bottom: calc(64px + env(safe-area-inset-bottom, 0px)); }
  .mail-btn {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    max-width: 100%;
    padding: 16px 20px calc(16px + env(safe-area-inset-bottom, 0px));
    border-radius: 0;
    justify-content: center;
    font-size: 14px;
    letter-spacing: 1px;
    box-shadow: 0 -6px 24px rgba(15,23,42,0.12), 0 -1px 0 rgba(0,0,0,0.04);
  }
  .mail-btn:hover { transform: none; box-shadow: 0 -6px 24px rgba(15,23,42,0.12); }
}

@media (max-width: 480px) {
  .header { padding: 60px 14px 28px; }
  .pic-list { padding: 0 12px; gap: 10px; margin: 16px auto; }
  .pic-list img { padding: 6px; }
  .header-desc { font-size: 13.5px; margin-top: 10px; }
}

/* Footer */
.footer {
  margin-top: auto;
  padding: 24px 16px;
  background: var(--navy);
  color: #cbd5e1;
  font-size: 13px;
  line-height: 1.6;
  text-align: center;
}
.footer a { color: #fff; }
.footer a:hover { color: var(--amber); }
.footer .copyright { margin-bottom: 4px; letter-spacing: 0.4px; opacity: 0.8; }