:root {
  --navy: #0F2A4A; --blue: #1E5AA8; --blue-bright: #2E7BD6;
  --phone: #F5793B; --line: #06C755; --bg: #F5F7FA;
  --ink: #1A2230; --muted: #667085; --white: #FFFFFF;
  --maxw: 1120px; --radius: 14px; --shadow: 0 6px 24px rgba(15,42,74,.10);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body { font-family: "Noto Sans TC", system-ui, -apple-system, "PingFang TC", sans-serif;
  color: var(--ink); line-height: 1.7; background: var(--white); }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.container { width: min(100% - 32px, var(--maxw)); margin-inline: auto; }
.container.narrow { width: min(100% - 32px, 760px); }
.section { padding: 56px 0; }
.section-title { font-size: clamp(24px, 5vw, 34px); font-weight: 900;
  color: var(--navy); text-align: center; margin-bottom: 8px; }
.section-sub { text-align: center; color: var(--muted); margin-bottom: 32px; }

/* Header */
.site-header { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.95);
  backdrop-filter: blur(6px); box-shadow: 0 2px 12px rgba(15,42,74,.08); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { font-weight: 900; font-size: 22px; color: var(--navy); letter-spacing: 1px; }
.header-cta { display: flex; gap: 8px; }

/* Buttons */
.btn { display: inline-flex; align-items: center; gap: 6px; font-weight: 700;
  padding: 10px 16px; border-radius: 999px; white-space: nowrap; transition: transform .1s, filter .1s; }
.btn:active { transform: scale(.97); }
.btn-phone { background: var(--phone); color: #fff; }
.btn-line { background: var(--line); color: #fff; }
.btn-lg { padding: 15px 26px; font-size: 17px; }

/* Hero */
.hero { position: relative; min-height: 78vh; display: grid; place-items: center;
  background: url("images/web/hero.jpg") center/cover no-repeat; color: #fff; text-align: center; }
.hero-overlay { position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(15,42,74,.55), rgba(15,42,74,.78)); }
.hero-content { position: relative; padding: 40px 0; }
.hero h1 { font-size: clamp(28px, 7vw, 52px); font-weight: 900; line-height: 1.25;
  text-shadow: 0 2px 16px rgba(0,0,0,.4); }
.hero-slogan { font-size: clamp(16px, 3.5vw, 22px); margin: 16px 0 28px; opacity: .95; }
.hero-cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* Services */
#services { background: var(--bg); }
.service-grid { display: grid; gap: 20px; grid-template-columns: 1fr; }
.service-card { background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.service-card img { width: 100%; height: 200px; object-fit: cover; }
.service-body { padding: 18px 20px 22px; }
.service-body h3 { color: var(--navy); font-size: 20px; margin-bottom: 8px; }
.service-body p { color: var(--muted); }

/* Why */
.feature-grid { display: grid; gap: 20px; grid-template-columns: 1fr 1fr; }
.feature { text-align: center; padding: 22px 14px; background: var(--bg); border-radius: var(--radius); }
.feature-ico { font-size: 40px; display: block; margin-bottom: 10px; }
.feature h3 { color: var(--navy); font-size: 17px; margin-bottom: 4px; }
.feature p { color: var(--muted); font-size: 14px; }

/* Gallery */
.gallery-grid { display: grid; gap: 10px; grid-template-columns: repeat(2, 1fr); }
.gallery-item { padding: 0; border: 0; cursor: pointer; background: none; border-radius: 10px; overflow: hidden; }
.gallery-item img { width: 100%; height: 130px; object-fit: cover; transition: transform .2s; }
.gallery-item:hover img { transform: scale(1.05); }
.lightbox { position: fixed; inset: 0; z-index: 100; background: rgba(0,0,0,.9);
  display: grid; place-items: center; padding: 20px; }
.lightbox[hidden] { display: none; }
.lightbox-img { max-width: 92vw; max-height: 86vh; object-fit: contain; border-radius: 8px; }
.lightbox-close { position: absolute; top: 16px; right: 20px; font-size: 30px; color: #fff;
  background: none; border: 0; cursor: pointer; }

/* FAQ */
.faq-list { display: grid; gap: 12px; }
.faq-item { background: var(--bg); border-radius: 12px; padding: 4px 18px; }
.faq-item summary { cursor: pointer; font-weight: 700; color: var(--navy);
  padding: 14px 0; list-style: none; position: relative; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "＋"; position: absolute; right: 0; color: var(--blue-bright); }
.faq-item[open] summary::after { content: "－"; }
.faq-item p { padding: 0 0 16px; color: var(--muted); }

/* Contact / footer */
.contact { background: var(--navy); color: #fff; text-align: center; padding: 56px 0 84px; }
.contact-title { color: #fff; }
.contact-sub { color: #cdd8e8; margin-bottom: 26px; }
.contact-cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-bottom: 26px; }
.contact-info { list-style: none; display: grid; gap: 8px; color: #dbe4f0; margin-bottom: 20px; }
.footer-brand { color: #9fb2cc; font-size: 14px; }

/* Mobile floating bar */
.mobile-bar { display: none; position: fixed; bottom: 0; left: 0; right: 0; z-index: 60;
  gap: 1px; background: rgba(15,42,74,.15); }
.mobile-bar-btn { flex: 1; text-align: center; padding: 15px 0; font-weight: 700; color: #fff; }
.mobile-bar-btn.phone { background: var(--phone); }
.mobile-bar-btn.line { background: var(--line); }

/* Responsive */
@media (min-width: 640px) {
  .service-grid { grid-template-columns: 1fr 1fr; }
  .gallery-grid { grid-template-columns: repeat(3, 1fr); }
  .gallery-item img { height: 170px; }
}
@media (min-width: 900px) { .feature-grid { grid-template-columns: repeat(4, 1fr); } }
@media (min-width: 1000px) {
  .service-grid { grid-template-columns: repeat(4, 1fr); }
  .gallery-grid { grid-template-columns: repeat(4, 1fr); }
  .gallery-item img { height: 190px; }
}
@media (max-width: 768px) { .mobile-bar { display: flex; } .contact { padding-bottom: 96px; } }
@media (max-width: 480px) {
  .brand { font-size: 19px; }
  .btn { padding: 9px 12px; font-size: 14px; }
}