:root {
  --ocean: #0b4f6c;
  --deep: #062a3a;
  --sky: #9ad7e8;
  --sand: #f6efe2;
  --coral: #ff7a59;
  --text: #1d2a30;
  --muted: #5b6b72;
  --card: #ffffff;
  --radius: 16px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Noto Sans TC", system-ui, sans-serif;
  color: var(--text);
  background: var(--sand);
  line-height: 1.7;
}
a { color: inherit; text-decoration: none; }

/* nav */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 10;
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 24px;
  background: rgba(6, 42, 58, .75);
  backdrop-filter: blur(8px);
  color: #fff;
}
.brand { font-weight: 900; font-size: 1.3rem; letter-spacing: .05em; }
.brand span { color: var(--coral); margin-left: 4px; font-size: .9rem; }
.nav nav { display: flex; gap: 20px; align-items: center; font-size: .95rem; }
.nav nav a:hover { color: var(--sky); }
.btn-sm { background: var(--coral); padding: 6px 14px; border-radius: 999px; font-weight: 700; }
.btn-sm:hover { color: #fff !important; filter: brightness(1.1); }

/* hero */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex; align-items: center;
  padding: 120px 24px 160px;
  color: #fff;
  background:
    radial-gradient(circle at 80% 20%, rgba(255, 200, 120, .55), transparent 30%),
    linear-gradient(180deg, #2a8fb5 0%, var(--ocean) 55%, var(--deep) 100%);
  overflow: hidden;
}
.hero-inner { max-width: 1080px; margin: 0 auto; width: 100%; }
.eyebrow { letter-spacing: .2em; color: var(--sky); font-weight: 700; margin: 0 0 8px; }
.hero h1 { font-size: clamp(2.2rem, 6vw, 4rem); line-height: 1.25; margin: 0 0 20px; font-weight: 900; }
.lead { font-size: 1.15rem; max-width: 560px; opacity: .92; margin: 0 0 32px; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }
.waves { position: absolute; left: 0; bottom: -1px; width: 100%; height: 160px; }
.w1 { fill: rgba(246, 239, 226, .45); animation: drift 9s ease-in-out infinite alternate; }
.w2 { fill: var(--sand); }
@keyframes drift { to { transform: translateX(-40px); } }

/* buttons */
.btn {
  display: inline-block;
  background: var(--coral); color: #fff;
  padding: 12px 26px; border-radius: 999px;
  font-weight: 700; border: 2px solid var(--coral);
  cursor: pointer; font-size: 1rem; font-family: inherit;
  transition: transform .15s, filter .15s;
}
.btn:hover { transform: translateY(-2px); filter: brightness(1.08); }
.btn.ghost { background: transparent; border-color: #fff; }
.btn.full { width: 100%; text-align: center; }

/* sections */
.section { padding: 88px 24px; max-width: 1080px; margin: 0 auto; }
.section.alt { max-width: none; background: #e8f4f7; }
.section.alt > * { max-width: 1080px; margin-left: auto; margin-right: auto; }
.section h2 { font-size: clamp(1.7rem, 4vw, 2.3rem); text-align: center; margin: 0 0 12px; color: var(--ocean); }
.sub { text-align: center; color: var(--muted); margin: 0 0 40px; }
#why h2, #flow h2 { margin-bottom: 40px; }
.grid3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px; }

.card { background: var(--card); padding: 28px; border-radius: var(--radius); box-shadow: 0 6px 20px rgba(11, 79, 108, .08); }
.card .icon { font-size: 2.2rem; }
.card h3 { margin: 8px 0; color: var(--ocean); }
.card p { margin: 0; color: var(--muted); }

/* pricing */
.price {
  position: relative;
  background: var(--card); padding: 32px 28px; border-radius: var(--radius);
  box-shadow: 0 6px 20px rgba(11, 79, 108, .08);
  display: flex; flex-direction: column;
}
.price h3 { margin: 0; color: var(--ocean); }
.amount { font-size: 2rem; font-weight: 900; margin: 8px 0 16px; }
.amount small { font-size: .95rem; font-weight: 400; color: var(--muted); margin-left: 4px; }
.price ul { padding-left: 20px; margin: 0 0 24px; color: var(--muted); flex: 1; }
.price.featured { border: 3px solid var(--coral); transform: scale(1.03); }
.tag {
  position: absolute; top: -14px; right: 20px;
  background: var(--coral); color: #fff; font-size: .8rem; font-weight: 700;
  padding: 4px 12px; border-radius: 999px;
}

/* steps */
.steps { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px; counter-reset: s; }
.steps li { background: var(--card); border-radius: var(--radius); padding: 24px; counter-increment: s; position: relative; }
.steps li::before {
  content: counter(s);
  display: grid; place-items: center;
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--ocean); color: #fff; font-weight: 700; margin-bottom: 10px;
}
.steps b { display: block; font-size: 1.1rem; }
.steps span { color: var(--muted); }

/* faq */
.faq { max-width: 760px; }
.faq details { background: var(--card); border-radius: 12px; padding: 16px 20px; margin-bottom: 12px; }
.faq summary { cursor: pointer; font-weight: 700; color: var(--ocean); }
.faq p { margin: 10px 0 0; color: var(--muted); }

/* contact */
.contact-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 32px; align-items: start; }
.contact-grid p { margin: 0 0 12px; }
.form { display: grid; gap: 12px; background: var(--card); padding: 24px; border-radius: var(--radius); box-shadow: 0 6px 20px rgba(11, 79, 108, .08); }
.form input, .form select {
  font: inherit; padding: 12px 14px; border: 1px solid #cfdde2; border-radius: 10px; background: #fff;
}
.ok { color: var(--ocean); font-weight: 700; margin: 0; }

.foot { text-align: center; padding: 28px 16px; background: var(--deep); color: #9fb6c0; font-size: .9rem; }

@media (max-width: 640px) {
  .nav { padding: 12px 16px; }
  .nav nav a:not(.btn-sm) { display: none; }
  .section { padding: 64px 16px; }
  .hero { padding: 100px 16px 140px; }
  .price.featured { transform: none; }
}