/* RainbowSky / 虹宇國際 — Brand Kit v1.2 (Soft Green) */
:root {
  --bg: #ffffff;
  --canvas: #ffffff;
  --paper: #f4f1ea;
  --ink: #1b1b18;
  --muted: #5c5a54;
  --accent: #7cb89a;
  --accent-hover: #3e7a5c;
  --tint: #e5f2eb;
  --line: #d3cec4;
  --card: #ffffff;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(27,27,24,.04), 0 8px 24px rgba(27,27,24,.06);
  --max: 1080px;
  --prose: 38rem;
  --font: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent-hover); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; display: block; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 1.25rem; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; min-height: 64px;
}
.brand {
  display: flex; flex-direction: column; align-items: flex-start; gap: .15rem;
  color: var(--ink); text-decoration: none;
}
.brand:hover { text-decoration: none; }
.brand-logo {
  display: block; height: 36px; width: auto; max-width: 200px;
  object-fit: contain;
}
.brand-zh {
  font-weight: 600; font-size: .72rem; letter-spacing: .04em;
  color: var(--muted); line-height: 1.2;
}
.brand-en { font-size: .75rem; color: var(--muted); letter-spacing: .04em; }
.footer-brand { display: inline-block; margin: 0 0 .65rem; text-decoration: none; }
.footer-brand:hover { text-decoration: none; }
.footer-brand img {
  display: block; height: 48px; width: auto; max-width: 220px;
  object-fit: contain;
}
.nav { display: flex; flex-wrap: wrap; gap: .15rem .85rem; align-items: center; }
.nav a {
  color: var(--muted); font-size: .9rem; text-decoration: none;
  padding: .35rem 0; border-bottom: 2px solid transparent;
}
.nav a:hover, .nav a.active { color: var(--accent-hover); border-bottom-color: var(--accent); text-decoration: none; }
.nav-cta {
  background: var(--accent); color: #fff !important; border-radius: 999px;
  padding: .4rem .9rem !important; border-bottom: none !important; font-weight: 600;
}
.nav-cta:hover { background: var(--accent-hover); color: #fff !important; }
.nav-toggle {
  display: none; background: none; border: 1px solid var(--line);
  border-radius: 8px; padding: .4rem .65rem; color: var(--ink); cursor: pointer;
}

/* Hero */
.hero {
  padding: 3rem 0 2.5rem;
  border-bottom: 1px solid var(--line);
}
.hero-kicker {
  display: inline-block; font-size: .8rem; font-weight: 600;
  color: var(--accent-hover); letter-spacing: .06em; margin-bottom: .75rem;
}
.hero h1 {
  font-size: clamp(1.65rem, 4vw, 2.35rem);
  line-height: 1.35; margin: 0 0 .75rem; font-weight: 700;
  letter-spacing: -.01em;
}
.hero .en-line {
  font-size: clamp(1rem, 2.2vw, 1.2rem);
  color: var(--muted); margin: 0 0 1rem; font-weight: 500;
}
.hero-lead { max-width: var(--prose); color: var(--muted); margin: 0 0 1rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .65rem; margin-top: 1.25rem; }

/* Split hero: text + visual */
.split-hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2rem;
  align-items: center;
}
.hero-visual {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--line);
  aspect-ratio: 4 / 3;
  background: var(--tint);
}
.hero-visual img {
  width: 100%; height: 100%;
  object-fit: cover;
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: .65rem 1.15rem; border-radius: 999px; font-weight: 600;
  font-size: .92rem; border: 1px solid transparent; cursor: pointer;
  text-decoration: none; transition: background .15s, color .15s, border-color .15s;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); color: #fff; }
.btn-ghost { background: transparent; color: var(--accent-hover); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--accent); background: var(--tint); }

/* Sections */
.section { padding: 2.75rem 0; }
.section + .section { border-top: 1px solid var(--line); }
.section-title {
  font-size: clamp(1.35rem, 2.5vw, 1.7rem);
  margin: 0 0 .5rem; font-weight: 700;
}
.section-sub { color: var(--muted); margin: 0 0 1.5rem; max-width: var(--prose); }
.eyebrow {
  font-size: .75rem; font-weight: 700; color: var(--accent-hover);
  letter-spacing: .08em; text-transform: uppercase; margin-bottom: .4rem;
}

/* Cards / grids */
.grid { display: grid; gap: 1rem; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.25rem 1.35rem;
  box-shadow: var(--shadow);
}
.card h3 { margin: 0 0 .5rem; font-size: 1.05rem; }
.card p { margin: 0; color: var(--muted); font-size: .95rem; max-width: var(--prose); }
.card .meta { font-size: .8rem; color: var(--accent-hover); font-weight: 600; margin-top: .75rem; }
.num {
  display: inline-flex; width: 1.75rem; height: 1.75rem;
  align-items: center; justify-content: center;
  background: var(--accent); color: #fff; border-radius: 50%;
  font-size: .8rem; font-weight: 700; margin-bottom: .65rem;
}

/* Card with media (4:3 cover) */
.card-media {
  padding: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.card-media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius) var(--radius) 0 0;
}
.card-media .card-body { padding: 1.15rem 1.25rem 1.35rem; }
.card-media .card-body h3 { margin: .35rem 0 .4rem; }
.card-media .card-body p { margin: 0; }

/* Media card / story with image */
.media-card {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 0;
  padding: 0;
  overflow: hidden;
  align-items: stretch;
}
.media-card img {
  width: 100%;
  height: 100%;
  min-height: 180px;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}
.media-card .card-body { padding: 1.25rem 1.35rem; }
.media-card .card-body p { max-width: var(--prose); }

/* Pipeline / tech visual */
.pipeline-visual {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  margin-bottom: 1.5rem;
  background: var(--tint);
}
.pipeline-visual img {
  width: 100%;
  max-height: 320px;
  object-fit: cover;
}
.pipeline-visual.compact img { max-height: 200px; }

/* Domain card with small thumb */
.domain-card .thumb {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 8px;
  margin-bottom: .75rem;
  background: var(--tint);
}

/* Value list */
.value-list { list-style: none; padding: 0; margin: 0; display: grid; gap: .85rem; }
.value-list li {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.1rem 1.25rem;
  box-shadow: var(--shadow);
}
.value-list strong { display: block; color: var(--accent-hover); margin-bottom: .25rem; }

/* Timeline */
.timeline { display: grid; gap: 1rem; }
.timeline-item {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.2rem 1.35rem;
  border-left: 3px solid var(--accent);
}
.timeline-item h3 { margin: 0 0 .35rem; font-size: 1rem; }
.timeline-item ul { margin: .5rem 0 0; padding-left: 1.1rem; color: var(--muted); }
.timeline-item .en { font-size: .85rem; color: var(--muted); margin-top: .5rem; }

/* Tables */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); }
table { width: 100%; border-collapse: collapse; font-size: .92rem; }
th, td { padding: .75rem 1rem; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
th { background: var(--tint); color: var(--accent-hover); font-weight: 700; }
tr:last-child td { border-bottom: none; }

/* Tech steps */
.steps { display: grid; gap: 1rem; }
.step {
  display: grid; grid-template-columns: auto 1fr; gap: 1rem;
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.25rem; box-shadow: var(--shadow);
}
.step-num {
  width: 2.25rem; height: 2.25rem; border-radius: 50%;
  background: var(--accent); color: #fff; display: flex;
  align-items: center; justify-content: center; font-weight: 700; flex-shrink: 0;
}
.step h3 { margin: 0 0 .35rem; font-size: 1.05rem; }
.step .en-title { font-size: .85rem; color: var(--muted); margin-bottom: .4rem; }
.step p { margin: 0; color: var(--muted); max-width: var(--prose); }

/* Product cards */
.product-group { margin-bottom: 2.5rem; }
.product-group h2 { font-size: 1.2rem; margin: 0 0 1rem; color: var(--accent-hover); }
.product-card h3 { margin: 0 0 .15rem; }
.product-card .problem { color: var(--ink); margin: .65rem 0; }
.product-card ul { margin: .4rem 0; padding-left: 1.1rem; color: var(--muted); }
.product-card .bundle {
  margin-top: .75rem; padding-top: .75rem; border-top: 1px solid var(--line);
  font-size: .85rem; color: var(--muted);
}
.product-card .bundle strong { color: var(--accent-hover); }

/* Form */
.form-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.5rem; box-shadow: var(--shadow); }
.form-grid { display: grid; gap: 1rem; }
.form-row { display: grid; gap: .35rem; }
.form-row label { font-weight: 600; font-size: .9rem; }
.form-row input, .form-row select, .form-row textarea {
  font: inherit; padding: .65rem .75rem; border: 1px solid var(--line);
  border-radius: 8px; background: #fff; color: var(--ink);
}
.form-row textarea { min-height: 110px; resize: vertical; }
.form-row input:focus, .form-row select:focus, .form-row textarea:focus {
  outline: 2px solid rgba(124,184,154,.35); border-color: var(--accent);
}
.checks { display: flex; flex-wrap: wrap; gap: .65rem 1.25rem; }
.checks label { font-weight: 400; display: flex; align-items: center; gap: .4rem; }

/* Callout / note */
.note {
  background: var(--tint); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1rem 1.15rem;
  color: var(--muted); font-size: .92rem;
}
.callout {
  background: var(--card); border: 1px solid var(--line);
  border-left: 3px solid var(--accent); border-radius: var(--radius);
  padding: 1.35rem 1.5rem; margin: 1.5rem 0;
}
.callout p { margin: 0 0 .75rem; max-width: var(--prose); }
.flow {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: .85rem; background: var(--tint); border: 1px dashed var(--line);
  border-radius: 8px; padding: 1rem; white-space: pre-wrap; color: var(--muted);
}

/* Footer */
.site-footer {
  margin-top: 2rem; border-top: 1px solid var(--line);
  background: var(--tint); padding: 2.5rem 0 1.5rem;
}
.footer-tagline {
  font-weight: 700; font-size: 1.05rem; color: var(--accent-hover); margin: 0 0 .75rem;
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 1.5rem;
  margin-bottom: 1.5rem;
}
.footer-grid h4 { margin: 0 0 .5rem; font-size: .85rem; color: var(--accent-hover); }
.footer-grid a, .footer-grid p { color: var(--muted); font-size: .9rem; margin: 0 0 .35rem; display: block; }
.footer-bottom {
  border-top: 1px solid var(--line); padding-top: 1rem;
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: .5rem;
  color: var(--muted); font-size: .8rem;
}

/* Utility */
.muted { color: var(--muted); }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.stack > * + * { margin-top: 1rem; }
.bilingual { margin-top: .5rem; font-size: .9rem; color: var(--muted); max-width: var(--prose); }
.page-hero { padding: 2.5rem 0 1.5rem; }
.page-hero h1 { margin: 0 0 .5rem; font-size: clamp(1.5rem, 3vw, 2rem); }
.chip {
  display: inline-block; font-size: .75rem; padding: .2rem .55rem;
  border-radius: 999px; background: var(--tint); color: var(--accent-hover); font-weight: 600;
}
.prose-narrow { max-width: var(--prose); }

@media (max-width: 860px) {
  .grid-3, .grid-2, .footer-grid { grid-template-columns: 1fr; }
  .split-hero { grid-template-columns: 1fr; }
  .split-hero .hero-visual { order: -1; max-height: 240px; }
  .media-card { grid-template-columns: 1fr; }
  .media-card img { min-height: 160px; max-height: 200px; }
  .nav-toggle { display: inline-flex; }
  .nav {
    display: none; position: absolute; left: 0; right: 0; top: 64px;
    flex-direction: column; align-items: stretch;
    background: var(--bg); border-bottom: 1px solid var(--line);
    padding: 1rem 1.25rem 1.25rem; gap: .35rem;
  }
  .nav.open { display: flex; }
  .nav a { padding: .55rem 0; }
  .step { grid-template-columns: 1fr; }
}