/* ============================================================
   博盛佳國際有限公司 — V3「淨白」現代簡約產品風
   Foresta International Ltd.
   ============================================================ */

:root {
  --white: #FFFFFF;
  --ink: #1A1D1B;
  --green: #2E7D4F;
  --surface: #F2F4F1;
  --hairline: #E4E7E3;
  --muted: #6C756F;
  --font-tc: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  --font-latin: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --max-w: 1160px;
  --radius: 2px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-tc);
  font-weight: 400;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  letter-spacing: 0.02em;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }

:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 3px;
}

::selection { background: var(--green); color: var(--white); }

/* ---------- Type utilities ---------- */
.latin {
  font-family: var(--font-latin);
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.eyebrow {
  font-family: var(--font-latin);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--green);
  display: block;
  margin-bottom: 1.1rem;
}

.section-title {
  font-size: clamp(1.9rem, 4vw, 2.75rem);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: 0.04em;
}

.section-lede {
  margin-top: 1.25rem;
  max-width: 38em;
  color: var(--muted);
}

.text-green { color: var(--green); }

/* ---------- Layout ---------- */
.container {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 5vw, 3rem);
}

.section { padding-block: clamp(4rem, 9vw, 7.5rem); }
.section--surface { background: var(--surface); }
.section--hairline-top { border-top: 1px solid var(--hairline); }

/* Section header with vertical seal */
.section-head {
  display: flex;
  align-items: flex-start;
  gap: 2rem;
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}
.section-head .head-main { flex: 1; }

/* ---------- Vertical text (signature element) ---------- */
.vertical-seal {
  writing-mode: vertical-rl;
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.55em;
  color: var(--muted);
  border-block-start: 1px solid var(--hairline);
  padding-block-start: 0.9rem;
  min-height: 8.5em;
  flex-shrink: 0;
}
.vertical-seal--green { color: var(--green); border-block-start-color: var(--green); }

/* ---------- Green rule ---------- */
.rule-green {
  width: 3.5rem;
  height: 2px;
  background: var(--green);
  border: 0;
  margin: 0;
}

/* ============================================================
   Header / Nav
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--hairline);
}

.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.brand img {
  width: 36px;
  height: 36px;
  object-fit: contain;
  border-radius: var(--radius);
}
.brand-text { line-height: 1.25; }
.brand-name {
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: 0.08em;
}
.brand-en {
  font-family: var(--font-latin);
  font-size: 0.58rem;
  font-weight: 500;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--muted);
  display: block;
}

.nav-links {
  display: flex;
  gap: clamp(1rem, 2.5vw, 2.25rem);
  align-items: center;
}
.nav-links a {
  font-size: 0.92rem;
  letter-spacing: 0.1em;
  padding: 0.4rem 0.1rem;
  position: relative;
  color: var(--ink);
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; right: 100%;
  bottom: 0;
  height: 2px;
  background: var(--green);
  transition: right 0.25s ease;
}
.nav-links a:hover::after,
.nav-links a[aria-current="page"]::after { right: 0; }
.nav-links a[aria-current="page"] { color: var(--green); font-weight: 500; }

.nav-cta {
  border: 1px solid var(--ink);
  padding: 0.45rem 1.3rem !important;
  border-radius: var(--radius);
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.nav-cta::after { display: none; }
.nav-cta:hover {
  background: var(--green);
  border-color: var(--green);
  color: var(--white);
}

/* Hamburger */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.6rem;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--ink);
  margin: 5px 0;
  transition: transform 0.25s ease, opacity 0.25s ease;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ============================================================
   Hero (index)
   ============================================================ */
.hero {
  position: relative;
  padding-block: clamp(4.5rem, 11vw, 9rem);
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: clamp(2rem, 6vw, 5rem);
  align-items: stretch;
}
.hero h1 {
  font-size: clamp(2.6rem, 7.5vw, 4.6rem);
  font-weight: 900;
  line-height: 1.28;
  letter-spacing: 0.06em;
}
.hero h1 > span { display: block; }
.hero-en {
  font-family: var(--font-latin);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.42em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 2rem;
  display: block;
}
.hero-rule {
  width: 5.5rem;
  height: 2px;
  background: var(--green);
  border: 0;
  margin: 2.25rem 0;
}
.hero-sub {
  max-width: 32em;
  color: var(--muted);
  margin-bottom: 2.75rem;
}
.hero-vertical {
  writing-mode: vertical-rl;
  font-size: clamp(1rem, 1.8vw, 1.25rem);
  font-weight: 500;
  letter-spacing: 0.75em;
  color: var(--ink);
  border-block-start: 2px solid var(--green);
  padding-block-start: 1.4rem;
  align-self: stretch;
  display: flex;
  align-items: flex-start;
}
.hero-vertical .sub {
  font-family: var(--font-latin);
  font-size: 0.6rem;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: var(--muted);
  margin-inline-start: 1rem;
}

/* Buttons */
.btn {
  display: inline-block;
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  padding: 0.95rem 2.6rem;
  border-radius: var(--radius);
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--white);
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}
.btn:hover { background: var(--green); border-color: var(--green); }
.btn--ghost {
  background: transparent;
  color: var(--ink);
}
.btn--ghost:hover { background: var(--ink); color: var(--white); }

/* Hero footnote strip */
.hero-strip {
  border-top: 1px solid var(--hairline);
  padding-block: 1.4rem;
}
.hero-strip .container {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 3rem;
  font-size: 0.82rem;
  color: var(--muted);
  letter-spacing: 0.08em;
}
.hero-strip strong { color: var(--ink); font-weight: 500; }

/* ============================================================
   Cards / Grids
   ============================================================ */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--hairline); border: 1px solid var(--hairline); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--hairline); border: 1px solid var(--hairline); }

.cell {
  background: var(--white);
  padding: clamp(1.5rem, 3vw, 2.5rem);
}
.cell--surface { background: var(--surface); }

/* Product series card */
.product-card {
  background: var(--white);
  display: flex;
  flex-direction: column;
}
.product-card .figure {
  background: var(--surface);
  border-bottom: 1px solid var(--hairline);
  aspect-ratio: 4 / 3;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}
.product-card .figure svg { width: 100%; height: 100%; max-width: 220px; }
.product-card .body {
  padding: clamp(1.4rem, 2.5vw, 2rem);
  flex: 1;
  display: flex;
  flex-direction: column;
}
.series-no {
  font-family: var(--font-latin);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--green);
  margin-bottom: 0.6rem;
  display: block;
}
.product-card h3 {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  margin-bottom: 0.6rem;
}
.product-card p {
  font-size: 0.9rem;
  color: var(--muted);
  flex: 1;
}
.product-card .items {
  margin-top: 1.1rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--hairline);
  font-size: 0.85rem;
  color: var(--ink);
}
.product-card .items li {
  padding-left: 1.1em;
  position: relative;
}
.product-card .items li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--green);
}

/* Feature / value list */
.value-item h3 {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
}
.value-item h3 .no {
  font-family: var(--font-latin);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--green);
}
.value-item p { font-size: 0.92rem; color: var(--muted); }

/* Definition rows (about page company data) */
.data-table { border-top: 1px solid var(--hairline); }
.data-table > div {
  display: grid;
  grid-template-columns: 11rem 1fr;
  gap: 1.5rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--hairline);
}
.data-table dt {
  font-size: 0.85rem;
  letter-spacing: 0.14em;
  color: var(--muted);
}
.data-table dd { font-size: 0.95rem; }

/* Split section (text + aside) */
.split {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(2.5rem, 6vw, 5rem);
  align-items: start;
}

/* CTA band */
.cta-band {
  text-align: center;
  padding-block: clamp(4.5rem, 9vw, 7rem);
  border-top: 1px solid var(--hairline);
}
.cta-band h2 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 900;
  letter-spacing: 0.06em;
  margin-bottom: 1rem;
}
.cta-band p { color: var(--muted); max-width: 34em; margin: 0 auto 2.25rem; }

/* ============================================================
   Page hero (inner pages)
   ============================================================ */
.page-hero {
  padding-block: clamp(3.5rem, 8vw, 6rem);
  border-bottom: 1px solid var(--hairline);
}
.page-hero .wrap {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 2rem;
}
.page-hero h1 {
  font-size: clamp(2.3rem, 6vw, 3.8rem);
  font-weight: 900;
  letter-spacing: 0.06em;
  line-height: 1.3;
}
.page-hero .lede {
  margin-top: 1.4rem;
  max-width: 36em;
  color: var(--muted);
}

/* ============================================================
   Technology diagrams
   ============================================================ */
.diagram-frame {
  background: var(--white);
  border: 1px solid var(--hairline);
  padding: clamp(1.5rem, 3vw, 2.5rem);
}
.diagram-frame figcaption {
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--hairline);
  font-size: 0.85rem;
  color: var(--muted);
  letter-spacing: 0.06em;
}
.diagram-frame svg { width: 100%; height: auto; }

/* Steps (services) */
.steps { counter-reset: step; border-top: 1px solid var(--hairline); }
.step {
  display: grid;
  grid-template-columns: 5rem 1fr;
  gap: 1.5rem;
  padding: 2rem 0;
  border-bottom: 1px solid var(--hairline);
}
.step .num {
  font-family: var(--font-latin);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.25em;
  color: var(--green);
  padding-top: 0.4rem;
}
.step h3 {
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}
.step p { color: var(--muted); font-size: 0.95rem; max-width: 44em; }
.step .tags {
  margin-top: 0.9rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.step .tags span {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  border: 1px solid var(--hairline);
  padding: 0.25rem 0.8rem;
  border-radius: var(--radius);
  color: var(--muted);
}

/* ============================================================
   Contact form — underline style
   ============================================================ */
.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr);
  gap: clamp(2.5rem, 6vw, 5rem);
}

.form-field { margin-bottom: 2.1rem; }
.form-field label {
  display: block;
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  color: var(--muted);
  margin-bottom: 0.35rem;
}
.form-field label .req { color: var(--green); margin-left: 0.25em; }

.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  font-family: inherit;
  font-size: 1rem;
  color: var(--ink);
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--ink);
  border-radius: 0;
  padding: 0.5rem 0;
  transition: border-color 0.2s ease;
  appearance: none;
}
.form-field select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%231A1D1B' stroke-width='1.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.25rem center;
  padding-right: 1.75rem;
  cursor: pointer;
}
.form-field textarea { resize: vertical; min-height: 7.5rem; line-height: 1.7; }
.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  outline: none;
  border-bottom-color: var(--green);
  box-shadow: 0 1px 0 0 var(--green);
}
.form-field input::placeholder,
.form-field textarea::placeholder { color: #B4BBB6; }

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.form-note {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 1.25rem;
  letter-spacing: 0.04em;
}

/* Contact info list */
.contact-list { border-top: 1px solid var(--hairline); }
.contact-list > div {
  display: grid;
  grid-template-columns: 6.5rem 1fr;
  gap: 1rem;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--hairline);
}
.contact-list dt {
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  color: var(--muted);
  padding-top: 0.15rem;
}
.contact-list dd { font-size: 0.98rem; }
.contact-list a { border-bottom: 1px solid var(--hairline); transition: border-color 0.2s ease, color 0.2s ease; }
.contact-list a:hover { color: var(--green); border-color: var(--green); }

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  border-top: 1px solid var(--hairline);
  padding-block: clamp(3rem, 6vw, 4.5rem) 2rem;
  font-size: 0.88rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr auto;
  gap: 2.5rem;
  margin-bottom: 3rem;
}
.footer-brand .name { font-weight: 800; font-size: 1.05rem; letter-spacing: 0.08em; }
.footer-brand .en {
  font-family: var(--font-latin);
  font-size: 0.6rem;
  font-weight: 500;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--muted);
  display: block;
  margin: 0.35rem 0 1rem;
}
.footer-brand .slogan { color: var(--muted); font-size: 0.85rem; }

.site-footer h4 {
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  color: var(--muted);
  margin-bottom: 1rem;
}
.site-footer li { margin-bottom: 0.5rem; }
.site-footer li a {
  color: var(--ink);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}
.site-footer li a:hover { color: var(--green); border-bottom-color: var(--green); }
.footer-contact li { color: var(--ink); }
.footer-contact span { color: var(--muted); margin-right: 0.5em; font-size: 0.8rem; }

.footer-vertical {
  writing-mode: vertical-rl;
  font-size: 0.8rem;
  letter-spacing: 0.6em;
  color: var(--muted);
  border-block-start: 1px solid var(--hairline);
  padding-block-start: 0.9rem;
  justify-self: end;
}

.footer-bottom {
  border-top: 1px solid var(--hairline);
  padding-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.08em;
}
.footer-bottom .latin { letter-spacing: 0.25em; font-size: 0.65rem; }

/* ============================================================
   Fade-in (subtle, once)
   ============================================================ */
.fade-in {
  opacity: 0;
  transform: translateY(14px);
  animation: fadeUp 0.7s ease forwards;
}
.fade-in.d1 { animation-delay: 0.1s; }
.fade-in.d2 { animation-delay: 0.2s; }
.fade-in.d3 { animation-delay: 0.3s; }
@keyframes fadeUp {
  to { opacity: 1; transform: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001s !important;
    animation-delay: 0s !important;
    transition-duration: 0.001s !important;
  }
  .fade-in { opacity: 1; transform: none; animation: none; }
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-vertical { display: none; }
  .split, .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--hairline);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.5rem 0 1.25rem;
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a {
    padding: 0.85rem clamp(1.25rem, 5vw, 3rem);
    border-bottom: 1px solid var(--hairline);
  }
  .nav-links a::after { display: none; }
  .nav-cta {
    border: none;
    margin: 0.75rem clamp(1.25rem, 5vw, 3rem) 0;
    background: var(--ink);
    color: var(--white);
    text-align: center;
    padding: 0.85rem 1rem !important;
  }

  .hero-grid { grid-template-columns: 1fr auto; gap: 1.5rem; }
  .hero-vertical { letter-spacing: 0.5em; font-size: 0.95rem; padding-block-start: 0.9rem; }
  .grid-2, .grid-4 { grid-template-columns: 1fr; }
  .data-table > div { grid-template-columns: 1fr; gap: 0.15rem; }
  .step { grid-template-columns: 1fr; gap: 0.35rem; }
  .form-row { grid-template-columns: 1fr; gap: 0; }
  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
  .page-hero .wrap { flex-direction: column; align-items: flex-start; }
  .section-head .vertical-seal { display: none; }
}