/* ─── RESET & BASE ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ─── NAV TOGGLE (hamburger) ─── */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 110;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

:root {
  --navy:       #1a3a5c;
  --navy-dark:  #112538;
  --gold:       #c9a87a;
  --gold-light: #e8d5b4;
  --cream:      #faf8f4;
  --beige:      #f0ebe3;
  --text:       #2a2520;
  --text-muted: #6b5f54;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Noto Serif TC', 'Noto Serif', serif;
  background: var(--cream);
  color: var(--text);
  line-height: 1.8;
}

img { display: block; width: 100%; height: 100%; object-fit: cover; }
a { text-decoration: none; }
ul { list-style: none; }


/* ─── NAVBAR ─── */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 3rem;
  transition: background 0.35s, box-shadow 0.35s;
}
#navbar.scrolled {
  background: rgba(17, 37, 56, 0.96);
  box-shadow: 0 2px 24px rgba(0,0,0,0.3);
  backdrop-filter: blur(10px);
}
.nav-logo img { height: 44px; width: auto; object-fit: contain; }
.nav-links {
  display: flex;
  gap: 2.25rem;
}
.nav-links a {
  color: rgba(255,255,255,0.9);
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--gold); }


/* ─── BUTTONS ─── */
.btn {
  display: inline-block;
  padding: 0.7rem 1.75rem;
  font-family: inherit;
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  border-radius: 1px;
  transition: all 0.25s;
  text-align: center;
  cursor: pointer;
  border: none;
}
.btn--outline {
  border: 1px solid rgba(255,255,255,0.55);
  color: #fff;
  background: transparent;
}
.btn--outline:hover { background: rgba(255,255,255,0.1); }
.btn--gold {
  background: var(--gold);
  color: var(--navy-dark);
  font-weight: 500;
}
.btn--gold:hover { background: var(--gold-light); }
.btn--navy {
  background: var(--navy);
  color: #fff;
}
.btn--navy:hover { background: var(--navy-dark); }
.btn--lg { padding: 1rem 2.75rem; font-size: 0.95rem; }


/* ─── SECTION SHARED ─── */
.section { padding: 6rem 4rem; }
.section--dark  { background: var(--navy);      color: #fff; }
.section--navy  { background: var(--navy-dark); color: #fff; }

.section-header { text-align: center; margin-bottom: 4rem; }
.section-header--left { text-align: left; margin-bottom: 1.5rem; }

.section-header h2,
.booking-inner h2,
.about-text .section-header h2 {
  font-family: 'Cormorant Garamond', 'Georgia', serif;
  font-size: 2.4rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
}
.section--dark .section-header h2,
.section--navy h2 { color: #fff; }

.section-sub {
  color: var(--gold);
  letter-spacing: 0.2em;
  font-size: 0.85rem;
  margin-top: 0.5rem;
}
.divider {
  width: 48px; height: 1px;
  background: var(--gold);
  margin: 0.75rem auto 0;
}
.divider--light { background: rgba(255,255,255,0.25); }
.divider--gold  { background: var(--gold); }
.section-header--left .divider { margin-left: 0; }


/* ─── HERO ─── */
#hero {
  height: 100vh;
  min-height: 600px;
  position: relative;
  overflow: hidden;
}
.hero-collage {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  height: 100%;
}
.hero-col {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.hero-col img { flex: 1; min-height: 0; }
.hero-col--center {
  background: var(--navy);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}
.hero-brand { text-align: center; }
.hero-logo {
  width: 180px;
  height: auto;
  margin: 0 auto 1.5rem;
  object-fit: contain;
}
.hero-tagline {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1rem;
  letter-spacing: 0.28em;
  color: var(--gold-light);
  margin-bottom: 2rem;
}
.hero-ctas {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}


/* ─── SERVICES ─── */
.service-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  max-width: 1100px;
  margin: 0 auto 4rem;
  align-items: stretch;
}
.service-block--reverse .service-img  { order: 2; }
.service-block--reverse .service-text { order: 1; }

.service-img {
  overflow: hidden;
  min-height: 400px;
}
.service-img img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.55s ease;
}
.service-img:hover img { transform: scale(1.05); }

.service-text {
  padding: 3.5rem;
  background: var(--beige);
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.service-num {
  display: block;
  font-family: 'Cormorant Garamond', serif;
  font-size: 3.5rem;
  color: var(--gold);
  line-height: 1;
  margin-bottom: 0.25rem;
  opacity: 0.6;
}
.service-text h3 {
  font-size: 1.35rem;
  font-weight: 500;
  margin-bottom: 1rem;
  letter-spacing: 0.04em;
}
.service-text > p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.95;
  margin-bottom: 1.25rem;
}
.service-text ul { margin-bottom: 1.75rem; }
.service-text ul li {
  font-size: 0.85rem;
  color: var(--text-muted);
  padding: 0.2rem 0;
}
.service-text ul li::before { content: '— '; color: var(--gold); }

.link-arrow {
  color: var(--navy);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  border-bottom: 1px solid var(--navy);
  padding-bottom: 2px;
  width: fit-content;
  transition: color 0.2s, border-color 0.2s;
}
.link-arrow:hover { color: var(--gold); border-color: var(--gold); }


/* ─── PORTFOLIO ─── */
.portfolio-tabs {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}
.tab {
  background: none;
  border: 1px solid rgba(255,255,255,0.25);
  color: rgba(255,255,255,0.65);
  padding: 0.45rem 1.2rem;
  font-family: 'Noto Serif TC', serif;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: all 0.2s;
}
.tab:hover, .tab.active {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--navy-dark);
}

.portfolio-grid {
  columns: 4;
  column-gap: 6px;
  max-width: 1200px;
  margin: 0 auto;
}
.portfolio-item {
  break-inside: avoid;
  margin-bottom: 6px;
  overflow: hidden;
  cursor: pointer;
}
.portfolio-item img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.4s ease, opacity 0.3s;
}
.portfolio-item:hover img { transform: scale(1.04); opacity: 0.9; }


/* ─── PRICING ─── */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  max-width: 960px;
  margin: 0 auto 2.5rem;
  align-items: start;
}
.pricing-card {
  background: #fff;
  border: 1px solid var(--gold-light);
  padding: 2.5rem 1.75rem;
  text-align: center;
  position: relative;
}
.pricing-card--featured {
  background: var(--navy);
  border-color: var(--navy);
  color: #fff;
  transform: translateY(-10px);
  box-shadow: 0 16px 48px rgba(26,58,92,0.25);
}
.pricing-badge {
  position: absolute;
  top: -12px; left: 50%;
  transform: translateX(-50%);
  background: var(--gold);
  color: var(--navy-dark);
  font-size: 0.72rem;
  padding: 0.2rem 1rem;
  letter-spacing: 0.12em;
  white-space: nowrap;
}
.pricing-icon { font-size: 1.75rem; margin-bottom: 1rem; }
.pricing-card h3 {
  font-size: 1.1rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}
.price {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}
.pricing-card--featured .price { color: rgba(255,255,255,0.6); }
.price span { font-size: 2rem; color: var(--gold); }

.pricing-card ul { margin-bottom: 2rem; text-align: left; }
.pricing-card ul li {
  font-size: 0.84rem;
  padding: 0.4rem 0;
  border-bottom: 1px solid rgba(0,0,0,0.06);
  color: var(--text-muted);
}
.pricing-card--featured ul li {
  color: rgba(255,255,255,0.7);
  border-color: rgba(255,255,255,0.08);
}
.pricing-card ul li::before { content: '✓  '; color: var(--gold); }

.pricing-note {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  max-width: 580px;
  margin: 0 auto;
  line-height: 1.9;
}


/* ─── BOOKING ─── */
.booking-inner {
  text-align: center;
  max-width: 680px;
  margin: 0 auto;
}
.booking-inner h2 { margin-bottom: 0.75rem; }
.booking-inner > p {
  color: rgba(255,255,255,0.7);
  margin-top: 1.75rem;
  font-size: 0.9rem;
  line-height: 2;
}
.booking-line {
  margin: 2.5rem 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
}
.line-id {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.15rem;
  letter-spacing: 0.18em;
  color: var(--gold-light);
}
.booking-info {
  display: flex;
  justify-content: center;
  gap: 3rem;
  flex-wrap: wrap;
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(255,255,255,0.08);
}
.booking-info > div { text-align: center; }
.booking-info strong {
  display: block;
  color: var(--gold);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  margin-bottom: 0.3rem;
}
.booking-info span {
  color: rgba(255,255,255,0.65);
  font-size: 0.85rem;
}


/* ─── ABOUT ─── */
.about-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  max-width: 1100px;
  margin: 0 auto;
  align-items: start;
}
.about-text h3 {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  margin-bottom: 1.25rem;
}
.about-text > p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 2;
  margin-bottom: 1rem;
}
.about-features {
  margin-top: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}
.feature { display: flex; gap: 1rem; align-items: flex-start; }
.feature-icon { font-size: 1.1rem; flex-shrink: 0; margin-top: 0.15rem; }
.feature strong {
  display: block;
  font-size: 0.88rem;
  margin-bottom: 0.1rem;
}
.feature p { font-size: 0.82rem; color: var(--text-muted); margin: 0; }

.about-imgs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}
.about-imgs img:first-child {
  grid-column: 1 / -1;
  aspect-ratio: 16/9;
  height: auto;
}
.about-imgs img:not(:first-child) {
  aspect-ratio: 1;
  height: auto;
}


/* ─── FOOTER ─── */
footer {
  background: var(--navy-dark);
  color: rgba(255,255,255,0.4);
  text-align: center;
  padding: 3rem 2rem;
}
.footer-logo {
  height: 56px;
  width: auto;
  margin: 0 auto 1.5rem;
  object-fit: contain;
}
footer p { font-size: 0.78rem; margin-bottom: 0.75rem; }
.footer-links {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  font-size: 0.78rem;
  flex-wrap: wrap;
}
.footer-links a { color: rgba(255,255,255,0.4); transition: color 0.2s; }
.footer-links a:hover { color: var(--gold); }
.footer-links span { opacity: 0.3; }


/* ════════════════════════════════════
   RWD — Tablet landscape (≤1100px)
════════════════════════════════════ */
@media (max-width: 1100px) {
  .section { padding: 5rem 2.5rem; }

  /* Hero: hide outer 2 columns, show 3 */
  .hero-col:first-child,
  .hero-col:last-child { display: none; }
  .hero-collage { grid-template-columns: 1fr 1fr 1fr; }

  /* Services */
  .service-text { padding: 2.5rem 2rem; }

  /* Portfolio */
  .portfolio-grid { columns: 3; }

  /* About */
  .about-inner { gap: 2.5rem; }
}


/* ════════════════════════════════════
   RWD — Tablet portrait (≤768px)
════════════════════════════════════ */
@media (max-width: 768px) {

  /* ── Nav ── */
  #navbar { padding: 0.85rem 1.25rem; }
  .nav-toggle { display: flex; }

  .nav-links {
    position: fixed;
    top: 0; left: 0; right: 0;
    background: var(--navy-dark);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    padding: 6rem 2rem 3rem;
    height: 100dvh;
    transform: translateX(100%);
    transition: transform 0.35s ease;
    z-index: 105;
  }
  .nav-links.open { transform: translateX(0); }
  .nav-links a { font-size: 1.1rem; letter-spacing: 0.18em; }

  /* ── Hero ── */
  #hero { height: 100dvh; min-height: 500px; }
  .hero-collage { grid-template-columns: 1fr; }
  .hero-col { display: none; }
  .hero-col--center {
    display: flex;
    background: var(--navy);
    height: 100%;
    position: relative;
  }
  /* semi-transparent studio photo behind brand center */
  .hero-col--center::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url('../source/BT網站資料/環境圖/5M170904.jpg') center/cover no-repeat;
    opacity: 0.18;
  }
  .hero-brand { position: relative; z-index: 1; padding: 2rem; }
  .hero-logo { width: 160px; }
  .hero-tagline { font-size: 0.9rem; letter-spacing: 0.2em; }

  /* ── Sections ── */
  .section { padding: 4rem 1.25rem; }

  /* ── Services ── */
  .service-block,
  .service-block--reverse {
    grid-template-columns: 1fr;
  }
  .service-block--reverse .service-img,
  .service-block--reverse .service-text { order: unset; }
  .service-img { min-height: 280px; }
  .service-text { padding: 2rem 1.5rem; }
  .service-num { font-size: 2.5rem; }
  .service-text h3 { font-size: 1.2rem; }

  /* ── Portfolio ── */
  .portfolio-grid { columns: 2; column-gap: 5px; }
  .portfolio-tabs { gap: 0.5rem; }
  .tab { font-size: 0.78rem; padding: 0.4rem 0.9rem; }

  /* ── Pricing ── */
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    gap: 1.25rem;
  }
  .pricing-card--featured { transform: none; }

  /* ── Booking ── */
  .booking-inner { padding: 0 0.5rem; }
  .booking-info { gap: 1.5rem; flex-direction: column; align-items: center; }

  /* ── About ── */
  .about-inner { grid-template-columns: 1fr; gap: 2rem; }
  .about-imgs {
    grid-template-columns: 1fr 1fr;
  }
  .about-imgs img:first-child { grid-column: 1 / -1; }

  /* ── Section headings ── */
  .section-header h2,
  .booking-inner h2,
  .about-text .section-header h2 { font-size: 2rem; }
}


/* ════════════════════════════════════
   RWD — Mobile small (≤480px)
════════════════════════════════════ */
@media (max-width: 480px) {
  .section { padding: 3.5rem 1rem; }

  .hero-logo { width: 130px; }
  .hero-tagline { font-size: 0.8rem; letter-spacing: 0.15em; }
  .hero-ctas { gap: 0.6rem; }
  .btn { padding: 0.65rem 1.4rem; font-size: 0.8rem; }
  .btn--lg { padding: 0.85rem 2rem; font-size: 0.875rem; }

  .service-img { min-height: 240px; }
  .service-text { padding: 1.75rem 1.25rem; }

  .portfolio-grid { columns: 2; column-gap: 4px; }
  .portfolio-item { margin-bottom: 4px; }

  .pricing-grid { max-width: 100%; }
  .pricing-card { padding: 2rem 1.25rem; }

  .booking-inner h2 { font-size: 1.75rem; }
  .line-id { font-size: 0.95rem; letter-spacing: 0.1em; }

  .about-imgs { grid-template-columns: 1fr; }
  .about-imgs img:first-child { grid-column: auto; }

  .footer-links { flex-direction: column; gap: 0.5rem; }
  .footer-links span { display: none; }
}