/* ============================================
   First Chapter — Design Tokens & Base
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Alfa+Slab+One&display=swap');

:root {
  --ink: #0D2E33;
  --brand: #1F7580;
  --brand-soft: #7CA0A8;
  --brand-hover: #134751;
  --brand-light: #A8C4C9;
  --paper: #FAF7F2;
  --stone: #E8E4DD;
  --mute: #6E6E6E;
  --line: #D8D4CD;
  --white: #ffffff;
  --gold: #B08B54;
  --accent-gray: #7A7A7A;

  --font-display: 'Playfair Display', 'IBM Plex Sans Thai', serif;
  --font-sans: 'Inter', 'IBM Plex Sans Thai', system-ui, -apple-system, sans-serif;
  --font-thai: 'IBM Plex Sans Thai', 'Inter', sans-serif;

  --container: 1320px;
  --radius: 2px;
  --transition: 0.45s cubic-bezier(0.4, 0, 0.2, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: opacity var(--transition); }
a:hover { opacity: 0.7; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px;
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 500;
  color: var(--ink);
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.display-xl { font-size: clamp(3rem, 7vw, 6.5rem); font-weight: 400; letter-spacing: -0.02em; }
.display-lg { font-size: clamp(2.5rem, 5vw, 4.5rem); }
.display-md { font-size: clamp(2rem, 3.5vw, 3rem); }
.display-sm { font-size: clamp(1.5rem, 2.5vw, 2rem); }

.eyebrow {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--brand);
  font-weight: 600;
  display: inline-block;
  margin-bottom: 1.25rem;
}

.eyebrow::before {
  content: '— ';
  margin-right: 0.25rem;
}

.thai { font-family: var(--font-thai); }
.mute { color: var(--mute); }

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 2rem;
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-radius: var(--radius);
  transition: all var(--transition);
  cursor: pointer;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--ink);
  color: var(--paper);
}
.btn-primary:hover {
  background: var(--brand);
  opacity: 1;
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--ink);
  border-color: var(--ink);
}
.btn-outline:hover {
  background: var(--ink);
  color: var(--paper);
  opacity: 1;
}

.btn-outline-light {
  background: transparent;
  color: var(--paper);
  border-color: var(--paper);
}
.btn-outline-light:hover {
  background: var(--paper);
  color: var(--ink);
  opacity: 1;
}

.btn-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ink);
  border-bottom: 1px solid var(--ink);
  padding-bottom: 4px;
  transition: all var(--transition);
}
.btn-link:hover {
  color: var(--brand);
  border-color: var(--brand);
  opacity: 1;
  gap: 1rem;
}

.btn-arrow::after {
  content: '→';
  transition: transform var(--transition);
}
.btn-arrow:hover::after { transform: translateX(4px); }

/* ============================================
   Header / Navigation
   ============================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 20px 0;
  transition: all var(--transition);
  background: transparent;
}

.site-header.scrolled {
  background: rgba(250, 247, 242, 0.97);
  backdrop-filter: blur(12px);
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.site-header.light {
  background: rgba(250, 247, 242, 0.97);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.brand-logo {
  display: inline-block;
  width: 160px;
  height: 68px;
  background-image: url('../images/logo.png');
  background-size: contain;
  background-repeat: no-repeat;
  background-position: left center;
  font-size: 0;
  color: transparent;
  text-indent: -9999px;
  overflow: hidden;
  transition: opacity var(--transition);
}
.brand-logo:hover { opacity: 0.8; }
.brand-logo small { display: none; }

.primary-nav {
  display: flex;
  gap: 2.25rem;
  list-style: none;
}
.primary-nav > li { position: relative; }
.primary-nav > li > a {
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink);
  padding: 8px 0;
  display: inline-block;
}
.primary-nav > li > a:hover { color: var(--brand); opacity: 1; }

.nav-dropdown {
  position: absolute;
  top: 100%;
  left: -16px;
  background: var(--paper);
  min-width: 240px;
  padding: 16px 0;
  list-style: none;
  border: 1px solid var(--line);
  box-shadow: 0 12px 40px rgba(14, 26, 43, 0.08);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition);
}
.primary-nav > li:hover .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.nav-dropdown a {
  display: block;
  padding: 10px 24px;
  font-size: 0.85rem;
  color: var(--ink);
  transition: all 0.2s;
}
.nav-dropdown a:hover {
  background: var(--stone);
  color: var(--brand);
  padding-left: 28px;
  opacity: 1;
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.lang-toggle {
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--mute);
}
.lang-toggle .active { color: var(--ink); font-weight: 600; }
.nav-phone {
  font-size: 0.85rem;
  font-weight: 500;
  padding: 8px 18px;
  border: 1px solid var(--ink);
  border-radius: 2px;
  transition: all var(--transition);
}
.nav-phone:hover { background: var(--ink); color: var(--paper); opacity: 1; }

.hamburger {
  display: none;
  width: 32px;
  height: 24px;
  flex-direction: column;
  justify-content: space-between;
  z-index: 200;
}
.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--ink);
  transition: all var(--transition);
}
.hamburger.active span:nth-child(1) { transform: translateY(11px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-11px) rotate(-45deg); }

.mobile-nav {
  position: fixed;
  top: 0;
  right: -100%;
  width: 100%;
  max-width: 420px;
  height: 100vh;
  background: var(--paper);
  padding: 100px 32px 40px;
  overflow-y: auto;
  transition: right var(--transition);
  z-index: 150;
  border-left: 1px solid var(--line);
}
.mobile-nav.active { right: 0; }
.mobile-nav ul { list-style: none; }
.mobile-nav > ul > li {
  border-bottom: 1px solid var(--line);
  padding: 18px 0;
}
.mobile-nav > ul > li > a {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--ink);
}
.mobile-nav ul ul {
  padding-top: 12px;
  padding-left: 16px;
}
.mobile-nav ul ul li { padding: 6px 0; }
.mobile-nav ul ul a {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--mute);
}

/* ============================================
   Hero
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background:
    linear-gradient(135deg, #0D2E33 0%, #1F7580 45%, #2B8F9B 100%);
  color: var(--paper);
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(124,160,168,0.35) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(176,139,84,0.22) 0%, transparent 50%);
  z-index: 1;
}
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  z-index: 1;
  pointer-events: none;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 2;
  overflow: hidden;
}
.hero-bg .swiper {
  width: 100%;
  height: 100%;
  background: transparent;
}
/* Fallback if Swiper JS fails to init */
.hero-bg .swiper-wrapper {
  display: flex;
  width: 100%;
  height: 100%;
}
.hero-bg .swiper-slide {
  flex-shrink: 0;
  width: 100%;
  height: 100%;
  position: relative;
}
.hero-bg .swiper-slide:not(:first-child) { display: none; }
.hero-bg .swiper-initialized .swiper-slide { display: block; }
.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.55);
  background: linear-gradient(135deg, #0D2E33, #1F7580);
}

.hero-content {
  position: relative;
  z-index: 3;
  color: var(--paper);
  max-width: 1100px;
  padding-top: 80px;
}

.hero-eyebrow {
  color: var(--paper);
  opacity: 0.8;
  margin-bottom: 2rem;
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.75rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
}
.hero-eyebrow::before {
  content: '';
  width: 40px;
  height: 1px;
  background: var(--paper);
  display: inline-block;
}

.hero h1 {
  color: var(--paper);
  font-weight: 400;
  margin-bottom: 1.5rem;
}
.hero h1 em {
  font-style: italic;
  color: var(--brand-soft);
  font-weight: 300;
}

.hero-thai {
  font-family: var(--font-thai);
  font-size: clamp(1.1rem, 1.8vw, 1.5rem);
  color: var(--paper);
  opacity: 0.9;
  max-width: 680px;
  margin: 1.5rem 0 2.5rem;
  font-weight: 300;
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 4;
  font-size: 0.7rem;
  letter-spacing: 0.25em;
  color: var(--paper);
  text-transform: uppercase;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}
.hero-scroll::after {
  content: '';
  width: 1px;
  height: 40px;
  background: var(--paper);
  animation: scrollDown 2s ease-in-out infinite;
}
@keyframes scrollDown {
  0%, 100% { transform: scaleY(0.3); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
}

/* ============================================
   Sections
   ============================================ */
section { padding: 120px 0; }
.section-sm { padding: 80px 0; }
.section-lg { padding: 160px 0; }

.section-stone { background: var(--stone); }
.section-ink { background: var(--ink); color: var(--paper); }
.section-ink h1, .section-ink h2, .section-ink h3 { color: var(--paper); }
.section-ink .eyebrow { color: var(--brand-soft); }

.section-head {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: end;
  margin-bottom: 4rem;
}
.section-head.center { text-align: center; grid-template-columns: 1fr; max-width: 780px; margin-inline: auto; margin-bottom: 4rem; }
.section-head p { color: var(--mute); font-size: 1.05rem; max-width: 500px; }
.section-ink .section-head p { color: var(--stone); }

/* ============================================
   Page Hero (non-home)
   ============================================ */
.page-hero {
  padding: 200px 0 100px;
  background: var(--ink);
  color: var(--paper);
  position: relative;
  overflow: hidden;
}
.page-hero .eyebrow { color: var(--brand-soft); }
.page-hero h1 { color: var(--paper); }
.page-hero p { color: var(--stone); margin-top: 1.5rem; max-width: 720px; font-size: 1.1rem; }
.page-hero .breadcrumb {
  display: flex;
  gap: 0.5rem;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--brand-soft);
  margin-bottom: 2rem;
}
.page-hero .breadcrumb a:hover { color: var(--paper); opacity: 1; }

/* ============================================
   Stats Band
   ============================================ */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  padding: 80px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.stat-item {
  text-align: center;
  padding: 0 1rem;
  border-right: 1px solid var(--line);
}
.stat-item:last-child { border-right: none; }
.stat-value {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 4vw, 3.75rem);
  color: var(--ink);
  line-height: 1;
  margin-bottom: 0.75rem;
  font-weight: 400;
}
.stat-value sub {
  font-size: 0.5em;
  color: var(--brand);
  vertical-align: baseline;
  margin-left: 4px;
}
.stat-label {
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mute);
}

/* ============================================
   Services Grid
   ============================================ */
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.service-card {
  background: var(--paper);
  padding: 3.5rem 3rem;
  transition: all var(--transition);
  cursor: pointer;
  position: relative;
  min-height: 360px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.service-card:hover {
  background: var(--ink);
  color: var(--paper);
}
.service-card:hover h3, .service-card:hover .service-num { color: var(--paper); }
.service-card:hover p { color: var(--stone); }
.service-card:hover .btn-link { color: var(--paper); border-color: var(--paper); }

.service-num {
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--brand);
  letter-spacing: 0.1em;
  margin-bottom: 2.5rem;
  transition: color var(--transition);
}
.service-card h3 {
  font-size: 2rem;
  margin-bottom: 1.25rem;
  transition: color var(--transition);
}
.service-card p {
  color: var(--mute);
  font-size: 0.95rem;
  margin-bottom: 2rem;
  transition: color var(--transition);
}

/* ============================================
   Portfolio Grid
   ============================================ */
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.portfolio-grid.featured {
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.project-card {
  position: relative;
  overflow: hidden;
  cursor: pointer;
  background: linear-gradient(135deg, #1F7580 0%, #0D2E33 100%);
  aspect-ratio: 4/5;
  color: var(--paper);
}
.portfolio-grid.featured .project-card.wide {
  grid-column: span 2;
  aspect-ratio: 16/10;
}
.project-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 30% 20%, rgba(255,255,255,0.08) 0%, transparent 45%),
    radial-gradient(circle at 70% 80%, rgba(124,160,168,0.3) 0%, transparent 50%);
  z-index: 0;
}
.project-card.tall { aspect-ratio: 4/5; }

.project-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 1s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  z-index: 1;
}
.project-card:hover img { transform: scale(1.08); }
.project-card .project-tag,
.project-card h3,
.project-card .meta { position: relative; }

.project-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(13,46,51,0.25) 0%, rgba(13,46,51,0.55) 50%, rgba(13,46,51,0.92) 100%);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  color: var(--paper);
  transition: opacity var(--transition);
  z-index: 2;
}
.project-tag {
  font-size: 0.7rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--brand-soft);
  margin-bottom: 0.5rem;
  font-weight: 600;
}
.project-overlay h3 {
  color: var(--paper);
  font-size: 1.5rem;
  margin-bottom: 0.25rem;
}
.project-overlay .meta {
  font-size: 0.85rem;
  opacity: 0.8;
}

/* ============================================
   Process Steps
   ============================================ */
.process-steps {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 1rem;
  counter-reset: step;
}
.process-step {
  padding: 2rem 1rem;
  border-top: 2px solid var(--line);
  position: relative;
  counter-increment: step;
}
.process-step::before {
  content: "0" counter(step);
  font-family: var(--font-display);
  font-size: 0.9rem;
  color: var(--brand);
  letter-spacing: 0.1em;
  display: block;
  margin-bottom: 1rem;
}
.process-step h4 {
  font-size: 1rem;
  font-family: var(--font-sans);
  font-weight: 600;
  margin-bottom: 0.5rem;
}
.process-step p {
  font-size: 0.85rem;
  color: var(--mute);
  line-height: 1.5;
}
.section-ink .process-step { border-top-color: var(--brand-soft); }
.section-ink .process-step p { color: var(--stone); }

/* ============================================
   Client Logos Marquee
   ============================================ */
.clients {
  padding: 80px 0;
  background: var(--paper);
  overflow: hidden;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.clients-title {
  text-align: center;
  font-size: 0.75rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--mute);
  margin-bottom: 3rem;
}
.clients-track {
  display: flex;
  gap: 3.5rem;
  align-items: center;
  animation: marquee 40s linear infinite;
  white-space: nowrap;
}
@keyframes marquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}
.client-logo {
  flex-shrink: 0;
  width: 160px;
  height: 80px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: opacity var(--transition), filter var(--transition);
  opacity: 0.65;
  filter: grayscale(100%);
}
.client-logo img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  display: block;
}
.client-logo:hover {
  opacity: 1;
  filter: grayscale(0%);
}

/* ============================================
   Testimonial
   ============================================ */
.testimonial {
  text-align: center;
  max-width: 920px;
  margin: 0 auto;
}
.testimonial-quote {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(1.5rem, 2.5vw, 2.25rem);
  line-height: 1.4;
  color: var(--paper);
  margin-bottom: 2.5rem;
  font-weight: 300;
}
.testimonial-quote::before, .testimonial-quote::after { content: '"'; }
.testimonial-author {
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--brand-soft);
}

/* ============================================
   CTA Band
   ============================================ */
.cta-band {
  background: var(--ink);
  color: var(--paper);
  padding: 100px 0;
  text-align: center;
}
.cta-band h2 { color: var(--paper); margin-bottom: 1.5rem; }
.cta-band p { color: var(--stone); margin-bottom: 2.5rem; max-width: 620px; margin-inline: auto; }
.cta-band .btn-outline-light { margin-right: 0.75rem; }

/* ============================================
   Articles / Blog
   ============================================ */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}
.article-card {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  cursor: pointer;
}
.article-thumb {
  aspect-ratio: 4/3;
  overflow: hidden;
  background: linear-gradient(135deg, #7CA0A8 0%, #1F7580 100%);
  position: relative;
}
.article-thumb::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 30% 30%, rgba(255,255,255,0.15) 0%, transparent 50%),
    radial-gradient(circle at 70% 70%, rgba(13,46,51,0.3) 0%, transparent 50%);
}
.article-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.8s;
}
.article-card:hover .article-thumb img { transform: scale(1.05); }
.article-meta {
  display: flex;
  gap: 1rem;
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--brand);
}
.article-meta .date { color: var(--mute); }
.article-card h3 {
  font-size: 1.5rem;
  line-height: 1.3;
}
.article-card p {
  color: var(--mute);
  font-size: 0.95rem;
}

/* ============================================
   Values Blocks
   ============================================ */
.values-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--line);
}
.value-block {
  background: var(--paper);
  padding: 4rem 3rem;
  min-height: 320px;
}
.value-num {
  font-family: var(--font-display);
  font-size: 3.5rem;
  color: var(--brand);
  line-height: 1;
  margin-bottom: 2rem;
  font-weight: 300;
}
.value-block h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}
.value-block p {
  color: var(--mute);
  font-size: 0.95rem;
}

/* ============================================
   Timeline
   ============================================ */
.timeline {
  position: relative;
  padding: 60px 0;
  max-width: 900px;
  margin: 0 auto;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 120px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--line);
}
.timeline-item {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 3rem;
  padding: 2rem 0;
  position: relative;
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: 117px;
  top: 2.75rem;
  width: 8px;
  height: 8px;
  background: var(--brand);
  border-radius: 50%;
}
.timeline-year {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--brand);
  font-weight: 400;
  text-align: right;
}
.timeline-content h4 {
  font-size: 1.25rem;
  font-family: var(--font-sans);
  font-weight: 600;
  margin-bottom: 0.5rem;
}
.timeline-content p {
  color: var(--mute);
  font-size: 0.95rem;
}

/* ============================================
   Accordion / FAQ
   ============================================ */
.accordion { border-top: 1px solid var(--line); }
.accordion-item {
  border-bottom: 1px solid var(--line);
}
.accordion-head {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2rem 0;
  text-align: left;
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--ink);
  font-weight: 500;
  transition: color var(--transition);
}
.accordion-head:hover { color: var(--brand); }
.accordion-head .icon {
  width: 32px;
  height: 32px;
  border: 1px solid var(--line);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  flex-shrink: 0;
  margin-left: 1rem;
}
.accordion-item.open .accordion-head .icon {
  background: var(--ink);
  color: var(--paper);
  transform: rotate(45deg);
}
.accordion-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s ease;
}
.accordion-body-inner {
  padding: 0 0 2rem;
  color: var(--mute);
  font-size: 1rem;
  line-height: 1.7;
  max-width: 820px;
}
.accordion-body-inner ul { padding-left: 1.25rem; margin-top: 0.75rem; }
.accordion-body-inner li { margin-bottom: 0.5rem; }

/* ============================================
   Tabs
   ============================================ */
.tabs {
  display: flex;
  gap: 2.5rem;
  border-bottom: 1px solid var(--line);
  margin-bottom: 3rem;
  overflow-x: auto;
}
.tab-btn {
  padding: 1rem 0;
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mute);
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  white-space: nowrap;
  font-weight: 500;
  transition: all var(--transition);
}
.tab-btn.active { color: var(--ink); border-color: var(--ink); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ============================================
   Service Options (checkbox cards)
   ============================================ */
.service-options {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin-top: 0.5rem;
}
.service-option {
  position: relative;
  cursor: pointer;
  display: block;
}
.service-option input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}
.service-option-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 1rem 1.25rem;
  border: 1.5px solid var(--line);
  background: var(--paper);
  border-radius: 2px;
  transition: all var(--transition);
  position: relative;
  user-select: none;
}
.service-option-card::before {
  content: '';
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 18px;
  height: 18px;
  border: 1.5px solid var(--line);
  border-radius: 2px;
  background: var(--paper);
  transition: all var(--transition);
}
.service-option:hover .service-option-card {
  border-color: var(--brand-soft);
}
.service-option input:checked + .service-option-card {
  border-color: var(--brand);
  background: rgba(31, 117, 128, 0.04);
}
.service-option input:checked + .service-option-card::before {
  background: var(--brand);
  border-color: var(--brand);
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%23FAF7F2'><path d='M13.5 4.5 6 12 2.5 8.5l1.4-1.4L6 9.2l6.1-6.1z'/></svg>");
  background-size: 14px;
  background-position: center;
  background-repeat: no-repeat;
}
.service-option-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--ink);
  padding-right: 28px;
  line-height: 1.2;
}
.service-option-sub {
  font-size: 0.85rem;
  color: var(--mute);
}
@media (max-width: 640px) {
  .service-options { grid-template-columns: 1fr; }
}

/* ============================================
   Forms
   ============================================ */
.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}
.form-group { display: flex; flex-direction: column; }
.form-group.full { grid-column: 1 / -1; }
.form-group label {
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--mute);
  margin-bottom: 0.5rem;
  font-weight: 500;
}
.form-group input,
.form-group select,
.form-group textarea {
  font-family: inherit;
  font-size: 1rem;
  padding: 14px 16px;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  border-radius: 2px;
  transition: border-color var(--transition);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--brand);
}
.form-group textarea { min-height: 140px; resize: vertical; }

/* ============================================
   Footer
   ============================================ */
.site-footer {
  background: var(--ink);
  color: var(--stone);
  padding: 100px 0 40px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 4rem;
}
.footer-brand h3 {
  display: inline-block;
  width: 200px;
  height: 85px;
  background-image: url('../images/logo.png');
  background-size: contain;
  background-repeat: no-repeat;
  background-position: left center;
  font-size: 0;
  color: transparent;
  text-indent: -9999px;
  margin-bottom: 1.25rem;
  overflow: hidden;
  filter: brightness(0) invert(1) opacity(0.9);
}
.footer-brand p {
  color: var(--brand-soft);
  font-size: 0.95rem;
  line-height: 1.7;
  max-width: 280px;
  margin-bottom: 1.5rem;
}
.footer-social {
  display: flex;
  gap: 0.75rem;
}
.footer-social a {
  width: 40px;
  height: 40px;
  border: 1px solid var(--brand-soft);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--brand-soft);
  transition: all var(--transition);
}
.footer-social a:hover {
  background: var(--paper);
  color: var(--ink);
  border-color: var(--paper);
  opacity: 1;
}
.footer-col h4 {
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--paper);
  margin-bottom: 1.5rem;
  font-family: var(--font-sans);
  font-weight: 600;
}
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 0.75rem; }
.footer-col a {
  color: var(--brand-soft);
  font-size: 0.9rem;
  transition: color var(--transition);
}
.footer-col a:hover { color: var(--paper); opacity: 1; }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  padding-top: 2rem;
  border-top: 1px solid rgba(255,255,255,0.08);
  font-size: 0.8rem;
  color: var(--brand-soft);
}

/* ============================================
   Floating Buttons
   ============================================ */
.float-contact {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 50;
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: flex-end;
}
.float-btn {
  border-radius: 50%;
  color: var(--paper);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  position: relative;
  text-decoration: none;
}
.float-btn:hover { transform: translateY(-4px); opacity: 1; }

/* === PHONE BUTTON — bold, vivid orange, eye-catching === */
.float-btn.phone {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, #FF6B35 0%, #E84E1B 100%);
  box-shadow: 0 8px 24px rgba(232, 78, 27, 0.4);
  animation: phone-pulse 1.8s ease-in-out infinite, phone-wiggle 4s ease-in-out infinite;
}
.float-btn.phone:hover {
  background: linear-gradient(135deg, #FF7C4D 0%, #FF5B22 100%);
  animation: none;
  box-shadow: 0 12px 32px rgba(232, 78, 27, 0.55);
}
.float-btn.phone .phone-icon {
  width: 30px;
  height: 30px;
  color: #fff;
  display: block;
}
.float-btn.phone .phone-tooltip {
  position: absolute;
  right: calc(100% + 14px);
  top: 50%;
  transform: translateY(-50%) translateX(8px);
  background: #fff;
  color: #E84E1B;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 10px 16px;
  border-radius: 8px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition), transform var(--transition);
  box-shadow: 0 6px 18px rgba(232, 78, 27, 0.25);
  border: 1.5px solid rgba(232, 78, 27, 0.2);
}
.float-btn.phone .phone-tooltip strong {
  display: block;
  color: var(--ink);
  font-size: 0.9rem;
  margin-top: 2px;
  letter-spacing: 0.02em;
}
.float-btn.phone .phone-tooltip::after {
  content: '';
  position: absolute;
  left: 100%;
  top: 50%;
  transform: translateY(-50%);
  border: 7px solid transparent;
  border-left-color: #fff;
}
.float-btn.phone:hover .phone-tooltip {
  opacity: 1;
  transform: translateY(-50%) translateX(0);
}

@keyframes phone-pulse {
  0%, 100% {
    box-shadow: 0 8px 24px rgba(232, 78, 27, 0.4),
                0 0 0 0 rgba(232, 78, 27, 0.55);
  }
  50% {
    box-shadow: 0 8px 24px rgba(232, 78, 27, 0.4),
                0 0 0 16px rgba(232, 78, 27, 0);
  }
}
@keyframes phone-wiggle {
  0%, 88%, 100% { transform: rotate(0deg); }
  90% { transform: rotate(-12deg); }
  92% { transform: rotate(12deg); }
  94% { transform: rotate(-10deg); }
  96% { transform: rotate(10deg); }
  98% { transform: rotate(-4deg); }
}

/* === LINE BUTTON + persistent emotional chat bubble === */
.float-btn.line {
  width: 64px;
  height: 64px;
  background: #06C755;
  box-shadow: 0 8px 24px rgba(6, 199, 85, 0.4);
  animation: line-pulse 2.4s ease-in-out infinite;
}
.float-btn.line:hover {
  background: #05a348;
  animation: none;
}
.float-btn.line .line-icon {
  width: 36px;
  height: 36px;
  color: #fff;
  display: block;
}
@keyframes line-pulse {
  0%, 100% {
    box-shadow: 0 8px 24px rgba(6, 199, 85, 0.4),
                0 0 0 0 rgba(6, 199, 85, 0.55);
  }
  50% {
    box-shadow: 0 8px 24px rgba(6, 199, 85, 0.4),
                0 0 0 16px rgba(6, 199, 85, 0);
  }
}

/* === Persistent chat bubble — emotional CTA === */
.line-chat-bubble {
  position: absolute;
  right: calc(100% + 16px);
  top: 50%;
  transform: translateY(-50%);
  background: #fff;
  border: 1.5px solid rgba(6, 199, 85, 0.25);
  border-radius: 14px;
  padding: 12px 16px 12px 14px;
  min-width: 200px;
  max-width: 240px;
  white-space: normal;
  text-align: left;
  display: flex;
  align-items: center;
  gap: 10px;
  box-shadow: 0 10px 28px rgba(6, 199, 85, 0.18);
  opacity: 0;
  pointer-events: none;
  animation: bubble-show 0.6s ease-out 1.6s forwards,
             bubble-bob 3s ease-in-out 2.4s infinite;
}
.line-chat-bubble .bubble-emoji {
  font-size: 1.6rem;
  flex-shrink: 0;
  animation: bubble-emoji-wave 2.4s ease-in-out infinite;
}
.line-chat-bubble .bubble-text {
  font-size: 0.78rem;
  line-height: 1.4;
  color: var(--ink);
  font-family: var(--font-thai);
  letter-spacing: 0;
}
.line-chat-bubble .bubble-text strong {
  display: block;
  color: #06C755;
  font-weight: 700;
  font-size: 0.85rem;
  margin-bottom: 2px;
}
.line-chat-bubble::after {
  content: '';
  position: absolute;
  left: 100%;
  top: 50%;
  transform: translateY(-50%);
  border: 8px solid transparent;
  border-left-color: #fff;
}
.line-chat-bubble::before {
  content: '';
  position: absolute;
  left: calc(100% + 1px);
  top: 50%;
  transform: translateY(-50%);
  border: 9px solid transparent;
  border-left-color: rgba(6, 199, 85, 0.25);
  z-index: -1;
}
.float-btn.line:hover .line-chat-bubble {
  animation: bubble-show 0.3s ease-out forwards;
  border-color: rgba(6, 199, 85, 0.5);
  box-shadow: 0 12px 32px rgba(6, 199, 85, 0.3);
}

@keyframes bubble-show {
  from {
    opacity: 0;
    transform: translateY(-50%) translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateY(-50%) translateX(0);
  }
}
@keyframes bubble-bob {
  0%, 100% { transform: translateY(-50%) translateX(0); }
  50% { transform: translateY(-50%) translateX(-4px); }
}
@keyframes bubble-emoji-wave {
  0%, 60%, 100% { transform: rotate(0deg) scale(1); }
  70% { transform: rotate(-15deg) scale(1.1); }
  80% { transform: rotate(15deg) scale(1.1); }
  90% { transform: rotate(-8deg) scale(1.05); }
}

/* Mobile — hide chat bubble (too cramped), keep buttons */
@media (max-width: 768px) {
  .line-chat-bubble {
    display: none;
  }
  .float-btn.phone,
  .float-btn.line {
    width: 56px;
    height: 56px;
  }
  .float-btn.phone .phone-icon { width: 26px; height: 26px; }
  .float-btn.line .line-icon { width: 32px; height: 32px; }
}

.back-top {
  position: fixed;
  bottom: 32px;
  left: 32px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--paper);
  border: 1px solid var(--ink);
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
  z-index: 50;
}
.back-top.visible { opacity: 1; visibility: visible; }
.back-top:hover { background: var(--ink); color: var(--paper); opacity: 1; }

/* ============================================
   Case Study / Project Detail
   ============================================ */
.case-meta {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  padding: 3rem 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin: 3rem 0;
}
.case-meta-item dt {
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mute);
  margin-bottom: 0.5rem;
}
.case-meta-item dd {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--ink);
}

/* ============================================
   Split / Image Feature
   ============================================ */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
}
.split.reverse .split-img { order: 2; }
.split-img {
  aspect-ratio: 4/5;
  background: linear-gradient(135deg, #E8E4DD 0%, #7CA0A8 100%);
  overflow: hidden;
  position: relative;
}
.split-img::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 25% 25%, rgba(255,255,255,0.25) 0%, transparent 45%),
    radial-gradient(circle at 75% 75%, rgba(13,46,51,0.2) 0%, transparent 50%);
}
.split-img img { width: 100%; height: 100%; object-fit: cover; }
.split-content h2 { margin-bottom: 1.5rem; }
.split-content p { color: var(--mute); margin-bottom: 1.25rem; font-size: 1rem; line-height: 1.8; }

/* ============================================
   Image Placeholders (gradient fallbacks)
   ============================================ */
.placeholder-img {
  background: linear-gradient(135deg, var(--stone) 0%, var(--brand-soft) 50%, var(--ink) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--paper);
  font-family: var(--font-display);
  font-size: 1.5rem;
  width: 100%;
  height: 100%;
}

/* ============================================
   Utilities
   ============================================ */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.divider { height: 1px; background: var(--line); margin: 4rem 0; }

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
  .section-head { grid-template-columns: 1fr; gap: 1.5rem; }
  .services-grid { grid-template-columns: 1fr; }
  .portfolio-grid, .portfolio-grid.featured { grid-template-columns: 1fr 1fr; grid-auto-rows: auto; }
  .process-steps { grid-template-columns: repeat(3, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stat-item:nth-child(2n) { border-right: none; }
  .stat-item:nth-child(-n+2) { border-bottom: 1px solid var(--line); padding-bottom: 2rem; margin-bottom: 2rem; }
  .split { grid-template-columns: 1fr; gap: 2rem; }
  .split.reverse .split-img { order: 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .articles-grid { grid-template-columns: 1fr 1fr; }
  .values-grid { grid-template-columns: 1fr; }
  .case-meta { grid-template-columns: 1fr 1fr; gap: 1.5rem; }
}

@media (max-width: 768px) {
  section { padding: 80px 0; }
  .container { padding: 0 20px; }
  .primary-nav, .nav-phone, .lang-toggle { display: none; }
  .hamburger { display: flex; }
  .portfolio-grid, .portfolio-grid.featured { grid-template-columns: 1fr; }
  .process-steps { grid-template-columns: 1fr 1fr; }
  .articles-grid { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
  .timeline::before { left: 8px; }
  .timeline-item { grid-template-columns: 60px 1fr; gap: 1rem; }
  .timeline-item::before { left: 5px; }
  .timeline-year { text-align: left; font-size: 1.1rem; }
  .page-hero { padding: 140px 0 60px; }
  .display-xl { font-size: 2.5rem; }
  .hero-cta { flex-direction: column; align-items: flex-start; }
  .hero-cta .btn { width: 100%; justify-content: center; }
  .float-contact { bottom: 16px; right: 16px; }
  .back-top { bottom: 16px; left: 16px; }
}