/* ═══════════════════════════════════════════
   ESG ASIA — Modern Classical Design System
   ═══════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,600;0,700;1,400;1,600&family=Cormorant+Garamond:ital,wght@0,300;0,400;0,600;1,300;1,400&family=Jost:wght@300;400;500;600&display=swap');

/* ─── DESIGN TOKENS ──────────────────────── */
:root {
  /* Dark theme (default) */
  --bg:        #0D0D0D;
  --bg2:       #141414;
  --bg3:       #1A1A1A;
  --surface:   #1F1F1F;
  --border:    rgba(255,255,255,0.08);
  --border2:   rgba(255,255,255,0.14);
  --text:      #F0EDE8;
  --text2:     #A89F94;
  --text3:     #6B6460;
  --accent:    #C9A96E;
  --accent2:   #8FB89A;
  --nav-bg:    rgba(13,13,13,0.92);
  --shadow:    0 24px 64px rgba(0,0,0,0.5);
  --shadow-sm: 0 4px 20px rgba(0,0,0,0.3);

  /* Typography */
  --ff-display: 'Playfair Display', Georgia, serif;
  --ff-serif:   'Cormorant Garamond', Georgia, serif;
  --ff-sans:    'Jost', sans-serif;

  /* Spacing */
  --max-w: 1140px;
  --radius: 4px;
  --radius-lg: 10px;
}

[data-theme="light"] {
  --bg:        #F7F4EF;
  --bg2:       #EFEBE4;
  --bg3:       #E8E2D8;
  --surface:   #FFFFFF;
  --border:    rgba(0,0,0,0.08);
  --border2:   rgba(0,0,0,0.14);
  --text:      #1A1714;
  --text2:     #6B5F52;
  --text3:     #A89F94;
  --accent:    #B08C4E;
  --accent2:   #4A7A5A;
  --nav-bg:    rgba(247,244,239,0.94);
  --shadow:    0 24px 64px rgba(0,0,0,0.12);
  --shadow-sm: 0 4px 20px rgba(0,0,0,0.08);
}

/* ─── RESET ──────────────────────────────── */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; font-size:16px; }

body {
  font-family: var(--ff-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background 0.4s ease, color 0.4s ease;
  overflow-x: hidden;
}

img { display:block; max-width:100%; height:auto; }
a { text-decoration:none; color:inherit; }

/* ─── SCROLLBAR ──────────────────────────── */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 2px; }

/* ─── LAYOUT ─────────────────────────────── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 40px;
}
@media (max-width:768px) { .container { padding: 0 20px; } }

/* ─── NAVIGATION ─────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 500;
  background: var(--nav-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: background 0.4s, border-color 0.4s;
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 40px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--ff-display);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--text);
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.nav-logo span {
  font-family: var(--ff-sans);
  font-size: 0.55rem;
  font-weight: 300;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
}
.nav-logo-img {
  height: 44px;
  width: auto;
  display: block;
  object-fit: contain;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
  list-style: none;
}

.nav-links a {
  font-family: var(--ff-sans);
  font-size: 0.78rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text2);
  transition: color 0.3s;
  position: relative;
  padding-bottom: 2px;
}
.nav-links a::after {
  content:'';
  position: absolute;
  bottom: -2px; left: 0;
  width: 0; height: 1px;
  background: var(--accent);
  transition: width 0.35s ease;
}
.nav-links a:hover,
.nav-links a.active { color: var(--text); }
.nav-links a:hover::after,
.nav-links a.active::after { width: 100%; }

.nav-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

/* Theme toggle */
.theme-toggle {
  width: 44px; height: 24px;
  background: var(--bg3);
  border: 1px solid var(--border2);
  border-radius: 999px;
  cursor: pointer;
  position: relative;
  transition: background 0.4s;
  flex-shrink: 0;
}
.theme-toggle::after {
  content:'';
  position: absolute;
  top: 3px; left: 3px;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--accent);
  transition: transform 0.4s cubic-bezier(.68,-0.55,.27,1.55);
}
[data-theme="light"] .theme-toggle::after {
  transform: translateX(20px);
}

.nav-cta {
  font-family: var(--ff-sans);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--bg);
  background: var(--accent);
  padding: 10px 22px;
  border-radius: var(--radius);
  transition: all 0.3s;
  white-space: nowrap;
}
.nav-cta:hover {
  background: var(--text);
  color: var(--bg);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 22px; height: 1.5px;
  background: var(--text);
  transition: all 0.3s;
}
.hamburger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* Mobile menu */
.mobile-menu {
  display: none;
  flex-direction: column;
  gap: 0;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
  position: fixed;
  top: 72px; left: 0; right: 0;
  z-index: 499;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  font-family: var(--ff-sans);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text2);
  padding: 14px 40px;
  border-bottom: 1px solid var(--border);
  transition: color 0.3s, background 0.3s;
}
.mobile-menu a:hover { color: var(--accent); background: var(--surface); }
.mobile-menu a:last-child { border-bottom: none; }

/* ─── PAGE HEADER ────────────────────────── */
.page-header {
  padding: 160px 0 80px;
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content:'';
  position: absolute;
  top: 0; right: 0;
  width: 50%; height: 100%;
  background: linear-gradient(135deg, transparent 40%, rgba(201,169,110,0.04));
  pointer-events: none;
}

.page-header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 40px;
}

.page-eyebrow {
  font-family: var(--ff-sans);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}
.page-eyebrow::before {
  content:'';
  display: inline-block;
  width: 32px; height: 1px;
  background: var(--accent);
}

.page-header h1 {
  font-family: var(--ff-display);
  font-size: clamp(2.4rem, 5vw, 4rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.1;
  max-width: 700px;
}

.page-header p {
  font-family: var(--ff-serif);
  font-size: 1.2rem;
  font-weight: 300;
  color: var(--text2);
  max-width: 560px;
  margin-top: 18px;
  line-height: 1.7;
}

/* ─── SECTION ────────────────────────────── */
.section { padding: 100px 0; }
.section-sm { padding: 60px 0; }

.section-label {
  font-family: var(--ff-sans);
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}
.section-label::before {
  content:'';
  width: 28px; height: 1px;
  background: var(--accent);
  flex-shrink: 0;
}

.section-title {
  font-family: var(--ff-display);
  font-size: clamp(1.9rem, 3.5vw, 2.8rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.15;
  max-width: 580px;
}

.section-sub {
  font-family: var(--ff-serif);
  font-size: 1.1rem;
  font-weight: 300;
  color: var(--text2);
  max-width: 520px;
  margin-top: 14px;
  line-height: 1.75;
}

/* ─── DIVIDER ────────────────────────────── */
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border2) 30%, var(--border2) 70%, transparent);
  margin: 0 auto;
}

/* ─── BUTTONS ────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--ff-sans);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  padding: 14px 30px;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-gold {
  background: var(--accent);
  color: #fff;
}
.btn-gold:hover {
  background: var(--text);
  color: var(--bg);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border2);
}
.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.btn-text {
  background: transparent;
  color: var(--accent);
  padding: 0;
  letter-spacing: 0.14em;
  gap: 8px;
  font-size: 0.7rem;
}
.btn-text i { font-size: 0.65rem; transition: transform 0.3s; }
.btn-text:hover i { transform: translateX(4px); }

/* ─── CARDS ──────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
}
.card:hover {
  border-color: var(--border2);
  box-shadow: var(--shadow-sm);
  transform: translateY(-4px);
}

/* ─── FORM ELEMENTS ──────────────────────── */
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block;
  font-family: var(--ff-sans);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text2);
  margin-bottom: 8px;
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 13px 16px;
  color: var(--text);
  font-family: var(--ff-sans);
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.3s, box-shadow 0.3s;
  appearance: none;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(201,169,110,0.12);
}
.form-group textarea { height: 110px; resize: vertical; }
.form-group select option { background: var(--bg); }

/* ─── ANIMATIONS ─────────────────────────── */
@keyframes fadeUp {
  from { opacity:0; transform:translateY(28px); }
  to   { opacity:1; transform:translateY(0); }
}
@keyframes fadeIn {
  from { opacity:0; }
  to   { opacity:1; }
}

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ─── FLOATING BTNS ──────────────────────── */
.float-btns {
  position: fixed;
  bottom: 28px; right: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  z-index: 400;
}
.float-btn {
  width: 46px; height: 46px;
  border-radius: 50%;
  border: 1px solid var(--border2);
  background: var(--surface);
  color: var(--text2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  text-decoration: none;
  transition: all 0.3s;
  box-shadow: var(--shadow-sm);
}
.float-btn:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  transform: scale(1.08);
}

/* ─── FOOTER ─────────────────────────────── */
.footer {
  background: var(--bg2);
  border-top: 1px solid var(--border);
  padding: 70px 0 30px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 50px;
  padding-bottom: 50px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 30px;
}
.footer-brand .logo {
  font-family: var(--ff-display);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--text);
  margin-bottom: 14px;
}
.footer-logo-img {
  height: 48px;
  width: auto;
  display: block;
  object-fit: contain;
  margin-bottom: 14px;
}
.footer-brand p {
  font-family: var(--ff-serif);
  font-size: 0.95rem;
  font-weight: 300;
  color: var(--text2);
  line-height: 1.7;
  max-width: 240px;
}
.footer-col h5 {
  font-family: var(--ff-sans);
  font-size: 0.6rem;
  font-weight: 500;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--text3);
  margin-bottom: 20px;
}
.footer-col a {
  display: block;
  font-size: 0.88rem;
  color: var(--text2);
  margin-bottom: 10px;
  transition: color 0.3s;
}
.footer-col a:hover { color: var(--accent); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom p {
  font-family: var(--ff-sans);
  font-size: 0.72rem;
  color: var(--text3);
  letter-spacing: 0.06em;
}

.social-row {
  display: flex;
  gap: 10px;
  margin-top: 20px;
}
.social-btn {
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  transition: all 0.3s;
  text-decoration: none;
}
.social-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ─── RESPONSIVE ─────────────────────────── */
@media (max-width: 900px) {
  .nav-links, .nav-cta { display: none; }
  .hamburger { display: flex; }
  .nav-inner { padding: 0 20px; }
  .page-header-inner { padding: 0 20px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 36px; }
}
@media (max-width: 580px) {
  .page-header { padding: 130px 0 60px; }
  .section { padding: 70px 0; }
  .footer-grid { grid-template-columns: 1fr; }
  .float-btns { bottom: 16px; right: 16px; }
}