/* ============================================
   CORE+ — Base Styles & Design Tokens
   ============================================ */

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

/* ── Tokens ──────────────────────────────── */
:root {
  /* Colors */
  --green-deep:    #1a3a2e;
  --green-mid:     #2d5a45;
  --green-main:    #3a7a5a;
  --green-light:   #4e9a72;
  --green-soft:    #6bb890;
  --green-pale:    #a8d5bc;
  --green-mist:    #d4ede0;
  --green-foam:    #edf7f2;

  --cream:         #f5f0e8;
  --cream-light:   #faf7f2;
  --warm-white:    #fefcf8;

  --text-dark:     #1a2e25;
  --text-mid:      #3d5c48;
  --text-soft:     #6b8f7a;
  --text-muted:    #9dbdac;

  --gold-accent:   #c8a96e;
  --gold-light:    #e8d4a8;

  /* Typography */
  --font-display:  'Cormorant Garamond', Georgia, serif;
  --font-body:     'DM Sans', system-ui, sans-serif;

  /* Spacing */
  --space-xs:  0.5rem;
  --space-sm:  1rem;
  --space-md:  2rem;
  --space-lg:  4rem;
  --space-xl:  6rem;
  --space-2xl: 10rem;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 12px;
  --radius-lg: 24px;
  --radius-xl: 40px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm:  0 2px 12px rgba(26,58,46,0.08);
  --shadow-md:  0 8px 32px rgba(26,58,46,0.12);
  --shadow-lg:  0 20px 60px rgba(26,58,46,0.16);
  --shadow-glow: 0 0 40px rgba(74,154,114,0.25);

  /* Transitions */
  --ease-smooth: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur-fast:   0.2s;
  --dur-mid:    0.4s;
  --dur-slow:   0.8s;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  color: var(--text-dark);
  background: var(--warm-white);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }
a   { color: inherit; text-decoration: none; }
ul  { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }

/* ── Typography Scale ─────────────────────── */
.display-xl {
  font-family: var(--font-display);
  font-size: clamp(3rem, 7vw, 6rem);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.display-lg {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 400;
  line-height: 1.2;
}
.display-md {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 400;
  line-height: 1.3;
}
.heading {
  font-family: var(--font-body);
  font-size: clamp(1rem, 2vw, 1.2rem);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.label {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.body-lg { font-size: 1.1rem; line-height: 1.7; }
.body-sm { font-size: 0.875rem; line-height: 1.6; }

/* ── Buttons ──────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.85rem 2rem;
  border-radius: var(--radius-full);
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  transition: all var(--dur-mid) var(--ease-smooth);
  white-space: nowrap;
}
.btn-primary {
  background: var(--green-main);
  color: var(--cream);
  box-shadow: 0 4px 20px rgba(58,122,90,0.35);
}
.btn-primary:hover {
  background: var(--green-mid);
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(58,122,90,0.45);
}
.btn-outline {
  border: 1.5px solid var(--green-main);
  color: var(--green-main);
}
.btn-outline:hover {
  background: var(--green-foam);
  transform: translateY(-2px);
}
.btn-ghost {
  color: var(--green-main);
  padding-left: 0;
}
.btn-ghost:hover { gap: 1rem; }
.btn-ghost .arrow {
  width: 28px; height: 28px;
  border-radius: var(--radius-full);
  background: var(--green-mist);
  display: flex; align-items: center; justify-content: center;
  transition: all var(--dur-mid) var(--ease-smooth);
  font-size: 0.8rem;
}
.btn-ghost:hover .arrow { background: var(--green-pale); }

/* ── Navbar ───────────────────────────────── */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 1.2rem var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: all var(--dur-mid) var(--ease-smooth);
}
.navbar.scrolled {
  background: rgba(253,252,248,0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-sm);
  padding: 0.8rem var(--space-md);
}
.navbar-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  transition: transform 0.3s;
}
.navbar-logo img {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--green-main);
  box-shadow: 0 0 12px rgba(58, 122, 90, 0.5);
}
.navbar-logo .logo-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
  line-height: 1.1;
}
.navbar-logo .logo-name {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: 1px;
}
.navbar-logo .logo-main  { color: var(--green-deep); }
.navbar-logo .logo-accent {
  color: var(--green-main);
  text-shadow: 0 0 6px rgba(58,122,90,0.7), 0 0 12px rgba(58,122,90,0.4);
}
.navbar-logo .logo-subtitle {
  font-size: 0.65rem;
  color: var(--green-main);
  letter-spacing: 2px;
  margin-top: 3px;
  text-transform: uppercase;
  text-shadow: 0 0 6px rgba(58,122,90,0.5);
  font-family: var(--font-body);
}
.navbar-logo:hover { transform: scale(1.05); }
.navbar-nav {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}
.navbar-nav a {
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--text-mid);
  letter-spacing: 0.04em;
  transition: color var(--dur-fast);
  position: relative;
}
.navbar-nav a::after {
  content: '';
  position: absolute;
  bottom: -3px; left: 0; right: 0;
  height: 1.5px;
  background: var(--green-main);
  transform: scaleX(0);
  transition: transform var(--dur-mid) var(--ease-smooth);
}
.navbar-nav a:hover { color: var(--green-main); }
.navbar-nav a:hover::after { transform: scaleX(1); }
.navbar-cta { display: flex; align-items: center; gap: 0.75rem; }
.language-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .32rem;
  min-width: 68px;
  height: 36px;
  padding: 0 .65rem;
  border: 1px solid rgba(58,122,90,.35);
  border-radius: var(--radius-full);
  background: rgba(254,252,248,.78);
  color: var(--text-muted);
  font-size: .7rem;
  font-weight: 500;
  letter-spacing: .08em;
  transition: border-color var(--dur-fast), background var(--dur-fast);
}
.language-toggle:hover { border-color: var(--green-main); background: var(--green-foam); }
.language-toggle i { width: 1px; height: 12px; background: var(--green-pale); }
.language-toggle [data-lang] { transition: color var(--dur-fast); }
.language-toggle [data-lang].active { color: var(--green-main); font-weight: 600; }
.language-toggle-sidebar {
  width: 100%;
  margin-bottom: .75rem;
  background: var(--green-foam);
}
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}
.menu-toggle span {
  display: block;
  width: 22px; height: 1.5px;
  background: var(--text-dark);
  transition: all var(--dur-mid) var(--ease-smooth);
}

/* ── Section Wrapper ──────────────────────── */
.section {
  padding: var(--space-xl) var(--space-md);
  max-width: 1200px;
  margin: 0 auto;
}
.section-full {
  padding: var(--space-xl) var(--space-md);
}
.section-label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}
.section-label::before {
  content: '';
  width: 32px; height: 1.5px;
  background: var(--green-soft);
}

/* ── Card ─────────────────────────────────── */
.card {
  background: var(--warm-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--dur-mid) var(--ease-smooth);
  border: 1px solid rgba(168,213,188,0.3);
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}

/* ── Footer ───────────────────────────────── */
.footer {
  background: var(--green-deep);
  padding: 1.25rem var(--space-md) 0.75rem;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-nav {
  display: flex;
  gap: 1.75rem;
  margin-left: auto;
}
.footer-nav a {
  font-size: .825rem;
  color: var(--green-pale);
  transition: color var(--dur-fast);
}
.footer-nav a:hover { color: var(--cream); }
.footer-copy {
  max-width: 1200px;
  margin: 0.6rem auto 0;
  display: block;
  text-align: center;
  font-size: .78rem;
  color: var(--green-pale);
}

/* ── Divider ──────────────────────────────── */
.divider {
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, var(--green-soft), transparent);
  margin: var(--space-sm) 0;
}

/* ── Utility ──────────────────────────────── */
.text-green   { color: var(--green-main); }
.text-soft    { color: var(--text-soft); }
.text-muted   { color: var(--text-muted); }
.text-cream   { color: var(--cream); }
.bg-foam      { background: var(--green-foam); }
.bg-mist      { background: var(--green-mist); }
.bg-deep      { background: var(--green-deep); }
.italic       { font-style: italic; }
.centered     { text-align: center; }

/* ── Animations ───────────────────────────── */
.fade-up {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity var(--dur-slow) var(--ease-smooth),
              transform var(--dur-slow) var(--ease-smooth);
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}
.fade-in {
  opacity: 0;
  transition: opacity var(--dur-slow) var(--ease-smooth);
}
.fade-in.visible { opacity: 1; }
.scale-in {
  opacity: 0;
  transform: scale(0.92);
  transition: opacity var(--dur-slow) var(--ease-smooth),
              transform var(--dur-slow) var(--ease-smooth);
}
.scale-in.visible { opacity: 1; transform: scale(1); }

/* ── Responsive ───────────────────────────── */
@media (max-width: 768px) {
  .navbar-nav { display: none; }
  .navbar-cta .btn-outline { display: none; }
  .menu-toggle { display: flex; }
}

/* ── Sidebar (base — mọi breakpoint) ─────── */
.sidebar-backdrop {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.22);
  opacity: 0; pointer-events: none;
  transition: opacity 0.25s;
  z-index: 2999; /* above most site layers */
}
.sidebar-backdrop.open { opacity: 1; pointer-events: all; }

.sidebar {
  position: fixed;
  top: 0; right: 0;
  height: 100svh;
  width: min(320px, 88vw);
  background: rgba(254,252,248,0.98);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: -18px 0 60px rgba(0,0,0,0.14);
  transform: translateX(105%);   /* hidden by default */
  transition: transform 0.32s cubic-bezier(0.2,0.9,0.2,1);
  z-index: 3000; /* ensure sits above navbar and other elements */
  display: flex; flex-direction: column;
  overflow: hidden;
  pointer-events: auto;
}
.sidebar.open { transform: translateX(0); }

.sidebar-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1.1rem 1.5rem;
  border-bottom: 1px solid rgba(0,0,0,0.06);
  flex-shrink: 0;
}
.sidebar-brand { display: flex; align-items: center; gap: 0.75rem; }
.sidebar-brand-img {
  width: 38px; height: 38px; border-radius: 50%;
  object-fit: cover; border: 2px solid var(--green-main);
}
.sidebar-brand-name {
  font-family: var(--font-display);
  font-size: 1.15rem; font-weight: 600; color: var(--green-deep);
}
.sidebar-brand-name .accent { color: var(--green-main); }

.sidebar-close {
  width: 36px; height: 36px; border: none; background: transparent;
  color: var(--text-mid); cursor: pointer; border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem; transition: background 0.2s;
  z-index: 3001; /* sit above the sidebar panel */
  pointer-events: auto;
}
.sidebar-close:hover { background: rgba(0,0,0,0.06); }

.sidebar-nav-links {
  display: flex; flex-direction: column;
  padding: 1.25rem 1.5rem; gap: 0;
  flex: 1; overflow-y: auto;
}
.sidebar-nav-links a {
  font-family: var(--font-display);
  font-size: 1.65rem; font-weight: 500; color: var(--green-deep);
  padding: 0.65rem 0;
  border-bottom: 1px solid rgba(0,0,0,0.05);
  text-decoration: none;
  transition: color 0.2s, padding-left 0.2s; display: block;
}
.sidebar-nav-links a:last-child { border-bottom: none; }
.sidebar-nav-links a:hover { color: var(--green-main); padding-left: 0.5rem; }

.sidebar-cta-wrap { padding: 1rem 1.5rem 2rem; flex-shrink: 0; }
.sidebar-cta-wrap .btn { width: 100%; justify-content: center; }

/* ── Floating Action Button (FAB) — Zalo + Phone */
.fab {
  position: fixed;
  right: 18px;
  bottom: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
  z-index: 4000;
}
.fab-btn {
  width: 52px; height: 52px; border-radius: 999px;
  display: inline-flex; align-items: center; justify-content: center;
  color: #fff; background: #222; box-shadow: 0 8px 24px rgba(0,0,0,0.18);
  text-decoration: none; transition: transform 0.18s ease, opacity 0.18s ease;
}
.fab-btn:active { transform: scale(0.96); }
.fab .fab-sub { opacity: 0; transform: translateY(8px) scale(0.95); pointer-events: none; }
.fab.open .fab-sub { opacity: 1; transform: translateY(0) scale(1); pointer-events: auto; }
.fab .fab-zalo { background: #1ea1f1; }
.fab .fab-phone { background: #e34b3a; }
.fab .fab-main {
  width: 64px; height: 64px; background: var(--green-main); font-size: 24px;
  display: inline-flex; align-items: center; justify-content: center;
  box-shadow: 0 8px 24px rgba(58,122,90,0.28);
}
.fab .fab-tip { font-size: 0.85rem; color: var(--text-dark); background: var(--cream); padding: 0.4rem 0.6rem; border-radius: 8px; box-shadow: 0 6px 18px rgba(0,0,0,0.12); }

@media (min-width: 900px) {
  .fab { right: 28px; bottom: 28px; }
}