/* ============================================
   SEREIN HOUSE — Premium Design System
   Refined Urban Wellness & Spa
   v2.0 — Art-directed refinement
   ============================================ */

/* ─── 1. Design Tokens ──────────────────── */
:root {
  --ivory: #F7F3EE;
  --stone: #EEEAE4;
  --sand: #E0D8CE;
  --taupe: #C4B5A5;
  --clay: #B8A898;
  --olive: #7A7A6E;
  --eucalyptus: #8A9189;
  --brown: #8B7B6B;
  --bronze: #9A8B7A;
  --charcoal: #3D3A36;
  --dark: #2C2926;

  --bg-primary: var(--ivory);
  --bg-alt: var(--stone);
  --bg-surface: var(--sand);
  --bg-dark: var(--charcoal);
  --text-primary: var(--dark);
  --text-secondary: #5A5550;
  --text-muted: #8A837C;
  --text-on-dark: var(--ivory);
  --border: #D5CBC0;
  --border-subtle: rgba(44, 41, 38, 0.06);

  --font-serif: 'Cormorant Garamond', Georgia, 'Times New Roman', serif;
  --font-sans: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --text-xs: 0.6875rem;
  --text-sm: 0.8125rem;
  --text-base: 0.9375rem;
  --text-md: 1.0625rem;
  --text-lg: 1.1875rem;
  --text-xl: 1.375rem;
  --text-2xl: 1.875rem;
  --text-3xl: 2.375rem;
  --text-4xl: 3rem;
  --text-5xl: 3.75rem;

  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 5.5rem;
  --space-5xl: 8rem;

  --container-sm: 680px;
  --container: 1040px;
  --container-lg: 1240px;
  --nav-height: 72px;
  --section-py: clamp(4.5rem, 9vw, 7.5rem);

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out: cubic-bezier(0.33, 1, 0.68, 1);
  --duration: 0.35s;
  --duration-slow: 0.7s;
  --duration-slower: 1.2s;
}

/* ─── 2. Reset & Base ───────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; text-size-adjust: 100%; }
body {
  font-family: var(--font-sans); font-size: var(--text-base);
  line-height: 1.65; color: var(--text-primary);
  background-color: var(--bg-primary); overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font: inherit; border: none; background: none; cursor: pointer; }
input, textarea { font: inherit; }

::selection { background: var(--sand); color: var(--dark); }

/* ─── 3. Typography ─────────────────────── */
h1, h2, h3, h4 {
  font-family: var(--font-serif); font-weight: 400;
  line-height: 1.15; letter-spacing: -0.015em; color: var(--text-primary);
}
h1 { font-size: clamp(2.25rem, 5vw, var(--text-5xl)); line-height: 1.06; font-weight: 300; }
h2 { font-size: clamp(1.75rem, 3.5vw, var(--text-4xl)); line-height: 1.1; }
h3 { font-size: clamp(1.375rem, 2.5vw, var(--text-2xl)); letter-spacing: -0.01em; }
h4 { font-size: var(--text-xl); letter-spacing: -0.005em; }
h5 { font-size: var(--text-lg); font-family: var(--font-sans); font-weight: 500; letter-spacing: 0; }
p { color: var(--text-secondary); max-width: 600px; }

.eyebrow {
  font-family: var(--font-sans); font-size: var(--text-xs);
  font-weight: 500; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--bronze); margin-bottom: var(--space-md);
  display: block;
}

.lead { font-size: var(--text-md); line-height: 1.72; color: var(--text-secondary); }

/* ─── 4. Layout ──────────────────────────── */
.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 var(--space-xl); }
.container--sm { max-width: var(--container-sm); }
.container--lg { max-width: var(--container-lg); }

section { padding: var(--section-py) 0; }
.section--alt { background-color: var(--bg-alt); }
.section--dark { background-color: var(--bg-dark); color: var(--text-on-dark); }
.section--dark h1, .section--dark h2, .section--dark h3, .section--dark h4 { color: var(--text-on-dark); }
.section--dark p { color: rgba(247, 243, 238, 0.6); }
.section--dark .eyebrow { color: var(--taupe); }

.grid { display: grid; gap: var(--space-xl); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.grid--wide { gap: var(--space-2xl); }

.text-center { text-align: center; }
.mx-auto { margin-left: auto; margin-right: auto; }

.section-header { text-align: center; margin-bottom: var(--space-2xl); }
.section-header h2 { margin-bottom: var(--space-md); }
.section-header p { margin: 0 auto; }

/* ─── 5. Navigation ──────────────────────── */
.site-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-height); display: flex; align-items: center;
  background-color: rgba(247, 243, 238, 0.95);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  transition: background-color var(--duration) var(--ease), box-shadow var(--duration) var(--ease);
}
.site-nav--transparent {
  background-color: transparent;
  backdrop-filter: none; -webkit-backdrop-filter: none;
}
.site-nav--scrolled, .site-nav--transparent.site-nav--scrolled {
  background-color: rgba(247, 243, 238, 0.92);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--border-subtle);
}

.site-nav .container { display: flex; align-items: center; justify-content: space-between; max-width: var(--container-lg); }

.site-nav__logo {
  font-family: var(--font-serif); font-size: var(--text-xl);
  font-weight: 500; letter-spacing: 0.03em; color: var(--text-primary); white-space: nowrap;
}
.site-nav--transparent .site-nav__logo { color: var(--text-on-dark); }
.site-nav--transparent.site-nav--scrolled .site-nav__logo { color: var(--text-primary); }

.site-nav__menu { display: flex; align-items: center; gap: clamp(1.25rem, 2.5vw, 2.5rem); }
.site-nav__link {
  font-size: var(--text-xs); font-weight: 400; letter-spacing: 0.04em;
  color: var(--text-muted); transition: color var(--duration) var(--ease);
  position: relative; padding: 2px 0;
}
.site-nav__link::after {
  content: ''; position: absolute; bottom: -2px; left: 0;
  width: 0; height: 1px; background-color: var(--bronze);
  transition: width var(--duration) var(--ease);
}
.site-nav__link:hover { color: var(--text-primary); }
.site-nav__link:hover::after { width: 100%; }

.site-nav--transparent .site-nav__link { color: rgba(247, 243, 238, 0.6); }
.site-nav--transparent .site-nav__link:hover { color: var(--text-on-dark); }
.site-nav--transparent.site-nav--scrolled .site-nav__link { color: var(--text-muted); }
.site-nav--transparent.site-nav--scrolled .site-nav__link:hover { color: var(--text-primary); }

.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 10px; margin-right: -10px; }
.nav-toggle span { display: block; width: 22px; height: 1.5px; background-color: var(--text-primary); transition: all var(--duration) var(--ease); }
.site-nav--transparent .nav-toggle span { background-color: var(--text-on-dark); }
.site-nav--transparent.site-nav--scrolled .nav-toggle span { background-color: var(--text-primary); }

/* Mobile nav */
.mobile-nav__overlay {
  position: fixed; inset: 0; background: rgba(44, 41, 38, 0.5); z-index: 199;
  opacity: 0; pointer-events: none; transition: opacity var(--duration-slow) var(--ease);
  backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px);
}
.mobile-nav__overlay--visible { opacity: 1; pointer-events: auto; }

.mobile-nav {
  position: fixed; top: 0; right: -100%; width: 100%; max-width: 380px;
  height: 100vh; height: 100dvh; background: var(--bg-primary); z-index: 200;
  padding: var(--space-3xl) var(--space-2xl); transition: right var(--duration-slow) var(--ease);
  overflow-y: auto;
}
.mobile-nav--open { right: 0; }
.mobile-nav__close {
  position: absolute; top: var(--space-lg); right: var(--space-xl);
  font-size: var(--text-2xl); color: var(--text-muted); line-height: 1;
  padding: 8px; transition: color var(--duration) var(--ease);
}
.mobile-nav__close:hover { color: var(--text-primary); }
.mobile-nav__links { display: flex; flex-direction: column; gap: var(--space-xl); margin-top: var(--space-3xl); }
.mobile-nav__link {
  font-family: var(--font-serif); font-size: var(--text-2xl); color: var(--text-primary);
  padding: 4px 0; transition: color var(--duration) var(--ease);
}
.mobile-nav__link:hover { color: var(--bronze); }
.mobile-nav__cta { margin-top: var(--space-2xl); }

/* ─── 6. Buttons ─────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--font-sans); font-size: var(--text-xs); font-weight: 500;
  letter-spacing: 0.1em; text-transform: uppercase;
  padding: 15px 34px; border: 1px solid transparent;
  transition: all var(--duration) var(--ease); cursor: pointer; white-space: nowrap;
  position: relative;
}
.btn--primary { background: var(--charcoal); color: var(--text-on-dark); border-color: var(--charcoal); }
.btn--primary:hover { background: var(--dark); border-color: var(--dark); transform: translateY(-1px); }
.btn--secondary { background: transparent; color: var(--text-primary); border-color: var(--border); }
.btn--secondary:hover { border-color: var(--charcoal); transform: translateY(-1px); }
.btn--light { background: rgba(247,243,238,0.1); color: var(--text-on-dark); border-color: rgba(247,243,238,0.2); }
.btn--light:hover { background: rgba(247,243,238,0.18); transform: translateY(-1px); }
.btn--sm { padding: 11px 22px; font-size: 0.625rem; }
.btn--dark-secondary { background: transparent; color: var(--text-on-dark); border-color: rgba(247,243,238,0.2); }
.btn--dark-secondary:hover { border-color: rgba(247,243,238,0.45); transform: translateY(-1px); }
.btn:focus-visible { outline: 2px solid var(--bronze); outline-offset: 3px; }
.btn-group { display: flex; gap: var(--space-md); flex-wrap: wrap; }

.link-arrow {
  font-size: var(--text-xs); font-weight: 500; letter-spacing: 0.06em;
  color: var(--bronze); display: inline-flex; align-items: center; gap: 6px;
  transition: gap var(--duration) var(--ease), color var(--duration) var(--ease);
  text-transform: uppercase;
}
.link-arrow:hover { gap: 10px; color: var(--text-primary); }
.link-arrow--light { color: rgba(247,243,238,0.5); }
.link-arrow--light:hover { color: var(--text-on-dark); }

/* ─── 7. Hero ────────────────────────────── */
.hero {
  position: relative; min-height: 100vh; min-height: 100dvh;
  display: flex; align-items: center; justify-content: center;
  text-align: center; overflow: hidden; background-color: var(--dark);
}
.hero__bg {
  position: absolute; inset: -4%; /* slight oversize for parallax */
  background-size: cover; background-position: center 40%;
  opacity: 0.55; will-change: transform;
  transition: opacity 1.8s var(--ease);
}
.hero__overlay {
  position: absolute; inset: 0;
  background: linear-gradient(
    180deg,
    rgba(44,41,38,0.35) 0%,
    rgba(44,41,38,0.05) 40%,
    rgba(44,41,38,0.15) 70%,
    rgba(44,41,38,0.5) 100%
  );
}
.hero__content {
  position: relative; z-index: 2;
  max-width: 640px; padding: 0 var(--space-xl);
}
.hero .eyebrow { color: rgba(247,243,238,0.45); margin-bottom: var(--space-lg); }
.hero h1 { color: var(--text-on-dark); margin-bottom: var(--space-lg); font-weight: 300; }
.hero p {
  color: rgba(247,243,238,0.6); font-size: var(--text-base); line-height: 1.72;
  margin: 0 auto var(--space-2xl); max-width: 480px;
}
.hero .btn-group { justify-content: center; }

.hero__scroll {
  position: absolute; bottom: var(--space-2xl); left: 50%;
  transform: translateX(-50%); z-index: 2;
  display: flex; flex-direction: column; align-items: center; gap: var(--space-sm);
  color: rgba(247,243,238,0.25);
}
.hero__scroll-line {
  width: 1px; height: 48px; background: rgba(247,243,238,0.12);
  position: relative; overflow: hidden;
}
.hero__scroll-line::after {
  content: ''; position: absolute; top: -100%; left: 0; width: 100%; height: 100%;
  background: rgba(247,243,238,0.4);
  animation: scrollDown 2.5s var(--ease-out) infinite;
}
@keyframes scrollDown { 0% { top: -100%; } 100% { top: 100%; } }

/* Page header */
.page-header {
  padding: calc(var(--nav-height) + var(--space-4xl)) 0 var(--space-3xl);
  background-color: var(--bg-alt); text-align: center;
  position: relative;
}
.page-header::after {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0;
  height: 1px; background: linear-gradient(90deg, transparent, var(--border), transparent);
}
.page-header .eyebrow { margin-bottom: var(--space-sm); }
.page-header h1 { margin-bottom: var(--space-lg); }
.page-header p { margin: 0 auto; max-width: 520px; }

/* ─── 8. Experience Cards ────────────────── */
.experience-card {
  position: relative; overflow: hidden;
  background: var(--bg-alt);
  transition: box-shadow var(--duration-slow) var(--ease);
}
.experience-card:hover { box-shadow: 0 12px 40px rgba(44,41,38,0.08); }
.experience-card__img-wrap { overflow: hidden; }
.experience-card__img {
  width: 100%; aspect-ratio: 4/3; object-fit: cover;
  transition: transform var(--duration-slower) var(--ease);
}
.experience-card:hover .experience-card__img { transform: scale(1.05); }
.experience-card__content { padding: var(--space-lg) var(--space-lg) var(--space-xl); }
.experience-card h3 { font-size: var(--text-lg); margin-bottom: 6px; }
.experience-card p {
  font-size: var(--text-xs); color: var(--text-muted);
  margin-bottom: var(--space-lg); line-height: 1.7;
}

/* ─── 9. Treatment Listings ──────────────── */
.treatment-section { margin-bottom: var(--space-3xl); }
.treatment-section__header { margin-bottom: var(--space-xl); }
.treatment-section__header h2 { font-size: clamp(1.625rem, 3vw, var(--text-3xl)); margin-bottom: var(--space-sm); }

.treatment-card { padding: var(--space-xl) 0; border-bottom: 1px solid var(--border-subtle); }
.treatment-card:first-child { padding-top: 0; }
.treatment-card__header {
  display: flex; justify-content: space-between; align-items: baseline;
  flex-wrap: wrap; gap: var(--space-sm); margin-bottom: var(--space-sm);
}
.treatment-card h3 { font-size: var(--text-lg); }
.treatment-card__meta { font-size: var(--text-xs); color: var(--text-muted); white-space: nowrap; letter-spacing: 0.02em; }
.treatment-card__desc { margin-bottom: var(--space-md); max-width: 520px; font-size: var(--text-sm); }
.treatment-card__tags { display: flex; flex-wrap: wrap; gap: 6px; }
.treatment-card__tag {
  font-size: 0.625rem; color: var(--text-muted); padding: 3px 10px;
  border: 1px solid var(--border-subtle); letter-spacing: 0.03em;
}

/* ─── 10. Membership Tiers ───────────────── */
.tier-card {
  padding: var(--space-2xl); background: var(--bg-primary);
  border: 1px solid var(--border); display: flex; flex-direction: column;
  transition: border-color var(--duration) var(--ease), box-shadow var(--duration) var(--ease);
}
.tier-card:hover { box-shadow: 0 8px 32px rgba(44,41,38,0.06); }
.tier-card--featured {
  border-color: var(--bronze); position: relative;
  background: linear-gradient(180deg, rgba(237,231,223,0.4) 0%, var(--bg-primary) 100%);
}
.tier-card--featured::before {
  content: 'Most Popular'; position: absolute; top: 0; left: var(--space-xl);
  font-family: var(--font-sans); font-size: 0.5625rem; font-weight: 500;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--text-on-dark); background: var(--bronze);
  padding: 5px 14px; transform: translateY(-50%);
}
.tier-card__name { font-family: var(--font-serif); font-size: var(--text-lg); margin-bottom: 4px; }
.tier-card__price { font-family: var(--font-serif); font-size: var(--text-3xl); margin-bottom: 2px; letter-spacing: -0.02em; }
.tier-card__price span { font-family: var(--font-sans); font-size: var(--text-xs); color: var(--text-muted); letter-spacing: 0; }
.tier-card__divider { width: 32px; height: 1px; background: var(--border); margin: var(--space-lg) 0; }
.tier-card__benefits { display: flex; flex-direction: column; gap: 10px; margin-bottom: var(--space-xl); flex: 1; }
.tier-card__benefit {
  font-size: var(--text-xs); color: var(--text-secondary);
  padding-left: var(--space-lg); position: relative; line-height: 1.6;
}
.tier-card__benefit::before { content: '—'; position: absolute; left: 0; color: var(--taupe); }
.tier-card__best-for { font-size: var(--text-xs); color: var(--text-muted); font-style: italic; margin-bottom: var(--space-lg); line-height: 1.6; }

/* ─── 11. Gift Options ───────────────────── */
.gift-option {
  padding: var(--space-lg); border: 1px solid var(--border-subtle);
  transition: border-color var(--duration) var(--ease), background-color var(--duration) var(--ease);
}
.gift-option:hover { border-color: var(--border); background-color: var(--bg-alt); }
.gift-option h4 { font-family: var(--font-serif); font-size: var(--text-lg); margin-bottom: 4px; }
.gift-option p { font-size: var(--text-xs); color: var(--text-muted); line-height: 1.65; }

/* ─── 12. Value Pillars ──────────────────── */
.pillar { padding: var(--space-lg) 0; }
.pillar h4 { font-family: var(--font-serif); font-size: var(--text-xl); margin-bottom: 6px; letter-spacing: -0.01em; }
.pillar p { font-size: var(--text-sm); color: var(--text-muted); line-height: 1.7; }

/* ─── 13. Split Layout ──────────────────── */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 0; align-items: stretch; }
.split--reverse .split__img { order: 2; }
.split--reverse .split__content { order: 1; }
.split__img { width: 100%; height: 100%; min-height: 520px; object-fit: cover; }
.split__content {
  padding: var(--space-3xl) var(--space-4xl);
  display: flex; flex-direction: column; justify-content: center;
}
.split__content h2 { margin-bottom: var(--space-md); }
.split__content .lead { margin-bottom: var(--space-md); }
.split__content p { margin-bottom: var(--space-lg); }

/* ─── 14. Image Band ─────────────────────── */
.img-band { width: 100%; overflow: hidden; position: relative; }
.img-band img { width: 100%; height: clamp(280px, 36vw, 520px); object-fit: cover; }

/* ─── 15. FAQ ────────────────────────────── */
.faq-item { border-bottom: 1px solid var(--border-subtle); }
.faq-item__question {
  width: 100%; display: flex; justify-content: space-between; align-items: center;
  padding: var(--space-lg) 0; font-family: var(--font-serif); font-size: var(--text-lg);
  text-align: left; color: var(--text-primary); cursor: pointer;
  transition: color var(--duration) var(--ease);
}
.faq-item__question:hover { color: var(--bronze); }
.faq-item__icon {
  font-size: var(--text-lg); color: var(--text-muted);
  transition: transform var(--duration) var(--ease), color var(--duration) var(--ease);
  flex-shrink: 0; margin-left: var(--space-xl); line-height: 1;
}
.faq-item--open .faq-item__icon { transform: rotate(45deg); color: var(--bronze); }
.faq-item__answer {
  max-height: 0; overflow: hidden;
  transition: max-height var(--duration-slow) var(--ease);
}
.faq-item--open .faq-item__answer { max-height: 400px; }
.faq-item__answer p { font-size: var(--text-sm); line-height: 1.75; padding-bottom: var(--space-lg); }

/* ─── 16. Journal Cards ──────────────────── */
.journal-card { overflow: hidden; }
.journal-card__img-wrap { overflow: hidden; margin-bottom: var(--space-md); }
.journal-card__img {
  width: 100%; aspect-ratio: 3/2; object-fit: cover;
  transition: transform var(--duration-slower) var(--ease);
}
.journal-card:hover .journal-card__img { transform: scale(1.05); }
.journal-card__cat {
  font-size: 0.5625rem; font-weight: 500; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--bronze); margin-bottom: 6px; display: block;
}
.journal-card h3 { font-size: var(--text-base); margin-bottom: 6px; line-height: 1.4; letter-spacing: -0.01em; }
.journal-card p { font-size: var(--text-xs); color: var(--text-muted); line-height: 1.65; }

/* ─── 17. Contact Info ───────────────────── */
.info-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-md); }
.info-block { padding: var(--space-xl); background: var(--bg-alt); transition: background-color var(--duration) var(--ease); }
.info-block:hover { background-color: var(--sand); }
.info-block h4 {
  font-family: var(--font-sans); font-size: 0.5625rem; font-weight: 500;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--bronze); margin-bottom: var(--space-sm);
}
.info-block p { font-size: var(--text-sm); color: var(--text-secondary); line-height: 1.75; }
.info-block a {
  color: var(--text-primary); text-decoration: underline;
  text-decoration-color: var(--border-subtle); text-underline-offset: 3px;
  transition: text-decoration-color var(--duration) var(--ease);
}
.info-block a:hover { text-decoration-color: var(--text-primary); }

/* ─── 18. Add-ons ────────────────────────── */
.addon-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 var(--space-3xl); }
.addon-item {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 10px 0; border-bottom: 1px solid var(--border-subtle); font-size: var(--text-xs);
}
.addon-item__name { color: var(--text-secondary); }
.addon-item__price { color: var(--text-muted); white-space: nowrap; }

/* ─── 19. Thermal Features ───────────────── */
.thermal-features { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-md); }
.thermal-feature {
  text-align: center; padding: var(--space-xl) var(--space-md);
  background: var(--bg-primary); border: 1px solid var(--border-subtle);
  transition: border-color var(--duration) var(--ease);
}
.thermal-feature:hover { border-color: var(--border); }
.thermal-feature__icon { font-size: var(--text-xl); color: var(--taupe); margin-bottom: var(--space-sm); display: block; }
.thermal-feature h4 { font-family: var(--font-serif); font-size: var(--text-base); margin-bottom: 4px; }
.thermal-feature p { font-size: var(--text-xs); color: var(--text-muted); margin: 0 auto; line-height: 1.6; }

.thermal-pricing { display: flex; gap: var(--space-md); justify-content: center; flex-wrap: wrap; }
.thermal-price-card {
  padding: var(--space-lg) var(--space-2xl); border: 1px solid var(--border-subtle);
  text-align: center; min-width: 180px;
  transition: border-color var(--duration) var(--ease);
}
.thermal-price-card:hover { border-color: var(--border); }
.thermal-price-card h4 { font-family: var(--font-serif); font-size: var(--text-sm); margin-bottom: 4px; color: var(--text-muted); }
.thermal-price-card .price { font-family: var(--font-serif); font-size: var(--text-2xl); color: var(--text-primary); letter-spacing: -0.02em; }

/* ─── 20. CTA Banner ─────────────────────── */
.cta-banner {
  background: linear-gradient(180deg, var(--charcoal) 0%, var(--dark) 100%);
  text-align: center; padding: var(--space-4xl) var(--space-xl);
  position: relative; overflow: hidden;
}
.cta-banner::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse at 50% 0%, rgba(154,139,122,0.08) 0%, transparent 70%);
}
.cta-banner h2 { color: var(--text-on-dark); margin-bottom: var(--space-md); position: relative; }
.cta-banner p { color: rgba(247,243,238,0.5); margin: 0 auto var(--space-2xl); max-width: 480px; position: relative; font-size: var(--text-sm); }
.cta-banner .btn-group { justify-content: center; position: relative; }

/* ─── 21. Footer ─────────────────────────── */
.site-footer {
  background: var(--dark); color: var(--text-on-dark);
  padding: var(--space-4xl) 0 var(--space-xl);
}
.site-footer .container { max-width: var(--container-lg); }
.site-footer__top {
  display: grid; grid-template-columns: 2.5fr 1fr 1fr 1fr;
  gap: var(--space-3xl); padding-bottom: var(--space-2xl);
  border-bottom: 1px solid rgba(247,243,238,0.06);
}
.site-footer__brand { max-width: 280px; }
.site-footer__logo {
  font-family: var(--font-serif); font-size: var(--text-lg); font-weight: 500;
  letter-spacing: 0.02em; color: var(--text-on-dark); display: inline-block; margin-bottom: var(--space-md);
}
.site-footer__tagline { font-size: var(--text-xs); color: rgba(247,243,238,0.35); line-height: 1.7; }
.site-footer__heading {
  font-family: var(--font-sans); font-size: 0.5625rem; font-weight: 500;
  letter-spacing: 0.14em; text-transform: uppercase; color: rgba(247,243,238,0.25);
  margin-bottom: var(--space-md);
}
.site-footer__links { display: flex; flex-direction: column; gap: 10px; }
.site-footer__link {
  font-size: var(--text-xs); color: rgba(247,243,238,0.45);
  transition: color var(--duration) var(--ease);
}
.site-footer__link:hover { color: var(--text-on-dark); }
.site-footer__bottom {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: var(--space-lg); font-size: 0.5625rem; color: rgba(247,243,238,0.18);
  letter-spacing: 0.02em;
}
.site-footer__motto {
  font-family: var(--font-serif); font-size: var(--text-xs);
  font-style: italic; color: rgba(247,243,238,0.25); letter-spacing: 0;
}

/* ─── 22. Scroll Reveal ──────────────────── */
.reveal {
  opacity: 0; transform: translateY(16px);
  transition: opacity var(--duration-slow) var(--ease-out), transform var(--duration-slow) var(--ease-out);
}
.reveal--visible { opacity: 1; transform: translateY(0); }
.reveal-group .reveal:nth-child(1) { transition-delay: 0s; }
.reveal-group .reveal:nth-child(2) { transition-delay: 0.08s; }
.reveal-group .reveal:nth-child(3) { transition-delay: 0.16s; }
.reveal-group .reveal:nth-child(4) { transition-delay: 0.24s; }

/* ─── 23. Focus & Accessibility ──────────── */
a:focus-visible { outline: 2px solid var(--bronze); outline-offset: 3px; border-radius: 1px; }
button:focus-visible { outline: 2px solid var(--bronze); outline-offset: 3px; }
.faq-item__question:focus-visible { outline: 2px solid var(--bronze); outline-offset: 2px; }

/* ─── 24. Utilities ──────────────────────── */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mt-2xl { margin-top: var(--space-2xl); }
.mb-2xl { margin-bottom: var(--space-2xl); }

/* ─── 25. Responsive ─────────────────────── */
@media (max-width: 1023px) {
  .site-nav__menu { display: none; }
  .nav-toggle { display: flex; }
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .split { grid-template-columns: 1fr; }
  .split--reverse .split__img { order: 0; }
  .split--reverse .split__content { order: 0; }
  .split__img { min-height: 360px; }
  .split__content { padding: var(--space-2xl) var(--space-xl); }
  .info-grid { grid-template-columns: 1fr; }
  .addon-list { grid-template-columns: 1fr; }
  .thermal-features { grid-template-columns: 1fr 1fr; }
  .site-footer__top { grid-template-columns: 1fr 1fr; gap: var(--space-2xl); }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .addon-list { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 767px) {
  :root { --nav-height: 60px; --section-py: clamp(3rem, 8vw, 5rem); }
  .container { padding: 0 var(--space-lg); }
  h1 { font-size: clamp(2rem, 8vw, 2.75rem); }
  h2 { font-size: clamp(1.5rem, 6vw, 2.25rem); }
  .hero { min-height: 92vh; }
  .hero p { font-size: var(--text-xs); }
  .hero__scroll { display: none; }
  .btn-group { flex-direction: column; align-items: stretch; }
  .btn-group .btn { text-align: center; padding: 14px 28px; }
  .page-header { padding: calc(var(--nav-height) + var(--space-2xl)) 0 var(--space-2xl); }
  .page-header p { font-size: var(--text-sm); }
  .split__content { padding: var(--space-xl) var(--space-lg); }
  .thermal-features { grid-template-columns: 1fr; }
  .thermal-pricing { flex-direction: column; align-items: stretch; }
  .thermal-price-card { min-width: auto; }
  .info-grid { gap: var(--space-sm); }
  .site-footer__top { grid-template-columns: 1fr; gap: var(--space-xl); }
  .site-footer__bottom { flex-direction: column; gap: var(--space-sm); text-align: center; }
  .section-header { margin-bottom: var(--space-xl); }
  .mobile-nav { padding: var(--space-2xl) var(--space-lg); }
  .mobile-nav__links { gap: var(--space-lg); }
  .mobile-nav__link { font-size: var(--text-xl); }
  .experience-card__content { padding: var(--space-md) var(--space-md) var(--space-lg); }
  .experience-card h3 { font-size: var(--text-base); }
  .tier-card { padding: var(--space-xl); }
}

@media (max-width: 374px) {
  :root { --section-py: 2.5rem; }
  .container { padding: 0 var(--space-md); }
  h1 { font-size: 1.75rem; }
}