/* ============================================================
   ART DIRECTION: Clinical x Performance — Chiropractic B2B
   Palette: Warm neutral surfaces, teal accent (trust + health)
   Typography: Zodiak (display serif) + General Sans (body)
   Density: Balanced — generous hero, efficient content sections
   ============================================================ */

:root, [data-theme="light"] {
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);

  --space-1: 0.25rem; --space-2: 0.5rem;  --space-3: 0.75rem;
  --space-4: 1rem;    --space-5: 1.25rem; --space-6: 1.5rem;
  --space-8: 2rem;    --space-10: 2.5rem; --space-12: 3rem;
  --space-16: 4rem;   --space-20: 5rem;   --space-24: 6rem;

  /* Surfaces — warm beige */
  --color-bg:             #f7f6f2;
  --color-surface:        #fcfbf8;
  --color-surface-2:      #f1eee8;
  --color-surface-offset: #ece8e0;
  --color-divider:        #dfdad1;
  --color-border:         #d5d0c8;

  /* Text */
  --color-text:         #26231d;
  --color-text-muted:   #67635d;
  --color-text-faint:   #8d887f;
  --color-text-inverse: #faf8f4;

  /* Primary — Hydra Teal */
  --color-primary:           #0b6b70;
  --color-primary-hover:     #084e52;
  --color-primary-highlight: #d8e6e4;

  --color-success: #437a22;

  --radius-sm:   0.375rem;
  --radius-md:   0.5rem;
  --radius-lg:   0.875rem;
  --radius-xl:   1.25rem;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px oklch(0.2 0.01 80 / 0.08);
  --shadow-md: 0 4px 16px oklch(0.2 0.01 80 / 0.08), 0 20px 48px oklch(0.2 0.01 80 / 0.06);

  --transition: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  --font-body:    'General Sans', Inter, system-ui, sans-serif;
  --font-display: 'Zodiak', Georgia, 'Times New Roman', serif;

  --content-default: 1180px;
  --content-narrow:  680px;
}

[data-theme="dark"] {
  --color-bg:             #171614;
  --color-surface:        #1e1d1a;
  --color-surface-2:      #252320;
  --color-surface-offset: #2d2a26;
  --color-divider:        #2d2a26;
  --color-border:         #3c3935;
  --color-text:           #d6d2ca;
  --color-text-muted:     #aca79f;
  --color-text-faint:     #7e7a73;
  --color-text-inverse:   #171614;
  --color-primary:        #58a0ab;
  --color-primary-hover:  #79b3bb;
  --color-primary-highlight: #1d3335;
  --color-success:        #88bf63;
  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.25);
  --shadow-md: 0 4px 16px oklch(0 0 0 / 0.3), 0 20px 48px oklch(0 0 0 / 0.25);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:             #171614;
    --color-surface:        #1e1d1a;
    --color-surface-2:      #252320;
    --color-surface-offset: #2d2a26;
    --color-divider:        #2d2a26;
    --color-border:         #3c3935;
    --color-text:           #d6d2ca;
    --color-text-muted:     #aca79f;
    --color-text-faint:     #7e7a73;
    --color-text-inverse:   #171614;
    --color-primary:        #58a0ab;
    --color-primary-hover:  #79b3bb;
    --color-primary-highlight: #1d3335;
    --color-success:        #88bf63;
    --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.25);
    --shadow-md: 0 4px 16px oklch(0 0 0 / 0.3), 0 20px 48px oklch(0 0 0 / 0.25);
  }
}

/* ===================== BASE RESET ===================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: var(--space-20);
}
body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.65;
  background: var(--color-bg);
  color: var(--color-text);
}
img, svg, video { display: block; max-width: 100%; }
ul[role="list"], ol[role="list"] { list-style: none; }
input, button, textarea, select { font: inherit; color: inherit; }
h1, h2, h3, h4 { text-wrap: balance; line-height: 1.1; }
p, li { text-wrap: pretty; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; background: none; border: none; }
::selection { background: color-mix(in oklab, var(--color-primary) 22%, transparent); }
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}
a, button, [role="button"], input, select, textarea {
  transition: color var(--transition), background var(--transition),
    border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}
.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;
}

/* ===================== LAYOUT ===================== */
.container {
  width: min(calc(100% - 2rem), var(--content-default));
  margin-inline: auto;
}
.container--narrow {
  width: min(calc(100% - 2rem), var(--content-narrow));
  margin-inline: auto;
}

/* ===================== SKIP LINK ===================== */
.skip-link {
  position: absolute; left: 1rem; top: -3rem; z-index: 200;
  background: var(--color-primary); color: var(--color-text-inverse);
  padding: 0.75rem 1.25rem; border-radius: var(--radius-full);
  font-size: var(--text-sm); font-weight: 600;
  transition: top var(--transition);
}
.skip-link:focus { top: 1rem; }

/* ===================== HEADER ===================== */
.site-header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(14px) saturate(160%);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  background: color-mix(in oklab, var(--color-bg) 85%, transparent);
  border-bottom: 1px solid color-mix(in oklab, var(--color-text) 8%, transparent);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--space-4); min-height: 4.5rem;
}
.brand {
  display: flex; align-items: center; gap: 0.8rem;
  font-size: var(--text-sm); font-weight: 600; letter-spacing: -0.01em;
}
.brand__logo { width: 2.1rem; height: 2.1rem; flex-shrink: 0; color: var(--color-primary); }
.header-nav { display: flex; align-items: center; gap: 0.5rem; }
.btn-ghost {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 44px; padding: 0.6rem 1rem; border-radius: var(--radius-full);
  font-size: var(--text-sm); font-weight: 500; color: var(--color-text-muted);
}
.btn-ghost:hover { background: var(--color-surface-2); color: var(--color-text); }
.theme-btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 44px; min-width: 44px; border-radius: var(--radius-full);
  border: 1px solid var(--color-border); background: var(--color-surface);
  color: var(--color-text-muted);
}
.theme-btn:hover { background: var(--color-surface-2); color: var(--color-text); }
.btn-primary {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 44px; padding: 0.75rem 1.35rem; border-radius: var(--radius-full);
  background: var(--color-primary); color: var(--color-text-inverse);
  font-size: var(--text-sm); font-weight: 600; letter-spacing: -0.01em;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover { background: var(--color-primary-hover); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-primary:active { transform: translateY(0); }
.btn-secondary {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 44px; padding: 0.75rem 1.35rem; border-radius: var(--radius-full);
  border: 1px solid var(--color-border); background: var(--color-surface);
  font-size: var(--text-sm); font-weight: 600;
}
.btn-secondary:hover { background: var(--color-surface-2); border-color: color-mix(in oklab, var(--color-text) 20%, transparent); }

/* ===================== HERO ===================== */
.hero {
  padding: clamp(4.5rem, 8vw, 8rem) 0 clamp(3rem, 5vw, 5rem);
}
.hero__grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(var(--space-8), 5vw, var(--space-16));
  align-items: center;
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.4rem 0.9rem; border-radius: var(--radius-full);
  background: var(--color-primary-highlight); color: var(--color-primary);
  font-size: var(--text-xs); font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.09em;
  margin-bottom: var(--space-5);
}
.eyebrow__dot {
  width: 6px; height: 6px; border-radius: 50%; background: var(--color-primary);
  animation: pulse 2.2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}
.hero__heading {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  max-width: 13ch;
  margin-bottom: var(--space-5);
  letter-spacing: -0.03em;
}
.hero__heading em { font-style: italic; color: var(--color-primary); }
.hero__copy p { color: var(--color-text-muted); max-width: 58ch; line-height: 1.7; }
.hero__copy p + p { margin-top: var(--space-3); }
.hero__actions {
  display: flex; flex-wrap: wrap; gap: var(--space-3);
  margin-top: var(--space-6);
}
.hero__stats {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3); margin-top: var(--space-8);
}
.stat-card {
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}
.stat-card__value {
  display: block; font-size: var(--text-xl); font-family: var(--font-display);
  letter-spacing: -0.03em; line-height: 1.1; margin-bottom: 0.25rem;
}
.stat-card__label { color: var(--color-text-muted); font-size: var(--text-sm); }

/* HERO PANEL */
.hero__panel {
  background: linear-gradient(155deg,
    color-mix(in oklab, var(--color-surface) 80%, white 20%),
    var(--color-surface-2)
  );
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: clamp(var(--space-6), 3vw, var(--space-8));
  box-shadow: var(--shadow-md);
  position: relative; overflow: hidden;
}
.hero__panel::before {
  content: ""; position: absolute;
  right: -4rem; top: -4rem;
  width: 15rem; height: 15rem; border-radius: 50%;
  background: color-mix(in oklab, var(--color-primary) 14%, transparent);
  filter: blur(24px); pointer-events: none;
}
.panel__label {
  font-size: var(--text-xs); font-weight: 700; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--color-text-faint);
  margin-bottom: var(--space-4);
}
.flow-step {
  display: grid; grid-template-columns: 2.2rem 1fr; gap: 0.85rem;
  align-items: start; padding: var(--space-4) 0; position: relative; z-index: 1;
}
.flow-step + .flow-step { border-top: 1px solid var(--color-divider); }
.flow-badge {
  width: 2.2rem; height: 2.2rem; border-radius: 50%; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  background: var(--color-primary); color: var(--color-text-inverse);
  font-size: var(--text-xs); font-weight: 700; margin-top: 0.15rem;
}
.flow-step h3 {
  font-size: var(--text-base); font-weight: 600; margin-bottom: 0.3rem;
}
.flow-step p { font-size: var(--text-sm); color: var(--color-text-muted); max-width: 36ch; }
.panel__arrow {
  display: flex; align-items: center; justify-content: center;
  padding: var(--space-3) 0; color: var(--color-primary);
}

/* ===================== SECTIONS — SHARED ===================== */
section { padding: clamp(3rem, 6vw, 6rem) 0; }
.section-label {
  display: block; font-size: var(--text-xs); font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.09em; color: var(--color-primary);
  margin-bottom: var(--space-3);
}
.section-heading {
  font-family: var(--font-display); font-size: var(--text-xl);
  max-width: 15ch; margin-bottom: var(--space-4); letter-spacing: -0.03em;
}
.section-subtext { color: var(--color-text-muted); max-width: 60ch; }

/* ===================== PROBLEM SECTION ===================== */
.problem-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-4);
  margin-top: var(--space-8);
}
.problem-card {
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
}
.problem-card__icon {
  width: 2.5rem; height: 2.5rem; color: var(--color-text-faint); margin-bottom: var(--space-4);
}
.problem-card h3 { font-size: var(--text-base); font-weight: 600; margin-bottom: 0.5rem; }
.problem-card p { color: var(--color-text-muted); font-size: var(--text-sm); }

/* ===================== VALUE SECTION ===================== */
.value-grid {
  display: grid; grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(var(--space-8), 5vw, var(--space-12));
  align-items: start; margin-top: var(--space-8);
}
.tick-list { list-style: none; display: grid; gap: 0.9rem; margin-top: var(--space-6); }
.tick-list li {
  display: grid; grid-template-columns: 1.25rem 1fr;
  gap: 0.8rem; align-items: start; font-size: var(--text-sm); color: var(--color-text-muted);
}
.tick-list li::before {
  content: ""; display: block; width: 1.25rem; height: 1.25rem;
  border-radius: 50%; margin-top: 0.2rem;
  background: color-mix(in oklab, var(--color-success) 18%, transparent);
  box-shadow: inset 0 0 0 3.5px var(--color-success);
}
.metrics-stack { display: grid; gap: var(--space-3); }
.metric-row {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--space-4); padding: var(--space-4) var(--space-5);
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}
.metric-row__label { font-size: var(--text-sm); color: var(--color-text-muted); }
.metric-row__value { font-size: var(--text-base); font-weight: 600; white-space: nowrap; }

/* ===================== PRICING ===================== */
.pricing-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: var(--space-5); margin-top: var(--space-8); align-items: start;
}
.pricing-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: clamp(var(--space-6), 3vw, var(--space-8));
  display: flex; flex-direction: column; gap: var(--space-5);
  position: relative;
}
.pricing-card--featured {
  border-color: color-mix(in oklab, var(--color-primary) 35%, var(--color-border));
  background: linear-gradient(180deg,
    color-mix(in oklab, var(--color-primary-highlight) 60%, var(--color-surface) 40%),
    var(--color-surface)
  );
  transform: translateY(-8px);
  box-shadow: var(--shadow-md);
}
.plan-tag {
  position: absolute; top: 1.1rem; right: 1.1rem;
  padding: 0.3rem 0.75rem; border-radius: var(--radius-full);
  background: var(--color-primary-highlight); color: var(--color-primary);
  font-size: var(--text-xs); font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em;
}
.plan-name { font-weight: 600; font-size: var(--text-base); }
.plan-price {
  display: flex; align-items: flex-end; gap: 0.4rem;
}
.plan-price__amount {
  font-family: var(--font-display); font-size: clamp(2.5rem, 2rem + 2vw, 3.8rem);
  letter-spacing: -0.04em; line-height: 1;
}
.plan-price__period { font-size: var(--text-sm); color: var(--color-text-muted); padding-bottom: 0.4rem; }
.plan-description { color: var(--color-text-muted); font-size: var(--text-sm); }
.plan-cta { margin-top: auto; }
.plan-cta .btn-secondary { width: 100%; }
.plan-cta .btn-primary { width: 100%; }

.pricing-note {
  margin-top: var(--space-6);
  padding: var(--space-5) var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  font-size: var(--text-sm); color: var(--color-text-muted);
}
.pricing-note strong { color: var(--color-text); }

/* ===================== ADVICE ===================== */
.advice-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: var(--space-4); margin-top: var(--space-6);
}
.advice-card {
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-surface);
}
.advice-card--highlighted {
  background: var(--color-primary-highlight);
  border-color: color-mix(in oklab, var(--color-primary) 25%, transparent);
}
.advice-card h3 { font-size: var(--text-base); font-weight: 600; margin-bottom: 0.5rem; }
.advice-card p { font-size: var(--text-sm); color: var(--color-text-muted); }

/* ===================== FAQ ===================== */
.faq-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: var(--space-4); margin-top: var(--space-8);
}
.faq-item {
  padding: var(--space-6);
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
}
.faq-item h3 { font-size: var(--text-base); font-weight: 600; margin-bottom: 0.5rem; }
.faq-item p { font-size: var(--text-sm); color: var(--color-text-muted); }

/* ===================== CTA SECTION ===================== */
.cta-section {
  padding: clamp(3rem, 6vw, 6rem) 0 clamp(2.5rem, 5vw, 5rem);
}
.cta-panel {
  display: grid; grid-template-columns: 1.2fr 0.8fr;
  gap: clamp(var(--space-6), 4vw, var(--space-10));
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: calc(var(--radius-xl) + 0.25rem);
  padding: clamp(var(--space-6), 4vw, var(--space-10));
  box-shadow: var(--shadow-md); align-items: center;
}
.cta-panel h2 {
  font-family: var(--font-display); font-size: var(--text-xl);
  letter-spacing: -0.03em; margin-bottom: var(--space-3);
}
.cta-panel p { color: var(--color-text-muted); font-size: var(--text-sm); max-width: 52ch; }
.cta-actions { display: flex; flex-direction: column; gap: var(--space-3); }
.cta-actions .btn-primary, .cta-actions .btn-secondary { width: 100%; justify-content: center; }
.cta-note { font-size: var(--text-xs); color: var(--color-text-faint); text-align: center; margin-top: var(--space-2); }

/* ===================== FOOTER ===================== */
.site-footer {
  border-top: 1px solid var(--color-divider);
  padding: var(--space-8) 0;
  background: var(--color-bg);
}
.footer-inner {
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: var(--space-4);
}
.footer-copy { font-size: var(--text-xs); color: var(--color-text-faint); }

/* ===================== RESPONSIVE ===================== */
@media (max-width: 900px) {
  .hero__grid, .value-grid, .cta-panel { grid-template-columns: 1fr; }
  .pricing-grid, .faq-grid, .advice-grid { grid-template-columns: 1fr; }
  .problem-grid { grid-template-columns: 1fr; }
  .pricing-card--featured { transform: none; }
}
@media (max-width: 640px) {
  .hero__stats { grid-template-columns: 1fr; }
  .brand__name { display: none; }
  .header-nav .btn-ghost { display: none; }
  .hero__actions { flex-direction: column; }
  .hero__actions .btn-primary, .hero__actions .btn-secondary { width: 100%; justify-content: center; }
}