/* ==========================================================================
   Dr. G. Rajeswari Patra — Core Stylesheet
   Design system, layout primitives, navigation, footer, shared components
   ========================================================================== */

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

/* ------------------------------ Variables ------------------------------- */
:root{
  /* Brand palette */
  --color-primary: #0E7490;
  --color-primary-rgb: 14,116,144;
  --color-secondary: #0891B2;
  --color-accent: #06B6D4;
  --color-accent-rgb: 6,182,212;
  --color-success: #10B981;

  /* Light theme surfaces */
  --color-bg: #F8FAFC;
  --color-surface: #FFFFFF;
  --color-surface-alt: #F1F5F9;
  --color-text: #1E293B;
  --color-text-muted: #55677D;
  --color-text-soft: #7C8CA0;
  --color-border: rgba(15,23,42,0.08);
  --color-border-strong: rgba(15,23,42,0.14);
  --overlay-scrim: rgba(15,23,42,0.55);

  --shadow-sm: 0 1px 2px rgba(15,23,42,0.06), 0 1px 3px rgba(15,23,42,0.06);
  --shadow-md: 0 8px 24px -8px rgba(15,23,42,0.16);
  --shadow-lg: 0 24px 60px -16px rgba(15,23,42,0.22);
  --shadow-glow: 0 0 0 1px rgba(var(--color-accent-rgb),0.18), 0 20px 50px -20px rgba(var(--color-primary-rgb),0.45);

  /* Typography */
  --font-heading: 'Playfair Display', 'Georgia', serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --fs-xs: clamp(0.75rem, 0.72rem + 0.15vw, 0.8125rem);
  --fs-sm: clamp(0.875rem, 0.84rem + 0.18vw, 0.9375rem);
  --fs-base: clamp(1rem, 0.96rem + 0.2vw, 1.0625rem);
  --fs-md: clamp(1.125rem, 1.06rem + 0.3vw, 1.25rem);
  --fs-lg: clamp(1.375rem, 1.25rem + 0.6vw, 1.75rem);
  --fs-xl: clamp(1.75rem, 1.5rem + 1.2vw, 2.5rem);
  --fs-2xl: clamp(1.9rem, 1.5rem + 2.4vw, 3.5rem);
  --fs-3xl: clamp(2.15rem, 1.5rem + 4vw, 4.75rem);

  --lh-tight: 1.15;
  --lh-snug: 1.35;
  --lh-normal: 1.6;
  --lh-relaxed: 1.8;

  /* Spacing scale */
  --space-3xs: 0.25rem;
  --space-2xs: 0.5rem;
  --space-xs: 0.75rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
  --space-3xl: 9rem;

  --container-max: 1400px;
  --container-narrow: 860px;
  --container-pad: clamp(1.25rem, 4vw, 3rem);

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 28px;
  --radius-pill: 999px;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-soft: cubic-bezier(0.4, 0, 0.2, 1);
  --dur-fast: 0.22s;
  --dur-med: 0.5s;
  --dur-slow: 0.9s;

  --nav-h: 84px;
  color-scheme: light;
}

/* ------------------------------ Reset ----------------------------------- */
*, *::before, *::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *, *::before, *::after{ animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}
body, h1, h2, h3, h4, p, figure, blockquote, dl, dd{ margin: 0; }
ul[class], ol[class]{ list-style: none; margin: 0; padding: 0; }
img, picture, svg{ display: block; max-width: 100%; }
img{ height: auto; }
input, button, textarea, select{ font: inherit; color: inherit; }
button{ background: none; border: none; cursor: pointer; }
a{ color: inherit; text-decoration: none; }
a, button{ -webkit-tap-highlight-color: transparent; }

body{
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color var(--dur-med) var(--ease-soft), color var(--dur-med) var(--ease-soft);
  overflow-x: hidden;
}

::selection{ background: var(--color-accent); color: #fff; }

:focus-visible{
  outline: 2.5px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link{
  position: fixed;
  top: -100px; left: var(--space-sm);
  z-index: 2000;
  background: var(--color-primary);
  color: #fff;
  padding: 0.85rem 1.5rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: top var(--dur-fast) var(--ease-out);
}
.skip-link:focus{ top: var(--space-sm); }

/* ------------------------------ Typography ------------------------------ */
h1, h2, h3, h4{
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: var(--lh-tight);
  color: var(--color-text);
  letter-spacing: -0.01em;
}
h1{ font-size: var(--fs-3xl); }
h2{ font-size: var(--fs-2xl); }
h3{ font-size: var(--fs-lg); }
h4{ font-size: var(--fs-md); font-family: var(--font-body); font-weight: 600; }

p{ color: var(--color-text-muted); }
p + p{ margin-top: 1em; }

.lede{
  font-size: var(--fs-md);
  line-height: var(--lh-relaxed);
  color: var(--color-text-muted);
}

.eyebrow{
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-secondary);
}
.eyebrow::before{
  content: '';
  width: 28px; height: 1.5px;
  background: currentColor;
  display: inline-block;
}

.section-head{
  max-width: 700px;
  margin-bottom: var(--space-lg);
}
.section-head.center{ margin-inline: auto; text-align: center; }
.section-head h2{ margin-top: var(--space-xs); }
.section-head p{ margin-top: var(--space-sm); }

.text-accent{ color: var(--color-primary); }
.font-serif{ font-family: var(--font-heading); }
.italic{ font-style: italic; }

/* ------------------------------ Layout ----------------------------------- */
.container{
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}
.container--narrow{ max-width: var(--container-narrow); }

.section{ padding-block: var(--space-2xl); position: relative; }
.section--tight{ padding-block: var(--space-xl); }
.section--alt{ background: var(--color-surface-alt); }
.section--dark{
  background: var(--color-bg-dark, #0F172A);
  color: var(--color-text-dark, #E2E8F0);
}

.divider{
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-border-strong) 25%, var(--color-border-strong) 75%, transparent);
  border: none;
  margin: 0;
}
.divider--ornament{
  display: flex; align-items: center; justify-content: center;
  gap: var(--space-sm);
  margin-block: var(--space-lg);
  color: var(--color-secondary);
}
.divider--ornament::before, .divider--ornament::after{
  content: '';
  height: 1px; width: 60px;
  background: var(--color-border-strong);
}

.grid{ display: grid; gap: var(--space-lg); }
.grid-2{ grid-template-columns: repeat(2, 1fr); }
.grid-3{ grid-template-columns: repeat(3, 1fr); }
.grid-4{ grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px){
  .grid-3, .grid-4{ grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px){
  .grid-2, .grid-3, .grid-4{ grid-template-columns: 1fr; }
}

/* ------------------------------ Buttons ---------------------------------- */
.btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6em;
  padding: 0.95rem 1.9rem;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: var(--fs-sm);
  letter-spacing: 0.01em;
  white-space: nowrap;
  transition: transform var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out), background-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
  will-change: transform;
}
.btn svg{ width: 1.15em; height: 1.15em; flex-shrink: 0; }
.btn:active{ transform: translateY(1px) scale(0.99); }

.btn--primary{
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: #fff;
  box-shadow: 0 12px 30px -10px rgba(var(--color-primary-rgb), 0.55);
}
.btn--primary:hover{ box-shadow: 0 16px 36px -8px rgba(var(--color-primary-rgb), 0.65); transform: translateY(-2px); }

.btn--whatsapp{
  background: #25D366;
  color: #04321a;
}
.btn--whatsapp:hover{ transform: translateY(-2px); box-shadow: 0 14px 30px -10px rgba(37,211,102,0.55); }

.btn--outline{
  background: transparent;
  color: var(--color-text);
  border: 1.5px solid var(--color-border-strong);
}
.btn--outline:hover{ border-color: var(--color-primary); color: var(--color-primary); transform: translateY(-2px); }

.btn--ghost-light{
  background: rgba(255,255,255,0.12);
  color: #fff;
  border: 1.5px solid rgba(255,255,255,0.35);
  backdrop-filter: blur(6px);
}
.btn--ghost-light:hover{ background: rgba(255,255,255,0.22); transform: translateY(-2px); }

.btn--sm{ padding: 0.7rem 1.35rem; font-size: var(--fs-xs); }
.btn--block{ width: 100%; }

.btn-row{ display: flex; flex-wrap: wrap; gap: var(--space-sm); align-items: center; }

/* ------------------------------ Cards ------------------------------------ */
.card{
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--dur-med) var(--ease-out), box-shadow var(--dur-med) var(--ease-out), border-color var(--dur-med) var(--ease-out);
}
.card:hover{ transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: rgba(var(--color-primary-rgb),0.25); }

.badge{
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  padding: 0.5em 1em;
  border-radius: var(--radius-pill);
  font-size: var(--fs-xs);
  font-weight: 600;
  background: rgba(var(--color-primary-rgb), 0.08);
  color: var(--color-primary);
  border: 1px solid rgba(var(--color-primary-rgb), 0.18);
}
.badge svg{ width: 1.1em; height: 1.1em; }

.quote-block{
  position: relative;
  font-family: var(--font-heading);
  font-style: italic;
  font-size: var(--fs-lg);
  line-height: var(--lh-snug);
  color: var(--color-text);
  padding-left: var(--space-lg);
  border-left: 3px solid var(--color-accent);
}
.quote-block cite{
  display: block;
  margin-top: var(--space-sm);
  font-family: var(--font-body);
  font-style: normal;
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--color-secondary);
}

/* ------------------------------ Navigation -------------------------------- */
.site-header{
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: 1000;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  transition: background-color var(--dur-med) var(--ease-soft), box-shadow var(--dur-med) var(--ease-soft), height var(--dur-med) var(--ease-soft), backdrop-filter var(--dur-med) var(--ease-soft), border-color var(--dur-med) var(--ease-soft);
  border-bottom: 1px solid transparent;
}
.site-header .nav-inner{
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}
.site-header.is-scrolled{
  height: calc(var(--nav-h) - 16px);
  background: rgba(248,250,252,0.72);
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  box-shadow: 0 1px 0 rgba(15,23,42,0.05), 0 12px 30px -20px rgba(15,23,42,0.25);
  border-bottom-color: var(--color-border);
}

.brand{
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--color-text);
}
.brand-mark{
  width: 42px; height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem; font-weight: 700;
  flex-shrink: 0;
  box-shadow: 0 6px 16px -6px rgba(var(--color-primary-rgb),0.6);
}
.brand-text{ display: flex; flex-direction: column; line-height: 1.2; }
.brand-text small{
  font-family: var(--font-body);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-soft);
}

.nav-links{
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}
.nav-links a{
  position: relative;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  padding-block: 0.4rem;
  transition: color var(--dur-fast) var(--ease-out);
}
.nav-links a::after{
  content: '';
  position: absolute;
  left: 0; right: 100%;
  bottom: -2px;
  height: 2px;
  background: var(--color-primary);
  transition: right var(--dur-med) var(--ease-out);
  border-radius: 2px;
}
.nav-links a:hover{ color: var(--color-text); }
.nav-links a:hover::after{ right: 0; }
.nav-links a.active{ color: var(--color-primary); font-weight: 600; }
.nav-links a.active::after{ right: 0; }

.nav-actions{ display: flex; align-items: center; gap: var(--space-sm); }

.theme-toggle{
  width: 42px; height: 42px;
  border-radius: 50%;
  border: 1px solid var(--color-border-strong);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-text);
  transition: background-color var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out);
  flex-shrink: 0;
}
.theme-toggle:hover{ background: var(--color-surface-alt); transform: rotate(12deg); }
.theme-toggle svg{ width: 20px; height: 20px; }
.theme-toggle .icon-moon{ display: none; }
[data-theme="dark"] .theme-toggle .icon-sun{ display: none; }
[data-theme="dark"] .theme-toggle .icon-moon{ display: block; }

.nav-toggle{
  display: none;
  width: 44px; height: 44px;
  border-radius: 50%;
  align-items: center; justify-content: center;
  border: 1px solid var(--color-border-strong);
  flex-shrink: 0;
}
.nav-toggle .bars{ position: relative; width: 18px; height: 12px; }
.nav-toggle .bars span{
  position: absolute; left: 0; width: 100%; height: 1.6px;
  background: var(--color-text);
  transition: transform var(--dur-fast) var(--ease-out), opacity var(--dur-fast) var(--ease-out), top var(--dur-fast) var(--ease-out);
}
.nav-toggle .bars span:nth-child(1){ top: 0; }
.nav-toggle .bars span:nth-child(2){ top: 5px; }
.nav-toggle .bars span:nth-child(3){ top: 10px; }
.nav-toggle[aria-expanded="true"] .bars span:nth-child(1){ top: 5px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .bars span:nth-child(2){ opacity: 0; }
.nav-toggle[aria-expanded="true"] .bars span:nth-child(3){ top: 5px; transform: rotate(-45deg); }

.mobile-panel{
  position: fixed;
  inset: 0;
  z-index: 999;
  background: var(--color-surface);
  padding: calc(var(--nav-h) + var(--space-md)) var(--space-lg) var(--space-lg);
  display: flex; flex-direction: column;
  gap: var(--space-lg);
  transform: translateX(100%);
  transition: transform var(--dur-med) var(--ease-out);
  overflow-y: auto;
}
.mobile-panel.is-open{ transform: translateX(0); }
.mobile-panel .nav-links{ display: flex; flex-direction: column; align-items: flex-start; gap: var(--space-md); }
.mobile-panel .nav-links a{ font-size: var(--fs-lg); font-family: var(--font-heading); }
.mobile-panel .btn-row{ flex-direction: column; align-items: stretch; }

.nav-scrim{
  position: fixed; inset: 0; z-index: 998;
  background: rgba(15,23,42,0.4);
  opacity: 0; pointer-events: none;
  transition: opacity var(--dur-med) var(--ease-out);
}
.nav-scrim.is-visible{ opacity: 1; pointer-events: auto; }

@media (max-width: 960px){
  .nav-links{ display: none; }
  .nav-actions .btn-row{ display: none; }
  .nav-toggle{ display: flex; }
}
@media (max-width: 420px){
  .brand-text small{ display: none; }
  .brand{ font-size: 1rem; gap: 0.5rem; }
  .brand-mark{ width: 36px; height: 36px; font-size: 0.85rem; }
}

/* Reading progress bar */
.reading-progress{
  position: fixed; top: 0; left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  z-index: 1100;
  transition: width 0.1s linear;
}

/* ------------------------------ Hero base --------------------------------- */
.page-hero{
  padding-top: calc(var(--nav-h) + var(--space-xl));
  padding-bottom: var(--space-2xl);
  background: linear-gradient(180deg, var(--color-surface-alt), var(--color-bg));
  position: relative;
  overflow: hidden;
}
.page-hero .container{ position: relative; z-index: 2; }
.page-hero .eyebrow{ margin-bottom: var(--space-sm); }
.page-hero h1{ margin-bottom: var(--space-sm); }
.page-hero .lede{ max-width: 620px; }

/* ------------------------------ Scroll reveal ------------------------------ */
[data-reveal]{
  opacity: 0;
  transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out);
  will-change: transform, opacity;
}
[data-reveal="up"]{ transform: translateY(36px); }
[data-reveal="left"]{ transform: translateX(-40px); }
[data-reveal="right"]{ transform: translateX(40px); }
[data-reveal="scale"]{ transform: scale(0.94); }
[data-reveal].is-visible{ opacity: 1; transform: none; }

/* Above-the-fold content must never depend on JS/IntersectionObserver timing
   (screen readers, no-JS agents, crawlers, or a delayed observer callback
   should never leave hero content invisible). Fallback: if JS never runs,
   force every [data-reveal] element to its resting state immediately. */
.no-js [data-reveal]{ opacity: 1 !important; transform: none !important; }

/* Hero entrance: pure CSS, runs unconditionally on load (no IO dependency) */
@keyframes heroFadeUp{
  from{ opacity: 0; transform: translateY(24px); }
  to{ opacity: 1; transform: none; }
}
.hero-enter{
  opacity: 0;
  animation: heroFadeUp 0.9s var(--ease-out) forwards;
}
@media (prefers-reduced-motion: reduce){
  .hero-enter{ animation: none; opacity: 1; }
}

/* ------------------------------ Footer ------------------------------------- */
.site-footer{
  background: var(--color-bg-dark, #0F172A);
  color: var(--color-text-dark, #E2E8F0);
  padding-top: var(--space-2xl);
  position: relative;
}
.site-footer a{ color: inherit; }
.footer-grid{
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.1fr;
  gap: var(--space-lg);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid rgba(226,232,240,0.1);
}
.footer-brand p{ color: rgba(226,232,240,0.65); margin-top: var(--space-sm); max-width: 320px; }
.footer-brand .brand{ color: #fff; }
.footer-brand .brand-text small{ color: rgba(226,232,240,0.55); }
.footer-col h4{ color: #fff; margin-bottom: var(--space-sm); font-family: var(--font-heading); font-size: var(--fs-md); }
.footer-col ul{ display: flex; flex-direction: column; gap: 0.65rem; }
.footer-col a{ color: rgba(226,232,240,0.72); font-size: var(--fs-sm); transition: color var(--dur-fast); }
.footer-col a:hover{ color: var(--color-accent); }
.footer-col .fine{ color: rgba(226,232,240,0.55); font-size: var(--fs-sm); }
.social-row{ display: flex; gap: 0.6rem; margin-top: var(--space-sm); }
.social-row a{
  width: 38px; height: 38px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: rgba(226,232,240,0.08);
  transition: background var(--dur-fast), transform var(--dur-fast);
}
.social-row a:hover{ background: var(--color-primary); transform: translateY(-3px); }
.social-row svg{ width: 17px; height: 17px; }

.footer-bottom{
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--space-sm);
  padding-block: var(--space-md);
  font-size: var(--fs-xs);
  color: rgba(226,232,240,0.55);
  flex-wrap: wrap;
}
.back-to-top{
  display: inline-flex; align-items: center; gap: 0.5em;
  color: rgba(226,232,240,0.8);
  font-weight: 600; font-size: var(--fs-xs);
}
.back-to-top svg{ width: 16px; height: 16px; transition: transform var(--dur-fast); }
.back-to-top:hover svg{ transform: translateY(-3px); }

@media (max-width: 900px){
  .footer-grid{ grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px){
  .footer-grid{ grid-template-columns: 1fr; }
  .footer-bottom{ flex-direction: column; align-items: flex-start; }
}

/* ------------------------------ Floating actions ---------------------------- */
.fab-stack{
  position: fixed;
  right: clamp(1rem, 3vw, 2rem);
  bottom: clamp(1rem, 3vw, 2rem);
  z-index: 900;
  display: flex; flex-direction: column;
  align-items: flex-end;
  gap: 0.75rem;
}
.fab{
  /* Establishes the containing block for .wa-pulse below. Without this,
     .wa-pulse's position:absolute; inset:0 escapes to the nearest positioned
     ancestor — the fixed .fab-stack, which holds both buttons stacked with
     a gap — so the pulse stretched to that taller rectangle and rendered as
     a vertical oval instead of a circle whenever the button wasn't hovered
     (:hover's transform was accidentally creating the correct containing
     block only in that state). */
  position: relative;
  display: flex; align-items: center; justify-content: center;
  width: 60px; height: 60px;
  border-radius: 50%;
  /* A normal elevation shadow, not --shadow-lg: that token's 60px blur is sized
     for large surfaces (hero portrait, cards) and bleeds past a ~60px circle
     into a visible halo behind these floating buttons. */
  box-shadow: 0 8px 20px -6px rgba(0,0,0,0.35);
  transition: transform var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out);
}
.fab:hover{ transform: translateY(-4px) scale(1.04); }
.fab--whatsapp{ background: #25D366; color: #fff; }
.fab--whatsapp svg{ width: 30px; height: 30px; }
.fab--top{
  width: 46px; height: 46px;
  background: var(--color-surface);
  color: var(--color-primary);
  border: 1px solid var(--color-border);
  opacity: 0; pointer-events: none;
  transform: translateY(10px);
}
.fab--top.is-visible{ opacity: 1; pointer-events: auto; transform: translateY(0); }
.fab--top svg{ width: 20px; height: 20px; }

@media (max-width: 480px){
  .fab{ width: 52px; height: 52px; }
  .fab--whatsapp svg{ width: 26px; height: 26px; }
  .fab--top{ width: 40px; height: 40px; }
}

.wa-pulse{
  position: absolute; inset: 0;
  border-radius: 50%;
  background: #25D366;
  animation: waPulse 2.4s ease-out infinite;
  z-index: -1;
}
@keyframes waPulse{
  0%{ transform: scale(1); opacity: 0.55; }
  100%{ transform: scale(1.9); opacity: 0; }
}

/* ------------------------------ Utility ------------------------------------ */
.text-center{ text-align: center; }
.mt-0{ margin-top: 0; }
.visually-hidden{
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}
.tag-list{ display: flex; flex-wrap: wrap; gap: 0.6rem; }
.stat{ text-align: left; }
.stat .num{
  font-family: var(--font-heading);
  font-size: var(--fs-2xl);
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  display: flex; align-items: baseline; gap: 0.15em;
}
.stat .label{
  margin-top: 0.5rem;
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  font-weight: 500;
}
[data-theme="dark"] .stat .num{ color: var(--color-accent); }

.loader-screen{
  position: fixed; inset: 0; z-index: 3000;
  background: var(--color-bg);
  display: flex; align-items: center; justify-content: center;
  transition: opacity 0.6s var(--ease-out), visibility 0.6s var(--ease-out);
}
.loader-screen.is-hidden{ opacity: 0; visibility: hidden; }
.loader-mark{
  width: 56px; height: 56px;
  border-radius: 50%;
  border: 2px solid var(--color-border-strong);
  border-top-color: var(--color-primary);
  animation: spin 0.9s linear infinite;
}
@keyframes spin{ to{ transform: rotate(360deg); } }