/* =============================================
   REGROWMYTEETH.COM — STYLESHEET
   Warm & Hopeful aesthetic
   Palette: Warm cream surfaces, coral-rose accent, soft teal CTA
============================================= */

/* ── Design Tokens ── */
:root,
[data-theme='light'] {
  /* Type Scale */
  --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);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);

  /* Spacing */
  --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;
  --space-32: 8rem;

  /* Warm cream surfaces */
  --color-bg:              #fdf9f5;
  --color-surface:         #faf6f1;
  --color-surface-2:       #f6f1eb;
  --color-surface-offset:  #ede8e1;
  --color-divider:         #e0d9cf;
  --color-border:          #d4cdc3;

  /* Text — warm charcoal */
  --color-text:        #2c2520;
  --color-text-muted:  #7a6f66;
  --color-text-faint:  #b5ad a5;
  --color-text-faint:  #b8b0a7;
  --color-text-inverse:#fdf9f5;

  /* Primary — warm teal */
  --color-primary:           #0a7c7a;
  --color-primary-hover:     #085f5d;
  --color-primary-active:    #064240;
  --color-primary-highlight: #cde5e4;

  /* Accent — warm coral for highlights */
  --color-accent:            #c95c3a;
  --color-accent-hover:      #a8471e;
  --color-accent-highlight:  #f5ddd7;

  /* Radius */
  --radius-sm: 0.375rem;  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;   --radius-xl: 1.25rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px oklch(0.2 0.02 50 / 0.07);
  --shadow-md: 0 4px 16px oklch(0.2 0.02 50 / 0.10);
  --shadow-lg: 0 12px 40px oklch(0.2 0.02 50 / 0.14);

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

  /* Content widths */
  --content-narrow:  680px;
  --content-default: 1000px;
  --content-wide:    1200px;

  /* Fonts */
  --font-display: 'Instrument Serif', Georgia, serif;
  --font-body:    'DM Sans', system-ui, sans-serif;
}

[data-theme='dark'] {
  --color-bg:              #181410;
  --color-surface:         #1e1a16;
  --color-surface-2:       #241f1a;
  --color-surface-offset:  #2a2520;
  --color-divider:         #332d27;
  --color-border:          #3e3830;
  --color-text:            #e8e0d8;
  --color-text-muted:      #9a9089;
  --color-text-faint:      #5e574f;
  --color-text-inverse:    #181410;
  --color-primary:         #4fa8a6;
  --color-primary-hover:   #258f8d;
  --color-primary-active:  #146c6a;
  --color-primary-highlight: #233535;
  --color-accent:          #e0805e;
  --color-accent-hover:    #c06242;
  --color-accent-highlight: #3d2820;
  --shadow-sm: 0 1px 3px oklch(0 0 0 / 0.25);
  --shadow-md: 0 4px 16px oklch(0 0 0 / 0.35);
  --shadow-lg: 0 12px 40px oklch(0 0 0 / 0.45);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #181410; --color-surface: #1e1a16; --color-surface-2: #241f1a;
    --color-surface-offset: #2a2520; --color-divider: #332d27; --color-border: #3e3830;
    --color-text: #e8e0d8; --color-text-muted: #9a9089; --color-text-faint: #5e574f;
    --color-text-inverse: #181410; --color-primary: #4fa8a6; --color-primary-hover: #258f8d;
    --color-primary-active: #146c6a; --color-primary-highlight: #233535;
    --color-accent: #e0805e; --color-accent-hover: #c06242;
    --shadow-sm: 0 1px 3px oklch(0 0 0 / 0.25); --shadow-md: 0 4px 16px oklch(0 0 0 / 0.35);
  }
}

/* ── Base Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  -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;
  line-height: 1.6;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color 0.3s ease, color 0.3s ease;
}
img, picture, video { display: block; max-width: 100%; height: auto; }
h1, h2, h3, h4, h5 { text-wrap: balance; line-height: 1.15; }
p, li { text-wrap: pretty; }
ul[role='list'], ol[role='list'] { list-style: none; }
input, button, select { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: none; }
a, button, [role='button'], input { transition: color var(--transition), background var(--transition), border-color var(--transition), box-shadow var(--transition); }
::selection { background: oklch(from var(--color-primary) l c h / 0.2); color: var(--color-text); }
:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px; border-radius: var(--radius-sm); }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !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-width: 0; }

/* ── Layout Utilities ── */
.container {
  max-width: var(--content-default);
  margin-inline: auto;
  padding-inline: clamp(var(--space-5), 5vw, var(--space-12));
}
.container-narrow {
  max-width: var(--content-narrow);
  margin-inline: auto;
  padding-inline: clamp(var(--space-5), 5vw, var(--space-12));
}
.section {
  padding-block: clamp(var(--space-12), 8vw, var(--space-32));
}

/* ── Header ── */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: oklch(from var(--color-bg) l c h / 0.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-divider);
  transition: box-shadow 0.3s ease, transform 0.3s cubic-bezier(0.16,1,0.3,1);
}
.header--scrolled { box-shadow: var(--shadow-sm); }
.header-inner {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  max-width: var(--content-wide);
  margin-inline: auto;
  padding: var(--space-4) clamp(var(--space-5), 5vw, var(--space-12));
}
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-text);
  flex-shrink: 0;
}
.logo-text {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 400;
  letter-spacing: -0.01em;
}
.logo-accent { color: var(--color-primary); }
.nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  margin-left: auto;
}
.nav a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  letter-spacing: 0.01em;
}
.nav a:hover { color: var(--color-text); }
.nav-cta {
  background: var(--color-primary) !important;
  color: var(--color-text-inverse) !important;
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-full);
  font-weight: 600 !important;
}
.nav-cta:hover { background: var(--color-primary-hover) !important; }
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  flex-shrink: 0;
}
.theme-toggle:hover { background: var(--color-surface-2); color: var(--color-text); }
.mobile-menu-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  color: var(--color-text);
}
.mobile-nav {
  padding: var(--space-4) clamp(var(--space-5), 5vw, var(--space-12));
  border-top: 1px solid var(--color-divider);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  background: var(--color-bg);
}
.mobile-nav a {
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  padding-block: var(--space-2);
}

@media (max-width: 700px) {
  .nav { display: none; }
  .mobile-menu-btn { display: flex; }
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  text-decoration: none;
  cursor: pointer;
  border: 2px solid transparent;
  white-space: nowrap;
}
.btn-primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-color: var(--color-primary);
}
.btn-primary:hover { background: var(--color-primary-hover); border-color: var(--color-primary-hover); }
.btn-ghost {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn-ghost:hover { background: var(--color-surface-2); border-color: var(--color-text-muted); }
.text-link {
  color: var(--color-primary);
  font-weight: 500;
  text-decoration: none;
  font-size: var(--text-sm);
}
.text-link:hover { text-decoration: underline; }

/* ── Hero ── */
.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: center;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(var(--space-5), 5vw, var(--space-12));
  padding-block: clamp(var(--space-16), 10vw, var(--space-32));
  min-height: 80vh;
}
.hero-content { max-width: 560px; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: var(--color-accent-highlight);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-6);
}
.hero-heading {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 400;
  line-height: 1.1;
  color: var(--color-text);
  margin-bottom: var(--space-5);
  letter-spacing: -0.02em;
}
.hero-subhead {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: var(--space-8);
  max-width: 50ch;
}
.hero-actions {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-bottom: var(--space-12);
}
.hero-stat-row {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  flex-wrap: wrap;
}
.hero-stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.stat-number {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
  color: var(--color-primary);
  line-height: 1;
}
.stat-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 500;
  letter-spacing: 0.02em;
}
.hero-stat-divider {
  width: 1px;
  height: 40px;
  background: var(--color-divider);
}
.hero-image-wrap {
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  aspect-ratio: 4/3;
}
.hero-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 20%;
}

@media (max-width: 860px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    gap: var(--space-10);
  }
  .hero-content { max-width: 100%; }
  .hero-image-wrap { max-height: 320px; }
}

/* ── Section Labels ── */
.section-label {
  display: block;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}
.section-intro {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 55ch;
  margin-top: var(--space-3);
  margin-bottom: var(--space-10);
}

/* ── Science Section ── */
.science-section { background: var(--color-surface); }
.science-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(var(--space-10), 6vw, var(--space-20));
  align-items: center;
}
.science-text h2 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 400;
  margin-bottom: var(--space-6);
  letter-spacing: -0.02em;
}
.science-text p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  max-width: 55ch;
  line-height: 1.7;
}
.science-text p strong { color: var(--color-text); font-weight: 600; }
.science-text .text-link { margin-top: var(--space-2); display: inline-block; }
.science-image-wrap {
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: white;
  box-shadow: var(--shadow-md);
  position: relative;
}
.science-image { width: 100%; height: auto; display: block; }
.science-image-caption {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface-offset);
  line-height: 1.5;
}
@media (max-width: 760px) {
  .science-grid { grid-template-columns: 1fr; }
  .science-image-wrap { order: -1; }
}

/* ── Timeline ── */
.timeline-section h2 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 400;
  margin-bottom: var(--space-2);
  letter-spacing: -0.02em;
}
.timeline {
  margin-top: var(--space-10);
  position: relative;
  padding-left: var(--space-8);
}
.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--color-divider);
  border-radius: var(--radius-full);
}
.timeline-item {
  position: relative;
  padding-bottom: var(--space-8);
  display: flex;
  gap: var(--space-6);
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-marker {
  position: absolute;
  left: calc(-1 * var(--space-8) + 0px);
  top: 5px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  flex-shrink: 0;
  z-index: 1;
}
.timeline-complete .timeline-marker { background: var(--color-primary); border: 3px solid var(--color-bg); box-shadow: 0 0 0 2px var(--color-primary); }
.timeline-marker-active { background: var(--color-accent) !important; border: 3px solid var(--color-bg) !important; box-shadow: 0 0 0 2px var(--color-accent) !important; }
.timeline-marker-future { background: var(--color-surface-offset); border: 2px solid var(--color-border); }
.timeline-body { flex: 1; }
.timeline-date {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
  display: block;
}
.timeline-body h3 {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}
.timeline-active-label { color: var(--color-accent); }
.timeline-body p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
  max-width: 55ch;
}
.timeline-future .timeline-body h3,
.timeline-future .timeline-body p { opacity: 0.65; }
.timeline-status-badge {
  display: inline-block;
  margin-top: var(--space-3);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: var(--color-accent-highlight);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
}

/* ── News Section ── */
.news-section { background: var(--color-surface); }
.news-section h2 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 400;
  margin-bottom: var(--space-2);
  letter-spacing: -0.02em;
}
.news-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  grid-template-rows: auto auto;
  gap: var(--space-5);
}
.news-card {
  background: var(--color-bg);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: box-shadow var(--transition), transform var(--transition);
}
.news-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.news-card-featured {
  grid-row: 1 / 3;
  background: linear-gradient(135deg, var(--color-primary-highlight), var(--color-bg));
}
.news-card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}
.news-tag {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: var(--color-primary-highlight);
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
}
time { font-size: var(--text-xs); color: var(--color-text-muted); font-weight: 500; }
.news-card h3 {
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-3);
  line-height: 1.35;
  color: var(--color-text);
}
.news-card-featured h3 { font-family: var(--font-display); font-size: var(--text-lg); font-weight: 400; }
.news-card p { font-size: var(--text-sm); color: var(--color-text-muted); line-height: 1.6; margin-bottom: var(--space-4); }
.news-link {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: 0.02em;
}
.news-link:hover { text-decoration: underline; }

@media (max-width: 860px) {
  .news-grid { grid-template-columns: 1fr; }
  .news-card-featured { grid-row: auto; }
}

/* ── Subscribe Section ── */
.subscribe-section { background: var(--color-surface-2); }
.subscribe-box {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-xl);
  padding: clamp(var(--space-8), 5vw, var(--space-16));
  text-align: center;
  box-shadow: var(--shadow-md);
}
.subscribe-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 72px;
  background: var(--color-primary-highlight);
  border-radius: 50%;
  margin-bottom: var(--space-6);
}
.subscribe-box h2 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 400;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-4);
}
.subscribe-box > p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 50ch;
  margin-inline: auto;
  margin-bottom: var(--space-8);
  line-height: 1.65;
}
.subscribe-form { max-width: 480px; margin-inline: auto; }
.form-row {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}
.form-input {
  flex: 1;
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-sm);
  color: var(--color-text);
  outline: none;
}
.form-input:focus { border-color: var(--color-primary); box-shadow: 0 0 0 3px var(--color-primary-highlight); }
.form-input::placeholder { color: var(--color-text-faint); }
.form-btn { flex-shrink: 0; font-size: var(--text-sm) !important; }
.form-note {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-align: center;
}
.form-success {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-primary);
  font-weight: 600;
  background: var(--color-primary-highlight);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-lg);
  margin-top: var(--space-4);
}

@media (max-width: 520px) {
  .form-row { flex-direction: column; }
  .form-btn { width: 100%; justify-content: center; }
}

/* ── FAQ Section ── */
.faq-section h2 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 400;
  margin-bottom: var(--space-8);
  letter-spacing: -0.02em;
}
.faq-list { display: flex; flex-direction: column; gap: 0; }
.faq-item {
  border-top: 1px solid var(--color-divider);
  padding-block: var(--space-6);
}
.faq-item:last-child { border-bottom: 1px solid var(--color-divider); }
.faq-question {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-3);
  line-height: 1.4;
}
.faq-answer {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
  max-width: 60ch;
}

/* ── Footer ── */
.footer {
  background: var(--color-surface-offset);
  border-top: 1px solid var(--color-divider);
  padding-block: var(--space-12) var(--space-8);
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-8);
  flex-wrap: wrap;
  margin-bottom: var(--space-10);
}
.footer-brand { max-width: 340px; }
.footer-tagline {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-top: var(--space-3);
  line-height: 1.6;
}
.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.footer-links a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 500;
}
.footer-links a:hover { color: var(--color-text); }
.footer-bottom {
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-divider);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.footer-disclaimer {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  max-width: 70ch;
  line-height: 1.6;
}
.footer-copy {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}