/* ============================================================================
   DENTALONE PUBLIC WEBSITE — BASE STYLES
   Reset, typography, layout primitives
   ============================================================================ */

/* — Modern 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;
  font-size: 16px;
}

body {
  font-family: var(--do-font-sans);
  color: var(--do-text);
  background-color: var(--do-bg);
  font-size: var(--do-text-base);
  font-weight: var(--do-weight-regular);
  line-height: var(--do-leading-normal);
  overflow-x: hidden;
  min-height: 100vh;
}

img, svg, video {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  cursor: pointer;
  font-family: inherit;
  border: none;
  background: none;
  color: inherit;
}

ul, ol {
  list-style: none;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

::selection {
  background-color: var(--do-teal-200);
  color: var(--do-slate-900);
}

/* — Typography ------------------------------------------------------------ */
.do-display {
  font-family: var(--do-font-display);
  font-size: clamp(2.75rem, 6vw, var(--do-text-7xl));
  font-weight: var(--do-weight-regular);
  line-height: var(--do-leading-tight);
  letter-spacing: var(--do-tracking-tight);
  color: var(--do-text);
}

.do-h1 {
  font-family: var(--do-font-display);
  font-size: clamp(2.25rem, 5vw, var(--do-text-6xl));
  font-weight: var(--do-weight-regular);
  line-height: var(--do-leading-tight);
  letter-spacing: var(--do-tracking-tight);
  color: var(--do-text);
}

.do-h2 {
  font-family: var(--do-font-display);
  font-size: clamp(1.75rem, 3.5vw, var(--do-text-4xl));
  font-weight: var(--do-weight-regular);
  line-height: var(--do-leading-snug);
  letter-spacing: var(--do-tracking-tight);
  color: var(--do-text);
}

.do-h3 {
  font-family: var(--do-font-sans);
  font-size: clamp(1.25rem, 2vw, var(--do-text-2xl));
  font-weight: var(--do-weight-semibold);
  line-height: var(--do-leading-snug);
  letter-spacing: var(--do-tracking-tight);
  color: var(--do-text);
}

.do-h4 {
  font-family: var(--do-font-sans);
  font-size: var(--do-text-lg);
  font-weight: var(--do-weight-semibold);
  line-height: var(--do-leading-snug);
  color: var(--do-text);
}

.do-body {
  font-size: var(--do-text-base);
  line-height: var(--do-leading-relaxed);
  color: var(--do-text-secondary);
}

.do-body-lg {
  font-size: var(--do-text-lg);
  line-height: var(--do-leading-relaxed);
  color: var(--do-text-secondary);
}

.do-caption {
  font-size: var(--do-text-sm);
  line-height: var(--do-leading-normal);
  color: var(--do-text-muted);
}

.do-overline {
  font-family: var(--do-font-sans);
  font-size: var(--do-text-xs);
  font-weight: var(--do-weight-semibold);
  letter-spacing: var(--do-tracking-wider);
  text-transform: uppercase;
  color: var(--do-primary);
}

/* — Layout ---------------------------------------------------------------- */
.do-container {
  width: 100%;
  max-width: var(--do-container-max);
  margin-inline: auto;
  padding-inline: var(--do-gutter);
}

.do-container--lg {
  max-width: var(--do-container-lg);
}

.do-container--sm {
  max-width: var(--do-container-sm);
}

.do-section {
  padding-block: var(--do-section-space);
}

.do-section--tinted {
  background-color: var(--do-bg-subtle);
}

.do-section--compact {
  padding-top: var(--do-space-8);
  padding-bottom: var(--do-space-8);
}

.do-section--teal {
  background-color: var(--do-bg-teal);
}

/* — Section Header -------------------------------------------------------- */
.do-section-header {
  text-align: center;
  max-width: 680px;
  margin-inline: auto;
  margin-bottom: var(--do-space-8);
}

.do-section-header .do-overline {
  margin-bottom: var(--do-space-4);
  display: block;
}

.do-section-header .do-h2 {
  margin-bottom: var(--do-space-4);
}

.do-section-header .do-body-lg {
  max-width: 560px;
  margin-inline: auto;
}

/* — Grid Utilities -------------------------------------------------------- */
.do-grid {
  display: grid;
  gap: var(--do-space-6);
}

.do-grid--2 {
  grid-template-columns: repeat(2, 1fr);
}

.do-grid--3 {
  grid-template-columns: repeat(3, 1fr);
}

.do-grid--4 {
  grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 1024px) {
  .do-grid--4 { grid-template-columns: repeat(2, 1fr); }
  .do-grid--3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .do-grid--4,
  .do-grid--3,
  .do-grid--2 { grid-template-columns: 1fr; }
}

@media (min-width: 1025px) {
  .do-grid--3.do-grid--center-last > :last-child:nth-child(3n + 1) {
    grid-column: 2;
  }
}

@media (max-width: 1024px) and (min-width: 641px) {
  .do-grid--3.do-grid--center-last > :last-child:nth-child(2n + 1) {
    grid-column: 1 / -1;
    justify-self: center;
    width: calc(50% - (var(--do-space-6) / 2));
  }
}

/* — Scroll-triggered Animations ------------------------------------------- */
.do-reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--do-dur-slow) var(--do-ease-out),
              transform var(--do-dur-slow) var(--do-ease-out);
}

.do-reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.do-reveal-delay-1 { transition-delay: 80ms; }
.do-reveal-delay-2 { transition-delay: 160ms; }
.do-reveal-delay-3 { transition-delay: 240ms; }
.do-reveal-delay-4 { transition-delay: 320ms; }

/* — Misc Utilities -------------------------------------------------------- */
.do-text-center { text-align: center; }
.do-text-left { text-align: left; }
.do-mx-auto { margin-inline: auto; }

.do-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;
}