/* Dental Yishun - Landing Page Stylesheet
   Design tokens, base rules, animations & components
   Merged & Deduplicated from Stitch Designs
*/

:root {
  /* Brand & Theme Colors */
  --color-primary: #006b5f;
  --color-primary-container: #2dd4bf;
  --color-primary-fixed: #62fae3;
  --color-primary-fixed-dim: #3cddc7;
  --color-on-primary: #ffffff;
  --color-on-primary-container: #00574d;
  --color-on-primary-fixed: #00201c;
  --color-on-primary-fixed-variant: #005047;
  --color-inverse-primary: #3cddc7;

  --color-secondary: #006591;
  --color-secondary-container: #39b8fd;
  --color-secondary-fixed: #c9e6ff;
  --color-secondary-fixed-dim: #89ceff;
  --color-on-secondary: #ffffff;
  --color-on-secondary-container: #004666;
  --color-on-secondary-fixed: #001e2f;
  --color-on-secondary-fixed-variant: #004c6e;

  --color-tertiary: #8d4f00;
  --color-tertiary-container: #ffac5a;
  --color-tertiary-fixed: #ffdcc0;
  --color-tertiary-fixed-dim: #ffb875;
  --color-on-tertiary: #ffffff;
  --color-on-tertiary-container: #744000;
  --color-on-tertiary-fixed: #2d1600;
  --color-on-tertiary-fixed-variant: #6b3b00;

  --color-background: #f8f9ff;
  --color-on-background: #0d1c2f;

  --color-surface: #f8f9ff;
  --color-surface-dim: #ccdbf4;
  --color-surface-bright: #f8f9ff;
  --color-surface-variant: #d5e3fd;
  --color-on-surface: #0d1c2f;
  --color-on-surface-variant: #3c4a46;
  --color-inverse-surface: #233144;
  --color-inverse-on-surface: #ebf1ff;

  --color-surface-container-lowest: #ffffff;
  --color-surface-container-low: #eff4ff;
  --color-surface-container: #e6eeff;
  --color-surface-container-high: #dde9ff;
  --color-surface-container-highest: #d5e3fd;

  --color-outline: #6b7a76;
  --color-outline-variant: #bacac5;

  --color-error: #ba1a1a;
  --color-error-container: #ffdad6;
  --color-on-error: #ffffff;
  --color-on-error-container: #93000a;
  --color-surface-tint: #006b5f;

  --color-cta-orange: #fb923c;
  --color-cta-orange-hover: #ea580c;

  /* Spacing Scale */
  --spacing-unit: 8px;
  --spacing-stack-sm: 8px;
  --spacing-stack-md: 16px;
  --spacing-stack-lg: 32px;
  --spacing-margin-mobile: 16px;
  --spacing-margin-desktop: 40px;
  --spacing-gutter: 24px;
  --spacing-container-max: 1200px;

  /* Border Radii */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-2xl: 1rem;
  --radius-3xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-hero: 0 8px 32px rgba(0, 101, 145, 0.12);
  --shadow-card: 0 4px 20px rgba(13, 28, 47, 0.06);

  /* Typography */
  --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

/* Base Styles */
html {
  font-family: var(--font-family-base);
  background-color: var(--color-background);
  color: var(--color-on-background);
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--color-background);
  color: var(--color-on-background);
  overflow-x: hidden;
}

/* Material Symbols alignment helper */
.material-symbols-outlined {
  font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
  vertical-align: middle;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.material-symbols-filled {
  font-variation-settings: 'FILL' 1, 'wght' 400, 'GRAD' 0, 'opsz' 24;
}

/* Smooth Interactive Elements */
a, button {
  transition: all 0.2s ease-in-out;
}

/* FAQ Accordion Styling */
.faq-item {
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.faq-item.active {
  border-color: rgba(0, 107, 95, 0.3);
  background-color: var(--color-surface);
}

.faq-trigger {
  cursor: pointer;
  user-select: none;
}

.faq-icon {
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
  color: var(--color-primary);
}

.faq-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.3s ease, padding 0.3s ease;
  opacity: 0;
}

.faq-item.active .faq-panel {
  max-height: 300px;
  opacity: 1;
}

/* Mobile Navigation Drawer */
#mobile-menu {
  transition: opacity 0.25s ease, visibility 0.25s ease, transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

#mobile-menu.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(-8px);
}

#mobile-menu:not(.hidden) {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0);
}

/* Sticky Mobile Bottom CTA Bar */
.sticky-mobile-cta {
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.08);
  padding-bottom: calc(0.75rem + env(safe-area-inset-bottom, 0px));
}

/* Card Hover Enhancements */
.hover-lift {
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.hover-lift:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

/* Touch and Focus Accessibility */
button, a, input, select, textarea {
  touch-action: manipulation;
}

button:focus-visible, a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Responsive Image Guard */
img {
  max-width: 100%;
}