/* ==========================================================================
   AUREL — DENTAL EXPERIENCE DESIGN SYSTEM
   Theme: Clinical Precision × Icy Blue Glass × Human Beauty
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;1,400&family=Space+Grotesk:wght@400;500;600;700&display=swap');

:root {
  /* 01. Color Palette */
  --pure-white: #FFFFFF;
  --frost-white: #F7FBFF;
  --ice-blue: #EAF5FF;
  --glacier-blue: #D5EAFE;
  --crystal-blue: #A8D3F5;
  --electric-ice: #70B8F0;
  --deep-clinical-navy: #19334D;
  --soft-border: #E1ECF5;

  /* Extended Nuances */
  --navy-muted: #3B5875;
  --navy-light: #5A7B9B;
  --ice-glow: rgba(112, 184, 240, 0.25);
  --ice-glow-subtle: rgba(168, 211, 245, 0.15);
  --glass-bg: rgba(255, 255, 255, 0.72);
  --glass-bg-hover: rgba(255, 255, 255, 0.90);
  --glass-card: rgba(247, 251, 255, 0.65);
  --glass-border: rgba(225, 236, 245, 0.85);
  --glass-border-highlight: rgba(255, 255, 255, 0.95);
  --surface-alt: #F1F7FD;
  --success: #2E8B57;
  --success-bg: #E8F5E9;
  --warning: #E68A00;
  --danger: #D32F2F;
  --danger-bg: #FFEBEE;

  /* 02. Typography Tokens */
  --font-primary: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-editorial: 'Space Grotesk', 'Plus Jakarta Sans', sans-serif;
  
  --text-xs: 0.75rem;     /* 12px */
  --text-sm: 0.875rem;    /* 14px */
  --text-base: 1rem;      /* 16px */
  --text-md: 1.125rem;    /* 18px */
  --text-lg: 1.25rem;     /* 20px */
  --text-xl: 1.5rem;      /* 24px */
  --text-2xl: 1.875rem;   /* 30px */
  --text-3xl: 2.25rem;    /* 36px */
  --text-4xl: 3rem;       /* 48px */
  --text-5xl: 3.75rem;    /* 60px */
  --text-6xl: 4.5rem;     /* 72px */
  --text-hero: clamp(2.5rem, 5.5vw, 5.25rem);

  /* 03. Spacing System */
  --space-2xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4.5rem;
  --space-4xl: 6rem;
  --space-5xl: 8rem;

  /* 04. Radii & Surface Depth */
  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-pill: 9999px;

  /* Shadows (Refined, crisp, clean) */
  --shadow-subtle: 0 2px 8px rgba(25, 51, 77, 0.03);
  --shadow-sm: 0 4px 16px rgba(25, 51, 77, 0.05);
  --shadow-md: 0 8px 30px rgba(25, 51, 77, 0.07);
  --shadow-lg: 0 16px 48px rgba(25, 51, 77, 0.09);
  --shadow-glass: 0 8px 32px 0 rgba(25, 51, 77, 0.06), inset 0 0 0 1px rgba(255, 255, 255, 0.8);
  --shadow-glass-hover: 0 16px 40px rgba(112, 184, 240, 0.16), inset 0 0 0 1px rgba(255, 255, 255, 1);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.2, 0, 0, 1);
  --transition-base: 250ms cubic-bezier(0.2, 0, 0, 1);
  --transition-smooth: 400ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 700ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Layout */
  --container-max: 1320px;
  --header-height: 84px;
  --header-height-scrolled: 70px;
}

/* ==========================================================================
   Base & Reset
   ========================================================================== */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-color: var(--frost-white);
  color: var(--deep-clinical-navy);
}

body {
  font-family: var(--font-primary);
  font-weight: 400;
  line-height: 1.6;
  color: var(--deep-clinical-navy);
  background-color: var(--frost-white);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  position: relative;
}

/* Background Ambient Lighting Mesh */
body::before {
  content: '';
  position: fixed;
  top: -20vw;
  right: -10vw;
  width: 65vw;
  height: 65vw;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(213, 234, 254, 0.45) 0%, rgba(234, 245, 255, 0.15) 50%, rgba(255,255,255,0) 70%);
  pointer-events: none;
  z-index: 0;
}

body::after {
  content: '';
  position: fixed;
  bottom: -15vw;
  left: -10vw;
  width: 50vw;
  height: 50vw;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(168, 211, 245, 0.25) 0%, rgba(247, 251, 255, 0) 70%);
  pointer-events: none;
  z-index: 0;
}

/* Typography Base Elements */
h1, h2, h3, h4, h5, h6 {
  color: var(--deep-clinical-navy);
  font-family: var(--font-primary);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
}

h1 { font-size: var(--text-hero); }
h2 { font-size: var(--text-3xl); letter-spacing: -0.02em; }
h3 { font-size: var(--text-2xl); letter-spacing: -0.015em; }
h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); font-weight: 600; }
h6 { font-size: var(--text-base); font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; }

p {
  color: var(--navy-muted);
  font-size: var(--text-base);
  line-height: 1.65;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  outline: none;
}

/* ==========================================================================
   Layout Containers & Grid Utilities
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: clamp(1.25rem, 3.5vw, 2.5rem);
  padding-right: clamp(1.25rem, 3.5vw, 2.5rem);
  position: relative;
  z-index: 1;
}

.container-narrow {
  max-width: 980px;
}

.section {
  padding-top: clamp(3.5rem, 7vw, 6.5rem);
  padding-bottom: clamp(3.5rem, 7vw, 6.5rem);
  position: relative;
}

.section-hero {
  padding-top: calc(var(--header-height) + clamp(1.5rem, 3vw, 3rem));
  padding-bottom: clamp(3rem, 5vw, 5rem);
  min-height: 92vh;
  display: flex;
  align-items: center;
}

/* Asymmetric & Modern Grids */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(1.5rem, 3vw, 2.5rem);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1.25rem, 2.5vw, 2rem);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(1rem, 2vw, 1.75rem);
}

.grid-asym-60-40 {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: clamp(2rem, 4vw, 3.5rem);
  align-items: center;
}

.grid-asym-40-60 {
  display: grid;
  grid-template-columns: 1fr 1.35fr;
  gap: clamp(2rem, 4vw, 3.5rem);
  align-items: center;
}

/* ==========================================================================
   Glassmorphic & Material Utility Classes
   ========================================================================== */

.glass-panel {
  background: var(--glass-bg);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-glass);
  border-radius: var(--radius-lg);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.glass-panel:hover {
  border-color: var(--glass-border-highlight);
  box-shadow: var(--shadow-glass-hover);
}

.glass-card {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--soft-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.glass-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--crystal-blue);
}

.glass-pill {
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--soft-border);
  border-radius: var(--radius-pill);
  padding: 0.4rem 1rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--navy-muted);
}

.glass-pill .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--electric-ice);
  box-shadow: 0 0 8px var(--electric-ice);
}

/* Editorial Category Label */
.editorial-tag {
  font-family: var(--font-editorial);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--electric-ice);
  margin-bottom: 0.75rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.editorial-tag::before {
  content: '';
  display: inline-block;
  width: 14px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
}

/* Section Header Component */
.section-header {
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}

.section-header.text-center {
  text-align: center;
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
}

.section-header .section-title {
  font-size: clamp(1.85rem, 3.5vw, 2.75rem);
  color: var(--deep-clinical-navy);
  margin-bottom: 1rem;
  font-weight: 700;
  line-height: 1.2;
}

.section-header .section-subtitle {
  font-size: clamp(1rem, 1.2vw, 1.15rem);
  color: var(--navy-muted);
  max-width: 640px;
  margin: 0 auto;
}

/* ==========================================================================
   Buttons & Interactive Elements
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  padding: 0.85rem 1.75rem;
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.01em;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  border: none;
  white-space: nowrap;
}

/* Primary Hero / Appointment CTA */
.btn-primary {
  background: var(--deep-clinical-navy);
  color: var(--pure-white);
  box-shadow: 0 4px 18px rgba(25, 51, 77, 0.2);
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.6s ease;
}

.btn-primary:hover {
  background: #13273b;
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(25, 51, 77, 0.28);
}

.btn-primary:hover::before {
  left: 100%;
}

/* Electric Ice Accent Button */
.btn-electric {
  background: linear-gradient(135deg, var(--electric-ice) 0%, #4FA3EA 100%);
  color: var(--pure-white);
  box-shadow: 0 4px 20px rgba(112, 184, 240, 0.35);
}

.btn-electric:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(112, 184, 240, 0.5);
  filter: brightness(1.04);
}

/* Secondary Frosted Glass Button */
.btn-glass {
  background: rgba(255, 255, 255, 0.85);
  color: var(--deep-clinical-navy);
  border: 1px solid var(--soft-border);
  backdrop-filter: blur(10px);
}

.btn-glass:hover {
  background: var(--pure-white);
  border-color: var(--crystal-blue);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
  color: #0d2133;
}

/* Minimal Text Link Button */
.btn-link {
  background: transparent;
  color: var(--deep-clinical-navy);
  padding: 0.5rem 0.25rem;
  border-radius: 0;
  font-weight: 600;
  position: relative;
}

.btn-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 1.5px;
  background: var(--electric-ice);
  transform: scaleX(0.3);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.btn-link:hover::after {
  transform: scaleX(1);
}

.btn-sm {
  padding: 0.55rem 1.15rem;
  font-size: var(--text-xs);
}

.btn-lg {
  padding: 1.05rem 2.25rem;
  font-size: var(--text-base);
}

/* Icon Buttons */
.btn-icon {
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid var(--soft-border);
  color: var(--deep-clinical-navy);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-icon:hover {
  background: var(--pure-white);
  border-color: var(--crystal-blue);
  transform: scale(1.05);
}

/* Accessibility Focus States */
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--electric-ice);
  outline-offset: 3px;
}

/* Motion Preferences */
@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;
  }
}