/* ==================================================
   BASE — CSS Variables, Reset, Typography, Utilities
   ================================================== */

:root {
  /* Color Palette */
  --color-primary: #E76F51;
  --color-primary-dark: #d85c3d;
  --color-secondary: #F4A261;
  --color-accent: #2A9D8F;
  --color-dark: #264653;
  --color-bg: #FAFAFA;
  --color-text: #1F2937;
  --color-text-muted: #6B7280;
  --color-card: #FFFFFF;
  --color-border: #E5E7EB;
  --tint-surface: rgba(38, 70, 83, 0.06);
  --skeleton-highlight: #F5F5F5;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  --gradient-dark: linear-gradient(135deg, var(--color-dark), #1a2f38);

  /* Radius */
  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 20px;
  --radius-xl: 24px;
  --radius-full: 999px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(38, 70, 83, 0.06);
  --shadow-md: 0 8px 24px rgba(38, 70, 83, 0.10);
  --shadow-lg: 0 16px 40px rgba(38, 70, 83, 0.14);
  --shadow-glow: 0 8px 30px rgba(231, 111, 81, 0.25);

  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.65);
  --glass-border: rgba(255, 255, 255, 0.4);
  --glass-blur: blur(16px);

  /* Motion */
  --transition-fast: 200ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Layout */
  --container-max: 1280px;
  --header-height: 84px;

  /* Font */
  --font-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* Dark Mode Overrides */
:root[data-theme="dark"] {
  --color-bg: #14181B;
  --color-text: #F3F4F6;
  --color-text-muted: #9CA3AF;
  --color-card: #1E252B;
  --color-border: #2C363D;
  --glass-bg: rgba(30, 37, 43, 0.65);
  --glass-border: rgba(255, 255, 255, 0.08);
  --tint-surface: rgba(255, 255, 255, 0.08);
  --skeleton-highlight: #333D44;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
  max-width: 100%;
}

body {
  font-family: var(--font-base);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  font-size: 16px;
  overflow-x: hidden;
  max-width: 100%;
  transition: background-color var(--transition-base), color var(--transition-base);
}

img {
  max-width: 100%;
  display: block;
}

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

ul, ol {
  list-style: none;
}

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

button {
  cursor: pointer;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.25rem, 4vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 3vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.75rem); }
h4 { font-size: 1.25rem; }

p {
  color: var(--color-text-muted);
}

.eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}

/* ---------- Layout Utilities ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: 24px;
}

.section {
  padding-block: clamp(56px, 8vw, 110px);
}

.section-header {
  max-width: 640px;
  margin-bottom: 48px;
}

.section-header.center {
  margin-inline: auto;
  text-align: center;
}

.flex {
  display: flex;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.grid {
  display: grid;
  gap: 24px;
}

.text-center { text-align: center; }
.text-sm-muted { font-size: 0.85rem; color: var(--color-text-muted); }

/* ---------- Glass Panel ---------- */
.glass {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
}

/* ---------- Scroll Reveal ---------- */
.fade-up {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-up.in-view {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Animations ---------- */
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-14px); }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 0 0 rgba(231, 111, 81, 0.35); }
  50% { box-shadow: 0 0 0 12px rgba(231, 111, 81, 0); }
}

@keyframes shimmer {
  0% { background-position: -400px 0; }
  100% { background-position: 400px 0; }
}

.float-anim {
  animation: float 5s ease-in-out infinite;
}

/* ---------- Animated Counter ---------- */
[data-counter] {
  font-variant-numeric: tabular-nums;
}

/* ---------- Loading Skeleton ---------- */
.skeleton {
  background: linear-gradient(90deg, var(--color-border) 25%, var(--skeleton-highlight) 37%, var(--color-border) 63%);
  background-size: 400px 100%;
  animation: shimmer 1.4s ease infinite;
  border-radius: var(--radius-sm);
}

/* ---------- Page Loader ---------- */
.page-loader {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg);
  transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.page-loader.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.page-loader .loader-ring {
  width: 48px;
  height: 48px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* ---------- Back To Top ---------- */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: var(--color-dark);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all var(--transition-base);
  z-index: 60;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-primary);
  transform: translateY(-4px);
}

/* ---------- Responsive Breakpoints Reference ----------
   576px  Mobile
   768px  Tablet
   992px  Laptop
   1200px Desktop
   1440px Large Desktop
------------------------------------------------------- */
@media (max-width: 992px) {
  .container { padding-inline: 20px; }
}

@media (max-width: 576px) {
  .container { padding-inline: 16px; }
  html { font-size: 15px; }
}