/* ======================================================
  BASE PRO CSS
  Global Foundation System
  Brand: Green (Trust) + Orange (Energy)
  Author: Amit Ku Yadav
  Sections: tokens | reset | typography | utilities | themes | motion
====================================================== */

html {
  scroll-behavior: smooth;
}

/* ======================================================
   1. DESIGN TOKENS (PRO BRAND SYSTEM)
====================================================== */

:root {

  /* Layout */
  --container: 1100px;

  /* Spacing */
  --space-xs: 8px;
  --space-sm: 12px;
  --space-md: 24px;
  --space-lg: 48px;
  --space-xl: 80px;

  /* Radius & Effects */
  --radius: 18px;
  --blur: 18px;

  /* Typography Colors */
  --text-primary: #111;
  --text-secondary: #333;
  --text-muted: #555;

  --text-dark: #111;
  --text-light: #e5e5e5;

  /* Brand Core */
  --brand-green: #046A38;
  --brand-green-deep: #034f2a;
  --brand-green-soft: rgba(4,106,56,0.15);

  --brand-orange: #FF671F;
  --brand-orange-deep: #e55a16;
  --brand-orange-soft: rgba(255,103,31,0.15);

  --brand-blue: #000080;

  /* Gradients */
  --gradient-brand: linear-gradient(
    135deg,
    var(--brand-green),
    var(--brand-orange)
  );

  --gradient-soft: linear-gradient(
    135deg,
    var(--brand-green-soft),
    var(--brand-orange-soft)
  );

  /* Card System */
  --card-border-dark: rgba(255,255,255,0.12);
  --card-border-light: rgba(0,0,0,0.12);

  --card-shadow-dark: 0 10px 30px rgba(0,0,0,0.45);
  --card-shadow-light: 0 10px 30px rgba(0,0,0,0.08);
}

/* ======================================================
   2. RESET
====================================================== */

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

::selection {
  background: var(--brand-orange);
  color: #fff;
}

html, body {
  overflow-x: hidden;
}

/* ======================================================
   3. BODY & THEMES
====================================================== */

body {
  font-family:
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    "Helvetica Neue",
    Arial,
    sans-serif;

  font-size: 15px;
  line-height: 1.7;
  letter-spacing: 0.1px;

  min-height: 100vh;
  padding-top: 96px;

  animation: fadeIn 0.35s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Dark Theme */

body.theme-dark {
  background: #000;
  color: var(--text-light);

  --card-bg: #1c1c1e;
  --card-border: var(--card-border-dark);
  --card-shadow: var(--card-shadow-dark);
  --card-text: var(--text-light);
}

/* Light Theme */

body.theme-light {
  background: #fff;
  color: var(--text-dark);

  --card-bg: #ffffff;
  --card-border: var(--card-border-light);
  --card-shadow: var(--card-shadow-light);
  --card-text: var(--text-dark);
}

/* Ambient Dual Brand Glow */

body::after {
  content: "";
  position: fixed;
  inset: -20%;
  background:
    radial-gradient(circle at 20% 30%, var(--brand-green-soft), transparent 50%),
    radial-gradient(circle at 80% 70%, var(--brand-orange-soft), transparent 50%);
  pointer-events: none;
  z-index: -1;
  filter: blur(100px);
}

/* ======================================================
   4. TYPOGRAPHY
====================================================== */

h1, h2, h3 {
  font-weight: 600;
  letter-spacing: -0.2px;
}

h1 {
  font-size: clamp(2rem, 3.5vw, 2.6rem);
  line-height: 1.2;
}

h2 {
  font-size: 1.3rem;
  line-height: 1.35;
}

h3 {
  font-size: 1.05rem;
  line-height: 1.4;
}

p {
  margin-bottom: 0.75em;
  color: var(--text-muted);
}

body.theme-light p {
  color: var(--text-secondary);
}

/* Accent (Gradient Text) */

.accent {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Hero Label */

.hero-label {
  color: var(--brand-green);
  font-size: 0.75rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  opacity: 0.8;
  margin-bottom: 24px;
}

/* ======================================================
   5. ACCESSIBILITY
====================================================== */

.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  background: #000;
  color: #fff;
  padding: 8px 12px;
  border-radius: 6px;
  z-index: 1000;
}

.skip-link:focus {
  top: 16px;
}

/* ======================================================
   6. GLASS SYSTEM (PRO)
====================================================== */

.glass {
  backdrop-filter: blur(var(--blur)) saturate(160%);
  border-radius: var(--radius);
}

body.theme-dark .glass {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.08);
  box-shadow:
    0 8px 32px rgba(0,0,0,0.37),
    0 0 0 1px var(--brand-green-soft);
}

body.theme-light .glass {
  background: rgba(255,255,255,0.6);
  border: 1px solid rgba(0,0,0,0.12);
}

/* ======================================================
   7. BRAND BUTTON UTILITY
====================================================== */

.btn-brand {
  display: inline-block;
  padding: 14px 32px;
  border-radius: 50px;
  background: var(--gradient-brand);
  color: #fff;
  font-weight: 600;
  text-decoration: none;
  transition: 0.3s ease;
}

.btn-brand:hover {
  transform: translateY(-3px);
  box-shadow:
    0 12px 25px rgba(4,106,56,0.3),
    0 8px 20px rgba(255,103,31,0.3);
}

/* ======================================================
   8. RESPONSIVE
====================================================== */

@media (max-width: 768px) {

  body {
    font-size: 14.5px;
  }

  h1 {
    font-size: 1.9rem;
  }

  h2 {
    font-size: 1.15rem;
  }
}
/* ======================================================
   GLOBAL HEADER SYSTEM (STABLE + CLEAN)
====================================================== */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 999;
}

/* Header container */
.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Brand */
.brand-link {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  white-space: nowrap;
}

.logo {
  width: 40px;
  height: 40px;
  object-fit: contain;
}

.brand-name {
  font-size: 0.95rem;
  font-weight: 600;
}

.brand-tagline {
  font-size: 0.75rem;
  opacity: 0.7;
}

/* Nav */
.nav-list {
  list-style: none;
  display: flex;
  gap: 24px;
  margin: 0;
  padding: 0;
}

.nav-list li a {
  text-decoration: none;
  font-size: 0.9rem;
  position: relative;
  padding-bottom: 4px;
  white-space: nowrap;
}

.nav-list li a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0%;
  height: 2px;
  background: var(--gradient-brand);
  transition: width 0.3s ease;
}

.nav-list li a:hover::after,
.nav-list li a.active::after {
  width: 100%;
}

/* Mobile */
@media (max-width: 768px) {

  .header-inner {
    flex-direction: column;
    gap: 12px;
  }

  .nav-list {
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
  }

}