/* ============================================================
   LINKEDGES ENERGY SYSTEMS — CORE DESIGN SYSTEM
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Outfit:wght@300;400;500;600;700;800;900&display=swap');

/* ─── CSS Custom Properties ─────────────────────────────── */
:root {
  /* Brand Colors */
  --white: #ffffff;
  --text-main: #0f172a;
  --text-muted: #475569;
  --deep-blue:    #0B4EA2;
  --blue-light:   #1565C0;
  --blue-dark:    #072E6E;
  --green:        #2DBE45;
  --green-light:  #3DD957;
  --orange:       #FF7A00;
  --orange-light: #FF9A30;
  --dark: #ffffff;
  --dark-2: #f8fafc;
  --dark-3: #f1f5f9;
  --dark-4: #e2e8f0;
  --slate: #64748b;
  --slate-light: #475569;

  /* Glass */
  --glass-bg: rgba(255, 255, 255, 0.8);
  --glass-border: rgba(0, 0, 0, 0.08);
  --glass-bg-2:   rgba(11, 78, 162, 0.15);
  --glass-hover: rgba(255, 255, 255, 1);

  /* Gradients */
  --grad-hero: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 40%, #c8def4 100%);
  --grad-blue:    linear-gradient(135deg, #0B4EA2, #072E6E);
  --grad-green:   linear-gradient(135deg, #2DBE45, #1a8a2e);
  --grad-orange:  linear-gradient(135deg, #FF7A00, #e55f00);
  --grad-card:    linear-gradient(135deg, rgba(255,255,255,0.08), rgba(255,255,255,0.02));
  --grad-section: linear-gradient(180deg, #ffffff 0%, #f8fafc 50%, #ffffff 100%);

  /* Shadows */
  --shadow-sm:    0 2px 12px rgba(0, 0, 0, 0.3);
  --shadow-md:    0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-lg:    0 24px 60px rgba(0, 0, 0, 0.5);
  --shadow-blue:  0 8px 40px rgba(11, 78, 162, 0.4);
  --shadow-green: 0 8px 40px rgba(45, 190, 69, 0.3);
  --shadow-orange:0 8px 40px rgba(255, 122, 0, 0.3);
  --shadow-glow:  0 0 60px rgba(11, 78, 162, 0.5);

  /* Typography */
  --font-primary: 'Outfit', sans-serif;
  --font-secondary: 'Inter', sans-serif;
  --fs-xs:   0.75rem;
  --fs-sm:   0.875rem;
  --fs-base: 1rem;
  --fs-lg:   1.125rem;
  --fs-xl:   1.25rem;
  --fs-2xl:  1.5rem;
  --fs-3xl:  1.875rem;
  --fs-4xl:  2.25rem;
  --fs-5xl:  3rem;
  --fs-6xl:  3.75rem;
  --fs-7xl:  4.5rem;
  --fs-8xl:  6rem;

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

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

  /* Transitions */
  --ease-out:    cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --duration-sm: 200ms;
  --duration-md: 400ms;
  --duration-lg: 700ms;
  --duration-xl: 1000ms;

  /* Z-index */
  --z-base:    1;
  --z-above:   10;
  --z-nav:     100;
  --z-modal:   200;
  --z-top:     300;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
  width: 100%;
}

body {
  font-family: var(--font-secondary);
  background-color: var(--dark);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-overflow-scrolling: touch;
  width: 100%;
  min-width: 320px;
}

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

svg,
canvas,
video,
iframe {
  max-width: 100%;
}

input,
select,
textarea,
button {
  max-width: 100%;
}

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

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

ul, ol {
  list-style: none;
}

/* ─── Typography Scale ──────────────────────────────────── */
.font-primary { font-family: var(--font-primary); }
.font-secondary { font-family: var(--font-secondary); }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-primary);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.5rem, 6vw, var(--fs-8xl)); }
h2 { font-size: clamp(2rem, 4vw, var(--fs-6xl)); }
h3 { font-size: clamp(1.5rem, 3vw, var(--fs-4xl)); }
h4 { font-size: clamp(1.25rem, 2.5vw, var(--fs-3xl)); }
h5 { font-size: var(--fs-xl); }
h6 { font-size: var(--fs-lg); }

p {
  font-size: var(--fs-base);
  color: var(--text-muted);
  line-height: 1.75;
}

/* ─── Container ─────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container-sm {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* ─── Section Base ──────────────────────────────────────── */
.section {
  padding: var(--space-32) 0;
  position: relative;
  overflow: hidden;
}

.section-sm {
  padding: var(--space-20) 0;
  position: relative;
  overflow: hidden;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-16);
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--fs-sm);
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--green);
  background: rgba(45, 190, 69, 0.12);
  border: 1px solid rgba(45, 190, 69, 0.25);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}

.section-tag::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--green);
  border-radius: 50%;
  animation: pulse-dot 2s ease-in-out infinite;
}

.section-title {
  font-size: clamp(2rem, 4vw, var(--fs-6xl));
  font-weight: 800;
  background: linear-gradient(135deg, #0f172a 0%, #334155 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-4);
}

.section-title span {
  background: linear-gradient(135deg, var(--deep-blue) 0%, var(--green) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: var(--fs-lg);
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ─── Glassmorphism Utilities ───────────────────────────── */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
}

.glass-blue {
  background: rgba(11, 78, 162, 0.15);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(11, 78, 162, 0.3);
}

.glass-dark {
  background: rgba(5, 13, 26, 0.8);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

/* ─── Button System ─────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-full);
  font-family: var(--font-primary);
  font-size: var(--fs-base);
  font-weight: 600;
  letter-spacing: 0.02em;
  cursor: pointer;
  border: none;
  transition: all var(--duration-md) var(--ease-out);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
  text-decoration: none;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.1);
  opacity: 0;
  transition: opacity var(--duration-sm) ease;
  border-radius: inherit;
}

.btn:hover::before { opacity: 1; }

.btn-primary {
  background: var(--grad-blue);
  color: var(--white);
  box-shadow: var(--shadow-blue);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 50px rgba(11, 78, 162, 0.6);
}

.btn-secondary {
  background: transparent;
  color: var(--text-main);
  border: 1.5px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  border-color: rgba(255, 255, 255, 0.6);
  background: rgba(255, 255, 255, 0.08);
  transform: translateY(-2px);
}

.btn-green {
  background: var(--grad-green);
  color: var(--white);
  box-shadow: var(--shadow-green);
}

.btn-green:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 50px rgba(45, 190, 69, 0.5);
}

.btn-orange {
  background: var(--grad-orange);
  color: var(--white);
  box-shadow: var(--shadow-orange);
}

.btn-orange:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 50px rgba(255, 122, 0, 0.5);
}

.btn-lg {
  padding: var(--space-4) var(--space-10);
  font-size: var(--fs-lg);
}

.btn-sm {
  padding: var(--space-2) var(--space-6);
  font-size: var(--fs-sm);
}

.btn-icon {
  width: 20px;
  height: 20px;
  transition: transform var(--duration-sm) var(--ease-spring);
}

.btn:hover .btn-icon { transform: translateX(4px); }

/* ─── Badge / Label ─────────────────────────────────────── */
.badge {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.badge-blue { background: rgba(11, 78, 162, 0.2); color: #6fa8ff; border: 1px solid rgba(11, 78, 162, 0.4); }
.badge-green { background: rgba(45, 190, 69, 0.15); color: #5ddb72; border: 1px solid rgba(45, 190, 69, 0.3); }
.badge-orange { background: rgba(255, 122, 0, 0.15); color: #ffa040; border: 1px solid rgba(255, 122, 0, 0.3); }

/* ─── Gradient Text ─────────────────────────────────────── */
.gradient-text {
  background: linear-gradient(135deg, var(--white) 0%, var(--slate-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.gradient-text-blue {
  background: linear-gradient(135deg, #6fa8ff, var(--deep-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.gradient-text-green {
  background: linear-gradient(135deg, var(--green-light), var(--green));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.gradient-text-orange {
  background: linear-gradient(135deg, var(--orange-light), var(--orange));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ─── Divider ───────────────────────────────────────────── */
.divider {
  width: 60px;
  height: 3px;
  background: var(--grad-blue);
  border-radius: var(--radius-full);
  margin: var(--space-4) auto;
}

.divider-left { margin-left: 0; }

/* ─── Grid System ───────────────────────────────────────── */
.grid { display: grid; }
.grid-2 { grid-template-columns: repeat(2, 1fr); gap: var(--space-8); }
.grid-3 { grid-template-columns: repeat(3, 1fr); gap: var(--space-8); }
.grid-4 { grid-template-columns: repeat(4, 1fr); gap: var(--space-6); }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-col { flex-direction: column; }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* ─── Background Sections ───────────────────────────────── */
.bg-dark { background-color: var(--dark); }
.bg-dark-2 { background-color: var(--dark-2); }
.bg-dark-3 { background-color: var(--dark-3); }
.bg-gradient { background: var(--grad-section); }

/* ─── Separator Lines ───────────────────────────────────── */
.section-line {
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.08), transparent);
}

/* ─── Stats / Counter ───────────────────────────────────── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
}

.stat-item {
  text-align: center;
  padding: var(--space-6);
}

.stat-number {
  font-family: var(--font-primary);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 900;
  line-height: 1;
  background: linear-gradient(135deg, var(--white), var(--green));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-2);
}

.stat-label {
  font-size: var(--fs-sm);
  color: var(--slate);
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* ─── Image Utilities ───────────────────────────────────── */
.img-cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.img-rounded { border-radius: var(--radius-xl); }

/* ─── Glow Effects ──────────────────────────────────────── */
.glow-blue {
  box-shadow: 0 0 40px rgba(11, 78, 162, 0.4);
}

.glow-green {
  box-shadow: 0 0 40px rgba(45, 190, 69, 0.3);
}

.glow-orange {
  box-shadow: 0 0 40px rgba(255, 122, 0, 0.3);
}

/* ─── Overlay Utilities ─────────────────────────────────── */
.overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.overlay-dark {
  background: linear-gradient(to top, rgba(5,13,26,0.95) 0%, rgba(5,13,26,0.5) 50%, transparent 100%);
}

.overlay-left {
  background: linear-gradient(to right, var(--dark) 0%, transparent 60%);
}

/* ─── Scrollbar ─────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--dark); }
::-webkit-scrollbar-thumb {
  background: var(--deep-blue);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover { background: var(--blue-light); }

/* ─── Selection ─────────────────────────────────────────── */
::selection {
  background: rgba(11, 78, 162, 0.4);
  color: var(--text-main);
}

/* ─── Loader ─────────────────────────────────────────────── */
#page-loader {
  position: fixed;
  inset: 0;
  background: var(--dark);
  z-index: var(--z-top);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: var(--space-6);
  transition: opacity 0.6s ease, visibility 0.6s ease;
}

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

.loader-logo {
  font-family: var(--font-primary);
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.loader-logo span { color: var(--green); }

.loader-bar {
  width: 200px;
  height: 2px;
  background: rgba(255,255,255,0.1);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.loader-progress {
  height: 100%;
  background: linear-gradient(90deg, var(--deep-blue), var(--green));
  border-radius: var(--radius-full);
  animation: loader-fill 1.8s var(--ease-out) forwards;
}

/* ─── Responsive ─────────────────────────────────────────── */
@media (max-width: 1200px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 900px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .section { padding: var(--space-20) 0; }
}

@media (max-width: 600px) {
  .grid-4 { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .btn-lg { padding: var(--space-4) var(--space-8); font-size: var(--fs-base); }
  :root { --space-32: 5rem; --space-24: 4rem; }
}