/* ==========================================================================
   VerdeIoT Showcase Site - Premium White Theme & Modern Design System
   ========================================================================== */

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

:root {
  /* White Theme Color Palette */
  --bg-body: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-subtle: #f1f5f9;
  --bg-card: rgba(255, 255, 255, 0.88);
  --bg-card-hover: rgba(255, 255, 255, 1);
  
  --border-subtle: #e2e8f0;
  --border-hover: #cbd5e1;
  --border-emerald: rgba(16, 185, 129, 0.35);
  
  /* Brand Emerald Accents */
  --emerald-primary: #10b981;
  --emerald-hover: #059669;
  --emerald-dark: #047857;
  --emerald-light: #ecfdf5;
  --emerald-glow: rgba(16, 185, 129, 0.16);
  
  /* Supporting Accents */
  --cyan-accent: #0891b2;
  --cyan-light: #ecfeff;
  --amber-accent: #d97706;
  --amber-light: #fffbeb;
  --indigo-accent: #4f46e5;
  --indigo-light: #eef2ff;
  
  /* High-Contrast Typography (Slate System) */
  --text-main: #0f172a;       /* slate-900 */
  --text-body: #334155;       /* slate-700 */
  --text-muted: #64748b;      /* slate-500 */
  --text-subtle: #94a3b8;     /* slate-400 */
  
  /* Geometry & Elevation */
  --radius-lg: 1.25rem;
  --radius-md: 0.875rem;
  --radius-sm: 0.5rem;
  
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
  --shadow-card: 0 10px 30px -5px rgba(15, 23, 42, 0.05), 0 2px 6px rgba(15, 23, 42, 0.02);
  --shadow-glow: 0 20px 40px -10px rgba(16, 185, 129, 0.18), 0 4px 12px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 25px 50px -12px rgba(15, 23, 42, 0.1);
}

/* Base Reset & Smooth Scrolling */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  scroll-behavior: smooth;
}

body {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-body);
  color: var(--text-body);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, .font-heading {
  font-family: 'Outfit', sans-serif;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

/* Custom Scrollbar for Light Mode */
::-webkit-scrollbar {
  width: 9px;
}
::-webkit-scrollbar-track {
  background: var(--bg-body);
}
::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 4px;
  border: 2px solid var(--bg-body);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--emerald-primary);
}

/* Layout Container */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Ambient Background Light Blobs */
.bg-ambient-blob-1 {
  position: absolute;
  top: -120px;
  right: -100px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(16, 185, 129, 0.12) 0%, rgba(248, 250, 252, 0) 70%);
  z-index: -1;
  pointer-events: none;
}

.bg-ambient-blob-2 {
  position: absolute;
  top: 40%;
  left: -200px;
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.08) 0%, rgba(248, 250, 252, 0) 70%);
  z-index: -1;
  pointer-events: none;
}

/* Glassmorphism White Theme Cards */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.glass-card:hover {
  border-color: var(--border-emerald);
  box-shadow: var(--shadow-glow);
  transform: translateY(-4px);
  background: var(--bg-card-hover);
}

/* Header & Navbar */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: all 0.3s ease;
}

nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
  text-decoration: none;
}

.logo-icon {
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--emerald-primary), var(--emerald-hover));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.35);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2.25rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-body);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: color 0.2s ease;
  position: relative;
}

.nav-links a:hover {
  color: var(--emerald-primary);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--emerald-primary);
  transition: width 0.25s ease;
  border-radius: 2px;
}

.nav-links a:hover::after {
  width: 100%;
}

/* Mobile Navigation Toggle */
.mobile-menu-btn {
  display: none;
  background: transparent;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.5rem;
  cursor: pointer;
  color: var(--text-main);
}

/* Buttons System */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.8rem 1.6rem;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  outline: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--emerald-primary), var(--emerald-hover));
  color: white;
  box-shadow: 0 4px 16px rgba(16, 185, 129, 0.32);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(16, 185, 129, 0.45);
  background: linear-gradient(135deg, #059669, #047857);
}

.btn-secondary {
  background: var(--bg-surface);
  color: var(--text-main);
  border: 1px solid var(--border-hover);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: var(--bg-surface-subtle);
  border-color: var(--emerald-primary);
  color: var(--emerald-dark);
  transform: translateY(-2px);
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  background-color: var(--emerald-light);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: var(--emerald-dark);
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
}

.gradient-text {
  background: linear-gradient(135deg, var(--emerald-dark), var(--emerald-primary), var(--cyan-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Hero Section */
.hero {
  padding: 170px 0 100px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.hero-title {
  font-size: 3.25rem;
  line-height: 1.15;
  font-weight: 800;
  margin-bottom: 1.25rem;
  color: var(--text-main);
}

.hero-desc {
  font-size: 1.125rem;
  color: var(--text-muted);
  margin-bottom: 2.25rem;
  max-width: 540px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Hero Interactive Mockup Frame (White Theme Dashboard Window) */
.hero-mockup {
  position: relative;
}

.dashboard-preview {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  transition: all 0.3s ease;
}

.mock-header {
  background: var(--bg-surface-subtle);
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.mock-dots {
  display: flex;
  gap: 0.4rem;
}

.dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}
.dot-red { background: #ef4444; }
.dot-yellow { background: #f59e0b; }
.dot-green { background: #10b981; }

.preview-grid {
  padding: 1.5rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.metric-card {
  background: var(--bg-body);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.metric-card:hover {
  border-color: var(--emerald-primary);
  transform: translateY(-2px);
}

.metric-val {
  font-size: 1.75rem;
  font-weight: 800;
  line-height: 1;
}

/* Features Section */
.features {
  padding: 100px 0;
  position: relative;
}

.section-title {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 4rem auto;
}

.section-title h2 {
  font-size: 2.35rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.section-title p {
  font-size: 1.1rem;
  color: var(--text-muted);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 2rem;
}

.feature-card {
  padding: 2.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.feature-icon {
  width: 52px;
  height: 52px;
  background: var(--emerald-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--emerald-dark);
  border: 1px solid rgba(16, 185, 129, 0.25);
  margin-bottom: 0.5rem;
}

.feature-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.65;
}

/* Simulator Section */
.simulator {
  padding: 100px 0;
  background: linear-gradient(180deg, var(--bg-body) 0%, #ffffff 100%);
}

.sim-box {
  padding: 3rem;
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.sim-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
}

.sim-input label {
  display: block;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text-main);
  font-size: 0.95rem;
}

.sim-input input[type="range"] {
  width: 100%;
  height: 8px;
  background: var(--border-subtle);
  border-radius: 4px;
  outline: none;
  accent-color: var(--emerald-primary);
  cursor: pointer;
}

.sim-results {
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 2rem;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  text-align: center;
}

/* Architecture Section */
.architecture {
  padding: 100px 0;
}

.arch-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2rem;
}

.arch-card {
  padding: 2rem;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1rem;
}

.arch-card h4 {
  font-size: 1.15rem;
  font-weight: 700;
}

.arch-card p {
  font-size: 0.92rem;
  color: var(--text-muted);
}

/* SEO FAQ Accordion Section */
.faq-section {
  padding: 100px 0;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.faq-list {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.faq-item {
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  background: var(--bg-body);
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.faq-item:hover {
  border-color: var(--emerald-primary);
}

.faq-question {
  width: 100%;
  padding: 1.25rem 1.5rem;
  text-align: left;
  background: transparent;
  border: none;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}

.faq-answer {
  padding: 0 1.5rem 1.25rem 1.5rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.65;
  display: none;
}

.faq-item.active .faq-answer {
  display: block;
}

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

.faq-icon {
  transition: transform 0.3s ease;
  color: var(--emerald-primary);
}

/* Footer */
footer {
  background: var(--bg-surface);
  padding: 80px 0 40px 0;
  border-top: 1px solid var(--border-subtle);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 4rem;
  margin-bottom: 4rem;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-top: 1rem;
  max-width: 380px;
}

.footer-col h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  color: var(--text-main);
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-col a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.92rem;
  transition: color 0.2s ease;
}

.footer-col a:hover {
  color: var(--emerald-primary);
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-subtle);
  font-size: 0.88rem;
}

/* Mobile Responsiveness */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .sim-controls {
    grid-template-columns: 1fr;
  }
  
  .sim-results {
    grid-template-columns: 1fr 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 80px;
    left: 0;
    width: 100%;
    background: var(--bg-surface);
    flex-direction: column;
    padding: 2rem;
    border-bottom: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-lg);
    display: none;
  }

  .nav-links.mobile-active {
    display: flex;
  }

  .mobile-menu-btn {
    display: block;
  }

  .sim-results {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}