/* ============================================
   Tier4 Cloud - Main Stylesheet
   ============================================ */

:root {
  --primary: #0055aa;
  --primary-dark: #003d7a;
  --primary-light: #e8f2ff;
  --accent: #00ccff;
  --accent-glow: rgba(0, 204, 255, 0.15);
  --text: #1a1a2e;
  --text-light: #6b7280;
  --text-lighter: #9ca3af;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --bg-dark: #0a0f1c;
  --border: #e5e7eb;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.1);
  --transition: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

ul {
  list-style: none;
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================
   Buttons
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition);
  border: 2px solid transparent;
  cursor: pointer;
  gap: 8px;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.btn-primary:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 85, 170, 0.3);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.4);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: #fff;
}

.btn-block {
  width: 100%;
  text-align: center;
}

.btn-lg {
  padding: 16px 40px;
  font-size: 1.05rem;
}

/* ============================================
   Navbar
   ============================================ */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: transparent;
  transition: all var(--transition);
  padding: 16px 0;
}

.navbar.sticky {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
  padding: 10px 0;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.5rem;
  font-weight: 800;
}

.logo-icon {
  font-size: 1.8rem;
  color: var(--accent);
}

.navbar:not(.sticky) .logo-text {
  color: #fff;
}

.navbar.sticky .logo-text {
  color: var(--text);
}

.logo-accent {
  color: var(--accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition);
  position: relative;
}

.navbar:not(.sticky) .nav-links a {
  color: rgba(255, 255, 255, 0.85);
}

.navbar:not(.sticky) .nav-links a:hover,
.navbar:not(.sticky) .nav-links a.active {
  color: #fff;
}

.navbar.sticky .nav-links a {
  color: var(--text-light);
}

.navbar.sticky .nav-links a:hover,
.navbar.sticky .nav-links a.active {
  color: var(--primary);
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}

.nav-cta {
  padding: 10px 24px;
  font-size: 0.9rem;
}

/* Mobile Toggle */
.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.mobile-toggle span {
  width: 24px;
  height: 2px;
  background: #fff;
  transition: all var(--transition);
  border-radius: 2px;
}

.navbar.sticky .mobile-toggle span {
  background: var(--text);
}

/* ============================================
   Hero
   ============================================ */

.hero {
  background: linear-gradient(135deg, #0a0f1c 0%, #0d2847 40%, #0055aa 100%);
  padding: 160px 0 100px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-content h1 {
  font-size: 3.2rem;
  font-weight: 800;
  color: #fff;
  line-height: 1.15;
  margin-bottom: 20px;
}

.hero-content p {
  font-size: 1.15rem;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.7;
  margin-bottom: 32px;
  max-width: 500px;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* Hero Graphic */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-graphic {
  position: relative;
  width: 320px;
  height: 320px;
}

.cloud-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 8rem;
  color: var(--accent);
  opacity: 0.15;
  filter: blur(1px);
}

.floating-nodes .node {
  position: absolute;
  border-radius: 50%;
  background: var(--accent);
  animation: float 6s ease-in-out infinite;
}

.node-1 {
  width: 80px;
  height: 80px;
  top: 20px;
  left: 40px;
  opacity: 0.15;
  animation-delay: 0s !important;
}

.node-2 {
  width: 60px;
  height: 60px;
  top: 60px;
  right: 30px;
  opacity: 0.25;
  animation-delay: 1.5s !important;
}

.node-3 {
  width: 100px;
  height: 100px;
  bottom: 40px;
  left: 80px;
  opacity: 0.1;
  animation-delay: 3s !important;
}

.node-4 {
  width: 40px;
  height: 40px;
  bottom: 80px;
  right: 70px;
  opacity: 0.3;
  animation-delay: 4.5s !important;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}

/* ============================================
   Section Common
   ============================================ */

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 12px;
}

.section-subtitle {
  text-align: center;
  color: var(--text-light);
  font-size: 1.05rem;
  max-width: 560px;
  margin: 0 auto 48px;
}

/* ============================================
   Features
   ============================================ */

.features {
  padding: 100px 0;
  background: var(--bg-alt);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  transition: all var(--transition);
}

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

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.feature-card p {
  color: var(--text-light);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ============================================
   Services
   ============================================ */

.services {
  padding: 100px 0;
}

.services-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 48px;
  align-items: start;
}

.services-sidebar {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.service-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-light);
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  font-family: inherit;
}

.service-link:hover {
  background: var(--primary-light);
  color: var(--primary);
}

.service-link.active {
  background: var(--primary);
  color: #fff;
}

.service-icon {
  font-size: 1.2rem;
  width: 28px;
  text-align: center;
}

.services-detail h2 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.services-detail > p {
  color: var(--text-light);
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: 32px;
}

.services-highlights {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.highlight {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 20px 24px;
  background: var(--bg-alt);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent);
}

.highlight strong {
  font-size: 1rem;
  font-weight: 700;
}

.highlight span {
  color: var(--text-light);
  font-size: 0.9rem;
}

/* ============================================
   Pricing
   ============================================ */

.pricing {
  padding: 100px 0;
  background: var(--bg-alt);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: start;
}

.pricing-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 28px;
  transition: all var(--transition);
  position: relative;
}

.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.pricing-card.featured {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

.pricing-card.featured::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: var(--radius) var(--radius) 0 0;
}

.pricing-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.pricing-header h3 {
  font-size: 1.2rem;
  font-weight: 700;
}

.pricing-badge {
  background: var(--primary-light);
  color: var(--primary);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 20px;
}

.pricing-amount {
  display: flex;
  align-items: baseline;
  gap: 2px;
  margin-bottom: 28px;
}

.currency {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
}

.price {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--text);
  line-height: 1;
}

.period {
  font-size: 1rem;
  color: var(--text-light);
  font-weight: 500;
}

.pricing-features {
  margin-bottom: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.pricing-features li {
  font-size: 0.95rem;
  color: var(--text-light);
  padding-left: 28px;
  position: relative;
}

.pricing-features li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: 700;
}

/* ============================================
   Locations
   ============================================ */

.locations {
  padding: 100px 0;
}

.locations-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.location-group {
  background: var(--bg-alt);
  border-radius: var(--radius);
  padding: 32px 28px;
  border: 1px solid var(--border);
}

.location-group h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--accent);
}

.location-group ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.location-group li {
  color: var(--text-light);
  font-size: 0.95rem;
  padding-left: 20px;
  position: relative;
}

.location-group li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: 700;
}

/* ============================================
   CTA
   ============================================ */

.cta {
  background: linear-gradient(135deg, #0a0f1c 0%, #0055aa 100%);
  padding: 80px 0;
  text-align: center;
}

.cta h2 {
  font-size: 2rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.cta p {
  color: rgba(255, 255, 255, 0.7);
  font-size: 1.05rem;
  margin-bottom: 32px;
}

/* ============================================
   Page Hero (Contact page)
   ============================================ */

.page-hero {
  background: linear-gradient(135deg, #0a0f1c 0%, #0d2847 40%, #0055aa 100%);
  padding: 160px 0 80px;
  text-align: center;
}

.page-hero h1 {
  font-size: 2.8rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 12px;
}

.page-hero p {
  color: rgba(255, 255, 255, 0.7);
  font-size: 1.1rem;
  max-width: 520px;
  margin: 0 auto;
}

/* ============================================
   Contact Section
   ============================================ */

.contact-section {
  padding: 80px 0 100px;
}

.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

.contact-info h2 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.contact-info > p {
  color: var(--text-light);
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: 32px;
}

.info-cards {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.info-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px;
  background: var(--bg-alt);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.info-icon {
  font-size: 1.8rem;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.info-card strong {
  display: block;
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 2px;
}

.info-card span {
  color: var(--text-light);
  font-size: 0.9rem;
}

/* Contact Form */
.contact-form-wrapper {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px;
  box-shadow: var(--shadow-md);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
}

.required {
  color: #ef4444;
}

.form-group input,
.form-group select,
.form-group textarea {
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--text);
  background: var(--bg);
  transition: border-color var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0, 85, 170, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* Alerts */
.alert {
  padding: 16px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  margin-bottom: 20px;
}

.alert-success {
  background: #ecfdf5;
  color: #065f46;
  border: 1px solid #a7f3d0;
}

.alert-error {
  background: #fef2f2;
  color: #991b1b;
  border: 1px solid #fecaca;
}

/* ============================================
   Footer
   ============================================ */

.footer {
  background: var(--bg-dark);
  padding: 60px 0 0;
  color: rgba(255, 255, 255, 0.7);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer .logo-text {
  color: #fff;
}

.footer-brand p {
  margin-top: 16px;
  font-size: 0.9rem;
  line-height: 1.7;
}

.footer-social {
  display: flex;
  gap: 12px;
  margin-top: 20px;
}

.footer-social a {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  font-size: 0.9rem;
  font-weight: 700;
  transition: all var(--transition);
}

.footer-social a:hover {
  background: var(--primary);
}

.footer-links h4 {
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-size: 0.9rem;
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--accent);
}

.footer-bottom {
  padding: 24px 0;
  text-align: center;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.4);
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 1024px) {
  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-content p {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-buttons {
    justify-content: center;
  }

  .hero-visual {
    display: none;
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .services-layout {
    grid-template-columns: 1fr;
  }

  .services-sidebar {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
  }

  .service-link {
    padding: 10px 16px;
    font-size: 0.85rem;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg);
    padding: 20px 24px;
    gap: 0;
    box-shadow: var(--shadow-md);
    border-top: 1px solid var(--border);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    color: var(--text) !important;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
  }

  .nav-links a:last-child {
    border-bottom: none;
  }

  .nav-cta {
    display: none;
  }

  .mobile-toggle {
    display: flex;
  }

  .mobile-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .mobile-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .mobile-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .hero {
    padding: 140px 0 80px;
  }

  .hero-content h1 {
    font-size: 2.2rem;
  }

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

  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
  }

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

  .contact-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .page-hero h1 {
    font-size: 2rem;
  }

  .section-title {
    font-size: 1.8rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}