/* ============================================
   Gutin Technology Global Website Stylesheet
   Theme: Deep Space Blue + Metallic Silver
   Design: German Minimalist Engineering Aesthetic
   ============================================ */

/* CSS Variables */
:root {
  --primary-blue: #0a1628;
  --secondary-blue: #1a2d4a;
  --accent-blue: #2e5c9e;
  --light-blue: #4a8fd4;
  --silver: #c0c0c0;
  --metallic-silver: #e8e8e8;
  --dark-silver: #8899aa;
  --white: #ffffff;
  --off-white: #f5f7fa;
  --text-dark: #1a1a2e;
  --text-light: #6b7280;
  --text-muted: #9ca3af;
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --gradient-blue: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 50%, var(--accent-blue) 100%);
  --gradient-silver: linear-gradient(135deg, var(--metallic-silver) 0%, var(--silver) 50%, var(--dark-silver) 100%);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--text-dark);
  background: var(--white);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: var(--accent-blue);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--light-blue);
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-dark);
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 3vw, 1.75rem); }
h4 { font-size: clamp(1.1rem, 2vw, 1.35rem); }

p {
  margin-bottom: 1rem;
  color: var(--text-light);
}

/* Container */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container-narrow {
  max-width: 960px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
  border: 2px solid transparent;
  gap: 0.5rem;
}

.btn-primary {
  background: var(--gradient-blue);
  color: var(--white);
  border-color: transparent;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: var(--white);
}

.btn-secondary {
  background: transparent;
  color: var(--accent-blue);
  border-color: var(--accent-blue);
}

.btn-secondary:hover {
  background: var(--accent-blue);
  color: var(--white);
}

.btn-gold {
  background: linear-gradient(135deg, #c9a962 0%, #d4af37 50%, #c9a962 100%);
  color: var(--primary-blue);
  border-color: transparent;
  font-weight: 700;
}

.btn-gold:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(201, 169, 98, 0.4);
  color: var(--primary-blue);
}

.btn-large {
  padding: 1rem 2rem;
  font-size: 1.1rem;
}

/* Header & Navigation */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 22, 40, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--white);
  font-weight: 700;
  font-size: 1.25rem;
}

.logo img {
  height: 40px;
  width: auto;
}

.nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav a {
  color: var(--metallic-silver);
  font-size: 0.9rem;
  font-weight: 500;
  position: relative;
}

.nav a:hover,
.nav a.active {
  color: var(--white);
}

.nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--light-blue);
  transition: var(--transition);
}

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

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

.lang-switcher {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  background: rgba(255,255,255,0.1);
  border-radius: var(--radius-md);
  padding: 0.25rem;
}

.lang-switcher a {
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--dark-silver);
  border-radius: var(--radius-sm);
}

.lang-switcher a.active,
.lang-switcher a:hover {
  background: var(--accent-blue);
  color: var(--white);
}

.lang-switcher a.lang-hk {
  cursor: not-allowed;
  opacity: 0.85;
}

.lang-switcher a.lang-hk::before {
  content: "🇭🇰 ";
  margin-right: 0.15rem;
  font-style: normal;
  /* HK flag emoji - this is a regional flag indicator, not a sovereignty claim */
  font-size: 0.9em;
}

.lang-switcher a .flag {
  font-size: 0.95em;
  margin-right: 0.25rem;
  line-height: 1;
  font-style: normal;
  display: inline-block;
  vertical-align: -0.05em;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--white);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero Section */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--gradient-blue);
  overflow: hidden;
  padding-top: 70px;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('../images/hero-pattern.svg') center/cover;
  opacity: 0.05;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 700px;
}

.hero h1 {
  color: var(--white);
  margin-bottom: 1.5rem;
  line-height: 1.1;
}

.hero h1 span {
  color: var(--light-blue);
}

.hero p {
  color: var(--dark-silver);
  font-size: 1.15rem;
  margin-bottom: 2rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero-image {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 50%;
  max-width: 700px;
  opacity: 0.9;
}

/* Section Base */
.section {
  padding: 5rem 0;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 3rem;
}

.section-header h2 {
  margin-bottom: 1rem;
}

.section-header p {
  font-size: 1.1rem;
}

.section-dark {
  background: var(--primary-blue);
  color: var(--white);
}

.section-dark h2,
.section-dark h3 {
  color: var(--white);
}

.section-dark p {
  color: var(--dark-silver);
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  border: 1px solid rgba(0,0,0,0.05);
}

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

.card-icon {
  width: 60px;
  height: 60px;
  background: var(--gradient-blue);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
}

.card h3 {
  margin-bottom: 0.75rem;
  font-size: 1.25rem;
}

.card p {
  margin-bottom: 0;
  font-size: 0.95rem;
}

/* Feature Cards with Image */
.feature-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

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

.feature-card img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.feature-card-content {
  padding: 1.5rem;
}

.feature-card-content h3 {
  margin-bottom: 0.5rem;
}

.feature-card-content p {
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

/* Tags */
.tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.tag-german {
  background: linear-gradient(135deg, #c9a962 0%, #d4af37 100%);
  color: var(--primary-blue);
}

.tag-blue {
  background: var(--light-blue);
  color: var(--white);
}

/* Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: 3rem;
  font-weight: 800;
  color: var(--light-blue);
  line-height: 1;
}

.stat-label {
  color: var(--dark-silver);
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

/* Timeline */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--gradient-blue);
}

.timeline-item {
  position: relative;
  padding-bottom: 2rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -2rem;
  top: 0.5rem;
  width: 12px;
  height: 12px;
  background: var(--accent-blue);
  border-radius: 50%;
  transform: translateX(-5px);
  border: 2px solid var(--white);
  box-shadow: 0 0 0 2px var(--accent-blue);
}

.timeline-year {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-blue);
  margin-bottom: 0.25rem;
}

.timeline-title {
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 0.5rem;
}

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

/* Accordion */
.accordion-item {
  border-bottom: 1px solid rgba(0,0,0,0.1);
}

.accordion-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 0;
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition);
}

.accordion-header:hover {
  color: var(--accent-blue);
}

.accordion-icon {
  transition: var(--transition);
  font-size: 1.25rem;
}

.accordion-item.open .accordion-icon {
  transform: rotate(180deg);
}

.accordion-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.accordion-item.open .accordion-body {
  max-height: 500px;
}

.accordion-body-inner {
  padding-bottom: 1.25rem;
  color: var(--text-light);
}

/* Forms */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-dark);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid #d1d5db;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  transition: var(--transition);
  background: var(--white);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(46, 92, 158, 0.1);
}

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

/* Calculator Tools */
.calculator-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-md);
  margin-bottom: 2rem;
}

.calculator-card h3 {
  margin-bottom: 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--metallic-silver);
}

.calc-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1rem;
}

.calc-result {
  background: var(--off-white);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin-top: 1.5rem;
}

.calc-result h4 {
  color: var(--accent-blue);
  margin-bottom: 0.75rem;
}

/* Tables */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
}

.data-table th,
.data-table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid #e5e7eb;
}

.data-table th {
  background: var(--primary-blue);
  color: var(--white);
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.data-table tr:hover td {
  background: var(--off-white);
}

/* Footer */
.footer {
  background: var(--primary-blue);
  color: var(--dark-silver);
  padding: 4rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand {
  max-width: 300px;
}

.footer-brand h3 {
  color: var(--white);
  margin-bottom: 1rem;
}

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

.footer-column h4 {
  color: var(--white);
  font-size: 1rem;
  margin-bottom: 1.25rem;
}

.footer-column ul {
  list-style: none;
}

.footer-column li {
  margin-bottom: 0.75rem;
}

.footer-column a {
  color: var(--dark-silver);
  font-size: 0.9rem;
}

.footer-column a:hover {
  color: var(--white);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-bottom p {
  font-size: 0.85rem;
  margin: 0;
}

.footer-legal {
  display: flex;
  gap: 1.5rem;
}

.footer-legal a {
  font-size: 0.85rem;
  color: var(--dark-silver);
}

/* Cookie Banner */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--primary-blue);
  color: var(--white);
  padding: 1.5rem;
  z-index: 9999;
  box-shadow: 0 -4px 20px rgba(0,0,0,0.2);
  display: none;
}

.cookie-banner.show {
  display: block;
}

.cookie-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}

.cookie-inner p {
  margin: 0;
  color: var(--dark-silver);
  font-size: 0.9rem;
}

.cookie-inner a {
  color: var(--light-blue);
}

.cookie-actions {
  display: flex;
  gap: 0.75rem;
}

/* Back to Top */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  background: var(--accent-blue);
  color: var(--white);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--light-blue);
  transform: translateY(-2px);
}

/* Breadcrumb */
.breadcrumb {
  background: var(--off-white);
  padding: 1rem 0;
  border-bottom: 1px solid #e5e7eb;
}

.breadcrumb-inner {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-light);
}

.breadcrumb-inner a {
  color: var(--text-light);
}

.breadcrumb-inner a:hover {
  color: var(--accent-blue);
}

/* Responsive */
@media (max-width: 1024px) {
  .nav {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--primary-blue);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1rem;
  }

  .nav.show {
    display: flex;
  }

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

  .hero-image {
    display: none;
  }

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

@media (max-width: 768px) {
  .section {
    padding: 3rem 0;
  }

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

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

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

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

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

  .hero-buttons {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }
}

/* Print */
@media print {
  .header,
  .footer,
  .cookie-banner,
  .back-to-top {
    display: none !important;
  }
}