/* ============================================================================
   OrbitaVision Geospatial - Digital Astral Aesthetics
   核心色系：深空軌道黑 (#010409)、衛星數據青 (#00E5FF)、地形高度琥珀 (#FFB300)、雲端純淨白 (#F0F6FC)
   排版：現代無襯線體 + 等寬細體
   視覺主題：發光網格、向量點雲、衛星掃描線、通透儀表板
   ============================================================================ */

/* 根本色系與排版定義 */
:root {
  /* 核心色系 */
  --color-deep-black: #010409;
  --color-satellite-cyan: #00E5FF;
  --color-terrain-amber: #FFB300;
  --color-cloud-white: #F0F6FC;
  
  /* 補充色系 */
  --color-deep-navy: #0a1428;
  --color-dark-slate: #1a2332;
  --color-grid-gray: #2d3748;
  --color-accent-purple: #8b5cf6;
  --color-accent-green: #10b981;
  
  /* 排版 */
  --font-display: 'Orbitron', 'Courier New', monospace;
  --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;
  
  /* 間距 */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* 陰影與深度 */
  --shadow-sm: 0 2px 4px rgba(0, 229, 255, 0.1);
  --shadow-md: 0 4px 12px rgba(0, 229, 255, 0.15);
  --shadow-lg: 0 8px 24px rgba(0, 229, 255, 0.2);
  --shadow-glow: 0 0 20px rgba(0, 229, 255, 0.3), 0 0 40px rgba(0, 229, 255, 0.1);
  
  /* 過渡與動畫 */
  --transition-fast: 0.2s ease-in-out;
  --transition-normal: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;
}

/* 全局重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-deep-black);
  color: var(--color-cloud-white);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
}

/* 排版層級 */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-lg);
  color: var(--color-cloud-white);
  text-transform: uppercase;
}

h1 {
  font-size: 3.5rem;
  line-height: 1.2;
  text-shadow: 0 0 30px rgba(0, 229, 255, 0.5);
}

h2 {
  font-size: 2.5rem;
  line-height: 1.3;
  text-shadow: 0 0 20px rgba(0, 229, 255, 0.3);
}

h3 {
  font-size: 1.75rem;
  line-height: 1.4;
}

h4 {
  font-size: 1.25rem;
}

h5, h6 {
  font-size: 1rem;
}

p {
  margin-bottom: var(--spacing-md);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.8;
}

a {
  color: var(--color-satellite-cyan);
  text-decoration: none;
  transition: color var(--transition-fast);
  border-bottom: 1px solid transparent;
}

a:hover {
  color: var(--color-terrain-amber);
  border-bottom-color: var(--color-terrain-amber);
}

/* 代碼與技術文本 */
code, pre {
  font-family: var(--font-mono);
  background-color: rgba(0, 229, 255, 0.05);
  border-left: 3px solid var(--color-satellite-cyan);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: 4px;
  font-size: 0.9rem;
}

pre {
  overflow-x: auto;
  margin: var(--spacing-md) 0;
  padding: var(--spacing-lg);
}

/* ============================================================================
   導航列 - 固定頂部，透明背景，發光邊框
   ============================================================================ */

.navbar {
  background: linear-gradient(180deg, rgba(1, 4, 9, 0.95) 0%, rgba(1, 4, 9, 0.8) 100%);
  border-bottom: 1px solid rgba(0, 229, 255, 0.2);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.1);
  padding: var(--spacing-md) var(--spacing-xl);
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
}

.navbar-brand {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-satellite-cyan);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  text-shadow: 0 0 10px rgba(0, 229, 255, 0.5);
  transition: all var(--transition-normal);
}

.navbar-brand:hover {
  color: var(--color-terrain-amber);
  text-shadow: 0 0 20px rgba(255, 179, 0, 0.5);
}

.navbar-nav {
  display: flex;
  gap: var(--spacing-xl);
  list-style: none;
}

.nav-link {
  color: var(--color-cloud-white);
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-satellite-cyan), var(--color-terrain-amber));
  transition: width var(--transition-normal);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-satellite-cyan);
}

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

/* ============================================================================
   英雄區段 - 全屏，3D 地球效果，衛星掃描線
   ============================================================================ */

.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  background: radial-gradient(ellipse at center, rgba(0, 229, 255, 0.05) 0%, transparent 70%),
              linear-gradient(135deg, var(--color-deep-black) 0%, var(--color-dark-slate) 100%);
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    linear-gradient(0deg, transparent 24%, rgba(0, 229, 255, 0.05) 25%, rgba(0, 229, 255, 0.05) 26%, transparent 27%, transparent 74%, rgba(0, 229, 255, 0.05) 75%, rgba(0, 229, 255, 0.05) 76%, transparent 77%, transparent),
    linear-gradient(90deg, transparent 24%, rgba(0, 229, 255, 0.05) 25%, rgba(0, 229, 255, 0.05) 26%, transparent 27%, transparent 74%, rgba(0, 229, 255, 0.05) 75%, rgba(0, 229, 255, 0.05) 76%, transparent 77%, transparent);
  background-size: 50px 50px;
  opacity: 0.3;
  pointer-events: none;
  animation: gridScroll 20s linear infinite;
}

@keyframes gridScroll {
  0% {
    background-position: 0 0;
  }
  100% {
    background-position: 50px 50px;
  }
}

.hero-content {
  position: relative;
  z-index: 10;
  text-align: center;
  max-width: 900px;
  padding: var(--spacing-3xl) var(--spacing-xl);
}

.hero-title {
  font-size: 4rem;
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: 0.08em;
  margin-bottom: var(--spacing-lg);
  text-transform: uppercase;
  background: linear-gradient(135deg, var(--color-satellite-cyan), var(--color-terrain-amber));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: 0 0 40px rgba(0, 229, 255, 0.3);
  animation: titleGlow 3s ease-in-out infinite;
}

@keyframes titleGlow {
  0%, 100% {
    text-shadow: 0 0 20px rgba(0, 229, 255, 0.2), 0 0 40px rgba(0, 229, 255, 0.1);
  }
  50% {
    text-shadow: 0 0 40px rgba(0, 229, 255, 0.4), 0 0 80px rgba(0, 229, 255, 0.2);
  }
}

.hero-subtitle {
  font-size: 1.5rem;
  font-family: var(--font-body);
  font-weight: 300;
  color: var(--color-cloud-white);
  margin-bottom: var(--spacing-2xl);
  letter-spacing: 0.03em;
}

.hero-tagline {
  font-size: 1.1rem;
  font-family: var(--font-mono);
  color: var(--color-satellite-cyan);
  margin-bottom: var(--spacing-2xl);
  opacity: 0.9;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% {
    opacity: 0.7;
  }
  50% {
    opacity: 1;
  }
}

/* 3D 地球容器 */
.globe-container {
  width: 300px;
  height: 300px;
  margin: 0 auto var(--spacing-2xl);
  position: relative;
  perspective: 1000px;
}

.globe {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, rgba(0, 229, 255, 0.3), transparent),
              radial-gradient(circle at 70% 70%, rgba(255, 179, 0, 0.2), transparent),
              linear-gradient(135deg, var(--color-dark-slate) 0%, var(--color-deep-navy) 100%);
  border: 2px solid var(--color-satellite-cyan);
  box-shadow: 0 0 40px rgba(0, 229, 255, 0.4), inset 0 0 40px rgba(0, 229, 255, 0.1);
  animation: globeRotate 20s linear infinite;
  position: relative;
  overflow: hidden;
}

@keyframes globeRotate {
  0% {
    transform: rotateX(20deg) rotateY(0deg);
  }
  100% {
    transform: rotateX(20deg) rotateY(360deg);
  }
}

.globe::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 40% 40%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
  border-radius: 50%;
  pointer-events: none;
}

/* 衛星軌道 */
.orbit {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border: 1px solid rgba(0, 229, 255, 0.3);
  border-radius: 50%;
  animation: orbitRotate 15s linear infinite;
}

.orbit:nth-child(1) {
  width: 350px;
  height: 350px;
  animation-duration: 15s;
}

.orbit:nth-child(2) {
  width: 450px;
  height: 450px;
  animation-duration: 20s;
  animation-direction: reverse;
}

.orbit:nth-child(3) {
  width: 550px;
  height: 550px;
  animation-duration: 25s;
}

@keyframes orbitRotate {
  0% {
    transform: translate(-50%, -50%) rotateZ(0deg);
  }
  100% {
    transform: translate(-50%, -50%) rotateZ(360deg);
  }
}

.satellite {
  position: absolute;
  width: 8px;
  height: 8px;
  background: var(--color-satellite-cyan);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--color-satellite-cyan);
  top: -4px;
  left: 50%;
}

/* ============================================================================
   按鈕與互動元素
   ============================================================================ */

.btn {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-xl);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 2px solid transparent;
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: rgba(0, 229, 255, 0.2);
  transition: left var(--transition-normal);
  z-index: -1;
}

.btn:hover::before {
  left: 0;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-satellite-cyan), var(--color-terrain-amber));
  color: var(--color-deep-black);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.3);
}

.btn-primary:hover {
  box-shadow: 0 0 40px rgba(0, 229, 255, 0.5), 0 0 60px rgba(255, 179, 0, 0.3);
  transform: translateY(-2px);
}

.btn-secondary {
  background: transparent;
  color: var(--color-satellite-cyan);
  border: 2px solid var(--color-satellite-cyan);
  box-shadow: 0 0 10px rgba(0, 229, 255, 0.2);
}

.btn-secondary:hover {
  background: rgba(0, 229, 255, 0.1);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.4);
  color: var(--color-terrain-amber);
  border-color: var(--color-terrain-amber);
}

.btn-lg {
  padding: var(--spacing-lg) var(--spacing-2xl);
  font-size: 1.1rem;
}

/* ============================================================================
   卡片與內容區塊
   ============================================================================ */

.card {
  background: linear-gradient(135deg, rgba(10, 20, 40, 0.8) 0%, rgba(26, 35, 50, 0.6) 100%);
  border: 1px solid rgba(0, 229, 255, 0.2);
  border-radius: 8px;
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
  transition: all var(--transition-normal);
  box-shadow: 0 4px 12px rgba(0, 229, 255, 0.1);
  backdrop-filter: blur(10px);
}

.card:hover {
  border-color: var(--color-satellite-cyan);
  box-shadow: 0 8px 24px rgba(0, 229, 255, 0.2), 0 0 20px rgba(0, 229, 255, 0.1);
  transform: translateY(-4px);
}

.card-header {
  border-bottom: 2px solid rgba(0, 229, 255, 0.2);
  padding-bottom: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.card-title {
  font-size: 1.5rem;
  font-family: var(--font-display);
  color: var(--color-satellite-cyan);
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.card-body {
  font-size: 0.95rem;
  line-height: 1.8;
}

/* ============================================================================
   區段與容器
   ============================================================================ */

section {
  padding: var(--spacing-3xl) var(--spacing-xl);
  position: relative;
  overflow: hidden;
}

section:nth-child(even) {
  background: linear-gradient(135deg, rgba(1, 4, 9, 0.5) 0%, rgba(26, 35, 50, 0.3) 100%);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 100px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-satellite-cyan), var(--color-terrain-amber));
  margin: var(--spacing-md) auto 0;
  border-radius: 2px;
}

/* ============================================================================
   網格與排版
   ============================================================================ */

.row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.col {
  display: flex;
  flex-direction: column;
}

.col-md-6 {
  grid-column: span 1;
}

@media (min-width: 768px) {
  .col-md-6 {
    grid-column: span 2;
  }
}

/* ============================================================================
   表格樣式
   ============================================================================ */

table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--spacing-xl) 0;
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

thead {
  background: rgba(0, 229, 255, 0.1);
  border-bottom: 2px solid var(--color-satellite-cyan);
}

th {
  padding: var(--spacing-md);
  text-align: left;
  color: var(--color-satellite-cyan);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

td {
  padding: var(--spacing-md);
  border-bottom: 1px solid rgba(0, 229, 255, 0.1);
}

tbody tr:hover {
  background: rgba(0, 229, 255, 0.05);
}

/* ============================================================================
   列表與項目
   ============================================================================ */

.list-item {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-md);
  border-left: 3px solid var(--color-satellite-cyan);
  background: rgba(0, 229, 255, 0.02);
  border-radius: 4px;
  transition: all var(--transition-normal);
}

.list-item:hover {
  background: rgba(0, 229, 255, 0.05);
  border-left-color: var(--color-terrain-amber);
}

.list-item-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  color: var(--color-satellite-cyan);
  font-weight: bold;
}

.list-item-content h4 {
  margin-top: 0;
  margin-bottom: var(--spacing-sm);
  color: var(--color-satellite-cyan);
}

/* ============================================================================
   頁腳
   ============================================================================ */

footer {
  background: linear-gradient(180deg, rgba(1, 4, 9, 0.9) 0%, rgba(1, 4, 9, 1) 100%);
  border-top: 1px solid rgba(0, 229, 255, 0.2);
  padding: var(--spacing-2xl) var(--spacing-xl);
  margin-top: var(--spacing-3xl);
  font-size: 0.9rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-section h5 {
  color: var(--color-satellite-cyan);
  margin-bottom: var(--spacing-md);
  text-transform: uppercase;
  font-size: 0.95rem;
}

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

.footer-section li {
  margin-bottom: var(--spacing-sm);
}

.footer-section a {
  color: var(--color-cloud-white);
  transition: color var(--transition-fast);
}

.footer-section a:hover {
  color: var(--color-satellite-cyan);
}

.footer-bottom {
  border-top: 1px solid rgba(0, 229, 255, 0.2);
  padding-top: var(--spacing-lg);
  text-align: center;
  color: rgba(255, 246, 252, 0.6);
}

/* ============================================================================
   響應式設計
   ============================================================================ */

@media (max-width: 768px) {
  h1 {
    font-size: 2.5rem;
  }
  
  h2 {
    font-size: 1.75rem;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-subtitle {
    font-size: 1.1rem;
  }
  
  .navbar {
    padding: var(--spacing-md);
  }
  
  .navbar-nav {
    gap: var(--spacing-md);
    flex-direction: column;
  }
  
  section {
    padding: var(--spacing-2xl) var(--spacing-md);
  }
  
  .container {
    padding: 0 var(--spacing-md);
  }
  
  .row {
    grid-template-columns: 1fr;
  }
}

/* ============================================================================
   工具類
   ============================================================================ */

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

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }
.mt-5 { margin-top: var(--spacing-2xl); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }
.mb-5 { margin-bottom: var(--spacing-2xl); }

.p-0 { padding: 0; }
.p-1 { padding: var(--spacing-sm); }
.p-2 { padding: var(--spacing-md); }
.p-3 { padding: var(--spacing-lg); }
.p-4 { padding: var(--spacing-xl); }
.p-5 { padding: var(--spacing-2xl); }

.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }

.hidden {
  display: none !important;
}

.visible {
  display: block !important;
}

/* 發光效果 */
.glow {
  text-shadow: 0 0 10px var(--color-satellite-cyan);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.3);
}

.glow-amber {
  text-shadow: 0 0 10px var(--color-terrain-amber);
  box-shadow: 0 0 20px rgba(255, 179, 0, 0.3);
}

/* 動畫延遲 */
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }
.delay-5 { animation-delay: 0.5s; }