/* 
  HK Data Limited - Design System 
  Inspired by CU Coding (cucoding.com)
  High-Tech, Blockchain, Deep-Tech, Data Professional
*/

:root {
  /* Color Palette */
  --bg-primary: #050B14;
  --bg-secondary: #0A1121;
  --bg-dark: #02050A;
  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-inverse: #050B14;
  --accent-cyan: #00F5FF;
  --accent-blue: #3B82F6;
  --accent-hover: #00D1FF;
  --border-color: #1E293B;
  --glass-bg: rgba(10, 17, 33, 0.6);
  --glass-border: rgba(0, 245, 255, 0.15);

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'Roboto Mono', 'Courier New', Courier, monospace;

  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 8rem;

  /* Layout */
  --container-width: 1440px;
  --top-bar-height: 36px;
  --header-height: 136px;

  /* Animation */
  --transition-slow: 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  --transition-fast: 0.2s ease;
}

/* =============================================
   LIGHT THEME OVERRIDE
   ============================================= */
[data-theme="light"] {
  --bg-primary: #F0F4F8;
  --bg-secondary: #FFFFFF;
  --bg-dark: #E2E8F0;
  --text-primary: #1E293B;
  --text-secondary: #475569;
  --text-inverse: #FFFFFF;
  --accent-cyan: #0891B2;
  --accent-blue: #2563EB;
  --accent-hover: #0E7490;
  --border-color: #CBD5E1;
  --glass-bg: rgba(255, 255, 255, 0.75);
  --glass-border: rgba(8, 145, 178, 0.2);
}

/* --- Light-theme specific overrides for hardcoded colors --- */

[data-theme="light"] #particle-canvas {
  opacity: 0.12;
}

[data-theme="light"] .top-bar {
  background-color: rgba(226, 232, 240, 0.95);
}

[data-theme="light"] .navbar {
  background-color: rgba(240, 244, 248, 0.92);
}



[data-theme="light"] .logo-text {
  text-shadow: none;
  color: var(--text-primary);
}

[data-theme="light"] .text-cyan {
  color: var(--accent-cyan);
  text-shadow: none;
}

[data-theme="light"] .hero-title {
  background: linear-gradient(to right, var(--text-primary), var(--text-secondary));
  -webkit-background-clip: text;
  background-clip: text;
}

[data-theme="light"] .btn-primary {
  box-shadow: 0 4px 15px rgba(8, 145, 178, 0.25);
}

[data-theme="light"] .btn-primary:hover {
  box-shadow: 0 8px 25px rgba(8, 145, 178, 0.35);
}

[data-theme="light"] .btn-outline {
  border-color: var(--accent-cyan);
  box-shadow: none;
}

[data-theme="light"] .btn-outline:hover {
  background-color: rgba(8, 145, 178, 0.08);
  box-shadow: 0 0 12px rgba(8, 145, 178, 0.15) inset;
}

[data-theme="light"] .feature-item {
  background: var(--bg-secondary);
  border-color: var(--border-color);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

[data-theme="light"] .feature-item:hover {
  box-shadow: 0 4px 16px rgba(8, 145, 178, 0.12);
  border-color: var(--accent-cyan);
}

[data-theme="light"] .block-link {
  opacity: 0.15;
}

[data-theme="light"] .central-node {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 20px rgba(8, 145, 178, 0.15);
  background: radial-gradient(circle, rgba(8, 145, 178, 0.08) 0%, transparent 70%);
}

[data-theme="light"] .central-node::before {
  border-color: var(--accent-blue);
}

[data-theme="light"] .orbiting-node {
  background-color: var(--accent-cyan);
  box-shadow: 0 0 10px var(--accent-cyan);
}

[data-theme="light"] .about-card {
  background: var(--glass-bg);
  border-color: var(--glass-border);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
}

[data-theme="light"] .about-card::after {
  background: linear-gradient(to bottom, transparent, var(--accent-cyan), transparent);
}

[data-theme="light"] .about-card h3 {
  background: rgba(8, 145, 178, 0.08);
}

[data-theme="light"] .diagram-container::before {
  background: linear-gradient(to bottom, var(--accent-cyan), var(--accent-blue), var(--accent-cyan));
  opacity: 0.2;
}

[data-theme="light"] .diagram-item {
  background: var(--bg-secondary);
  border-color: var(--border-color);
}

[data-theme="light"] .diagram-item:hover {
  border-color: var(--accent-cyan);
}

[data-theme="light"] .diagram-icon {
  background: var(--bg-primary);
  border-color: var(--accent-cyan);
  box-shadow: 0 0 10px rgba(8, 145, 178, 0.12);
}

[data-theme="light"] .team-member {
  background: var(--bg-secondary);
  border-color: var(--border-color);
}

[data-theme="light"] .team-member:hover {
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .team-member-featured {
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-primary));
  border-color: rgba(8, 145, 178, 0.2);
}

[data-theme="light"] .member-photo-img {
  border-color: var(--glass-border);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .photo-placeholder {
  background: var(--bg-primary);
  border-color: var(--border-color);
}

[data-theme="light"] .photo-placeholder::before {
  color: var(--border-color);
}

[data-theme="light"] .photo-placeholder::after {
  box-shadow: inset 0 0 50px rgba(8, 145, 178, 0.05);
}

[data-theme="light"] .bio-block {
  border-bottom-color: rgba(8, 145, 178, 0.08);
}

[data-theme="light"] .news-list li {
  border-bottom-color: var(--border-color);
}

[data-theme="light"] .news-list li:hover {
  background: linear-gradient(90deg, rgba(8, 145, 178, 0.04) 0%, transparent 100%);
}

[data-theme="light"] .partner-card {
  background-color: var(--bg-secondary);
  border-color: var(--border-color);
}

[data-theme="light"] .partner-card:hover {
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
  border-color: var(--accent-cyan);
}

[data-theme="light"] .partner-card::before {
  background: linear-gradient(45deg, transparent, rgba(0, 0, 0, 0.02), transparent);
}

[data-theme="light"] .partners-img {
  filter: none;
  opacity: 0.7;
}

[data-theme="light"] .partner-card:hover .partners-img {
  opacity: 1;
}

[data-theme="light"] .lang-btn {
  background: var(--bg-primary);
  border-color: var(--border-color);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.06);
}

[data-theme="light"] .lang-btn:hover {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  box-shadow: 0 4px 12px rgba(8, 145, 178, 0.12);
}

[data-theme="light"] .lang-btn.active {
  background: rgba(8, 145, 178, 0.08);
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  box-shadow: 0 4px 16px rgba(8, 145, 178, 0.15);
}

[data-theme="light"] .footer {
  background-color: var(--bg-dark);
}

[data-theme="light"] .footer::before {
  background: linear-gradient(90deg, transparent, var(--accent-cyan), transparent);
  opacity: 0.3;
}

[data-theme="light"] .footer-bottom {
  border-top-color: var(--border-color);
}

[data-theme="light"] .form-group input,
[data-theme="light"] .form-group textarea {
  background: var(--bg-primary);
  border-color: var(--border-color);
}

[data-theme="light"] .form-group input:focus,
[data-theme="light"] .form-group textarea:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 2px rgba(8, 145, 178, 0.12);
}

[data-theme="light"] .appointment-form {
  background: var(--bg-secondary);
  border-color: var(--border-color);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

[data-theme="light"] .nav-links > a::after {
  background: var(--accent-cyan);
  box-shadow: 0 0 6px var(--accent-cyan);
}

/* === End Light Theme Overrides === */


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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1,
h2,
h3,
h4 {
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.font-mono {
  font-family: var(--font-mono);
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-fast);
}

/* Background Particles Canvas */
#particle-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
  opacity: 0.6;
}

/* Typography Classes */
.text-large {
  font-size: 1.25rem;
  line-height: 1.6;
}

.text-small {
  font-size: 0.875rem;
}

.text-muted {
  color: var(--text-secondary);
}

.text-cyan {
  color: var(--accent-cyan);
  text-shadow: 0 0 10px rgba(0, 245, 255, 0.4);
}

/* Layout Containers */
.section {
  padding: var(--spacing-xl) 0;
  position: relative;
  z-index: 1;
}

.section-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.bg-light {
  background-color: var(--bg-secondary);
}

/* Buttons */
.btn-primary {
  display: inline-block;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
  color: var(--text-inverse);
  padding: 0.75rem 1.5rem;
  border-radius: 4px;
  font-size: 0.95rem;
  font-weight: 600;
  border: none;
  box-shadow: 0 0 15px rgba(0, 245, 255, 0.3);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  cursor: pointer;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 25px rgba(0, 245, 255, 0.6);
  color: var(--text-inverse);
}

.btn-outline {
  display: inline-block;
  background-color: transparent;
  color: var(--accent-cyan);
  padding: 0.75rem 1.5rem;
  border-radius: 4px;
  font-size: 0.95rem;
  font-weight: 500;
  border: 1px solid var(--accent-cyan);
  box-shadow: 0 0 10px rgba(0, 245, 255, 0.1) inset;
  transition: all var(--transition-fast);
}

.btn-outline:hover {
  background-color: rgba(0, 245, 255, 0.1);
  box-shadow: 0 0 15px rgba(0, 245, 255, 0.3) inset, 0 0 15px rgba(0, 245, 255, 0.3);
}

.btn-outline,
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-with-icon span {
  font-size: 1.1em;
  transition: transform var(--transition-fast);
}

.btn-with-icon:hover span {
  transform: translate(2px, -2px);
}

.btn-text {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 500;
  color: var(--text-primary);
}

.btn-text span {
  color: var(--accent-cyan);
  transition: transform var(--transition-fast);
}

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

/* === Top Info Bar === */
.top-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--top-bar-height);
  background-color: rgba(2, 5, 10, 0.95);
  border-bottom: 1px solid rgba(0, 245, 255, 0.08);
  z-index: 101;
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.top-bar-container {
  max-width: var(--container-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.top-bar-left {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.top-bar-item {
  white-space: nowrap;
  letter-spacing: 0.02em;
}

.top-bar-divider {
  color: var(--border-color);
  margin: 0 0.5rem;
  opacity: 0.5;
}

.top-bar-right {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.top-bar-right a {
  color: var(--text-secondary);
  font-size: 0.78rem;
  white-space: nowrap;
  transition: color var(--transition-fast);
  letter-spacing: 0.02em;
}

.top-bar-right a:hover {
  color: var(--accent-cyan);
}

/* === Navigation === */
.navbar {
  position: fixed;
  top: 0;
  /*top: var(--top-bar-height);*/
  left: 0;
  width: 100%;
  height: 150px;
  background-color: rgba(5, 11, 20, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 100;
  border-bottom: 1px solid var(--glass-border);
  transition: transform 0.3s ease;
}

.nav-container {
  max-width: var(--container-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  line-height: 1;
  flex-shrink: 0;
  margin-right: 4rem;
  position: relative;
  height: 100%;
}

.logo::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 120%;
  height: 120%;
  z-index: -1;
  border-radius: 50%;
}

.logo-img {
  height: 120px;
  width: auto;
  margin: -10px 0;
}

.logo-text-group {
  display: flex;
  flex-direction: column;
}

.logo-text {
  font-family: var(--font-sans);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  white-space: nowrap;
  text-shadow: 0 0 10px rgba(255, 255, 255, 0.2);
}

.logo-text-ch {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent-cyan);
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  flex: 1;
}

.nav-links>a {
  font-size: 0.95rem;
  color: var(--text-primary);
  white-space: nowrap;
  position: relative;
}

.nav-links>a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--accent-cyan);
  transition: width var(--transition-fast);
  box-shadow: 0 0 8px var(--accent-cyan);
}

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

/* Language Switcher */
.lang-switcher {
  display: flex;
  gap: 0.5rem;
  margin-left: 2rem;
  padding-left: 2rem;
  border-left: 1px solid var(--border-color);
}

.lang-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--glass-border);
  color: var(--text-secondary);
  padding: 0.5rem 1rem;
  border-radius: 4px;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.lang-btn:hover {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  box-shadow: 0 0 15px rgba(0, 245, 255, 0.3);
  transform: translateY(-2px);
}

.lang-btn.active {
  background: linear-gradient(135deg, rgba(0, 245, 255, 0.1), rgba(59, 130, 246, 0.1));
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  box-shadow: 0 0 20px rgba(0, 245, 255, 0.4);
  transform: translateY(-2px);
}

/* === Theme Toggle Button (NEW) === */
.theme-toggle {
  display: flex;
  align-items: center;
  margin-left: 1rem;
  padding-left: 1rem;
  border-left: 1px solid var(--border-color);
}

.theme-toggle-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--glass-border);
  color: var(--text-secondary);
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  position: relative;
}

.theme-toggle-btn:hover {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  box-shadow: 0 0 15px rgba(0, 245, 255, 0.3);
  transform: translateY(-2px);
}

.theme-toggle-btn svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  position: absolute;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

/* Dark theme (default): show sun icon */
.theme-toggle-btn .icon-sun {
  opacity: 1;
  transform: rotate(0deg);
}

.theme-toggle-btn .icon-moon {
  opacity: 0;
  transform: rotate(-90deg);
}

/* Light theme: show moon icon */
[data-theme="light"] .theme-toggle-btn .icon-sun {
  opacity: 0;
  transform: rotate(90deg);
}

[data-theme="light"] .theme-toggle-btn .icon-moon {
  opacity: 1;
  transform: rotate(0deg);
}

[data-theme="light"] .theme-toggle-btn {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .theme-toggle-btn:hover {
  box-shadow: 0 4px 16px rgba(8, 145, 178, 0.15);
}

/* === End Theme Toggle === */

.external-links {
  display: flex;
  gap: 1rem;
  margin-left: auto;
  padding-left: 2rem;
  border-left: 1px solid var(--border-color);
}

.external-links a {
  white-space: nowrap;
  font-size: 0.85rem;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
}

/* === Hero Section === */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--header-height);
  max-width: var(--container-width);
  margin: 0 auto;
  padding-left: var(--spacing-md);
  padding-right: var(--spacing-md);
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.75); /* light theme */
  z-index: 0;
}

.hero-content {
  flex: 1;
  position: relative;
  z-index: 2;
}


.hero-title {
  font-size: clamp(1.8rem, 4vw, 3.5rem);
  line-height: 1.1;
  margin-bottom: var(--spacing-md);
  background: linear-gradient(to right, var(--text-primary), var(--text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

@media (min-width: 769px) {
  .hero-title {
    white-space: nowrap;
  }
}

.hero-subtitle {
  font-size: clamp(1rem, 1.5vw, 1.25rem);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
  max-width: 550px;
  border-left: 3px solid var(--accent-cyan);
  padding-left: 1rem;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.hero-cta {
  display: flex;
  align-items: center;
  gap: 2rem;
  margin-bottom: var(--spacing-lg);
}

/* Hero Features */
.hero-features {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-top: var(--spacing-lg);
}

.feature-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-secondary);
  padding: 0.75rem 1.25rem;
  border-radius: 25px;
  border: 1px solid var(--glass-border);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.feature-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 245, 255, 0.15);
  border-color: var(--accent-cyan);
}

.feature-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  color: var(--accent-cyan);
}

.feature-icon svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  fill: none;
}

/* Top bar icons */
.top-bar-item svg {
  width: 14px;
  height: 14px;
  stroke: currentColor;
  fill: none;
  margin-right: 6px;
  vertical-align: middle;
}

/* Blockchain Links */
.blockchain-links {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.block-link {
  position: absolute;
  width: 2px;
  height: 100px;
  background: linear-gradient(to bottom, var(--accent-cyan), transparent);
  animation: pulse 2s infinite;
}

.block-link:nth-child(1) {
  top: 20%;
  left: 30%;
  transform: rotate(45deg);
  animation-delay: 0s;
}

.block-link:nth-child(2) {
  top: 50%;
  right: 25%;
  transform: rotate(-30deg);
  animation-delay: 0.5s;
}

.block-link:nth-child(3) {
  bottom: 20%;
  left: 25%;
  transform: rotate(15deg);
  animation-delay: 1s;
}

@keyframes pulse {
  0%, 100% {
    opacity: 0.3;
  }
  50% {
    opacity: 1;
    box-shadow: 0 0 10px var(--accent-cyan);
  }
}

.hero-visual {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  z-index: 1;
}

/* Data Node Visual Component */
.data-node-wrapper {
  position: relative;
  width: 500px;
  height: 500px;
}

.central-node {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 120px;
  height: 120px;
  background: radial-gradient(circle, rgba(0, 245, 255, 0.2) 0%, rgba(0, 245, 255, 0) 70%);
  border: 2px solid var(--accent-cyan);
  border-radius: 10px;
  transform-style: preserve-3d;
  animation: rotateNode 10s linear infinite;
  box-shadow: 0 0 30px rgba(0, 245, 255, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
}

.central-node::before {
  content: '';
  position: absolute;
  width: 160px;
  height: 160px;
  border: 1px dashed var(--accent-blue);
  border-radius: 50%;
  animation: spin 15s linear infinite reverse;
}

.orbiting-node {
  position: absolute;
  width: 20px;
  height: 20px;
  background-color: var(--accent-cyan);
  border-radius: 50%;
  box-shadow: 0 0 15px var(--accent-cyan);
  top: 50%;
  left: 50%;
}

.orbit-1 {
  animation: orbit1 8s linear infinite;
}

.orbit-2 {
  animation: orbit2 12s linear infinite;
}

.orbit-3 {
  animation: orbit3 15s linear infinite;
}

@keyframes rotateNode {
  0% {
    transform: translate(-50%, -50%) rotateX(0deg) rotateY(0deg);
  }

  100% {
    transform: translate(-50%, -50%) rotateX(360deg) rotateY(360deg);
  }
}

@keyframes spin {
  100% {
    transform: rotate(360deg);
  }
}

@keyframes orbit1 {
  0% {
    transform: rotate(0deg) translateX(150px) rotate(0deg);
  }

  100% {
    transform: rotate(360deg) translateX(150px) rotate(-360deg);
  }
}

@keyframes orbit2 {
  0% {
    transform: rotate(120deg) translateX(220px) rotate(-120deg);
  }

  100% {
    transform: rotate(480deg) translateX(220px) rotate(-480deg);
  }
}

@keyframes orbit3 {
  0% {
    transform: rotate(240deg) translateX(180px) rotate(-240deg);
  }

  100% {
    transform: rotate(600deg) translateX(180px) rotate(-600deg);
  }
}


/* === Sections Shared === */
.section-header {
  margin-bottom: var(--spacing-lg);
  max-width: 800px;
  position: relative;
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: var(--spacing-sm);
  display: flex;
  align-items: center;
  gap: 1rem;
}

.section-title::before {
  content: '//';
  color: var(--accent-cyan);
  font-family: var(--font-mono);
}

.section-lead {
  font-size: 1.25rem;
  color: var(--text-secondary);
}

/* === About Grid & Glass Cards === */
.about-grid {
  margin-top: var(--spacing-md);
}

.about-card {
  font-size: 1.25rem;
  line-height: 1.8;
  max-width: 800px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px);
  padding: 2.5rem;
  border-radius: 12px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
  margin-bottom: var(--spacing-xl);
  position: relative;
  overflow: hidden;
}

.about-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 2px;
  height: 100%;
  background: linear-gradient(to bottom, transparent, var(--accent-cyan), transparent);
}

.about-card h3 {
  font-size: 0.9rem;
  font-family: var(--font-mono);
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--spacing-md);
  display: inline-block;
  padding: 0.2rem 0.5rem;
  background: rgba(0, 245, 255, 0.1);
  border-radius: 4px;
}

/* Diagram System */
.diagram-container {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  position: relative;
}

.diagram-container::before {
  content: '';
  position: absolute;
  left: 24px;
  top: 20px;
  bottom: 20px;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent-cyan), var(--accent-blue), var(--accent-cyan));
  opacity: 0.3;
  z-index: 0;
}

.diagram-item {
  position: relative;
  z-index: 1;
  display: flex;
  gap: 2rem;
  background: var(--bg-secondary);
  border: 1px solid var(--glass-border);
  padding: 2rem;
  border-radius: 8px;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.diagram-item:hover {
  transform: translateX(10px);
  border-color: var(--accent-cyan);
}

.diagram-icon {
  width: 50px;
  height: 50px;
  background: var(--bg-primary);
  border: 2px solid var(--accent-cyan);
  box-shadow: 0 0 15px rgba(0, 245, 255, 0.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent-cyan);
  flex-shrink: 0;
}

.diagram-content h4 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.diagram-content p {
  color: var(--text-secondary);
}

/* === Leadership Section === */
.leadership-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
  gap: 3rem;
  margin-top: var(--spacing-lg);
}

.team-member {
  display: flex;
  gap: 2rem;
  background: var(--bg-primary);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 2rem;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.team-member:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 40px rgba(0, 245, 255, 0.1);
}

.member-photo {
  flex-shrink: 0;
  width: 150px;
}

.photo-placeholder {
  width: 100%;
  aspect-ratio: 1/1;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  position: relative;
  overflow: hidden;
}

.photo-placeholder::before {
  content: '<IMAGE DATA>';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-family: var(--font-mono);
  color: var(--border-color);
}

.photo-placeholder::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  box-shadow: inset 0 0 50px rgba(0, 245, 255, 0.1);
  border-radius: 8px;
}

.member-info {
  flex: 1;
}

.member-info .name {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.member-info .roles {
  color: var(--accent-cyan);
  margin-bottom: var(--spacing-md);
  font-size: 0.9rem;
  font-family: var(--font-mono);
  line-height: 1.8;
}

.member-info .bio {
  margin-bottom: var(--spacing-sm);
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Featured Team Member */
.team-member-featured {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 3rem;
  padding: 3rem;
  border-color: rgba(0, 245, 255, 0.25);
  background: linear-gradient(135deg, var(--bg-primary), var(--bg-secondary));
}

.team-member-featured .member-photo {
  width: 100%;
}

.member-photo-img {
  width: 100%;
  border-radius: 10px;
  border: 2px solid var(--glass-border);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  object-fit: cover;
  aspect-ratio: 3 / 4;
}

.photo-note {
  font-size: 0.7rem;
  color: var(--text-secondary);
  opacity: 0.6;
  margin-top: 0.75rem;
  text-align: center;
}

.bio-block {
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid rgba(0, 245, 255, 0.08);
}

.bio-block:last-child {
  border-bottom: none;
  padding-bottom: 0;
  margin-bottom: 0;
}

/* === News & Partners === */
.section-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6rem;
}

.news-section {
  background: var(--bg-secondary);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 2.5rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.news-section .section-header {
  margin-bottom: var(--spacing-md);
}

.news_section {
  background: var(--bg-secondary);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.news_section .section-container {
  padding: 2.5rem;
}

.news-list {
  list-style: none;
  margin-top: var(--spacing-md);
}

.news-list li {
  border-bottom: 1px solid var(--border-color);
  padding: 1.5rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  position: relative;
}

.news-list li:hover {
  background: linear-gradient(90deg, rgba(0, 245, 255, 0.05) 0%, transparent 100%);
}

.news-date {
  font-size: 0.8rem;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  text-transform: uppercase;
}

.news-list a {
  font-size: 1.15rem;
  font-weight: 500;
  display: flex;
  flex-direction: column;
  line-height: 1.4;
  gap: 0.25rem;
}

.news-list a span[lang="en"] {
  font-size: 1.15rem;
}

.news-list a span[lang="zh-tw"],
.news-list a span[lang="zh-cn"] {
  font-size: 1.05rem;
  margin-top: 0.125rem;
}

.news-list a:hover {
  color: var(--accent-cyan);
}

.partners-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-top: var(--spacing-md);
}

.partner-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.partner-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 30px rgba(0, 245, 255, 0.1);
  border-color: var(--accent-cyan);
}

.partner-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.03), transparent);
  transform: translateX(-100%);
  transition: transform 0.6s;
}

.partner-card:hover::before {
  transform: translateX(100%);
}

.partner-logo {
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 80px;
  height: 80px;
}

.partners-img {
  max-width: 100%;
  height: auto;
  opacity: 0.6;
  filter: brightness(0) invert(1);
  transition: opacity var(--transition-fast);
}

.partner-card:hover .partners-img {
  opacity: 1;
}

.partner-info {
  text-align: center;
  width: 100%;
}

.partner-info h4 {
  font-size: 1rem;
  margin-bottom: 0.25rem;
  color: var(--text-primary);
}

.partner-info p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin: 0;
}

/* === Footer === */
.footer {
  background-color: var(--bg-dark);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-xl) 0 var(--spacing-md);
  position: relative;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-cyan), transparent);
  opacity: 0.5;
}

.footer-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.2fr 1.8fr;
  gap: 4rem;
  margin-bottom: var(--spacing-xl);
}

.footer-brand h2 {
  font-size: 1.5rem;
  color: var(--text-primary);
  margin-bottom: 2rem;
}

.footer-address {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.8;
}

.footer-address p {
  margin-bottom: 1.5rem;
}

.footer-address strong {
  color: var(--accent-cyan);
  font-weight: 500;
  font-family: var(--font-mono);
}

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

.link-col h4 {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--accent-cyan);
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.link-col a {
  display: block;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

.link-col a:hover {
  color: var(--text-primary);
}

.footer-ext-link {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.footer-ext-link span {
  font-size: 1em;
  transition: transform var(--transition-fast);
  color: var(--accent-cyan);
}

.footer-ext-link:hover span {
  transform: translate(2px, -2px);
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.legal-links {
  display: flex;
  gap: 2rem;
}

.legal-links a:hover {
  color: var(--text-primary);
}

/* Language-specific content */
.lang-en, .lang-zh-tw, .lang-zh-cn {
  display: none;
}

.lang-en {
  display: block;
}

.lang-zh-tw, .lang-zh-cn {
  line-height: 1.7;
  letter-spacing: 0.02em;
}

.bio-block {
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid rgba(0, 245, 255, 0.08);
}

.bio-block:last-child {
  border-bottom: none;
  padding-bottom: 0;
  margin-bottom: 0;
}

.bio {
  margin-bottom: 1rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.bio:last-child {
  margin-bottom: 0;
}

/* Appointment Form Styles */
.appointment-form {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem;
  background: var(--bg-primary);
  border-radius: 8px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  border: 1px solid var(--glass-border);
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

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

.form-group.full-width {
  grid-column: 1 / -1;
}

.form-group label {
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text-primary);
}

.form-group input,
.form-group textarea {
  padding: 0.75rem 1rem;
  border: 1px solid var(--glass-border);
  border-radius: 4px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 1rem;
  transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 2px rgba(0, 245, 255, 0.1);
}

.form-actions {
  display: flex;
  justify-content: flex-end;
}

/* === Animations === */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.delay-1 {
  transition-delay: 0.2s;
}

.delay-2 {
  transition-delay: 0.4s;
}

/* =============================================
   RESPONSIVE DESIGN
   ============================================= */

/* --- Tablet (≤ 1024px) --- */
@media (max-width: 1024px) {
  .hero-title {
    font-size: clamp(1.8rem, 5vw, 3rem);
  }

  .section-split,
  .leadership-content {
    grid-template-columns: 1fr;
    gap: 4rem;
  }
}

/* --- Mobile (≤ 768px) --- */
@media (max-width: 768px) {

  /* Nav */
  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--bg-primary);
    padding: var(--spacing-md);
    border-top: 1px solid var(--glass-border);
  }

  .lang-switcher {
    margin-left: 0;
    padding-left: 0;
    border-left: none;
    margin-top: var(--spacing-sm);
    justify-content: center;
  }

  /* Theme toggle in mobile menu */
  .theme-toggle {
    margin-left: 0;
    padding-left: 0;
    border-left: none;
    margin-top: var(--spacing-sm);
    justify-content: center;
  }

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

  .top-bar {
    display: none;
  }

  .navbar {
    top: 0;
  }

  .menu-toggle {
    display: block;
    width: 24px;
    height: 20px;
    position: relative;
  }

  .menu-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--text-primary);
    position: absolute;
    transition: 0.3s;
  }

  .menu-toggle span:first-child {
    top: 0;
  }

  .menu-toggle span:nth-child(2) {
    top: 50%;
    transform: translateY(-50%);
  }

  .menu-toggle span:last-child {
    bottom: 0;
  }

  .menu-toggle.active span:first-child {
    top: 50%;
    transform: translateY(-50%) rotate(45deg);
  }

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

  .menu-toggle.active span:last-child {
    bottom: 50%;
    transform: translateY(50%) rotate(-45deg);
  }

  /* Hero */
  .hero {
    flex-direction: column;
    text-align: center;
    justify-content: center;
    padding-top: calc(100px + 2rem);
    padding-left: var(--spacing-sm);
    padding-right: var(--spacing-sm);
  }

  .hero-title {
    font-size: clamp(1.6rem, 7vw, 2.4rem);
    white-space: normal;
    word-wrap: break-word;
    overflow-wrap: break-word;
    line-height: 1.2;
  }

  .hero-subtitle {
    margin: 0 auto 2rem auto;
    border-left: none;
    border-bottom: 2px solid var(--accent-cyan);
    padding-left: 0;
    padding-bottom: 1rem;
    max-width: 100%;
    font-size: clamp(0.9rem, 3.5vw, 1.1rem);
  }

  .hero-cta {
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
  }

  .hero-visual {
    margin-top: 4rem;
    display: none;
  }

  .hero-features {
    justify-content: center;
    gap: 0.75rem;
  }

  .feature-item {
    flex: 0 1 auto;
    max-width: 200px;
    font-size: 0.85rem;
    padding: 0.6rem 1rem;
  }

  /* Diagram */
  .diagram-container {
    gap: 1.5rem;
  }

  .diagram-item {
    flex-direction: column;
    padding: 1.5rem;
    gap: 1rem;
  }

  .diagram-container::before {
    left: 25px;
  }

  .diagram-icon {
    align-self: flex-start;
  }

  .diagram-content h4 {
    font-size: 1.1rem;
  }

  .diagram-content p {
    font-size: 1rem;
  }

  /* About */
  .about-card {
    padding: 1.5rem;
    font-size: 1rem;
  }

  /* Section */
  .section {
    padding: var(--spacing-lg) 0;
  }

  .section-container {
    padding: 0 var(--spacing-sm);
  }

  .section-title {
    font-size: clamp(1.5rem, 5vw, 2rem);
    flex-wrap: wrap;
  }

  /* Leadership */
  .leadership-grid {
    grid-template-columns: 1fr;
  }

  .team-member {
    flex-direction: column;
    text-align: center;
  }

  .member-photo {
    width: 120px;
    margin: 0 auto;
  }

  .team-member-featured {
    grid-template-columns: 1fr;
    padding: 1.5rem;
    text-align: left;
  }

  .team-member-featured .member-photo {
    max-width: 200px;
    margin: 0 auto;
  }

  /* News & Partners */
  .section-split {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .partners-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  /* Footer */
  .footer-top {
    grid-template-columns: 1fr;
  }

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

  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    align-items: flex-start;
  }

  /* External links in mobile nav */
  .external-links {
    margin-left: 0;
    padding-left: 0;
    border-left: none;
    flex-direction: column;
    align-items: center;
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--border-color);
  }

  /* Form */
  .form-grid {
    grid-template-columns: 1fr;
  }
}

/* --- Small mobile (≤ 480px) --- */
@media (max-width: 480px) {
  .hero {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .hero-title {
    font-size: clamp(1.4rem, 6.5vw, 1.8rem);
  }

  .hero-subtitle {
    font-size: 0.9rem;
  }

  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

  .feature-item {
    max-width: 100%;
    flex: 1 1 calc(50% - 0.5rem);
    justify-content: center;
    font-size: 0.8rem;
  }

  .diagram-item {
    padding: 1.25rem;
  }

  .diagram-content h4 {
    font-size: 1rem;
  }

  .diagram-content p {
    font-size: 0.9rem;
  }

  .about-card {
    padding: 1.25rem;
    font-size: 0.95rem;
  }

  .section-container {
    padding: 0 1rem;
  }

  .logo-img {
    height: 70px;
  }

  .logo {
    margin-right: 1rem;
  }

  
}

/* === News Page Styles === */

.news-hero-image {
    margin: 2rem 0;
}

.news-hero-image img {
    width: 100%;
    border-radius: 8px;
}

.news-content {
    max-width: 900px;
    margin: 0 auto;
    line-height: 1.8;
    font-size: 1rem;
}

.news-content p {
    margin-bottom: 1.2em;
}

.news-content .article-title {
    text-align: center;
    font-weight: 700;
    font-size: 1.4rem;
    line-height: 1.5;
    margin-bottom: 1.5rem;
}

.news-content .article-subtitle {
    font-weight: 700;
    margin-top: 1.5em;
    margin-bottom: 0.5em;
}

.news-figure {
    margin: 2rem 0;
    text-align: center;
}

.news-figure img {
    width: 100%;
    max-width: 800px;
    border-radius: 8px;
    display: block;
    margin: 0 auto;
}

.news-figure figcaption {
    margin-top: 0.75rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    text-align: center;
    padding: 0 1rem;
}

.news-content h3 {
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.news-content hr {
    margin: 3rem 0;
    border: none;
    border-top: 1px solid var(--border-color);
}

.news-gallery {
    margin-top: 3rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
}

.news-gallery img {
    width: 100%;
    border-radius: 6px;
}

.news-back {
    margin-top: 3rem;
    text-align: left;
}

.news-back a {
    text-decoration: none;
    color: var(--accent-color);
    font-weight: 500;
}

  .news_section {
    margin-top: 2rem;
  }

/* ===== Mobile Navbar Fix ===== */
@media (max-width: 768px) {
    .navbar {
        padding: 8px 16px;
        height: 100px;
    }

    .logo-img {
        height: 90px;
        width: auto;
    }

    .hamburger {
        width: 28px;
        height: 28px;
    }

    .hamburger span {
        height: 2px;
    }

    .theme-toggle {
        width: 32px;
        height: 32px;
    }

    .theme-toggle svg {
        width: 16px;
        height: 16px;
    }

    .news_section {
      top:30px;
    }
}

@media (max-width: 480px) {
    .navbar {
        padding: 6px 12px;
        height: 100px;
    }

    

    .logo-img {
        height: 70px;
        width: auto;
    }

    .hamburger {
        width: 24px;
        height: 24px;
    }

    .theme-toggle {
        width: 28px;
        height: 28px;
    }

    .theme-toggle svg {
        width: 14px;
        height: 14px;
    }

    .news_section {
      top:30px;
    }

}