/* ============================================
   TEDANCD — Global Styles
   Reverse NCD. Begin at TEDA.
   ============================================ */

/* --- CSS Variables --- */
:root {
  /* Primary Colors — Medical Professional */
  --color-primary: #0A4D68;       /* Deep teal — trust & medical */
  --color-primary-light: #0D7377; /* Lighter teal */
  --color-primary-dark: #063548;  /* Dark teal — headers */
  --color-accent: #E85D04;        /* Warm orange — CTA buttons */
  --color-accent-light: #F48C06;
  --color-accent-dark: #DC2F02;

  /* Neutrals */
  --color-white: #FFFFFF;
  --color-off-white: #F8F9FA;
  --color-light-gray: #E9ECEF;
  --color-gray: #6C757D;
  --color-dark-gray: #343A40;
  --color-black: #212529;

  /* Typography */
  --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-chinese: 'Noto Sans TC', 'Microsoft JhengHei', sans-serif;

  /* Spacing */
  --section-padding: 100px 0;
  --container-max: 1200px;
  --container-padding: 0 16px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
  --shadow-xl: 0 16px 48px rgba(0,0,0,0.15);

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

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

body {
  font-family: var(--font-body);
  color: var(--color-black);
  background-color: var(--color-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Chinese text support */
[lang="zh-Hant"] body,
body.zh {
  font-family: var(--font-chinese), var(--font-body);
}

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

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

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

/* --- Container --- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--container-padding);
}

.container-wide {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--container-padding);
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-primary-dark);
}

h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); }
h3 { font-size: clamp(1.3rem, 2.5vw, 1.8rem); }
h4 { font-size: clamp(1.1rem, 2vw, 1.4rem); }

p {
  margin-bottom: 1rem;
  color: var(--color-dark-gray);
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.section-title {
  margin-bottom: 20px;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--color-gray);
  max-width: 640px;
  margin: 0 auto 48px auto;
}

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

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: all var(--transition-normal);
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-white);
}

.btn-primary:hover {
  background: var(--color-accent-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  border: 2px solid var(--color-white);
  color: var(--color-white);
  background: transparent;
}

.btn-outline:hover {
  background: var(--color-white);
  color: var(--color-primary-dark);
}

.btn-outline-dark {
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
  background: transparent;
}

.btn-outline-dark:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

.btn-lg {
  padding: 18px 42px;
  font-size: 1.05rem;
}

.btn-sm {
  padding: 10px 20px;
  font-size: 0.85rem;
}

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

.section-alt {
  background-color: var(--color-off-white);
}

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

.section-dark h2,
.section-dark h3,
.section-dark h4 {
  color: var(--color-white);
}

.section-dark p {
  color: rgba(255,255,255,0.85);
}

/* Stats section override */
.stats-section {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
  color: var(--color-white);
}

.stats-section .stat-number {
  color: var(--color-accent);
}

.stats-section .stat-label {
  color: rgba(255,255,255,0.85);
}

/* --- Navigation --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: all var(--transition-normal);
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  /* Ensure navbar doesn't create a new stacking context that traps the menu */
  transform: none;
}

.navbar.scrolled {
  padding: 10px 0;
  box-shadow: var(--shadow-sm);
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-primary-dark);
  letter-spacing: -0.5px;
  flex-shrink: 0;
}

.nav-logo span {
  font-weight: 300;
  font-size: 0.75rem;
  color: var(--color-gray);
  letter-spacing: 1px;
  text-transform: uppercase;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-menu a {
  padding: 8px 14px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-dark-gray);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--color-primary);
  background: rgba(10,77,104,0.06);
}

/* Hide mobile-only elements on desktop */
.nav-menu-header,
.nav-overlay {
  display: none;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

/* Language Switcher */
.lang-switch {
  display: flex;
  align-items: center;
  background: var(--color-off-white);
  border-radius: var(--radius-sm);
  overflow: hidden;
  font-size: 0.8rem;
  font-weight: 600;
  flex-shrink: 0;
}

.lang-switch button {
  padding: 6px 12px;
  color: var(--color-gray);
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.lang-switch button.active {
  background: var(--color-primary);
  color: var(--color-white);
}

/* Mobile Menu Toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-dark-gray);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

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

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

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

/* --- Footer --- */
.footer {
  background: var(--color-black);
  color: rgba(255,255,255,0.7);
  padding: 80px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 60px;
}

.footer-brand {
  max-width: 320px;
}

.footer-brand .nav-logo {
  color: var(--color-white);
  margin-bottom: 16px;
}

.footer-brand .nav-logo span {
  color: rgba(255,255,255,0.5);
}

.footer-brand p {
  color: rgba(255,255,255,0.6);
  font-size: 0.9rem;
  line-height: 1.8;
}

.footer-col h4 {
  color: var(--color-white);
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.footer-col a {
  display: block;
  padding: 6px 0;
  font-size: 0.88rem;
  color: rgba(255,255,255,0.6);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 24px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
}

.footer-social {
  display: flex;
  gap: 16px;
}

.footer-social a {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
  color: rgba(255,255,255,0.6);
  font-size: 0.85rem;
  transition: all var(--transition-fast);
}

.footer-social a:hover {
  background: var(--color-accent);
  color: var(--color-white);
}

/* --- Cards --- */
.card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-normal);
}

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

.card-body {
  padding: 32px;
}

.card-img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  background: var(--color-light-gray);
}

/* --- Grid Layouts --- */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

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

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

/* --- Badge --- */
.badge {
  display: inline-block;
  padding: 4px 12px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  border-radius: 20px;
  background: rgba(10,77,104,0.08);
  color: var(--color-primary);
}

.badge-accent {
  background: rgba(232,93,4,0.1);
  color: var(--color-accent);
}

/* --- Stats Section --- */
.stats-section {
  padding: 60px 0;
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
}

.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  padding: 20px 0;
}

.stat-item {
  text-align: center;
  padding: 20px;
}

.stat-number {
  font-size: 3rem;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 12px;
  font-family: var(--font-heading);
}

.stat-label {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.8);
  font-weight: 500;
  letter-spacing: 1px;
}

/* --- Icon Box --- */
.icon-box {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: rgba(10,77,104,0.06);
  color: var(--color-primary);
  font-size: 1.6rem;
  margin-bottom: 20px;
  flex-shrink: 0;
}

.icon-box-accent {
  background: rgba(232,93,4,0.08);
  color: var(--color-accent);
}

.icon-box-white {
  background: rgba(255,255,255,0.15);
  color: var(--color-white);
}

/* --- Form --- */
.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-dark-gray);
  margin-bottom: 6px;
}

.form-control {
  width: 100%;
  padding: 14px 18px;
  font-size: 0.95rem;
  border: 2px solid var(--color-light-gray);
  border-radius: var(--radius-sm);
  background: var(--color-white);
  transition: border-color var(--transition-fast);
  font-family: inherit;
  color: var(--color-black);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-primary);
}

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

select.form-control {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236C757D' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
}

/* --- Breadcrumb --- */
.breadcrumb {
  padding: 100px 0 0;
  font-size: 0.82rem;
}

.breadcrumb ul {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-gray);
}

.breadcrumb a {
  color: var(--color-primary);
}

.breadcrumb a:hover {
  text-decoration: underline;
}

/* --- Page Header (Inner Pages) --- */
.page-header {
  padding: 160px 0 80px;
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  color: var(--color-white);
  text-align: center;
}

.page-header h1 {
  color: var(--color-white);
  margin-bottom: 16px;
}

.page-header p {
  color: rgba(255,255,255,0.8);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* --- Tabs --- */
.tabs {
  display: flex;
  gap: 4px;
  padding: 4px;
  background: var(--color-off-white);
  border-radius: var(--radius-md);
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 10px 24px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-gray);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.tab-btn.active,
.tab-btn:hover {
  background: var(--color-white);
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* --- Accordion (FAQ) --- */
.accordion-item {
  border: 2px solid var(--color-light-gray);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.accordion-item.open {
  border-color: var(--color-primary);
}

.accordion-header {
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-weight: 600;
  color: var(--color-dark-gray);
  transition: color var(--transition-fast);
}

.accordion-item.open .accordion-header {
  color: var(--color-primary);
}

.accordion-icon {
  font-size: 1.2rem;
  transition: transform var(--transition-fast);
}

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

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

.accordion-body-inner {
  padding: 0 24px 20px;
  color: var(--color-gray);
  font-size: 0.92rem;
  line-height: 1.8;
}

/* --- Stripe Payment Section --- */
.payment-section {
  background: linear-gradient(135deg, #635BFF, #7B73FF);
  padding: 60px 0;
  color: var(--color-white);
  text-align: center;
}

.payment-section h2 {
  color: var(--color-white);
}

.stripe-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: rgba(255,255,255,0.15);
  border-radius: 24px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-top: 20px;
}

/* --- Responsive Design --- */

/* Tablet & Mobile — Slide-out Drawer Menu */
@media (max-width: 768px) {
  /* Overlay backdrop - full screen, below menu but above content */
  .nav-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 9998;
    opacity: 0;
    transition: opacity 0.3s ease;
  }

  .nav-overlay.open {
    display: block;
    opacity: 1;
  }

  /* Show mobile-only elements */
  .nav-menu-header {
    display: flex;
  }

  /* Slide-out drawer from right - ABOVE everything including navbar */
  .nav-menu {
    display: flex;
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: auto;
    width: 280px;
    max-width: 80vw;
    background: var(--color-white);
    flex-direction: column;
    justify-content: flex-start;
    align-items: stretch;
    gap: 0;
    z-index: 100000;
    padding: 80px 0 32px;
    transform: translateX(100%);
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: -4px 0 24px rgba(0,0,0,0.15);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  /* WeChat browser fix - prevent external link icons */
  .nav-menu a::after,
  .nav-menu a[target="_blank"]::after {
    display: none !important;
    content: none !important;
  }

  .nav-menu.open {
    transform: translateX(0);
  }

  .nav-menu a {
    font-size: 1rem;
    font-weight: 500;
    padding: 16px 24px;
    color: var(--color-dark-gray);
    border-radius: 0;
    width: 100%;
    text-align: left;
    transition: all var(--transition-fast);
    background: none;
    border-bottom: 1px solid rgba(0,0,0,0.06);
    display: flex;
    align-items: center;
    gap: 12px;
  }

  .nav-menu a::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-accent);
    opacity: 0;
    transition: opacity 0.2s ease;
    flex-shrink: 0;
  }

  .nav-menu a:hover,
  .nav-menu a.active {
    color: var(--color-primary);
    background: rgba(10,77,104,0.04);
    transform: none;
    box-shadow: none;
  }

  .nav-menu a:hover::before,
  .nav-menu a.active::before {
    opacity: 1;
  }

  /* Drawer header with close button area */
  .nav-menu-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
    border-bottom: 1px solid rgba(0,0,0,0.08);
    margin-bottom: 8px;
  }

  .nav-menu-header .nav-logo {
    font-size: 1.2rem;
  }

  .nav-menu-header .nav-logo svg {
    width: 28px;
    height: 28px;
  }

  .nav-toggle {
    display: flex;
    z-index: 99999;
    position: relative;
  }

  .nav-right {
    gap: 6px;
  }

  .nav-right .btn-sm {
    padding: 6px 10px;
    font-size: 0.7rem;
  }

  .lang-switch button {
    padding: 4px 8px;
    font-size: 0.7rem;
  }

  .nav-toggle.active span {
    background: var(--color-primary-dark);
  }

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

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

}

/* Mobile */
@media (max-width: 640px) {
  :root {
    --section-padding: 64px 0;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

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

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

  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }

  .btn-lg {
    padding: 14px 28px;
    font-size: 0.95rem;
  }

  .nav-right .btn-sm {
    display: none;
  }

  .lang-switch {
    transform: scale(0.85);
    transform-origin: right center;
  }

  .nav-logo {
    font-size: 1.15rem;
    gap: 6px;
  }

  .nav-logo svg {
    width: 28px;
    height: 28px;
  }

  .nav-logo span {
    font-size: 0.65rem;
    letter-spacing: 0.5px;
  }

  .navbar .container {
    padding: 0 12px;
  }
}

/* --- Print Styles --- */
@media print {
  .navbar,
  .footer {
    display: none !important;
  }

  body {
    font-size: 12pt;
    color: #000;
  }

  .section {
    padding: 20px 0;
  }
}