/* ============================================
   SKIN CANCER LASER CENTRE — Design System
   Version: 1.0.0
   ============================================ */

/* --- Design Tokens --- */
:root {
  /* Brand Colors */
  --color-black: #000000;
  --color-white: #FFFFFF;
  --color-dark: #333333;
  --color-gold: #c79323;
  --color-gold-light: #e0b85c;
  --color-light: #f5f5f5;
  --color-gray: #888888;
  --color-border: #e0e0e0;
  --color-overlay: rgba(0,0,0,0.6);

  /* Typography */
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-heading: 'Judson', Georgia, serif;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 5rem;
  --space-3xl: 8rem;

  /* Layout */
  --max-width: 1200px;
  --nav-height: 80px;

  /* Transitions */
  --transition: 0.3s ease;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.12);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.16);
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-body);
  color: var(--color-dark);
  background: var(--color-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }

/* --- Bilingual System --- */
/* Default: English (no body class needed) */
[data-zh] { display: none; }

/* Chinese mode */
body.lang-zh [data-en] { display: none; }
body.lang-zh [data-zh] { display: revert; }

/* Fix for inline elements */
body.lang-zh span[data-zh] { display: inline; }
body.lang-zh a[data-zh] { display: inline; }
body.lang-zh li[data-zh] { display: list-item; }
body.lang-zh h1[data-zh],
body.lang-zh h2[data-zh],
body.lang-zh h3[data-zh],
body.lang-zh h4[data-zh],
body.lang-zh p[data-zh] { display: block; }
body.lang-zh button[data-zh] { display: inline-flex; }
body.lang-zh label[data-zh] { display: inline; }
body.lang-zh option[data-zh] { display: block; }
body.lang-zh td[data-zh],
body.lang-zh th[data-zh] { display: table-cell; }

/* English mode explicit (for elements that might be hidden) */
body.lang-en [data-en] { display: revert; }
body.lang-en [data-zh] { display: none; }
body.lang-en span[data-en] { display: inline; }
body.lang-en a[data-en] { display: inline; }
body.lang-en li[data-en] { display: list-item; }
body.lang-en h1[data-en],
body.lang-en h2[data-en],
body.lang-en h3[data-en],
body.lang-en h4[data-en],
body.lang-en p[data-en] { display: block; }
body.lang-en button[data-en] { display: inline-flex; }

/* --- Language Toggle --- */
.lang-toggle {
  display: flex;
  align-items: center;
  gap: 0;
  background: transparent;
  border: 1.5px solid var(--color-gold);
  border-radius: 20px;
  overflow: hidden;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.03em;
}
.lang-toggle button {
  padding: 6px 14px;
  border: none;
  background: transparent;
  color: var(--color-dark);
  cursor: pointer;
  font-size: inherit;
  font-weight: inherit;
  transition: all var(--transition);
}
.lang-toggle button.active {
  background: var(--color-gold);
  color: var(--color-white);
}
.lang-toggle button:hover:not(.active) {
  background: var(--color-light);
}

/* --- Typography --- */
h1, h2, h3, h4 { font-family: var(--font-heading); font-weight: 700; line-height: 1.2; }
h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.5rem); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.75rem); }
h4 { font-size: 1.125rem; }
p { margin-bottom: var(--space-md); }
.text-gold { color: var(--color-gold); }
.text-center { text-align: center; }
.text-uppercase { text-transform: uppercase; letter-spacing: 0.1em; }

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

/* --- Navigation --- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: box-shadow var(--transition);
}
.navbar.scrolled { box-shadow: var(--shadow-sm); }
.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}
.nav-logo img { height: 50px; width: auto; }
.nav-logo-text {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 700;
  line-height: 1.2;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-dark);
}
.nav-logo-text span { color: var(--color-gold); }
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}
.nav-links a {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-dark);
  position: relative;
  padding: 4px 0;
  transition: color var(--transition);
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 0; height: 2px;
  background: var(--color-gold);
  transition: width var(--transition);
}
.nav-links a:hover { color: var(--color-gold); }
.nav-links a:hover::after { width: 100%; }
.nav-right {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-dark);
  transition: all var(--transition);
}

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 90vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background-size: cover;
  background-position: center;
  z-index: 0;
}
.hero-overlay {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: linear-gradient(135deg, rgba(0,0,0,0.7) 0%, rgba(0,0,0,0.3) 60%, transparent 100%);
  z-index: 1;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 650px;
  padding: var(--space-3xl) 0;
}
.hero h1 {
  color: var(--color-white);
  font-size: clamp(2.5rem, 6vw, 4rem);
  letter-spacing: 0.05em;
  margin-bottom: var(--space-lg);
}
.hero p {
  color: rgba(255,255,255,0.85);
  font-size: 1.1rem;
  margin-bottom: var(--space-xl);
}
.hero-side-img {
  position: absolute;
  right: 5%;
  top: 50%;
  transform: translateY(-50%);
  height: 70vh;
  max-height: 600px;
  z-index: 2;
  border-radius: 8px;
  object-fit: cover;
  box-shadow: var(--shadow-lg);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition);
}
.btn-primary {
  background: var(--color-gold);
  color: var(--color-white);
}
.btn-primary:hover {
  background: var(--color-gold-light);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.btn-outline {
  background: transparent;
  color: var(--color-white);
  border: 2px solid var(--color-white);
}
.btn-outline:hover {
  background: var(--color-white);
  color: var(--color-dark);
}
.btn-dark {
  background: var(--color-dark);
  color: var(--color-white);
}
.btn-dark:hover {
  background: var(--color-black);
}

/* --- Section --- */
.section {
  padding: var(--space-3xl) 0;
}
.section-dark {
  background: var(--color-dark);
  color: var(--color-white);
}
.section-light {
  background: var(--color-light);
}
.section-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}
.section-header h2 {
  margin-bottom: var(--space-sm);
}
.section-header .accent-line {
  width: 60px;
  height: 3px;
  background: var(--color-gold);
  margin: var(--space-md) auto;
}
.section-header p {
  max-width: 600px;
  margin: 0 auto;
  color: var(--color-gray);
}

/* --- Service Grid --- */
.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}
.service-card {
  position: relative;
  background: var(--color-white);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  cursor: pointer;
}
.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.service-card-img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  background: var(--color-light);
}
.service-card-body {
  padding: var(--space-lg);
}
.service-card-body h3 {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-sm);
}
.service-card-body p {
  font-size: 0.9rem;
  color: var(--color-gray);
  margin-bottom: var(--space-md);
}
.service-card .learn-more {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-gold);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap var(--transition);
}
.service-card:hover .learn-more { gap: 10px; }

/* --- Doctors Grid --- */
.doctors-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}
.doctor-card {
  text-align: center;
}
.doctor-photo {
  width: 240px;
  height: 280px;
  margin: 0 auto var(--space-lg);
  border-radius: 8px;
  overflow: hidden;
  background: var(--color-light);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
}
.doctor-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.doctor-photo .placeholder-icon {
  font-size: 4rem;
  color: var(--color-border);
}
.doctor-card h3 {
  margin-bottom: var(--space-xs);
}
.doctor-card .credentials {
  font-size: 0.85rem;
  color: var(--color-gold);
  font-weight: 600;
  margin-bottom: var(--space-sm);
}
.doctor-card .bio {
  font-size: 0.9rem;
  color: var(--color-gray);
}

/* --- CTA / Booking Section --- */
.cta-section {
  padding: var(--space-3xl) 0;
  background: var(--color-dark);
  color: var(--color-white);
}
.cta-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: center;
}
.cta-content h2 {
  margin-bottom: var(--space-md);
}
.cta-content p {
  color: rgba(255,255,255,0.7);
  margin-bottom: var(--space-xl);
}
.cta-buttons {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}
.cta-buttons .btn {
  width: 100%;
  max-width: 320px;
}
.cta-image img {
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
}

/* --- Footer --- */
.footer {
  background: var(--color-black);
  color: var(--color-white);
  padding: var(--space-2xl) 0 var(--space-lg);
}
.footer-banner {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: 8px;
  margin-bottom: var(--space-2xl);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-2xl);
}
.footer-brand h4 {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-sm);
}
.footer-brand p {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.6);
}
.footer-links h4 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-gold);
  margin-bottom: var(--space-md);
}
.footer-links a {
  display: block;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.7);
  padding: 4px 0;
  transition: color var(--transition);
}
.footer-links a:hover { color: var(--color-white); }
.footer-contact p {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.7);
  margin-bottom: var(--space-xs);
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: var(--space-lg);
  text-align: center;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.4);
}

/* --- Service Detail Page --- */
.detail-hero {
  padding: calc(var(--nav-height) + var(--space-2xl)) 0 var(--space-2xl);
  background: var(--color-light);
}
.detail-hero .breadcrumb {
  font-size: 0.85rem;
  color: var(--color-gray);
  margin-bottom: var(--space-md);
}
.detail-hero .breadcrumb a { color: var(--color-gold); }
.detail-hero .breadcrumb a:hover { text-decoration: underline; }
.detail-content {
  padding: var(--space-2xl) 0;
}
.detail-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--space-2xl);
}
.detail-sidebar {
  position: sticky;
  top: calc(var(--nav-height) + var(--space-lg));
  align-self: start;
}
.sidebar-card {
  background: var(--color-light);
  border-radius: 8px;
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
}
.sidebar-card h4 {
  margin-bottom: var(--space-sm);
  color: var(--color-gold);
}
.detail-section {
  margin-bottom: var(--space-2xl);
}
.detail-section h3 {
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-gold);
  display: inline-block;
}
.detail-section ul {
  padding-left: var(--space-lg);
  list-style: disc;
}
.detail-section li {
  margin-bottom: var(--space-xs);
  font-size: 0.95rem;
}
.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
  margin-top: var(--space-lg);
}
.process-step {
  text-align: center;
  padding: var(--space-lg);
  background: var(--color-light);
  border-radius: 8px;
}
.process-step .step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-gold);
  color: var(--color-white);
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: var(--space-sm);
}
.process-step h4 {
  margin-bottom: var(--space-xs);
}
.process-step p {
  font-size: 0.85rem;
  color: var(--color-gray);
}

/* Comparison table */
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: var(--space-md);
}
.comparison-table th,
.comparison-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.9rem;
}
.comparison-table th {
  background: var(--color-light);
  font-weight: 700;
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
}
.comparison-table tr:hover td {
  background: rgba(199,147,35,0.05);
}

/* --- Contact Page --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
}
.contact-info h3 {
  margin-bottom: var(--space-md);
}
.contact-info .info-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}
.info-item .icon {
  width: 40px;
  height: 40px;
  background: var(--color-gold);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}
.contact-form .form-group {
  margin-bottom: var(--space-md);
}
.contact-form label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 4px;
}
.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  transition: border-color var(--transition);
}
.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--color-gold);
}

/* --- Version Badge --- */
.version-badge {
  font-size: 0.65rem;
  color: var(--color-gray);
  letter-spacing: 0.05em;
  padding: 2px 8px;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  white-space: nowrap;
}

/* --- Loading Spinner --- */
.page-loading {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.5s;
}
.page-loading.hidden {
  opacity: 0;
  pointer-events: none;
}