/* =============================================
   VAT Withholding Calculator Website Styles
   For Overseas Chinese Users in HK & Macao
   ============================================= */

:root {
  --primary: #c41e3a;
  --primary-dark: #8b1529;
  --secondary: #2b5a9e;
  --accent: #f4d03f;
  --dark: #1a1a2e;
  --light: #f8f9fa;
  --gray: #6c757d;
  --success: #28a745;
  --warning: #ffc107;
  --danger: #dc3545;
  --shadow: 0 4px 6px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.15);
  --radius: 8px;
  --radius-lg: 12px;
  --transition: all 0.3s ease;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #f5f7fa 0%, #e4e8ec 100%);
  color: var(--dark);
  line-height: 1.6;
  min-height: 100vh;
}

/* =============================================
   Navigation
   ============================================= */

.navbar {
  background: linear-gradient(90deg, var(--primary-dark) 0%, var(--primary) 100%);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-lg);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: white;
  text-decoration: none;
  font-size: 1.4rem;
  font-weight: 700;
}

.logo img {
  height: 40px;
  width: auto;
  border-radius: var(--radius);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-links {
  display: flex;
  gap: 0.5rem;
  list-style: none;
}

.nav-links a {
  color: rgba(255,255,255,0.9);
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  transition: var(--transition);
  font-weight: 500;
}

.nav-links a:hover,
.nav-links a.active {
  background: rgba(255,255,255,0.15);
  color: white;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: white;
  font-size: 1.5rem;
  cursor: pointer;
}

/* =============================================
   Language Switcher
   ============================================= */

.lang-switcher {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  margin-left: 0.75rem;
  padding-left: 0.75rem;
  border-left: 1px solid rgba(255,255,255,0.25);
}

.lang-item {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(255,255,255,0.1);
  border: 2px solid transparent;
  transition: var(--transition);
  text-decoration: none;
  overflow: hidden;
  cursor: pointer;
}

.lang-item:hover {
  background: rgba(255,255,255,0.25);
  transform: scale(1.1);
}

.lang-item.active {
  border-color: var(--accent);
  background: rgba(255,255,255,0.25);
  box-shadow: 0 0 0 2px rgba(244,208,63,0.3);
}

.lang-item img {
  width: 20px;
  height: 20px;
  object-fit: contain;
  border-radius: 2px;
}

.lang-item .lang-text {
  color: white;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

/* =============================================
   Hero Section
   ============================================= */

.hero {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--secondary) 100%);
  color: white;
  padding: 4rem 1.5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: url('../images/chinese-flag-1024x495.webp') center/cover;
  opacity: 0.08;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 2.8rem;
  margin-bottom: 1rem;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.hero p {
  font-size: 1.2rem;
  margin-bottom: 2rem;
  opacity: 0.95;
}

.hero-badges {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.hero-badge {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255,255,255,0.15);
  padding: 0.5rem 1rem;
  border-radius: 50px;
  backdrop-filter: blur(5px);
}

.hero-badge img {
  height: 24px;
  width: auto;
}

/* =============================================
   Buttons
   ============================================= */

.btn {
  display: inline-block;
  padding: 0.875rem 2rem;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition);
  border: none;
  cursor: pointer;
  font-size: 1rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent) 0%, #e6c229 100%);
  color: var(--dark);
  box-shadow: 0 4px 15px rgba(244,208,63,0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(244,208,63,0.4);
}

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

.btn-secondary:hover {
  background: transparent;
  color: white;
}

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

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

/* =============================================
   Container & Cards
   ============================================= */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section { padding: 3rem 0; }

.section-title {
  text-align: center;
  margin-bottom: 2.5rem;
}

.section-title h2 {
  font-size: 2rem;
  color: var(--primary-dark);
  margin-bottom: 0.5rem;
}

.section-title p {
  color: var(--gray);
  font-size: 1.1rem;
}

.card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
}

.card-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.card-icon {
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.5rem;
}

/* =============================================
   Grid Layouts
   ============================================= */

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

/* =============================================
   Calculator Section
   ============================================= */

.calculator-section {
  background: white;
  padding: 3rem 0;
}

.calculator-container {
  max-width: 900px;
  margin: 0 auto;
  background: linear-gradient(135deg, #fff 0%, #f8f9fa 100%);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-lg);
  border: 1px solid #e0e0e0;
}

.form-group { margin-bottom: 1.5rem; }

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

.form-input,
.form-select {
  width: 100%;
  padding: 0.875rem;
  border: 2px solid #e0e0e0;
  border-radius: var(--radius);
  font-size: 1rem;
  transition: var(--transition);
  font-family: inherit;
}

.form-input:focus,
.form-select:focus {
  outline: none;
  border-color: var(--secondary);
  box-shadow: 0 0 0 3px rgba(43,90,158,0.1);
}

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

.result-box {
  background: linear-gradient(135deg, #e8f5e9 0%, #c8e6c9 100%);
  border: 2px solid var(--success);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-top: 1.5rem;
  display: none;
}

.result-box.show {
  display: block;
  animation: fadeIn 0.5s ease;
}

.result-box h3 {
  color: var(--success);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.result-item {
  display: flex;
  justify-content: space-between;
  padding: 0.75rem 0;
  border-bottom: 1px solid rgba(0,0,0,0.1);
}

.result-item.total {
  font-weight: 700;
  font-size: 1.1rem;
  border-top: 2px solid var(--success);
  border-bottom: none;
  margin-top: 0.5rem;
  padding-top: 1rem;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* =============================================
   Features / Info Boxes
   ============================================= */

.feature-card {
  text-align: center;
  padding: 2rem 1.5rem;
}

.feature-card img {
  height: 80px;
  width: auto;
  margin-bottom: 1rem;
  border-radius: var(--radius);
}

.feature-card h3 {
  color: var(--primary-dark);
  margin-bottom: 0.75rem;
  font-size: 1.2rem;
}

.feature-card p {
  color: var(--gray);
  font-size: 0.95rem;
}

/* =============================================
   Info Banner
   ============================================= */

.info-banner {
  background: linear-gradient(135deg, var(--secondary) 0%, #1e3a5f 100%);
  color: white;
  padding: 2.5rem 1.5rem;
  text-align: center;
}

.info-banner h2 {
  font-size: 1.8rem;
  margin-bottom: 0.75rem;
}

.info-banner p {
  opacity: 0.9;
  max-width: 700px;
  margin: 0 auto;
}

/* =============================================
   Rules / Content Pages
   ============================================= */

.content-page {
  background: white;
  min-height: calc(100vh - 200px);
}

.content-header {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--secondary) 100%);
  color: white;
  padding: 3rem 1.5rem;
  text-align: center;
}

.content-header h1 {
  font-size: 2.2rem;
  margin-bottom: 0.5rem;
}

.content-body {
  max-width: 900px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

.content-body h2 {
  color: var(--primary-dark);
  margin: 2rem 0 1rem;
  font-size: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid #e0e0e0;
}

.content-body h3 {
  color: var(--secondary);
  margin: 1.5rem 0 0.75rem;
  font-size: 1.2rem;
}

.content-body p {
  margin-bottom: 1rem;
  color: #444;
  line-height: 1.7;
}

.content-body ul,
.content-body ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.content-body li {
  margin-bottom: 0.5rem;
  color: #444;
}

.rule-box {
  background: #f8f9fa;
  border-left: 4px solid var(--primary);
  padding: 1.25rem;
  margin: 1.5rem 0;
  border-radius: 0 var(--radius) var(--radius) 0;
}

.rule-box strong {
  color: var(--primary-dark);
}

.rate-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  box-shadow: var(--shadow);
  border-radius: var(--radius);
  overflow: hidden;
}

.rate-table th,
.rate-table td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid #e0e0e0;
}

.rate-table th {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--secondary) 100%);
  color: white;
  font-weight: 600;
}

.rate-table tr:nth-child(even) { background: #f8f9fa; }

.rate-table tr:hover { background: #e3f2fd; }

/* =============================================
   Contact Page
   ============================================= */

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.contact-info-card {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--secondary) 100%);
  color: white;
  padding: 2rem;
  border-radius: var(--radius-lg);
}

.contact-info-card h3 {
  margin-bottom: 1.5rem;
  font-size: 1.3rem;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.contact-item i {
  font-size: 1.2rem;
  margin-top: 0.2rem;
}

.contact-item p {
  margin: 0;
  opacity: 0.9;
}

.contact-form .form-group { margin-bottom: 1.25rem; }

/* =============================================
   Footer
   ============================================= */

.footer {
  background: var(--dark);
  color: white;
  padding: 2.5rem 0 1.5rem;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-section h4 {
  color: var(--accent);
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

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

.footer-section ul li { margin-bottom: 0.5rem; }

.footer-section a {
  color: rgba(255,255,255,0.7);
  text-decoration: none;
  transition: var(--transition);
}

.footer-section a:hover { color: white; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 1.5rem;
  text-align: center;
  color: rgba(255,255,255,0.6);
  font-size: 0.9rem;
}

.footer-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255,255,255,0.1);
  padding: 0.25rem 0.75rem;
  border-radius: 50px;
  margin-top: 0.5rem;
}

.footer-badge img {
  height: 18px;
  width: auto;
}

/* =============================================
   Disclaimer
   ============================================= */

.disclaimer {
  background: #fff3cd;
  border: 1px solid #ffc107;
  border-radius: var(--radius);
  padding: 1rem;
  margin: 2rem 0;
  font-size: 0.9rem;
  color: #856404;
}

.disclaimer strong {
  display: block;
  margin-bottom: 0.5rem;
}

/* =============================================
   Image Styling
   ============================================= */

.img-fluid {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
}

.img-rounded { border-radius: var(--radius-lg); }

.img-shadow { box-shadow: var(--shadow-lg); }

.about-hero-img {
  width: 100%;
  max-height: 300px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  margin-bottom: 2rem;
}

/* =============================================
   Responsive Design
   ============================================= */

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--primary-dark);
    flex-direction: column;
    padding: 1rem;
    gap: 0.5rem;
  }

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

  .mobile-toggle { display: block; }

  .lang-switcher {
    margin-left: auto;
    padding-left: 0.5rem;
    border-left: none;
  }

  .hero h1 { font-size: 2rem; }
  .hero p { font-size: 1rem; }

  .form-row { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .result-grid { grid-template-columns: 1fr; }
  .calculator-container { padding: 1.5rem; }
  .section-title h2 { font-size: 1.6rem; }
}

/* =============================================
   Utilities
   ============================================= */

.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.font-bold { font-weight: 700; }
.text-primary { color: var(--primary); }
.text-secondary { color: var(--secondary); }
.text-success { color: var(--success); }
.text-gray { color: var(--gray); }
.bg-light { background: var(--light); }