:root {
  --primary: #0052cc;
  --primary-dark: #003a96;
  --text: #1a1a1a;
  --text-muted: #666666;
  --border: #efefef;
  --bg: #fafafa;
  --surface: #ffffff;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --radius-md: 10px;
  --radius-lg: 14px;
}
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  max-width: 512px;
  margin: 0 auto;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.section {
  animation: fadeInUp 0.6s ease-out forwards;
}

.section:nth-child(1) { animation-delay: 0.1s; }
.section:nth-child(2) { animation-delay: 0.2s; }
.section:nth-child(3) { animation-delay: 0.3s; }
.section:nth-child(4) { animation-delay: 0.4s; }
.section:nth-child(5) { animation-delay: 0.5s; }
.section:nth-child(6) { animation-delay: 0.6s; }

main {
  flex: 1;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
}

/* Header */
.header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 16px 20px;
  position: sticky;
  top: 0;
  z-index: 40;
  box-shadow: var(--shadow-sm);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  color: var(--text);
}

.logo-img {
  width: 44px;
  height: 44px;
  object-fit: contain;
  border-radius: 50%;
  padding: 4px;
  background: white;
  box-shadow: var(--shadow-sm);
}

.logo-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.logo-text strong {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
}

.logo-text span {
  font-size: 0.65rem;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  flex: 1;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 60px 0 40px;
}

.hero h1 {
  font-size: clamp(2rem, 6vw, 3rem);
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text);
  letter-spacing: -0.02em;
}

.hero p {
  color: var(--text-muted);
  font-size: clamp(1rem, 2vw, 1.1rem);
  margin-bottom: 0;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* Section */
.section {
  margin-bottom: 32px;
}

.section-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 18px;
  color: var(--text);
}

/* Cards Grid */
.cards-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 600px) {
  .cards-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* Card */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.3s ease;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card-image {
  width: 100%;
  height: 120px;
  background: linear-gradient(135deg, #e8f0ff 0%, #f0e8ff 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  position: relative;
  border-bottom: 1px solid var(--border);
}

.card-content {
  padding: 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.card-badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(0, 82, 204, 0.08);
  color: var(--primary);
  font-weight: 600;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  width: fit-content;
  margin-bottom: 10px;
}

.card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
}

.card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  flex: 1;
  line-height: 1.5;
}

.card-meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.meta-tag {
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
}

.card-btn {
  background: var(--primary);
  color: white;
  border: none;
  padding: 11px 16px;
  border-radius: var(--radius-md);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  align-self: flex-start;
  font-size: 0.9rem;
}

.card-btn:hover:not(:disabled) {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.card-btn:active:not(:disabled) {
  transform: scale(0.98);
}

.card-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Campaign Header */
.campaign-header {
  background: linear-gradient(135deg, #f0f4ff 0%, #f9f5ff 100%);
  padding: 32px 20px 24px;
  margin: 0 -20px 28px;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
}

.campaign-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
}

.campaign-header h1 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text);
}

.campaign-header p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin: 0;
}

/* Form */
.form-group {
  margin-bottom: 24px;
}

.form-label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text);
}

.form-input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-family: inherit;
  transition: all 0.2s ease;
}

.form-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-input::placeholder {
  color: var(--text-muted);
}

.form-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 6px;
}

/* Button */
.btn {
  width: 100%;
  padding: 14px 20px;
  border: none;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-primary:active:not(:disabled) {
  transform: scale(0.98);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

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

.btn-secondary:hover {
  background: rgba(99, 102, 241, 0.05);
}

/* Campaign Info Box */
.info-box {
  background: rgba(99, 102, 241, 0.05);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: var(--radius-lg);
  padding: 16px;
  margin-bottom: 24px;
  transition: all 0.3s ease;
}

.info-box:hover {
  background: rgba(99, 102, 241, 0.08);
  border-color: rgba(99, 102, 241, 0.4);
  transform: translateY(-1px);
}

.info-box h3 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
}

.info-box p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin: 0;
}

.info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 12px;
}

.info-item {
  background: white;
  padding: 10px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

.info-item strong {
  display: block;
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}

.info-item span {
  display: block;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
}

/* Footer */
.footer {
  padding: 40px 20px;
  background: var(--surface);
  border-top: 1px solid var(--border);
  margin-top: 80px;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 40px;
  margin-bottom: 30px;
}

.footer-section h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
}

.footer-section p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin: 0;
}

.footer-section ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-section li {
  margin-bottom: 8px;
}

.footer-section a {
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: color 0.2s ease;
}

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

.footer-divider {
  border-top: 1px solid var(--border);
  padding-top: 24px;
}

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-copyright {
  font-size: 0.8rem;
  color: var(--text-muted);
}

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

.footer-social a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: var(--bg);
  color: var(--text-muted);
  transition: all 0.2s ease;
  font-size: 0.9rem;
}

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

/* Back Button */
.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 20px;
  transition: all 0.2s ease;
}

.back-btn:hover {
  gap: 12px;
}

/* Success State */
.success-message {
  display: none;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: var(--success);
  padding: 14px 16px;
  border-radius: var(--radius-lg);
  margin-bottom: 20px;
  font-weight: 600;
}

.success-message.show {
  display: block;
  animation: slideDown 0.3s ease;
}

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

/* Loading */
.btn.loading {
  position: relative;
  color: transparent;
}

.btn.loading::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  border: 2px solid currentColor;
  border-radius: 50%;
  border-top-color: transparent;
  animation: spin 0.6s linear infinite;
}

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

/* Responsive */
@media (max-width: 600px) {
  .header-inner {
    padding: 0 4px;
  }

  .logo-text span {
    display: none;
  }

  .container {
    padding: 16px;
  }

  .hero {
    padding: 32px 0;
  }

  .campaign-header {
    margin: -16px -16px 24px;
  }

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

@media (max-width: 380px) {
  .hero h1 {
    font-size: 1.5rem;
  }

  .section-title {
    font-size: 1rem;
  }

  .campaign-header h1 {
    font-size: 1.5rem;
  }

  .btn {
    padding: 12px 16px;
    font-size: 0.95rem;
  }

  .form-input {
    padding: 10px 12px;
    font-size: 16px;
  }
}