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

:root {
  --primary: #FF6B35;
  --secondary: #004E89;
  --accent: #FCBF49;
  --danger: #E63946;
  --success: #2D6A4F;
  --dark: #1A1A2E;
  --light: #F7F7F7;
  --border-width: 4px;
  --shadow: 6px 6px 0px var(--dark);
  --shadow-sm: 4px 4px 0px var(--dark);
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: var(--light);
  min-height: 100vh;
  background-image: 
    radial-gradient(circle at 20% 50%, rgba(255,107,53,0.05) 0%, transparent 50%),
    radial-gradient(circle at 80% 50%, rgba(0,78,137,0.05) 0%, transparent 50%);
}

.page {
  display: none;
}

.page.active {
  display: block;
}

.brutal-card {
  background: white;
  border: var(--border-width) solid var(--dark);
  box-shadow: var(--shadow);
  padding: 2rem;
  border-radius: 0;
}

.login-card {
  max-width: 450px;
  margin: 10vh auto;
  text-align: center;
}

.login-card h1 {
  font-size: 1.8rem;
  color: var(--dark);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 2px;
}

.subtitle {
  color: #666;
  margin-bottom: 2rem;
  font-weight: 600;
}

.input-group {
  text-align: left;
  margin-bottom: 1.2rem;
}

.input-group label {
  display: block;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--dark);
  font-size: 0.9rem;
  text-transform: uppercase;
}

.input-group input,
.input-group select {
  width: 100%;
  padding: 0.8rem 1rem;
  border: var(--border-width) solid var(--dark);
  font-size: 1rem;
  background: white;
  box-shadow: var(--shadow-sm);
  transition: all 0.15s;
  border-radius: 0;
}

.input-group input:focus,
.input-group select:focus {
  outline: none;
  box-shadow: 2px 2px 0px var(--dark);
  transform: translate(2px, 2px);
}

.brutal-btn {
  padding: 0.8rem 1.5rem;
  border: var(--border-width) solid var(--dark);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 1px;
  transition: all 0.15s;
  box-shadow: var(--shadow-sm);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border-radius: 0;
}

.brutal-btn:hover {
  box-shadow: 2px 2px 0px var(--dark);
  transform: translate(2px, 2px);
}

.brutal-btn:active {
  box-shadow: 0px 0px 0px var(--dark);
  transform: translate(4px, 4px);
}

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

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

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

.navbar {
  background: var(--dark);
  border-bottom: var(--border-width) solid var(--dark);
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.nav-brand {
  color: var(--accent);
  font-size: 1.2rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 2px;
}

.nav-links {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.nav-btn {
  padding: 0.5rem 1rem;
  background: transparent;
  border: 3px solid var(--accent);
  color: var(--accent);
  font-weight: 700;
  cursor: pointer;
  font-size: 0.85rem;
  text-transform: uppercase;
  transition: all 0.15s;
}

.nav-btn:hover,
.nav-btn.active {
  background: var(--accent);
  color: var(--dark);
}

.logout-btn {
  border-color: var(--danger);
  color: var(--danger);
}

.logout-btn:hover {
  background: var(--danger);
  color: white;
}

.container {
  max-width: 1000px;
  margin: 2rem auto;
  padding: 0 1rem;
}

.user-info-bar {
  display: flex;
  gap: 1.5rem;
  background: var(--dark);
  color: white;
  padding: 1rem 1.5rem;
  border: var(--border-width) solid var(--dark);
  box-shadow: var(--shadow-sm);
  margin-bottom: 2rem;
  flex-wrap: wrap;
  font-weight: 600;
}

.section {
  display: none;
}

.section.active {
  display: block;
}

.section h2 {
  font-size: 1.5rem;
  color: var(--dark);
  margin-bottom: 1.5rem;
  text-transform: uppercase;
  border-bottom: var(--border-width) solid var(--dark);
  padding-bottom: 0.5rem;
}

.generator-controls {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.generator-controls select {
  padding: 0.8rem 1rem;
  border: var(--border-width) solid var(--dark);
  box-shadow: var(--shadow-sm);
  font-size: 1rem;
  min-width: 150px;
  background: white;
}

.result-container {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.link-card {
  background: white;
  border: var(--border-width) solid var(--dark);
  box-shadow: var(--shadow-sm);
  padding: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.link-card .link-info {
  flex: 1;
  min-width: 200px;
}

.link-card .link-icon {
  font-size: 2rem;
  color: var(--primary);
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 3px solid var(--dark);
  background: var(--accent);
}

.link-card .link-info h4 {
  text-transform: uppercase;
  margin-bottom: 0.3rem;
  color: var(--dark);
}

.link-card .link-info input {
  width: 100%;
  padding: 0.5rem;
  border: 2px solid #ccc;
  font-size: 0.85rem;
  background: #f5f5f5;
  font-family: monospace;
}

.link-card .go-btn {
  padding: 0.8rem 1.5rem;
  background: var(--success);
  color: white;
  border: var(--border-width) solid var(--dark);
  font-weight: 700;
  cursor: pointer;
  text-transform: uppercase;
  box-shadow: var(--shadow-sm);
  transition: all 0.15s;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  white-space: nowrap;
}

.link-card .go-btn:hover {
  box-shadow: 2px 2px 0px var(--dark);
  transform: translate(2px, 2px);
}

.redeem-form {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.redeem-form input {
  flex: 1;
  min-width: 200px;
  padding: 0.8rem 1rem;
  border: var(--border-width) solid var(--dark);
  box-shadow: var(--shadow-sm);
  font-size: 1rem;
}

.msg-box, .error-msg {
  margin-top: 1rem;
  padding: 1rem;
  font-weight: 700;
  border: var(--border-width) solid var(--dark);
}

.msg-box.success {
  background: #d4edda;
  color: var(--success);
}

.msg-box.error, .error-msg {
  background: #f8d7da;
  color: var(--danger);
}

.msg-box.info {
  background: #cce5ff;
  color: var(--secondary);
}

.payment-info-card {
  background: white;
  border: var(--border-width) solid var(--dark);
  box-shadow: var(--shadow-sm);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.payment-info-card h3 {
  color: var(--dark);
  margin-bottom: 0.5rem;
}

.payment-info-card .price-tag {
  font-size: 2rem;
  font-weight: 900;
  color: var(--primary);
}

.payment-info-card .price-tag .discount {
  text-decoration: line-through;
  color: #999;
  font-size: 1.2rem;
  margin-right: 0.5rem;
}

.payment-result-box {
  margin-top: 1.5rem;
}

.qr-container {
  background: white;
  border: var(--border-width) solid var(--dark);
  box-shadow: var(--shadow-sm);
  padding: 2rem;
  text-align: center;
}

.qr-container img {
  max-width: 300px;
  width: 100%;
  border: var(--border-width) solid var(--dark);
  margin: 1rem 0;
}

.qr-container .status-badge {
  display: inline-block;
  padding: 0.5rem 1rem;
  font-weight: 700;
  text-transform: uppercase;
  border: 3px solid var(--dark);
}

.qr-container .status-badge.pending {
  background: var(--accent);
  color: var(--dark);
}

.qr-container .status-badge.success {
  background: var(--success);
  color: white;
}

.qr-container .status-badge.failed {
  background: var(--danger);
  color: white;
}

.expired-info {
  margin-top: 1rem;
  font-size: 0.9rem;
  color: #666;
}

.profile-info {
  background: white;
  border: var(--border-width) solid var(--dark);
  box-shadow: var(--shadow-sm);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.profile-info .info-row {
  display: flex;
  justify-content: space-between;
  padding: 0.5rem 0;
  border-bottom: 2px solid #eee;
}

.profile-info .info-row:last-child {
  border-bottom: none;
}

.profile-edit {
  background: white;
  border: var(--border-width) solid var(--dark);
  box-shadow: var(--shadow-sm);
  padding: 1.5rem;
}

.profile-edit h3 {
  margin-bottom: 1rem;
  color: var(--dark);
}

.admin-tabs {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
  border-bottom: var(--border-width) solid var(--dark);
  padding-bottom: 0.5rem;
}

.admin-tab {
  padding: 0.5rem 1rem;
  background: white;
  border: 3px solid var(--dark);
  cursor: pointer;
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  transition: all 0.15s;
}

.admin-tab:hover,
.admin-tab.active {
  background: var(--dark);
  color: var(--accent);
}

.admin-panel {
  display: none;
  background: white;
  border: var(--border-width) solid var(--dark);
  box-shadow: var(--shadow-sm);
  padding: 1.5rem;
}

.admin-panel.active {
  display: block;
}

.admin-panel h3 {
  color: var(--dark);
  margin-bottom: 1rem;
  text-transform: uppercase;
}

.admin-panel h4 {
  color: var(--dark);
  margin: 1.5rem 0 0.5rem;
}

.admin-list {
  margin-top: 1rem;
}

.admin-list-item {
  background: #f9f9f9;
  border: 3px solid var(--dark);
  padding: 1rem;
  margin-bottom: 0.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.admin-list-item .item-info {
  flex: 1;
  min-width: 200px;
}

.admin-list-item .item-info strong {
  color: var(--dark);
}

.admin-list-item .item-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.admin-list-item .item-actions button,
.admin-list-item .item-actions input {
  padding: 0.4rem 0.8rem;
  font-size: 0.8rem;
  border: 2px solid var(--dark);
}

.admin-list-item .item-actions input {
  width: 80px;
}

.loading-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(26,26,46,0.9);
  z-index: 9999;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  color: white;
}

.loading-overlay.show {
  display: flex;
}

.spinner {
  width: 50px;
  height: 50px;
  border: 5px solid var(--accent);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

@media (max-width: 768px) {
  .navbar {
    padding: 1rem;
  }
  
  .nav-brand {
    font-size: 1rem;
    width: 100%;
    text-align: center;
  }
  
  .nav-links {
    width: 100%;
    justify-content: center;
  }
  
  .nav-btn {
    font-size: 0.75rem;
    padding: 0.4rem 0.6rem;
  }
  
  .user-info-bar {
    flex-direction: column;
    gap: 0.5rem;
    font-size: 0.9rem;
  }
  
  .link-card {
    flex-direction: column;
    text-align: center;
  }
  
  .link-card .go-btn {
    width: 100%;
    justify-content: center;
  }
  
  .generator-controls {
    flex-direction: column;
  }
  
  .generator-controls select {
    width: 100%;
  }
  
  .admin-tabs {
    gap: 0.3rem;
  }
  
  .admin-tab {
    font-size: 0.7rem;
    padding: 0.3rem 0.6rem;
  }
  
  .admin-list-item {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .login-card {
    margin: 5vh 1rem;
    padding: 1.5rem;
  }
  
  .login-card h1 {
    font-size: 1.3rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 0.5rem;
  }
  
  .section h2 {
    font-size: 1.2rem;
  }
  
  .brutal-btn {
    font-size: 0.85rem;
    padding: 0.6rem 1rem;
  }
}