/* ===================================
   TCCC-AI - Modern Minimalist Design
   =================================== */

:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --secondary: #64748b;
  --bg: #f8fafc;
  --card-bg: #ffffff;
  --text: #1e293b;
  --text-light: #64748b;
  --border: #e2e8f0;
  --success: #10b981;
  --error: #ef4444;
  --warning: #f59e0b;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.15);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* Header */
header {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo span {
  background: linear-gradient(135deg, var(--primary), #8b5cf6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.nav a {
  color: var(--text-light);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

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

.nav .btn {
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
}

/* Main content */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

/* Hero section */
.hero {
  text-align: center;
  padding: 4rem 2rem;
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
  border-radius: var(--radius);
  margin-bottom: 2rem;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 1rem;
  color: var(--text);
}

.hero p {
  font-size: 1.2rem;
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto 2rem;
}

.hero .features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-top: 3rem;
  text-align: left;
}

.feature {
  background: var(--card-bg);
  padding: 1.5rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.feature h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.feature p {
  font-size: 0.95rem;
  color: var(--text-light);
  margin: 0;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
  font-size: 1rem;
}

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

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--card-bg);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
}

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

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

.btn-block {
  width: 100%;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* Forms */
.form-container {
  max-width: 400px;
  margin: 2rem auto;
  padding: 2rem;
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
}

.form-container h2 {
  text-align: center;
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
}

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

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group .hint {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-top: 0.25rem;
}

.form-footer {
  text-align: center;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.form-footer a {
  color: var(--primary);
  text-decoration: none;
}

.form-footer a:hover {
  text-decoration: underline;
}

.form-error {
  color: var(--error);
  font-size: 0.9rem;
  margin-top: 0.5rem;
  text-align: center;
}

.form-success {
  color: var(--success);
  font-size: 0.9rem;
  margin-top: 0.5rem;
  text-align: center;
}

/* Dashboard */
.dashboard-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

.dashboard-header h1 {
  font-size: 1.75rem;
}

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

.stat-card {
  background: var(--card-bg);
  padding: 1.5rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.stat-card .label {
  font-size: 0.9rem;
  color: var(--text-light);
}

.stat-card .value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text);
}

.dashboard-section {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.dashboard-section h2 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Task list */
.task-form {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.task-form input {
  flex: 1;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
}

.task-list {
  list-style: none;
}

.task-item {
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 0.75rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: border-color 0.2s;
  cursor: pointer;
}

.task-item:hover {
  border-color: var(--primary);
}

.task-info {
  flex: 1;
}

.task-url {
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.25rem;
}

.task-meta {
  font-size: 0.85rem;
  color: var(--text-light);
  display: flex;
  gap: 1rem;
}

.task-status {
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
}

.status-pending {
  background: #fef3c7;
  color: #92400e;
}

.status-processing {
  background: #dbeafe;
  color: #1e40af;
}

.status-completed {
  background: #d1fae5;
  color: #065f46;
}

.status-error {
  background: #fee2e2;
  color: #991b1b;
}

/* Task detail */
.task-detail {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 2rem;
}

.task-detail-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.task-detail-header h2 {
  font-size: 1.5rem;
}

.task-detail-url {
  color: var(--primary);
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  word-break: break-all;
}

.task-detail-status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  font-weight: 600;
}

.task-detail-actions {
  margin-top: 1.5rem;
  display: flex;
  gap: 1rem;
}

/* Payment methods */
.payment-methods {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.payment-method {
  padding: 1.5rem;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
}

.payment-method:hover {
  border-color: var(--primary);
}

.payment-method.selected {
  border-color: var(--primary);
  background: #f0f9ff;
}

.payment-method h3 {
  font-size: 1.1rem;
  margin-bottom: 0.25rem;
}

.payment-method p {
  font-size: 0.85rem;
  color: var(--text-light);
}

.invoice-info {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-top: 1.5rem;
}

.invoice-info h3 {
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

.invoice-address {
  background: #f1f5f9;
  padding: 1rem;
  border-radius: var(--radius);
  font-family: monospace;
  word-break: break-all;
  margin: 0.5rem 0;
}

.copy-btn {
  background: var(--primary);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

.qr-placeholder {
  width: 200px;
  height: 200px;
  background: #f1f5f9;
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 1rem auto;
  color: var(--text-light);
}

/* Loading spinner */
.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 2rem auto;
}

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

.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.9);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.loading-overlay p {
  margin-top: 1rem;
  color: var(--text-light);
}

/* Empty state */
.empty-state {
  text-align: center;
  padding: 3rem;
  color: var(--text-light);
}

.empty-state h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
  color: var(--text);
}

/* Footer */
footer {
  text-align: center;
  padding: 2rem;
  color: var(--text-light);
  font-size: 0.9rem;
  border-top: 1px solid var(--border);
  margin-top: 3rem;
}

/* Utility classes */
.text-center { text-align: center; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.hidden { display: none !important; }

/* Responsive */
@media (max-width: 768px) {
  header {
    padding: 1rem;
    flex-direction: column;
    gap: 1rem;
  }
  
  main {
    padding: 1rem;
  }
  
  .hero h1 {
    font-size: 1.75rem;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  .task-form {
    flex-direction: column;
  }
  
  .dashboard-header {
    flex-direction: column;
    gap: 1rem;
    align-items: flex-start;
  }
}

/* Language Switcher */
.lang-switcher {
  display: flex;
  gap: 0.25rem;
  margin-right: 1rem;
}

.lang-switcher-btn {
  background: transparent;
  border: 1px solid var(--border-color, #333);
  color: var(--text-light, #aaa);
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
  cursor: pointer;
  border-radius: 4px;
  transition: all 0.2s;
}

.lang-switcher-btn:hover {
  background: var(--bg-secondary, #222);
  color: var(--text-color, #fff);
}

.lang-switcher-btn.active {
  background: var(--accent-color, #00d4aa);
  border-color: var(--accent-color, #00d4aa);
  color: #000;
  font-weight: 600;
}