:root {
   --primary: #2563eb;
   --primary-dark: #1d4ed8;
   --secondary: #10b981;
   --danger: #ef4444;
   --warning: #f59e0b;
   --white: #ffffff;
   --bg-card: #ffffff;
   --bg-light: #f8fafc;
   --text-primary: #1e293b;
   --text-secondary: #64748b;
   --text-muted: #64748b;
   --border-color: #e2e8f0;
   --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
   --radius: 8px;
}

.hero-duplicate {
   padding: 4rem 0;
   text-align: center;
   border-bottom: 1px solid var(--border-color);
   box-shadow: var(--shadow);
   background: linear-gradient(135deg, #ffffff, #fcfdff);
}

.hero-duplicate h1 {
   font-size: 2.2rem;
   margin-bottom: 1.5rem;
   color: var(--text-primary);
}

.hero-duplicate p {
   font-size: 1.1rem;
   max-width: 800px;
   margin: 0 auto 2rem;
   color: var(--text-secondary);
}

.generator {
   background: var(--white);
   border-radius: var(--radius);
   padding: 2.5rem;
   margin: 3rem 0;
   box-shadow: var(--shadow);
}

.generator h2 {
   font-size: 2rem;
   margin-bottom: 1.5rem;
   color: var(--primary);
   text-align: center;
}

.tips {
   background: #eff6ff;
   border-left: 4px solid var(--primary);
   padding: 1rem 1.5rem;
   margin: 2rem 0;
   border-radius: 0 var(--radius) var(--radius) 0;
}

.tips h3 {
   color: var(--primary);
   margin-bottom: 0.5rem;
}

.tips ul {
   padding-left: 1.5rem;
}

.tips li {
   margin-bottom: 0.5rem;
}

.duplicate-form .form-group {
   margin-bottom: 1rem;
}

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

.form-hint {
   display: block;
   margin-top: 0.35rem;
   font-size: 0.875rem;
   color: var(--text-muted);
}

.form-control {
   width: 100%;
   padding: 0.75rem 1rem;
   border: 1px solid #d1d5db;
   border-radius: var(--radius);
   font-size: 1rem;
   transition: border-color 0.3s, box-shadow 0.3s;
}

.form-control:focus {
   outline: none;
   border-color: var(--primary);
   box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

.form-control.textarea-input {
   min-height: 180px;
   resize: vertical;
   font-family: inherit;
}

.duplicate-columns {
   display: grid;
   grid-template-columns: 1fr 1fr;
   gap: 2rem;
   margin: 1.5rem 0;
}

.duplicate-col {
   padding: 1.25rem;
   background: var(--bg-light);
   border-radius: var(--radius);
   border: 1px solid var(--border-color);
}

.duplicate-col h3 {
   font-size: 1.1rem;
   margin-bottom: 1rem;
   color: var(--primary);
}

.duplicate-col h3 i {
   margin-right: 0.5rem;
}

.url-load-group {
   margin-top: 1rem;
}

.url-load-group label {
   font-size: 0.9rem;
   font-weight: 500;
}

.url-input-wrap {
   display: flex;
   gap: 0.5rem;
   margin-top: 0.5rem;
   flex-wrap: wrap;
}

.url-input-wrap .form-control {
   flex: 1;
   min-width: 180px;
}

.btn-group {
   display: flex;
   gap: 10px;
   margin-top: 1.5rem;
   flex-wrap: wrap;
}

.btn {
   display: inline-block;
   padding: 0.75rem 1.5rem;
   background: var(--primary);
   color: var(--white);
   border: none;
   border-radius: var(--radius);
   font-size: 1rem;
   font-weight: 600;
   cursor: pointer;
   transition: background-color 0.3s, transform 0.2s;
   text-decoration: none;
}

.btn:hover {
   background: var(--primary-dark);
   transform: translateY(-2px);
}

.btn:disabled {
   cursor: not-allowed;
   opacity: 0.7;
}

.btn-secondary {
   background: var(--secondary);
}

.btn-secondary:hover {
   background: #059669;
}

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

.btn-danger:hover {
   background: #dc2626;
}

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

.feedback-message {
   margin-top: 1rem;
   padding: 0.75rem 1rem;
   border-radius: var(--radius);
   font-weight: 500;
}

.feedback-message.feedback-error {
   background: #fef2f2;
   color: #991b1b;
   border: 1px solid #fecaca;
}

.feedback-message.feedback-success {
   background: #ecfdf5;
   color: #065f46;
   border: 1px solid #a7f3d0;
}

.duplicate-loading {
   margin-top: 1rem;
   text-align: center;
   padding: 2rem;
}

.duplicate-loading .spinner {
   width: 40px;
   height: 40px;
   border: 3px solid var(--border-color);
   border-top-color: var(--primary);
   border-radius: 50%;
   animation: spin 0.8s linear infinite;
   margin: 0 auto 1rem;
}

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

.duplicate-results.feedback-container {
   margin-top: 2rem;
   padding-top: 1.5rem;
   border-top: 1px solid var(--border-color);
}

.duplicate-results h3 {
   margin-bottom: 0.5rem;
   color: var(--text-primary);
}

.output-desc {
   color: var(--text-secondary);
   margin-bottom: 1rem;
   font-size: 0.95rem;
}

.duplicate-result-box {
   background: var(--bg-light);
   border: 1px solid var(--border-color);
   border-radius: var(--radius);
   padding: 1.5rem;
   margin-top: 0.5rem;
}

.similarity-gauge {
   text-align: center;
   margin-bottom: 1.5rem;
}

.gauge-value {
   font-size: 2.5rem;
   font-weight: 800;
   color: var(--primary);
   margin-bottom: 0.5rem;
}

.gauge-bar-wrap {
   height: 12px;
   background: #e2e8f0;
   border-radius: 6px;
   overflow: hidden;
   margin: 0.5rem 0 0.25rem;
   max-width: 400px;
   margin-left: auto;
   margin-right: auto;
}

.gauge-bar {
   height: 100%;
   border-radius: 6px;
   transition: width 0.5s ease;
}

.gauge-bar.gauge-high {
   background: var(--danger);
}

.gauge-bar.gauge-medium {
   background: var(--warning);
}

.gauge-bar.gauge-low {
   background: #3b82f6;
}

.gauge-bar.gauge-very-low {
   background: var(--secondary);
}

.gauge-label {
   font-size: 0.9rem;
   color: var(--text-muted);
   margin: 0;
}

.similarity-details {
   margin-bottom: 1rem;
   font-size: 0.9rem;
   color: var(--text-secondary);
}

.similarity-details p {
   margin: 0.25rem 0;
}

.similarity-interpretation {
   padding: 1rem 1.25rem;
   border-radius: var(--radius);
   font-size: 0.95rem;
   line-height: 1.5;
}

.similarity-interpretation.interp-high {
   background: #fef2f2;
   border-left: 4px solid var(--danger);
   color: #991b1b;
}

.similarity-interpretation.interp-medium {
   background: #fffbeb;
   border-left: 4px solid var(--warning);
   color: #92400e;
}

.similarity-interpretation.interp-low {
   background: #eff6ff;
   border-left: 4px solid #3b82f6;
   color: var(--text-primary);
}

.similarity-interpretation.interp-very-low {
   background: #ecfdf5;
   border-left: 4px solid var(--secondary);
   color: #065f46;
}

.duplicate-empty {
   color: var(--text-secondary);
   font-style: italic;
   margin: 0;
}

.features {
   display: grid;
   grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
   gap: 2rem;
   margin: 3rem 0;
}

.feature-card {
   background: var(--white);
   border-radius: var(--radius);
   padding: 2rem;
   box-shadow: var(--shadow);
   transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
   transform: translateY(-5px);
   box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
}

.feature-card i {
   font-size: 2.5rem;
   color: var(--primary);
   margin-bottom: 1rem;
}

.feature-card h3 {
   font-size: 1.4rem;
   margin-bottom: 1rem;
   color: var(--text-primary);
}

.feature-card p {
   color: var(--text-secondary);
   line-height: 1.6;
   margin: 0;
}

.info-section {
   width: 100%;
   padding: 80px 0;
   margin: 0;
}

.info-section .section-title {
   font-size: 2rem;
   font-weight: 800;
   margin-bottom: 2rem;
   color: var(--text-primary);
   text-align: center;
}

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

.step-card {
   background: var(--white);
   border-radius: var(--radius);
   padding: 1.5rem;
   box-shadow: var(--shadow);
   position: relative;
}

.step-number {
   position: absolute;
   top: -15px;
   left: -15px;
   width: 40px;
   height: 40px;
   background: var(--primary);
   color: var(--white);
   border-radius: 50%;
   display: flex;
   align-items: center;
   justify-content: center;
   font-weight: bold;
   font-size: 1.2rem;
   box-shadow: var(--shadow);
}

.step-card h3 {
   margin: 0.5rem 0 1rem;
   color: var(--text-primary);
}

.step-card p {
   color: var(--text-secondary);
   line-height: 1.6;
   margin: 0;
}

@media (max-width: 900px) {
   .duplicate-columns {
      grid-template-columns: 1fr;
   }
}

@media (max-width: 640px) {
   .url-input-wrap {
      flex-direction: column;
   }

   .url-input-wrap .form-control {
      min-width: 0;
   }

   .gauge-value {
      font-size: 2rem;
   }
}