/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

/* Container and layout */
.container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
    color: white;
    text-align: center;
    padding: 2rem;
}

header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

main {
    padding: 2rem;
}

/* Input section */
.input-section {
    margin-bottom: 2rem;
}

.input-section h2 {
    color: #4f46e5;
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.instructions {
    background: #f8fafc;
    padding: 1rem;
    border-left: 4px solid #4f46e5;
    border-radius: 0 8px 8px 0;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

/* URL Input Container */
#urlInputsContainer {
    margin-bottom: 1rem;
}

.url-input-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    padding: 0.5rem;
    background: #f8fafc;
    border-radius: 8px;
    border: 1px solid #e5e7eb;
    transition: all 0.3s ease;
}

.url-input-row:hover {
    background: #f1f5f9;
    border-color: #cbd5e1;
}

.url-input-row.valid {
    background: #f0fdf4;
    border-color: #bbf7d0;
}

.url-input-row.invalid {
    background: #fef2f2;
    border-color: #fecaca;
}

.url-checkbox {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: #4f46e5;
    flex-shrink: 0;
}

.url-input {
    flex: 1;
    padding: 0.75rem;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    font-size: 0.9rem;
    font-family: 'Courier New', monospace;
    background: white;
    transition: border-color 0.3s ease;
}

.url-input:focus {
    outline: none;
    border-color: #4f46e5;
    box-shadow: 0 0 0 2px rgba(79, 70, 229, 0.1);
}

.url-input.valid {
    border-color: #10b981;
}

.url-input.invalid {
    border-color: #ef4444;
}

.url-input::placeholder {
    color: #9ca3af;
    font-style: italic;
}

.remove-input-btn {
    background: #ef4444;
    color: white;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.remove-input-btn:hover {
    background: #dc2626;
    transform: scale(1.1);
}

.game-status {
    font-size: 0.8rem;
    color: #6b7280;
    min-width: 80px;
    text-align: center;
    flex-shrink: 0;
}

.game-status.valid {
    color: #10b981;
    font-weight: 600;
}

.game-status.invalid {
    color: #ef4444;
    font-weight: 600;
}

/* Controls section */
.controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.controls button {
    flex: 1;
    min-width: 140px;
    font-size: 0.9rem;
    padding: 0.6rem 1rem;
}

#addInputBtn {
    background: linear-gradient(135deg, #0ea5e9 0%, #0284c7 100%);
}

#addInputBtn:hover {
    box-shadow: 0 5px 15px rgba(14, 165, 233, 0.4);
}

#clearAllBtn {
    background: linear-gradient(135deg, #6b7280 0%, #4b5563 100%);
}

#clearAllBtn:hover {
    box-shadow: 0 5px 15px rgba(107, 114, 128, 0.4);
}

/* Buttons */
button {
    background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-block;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(79, 70, 229, 0.4);
}

button:active {
    transform: translateY(0);
}

#generateBtn {
    width: 100%;
    font-size: 1.1rem;
    padding: 1rem;
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
}

#generateBtn:hover {
    box-shadow: 0 5px 15px rgba(16, 185, 129, 0.4);
}

/* Output section */
.output-section {
    margin-bottom: 2rem;
}

.output-section h2 {
    color: #059669;
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.result-container {
    background: #f0fdf4;
    padding: 1.5rem;
    border-radius: 10px;
    border: 2px solid #bbf7d0;
    margin-bottom: 1rem;
}

.link-display {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.link-display input {
    flex: 1;
    padding: 0.75rem;
    border: 2px solid #d1d5db;
    border-radius: 6px;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    background: white;
}

.link-display button {
    background: linear-gradient(135deg, #0ea5e9 0%, #0284c7 100%);
    white-space: nowrap;
}

.link-display button:hover {
    box-shadow: 0 5px 15px rgba(14, 165, 233, 0.4);
}

.success-message {
    color: #059669;
    font-weight: 600;
    text-align: center;
    background: #dcfce7;
    padding: 0.5rem;
    border-radius: 6px;
    animation: fadeIn 0.3s ease;
}

.game-info {
    margin-top: 1rem;
    font-size: 0.9rem;
    color: #374151;
}

.game-info strong {
    color: #059669;
}

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

.actions button {
    flex: 1;
    min-width: 150px;
}

#openBtn {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
}

#openBtn:hover {
    box-shadow: 0 5px 15px rgba(245, 158, 11, 0.4);
}

#clearBtn {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
}

#clearBtn:hover {
    box-shadow: 0 5px 15px rgba(239, 68, 68, 0.4);
}

/* Error section */
.error-section {
    background: #fef2f2;
    border: 2px solid #fecaca;
    border-radius: 10px;
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.error-section h3 {
    color: #dc2626;
    margin-bottom: 0.5rem;
}

.error-section p {
    color: #7f1d1d;
}

/* Footer */
footer {
    background: #f8fafc;
    padding: 2rem;
    border-top: 1px solid #e5e7eb;
}

.info-section h3 {
    color: #4f46e5;
    margin-bottom: 1rem;
}

.info-section ol {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

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

.note {
    background: #fff7ed;
    border: 1px solid #fed7aa;
    border-radius: 6px;
    padding: 1rem;
    color: #9a3412;
    font-size: 0.9rem;
}

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

/* Responsive design */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    header {
        padding: 1.5rem;
    }
    
    header h1 {
        font-size: 1.6rem;
    }
    
    main {
        padding: 1.5rem;
    }
    
    .url-input-row {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
        padding: 0.75rem;
    }
    
    .url-checkbox {
        align-self: flex-start;
    }
    
    .game-status {
        text-align: left;
        min-width: auto;
    }
    
    .controls {
        flex-direction: column;
    }
    
    .controls button {
        min-width: auto;
    }
    
    .link-display {
        flex-direction: column;
    }
    
    .actions {
        flex-direction: column;
    }
    
    .actions button {
        min-width: auto;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.4rem;
    }
    
    .input-section h2,
    .output-section h2 {
        font-size: 1.3rem;
    }
    
    main {
        padding: 1rem;
    }
    
    footer {
        padding: 1.5rem;
    }
}