/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem 0;
}

.header-content {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
    padding: 2.5rem;
    border-radius: 20px;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-color);
}

.title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.title-icon {
    width: 40px;
    height: 40px;
    color: var(--primary-color);
}

.subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* Card */
.card {
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

/* Section Title */
.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.section-icon {
    width: 24px;
    height: 24px;
    color: var(--primary-color);
}

.section-icon.success {
    color: var(--success-color);
}

.section-title.error {
    color: var(--error-color);
}

/* Problem Input */
.problem-input {
    width: 100%;
    padding: 1rem;
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: 'Inter', monospace;
    resize: vertical;
    transition: border-color 0.3s, box-shadow 0.3s;
}

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

/* Controls */
.controls {
    margin-top: 1.5rem;
}

.control-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.control-group.full-width {
    margin-bottom: 1.5rem;
}

.control-label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.label-icon {
    width: 16px;
    height: 16px;
    color: var(--primary-light);
}

.control-select,
.control-input {
    padding: 0.75rem 1rem;
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: border-color 0.3s, box-shadow 0.3s;
}

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

/* Solve Button */
.solve-button {
    width: 100%;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    box-shadow: var(--shadow-md);
}

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

.solve-button:active:not(:disabled) {
    transform: translateY(0);
}

.solve-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.button-icon {
    width: 20px;
    height: 20px;
}

/* Status Section */
.status-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.25rem;
    background: var(--bg-tertiary);
    border-radius: 25px;
    font-size: 0.95rem;
    font-weight: 500;
}

.spinner {
    width: 20px;
    height: 20px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.progress-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.info-item {
    padding: 1rem;
    background: var(--bg-tertiary);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.info-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

.info-value {
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 600;
}

/* Log Section */
.log-output {
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    max-height: 400px;
    overflow-y: auto;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

.log-output::-webkit-scrollbar {
    width: 8px;
}

.log-output::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: 4px;
}

.log-output::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.log-output::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}

.log-line {
    padding: 0.25rem 0;
    word-wrap: break-word;
}

.log-line.success {
    color: var(--success-color);
    font-weight: 500;
}

.log-line.error {
    color: var(--error-color);
}

.log-line.warning {
    color: var(--warning-color);
}

/* Solution Section */
.solution-output {
    background: var(--bg-primary);
    border: 2px solid var(--success-color);
    border-radius: 8px;
    padding: 1.5rem;
    max-height: 600px;
    overflow-y: auto;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.8;
    color: var(--text-primary);
    white-space: pre-wrap;
    word-wrap: break-word;
}

.solution-footer {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.log-path {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-family: 'Monaco', 'Courier New', monospace;
}

/* Error Section */
.error-output {
    background: var(--bg-primary);
    border: 2px solid var(--error-color);
    border-radius: 8px;
    padding: 1.5rem;
    color: var(--error-color);
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 0.9rem;
}

/* Footer */
.footer {
    text-align: center;
    padding: 2rem 0;
    color: var(--text-muted);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
    margin-top: 3rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    .title {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .card {
        padding: 1.5rem;
    }

    .control-row {
        grid-template-columns: 1fr;
    }

    .status-header {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* Animation for cards appearing */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card {
    animation: fadeInUp 0.5s ease-out;
}