:root {
    --ptc-primary: #0ea5e9;
    --ptc-primary-foreground: #f0f9ff;
    --ptc-bg: #f8fafc;
    --ptc-card: #ffffff;
    --ptc-text: #0f172a;
    --ptc-text-muted: #64748b;
    --ptc-border: #e2e8f0;
    --ptc-radius: 0.75rem;
}

.ptc-container {
    font-family: 'Inter', system-ui, sans-serif;
    max-width: 800px;
    margin: 0 auto;
    color: var(--ptc-text);
    padding: 1rem;
    box-sizing: border-box;
}

.ptc-container * {
    box-sizing: border-box;
}

.ptc-header {
    text-align: center;
    margin-bottom: 2rem;
}

.ptc-header h2 {
    font-size: 2rem;
    font-weight: 700;
    margin: 0 0 0.5rem 0;
    color: var(--ptc-text);
}

.ptc-header p {
    color: var(--ptc-text-muted);
    margin: 0;
}

.ptc-card {
    background: var(--ptc-card);
    border: 1px solid var(--ptc-border);
    border-radius: var(--ptc-radius);
    padding: 1.5rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    margin-bottom: 1.5rem;
}

.ptc-main-card {
    border: 1px solid rgba(14, 165, 233, 0.2);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05);
}

.ptc-controls {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

@media (max-width: 600px) {
    .ptc-controls {
        flex-direction: column;
        align-items: stretch;
    }
}

.ptc-group {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.ptc-group label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
    color: var(--ptc-text-muted);
}

.ptc-input-row {
    display: flex;
    gap: 0.5rem;
}

.ptc-input-row input,
.ptc-input-row select,
.ptc-result-display {
    height: 3.5rem;
    padding: 0 1rem;
    border: 1px solid var(--ptc-border);
    border-radius: 0.5rem;
    font-size: 1.25rem;
    background: #fff;
    color: var(--ptc-text);
}

.ptc-input-row input:focus,
.ptc-input-row select:focus {
    outline: 2px solid var(--ptc-primary);
    border-color: var(--ptc-primary);
}

.ptc-input-row input {
    flex: 1;
    font-family: monospace;
    width: 100%;
}

.ptc-input-row select {
    width: 80px;
    background-color: #f8fafc;
    cursor: pointer;
}

.ptc-result-display {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(14, 165, 233, 0.05);
    border-color: rgba(14, 165, 233, 0.2);
    color: var(--ptc-primary);
    font-weight: 600;
    font-family: monospace;
    overflow: hidden;
}

.ptc-icon-btn {
    background: transparent;
    border: 1px dashed var(--ptc-border);
    color: var(--ptc-primary);
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    margin: 1.5rem 0 0 0;
}

@media (max-width: 600px) {
    .ptc-icon-btn {
        margin: 0 auto;
        transform: rotate(90deg);
    }
}

.ptc-icon-btn:hover {
    background: rgba(14, 165, 233, 0.1);
    border-color: var(--ptc-primary);
}

.ptc-copy-btn {
    background: none;
    border: none;
    cursor: pointer;
    opacity: 0.5;
    transition: opacity 0.2s;
}

.ptc-copy-btn:hover {
    opacity: 1;
}

.ptc-divider {
    border: none;
    border-top: 1px solid var(--ptc-border);
    margin: 1.5rem 0;
}

.ptc-formula-box {
    background: #f1f5f9;
    padding: 1rem;
    border-radius: 0.5rem;
    text-align: center;
    border: 1px solid var(--ptc-border);
}

.ptc-label-small {
    display: block;
    font-size: 0.7rem;
    text-transform: uppercase;
    color: var(--ptc-text-muted);
    margin-bottom: 0.25rem;
    font-weight: 600;
}

.ptc-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

@media (max-width: 768px) {
    .ptc-grid {
        grid-template-columns: 1fr;
    }
}

.ptc-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.ptc-table th {
    text-align: left;
    padding: 0.5rem;
    border-bottom: 1px solid var(--ptc-border);
    color: var(--ptc-text-muted);
}

.ptc-table td {
    padding: 0.5rem;
    border-bottom: 1px solid #f1f5f9;
    font-family: monospace;
}

.ptc-highlight-card {
    background: var(--ptc-primary);
    color: var(--ptc-primary-foreground);
    border: none;
}

.ptc-highlight-card h3, .ptc-highlight-card p {
    color: var(--ptc-primary-foreground);
}

.ptc-tag {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.8rem;
    font-weight: 600;
    margin-top: 1rem;
}