/* Advanced Percentage Calculator - Responsive & Lightweight */
.pcalc-container {
    max-width: 500px;
    margin: 20px auto;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
}

.pcalc-card {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    padding: 24px;
    position: relative;
    overflow: hidden;
}

.pcalc-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--pcalc-theme-color, #f8f9fa);
}

.pcalc-title {
    margin: 0 0 24px;
    font-size: 1.5rem;
    font-weight: 600;
    color: #1a1a1a;
    text-align: center;
}

.pcalc-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 24px;
    border-bottom: 2px solid #eee;
}

.pcalc-tab {
    flex: 1;
    padding: 12px 16px;
    background: none;
    border: none;
    font-size: 0.95rem;
    font-weight: 500;
    color: #666;
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: all 0.2s ease;
    border-radius: 8px 8px 0 0;
}

.pcalc-tab:hover {
    color: #007cba;
    background: #f8f9fa;
}

.pcalc-tab.active {
    color: var(--pcalc-button-color, #007cba);
    border-bottom-color: var(--pcalc-button-color, #007cba);
    background: #fff;
}

.pcalc-tab-panels {
    min-height: 200px;
}

.pcalc-panel {
    display: none;
    animation: fadeIn 0.3s ease;
}

.pcalc-panel.active {
    display: block;
}

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

.pcalc-input-group {
    margin-bottom: 20px;
}

.pcalc-input-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    color: #333;
    font-size: 0.95rem;
}

.pcalc-input-group input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.2s ease;
    box-sizing: border-box;
}

.pcalc-input-group input:focus {
    outline: none;
    border-color: var(--pcalc-button-color, #007cba);
    box-shadow: 0 0 0 3px rgba(0,124,186,0.1);
}

.pcalc-btn {
    width: 100%;
    padding: 14px 24px;
    background: var(--pcalc-button-color, #007cba);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-bottom: 16px;
}

.pcalc-btn:hover:not(:disabled) {
    background: color-mix(in srgb, var(--pcalc-button-color, #007cba), black 10%);
    transform: translateY(-1px);
}

.pcalc-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.pcalc-result {
    background: var(--pcalc-theme-color, #f8f9fa);
    padding: 16px 20px;
    border-radius: 8px;
    border-left: 4px solid var(--pcalc-button-color, #007cba);
    font-size: 1.1rem;
    font-weight: 600;
    color: #1a1a1a;
    min-height: 24px;
}

.pcalc-loader {
    display: none;
    text-align: center;
    padding: 20px;
    color: #666;
}

.pcalc-loader.active {
    display: block;
}

.pcalc-loader::after {
    content: '';
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid #eee;
    border-top: 2px solid var(--pcalc-button-color, #007cba);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-left: 10px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.pcalc-error {
    display: none;
    background: #fee;
    color: #c33;
    padding: 12px 16px;
    border-radius: 8px;
    border-left: 4px solid #c33;
    margin-top: 12px;
}

.pcalc-error.show {
    display: block;
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

/* Responsive Design */
@media (max-width: 768px) {
    .pcalc-container {
        margin: 10px;
        padding: 0 10px;
    }
    
    .pcalc-card {
        padding: 20px;
    }
    
    .pcalc-tabs {
        flex-direction: column;
    }
    
    .pcalc-tab {
        border-radius: 8px;
        margin-bottom: 4px;
    }
}

@media (max-width: 480px) {
    .pcalc-title {
        font-size: 1.3rem;
    }
    
    .pcalc-card {
        padding: 16px;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .pcalc-card {
        border: 2px solid #000;
    }
    
    .pcalc-input-group input {
        border-width: 3px;
    }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}