.ppi-calculator-grid {
    display: grid;
    grid-template-columns: minmax(0, 2fr) minmax(280px, 1fr);
    gap: 32px;
}

@media (max-width: 1024px) {
    .ppi-calculator-grid {
        grid-template-columns: 1fr;
    }
}

.ppi-calculator-card {
    background: #ffffff;
    border-radius: 16px;
    padding: 28px;
    box-shadow: 0 12px 32px rgba(15, 23, 42, 0.08);
    border: 1px solid rgba(15, 23, 42, 0.06);
    display: flex;
    flex-direction: column;
    gap: 24px;
}

@media (max-width: 640px) {
    .ppi-calculator-card {
        padding: 20px;
        border-radius: 12px;
    }
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
}

.card-header h2 {
    margin: 0;
    font-size: 1.5rem;
    color: #0f172a;
}

.card-subtitle {
    margin: 6px 0 0;
    color: #475569;
    font-size: 0.95rem;
    line-height: 1.5;
}

.card-actions {
    display: flex;
    gap: 12px;
}

.card-actions .btn-outline {
    border: 1px solid #2563eb;
    color: #2563eb;
    background: transparent;
}

.card-actions .btn-outline:hover,
.card-actions .btn-outline:focus {
    background: rgba(37, 99, 235, 0.08);
}

.ppi-form {
    display: grid;
    gap: 16px;
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

@media (max-width: 900px) {
    .ppi-form {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 640px) {
    .ppi-form {
        grid-template-columns: 1fr;
    }
}

.ppi-input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.ppi-input-group label {
    font-weight: 600;
    color: #1e293b;
}

.ppi-input-group input {
    border: 1px solid #cbd5f5;
    border-radius: 10px;
    padding: 12px 14px;
    font-size: 1rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.ppi-input-group input:focus {
    outline: none;
    border-color: #2563eb;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.ppi-error {
    margin: -8px 0 0;
    color: #dc2626;
    font-size: 0.92rem;
    min-height: 1.2rem;
}

.ppi-result-card {
    background: linear-gradient(135deg, #1f2937 0%, #111827 100%);
    color: #f8fafc;
    border-radius: 18px;
    padding: 26px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.ppi-result-main h3 {
    margin: 0 0 8px;
    font-size: 1.25rem;
    font-weight: 600;
}

.ppi-value {
    display: flex;
    align-items: baseline;
    gap: 12px;
    margin: 0;
    font-size: 2.8rem;
    font-weight: 700;
    letter-spacing: -0.04em;
}

.ppi-unit {
    font-size: 1rem;
    color: rgba(248, 250, 252, 0.7);
}

.ppi-grade {
    margin: 4px 0 0;
    font-size: 0.98rem;
    color: rgba(248, 250, 252, 0.8);
}

.ppi-metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 14px;
}

.metric-item {
    background: rgba(15, 23, 42, 0.35);
    border-radius: 12px;
    padding: 14px 16px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    border: 1px solid rgba(248, 250, 252, 0.08);
}

.metric-label {
    font-size: 0.85rem;
    color: rgba(248, 250, 252, 0.7);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.metric-value {
    font-size: 1.1rem;
    font-weight: 600;
}

.ppi-presets {
    background: #f8fafc;
    border: 1px solid rgba(148, 163, 184, 0.35);
    border-radius: 14px;
    padding: 22px 24px;
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.ppi-presets h3 {
    margin: 0;
    font-size: 1.2rem;
    color: #0f172a;
}

.preset-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
}

@media (max-width: 900px) {
    .preset-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 520px) {
    .preset-grid {
        grid-template-columns: 1fr;
    }
}

.preset-item {
    border: 1px solid rgba(148, 163, 184, 0.6);
    border-radius: 12px;
    padding: 16px;
    background: #ffffff;
    text-align: left;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.preset-item:hover,
.preset-item:focus {
    border-color: #2563eb;
    box-shadow: 0 12px 24px rgba(37, 99, 235, 0.12);
    transform: translateY(-2px);
}

.preset-title {
    display: block;
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 6px;
}

.preset-desc {
    display: block;
    font-size: 0.88rem;
    color: #64748b;
}

.ppi-knowledge-panel {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.knowledge-card {
    background: #0f172a;
    color: #e2e8f0;
    border-radius: 16px;
    padding: 22px 24px;
    box-shadow: inset 0 0 0 1px rgba(226, 232, 240, 0.08), 0 10px 30px rgba(15, 23, 42, 0.18);
    position: relative;
    overflow: hidden;
}

.knowledge-card::after {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(120% 120% at 0% 0%, rgba(59, 130, 246, 0.12), transparent 55%);
    pointer-events: none;
}

.knowledge-card h3 {
    margin: 0 0 10px;
    font-size: 1.2rem;
    color: #ffffff;
}

.knowledge-card p,
.knowledge-card li {
    color: rgba(226, 232, 240, 0.86);
    line-height: 1.6;
}

.knowledge-list {
    margin: 0;
    padding-left: 18px;
}

.knowledge-tags {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.knowledge-tags li {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.95rem;
}

.knowledge-tags .tag {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 4px 10px;
    border-radius: 999px;
    font-weight: 600;
    font-size: 0.82rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.tag.primary {
    background: rgba(59, 130, 246, 0.15);
    color: #60a5fa;
}

.tag.success {
    background: rgba(16, 185, 129, 0.18);
    color: #34d399;
}

.tag.warning {
    background: rgba(251, 191, 36, 0.18);
    color: #facc15;
}

.tag.neutral {
    background: rgba(148, 163, 184, 0.18);
    color: #cbd5f5;
}

.tag.muted {
    background: rgba(100, 116, 139, 0.25);
    color: rgba(226, 232, 240, 0.7);
}

.ppi-table-section,
.ppi-faq-section {
    margin-top: 48px;
}

.ppi-table-section h2,
.ppi-faq-section h2 {
    font-size: 1.6rem;
    color: #0f172a;
    margin-bottom: 20px;
}

.responsive-table {
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(15, 23, 42, 0.1);
}

.responsive-table table {
    width: 100%;
    border-collapse: collapse;
    background: #ffffff;
}

.responsive-table th,
.responsive-table td {
    padding: 18px 20px;
    text-align: left;
    border-bottom: 1px solid rgba(226, 232, 240, 0.6);
}

.responsive-table thead {
    background: #0f172a;
    color: #e2e8f0;
}

.responsive-table tbody tr:nth-child(even) {
    background: #f8fafc;
}

.table-note {
    margin-top: 14px;
    font-size: 0.95rem;
    color: #475569;
    line-height: 1.6;
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
}

@media (max-width: 1024px) {
    .faq-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 640px) {
    .faq-grid {
        grid-template-columns: 1fr;
    }
}

.faq-item {
    background: #ffffff;
    border-radius: 16px;
    padding: 20px 22px;
    box-shadow: 0 16px 36px rgba(15, 23, 42, 0.07);
    border: 1px solid rgba(148, 163, 184, 0.4);
}

.faq-item h3 {
    margin: 0 0 10px;
    font-size: 1.1rem;
    color: #0f172a;
}

.faq-item p {
    margin: 0;
    color: #475569;
    line-height: 1.65;
    font-size: 0.96rem;
}