:root {
    --calc-bg: #f1f5f9;
    --calc-card: #ffffff;
    --calc-alt: #f8fafc;
    --calc-border: #e2e8f0;
    --calc-text: #0f172a;
    --calc-muted: #64748b;
    --calc-primary: #2563eb;
    --calc-positive: #16a34a;
    --calc-warning: #d97706;
}

.dark-mode {
    --calc-bg: #0a0f1e;
    --calc-card: #141b2d;
    --calc-alt: #1a2336;
    --calc-border: #2a3650;
    --calc-text: #f1f5f9;
    --calc-muted: #94a3b8;
    --calc-primary: #60a5fa;
    --calc-positive: #4ade80;
    --calc-warning: #fbbf24;
}

.calculator-page {
    background: var(--calc-bg);
    color: var(--calc-text);
    min-height: calc(100vh - 112px);
    padding: 24px 0 40px;
    font-family: 'Inter', 'Poppins', sans-serif;
}

.calculator-shell {
    max-width: 1280px;
    margin: 0 auto;
}

.calculator-heading {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 20px;
}

.calculator-heading h1 {
    font-size: 1.7rem;
    font-weight: 800;
    margin: 0 0 5px;
    letter-spacing: -0.03em;
}

.calculator-heading p {
    color: var(--calc-muted);
    margin: 0;
    font-size: 0.88rem;
}

.calculator-brand {
    color: var(--calc-primary);
    font-size: 0.76rem;
    font-weight: 700;
    padding: 8px 12px;
    border: 1px solid var(--calc-border);
    border-radius: 20px;
    white-space: nowrap;
}

.calculator-grid {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 18px;
    align-items: start;
}

.calculator-card,
.result-card {
    background: var(--calc-card);
    border: 1px solid var(--calc-border);
    border-radius: 14px;
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.06);
}

.dark-mode .calculator-card,
.dark-mode .result-card {
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
}

.calculator-card {
    padding: 20px;
    position: sticky;
    top: 78px;
}

.calculator-card h2,
.result-card h2 {
    font-size: 1rem;
    font-weight: 750;
    margin: 0 0 18px;
}

.calc-field {
    margin-bottom: 14px;
}

.calc-field label {
    display: block;
    color: var(--calc-muted);
    font-size: 0.75rem;
    font-weight: 650;
    margin-bottom: 6px;
}

.calc-input,
.calc-select {
    width: 100%;
    padding: 11px 12px;
    border: 1px solid var(--calc-border);
    border-radius: 8px;
    background: var(--calc-alt);
    color: var(--calc-text);
    font: inherit;
    font-size: 0.88rem;
    outline: none;
}

.calc-input:focus,
.calc-select:focus {
    border-color: var(--calc-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.calc-button {
    width: 100%;
    border: 0;
    border-radius: 8px;
    padding: 12px;
    background: linear-gradient(135deg, var(--calc-primary), #1d4ed8);
    color: #ffffff;
    font-size: 0.88rem;
    font-weight: 700;
    cursor: pointer;
    margin-top: 5px;
}

.calc-button:hover { filter: brightness(1.08); }

.report-buttons {
    display: flex;
    gap: 8px;
    margin-top: 10px;
}

.report-button {
    flex: 1;
    padding: 9px 8px;
    border: 1px solid var(--calc-border);
    border-radius: 8px;
    background: var(--calc-alt);
    color: var(--calc-text);
    font-size: 0.76rem;
    font-weight: 650;
    cursor: pointer;
}

.report-button:hover {
    border-color: var(--calc-primary);
    color: var(--calc-primary);
}

.result-card {
    padding: 20px;
    min-height: 540px;
}

.result-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}

.result-card-header h2 { margin: 0; }

.report-date {
    color: var(--calc-muted);
    font-size: 0.72rem;
}

.result-summary {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 18px;
}

.summary-tile {
    padding: 14px;
    border-radius: 10px;
    background: var(--calc-alt);
    border: 1px solid var(--calc-border);
}

.summary-tile span {
    display: block;
    color: var(--calc-muted);
    font-size: 0.7rem;
    font-weight: 600;
    margin-bottom: 6px;
}

.summary-tile strong {
    color: var(--calc-text);
    font-size: 1.05rem;
    font-weight: 800;
}

.summary-tile.invested strong { color: var(--calc-primary); }
.summary-tile.interest strong { color: var(--calc-warning); }
.summary-tile.total strong { color: var(--calc-positive); }

.chart-panel {
    height: 210px;
    margin-bottom: 18px;
}

.schedule-heading {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.schedule-heading h3 {
    font-size: 0.88rem;
    font-weight: 750;
    margin: 0;
}

.schedule-heading span {
    color: var(--calc-muted);
    font-size: 0.72rem;
}

.schedule-wrapper {
    max-height: 300px;
    overflow: auto;
    border: 1px solid var(--calc-border);
    border-radius: 9px;
}

.schedule-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.76rem;
}

.schedule-table th {
    position: sticky;
    top: 0;
    z-index: 1;
    background: var(--calc-primary);
    color: #ffffff;
    padding: 9px 10px;
    text-align: right;
    font-weight: 700;
    white-space: nowrap;
}

.schedule-table th:first-child,
.schedule-table td:first-child { text-align: left; }

.schedule-table td {
    padding: 8px 10px;
    text-align: right;
    border-bottom: 1px solid var(--calc-border);
    color: var(--calc-text);
    white-space: nowrap;
}

.schedule-table tbody tr:nth-child(even) { background: var(--calc-alt); }
.schedule-table tbody tr:hover { background: rgba(37, 99, 235, 0.08); }

.calc-note {
    margin-top: 12px;
    color: var(--calc-muted);
    font-size: 0.7rem;
    line-height: 1.5;
}

@media (max-width: 900px) {
    .calculator-grid { grid-template-columns: 1fr; }
    .calculator-card { position: static; }
}

@media (max-width: 600px) {
    .calculator-heading { flex-direction: column; }
    .calculator-heading h1 { font-size: 1.4rem; }
    .result-summary { grid-template-columns: 1fr; }
    .calculator-page { padding: 16px 0 30px; }
}