.calculator-shell {
    max-width: 1040px;
    margin: 42px auto 0;
}

.calculator-card {
    overflow: hidden;
    border: 1px solid var(--border-light);
    border-radius: 28px;
    background: var(--bg-white);
    box-shadow: 0 24px 60px rgba(15, 23, 42, 0.09);
}

.calculator-tabs {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
    padding: 10px;
    background: var(--bg-soft);
    border-bottom: 1px solid var(--border-light);
}

.calculator-tab {
    min-height: 52px;
    padding: 10px 16px;
    border: 0;
    border-radius: 15px;
    background: transparent;
    color: var(--text-main);
    font: 700 0.94rem/1.25 var(--font-body);
    cursor: pointer;
    transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.calculator-tab:hover {
    transform: translateY(-1px);
}

.calculator-tab[aria-selected="true"] {
    background: var(--brand-blue);
    color: #fff;
    box-shadow: 0 8px 20px rgba(36, 62, 149, 0.2);
}

.calculator-body {
    display: grid;
    grid-template-columns: minmax(0, 0.9fr) minmax(340px, 1.1fr);
    min-height: 470px;
}

.calculator-form {
    padding: 38px;
    border-right: 1px solid var(--border-light);
}

.calculator-results {
    padding: 38px;
    background: var(--bg-soft);
}

.calculator-panel[hidden],
.calculator-results[hidden] {
    display: none;
}

.field-stack,
.calculator-settings {
    display: grid;
    gap: 18px;
}

.calculator-settings {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin: 28px 0;
}

.calculator-label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-heading);
    font-weight: 700;
}

.calculator-help {
    display: block;
    margin-top: 7px;
    color: var(--text-muted);
    font-size: 0.82rem;
    line-height: 1.45;
}

.calculator-input,
.calculator-select {
    width: 100%;
    min-height: 50px;
    padding: 11px 14px;
    border: 1px solid var(--border-light);
    border-radius: 12px;
    background: var(--bg-white);
    color: var(--text-heading);
    font: 600 1rem/1 var(--font-body);
}

.calculator-input[type="time"] {
    font-size: 1.35rem;
    color: var(--brand-blue);
}

.calculator-input:focus,
.calculator-select:focus,
.calculator-tab:focus-visible,
.result-diary-button:focus-visible {
    outline: 3px solid rgba(59, 130, 246, 0.35);
    outline-offset: 2px;
}

.calculator-submit {
    width: 100%;
    border: 0;
}

.calculator-intro-state {
    display: grid;
    min-height: 320px;
    place-items: center;
    text-align: center;
    color: var(--text-muted);
}

.calculator-intro-icon {
    display: grid;
    width: 72px;
    height: 72px;
    margin: 0 auto 18px;
    place-items: center;
    border-radius: 22px;
    background: var(--brand-light);
    color: var(--brand-blue);
    font-size: 2rem;
}

.results-heading {
    margin-bottom: 6px;
    font-size: 1.55rem;
}

.results-summary {
    margin-bottom: 22px;
    color: var(--text-muted);
}

.results-grid {
    display: grid;
    gap: 12px;
}

.result-card {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    gap: 14px;
    align-items: center;
    padding: 16px;
    border: 1px solid var(--border-light);
    border-radius: 16px;
    background: var(--bg-white);
}

.result-card.is-favorable {
    border-color: rgba(16, 185, 129, 0.5);
    box-shadow: inset 4px 0 0 #10b981;
}

.result-time {
    min-width: 76px;
    color: var(--brand-blue);
    font: 700 1.55rem/1 var(--font-heading);
}

.result-meta {
    min-width: 0;
}

.result-status {
    display: inline-flex;
    margin-bottom: 4px;
    padding: 3px 8px;
    border-radius: 999px;
    background: var(--brand-light);
    color: var(--brand-blue);
    font-size: 0.74rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.result-detail {
    color: var(--text-muted);
    font-size: 0.87rem;
}

.result-diary-button {
    min-height: 42px;
    padding: 9px 13px;
    border: 1px solid var(--brand-blue);
    border-radius: 999px;
    background: transparent;
    color: var(--brand-blue);
    font: 700 0.82rem/1.1 var(--font-body);
    cursor: pointer;
}

.result-diary-button:hover {
    background: var(--brand-blue);
    color: #fff;
}

.calculator-disclaimer {
    margin-top: 18px;
    color: var(--text-muted);
    font-size: 0.82rem;
    line-height: 1.55;
}

.calculator-content {
    max-width: 900px;
    margin: 70px auto 0;
}

.calculator-content h2 {
    margin: 44px 0 14px;
    font-size: clamp(1.55rem, 3vw, 2rem);
}

.calculator-content h3 {
    margin: 28px 0 8px;
    font-size: 1.2rem;
}

.calculator-content p,
.calculator-content li {
    color: var(--text-main);
}

.calculator-content ul {
    display: grid;
    gap: 10px;
    margin: 18px 0;
    padding-left: 22px;
    list-style: disc;
}

.calculator-source-note {
    margin-top: 30px;
    padding: 22px;
    border-left: 4px solid var(--brand-blue);
    border-radius: 0 14px 14px 0;
    background: var(--bg-soft);
    color: var(--text-muted);
}

.calculator-source-note a {
    color: var(--brand-blue);
    font-weight: 700;
    text-decoration: underline;
    text-underline-offset: 3px;
}

.calculator-faq details {
    padding: 18px 0;
    border-bottom: 1px solid var(--border-light);
}

.calculator-faq summary {
    color: var(--text-heading);
    font-weight: 700;
    cursor: pointer;
}

.calculator-faq details p {
    margin-top: 10px;
    color: var(--text-muted);
}

[data-theme="dark"] .calculator-card,
[data-theme="dark"] .calculator-input,
[data-theme="dark"] .calculator-select,
[data-theme="dark"] .result-card {
    background: var(--bg-white);
}

@media (max-width: 820px) {
    .calculator-body {
        grid-template-columns: 1fr;
    }

    .calculator-form {
        border-right: 0;
        border-bottom: 1px solid var(--border-light);
    }
}

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

    .calculator-form,
    .calculator-results {
        padding: 24px 18px;
    }

    .calculator-settings {
        grid-template-columns: 1fr;
    }

    .result-card {
        grid-template-columns: 1fr auto;
    }

    .result-time {
        grid-column: 1 / -1;
    }
}