/* ============================================================
   UNIT CONVERSIONS — SHARED STYLES
   Used by: age calculator, BMI calculator, kg→pound, results
   ============================================================ */

/* ============================================================
   ROOT / PAGE
============================================================ */

.unit-page {
    --u-navy: #0F1B2E;
    --u-teal: #1B8392;
    --u-teal-dark: #14606C;
    --u-teal-tint: #E5F4F5;
    --u-ink: #1B2430;
    --u-muted: #5B6773;
    --u-line: #E1E8EA;
    --u-bg-soft: #F5F8F9;
    --u-success: #16a34a;
    --u-success-dark: #15803d;
    --u-error-bg: #fef2f2;
    --u-error-line: #fecaca;
    --u-error-text: #b91c1c;

    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    padding: 48px 20px 70px;
    box-sizing: border-box;
    font-family: 'Inter', Arial, Helvetica, sans-serif;
    color: var(--u-ink);
}

.unit-page *,
.unit-page *::before,
.unit-page *::after {
    box-sizing: border-box;
}

.unit-page h1,
.unit-page h2,
.unit-page h3 {
    font-family: 'Space Grotesk', Arial, Helvetica, sans-serif;
    color: var(--u-navy);
}

/* ============================================================
   HERO / HEADER (used at top of every page)
============================================================ */

.unit-hero {
    text-align: center;
    margin-bottom: 32px;
}

.unit-hero h1 {
    margin: 0 0 12px;
    font-size: clamp(1.9rem, 4.5vw, 2.6rem);
    font-weight: 650;
    line-height: 1.2;
}

.unit-hero p {
    max-width: 620px;
    margin: 0 auto;
    color: var(--u-muted);
    font-size: 1.02rem;
    line-height: 1.65;
}

.unit-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 72px;
    height: 72px;
    margin: 0 auto 18px;
    border-radius: 18px;
    background: var(--u-teal-tint);
    font-size: 36px;
}

/* ============================================================
   MAIN CARD (form, calculator, result)
============================================================ */

.unit-card {
    background: #ffffff;
    border: 1px solid var(--u-line);
    border-radius: 20px;
    padding: 42px;
    box-shadow: 0 10px 35px rgba(15, 27, 46, 0.07);
    text-align: center;
}

.unit-card--soft {
    background: var(--u-bg-soft);
    box-shadow: none;
}

/* ============================================================
   FORM
============================================================ */

.unit-form {
    max-width: 420px;
    margin: 0 auto;
    text-align: left;
}

.unit-form p {
    margin: 0 0 18px;
}

.unit-form label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    font-size: 0.92rem;
    color: var(--u-navy);
}

.unit-form input,
.unit-form select {
    width: 100%;
    padding: 13px 15px;
    border: 1px solid var(--u-line);
    border-radius: 10px;
    background: var(--u-bg-soft);
    color: var(--u-ink);
    font-size: 0.98rem;
    font-family: 'Inter', Arial, sans-serif;
    transition:
        border-color 0.15s ease,
        background 0.15s ease,
        box-shadow 0.15s ease;
}

.unit-form input:focus,
.unit-form select:focus {
    outline: none;
    border-color: var(--u-teal);
    background: #ffffff;
    box-shadow: 0 0 0 3px rgba(27, 131, 146, 0.14);
}

/* ============================================================
   PRIMARY BUTTON
============================================================ */

.unit-button {
    display: block;
    width: 100%;
    max-width: 420px;
    margin: 10px auto 0;
    padding: 15px 20px;
    border: none;
    border-radius: 12px;
    background: var(--u-teal);
    color: #ffffff;
    font-family: 'Space Grotesk', Arial, sans-serif;
    font-size: 1.02rem;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 8px 20px rgba(27, 131, 146, 0.28);
    transition: background 0.2s ease, transform 0.2s ease;
}

.unit-button:hover {
    background: var(--u-teal-dark);
    transform: translateY(-1px);
}

.unit-button:disabled {
    opacity: 0.55;
    cursor: not-allowed;
    transform: none;
}

/* ============================================================
   FORM ERRORS
============================================================ */

.unit-form-errors {
    max-width: 420px;
    margin: 0 auto 18px;
    padding: 12px 15px;
    border-radius: 10px;
    background: var(--u-error-bg);
    border: 1px solid var(--u-error-line);
    color: var(--u-error-text);
    font-size: 0.9rem;
    text-align: left;
}

/* ============================================================
   RESULT DISPLAY (for result pages or inline results)
============================================================ */

.unit-result {
    max-width: 560px;
    margin: 0 auto;
    padding: 28px 20px;
    border: 1px solid rgba(27, 131, 146, 0.18);
    border-radius: 16px;
    background: var(--u-teal-tint);
    text-align: center;
}

.unit-result-label {
    margin-bottom: 10px;
    color: var(--u-teal-dark);
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.unit-result-value {
    margin: 0;
    color: var(--u-navy);
    font-family: 'Space Grotesk', Arial, sans-serif;
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: 700;
    line-height: 1.35;
}

.unit-result-value strong {
    color: var(--u-teal);
    font-size: 1.15em;
}

.unit-result-subtext {
    margin: 12px 0 0;
    color: var(--u-muted);
    font-size: 0.9rem;
}

/* ============================================================
   SECONDARY INFO BOX (e.g. date of birth box)
============================================================ */

.unit-info-box {
    max-width: 500px;
    margin: 20px auto 0;
    padding: 15px 18px;
    border: 1px solid var(--u-line);
    border-radius: 12px;
    background: var(--u-bg-soft);
    text-align: center;
}

.unit-info-label {
    display: block;
    margin-bottom: 4px;
    color: var(--u-muted);
    font-size: 0.82rem;
}

.unit-info-value {
    color: var(--u-navy);
    font-size: 0.98rem;
    font-weight: 650;
}

/* ============================================================
   ACTION BUTTONS (calculate again, back home)
============================================================ */

.unit-actions {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 28px;
}

.unit-actions a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 12px 22px;
    border-radius: 11px;
    text-decoration: none;
    font-family: 'Space Grotesk', Arial, sans-serif;
    font-size: 0.95rem;
    font-weight: 700;
    transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.unit-actions .btn-primary {
    background: var(--u-teal);
    color: #ffffff;
    box-shadow: 0 7px 18px rgba(27, 131, 146, 0.25);
}

.unit-actions .btn-primary:hover {
    background: var(--u-teal-dark);
    transform: translateY(-1px);
}

.unit-actions .btn-secondary {
    border: 1px solid var(--u-line);
    background: #ffffff;
    color: var(--u-navy);
}

.unit-actions .btn-secondary:hover {
    background: var(--u-bg-soft);
}

/* ============================================================
   INFORMATION SECTIONS (article grids, how-to, formulas)
============================================================ */

.unit-section {
    margin-top: 56px;
}

.unit-section > h2 {
    margin: 0 0 12px;
    font-size: clamp(1.4rem, 3.5vw, 1.85rem);
    font-weight: 650;
    text-align: left;
}

.unit-section > h2.text-center {
    text-align: center;
}

.unit-section-intro {
    margin: 0 0 24px;
    color: var(--u-muted);
    font-size: 0.96rem;
    line-height: 1.7;
}

.unit-section-intro.text-center {
    text-align: center;
    max-width: 650px;
    margin-left: auto;
    margin-right: auto;
}

/* ============================================================
   CARD GRID (3-column articles / info cards)
============================================================ */

.unit-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
    margin-top: 24px;
}

.unit-grid--2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.unit-card-item {
    padding: 24px;
    border: 1px solid var(--u-line);
    border-radius: 14px;
    background: #ffffff;
    text-align: left;
}

.unit-card-item h3 {
    margin: 0 0 10px;
    font-size: 1.05rem;
    color: var(--u-navy);
    line-height: 1.35;
}

.unit-card-item p {
    margin: 0;
    color: var(--u-muted);
    font-size: 0.9rem;
    line-height: 1.65;
}

/* ============================================================
   FORMULA BOX (for conversion formulas)
============================================================ */

.unit-formula {
    margin: 20px 0;
    padding: 18px;
    border-radius: 10px;
    background: var(--u-bg-soft);
    border: 1px solid var(--u-line);
    text-align: center;
    font-family: 'Space Grotesk', Arial, sans-serif;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--u-navy);
}

/* ============================================================
   DATA TABLE (for BMI ranges, conversions)
============================================================ */

.unit-table-wrapper {
    overflow-x: auto;
    margin-top: 20px;
}

.unit-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 480px;
}

.unit-table th,
.unit-table td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid var(--u-line);
    font-size: 0.95rem;
}

.unit-table th {
    background: var(--u-bg-soft);
    color: var(--u-navy);
    font-weight: 700;
    font-size: 0.88rem;
}

.unit-table tr:last-child td {
    border-bottom: none;
}

.unit-range-underweight { color: #ca8a04; font-weight: 700; }
.unit-range-normal      { color: #16a34a; font-weight: 700; }
.unit-range-overweight  { color: #ea580c; font-weight: 700; }
.unit-range-obesity     { color: #dc2626; font-weight: 700; }

/* ============================================================
   DISCLAIMER
============================================================ */

.unit-disclaimer {
    margin: 35px 0;
    padding: 20px 22px;
    border-left: 4px solid var(--u-muted);
    border-radius: 10px;
    background: var(--u-bg-soft);
    color: var(--u-muted);
    font-size: 0.9rem;
    line-height: 1.65;
}

.unit-disclaimer strong {
    color: var(--u-navy);
}

/* ============================================================
   FAQ
============================================================ */

.unit-faqs {
    margin-top: 56px;
}

.unit-faqs > h2 {
    margin: 0 0 24px;
    text-align: center;
    font-size: clamp(1.4rem, 3.4vw, 1.85rem);
    font-weight: 650;
    color: var(--u-navy);
}

.unit-faq-item {
    margin-bottom: 10px;
    border: 1px solid var(--u-line);
    border-radius: 11px;
    background: var(--u-bg-soft);
    overflow: hidden;
}

.unit-faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    padding: 17px 18px;
    cursor: pointer;
    color: var(--u-ink);
    font-size: 0.95rem;
    font-weight: 650;
    line-height: 1.45;
    user-select: none;
}

.unit-faq-question:hover {
    color: var(--u-teal-dark);
}

.unit-faq-icon {
    flex-shrink: 0;
    color: var(--u-teal);
    font-size: 20px;
    font-weight: 400;
    line-height: 1;
}

.unit-faq-answer {
    display: none;
    padding: 0 18px 18px;
    color: var(--u-muted);
    font-size: 0.88rem;
    line-height: 1.7;
}

.unit-faq-item.open .unit-faq-answer {
    display: block;
}

/* ============================================================
   RELATED TOOLS
============================================================ */

.unit-tools {
    margin-top: 56px;
    padding: 32px 24px;
    border-radius: 18px;
    background: var(--u-navy);
    text-align: center;
}

.unit-tools h2 {
    margin: 0 0 20px;
    color: #ffffff;
    font-size: 1.35rem;
    font-weight: 650;
}

.unit-tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 10px;
    max-width: 720px;
    margin: 0 auto;
}

.unit-tool-link {
    display: block;
    padding: 13px 16px;
    border-radius: 10px;
    background: #ffffff;
    color: var(--u-navy);
    text-decoration: none;
    font-weight: 700;
    font-size: 0.88rem;
    transition: transform 0.2s ease, background 0.2s ease;
}

.unit-tool-link:hover {
    background: var(--u-teal-tint);
    color: var(--u-teal-dark);
    transform: translateY(-2px);
}

/* ============================================================
   RESPONSIVE
============================================================ */

@media (max-width: 800px) {

    .unit-page {
        padding: 32px 14px 55px;
    }

    .unit-card {
        padding: 28px 18px;
        border-radius: 16px;
    }

    .unit-grid,
    .unit-grid--2 {
        grid-template-columns: 1fr;
    }

    .unit-tools {
        padding: 26px 18px;
    }

    .unit-tools-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 500px) {

    .unit-hero h1 {
        font-size: 1.75rem;
    }

    .unit-hero p {
        font-size: 0.95rem;
    }

    .unit-icon {
        width: 60px;
        height: 60px;
        font-size: 30px;
    }

    .unit-actions {
        flex-direction: column;
    }

    .unit-actions a {
        width: 100%;
    }

    .unit-tools-grid {
        grid-template-columns: 1fr;
    }
}