/* =====================================================
           TOOL PAGE — scoped styles
           ===================================================== */

        .tool-page {
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        .tool-main {
            flex: 1;
            padding: 80px 0 80px;
        }

        /* Header */
        .tool-header {
            text-align: center;
            margin-bottom: 48px;
        }

        .tool-badge {
            display: inline-block;
            padding: 5px 14px;
            border-radius: var(--radius-full);
            font-size: 0.8rem;
            font-weight: 600;
            background: var(--color-text);
            color: var(--color-bg);
            margin-bottom: 16px;
            letter-spacing: 0.01em;
        }

        .tool-header h1 {
            font-family: var(--font-display);
            font-size: 3rem;
            font-weight: 900;
            letter-spacing: -0.035em;
            line-height: 1.08;
            color: var(--color-text);
            margin-bottom: 12px;
        }

        .tool-header p {
            font-size: 1.1rem;
            color: var(--color-text-secondary);
            max-width: 520px;
            margin: 0 auto;
            line-height: 1.65;
        }

        /* Calculator Card */
        .tool-calc-card {
            max-width: 520px;
            margin: 0 auto 64px;
            background: var(--color-bg);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: 40px;
            box-shadow: var(--shadow-elevated);
        }

        /* Gender Toggle */
        .tool-gender-toggle {
            display: flex;
            background: var(--color-surface);
            border-radius: var(--radius-full);
            padding: 4px;
            margin-bottom: 32px;
            border: 1px solid var(--color-border);
        }

        .tool-gender-btn {
            flex: 1;
            padding: 10px 0;
            text-align: center;
            font-family: var(--font-body);
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--color-text-secondary);
            background: transparent;
            border: none;
            border-radius: var(--radius-full);
            cursor: pointer;
            transition: all 0.25s ease;
        }

        .tool-gender-btn.active {
            background: var(--color-text);
            color: var(--color-bg);
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
        }

        /* Input groups */
        .tool-input-group {
            margin-bottom: 20px;
        }

        .tool-input-label {
            display: block;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--color-text);
            margin-bottom: 6px;
            letter-spacing: 0.01em;
        }

        .tool-input-hint {
            font-weight: 400;
            color: var(--color-text-tertiary);
            font-size: 0.8rem;
        }

        .tool-input-row {
            display: flex;
            gap: 10px;
        }

        .tool-input-row .tool-input-field {
            flex: 1;
        }

        .tool-input-field {
            width: 100%;
            padding: 12px 16px;
            font-family: var(--font-body);
            font-size: 1rem;
            font-weight: 500;
            color: var(--color-text);
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-sm);
            outline: none;
            transition: border-color 0.2s ease, box-shadow 0.2s ease;
            -moz-appearance: textfield;
            appearance: textfield;
        }

        .tool-input-field::-webkit-outer-spin-button,
        .tool-input-field::-webkit-inner-spin-button {
            -webkit-appearance: none;
            margin: 0;
        }

        .tool-input-field::placeholder {
            color: var(--color-text-tertiary);
            font-weight: 400;
        }

        .tool-input-field:focus {
            border-color: var(--color-text);
            box-shadow: 0 0 0 3px rgba(17, 17, 17, 0.06);
        }

        /* Unit toggle (sits next to inputs) */
        .tool-unit-toggle {
            display: inline-flex;
            background: var(--color-surface);
            border-radius: var(--radius-full);
            padding: 2px;
            border: 1px solid var(--color-border);
            margin-left: 8px;
            vertical-align: middle;
        }

        .tool-unit-btn {
            padding: 3px 10px;
            font-family: var(--font-body);
            font-size: 0.72rem;
            font-weight: 600;
            color: var(--color-text-tertiary);
            background: transparent;
            border: none;
            border-radius: var(--radius-full);
            cursor: pointer;
            transition: all 0.2s ease;
        }

        .tool-unit-btn.active {
            background: var(--color-bg);
            color: var(--color-text);
            box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
        }

        /* Calculate button */
        .tool-calc-btn {
            width: 100%;
            padding: 14px 0;
            font-family: var(--font-display);
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--color-bg);
            background: var(--color-text);
            border: none;
            border-radius: var(--radius-sm);
            cursor: pointer;
            transition: transform 0.2s ease, opacity 0.2s ease;
            margin-top: 12px;
        }

        .tool-calc-btn:hover {
            transform: translateY(-1px);
            opacity: 0.9;
        }

        .tool-calc-btn:active {
            transform: translateY(0);
        }

        /* --- Result Card --- */
        .tool-result {
            display: none;
            text-align: center;
            margin-top: 28px;
            padding-top: 28px;
            border-top: 1px solid var(--color-border);
            animation: toolFadeIn 0.5s ease;
        }

        .tool-result.show {
            display: block;
        }

        @keyframes toolFadeIn {
            from {
                opacity: 0;
                transform: translateY(12px);
            }

            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .tool-result-number {
            font-family: var(--font-display);
            font-size: 4.5rem;
            font-weight: 900;
            letter-spacing: -0.04em;
            line-height: 1;
            color: var(--color-text);
            margin-bottom: 4px;
        }

        .tool-result-unit {
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--color-text-secondary);
        }

        .tool-result-category {
            display: inline-block;
            padding: 5px 16px;
            border-radius: var(--radius-full);
            font-size: 0.85rem;
            font-weight: 700;
            margin-top: 8px;
            margin-bottom: 16px;
        }

        /* Category colors */
        .cat-essential {
            background: #fef3c7;
            color: #92400e;
        }

        .cat-athletic {
            background: #d1fae5;
            color: #065f46;
        }

        .cat-fitness {
            background: #dbeafe;
            color: #1e40af;
        }

        .cat-average {
            background: #e5e7eb;
            color: #374151;
        }

        .cat-above-average {
            background: #fee2e2;
            color: #991b1b;
        }

        /* Gauge bar */
        .tool-gauge {
            height: 10px;
            background: var(--color-surface);
            border-radius: var(--radius-full);
            overflow: hidden;
            margin-bottom: 10px;
            position: relative;
        }

        .tool-gauge-fill {
            height: 100%;
            border-radius: var(--radius-full);
            transition: width 0.8s cubic-bezier(0.22, 1, 0.36, 1);
            background: linear-gradient(90deg, #10b981, #3b82f6, #f59e0b, #ef4444);
        }

        .tool-gauge-labels {
            display: flex;
            justify-content: space-between;
            font-size: 0.7rem;
            color: var(--color-text-tertiary);
            font-weight: 500;
            margin-bottom: 16px;
        }

        .tool-result-detail {
            font-size: 0.92rem;
            color: var(--color-text-secondary);
            line-height: 1.6;
            max-width: 380px;
            margin: 0 auto;
        }

        /* Lean mass stat */
        .tool-result-stats {
            display: flex;
            gap: 20px;
            justify-content: center;
            margin-top: 20px;
        }

        .tool-stat {
            text-align: center;
        }

        .tool-stat-value {
            font-family: var(--font-display);
            font-size: 1.4rem;
            font-weight: 800;
            color: var(--color-text);
        }

        .tool-stat-label {
            font-size: 0.75rem;
            color: var(--color-text-tertiary);
            font-weight: 500;
        }

        /* =====================================================
           REFERENCE CHART
           ===================================================== */

        .tool-reference {
            max-width: 720px;
            margin: 0 auto 64px;
        }

        .tool-reference h2 {
            font-family: var(--font-display);
            font-size: 1.8rem;
            font-weight: 800;
            letter-spacing: -0.025em;
            color: var(--color-text);
            text-align: center;
            margin-bottom: 8px;
        }

        .tool-reference > p {
            text-align: center;
            color: var(--color-text-secondary);
            font-size: 0.95rem;
            margin-bottom: 32px;
        }

        .tool-ref-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 12px;
        }

        .tool-ref-card {
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 18px 20px;
            background: var(--color-bg);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            transition: transform 0.2s ease, box-shadow 0.2s ease;
        }

        .tool-ref-card:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-card);
        }

        .tool-ref-dot {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            flex-shrink: 0;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.7rem;
            font-weight: 800;
            font-family: var(--font-display);
            color: #fff;
        }

        .tool-ref-info h4 {
            font-family: var(--font-display);
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 2px;
        }

        .tool-ref-range {
            font-size: 0.82rem;
            font-weight: 600;
            color: var(--color-text-secondary);
        }

        .tool-ref-desc {
            font-size: 0.78rem;
            color: var(--color-text-tertiary);
            line-height: 1.45;
            margin-top: 2px;
        }

        /* Dot colors */
        .dot-essential { background: #f59e0b; }
        .dot-athletic  { background: #10b981; }
        .dot-fitness   { background: #3b82f6; }
        .dot-average   { background: #6b7280; }
        .dot-above     { background: #ef4444; }

        /* =====================================================
           CTA SECTION
           ===================================================== */

        .tool-cta-section {
            max-width: 620px;
            margin: 0 auto 0;
            text-align: center;
            padding: 48px 40px;
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--color-border);
        }

        .tool-cta-icon {
            width: 56px;
            height: 56px;
            margin: 0 auto 20px;
            border-radius: var(--radius-sm);
            background: var(--color-text);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .tool-cta-icon svg {
            width: 26px;
            height: 26px;
            color: #fff;
        }

        .tool-cta-section h2 {
            font-family: var(--font-display);
            font-size: 1.7rem;
            font-weight: 800;
            letter-spacing: -0.025em;
            color: var(--color-text);
            margin-bottom: 12px;
        }

        .tool-cta-section p {
            font-size: 1rem;
            color: var(--color-text-secondary);
            line-height: 1.7;
            max-width: 460px;
            margin: 0 auto 24px;
        }

        .tool-cta-list {
            list-style: none;
            display: inline-flex;
            flex-direction: column;
            gap: 6px;
            text-align: left;
            margin-bottom: 28px;
        }

        .tool-cta-list li {
            font-size: 0.92rem;
            color: var(--color-text-secondary);
            padding-left: 24px;
            position: relative;
        }

        .tool-cta-list li::before {
            content: "✓";
            position: absolute;
            left: 0;
            font-weight: 700;
            color: var(--color-text);
        }

        /* Method note */
        .tool-method-note {
            max-width: 520px;
            margin: 40px auto 0;
            padding: 24px;
            background: var(--color-surface);
            border-radius: var(--radius-md);
            border: 1px solid var(--color-border);
            text-align: center;
        }

        .tool-method-note h3 {
            font-family: var(--font-display);
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 6px;
        }

        .tool-method-note p {
            font-size: 0.82rem;
            color: var(--color-text-tertiary);
            line-height: 1.6;
        }

        /* Error state */
        .tool-input-error {
            border-color: #ef4444 !important;
        }

        .tool-error-msg {
            color: #ef4444;
            font-size: 0.8rem;
            font-weight: 500;
            margin-top: 8px;
            display: none;
        }

        .tool-error-msg.show {
            display: block;
        }

        /* Hip field toggle */
        .tool-hip-group {
            display: none;
        }

        .tool-hip-group.show {
            display: block;
        }

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

        @media (max-width: 640px) {
            .tool-main {
                padding: 80px 0 80px; /* extra bottom for floating CTA */
            }

            .tool-header {
                margin-bottom: 32px;
            }

            .tool-header h1 {
                font-size: 1.85rem;
            }

            .tool-header p {
                font-size: 0.95rem;
            }

            .tool-calc-card {
                padding: 24px 18px;
                margin: 0 auto 40px;
            }

            .tool-ref-grid {
                grid-template-columns: 1fr;
            }

            .tool-result-number {
                font-size: 3rem;
            }

            .tool-result-label {
                font-size: 1rem;
            }

            .tool-cta-section {
                padding: 28px 20px;
            }

            .tool-cta-section h2 {
                font-size: 1.3rem;
            }

            .tool-cta-section p {
                font-size: 0.92rem;
            }

            .tool-result-stats {
                gap: 12px;
                flex-wrap: wrap;
            }

            .tool-result-stat {
                min-width: 80px;
            }

            .tool-about {
                margin-bottom: 24px;
                padding-bottom: 80px; /* clear floating CTA */
            }

            .tool-ref-section {
                margin-bottom: 32px;
            }

            .tool-ref-card {
                padding: 20px;
            }

            /* Make gauge labels smaller on mobile */
            .tool-gauge-labels {
                font-size: 0.7rem;
            }
        }