/* ═══════════════════════════════════════════
   ENGINEERING TOOLBOX — toolbox.css
   Scoped under .toolbox-page
   ═══════════════════════════════════════════ */

/* ── PAGE LAYOUT ── */
.toolbox-page {
    padding-top: 80px;
}

.toolbox-hero {
    text-align: center;
    padding: 3rem 5% 1.5rem;
}

.toolbox-hero h1 {
    font-family: 'Orbitron', sans-serif;
    font-size: 2.2rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.toolbox-hero p {
    color: #a0aec0;
    max-width: 600px;
    margin: 0 auto;
    font-size: 1rem;
}

/* ── STICKY TAB BAR ── */
.toolbox-tabs {
    position: sticky;
    top: 60px; /* below fixed header */
    z-index: 8;
    background: rgba(26, 32, 44, 0.85);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 0.75rem 5%;
}

.tab-pills {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
    -webkit-overflow-scrolling: touch;
    padding: 0 4px;
    /* Subtle fade at edges to signal scrollable content */
    mask-image: linear-gradient(to right, transparent, black 12px, black calc(100% - 12px), transparent);
    -webkit-mask-image: linear-gradient(to right, transparent, black 12px, black calc(100% - 12px), transparent);
}

.tab-pills::-webkit-scrollbar {
    display: none;
}

.tab-pill {
    min-height: 44px;
    padding: 10px 18px;
    font-family: 'Poppins', sans-serif;
    font-size: 0.85rem;
    font-weight: 500;
    border: 1px solid var(--border-color);
    border-radius: 22px;
    cursor: pointer;
    color: #a0aec0;
    background: transparent;
    transition: all 0.15s ease;
    white-space: nowrap;
    flex-shrink: 0;
}

.tab-pill:hover {
    border-color: rgba(74, 144, 226, 0.5);
    color: var(--text-color);
}

.tab-pill[aria-selected="true"] {
    border-color: var(--accent-color);
    color: var(--accent-color);
    background: rgba(232, 154, 60, 0.08);
}

.tab-pill:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* ── TOOL PANELS ── */
.toolbox-panels {
    padding: 1.5rem 5% 4rem;
    max-width: 1400px;
    margin: 0 auto;
}

.tool-panel {
    display: none;
}

.tool-panel.active {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.25rem;
    align-content: start;
}

/* ── CARDS ── */
.tool-card {
    background: var(--card-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    backdrop-filter: blur(5px);
    display: flex;
    flex-direction: column;
    gap: 0.875rem;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.tool-card:hover {
    border-color: rgba(74, 144, 226, 0.5);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.tool-card.wide {
    grid-column: span 2;
}

.card-head {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding-bottom: 0.875rem;
    border-bottom: 1px solid var(--border-color);
}

.card-icon {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    font-family: 'Courier New', monospace;
    flex-shrink: 0;
}

.icon-amber { background: rgba(232, 154, 60, 0.12); color: var(--accent-color); }
.icon-teal  { background: rgba(46, 196, 182, 0.12); color: #2ec4b6; }
.icon-red   { background: rgba(224, 92, 92, 0.12); color: #e05c5c; }
.icon-blue  { background: rgba(74, 144, 226, 0.12); color: var(--primary-color); }

.card-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-color);
}

.card-sub {
    font-size: 0.8rem;
    color: #a0aec0;
    font-family: 'Courier New', monospace;
}

/* ── FORM ELEMENTS ── */
.field-row {
    display: flex;
    gap: 0.75rem;
    align-items: flex-end;
}

.field-row.stack {
    flex-direction: column;
    gap: 0.5rem;
}

.field {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    flex: 1;
}

.field label {
    font-size: 0.7rem;
    font-family: 'Courier New', monospace;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: #94a3b8;
}

.toolbox-page input[type="number"],
.toolbox-page input[type="text"],
.toolbox-page select {
    min-height: 44px;
    background: rgba(26, 32, 44, 0.8);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-color);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    padding: 8px 12px;
    outline: none;
    width: 100%;
    -moz-appearance: textfield;
    transition: border-color 0.2s;
}

.toolbox-page input[type="number"]::-webkit-outer-spin-button,
.toolbox-page input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
}

.toolbox-page input:focus,
.toolbox-page select:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(232, 154, 60, 0.15);
}

.toolbox-page input:focus-visible,
.toolbox-page select:focus-visible,
.toolbox-page button:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.toolbox-page select option {
    background: var(--background-color);
}

/* ── RESULTS ── */
.result-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

.result-row.three {
    grid-template-columns: 1fr 1fr 1fr;
}

.result-box {
    background: rgba(26, 32, 44, 0.6);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.625rem 0.75rem;
}

.result-val {
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    color: var(--accent-color);
    font-weight: 400;
}

.result-val.teal { color: #2ec4b6; }
.result-val.red  { color: #e05c5c; }

.result-lbl {
    font-size: 0.7rem;
    color: #94a3b8;
    margin-top: 0.15rem;
}

.result-main {
    background: rgba(232, 154, 60, 0.05);
    border: 1px solid rgba(232, 154, 60, 0.25);
    border-radius: 4px;
    padding: 0.75rem 1rem;
    font-family: 'Courier New', monospace;
    font-size: 1rem;
    color: var(--accent-color);
    text-align: center;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.result-main.teal {
    background: rgba(46, 196, 182, 0.05);
    border-color: rgba(46, 196, 182, 0.25);
    color: #2ec4b6;
}

/* ── CHIP SELECTOR ── */
.chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.chip {
    min-height: 36px;
    padding: 8px 14px;
    font-size: 0.8rem;
    font-family: 'Courier New', monospace;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    color: #a0aec0;
    background: transparent;
    transition: all 0.15s;
}

.chip:hover {
    border-color: rgba(46, 196, 182, 0.5);
    color: #2ec4b6;
}

.chip.active {
    border-color: #2ec4b6;
    color: #2ec4b6;
    background: rgba(46, 196, 182, 0.08);
}

.chip:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* ── REFERENCE TABLE ── */
.ref-table {
    width: 100%;
    border-collapse: collapse;
}

.ref-table th {
    font-size: 0.65rem;
    font-family: 'Courier New', monospace;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: #94a3b8;
    padding: 0.4rem 0.5rem;
    border-bottom: 1px solid var(--border-color);
    text-align: left;
}

.ref-table td {
    font-size: 0.8rem;
    padding: 0.45rem 0.5rem;
    border-bottom: 1px solid rgba(74, 144, 226, 0.1);
    color: var(--text-color);
}

.ref-table td:not(:first-child) {
    font-family: 'Courier New', monospace;
    color: #2ec4b6;
    font-size: 0.8rem;
}

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

/* ── FORMULA ── */
.formula {
    font-family: 'Courier New', monospace;
    font-size: 0.8rem;
    color: #94a3b8;
    background: rgba(26, 32, 44, 0.6);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.5rem 0.75rem;
}

.formula-hint {
    font-family: 'Courier New', monospace;
    font-size: 0.7rem;
    color: #94a3b8;
    margin-top: 0.25rem;
}

/* ── GDT GRID ── */
.gdt-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 0.5rem;
}

.gdt-item {
    background: rgba(26, 32, 44, 0.6);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.75rem;
}

.gdt-sym {
    font-size: 1.5rem;
    color: #2ec4b6;
    line-height: 1.2;
}

.gdt-name {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-color);
    margin-top: 0.3rem;
}

.gdt-desc {
    font-size: 0.7rem;
    color: #94a3b8;
    margin-top: 0.15rem;
}

/* ── BEAM SVG ── */
.beam-svg {
    width: 100%;
    height: 56px;
    color: var(--text-color);
}

/* ── WARNING ── */
.warn {
    font-size: 0.7rem;
    color: #94a3b8;
    font-family: 'Courier New', monospace;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.4rem 0.625rem;
}

/* ── CLEAR BUTTON ── */
.btn-clear {
    min-height: 36px;
    padding: 6px 14px;
    font-size: 0.8rem;
    cursor: pointer;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: transparent;
    color: #a0aec0;
    font-family: 'Poppins', sans-serif;
    transition: border-color 0.2s, color 0.2s;
}

.btn-clear:hover {
    border-color: rgba(74, 144, 226, 0.5);
    color: var(--text-color);
}

/* ── RESPONSIVE ── */

/* Tablet */
@media (max-width: 768px) {
    .toolbox-page {
        padding-top: 65px;
    }

    .toolbox-tabs {
        top: 50px;
    }

    .toolbox-hero h1 {
        font-size: 1.6rem;
    }

    .toolbox-hero {
        padding: 2rem 5% 1rem;
    }

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

    .tool-card.wide {
        grid-column: span 1;
    }

    .result-row.three {
        grid-template-columns: 1fr 1fr;
    }

    .gdt-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }
}

/* Phone */
@media (max-width: 480px) {
    .toolbox-tabs {
        top: 44px;
        padding: 0.5rem 3%;
    }

    .toolbox-hero {
        padding: 1.5rem 4% 0.75rem;
    }

    .toolbox-hero h1 {
        font-size: 1.35rem;
    }

    .toolbox-panels {
        padding: 1rem 3% 3rem;
    }

    .tool-card {
        padding: 1.125rem;
    }

    .field-row {
        flex-direction: column;
    }

    .result-row,
    .result-row.three {
        grid-template-columns: 1fr 1fr;
    }

    .tab-pill {
        padding: 8px 14px;
        font-size: 0.8rem;
    }
}