/* ====================================
   Chemistry / Periodic Table Styles
   ==================================== */

/* ---- Page Layout ---- */
.pt-page {
    font-family: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    padding: 10px;
}

.pt-page header {
    margin-bottom: 18px;
}

/* ---- Legend ---- */
.pt-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 16px;
    margin-bottom: 20px;
    padding: 12px 16px;
    background: #f9fafb;
    border-radius: 12px;
    border: 2px solid #e2e8f0;
}

.pt-legend h3 {
    width: 100%;
    margin: 0 0 6px;
    font-size: 0.85em;
    color: #555;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.78em;
    color: #444;
}

.legend-swatch {
    width: 18px;
    height: 18px;
    border-radius: 4px;
    border: 1px solid rgba(0,0,0,0.15);
    flex-shrink: 0;
}

/* ---- Periodic Table Grid ---- */
.periodic-table-wrapper {
    overflow-x: auto;
    padding-bottom: 10px;
}

.periodic-table {
    display: grid;
    grid-template-columns: repeat(18, minmax(54px, 1fr));
    grid-template-rows: repeat(10, 58px);
    gap: 3px;
    min-width: 990px;
    position: relative;
}

/* ---- Individual Element Cell ---- */
.element {
    border-radius: 6px;
    border: 1.5px solid rgba(0,0,0,0.12);
    padding: 3px 2px 2px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    position: relative;
    transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
    user-select: none;
    line-height: 1.1;
}

.element:hover {
    transform: scale(1.18);
    z-index: 50;
    box-shadow: 0 6px 20px rgba(0,0,0,0.25);
    border-color: rgba(0,0,0,0.35);
}

.element .el-number {
    font-size: 0.58em;
    color: rgba(0,0,0,0.55);
    align-self: flex-start;
    padding-left: 2px;
    line-height: 1.2;
}

.element .el-symbol {
    font-size: 1.25em;
    font-weight: 700;
    color: #1a202c;
    line-height: 1;
}

.element .el-name {
    font-size: 0.5em;
    color: rgba(0,0,0,0.6);
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 100%;
    padding: 0 2px;
}

.element .el-mass {
    font-size: 0.48em;
    color: rgba(0,0,0,0.5);
    line-height: 1.2;
}

/* ---- Placeholder cells (La*/Ac* in main grid) ---- */
.element.placeholder {
    cursor: default;
    opacity: 0.6;
}
.element.placeholder:hover {
    transform: none;
    box-shadow: none;
}

/* ---- Separator row label ---- */
.pt-separator-label {
    grid-column: 1 / 4;
    display: flex;
    align-items: center;
    font-size: 0.65em;
    color: #888;
    padding-left: 4px;
}

/* ---- Category Colors ---- */
.cat-metal            { background: #d6eaf8; }
.cat-metalloid        { background: #b2dfdb; }
.cat-nonmetal         { background: #c8f0d8; }
.cat-rare-earth       { background: #e1bee7; }
.cat-actinide         { background: #d1c4e9; }
/* Legacy aliases kept so any stray references don't break */
.cat-alkali-metal     { background: #d6eaf8; }
.cat-alkaline-earth   { background: #d6eaf8; }
.cat-transition       { background: #d6eaf8; }
.cat-post-trans       { background: #d6eaf8; }
.cat-halogen          { background: #c8f0d8; }
.cat-noble-gas        { background: #c8f0d8; }
.cat-lanthanide       { background: #e1bee7; }
.cat-unknown          { background: #d6eaf8; }

/* ---- Hover Tooltip ---- */
#pt-tooltip {
    position: fixed;
    z-index: 1000;
    pointer-events: none;
    max-width: 220px;
    background: #1a202c;
    color: #f7fafc;
    border-radius: 10px;
    padding: 10px 13px;
    font-size: 0.82em;
    box-shadow: 0 8px 24px rgba(0,0,0,0.35);
    line-height: 1.5;
    display: none;
}

#pt-tooltip .tip-symbol {
    font-size: 1.8em;
    font-weight: 800;
    display: block;
    line-height: 1;
    margin-bottom: 3px;
}

#pt-tooltip .tip-name {
    font-size: 1.05em;
    font-weight: 600;
}

#pt-tooltip .tip-category {
    font-size: 0.85em;
    opacity: 0.75;
    margin-bottom: 5px;
}

#pt-tooltip .tip-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.85em;
    border-top: 1px solid rgba(255,255,255,0.15);
    padding-top: 4px;
    margin-top: 4px;
    gap: 8px;
}

#pt-tooltip .tip-hint {
    margin-top: 6px;
    font-size: 0.75em;
    opacity: 0.55;
    text-align: center;
}

/* ---- Detail Modal ---- */
#pt-modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.55);
    z-index: 2000;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

#pt-modal-overlay.open {
    display: flex;
}

#pt-modal {
    background: #fff;
    border-radius: 18px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.35);
    max-width: 560px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    animation: modalPop 0.2s ease-out;
}

@keyframes modalPop {
    from { opacity: 0; transform: scale(0.88); }
    to   { opacity: 1; transform: scale(1); }
}

.modal-header {
    display: flex;
    align-items: center;
    gap: 18px;
    padding: 22px 24px 16px;
    border-radius: 18px 18px 0 0;
}

.modal-element-symbol {
    width: 74px;
    height: 74px;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border: 2.5px solid rgba(0,0,0,0.15);
    flex-shrink: 0;
}

.modal-element-symbol .m-num {
    font-size: 0.7em;
    color: rgba(0,0,0,0.5);
    align-self: flex-start;
    padding-left: 5px;
    line-height: 1;
}

.modal-element-symbol .m-sym {
    font-size: 2em;
    font-weight: 800;
    line-height: 1;
}

.modal-element-symbol .m-mass {
    font-size: 0.6em;
    color: rgba(0,0,0,0.5);
}

.modal-title h2 {
    font-size: 1.6em;
    color: #2d3748;
    margin: 0 0 4px;
}

.modal-title .modal-category {
    font-size: 0.85em;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 20px;
    display: inline-block;
    border: 1.5px solid rgba(0,0,0,0.12);
    color: #444;
}

.modal-close {
    margin-left: auto;
    background: none;
    border: none;
    font-size: 1.6em;
    cursor: pointer;
    color: #a0aec0;
    padding: 4px 8px;
    border-radius: 8px;
    line-height: 1;
    align-self: flex-start;
    transition: color 0.2s, background 0.2s;
}

.modal-close:hover {
    color: #e53e3e;
    background: #fff5f5;
}

.modal-body {
    padding: 0 24px 24px;
}

.modal-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 18px;
}

.stat-box {
    background: #f7fafc;
    border-radius: 10px;
    padding: 10px 14px;
    border: 1.5px solid #e2e8f0;
}

.stat-box .stat-label {
    font-size: 0.7em;
    color: #718096;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 2px;
}

.stat-box .stat-value {
    font-size: 1em;
    font-weight: 700;
    color: #2d3748;
}

.modal-description {
    background: #f0faf4;
    border-left: 4px solid #48bb78;
    border-radius: 0 10px 10px 0;
    padding: 12px 15px;
    font-size: 0.92em;
    color: #2d3748;
    line-height: 1.6;
    margin-bottom: 14px;
}

.modal-fun-fact {
    background: #fef9e7;
    border-left: 4px solid #f6c90e;
    border-radius: 0 10px 10px 0;
    padding: 10px 15px;
    font-size: 0.88em;
    color: #5d4d00;
    line-height: 1.5;
}

.modal-fun-fact strong {
    display: block;
    margin-bottom: 3px;
    color: #7d6400;
    font-size: 0.85em;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.modal-config {
    margin-top: 14px;
    font-family: 'Courier New', monospace;
    font-size: 0.82em;
    background: #1a202c;
    color: #68d391;
    padding: 10px 14px;
    border-radius: 8px;
}

.modal-config .config-label {
    color: #90cdf4;
    margin-bottom: 3px;
    font-family: inherit;
    font-size: 0.85em;
}

/* ---- Period / Group labels ---- */
.pt-group-label, .pt-period-label {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.65em;
    color: #999;
    font-weight: 600;
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
    .modal-stats {
        grid-template-columns: 1fr;
    }
    .pt-legend {
        gap: 6px 12px;
    }
}