/* ============================================
   PERIODIC TABLE DEVELOPER v5.0
   Professional Interactive Periodic Table
   ============================================ */

/* ---- CSS Variables ---- */
.ptd-app {
    --ptd-font-ar: 'Cairo', 'Segoe UI', Tahoma, sans-serif;
    --ptd-font-en: 'Inter', 'Segoe UI', Helvetica, sans-serif;
    --ptd-cell-size: clamp(32px, 4.8vw, 72px);
    --ptd-cell-gap: clamp(1px, 0.15vw, 3px);
    --ptd-radius: 10px;
    --ptd-radius-sm: 6px;
    --ptd-radius-lg: 16px;
    --ptd-transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);

    /* Light theme */
    --ptd-bg: #ffffff;
    --ptd-text: #1a1a2e;
    --ptd-text-secondary: #4a4a6a;
    --ptd-text-muted: #8888a0;
    --ptd-border: #d0d0e0;
    --ptd-border-light: #e8e8f0;
    --ptd-input-bg: #f5f5fa;
    --ptd-cell-bg: #ffffff;
    --ptd-cell-hover-bg: #f8f8ff;
    --ptd-controls-bg: #f8f8fc;
    --ptd-shadow: 0 2px 8px rgba(0,0,0,0.06);
    --ptd-shadow-hover: 0 8px 24px rgba(0,0,0,0.12);
    --ptd-shadow-lg: 0 16px 48px rgba(0,0,0,0.15);
    --ptd-modal-overlay: rgba(10,10,30,0.5);
    --ptd-modal-bg: #ffffff;
    --ptd-gradient-start: #667eea;
    --ptd-gradient-end: #764ba2;
    --ptd-scrollbar-thumb: #c0c0d0;
    --ptd-scrollbar-track: #f0f0f5;

    /* Category colors */
    --ptd-nonmetal: #43b581;
    --ptd-noble-gas: #9b59b6;
    --ptd-alkali-metal: #e74c3c;
    --ptd-alkaline-earth: #e67e22;
    --ptd-metalloid: #3498db;
    --ptd-halogen: #e91e8c;
    --ptd-metal: #1abc9c;
    --ptd-transition-metal: #5b8def;
    --ptd-lanthanide: #f39c12;
    --ptd-actinide: #c0392b;
}

/* Dark theme */
.ptd-app[data-theme="dark"] {
    --ptd-bg: #0f0f1a;
    --ptd-text: #e8e8f0;
    --ptd-text-secondary: #b0b0c8;
    --ptd-text-muted: #707090;
    --ptd-border: #2a2a40;
    --ptd-border-light: #1e1e30;
    --ptd-input-bg: #16162a;
    --ptd-cell-bg: #141428;
    --ptd-cell-hover-bg: #1c1c38;
    --ptd-controls-bg: #12122a;
    --ptd-shadow: 0 2px 8px rgba(0,0,0,0.3);
    --ptd-shadow-hover: 0 8px 24px rgba(0,0,0,0.5);
    --ptd-shadow-lg: 0 16px 48px rgba(0,0,0,0.6);
    --ptd-modal-overlay: rgba(0,0,0,0.7);
    --ptd-modal-bg: #16162a;
    --ptd-scrollbar-thumb: #3a3a50;
    --ptd-scrollbar-track: #0f0f1a;
}

/* ---- Base ---- */
.ptd-app {
    font-family: var(--ptd-font-ar);
    background: var(--ptd-bg);
    color: var(--ptd-text);
    padding: 20px;
    border-radius: var(--ptd-radius-lg);
    transition: background var(--ptd-transition), color var(--ptd-transition);
    position: relative;
    line-height: 1.4;
    direction: rtl;
}

.ptd-app[data-lang="en"] {
    font-family: var(--ptd-font-en);
    direction: ltr;
}

.ptd-app *, .ptd-app *::before, .ptd-app *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* Language visibility */
.ptd-app[data-lang="ar"] .ptd-label-en,
.ptd-app[data-lang="ar"] .ptd-state-en { display: none !important; }
.ptd-app[data-lang="en"] .ptd-label-ar,
.ptd-app[data-lang="en"] .ptd-state-ar { display: none !important; }

/* ============================================
   ROW 1: TOP TOOLBAR (3 columns)
   ============================================ */
.ptd-toolbar-row1 {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 20px;
    align-items: center;
    margin-bottom: 14px;
    padding: 14px 18px;
    background: var(--ptd-controls-bg);
    border-radius: var(--ptd-radius);
    border: 1px solid var(--ptd-border-light);
}

/* ---- Column 1: Search ---- */
.ptd-col-search {
    display: flex;
    align-items: center;
}

.ptd-search-wrapper {
    position: relative;
    flex-shrink: 0;
}

.ptd-search-icon {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 18px;
    height: 18px;
    color: var(--ptd-text-muted);
    pointer-events: none;
}

.ptd-app[data-lang="ar"] .ptd-search-icon { right: 12px; }
.ptd-app[data-lang="en"] .ptd-search-icon { left: 12px; }

.ptd-search-input {
    width: 220px;
    height: 40px;
    border: 1.5px solid var(--ptd-border);
    border-radius: 22px;
    background: var(--ptd-input-bg);
    color: var(--ptd-text);
    font-size: 14px;
    font-family: inherit;
    outline: none;
    transition: all var(--ptd-transition);
}

.ptd-app[data-lang="ar"] .ptd-search-input { padding: 0 40px 0 14px; }
.ptd-app[data-lang="en"] .ptd-search-input { padding: 0 14px 0 40px; }

.ptd-search-input:focus {
    border-color: var(--ptd-gradient-start);
    box-shadow: 0 0 0 3px rgba(102,126,234,0.15);
    width: 260px;
}

.ptd-search-input::placeholder {
    color: var(--ptd-text-muted);
    font-size: 13px;
}

.ptd-search-results {
    display: none;
    position: absolute;
    top: 100%;
    width: 300px;
    max-height: 350px;
    overflow-y: auto;
    background: var(--ptd-modal-bg);
    border: 1px solid var(--ptd-border);
    border-radius: var(--ptd-radius);
    box-shadow: var(--ptd-shadow-hover);
    z-index: 100;
    margin-top: 4px;
}

.ptd-app[data-lang="ar"] .ptd-search-results { right: 0; }
.ptd-app[data-lang="en"] .ptd-search-results { left: 0; }

.ptd-search-results.active { display: block; }

.ptd-search-result-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    cursor: pointer;
    transition: background var(--ptd-transition);
}

.ptd-search-result-item:hover {
    background: var(--ptd-input-bg);
}

.ptd-search-result-symbol {
    width: 40px;
    height: 40px;
    border-radius: var(--ptd-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 800;
    color: #fff;
    flex-shrink: 0;
    font-family: var(--ptd-font-en);
}

.ptd-search-result-info { flex: 1; min-width: 0; }
.ptd-search-result-name { font-size: 14px; font-weight: 700; }
.ptd-search-result-detail { font-size: 11px; color: var(--ptd-text-muted); }

/* ---- Column 2: Temperature + State Legend ---- */
.ptd-col-temp {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.ptd-temp-control {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.ptd-temp-top {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    font-weight: 700;
    color: var(--ptd-text-secondary);
}

.ptd-temp-display {
    margin-inline-start: auto;
    font-size: 16px;
    font-weight: 800;
    color: var(--ptd-text);
    font-family: var(--ptd-font-en);
    direction: ltr;
}

.ptd-temp-unit {
    font-size: 13px;
    font-weight: 600;
    color: var(--ptd-text-muted);
}

.ptd-temp-slider {
    width: 100%;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: linear-gradient(90deg, #3498db, #43b581, #f39c12, #e74c3c, #9b59b6);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
    direction: ltr;
}

.ptd-temp-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #fff;
    border: 3px solid var(--ptd-gradient-start);
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

.ptd-temp-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #fff;
    border: 3px solid var(--ptd-gradient-start);
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

.ptd-state-legend {
    display: flex;
    gap: 14px;
    align-items: center;
    font-size: 12px;
    color: var(--ptd-text-muted);
    font-weight: 600;
}

.ptd-state-legend-item {
    display: flex;
    align-items: center;
    gap: 5px;
}

/* State Legend Lines (matching the bottom strip on cells) */
.ptd-state-line {
    width: 24px;
    height: 4px;
    border-radius: 2px;
    flex-shrink: 0;
}

.ptd-state-line.sl-solid { background: #4caf50; }
.ptd-state-line.sl-liquid { background: #2196f3; box-shadow: 0 0 6px rgba(33,150,243,0.4); }
.ptd-state-line.sl-gas { background: #ff9800; box-shadow: 0 0 6px rgba(255,152,0,0.3); }
.ptd-state-line.sl-unknown { background: #9e9e9e; opacity: 0.5; }

/* ---- Column 3: Action Buttons ---- */
.ptd-col-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.ptd-action-btn {
    height: 40px;
    padding: 0 18px;
    border: 1.5px solid var(--ptd-border);
    border-radius: 22px;
    background: var(--ptd-input-bg);
    color: var(--ptd-text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all var(--ptd-transition);
    flex-shrink: 0;
    font-size: 13px;
    font-weight: 600;
    font-family: inherit;
    white-space: nowrap;
}

.ptd-action-btn:hover {
    border-color: var(--ptd-gradient-start);
    color: var(--ptd-gradient-start);
    background: rgba(102,126,234,0.08);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(102,126,234,0.2);
}

.ptd-action-btn:active {
    transform: translateY(0);
}

.ptd-btn-reset:hover {
    border-color: #ef4444;
    color: #ef4444;
    background: rgba(239,68,68,0.08);
    box-shadow: 0 4px 12px rgba(239,68,68,0.2);
}

.ptd-btn-pdf:hover {
    border-color: #10b981;
    color: #10b981;
    background: rgba(16,185,129,0.08);
    box-shadow: 0 4px 12px rgba(16,185,129,0.2);
}

.ptd-action-btn svg {
    flex-shrink: 0;
}

/* ---- Toggle Switch (Dark/Light) ---- */
.ptd-theme-switch-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
}

.ptd-theme-icon {
    color: var(--ptd-text-muted);
    flex-shrink: 0;
    transition: color var(--ptd-transition);
}

.ptd-sun-icon { color: #f39c12; }
.ptd-app[data-theme="dark"] .ptd-sun-icon { color: var(--ptd-text-muted); }
.ptd-app[data-theme="dark"] .ptd-moon-icon { color: #667eea; }

.ptd-toggle-switch {
    position: relative;
    display: inline-block;
    width: 48px;
    height: 26px;
    cursor: pointer;
    flex-shrink: 0;
}

.ptd-toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
    position: absolute;
}

.ptd-toggle-slider {
    position: absolute;
    inset: 0;
    background: #d0d0e0;
    border-radius: 26px;
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.ptd-toggle-slider::before {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #fff;
    top: 3px;
    left: 3px;
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 1px 4px rgba(0,0,0,0.2);
}

.ptd-app[data-theme="dark"] .ptd-toggle-slider {
    background: linear-gradient(135deg, var(--ptd-gradient-start), var(--ptd-gradient-end));
}

.ptd-app[data-theme="dark"] .ptd-toggle-slider::before {
    transform: translateX(22px);
}

/* ============================================
   ROW 2: PROPERTY SELECTOR BAR
   ============================================ */
.ptd-toolbar-row2 {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 14px;
    padding: 10px 18px;
    background: var(--ptd-controls-bg);
    border-radius: var(--ptd-radius);
    border: 1px solid var(--ptd-border-light);
    flex-wrap: wrap;
}

.ptd-property-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    font-weight: 700;
    color: var(--ptd-text-muted);
    flex-shrink: 0;
}

.ptd-property-select {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    flex: 1;
}

.ptd-app[data-lang="ar"] .ptd-property-select {
    direction: rtl;
    justify-content: flex-end;
}

.ptd-app[data-lang="en"] .ptd-property-select {
    direction: ltr;
    justify-content: flex-start;
}

.ptd-prop-btn {
    padding: 6px 14px;
    border: 1px solid var(--ptd-border-light);
    border-radius: 18px;
    background: var(--ptd-input-bg);
    color: var(--ptd-text-secondary);
    font-size: 12px;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--ptd-transition);
    white-space: nowrap;
    line-height: 1.3;
}

.ptd-prop-btn:hover {
    border-color: var(--ptd-gradient-start);
    color: var(--ptd-gradient-start);
    background: rgba(102,126,234,0.06);
}

.ptd-prop-btn.active {
    background: linear-gradient(135deg, var(--ptd-gradient-start), var(--ptd-gradient-end));
    color: #fff;
    border-color: transparent;
    box-shadow: 0 2px 8px rgba(102,126,234,0.3);
}

/* ============================================
   PERIODIC TABLE GRID
   ============================================ */
.ptd-table-container {
    overflow-x: auto;
    padding-bottom: 10px;
    direction: ltr;
    scrollbar-width: thin;
    scrollbar-color: var(--ptd-scrollbar-thumb) var(--ptd-scrollbar-track);
}

.ptd-table-container::-webkit-scrollbar { height: 8px; }
.ptd-table-container::-webkit-scrollbar-track { background: var(--ptd-scrollbar-track); border-radius: 4px; }
.ptd-table-container::-webkit-scrollbar-thumb { background: var(--ptd-scrollbar-thumb); border-radius: 4px; }

.ptd-periodic-grid {
    display: grid;
    grid-template-columns: repeat(18, var(--ptd-cell-size));
    gap: var(--ptd-cell-gap);
    width: fit-content;
    min-width: auto;
    padding: 4px;
    direction: ltr !important;
}

/* ---- Element Cell ---- */
.ptd-element-cell {
    position: relative;
    aspect-ratio: 1;
    border-radius: var(--ptd-radius-sm);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3px;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1.5px solid var(--ptd-border-light);
    overflow: hidden;
    background: var(--ptd-cell-bg);
}

.ptd-element-cell::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    opacity: 0.08;
    transition: opacity var(--ptd-transition);
}

.ptd-element-cell:hover {
    transform: scale(1.2);
    z-index: 10;
    box-shadow: var(--ptd-shadow-hover);
    background: var(--ptd-cell-hover-bg);
    border-color: var(--ptd-border);
}

.ptd-element-cell:hover::before {
    opacity: 0.18;
}

.ptd-element-cell.dimmed {
    opacity: 0.12;
    filter: grayscale(0.9);
    pointer-events: none;
}

.ptd-element-cell.highlighted {
    box-shadow: 0 0 0 2px currentColor, var(--ptd-shadow-hover);
    transform: scale(1.05);
    z-index: 5;
}

/* ---- State Indicators: Bottom border strip ---- */
.ptd-element-cell .ptd-state-indicator {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    height: 4px;
    border-radius: 0 0 4px 4px;
    z-index: 2;
    transition: all var(--ptd-transition);
}

.ptd-element-cell.state-solid .ptd-state-indicator { background: #4caf50; }
.ptd-element-cell.state-liquid .ptd-state-indicator { background: #2196f3; box-shadow: 0 0 8px rgba(33,150,243,0.5); }
.ptd-element-cell.state-gas .ptd-state-indicator { background: #ff9800; box-shadow: 0 0 8px rgba(255,152,0,0.4); }
.ptd-element-cell.state-unknown .ptd-state-indicator { background: #9e9e9e; opacity: 0.4; }

/* Element cell content - LARGER FONTS */
.ptd-element-number {
    font-size: clamp(7px, 0.7vw, 11px);
    font-weight: 700;
    color: var(--ptd-text-secondary);
    position: absolute;
    top: 3px;
    left: 4px;
    line-height: 1;
}

.ptd-element-mass {
    font-size: clamp(6px, 0.65vw, 10px);
    font-weight: 600;
    color: var(--ptd-text-secondary);
    position: absolute;
    top: 3px;
    right: 4px;
    line-height: 1;
    max-width: 46px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    text-align: right;
}

.ptd-element-symbol {
    font-size: clamp(14px, 1.8vw, 28px);
    font-weight: 800;
    line-height: 1;
    margin-top: 4px;
    font-family: var(--ptd-font-en);
    letter-spacing: -0.5px;
}

.ptd-element-name {
    font-size: clamp(6px, 0.65vw, 10px);
    font-weight: 600;
    line-height: 1.1;
    text-align: center;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: var(--ptd-text-secondary);
    margin-top: 1px;
}

/* Category color classes */
.ptd-cat-nonmetal { color: var(--ptd-nonmetal); }
.ptd-cat-nonmetal::before { background: var(--ptd-nonmetal); }
.ptd-cat-noble-gas { color: var(--ptd-noble-gas); }
.ptd-cat-noble-gas::before { background: var(--ptd-noble-gas); }
.ptd-cat-alkali-metal { color: var(--ptd-alkali-metal); }
.ptd-cat-alkali-metal::before { background: var(--ptd-alkali-metal); }
.ptd-cat-alkaline-earth { color: var(--ptd-alkaline-earth); }
.ptd-cat-alkaline-earth::before { background: var(--ptd-alkaline-earth); }
.ptd-cat-metalloid { color: var(--ptd-metalloid); }
.ptd-cat-metalloid::before { background: var(--ptd-metalloid); }
.ptd-cat-halogen { color: var(--ptd-halogen); }
.ptd-cat-halogen::before { background: var(--ptd-halogen); }
.ptd-cat-metal { color: var(--ptd-metal); }
.ptd-cat-metal::before { background: var(--ptd-metal); }
.ptd-cat-transition-metal { color: var(--ptd-transition-metal); }
.ptd-cat-transition-metal::before { background: var(--ptd-transition-metal); }
.ptd-cat-lanthanide { color: var(--ptd-lanthanide); }
.ptd-cat-lanthanide::before { background: var(--ptd-lanthanide); }
.ptd-cat-actinide { color: var(--ptd-actinide); }
.ptd-cat-actinide::before { background: var(--ptd-actinide); }

/* Spacer & label cells */
.ptd-spacer { visibility: hidden; }

.ptd-label-cell {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 700;
    color: var(--ptd-text-muted);
    background: transparent !important;
    border: none !important;
    cursor: default;
}

.ptd-label-cell:hover {
    transform: none !important;
    box-shadow: none !important;
    background: transparent !important;
}

/* Lanthanide/Actinide separator */
.ptd-separator-row {
    grid-column: 1 / -1;
    height: 10px;
}

.ptd-la-ac-label {
    grid-column: 1 / 3;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 700;
    color: var(--ptd-text-muted);
    padding: 4px;
    direction: ltr;
}

/* ============================================
   CATEGORY LEGEND (Inside grid empty space)
   ============================================ */
.ptd-category-legend-grid {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 5px 8px;
    padding: 10px 12px;
    align-self: center;
    align-content: center;
    z-index: 2;
}

.ptd-legend-item {
    display: flex;
    align-items: center;
    gap: 7px;
    padding: 5px 12px;
    border-radius: 18px;
    cursor: pointer;
    transition: all var(--ptd-transition);
    font-size: 12px;
    font-weight: 600;
    color: var(--ptd-text-secondary);
    white-space: nowrap;
    background: transparent;
    border: 1px solid transparent;
}

.ptd-legend-item:hover {
    background: var(--ptd-input-bg);
    border-color: var(--ptd-border-light);
}

.ptd-legend-item.active {
    background: var(--ptd-input-bg);
    border-color: var(--ptd-border);
    box-shadow: var(--ptd-shadow);
}

.ptd-legend-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    flex-shrink: 0;
}

/* ---- La/Ac Pointer Cells ---- */
.ptd-la-ac-pointer {
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--ptd-radius-sm);
    border: 2px dashed var(--ptd-border);
    background: var(--ptd-input-bg);
    cursor: default;
    aspect-ratio: 1;
    overflow: hidden;
}

.ptd-pointer-range {
    font-size: clamp(8px, 0.8vw, 12px);
    font-weight: 700;
    font-family: var(--ptd-font-en);
    text-align: center;
    line-height: 1.2;
    color: var(--ptd-text-muted);
}

.ptd-la-ac-pointer.ptd-cat-lanthanide {
    border-color: var(--ptd-lanthanide);
}

.ptd-la-ac-pointer.ptd-cat-lanthanide .ptd-pointer-range {
    color: var(--ptd-lanthanide);
}

.ptd-la-ac-pointer.ptd-cat-actinide {
    border-color: var(--ptd-actinide);
}

.ptd-la-ac-pointer.ptd-cat-actinide .ptd-pointer-range {
    color: var(--ptd-actinide);
}

/* ============================================
   LEGEND BOX (Example element)
   ============================================ */
.ptd-legend-box {
    position: relative;
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 18px;
    background: var(--ptd-controls-bg);
    border: 1.5px dashed var(--ptd-border);
    border-radius: var(--ptd-radius);
    direction: ltr;
    z-index: 2;
    align-self: center;
}

.ptd-legend-box-cell {
    width: 85px;
    height: 85px;
    border-radius: var(--ptd-radius-sm);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    flex-shrink: 0;
    border: 1.5px solid var(--ptd-border-light);
    background: var(--ptd-cell-bg);
}

.ptd-legend-box-cell::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    opacity: 0.08;
}

.ptd-legend-box-number {
    font-size: 10px;
    font-weight: 700;
    color: var(--ptd-text-secondary);
    position: absolute;
    top: 4px;
    left: 5px;
}

.ptd-legend-box-value {
    font-size: 9px;
    font-weight: 600;
    color: var(--ptd-text-secondary);
    position: absolute;
    top: 4px;
    right: 5px;
}

.ptd-legend-box-symbol {
    font-size: 26px;
    font-weight: 800;
    line-height: 1;
    margin-top: 4px;
    font-family: var(--ptd-font-en);
}

.ptd-legend-box-name {
    font-size: 10px;
    font-weight: 600;
    color: var(--ptd-text-secondary);
    margin-top: 2px;
}

.ptd-legend-box-labels {
    display: flex;
    flex-direction: column;
    gap: 3px;
    font-size: 12px;
    color: var(--ptd-text-muted);
    line-height: 1.5;
}

.ptd-legend-box-label {
    display: flex;
    align-items: center;
    gap: 6px;
}

.ptd-legend-box-arrow {
    font-size: 13px;
    color: var(--ptd-gradient-start);
}

.ptd-legend-box-label-text {
    font-weight: 600;
    color: var(--ptd-text-secondary);
}

.ptd-legend-box-label-desc {
    font-weight: 400;
    color: var(--ptd-text-muted);
    font-size: 11px;
}

/* ============================================
   MODAL
   ============================================ */
.ptd-modal {
    display: none;
    position: fixed;
    top: 0 !important;
    left: 0 !important;
    right: 0 !important;
    bottom: 0 !important;
    width: 100vw !important;
    height: 100vh !important;
    z-index: 2147483647 !important;
    align-items: center;
    justify-content: center;
    padding: 20px;
    isolation: isolate;
    /* Direct font families since modal is moved to body */
    font-family: 'Cairo', 'Segoe UI', Tahoma, sans-serif;
    line-height: 1.4;
    direction: rtl;
    color: #1a1a2e;
}

.ptd-modal.active {
    display: flex;
    user-select: none;
    -webkit-user-select: none;
}

.ptd-modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(10,10,30,0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    cursor: pointer;
}

.ptd-modal-content {
    position: relative;
    background: #ffffff;
    border-radius: 16px;
    max-width: 820px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 16px 48px rgba(0,0,0,0.15);
    border: 1px solid #d0d0e0;
    z-index: 1;
    animation: ptdModalIn 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    scrollbar-width: thin;
    scrollbar-color: #c0c0d0 #f0f0f5;
    user-select: text;
    -webkit-user-select: text;
}

.ptd-modal-content::-webkit-scrollbar { width: 6px; }
.ptd-modal-content::-webkit-scrollbar-track { background: #f0f0f5; }
.ptd-modal-content::-webkit-scrollbar-thumb { background: #c0c0d0; border-radius: 3px; }

/* Dark theme modal - applied via JS data attribute on modal itself */
.ptd-modal[data-theme="dark"] .ptd-modal-overlay {
    background: rgba(0,0,0,0.75);
}
.ptd-modal[data-theme="dark"] .ptd-modal-content {
    background: #16162a;
    border-color: #2a2a40;
    box-shadow: 0 16px 48px rgba(0,0,0,0.6);
    scrollbar-color: #3a3a50 #0f0f1a;
}
.ptd-modal[data-theme="dark"] .ptd-modal-content::-webkit-scrollbar-track { background: #0f0f1a; }
.ptd-modal[data-theme="dark"] .ptd-modal-content::-webkit-scrollbar-thumb { background: #3a3a50; }
.ptd-modal[data-theme="dark"] {
    color: #e8e8f0;
}
.ptd-modal[data-theme="dark"] .ptd-modal-close {
    background: rgba(255,255,255,0.08);
    color: #b0b0c8;
}
.ptd-modal[data-theme="dark"] .ptd-modal-prop {
    background: rgba(255,255,255,0.04);
    border-color: #2a2a40;
}
.ptd-modal[data-theme="dark"] .ptd-modal-prop:hover {
    border-color: #3a3a50;
}
.ptd-modal[data-theme="dark"] .ptd-modal-prop-label {
    color: #707090;
}
.ptd-modal[data-theme="dark"] .ptd-modal-prop-value {
    color: #e8e8f0;
}
.ptd-modal[data-theme="dark"] .ptd-modal-prop-unit {
    color: #707090;
}
.ptd-modal[data-theme="dark"] .ptd-modal-section-title {
    color: #b0b0c8;
    border-color: #2a2a40;
}
.ptd-modal[data-theme="dark"] .ptd-modal-badge {
    background: rgba(255,255,255,0.08);
    color: #b0b0c8;
}
.ptd-modal[data-theme="dark"] .ptd-modal-subtitle {
    color: #b0b0c8;
}

/* Language direction on modal */
.ptd-modal[data-lang="en"] {
    font-family: 'Inter', 'Segoe UI', Helvetica, sans-serif;
    direction: ltr;
}
.ptd-modal[data-lang="en"] .ptd-modal-close {
    float: right;
}

@keyframes ptdModalIn {
    from { opacity: 0; transform: scale(0.92) translateY(16px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

.ptd-modal-close {
    position: sticky;
    top: 12px;
    float: right;
    width: 40px;
    height: 40px;
    border: none;
    background: #f5f5fa;
    color: #1a1a2e;
    font-size: 24px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2;
    margin: 12px;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.ptd-modal[data-lang="ar"] .ptd-modal-close {
    float: left;
}

.ptd-modal-close:hover {
    background: #ef4444;
    color: #fff;
    transform: rotate(90deg);
}

.ptd-modal-body {
    padding: 0 28px 28px;
}

/* Modal Header */
.ptd-modal-header {
    display: flex;
    align-items: center;
    gap: 24px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.ptd-modal-element-card {
    width: 130px;
    height: 130px;
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 16px rgba(0,0,0,0.1);
}

.ptd-modal-element-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    opacity: 0.12;
}

.ptd-modal-element-number { font-size: 14px; font-weight: 500; opacity: 0.7; }
.ptd-modal-element-symbol { font-size: 50px; font-weight: 900; line-height: 1; font-family: 'Inter', 'Segoe UI', Helvetica, sans-serif; }
.ptd-modal-element-name { font-size: 14px; font-weight: 600; margin-top: 2px; }

.ptd-modal-info { flex: 1; min-width: 200px; }

.ptd-modal-title {
    font-size: 28px;
    font-weight: 800;
    margin: 0 0 4px;
    line-height: 1.2;
}

.ptd-modal-subtitle {
    font-size: 16px;
    color: #4a4a6a;
    margin: 0 0 12px;
}

.ptd-modal-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.ptd-modal-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 5px 14px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    background: #f5f5fa;
    border: 1px solid #d0d0e0;
}

/* Modal Sections */
.ptd-modal-section { margin-bottom: 20px; }

.ptd-modal-section-title {
    font-size: 16px;
    font-weight: 700;
    margin: 0 0 12px;
    padding-bottom: 8px;
    border-bottom: 2px solid #d0d0e0;
    display: flex;
    align-items: center;
    gap: 8px;
}

.ptd-modal-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 8px;
}

.ptd-modal-prop {
    display: flex;
    flex-direction: column;
    padding: 12px 16px;
    background: #f5f5fa;
    border-radius: 6px;
    border: 1px solid #e8e8f0;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.ptd-modal-prop:hover {
    border-color: #d0d0e0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.ptd-modal-prop-label {
    font-size: 11px;
    font-weight: 700;
    color: #8888a0;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.ptd-modal-prop-value {
    font-size: 15px;
    font-weight: 700;
    color: #1a1a2e;
    word-break: break-word;
}

.ptd-modal-prop-unit {
    font-size: 12px;
    font-weight: 400;
    color: #8888a0;
}

/* Electron Configuration */
.ptd-electron-config {
    font-family: 'Courier New', monospace;
    font-size: 16px;
    font-weight: 600;
    padding: 14px 18px;
    background: #f5f5fa;
    border-radius: 6px;
    border: 1px solid #e8e8f0;
    word-break: break-all;
    direction: ltr;
    text-align: left;
}

/* Energy Levels */
.ptd-energy-levels {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    padding: 14px;
    background: #f5f5fa;
    border-radius: 6px;
    border: 1px solid #e8e8f0;
    direction: ltr;
}

.ptd-energy-shell {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.ptd-energy-shell-label {
    font-size: 12px;
    font-weight: 700;
    color: #8888a0;
}

.ptd-energy-shell-value {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 15px;
    font-weight: 700;
    border: 2px solid;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1400px) {
    .ptd-legend-box { display: none; }
    .ptd-category-legend-grid { display: none; }
}

@media (max-width: 1100px) {
    .ptd-toolbar-row1 { grid-template-columns: 1fr; gap: 12px; }
    .ptd-col-actions { justify-content: center; }
    .ptd-col-temp { order: -1; }
}

@media (max-width: 900px) {
    .ptd-app { padding: 10px; }
    .ptd-element-name { display: none; }
    .ptd-element-mass {
        position: static;
        font-size: clamp(6px, 1.5vw, 10px);
        max-width: 95%;
        text-align: center;
        margin-top: 0;
        order: 4;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }
    .ptd-toolbar-row2 { flex-direction: column; align-items: stretch; }
    .ptd-search-input { width: 100%; }
    .ptd-search-input:focus { width: 100%; }
    .ptd-modal-header { flex-direction: column; align-items: center; text-align: center; }
    .ptd-modal-badges { justify-content: center; }
    .ptd-modal-grid { grid-template-columns: 1fr; }
    .ptd-prop-btn { font-size: 11px; padding: 4px 10px; }
    .ptd-legend-item { font-size: 11px; padding: 3px 8px; }
}

@media (max-width: 600px) {
    .ptd-modal-element-card { width: 100px; height: 100px; }
    .ptd-modal-element-symbol { font-size: 38px; }
    .ptd-modal-title { font-size: 22px; }
    .ptd-prop-btn { font-size: 10px; padding: 3px 8px; }
    .ptd-col-actions { flex-wrap: wrap; justify-content: center; }
    .ptd-action-btn { font-size: 12px; padding: 0 14px; height: 36px; }
}

/* ---- Print Styles ---- */
@media print {
    .ptd-toolbar-row1, .ptd-toolbar-row2 {
        display: none !important;
    }
    .ptd-app {
        background: #fff !important;
        color: #000 !important;
    }
    .ptd-element-cell {
        border: 1px solid #ccc !important;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }
}