:root {
    --bg-dark: #050505;
    --card-bg: rgba(255, 255, 255, 0.03);
    --card-border: rgba(255, 255, 255, 0.1);
    --text-main: #e0e0e0;
    --accent-cyan: #00f3ff;
    --accent-pink: #ff00aa;
    --valence-color: #ff0055;
    --inner-color: #00a8ff;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Microsoft YaHei', 'PingFang SC', system-ui, sans-serif;
    -webkit-tap-highlight-color: transparent;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    overflow-x: hidden;
}

.bg-animation {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%; z-index: -1;
    background: 
        radial-gradient(circle at 50% 50%, rgba(20, 30, 50, 0.5) 0%, transparent 50%),
        linear-gradient(0deg, rgba(0,243,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,243,255,0.03) 1px, transparent 1px);
    background-size: 100% 100%, 40px 40px, 40px 40px;
}

/* === 导航栏区域优化 === */
.control-panel {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    background: rgba(20, 20, 25, 0.95);
    backdrop-filter: blur(10px);
    padding: 12px 15px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    box-shadow: 0 5px 20px rgba(0,0,0,0.5);
    margin-bottom: 15px;
    z-index: 100;
    width: 100%;
    justify-content: center;
    align-items: center;
    position: sticky;
    top: 0;
}

.title-box h1 {
    font-size: 20px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 2px;
    background: linear-gradient(90deg, #fff, var(--accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    white-space: nowrap;
}

.mode-group {
    display: flex;
    background: rgba(0,0,0,0.3);
    border-radius: 8px;
    padding: 4px;
    gap: 4px;
    flex-wrap: wrap;
    justify-content: center;
}

.mode-btn {
    background: transparent;
    border: 1px solid transparent;
    color: #aaa;
    padding: 8px 12px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 13px;
    transition: 0.3s;
    font-weight: 500;
    white-space: nowrap;
}

.mode-btn:hover { color: #fff; background: rgba(255,255,255,0.05); }
.mode-btn.active {
    background: var(--accent-cyan);
    color: #000;
    font-weight: bold;
    box-shadow: 0 0 10px rgba(0, 243, 255, 0.4);
}

.search-box {
    width: 100%;
    max-width: 280px;
}

.search-box input {
    background: rgba(0,0,0,0.3);
    border: 1px solid #444;
    color: #fff;
    padding: 10px 15px;
    border-radius: 8px;
    outline: none;
    width: 100%;
    font-size: 14px;
}

/* === 周期表容器 === */
.table-wrapper {
    width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 10px;
    -webkit-overflow-scrolling: touch;
}

.periodic-table {
    display: grid;
    grid-template-columns: repeat(18, 68px);
    grid-template-rows: repeat(10, 76px);
    gap: 5px;
    margin: 0 auto 30px;
    transition: 0.5s;
    width: max-content;
}

.element {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 6px;
    position: relative;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 2px;
    opacity: 0;
    transform: scale(0.8);
}

.element.visible { opacity: 1; transform: scale(1); }

.element:hover {
    transform: scale(1.15) !important;
    z-index: 100;
    box-shadow: 0 0 25px rgba(0,0,0,0.8);
    border-color: #fff;
}

.element .atomic-number { 
    position: absolute; 
    top: 4px; 
    left: 5px; 
    font-size: 10px;
    opacity: 0.6; 
}

.element .symbol { 
    font-size: 24px;
    font-weight: 700; 
    text-shadow: 0 1px 3px rgba(0,0,0,0.5); 
    line-height: 1.1;
    margin-top: 4px;
    font-family: Arial, sans-serif;
}

.element .name { 
    font-size: 11px; 
    opacity: 0.95; 
    margin-top: 0px; 
    font-weight: 500;
}

.element .detail-val { 
    position: absolute; bottom: 3px; right: 5px; 
    font-size: 9px;
    color: var(--accent-cyan); 
    display: none; 
    font-weight: bold;
}

.element.placeholder {
    border-style: dashed;
    background: rgba(255, 255, 255, 0.01);
    justify-content: center;
    align-items: center;
    gap: 2px;
}
.element.placeholder .range-num {
    font-size: 11px;
    color: var(--accent-cyan);
    font-weight: bold;
}
.element.placeholder .name {
    font-size: 11px;
    opacity: 0.8;
    margin: 0;
}
.element.placeholder:hover {
    background: rgba(255, 255, 255, 0.08);
    border-style: solid;
    transform: scale(1.05) !important; 
}

.periodic-table.heatmap-active .element {
    border-color: rgba(0,0,0,0.2);
}
.periodic-table.heatmap-active .element .detail-val { display: block; }

/* === 图例区域优化 === */
.legend-wrapper {
    width: 100%;
    padding: 0 10px;
    margin-bottom: 15px;
}

.legend {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    max-width: 1000px;
    margin: 0 auto;
}
.legend-item {
    font-size: 12px;
    display: flex;
    align-items: center;
    padding: 6px 10px;
    border-radius: 15px;
    background: rgba(255,255,255,0.05);
    cursor: pointer;
    border: 1px solid transparent;
    transition: 0.3s;
}
.legend-item:hover { background: rgba(255,255,255,0.1); }
.legend-item.active {
    background: rgba(255,255,255,0.2);
    border-color: var(--accent-cyan);
    box-shadow: 0 0 10px rgba(0, 243, 255, 0.2);
}

.legend-color { width: 10px; height: 10px; border-radius: 3px; margin-right: 6px; flex-shrink: 0; }

/* === 弹窗样式 === */
.modal-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.9);
    backdrop-filter: blur(8px);
    z-index: 1000;
    display: flex; justify-content: center; align-items: center;
    opacity: 0; pointer-events: none; transition: 0.3s;
    padding: 10px;
}
.modal-overlay.open { opacity: 1; pointer-events: all; }

.hologram-card {
    width: 100%;
    max-width: 1000px;
    max-height: 90vh;
    background: linear-gradient(135deg, #1a1a20, #0a0a10);
    border: 1px solid rgba(0, 243, 255, 0.2);
    box-shadow: 0 0 60px rgba(0, 243, 255, 0.1);
    border-radius: 16px;
    display: flex;
    overflow: hidden;
    position: relative;
}

/* 优化后的关闭按钮 */
.close-btn {
    position: absolute; 
    top: 15px; 
    right: 15px; 
    font-size: 24px;
    color: #fff; 
    cursor: pointer; 
    z-index: 2000;
    width: 36px; 
    height: 36px;
    background: rgba(0, 0, 0, 0.6);
    border-radius: 50%;
    display: flex; 
    align-items: center; 
    justify-content: center;
    border: 1px solid rgba(255,255,255,0.1);
    transition: all 0.2s;
}
.close-btn:hover { 
    background: rgba(255, 0, 0, 0.8);
    transform: rotate(90deg);
}

.atom-visualizer {
    width: 35%;
    min-width: 280px;
    background: radial-gradient(circle at center, rgba(0,243,255,0.05), transparent 70%);
    display: flex; 
    justify-content: center; 
    align-items: center;
    perspective: 800px;
    border-right: 1px solid rgba(255,255,255,0.05);
    position: relative;
    cursor: grab;
    user-select: none;
}

.atom-visualizer:active { cursor: grabbing; }

.visualizer-hint {
    position: absolute;
    bottom: 15px;
    color: rgba(255,255,255,0.4);
    font-size: 12px;
    pointer-events: none;
}

.atom-container {
    width: 220px; height: 220px;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.1s linear; 
}

.nucleus {
    position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%);
    width: 12px; height: 12px; background: #fff; border-radius: 50%;
    box-shadow: 0 0 20px #fff; z-index: 20;
    transform-style: preserve-3d;
}

.orbit-ring {
    position: absolute; top: 50%; left: 50%;
    border-radius: 50%;
    border: 1px solid rgba(255,255,255,0.15);
    transform-style: preserve-3d;
}

.electron {
    position: absolute; top: 50%; left: 50%;
    border-radius: 50%;
    transform-origin: 0 0;
}

.electron.inner {
    width: 5px; height: 5px;
    background: var(--inner-color);
    box-shadow: 0 0 5px var(--inner-color);
}

.electron.valence {
    width: 8px; height: 8px;
    background: var(--valence-color);
    box-shadow: 0 0 12px var(--valence-color);
    z-index: 10;
}

.info-panel { 
    flex: 1; 
    padding: 25px; 
    display: flex; 
    flex-direction: column; 
    overflow-y: auto; 
    min-width: 0;
}

.header-row { 
    display: flex; 
    align-items: baseline; 
    margin-bottom: 15px; 
    border-bottom: 1px solid rgba(255,255,255,0.1); 
    padding-bottom: 12px;
    flex-wrap: wrap;
    gap: 10px;
    padding-right: 30px;
}
.big-symbol { font-size: 48px; font-weight: 700; color: var(--accent-cyan); margin-right: 15px; line-height: 1; font-family: Arial;}
.big-name { font-size: 24px; color: #fff; font-weight: bold; }
.category-tag { 
    margin-left: auto; 
    padding: 5px 10px; 
    border: 1px solid #444; 
    border-radius: 6px; 
    font-size: 12px; 
    color: #aaa; 
    text-transform: uppercase; 
    white-space: nowrap;
}

.config-box {
    background: rgba(0, 243, 255, 0.05);
    padding: 12px 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-family: 'Courier New', monospace;
    flex-shrink: 0;
}
.config-label { font-size: 12px; color: var(--accent-cyan); margin-bottom: 5px; display: block; font-weight: bold;}
.config-text { 
    font-size: 14px; 
    color: #e0e0e0; 
    letter-spacing: 1px; 
    word-break: break-all;
    white-space: normal;
    line-height: 1.5;
}

.info-section {
    margin-bottom: 20px;
    flex-shrink: 0;
}
.info-section h3 {
    font-size: 13px;
    color: var(--accent-cyan);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-bottom: 1px solid rgba(0, 243, 255, 0.2);
    padding-bottom: 5px;
}

.props-grid { 
    display: grid; 
    grid-template-columns: repeat(3, 1fr); 
    gap: 10px; 
}
.prop-item { 
    background: rgba(255,255,255,0.02);
    padding: 8px 10px;
    border-radius: 6px;
    border-left: 3px solid rgba(0, 243, 255, 0.3);
}
.prop-item label { font-size: 11px; color: #888; display: block; margin-bottom: 3px; }
.prop-item span { font-size: 14px; color: #fff; font-weight: 500; }

.valence-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.valence-tag {
    background: linear-gradient(135deg, rgba(255,0,85,0.2), rgba(255,0,170,0.1));
    border: 1px solid rgba(255,0,85,0.4);
    padding: 4px 12px;
    border-radius: 15px;
    font-size: 14px;
    color: #ff6699;
    font-weight: 600;
}

.isotope-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.isotope-tag {
    background: rgba(0, 168, 255, 0.1);
    border: 1px solid rgba(0, 168, 255, 0.3);
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 12px;
    color: #66ccff;
}
.isotope-tag .mass-num {
    font-size: 9px;
    vertical-align: super;
}
.isotope-stable {
    background: rgba(0, 255, 136, 0.1);
    border-color: rgba(0, 255, 136, 0.3);
    color: #66ff99;
}

/* === 移动端横屏提示 === */
.rotate-hint {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0;
    background: rgba(0, 243, 255, 0.1);
    border-bottom: 1px solid var(--accent-cyan);
    padding: 8px 15px;
    text-align: center;
    font-size: 12px;
    color: var(--accent-cyan);
    z-index: 99;
}

/* === 平板适配 (600px - 900px) === */
@media(max-width: 900px) {
    .hologram-card { 
        flex-direction: column; 
        max-height: 95vh; 
    }
    .atom-visualizer { 
        width: 100%; 
        min-width: auto; 
        height: 200px; 
        border-right: none; 
        border-bottom: 1px solid #333; 
        flex-shrink: 0;
    }
    .atom-container {
        width: 180px;
        height: 180px;
    }
    .props-grid { 
        grid-template-columns: repeat(2, 1fr); 
    }
    .info-panel {
        padding: 20px;
    }
    .big-symbol {
        font-size: 40px;
    }
    .big-name {
        font-size: 20px;
    }
}

/* === 手机端适配 (小于600px) === */
@media(max-width: 600px) {
    .rotate-hint {
        display: block;
    }

    .control-panel {
        padding: 10px;
        gap: 10px;
        flex-direction: column;
        align-items: stretch;
        margin-bottom: 10px;
    }

    .title-box {
        text-align: center;
    }

    .title-box h1 {
        font-size: 18px;
        letter-spacing: 1px;
    }

    .mode-group {
        justify-content: center;
        padding: 3px;
        gap: 3px;
    }

    .mode-btn {
        padding: 6px 8px;
        font-size: 11px;
    }

    .search-box {
        max-width: 100%;
    }

    .search-box input {
        padding: 12px 15px;
        font-size: 16px;
    }

    .table-wrapper {
        padding: 5px;
    }

    .periodic-table {
        grid-template-columns: repeat(18, 52px);
        grid-template-rows: repeat(10, 60px);
        gap: 3px;
    }

    .element .atomic-number {
        font-size: 8px;
        top: 2px;
        left: 3px;
    }

    .element .symbol {
        font-size: 18px;
        margin-top: 2px;
    }

    .element .name {
        font-size: 9px;
    }

    .element .detail-val {
        font-size: 7px;
        bottom: 2px;
        right: 3px;
    }

    .element.placeholder .range-num {
        font-size: 9px;
    }

    .element.placeholder .name {
        font-size: 9px;
    }

    .element:hover {
        transform: scale(1.1) !important;
    }

    .legend-wrapper {
        padding: 0 5px;
        margin-bottom: 10px;
    }

    .legend {
        gap: 5px;
    }

    .legend-item {
        font-size: 10px;
        padding: 5px 8px;
    }

    .legend-color {
        width: 8px;
        height: 8px;
        margin-right: 4px;
    }

    /* 弹窗移动端重大优化 */
    .modal-overlay {
        padding: 0;
        align-items: flex-end;
    }

    .hologram-card {
        max-height: 100dvh; 
        height: 100dvh;
        border-radius: 16px 16px 0 0;
        flex-direction: column;
    }

    /* 移动端关闭按钮调整位置 */
    .close-btn {
        top: 15px;
        right: 15px;
        width: 40px;
        height: 40px;
        background: rgba(0,0,0,0.8);
        box-shadow: 0 2px 10px rgba(0,0,0,0.5);
    }

    .atom-visualizer {
        height: 180px;
        min-height: 180px;
        padding-top: env(safe-area-inset-top); 
    }

    .atom-container {
        width: 150px;
        height: 150px;
    }

    .visualizer-hint {
        font-size: 11px;
        bottom: 10px;
    }

    .info-panel {
        padding: 15px 20px;
        flex: 1;
        overflow-y: auto;
        padding-bottom: 80px; 
        -webkit-overflow-scrolling: touch;
    }

    .header-row {
        margin-bottom: 12px;
        padding-bottom: 10px;
        gap: 8px;
        padding-right: 0;
    }

    .big-symbol {
        font-size: 36px;
        margin-right: 10px;
    }

    .big-name {
        font-size: 18px;
    }

    #m-en-name {
        font-size: 14px !important;
    }

    .category-tag {
        font-size: 10px;
        padding: 4px 8px;
        margin-left: 0;
    }

    /* 电子排布修复 */
    .config-box {
        padding: 10px 12px;
        margin-bottom: 15px;
        overflow-x: auto;
    }

    .config-label {
        font-size: 11px;
    }

    .config-text {
        font-size: 13px;
        line-height: 1.6;
    }

    #m-config-shell {
        font-size: 11px !important;
    }

    .info-section {
        margin-bottom: 15px;
    }

    .info-section h3 {
        font-size: 12px;
        margin-bottom: 8px;
    }

    .props-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
    }

    .prop-item {
        padding: 6px 8px;
    }

    .prop-item label {
        font-size: 10px;
    }

    .prop-item span {
        font-size: 13px;
    }

    .valence-tags {
        gap: 6px;
    }

    .valence-tag {
        font-size: 13px;
        padding: 3px 10px;
    }

    .isotope-tags {
        gap: 6px;
    }

    .isotope-tag {
        font-size: 11px;
        padding: 3px 8px;
    }
}

/* === 超小屏幕 (小于400px) === */
@media(max-width: 400px) {
    .periodic-table {
        grid-template-columns: repeat(18, 44px);
        grid-template-rows: repeat(10, 52px);
        gap: 2px;
    }

    .element .atomic-number {
        font-size: 7px;
    }

    .element .symbol {
        font-size: 15px;
    }

    .element .name {
        font-size: 8px;
    }

    .mode-btn {
        padding: 5px 6px;
        font-size: 10px;
    }

    .legend-item {
        font-size: 9px;
        padding: 4px 6px;
    }

    .props-grid {
        grid-template-columns: 1fr;
    }
}

/* === 横屏模式优化 === */
@media(max-height: 500px) and (orientation: landscape) {
    .rotate-hint {
        display: none;
    }

    .control-panel {
        padding: 8px 15px;
        flex-direction: row;
    }

    .hologram-card {
        flex-direction: row;
        height: 100vh;
        max-height: 100vh;
        border-radius: 0;
    }

    .atom-visualizer {
        width: 35%;
        height: 100%;
        min-width: 200px;
    }

    .info-panel {
        padding: 15px;
    }

    .header-row {
        margin-bottom: 10px;
        padding-bottom: 8px;
    }

    .big-symbol {
        font-size: 32px;
    }

    .big-name {
        font-size: 16px;
    }

    .config-box {
        margin-bottom: 10px;
        padding: 8px 10px;
    }

    .info-section {
        margin-bottom: 10px;
    }

    .props-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 6px;
    }
}