* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-dark: #0a0a0f;
    --bg-indigo: #1a1a2e;
    --neon-blue: #00d4ff;
    --neon-purple: #9d00ff;
    --neon-pink: #ff00f7;
    --neon-green: #00ff88;
    --neon-yellow: #ffea00;
    --neon-orange: #ff6b00;
    --neon-red: #ff0040;
    --neon-cyan: #00ffff;
    --text-light: rgba(255, 255, 255, 0.95);
    --text-dim: rgba(255, 255, 255, 0.6);
}

body {
    font-family: 'Segoe UI', 'Roboto', 'Helvetica Neue', sans-serif;
    background: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-indigo) 50%, var(--bg-dark) 100%);
    min-height: 100vh;
    color: var(--text-light);
    overflow: hidden;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(157, 0, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(0, 212, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 50% 20%, rgba(255, 0, 247, 0.05) 0%, transparent 50%);
    pointer-events: none;
    z-index: 1;
}

.preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-indigo) 100%);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 10000;
    transition: opacity 0.5s ease-out;
}

.preloader.fade-out {
    opacity: 0;
    pointer-events: none;
}

.atom-loader {
    width: 150px;
    height: 150px;
    position: relative;
}

.nucleus {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 30px;
    height: 30px;
    transform: translate(-50%, -50%);
    background: radial-gradient(circle, var(--neon-blue) 0%, var(--neon-purple) 100%);
    border-radius: 50%;
    box-shadow: 0 0 30px var(--neon-blue), 0 0 60px var(--neon-purple);
    animation: pulse 1.5s infinite;
}

.orbit {
    position: absolute;
    border: 1px solid rgba(0, 212, 255, 0.3);
    border-radius: 50%;
    animation: rotate 3s linear infinite;
}

.orbit1 {
    width: 60px;
    height: 60px;
    top: 45px;
    left: 45px;
    animation-duration: 2s;
}

.orbit2 {
    width: 90px;
    height: 90px;
    top: 30px;
    left: 30px;
    animation-duration: 3s;
    animation-direction: reverse;
}

.orbit3 {
    width: 120px;
    height: 120px;
    top: 15px;
    left: 15px;
    animation-duration: 4s;
}

.electron {
    position: absolute;
    width: 8px;
    height: 8px;
    background: var(--neon-cyan);
    border-radius: 50%;
    top: -4px;
    left: 50%;
    transform: translateX(-50%);
    box-shadow: 0 0 10px var(--neon-cyan), 0 0 20px var(--neon-cyan);
}

.loading-text {
    margin-top: 30px;
    font-size: 1.2rem;
    letter-spacing: 3px;
    color: var(--text-dim);
}

.loading-text span {
    display: inline-block;
    animation: wave 1.5s ease-in-out infinite;
}

.loading-text span:nth-child(1) { animation-delay: 0s; }
.loading-text span:nth-child(2) { animation-delay: 0.1s; }
.loading-text span:nth-child(3) { animation-delay: 0.2s; }
.loading-text span:nth-child(4) { animation-delay: 0.3s; }
.loading-text span:nth-child(5) { animation-delay: 0.4s; }
.loading-text span:nth-child(6) { animation-delay: 0.5s; }
.loading-text span:nth-child(7) { animation-delay: 0.6s; }
.loading-text span:nth-child(8) { animation-delay: 0.7s; }
.loading-text span:nth-child(9) { animation-delay: 0.8s; }
.loading-text span:nth-child(10) { animation-delay: 0.9s; }
.loading-text span:nth-child(11) { animation-delay: 1s; }

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes pulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); }
    50% { transform: translate(-50%, -50%) scale(1.2); }
}

@keyframes wave {
    0%, 100% { transform: translateY(0); color: var(--text-dim); }
    50% { transform: translateY(-10px); color: var(--neon-cyan); }
}

.container {
    width: 100vw;
    height: 100vh;
    padding: 5px;
    display: flex;
    flex-direction: column;
    position: relative;
    z-index: 2;
    overflow: hidden;
}

.header {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 8px;
    position: relative;
}

.home-button {
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 8px 12px;
    background: rgba(26, 26, 46, 0.5);
    border: 1px solid rgba(0, 212, 255, 0.2);
    border-radius: 20px;
    color: var(--text-dim);
    text-decoration: none;
    font-size: 0.8rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.home-button:hover {
    color: var(--text-light);
    border-color: rgba(0, 212, 255, 0.5);
    background: rgba(0, 212, 255, 0.1);
    transform: translateY(-50%) scale(1.05);
    box-shadow: 0 0 15px rgba(0, 212, 255, 0.3);
}

.home-icon {
    font-size: 1rem;
}

.spacer {
    width: 120px;
}

.main-title {
    text-align: center;
    margin: 0;
    animation: glow 2s ease-in-out infinite alternate;
}

.title-text {
    display: block;
    font-size: clamp(1rem, 2.5vw, 1.6rem);
    font-weight: 300;
    letter-spacing: 3px;
    background: linear-gradient(90deg, var(--neon-blue), var(--neon-purple), var(--neon-pink));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
}

.title-subtext {
    display: block;
    font-size: clamp(0.7rem, 1.5vw, 1rem);
    font-weight: 200;
    letter-spacing: 4px;
    color: var(--text-dim);
    margin-top: 3px;
}

@keyframes glow {
    from { filter: brightness(1) drop-shadow(0 0 15px rgba(0, 212, 255, 0.3)); }
    to { filter: brightness(1.1) drop-shadow(0 0 20px rgba(157, 0, 255, 0.4)); }
}

.legend {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 6px;
    margin-bottom: 8px;
    padding: 6px;
    background: rgba(26, 26, 46, 0.2);
    backdrop-filter: blur(5px);
    border-radius: 10px;
    border: 1px solid rgba(0, 212, 255, 0.05);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 3px;
    font-size: clamp(0.5rem, 1vw, 0.7rem);
    color: var(--text-dim);
    padding: 2px 6px;
    border-radius: 15px;
    transition: all 0.3s ease;
    cursor: pointer;
    border: 1px solid transparent;
}

.legend-item:hover {
    color: var(--text-light);
    transform: translateY(-1px);
    background: rgba(255, 255, 255, 0.05);
}

.legend-item.active {
    color: var(--text-light);
    background: rgba(0, 212, 255, 0.1);
    border-color: rgba(0, 212, 255, 0.3);
    box-shadow: 0 0 10px rgba(0, 212, 255, 0.2);
}

.color-box {
    width: 10px;
    height: 10px;
    border-radius: 2px;
    position: relative;
}

.alkali-metals { 
    background: var(--neon-red);
    box-shadow: 0 0 5px var(--neon-red);
}

.alkaline-earth-metals { 
    background: var(--neon-orange);
    box-shadow: 0 0 5px var(--neon-orange);
}

.transition-metals { 
    background: var(--neon-blue);
    box-shadow: 0 0 5px var(--neon-blue);
}

.post-transition-metals { 
    background: var(--neon-cyan);
    box-shadow: 0 0 5px var(--neon-cyan);
}

.metalloids { 
    background: var(--neon-green);
    box-shadow: 0 0 5px var(--neon-green);
}

.nonmetals { 
    background: var(--neon-purple);
    box-shadow: 0 0 5px var(--neon-purple);
}

.halogens { 
    background: var(--neon-pink);
    box-shadow: 0 0 5px var(--neon-pink);
}

.noble-gases { 
    background: var(--neon-yellow);
    box-shadow: 0 0 5px var(--neon-yellow);
}

.lanthanides { 
    background: linear-gradient(135deg, var(--neon-pink), var(--neon-purple));
    box-shadow: 0 0 5px var(--neon-pink);
}

.actinides { 
    background: linear-gradient(135deg, var(--neon-yellow), var(--neon-orange));
    box-shadow: 0 0 5px var(--neon-yellow);
}

.all-elements {
    background: linear-gradient(45deg, var(--neon-blue), var(--neon-purple), var(--neon-pink), var(--neon-cyan));
    box-shadow: 0 0 5px var(--neon-blue);
}

.periodic-table {
    display: grid;
    grid-template-columns: repeat(18, 1fr);
    gap: 1px;
    flex: 1;
    margin-bottom: 5px;
    max-width: 100%;
    max-height: calc(100vh - 120px);
    animation: fadeInUp 0.8s ease-out;
    background: 
        linear-gradient(to right, rgba(0, 212, 255, 0.03) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
    background-size: calc(100% / 18) auto;
    padding: 2px;
    border-radius: 8px;
    border: 1px solid rgba(0, 212, 255, 0.05);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.element {
    background: rgba(26, 26, 46, 0.4);
    backdrop-filter: blur(3px);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 3px;
    padding: 1px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    aspect-ratio: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    animation: elementFadeIn 0.5s ease-out;
    min-height: 35px;
}

.element.filtered {
    opacity: 0.1;
    transform: scale(0.85);
    filter: grayscale(1) brightness(0.3);
    pointer-events: none;
}

.element.highlighted {
    opacity: 1;
    transform: scale(1.08);
    filter: brightness(1.5) saturate(1.3);
    animation: highlightPulse 1.5s ease-in-out infinite;
    z-index: 10;
}

@keyframes highlightPulse {
    0%, 100% {
        box-shadow: 
            0 0 10px currentColor,
            0 0 20px currentColor,
            0 0 30px currentColor,
            inset 0 0 10px rgba(255, 255, 255, 0.15);
    }
    50% {
        box-shadow: 
            0 0 15px currentColor,
            0 0 30px currentColor,
            0 0 45px currentColor,
            inset 0 0 15px rgba(255, 255, 255, 0.25);
    }
}

@keyframes elementFadeIn {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.element::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: inherit;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: -1;
}

.element:hover {
    transform: scale(1.08) translateZ(10px);
    z-index: 100;
    border-color: currentColor;
    animation: neonPulse 1.5s ease-in-out infinite;
}

@keyframes neonPulse {
    0%, 100% {
        box-shadow: 
            0 0 3px currentColor,
            0 0 6px currentColor,
            0 0 9px currentColor,
            inset 0 0 5px rgba(255, 255, 255, 0.05);
    }
    50% {
        box-shadow: 
            0 0 6px currentColor,
            0 0 12px currentColor,
            0 0 18px currentColor,
            inset 0 0 8px rgba(255, 255, 255, 0.1);
    }
}

.element.alkali-metals { 
    border-color: var(--neon-red);
    color: var(--neon-red);
}

.element.alkaline-earth-metals { 
    border-color: var(--neon-orange);
    color: var(--neon-orange);
}

.element.transition-metals { 
    border-color: var(--neon-blue);
    color: var(--neon-blue);
}

.element.post-transition-metals { 
    border-color: var(--neon-cyan);
    color: var(--neon-cyan);
}

.element.metalloids { 
    border-color: var(--neon-green);
    color: var(--neon-green);
}

.element.nonmetals { 
    border-color: var(--neon-purple);
    color: var(--neon-purple);
}

.element.halogens { 
    border-color: var(--neon-pink);
    color: var(--neon-pink);
}

.element.noble-gases { 
    border-color: var(--neon-yellow);
    color: var(--neon-yellow);
}

.element.lanthanides { 
    border-color: var(--neon-pink);
    color: var(--neon-pink);
}

.element.actinides { 
    border-color: var(--neon-yellow);
    color: var(--neon-yellow);
}

.element-number {
    font-size: clamp(0.4rem, 0.6vw, 0.5rem);
    position: absolute;
    top: 1px;
    left: 2px;
    opacity: 0.6;
}

.element-symbol {
    font-size: clamp(0.8rem, 2vw, 1.4rem);
    font-weight: 300;
    letter-spacing: 0.5px;
    filter: brightness(1.3);
}

.element-name {
    font-size: clamp(0.3rem, 0.5vw, 0.45rem);
    opacity: 0.7;
    margin-top: 1px;
}

.element-mass {
    font-size: clamp(0.3rem, 0.4vw, 0.4rem);
    opacity: 0.5;
}

.empty-cell {
    visibility: hidden;
}

.lanthanides-actinides {
    padding: 4px;
    background: rgba(26, 26, 46, 0.2);
    backdrop-filter: blur(5px);
    border-radius: 8px;
    border: 1px solid rgba(0, 212, 255, 0.05);
    max-height: 80px;
}

.lanthanides-row, .actinides-row {
    display: grid;
    grid-template-columns: repeat(15, 1fr);
    gap: 1px;
    margin-bottom: 2px;
}

.lanthanides-row:last-child {
    margin-bottom: 0;
}

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(20px);
    animation: fadeIn 0.3s;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: linear-gradient(135deg, rgba(26, 26, 46, 0.95) 0%, rgba(10, 10, 15, 0.95) 100%);
    margin: 2% auto;
    padding: 20px;
    border: 1px solid rgba(0, 212, 255, 0.3);
    border-radius: 20px;
    width: 90%;
    max-width: 1000px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 
        0 0 50px rgba(0, 212, 255, 0.3),
        inset 0 0 30px rgba(157, 0, 255, 0.1);
    animation: slideIn 0.3s;
}

.modal-content::-webkit-scrollbar {
    width: 8px;
}

.modal-content::-webkit-scrollbar-track {
    background: rgba(26, 26, 46, 0.5);
    border-radius: 10px;
}

.modal-content::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--neon-blue), var(--neon-purple));
    border-radius: 10px;
}

@keyframes slideIn {
    from {
        transform: translateY(-50px) scale(0.95);
        opacity: 0;
    }
    to {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
}

.close {
    color: var(--text-dim);
    float: right;
    font-size: 28px;
    font-weight: 300;
    cursor: pointer;
    transition: all 0.3s;
}

.close:hover {
    color: var(--neon-red);
    transform: rotate(90deg);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid rgba(0, 212, 255, 0.2);
}

.modal-header h2 {
    font-size: 2rem;
    font-weight: 300;
    letter-spacing: 3px;
    background: linear-gradient(90deg, var(--neon-blue), var(--neon-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.symbol-display {
    text-align: center;
}

#modalElementSymbol {
    font-size: 3rem;
    font-weight: 200;
    color: var(--neon-cyan);
    display: block;
    text-shadow: 0 0 20px currentColor;
}

#modalAtomicNumber {
    font-size: 1rem;
    color: var(--text-dim);
    letter-spacing: 2px;
}

.modal-body {
    display: grid;
    gap: 20px;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.info-section {
    background: rgba(26, 26, 46, 0.5);
    padding: 15px;
    border-radius: 10px;
    border: 1px solid rgba(0, 212, 255, 0.1);
    transition: all 0.3s ease;
}

.info-section:hover {
    border-color: rgba(0, 212, 255, 0.3);
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(0, 212, 255, 0.1);
}

.info-section h3 {
    color: var(--neon-cyan);
    margin-bottom: 10px;
    font-size: 0.9rem;
    font-weight: 300;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.info-section p {
    margin: 8px 0;
    color: var(--text-dim);
    font-size: 0.9rem;
}

.info-section strong {
    color: var(--text-light);
    font-weight: 400;
}

.electron-config-section {
    background: rgba(26, 26, 46, 0.5);
    padding: 15px;
    border-radius: 10px;
    border: 1px solid rgba(157, 0, 255, 0.2);
}

.electron-config-section h3 {
    color: var(--neon-purple);
    margin-bottom: 10px;
    font-size: 1rem;
    font-weight: 300;
    letter-spacing: 2px;
}

.electron-config {
    font-family: 'Courier New', monospace;
    font-size: 1.1rem;
    color: var(--neon-cyan);
    background: rgba(10, 10, 15, 0.5);
    padding: 10px;
    border-radius: 5px;
    margin-bottom: 15px;
    border: 1px solid rgba(0, 212, 255, 0.1);
    text-shadow: 0 0 5px currentColor;
}

.electron-shells {
    display: flex;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
}

.shell {
    background: linear-gradient(135deg, rgba(157, 0, 255, 0.2), rgba(0, 212, 255, 0.2));
    color: var(--text-light);
    padding: 8px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    border: 1px solid rgba(0, 212, 255, 0.3);
    animation: floatAnimation 3s ease-in-out infinite;
}

.shell:nth-child(odd) {
    animation-delay: 0.5s;
}

@keyframes floatAnimation {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
}

.atom-visualization {
    background: rgba(26, 26, 46, 0.5);
    padding: 15px;
    border-radius: 10px;
    border: 1px solid rgba(255, 0, 247, 0.2);
    text-align: center;
}

.atom-visualization h3 {
    color: var(--neon-pink);
    margin-bottom: 15px;
    font-size: 1rem;
    font-weight: 300;
    letter-spacing: 2px;
}

#atomCanvas {
    border: 1px solid rgba(255, 0, 247, 0.1);
    border-radius: 10px;
    background: radial-gradient(circle at center, rgba(157, 0, 255, 0.05) 0%, transparent 70%);
    max-width: 100%;
    height: auto;
}

.series-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    padding: 20px;
}

.series-element {
    background: rgba(26, 26, 46, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    padding: 15px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.series-element:hover {
    transform: scale(1.05);
    border-color: currentColor;
    box-shadow: 
        0 0 10px currentColor,
        0 0 20px currentColor;
}

.series-element.lanthanides {
    border-color: var(--neon-pink);
    color: var(--neon-pink);
}

.series-element.actinides {
    border-color: var(--neon-yellow);
    color: var(--neon-yellow);
}

.series-element-number {
    font-size: 0.8rem;
    opacity: 0.7;
    margin-bottom: 5px;
}

.series-element-symbol {
    font-size: 2rem;
    font-weight: 300;
    margin-bottom: 5px;
    filter: brightness(1.3);
}

.series-element-name {
    font-size: 0.9rem;
    opacity: 0.9;
    margin-bottom: 3px;
}

.series-element-mass {
    font-size: 0.8rem;
    opacity: 0.7;
}

.lanthanide-modal .modal-content {
    border-color: rgba(255, 0, 247, 0.3);
    box-shadow: 
        0 0 50px rgba(255, 0, 247, 0.3),
        inset 0 0 30px rgba(255, 0, 247, 0.1);
}

.actinide-modal .modal-content {
    border-color: rgba(255, 234, 0, 0.3);
    box-shadow: 
        0 0 50px rgba(255, 234, 0, 0.3),
        inset 0 0 30px rgba(255, 234, 0, 0.1);
}

.lanthanide-modal h2 {
    background: linear-gradient(90deg, var(--neon-pink), var(--neon-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.actinide-modal h2 {
    background: linear-gradient(90deg, var(--neon-yellow), var(--neon-orange));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

@media (max-width: 1200px) {
    .periodic-table {
        grid-template-columns: repeat(18, minmax(30px, 1fr));
    }
}

@media (max-width: 768px) {
    .container {
        padding: 5px;
    }
    
    .periodic-table {
        grid-template-columns: repeat(18, minmax(20px, 1fr));
        gap: 1px;
    }
    
    .element {
        padding: 1px;
    }
    
    .element-name,
    .element-mass {
        display: none;
    }
    
    .modal-content {
        width: 95%;
        margin: 2% auto;
        padding: 15px;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
    }
    
    .legend {
        gap: 5px;
        padding: 5px;
    }
    
    .legend-item {
        font-size: 0.6rem;
        padding: 2px 5px;
    }
}