:root {
    --bg-color: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --panel-bg: rgba(15, 23, 42, 0.9);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #38bdf8;
    --border-color: rgba(255, 255, 255, 0.1);
    --glass-blur: 12px;
    --transition-speed: 0.3s;
}

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

body {
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
    overflow-x: hidden;
}

#app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    padding: 2rem 4rem;
    background: linear-gradient(180deg, rgba(15, 23, 42, 1) 0%, rgba(15, 23, 42, 0) 100%);
    z-index: 10;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1600px;
    margin: 0 auto;
    flex-wrap: wrap;
    gap: 1rem;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    background: linear-gradient(to right, #38bdf8, #818cf8);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.controls {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

#element-search {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.75rem 1.5rem;
    border-radius: 9999px;
    width: 350px;
    font-size: 1rem;
    outline: none;
    transition: all var(--transition-speed);
    backdrop-filter: blur(var(--glass-blur));
}

#element-search:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.2);
}

.stats {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.lang-switcher {
    display: flex;
    gap: 0.5rem;
    background: var(--card-bg);
    padding: 0.25rem;
    border-radius: 9999px;
    border: 1px solid var(--border-color);
}

.lang-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: 9999px;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 600;
    transition: all var(--transition-speed);
}

.lang-btn.active {
    background: var(--accent-color);
    color: var(--bg-color);
}

.lang-btn:hover:not(.active) {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.nav-menu {
    display: flex;
    align-items: center;
}

.dropdown {
    position: relative;
    display: inline-block;
}

.dropbtn {
    background: var(--card-bg);
    color: var(--text-primary);
    padding: 0.75rem 1.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    border: 1px solid var(--border-color);
    border-radius: 9999px;
    cursor: pointer;
    transition: all var(--transition-speed);
    backdrop-filter: blur(var(--glass-blur));
}

.dropdown:hover .dropbtn {
    border-color: var(--accent-color);
    background: rgba(255, 255, 255, 0.05);
}

.dropdown-content {
    display: none;
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    background: var(--panel-bg);
    min-width: 200px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    border-radius: 1rem;
    border: 1px solid var(--border-color);
    backdrop-filter: blur(var(--glass-blur));
    z-index: 1000;
    overflow: visible;
    /* Changed from hidden to show the bridge */
    padding: 0.5rem;
}

/* Bridge to keep hover active */
.dropdown-content::before {
    content: '';
    position: absolute;
    top: -15px;
    /* Cover the gap + some buffer */
    left: 0;
    right: 0;
    height: 15px;
    background: transparent;
}

.dropdown-content a {
    color: var(--text-primary);
    padding: 0.75rem 1rem;
    text-decoration: none;
    display: block;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    transition: all 0.2s;
}

.dropdown-content a:hover {
    background: var(--accent-color);
    color: var(--bg-color);
}

.dropdown:hover .dropdown-content {
    display: block;
    animation: fadeInDown 0.3s ease;
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

main {
    flex: 1;
    position: relative;
    padding: 0 4rem;
    /* Increased side padding */
    display: flex;
    justify-content: flex-start;
    /* Shifted from center to left */
    align-items: flex-start;
}

#ptable-grid {
    display: grid;
    grid-template-columns: repeat(18, 1fr);
    grid-auto-rows: minmax(80px, auto);
    gap: 8px;
    margin: 2.5rem 0;
    /* Removed 'auto' to keep it left-aligned */
    width: 100%;
    max-width: 1400px;
}

.grid-label {
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 600;
    padding-bottom: 5px;
}

.element-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: all var(--transition-speed) ease;
    cursor: pointer;
    backdrop-filter: blur(var(--glass-blur));
}

.element-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-color);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
    z-index: 10;
}

.element-card .atomic-num {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.element-card .symbol {
    font-size: 1.5rem;
    font-weight: 700;
    text-align: center;
}

.element-card .name {
    font-size: 0.7rem;
    text-align: center;
    color: var(--text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
}

.isotope-badge {
    position: absolute;
    top: 5px;
    right: 5px;
    font-size: 0.6rem;
    background: var(--accent-color);
    color: var(--bg-color);
    padding: 1px 4px;
    border-radius: 4px;
    font-weight: 700;
}

/* Colors */
.element-card.type-metall {
    background: rgba(14, 165, 233, 0.2);
    border-color: #38bdf8;
}

.element-card.type-nichtmetall {
    background: rgba(239, 68, 68, 0.2);
    border-color: #f87171;
}

.element-card.type-halbmetall {
    background: rgba(34, 197, 94, 0.2);
    border-color: #4ade80;
}

.element-card.type-metall .symbol {
    color: #7dd3fc;
}

.element-card.type-nichtmetall .symbol {
    color: #fca5a5;
}

.element-card.type-halbmetall .symbol {
    color: #86efac;
}

/* Details Panel */
#details-panel {
    position: fixed;
    top: 2rem;
    right: 2rem;
    bottom: 2rem;
    width: 400px;
    background: var(--panel-bg);
    backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--border-color);
    border-radius: 1.5rem;
    z-index: 100;
    padding: 2.5rem;
    box-shadow: -20px 0 50px rgba(0, 0, 0, 0.5);
    transition: transform var(--transition-speed) ease;
    overflow-y: auto;
}

#details-panel.hidden {
    transform: translateX(120%);
}

#close-details {
    position: absolute;
    top: 1rem;
    right: 1.5rem;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 2rem;
    cursor: pointer;
}

.element-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.atomic-number {
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--text-secondary);
}

.symbol {
    font-size: 5rem;
    font-weight: 700;
    margin: 0.5rem 0;
    color: var(--accent-color);
}

.name {
    font-size: 2rem;
    font-weight: 600;
}

.properties-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.property-item {
    background: rgba(255, 255, 255, 0.03);
    padding: 1rem;
    border-radius: 0.75rem;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.property-label {
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.property-value {
    font-size: 1.125rem;
    font-weight: 500;
}

/* NMR Styles */
.nmr-section {
    margin-top: 2rem;
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
}

.nmr-section h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--accent-color);
}

.nmr-grid {
    display: grid;
    gap: 1rem;
}

.nmr-isotope-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 0.75rem;
    padding: 1rem;
}

.nmr-isotope-header {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding-bottom: 0.5rem;
    color: var(--accent-color);
}

.nmr-props {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

footer {
    padding: 3rem 2rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
    border-top: 1px solid var(--border-color);
    background: rgba(15, 23, 42, 0.5);
}

footer p {
    margin-bottom: 1rem;
}

footer ul {
    list-style: none;
    padding: 0;
    display: inline-flex;
    flex-direction: column;
    gap: 0.5rem;
    text-align: left;
}

footer a {
    color: #f97316;
    text-decoration: none;
    transition: all var(--transition-speed);
    border-bottom: 1px solid transparent;
}

footer a:hover {
    color: #fdba74;
    border-bottom-color: #fdba74;
}

/* Highlight search matches */
.search-highlight .cell {
    stroke: #fbbf24 !important;
    stroke-width: 3 !important;
    filter: drop-shadow(0 0 5px #fbbf24);
}

.dimmed,
.category-dimmed {
    opacity: 0.15;
    filter: grayscale(0.5);
}

.category-highlight .cell {
    stroke: var(--accent-color) !important;
    stroke-width: 3 !important;
    filter: drop-shadow(0 0 8px var(--accent-color));
}