:root {
    --bg-color: #f4f6f9;
    --glass-bg: rgba(255, 255, 255, 0.8);
    --glass-border: rgba(0, 0, 0, 0.1);
    --accent: #0056b3;
    --accent-glow: rgba(0, 86, 179, 0.4);
    --text-primary: #1a1a1a;
    --text-muted: #555555;
    --tree-node: #0056b3;
    --tree-node-orbit: #d63384;
}

[data-theme="dark"] {
    --bg-color: #0b0f19;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --accent: #1a6cf5;
    --accent-glow: rgba(26, 108, 245, 0.45);
    --text-primary: #f0f4f8;
    --text-muted: #a0aab2;
    --tree-node: #00d2ff;
    --tree-node-orbit: #1a6cf5;
}

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

body {
    background-color: var(--bg-color);
    background-image: radial-gradient(circle at 15% 50%, var(--accent-glow), transparent 40%),
                      radial-gradient(circle at 85% 30%, var(--glass-border), transparent 40%);
    color: var(--text-primary);
    font-family: 'Outfit', sans-serif;
    min-height: 100vh;
}

.navbar {
    padding: 1.5rem 2rem;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
}

.brand {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: 1px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.theme-toggle {
    text-align: center;
    margin: 2rem 0;
    font-size: 1.1rem;
    color: var(--text-muted);
}
.theme-toggle label {
    margin: 0 0.5rem;
    cursor: pointer;
    color: var(--text-primary);
}

.search-container {
    text-align: center;
    margin: 2rem 0 4rem;
}

.glow-text {
    font-size: 3.5rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 2rem;
}

[data-theme="dark"] .glow-text {
    background: linear-gradient(90deg, #1a6cf5, #00d2ff);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.search-box {
    display: flex;
    justify-content: center;
    max-width: 600px;
    margin: 0 auto;
    gap: 1rem;
}

.search-box input {
    flex: 1;
    padding: 1rem 1.5rem;
    border-radius: 50px;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    color: var(--text-primary);
    font-size: 1.1rem;
    font-family: inherit;
    outline: none;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.search-box input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 20px var(--accent-glow);
}

.search-select {
    padding: 1rem;
    border-radius: 50px;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    color: var(--text-primary);
    font-size: 1.1rem;
    font-family: inherit;
    outline: none;
    backdrop-filter: blur(10px);
}

.search-select option {
    background: var(--bg-color);
    color: var(--text-primary);
}

.btn-primary {
    padding: 1rem 2rem;
    border-radius: 50px;
    border: none;
    background: var(--accent);
    color: #fff;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

[data-theme="dark"] .btn-primary {
    background: linear-gradient(90deg, #1a6cf5, #0ea5e9);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px var(--accent-glow);
}

.glass-panel {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 2rem;
    backdrop-filter: blur(12px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}
[data-theme="dark"] .glass-panel {
    box-shadow: 0 10px 40px rgba(0,0,0,0.6);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
}

/* Specific popups for better readability */
[data-theme="dark"] .mag-card,
[data-theme="dark"] .names-card,
[data-theme="dark"] .node-tooltip,
[data-theme="dark"] .dropdown-explore-content {
    background: rgba(15, 20, 30, 0.9) !important;
    -webkit-backdrop-filter: blur(20px) !important;
    backdrop-filter: blur(20px) !important;
    border: 1px solid rgba(255, 255, 255, 0.2) !important;
    box-shadow: 0 15px 50px rgba(0,0,0,0.9) !important;
}

.result-list {
    list-style: none;
    margin-top: 1.5rem;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1rem;
}

.system-link {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: var(--text-primary);
    text-decoration: none;
    transition: all 0.3s;
}

.system-link:hover {
    background: var(--glass-bg);
    border-color: var(--accent);
    transform: translateX(5px);
}

.dashboard-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
    margin-top: 2rem;
}

.system-header {
    text-align: center;
    margin-bottom: 2rem;
}

.simbad-link {
    color: var(--accent);
    text-decoration: none;
}
.simbad-link:hover {
    text-decoration: underline;
}
.all-names-sub {
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--text-muted);
}

.hierarchy-panel {
    grid-column: 1 / -1;
    min-height: 400px;
    display: flex;
    flex-direction: column;
}

#tree-container {
    flex: 1;
    margin-top: 1rem;
    width: 100%;
    overflow: hidden;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

.data-table th, .data-table td {
    padding: 0.8rem;
    text-align: left;
    border-bottom: 1px solid var(--glass-border);
}

.data-table tr:last-child td {
    border-bottom: none;
}

.data-table th {
    color: var(--text-muted);
    font-weight: 400;
}

.comp-scroll {
    width: 100%;
    margin-top: 1rem;
}

.fade-in {
    animation: fadeIn 0.4s ease forwards;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

h2, h3, h4 {
    color: var(--text-primary);
    margin-bottom: 1rem;
}

p {
    margin-bottom: 0.5rem;
    color: var(--text-muted);
}
strong { color: var(--text-primary); }
hr {
    border: 0;
    height: 1px;
    background: var(--glass-border);
    margin: 1.5rem 0;
}

.stats-panel {
    max-width: 900px;
    margin: 2rem auto;
    text-align: center;
}
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.2rem;
    margin-top: 1.5rem;
}
.stat-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 1rem;
    width: 100%;
    height: 110px;
    text-align: center;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
}
.stat-count {
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--accent);
}
.stat-label {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

.simbad-btn {
    position: absolute;
    right: 1.5rem;
    top: 1.5rem;
    padding: 0.5rem 1.5rem;
    text-decoration: none;
    font-size: 1rem;
    width: max-content;
    text-align: center;
}

.btn-disabled {
    border-radius: 50px;
    border: none;
    font-weight: 600;
    transition: none;
    background: var(--glass-border) !important;
    color: var(--text-muted) !important;
    cursor: not-allowed !important;
    box-shadow: none !important;
}

.toggle-group {
    display: inline-flex;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 50px;
    padding: 2px;
    align-items: center;
}

.toggle-btn {
    padding: 0.4rem 1rem;
    border-radius: 50px;
    border: none;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    background: transparent;
    color: var(--text-muted);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.toggle-btn:hover {
    color: var(--text-primary);
}

.toggle-btn.active {
    background: var(--accent);
    color: #fff !important;
    box-shadow: 0 2px 10px var(--accent-glow);
}

.select-none {
    user-select: none;
    -webkit-user-select: none;
}

/* Explore Dropdown */
.dropdown-explore {
    position: relative;
    display: inline-block;
}

.btn-explore {
    padding: 0.3rem 0.8rem;
    font-size: 0.85rem;
    border-radius: 4px;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
}

.btn-explore:hover {
    border-color: var(--accent);
    background: var(--accent-glow);
}

.dropdown-explore-content {
    display: none;
    position: absolute;
    left: 0;
    top: 100%;
    min-width: 150px;
    padding: 0.6rem;
    z-index: 1001;
    text-align: left;
}

/* Invisible bridge to keep menu open while moving mouse */
.dropdown-explore-content::before {
    content: '';
    position: absolute;
    top: -10px;
    left: 0;
    width: 100%;
    height: 10px;
}

.dropdown-explore:hover .dropdown-explore-content {
    display: block;
}

.dropdown-explore-content a {
    display: block;
    padding: 0.6rem 0.8rem;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.9rem;
    border-radius: 6px;
    transition: background 0.2s;
}

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