:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-color: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --border: #334155;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border);
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
}

.logo span {
    color: var(--accent);
}

.token-badge {
    background-color: #334155;
    padding: 0.4rem 0.9rem;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.85rem;
}

.container {
    max-width: 1100px;
    margin: 1.5rem auto;
    padding: 0 1rem;
}

.home-layout {
    display: grid;
    grid-template-columns: 1.3fr 0.9fr;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

@media(max-width: 850px) {
    .home-layout {
        grid-template-columns: 1fr;
    }
}

.scientific-box {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1rem;
    box-shadow: 0 8px 20px rgba(0,0,0,0.3);
}

.screen-box {
    background-color: #020617;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.75rem;
    margin-bottom: 0.8rem;
    text-align: right;
}

.screen-input {
    color: var(--text-muted);
    font-size: 0.9rem;
    min-height: 1.2rem;
    overflow-x: auto;
}

.screen-output {
    color: #4ade80;
    font-size: 1.8rem;
    font-weight: 700;
}

.calc-body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

@media(max-width: 550px) {
    .calc-body {
        grid-template-columns: 1fr;
    }
}

.btn-row {
    display: flex;
    gap: 0.25rem;
    margin-bottom: 0.25rem;
}

.btn {
    flex: 1;
    padding: 0.6rem 0.2rem;
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: 5px;
    border: 1px solid var(--border);
    cursor: pointer;
    text-align: center;
}

.btn-sci {
    background-color: #0f172a;
    color: #93c5fd;
}

.btn-num {
    background-color: #334155;
    color: white;
}

.btn-op {
    background-color: #475569;
    color: #fbbf24;
}

.btn-action {
    background-color: #1e293b;
    color: #cbd5e1;
}

.btn-clear {
    background-color: #ef4444;
    color: white;
}

.btn-equal {
    background-color: #10b981;
    color: white;
}

.rad-deg-toggle {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.75rem;
    color: var(--text-muted);
    padding-left: 0.3rem;
}

.search-section h1 {
    font-size: 1.6rem;
    margin-bottom: 0.8rem;
}

.search-box {
    display: flex;
    gap: 0.5rem;
}

.search-box input {
    flex: 1;
    padding: 0.75rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    background-color: var(--card-bg);
    color: white;
}

.btn-search {
    padding: 0.75rem 1.2rem;
    background-color: var(--accent);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
}

.directory-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.dir-category {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.2rem;
}

.cat-header {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 0.8rem;
}

.cat-header a {
    color: white;
    text-decoration: none;
}

.calc-list {
    list-style: none;
}

.calc-list li {
    margin-bottom: 0.4rem;
}

.calc-list a {
    color: var(--text-muted);
    font-size: 0.85rem;
    text-decoration: none;
}

.calc-list a:hover {
    color: var(--accent);
}

footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    font-size: 0.85rem;
    border-top: 1px solid var(--border);
    margin-top: 3rem;
}