:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-main: #f8fafc;
    --text-dim: #94a3b8;
    --accent: #38bdf8;
    --accent-hover: #7dd3fc;
    --border: #334155;
    --transition: all 0.2s ease-in-out;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Layout Shell */
.shell {
    display: grid;
    grid-template-columns: 260px 1fr;
    min-height: 100vh;
}

/* Sidebar Navigation */
.sidebar {
    background-color: var(--card-bg);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    position: sticky;
    top: 0;
    height: 100vh;
    box-shadow: 2px 0 10px rgba(0,0,0,0.2);
}

.logo {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
    padding-left: 5px;
}

.nav-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-dim);
    text-transform: uppercase;
    margin-bottom: 0.5rem;
    margin-left: 0.5rem;
}

.nav-item {
    padding: 0.6rem 1rem;
    border-radius: 8px;
    color: var(--text-main);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
    cursor: pointer;
    border: 1px solid transparent;
}

.nav-item:hover {
    background-color: var(--border);
    color: var(--accent);
}

.nav-item.active {
    background-color: var(--accent);
    color: var(--bg-color);
    font-weight: 600;
}

/* Main Content Area */
.main-content {
    padding: 2rem 3rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.header-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--accent);
    font-size: 1.5rem;
    cursor: pointer;
    margin-right: 1rem;
    z-index: 1100;
}

.search-container {
    position: relative;
    width: 100%;
    max-width: 300px;
}

.search-box {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0.6rem 1rem 0.6rem 1rem;
    padding-right: 2.5rem;
    color: var(--text-main);
    width: 100%;
    outline: none;
    transition: var(--transition);
}

.search-box:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.2);
}

.clear-btn {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-dim);
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
    padding: 4px;
    line-height: 1;
}

.clear-btn:hover {
    color: var(--accent);
}

/* Tool Grid */
.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.tool-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.5rem;
    transition: var(--transition);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.tool-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
    box-shadow: 0 10px 20px -10px rgba(0,0,0,0.5);
}

.tool-card h3 {
    font-size: 1.1rem;
    color: var(--text-main);
}

.tool-card p {
    font-size: 0.85rem;
    color: var(--text-dim);
}

/* Tool Workspace (Dynamic View) */
.workspace {
    display: none;
    animation: fadeIn 0.3s ease-out;
}

.workspace.active {
    display: block;
}

.tool-ui-wrapper {
    max-width: 800px;
    margin: 0 auto;
}

.tool-input {
    width: 100%;
    min-height: 150px;
    background: var(--bg-color);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1rem;
    color: var(--text-main);
    font-family: 'Fira Code', monospace;
    font-size: 0.9rem;
    outline: none;
    transition: var(--transition);
    margin-bottom: 1.5rem;
}

.tool-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.1);
}

.tool-actions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
    width: 100%;
}

.btn-primary {
    background: var(--accent);
    color: var(--bg-color);
    border: none;
    padding: 0.8rem 1.2rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    width: 100%;
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
}

.tool-output {
    background: var(--bg-color);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    color: var(--text-main);
    font-family: 'Fira Code', monospace;
    font-size: 0.9rem;
    white-space: pre-wrap;
    position: relative;
}

.copy-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    background: var(--border);
    color: var(--text-dim);
    font-size: 0.7rem;
    padding: 2px 6px;
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition);
}

.copy-badge:hover {
    background: var(--accent);
    color: var(--bg-color);
}

.back-btn {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    margin-bottom: 2rem;
    transition: var(--transition);
}

.back-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .shell {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: fixed;
        left: -260px;
        top: 0;
        bottom: 0;
        z-index: 1200; /* Increased to cover the mobile-toggle button */
        transition: left 0.3s ease-in-out;
        box-shadow: 10px 0 20px rgba(0,0,0,0.3);
    }

    .sidebar.active {
        left: 0;
    }

    .mobile-toggle {
        display: block;
    }

    .main-content {
        padding: 1.5rem;
    }
}