:root {
    --bg-primary: #36393f;
    --bg-secondary: #2f3136;
    --bg-tertiary: #202225;
    --bg-sidebar: #2f3136;
    --accent: #5ff5d6;
    --accent-hover: #41c1a7;
    --text-primary: #dcddde;
    --text-secondary: #b9bbbe;
    --text-muted: #72767d;
    --border: #202225;
    --success: #3ba55d;
    --danger: #ed4245;
    --font-display: "Orbitron", sans-serif;
    --font-base: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

body {
    font-family: var(--font-base);
    background: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
}

.app-layout {
    display: flex;
    height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 240px;
    background: var(--bg-sidebar);
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border);
}

.sidebar-header {
    padding: 1.25rem 1rem;
    border-bottom: 1px solid var(--border);
}

.sidebar-logo {
    font-family: var(--font-display);
    font-size: 1.2rem;
    letter-spacing: 0.12em;
    color: var(--text-primary);
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: 1rem 0.5rem;
}

.nav-section {
    margin-bottom: 1.5rem;
}

.nav-section-label {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
    padding: 0 0.5rem;
    margin-bottom: 0.5rem;
    display: block;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 0.75rem;
    border-radius: 4px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.15s;
    margin-bottom: 0.25rem;
}

.nav-item:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

.nav-item.active {
    background: rgba(95, 245, 214, 0.1);
    color: var(--accent);
}

.nav-icon {
    font-size: 1.1rem;
}

.nav-text {
    font-size: 0.95rem;
}

/* User Profile at Bottom */
.sidebar-user {
    padding: 0.75rem;
    background: rgba(0, 0, 0, 0.2);
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex: 1;
    min-width: 0;
}

.user-avatar {
    position: relative;
    width: 32px;
    height: 32px;
    flex-shrink: 0;
}

.user-avatar img,
.avatar-placeholder {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
}

.avatar-placeholder {
    background: var(--accent);
    color: #1a1c20;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
}

.user-status {
    position: absolute;
    bottom: -2px;
    right: -2px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 3px solid var(--bg-sidebar);
}

.user-status.online {
    background: var(--success);
}

.user-details {
    flex: 1;
    min-width: 0;
}

.user-name {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    display: block;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.settings-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.4rem;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
}

.settings-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.content-header {
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border);
}

.page-title {
    font-family: var(--font-display);
    font-size: 2rem;
    letter-spacing: 0.08em;
    color: var(--accent);
    margin-bottom: 0.25rem;
}

.page-subtitle {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Tools Grid */
.tools-grid {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1.5rem;
    align-content: start;
}

.tool-card {
    background: var(--bg-secondary);
    border: 2px solid var(--border);
    border-radius: 16px;
    padding: 2rem 1.5rem;
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 160px;
    position: relative;
    overflow: hidden;
}

.tool-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at center, rgba(95, 245, 214, 0.1), transparent 70%);
    opacity: 0;
    transition: opacity 0.3s;
}

.tool-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(95, 245, 214, 0.2);
}

.tool-card:hover::before {
    opacity: 1;
}

.tool-card-content {
    text-align: center;
    position: relative;
    z-index: 1;
}

.tool-card-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    letter-spacing: 0.02em;
}

.tool-card-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.4;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 1000;
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--bg-secondary);
    border-radius: 8px;
    width: 90%;
    max-width: 600px;
    max-height: 85vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: 0 12px 48px rgba(0, 0, 0, 0.5);
}

.modal-header {
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-header h2 {
    font-size: 1.4rem;
    font-weight: 600;
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 2rem;
    line-height: 1;
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: all 0.15s;
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.modal-body {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
}

.settings-section {
    margin-bottom: 2.5rem;
}

.settings-section:last-child {
    margin-bottom: 0;
}

.settings-section h3 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.settings-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

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

.form-group label {
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

.form-group input {
    background: var(--bg-tertiary);
    border: 1px solid transparent;
    border-radius: 4px;
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: var(--font-base);
    transition: border-color 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent);
}

.form-group input:read-only {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 4px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    font-family: var(--font-base);
}

.btn-primary {
    background: var(--accent);
    color: #1a1c20;
}

.btn-primary:hover {
    background: var(--accent-hover);
}

.btn-danger {
    background: var(--danger);
    color: white;
    display: inline-block;
    text-decoration: none;
    text-align: center;
}

.btn-danger:hover {
    background: #c03537;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

::-webkit-scrollbar-thumb {
    background: rgba(95, 245, 214, 0.3);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(95, 245, 214, 0.5);
}

@media (max-width: 768px) {
    .sidebar {
        width: 200px;
    }
    
    .tools-grid {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
        gap: 1rem;
        padding: 1.5rem;
    }
    
    .tool-card {
        min-height: 140px;
        padding: 1.5rem 1rem;
    }
}