:root {
    --bg-main: #09090b;
    --bg-sidebar: #111114;
    --bg-surface: #17171b;
    --border-color: rgba(255, 255, 255, 0.08);
    --border-strong: rgba(255, 255, 255, 0.12);
    --accent: #6366f1;
    --accent-soft: rgba(99, 102, 241, 0.16);
    --text-main: #f4f4f5;
    --text-muted: #a1a1aa;
    --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.24);
    --sidebar-width: 240px;
    --sidebar-collapsed-width: 72px;
    --radius-md: 8px;
    --radius-lg: 12px;
}

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

body {
    font-family: Inter, "Segoe UI", Roboto, "Helvetica Neue", Arial, system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    background: radial-gradient(circle at top left, rgba(99, 102, 241, 0.16), transparent 30%), var(--bg-main);
    color: var(--text-main);
    display: flex;
    min-height: 100vh;
    overflow-x: hidden;
}

.sidebar {
    width: var(--sidebar-width);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.01));
    display: flex;
    flex-direction: column;
    transition: width 0.35s ease-in-out;
    border-right: 1px solid var(--border-color);
    flex-shrink: 0;
    box-shadow: var(--shadow-soft);
}

.sidebar-header {
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    height: 70px;
}

.brand-text {
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    transition: opacity 0.25s ease-in-out;
}

.toggle-btn {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    font-size: 1rem;
    cursor: pointer;
    padding: 7px 8px;
    border-radius: var(--radius-md);
    transition: transform 0.2s ease-in-out, background-color 0.2s ease-in-out, border-color 0.2s ease-in-out;
}

.toggle-btn:hover {
    background: var(--accent-soft);
    border-color: var(--accent);
    transform: translateY(-1px);
}

.nav-links {
    list-style: none;
    padding: 16px 12px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.nav-links li a {
    display: flex;
    align-items: center;
    padding: 11px 12px;
    color: var(--text-muted);
    text-decoration: none;
    transition: all 0.25s ease-in-out;
    white-space: nowrap;
    border-radius: var(--radius-md);
    position: relative;
}

.nav-links li a:hover,
.nav-links li a.active {
    color: var(--text-main);
    background: linear-gradient(90deg, rgba(99, 102, 241, 0.16), rgba(99, 102, 241, 0.08));
    border-left: 3px solid var(--accent);
    transform: translateX(2px);
}

.nav-links .icon {
    margin-right: 12px;
    width: 20px;
    text-align: center;
    color: var(--accent);
    transition: transform 0.25s ease-in-out;
}

.nav-links li a:hover .icon,
.nav-links li a.active .icon {
    transform: scale(1.05);
}

.sidebar.collapsed {
    width: var(--sidebar-collapsed-width);
}

.sidebar.collapsed .brand-text,
.sidebar.collapsed .link-text {
    opacity: 0;
    pointer-events: none;
    max-width: 0;
    overflow: hidden;
}

.sidebar.collapsed .nav-links li a {
    padding: 12px 10px;
    justify-content: center;
}

.sidebar.collapsed .icon {
    margin-right: 0;
}

.content {
    flex-grow: 1;
    padding: 32px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.top-bar {
    margin-bottom: 6px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 16px;
}

.top-bar h1 {
    font-size: clamp(1.5rem, 2.1vw, 2rem);
    font-weight: 700;
    letter-spacing: -0.03em;
}

.dashboard-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}

.card {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.015));
    padding: 24px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    max-width: 640px;
    box-shadow: var(--shadow-soft);
    transition: transform 0.25s ease-in-out, border-color 0.25s ease-in-out;
}

.card:hover {
    transform: translateY(-2px);
    border-color: var(--border-strong);
}

.card h3 {
    margin-bottom: 10px;
    font-size: 1.1rem;
    font-weight: 600;
}

.card p {
    color: var(--text-muted);
    line-height: 1.6;
}