:root {
    --md3-radius-sm: 8px;
    --md3-radius-md: 16px;
    --md3-radius-lg: 24px;
    --md3-shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.15);
    --md3-shadow-md: 0 8px 24px rgba(0, 0, 0, 0.2);
    --md3-shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.25);
}

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

body {
    font-family: 'Segoe UI', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background: var(--bg-primary, #000000);
    color: var(--text-primary, #ffffff);
    line-height: 1.5;
}

#app {
    min-height: 100vh;
    display: flex;
    background: var(--bg-primary, #000000);
}

.shell {
    display: flex;
    width: 100%;
}

.sidebar {
    width: 280px;
    background: var(--bg-secondary, #0d0d0d);
    border-right: 1px solid var(--border, #2a2a2a);
    padding: 24px;
}

.main {
    flex: 1;
    padding: var(--container-padding, 16px);
}

.card {
    background: var(--surface, #1a1a1a);
    border-radius: var(--md3-radius-md);
    box-shadow: var(--shadow, var(--md3-shadow-sm));
    padding: 16px;
}

.button {
    border: none;
    border-radius: var(--md3-radius-sm);
    padding: 12px 16px;
    background: var(--primary, #8b0000);
    color: var(--text-primary, #ffffff);
    cursor: pointer;
}

.button:active {
    transform: scale(0.98);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--md3-radius-sm);
    color: var(--text-secondary, #b0b0b0);
    cursor: pointer;
}

.nav-item.active {
    background: var(--bg-tertiary, #1a1a1a);
    color: var(--text-primary, #ffffff);
}

.input {
    width: 100%;
    padding: 12px 16px;
    border-radius: var(--md3-radius-sm);
    border: 1px solid var(--border, #2a2a2a);
    background: transparent;
    color: inherit;
}