*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
}
a { color: var(--accent-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4, h5, h6 { font-family: var(--font-mono); font-weight: 600; margin: 0 0 12px; color: var(--text-primary); }

.app-shell {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    min-height: 100vh;
}

.app-sidebar {
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-primary);
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 0;
    height: 100vh;
}
.app-sidebar__brand {
    padding: 20px 20px 24px;
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 1px solid var(--border-secondary);
}
.brand-mark {
    color: var(--accent-primary);
    font-size: 20px;
    text-shadow: 0 0 10px var(--accent-primary);
}
.brand-name {
    font-weight: 700;
    letter-spacing: 2px;
    font-size: 14px;
    color: var(--text-primary);
}
.app-sidebar__nav { flex: 1; padding: 16px 10px; display: flex; flex-direction: column; gap: 2px; }
.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 12px;
    letter-spacing: 0.5px;
    transition: background var(--transition-fast), color var(--transition-fast);
}
.nav-item:hover { background: var(--bg-hover); color: var(--text-primary); text-decoration: none; }
.nav-item.is-active { background: var(--accent-primary-dim); color: var(--accent-primary); border: 1px solid var(--accent-primary-border); padding: 9px 11px; }
.nav-item__icon { display: inline-flex; width: 16px; height: 16px; align-items: center; }
.nav-item__label { flex: 1; }
.nav-item__shortcut { font-size: 10px; color: var(--text-muted); border: 1px solid var(--border-primary); padding: 1px 5px; border-radius: var(--radius-sm); }
.app-sidebar__footer { padding: 12px 20px; border-top: 1px solid var(--border-secondary); color: var(--text-muted); font-size: 10px; letter-spacing: 1px; }

.app-main { display: flex; flex-direction: column; min-width: 0; }
.app-header {
    height: var(--header-height);
    border-bottom: 1px solid var(--border-primary);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    background: var(--bg-secondary);
    position: sticky;
    top: 0;
    z-index: 5;
}
.app-header__title { font-size: 13px; font-weight: 600; letter-spacing: 1.5px; text-transform: uppercase; color: var(--text-primary); }
.app-header__actions { display: flex; gap: 8px; align-items: center; }

.app-content { padding: 28px 24px 64px; max-width: var(--content-max); width: 100%; margin: 0 auto; flex: 1; }

.page__header { display: flex; flex-direction: column; gap: 4px; margin-bottom: 20px; position: relative; }
.page__title { font-size: 22px; font-weight: 700; letter-spacing: -0.5px; color: var(--text-primary); margin: 0; }
.page__subtitle { color: var(--text-tertiary); font-size: 12px; margin: 0; }
.page__header > button { position: absolute; right: 0; top: 0; }

.grid-2 { display: grid; gap: 16px; grid-template-columns: 1fr 1fr; }
.row-gap { display: flex; gap: 8px; }
.row-gap > * { flex: 1; }

@media (max-width: 900px) {
    .app-shell { grid-template-columns: 56px 1fr; }
    .app-sidebar { width: 56px; }
    .nav-item__label, .nav-item__shortcut, .app-sidebar__footer, .brand-name { display: none; }
    .app-sidebar__brand { justify-content: center; padding: 16px 0; }
    .grid-2 { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
    .app-content { padding: 16px; }
    .app-header { padding: 0 12px; }
}