:root {
    --bg: #0a0d12;
    --panel: rgba(14, 19, 26, 0.86);
    --panel-solid: #0e131a;
    --edge: rgba(140, 170, 200, 0.18);
    --edge-strong: rgba(140, 170, 200, 0.34);
    --text: #d8e2ec;
    --muted: #8b9aab;
    --accent: #63d6ff;
    --danger: #ff7a52;
    --font-main: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
    --nav-h: 2.4rem;
}

*, *::before, *::after { box-sizing: border-box; }

.page-grid {
    background-color: var(--bg);
    background-image:
        linear-gradient(rgba(99, 214, 255, 0.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99, 214, 255, 0.035) 1px, transparent 1px);
    background-size: 22px 22px;
    background-attachment: fixed;
}

.hub-nav, .app-nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 9999;
    height: var(--nav-h);
    display: flex; align-items: center; gap: 1rem;
    padding: 0 1rem;
    background: rgba(10, 13, 18, 0.86);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--edge);
    font-family: var(--font-mono);
    font-size: 0.75rem; letter-spacing: 0.16em; text-transform: uppercase; font-weight: 600;
    color: var(--muted);
}

.hub-nav > span:first-child, .app-nav-brand {
    color: var(--muted);
    font-family: var(--font-mono);
    letter-spacing: 0.16em;
    text-transform: uppercase;
    white-space: nowrap;
}

.hub-nav a, .app-nav-hub {
    color: var(--accent); text-decoration: none;
    font-weight: 600; letter-spacing: 0.1em;
}
.hub-nav a:hover, .app-nav-hub:hover { text-decoration: underline; }
.topbar-right { display: flex; align-items: center; gap: 0.6rem; margin-left: auto; }

.hub-nav .tabs, .app-nav-tabs { display: flex; align-items: center; gap: 0.4rem; }

.auth-widget { display: flex; align-items: center; gap: 0.4rem; }
.auth-widget-btn {
    background: rgba(90, 120, 150, 0.14);
    border: 1px solid var(--edge);
    color: var(--muted);
    font-family: var(--font-main);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: 0.25rem 0.8rem;
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.auth-widget-btn:hover {
    color: var(--text);
    border-color: rgba(99, 214, 255, 0.5);
    background: rgba(99, 214, 255, 0.16);
}
.auth-widget-btn.auth-widget-btn-active {
    background: rgba(99, 214, 255, 0.26);
    border-color: var(--accent);
    color: #eaf9ff;
    font-weight: 600;
    cursor: default;
}
.auth-widget .auth-form { display: flex; align-items: center; gap: 0.4rem; }
.auth-widget .auth-form.auth-hidden { display: none; }
.auth-widget input[type="password"] {
    background: rgba(0, 0, 0, 0.35);
    border: 1px solid var(--edge-strong);
    color: var(--text);
    font-family: var(--font-main);
    font-size: 0.7rem;
    padding: 0.25rem 0.5rem;
    width: 7.5rem;
}
.auth-widget input[type="password"]:focus { outline: 1px solid var(--accent); }
.auth-widget .auth-status { font-size: 0.68rem; color: var(--danger); white-space: nowrap; }
.auth-widget .auth-status.ok { color: var(--accent); }

.app-tab, .hub-nav .tab-btn {
    background: rgba(90, 120, 150, 0.14);
    border: 1px solid var(--edge);
    color: var(--muted);
    font-family: var(--font-main);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: 0.25rem 0.8rem;
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.app-tab:hover:not(:disabled), .hub-nav .tab-btn:hover:not(:disabled) {
    color: var(--text);
    border-color: rgba(99, 214, 255, 0.5);
    background: rgba(99, 214, 255, 0.16);
}
.app-tab.is-active, .hub-nav .tab-btn.active {
    background: rgba(99, 214, 255, 0.26);
    border-color: var(--accent);
    color: #eaf9ff;
    font-weight: 600;
}
.app-tab:disabled, .hub-nav .tab-btn:disabled { opacity: 0.4; cursor: not-allowed; }