:root {
    --bg: #f4f6f9;
    --surface: #ffffff;
    --text: #1a1d29;
    --text-muted: #5b6472;
    --accent: #4285F4;
    --accent-dark: #2e5fc7;
    --border: #e6e9ef;
    --hero-from: #14192b;
    --hero-to: #232a45;
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Montserrat', Arial, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    margin: 0;
}

.app-topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 16px 24px;
    background: var(--hero-from);
    color: #fff;
}

.app-topbar .brand {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: #fff;
    font-weight: 700;
    font-size: 0.95em;
}

.app-topbar .right {
    display: flex;
    align-items: center;
    gap: 10px;
}

.install-btn {
    border: 1px solid rgba(255, 255, 255, 0.4);
    background: transparent;
    color: #fff;
    font-size: 0.78em;
    font-weight: 700;
    padding: 6px 14px;
    border-radius: 999px;
    cursor: pointer;
    transition: background 0.15s ease;
}

.install-btn:hover {
    background: rgba(255, 255, 255, 0.12);
}

.lang-toggle {
    display: inline-flex;
    background: rgba(255, 255, 255, 0.12);
    border-radius: 999px;
    padding: 3px;
    gap: 2px;
    flex-shrink: 0;
}

.lang-toggle button {
    border: none;
    background: transparent;
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.78em;
    font-weight: 700;
    padding: 5px 12px;
    border-radius: 999px;
    cursor: pointer;
    transition: background 0.15s ease, color 0.15s ease;
}

.lang-toggle button.active {
    background: #fff;
    color: var(--hero-from);
}

.app-footer {
    text-align: center;
    padding: 24px;
    font-size: 0.85em;
    color: var(--text-muted);
}

.app-footer a {
    color: var(--accent-dark);
    text-decoration: none;
    font-weight: 600;
}

.app-footer a:hover {
    text-decoration: underline;
}