/*
 * Shared design tokens + top bar (templates/fragments/topbar.html).
 * Neutral palette: near-black text and buttons on white / light gray.
 * Color is only used for meaning (correct = green, wrong = red).
 */

:root {
    --brand: #18181b;
    --brand-dark: #3f3f46;
    --brand-soft: #f4f4f5;
    --text: #18181b;
    --muted: #71717a;
    --border: #e4e4e7;
    --surface: #ffffff;
    --bg: #fafafa;
    --ok: #15803d;
    --ok-soft: #f0fdf4;
    --error: #b91c1c;
    --error-soft: #fef2f2;
    --radius: 10px;
    --font: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --mono: 'Consolas', 'SFMono-Regular', 'Courier New', monospace;
    --topbar-height: 60px;
}

.topbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    height: var(--topbar-height);
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    background-color: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
    font-family: var(--font);
    box-sizing: border-box;
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: 28px;
    min-width: 0;
}

.topbar-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
    font-size: 18px;
    font-weight: 700;
    letter-spacing: -0.01em;
    text-decoration: none;
}

.topbar-logo-icon {
    display: grid;
    place-items: center;
    width: 30px;
    height: 30px;
    border-radius: 8px;
    background-color: var(--brand);
    color: #fff;
    font-size: 16px;
}

.topbar-nav {
    display: flex;
    gap: 4px;
}

.topbar-nav a {
    padding: 7px 12px;
    border-radius: 8px;
    color: var(--muted);
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
}

.topbar-nav a:hover {
    color: var(--text);
    background-color: var(--brand-soft);
}

.topbar-nav a.active {
    color: var(--text);
    background-color: var(--brand-soft);
    font-weight: 600;
}

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

.lang-switch {
    display: flex;
    padding: 3px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background-color: var(--bg);
}

.lang-switch a {
    padding: 4px 9px;
    border-radius: 6px;
    color: var(--muted);
    font-size: 12px;
    font-weight: 600;
    text-decoration: none;
}

.lang-switch a:hover {
    color: var(--text);
}

.lang-switch a.active {
    background-color: var(--surface);
    color: var(--text);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.topbar-btn {
    display: inline-block;
    padding: 8px 14px;
    border: 1px solid transparent;
    border-radius: 8px;
    font: inherit;
    font-size: 14px;
    font-weight: 600;
    line-height: 1.2;
    text-decoration: none;
    white-space: nowrap;
    cursor: pointer;
    transition: background-color 0.15s ease, border-color 0.15s ease;
}

.topbar-btn-ghost {
    background-color: var(--surface);
    border-color: var(--border);
    color: var(--text);
}

.topbar-btn-ghost:hover {
    border-color: #a1a1aa;
}

.topbar-btn-primary {
    background-color: var(--brand);
    color: #fff;
}

.topbar-btn-primary:hover {
    background-color: var(--brand-dark);
}

.topbar-logout {
    margin: 0;
}

.topbar a:focus-visible,
.topbar button:focus-visible {
    outline: 2px solid var(--text);
    outline-offset: 2px;
}

@media (max-width: 640px) {
    .topbar {
        padding: 0 12px;
        gap: 8px;
    }

    .topbar-left {
        gap: 8px;
    }

    .topbar-logo-text {
        display: none;
    }

    .topbar-nav a {
        padding: 6px 8px;
        font-size: 13px;
    }

    .topbar-actions {
        gap: 6px;
    }

    .topbar-btn {
        padding: 7px 10px;
        font-size: 13px;
    }
}