/* Site header */
.site-header {
    background: var(--color-header-bg);
    color: white;
    padding: 0.8rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.site-header-brand {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
    color: white;
}

.site-header-brand h1 {
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.site-header nav {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.site-header nav a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    transition: color 0.2s;
}

.site-header nav a:hover,
.site-header nav a.active {
    color: white;
}

.site-header nav a.active {
    border-bottom: 2px solid var(--color-accent);
    padding-bottom: 2px;
}

/* Tool header */
.tool-header {
    background: var(--color-header-bg);
    color: white;
    padding: 0.8rem 2rem;
    text-align: center;
}

.tool-header h2 { font-size: 1.2rem; font-weight: 600; }
.tool-header p { font-size: 0.82rem; opacity: 0.7; margin-top: 0.2rem; }

/* App grid layout */
.app {
    max-width: 1200px;
    margin: 1.5rem auto;
    padding: 0 1.5rem;
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 1.5rem;
    align-items: start;
    flex: 1;
}

/* Mode tabs */
.mode-tabs {
    max-width: 1200px;
    margin: 1.5rem auto 0;
    padding: 0 1.5rem;
    display: flex;
    gap: 0.25rem;
}

.mode-tab {
    padding: 0.6rem 1.2rem;
    border: none;
    background: #ddd;
    color: var(--color-text-muted);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: 8px 8px 0 0;
    transition: background 0.2s, color 0.2s;
}

.mode-tab:hover { background: #ccc; }
.mode-tab.active { background: white; color: var(--color-header-bg); }

/* Site footer */
.site-footer {
    background: var(--color-header-bg);
    color: rgba(255, 255, 255, 0.6);
    padding: 1.2rem 2rem;
    text-align: center;
    font-size: 0.8rem;
    margin-top: auto;
}

.site-footer a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
}

.site-footer a:hover { color: white; }

.site-footer .footer-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 0.5rem;
}

.site-footer .footer-note {
    font-size: 0.75rem;
    opacity: 0.7;
}

/* Font row */
.font-row {
    display: flex;
    gap: 0.5rem;
}

.font-row select { flex: 2; }
.font-row input[type="number"] { flex: 1; min-width: 0; }

@media (max-width: 768px) {
    .app { grid-template-columns: 1fr; }
    .mode-tabs { flex-wrap: wrap; }
    .site-header { flex-wrap: wrap; justify-content: center; }
}