/* ========================================================
   Layout - header + two-column grid
   ======================================================== */

/* --- Header --- */
.app-header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    padding: 0 20px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
}

.app-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: 0.02em;
}

/* --- Main grid --- */
.app-main {
    display: grid;
    grid-template-columns: 1fr 1fr;
    height: calc(100vh - var(--header-height));
    overflow: hidden;
}

/* --- Column shared --- */
.column {
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.column--schedule {
    border-right: var(--column-gap) solid var(--border);
}

.column-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    min-height: 48px;
    flex-shrink: 0;
}

.column-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
}