.board-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    border-bottom: 1px solid var(--color-border);
    flex-shrink: 0;
}

.board-toolbar-title {
    font-size: 17px;
    font-weight: 700;
}

.board-invite-btn {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 8px 14px;
    background: var(--tg-btn);
    color: var(--tg-btn-text);
    border-radius: 10px;
    font-size: 14px;
    font-weight: 600;
}

.board-invite-btn:active {
    opacity: 0.8;
}

.board {
    display: flex;
    flex: 1;
    overflow-x: auto;
    overflow-y: hidden;
    gap: 12px;
    padding: 12px;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
}

.column {
    flex: 0 0 85vw;
    max-width: 400px;
    display: flex;
    flex-direction: column;
    background: var(--color-column-bg);
    border-radius: 16px;
    overflow: hidden;
    scroll-snap-align: start;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.column.drop-target {
    transform: scale(1.02);
    box-shadow: 0 0 0 2px var(--tg-link);
}

.column-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 16px;
    border-bottom: 1px solid var(--color-border);
    flex-shrink: 0;
}

.column-header-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 15px;
    font-weight: 600;
}

.column-header-icon {
    font-size: 18px;
    line-height: 1;
}

.column-header-count {
    background: color-mix(in srgb, var(--tg-text) 12%, transparent);
    border-radius: 10px;
    padding: 2px 10px;
    font-size: 13px;
    font-weight: 500;
    color: var(--tg-hint);
}

.column-header-accent {
    width: 3px;
    height: 24px;
    border-radius: 2px;
    flex-shrink: 0;
}

.column-header-accent.todo { background: var(--color-todo-accent); }
.column-header-accent.progress { background: var(--color-progress-accent); }
.column-header-accent.done { background: var(--color-done-accent); }

.column-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    -webkit-overflow-scrolling: touch;
}

.column-list-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 32px 16px;
    color: var(--tg-hint);
    font-size: 14px;
    text-align: center;
    gap: 6px;
}

.column-list-empty-icon {
    font-size: 28px;
    opacity: 0.4;
    margin-bottom: 4px;
}

@media (min-width: 768px) {
    .board {
        padding: 16px;
        gap: 16px;
        justify-content: center;
    }

    .column {
        flex: 1 1 0;
        max-width: 380px;
        min-width: 0;
    }
}

.loading-overlay {
    position: fixed;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--tg-bg);
    z-index: 1000;
    gap: 16px;
}

.loading-spinner {
    width: 36px;
    height: 36px;
    border: 3px solid var(--color-border);
    border-top-color: var(--tg-link);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-text {
    font-size: 15px;
    color: var(--tg-hint);
    font-weight: 500;
}

.error-screen {
    position: fixed;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--tg-bg);
    z-index: 1000;
    padding: 32px;
    gap: 16px;
    text-align: center;
}

.error-screen-icon {
    font-size: 48px;
    margin-bottom: 8px;
}

.error-screen-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--tg-text);
}

.error-screen-text {
    font-size: 14px;
    color: var(--tg-hint);
    max-width: 280px;
}

.error-screen button {
    background: var(--tg-btn);
    color: var(--tg-btn-text);
    padding: 10px 32px;
    border-radius: 10px;
    font-weight: 600;
    font-size: 15px;
    margin-top: 8px;
}