/* ============================================
   Chinese Master - Bottom Sheet
   iOS-style sheet with swipe-dismiss + grabber
   ============================================ */

/* --- Sheet Root (portal) --- */
#sheet-root {
    position: fixed;
    inset: 0;
    z-index: 500;
    pointer-events: none;
}

#sheet-root[aria-hidden="false"] {
    pointer-events: auto;
}

/* --- Backdrop --- */
.sheet-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 0;
}

#sheet-root[aria-hidden="false"] .sheet-backdrop {
    opacity: 1;
}

/* --- Sheet Panel --- */
.sheet-panel {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    max-height: 70vh;
    max-height: 70dvh;
    background: var(--bg-card);
    border-radius: 20px 20px 0 0;
    transform: translateY(100%);
    transition: transform 0.34s cubic-bezier(0.32, 0.72, 0, 1);
    z-index: 1;
    overflow-y: auto;
    padding-bottom: calc(16px + env(safe-area-inset-bottom, 0px));
    display: flex;
    flex-direction: column;
    -webkit-overflow-scrolling: touch;
}

#sheet-root[aria-hidden="false"] .sheet-panel {
    transform: translateY(0);
}

/* --- Grabber Handle --- */
.sheet-grabber {
    display: flex;
    justify-content: center;
    padding: 12px 0 8px;
    cursor: grab;
    flex-shrink: 0;
}

.sheet-grabber::after {
    content: '';
    width: 36px;
    height: 5px;
    background: rgba(148, 163, 184, 0.3);
    border-radius: 3px;
    transition: background 0.2s ease;
}

.sheet-grabber:hover::after,
.sheet-grabber:active::after {
    background: rgba(148, 163, 184, 0.5);
}

/* --- Sheet Header --- */
.sheet-header {
    padding: 0 20px 12px;
    border-bottom: 1px solid var(--glass-border);
    flex-shrink: 0;
}

.sheet-header h2 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.sheet-header p {
    font-size: 13px;
    color: var(--text-muted);
    margin: 4px 0 0;
}

/* --- Sheet Body --- */
.sheet-body {
    padding: 12px 8px;
    flex: 1;
}

/* --- Sheet Row (menu item) --- */
.sheet-row {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 20px;
    color: var(--text-primary);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    border-radius: 12px;
    margin: 2px 8px;
    transition: background 0.15s ease, transform 0.1s ease;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    text-decoration: none;
    background: none;
    border: none;
    width: calc(100% - 16px);
    font-family: var(--font-en);
    text-align: left;
}

.sheet-row:active {
    background: var(--bg-hover);
    transform: scale(0.98);
}

.sheet-row:focus-visible {
    outline: 2px solid #f1c40f;
    outline-offset: -2px;
}

.sheet-row-icon {
    font-size: 20px;
    width: 28px;
    text-align: center;
    flex-shrink: 0;
}

.sheet-row-icon svg {
    width: 20px;
    height: 20px;
    stroke: currentColor;
    fill: none;
}

.sheet-row-label {
    flex: 1;
}

.sheet-row-arrow {
    color: var(--text-muted);
    font-size: 16px;
    flex-shrink: 0;
}

/* --- Sheet Danger row --- */
.sheet-row.danger {
    color: var(--color-danger);
}

/* --- Sheet divider --- */
.sheet-divider {
    height: 1px;
    background: var(--glass-border);
    margin: 6px 16px;
}

/* --- Sheet nested / sub-section label --- */
.sheet-section-label {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    padding: 8px 20px 4px;
}

@media (prefers-reduced-motion: reduce) {
    .sheet-panel {
        transition: none;
    }

    .sheet-backdrop {
        transition: none;
    }
}