/* ============================================================
   2D 视图容器与画布
   ============================================================ */
#view2dContainer {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: none;
    z-index: 50;
    overflow: hidden;
    cursor: grab;
    background: transparent;
}

#view2dCanvas {
    position: absolute;
    top: 0;
    left: 0;
    display: block;
    pointer-events: auto;
}

.dragging {
    cursor: grabbing;
}

/* ============================================================
   节点右键菜单
   ============================================================ */
#nodeContextMenu {
    position: absolute;
    background: var(--panel-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--panel-border);
    border-radius: var(--panel-radius);
    padding: 14px 18px;
    z-index: 4000;
    display: none;
    flex-direction: column;
    gap: 12px;
    min-width: 240px;
    box-shadow: var(--panel-shadow);
    color: var(--text-primary);
    font-family: system-ui, 'Segoe UI', sans-serif;
    font-size: 13px;
}

#nodeContextMenu .menu-title {
    font-weight: bold;
    color: var(--accent);
    font-size: 14px;
    border-bottom: 1px solid var(--panel-border);
    padding-bottom: 6px;
    margin-bottom: 4px;
}

.menu-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.menu-row label {
    min-width: 70px;
    color: var(--text-secondary);
}

.menu-row input[type=range] {
    flex: 1;
    margin: 0 8px;
}

.menu-row input[type=color] {
    width: 36px;
    height: 28px;
    border: 1px solid var(--panel-border);
    border-radius: 8px;
    background: transparent;
    cursor: pointer;
}

.menu-row button {
    background: var(--btn-bg);
    border: none;
    color: var(--text-primary);
    padding: 4px 10px;
    border-radius: 16px;
    font-size: 11px;
    cursor: pointer;
    height: 26px;
    width: auto;
    margin: 0;
}

.menu-row button:hover {
    background: var(--btn-hover);
}

.menu-row select {
    background: #07161f;
    border: 1px solid #2c6e7e;
    color: #eef;
    padding: 3px 6px;
    border-radius: 8px;
    font-size: 12px;
    cursor: pointer;
    outline: none;
}

.menu-row select:focus {
    border-color: #0ff;
}

#resetNodeDefaultsBtn {
    background: #4a2c2c;
    margin-top: 4px;
}

#resetNodeDefaultsBtn:hover {
    background: #6e3e3e;
}

/* ============================================================
   移动模式控制栏
   ============================================================ */
#moveControlBar {
    position: absolute;
    bottom: 54px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--panel-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--panel-border);
    border-radius: 40px;
    padding: 10px 24px;
    display: none;
    align-items: center;
    gap: 16px;
    z-index: 500;
    font-family: system-ui, sans-serif;
    box-shadow: var(--panel-shadow);
}

#moveControlBar button {
    background: var(--btn-bg);
    color: var(--text-primary);
    font-weight: bold;
    padding: 8px 18px;
    border-radius: 30px;
    border: none;
    cursor: pointer;
    font-size: 14px;
    height: 36px;
    width: auto;
    margin: 0;
}

#moveControlBar button:hover {
    background: var(--btn-hover);
}

#moveConfirmBtn {
    background: var(--btn-hover);
}

#moveCancelBtn {
    background: rgba(106, 44, 44, 0.8);
}

/* ============================================================
   帮助模态框
   ============================================================ */
.help-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--modal-overlay);
    backdrop-filter: blur(12px);
    z-index: 2000;
    display: none;
    justify-content: center;
    align-items: center;
    font-family: 'Segoe UI', system-ui, sans-serif;
}

.help-modal-content {
    background: rgba(16, 28, 40, 0.98);
    border-radius: var(--panel-radius);
    width: 90vw;
    max-width: 700px;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    border: 1px solid var(--panel-border);
    box-shadow: var(--panel-shadow);
    overflow: hidden;
}

.help-modal-header {
    padding: 12px 20px;
    background: var(--header-bg);
    border-bottom: 1px solid rgba(0, 255, 255, 0.2);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.help-modal-header h2 {
    margin: 0;
    font-size: 1.2rem;
    color: var(--accent);
}

.help-modal-header button {
    background: var(--btn-bg);
    border: none;
    color: var(--text-primary);
    padding: 4px 14px;
    font-size: 13px;
    border-radius: 6px;
    cursor: pointer;
    width: auto;
    height: auto;
    transition: background 0.15s;
}

.help-modal-header button:hover {
    background: var(--btn-hover);
}

.help-modal-body {
    padding: 20px 24px;
    overflow-y: auto;
    color: #c0e0f0;
    line-height: 1.6;
}

.help-modal-body h3 {
    color: #0ff;
    margin: 16px 0 8px;
    font-size: 16px;
}

.help-modal-body ul {
    padding-left: 18px;
    margin-bottom: 8px;
}

.help-modal-body li {
    margin-bottom: 4px;
    font-size: 14px;
}

/* ============================================================
   图层图标按钮
   ============================================================ */
.layer-icon-btn {
    display: none;
    position: fixed;
    top: 46px;
    right: 16px;
    width: 38px;
    height: 38px;
    background: rgba(14, 24, 34, 0.8);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(0, 255, 255, 0.15);
    border-radius: 10px;
    color: #eef;
    font-size: 18px;
    cursor: pointer;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.15s, border-color 0.15s;
}

.layer-icon-btn:hover {
    background: rgba(0, 200, 220, 0.2);
    border-color: rgba(0, 255, 255, 0.4);
}

/* ============================================================
   图层管理浮动面板（编辑器模态框风格）
   ============================================================ */
.layer-panel {
    position: absolute;
    top: 50px;
    right: 10px;
    width: 320px;
    max-height: 60vh;
    background: var(--panel-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--panel-border);
    border-radius: var(--panel-radius);
    display: flex;
    flex-direction: column;
    box-shadow: var(--panel-shadow);
    overflow: hidden;
    z-index: 500;
    font-family: system-ui, 'Segoe UI', sans-serif;
}

.layer-panel-header {
    padding: 10px 12px 10px 14px;
    background: var(--header-bg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
    cursor: move;
    user-select: none;
    min-height: 44px;
}

.layer-panel-drag-handle {
    color: var(--text-secondary);
    font-size: 14px;
    margin-right: 8px;
    flex-shrink: 0;
    opacity: 0.6;
}

.layer-panel-title {
    color: var(--accent);
    font-size: 14px;
    font-weight: 600;
    flex: 1;
}

.layer-panel-header-btns {
    display: flex;
    gap: 6px;
    align-items: center;
}

.layer-header-btn {
    background: rgba(255, 255, 255, 0.06);
    border: none;
    color: var(--text-secondary);
    padding: 5px 12px;
    border-radius: 8px;
    font-size: 12px;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
    font-family: inherit;
    white-space: nowrap;
    display: flex;
    align-items: center;
    justify-content: center;
}

.layer-header-btn:hover {
    background: var(--btn-hover);
    color: var(--text-primary);
}

.layer-ghost-btn {
    width: 30px;
    height: 30px;
    padding: 0;
    border-radius: 8px;
    font-size: 14px;
}

.layer-close-btn {
    width: 30px;
    height: 30px;
    padding: 0;
    border-radius: 8px;
    font-size: 16px;
    line-height: 1;
}

.layer-close-btn:hover {
    background: rgba(196, 43, 28, 0.65) !important;
    color: #fff !important;
}

/* ============================================================
   图层列表
   ============================================================ */
.layer-list {
    overflow-y: auto;
    padding: 8px;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.layer-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: 10px;
    background: rgba(20, 50, 65, 0.3);
    border: 1px solid transparent;
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s, transform 0.15s;
    user-select: none;
}

.layer-item:hover {
    background: rgba(0, 200, 220, 0.15);
    border-color: rgba(0, 255, 255, 0.2);
}

.layer-item.active {
    background: rgba(0, 200, 220, 0.2);
    border-color: #0ff;
    box-shadow: 0 0 12px rgba(0, 255, 255, 0.1);
}

.layer-item.dragging {
    opacity: 0.5;
    background: rgba(0, 200, 220, 0.3);
}

.layer-item.drag-over {
    border-color: #0ff;
    background: rgba(0, 200, 220, 0.25);
    transform: scale(1.02);
}

.layer-drag-handle {
    color: #5a8a9a;
    font-size: 14px;
    cursor: grab;
    padding: 2px;
    flex-shrink: 0;
}

.layer-drag-handle:active {
    cursor: grabbing;
}

.layer-name {
    color: #eef;
    font-size: 14px;
    flex: 1;
    font-weight: 500;
}

.layer-item.active .layer-name {
    color: #0ff;
}

.layer-node-count {
    color: #5a8a9a;
    font-size: 12px;
    flex-shrink: 0;
}

/* ============================================================
   图层右键菜单
   ============================================================ */
.layer-context-menu {
    position: absolute;
    background: var(--panel-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--panel-border);
    border-radius: var(--panel-radius);
    padding: 8px;
    z-index: 9500;
    display: none;
    flex-direction: column;
    gap: 4px;
    min-width: 140px;
    box-shadow: var(--panel-shadow);
}

.layer-menu-btn {
    background: rgba(20, 50, 65, 0.6);
    border: none;
    color: #eef;
    padding: 8px 14px;
    border-radius: 10px;
    font-size: 13px;
    cursor: pointer;
    text-align: left;
    font-family: inherit;
    transition: background 0.15s;
}

.layer-menu-btn:hover {
    background: rgba(0, 200, 220, 0.3);
}

.layer-delete-btn {
    background: rgba(106, 44, 44, 0.6);
}

.layer-delete-btn:hover {
    background: rgba(160, 60, 60, 0.7);
}

/* ============================================================
   图层总览按钮（标题栏内）
   ============================================================ */
.layer-overview-btn {
    background: rgba(0, 180, 200, 0.25);
    border-color: rgba(0, 255, 255, 0.4);
    font-size: 14px;
    padding: 5px 10px;
}

.layer-overview-btn:hover {
    background: rgba(0, 200, 220, 0.45);
    border-color: rgba(0, 255, 255, 0.7);
}

/* ============================================================
   图层总览（全屏 3D 层叠视图）
   ============================================================ */
.layer-overview {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 9000;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    font-family: system-ui, 'Segoe UI', sans-serif;
}

.layer-overview-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at center, rgba(0, 30, 50, 0.95) 0%, rgba(0, 5, 15, 0.98) 70%);
    backdrop-filter: blur(20px);
    animation: overviewBgPulse 6s ease-in-out infinite;
}

@keyframes overviewBgPulse {
    0%, 100% { background: radial-gradient(ellipse at 40% 50%, rgba(0, 40, 60, 0.95), rgba(0, 5, 15, 0.98)); }
    50% { background: radial-gradient(ellipse at 60% 50%, rgba(0, 50, 70, 0.95), rgba(0, 5, 15, 0.98)); }
}

.layer-overview-content {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    height: 100%;
    padding: 120px 200px 20px;
    box-sizing: border-box;
    overflow-y: auto;
}

.layer-overview-title {
    color: #0ff;
    font-size: 24px;
    font-weight: bold;
    letter-spacing: 4px;
    text-shadow: 0 0 20px rgba(0, 255, 255, 0.4);
    margin-bottom: 8px;
    flex-shrink: 0;
}

.layer-overview-hint {
    color: rgba(180, 210, 230, 0.5);
    font-size: 13px;
    margin-bottom: 36px;
    flex-shrink: 0;
}

.layer-overview-esc {
    color: rgba(255, 200, 100, 0.6);
}

/* ============================================================
   侧面微俯视叠纸卡片 - 全息投影
   ============================================================ */
.layer-overview-cards {
    position: relative;
    width: 840px;
    max-width: 92vw;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 10px 200px;
    overflow: visible;
    /* 3D 透视空间 */
    perspective: 800px;
    perspective-origin: 50% 50%;
}

/* ---------- 单行：纸片 + 侧标签 ---------- */
.layer-paper-row {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    margin-top: -28px;
    transition: margin-top 0.3s ease, transform 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    position: relative;
    flex-shrink: 0;
}

.layer-paper-row:first-child {
    margin-top: 0;
}

/* 拖拽中的源行：半透明 */
.layer-paper-row.dragging {
    opacity: 0.4;
}

/* 悬停目标行：高亮 */
.layer-paper-row.drag-over .layer-card {
    border-color: rgba(0, 255, 255, 0.9);
    border-bottom-color: rgba(0, 255, 255, 0.8);
    box-shadow:
        0 0 14px rgba(0, 255, 255, 0.4),
        0 0 30px rgba(0, 200, 255, 0.25),
        0 0 50px rgba(0, 180, 240, 0.15),
        inset 0 0 40px rgba(0, 255, 255, 0.12);
}

/* 占位间隙 */
.layer-paper-row-gap {
    height: 100px;
    flex-shrink: 0;
}

/* ---------- 纸片本身（全息投影 60° 斜切 + 顺时针微倾） ---------- */
.layer-card {
    position: relative;
    width: 440px;
    max-width: 60vw;
    height: 100px;
    border-radius: 3px;
    cursor: pointer;
    user-select: none;
    flex-shrink: 0;
    /* 60° 斜切长斜边 + 顺时针微倾，左下角指向层数标签 */
    transform: rotateZ(5deg) rotateX(14deg) rotateY(0deg) skewX(-60deg);
    transform-style: preserve-3d;
    transition: transform 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                box-shadow 0.35s ease,
                border-color 0.35s ease,
                background 0.35s ease;
    /* 全息投影：半透明底色 + 扫描线 */
    background:
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 1px,
            rgba(0, 255, 255, 0.03) 1px,
            rgba(0, 255, 255, 0.03) 2px
        ),
        linear-gradient(170deg,
            rgba(0, 40, 60, 0.35) 0%,
            rgba(0, 60, 80, 0.38) 40%,
            rgba(0, 50, 70, 0.36) 60%,
            rgba(0, 30, 50, 0.33) 100%);
    border: 1px solid rgba(0, 200, 240, 0.28);
    border-bottom: 2px solid rgba(0, 150, 200, 0.25);
    box-shadow:
        0 0 8px rgba(0, 180, 220, 0.12),
        0 0 20px rgba(0, 150, 200, 0.08),
        inset 0 0 30px rgba(0, 255, 255, 0.04);
    background-size: auto, auto;
    backdrop-filter: blur(2px);
}

/* 纸片厚度 —— 底面伪元素 */
.layer-card::after {
    content: '';
    position: absolute;
    left: -1px;
    right: -1px;
    bottom: -4px;
    height: 4px;
    background: linear-gradient(to bottom,
        rgba(0, 100, 140, 0.45),
        rgba(0, 60, 90, 0.35));
    border-radius: 0 0 3px 3px;
    border: 1px solid rgba(0, 200, 240, 0.15);
    border-top: none;
    transform: rotateX(-90deg);
    transform-origin: top center;
}

/* ---------- 悬停：整片高亮发光 ---------- */
.layer-card:hover {
    transform: rotateZ(5deg) rotateX(10deg) rotateY(-3deg) skewX(-60deg) translateY(-6px) scale(1.03);
    border-color: rgba(0, 255, 255, 0.7);
    border-bottom-color: rgba(0, 240, 255, 0.6);
    background:
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 1px,
            rgba(0, 255, 255, 0.06) 1px,
            rgba(0, 255, 255, 0.06) 2px
        ),
        linear-gradient(170deg,
            rgba(0, 80, 110, 0.55) 0%,
            rgba(0, 120, 160, 0.6) 40%,
            rgba(0, 100, 140, 0.55) 60%,
            rgba(0, 60, 90, 0.5) 100%);
    box-shadow:
        0 0 14px rgba(0, 255, 255, 0.3),
        0 0 30px rgba(0, 200, 255, 0.2),
        0 0 50px rgba(0, 180, 240, 0.15),
        inset 0 0 40px rgba(0, 255, 255, 0.1);
}

/* ---------- 当前图层：更亮发光边框 ---------- */
.layer-card.active {
    border-color: rgba(0, 255, 255, 0.7);
    border-bottom-color: rgba(0, 255, 255, 0.55);
    background:
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 1px,
            rgba(0, 255, 255, 0.04) 1px,
            rgba(0, 255, 255, 0.04) 2px
        ),
        linear-gradient(170deg,
            rgba(0, 60, 90, 0.45) 0%,
            rgba(0, 90, 120, 0.5) 40%,
            rgba(0, 70, 100, 0.48) 60%,
            rgba(0, 40, 60, 0.42) 100%);
    box-shadow:
        0 0 10px rgba(0, 255, 255, 0.2),
        0 0 25px rgba(0, 220, 255, 0.15),
        0 0 45px rgba(0, 200, 240, 0.1),
        0 0 0 2px rgba(0, 255, 255, 0.12),
        inset 0 0 35px rgba(0, 255, 255, 0.06);
}

/* ---------- 纸片内部：空白（留作视觉留白） ---------- */
.layer-card-inner {
    display: none;
}

/* ---------- 金色节点亮点 ---------- */
.layer-card-dot {
    position: absolute;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: radial-gradient(circle at 35% 35%, #ffe680, #d4a000);
    box-shadow: 0 0 4px rgba(255, 200, 50, 0.6), 0 0 8px rgba(255, 180, 0, 0.3);
    pointer-events: none;
    animation: dotPulse 2.5s ease-in-out infinite;
}

@keyframes dotPulse {
    0%, 100% { opacity: 0.5; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.2); }
}

/* ---------- 侧边标签 ---------- */
.layer-paper-label {
    position: absolute;
    right: calc(50% + 400px);
    padding-top: 4px;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 30px;
    white-space: nowrap;
}

.layer-label-index {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 1px;
    opacity: 0.6;
    text-transform: uppercase;
}

.layer-label-name {
    font-size: 16px;
    font-weight: 600;
    color: #dde;
    letter-spacing: 1px;
    transition: color 0.25s;
}

.layer-card:hover ~ .layer-paper-label .layer-label-name,
.layer-paper-row:hover .layer-label-name {
    color: #0ff;
}

.layer-card.active ~ .layer-paper-label .layer-label-name {
    color: #0ff;
    text-shadow: 0 0 10px rgba(0, 255, 255, 0.2);
}

.layer-label-meta {
    display: flex;
    gap: 12px;
    color: rgba(160, 190, 210, 0.45);
    font-size: 12px;
    transition: color 0.25s;
}

.layer-card:hover ~ .layer-paper-label .layer-label-meta,
.layer-paper-row:hover .layer-label-meta {
    color: rgba(180, 210, 230, 0.75);
}

.layer-card.active ~ .layer-paper-label .layer-label-meta {
    color: rgba(0, 255, 255, 0.5);
}

.layer-label-current {
    font-size: 11px;
    padding: 1px 8px;
    border-radius: 8px;
    background: rgba(0, 255, 255, 0.12);
    color: #0ff;
    font-weight: 600;
    letter-spacing: 0.5px;
}