/* 白板（手写板/触控笔）页面样式，复用站内设计令牌。 */

/* ── 页面骨架：白板独占视口，隐藏常规页脚与顶部留白 ── */
.wb-body { overflow: hidden; }
.wb-body .top-spacer,
.wb-body #app-footer,
.wb-body .scroll-to-top { display: none !important; }
.wb-body #app-main { padding: 0 !important; }

.wb {
    --wb-paper: #ffffff;
    --wb-line: rgba(0, 0, 0, 0.07);
    --wb-dot: rgba(0, 0, 0, 0.16);
    --wb-panel: rgba(255, 255, 255, 0.82);
    --wb-panel-border: rgba(0, 0, 0, 0.08);

    position: relative;
    width: 100%;
    height: calc(100vh - var(--nav-h));
    height: calc(100dvh - var(--nav-h));
    overflow: hidden;
    touch-action: none;
    user-select: none;
    -webkit-user-select: none;
}

[data-mode="dark"] .wb {
    --wb-paper: #15161a;
    --wb-line: rgba(255, 255, 255, 0.07);
    --wb-dot: rgba(255, 255, 255, 0.18);
    --wb-panel: rgba(28, 28, 32, 0.82);
    --wb-panel-border: rgba(255, 255, 255, 0.10);
}

/* ── 舞台 ── */
.wb-stage {
    position: absolute;
    inset: 0;
}

.wb-paper {
    --wb-g: 32px;
    --wb-ox: 0px;
    --wb-oy: 0px;
    position: absolute;
    inset: 0;
    background-color: var(--wb-paper);
    background-repeat: repeat;
    background-size: var(--wb-g) var(--wb-g);
    background-position: var(--wb-ox) var(--wb-oy);
    transition: background-color var(--dur-base) ease;
}
.wb-paper[data-bg="blank"] { background-image: none; }
.wb-paper[data-bg="grid"] {
    background-image:
        linear-gradient(to right, var(--wb-line) 1px, transparent 1px),
        linear-gradient(to bottom, var(--wb-line) 1px, transparent 1px);
}
.wb-paper[data-bg="dots"] {
    background-image: radial-gradient(var(--wb-dot) 1.4px, transparent 1.5px);
}
.wb-paper[data-bg="lines"] {
    background-image: linear-gradient(to bottom, var(--wb-line) 1px, transparent 1px);
}

.wb-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
    touch-action: none;
    cursor: crosshair;
}
.wb[data-active-tool="hand"] .wb-canvas { cursor: grab; }
.wb[data-active-tool="text"] .wb-canvas { cursor: text; }
.wb[data-panning="1"] .wb-canvas { cursor: grabbing; }
.wb[data-ring="1"] .wb-canvas { cursor: none; }

/* 文字工具的就地输入框：视觉上与最终落在画布上的文字一致 */
.wb-text-input {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 3;
    min-width: 2ch;
    margin: 0;
    padding: 0;
    border: none;
    outline: none;
    resize: none;
    overflow: hidden;
    white-space: pre;
    background: transparent;
    caret-color: var(--brand);
    box-shadow: 0 0 0 1px var(--brand-soft), 0 0 0 2px var(--brand);
    border-radius: 3px;
    user-select: text;
    -webkit-user-select: text;
}

/* 笔尖大小指示环（仅精确指针设备显示） */
.wb-ring {
    position: absolute;
    top: 0;
    left: 0;
    border-radius: 50%;
    border: 1px solid var(--text-secondary);
    box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.35) inset;
    pointer-events: none;
    will-change: transform;
    z-index: 2;
}
.wb-ring--eraser { border-style: dashed; }

/* ── 浮层通用外观 ──
   浮在画布之上，靠一条 hairline + 背景模糊读出层次，不再用投影。 */
.wb-bar,
.wb-zoom,
.wb-hud,
.wb-menu-panel {
    background: var(--wb-panel);
    border: 1px solid var(--rule-strong);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
}

.wb-bar {
    position: absolute;
    top: 14px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    /* 用换行而不是横向滚动：滚动容器会把下拉面板裁掉 */
    flex-wrap: wrap;
    gap: 4px 4px;
    max-width: calc(100% - 24px);
    padding: 6px 8px;
    border-radius: var(--radius-pill);
}

.wb-group { display: flex; align-items: center; gap: 2px; }

.wb-sep {
    width: 1px;
    height: 20px;
    margin: 0 6px;
    background: var(--rule);
    flex-shrink: 0;
}

.wb-btn {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    width: 34px;
    height: 34px;
    padding: 0;
    border: 1px solid transparent;
    border-radius: var(--radius-pill);
    background: transparent;
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1;
    cursor: pointer;
    transition: border-color var(--dur-fast) ease, color var(--dur-fast) ease,
                background var(--dur-fast) ease,
                transform var(--dur-fast) var(--ease-apple);
}
.wb-btn:hover:not(:disabled) { border-color: var(--rule-strong); color: var(--text-primary); }
.wb-btn:active:not(:disabled) { transform: scale(0.92); }
.wb-btn:disabled { opacity: 0.32; cursor: default; }
/* 选中态用墨色实心，和 .tag-chip.active / .pill--solid 是同一个读法 */
.wb-btn.is-on {
    background: var(--text-primary);
    border-color: var(--text-primary);
    color: var(--bg-body);
}
.wb-btn.is-on:hover {
    background: var(--brand);
    border-color: var(--brand);
    color: var(--brand-contrast);
}

.wb-btn--text {
    width: auto;
    padding: 0 14px;
    font-family: var(--font-data);
    font-size: 10.5px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

/* ── 颜色 ── */
.wb-colors { gap: 5px; }

.wb-swatch {
    position: relative;
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 1px solid var(--rule-strong);
    cursor: pointer;
    padding: 0;
    transition: transform var(--dur-fast) var(--ease-spring), box-shadow var(--dur-fast) ease;
}
.wb-swatch:hover { transform: scale(1.18); }
.wb-swatch.is-on {
    transform: scale(1.18);
    box-shadow: 0 0 0 2px var(--wb-panel), 0 0 0 4px var(--brand);
}

.wb-swatch--custom {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: transparent;
    color: var(--text-secondary);
    font-size: 10px;
}
.wb-swatch--custom input[type="color"] {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    border: none;
    padding: 0;
    cursor: pointer;
}

/* ── 粗细 ── */
.wb-size {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    flex-shrink: 0;
    padding: 0 6px;
    color: var(--text-secondary);
    font-size: 14px;
    cursor: pointer;
}
.wb-size input[type="range"] {
    width: 92px;
    accent-color: var(--brand);
    cursor: pointer;
}
.wb-size-val {
    min-width: 18px;
    font-family: var(--font-data);
    font-size: 11.5px;
    color: var(--text-tertiary);
    text-align: right;
}

/* ── 下拉菜单 ── */
.wb-menu { position: relative; flex-shrink: 0; }

.wb-menu-panel {
    position: absolute;
    top: calc(100% + 10px);
    left: 50%;
    transform: translateX(-50%);
    z-index: 20;
    min-width: 148px;
    padding: 6px;
    border-radius: var(--radius-m);
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.wb-menu-panel--wide { min-width: 186px; }

.wb-menu-item {
    display: flex;
    align-items: center;
    gap: 9px;
    width: 100%;
    padding: 8px 10px;
    border: none;
    border-radius: var(--radius-xs);
    background: transparent;
    color: var(--text-primary);
    font-size: 13px;
    text-align: left;
    white-space: nowrap;
    cursor: pointer;
    transition: background var(--dur-fast) ease, color var(--dur-fast) ease;
}
.wb-menu-item i { font-size: 14px; color: var(--text-secondary); width: 16px; }
.wb-menu-item:hover { background: var(--bg-subtle); }
[data-mode="dark"] .wb-menu-item:hover { background: rgba(255, 255, 255, 0.08); }
.wb-menu-item.is-on { color: var(--brand); }
.wb-menu-item.is-on i { color: var(--brand); }
.wb-menu-item--danger { color: var(--red); }
.wb-menu-item--danger i { color: var(--red); }

.wb-menu-state {
    margin-left: auto;
    font-family: var(--font-data);
    font-size: 11px;
    color: var(--text-tertiary);
}
.wb-menu-hr {
    margin: 4px 2px;
    border: 0;
    border-top: 1px solid var(--rule);
}

/* ── 缩放 / 状态条 ── */
.wb-zoom {
    position: absolute;
    right: 14px;
    bottom: 14px;
    z-index: 10;
    display: flex;
    align-items: center;
    gap: 2px;
    padding: 5px 6px;
    border-radius: var(--radius-pill);
}
.wb-zoom-val {
    min-width: 54px;
    padding: 0 4px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font-data);
    font-size: 11.5px;
    cursor: pointer;
}
.wb-zoom-val:hover { color: var(--brand); }

.wb-hud {
    position: absolute;
    left: 14px;
    bottom: 14px;
    z-index: 10;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 7px 14px;
    border-radius: var(--radius-pill);
    font-family: var(--font-data);
    font-size: 11px;
    letter-spacing: 0.04em;
    color: var(--text-tertiary);
    white-space: nowrap;
}
.wb-hud b { color: var(--text-primary); font-weight: 600; }
.wb-hud-sep { opacity: 0.3; }
.wb-hud-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--text-tertiary);
    transition: background var(--dur-fast) ease, box-shadow var(--dur-fast) ease;
}
.wb-hud-dot.is-pen {
    background: var(--green);
    box-shadow: 0 0 0 3px var(--green-soft);
}

/* ── 提示：贴底居中，避开会换行的工具栏 ── */
.wb-toast {
    position: absolute;
    bottom: 62px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 30;
    padding: 9px 18px;
    border-radius: var(--radius-pill);
    background: var(--text-primary);
    color: var(--bg-card);
    font-size: 13px;
    box-shadow: var(--shadow-lift);
    animation: wbToastIn 0.22s var(--ease-out);
}
@keyframes wbToastIn {
    from { opacity: 0; transform: translate(-50%, 8px); }
    to   { opacity: 1; transform: translate(-50%, 0); }
}

/* ── 全屏 ── */
.wb:fullscreen,
.wb:-webkit-full-screen {
    height: 100vh;
    background: var(--wb-paper);
}

/* ── 移动端：工具栏可横向滚动 ── */
@media (max-width: 768px) {
    .wb-bar { top: 10px; gap: 2px; padding: 5px 6px; }
    .wb-sep { margin: 0 2px; }
    .wb-size input[type="range"] { width: 66px; }
    .wb-hud { font-size: 10.5px; padding: 6px 11px; gap: 6px; }
    .wb-ring { display: none; }
}

@media (max-width: 480px) {
    .wb-hud { display: none; }
}

@media (prefers-reduced-motion: reduce) {
    .wb-btn, .wb-swatch, .wb-toast { transition: none; animation: none; }
}