:root {
    --bg: #f0f3f8;
    --panel-bg: #ffffff;
    --card-bg: #e6ecf5;
    --text: #1a1a2e;
    --text-secondary: #5a6a7e;
    --accent: #2563eb;
    --accent-light: #3b82f6;
    --pass: #16a34a;
    --fail: #dc2626;
    --border: #d0d7e5;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --sidebar-width: 320px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html,
body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: 'Segoe UI', 'Consolas', monospace;
    background: var(--bg);
    color: var(--text);
}

/* ═══ 应用布局：画布全屏 + 悬浮侧边栏 ═══ */
#app {
    width: 100%;
    height: 100%;
    position: relative;
}

/* ═══ 悬浮侧边栏（左上角，圆角矩形） ═══ */
.sidebar {
    position: absolute;
    top: 16px;
    left: 16px;
    width: var(--sidebar-width);
    height: 386px;
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-radius: 12px;
    box-shadow:
        0 8px 32px rgba(0, 0, 0, 0.10),
        0 2px 6px rgba(0, 0, 0, 0.06),
        inset 0 0 0 1px rgba(0, 0, 0, 0.04);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    overflow-x: hidden;
    transition: transform 0.35s cubic-bezier(.4, 0, .2, 1),
        opacity 0.25s ease,
        border-radius 0.25s ease;
    z-index: 100;
}

.sidebar.collapsed {
    transform: translateX(calc(-1 * var(--sidebar-width) - 16px));
    opacity: 0;
    border-radius: 12px 0 0 12px;
}

/* ═══ 独立悬浮折叠按钮（跟随侧边栏右边缘） ═══ */
.toggle-float {
    position: absolute;
    top: 16px;
    /* 与 sidebar.top 对齐 */
    left: 342px;
    /* sidebar.left(16) + sidebar.width(320) + gap(6) */
    width: 28px;
    height: 28px;
    border-radius: 7px;
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    box-shadow:
        0 4px 12px rgba(0, 0, 0, 0.10),
        0 1px 3px rgba(0, 0, 0, 0.06);
    border: 1px solid rgba(0, 0, 0, 0.08);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    line-height: 1;
    transition: background 0.15s,
        color 0.15s,
        box-shadow 0.15s,
        left 0.35s cubic-bezier(.4, 0, .2, 1),
        opacity 0.25s ease;
    user-select: none;
    z-index: 110;
}

.toggle-float:hover {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
    box-shadow: 0 6px 16px rgba(37, 99, 235, 0.25);
}

/* 折叠时：按钮滑到侧边栏原位置旁边 */
.toggle-float.sidebar-hidden {
    left: 24px;
    /* sidebar.left(16) + gap(8) */
    opacity: 1;
}

/* ═══ 仿真控制面板悬浮面板（右上角） ═══ */
.sim-float {
    position: absolute;
    top: 16px;
    right: 16px;
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-radius: 10px;
    box-shadow:
        0 4px 20px rgba(0, 0, 0, 0.08),
        0 1px 3px rgba(0, 0, 0, 0.04),
        inset 0 0 0 1px rgba(0, 0, 0, 0.03);
    padding: 8px 10px;
    z-index: 100;
}

.sim-float h3 {
    color: var(--accent);
    font-size: 0.78em;
    font-weight: 600;
    margin-bottom: 8px;
    padding-bottom: 8px;
    text-align: center;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.sim-group+.sim-group {
    margin-top: 6px;
    padding-top: 6px;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
}

.sim-group-title {
    font-size: 0.62em;
    color: var(--text-secondary);
    font-weight: 600;
    text-align: center;
    margin-bottom: 3px;
}

.sim-group-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.sim-btn {
    font-size: 0.72em;
    padding: 4px 10px;
    height: 36px;
    width: 84px;
    border: 1px solid rgba(37, 99, 235, 0.3);
    border-radius: 5px;
    background: rgba(37, 99, 235, 0.04);
    color: var(--accent);
    cursor: pointer;
    font-family: inherit;
    transition: all 0.12s;
    user-select: none;
    white-space: nowrap;
}

.sim-btn:hover {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.sim-btn.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.sim-num {
    font-size: 0.68em;
    color: var(--accent);
    font-weight: 600;
    min-width: 26px;
    text-align: center;
}

.sim-slider {
    flex: 1;
    height: 4px;
    -webkit-appearance: none;
    appearance: none;
    background: rgba(37, 99, 235, 0.15);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
}

.sim-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    border: 2px solid #fff;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.sim-btn.clear-btn {
    width: 100%;
    border-color: rgba(220, 38, 38, 0.2);
    background: rgba(220, 38, 38, 0.04);
    color: var(--fail);
}

.sim-btn.clear-btn:hover {
    background: var(--fail);
    color: #fff;
    border-color: var(--fail);
}

/* ═══ 画布区域（全屏） ═══ */
.canvas-area {
    width: 100%;
    height: 100%;
    position: relative;
    overflow: hidden;
}

.canvas-wrapper {
    width: 100%;
    height: 100%;
    cursor: crosshair;
}

/* ═══ 面板通用样式 ═══ */
.panel {
    padding: 10px 14px;
}

.panel+.panel {
    border-top: 1px solid rgba(0, 0, 0, 0.06);
}

.panel:last-child {
    border-bottom: none;
    border-radius: 0 0 12px 12px;
}

.panel:first-of-type {
    border-radius: 12px 12px 0 0;
}

.panel h3 {
    color: var(--accent);
    font-size: 0.85em;
    font-weight: 600;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.panel h3::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
    margin-left: 8px;
}

/* ═══ 器件放置面板 ═══ */
.comp-group+.comp-group {
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid rgba(0, 0, 0, 0.06);
}

.comp-subtitle {
    font-size: 0.72em;
    color: var(--text-secondary);
    font-weight: 600;
    margin-bottom: 5px;
    letter-spacing: 0.3px;
}

.comp-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
}

.comp-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    padding: 7px 4px;
    border: 1px solid var(--border);
    border-radius: 5px;
    background: var(--card-bg);
    color: var(--text);
    cursor: pointer;
    font-size: 0.72em;
    transition: all 0.12s;
    user-select: none;
}

.comp-btn:hover {
    border-color: var(--accent);
    background: rgba(37, 99, 235, 0.06);
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(37, 99, 235, 0.10);
}

.comp-btn:active {
    transform: translateY(0);
}

.comp-btn .icon {
    width: 28px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 11px;
    letter-spacing: -0.5px;
}

.comp-btn.selected {
    border-color: var(--accent);
    background: rgba(37, 99, 235, 0.08);
    box-shadow: inset 0 0 0 1px var(--accent);
}

.mode-btn-row {
    display: flex;
    gap: 4px;
    margin-top: 8px;
}

.mode-btn {
    flex: 1;
    padding: 6px 4px;
    border: 1px solid var(--border);
    border-radius: 5px;
    background: var(--card-bg);
    color: var(--text);
    cursor: pointer;
    font-size: 0.74em;
    transition: all 0.12s;
    user-select: none;
    white-space: nowrap;
}

.mode-btn:hover {
    border-color: var(--accent);
    background: rgba(37, 99, 235, 0.06);
}

.mode-btn.active-select {
    border-color: var(--accent);
    background: rgba(37, 99, 235, 0.08);
    color: var(--accent);
}

.mode-btn.active-delete {
    border-color: var(--fail);
    background: rgba(220, 38, 38, 0.12);
    color: var(--fail);
}

.mode-btn.active-log {
    border-color: var(--accent);
    background: rgba(37, 99, 235, 0.08);
    color: var(--accent);
}

/* ═══ 日志全屏视图 ═══ */
.log-fullview {
    display: none;
    flex-direction: column;
    height: calc(100% - 24px);
    padding: 10px 14px;
}

.log-fullview.show {
    display: flex;
}

.log-fullview-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
    flex-shrink: 0;
}

.log-fullview-header h3 {
    margin: 0;
    font-size: 0.85em;
    font-weight: 600;
    color: var(--accent);
}

.log-fullview-close {
    padding: 3px 10px;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--card-bg);
    cursor: pointer;
    font-size: 0.72em;
    color: var(--text-secondary);
    transition: all 0.12s;
}

.log-fullview-close:hover {
    border-color: var(--fail);
    color: var(--fail);
}

.log-fullview-body {
    flex: 1;
    overflow-y: auto;
    font-size: 0.75em;
    font-family: 'Consolas', monospace;
}

.log-fullview-body .entry {
    padding: 2px 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.04);
}

.log-fullview-body .entry:last-child {
    border-bottom: none;
}

.log-fullview-body .ts {
    color: var(--text-secondary);
    margin-right: 6px;
}

.log-fullview-body .act {
    color: var(--accent);
}

.log-fullview-body .err {
    color: var(--fail);
}

/* 隐藏器件面板（日志全屏时） */
#compPanel.hidden {
    display: none;
}

/* ═══ 仿真控制面板 ═══ */
.signal-toolbar {
    display: flex;
    gap: 5px;
    margin-bottom: 6px;
    flex-wrap: wrap;
}

.signal-toolbar button {
    font-size: 0.72em;
    padding: 3px 7px;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--card-bg);
    color: var(--text);
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s;
}

.signal-toolbar button:hover {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.signal-toolbar button.active {
    background: var(--fail);
    color: #fff;
    border-color: var(--fail);
}

.signal-toolbar .label-text {
    font-size: 0.72em;
    color: var(--text-secondary);
    padding: 3px 2px;
    display: inline-flex;
    align-items: center;
}

.signal-list {
    max-height: 140px;
    overflow-y: auto;
}

.signal-item {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 3px 2px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.04);
    font-family: 'Consolas', monospace;
    font-size: 0.78em;
}

.signal-item:last-child {
    border-bottom: none;
}

.signal-item .wire-id {
    color: var(--text-secondary);
    min-width: 70px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ═══ 操作提示（右下角蓝色悬浮） ═══ */
.tips-float {
    position: absolute;
    bottom: 16px;
    right: 16px;
    background: rgba(37, 99, 235, 0.92);
    color: #fff;
    border-radius: 8px;
    padding: 10px 14px;
    font-size: 0.72em;
    line-height: 1.7;
    box-shadow:
        0 4px 16px rgba(37, 99, 235, 0.25),
        0 1px 3px rgba(0, 0, 0, 0.10);
    z-index: 100;
    max-width: 280px;
    transition: transform 0.35s cubic-bezier(.4, 0, .2, 1),
        opacity 0.25s ease;
}

.tips-float.hidden {
    transform: translateX(calc(100% + 24px));
    opacity: 0;
}

.tips-float .tips-toggle {
    position: absolute;
    top: 3px;
    right: 3px;
    width: 20px;
    height: 20px;
    border: none;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0);
    color: #fff;
    font-size: 11px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
    transition: background 0.15s, transform 0.15s;
}

.tips-float .tips-toggle:hover {
    background: rgba(255, 255, 255, 0);
    transform: scale(1.15);
}

.tips-float kbd {
    display: inline-block;
    padding: 0 4px;
    border: 1px solid rgba(255, 255, 255, 0.4);
    border-radius: 3px;
    background: rgba(255, 255, 255, 0.18);
    font-family: inherit;
    font-size: 0.9em;
    margin-right: 3px;
}