:root {
    --bg: #f6f7fb;
    --text: #1f2430;
    --muted: #8a90a2;
    --line: #e6e8f0;
    --accent: #3b6ef6;
    --accent-dark: #2c58d4;
    --danger: #e2574c;
    --shadow: 0 10px 30px rgba(31, 36, 48, .12);
}

* { box-sizing: border-box; }

html, body {
    height: 100%;
    margin: 0;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    -webkit-font-smoothing: antialiased;
    overflow: hidden;
}

/* ================= 顶栏 ================= */
.topbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(255, 255, 255, .78);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--line);
    z-index: 20;
}

.topbar-title {
    font-size: 15px;
    font-weight: 600;
    letter-spacing: .5px;
    color: var(--muted);
}

/* 右上角按钮 + 鼠标悬停展开的二级菜单 */
.menu {
    position: relative;
}

.menu-trigger {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 36px;
    padding: 0 14px;
    font-size: 14px;
    color: var(--text);
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 10px;
    cursor: pointer;
    transition: border-color .18s, box-shadow .18s, background .18s;
}

.menu-trigger:hover,
.menu:focus-within .menu-trigger {
    border-color: #c9d4f4;
    background: #f5f8ff;
}

.caret {
    font-size: 11px;
    color: var(--muted);
    transition: transform .18s;
}

.menu:hover .caret,
.menu:focus-within .caret {
    transform: rotate(180deg);
}

.menu-panel {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 200px;
    padding: 6px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 12px;
    box-shadow: var(--shadow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    transition: opacity .18s, transform .18s, visibility .18s;
}

.menu:hover .menu-panel,
.menu:focus-within .menu-panel,
.menu.open .menu-panel {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* 悬停时留出的“缓冲区”，避免鼠标移动过程中菜单消失 */
.menu-panel::before {
    content: "";
    position: absolute;
    top: -10px;
    left: 0;
    right: 0;
    height: 10px;
}

.menu-item {
    display: block;
    width: 100%;
    padding: 10px 12px;
    font-size: 14px;
    text-align: left;
    color: var(--text);
    background: transparent;
    border: 0;
    border-radius: 8px;
    cursor: pointer;
    transition: background .15s, color .15s;
}

.menu-item:hover {
    background: #f0f4ff;
    color: var(--accent);
}

/* ================= 主区域 ================= */
.stage {
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 80px 20px 40px;
    text-align: center;
}

.timer {
    font-size: clamp(56px, 13vw, 132px);
    font-weight: 300;
    line-height: 1.1;
    letter-spacing: 4px;
    font-variant-numeric: tabular-nums;
    font-feature-settings: "tnum";
    color: var(--text);
    transition: color .25s;
}

.stage.running .timer { color: var(--accent); }

.status {
    font-size: 15px;
    color: var(--muted);
    letter-spacing: 2px;
}

.session-hint {
    font-size: 13px;
    color: #a8adbd;
    min-height: 18px;
}

.controls {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-top: 34px;
}

.btn {
    min-width: 148px;
    height: 52px;
    padding: 0 30px;
    font-size: 16px;
    font-family: inherit;
    border-radius: 26px;
    cursor: pointer;
    transition: transform .12s, background .18s, box-shadow .18s, color .18s;
}

.btn:active { transform: translateY(1px); }

.btn-primary {
    color: #fff;
    background: var(--accent);
    border: 0;
    box-shadow: 0 8px 20px rgba(59, 110, 246, .3);
}

.btn-primary:hover { background: var(--accent-dark); }

.btn-ghost {
    color: var(--accent);
    background: #fff;
    border: 1px solid #cdd9f8;
}

.btn-ghost:hover { background: #f2f6ff; }

.btn:disabled {
    opacity: .6;
    cursor: not-allowed;
    transform: none;
}

/* 运行中把主按钮切换成“暂停”的视觉提示 */
.stage.running .btn-primary {
    background: #fff;
    color: var(--danger);
    border: 1px solid #f2c9c5;
    box-shadow: 0 8px 20px rgba(226, 87, 76, .12);
}

.stage.running .btn-primary:hover { background: #fff6f5; }

.hidden { display: none !important; }

/* ================= 历史记录弹层 ================= */
.overlay {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background: rgba(24, 28, 38, .38);
    backdrop-filter: blur(2px);
    z-index: 40;
}

.panel {
    width: min(760px, 100%);
    max-height: 82vh;
    display: flex;
    flex-direction: column;
    padding: 22px 24px 18px;
    background: #fff;
    border-radius: 18px;
    box-shadow: 0 24px 60px rgba(20, 24, 34, .28);
    animation: pop .18s ease-out;
}

@keyframes pop {
    from { opacity: 0; transform: translateY(10px) scale(.98); }
    to   { opacity: 1; transform: none; }
}

.panel-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.panel-head h2 {
    margin: 0;
    font-size: 17px;
    font-weight: 600;
}

.icon-btn {
    width: 32px;
    height: 32px;
    font-size: 14px;
    color: var(--muted);
    background: #f4f5f9;
    border: 0;
    border-radius: 8px;
    cursor: pointer;
}

.icon-btn:hover { background: #e9ebf3; color: var(--text); }

.summary {
    margin: 0;
    font-size: 13px;
    color: var(--muted);
}

/* 历史记录工具栏：左侧统计 + 右侧「选择 / 全选 / 删除所选」 */
.panel-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    margin: 14px 0;
}

.bar-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.chip {
    height: 30px;
    padding: 0 12px;
    font-size: 13px;
    font-family: inherit;
    color: var(--text);
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 15px;
    cursor: pointer;
    transition: background .16s, border-color .16s, color .16s;
}

.chip:hover {
    background: #f0f4ff;
    border-color: #c9d4f4;
    color: var(--accent);
}

.chip-danger {
    color: var(--danger);
    border-color: #f2c9c5;
}

.chip-danger:hover {
    background: #fff3f2;
    border-color: #e8aaa4;
    color: var(--danger);
}

.chip:disabled {
    opacity: .5;
    cursor: not-allowed;
}

.chip:disabled:hover {
    background: #fff;
    border-color: var(--line);
}

.table-wrap {
    overflow: auto;
    border: 1px solid var(--line);
    border-radius: 12px;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

th, td {
    padding: 11px 14px;
    text-align: left;
    white-space: nowrap;
}

thead th {
    position: sticky;
    top: 0;
    font-weight: 500;
    color: var(--muted);
    background: #fafbfe;
    border-bottom: 1px solid var(--line);
}

tbody tr + tr td { border-top: 1px solid #f1f2f7; }

tbody tr:hover td { background: #fafbff; }

td.duration {
    font-weight: 600;
    color: var(--accent);
}

/* 表格中的勾选框与删除按钮 */
.col-check {
    width: 42px;
    text-align: center;
}

.col-check input {
    width: 15px;
    height: 15px;
    accent-color: var(--accent);
    cursor: pointer;
    vertical-align: middle;
}

.col-actions {
    width: 70px;
    text-align: right;
}

.link-btn {
    padding: 3px 6px;
    font-size: 13px;
    font-family: inherit;
    color: var(--danger);
    background: transparent;
    border: 0;
    border-radius: 6px;
    cursor: pointer;
}

.link-btn:hover {
    background: #fff3f2;
    text-decoration: underline;
}

tbody tr.selected td { background: #f4f8ff; }

.empty {
    padding: 40px 16px;
    text-align: center;
    color: var(--muted);
    font-size: 14px;
}

/* ================= 轻提示 ================= */
.toast {
    position: fixed;
    left: 50%;
    bottom: 44px;
    transform: translateX(-50%);
    padding: 11px 20px;
    font-size: 14px;
    color: #fff;
    background: rgba(31, 36, 48, .9);
    border-radius: 10px;
    z-index: 60;
    animation: pop .16s ease-out;
}