:root {
    --ios-blue: #34C759;
    --ios-green: #34C759;
    --ios-red: #f55b53;
    --ios-gray: #8E8E93;
    --ios-light-gray: #F2F2F7;
    --ios-border: #C6C6C8;
    --ios-orange: #FF9500;
    --ios-purple: #338cec;
    --ios-teal: #5AC8FA;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    line-height: 1.6;
    background-color: var(--ios-light-gray);
    color: #000;
}

.container {
    display: flex;
    min-height: 100vh;
    padding: 0;
    max-width: 1400px;
    margin: 0 auto;
    background: white;
    box-shadow: 0 0 20px rgba(0,0,0,0.05);
}

.main-content {
    display: flex;
    flex: 1;
    padding: 24px;
    gap: 24px;
}

.stopwatch-section {
    flex: 0 0 40%;
    background: var(--ios-light-gray);
    padding: 24px;
    border-radius: 16px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    display: flex;
    flex-direction: column;
}

.countdown-section {
    flex: 0 0 60%;
    background: var(--ios-light-gray);
    padding: 24px;
    border-radius: 16px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    overflow-y: auto;  /* 添加滚动条 */
    max-height: calc(100vh - 48px);  /* 设置最大高度 */
}

.timer-display {
    font-size: 4em;
    font-family: -apple-system, BlinkMacSystemFont;
    font-weight: 200;
    text-align: center;
    margin: 40px 0;
    color: #000;
    letter-spacing: 2px;
}

.controls {
    display: flex;
    gap: 16px;
    margin-bottom: 32px;
    padding: 0 16px;
}

button {
    padding: 14px 28px;
    border: none;
    border-radius: 12px;
    background-color: var(--ios-blue);
    color: white;
    cursor: pointer;
    flex: 1;
    transition: all 0.2s ease;
    font-size: 16px;
    font-weight: 500;
    letter-spacing: 0.5px;
}

button:hover {
    transform: translateY(-1px);
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

button:active {
    transform: translateY(0);
}

button:disabled {
    background-color: var(--ios-gray);
    opacity: 0.6;
}

.segment-item {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    border-bottom: 1px solid var(--ios-border);
    transition: all 0.3s ease;
}

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

.segment-content {
    flex: 1;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 16px;
    padding: 0 12px;
}

.segment-name {
    color: #000;
    font-weight: 400;
}

.segment-time {
    color: var(--ios-gray);
    font-weight: 400;
}

.segment-edit-button {
    padding: 6px 16px;
    font-size: 14px;
    background-color: var(--ios-teal);
    border-radius: 8px;
    min-width: 70px;
    opacity: 0.9;
    transition: all 0.2s ease;
}

.segment-edit-button:hover {
    opacity: 1;
    transform: translateY(-1px);
}

.segment-item.segment-reached {
    background-color: rgba(0, 122, 255, 0.1);
}

.segment-item.segment-reached .segment-name,
.segment-item.segment-reached .segment-time {
    color: var(--ios-blue);
    font-weight: 500;
}

.segment-edit input {
    padding: 8px 12px;
    border: 1px solid var(--ios-border);
    border-radius: 8px;
    font-size: 16px;
    background: white;
}

.segment-edit input:focus {
    outline: none;
    border-color: var(--ios-blue);
}

.countdown-item {
    background: var(--ios-light-gray);
    margin: 16px 0;
    padding: 20px;
    border-radius: 16px;
    transition: all 0.3s ease;
}

.countdown-item.collapsed {
    padding: 16px 20px;
}

.countdown-item-header {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
}

.countdown-item-header h3 {
    flex: 1;
    margin: 0;
    display: flex;
    align-items: center;
    gap: 12px;
}

.collapse-indicator {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease;
    color: var(--ios-gray);
}

.collapsed .collapse-indicator {
    transform: rotate(-90deg);
}

.countdown-content {
    overflow: hidden;
    transition: all 0.3s ease;
}

.collapsed .countdown-content {
    height: 0;
    margin: 0;
    padding: 0;
}

.brief-info {
    display: none;
    margin-top: 12px;
    padding: 8px 0;
    font-size: 14px;
    color: var(--ios-gray);
}

.collapsed .brief-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brief-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.countdown-display {
    font-family: -apple-system, BlinkMacSystemFont;
    font-size: 1.2em;
    color: var(--ios-blue);
    font-weight: 500;
    margin-right: 12px;
}

.countdown-item.paused .countdown-display {
    color: var(--ios-gray);
}

.brief-controls {
    display: flex;
    gap: 8px;
}

.brief-controls button {
    padding: 6px 12px;
    font-size: 13px;
    min-width: auto;
}

.brief-controls .pause-button {
    background-color: var(--ios-orange);
}

.brief-controls .resume-button {
    background-color: var(--ios-blue);
}

.brief-segments {
    display: inline-flex;
    gap: 8px;
    margin-right: 12px;
}

.brief-segment {
    background: rgba(0,0,0,0.05);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 12px;
}

.brief-segment.reached {
    background-color: rgba(0, 122, 255, 0.1);
    color: var(--ios-blue);
}

.countdown-item-footer {
    margin-top: 16px;
    display: flex;
    gap: 12px;
}

.collapsed .countdown-item-footer {
    margin-top: 8px;
}

.countdown-item h3 {
    font-size: 22px;
    font-weight: 600;
    color: #000;
    margin-bottom: 16px;
}

.countdown-progress {
    width: 100%;
    height: 6px;
    background-color: rgba(0,0,0,0.1);
    border-radius: 6px;
    margin: 8px 0;
    overflow: hidden;
}

.countdown-progress-bar {
    height: 100%;
    background-color: var(--ios-blue);
    transition: width 0.1s linear;
}

.countdown-item.paused .countdown-progress-bar {
    background-color: var(--ios-gray);
}

.countdown-item.paused .time {
    color: var(--ios-gray);
}

.segments-list {
    background: rgba(0,0,0,0.02);
    padding: 20px;
    border-radius: 14px;
    margin: 16px 0;
}

.segments-list h4 {
    color: var(--ios-gray);
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.7px;
    margin-bottom: 16px;
}

.countdown-item-footer button {
    padding: 12px 20px;
}

.countdown-item-footer .start-button {
    flex: 2;
    background-color: var(--ios-green);
}

.countdown-item-footer .edit-button {
    flex: 1;
    background-color: var(--ios-purple);
}

.countdown-item-footer .delete-button {
    flex: 1;
    background-color: var(--ios-red);
}

.countdown-section::-webkit-scrollbar {
    width: 8px;
}

.countdown-section::-webkit-scrollbar-track {
    background: transparent;
}

.countdown-section::-webkit-scrollbar-thumb {
    background-color: var(--ios-border);
    border-radius: 4px;
}

@keyframes highlight {
    0% { background-color: transparent; }
    50% { background-color: rgba(52, 199, 89, 0.15); }
    100% { background-color: transparent; }
}

.segment-highlight {
    animation: highlight 0.8s ease;
}

.countdown-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.countdown-actions {
    display: flex;
    gap: 12px;
}

.action-button {
    padding: 8px 16px;
    font-size: 14px;
    background-color: var(--ios-purple);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.action-button:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.action-button:active {
    transform: translateY(0);
}

/* 添加多选相关样式 */
.countdown-item .select-checkbox {
    display: none;
    width: 20px;
    height: 20px;
    margin-right: 12px;
    cursor: pointer;
}

.select-mode .select-checkbox {
    display: block;
}

.select-mode .countdown-item-header {
    padding-left: 8px;
}

.delete-selected {
    background-color: var(--ios-red) !important;
}

/* 优化多选时的视觉效果 */
.select-mode .countdown-item.selected {
    border: 2px solid var(--ios-blue);
}

.select-mode .countdown-item {
    border: 2px solid transparent;
}