:root {
    --primary-color: #e74c3c;
    --secondary-color: #2c3e50;
    --background-color: #f5f6fa;
    --text-color: #2c3e50;
    --border-radius: 8px;
    --spacing: 20px;
}

/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    padding: var(--spacing);
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing);
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: var(--spacing);
    font-size: 2.5rem;
}

.nav-buttons {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-bottom: var(--spacing);
}

.secondary-btn {
    background-color: var(--secondary-color);
    color: white;
    padding: 8px 16px;
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    border: none;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.secondary-btn:hover {
    background-color: #34495e;
}

.input-group {
    display: flex;
    align-items: center;
    gap: 5px;
    margin-top: var(--spacing);
}

label {
    font-weight: 600;
    color: var(--secondary-color);
}

input, select {
    padding: 10px;
    border: 2px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(231, 76, 60, 0.2);
}

.timer-display {
    text-align: center;
    margin: var(--spacing) 0;
}

.session-name {
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 10px;
}

.session-subtext {
    font-size: 1rem;
    color: #555;
    margin-bottom: 10px;
}

.timer {
    font-size: 4rem;
    font-weight: bold;
    color: var(--primary-color);
    margin: var(--spacing) 0;
    font-family: monospace;
}

.controls {
    display: flex;
    align-items: center;
    gap: 10px;
    justify-content: center;
    margin-bottom: var(--spacing);
}

button {
    padding: 12px 24px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 100px;
}

#pauseBtn, #stopBtn {
    background-color: var(--secondary-color);
    color: white;
}

#pauseBtn:hover, #stopBtn:hover {
    background-color: #34495e;
}

button:disabled {
    background-color: #bdc3c7;
    cursor: not-allowed;
    opacity: 0.7;
}

button:focus,
*:focus,
*:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
}

.hidden {
    display: none !important;
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing);
}

.history-stats {
    background-color: #f8f9fa;
    padding: var(--spacing);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.stat-label {
    font-weight: 600;
    color: var(--secondary-color);
    margin-bottom: 5px;
}

.table-container {
    max-height: 400px;
    overflow-y: auto;
    margin-top: var(--spacing);
}

.records-table {
    width: 100%;
    border-collapse: collapse;
    background-color: white;
}

.records-table th,
.records-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #eee;
    white-space: nowrap;
}

.records-table th {
    background-color: var(--secondary-color);
    color: white;
    font-weight: 600;
    position: sticky;
    top: 0;
}

.records-table tr:hover,
.templates-table tr:hover {
    background-color: #f5f5f5;
}

.status-complete {
    color: #27ae60;
}

.status-stopped {
    color: #e74c3c;
}

@media (max-width: 480px) {
    .container {
        padding: 15px;
    }

    .timer {
        font-size: 3rem;
    }

    .controls {
        flex-direction: column;
    }

    button {
        width: 100%;
    }

    .history-stats {
        grid-template-columns: 1fr;
    }

    .templates-table {
        font-size: 0.9rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
    }
}

@media (prefers-contrast: high) {
    :root {
        --primary-color: #ff0000;
        --secondary-color: #000000;
        --text-color: #000000;
        --background-color: #ffffff;
    }
}

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background-color: white;
    padding: 20px;
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 400px;
}

.modal h2 {
    margin-bottom: var(--spacing);
    text-align: center;
}

.modal .input-group {
    margin-bottom: 15px;
}

.modal-buttons {
    display: flex;
    justify-content: space-between;
}

.templates-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: var(--spacing);
}

.templates-table th,
.templates-table td {
    padding: 10px;
    border-bottom: 1px solid #eee;
    text-align: center;
}

.templates-table th {
    background-color: var(--secondary-color);
    color: white;
    font-weight: 600;
}

.templates-table button {
    padding: 6px 12px;
    font-size: 0.9rem;
}

.templates-table button.delete-template-btn {
    background-color: #e74c3c;
    color: white;
}

.templates-table button.delete-template-btn:hover {
    background-color: #c0392b;
}

.templates-table button.start-template-btn {
    background-color: var(--primary-color);
    color: white;
}

.templates-table button.start-template-btn:hover {
    background-color: #c0392b;
}