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

:root {
    --bg-color: #f5f7fa;
    --card-bg: #ffffff;
    --text-color: #333333;
    --text-secondary: #666666;
    --primary-color: #4a7dff;
    --primary-hover: #3a6ae8;
    --danger-color: #ff4757;
    --success-color: #2ed573;
    --warning-color: #ffa502;
    --border-color: #e1e5eb;
}

.dark-mode {
    --bg-color: #1a1a2e;
    --card-bg: #16213e;
    --text-color: #eaeaea;
    --text-secondary: #a0a0a0;
    --primary-color: #4a7dff;
    --primary-hover: #5a8aff;
    --border-color: #2a3a5a;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    padding: 20px;
    transition: all 0.3s ease;
}

.container {
    max-width: 600px;
    margin: 0 auto;
}

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

.header h1 {
    font-size: 1.5rem;
    font-weight: 600;
}

.header-actions {
    display: flex;
    gap: 8px;
}

.icon-btn {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: all 0.3s ease;
}

.icon-btn:hover {
    transform: scale(1.1);
}

.card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 16px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}

.form-group {
    margin-bottom: 16px;
}

.form-label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.form-select, .form-input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    font-size: 1rem;
    background: var(--bg-color);
    color: var(--text-color);
    transition: all 0.3s ease;
}

.form-select:focus, .form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(74, 125, 255, 0.2);
}

.thread-control {
    display: flex;
    align-items: center;
    gap: 12px;
}

.thread-btn {
    width: 44px;
    height: 44px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    background: var(--bg-color);
    color: var(--text-color);
    font-size: 1.4rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.thread-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.thread-btn:active {
    transform: scale(0.95);
}

.thread-input {
    flex: 1;
    text-align: center;
    font-size: 1.2rem;
    font-weight: 600;
}

.btn {
    width: 100%;
    padding: 16px;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(74, 125, 255, 0.4);
}

.btn-danger {
    background: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background: #ff3344;
}

.btn-success {
    background: var(--success-color);
    color: white;
}

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

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-group {
    display: flex;
    gap: 12px;
    margin-top: 12px;
}

.btn-group .btn {
    flex: 1;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.stat-item {
    text-align: center;
    padding: 16px 8px;
    background: var(--bg-color);
    border-radius: 12px;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.stat-value {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-value.speed {
    color: var(--success-color);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-color);
    border-radius: 4px;
    overflow: hidden;
    margin-top: 16px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--success-color));
    border-radius: 4px;
    transition: width 0.3s ease;
    width: 0%;
}

.status {
    text-align: center;
    padding: 12px;
    border-radius: 8px;
    font-size: 0.9rem;
    margin-top: 12px;
}

.status.running {
    background: rgba(46, 213, 115, 0.15);
    color: var(--success-color);
}

.status.stopped {
    background: rgba(255, 71, 87, 0.15);
    color: var(--danger-color);
}

.limit-setting {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 12px;
    padding: 12px;
    background: var(--bg-color);
    border-radius: 10px;
}

.limit-setting input {
    flex: 1;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--card-bg);
    color: var(--text-color);
    font-size: 0.9rem;
}

.limit-setting span {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.info-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-top: 12px;
}

.custom-link {
    margin-top: 12px;
}

.custom-link.hidden {
    display: none;
}

/* Toast 提示样式 */
.toast-container {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10000;
    display: flex;
    flex-direction: column-reverse;
    gap: 10px;
    pointer-events: none;
}

.toast {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 16px 24px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    display: flex;
    align-items: center;
    gap: 12px;
    animation: slideIn 0.3s ease;
    pointer-events: auto;
    min-width: 280px;
    max-width: 400px;
    border-left: 4px solid var(--primary-color);
}

.toast.success {
    border-left-color: var(--success-color);
}

.toast.error {
    border-left-color: var(--danger-color);
}

.toast.warning {
    border-left-color: var(--warning-color);
}

.toast-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 4px;
}

.toast-message {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.toast.hide {
    animation: slideOut 0.3s ease forwards;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideOut {
    from {
        opacity: 1;
        transform: translateY(0);
    }
    to {
        opacity: 0;
        transform: translateY(20px);
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .stat-item {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 14px 16px;
    }

    .stat-label {
        margin-bottom: 0;
    }

    .btn-group {
        flex-direction: column;
    }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.running .stat-value.speed {
    animation: pulse 1s ease-in-out infinite;
}

/* 截图时隐藏某些元素 */
.screenshot-mode .icon-btn,
.screenshot-mode .btn-group,
.screenshot-mode .watermark {
    display: none !important;
}

.watermark {
    display: none;
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 16px;
    padding-top: 12px;
    border-top: 1px dashed var(--border-color);
}

/* 图表容器 */
.chart-container {
    height: 280px;
    margin-top: 16px;
}

.card-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 8px;
}

.card-title::before {
    content: '';
    display: inline-block;
    width: 4px;
    height: 16px;
    background: var(--primary-color);
    border-radius: 2px;
}

/* IP信息卡片 */
.ip-info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.ip-info-item {
    padding: 14px;
    background: var(--bg-color);
    border-radius: 12px;
}

.ip-info-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.ip-info-label .flag {
    font-size: 1rem;
}

.ip-info-value {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-color);
    word-break: break-all;
}

.ip-info-location {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

.ip-loading {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.ip-error {
    color: var(--danger-color);
    font-size: 0.85rem;
}

@media (max-width: 480px) {
    .ip-info-grid {
        grid-template-columns: 1fr;
    }
}

/* 底部版权信息 */
.site-footer {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    padding: 20px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-align: center;
    margin-top: 10px;
}

.site-footer .footer-dot {
    color: var(--primary-color);
}

/* 截图区域 */
#captureArea {
    background: var(--bg-color);
    border-radius: 16px;
}

.screenshot-footer {
    display: none;
    justify-content: space-between;
    padding: 12px 16px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    border-top: 1px dashed var(--border-color);
    margin-top: 8px;
}

.screenshot-mode #captureArea {
    padding: 16px;
}

.screenshot-mode .screenshot-footer {
    display: flex;
}