:root {
    --primary-bg: #121212;
    --surface-bg: #1e1e1e;
    --primary-text: #ffffff;
    --secondary-text: #b3b3b3;
    --accent-color: #2196f3;
    --nav-height: 60px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--primary-bg);
    color: var(--primary-text);
    min-height: 100vh;
}

.app {
    max-width: 480px;
    margin: 0 auto;
    padding-bottom: var(--nav-height);
    position: relative;
    min-height: 100vh;
}

.header {
    background-color: var(--surface-bg);
    padding: 20px;
    border-radius: 0 0 20px 20px;
}

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

.title-section h1 {
    font-size: 24px;
    margin-bottom: 8px;
}

.title-section h2 {
    font-size: 16px;
    color: var(--secondary-text);
    font-weight: normal;
}

.edit-btn {
    background: transparent;
    border: none;
    color: var(--accent-color);
    cursor: pointer;
    padding: 8px;
}

.status-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: rgba(255, 255, 255, 0.05);
    padding: 12px 16px;
    border-radius: 12px;
}

.mode, .battery {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--secondary-text);
}

.features {
    padding: 20px;
}

.feature-item {
    display: flex;
    align-items: center;
    padding: 16px;
    background-color: var(--surface-bg);
    margin-bottom: 12px;
    border-radius: 12px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.feature-item:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.feature-item span:not(.material-icons) {
    margin-left: 12px;
    flex-grow: 1;
}

.feature-item .arrow {
    color: var(--secondary-text);
}

.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: 480px;
    height: var(--nav-height);
    background-color: var(--surface-bg);
    display: flex;
    justify-content: space-around;
    align-items: center;
    padding: 8px 0;
    border-radius: 20px 20px 0 0;
    box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.2);
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--secondary-text);
    text-decoration: none;
    transition: color 0.3s;
    flex: 1;
    padding: 4px 0;
}

.nav-item span:not(.material-icons) {
    font-size: 12px;
    margin-top: 4px;
}

.nav-item .material-icons {
    font-size: 24px;
}

.nav-item.active {
    color: var(--accent-color);
}

/* 移动端适配 */
@media screen and (max-width: 480px) {
    .bottom-nav {
        height: 56px;
        padding: 4px 0;
    }

    .nav-item .material-icons {
        font-size: 22px;
    }

    .nav-item span:not(.material-icons) {
        font-size: 10px;
        margin-top: 2px;
    }
}

.material-icons {
    font-size: 24px;
}