body {
    margin: 0;
    padding: 0;
    background-color: #f0f0f0;
    font-family: "Microsoft YaHei", Arial, sans-serif;
}

html {
    scroll-behavior: smooth;
}

.content {
    text-align: center;
    color: #1a3a5c;
    font-size: 32px;
    font-weight: bold;
    padding: 60px 40px;
    max-width: 800px;
    width: 100%;
    margin: 0 auto;
}

.section {
    min-height: 100vh;
    padding: 80px 20px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-color: #f0f0f0;
}

.section:nth-child(even) {
    background-color: #e8e8e8;
}

.section-title {
    font-size: 36px;
    color: #1a3a5c;
    margin-bottom: 30px;
    font-weight: bold;
}

.section-content {
    max-width: 800px;
    text-align: center;
    line-height: 1.8;
    font-size: 18px;
    color: #333;
}

.email-link {
    color: #1a3a5c;
    text-decoration: none;
    font-size: 24px;
    border: 2px solid #1a3a5c;
    padding: 15px 30px;
    border-radius: 8px;
    transition: all 0.3s;
}

.email-link:hover {
    background-color: #1a3a5c;
    color: white;
}

.intro-text {
    margin-bottom: 40px;
    line-height: 1.6;
}

.image {
    margin-top: 40px;
    max-width: 400px;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.avatar {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid #1a3a5c;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    margin-bottom: 30px;
}

.bottom-buttons {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 40px;
}

.nav-button {
    padding: 10px 25px;
    font-size: 16px;
    background-color: #1a3a5c;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
    text-decoration: none;
}

.nav-button:hover {
    background-color: #0a2a4c;
}

.timer {
    margin-top: 40px;
    padding: 30px;
    background-color: white;
    border-radius: 15px;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
}

.timer-title {
    font-size: 20px;
    color: #1a3a5c;
    margin-bottom: 20px;
    font-weight: bold;
}

.timer-display {
    font-size: 64px;
    font-weight: bold;
    color: #1a5c3a;
    margin-bottom: 15px;
}

.timer-controls {
    display: flex;
    justify-content: center;
    gap: 10px;
}

.timer-button {
    padding: 10px 20px;
    font-size: 16px;
    background-color: #1a3a5c;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.timer-button:hover {
    background-color: #2a4a6c;
}

.timer-button:disabled {
    background-color: #ccc;
    cursor: not-allowed;
}