* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
    color: #183b3f;
    background-color: #f4f8f7;
}

header {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 40px 24px;
    text-align: center;
    background: linear-gradient(135deg, #e4f4f0, #fff6e9);
}

h1 {
    margin: 0 0 20px;
    color: #176b68;
    font-size: clamp(48px, 8vw, 96px);
    line-height: 1.1;
}

p {
    max-width: 720px;
    margin: 0;
    color: #49696d;
    font-size: clamp(18px, 2.5vw, 26px);
    line-height: 1.8;
}


main {
    width: min(960px, 100%);
    margin: 0 auto;
    padding: 96px 24px;
}

section {
    padding: 48px;
    background-color: #ffffff;
    border: 1px solid #dce9e6;
    border-radius: 24px;
    box-shadow: 0 20px 60px rgba(23, 107, 104, 0.1);
}

h2 {
    margin: 0 0 20px;
    color: #176b68;
    font-size: clamp(32px, 5vw, 48px);
}

main p {
    font-size: 18px;
    line-height: 1.9;
}


section + section {
    margin-top: 32px;
}

.learning-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-top: 32px;
}

.learning-card {
    padding: 28px;
    background-color: #f4f8f7;
    border-radius: 18px;
}

.learning-card span {
    color: #d98145;
    font-size: 14px;
    font-weight: 700;
}

.learning-card h3 {
    margin: 12px 0;
    color: #183b3f;
    font-size: 22px;
}

.learning-card p {
    font-size: 16px;
    line-height: 1.7;
}

.project-list {
    display: grid;
    gap: 20px;
    margin-top: 32px;
}

.project-card {
    padding: 28px;
    border: 1px solid #dce9e6;
    border-left: 5px solid #d98145;
    border-radius: 16px;
}

.project-card .project-status {
    color: #d98145;
    font-size: 14px;
    font-weight: 700;
}

.project-card h3 {
    margin: 10px 0;
    color: #183b3f;
    font-size: 24px;
}

.project-card p {
    font-size: 16px;
    line-height: 1.7;
}
.contact {
    color: #ffffff;
    background-color: #176b68;
}

.contact h2 {
    color: #ffffff;
}

.contact p {
    color: #e4f4f0;
    font-size: 18px;
}

.contact-link {
    display: inline-block;
    margin-top: 28px;
    padding: 14px 24px;
    color: #176b68;
    font-weight: 700;
    text-decoration: none;
    background-color: #ffffff;
    border-radius: 999px;
    transition: transform 0.2s ease;
}

.contact-link:hover {
    transform: translateY(-3px);
}

footer {
    padding: 32px 24px;
    text-align: center;
    background-color: #102f32;
}

footer p {
    max-width: none;
    color: #c9dedb;
    font-size: 14px;
}

html {
    scroll-behavior: smooth;
}

.site-nav {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 10;
    display: flex;
    justify-content: center;
    gap: 28px;
    width: 100%;
    padding: 16px 20px;
    background-color: rgba(255, 255, 255, 0.88);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(23, 107, 104, 0.12);
}

.site-nav a {
    color: #183b3f;
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
}

.site-nav a:hover {
    color: #d98145;
}

section {
    scroll-margin-top: 90px;
}

@media (max-width: 600px) {
    .site-nav {
        justify-content: flex-start;
        gap: 18px;
        overflow-x: auto;
        white-space: nowrap;
    }

    section {
        padding: 32px 24px;
    }
}