:root {
    color-scheme: light;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: #f4f7fb;
    color: #17223b;
}

body {
    margin: 0;
}

main {
    width: min(42rem, calc(100% - 3rem));
    margin: 12vh auto;
    padding: 3rem;
    border-radius: 1rem;
    background: #ffffff;
    box-shadow: 0 1rem 3rem rgb(23 34 59 / 10%);
}

h1 {
    margin-top: 0;
    color: #8b1e2d;
}

p {
    line-height: 1.65;
}

.status {
    display: inline-block;
    padding: 0.35rem 0.7rem;
    border-radius: 999px;
    background: #edf6ef;
    color: #246b35;
    font-weight: 700;
}

.hero {
    width: min(60rem, calc(100% - 2rem));
    margin: 3rem auto 0;
    text-align: center;
}

.hero + main {
    width: min(60rem, calc(100% - 4rem));
    margin-top: 2rem;
}

.chinese-name {
    color: #52647f;
    font-size: 1.35rem;
}

.news-grid,
.course-grid {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
}

.news-grid article,
.course-grid li {
    border: 1px solid #d7dee8;
    border-radius: 0.65rem;
    padding: 1rem;
}

.news-grid h3,
.news-grid p,
.course-grid {
    margin-top: 0;
}

.date,
.course-grid small {
    color: #5e6f86;
    display: block;
    font-size: 0.85rem;
}

.course-grid {
    list-style: none;
    padding: 0;
}

.course-grid small {
    margin-top: 0.35rem;
}

.notice {
    border-left: 0.25rem solid #b36b00;
    margin-top: 2rem;
    padding-left: 1rem;
}

nav ul {
    display: flex;
    flex-wrap: wrap;
    gap: .75rem;
    justify-content: center;
    list-style: none;
    margin: 1.5rem 0 0;
    padding: 0;
}

nav a {
    background: rgba(255, 255, 255, .12);
    border: 1px solid rgba(255, 255, 255, .35);
    border-radius: 999px;
    color: #fff;
    display: inline-flex;
    gap: .4rem;
    padding: .55rem .9rem;
    text-decoration: none;
}

nav a small {
    color: #d7e5ff;
}

.teacher-grid {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.teacher-card {
    align-items: flex-start;
    background: #fff;
    border: 1px solid #dbe4ef;
    border-radius: .8rem;
    display: flex;
    gap: 1rem;
    padding: 1rem;
}

.teacher-card img {
    aspect-ratio: 1;
    border-radius: 50%;
    object-fit: cover;
    width: 5rem;
}

.teacher-card h3 {
    margin-top: 0;
}

.teacher-card h3 small {
    color: #52616f;
    display: block;
    font-weight: 500;
}

.identity-panel {
    background: #fff;
    border: 1px solid #dbe4ef;
    border-radius: .8rem;
    margin: 4rem auto;
    max-width: 38rem;
    padding: 2rem;
}

.identity-panel form {
    display: grid;
    gap: 1rem;
}

.identity-panel label {
    display: grid;
    font-weight: 700;
    gap: .4rem;
}

.identity-panel input {
    border: 1px solid #9baec1;
    border-radius: .35rem;
    font: inherit;
    padding: .7rem;
}

.identity-panel button {
    background: #164a7b;
    border: 0;
    border-radius: .35rem;
    color: #fff;
    cursor: pointer;
    font: inherit;
    font-weight: 700;
    padding: .75rem 1rem;
}

.form-error {
    color: #9c1c1c;
    font-weight: 700;
}

select {
    border: 1px solid #9baec1;
    border-radius: .35rem;
    font: inherit;
    padding: .7rem;
}

.button-link {
    background: #164a7b;
    border-radius: .35rem;
    color: #fff;
    display: inline-block;
    font-weight: 700;
    padding: .75rem 1rem;
    text-decoration: none;
}

table {
    border-collapse: collapse;
    width: 100%;
}

th,
td {
    border-bottom: 1px solid #dbe4ef;
    padding: .55rem;
    text-align: left;
}

.admin-course-grid {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr));
}

.admin-course {
    border: 1px solid #dbe4ef;
    border-radius: .5rem;
    display: grid;
    gap: .6rem;
    padding: 1rem;
}

.admin-course label {
    display: grid;
    gap: .3rem;
}