* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: Arial, "Microsoft YaHei", sans-serif;
    background: #f4f6ef;
    color: #17211c;
}
a { color: inherit; }
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}
.login-card {
    width: 100%;
    max-width: 460px;
    background: #fff;
    border-radius: 14px;
    padding: 36px;
    box-shadow: 0 10px 30px rgba(0,0,0,.06);
}
.avatar {
    width: 62px;
    height: 62px;
    border-radius: 50%;
    background: #c7f75c;
    color: #17211c;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
    font-size: 24px;
}
.login-card .avatar { margin-bottom: 28px; }
h1 { font-size: 36px; margin: 0 0 12px; }
.desc { color: #8a928c; margin-bottom: 30px; font-size: 16px; }
label { display: block; font-weight: 800; margin-bottom: 8px; }
input {
    width: 100%;
    height: 52px;
    border: 1px solid #dde3dc;
    border-radius: 10px;
    padding: 0 16px;
    font-size: 16px;
    margin-bottom: 20px;
    background: #fff;
}
button {
    border: 0;
    cursor: pointer;
    font-family: inherit;
}
.primary-btn {
    width: 100%;
    height: 58px;
    border-radius: 10px;
    background: #109968;
    color: #fff;
    font-size: 20px;
    font-weight: 900;
}
.note { margin-top: 22px; text-align: center; color: #8a928c; font-size: 14px; }
.error { background: #fff0f0; color: #c0392b; padding: 12px; border-radius: 8px; margin-bottom: 18px; }
.top {
    background: #0e2a1e;
    color: #fff;
    padding: 24px;
}
.brand {
    max-width: 1100px;
    margin: 0 auto 26px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 900;
}
.logout { margin-left: auto; color: #cfd8d1; text-decoration: none; font-size: 14px; }
.nav {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    gap: 12px;
    overflow-x: auto;
}
.nav a {
    white-space: nowrap;
    color: #cfd8d1;
    text-decoration: none;
    padding: 14px 18px;
    border-radius: 10px;
    font-weight: 800;
}
.nav a.active {
    background: rgba(255,255,255,.08);
    color: #fff;
    border-left: 4px solid #c7f75c;
}
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 38px 24px;
}
.label {
    color: #109968;
    letter-spacing: 5px;
    font-weight: 900;
    font-size: 13px;
    margin-bottom: 18px;
}
.page-title { margin-bottom: 30px; }
.grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
}
.card {
    background: #fff;
    border: 1px solid #e0e5de;
    border-radius: 8px;
    padding: 26px;
    min-height: 150px;
}
.card.dark { background: #0e2a1e; color: #fff; }
.card-title { color: #8a928c; font-size: 15px; margin-bottom: 18px; }
.card.dark .card-title { color: #cfd8d1; }
.num { font-size: 32px; font-weight: 900; margin-bottom: 20px; }
.sub { color: #8a928c; font-size: 14px; }
.invite, .how {
    margin-top: 34px;
    background: #fff;
    border: 1px solid #e0e5de;
    border-radius: 8px;
    padding: 28px;
}
.invite-box {
    margin-top: 20px;
    display: flex;
    gap: 10px;
    border: 1px dashed #c9d1c8;
    border-radius: 10px;
    padding: 12px;
}
.invite-box input { flex: 1; border: 0; outline: 0; margin-bottom: 0; height: 46px; }
.copy-btn {
    background: #0e2a1e;
    color: #fff;
    border-radius: 8px;
    padding: 0 22px;
    font-weight: 900;
}
.steps { margin: 0; padding-left: 20px; line-height: 2; color: #59645e; }
@media (max-width: 900px) { .grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) {
    h1 { font-size: 32px; }
    .login-card { padding: 30px 24px; }
    .card { padding: 20px; }
    .num { font-size: 26px; }
    .invite-box { flex-direction: column; }
    .copy-btn { height: 46px; }
}