body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont,
        "Segoe UI", Helvetica, Arial,
        "Noto Sans KR", sans-serif;
    background: #f6f8fa;
    color: #24292f;
}

/* =========================
   WRAPPER
========================= */
.login-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    box-sizing: border-box;
}

/* =========================
   CARD
========================= */
.login-card {
    width: 420px;
    max-width: 100%;
    background: #ffffff;
    padding: 40px;
    border-radius: 6px;
    border: 1px solid #d0d7de;
    box-shadow: 0 1px 3px rgba(27, 31, 36, 0.04);
    text-align: center;
    box-sizing: border-box;
}

/* =========================
   TITLE
========================= */
h2 {
    margin-bottom: 18px;
    color: #24292f;
    font-size: 24px;
    font-weight: 600;
}

/* =========================
   INPUT GROUP (ID + DOMAIN)
========================= */
.input-group {
    display: flex;
    align-items: stretch;
    border: 1px solid #d0d7de;
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: 12px;
    box-sizing: border-box;
    background: #ffffff;
}

.input-group input {
    flex: 1;
    min-width: 0;
    border: none;
    padding: 12px;
    outline: none;
    font-size: 14px;
    color: #24292f;
    background: #ffffff;
    box-sizing: border-box;
}

/* domain */
.domain {
    background: #f6f8fa;
    padding: 12px 10px;
    font-size: 13px;
    color: #57606a;
    white-space: nowrap;
    border-left: 1px solid #d0d7de;
    box-sizing: border-box;
}

/* =========================
   PASSWORD INPUT
========================= */
input[type="password"] {
    width: 100%;
    padding: 12px;
    margin-bottom: 14px;
    border: 1px solid #d0d7de;
    border-radius: 6px;
    outline: none;
    font-size: 14px;
    color: #24292f;
    background: #ffffff;
    box-sizing: border-box;
}

/* focus */
input:focus,
.input-group:focus-within {
    border-color: #0969da;
    box-shadow: 0 0 0 3px rgba(9, 105, 218, 0.15);
}

/* =========================
   BUTTON
========================= */
button {
    width: 100%;
    padding: 12px;
    background: #2da44e;
    color: #ffffff;
    border: 1px solid rgba(27, 31, 36, 0.15);
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    font-size: 14px;
    box-sizing: border-box;
    transition: background 0.15s;
}

button:hover {
    background: #2c974b;
}

/* =========================
   LINK
========================= */
.bottom-link {
    margin-top: 14px;
}

.bottom-link a {
    color: #0969da;
    text-decoration: none;
    font-size: 13px;
}

.bottom-link a:hover {
    text-decoration: underline;
}

/* =========================
   MOBILE
========================= */
@media (max-width: 768px) {
    .login-card {
        width: 100%;
        padding: 24px;
        border-radius: 6px;
    }
}