.cnasedu-login-modal {
    position: fixed;
    inset: 0;
    z-index: 100000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: rgba(15, 23, 42, 0.56);
}

.cnasedu-login-dialog {
    position: relative;
    width: min(480px, 100%);
    max-height: calc(100vh - 40px);
    overflow: auto;
    border-radius: 14px;
    background: #fff;
    box-shadow: 0 24px 70px rgba(15, 23, 42, 0.24);
    padding: 40px 48px 34px;
    color: #172033;
}

.cnasedu-login-close {
    position: absolute;
    top: 18px;
    right: 22px;
    display: grid;
    place-items: center;
    width: 32px;
    height: 32px;
    border: 0;
    border-radius: 50%;
    background: transparent;
    color: #334155;
    font-size: 17px;
    line-height: 1;
    cursor: pointer;
    padding: 0;
    box-shadow: none;
}

.cnasedu-login-close:hover,
.cnasedu-login-close:focus {
    background: #f1f5f9;
    color: #0f172a;
    box-shadow: none;
    outline: none;
}

.cnasedu-login-title {
    margin: 0 0 8px;
    font-size: 26px;
    line-height: 1.25;
    font-weight: 700;
}

.cnasedu-login-subtitle {
    margin: 0 0 26px;
    color: #475569;
    font-size: 15px;
}

.cnasedu-login-tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-bottom: 22px;
    padding: 4px;
    border-radius: 10px;
    background: #f1f5f9;
}

.cnasedu-login-tab {
    border: 0;
    border-radius: 8px;
    min-height: 40px;
    background: transparent;
    color: #475569;
    font-weight: 700;
    cursor: pointer;
}

.cnasedu-login-tab.is-active {
    background: #fff;
    color: #145df4;
    box-shadow: 0 1px 4px rgba(15, 23, 42, 0.12);
}

.cnasedu-login-panel[hidden] {
    display: none;
}

.cnasedu-login-qrbox {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 210px;
    height: 210px;
    margin: 0 auto 16px;
    border: 1px solid #e2e8f0;
    background: #fff;
}

.cnasedu-login-qrbox canvas {
    width: 180px;
    height: 180px;
}

.cnasedu-login-qr-fallback {
    display: inline-flex;
    justify-content: center;
    width: 100%;
    color: #145df4;
    font-weight: 700;
    text-decoration: none;
}

.cnasedu-login-hint {
    margin: 0 0 18px;
    text-align: center;
    color: #64748b;
    font-size: 14px;
}

.cnasedu-login-field {
    width: 100%;
    min-height: 48px;
    border: 1px solid #dbe3ef;
    border-radius: 8px;
    padding: 0 14px;
    font-size: 15px;
    outline: none;
    box-sizing: border-box;
}

.cnasedu-login-field:focus {
    border-color: #145df4;
    box-shadow: 0 0 0 3px rgba(20, 93, 244, 0.12);
}

.cnasedu-login-code-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 116px;
    gap: 10px;
    margin: 12px 0 18px;
}

.cnasedu-login-send {
    border: 1px solid #dbe3ef;
    border-radius: 8px;
    background: #fff;
    color: #145df4;
    font-weight: 700;
    cursor: pointer;
}

.cnasedu-login-send:disabled {
    color: #94a3b8;
    cursor: not-allowed;
}

.cnasedu-login-submit {
    width: 100%;
    min-height: 48px;
    border: 0;
    border-radius: 8px;
    background: #145df4;
    color: #fff;
    font-weight: 700;
    cursor: pointer;
}

.cnasedu-login-submit:disabled {
    opacity: 0.7;
    cursor: wait;
}

.cnasedu-login-message {
    display: none;
    margin: 14px 0 0;
    border-radius: 8px;
    padding: 10px 12px;
    font-size: 14px;
}

.cnasedu-login-message.is-error {
    display: block;
    background: #fef2f2;
    color: #b91c1c;
}

.cnasedu-login-message.is-ok {
    display: block;
    background: #ecfdf5;
    color: #047857;
}

@media (max-width: 560px) {
    .cnasedu-login-dialog {
        padding: 34px 22px 26px;
    }

    .cnasedu-login-code-row {
        grid-template-columns: 1fr;
    }

    .cnasedu-login-send {
        min-height: 44px;
    }
}