.bta-login-shell {
    max-width: 540px;
    margin: 48px auto;
}

.bta-login-card {
    padding: 38px;
    border: 1px solid #d9e7f7;
    border-radius: 24px;
    background:
        radial-gradient(circle at top right, rgba(134, 185, 255, 0.2), transparent 32%),
        linear-gradient(180deg, #ffffff 0%, #f4f9ff 100%);
    box-shadow: 0 24px 60px rgba(17, 65, 116, 0.12);
}

.bta-login-eyebrow {
    display: inline-block;
    margin-bottom: 12px;
    padding: 6px 12px;
    border-radius: 999px;
    background: #e8f1fd;
    color: #215b96;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.bta-login-card h1 {
    margin: 0 0 8px;
    color: #102a43;
    font-size: clamp(2rem, 4vw, 2.7rem);
    line-height: 1.05;
}

.bta-login-intro {
    margin: 0 0 28px;
    color: #486581;
    font-size: 1rem;
    line-height: 1.65;
}

.bta-login-error {
    margin-bottom: 18px;
    padding: 14px 16px;
    border: 1px solid #f7b7b2;
    border-radius: 14px;
    background: #fff4f2;
    color: #b42318;
    font-weight: 600;
}

.bta-login-success {
    margin-bottom: 18px;
    padding: 14px 16px;
    border: 1px solid #a8d5b5;
    border-radius: 14px;
    background: #f0faf3;
    color: #1a6e35;
    font-weight: 600;
}

.bta-login-form {
    display: grid;
    gap: 18px;
}

.bta-login-field label {
    display: block;
    margin-bottom: 8px;
    color: #243b53;
    font-size: 0.95rem;
    font-weight: 700;
}

.bta-login-input-wrap {
    position: relative;
}

.bta-login-input-icon {
    position: absolute;
    top: 50%;
    left: 16px;
    width: 20px;
    height: 20px;
    color: #5b8ec7;
    transform: translateY(-50%);
    pointer-events: none;
}

.bta-login-field input[type="text"],
.bta-login-field input[type="email"],
.bta-login-field input[type="password"] {
    width: 100%;
    min-height: 54px;
    padding: 15px 52px 15px 48px;
    border: 1px solid #c6daf2;
    border-radius: 16px;
    background: #ffffff;
    color: #102a43;
    font-size: 1rem;
    box-sizing: border-box;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

.bta-login-field input[type="text"]::placeholder,
.bta-login-field input[type="email"]::placeholder,
.bta-login-field input[type="password"]::placeholder {
    color: #7b9bbd;
}

.bta-login-field input[type="text"]:focus,
.bta-login-field input[type="email"]:focus,
.bta-login-field input[type="password"]:focus {
    outline: none;
    border-color: #3f83d8;
    background: #fdfefe;
    box-shadow: 0 0 0 4px rgba(63, 131, 216, 0.16);
}

.bta-password-toggle {
    position: absolute;
    top: 50%;
    right: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 0;
    border: 0;
    border-radius: 10px;
    background: transparent;
    color: #537ea8;
    cursor: pointer;
    transform: translateY(-50%);
    transition: background-color 0.2s ease, color 0.2s ease;
}

.bta-password-toggle:hover,
.bta-password-toggle:focus {
    outline: none;
    background: #eaf3ff;
    color: #1f5f9d;
}

.bta-password-toggle svg {
    width: 20px;
    height: 20px;
}

.bta-password-toggle .bta-icon-eye-off {
    display: none;
}

.bta-password-toggle.is-active .bta-icon-eye {
    display: none;
}

.bta-password-toggle.is-active .bta-icon-eye-off {
    display: block;
}

.screen-reader-text {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.bta-login-options {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}

.bta-login-remember {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: #486581;
    font-weight: 600;
}

.bta-login-remember input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: #2f6fb3;
}

.bta-login-submit {
    width: 100%;
    min-height: 56px;
    padding: 15px 20px;
    border: 0;
    border-radius: 16px;
    background: linear-gradient(135deg, #3f83d8 0%, #215b96 100%);
    color: #ffffff;
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.01em;
    cursor: pointer;
    box-shadow: 0 18px 30px rgba(33, 91, 150, 0.22);
    transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
}

.bta-login-submit:hover,
.bta-login-submit:focus {
    transform: translateY(-1px);
    box-shadow: 0 22px 34px rgba(33, 91, 150, 0.28);
    filter: brightness(1.04);
}

.bta-login-links {
    margin-top: 22px;
    text-align: center;
    color: #627d98;
}

.bta-login-links a {
    color: #215b96;
    font-weight: 700;
    text-decoration: none;
}

.bta-login-links a:hover,
.bta-login-links a:focus {
    text-decoration: underline;
}

@media (max-width: 640px) {
    .bta-login-card {
        padding: 28px 20px;
        border-radius: 20px;
    }

    .bta-login-options {
        align-items: flex-start;
        flex-direction: column;
    }
}