.authentication-shell {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: radial-gradient( circle at 14% 18%, var(--accent-soft), transparent 34% ), radial-gradient( circle at 88% 82%, rgba(89, 108, 245, 0.045), transparent 30% ), var(--page-bg);
    transition: background-color 220ms ease, color 220ms ease;
}

html[data-theme="dark"]
.authentication-shell {
    background: radial-gradient( circle at 14% 18%, rgba(145, 167, 255, 0.07), transparent 34% ), radial-gradient( circle at 88% 82%, rgba(145, 167, 255, 0.035), transparent 30% ), var(--page-bg);
}

.authentication-header {
    min-height: 76px;
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 14px 28px;
    border-bottom: 1px solid var(--border);
    background: var(--topbar-bg);
    transition: background-color 220ms ease, border-color 220ms ease;
}

.authentication-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.authentication-tools {
    margin-left: auto;
}

.authentication-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 44px 28px;
}

.login-page {
    width: min( 1080px, 100% );
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(360px, 430px);
    gap: 82px;
    align-items: center;
}

.login-introduction {
    max-width: 600px;
}

.login-product-label {
    display: block;
    margin-bottom: 18px;
    color: var(--accent);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.16em;
}

.login-introduction h1 {
    max-width: 620px;
    margin-bottom: 20px;
    color: var(--text);
    font-size: clamp( 42px, 5vw, 68px );
    font-weight: 700;
    line-height: 1.02;
    letter-spacing: -0.05em;
}

    .login-introduction h1 span {
        display: block;
        color: var(--text-soft);
        font-weight: 600;
    }

.login-introduction > p {
    max-width: 550px;
    margin-bottom: 34px;
    color: var(--text-soft);
    font-size: 15px;
    line-height: 1.7;
}

.login-capabilities {
    display: grid;
    gap: 12px;
}

    .login-capabilities > div {
        display: flex;
        align-items: center;
        gap: 13px;
    }

.login-capability-icon {
    width: 38px;
    height: 38px;
    flex: 0 0 auto;
    display: grid;
    place-items: center;
    border: 1px solid rgba(89, 108, 245, 0.14);
    border-radius: 11px;
    background: var(--accent-soft);
    color: var(--accent);
    box-shadow: var(--control-shadow);
}

html[data-theme="dark"]
.login-capability-icon {
    border-color: rgba(145, 167, 255, 0.16);
}

.login-capabilities > div > span:last-child {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.login-capabilities strong {
    color: var(--text);
    font-size: 12px;
    font-weight: 600;
}

.login-capabilities small {
    color: var(--text-muted);
    font-size: 11px;
}

.login-card,
.auth-card {
    border: 1px solid var(--border);
    border-radius: 20px;
    background: var(--surface);
    box-shadow: 0 24px 64px rgba(31, 42, 63, 0.10);
    transition: background-color 220ms ease, border-color 220ms ease, box-shadow 220ms ease;
}

html[data-theme="dark"]
.login-card,
html[data-theme="dark"]
.auth-card {
    box-shadow: 0 28px 68px rgba(0, 0, 0, 0.22);
}

.login-card {
    padding: 30px;
}

.login-card-heading {
    margin-bottom: 24px;
}

    .login-card-heading h2 {
        margin-bottom: 8px;
        color: var(--text);
        font-size: 24px;
        font-weight: 600;
        letter-spacing: -0.025em;
    }

    .login-card-heading p {
        margin-bottom: 0;
        color: var(--text-muted);
        font-size: 12px;
    }

.login-form {
    display: flex;
    flex-direction: column;
    gap: 17px;
}

.form-field {
    display: flex;
    flex-direction: column;
    gap: 7px;
}

    .form-field label {
        color: var(--text-soft);
        font-size: 11px;
        font-weight: 600;
    }

    .form-field input {
        width: 100%;
        height: 46px;
        padding: 0 13px;
        border: 1px solid var(--border-strong);
        border-radius: 11px;
        outline: none;
        background: var(--control-bg);
        color: var(--text);
        box-shadow: var(--control-shadow);
        transition: background-color 160ms ease, border-color 160ms ease, box-shadow 160ms ease, color 160ms ease;
    }

        .form-field input:hover {
            border-color: rgba(89, 108, 245, 0.24);
        }

html[data-theme="dark"]
.form-field input:hover {
    border-color: rgba(145, 167, 255, 0.26);
}

.form-field input::placeholder {
    color: var(--text-muted);
}

.form-field input:focus {
    border-color: var(--accent);
    box-shadow: var(--focus-ring);
}

.login-submit {
    min-height: 47px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 4px;
    padding: 0 16px;
    border: 1px solid var(--accent);
    border-radius: 11px;
    background: var(--accent);
    color: #ffffff;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 8px 20px rgba(89, 108, 245, 0.18);
    transition: background-color 150ms ease, border-color 150ms ease, box-shadow 150ms ease, transform 100ms ease;
}

    .login-submit:hover {
        background: var(--accent-strong);
        border-color: var(--accent-strong);
        transform: translateY(-1px);
        box-shadow: 0 11px 25px rgba(89, 108, 245, 0.22);
    }

    .login-submit:active {
        transform: scale(0.985);
    }

    .login-submit:focus-visible {
        outline: none;
        box-shadow: var(--focus-ring);
    }

.login-alert {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 18px;
    padding: 11px 12px;
    border: 1px solid rgba(217, 87, 87, 0.22);
    border-radius: 10px;
    background: rgba(217, 87, 87, 0.07);
    color: var(--danger);
}

    .login-alert > span {
        font-weight: 700;
    }

    .login-alert p {
        margin: 0;
        font-size: 11px;
        line-height: 1.5;
    }

.login-security-note {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    margin-top: 20px;
    padding-top: 18px;
    border-top: 1px solid var(--border);
}

    .login-security-note > span {
        color: var(--success);
        font-size: 9px;
    }

    .login-security-note p {
        margin: 0;
        color: var(--text-muted);
        font-size: 10px;
        line-height: 1.55;
    }

.auth-card {
    width: min( 460px, 100% );
    padding: 30px;
    text-align: left;
}

    .auth-card h1 {
        font-size: 30px;
    }

    .auth-card p {
        color: var(--text-soft);
        line-height: 1.6;
    }

@media (max-width: 900px) {
    .login-page {
        grid-template-columns: 1fr;
        gap: 42px;
    }

    .login-introduction {
        display: none;
    }

    .login-card {
        width: min( 440px, 100% );
        margin: 0 auto;
    }
}

@media (max-width: 600px) {
    .authentication-header {
        padding: 12px 18px;
    }

    .authentication-brand
    .brand-copy span {
        display: none;
    }

    .authentication-content {
        padding: 24px 16px;
    }

    .login-card {
        padding: 23px 20px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .authentication-shell,
    .authentication-header,
    .login-card,
    .auth-card,
    .form-field input,
    .login-submit {
        transition: none;
    }
}