.login-body {
    --login-ink: #172235;
    --login-muted: #718096;
    --login-line: #e3e8ef;
    --login-blue: #2563eb;
    min-height: 100vh;
    padding: clamp(24px, 5vw, 64px);
    background: #f5f7fa;
    color: var(--login-ink);
}

.login-shell {
    position: relative;
    grid-template-columns: minmax(340px, .9fr) 1px minmax(420px, 1.1fr);
    width: min(1040px, 100%);
    min-height: 620px;
    overflow: hidden;
    border: 1px solid rgba(23, 34, 53, .07);
    border-radius: 22px;
    background: #fff;
    box-shadow: 0 28px 72px rgba(23, 34, 53, .1);
}

.login-visual {
    position: relative;
    display: grid;
    place-items: center;
    min-width: 0;
    padding: clamp(48px, 7vw, 80px);
    overflow: hidden;
    background: #f8fafc;
}

.login-visual::after {
    display: none;
}

.brand-lockup {
    display: grid;
    justify-items: center;
    gap: 28px;
    color: var(--login-ink);
}

.brand-triangle {
    display: block;
    width: clamp(104px, 11vw, 132px);
    aspect-ratio: 1;
    overflow: visible;
    fill: var(--login-ink);
}

.brand-triangle-piece {
    opacity: 0;
    transform: translate(var(--brand-piece-x), var(--brand-piece-y));
    transform-box: view-box;
    transform-origin: center;
    animation: login-brand-piece var(--jia-motion-brand) var(--jia-ease-productive) both;
}

.brand-triangle-piece--left {
    --brand-piece-x: calc(-1 * var(--jia-motion-distance-popover));
    --brand-piece-y: var(--jia-motion-distance-popover);
}

.brand-triangle-piece--right {
    --brand-piece-x: var(--jia-motion-distance-popover);
    --brand-piece-y: var(--jia-motion-distance-popover);
}

.brand-triangle-piece--base {
    --brand-piece-x: 0px;
    --brand-piece-y: var(--jia-motion-distance-popover);
}

.brand-wordmark {
    display: block;
    width: 132px;
    height: auto;
    animation: login-brand-name var(--jia-motion-view) var(--jia-ease-productive) var(--jia-motion-view) both;
}

.login-divider {
    width: 1px;
    align-self: stretch;
    background: var(--login-line);
}

.login-panel {
    display: grid;
    align-items: center;
    min-width: 0;
    padding: clamp(44px, 7vw, 76px);
    background: #fff;
}

.login-card {
    width: min(100%, 400px);
    margin: 0 auto;
    animation: login-panel-enter var(--jia-motion-view) var(--jia-ease-productive) both;
}

.login-card h1 {
    margin: 0;
    color: var(--login-ink);
    font-size: var(--jia-type-display-size);
    font-weight: var(--jia-weight-semibold);
    line-height: var(--jia-type-display-line);
    letter-spacing: -.025em;
}

.feishu-entry {
    display: grid;
    justify-items: center;
    min-height: 230px;
    align-content: center;
    margin-top: 34px;
    border: 1px solid #e9edf3;
    border-radius: 12px;
    padding: 30px;
    background: #fafbfc;
}

.feishu-entry > img {
    width: 44px;
    height: 44px;
    object-fit: contain;
}

.feishu-login-btn {
    width: 100%;
    min-height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-top: 24px;
    border: 1px solid var(--login-blue);
    border-radius: 9px;
    background: var(--login-blue);
    color: #fff;
    font-size: var(--jia-type-body-size);
    font-weight: var(--jia-weight-semibold);
    line-height: var(--jia-type-body-line);
    text-decoration: none;
}

.feishu-login-btn:hover {
    border-color: #1d4ed8;
    background: #1d4ed8;
}

.feishu-login-btn.is-loading {
    opacity: .68;
    pointer-events: none;
}

.alert {
    display: none;
    margin-top: 18px;
    border: 1px solid #ffd4cf;
    border-radius: 9px;
    padding: 11px 12px;
    background: #fff1f0;
    color: #c43243;
    font-size: var(--jia-type-compact-size);
    line-height: var(--jia-type-compact-line);
}

.alert.show {
    display: block;
}

.login-unavailable {
    margin-top: 26px;
    border: 1px solid #ead9b7;
    border-radius: 9px;
    padding: 14px;
    background: #fffaf1;
    color: #8b672b;
    font-size: var(--jia-type-compact-size);
    line-height: var(--jia-type-compact-line);
}

.feishu-login-btn:focus-visible {
    outline: 2px solid rgba(37, 99, 235, .42);
    outline-offset: 3px;
}

@keyframes login-brand-name {
    from { opacity: 0; transform: translateY(var(--jia-motion-distance-popover)); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes login-brand-piece {
    from {
        opacity: 0;
        transform: translate(var(--brand-piece-x), var(--brand-piece-y));
    }
    to {
        opacity: 1;
        transform: translate(0, 0);
    }
}

@keyframes login-panel-enter {
    from { opacity: 0; transform: translateY(var(--jia-motion-distance-modal)); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 820px) {
    .login-body {
        padding: 0;
    }

    .login-shell {
        grid-template-columns: 1fr;
        grid-template-rows: auto 1px minmax(0, 1fr);
        min-height: 100vh;
        border: 0;
        border-radius: 0;
    }

    .login-visual {
        min-height: 210px;
        padding: 34px;
    }

    .brand-lockup {
        gap: 15px;
    }

    .brand-triangle {
        width: 70px;
    }

    .brand-wordmark {
        width: 94px;
    }

    .login-divider {
        width: 100%;
        height: 1px;
    }

    .login-panel {
        align-items: start;
        padding: 42px 28px 56px;
    }
}

@media (max-width: 520px) {
    .login-visual {
        min-height: 172px;
        padding: 26px;
    }

    .brand-triangle {
        width: 58px;
    }

    .login-panel {
        padding-inline: 22px;
    }

}

@media (prefers-reduced-motion: reduce) {
    .brand-wordmark,
    .brand-triangle-piece,
    .login-card {
        animation: none;
    }

    .brand-triangle-piece {
        opacity: 1;
        transform: none;
    }
}