html,
body.chat-login-page {
    min-height: 100%;
    margin: 0;
    background:
        radial-gradient(circle at left top, rgba(255, 255, 255, 0.98), rgba(248, 248, 246, 0.94) 34%, rgba(242, 245, 249, 0.92) 100%),
        linear-gradient(180deg, #f7f7f4 0%, #f4f6f9 100%);
    color: #202124;
    font-family: "SF Pro Display", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.chat-flat-login {
    position: relative;
    min-height: 100vh;
    overflow: hidden;
    padding: 18px 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.chat-flat-login-glow {
    position: absolute;
    width: 520px;
    height: 520px;
    border-radius: 50%;
    filter: blur(22px);
    pointer-events: none;
    opacity: 0.9;
}

.chat-flat-login-glow.is-left {
    top: -140px;
    left: -140px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.92) 0%, rgba(214, 229, 245, 0.44) 38%, rgba(214, 229, 245, 0) 74%);
}

.chat-flat-login-glow.is-right {
    right: -160px;
    bottom: -160px;
    background: radial-gradient(circle, rgba(214, 235, 255, 0.52) 0%, rgba(214, 235, 255, 0.16) 38%, rgba(214, 235, 255, 0) 74%);
}

.chat-flat-login-shell {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 520px;
}

.chat-flat-login-card {
    position: relative;
    overflow: hidden;
    padding: 28px 22px 22px;
    border: 1px solid rgba(228, 233, 240, 0.96);
    border-radius: 30px;
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.92) 0%, rgba(250, 251, 253, 0.88) 100%);
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.9),
        0 22px 54px rgba(114, 137, 163, 0.12);
    backdrop-filter: blur(12px);
}

.chat-flat-login-card:before {
    content: "";
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    height: 1px;
    background: rgba(255, 255, 255, 0.8);
}

.chat-flat-login-card-head {
    margin-bottom: 22px;
}

.chat-flat-login-card-kicker {
    display: inline-block;
    margin-bottom: 10px;
    color: #838b95;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.chat-flat-login-card-head h2 {
    margin: 0 0 10px;
    color: #27313a;
    font-size: 34px;
    font-weight: 500;
    line-height: 1.08;
    letter-spacing: -0.05em;
}

.chat-flat-login-card-head p {
    margin: 0;
    color: #717981;
    font-size: 14px;
    line-height: 1.8;
}

.chat-login-alert {
    margin-bottom: 18px;
    border: 0;
    border-radius: 16px;
    background: #fff1f0;
    color: #bf5148;
}

.chat-login-form .form-group {
    margin-bottom: 18px;
}

.chat-login-form label {
    display: block;
    margin-bottom: 8px;
    color: #4d5864;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.01em;
}

.chat-login-form .form-control {
    height: 56px;
    border: 1px solid rgba(219, 227, 236, 0.98);
    border-radius: 18px;
    background: rgba(248, 250, 252, 0.9);
    color: #2b3138;
    font-size: 15px;
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.92),
        0 8px 22px rgba(129, 150, 173, 0.07);
    transition:
        border-color 0.18s ease,
        background 0.18s ease,
        box-shadow 0.18s ease;
}

.chat-login-form .form-control::-webkit-input-placeholder {
    color: #97a0aa;
}

.chat-login-form .form-control::-moz-placeholder {
    color: #97a0aa;
}

.chat-login-form .form-control:-ms-input-placeholder {
    color: #97a0aa;
}

.chat-login-form .form-control::placeholder {
    color: #97a0aa;
}

.chat-login-form .form-control:focus {
    border-color: rgba(187, 205, 226, 0.98);
    background: #ffffff;
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.96),
        0 0 0 4px rgba(217, 231, 247, 0.6);
}

.chat-flat-login-submit {
    height: 56px;
    border: 1px solid rgba(218, 224, 232, 0.98);
    border-radius: 18px;
    background:
        linear-gradient(180deg, #f0ede8 0%, #e9e5df 100%);
    color: #24272c;
    font-size: 15px;
    font-weight: 600;
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.88),
        0 12px 28px rgba(115, 132, 153, 0.12);
    transition:
        transform 0.18s ease,
        box-shadow 0.18s ease,
        background 0.18s ease;
}

.chat-flat-login-submit:hover,
.chat-flat-login-submit:focus {
    background:
        linear-gradient(180deg, #f6f4f0 0%, #ece8e2 100%);
    color: #1d2024;
    transform: translateY(-1px);
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.9),
        0 16px 32px rgba(115, 132, 153, 0.16);
}

.chat-flat-login-submit[disabled] {
    opacity: 0.68;
    transform: none;
}

@media (min-width: 768px) {
    .chat-flat-login {
        padding: 28px;
    }

    .chat-flat-login-card {
        padding: 34px 30px 28px;
    }
}