:root {
    --header-start: #5d9fdd;
    --header-end: #82c1f4;
    --canvas-top: #d7e7f6;
    --canvas-bottom: #eff4fa;
    --surface: #ffffff;
    --surface-soft: #f4f8fc;
    --surface-muted: #eef3f9;
    --accent: #2f83dd;
    --accent-strong: #1d6ec9;
    --accent-soft: #e8f2ff;
    --text-primary: #253140;
    --text-secondary: #647789;
    --text-tertiary: #98a7b6;
    --line: #d6e1ed;
    --line-strong: #bfd0e2;
    --shadow-shell: 0 28px 64px rgba(35, 84, 141, 0.18);
    --shadow-card: 0 10px 28px rgba(44, 91, 144, 0.08);
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background: linear-gradient(180deg, var(--canvas-top) 0%, var(--canvas-bottom) 48%, #f6f8fb 100%);
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    background:
        radial-gradient(circle at top right, rgba(130, 193, 244, 0.35), transparent 24%),
        radial-gradient(circle at left center, rgba(78, 135, 196, 0.15), transparent 20%);
    pointer-events: none;
}

.kefu-login-wrap {
    position: relative;
    min-height: 100vh;
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
}

.kefu-login-hero {
    padding: 56px 64px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    color: var(--text-primary);
}

.kefu-login-brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--accent-strong);
}

.kefu-login-brand-badge {
    width: 44px;
    height: 44px;
    border-radius: 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--header-start) 0%, var(--accent) 52%, var(--accent-strong) 100%);
    color: #fff;
    font-size: 20px;
    box-shadow: 0 14px 30px rgba(35, 84, 141, 0.28);
}

.kefu-login-copy h1 {
    margin: 0 0 18px;
    font-size: 56px;
    line-height: 1.05;
    color: var(--text-primary);
}

.kefu-login-copy p {
    max-width: 560px;
    margin: 0;
    font-size: 18px;
    line-height: 1.8;
    color: var(--text-secondary);
}

.kefu-login-points {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    margin-top: 28px;
}

.kefu-login-points span {
    padding: 10px 14px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.72);
    border: 1px solid rgba(47, 131, 221, 0.16);
    color: var(--accent-strong);
    font-size: 13px;
}

.kefu-login-panel {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 32px;
}

.kefu-login-card {
    width: 100%;
    max-width: 460px;
    background: rgba(255, 255, 255, 0.88);
    border: 1px solid rgba(255, 255, 255, 0.72);
    border-radius: 22px;
    box-shadow: var(--shadow-shell);
    backdrop-filter: blur(6px);
    overflow: hidden;
}

.kefu-login-card-main {
    padding: 34px 34px 26px;
}

.kefu-login-eyebrow {
    display: inline-flex;
    padding: 6px 12px;
    border-radius: 999px;
    background: var(--accent-soft);
    color: var(--accent-strong);
    font-size: 12px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.kefu-login-card h2 {
    margin: 0;
    font-size: 30px;
    color: var(--text-primary);
}

.kefu-login-subtitle {
    margin: 12px 0 28px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.kefu-login-field {
    margin-bottom: 18px;
}

.kefu-login-label {
    display: block;
    margin-bottom: 10px;
    font-size: 13px;
    color: var(--text-secondary);
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.kefu-login-input {
    width: 100%;
    height: 54px;
    border: 1px solid var(--line);
    background: var(--surface-soft);
    border-radius: 15px;
    padding: 0 16px;
    font-size: 16px;
    color: var(--text-primary);
    transition: all 0.2s ease;
}

.kefu-login-input:focus {
    outline: none;
    border-color: rgba(47, 131, 221, 0.52);
    box-shadow: 0 0 0 5px rgba(47, 131, 221, 0.12);
    background: var(--surface);
}

.kefu-login-submit {
    width: 100%;
    height: 54px;
    border: none;
    border-radius: 15px;
    background: linear-gradient(90deg, var(--header-start) 0%, var(--accent) 52%, var(--accent-strong) 100%);
    color: #fff;
    font-size: 16px;
    font-weight: 600;
    letter-spacing: 0.04em;
    box-shadow: 0 16px 34px rgba(35, 84, 141, 0.25);
    cursor: pointer;
    transition: transform 180ms cubic-bezier(0.16, 1, 0.3, 1), box-shadow 180ms cubic-bezier(0.16, 1, 0.3, 1);
}

.kefu-login-submit:hover {
    transform: translateY(-1px);
    box-shadow: 0 18px 38px rgba(35, 84, 141, 0.32);
}

.kefu-login-foot {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-top: 20px;
    color: var(--text-tertiary);
    font-size: 13px;
}

.kefu-login-demo {
    padding: 18px 34px 24px;
    border-top: 1px solid var(--line);
    background: var(--surface-muted);
    color: var(--text-secondary);
    font-size: 13px;
    line-height: 1.8;
}

@media screen and (max-width: 980px) {
    .kefu-login-wrap {
        grid-template-columns: 1fr;
    }

    .kefu-login-hero {
        padding: 32px 24px 12px;
        gap: 28px;
    }

    .kefu-login-copy h1 {
        font-size: 38px;
    }

    .kefu-login-panel {
        padding: 12px 20px 28px;
    }

    .kefu-login-card-main,
    .kefu-login-demo {
        padding-left: 22px;
        padding-right: 22px;
    }
}