* { box-sizing: border-box; }

html, body { min-height: 100%; }

body.business-login {
    margin: 0;
    color: #13213c;
    font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
    background: #eef3fb;
}

.login-shell {
    position: relative;
    display: grid;
    grid-template-columns: minmax(520px, 1.2fr) minmax(430px, .8fr);
    min-height: 100vh;
    overflow: hidden;
}

.brand-panel {
    position: relative;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    padding: 54px clamp(52px, 7vw, 110px) 46px;
    color: #fff;
    background:
        radial-gradient(circle at 84% 16%, rgba(46, 138, 255, .45), transparent 25%),
        radial-gradient(circle at 18% 84%, rgba(0, 214, 186, .16), transparent 28%),
        linear-gradient(135deg, #071a3e 0%, #0a2b64 55%, #0e4b99 100%);
}

.brand-panel::before,
.brand-panel::after {
    position: absolute;
    content: "";
    pointer-events: none;
}

.brand-panel::before {
    inset: 0;
    opacity: .2;
    background-image:
        linear-gradient(rgba(255,255,255,.08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,.08) 1px, transparent 1px);
    background-size: 42px 42px;
    mask-image: linear-gradient(to bottom, transparent, #000 22%, #000 76%, transparent);
}

.brand-panel::after {
    width: 420px;
    height: 420px;
    right: -185px;
    bottom: -190px;
    border: 1px solid rgba(255,255,255,.14);
    border-radius: 50%;
    box-shadow: 0 0 0 65px rgba(255,255,255,.025), 0 0 0 130px rgba(255,255,255,.02);
}

.brand-heading,
.hero-copy,
.feature-row,
.media-area { position: relative; z-index: 1; }

.brand-heading { display: flex; align-items: center; gap: 15px; }

.brand-mark {
    position: relative;
    display: inline-block;
    width: 48px;
    height: 48px;
    border-radius: 14px;
    background: linear-gradient(145deg, #57adff, #1768e5);
    box-shadow: 0 12px 30px rgba(0, 72, 190, .4);
}

.brand-mark i {
    position: absolute;
    display: block;
    width: 7px;
    border-radius: 7px;
    background: #fff;
    transform: rotate(35deg);
}

.brand-mark i:nth-child(1) { height: 20px; left: 13px; top: 17px; opacity: .65; }
.brand-mark i:nth-child(2) { height: 29px; left: 22px; top: 10px; }
.brand-mark i:nth-child(3) { height: 17px; left: 31px; top: 12px; opacity: .78; }

.company-name { font-size: 19px; font-weight: 700; letter-spacing: .08em; }
.company-en { margin-top: 4px; color: rgba(255,255,255,.56); font-size: 9px; letter-spacing: .17em; }

.hero-copy { max-width: 650px; margin: auto 0 44px; padding-top: 65px; }
.eyebrow { color: #70bdff; font-size: 12px; font-weight: 700; letter-spacing: .22em; }
.hero-copy h1 { margin: 20px 0 24px; font-size: clamp(42px, 4vw, 66px); line-height: 1.18; letter-spacing: -.03em; }
.hero-copy h1 em { color: #69b9ff; font-style: normal; }
.hero-copy p { max-width: 580px; margin: 0; color: rgba(255,255,255,.68); font-size: 16px; line-height: 1.9; }

.feature-row { display: flex; gap: 42px; margin-bottom: 46px; }
.feature-row div { padding-left: 15px; border-left: 2px solid #3d9cff; }
.feature-row strong, .feature-row span { display: block; }
.feature-row strong { margin-bottom: 6px; font-size: 15px; }
.feature-row span { color: rgba(255,255,255,.48); font-size: 12px; }

.media-label { display: block; margin-bottom: 14px; color: rgba(255,255,255,.48); font-size: 11px; letter-spacing: .15em; }
.media-list { display: flex; flex-wrap: wrap; gap: 10px; }
.media-card {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-height: 40px;
    padding: 8px 13px;
    border: 1px solid rgba(255,255,255,.12);
    border-radius: 9px;
    color: rgba(255,255,255,.82);
    background: rgba(255,255,255,.07);
    font-size: 12px;
    backdrop-filter: blur(8px);
}
.media-card b { font-family: Arial, sans-serif; font-size: 14px; }
.media-card.baidu b { color: #67a8ff; }
.media-card.so b { color: #85df35; }
.media-card.douyin b { color: #4de8e1; text-shadow: 2px 1px #ff477e; }
.media-card.kuaishou b { color: #ff8a39; font-size: 20px; line-height: 1; }

.login-panel {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 48px clamp(32px, 6vw, 96px) 30px;
    background:
        radial-gradient(circle at 100% 0, rgba(51,126,255,.09), transparent 32%),
        #f6f8fc;
}

.login-card { width: 100%; max-width: 430px; }
.mobile-brand { display: none; }
.login-title > span { color: #2f7cf6; font-size: 11px; font-weight: 700; letter-spacing: .2em; }
.login-title h2 { margin: 10px 0 8px; color: #101c34; font-size: 31px; line-height: 1.35; }
.login-title p { margin: 0 0 34px; color: #8a95a8; font-size: 14px; }

.field-label { display: block; margin: 0 0 9px; color: #40506a; font-size: 13px; font-weight: 600; }
.input-wrap { position: relative; margin-bottom: 20px; }
.input-wrap i {
    position: absolute;
    left: 17px;
    top: 50%;
    color: #91a0b6;
    font-size: 15px;
    transform: translateY(-50%);
}
.input-wrap input {
    width: 100%;
    height: 52px;
    padding: 0 16px 0 45px;
    border: 1px solid #dce3ee;
    border-radius: 10px;
    outline: 0;
    color: #1b2941;
    background: #fff;
    font-size: 14px;
    box-shadow: 0 5px 16px rgba(27,52,91,.035);
    transition: border-color .2s, box-shadow .2s;
}
.input-wrap input:focus { border-color: #2f7cf6; box-shadow: 0 0 0 4px rgba(47,124,246,.1); }
.input-wrap input::placeholder { color: #b0bac9; }

.captcha-row { display: grid; grid-template-columns: 1fr 112px; gap: 12px; align-items: start; }
.captcha-row .input-wrap { margin-bottom: 0; }
.captcha-image {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 52px;
    padding: 0;
    border: 1px solid #dce3ee;
    border-radius: 10px;
    cursor: pointer;
    background: #fff;
    overflow: hidden;
}
.captcha-image img { width: 100%; height: 100%; object-fit: cover; }

.login-button {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    height: 54px;
    margin-top: 30px;
    padding: 0 22px;
    border: 0;
    border-radius: 10px;
    cursor: pointer;
    color: #fff;
    background: linear-gradient(100deg, #1265e8, #358dfb);
    font-size: 15px;
    font-weight: 700;
    box-shadow: 0 14px 28px rgba(28,105,224,.25);
    transition: transform .2s, box-shadow .2s;
}
.login-button:hover { transform: translateY(-1px); box-shadow: 0 17px 32px rgba(28,105,224,.32); }
.login-button:active { transform: translateY(0); }

.security-tip { margin-top: 24px; color: #9aa4b5; font-size: 12px; text-align: center; }
.security-tip i { margin-right: 6px; color: #7d8ca3; }
.login-panel footer { position: absolute; bottom: 22px; color: #a3adbd; font-size: 11px; text-align: center; }

@media (max-width: 980px) {
    .login-shell { grid-template-columns: minmax(390px, .95fr) minmax(390px, 1.05fr); }
    .brand-panel { padding: 42px 44px; }
    .hero-copy h1 { font-size: 42px; }
    .feature-row { gap: 20px; }
}

@media (max-width: 760px) {
    .login-shell { display: block; background: linear-gradient(150deg, #071a3e, #1252a4); }
    .brand-panel { display: none; }
    .login-panel { min-height: 100vh; padding: 34px 22px 64px; background: transparent; }
    .login-card { padding: 30px 24px; border-radius: 18px; background: #f8faff; box-shadow: 0 24px 70px rgba(0,0,0,.2); }
    .mobile-brand { display: block; margin-bottom: 32px; color: #1d6de5; font-size: 15px; font-weight: 700; }
    .login-title h2 { font-size: 27px; }
    .login-panel footer { color: rgba(255,255,255,.55); }
}

@media (max-width: 380px) {
    .login-panel { padding-left: 14px; padding-right: 14px; }
    .login-card { padding: 26px 18px; }
    .captcha-row { grid-template-columns: 1fr 100px; }
}