body {
    margin: 0;
    font-family: Arial, sans-serif;
    min-height: 100vh;
    background-color: #0b2d47;
    background-image:
        radial-gradient(ellipse 100% 70% at 50% -10%, rgba(255, 214, 102, 0.45) 0%, transparent 52%),
        radial-gradient(ellipse 55% 45% at 92% 8%, rgba(255, 255, 255, 0.18) 0%, transparent 48%),
        linear-gradient(168deg, #1e6b9e 0%, #124a6e 28%, #0a3554 58%, #061f33 100%);
    background-attachment: fixed;
}

.login-container {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    overflow: hidden;
}

/* 低调阵列感，呼应光伏板排布与监控界面栅格 */
.login-container::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background-image:
        repeating-linear-gradient(
            90deg,
            transparent 0,
            transparent 56px,
            rgba(255, 255, 255, 0.04) 56px,
            rgba(255, 255, 255, 0.04) 57px
        ),
        repeating-linear-gradient(
            0deg,
            transparent 0,
            transparent 38px,
            rgba(0, 0, 0, 0.06) 38px,
            rgba(0, 0, 0, 0.06) 39px
        );
    mask-image: radial-gradient(ellipse 85% 75% at 50% 45%, black 20%, transparent 72%);
    -webkit-mask-image: radial-gradient(ellipse 85% 75% at 50% 45%, black 20%, transparent 72%);
}

.login-card {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 420px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 12px 40px rgba(6, 31, 51, 0.35), 0 0 0 1px rgba(255, 255, 255, 0.08);
    padding: 24px;
}

.login-card h1 {
    margin: 0 0 8px;
    font-size: 22px;
}

.subtitle {
    color: #666;
    margin: 0 0 18px;
}

label {
    display: block;
    margin: 12px 0 6px;
    font-size: 14px;
}

input {
    width: 100%;
    box-sizing: border-box;
    border: 1px solid #d9d9d9;
    border-radius: 8px;
    padding: 10px 12px;
}

button {
    margin-top: 16px;
    width: 100%;
    border: 0;
    background: #1677ff;
    color: #fff;
    padding: 10px 12px;
    border-radius: 8px;
    cursor: pointer;
}

.error-box {
    margin-top: 12px;
    background: #fff1f0;
    color: #cf1322;
    border: 1px solid #ffa39e;
    border-radius: 8px;
    padding: 8px 10px;
    font-size: 13px;
}