/* ========== 基础重置 ========== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* ========== 页面背景 ========== */
body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family:
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        "PingFang SC",
        "Microsoft YaHei",
        sans-serif;
    /* 靠近 #212529 的渐变色 */
    background: linear-gradient(160deg, #212529 0%, #181b1e 40%, #14171a 100%);
    -webkit-font-smoothing: antialiased;
}

/* ========== 外层居中容器 ========== */
.login-wrapper {
    width: 100%;
    max-width: 400px;
    padding: 0 24px;
}

/* ========== 登录框 —— 半透明背景 ========== */
.login-box {
    background: rgba(255, 255, 255, 0.07);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 14px;
    padding: 44px 36px 38px;
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
}

/* ========== 标题 ========== */
.login-title {
    text-align: center;
    font-size: 24px;
    font-weight: 600;
    color: #e8e8e8;
    letter-spacing: 6px;
    margin-bottom: 34px;
}

/* ========== 输入组 ========== */
.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    font-size: 13px;
    color: #b0b0b0;
    margin-bottom: 7px;
    letter-spacing: 1px;
}

.input-group input {
    width: 100%;
    height: 44px;
    padding: 0 14px;
    font-size: 15px;
    color: #e0e0e0;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 8px;
    outline: none;
    transition: border-color 0.25s ease, background 0.25s ease;
}

.input-group input::placeholder {
    color: rgba(255, 255, 255, 0.28);
    font-size: 14px;
}

.input-group input:focus {
    border-color: #097bed;
    background: rgba(255, 255, 255, 0.09);
}

/* ========== 提交按钮 ========== */
.btn-submit {
    width: 100%;
    height: 44px;
    margin-top: 8px;
    font-size: 15px;
    font-weight: 600;
    color: #ffffff;
    background-color: #097bed;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    letter-spacing: 3px;
    transition: background-color 0.25s ease, transform 0.15s ease;
}

.btn-submit:hover {
    background-color: #0b6cd6;
}

.btn-submit:active {
    transform: scale(0.97);
}