/* 背景渐变 */
body {
    margin: 0;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, rgb(214, 238, 250), rgb(180, 222, 250), rgb(240, 248, 255));
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

/* 白色容器（液态玻璃效果 + 新颜色） */
.container {
    position: relative;
    z-index: 998;
    width: 25vw;
    max-width: 500px;
    min-width: 280px;
    margin: 40px;
    padding: 25px;
    text-align: center;
    border-radius: 20px;
    border: 0px solid rgba(255,255,255,0.25);
 /* 静态液态玻璃效果 */
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(8px) saturate(180%) brightness(1.1) contrast(1.05);
    -webkit-backdrop-filter: blur(20px) saturate(180%) brightness(1.1) contrast(1.05);
    box-shadow: 0 8px 30px rgba(0,0,0,0.1);
    color: #333;
    flex-shrink: 0;
    transform: translateY(-30px);
    animation: fadeSlideDown 0.8s ease-out forwards;
    will-change: transform, opacity;
}

/* 标题 */
.container h1 {
    margin-bottom: 20px;
    font-size: 24px;
    color: #2d3e50;
}

/* 表单组居中排列 */
.form-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 15px;
}

/* 下拉框和输入框统一样式（液态玻璃） */
select, input[type="number"] {
    width: 60%;                   /* 宽度统一 */
    padding: 10px 14px;           /* 内边距统一 */
    border-radius: 12px;
    border: 0px solid rgba(255,255,255,0.3);
    font-size: 16px;
    margin: 10px 0 15px 0;        /* 上下间距统一，下方留空间 */
    text-align: center;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(8px) saturate(180%) brightness(1.05);
    -webkit-backdrop-filter: blur(12px) saturate(180%) brightness(1.05);
    color: #333;
    outline: none;
    cursor: pointer;
    box-sizing: border-box;       /* 保证内边距不影响宽度 */
}
/* 容器 */
.custom-select-wrapper {
  position: relative;
  display: inline-block;
  width: 260px;
  font-size: 16px;
  margin-bottom: 15px; /* 控制选择框与下方输入框的距离 */
}

/* 外层玻璃框 */
.custom-select {
  position: relative;
  user-select: none;
}

/* 选中项（始终可见） */
.select-selected {
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(8px) saturate(180%) brightness(1.05);
  -webkit-backdrop-filter: blur(12px) saturate(180%) brightness(1.05);
  border-radius: 12px;
  padding: 10px 14px;
  cursor: pointer;
  border: 0px solid rgba(255,255,255,0.3);
  color: #333;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
  position: relative;
}

/* 倒三角箭头 */
.select-selected::after {
  content: "▼";
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 14px;
  color: #6e8efb;
  transition: transform 0.3s ease;
}

/* 激活时箭头旋转 */
.select-selected.active::after {
  transform: translateY(-50%) rotate(180deg);
}

/* 下拉项容器 */
.select-items {
  position: absolute;
  background: rgba(17,30,44, 1);
  backdrop-filter: blur(8px) saturate(180%);
  -webkit-backdrop-filter: blur(14px) saturate(180%);
  border-radius: 12px;
  margin-top: 6px;
  width: 100%;
  z-index: 99;
  border: 0px solid rgba(255,255,255,0.3);
  box-shadow: 0 8px 25px rgba(0,0,0,0.15);
  overflow: hidden;
  display: none; /* 默认隐藏 */
  animation: fadeSlide 0.25s ease forwards;
}

/* 下拉项 */
.select-items div {
  padding: 10px 14px;
  cursor: pointer;
  color: #333;
  transition: background 0.25s ease;
}

/* hover 效果 */
.select-items div:hover {
  background: rgba(242, 230, 215,0.08);
}

/* 动画 */
@keyframes fadeSlide {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 鼠标悬停改变边框颜色 */
select:hover, input[type="number"]:hover {
    border-color: rgba(100, 180, 250, 0.8);
}


/* 按钮（液态玻璃效果） */
button {
    display: block;
    margin: 0 auto 20px auto;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(8px) saturate(180%) brightness(1.05);
    -webkit-backdrop-filter: blur(12px) saturate(180%) brightness(1.05);
    color: #333;
    border: none;
    padding: 12px 20px;
    border-radius: 15px;
    font-size: 16px;
    cursor: pointer;
    transition: transform 0.25s ease, background 0.25s ease, box-shadow 0.25s ease;
}

button:hover {
    transform: scale(1.03);
    background: rgba(255,255,255,0.05);
    box-shadow: 0 6px 18px rgba(0,0,0,0.15);
}

button:active {
    transform: scale(0.97);
}

/* 进度环（液态玻璃底） */
.progress-ring {
    position: relative;
    width: 150px;
    height: 150px;
    margin: 20px auto;
}

.progress-ring svg {
    transform: rotate(-90deg);
    width: 150px;
    height: 150px;
}

.progress-ring circle {
    fill: transparent;
    stroke-width: 12;
    stroke-linecap: round;
}

.progress-ring circle.bg {
    stroke: rgba(255,255,255,0.05);
}

.progress-ring circle.progress {
    stroke: rgb(100, 180, 250);
    stroke-dasharray: 339.292; /* 2*PI*54 */
    stroke-dashoffset: 339.292;
    transition: stroke-dashoffset 0.2s linear;
}

/* 中心文字 */
.progress-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 16px;
    font-weight: bold;
    color: #333;
    pointer-events: none;
    white-space: nowrap; /* 防止换行 */
    text-align: center;  /* 水平居中 */
}


/* 测速结果 */
.results {
    margin-top: 15px;
    font-size: 16px;
    color: #333;
}

.results p {
    margin: 5px 0;
}

/* 动画关键帧 */
@keyframes fadeSlideDown {
    0% {
        opacity: 0;
        transform: translateY(-30px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 允许输入框选中文本 */
input[type="number"] {
    user-select: text;
}

/* 全局禁止文本选择 */
body, button, select, .container, .form-group {
    user-select: none;
}
/* ------------------ 动画 ------------------ */
@keyframes fadeSlideDown { 0% {opacity:0; transform:translateY(-30px);} 100%{opacity:1; transform:translateY(0);} }
@keyframes fadeInFooter { 0% {opacity:0; transform:translateY(20px);} 100% {opacity:1; transform:translateY(0);} }
@keyframes float-up {0%{transform:translateY(0) scale(1);opacity:1;}100%{transform:translateY(-30px) scale(1.5);opacity:0;}}


/* ------------------ 爱心动画 ------------------ */
.heart {
  position: absolute;
  font-size: 18px;
  pointer-events: none;
  animation: float-up 1s ease-out forwards;
  will-change: transform, opacity; /* ⚡ 提前告知浏览器优化 */
}

input[type="text"],
textarea {
  user-select: text;
  -webkit-user-select: text;
  -moz-user-select: text;
  -ms-user-select: text;
}
/* ------------------ 文件上传验证白名单 ------------------ */
.file-verify {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 20px;
}

.file-verify input[type="file"] {
    display: none; /* 文件选择框隐藏，由按钮触发 */
}

.file-verify button {
    width: 200px;
    padding: 12px 20px;
    border-radius: 15px;
    font-size: 16px;
    cursor: pointer;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(8px) saturate(180%) brightness(1.05);
    -webkit-backdrop-filter: blur(12px) saturate(180%) brightness(1.05);
    border: 0px solid rgba(255,255,255,0.3);
    color: #333;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    transition: transform 0.25s ease, background 0.25s ease, box-shadow 0.25s ease;
}

.file-verify button:hover {
    transform: scale(1.03);
    background: rgba(255,255,255,0.05);
    box-shadow: 0 6px 18px rgba(0,0,0,0.15);
}

.file-verify button:active {
    transform: scale(0.97);
}

/* 文本提示（可选） */
.file-verify p {
    margin-top: 8px;
    font-size: 14px;
    color: #666;
    text-align: center;
}
/* ------------------ 强制 GPU 渲染，优化模糊层 ------------------ */
button,
input,
textarea,
.icon-img,
.lang-btn {
  will-change: transform, opacity, backdrop-filter;
  transform: translateZ(0); /* 提升渲染性能并避免闪黑 */
}

/* ------------------ 调整全局用户选择，仅禁止非交互元素 ------------------ */
body *:not(input):not(textarea):not(button) {
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  -webkit-touch-callout: none;
  -webkit-user-drag: none;
}
/* ------------------ 背景元素 ------------------ */

/* 渐变兜底 */
body {
background: linear-gradient(135deg, #1f1f1f, #3c4a57, #7a8a99);
  );
  background-attachment: fixed;
  position: relative;
  z-index: 0;
}

/* 背景图层 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background: var(--bg) no-repeat center/cover;
  opacity: 1; /* 想要透明度可调，改这里 */
}

/* ------------------ 动态文字颜色 ------------------ */
:root {
  --dynamic-text-color: #333;
}

h1, h2, h3, p, a, .subtitle, 
.lang-btn, .lang-dropdown a, 
.engine-dropdown div, .copyright, 
input, input::placeholder, 
button {
  color: var(--dynamic-text-color) !important;
}
/* ========== 自定义数字输入框（玻璃加减按钮） ========== */
.number-wrapper {
  position: relative;
  display: inline-flex;
  align-items: center;
  width: 60%; /* 和之前 select/input 一致 */
  margin: 10px 0 15px 0;
}

.number-wrapper input[type="number"] {
  flex: 1;
  padding: 10px 14px;
  text-align: center;
  border-radius: 12px;
  border: 0px solid rgba(255,255,255,0.3);
  font-size: 16px;
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(8px) saturate(180%) brightness(1.05);
  -webkit-backdrop-filter: blur(12px) saturate(180%) brightness(1.05);
  color: #333;
  outline: none;
  box-sizing: border-box;
  -moz-appearance: textfield; /* Firefox 隐藏箭头 */
}

/* 隐藏默认箭头 (Chrome/Safari/Edge) */
.number-wrapper input[type=number]::-webkit-inner-spin-button,
.number-wrapper input[type=number]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

/* 自定义加减按钮 */
.number-wrapper button {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(8px) saturate(180%) brightness(1.05);
  -webkit-backdrop-filter: blur(12px) saturate(180%) brightness(1.05);
  border: 0px solid rgba(255,255,255,0.3);
  color: #333;
  padding: 6px 10px;
  cursor: pointer;
  border-radius: 8px;
  font-size: 14px;
  transition: background 0.25s ease, transform 0.25s ease;
}

.number-wrapper button:hover {
  background: rgba(255,255,255,0.1);
  transform: translateY(-50%) scale(1.05);
}

.number-wrapper button:active {
  transform: translateY(-50%) scale(0.95);
}

.number-wrapper .minus { left: -40px; }
.number-wrapper .plus { right: -40px; }