/* ========== ACG / 二次元风格 UI ========== */
:root{
  --bg1:#ffe9f6;
  --bg2:#e9f1ff;
  --bg3:#eafff7;

  --card: rgba(255,255,255,.72);
  --border: rgba(255,255,255,.55);
  --shadow: 0 18px 40px rgba(35, 50, 90, .12);

  --text:#2b2d3a;
  --muted:#6b6f86;

  --p1:#ff6bd6;
  --p2:#7c6bff;
  --p3:#39d5ff;
  --ok:#2ee59d;

  --radius: 22px;
}

/* Reset */
*{
  margin:0;
  padding:0;
  box-sizing:border-box;
}

body{
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  color: var(--text);
  min-height:100vh;
  display:flex;
  justify-content:center;
  align-items:center;
  padding: 18px;

  /* 梦幻渐变 + 光斑 */
  background:
    radial-gradient(900px 600px at 12% 18%, rgba(255,107,214,.25), transparent 60%),
    radial-gradient(800px 520px at 85% 20%, rgba(57,213,255,.20), transparent 55%),
    radial-gradient(900px 650px at 55% 92%, rgba(124,107,255,.18), transparent 60%),
    linear-gradient(135deg, var(--bg1), var(--bg2), var(--bg3));
}

/* 卡片容器：玻璃拟态 + 软阴影 */
.container{
  width:100%;
  max-width:520px;
  padding: 26px 22px;
  border-radius: var(--radius);
  background: var(--card);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  position: relative;
  overflow: hidden;
}

/* 卡片顶部装饰：可爱彩带 */
.container::before{
  content:"";
  position:absolute;
  inset:-120px -120px auto auto;
  width: 260px;
  height: 260px;
  background: radial-gradient(circle at 30% 30%, rgba(255,107,214,.35), transparent 60%),
              radial-gradient(circle at 70% 60%, rgba(57,213,255,.28), transparent 55%),
              radial-gradient(circle at 40% 80%, rgba(124,107,255,.25), transparent 60%);
  transform: rotate(12deg);
  pointer-events:none;
}

h1{
  text-align:center;
  margin-bottom: 18px;
  font-size: 24px;
  letter-spacing: .5px;
  line-height: 1.2;

  /* 渐变字：二次元感 */
  background: linear-gradient(90deg, var(--p1), var(--p2), var(--p3));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 10px 22px rgba(124,107,255,.10);
}

.form-group{
  margin-bottom: 14px;
}

label{
  display:block;
  margin-bottom: 6px;
  font-size: 13px;
  color: var(--muted);
}

/* 输入框：软边 + 发光焦点 */
input[type="text"],
input[type="file"]{
  width:100%;
  padding: 12px 12px;
  border-radius: 14px;
  border: 1px solid rgba(140,160,210,.28);
  background: rgba(255,255,255,.78);
  color: var(--text);
  font-size: 14px;
  outline: none;
  transition: transform .15s ease, box-shadow .2s ease, border-color .2s ease;
}

input[type="text"]::placeholder{
  color: rgba(107,111,134,.65);
}

input[type="text"]:focus,
input[type="file"]:focus{
  border-color: rgba(124,107,255,.55);
  box-shadow:
    0 0 0 4px rgba(124,107,255,.16),
    0 10px 26px rgba(57,213,255,.10);
  transform: translateY(-1px);
}

/* 文件选择按钮（WebKit 可用） */
input[type="file"]::-webkit-file-upload-button{
  border: none;
  padding: 10px 12px;
  border-radius: 12px;
  margin-right: 10px;
  cursor: pointer;
  color: #fff;
  background: linear-gradient(90deg, var(--p2), var(--p3));
  box-shadow: 0 10px 18px rgba(57,213,255,.18);
  transition: transform .15s ease, filter .2s ease;
}
input[type="file"]::-webkit-file-upload-button:hover{
  filter: brightness(1.05);
  transform: translateY(-1px);
}

/* 主要按钮：果冻渐变 + 轻微弹跳 */
button.upload-btn{
  width:100%;
  border: none;
  border-radius: 16px;
  padding: 13px 18px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .4px;
  cursor: pointer;
  color: #fff;

  background: linear-gradient(90deg, var(--p1), var(--p2), var(--p3));
  box-shadow:
    0 16px 28px rgba(124,107,255,.20),
    0 10px 18px rgba(255,107,214,.12);
  transition: transform .12s ease, filter .2s ease, box-shadow .2s ease;
}

button.upload-btn:hover{
  filter: brightness(1.05) saturate(1.05);
  transform: translateY(-2px);
  box-shadow:
    0 18px 32px rgba(124,107,255,.24),
    0 12px 22px rgba(57,213,255,.14);
}

button.upload-btn:active{
  transform: translateY(0px) scale(.99);
}

/* 消息提示 */
#message{
  margin-top: 14px;
  text-align:center;
  font-size: 14px;
  color: var(--text);
}

/* 链接区 */
.centered-link{
  margin-top: 18px;
  text-align:center;
}

.centered-link a{
  text-decoration:none;
  font-size: 14px;
  color: rgba(43,45,58,.92);
  padding: 8px 10px;
  border-radius: 999px;
  background: rgba(255,255,255,.55);
  border: 1px solid rgba(140,160,210,.22);
  transition: transform .12s ease, box-shadow .2s ease, background .2s ease;
}

.centered-link a:hover{
  transform: translateY(-1px);
  background: rgba(255,255,255,.75);
  box-shadow: 0 10px 18px rgba(35,50,90,.10);
}

/* 说明小字 */
.hint-text{
  margin-top: 10px;
  text-align:center;
  font-size: 11px;
  color: rgba(107,111,134,.85);
}

/* GitHub 图标：轻微发光 */
.github-icon{
  width: 20px;
  margin-right: 6px;
  vertical-align: middle;
  filter: drop-shadow(0 6px 10px rgba(124,107,255,.18));
}

/* 响应式 */
@media (max-width: 600px){
  .container{
    padding: 20px 16px;
    border-radius: 20px;
  }
  h1{
    font-size: 20px;
  }
  button.upload-btn{
    padding: 12px 14px;
    font-size: 15px;
  }
  input[type="text"], input[type="file"]{
    padding: 11px 11px;
    font-size: 13px;
  }
}