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

:root {
  --primary: #4f6ef7;
  --primary-dark: #3a55d8;
  --bg: #f4f6fb;
  --card: #ffffff;
  --text: #1f2430;
  --text-light: #6b7280;
  --border: #e5e9f2;
  --danger: #e5484d;
  --radius: 12px;
}

body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ===== 顶栏 ===== */
.topbar {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 14px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand { display: flex; align-items: center; gap: 12px; }
.brand .logo { font-size: 30px; }
.brand h1 { font-size: 20px; font-weight: 700; }
.brand p { font-size: 12px; color: var(--text-light); margin-top: 2px; }

.account { display: flex; align-items: center; gap: 10px; font-size: 14px; }
.account .user-chip {
  background: #eef1fe;
  color: var(--primary-dark);
  padding: 6px 12px;
  border-radius: 999px;
  font-weight: 600;
}

/* ===== 布局 ===== */
.container {
  flex: 1;
  width: 100%;
  max-width: 860px;
  margin: 0 auto;
  padding: 28px 20px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: 0 1px 3px rgba(16, 24, 40, 0.05);
}

/* ===== 上传区 ===== */
.dropzone {
  border: 2px dashed #c7d2fe;
  border-radius: var(--radius);
  padding: 40px 20px;
  text-align: center;
  cursor: pointer;
  transition: all .15s ease;
  background: #fafbff;
}
.dropzone:hover, .dropzone.dragover { border-color: var(--primary); background: #eef1fe; }
.dropzone-icon { font-size: 40px; }
.dropzone-title { margin-top: 10px; font-weight: 600; font-size: 15px; }
.dropzone-hint { margin-top: 6px; font-size: 12px; color: var(--text-light); }

.preview-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
}
.preview-item {
  position: relative;
  width: 96px;
  height: 96px;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--border);
}
.preview-item img { width: 100%; height: 100%; object-fit: cover; }
.preview-item .remove {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: rgba(0, 0, 0, .55);
  color: #fff;
  font-size: 12px;
  line-height: 20px;
  text-align: center;
  cursor: pointer;
  border: none;
}
.preview-item .remove:hover { background: var(--danger); }

/* ===== 提问与按钮 ===== */
.prompt-row { display: flex; gap: 12px; margin-top: 18px; }
.prompt-input {
  flex: 1;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 14px;
  outline: none;
  transition: border-color .15s;
}
.prompt-input:focus { border-color: var(--primary); }

.btn {
  border: none;
  border-radius: 10px;
  padding: 12px 22px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all .15s;
}
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--primary-dark); }
.btn-ghost { background: transparent; border: 1px solid var(--border); color: var(--text-light); }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn-block { width: 100%; margin-top: 6px; }

/* ===== 结果区 ===== */
.result-head { display: flex; align-items: center; justify-content: space-between; }
.result-head h2 { font-size: 16px; }
.result-body {
  margin-top: 14px;
  background: #f8f9fc;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  font-size: 14px;
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 480px;
  overflow-y: auto;
}
.result-meta { margin-top: 10px; font-size: 12px; color: var(--text-light); }

/* ===== 加载态 ===== */
.loading { display: inline-flex; align-items: center; gap: 10px; }
.spinner {
  width: 18px; height: 18px;
  border: 2px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== 模态框 ===== */
.modal-mask {
  position: fixed;
  inset: 0;
  background: rgba(15, 20, 35, .45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}
.modal {
  background: var(--card);
  border-radius: 14px;
  padding: 28px;
  width: 380px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, .2);
}
.modal h2 { font-size: 18px; }
.modal-desc { font-size: 13px; color: var(--text-light); margin: 6px 0 16px; }
.modal-input {
  width: 100%;
  padding: 11px 13px;
  margin-bottom: 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 14px;
  outline: none;
}
.modal-input:focus { border-color: var(--primary); }
.modal-error { color: var(--danger); font-size: 13px; min-height: 18px; margin-bottom: 4px; }

/* ===== 页脚 ===== */
.footer {
  text-align: center;
  padding: 18px;
  font-size: 12px;
  color: var(--text-light);
}