/* ============================================================
   音频 MIDI 扒谱平台 — 前端样式
   原生 CSS，无构建；适配电脑浏览器，窄屏纵向堆叠。
   ============================================================ */

:root {
  --bg: #f4f6f9;
  --card: #ffffff;
  --text: #1f2430;
  --muted: #6b7280;
  --line: #e5e8ee;
  --primary: #2f6fed;
  --primary-dark: #245bc7;
  --warn: #d98324;
  --danger: #c9483b;
  --ok: #2e9e6b;
  --radius: 12px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", "Noto Sans SC", sans-serif;
  line-height: 1.6;
}

/* ---- 顶栏 ---- */
.topbar {
  background: var(--card);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 18px 20px;
  display: flex;
  align-items: baseline;
  gap: 14px;
}
.topbar h1 { font-size: 20px; margin: 0; }
.topbar-sub { color: var(--muted); font-size: 13px; }

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

/* ---- 卡片 ---- */
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
}
.card h2 { font-size: 17px; margin: 0 0 16px; }
.card h3 { font-size: 14px; margin: 18px 0 10px; color: var(--text); }
.hidden { display: none !important; }

/* ---- 上传区 ---- */
.dropzone {
  border: 2px dashed var(--line);
  border-radius: var(--radius);
  padding: 34px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color .15s, background .15s;
}
.dropzone:hover, .dropzone.dragover {
  border-color: var(--primary);
  background: #f0f5ff;
}
.dropzone-title { font-size: 15px; margin: 0 0 6px; }
.dropzone-hint { color: var(--muted); font-size: 13px; margin: 0; }
.file-meta { margin: 10px 0 0; font-size: 13px; color: var(--muted); }

/* ---- 档位选择 ---- */
.mode-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.mode-card {
  display: block;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
  cursor: pointer;
}
.mode-card input { margin-right: 8px; }
.mode-card:has(input:checked) {
  border-color: var(--primary);
  background: #f0f5ff;
}
.mode-name { font-weight: 600; display: block; margin-bottom: 4px; }
.mode-desc { font-size: 12.5px; color: var(--muted); }

.check-line {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  margin-top: 14px;
}
.check-line.inline { margin: 0; }

/* ---- 乐器面板 ---- */
.panel {
  margin-top: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
  background: #fafbfc;
}
.panel-tip { font-size: 12.5px; color: var(--muted); margin: 0 0 10px; }
.instrument-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
}
.instrument-list label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
}

/* ---- 按钮 ---- */
.btn {
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--text);
  border-radius: 10px;
  padding: 9px 16px;
  font-size: 14px;
  cursor: pointer;
}
.btn:hover { border-color: var(--primary); color: var(--primary); }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-dark); color: #fff; }
.btn.warn { border-color: var(--warn); color: var(--warn); }
.btn.warn:hover { background: #fdf3e7; }
.btn.ghost { background: transparent; }
.btn:disabled { opacity: .45; cursor: not-allowed; }

/* ---- 进度 ---- */
.progress-row { display: flex; flex-direction: column; gap: 6px; margin-bottom: 12px; }
.stage-text { font-weight: 600; font-size: 15px; }
.stage-message { color: var(--muted); font-size: 13px; }
.progress-bar {
  height: 10px;
  border-radius: 999px;
  background: var(--line);
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  width: 0;
  background: var(--primary);
  border-radius: 999px;
  transition: width .3s ease;
}

/* ---- 结果 ---- */
.result-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.result-actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.preview-note { font-size: 12.5px; color: var(--muted); margin: 10px 0; }

.stem-list { display: flex; flex-direction: column; gap: 14px; }
.stem-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
}
.stem-top {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}
.stem-check { margin: 0; }
.stem-name { font-weight: 600; flex: 1; min-width: 0; }
.stem-player { width: 100%; margin-bottom: 10px; }
.stem-links { display: flex; flex-wrap: wrap; gap: 10px; }
.stem-links a {
  font-size: 13px;
  color: var(--primary);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 6px 12px;
}
.stem-links a:hover { border-color: var(--primary); }
.stem-links a.disabled { color: var(--muted); pointer-events: none; }

/* ---- 重处理 ---- */
.rp-warning {
  background: #fdf3e7;
  border: 1px solid var(--warn);
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 13px;
  color: var(--warn);
}

/* ---- 提示 ---- */
.notes { display: flex; flex-direction: column; gap: 10px; }
.note { font-size: 12.5px; color: var(--muted); margin: 0; }
.note.disclaimer { color: var(--warn); }
.form-error { color: var(--danger); font-size: 13px; margin-top: 12px; }

/* ---- 窄屏 ---- */
@media (max-width: 640px) {
  .mode-grid { grid-template-columns: 1fr; }
  .result-head { flex-direction: column; align-items: flex-start; }
}