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

:root {
  --glass-bg: rgba(255, 255, 255, 0.16);
  --glass-bg-strong: rgba(255, 255, 255, 0.26);
  --glass-border: rgba(255, 255, 255, 0.32);
  --glass-border-strong: rgba(255, 255, 255, 0.5);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
  --glass-shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.18);
  --text-primary: rgba(255, 255, 255, 0.95);
  --text-secondary: rgba(255, 255, 255, 0.7);
  --text-muted: rgba(255, 255, 255, 0.45);
  --success: #34d399;
  --error: #f87171;
  --warning: #fbbf24;
  --info: #60a5fa;
  --radius: 24px;
  --radius-sm: 14px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  min-height: 100vh;
  background: #0a0a1a;
  color: var(--text-primary);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ===== 动态背景 ===== */
.bg-layer {
  position: fixed; inset: 0; z-index: 0; overflow: hidden;
  background: linear-gradient(135deg, #0f0c29 0%, #302b63 40%, #24243e 100%);
}
.orb {
  position: absolute; border-radius: 50%; filter: blur(100px); opacity: 0.45; will-change: transform;
}
.orb-1 { width: 500px; height: 500px; background: radial-gradient(circle, #667eea, #764ba2); top: -120px; left: -80px; animation: float1 18s ease-in-out infinite; }
.orb-2 { width: 600px; height: 600px; background: radial-gradient(circle, #f093fb, #f5576c); bottom: -150px; right: -100px; animation: float2 22s ease-in-out infinite; }
.orb-3 { width: 400px; height: 400px; background: radial-gradient(circle, #4facfe, #00f2fe); top: 35%; left: 55%; animation: float3 25s ease-in-out infinite; }
.orb-4 { width: 350px; height: 350px; background: radial-gradient(circle, #43e97b, #38f9d7); top: 60%; left: 10%; animation: float1 20s ease-in-out infinite reverse; }
.orb-5 { width: 300px; height: 300px; background: radial-gradient(circle, #fa709a, #fee140); top: 15%; right: 20%; animation: float2 28s ease-in-out infinite reverse; }

@keyframes float1 { 0%,100%{transform:translate(0,0) scale(1)} 50%{transform:translate(80px,60px) scale(1.15)} }
@keyframes float2 { 0%,100%{transform:translate(0,0) scale(1)} 50%{transform:translate(-60px,-80px) scale(1.1)} }
@keyframes float3 { 0%,100%{transform:translate(0,0) scale(1)} 33%{transform:translate(-70px,50px) scale(.9)} 66%{transform:translate(50px,-40px) scale(1.05)} }

.grain {
  position: absolute; inset: 0; opacity: 0.03; pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ===== 布局 ===== */
.app { position: relative; z-index: 1; max-width: 900px; margin: 0 auto; padding: 28px 20px 60px; }
.main { display: flex; flex-direction: column; gap: 18px; }

/* ===== 液态玻璃基础 ===== */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  box-shadow: var(--glass-shadow);
  position: relative; overflow: hidden;
}
.glass::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--glass-border-strong), transparent); pointer-events: none;
}
.glass::after {
  content: ''; position: absolute; inset: 0; border-radius: inherit;
  background: linear-gradient(135deg, rgba(255,255,255,0.08) 0%, transparent 50%); pointer-events: none;
}

/* ===== 头部 ===== */
.header { padding: 18px 28px; margin-bottom: 18px; }
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.logo { display: flex; align-items: center; gap: 14px; }
.logo-icon {
  width: 48px; height: 48px; border-radius: 14px;
  background: linear-gradient(135deg, rgba(255,255,255,0.3), rgba(255,255,255,0.1));
  border: 1px solid var(--glass-border-strong);
  display: flex; align-items: center; justify-content: center; color: #fff;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15), inset 0 1px 0 rgba(255,255,255,0.4);
}
.logo-icon svg { width: 24px; height: 24px; }
.logo-text h1 { font-size: 19px; font-weight: 700; letter-spacing: -0.3px; display: flex; align-items: center; gap: 8px; }
.pro-badge {
  font-size: 10px; padding: 2px 8px; border-radius: 6px;
  background: linear-gradient(135deg, #f093fb, #f5576c);
  color: #fff; font-weight: 700; letter-spacing: 0.5px;
}
.logo-text span { font-size: 12px; color: var(--text-secondary); }
.stats { display: flex; gap: 20px; }
.stat { text-align: center; }
.stat span { display: block; font-size: 20px; font-weight: 700; }
.stat small { font-size: 11px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; }

/* ===== 拖拽区 ===== */
.drop-zone { padding: 40px 28px; text-align: center; transition: var(--transition); cursor: pointer; border: 2px dashed var(--glass-border); }
.drop-zone:hover, .drop-zone.drag-over { background: var(--glass-bg-strong); border-color: var(--glass-border-strong); transform: translateY(-2px); box-shadow: var(--glass-shadow-lg); }
.drop-zone.drag-over { border-color: #fff; }
.drop-inner { display: flex; flex-direction: column; align-items: center; gap: 10px; }
.drop-icon-wrap { position: relative; width: 76px; height: 76px; margin-bottom: 6px; }
.drop-icon {
  width: 76px; height: 76px; border-radius: 50%;
  background: linear-gradient(135deg, rgba(255,255,255,0.25), rgba(255,255,255,0.08));
  border: 1px solid var(--glass-border-strong);
  display: flex; align-items: center; justify-content: center; color: #fff;
  box-shadow: 0 8px 24px rgba(0,0,0,0.2), inset 0 1px 0 rgba(255,255,255,0.5);
  animation: pulse 3s ease-in-out infinite;
}
.drop-icon svg { width: 34px; height: 34px; }
.drop-ring { position: absolute; inset: -8px; border-radius: 50%; border: 2px solid rgba(255,255,255,0.2); animation: ringPulse 3s ease-in-out infinite; }
@keyframes pulse { 0%,100%{transform:scale(1)} 50%{transform:scale(1.05)} }
@keyframes ringPulse { 0%,100%{transform:scale(1);opacity:.5} 50%{transform:scale(1.15);opacity:0} }
.drop-inner h2 { font-size: 21px; font-weight: 600; }
.drop-inner > p { color: var(--text-secondary); font-size: 13px; }

.format-cats { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; margin: 6px 0; max-width: 600px; }
.cat-tag {
  padding: 4px 10px; border-radius: 20px;
  background: rgba(255,255,255,0.08); border: 1px solid var(--glass-border);
  font-size: 11px; color: var(--text-secondary); backdrop-filter: blur(10px);
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 28px; border: none; border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 600; font-family: inherit; cursor: pointer;
  transition: var(--transition); color: #fff; position: relative; overflow: hidden;
}
.btn svg { width: 18px; height: 18px; }
.btn-sm { padding: 8px 16px; font-size: 13px; }
.btn-glow {
  background: linear-gradient(135deg, rgba(255,255,255,0.25), rgba(255,255,255,0.1));
  border: 1px solid var(--glass-border-strong);
  box-shadow: 0 4px 16px rgba(0,0,0,0.15), inset 0 1px 0 rgba(255,255,255,0.4);
  backdrop-filter: blur(10px);
}
.btn-glow:hover { background: linear-gradient(135deg, rgba(255,255,255,0.35), rgba(255,255,255,0.15)); transform: translateY(-1px); }
.btn-glow:active { transform: translateY(0); }
.btn-ghost { background: transparent; border: 1px solid var(--glass-border); color: var(--text-secondary); }
.btn-ghost:hover { background: rgba(255,255,255,0.1); color: #fff; }
.btn-convert {
  width: 100%; margin-top: 18px; padding: 15px; font-size: 15px;
  background: linear-gradient(135deg, #667eea, #764ba2);
  border: 1px solid rgba(255,255,255,0.3);
  box-shadow: 0 8px 32px rgba(102,126,234,0.4), inset 0 1px 0 rgba(255,255,255,0.3);
}
.btn-convert:hover { transform: translateY(-2px); box-shadow: 0 12px 40px rgba(102,126,234,0.5); }
.btn-convert:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

/* ===== 面板通用 ===== */
.panel-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 18px; }
.panel-head h3 { font-size: 16px; font-weight: 600; }
.badge {
  padding: 4px 12px; border-radius: 20px;
  background: rgba(255,255,255,0.12); border: 1px solid var(--glass-border);
  font-size: 12px; color: var(--text-secondary);
}
.badge-live { background: rgba(52,211,153,0.2); border-color: rgba(52,211,153,0.4); color: var(--success); animation: blink 1.5s ease-in-out infinite; }
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:.6} }

/* ===== 文件列表 ===== */
.file-panel, .format-panel, .settings-panel, .progress-panel, .result-panel { padding: 22px 26px; }
.file-list { display: flex; flex-direction: column; gap: 10px; }
.file-item {
  display: flex; align-items: center; gap: 14px; padding: 12px 16px;
  border-radius: var(--radius-sm); background: rgba(255,255,255,0.08);
  border: 1px solid var(--glass-border); transition: var(--transition);
}
.file-item:hover { background: rgba(255,255,255,0.12); }
.file-icon {
  width: 40px; height: 40px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center; font-size: 20px; flex-shrink: 0;
  background: rgba(255,255,255,0.1);
}
.file-info { flex: 1; min-width: 0; }
.file-name { font-size: 14px; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.file-meta { font-size: 12px; color: var(--text-muted); margin-top: 2px; }
.file-remove {
  width: 28px; height: 28px; border-radius: 50%; border: none;
  background: rgba(255,255,255,0.1); color: var(--text-secondary); cursor: pointer;
  display: flex; align-items: center; justify-content: center; transition: var(--transition); flex-shrink: 0;
}
.file-remove:hover { background: rgba(248,113,113,0.3); color: #fff; }

/* ===== 格式选择器 ===== */
.format-search-wrap { position: relative; margin-bottom: 14px; }
.search-icon { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); width: 18px; height: 18px; color: var(--text-muted); }
.format-search-wrap input {
  width: 100%; padding: 12px 16px 12px 42px; border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.1); border: 1px solid var(--glass-border);
  color: #fff; font-size: 14px; font-family: inherit; transition: var(--transition);
}
.format-search-wrap input::placeholder { color: var(--text-muted); }
.format-search-wrap input:focus { outline: none; border-color: var(--glass-border-strong); background: rgba(255,255,255,0.15); }

.cat-tabs { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 16px; }
.cat-tab {
  padding: 6px 14px; border-radius: 20px; border: 1px solid var(--glass-border);
  background: rgba(255,255,255,0.06); color: var(--text-secondary);
  font-size: 12px; cursor: pointer; transition: var(--transition); font-family: inherit;
}
.cat-tab:hover { background: rgba(255,255,255,0.12); color: #fff; }
.cat-tab.active {
  background: linear-gradient(135deg, rgba(102,126,234,0.5), rgba(118,75,162,0.5));
  border-color: var(--glass-border-strong); color: #fff; font-weight: 600;
}

.format-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 8px; max-height: 320px; overflow-y: auto; padding: 4px;
}
.format-grid::-webkit-scrollbar { width: 6px; }
.format-grid::-webkit-scrollbar-track { background: transparent; }
.format-grid::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.2); border-radius: 3px; }

.format-card {
  padding: 10px 12px; border-radius: 10px; border: 1px solid var(--glass-border);
  background: rgba(255,255,255,0.06); cursor: pointer; transition: var(--transition);
  display: flex; flex-direction: column; gap: 2px;
}
.format-card:hover { background: rgba(255,255,255,0.14); transform: translateY(-1px); border-color: var(--glass-border-strong); }
.format-card.selected {
  background: linear-gradient(135deg, rgba(102,126,234,0.4), rgba(118,75,162,0.3));
  border-color: rgba(255,255,255,0.6); box-shadow: 0 4px 16px rgba(102,126,234,0.3);
}
.fc-ext { font-size: 14px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.3px; }
.fc-name { font-size: 10px; color: var(--text-muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.fc-support {
  display: inline-block; font-size: 9px; padding: 1px 6px; border-radius: 4px; margin-top: 2px;
  align-self: flex-start;
}
.fc-support.full { background: rgba(52,211,153,0.25); color: var(--success); }
.fc-support.partial { background: rgba(251,191,36,0.25); color: var(--warning); }
.fc-support.none { background: rgba(255,255,255,0.1); color: var(--text-muted); }

.selected-format {
  margin-top: 14px; padding: 12px 16px; border-radius: var(--radius-sm);
  background: rgba(102,126,234,0.15); border: 1px solid rgba(102,126,234,0.4);
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
}
.sf-label { font-size: 12px; color: var(--text-secondary); }
.sf-name { font-size: 16px; font-weight: 700; text-transform: uppercase; }
.sf-desc { font-size: 12px; color: var(--text-secondary); flex: 1; }
.sf-badge { font-size: 11px; padding: 2px 10px; border-radius: 10px; font-weight: 600; }
.sf-badge.full { background: rgba(52,211,153,0.3); color: var(--success); }
.sf-badge.partial { background: rgba(251,191,36,0.3); color: var(--warning); }
.sf-badge.none { background: rgba(255,255,255,0.15); color: var(--text-muted); }

/* ===== 设置面板 ===== */
.settings-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; }
.setting { display: flex; flex-direction: column; gap: 6px; }
.setting label { font-size: 12px; color: var(--text-secondary); font-weight: 500; }
.select-wrap { position: relative; }
.select-wrap select {
  width: 100%; padding: 10px 36px 10px 14px; border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.1); border: 1px solid var(--glass-border);
  color: #fff; font-size: 14px; font-family: inherit; cursor: pointer; appearance: none; -webkit-appearance: none; transition: var(--transition);
}
.select-wrap select:hover { background: rgba(255,255,255,0.15); }
.select-wrap select:focus { outline: none; border-color: var(--glass-border-strong); }
.select-wrap select option { background: #2a2a4a; color: #fff; }
.chev { position: absolute; right: 12px; top: 50%; transform: translateY(-50%); width: 16px; height: 16px; color: var(--text-muted); pointer-events: none; }
.setting input[type="number"], .setting input[type="text"] {
  width: 100%; padding: 10px 14px; border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.1); border: 1px solid var(--glass-border);
  color: #fff; font-size: 14px; font-family: inherit; transition: var(--transition);
}
.setting input::placeholder { color: var(--text-muted); }
.setting input:focus { outline: none; border-color: var(--glass-border-strong); background: rgba(255,255,255,0.15); }

.engine-notice {
  margin-top: 14px; padding: 12px 16px; border-radius: var(--radius-sm);
  background: rgba(251,191,36,0.12); border: 1px solid rgba(251,191,36,0.35);
  display: flex; align-items: center; gap: 10px; font-size: 13px; color: var(--warning);
}
.engine-notice svg { width: 18px; height: 18px; flex-shrink: 0; }

/* ===== 进度 ===== */
.progress-bar-wrap { width: 100%; height: 8px; border-radius: 4px; background: rgba(255,255,255,0.1); overflow: hidden; margin-bottom: 14px; }
.progress-bar {
  height: 100%; width: 0%; border-radius: 4px;
  background: linear-gradient(90deg, #667eea, #764ba2, #f093fb); background-size: 200% 100%;
  transition: width 0.3s ease; animation: shimmer 2s linear infinite;
}
@keyframes shimmer { 0%{background-position:200% 0} 100%{background-position:-200% 0} }
.progress-list { display: flex; flex-direction: column; gap: 8px; }
.progress-item { display: flex; align-items: center; gap: 10px; padding: 8px 12px; border-radius: 10px; background: rgba(255,255,255,0.06); font-size: 13px; }
.progress-item .pi-name { flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.progress-item .pi-status { font-size: 12px; color: var(--text-muted); flex-shrink: 0; }
.progress-item.done .pi-status { color: var(--success); }
.progress-item.error .pi-status { color: var(--error); }

/* ===== 结果 ===== */
.result-list { display: flex; flex-direction: column; gap: 10px; margin-bottom: 14px; }
.result-item {
  display: flex; align-items: center; gap: 14px; padding: 14px 16px;
  border-radius: var(--radius-sm); background: rgba(52,211,153,0.08); border: 1px solid rgba(52,211,153,0.25);
}
.result-item .file-icon { background: rgba(52,211,153,0.15); }
.result-info { flex: 1; min-width: 0; }
.result-name { font-size: 14px; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.result-meta { font-size: 12px; color: var(--text-muted); margin-top: 2px; }
.result-size { font-size: 13px; color: var(--success); font-weight: 600; flex-shrink: 0; }
.download-btn {
  padding: 8px 16px; border-radius: 10px; border: none;
  background: linear-gradient(135deg, #34d399, #10b981); color: #fff;
  font-size: 13px; font-weight: 600; font-family: inherit; cursor: pointer;
  display: flex; align-items: center; gap: 6px; transition: var(--transition); flex-shrink: 0;
}
.download-btn:hover { transform: translateY(-1px); box-shadow: 0 4px 16px rgba(52,211,153,0.4); }
.download-btn svg { width: 14px; height: 14px; }

/* ===== 底部 ===== */
.footer { padding: 14px 26px; margin-top: 18px; text-align: center; }
.footer p { font-size: 11px; color: var(--text-muted); line-height: 1.5; }

/* ===== Toast ===== */
.toast-container { position: fixed; top: 24px; right: 24px; z-index: 9999; display: flex; flex-direction: column; gap: 10px; }
.toast {
  padding: 14px 20px; border-radius: var(--radius-sm);
  background: rgba(30,30,50,0.92); backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border); color: #fff; font-size: 14px;
  box-shadow: var(--glass-shadow-lg); animation: toastIn 0.3s ease, toastOut 0.3s ease 2.7s forwards; max-width: 360px;
}
.toast.success { border-color: rgba(52,211,153,0.5); }
.toast.error { border-color: rgba(248,113,113,0.5); }
.toast.warning { border-color: rgba(251,191,36,0.5); }
@keyframes toastIn { from{opacity:0;transform:translateX(40px)} to{opacity:1;transform:translateX(0)} }
@keyframes toastOut { to{opacity:0;transform:translateX(40px)} }

/* ===== 响应式 ===== */
@media (max-width: 640px) {
  .app { padding: 18px 14px 40px; }
  .header { padding: 14px 18px; }
  .logo-text h1 { font-size: 16px; }
  .stats { gap: 12px; }
  .stat span { font-size: 16px; }
  .drop-zone { padding: 28px 18px; }
  .drop-inner h2 { font-size: 17px; }
  .file-panel, .format-panel, .settings-panel, .progress-panel, .result-panel { padding: 16px 14px; }
  .settings-grid { grid-template-columns: 1fr; }
  .format-grid { grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); max-height: 260px; }
  .format-cats { gap: 5px; }
  .cat-tag { font-size: 10px; padding: 3px 8px; }
}