:root {
  --bg: #0f1117;
  --panel: #1a1d27;
  --panel-2: #222633;
  --border: #2e3345;
  --text: #e8eaf0;
  --muted: #8a91a5;
  --accent: #4f7cff;
  --accent-2: #6c5ce7;
  --gold: #f5b544;
  --danger: #ff5d5d;
  --ok: #3ddc84;
  --radius: 14px;
}

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

/* 关键:让 hidden 属性始终生效,不被 display:flex 覆盖 */
[hidden] { display: none !important; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}

/* 顶栏 */
.topbar {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 14px 28px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(15, 17, 23, 0.9);
  backdrop-filter: blur(8px);
  z-index: 10;
}
.brand { font-size: 18px; font-weight: 700; }
nav { display: flex; gap: 18px; flex: 1; }
.nav-item {
  color: var(--muted);
  cursor: pointer;
  font-size: 14px;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  transition: .2s;
}
.nav-item:hover { color: var(--text); }
.nav-item.active { color: var(--text); border-bottom-color: var(--accent); }

.btn-upgrade {
  background: linear-gradient(135deg, var(--gold), #e08b2d);
  color: #1a1206;
  border: none;
  padding: 8px 16px;
  border-radius: 20px;
  font-weight: 600;
  cursor: pointer;
  font-size: 13px;
}
.btn-upgrade:hover { filter: brightness(1.05); }

main { max-width: 920px; margin: 0 auto; padding: 40px 20px 80px; }

.hero { text-align: center; margin-bottom: 28px; }
.hero h1 { font-size: 30px; margin-bottom: 8px; }
.sub { color: var(--muted); font-size: 15px; }
.sub strong { color: var(--ok); }

/* 上传区 */
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: .2s;
  background: var(--panel);
}
.drop-zone.dragover { border-color: var(--accent); background: var(--panel-2); }
.drop-icon { font-size: 42px; margin-bottom: 10px; }
.drop-inner .link { color: var(--accent); font-weight: 600; }
.hint { color: var(--muted); font-size: 13px; margin-top: 6px; }

/* 控制面板 */
.controls {
  margin-top: 24px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  align-items: flex-end;
}
.control-group { display: flex; flex-direction: column; gap: 8px; }
.control-group label { font-size: 13px; color: var(--muted); }
.val { color: var(--accent); font-weight: 600; font-size: 13px; }

input[type="range"] { width: 180px; accent-color: var(--accent); }
select, input[type="text"] {
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 14px;
}
input[type="text"] { width: 180px; }
.wm-pos { display: flex; align-items: center; gap: 8px; }

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  border: none;
  padding: 10px 24px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
}
.btn-primary:hover { filter: brightness(1.08); }
.btn-ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 10px 18px;
  border-radius: 10px;
  cursor: pointer;
}
.btn-ghost:hover { color: var(--text); border-color: var(--muted); }

/* 结果 */
.results { margin-top: 32px; }
.results h2 { font-size: 20px; margin-bottom: 16px; }
.count { color: var(--muted); font-size: 14px; font-weight: 400; }
.result-list { display: flex; flex-direction: column; gap: 12px; }

.result-item {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 18px;
}
.result-item img {
  width: 64px; height: 64px;
  object-fit: cover;
  border-radius: 8px;
  background: var(--panel-2);
}
.result-info { flex: 1; min-width: 0; }
.result-name { font-size: 14px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.result-size { font-size: 13px; color: var(--muted); margin-top: 2px; }
.result-size .saved { color: var(--ok); font-weight: 600; }
.btn-download {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 8px 18px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
}
.btn-download:hover { filter: brightness(1.1); }

/* 弹窗 */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 20px;
}
.modal-box {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 32px;
  max-width: 560px;
  width: 100%;
  position: relative;
  max-height: 90vh;
  overflow-y: auto;
}
.modal-close {
  position: absolute;
  top: 12px; right: 16px;
  background: none; border: none;
  color: var(--muted);
  font-size: 26px;
  cursor: pointer;
}
.modal-box h2 { font-size: 22px; }
.modal-sub { color: var(--muted); margin: 6px 0 20px; }
.modal-sub strong { color: var(--gold); }

.plans { display: flex; gap: 14px; margin-bottom: 24px; }
.plan {
  flex: 1;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  text-align: center;
}
.plan.hot { border-color: var(--gold); box-shadow: 0 0 0 1px var(--gold); }
.plan-name { font-size: 14px; color: var(--muted); }
.plan-price { font-size: 28px; font-weight: 700; margin: 8px 0; }
.plan-price span { font-size: 13px; color: var(--muted); font-weight: 400; }
.plan ul { list-style: none; text-align: left; font-size: 13px; color: var(--muted); margin-bottom: 16px; }
.plan li { padding: 4px 0; }
.plan li::before { content: "✓ "; color: var(--ok); }
.btn-plan {
  width: 100%;
  padding: 9px;
  border-radius: 8px;
  border: 1px solid var(--accent);
  background: transparent;
  color: var(--accent);
  cursor: pointer;
  font-weight: 600;
}
.plan.hot .btn-plan { background: linear-gradient(135deg, var(--gold), #e08b2d); border: none; color: #1a1206; }

.pay-info { border-top: 1px solid var(--border); padding-top: 18px; font-size: 13px; color: var(--muted); }
.pay-info input {
  width: 100%;
  margin: 10px 0;
  text-align: center;
  letter-spacing: 1px;
}
.pay-info .btn-primary { width: 100%; }
.activate-msg { margin-top: 10px; min-height: 20px; font-size: 13px; }
.activate-msg.ok { color: var(--ok); }
.activate-msg.err { color: var(--danger); }

footer {
  text-align: center;
  color: var(--muted);
  font-size: 12px;
  padding: 24px;
  border-top: 1px solid var(--border);
}

@media (max-width: 600px) {
  .topbar { padding: 12px 16px; gap: 12px; }
  .plans { flex-direction: column; }
  .controls { flex-direction: column; align-items: stretch; }
  input[type="range"], input[type="text"] { width: 100%; }
}