:root{
  --bg: radial-gradient(1200px 700px at 15% 10%, rgba(14,165,233,.18), transparent 55%),
        radial-gradient(1000px 650px at 85% 20%, rgba(99,102,241,.16), transparent 55%),
        radial-gradient(900px 700px at 45% 95%, rgba(34,197,94,.10), transparent 55%),
        #f6f8fc;

  --text: #0b1220;
  --sub: rgba(11,18,32,.68);
  --muted: rgba(11,18,32,.48);

  --glass: rgba(255,255,255,.66);
  --glass2: rgba(255,255,255,.52);
  --border: rgba(15,23,42,.12);

  --shadow: 0 34px 90px rgba(15,23,42,.12);
  --shadow2: 0 18px 45px rgba(15,23,42,.10);

  --accent: #0ea5e9;
  --accent2: rgba(14,165,233,.72);

  --radius: 30px;
  --radius2: 18px;
}

html.theme-dark{
  --bg: radial-gradient(1200px 700px at 15% 10%, rgba(56,189,248,.18), transparent 55%),
        radial-gradient(1000px 650px at 85% 20%, rgba(167,139,250,.14), transparent 55%),
        radial-gradient(900px 700px at 45% 95%, rgba(34,197,94,.09), transparent 55%),
        #020617;

  --text: #f8fafc;
  --sub: rgba(248,250,252,.72);
  --muted: rgba(248,250,252,.50);

  --glass: rgba(2,6,23,.66);
  --glass2: rgba(2,6,23,.52);
  --border: rgba(148,163,184,.22);

  --shadow: 0 38px 120px rgba(0,0,0,.72);
  --shadow2: 0 18px 55px rgba(0,0,0,.55);

  --accent: #38bdf8;
  --accent2: rgba(56,189,248,.72);
}

*{ box-sizing: border-box; }
html, body{ height: 100%; }
body{
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, system-ui, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  overflow-x: hidden;
}

/* 背景：更糊、更有层次 */
.bg-aurora{
  position: fixed;
  inset: -20%;
  background:
    radial-gradient(closest-side at 25% 30%, rgba(14,165,233,.22), transparent 60%),
    radial-gradient(closest-side at 70% 35%, rgba(99,102,241,.18), transparent 65%),
    radial-gradient(closest-side at 50% 75%, rgba(34,197,94,.12), transparent 65%);
  filter: blur(70px) saturate(120%);
  opacity: .9;
  pointer-events: none;
  z-index: 0;
}
html.theme-dark .bg-aurora{
  opacity: .75;
  filter: blur(85px) saturate(130%);
}

.bg-noise{
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='.18'/%3E%3C/svg%3E");
  opacity: .16;
  mix-blend-mode: overlay;
  pointer-events: none;
  z-index: 0;
}

/* 右上角按钮 */
.theme-toggle{
  position: fixed;
  top: 18px;
  right: 18px;
  z-index: 20;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.62);
  color: var(--text);
  border-radius: 999px;
  padding: 9px 12px;
  cursor: pointer;
  box-shadow: 0 10px 26px rgba(15,23,42,.12);
  backdrop-filter: blur(16px);
}
html.theme-dark .theme-toggle{
  background: rgba(2,6,23,.55);
  box-shadow: 0 10px 30px rgba(0,0,0,.55);
}

/* 主舞台：中央凸显 */
.stage{
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 28px 18px;
}

/* 毛玻璃卡片 */
.glass{
  background: linear-gradient(180deg, var(--glass), var(--glass2));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(22px);
}

/* 主卡片 */
.hero{
  width: min(880px, 100%);
  padding: 34px 34px 26px;
  position: relative;
  overflow: hidden;
}
@media (max-width: 560px){
  .hero{ padding: 24px 18px 20px; border-radius: 24px; }
}

.hero::before{
  content:"";
  position:absolute;
  inset: -2px;
  background:
    radial-gradient(900px 240px at 30% 0%, rgba(56,189,248,.20), transparent 60%),
    radial-gradient(700px 280px at 90% 10%, rgba(99,102,241,.16), transparent 65%);
  filter: blur(20px);
  opacity: .9;
  pointer-events:none;
}

.hero-badge{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border-radius: 999px;
  font-size: 12px;
  color: var(--sub);
  border: 1px solid var(--border);
  background: rgba(255,255,255,.55);
  position: relative;
  z-index: 1;
}
html.theme-dark .hero-badge{
  background: rgba(2,6,23,.55);
}

.hero-title{
  position: relative;
  z-index: 1;
  margin: 14px 0 6px;
  font-size: 30px;
  font-weight: 800;
  letter-spacing: .02em;
}
.hero-desc{
  position: relative;
  z-index: 1;
  margin: 0 0 18px;
  color: var(--sub);
  line-height: 1.75;
  font-size: 14px;
}

.picker{
  position: relative;
  z-index: 1;
  margin-top: 14px;
  border-radius: var(--radius2);
  border: 1px solid var(--border);
  background: rgba(255,255,255,.50);
  padding: 16px;
  box-shadow: var(--shadow2);
}
html.theme-dark .picker{
  background: rgba(2,6,23,.48);
}

.picker-label{
  display: block;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 8px;
}

.picker-row{
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}

.select-wrap{
  position: relative;
  flex: 1;
  min-width: 240px;
}
select{
  width: 100%;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;

  padding: 12px 42px 12px 14px;
  border-radius: 999px;
  border: 1px solid rgba(15,23,42,.14);
  background: rgba(255,255,255,.75);
  color: var(--text);
  outline: none;
  font-size: 14px;
  transition: transform .12s ease-out, border-color .12s ease-out, box-shadow .12s ease-out, background .12s ease-out;
}
html.theme-dark select{
  border-color: rgba(148,163,184,.22);
  background: rgba(2,6,23,.62);
}
select:focus{
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(56,189,248,.18);
  transform: translateY(-1px);
}
select:disabled{
  opacity: .6;
  cursor: not-allowed;
}

.select-icon{
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-52%);
  color: var(--muted);
  font-size: 14px;
  pointer-events: none;
}

.btn-primary{
  border: none;
  cursor: pointer;
  border-radius: 999px;
  padding: 12px 16px;
  font-weight: 800;
  font-size: 14px;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  box-shadow: 0 18px 40px rgba(14,165,233,.22);
  transition: transform .12s ease-out, filter .12s ease-out, box-shadow .12s ease-out;
  white-space: nowrap;
}
html.theme-dark .btn-primary{
  box-shadow: 0 18px 40px rgba(56,189,248,.18);
}
.btn-primary:hover{ transform: translateY(-1px); filter: brightness(1.03); }
.btn-primary:active{ transform: translateY(0); filter: brightness(.98); }
.btn-primary:disabled{
  opacity: .58;
  cursor: not-allowed;
  box-shadow: none;
}

.picker-hint{
  margin-top: 10px;
  font-size: 12px;
  color: var(--muted);
  line-height: 1.6;
}

.footnote{
  margin-top: 14px;
  font-size: 12px;
  color: var(--muted);
  line-height: 1.7;
  position: relative;
  z-index: 1;
}

/* 锁屏层：更强的模糊和聚焦 */
.lock{
  position: fixed;
  inset: 0;
  z-index: 10;
  display: none;
  place-items: center;
  padding: 24px 18px;
  background: rgba(15,23,42,.20);
  backdrop-filter: blur(18px);
}
html.theme-dark .lock{
  background: rgba(0,0,0,.60);
  backdrop-filter: blur(22px);
}
.lock.show{ display: grid; }

.modal{
  width: min(860px, 100%);
  padding: 32px;
  border-radius: 34px;
  position: relative;
  overflow: hidden;
}
@media (max-width: 560px){
  .modal{ padding: 22px; border-radius: 26px; }
}

.modal::before{
  content:"";
  position:absolute;
  inset:-2px;
  background:
    radial-gradient(900px 240px at 20% 0%, rgba(56,189,248,.22), transparent 60%),
    radial-gradient(720px 260px at 90% 5%, rgba(167,139,250,.16), transparent 65%);
  filter: blur(20px);
  opacity: .9;
  pointer-events:none;
}

.modal-top{ position: relative; z-index: 1; }
.modal-badge{
  display: inline-flex;
  padding: 7px 12px;
  border-radius: 999px;
  font-size: 12px;
  color: var(--sub);
  border: 1px solid var(--border);
  background: rgba(255,255,255,.55);
}
html.theme-dark .modal-badge{ background: rgba(2,6,23,.55); }

.modal-title{
  position: relative;
  z-index: 1;
  margin: 12px 0 6px;
  font-size: 26px;
  font-weight: 850;
  letter-spacing: .02em;
}
.modal-desc{
  position: relative;
  z-index: 1;
  margin: 0 0 14px;
  color: var(--sub);
  line-height: 1.75;
  font-size: 14px;
}

.modal-bottom{
  position: relative;
  z-index: 1;
  margin-top: 12px;
  font-size: 12px;
  color: var(--muted);
}
.modal-bottom code{
  padding: 2px 6px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.55);
}
html.theme-dark .modal-bottom code{
  background: rgba(2,6,23,.55);
}

/* Toast */
.toast{
  position: fixed;
  left: 50%;
  bottom: 22px;
  transform: translateX(-50%);
  padding: 9px 14px;
  border-radius: 999px;
  background: rgba(15,23,42,.92);
  color: #e5e7eb;
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .16s ease-out;
  z-index: 30;
}
.toast.show{ opacity: 1; }