/* Xのダークテーマをイメージした配色 */
:root {
  --xaa-bg-top: #1C2732;
  --xaa-bg-bottom: #0F1419;
  --xaa-accent: #1D9BF0;
  --xaa-accent-dark: #1478BC;
  --xaa-card: #FFFFFF;
  --xaa-text: #21262B;
  --xaa-dim: #78838D;
  --xaa-danger: #E0533D;
  --xaa-ok: #00A892;
  --xaa-border: #E3E8ED;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: 'Nunito', 'Hiragino Maru Gothic ProN', 'Hiragino Sans', sans-serif;
  color: var(--xaa-text);
  background: linear-gradient(160deg, var(--xaa-bg-top) 0%, var(--xaa-bg-bottom) 60%);
  background-attachment: fixed;
  padding-bottom: 40px;
}

.xaa-header {
  text-align: center;
  padding: calc(36px + env(safe-area-inset-top)) 16px 24px;
  color: #fff;
}

.xaa-logo {
  width: 64px;
  height: 64px;
  margin: 0 auto 10px;
  filter: drop-shadow(0 4px 8px rgba(0,0,0,.3));
}
.xaa-logo svg { width: 100%; height: 100%; }

.xaa-header h1 {
  margin: 0;
  font-size: 26px;
  font-weight: 800;
  letter-spacing: .02em;
  text-shadow: 0 2px 6px rgba(0,0,0,.25);
}

.xaa-sub {
  margin: 6px 0 0;
  font-size: 13px;
  opacity: .85;
}

.xaa-main {
  max-width: 520px;
  margin: 0 auto;
  padding: 0 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.xaa-card {
  background: var(--xaa-card);
  border-radius: 18px;
  padding: 18px 18px 20px;
  box-shadow: 0 10px 30px rgba(0, 20, 40, .28);
}

.xaa-card-title {
  margin: 0 0 14px;
  font-size: 16px;
  font-weight: 800;
  color: var(--xaa-accent-dark);
  display: flex;
  align-items: center;
  gap: 8px;
}
.xaa-card-title::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--xaa-accent);
  display: inline-block;
}

.xaa-form-group { margin-bottom: 12px; }
.xaa-form-group label {
  display: block;
  font-size: 12.5px;
  font-weight: 700;
  color: var(--xaa-dim);
  margin-bottom: 5px;
}

.xaa-input {
  width: 100%;
  font-size: 16px; /* iOSズーム防止 */
  padding: 10px 12px;
  border: 1.5px solid var(--xaa-border);
  border-radius: 10px;
  background: #F7FAFC;
  color: var(--xaa-text);
  font-family: inherit;
  min-height: 42px;
}
.xaa-input:focus {
  outline: none;
  border-color: var(--xaa-accent);
}

.xaa-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 11px 16px;
  border: none;
  border-radius: 12px;
  font-size: 14.5px;
  font-weight: 800;
  font-family: inherit;
  cursor: pointer;
  background: #EDF1F5;
  color: var(--xaa-text);
  transition: transform .08s ease, opacity .15s ease;
}
.xaa-btn:active { transform: scale(.97); }
.xaa-btn:disabled { opacity: .5; cursor: default; }
.xaa-btn.primary { background: linear-gradient(135deg, var(--xaa-accent), var(--xaa-accent-dark)); color: #fff; }
.xaa-btn.sm { padding: 7px 12px; font-size: 13px; border-radius: 9px; }

.xaa-status {
  font-size: 13px;
  font-weight: 700;
  margin: 6px 0;
  min-height: 1px;
  overflow-wrap: break-word;
}
.xaa-status.ok { color: var(--xaa-ok); }
.xaa-status.error { color: var(--xaa-danger); }

.xaa-empty {
  font-size: 13px;
  color: var(--xaa-dim);
  text-align: center;
  padding: 14px 0;
}

.xaa-note {
  font-size: 12px;
  color: var(--xaa-dim);
  line-height: 1.6;
  margin: 10px 0 14px;
}

@media (max-width: 480px) {
  .xaa-header h1 { font-size: 22px; }
  .xaa-card { padding: 16px 14px 18px; border-radius: 16px; }
}