:root {
  --bg: #f7fbff;
  --bg-grad-1: #f7fbff;
  --bg-grad-2: #eaf2ff;
  --text: #0f172a;
  --muted: #475569;
  --primary: #2563eb;
  --primary-press: #1d4ed8;
  --border: #e5e7eb;
  --surface: #ffffff;
  --surface-elev: #ffffff;
  --radius: 16px;
  --space-1: 8px;
  --space-2: 12px;
  --space-3: 16px;
  --space-4: 24px;
  --fs-1: 14px;
  --fs-2: 16px;
  --fs-3: 24px;
  --container: 760px;
  --shadow-1: 0 8px 28px rgba(27, 66, 142, .12);
  --shadow-2: 0 16px 34px rgba(27, 66, 142, .18);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body { font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif; margin: 0; background: radial-gradient(1200px circle at 0% 0%, var(--bg-grad-2), var(--bg-grad-1)); color: var(--text); }
.container { max-width: var(--container); margin: 0 auto; padding: var(--space-4) var(--space-3); min-height: 100dvh; display: grid; align-content: center; gap: var(--space-4); }
.header { text-align: center; display: flex; align-items: center; justify-content: center; gap: 12px; }
.brand-logo { width: 40px; height: 40px; filter: drop-shadow(0 6px 14px rgba(37,99,235,.25)); }
.title { font-size: calc(var(--fs-3) + 8px); margin: 0; letter-spacing: .4px; font-weight: 800; background: linear-gradient(90deg, #60a5fa, #2563eb, #1e3a8a); -webkit-background-clip: text; background-clip: text; color: transparent; animation: title-shift 6s ease-in-out infinite alternate; text-shadow: 0 2px 0 rgba(255,255,255,.4); }
@keyframes title-shift { 0% { background-position: 0% 50%; } 100% { background-position: 100% 50%; } }
.view { background: var(--surface); padding: var(--space-4); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow-2); }
.field-row { display: grid; grid-template-columns: 1fr auto auto; gap: var(--space-2); align-items: center; }
.input { padding: var(--space-2); font-size: var(--fs-2); border: 1px solid var(--border); border-radius: var(--radius); width: 100%; color: var(--text); background: var(--surface-elev); }
.key-row { margin-bottom: var(--space-3); }
.key-badge { display: inline-block; padding: 6px 12px; border-radius: 999px; background: #e0ecff; color: #1e3a8a; font-size: var(--fs-1); border: 1px solid #cfe1ff; }
.actions { display: grid; grid-template-columns: 1fr; gap: var(--space-2); }
.btn { appearance: none; border: 1px solid #cfe1ff; background: #ffffff; color: #0b1b2b; border-radius: var(--radius); padding: 14px var(--space-3); font-size: var(--fs-2); min-height: 48px; cursor: pointer; transition: transform .08s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease; box-shadow: var(--shadow-1); display: inline-flex; align-items: center; gap: 10px; justify-content: center; }
.btn:hover { background: #f0f6ff; box-shadow: var(--shadow-2); border-color: #bcd6ff; }
.btn:focus-visible { outline: 3px solid #93c5fd; outline-offset: 2px; }
.btn:active { transform: translateY(1px); }
.btn[disabled] { opacity: .6; cursor: not-allowed; }
.btn-primary { background: linear-gradient(135deg, #60a5fa, #2563eb); color: #fff; border-color: #2563eb; }
.btn-primary:hover { background: linear-gradient(135deg, #3b82f6, #1d4ed8); }
.msg { margin-top: var(--space-2); font-size: var(--fs-1); color: var(--muted); min-height: 1em; }
.icon { width: 20px; height: 20px; display: inline-block; }

@media (min-width: 640px) {
  .actions { grid-template-columns: 1fr 1fr; }
}

/* Blue-first palette; keep single scheme for brand consistency */
 .history { margin-top: var(--space-3); display: grid; gap: var(--space-2); }
 .history-header { font-size: var(--fs-2); color: var(--text); font-weight: 600; }
 .history-list { display: grid; gap: var(--space-2); }
 .history-item { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: var(--space-2); padding: var(--space-2); border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface-elev); }
 .history-text { font-size: var(--fs-1); color: var(--muted); overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
 .history-copy-btn { padding: 8px 12px; min-height: 36px; }