:root {
  --ink: #0c2a35;
  --ink-soft: #1a4554;
  --paper: #f2ebe3;
  --mist: #d5e0e6;
  --sky: #9eb8c4;
  --stamp: #e85d4c;
  --stamp-deep: #c44536;
  --ok: #2f6f5e;
  --warn: #8a5a1a;
  --radius: 14px;
  --font-display: "Fraunces", "Noto Serif TC", serif;
  --font-body: "Source Sans 3", "Noto Sans TC", sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: var(--font-body);
  color: var(--ink);
  background:
    radial-gradient(1200px 700px at 12% -10%, rgba(232, 93, 76, 0.18), transparent 55%),
    radial-gradient(900px 600px at 90% 10%, rgba(158, 184, 196, 0.55), transparent 50%),
    linear-gradient(165deg, #e8eef2 0%, var(--paper) 48%, #e4ece8 100%);
  background-attachment: fixed;
  line-height: 1.55;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.35;
  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='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='0.45'/%3E%3C/svg%3E");
  mix-blend-mode: multiply;
}

a {
  color: var(--ink-soft);
}

.app {
  position: relative;
  z-index: 1;
  width: min(560px, calc(100% - 2rem));
  margin: 0 auto;
  padding: clamp(2.5rem, 8vh, 4.5rem) 0 3rem;
}

.brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2.75rem, 9vw, 4rem);
  letter-spacing: 0.04em;
  line-height: 1.05;
  margin: 0 0 0.65rem;
  animation: rise 0.9s var(--ease) both;
}

.tagline {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.15rem, 3.4vw, 1.45rem);
  margin: 0 0 0.55rem;
  color: var(--ink-soft);
  animation: rise 0.9s var(--ease) 0.08s both;
}

.lede {
  margin: 0 0 1.75rem;
  color: #3d5560;
  max-width: 28rem;
  animation: rise 0.9s var(--ease) 0.14s both;
}

.panel {
  animation: rise 0.9s var(--ease) 0.2s both;
}

.hidden {
  display: none !important;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  align-items: center;
}

.btn {
  appearance: none;
  border: 0;
  font: inherit;
  cursor: pointer;
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--paper);
  transition: transform 0.25s var(--ease), background 0.2s ease;
}

.btn:hover {
  background: var(--ink-soft);
}

.btn:active {
  transform: scale(0.98);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.btn-ghost {
  background: transparent;
  color: var(--ink-soft);
  border: 1px solid rgba(12, 42, 53, 0.22);
}

.btn-stamp {
  background: var(--stamp);
  color: #fff;
}

.btn-stamp:hover {
  background: var(--stamp-deep);
}

.gsi-wrap {
  min-height: 44px;
}

.setup-box {
  margin-top: 1.25rem;
  padding: 1rem 1.1rem;
  border-left: 3px solid var(--stamp);
  background: rgba(255, 255, 255, 0.45);
  font-size: 0.95rem;
}

.setup-box code {
  font-size: 0.85em;
  word-break: break-all;
}

.session {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: baseline;
  margin-bottom: 1.25rem;
  font-size: 0.95rem;
}

.session strong {
  font-weight: 600;
}

.meter {
  height: 4px;
  background: rgba(12, 42, 53, 0.12);
  border-radius: 2px;
  overflow: hidden;
  margin: 0.75rem 0 1.25rem;
}

.meter > span {
  display: block;
  height: 100%;
  width: 0%;
  background: var(--stamp);
  transition: width 0.1s linear;
}

.record-stage {
  display: grid;
  place-items: center;
  padding: 1.5rem 0 1rem;
}

.record-btn {
  width: min(220px, 70vw);
  height: min(220px, 70vw);
  border-radius: 50%;
  border: 0;
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 1.2rem;
  letter-spacing: 0.06em;
  color: var(--paper);
  background:
    radial-gradient(circle at 35% 30%, rgba(255, 255, 255, 0.2), transparent 45%),
    linear-gradient(160deg, var(--ink-soft), var(--ink));
  box-shadow: 0 18px 40px rgba(12, 42, 53, 0.22);
  user-select: none;
  touch-action: none;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
  animation: breathe 3.6s ease-in-out infinite;
}

.record-btn:hover {
  transform: translateY(-2px);
}

.record-btn.is-recording {
  background:
    radial-gradient(circle at 35% 30%, rgba(255, 255, 255, 0.25), transparent 45%),
    linear-gradient(160deg, var(--stamp), var(--stamp-deep));
  animation: pulse 1.1s ease-in-out infinite;
  box-shadow: 0 0 0 0 rgba(232, 93, 76, 0.45);
}

.hint {
  text-align: center;
  color: #4a6570;
  font-size: 0.92rem;
  margin: 0.35rem 0 1.25rem;
}

label.field {
  display: block;
  font-size: 0.85rem;
  color: #4a6570;
  margin-bottom: 0.35rem;
}

input[type="text"],
textarea {
  width: 100%;
  font: inherit;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid rgba(12, 42, 53, 0.16);
  border-radius: var(--radius);
  padding: 0.75rem 0.9rem;
  margin-bottom: 0.9rem;
}

textarea {
  min-height: 8.5rem;
  resize: vertical;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.status {
  min-height: 1.4em;
  margin-top: 0.9rem;
  font-size: 0.95rem;
}

.status.ok {
  color: var(--ok);
}

.status.err {
  color: var(--stamp-deep);
}

.footer-note {
  margin-top: 2.5rem;
  font-size: 0.82rem;
  color: #607882;
  animation: rise 0.9s var(--ease) 0.28s both;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes breathe {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.02);
  }
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(232, 93, 76, 0.45);
  }
  70% {
    box-shadow: 0 0 0 22px rgba(232, 93, 76, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(232, 93, 76, 0);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}