:root {
  --bg-top: #f1e7d8;
  --bg-bottom: #faf8f2;
  --panel: rgba(255, 252, 246, 0.86);
  --panel-border: rgba(64, 42, 21, 0.12);
  --ink: #24170d;
  --muted: #6f5a48;
  --accent: #b14d2f;
  --accent-deep: #7d3119;
  --shadow: 0 22px 48px rgba(76, 45, 19, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "IBM Plex Sans TC", "Microsoft JhengHei", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(196, 127, 76, 0.18), transparent 28%),
    linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
  min-height: 100vh;
}

textarea,
input,
button {
  font: inherit;
}

.shell {
  width: min(1120px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 48px 0 72px;
}

.hero {
  margin-bottom: 24px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent-deep);
  font-family: "Space Grotesk", sans-serif;
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero h1,
.result-head h2,
.usage-card h2 {
  font-family: "Space Grotesk", sans-serif;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.6rem);
  line-height: 0.94;
}

.lede {
  max-width: 760px;
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.7;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 28px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.panel + .panel {
  margin-top: 18px;
}

.auth-panel {
  padding: 24px 28px;
}

.auth-panel h2 {
  margin: 0 0 8px;
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.3rem;
}

.auth-panel p {
  margin: 0 0 14px;
  color: var(--muted);
}

.user-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.user-row > div {
  flex: 1 1 auto;
}

.user-email {
  margin: 0;
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.1rem;
  color: var(--ink);
}

.user-tier,
.user-subscription {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 0.94rem;
}

.user-tier span {
  font-weight: 600;
  color: var(--accent-deep);
}

#sign-out-button {
  background: transparent;
  color: var(--accent-deep);
  border: 1px solid rgba(177, 77, 47, 0.35);
  box-shadow: none;
  padding: 10px 18px;
}

#sign-out-button:hover {
  background: rgba(177, 77, 47, 0.08);
}

.upgrade-row {
  display: flex;
  gap: 12px;
  margin-top: 16px;
  flex-wrap: wrap;
}

.upgrade-row button {
  flex: 1 1 220px;
}

.form {
  display: grid;
  gap: 18px;
  padding: 28px;
}

.field-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin: 0;
  padding: 16px 18px;
  border: 1px solid var(--panel-border);
  border-radius: 18px;
}

.field-group legend {
  padding: 0 8px;
  color: var(--muted);
}

.field {
  display: grid;
  gap: 8px;
}

.field span {
  font-weight: 600;
}

input[type="text"],
textarea {
  width: 100%;
  border: 1px solid rgba(90, 65, 40, 0.16);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.72);
  padding: 14px 16px;
  color: var(--ink);
  transition: border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

input[type="text"]:focus,
textarea:focus {
  outline: none;
  border-color: rgba(177, 77, 47, 0.48);
  box-shadow: 0 0 0 4px rgba(177, 77, 47, 0.12);
  transform: translateY(-1px);
}

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

button {
  border: 0;
  border-radius: 999px;
  padding: 12px 20px;
  background: linear-gradient(135deg, var(--accent), var(--accent-deep));
  color: #fff7f2;
  cursor: pointer;
  transition: transform 140ms ease, box-shadow 140ms ease, opacity 140ms ease;
  box-shadow: 0 14px 26px rgba(125, 49, 25, 0.24);
}

button:hover {
  transform: translateY(-1px);
}

button:disabled {
  opacity: 0.6;
  cursor: progress;
}

.status {
  margin: 0;
  color: var(--muted);
  min-height: 1.5em;
}

.results {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 24px;
  padding: 28px;
}

.result-card,
.usage-card {
  display: grid;
  gap: 14px;
  padding: 20px;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.74);
  border: 1px solid rgba(90, 65, 40, 0.12);
}

.usage-card {
  grid-column: 1 / -1;
}

.result-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.result-head h2,
.usage-card h2 {
  margin: 0;
  font-size: 1.15rem;
}

.result-card textarea {
  min-height: 360px;
  resize: vertical;
}

.usage-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
}

.usage-list div {
  padding: 12px 14px;
  border-radius: 16px;
  background: rgba(255, 249, 242, 0.92);
}

.usage-list dt {
  color: var(--muted);
  font-size: 0.88rem;
}

.usage-list dd {
  margin: 8px 0 0;
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.08rem;
}

@media (max-width: 840px) {
  .shell {
    width: min(100vw - 20px, 1120px);
    padding-top: 24px;
    padding-bottom: 36px;
  }

  .form,
  .results {
    padding: 18px;
  }

  .results {
    grid-template-columns: 1fr;
  }

  .usage-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .usage-list {
    grid-template-columns: 1fr;
  }

  .field-group {
    flex-direction: column;
    align-items: flex-start;
  }
}