:root {
  color-scheme: light;
  --color-primary: #c43b5b;
  --color-primary-hover: #aa2f4d;
  --color-primary-soft: #fde8ed;
  --color-accent: #315e52;
  --color-accent-soft: #e3efeb;
  --color-background: #fff7f5;
  --color-surface: #ffffff;
  --color-surface-alt: #f7efed;
  --color-foreground: #2d2225;
  --color-muted: #71656a;
  --color-border: #e7d9d9;
  --color-error: #a52a37;
  --color-error-soft: #fff0f1;
  --color-success: #246a52;
  --color-ring: #8f2743;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --content-width: 720px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

html { min-width: 320px; background: var(--color-background); scroll-behavior: smooth; }

body {
  min-height: 100dvh;
  margin: 0;
  color: var(--color-foreground);
  background:
    radial-gradient(circle at 88% 2%, rgba(196, 59, 91, 0.11), transparent 26rem),
    var(--color-background);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

button, input, textarea { font: inherit; }

button { touch-action: manipulation; }

button, a { -webkit-tap-highlight-color: transparent; }

button:focus-visible,
input:focus-visible,
textarea:focus-visible,
a:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--color-ring) 55%, transparent);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  left: var(--space-4);
  top: var(--space-4);
  padding: var(--space-3) var(--space-4);
  color: #fff;
  background: var(--color-foreground);
  border-radius: var(--radius-sm);
  transform: translateY(-160%);
  transition: transform 180ms ease-out;
}

.skip-link:focus { transform: translateY(0); }

.app-shell {
  width: min(100%, 1080px);
  min-height: 100dvh;
  margin: 0 auto;
  padding: max(var(--space-4), env(safe-area-inset-top)) max(var(--space-4), env(safe-area-inset-right)) max(var(--space-6), env(safe-area-inset-bottom)) max(var(--space-4), env(safe-area-inset-left));
  display: flex;
  flex-direction: column;
}

.app-header {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.brand {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  color: #fff;
  background: var(--color-primary);
  border-radius: 13px;
}

.brand-mark svg { width: 25px; height: 25px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

.brand strong, .brand small { display: block; }
.brand strong { font-size: 15px; line-height: 1.25; letter-spacing: .01em; }
.brand small { margin-top: 2px; color: var(--color-muted); font-size: 11px; }

.text-button {
  min-height: 44px;
  padding: 0 var(--space-2);
  border: 0;
  color: var(--color-muted);
  background: transparent;
  cursor: pointer;
  font-size: 13px;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.text-button:hover { color: var(--color-foreground); }

.runtime-banner {
  width: fit-content;
  max-width: 100%;
  margin: var(--space-4) auto 0;
  padding: 6px 11px;
  color: var(--color-muted);
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-size: 12px;
  text-align: center;
}

.runtime-banner.is-demo { color: #7d5112; background: #fff3d7; border-color: #e7c578; }
.runtime-banner.is-model { color: var(--color-success); background: var(--color-accent-soft); border-color: color-mix(in srgb, var(--color-success) 30%, transparent); }
.runtime-banner.is-unconfigured { color: var(--color-error); background: var(--color-error-soft); border-color: color-mix(in srgb, var(--color-error) 25%, transparent); }

main { flex: 1; width: 100%; }
main:focus { outline: none; }
.keep-together { display: inline-block; white-space: nowrap; }

.intro,
.wizard,
.loading-panel,
.result-panel {
  width: min(100%, var(--content-width));
  margin: 0 auto;
}

.intro {
  min-height: calc(100dvh - 180px);
  padding: clamp(64px, 11vh, 112px) 0 48px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
}

.kicker {
  margin: 0 0 var(--space-3);
  color: var(--color-primary-hover);
  font-size: 13px;
  font-weight: 750;
  letter-spacing: .12em;
}

h1, h2, p { overflow-wrap: anywhere; }

h1 {
  margin: 0;
  font-size: clamp(34px, 8vw, 62px);
  line-height: 1.14;
  letter-spacing: -.045em;
}

.intro-copy {
  max-width: 560px;
  margin: var(--space-6) 0 0;
  color: var(--color-muted);
  font-size: clamp(16px, 2.2vw, 19px);
}

.promise-row {
  margin: var(--space-8) 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.promise-row span {
  padding: 7px 12px;
  color: var(--color-accent);
  background: var(--color-accent-soft);
  border: 1px solid color-mix(in srgb, var(--color-accent) 20%, transparent);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 650;
}

.primary-button,
.secondary-button {
  min-height: 48px;
  padding: 0 var(--space-5);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  cursor: pointer;
  font-weight: 750;
  transition: background-color 180ms ease-out, border-color 180ms ease-out, color 180ms ease-out, opacity 180ms ease-out, transform 100ms ease-out;
}

.primary-button { color: #fff; background: var(--color-primary); }
.primary-button:hover { background: var(--color-primary-hover); }
.primary-button:active, .secondary-button:active, .choice-card:active, .choice-pill:active, .copy-button:active { transform: scale(.97); }
.primary-button.large { min-height: 56px; padding-inline: var(--space-6); }
.primary-button svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

.secondary-button {
  color: var(--color-foreground);
  background: var(--color-surface);
  border-color: var(--color-border);
}

.secondary-button:hover { border-color: var(--color-primary); color: var(--color-primary-hover); }
.primary-button:disabled, .secondary-button:disabled { opacity: .45; cursor: not-allowed; transform: none; }

.wizard { padding: var(--space-10) 0 56px; }

.progress-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-4);
}

.step-count { color: var(--color-primary-hover); font-size: 13px; font-weight: 750; }
.progress-header h1 { margin-top: var(--space-2); font-size: clamp(28px, 5vw, 40px); }
.draft-status { flex: none; color: var(--color-muted); font-size: 12px; }

.progress-track {
  height: 5px;
  margin: var(--space-6) 0 var(--space-8);
  overflow: hidden;
  background: var(--color-border);
  border-radius: 999px;
}

.progress-track span { display: block; width: 20%; height: 100%; background: var(--color-primary); border-radius: inherit; transition: width 260ms ease-out; }

.step-panel {
  min-height: 390px;
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

fieldset { min-width: 0; margin: 0; padding: 0; border: 0; }
fieldset + fieldset, fieldset + .field, .field + fieldset { margin-top: var(--space-8); }
legend, label { display: block; color: var(--color-foreground); font-size: 16px; font-weight: 750; }
label span { color: var(--color-muted); font-size: 12px; font-weight: 500; }
.field-help { margin: var(--space-1) 0 var(--space-4); color: var(--color-muted); font-size: 13px; }

.choice-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-3); margin-top: var(--space-4); }
.choice-grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.choice-card,
.choice-pill {
  min-height: 52px;
  color: var(--color-foreground);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  cursor: pointer;
  font-weight: 650;
  transition: background-color 180ms ease-out, border-color 180ms ease-out, color 180ms ease-out, transform 100ms ease-out;
}

.choice-card { padding: var(--space-4); border-radius: var(--radius-md); text-align: left; }
.choice-pill { padding: 0 var(--space-4); border-radius: 999px; }
.choice-card:hover, .choice-pill:hover { border-color: color-mix(in srgb, var(--color-primary) 55%, var(--color-border)); }
.choice-card.is-selected, .choice-pill.is-selected { color: var(--color-primary-hover); background: var(--color-primary-soft); border-color: var(--color-primary); }

.choice-row { margin-top: var(--space-4); display: flex; flex-wrap: wrap; gap: var(--space-2); }

.field { margin-top: var(--space-4); }
.optional-field { margin-top: var(--space-8); padding-top: var(--space-6); border-top: 1px solid var(--color-border); }

input, textarea {
  width: 100%;
  margin-top: var(--space-3);
  color: var(--color-foreground);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color 180ms ease-out, background-color 180ms ease-out;
}

input { min-height: 50px; padding: 0 var(--space-4); }
textarea { min-height: 130px; padding: var(--space-4); line-height: 1.75; resize: vertical; }
input:hover, textarea:hover { border-color: color-mix(in srgb, var(--color-primary) 35%, var(--color-border)); }
input:focus, textarea:focus { border-color: var(--color-primary); }
::placeholder { color: color-mix(in srgb, var(--color-muted) 70%, transparent); }

.field-meta { margin-top: var(--space-2); display: flex; justify-content: space-between; gap: var(--space-3); color: var(--color-muted); font-size: 12px; font-variant-numeric: tabular-nums; }
.field-error { min-height: 20px; margin: var(--space-2) 0 0; color: var(--color-error); font-size: 13px; }
.field-error:empty { min-height: 0; }

.material-field { margin-top: var(--space-6); padding: var(--space-5); background: var(--color-surface-alt); border-radius: var(--radius-md); }

.form-error {
  margin-top: var(--space-4);
  padding: var(--space-4);
  color: var(--color-error);
  background: var(--color-error-soft);
  border: 1px solid color-mix(in srgb, var(--color-error) 24%, transparent);
  border-radius: var(--radius-md);
}

.wizard-actions {
  position: sticky;
  bottom: 0;
  z-index: 20;
  margin-top: var(--space-5);
  padding: var(--space-4) 0 max(var(--space-4), env(safe-area-inset-bottom));
  display: flex;
  justify-content: space-between;
  gap: var(--space-3);
  background: color-mix(in srgb, var(--color-background) 94%, transparent);
  backdrop-filter: blur(10px);
}

.wizard-actions .primary-button { margin-left: auto; min-width: 132px; }

.loading-panel {
  min-height: calc(100dvh - 150px);
  padding: 80px 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-align: center;
  align-items: center;
}

.loading-panel h1 { max-width: 560px; font-size: clamp(30px, 6vw, 48px); }
.loading-panel > p:last-child { max-width: 520px; color: var(--color-muted); }
.loading-mark { width: 92px; height: 54px; margin-bottom: var(--space-8); display: flex; align-items: flex-end; justify-content: center; gap: 7px; }
.loading-mark span { width: 12px; height: 20px; background: var(--color-primary); border-radius: 999px; animation: loading-bars 900ms ease-in-out infinite alternate; }
.loading-mark span:nth-child(2) { height: 38px; animation-delay: 160ms; }
.loading-mark span:nth-child(3) { height: 28px; animation-delay: 320ms; }
@keyframes loading-bars { to { transform: translateY(-10px); opacity: .55; } }

.result-panel { padding: var(--space-10) 0 64px; }
.result-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: var(--space-4); }
.result-heading h1 { font-size: clamp(28px, 5vw, 42px); }
.model-badge { flex: none; padding: 6px 10px; color: var(--color-accent); background: var(--color-accent-soft); border-radius: 999px; font-size: 12px; font-weight: 750; }
.result-notice { margin: var(--space-6) 0; padding: var(--space-4); color: var(--color-accent); background: var(--color-accent-soft); border-left: 4px solid var(--color-accent); border-radius: 0 var(--radius-md) var(--radius-md) 0; font-size: 13px; }
.result-list { display: grid; gap: var(--space-4); }

.result-card { padding: var(--space-5); background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); }
.result-card-header { display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); }
.result-card-title { margin: 0; font-size: 18px; }
.result-card-note { margin: var(--space-1) 0 0; color: var(--color-muted); font-size: 12px; }
.result-editor { min-height: 180px; margin-top: var(--space-4); background: var(--color-background); }
.result-card-footer { margin-top: var(--space-3); display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); }
.result-char-count { color: var(--color-muted); font-size: 12px; font-variant-numeric: tabular-nums; }
.copy-button { min-height: 44px; padding: 0 var(--space-4); color: #fff; background: var(--color-accent); border: 0; border-radius: var(--radius-sm); cursor: pointer; font-weight: 750; transition: opacity 180ms ease-out, transform 100ms ease-out; }
.copy-button:hover { opacity: .86; }
.result-actions { margin-top: var(--space-6); display: flex; justify-content: space-between; gap: var(--space-3); }

.app-footer { min-height: 56px; padding-top: var(--space-4); display: flex; justify-content: space-between; gap: var(--space-4); color: var(--color-muted); border-top: 1px solid var(--color-border); font-size: 11px; }

.toast {
  position: fixed;
  z-index: 100;
  left: 50%;
  bottom: max(24px, env(safe-area-inset-bottom));
  max-width: calc(100vw - 32px);
  padding: 11px 16px;
  color: #fff;
  background: var(--color-foreground);
  border-radius: 999px;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 16px);
  transition: opacity 180ms ease-out, transform 180ms ease-out;
}

.toast.is-visible { opacity: 1; transform: translate(-50%, 0); }
.is-hidden { display: none !important; }

@media (max-width: 640px) {
  .app-header { min-height: 58px; }
  .text-button { max-width: 94px; text-align: right; line-height: 1.25; }
  .intro { min-height: calc(100dvh - 150px); padding-top: 48px; }
  .intro h1 { font-size: clamp(32px, 9vw, 38px); }
  .choice-grid, .choice-grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .step-panel { min-height: 410px; padding: var(--space-5); }
  .progress-header { align-items: flex-start; }
  .draft-status { max-width: 88px; text-align: right; line-height: 1.35; }
  .result-heading { display: block; }
  .model-badge { display: inline-block; margin-top: var(--space-3); }
  .result-actions { flex-direction: column-reverse; }
  .result-actions button { width: 100%; }
  .app-footer { align-items: flex-start; }
}

@media (max-width: 370px) {
  .choice-grid, .choice-grid.two { grid-template-columns: 1fr; }
  .choice-card { min-height: 48px; }
  .wizard-actions .primary-button { min-width: 116px; }
}

@media (orientation: landscape) and (max-height: 560px) {
  .intro { min-height: auto; padding-block: 40px; }
  .step-panel { min-height: 260px; }
  .loading-panel { min-height: auto; padding-block: 48px; }
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --color-primary: #e26b87;
    --color-primary-hover: #f08aa2;
    --color-primary-soft: #492634;
    --color-accent: #85c4b1;
    --color-accent-soft: #183b33;
    --color-background: #1d1719;
    --color-surface: #282023;
    --color-surface-alt: #33272b;
    --color-foreground: #f7edef;
    --color-muted: #c2b3b8;
    --color-border: #4b3c41;
    --color-error: #ff9aa5;
    --color-error-soft: #482329;
    --color-success: #8bd0b5;
    --color-ring: #ff9bb2;
  }
  body { background: radial-gradient(circle at 88% 2%, rgba(226, 107, 135, .12), transparent 24rem), var(--color-background); }
  .primary-button { color: #25161b; }
  .promise-row span, .result-notice, .model-badge { color: #b8ead9; }
  .copy-button { color: #14231f; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}