/* ── style.css ───────────────────────────────────────────────────────────────
   Base styles: variables, layout, header, card, textarea, normal style
   buttons, slider, submit button, output area, error message, top controls,
   and footer.
   Pro mode → style-pro.css
   Auth modal → style-auth.css
   Responsive  → style-responsive.css
*/

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  /* Typography */
  --font-display: 'Noto Serif SC', 'STSong', 'Songti SC', serif;
  --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --weight-hairline: 300;
  --weight-book: 400;
  --weight-bold: 700;
  --weight-black: 900;

  /* Color — Amber Desk at Night */
  --bg: #09090d;
  --surface: #111118;
  --surface2: #1a1a22;
  --border: rgba(255, 255, 255, 0.07);
  --accent: #4db8b0;
  --accent2: #e8b44b;
  --text: #e4e0da;
  --muted: #817e78;
  --glow: rgba(77, 184, 176, 0.25);
  --glow-amber: rgba(232, 180, 75, 0.18);
  --danger: #d47a6b;

  /* Motion */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 0.3s;
  --dur-base: 0.6s;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;

  /* Radii */
  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 20px;
}

html,
body {
  height: 100%;
  font-family: var(--font-body);
  font-weight: var(--weight-hairline);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* ── scrollbar ── */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg);
}
::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

/* ── layout ── */
.page {
  max-width: 860px;
  margin: 0 auto;
  padding: 40px 24px 80px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

/* ── header ── */
header {
  text-align: center;
  padding: 12px 0 4px;
}

.company-logo {
  height: 36px;
  width: auto;
  opacity: 0.75;
  margin: 0 auto 10px;
  display: block;
}

header h1 {
  font-family: var(--font-display);
  font-weight: var(--weight-black);
  font-size: 2rem;
  letter-spacing: -0.02em;
  color: var(--text);
}

header p {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.88rem;
  font-family: var(--font-body);
  letter-spacing: 0.04em;
}

/* ── card ── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

label.field-label {
  font-size: 0.8rem;
  font-family: var(--font-body);
  color: var(--muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

label.field-label.field-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.story-input-section {
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-height: 420px;
  overflow: hidden;
  opacity: 1;
  transform: translateY(0);
  transition:
    max-height 0.28s ease,
    opacity 0.2s ease,
    transform 0.28s ease,
    margin-bottom 0.28s ease;
}

.story-input-section.wv-auto-input-hidden {
  max-height: 0;
  margin-bottom: -14px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-8px);
}

/* ── textarea ── */
#input-text {
  width: 100%;
  min-height: 180px;
  resize: vertical;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  color: var(--text);
  font-family: inherit;
  font-size: 1rem;
  line-height: 1.8;
  outline: none;
  transition:
    border-color 0.2s,
    box-shadow 0.2s;
}

#input-text::placeholder {
  color: var(--muted);
}

#input-text:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--glow);
}

/* ── normal-mode style buttons ── */
.style-group {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.style-btn {
  flex: 1;
  min-width: 80px;
  padding: 10px 0;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--muted);
  font-family: var(--font-body);
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.18s;
  text-align: center;
}

.style-btn:hover {
  border-color: var(--accent2);
  color: var(--accent2);
}

.style-btn.active {
  background: var(--accent);
  border-color: transparent;
  color: var(--bg);
  box-shadow: 0 0 14px var(--glow);
}

.style-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  box-shadow: none;
}

.style-btn:disabled:hover {
  border-color: var(--border);
  color: var(--muted);
}

.style-btn:disabled:not(.active) {
  background: rgba(26, 26, 34, 0.55);
}

/* ── slider ── */
.slider-row {
  display: flex;
  align-items: center;
  gap: 14px;
}

#length-slider {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

#length-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--glow);
  cursor: pointer;
  transition:
    transform 0.15s,
    box-shadow 0.15s;
}

#length-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  box-shadow: 0 0 16px var(--glow);
}

#length-display {
  font-family: var(--font-body);
  font-size: 0.88rem;
  color: var(--accent2);
  min-width: 52px;
  text-align: right;
}

/* ── submit button ── */
#submit-btn {
  width: 100%;
  padding: 14px;
  background: var(--accent);
  border: none;
  border-radius: 10px;
  color: var(--bg);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: var(--weight-bold);
  letter-spacing: 0.1em;
  cursor: pointer;
  box-shadow: 0 4px 20px var(--glow);
  transition:
    opacity 0.2s,
    transform 0.15s,
    box-shadow 0.2s;
}

#submit-btn:hover:not(:disabled) {
  opacity: 0.92;
  transform: translateY(-1px);
  box-shadow: 0 6px 28px var(--glow);
}

#submit-btn:active:not(:disabled) {
  transform: translateY(0);
}

#submit-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ── output ── */
#output-card {
  display: none;
}

.output-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.output-title {
  font-size: 0.8rem;
  font-family: var(--font-body);
  color: var(--muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

#copy-btn,
#clear-output-btn,
#stop-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--muted);
  font-family: var(--font-body);
  font-size: 0.78rem;
  padding: 4px 10px;
  cursor: pointer;
  transition: all 0.2s;
}

#copy-btn:hover,
#clear-output-btn:hover,
#stop-btn:hover {
  border-color: var(--accent2);
  color: var(--accent2);
}

#clear-input-btn {
  background: none;
  border: none;
  color: var(--muted);
  font-family: var(--font-body);
  font-size: 0.75rem;
  padding: 0;
  cursor: pointer;
  text-transform: none;
  letter-spacing: 0;
  transition: color 0.2s;
}

#clear-input-btn:hover {
  color: var(--accent2);
}

#output-text {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  font-size: 1rem;
  line-height: 2;
  min-height: 120px;
  white-space: pre-wrap;
  word-break: break-all;
  color: var(--text);
  position: relative;
}

/* blinking cursor */
#output-text::after {
  content: "▋";
  color: var(--accent);
  animation: blink 0.8s step-end infinite;
  display: inline;
}

#output-text.done::after {
  display: none;
}

@keyframes blink {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0;
  }
}

/* ── error ── */
.error-msg {
  color: var(--danger);
  font-family: var(--font-body);
  font-size: 0.88rem;
  padding: 10px 14px;
  background: rgba(212, 122, 107, 0.08);
  border: 1px solid rgba(212, 122, 107, 0.2);
  border-radius: 8px;
  display: none;
}

/* ── footer ── */
footer {
  text-align: center;
  color: var(--muted);
  font-family: var(--font-body);
  font-size: 0.75rem;
  opacity: 0.5;
}

/* ── 顶部控制按钮组（桌面：右上角行排）── */
#top-controls {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 1000;
  display: flex;
  gap: 8px;
  align-items: center;
}

#pro-toggle {
  padding: 7px 16px;
  background: rgba(9, 9, 13, 0.82);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--muted);
  font-family: var(--font-body);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition:
    border-color 0.2s,
    color 0.2s;
  white-space: nowrap;
}

#pro-toggle:hover {
  border-color: var(--accent2);
  color: var(--accent2);
}

/* ── Page-load stagger animation ── */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}

.page > * {
  opacity: 0;
  animation: fadeInUp 0.6s var(--ease-out-expo) forwards;
}

.page > *:nth-child(1) { animation-delay: 0.05s; }
.page > *:nth-child(2) { animation-delay: 0.12s; }
.page > *:nth-child(3) { animation-delay: 0.19s; }
.page > *:nth-child(4) { animation-delay: 0.26s; }
.page > *:nth-child(5) { animation-delay: 0.33s; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .page > * { opacity: 1; animation: none; }
}
.lang-picker {
  position: relative;
  min-width: 108px;
}

.lang-picker__button {
  width: 100%;
  padding: 7px 32px 7px 16px;
  background: rgba(9, 9, 13, 0.82);
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--muted);
  font-family: var(--font-body);
  font-size: 0.76rem;
  text-align: center;
  cursor: pointer;
}

.lang-picker__button::after {
  content: "▾";
  position: absolute;
  right: 13px;
  color: var(--muted);
}

.lang-picker.open .lang-picker__button,
.lang-picker__button:hover {
  border-color: var(--accent2);
  color: var(--accent2);
}

.lang-picker__menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  z-index: 1200;
  display: none;
  padding: 6px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(13, 13, 20, 0.96);
  box-shadow: 0 16px 34px rgba(0, 0, 0, 0.38);
  backdrop-filter: blur(14px);
}

.lang-picker.open .lang-picker__menu {
  display: grid;
  gap: 4px;
}

.lang-picker__option {
  border: 0;
  border-radius: 10px;
  padding: 8px 10px;
  background: transparent;
  color: var(--muted);
  font-family: var(--font-body);
  font-size: 0.78rem;
  text-align: center;
  cursor: pointer;
}

.lang-picker__option:hover,
.lang-picker__option.is-active {
  background: rgba(77, 184, 176, 0.16);
  color: var(--text);
}