:root {
  --bg: #0a0a0f;
  --bg-elev: #101019;
  --card: rgba(255, 255, 255, 0.04);
  --card-border: rgba(255, 255, 255, 0.08);
  --card-hover: rgba(255, 255, 255, 0.06);
  --text: #f4f4f6;
  --text-dim: #a4a4b0;
  --text-mute: #6f6f7e;
  --accent: #7c5cff;
  --accent-2: #ff7ab6;
  --accent-soft: rgba(124, 92, 255, 0.14);
  --accent-ring: rgba(124, 92, 255, 0.45);
  --success: #4ee39a;
  --radius: 16px;
  --radius-lg: 22px;
  --shadow-glow: 0 0 0 1px rgba(124, 92, 255, 0.35), 0 18px 60px -20px rgba(124, 92, 255, 0.55);
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-serif: "Instrument Serif", Georgia, serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.5;
  min-height: 100vh;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: 0; background: none; color: inherit; }
textarea { font-family: inherit; }

/* ---------- background ---------- */
.bg-grain {
  position: fixed; inset: 0; z-index: -3; pointer-events: none;
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(124, 92, 255, 0.15), transparent 60%),
    linear-gradient(180deg, #0a0a0f 0%, #0c0c14 100%);
}
.bg-glow {
  position: fixed; z-index: -2; pointer-events: none;
  width: 520px; height: 520px; border-radius: 50%;
  filter: blur(90px); opacity: 0.35;
}
.bg-glow--a { background: #7c5cff; top: -180px; right: -120px; }
.bg-glow--b { background: #ff7ab6; bottom: -220px; left: -140px; opacity: 0.22; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 20px;
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  background: rgba(10, 10, 15, 0.6);
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.brand { display: inline-flex; align-items: center; gap: 10px; }
.brand__mark {
  width: 32px; height: 32px; border-radius: 9px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, #7c5cff, #ff7ab6);
  color: #fff; font-weight: 800; font-size: 15px;
  box-shadow: 0 8px 24px -8px rgba(124, 92, 255, 0.6);
}
.brand__name { font-weight: 700; letter-spacing: -0.01em; }
.brand__dot { color: var(--accent); }

.site-nav { display: flex; gap: 20px; font-size: 14px; color: var(--text-dim); }
.site-nav a { transition: color 0.15s; }
.site-nav a:hover { color: var(--text); }
@media (max-width: 520px) {
  .site-nav { gap: 14px; font-size: 13px; }
  .site-nav a:nth-child(3) { display: none; }
}

/* ---------- hero ---------- */
.hero {
  max-width: 720px; margin: 0 auto;
  padding: 56px 20px 24px;
  text-align: center;
}

.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12px; letter-spacing: 0.04em; text-transform: uppercase;
  color: var(--text-dim);
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--card);
  border: 1px solid var(--card-border);
  margin: 0 0 22px;
}
.pulse {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 0 rgba(78, 227, 154, 0.6);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(78, 227, 154, 0.6); }
  70% { box-shadow: 0 0 0 8px rgba(78, 227, 154, 0); }
  100% { box-shadow: 0 0 0 0 rgba(78, 227, 154, 0); }
}

.hero h1 {
  font-size: clamp(40px, 8vw, 68px);
  line-height: 1.02;
  letter-spacing: -0.03em;
  margin: 0 0 18px;
  font-weight: 800;
}
.hero h1 em {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  background: linear-gradient(120deg, #a88aff 0%, #ff9bc8 100%);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
  letter-spacing: -0.01em;
}
.hero .sub {
  font-size: clamp(16px, 2.4vw, 18px);
  color: var(--text-dim);
  max-width: 540px;
  margin: 0 auto;
  font-weight: 400;
}

/* ---------- tool ---------- */
.tool { max-width: 720px; margin: 0 auto; padding: 20px 16px 32px; }

.tool__card {
  background: linear-gradient(180deg, rgba(255,255,255,0.045), rgba(255,255,255,0.02));
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 18px;
  backdrop-filter: blur(8px);
  box-shadow: 0 30px 80px -40px rgba(0, 0, 0, 0.6);
}
@media (min-width: 640px) {
  .tool__card { padding: 24px; }
}

.tool__label {
  display: block;
  font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--text-mute);
  margin: 0 0 8px;
  font-weight: 600;
}
.tool__label--inline { display: inline-block; margin: 0; }

#message {
  width: 100%;
  min-height: 120px;
  padding: 14px 16px;
  font-size: 17px;
  line-height: 1.5;
  color: var(--text);
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 14px;
  resize: vertical;
  transition: border-color 0.15s, box-shadow 0.15s;
  outline: none;
}
#message:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}
#message::placeholder { color: #5a5a6a; }

.tool__meta {
  display: flex; justify-content: space-between; align-items: center;
  margin-top: 8px;
  font-size: 12px; color: var(--text-mute);
}
.linkish { color: var(--text-mute); font-size: 12px; padding: 4px 8px; border-radius: 6px; }
.linkish:hover { color: var(--text); background: var(--card); }

.tool__section { margin-top: 20px; }
.tool__row { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 10px; }
.tool__hint { font-size: 12px; color: var(--text-mute); }

.tones {
  display: flex; flex-wrap: wrap; gap: 8px;
}
.tone {
  padding: 9px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-dim);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--card-border);
  border-radius: 999px;
  transition: all 0.15s;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}
.tone:hover { color: var(--text); background: var(--card-hover); }
.tone.is-active {
  background: linear-gradient(135deg, rgba(124,92,255,0.2), rgba(255,122,182,0.14));
  color: #fff;
  border-color: var(--accent-ring);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.tool__section--options { margin-top: 16px; }
.checkbox {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 14px; color: var(--text-dim);
  cursor: pointer;
  user-select: none;
}
.checkbox input {
  appearance: none; -webkit-appearance: none;
  width: 18px; height: 18px; border-radius: 5px;
  border: 1px solid rgba(255,255,255,0.15);
  background: rgba(0,0,0,0.3);
  display: inline-grid; place-items: center;
  cursor: pointer;
  transition: all 0.15s;
}
.checkbox input:checked {
  background: var(--accent); border-color: var(--accent);
}
.checkbox input:checked::after {
  content: "✓"; color: #fff; font-size: 12px; font-weight: 700;
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  padding: 14px 22px;
  font-size: 15px; font-weight: 600;
  border-radius: 12px;
  transition: transform 0.1s, box-shadow 0.2s, opacity 0.2s;
  -webkit-tap-highlight-color: transparent;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }

.btn--primary {
  width: 100%;
  margin-top: 22px;
  background: linear-gradient(135deg, #7c5cff 0%, #ff7ab6 100%);
  color: #fff;
  box-shadow: var(--shadow-glow);
  padding: 16px 24px;
  font-size: 16px;
}
.btn--primary:hover { box-shadow: 0 0 0 1px rgba(124, 92, 255, 0.5), 0 24px 70px -20px rgba(124, 92, 255, 0.8); }
.btn--primary:disabled { opacity: 0.6; cursor: wait; }

.btn__spinner {
  display: none;
  width: 16px; height: 16px;
  border: 2px solid rgba(255,255,255,0.35);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
.is-loading .btn__text { opacity: 0.8; }
.is-loading .btn__spinner { display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }

.btn--ghost {
  color: var(--text);
  background: var(--card);
  border: 1px solid var(--card-border);
  padding: 12px 20px;
}
.btn--ghost:hover { background: var(--card-hover); }

/* ---------- output ---------- */
.output {
  margin-top: 20px;
  display: flex; flex-direction: column; gap: 12px;
}
.output__item {
  background: linear-gradient(180deg, rgba(124,92,255,0.08), rgba(255,122,182,0.04));
  border: 1px solid rgba(124,92,255,0.2);
  border-radius: 14px;
  padding: 16px;
  animation: slideIn 0.35s ease-out;
}
@keyframes slideIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
.output__label {
  font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--text-mute);
  margin-bottom: 8px;
  display: flex; justify-content: space-between; align-items: center;
}
.output__text {
  font-size: 17px; line-height: 1.5;
  color: var(--text);
  white-space: pre-wrap;
  word-wrap: break-word;
}
.output__actions {
  display: flex; gap: 8px; margin-top: 12px; flex-wrap: wrap;
}
.output__btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 12px;
  font-size: 13px; font-weight: 500;
  color: var(--text-dim);
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  transition: all 0.15s;
}
.output__btn:hover { color: var(--text); background: var(--card-hover); }
.output__btn.is-copied { color: var(--success); border-color: rgba(78,227,154,0.3); }

.output__error {
  padding: 14px 16px;
  background: rgba(255, 107, 107, 0.08);
  border: 1px solid rgba(255, 107, 107, 0.2);
  border-radius: 12px;
  color: #ffbcbc;
  font-size: 14px;
}

/* ---------- trust ---------- */
.trust {
  max-width: 720px; margin: 0 auto;
  padding: 28px 20px;
  text-align: center;
}
.trust__line {
  color: var(--text-dim);
  font-size: 14px;
  margin: 0 0 10px;
}
.trust__line .dot { color: var(--success); font-size: 8px; vertical-align: middle; margin-right: 6px; }
.trust__line .sep { color: var(--text-mute); margin: 0 8px; }
.trust__note {
  color: var(--text-mute);
  font-size: 14px;
  max-width: 520px; margin: 0 auto;
  line-height: 1.6;
}

/* ---------- examples ---------- */
.examples {
  max-width: 1080px; margin: 40px auto 0;
  padding: 32px 20px;
}
.section-title {
  font-size: clamp(28px, 4.5vw, 40px);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0 0 8px;
}
.section-title .arrow {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  color: var(--accent);
}
.section-sub { color: var(--text-dim); margin: 0 0 24px; }

.example-scroll {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 14px;
}
@media (max-width: 640px) {
  .example-scroll {
    display: flex;
    gap: 14px;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    padding: 0 20px 14px;
    margin: 0 -20px;
  }
  .example { min-width: 78vw; scroll-snap-align: start; }
}
.example {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 18px;
  display: flex; flex-direction: column; gap: 10px;
}
.example__before, .example__after { display: flex; flex-direction: column; gap: 8px; }
.example__before p, .example__after p { margin: 0; font-size: 15px; line-height: 1.45; }
.example__before p { color: var(--text-dim); }
.example__after p { color: var(--text); }
.example__arrow {
  color: var(--accent);
  font-size: 18px;
  text-align: left;
  margin: 2px 0;
}
.tag {
  display: inline-flex; align-items: center;
  font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 6px;
  align-self: flex-start;
  font-weight: 600;
}
.tag--before { background: rgba(255,255,255,0.05); color: var(--text-mute); }
.tag--after  { background: linear-gradient(135deg, rgba(124,92,255,0.2), rgba(255,122,182,0.15)); color: #d9cbff; }

/* ---------- scenarios ---------- */
.scenarios { max-width: 1080px; margin: 24px auto 0; padding: 32px 20px; }
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 10px;
}
.scenario {
  display: flex; flex-direction: column; align-items: flex-start; gap: 6px;
  padding: 16px;
  text-align: left;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  transition: all 0.15s;
}
.scenario:hover {
  background: var(--card-hover);
  transform: translateY(-2px);
  border-color: var(--accent-ring);
}
.scenario__emoji { font-size: 22px; }
.scenario__title { font-weight: 600; color: var(--text); font-size: 14px; }
.scenario__hint { font-size: 12px; color: var(--text-mute); }

/* ---------- usecases ---------- */
.usecases { max-width: 1080px; margin: 24px auto 0; padding: 32px 20px; }
.usecase-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
  margin-top: 8px;
}
.usecase {
  padding: 18px;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
}
.usecase h3 { margin: 0 0 6px; font-size: 16px; font-weight: 700; letter-spacing: -0.01em; }
.usecase p { margin: 0; color: var(--text-dim); font-size: 14px; line-height: 1.5; }

/* ---------- cta ---------- */
.cta {
  max-width: 720px; margin: 40px auto 80px;
  padding: 48px 24px;
  text-align: center;
}
.cta h2 {
  font-size: clamp(26px, 4.2vw, 38px);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0 0 20px;
  line-height: 1.15;
  max-width: 560px;
  margin-left: auto; margin-right: auto;
}

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid rgba(255,255,255,0.05);
  padding: 32px 20px 40px;
}
.site-footer__inner {
  max-width: 1080px; margin: 0 auto;
  display: flex; flex-direction: column; gap: 16px; align-items: flex-start;
}
.site-footer nav {
  display: flex; flex-wrap: wrap; gap: 16px;
  font-size: 14px; color: var(--text-dim);
}
.site-footer nav a { transition: color 0.15s; }
.site-footer nav a:hover { color: var(--text); }
.site-footer__fine { font-size: 12px; color: var(--text-mute); margin: 4px 0 0; }

/* ---------- guides (shared) ---------- */
.guide {
  max-width: 720px; margin: 0 auto;
  padding: 48px 20px;
}
.guide .back {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--text-dim);
  font-size: 14px;
  margin-bottom: 28px;
}
.guide .back:hover { color: var(--text); }
.guide h1 {
  font-size: clamp(32px, 5.6vw, 48px);
  letter-spacing: -0.025em;
  line-height: 1.1;
  margin: 0 0 18px;
  font-weight: 800;
}
.guide .lede {
  font-size: 18px; color: var(--text-dim); line-height: 1.6;
  margin: 0 0 36px;
}
.guide h2 {
  font-size: 22px; margin: 36px 0 12px;
  letter-spacing: -0.01em;
}
.guide p, .guide li { color: var(--text-dim); font-size: 16px; line-height: 1.7; }
.guide ul { padding-left: 20px; }
.guide .embed-hint {
  margin: 32px 0 16px;
  padding: 14px 16px;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  font-size: 14px;
  color: var(--text-dim);
}

/* ---------- how-it-works ---------- */
.how-it-works { max-width: 1080px; margin: 40px auto 0; padding: 32px 20px; }
.steps-flow {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin-top: 16px;
}
.step-card {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  padding: 24px;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  transition: all 0.2s ease;
}
.step-card:hover {
  border-color: rgba(255, 255, 255, 0.12);
  background: var(--card-hover);
}
.step-num {
  font-family: var(--font-serif);
  font-size: 48px;
  font-style: italic;
  font-weight: 400;
  line-height: 0.8;
  color: var(--accent);
  opacity: 0.85;
  margin-top: -2px;
}
.step-content {
  display: flex;
  flex-direction: column;
}
.step-content h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}
.step-content p {
  margin: 0;
  color: var(--text-dim);
  font-size: 14px;
  line-height: 1.55;
}

/* ---------- features ---------- */
.features { max-width: 1080px; margin: 40px auto 0; padding: 32px 20px; }
.features-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 16px;
  margin-top: 16px;
}
.feature-card {
  padding: 24px;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  transition: all 0.2s ease;
}
.feature-card:hover {
  border-color: var(--accent-ring);
  background: var(--card-hover);
}
.feature-card.highlight {
  background: linear-gradient(135deg, rgba(124, 92, 255, 0.08) 0%, rgba(255, 122, 182, 0.04) 100%);
  border-color: rgba(124, 92, 255, 0.25);
}
.feature-card.span-7 { grid-column: span 7; }
.feature-card.span-5 { grid-column: span 5; }

.feature-card h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}
.feature-card p {
  margin: 0;
  color: var(--text-dim);
  font-size: 14px;
  line-height: 1.6;
}

@media (max-width: 768px) {
  .features-grid {
    grid-template-columns: 1fr;
  }
  .feature-card.span-7, .feature-card.span-5 {
    grid-column: span 1;
  }
}

/* ---------- faq ---------- */
.faq { max-width: 1080px; margin: 40px auto 0; padding: 32px 20px; }
.faq-list { display: flex; flex-direction: column; gap: 14px; margin-top: 16px; }
.faq-item {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 24px;
  transition: all 0.2s ease;
}
.faq-item:hover {
  border-color: rgba(255, 255, 255, 0.12);
  background: var(--card-hover);
}
.faq-item h3 { margin: 0 0 10px; font-size: 16px; font-weight: 700; color: var(--text); }
.faq-item p { margin: 0; color: var(--text-dim); font-size: 14.5px; line-height: 1.6; }

/* ---------- utility ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}