:root {
  color-scheme: light;
  --ink: #151515;
  --muted: #626262;
  --border: #dedbd5;
  --surface: #ffffff;
  --surface-alt: #f7f5f1;
  --page: #fbfaf7;
  --primary: #ff5a1f;
  --primary-dark: #dc3f08;
  --primary-soft: #fff0e8;
  --success: #087a49;
  --success-soft: #eaf8f0;
  --warning: #9a4b00;
  --warning-soft: #fff4d8;
  --danger: #b42318;
  --danger-soft: #fef0ee;
  --shadow: 0 22px 55px rgba(21, 21, 21, 0.08);
  --shadow-strong: 0 28px 70px rgba(21, 21, 21, 0.18);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
[hidden] { display: none !important; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 10% 0%, rgba(255, 90, 31, 0.09), transparent 28rem),
    var(--page);
}

button, input, select, summary { font: inherit; }
button { cursor: pointer; }
button:disabled { cursor: not-allowed; opacity: 0.48; }
a { color: inherit; }

:focus-visible {
  outline: 3px solid #1d4ed8;
  outline-offset: 3px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  border-radius: 10px;
  background: var(--ink);
  color: white;
  font-weight: 800;
  text-decoration: none;
  transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }

.page-shell {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0 36px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--ink);
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 15px;
  background: var(--primary);
  color: white;
  font-size: 1.55rem;
  font-weight: 950;
  line-height: 1;
  box-shadow: 0 10px 24px rgba(255, 90, 31, 0.28);
}

.brand-copy { display: grid; line-height: 1; }
.brand-copy strong { font-size: 1.3rem; letter-spacing: -0.04em; }
.brand-copy small { margin-top: 5px; color: var(--muted); font-size: 0.72rem; font-weight: 700; }

.header-actions { display: flex; align-items: center; gap: 10px; }
.prototype-badge {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 6px 11px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary-dark);
  font-size: 0.75rem;
  font-weight: 850;
}

.layout { display: grid; gap: 24px; }

.card {
  background: rgba(255, 255, 255, 0.98);
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: var(--shadow);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  align-items: center;
  gap: 44px;
  min-height: 560px;
  padding: clamp(32px, 6vw, 66px);
  overflow: hidden;
  border-radius: 30px;
  background:
    radial-gradient(circle at 86% 8%, rgba(255, 90, 31, 0.32), transparent 22rem),
    var(--ink);
  color: white;
  box-shadow: var(--shadow-strong);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 700px;
  margin: 0;
  font-size: clamp(2.65rem, 6vw, 5.25rem);
  line-height: 0.97;
  letter-spacing: -0.065em;
}

.hero-subtitle {
  max-width: 680px;
  margin: 24px 0 0;
  color: rgba(255, 255, 255, 0.78);
  font-size: clamp(1.04rem, 2vw, 1.28rem);
  line-height: 1.55;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.hero .button.secondary {
  color: white;
  border-color: rgba(255, 255, 255, 0.28);
  background: rgba(255, 255, 255, 0.08);
}
.hero .button.secondary:hover { background: rgba(255, 255, 255, 0.15); }

.hero-proof {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  margin: 22px 0 0;
  padding: 0;
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.88rem;
  font-weight: 700;
  list-style: none;
}
.hero-proof li::before { content: "✓"; margin-right: 7px; color: #7ee2aa; }

.hero-demo {
  display: grid;
  gap: 14px;
  padding: 22px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.97);
  color: var(--ink);
  box-shadow: 0 28px 70px rgba(0, 0, 0, 0.26);
  transform: rotate(1.2deg);
}

.demo-topline { display: flex; align-items: center; gap: 9px; color: var(--muted); font-size: 0.84rem; }
.live-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--primary); box-shadow: 0 0 0 5px var(--primary-soft); }

.conversation-card { padding: 18px; border-radius: 16px; }
.conversation-card span { display: block; margin-bottom: 7px; font-size: 0.7rem; font-weight: 900; letter-spacing: 0.09em; text-transform: uppercase; }
.conversation-card p { margin: 0; font-size: 1.15rem; font-weight: 800; line-height: 1.4; }
.tutor-message { background: var(--ink); color: white; }
.tutor-message span { color: rgba(255, 255, 255, 0.6); }
.user-message { margin-left: 44px; background: var(--primary-soft); border: 1px solid #ffc4aa; }
.user-message span { color: var(--primary-dark); }
.demo-result { display: flex; align-items: center; gap: 11px; padding: 13px 15px; border-radius: 14px; background: var(--success-soft); color: var(--success); }
.demo-result > span { display: grid; place-items: center; flex: 0 0 28px; width: 28px; height: 28px; border-radius: 50%; background: var(--success); color: white; font-weight: 900; }
.demo-result p { margin: 0; line-height: 1.4; }

.how-card, .onboarding-card, .setup-card, .conversion-card { padding: clamp(24px, 4vw, 38px); }
.centered-heading { text-align: center; }
.centered-heading h2 { margin: 0; font-size: clamp(1.9rem, 4vw, 3rem); letter-spacing: -0.045em; }

.simple-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 28px;
}

.simple-step {
  min-height: 210px;
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--surface-alt);
}
.step-number, .step {
  display: grid;
  place-items: center;
  flex: 0 0 36px;
  width: 36px;
  height: 36px;
  border-radius: 12px;
  background: var(--primary);
  color: white;
  font-weight: 900;
}
.simple-step h3 { margin: 20px 0 8px; font-size: 1.16rem; }
.simple-step p { margin: 0; color: var(--muted); line-height: 1.58; }

.section-heading { display: flex; gap: 14px; align-items: flex-start; margin-bottom: 24px; }
.section-heading h2 { margin: 0 0 5px; font-size: clamp(1.55rem, 3vw, 2.15rem); letter-spacing: -0.035em; }
.section-heading p { margin: 0; color: var(--muted); line-height: 1.5; }

.onboarding-grid {
  display: grid;
  grid-template-columns: minmax(280px, 0.78fr) minmax(0, 1.22fr);
  gap: 16px;
}

.setup-panel {
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--surface-alt);
}
.setup-panel h3 { margin: 7px 0 8px; font-size: 1.25rem; }
.panel-copy { margin: 0 0 18px; color: var(--muted); line-height: 1.52; }
.signup-panel { align-self: start; }
.import-panel { grid-column: 2; grid-row: 1 / span 2; }
.member-panel { align-self: start; background: var(--success-soft); border-color: #a8dfbd; }
.member-panel p { color: var(--muted); line-height: 1.5; }
.option-kicker { color: var(--primary-dark); font-size: 0.73rem; font-weight: 900; letter-spacing: 0.09em; text-transform: uppercase; }

#signInForm, #otpForm, #saveDeckForm { display: grid; gap: 13px; }

.field { display: grid; gap: 8px; font-weight: 720; }
.field > span { display: flex; justify-content: space-between; gap: 8px; font-size: 0.9rem; }
.field output { color: var(--primary-dark); font-weight: 900; }
.full-width, .full-button { width: 100%; }

input[type="url"], input[type="email"], input[type="text"], select {
  width: 100%;
  min-height: 48px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: white;
  color: var(--ink);
  padding: 11px 13px;
  outline: none;
}
input[type="url"]:focus, input[type="email"]:focus, input[type="text"]:focus, select:focus { border-color: var(--primary); box-shadow: 0 0 0 4px rgba(255, 90, 31, 0.16); }
input[type="range"] { width: 100%; accent-color: var(--primary); }

.input-row { display: grid; grid-template-columns: 1fr auto; gap: 10px; }
.source-actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-top: 14px; }
.checkbox-row { display: inline-flex; align-items: center; gap: 9px; color: var(--muted); font-size: 0.92rem; }
.checkbox-row input { flex: 0 0 auto; width: 18px; height: 18px; accent-color: var(--primary); }
.consent-row { align-items: flex-start; line-height: 1.45; }
.helper { color: var(--muted); line-height: 1.55; font-size: 0.9rem; }
.safety-note { padding-left: 12px; border-left: 3px solid var(--warning); color: #754000; }

.inline-status { margin-top: 14px; padding: 11px 13px; border-radius: 11px; background: #efede8; color: var(--muted); font-size: 0.9rem; line-height: 1.45; }
.inline-status[data-type="success"] { background: var(--success-soft); color: var(--success); }
.inline-status[data-type="error"] { background: var(--danger-soft); color: var(--danger); }
.inline-status[data-type="loading"] { background: var(--primary-soft); color: var(--primary-dark); }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  border: 1px solid transparent;
  border-radius: 12px;
  padding: 11px 16px;
  font-weight: 850;
  line-height: 1.1;
  text-align: center;
  text-decoration: none;
  transition: transform 120ms ease, background 120ms ease, border-color 120ms ease;
}
.button:not(:disabled):active { transform: translateY(1px); }
.button.primary { background: var(--primary); color: white; }
.button.primary:hover:not(:disabled) { background: var(--primary-dark); }
.button.secondary { background: white; color: var(--ink); border-color: var(--border); }
.button.secondary:hover:not(:disabled) { background: #f3f1ed; }
.button.ghost { background: transparent; color: var(--ink); border-color: var(--border); }
.button.danger { background: var(--danger-soft); color: var(--danger); border-color: #fac4bd; }
.large-button { min-height: 54px; padding: 14px 20px; font-size: 1rem; }
.compact-button { min-height: 38px; padding: 8px 12px; }
.file-button { display: inline-grid; place-items: center; }

.plain-fieldset { border: 0; padding: 0; margin: 0; min-width: 0; }
.plain-fieldset:disabled { opacity: 0.55; }
.lock-notice { margin-bottom: 16px; padding: 12px 14px; border: 1px solid #f6c36f; border-radius: 12px; background: var(--warning-soft); color: var(--warning); font-size: 0.91rem; line-height: 1.45; }
.mapping-panel { margin-top: 18px; padding: 18px; background: white; border: 1px solid var(--border); border-radius: 14px; }
.mapping-panel h3 { margin: 0 0 14px; font-size: 1rem; }
.mapping-footer { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin-top: 14px; color: var(--muted); }

.grid { display: grid; gap: 16px; }
.three-columns { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.two-columns { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.mode-picker { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; border: 0; padding: 0; margin: 0; }
.mode-card { position: relative; display: flex; align-items: flex-start; gap: 13px; min-height: 132px; border: 2px solid var(--border); border-radius: 18px; padding: 20px; cursor: pointer; background: white; }
.mode-card:has(input:checked) { border-color: var(--primary); background: var(--primary-soft); box-shadow: 0 0 0 4px rgba(255, 90, 31, 0.10); }
.mode-card input { margin-top: 5px; accent-color: var(--primary); }
.mode-icon { display: grid; place-items: center; flex: 0 0 38px; width: 38px; height: 38px; border-radius: 12px; background: white; font-size: 1.1rem; }
.mode-copy { display: grid; gap: 7px; }
.mode-copy strong { font-size: 1.05rem; }
.mode-copy small { color: var(--muted); line-height: 1.45; }

.advanced-options { margin-top: 18px; border: 1px solid var(--border); border-radius: 14px; background: var(--surface-alt); }
.advanced-options summary { min-height: 48px; padding: 14px 16px; cursor: pointer; font-weight: 800; }
.advanced-content { display: grid; gap: 16px; padding: 0 16px 18px; }
.start-button { width: 100%; margin-top: 20px; min-height: 56px; font-size: 1.05rem; }
.start-note { margin: 12px auto 0; max-width: 760px; color: var(--muted); text-align: center; font-size: 0.83rem; line-height: 1.5; }

.notice { margin-bottom: 18px; padding: 13px 15px; border-radius: 12px; }
.notice.warning { background: var(--warning-soft); color: var(--warning); border: 1px solid #f6c36f; }

.player-card { padding: clamp(22px, 4vw, 34px); }
.player-topline { display: flex; justify-content: space-between; gap: 12px; align-items: center; font-weight: 800; }
.player-topline > div { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.badge { display: inline-flex; padding: 5px 9px; border-radius: 999px; background: var(--surface-alt); color: var(--muted); font-size: 0.78rem; }
.status-badge { padding: 7px 11px; border-radius: 999px; background: var(--surface-alt); color: var(--muted); font-size: 0.82rem; }
.status-badge[data-status="running"], .status-badge[data-status="listening"], .status-badge[data-status="waiting"] { background: var(--primary-soft); color: var(--primary-dark); }
.status-badge[data-status="paused"] { background: var(--warning-soft); color: var(--warning); }
.status-badge[data-status="complete"] { background: var(--success-soft); color: var(--success); }
.progress-track { height: 8px; margin: 15px 0 24px; background: #ebe8e2; border-radius: 99px; overflow: hidden; }
.progress-track > div { height: 100%; width: 0; background: var(--primary); transition: width 200ms ease; }
.question-card, .answer-card, .response-card { border-radius: 19px; padding: 23px; }
.question-card { background: var(--ink); color: white; }
.answer-card { margin-top: 12px; background: var(--success-soft); color: #075234; border: 1px solid #a8dfbd; }
.response-card { margin-top: 12px; background: var(--primary-soft); border: 1px solid #ffc4aa; }
.card-label { display: block; margin-bottom: 10px; font-size: 0.71rem; font-weight: 900; letter-spacing: 0.1em; text-transform: uppercase; opacity: 0.68; }
.question-card p, .answer-card p, .response-card p { margin: 0; font-size: clamp(1.15rem, 2.5vw, 1.55rem); line-height: 1.5; }
.response-card small { display: block; margin-top: 9px; color: var(--muted); }
.listening { display: inline-flex; align-items: center; gap: 5px; margin-top: 14px; color: var(--primary-dark); font-weight: 800; }
.listening span { width: 5px; height: 14px; border-radius: 4px; background: var(--primary); animation: pulse 850ms infinite ease-in-out; }
.listening span:nth-child(2) { animation-delay: 120ms; }
.listening span:nth-child(3) { animation-delay: 240ms; }
@keyframes pulse { 0%, 100% { transform: scaleY(0.45); } 50% { transform: scaleY(1); } }

.review-decision { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin-top: 14px; padding: 14px; border: 1px solid #f6c36f; border-radius: 14px; background: var(--warning-soft); color: #754000; }
.review-decision > span { line-height: 1.45; font-size: 0.92rem; }
.review-decision > div { display: flex; flex-wrap: wrap; gap: 8px; flex: 0 0 auto; }
.transport-controls { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-top: 22px; }
.icon-button { width: 46px; height: 46px; border-radius: 50%; border: 1px solid var(--border); background: white; font-size: 1.25rem; cursor: pointer; }
.shortcut-help { margin: 14px 0 0; text-align: center; color: var(--muted); font-size: 0.8rem; }

.conversion-card { text-align: center; }
.conversion-card h2 { margin: 8px 0; font-size: clamp(1.7rem, 4vw, 2.6rem); letter-spacing: -0.04em; }
.conversion-card > p { max-width: 680px; margin: 0 auto; color: var(--muted); line-height: 1.55; }
.conversion-actions { display: flex; justify-content: center; flex-wrap: wrap; gap: 10px; margin-top: 18px; }

footer { margin-top: 30px; color: var(--muted); font-size: 0.8rem; line-height: 1.55; text-align: center; }
footer p { margin: 7px auto; max-width: 920px; }
.footer-brand { display: inline-flex; align-items: center; gap: 8px; margin-bottom: 5px; color: var(--ink); }
.small-mark { width: 30px; height: 30px; border-radius: 9px; font-size: 1rem; box-shadow: none; }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; min-height: 0; }
  .hero-demo { max-width: 600px; transform: none; }
  .onboarding-grid { grid-template-columns: 1fr; }
  .import-panel { grid-column: auto; grid-row: auto; }
}

@media (max-width: 760px) {
  .page-shell { width: min(100% - 20px, 1160px); padding-top: 16px; }
  .brand-copy small { display: none; }
  .prototype-badge { font-size: 0.69rem; }
  .hero { gap: 28px; padding: 30px 21px; border-radius: 22px; }
  .hero h1 { font-size: clamp(2.5rem, 13vw, 4rem); }
  .hero-actions { display: grid; }
  .hero-actions .button { width: 100%; }
  .hero-proof { display: grid; gap: 8px; }
  .hero-demo { padding: 17px; }
  .user-message { margin-left: 22px; }
  .simple-steps, .three-columns, .two-columns, .mode-picker { grid-template-columns: 1fr; }
  .simple-step { min-height: 0; }
  .input-row { grid-template-columns: 1fr; }
  .mapping-footer { align-items: stretch; flex-direction: column; }
  .how-card, .onboarding-card, .setup-card, .conversion-card, .player-card { padding: 20px; border-radius: 18px; }
  .transport-controls .button { flex: 1 1 110px; }
  .player-topline { align-items: flex-start; }
  .review-decision { align-items: stretch; flex-direction: column; }
  .review-decision > div { width: 100%; }
  .review-decision .button { flex: 1 1 100px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}