.brief-page {
  min-height: 100svh;
  background:
    radial-gradient(circle at 8% 14%, rgba(210, 224, 210, 0.8), transparent 30rem),
    radial-gradient(circle at 94% 84%, rgba(233, 83, 43, 0.18), transparent 30rem),
    var(--color-bg);
}

.brief-header {
  width: min(calc(100% - 3rem), 1220px);
  min-height: 5.25rem;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
  z-index: 3;
}

.brief-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.52rem;
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: -0.03em;
}

.brief-brand strong { font-weight: 700; }

.brief-brand-mark {
  width: 1.28rem;
  height: 1.7rem;
  display: grid;
  place-items: center;
}

.brief-brand-mark img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.brief-time {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.5rem 0.8rem;
  border: 1px solid var(--color-line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.55);
  color: var(--color-muted);
  font-size: 0.78rem;
}

.brief-time i {
  width: 0.42rem;
  height: 0.42rem;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 0 4px var(--color-accent-soft);
}

.brief-main {
  min-height: calc(100svh - 8.5rem);
  display: grid;
  place-items: center;
  padding: 2rem 1.5rem 3rem;
  position: relative;
  z-index: 2;
}

.brief-card {
  width: min(100%, 760px);
  min-height: 590px;
  padding: clamp(3.8rem, 7vw, 5.3rem) clamp(1.5rem, 6vw, 4rem) clamp(1.8rem, 5vw, 3.6rem);
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  border: 1px solid rgba(255, 255, 255, 0.92);
  border-radius: clamp(1.5rem, 4vw, 2.25rem);
  background: rgba(255, 255, 255, 0.78);
  box-shadow: 0 2rem 5rem rgba(20, 19, 15, 0.11);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.brief-progress {
  display: none;
  align-items: center;
  gap: 0.9rem;
  position: absolute;
  top: 1.55rem;
  left: clamp(1.5rem, 6vw, 4rem);
  right: clamp(1.5rem, 6vw, 4rem);
  color: var(--color-muted);
  font-size: 0.75rem;
}

.brief-progress-track {
  height: 4px;
  flex: 1;
  overflow: hidden;
  border-radius: 999px;
  background: var(--color-line);
}

.brief-progress-bar {
  width: 16.667%;
  height: 100%;
  border-radius: inherit;
  background: var(--color-accent);
  transition: width 450ms var(--ease);
}

.brief-step { display: none; }

.brief-step.is-active {
  display: block;
  animation: briefEnter 420ms var(--ease) both;
}

@keyframes briefEnter {
  from { opacity: 0; transform: translateY(0.75rem); }
  to { opacity: 1; transform: none; }
}

.brief-eyebrow {
  margin-bottom: 1rem;
  color: var(--color-accent);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.brief-step h1,
.brief-step h2 {
  max-width: 640px;
  color: var(--color-ink);
  font-weight: 700;
  letter-spacing: -0.055em;
  line-height: 0.98;
}

.brief-step h1 { font-size: clamp(3.3rem, 8vw, 5rem); }
.brief-step h2 { font-size: clamp(2.2rem, 5vw, 3.25rem); }

.brief-lead {
  max-width: 540px;
  margin: 1.35rem 0 1.8rem;
  color: var(--color-muted);
  font-size: clamp(1rem, 2vw, 1.15rem);
  line-height: 1.55;
}

.brief-helper {
  margin-top: 0.75rem;
  color: var(--color-muted);
  font-size: 0.82rem;
}

.brief-primary {
  min-height: 3.45rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.7rem;
  padding: 0 1.35rem;
  border: 0;
  border-radius: 0.9rem;
  background: var(--color-ink);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  transition: transform 180ms ease, background 180ms ease, opacity 180ms ease;
}

.brief-primary:hover { transform: translateY(-2px); background: #2b2925; }
.brief-primary[disabled] { opacity: 0.35; cursor: default; transform: none; }

.brief-choices {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem;
  margin-top: 1.7rem;
}

.brief-choice {
  min-height: 4.35rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--color-line);
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.62);
  color: var(--color-ink);
  text-align: left;
  font-weight: 600;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.brief-choice:hover { transform: translateY(-2px); border-color: var(--color-line-strong); }
.brief-choice.is-selected { border-color: var(--color-accent); background: var(--color-accent-soft); }
.brief-wide { grid-column: 1 / -1; }

.brief-icon {
  width: 2.35rem;
  height: 2.35rem;
  flex: 0 0 2.35rem;
  display: grid;
  place-items: center;
  border-radius: 0.75rem;
  background: var(--color-bg);
  font-size: 1rem;
}

.brief-choice small {
  display: block;
  margin-top: 0.08rem;
  color: var(--color-muted);
  font-size: 0.75rem;
  font-weight: 400;
  line-height: 1.3;
}

.brief-back {
  min-height: 2.75rem;
  margin-top: 1rem;
  padding: 0 0.4rem;
  background: transparent;
  color: var(--color-muted);
}

.brief-back:hover { color: var(--color-ink); }

.brief-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1.4rem;
}

.brief-nav .brief-back { margin-top: 0; }

.brief-fields,
.brief-field {
  display: grid;
  gap: 0.45rem;
}

.brief-fields { margin-top: 1.65rem; gap: 0.8rem; }
.brief-step > .brief-field { margin-top: 1.65rem; }

.brief-field {
  color: var(--color-muted);
  font-size: 0.78rem;
  font-weight: 600;
}

.brief-field input,
.brief-field textarea {
  width: 100%;
  border: 1px solid var(--color-line);
  border-radius: 0.9rem;
  background: rgba(255, 255, 255, 0.68);
  color: var(--color-ink);
  font: inherit;
  font-size: 1rem;
  font-weight: 400;
  outline: none;
  transition: border-color 180ms ease, box-shadow 180ms ease;
}

.brief-field input { height: 3.35rem; padding: 0 1rem; }
.brief-field textarea { min-height: 7.5rem; padding: 0.9rem 1rem; resize: vertical; line-height: 1.5; }
.brief-field input:focus,
.brief-field textarea:focus { border-color: var(--color-accent); box-shadow: 0 0 0 4px rgba(233, 83, 43, 0.1); }

.brief-privacy {
  margin-top: 0.8rem;
  color: var(--color-muted);
  font-size: 0.72rem;
}

.brief-success-mark {
  width: 4.6rem;
  height: 4.6rem;
  display: grid;
  place-items: center;
  margin-bottom: 1.5rem;
  border-radius: 1.35rem;
  background: #d2e0d2;
  font-size: 2rem;
  transform: rotate(-4deg);
}

.brief-success-actions { display: flex; align-items: center; gap: 1.25rem; flex-wrap: wrap; }
.brief-home-link { color: var(--color-muted); font-weight: 600; }
.brief-home-link:hover { color: var(--color-ink); }

.brief-footer {
  padding: 0 1.5rem 1.5rem;
  position: relative;
  z-index: 2;
  color: var(--color-muted);
  font-size: 0.72rem;
  text-align: center;
}

.brief-primary:focus-visible,
.brief-choice:focus-visible,
.brief-back:focus-visible,
.brief-field input:focus-visible,
.brief-field textarea:focus-visible,
.brief-brand:focus-visible,
.brief-home-link:focus-visible {
  outline: 3px solid rgba(233, 83, 43, 0.28);
  outline-offset: 3px;
}

@media (max-width: 640px) {
  .brief-header { width: calc(100% - 1.75rem); min-height: 4.5rem; }
  .brief-main { min-height: auto; padding: 1.2rem 0.75rem 2rem; }
  .brief-card { min-height: 650px; padding: 4rem 1.35rem 1.8rem; border-radius: 1.5rem; }
  .brief-progress { top: 1.35rem; left: 1.35rem; right: 1.35rem; }
  .brief-step h1 { font-size: clamp(3rem, 15vw, 4.1rem); }
  .brief-step h2 { font-size: clamp(2.15rem, 10vw, 2.75rem); }
  .brief-choices { grid-template-columns: 1fr; gap: 0.5rem; margin-top: 1.35rem; }
  .brief-choice { min-height: 3.85rem; }
  .brief-wide { grid-column: auto; }
  .brief-step > .brief-primary { width: 100%; }
  .brief-nav .brief-primary { flex: 1; }
  .brief-footer { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .brief-step.is-active { animation: none; }
  .brief-progress-bar,
  .brief-choice,
  .brief-primary { transition: none; }
}