.brief-page { background: var(--surface); }
.brief-page .header .nav { display: flex; }
@media (max-width: 1024px) {
  .brief-page .header:not(.is-scrolled) { color: #fff; }
}

.brief {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  min-height: 100dvh;
}

.brief-stage {
  position: relative;
  overflow: hidden;
  background: radial-gradient(120% 90% at 30% 20%, #1A2230 0%, #0B0F14 62%);
}
.brief-stage canvas {
  position: absolute;
  inset: 0;
  width: 100% !important;
  height: 100% !important;
  display: block;
}
.brief-stage-glow {
  position: absolute;
  left: 15%;
  right: 15%;
  bottom: -30%;
  height: 60%;
  background: radial-gradient(closest-side, rgba(75, 191, 208, 0.35), transparent);
  filter: blur(40px);
  pointer-events: none;
}
.brief-status {
  position: absolute;
  left: var(--gutter);
  bottom: 24px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.brief-status i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  animation: pulse 2s infinite;
}

.brief-panel {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--surface);
  color: var(--ink);
  padding: calc(var(--header-h) + 24px) clamp(24px, 4vw, 64px) 28px;
  min-height: 100dvh;
}
.brief-progress {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--line);
}
.brief-progress i {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--blue), var(--cyan), var(--green));
  transition: width 0.6s var(--ease);
}
.brief-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 22px;
  max-width: 580px;
}
.brief-prev {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(16px, 1.4vw, 20px);
  line-height: 1.3;
  color: var(--muted);
  opacity: 0.7;
  min-height: 1.3em;
}
.brief-line {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 2.6vw, 40px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  text-transform: none;
  min-height: 2.3em;
}
.brief-line .ch { opacity: 0; animation: chIn 0.12s forwards; animation-delay: var(--d); }
@keyframes chIn { to { opacity: 1; } }
.brief-line.is-typing::after {
  content: "";
  display: inline-block;
  width: 0.45em;
  height: 1em;
  margin-left: 0.08em;
  background: var(--ink);
  vertical-align: -0.12em;
  animation: caret 1s steps(2) infinite;
}
@keyframes caret { 50% { opacity: 0; } }

.brief-content { display: grid; gap: 16px; }
.brief-content .chips .chip { font-size: 15px; padding: 12px 18px; }
.brief-content form { display: grid; gap: 14px; }
.brief-actions { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.brief-content .field textarea { min-height: 110px; }
.brief-content .field input:invalid:not(:placeholder-shown) { border-color: #D63637; }
.brief-error { font-size: 13px; color: #D63637; min-height: 1.2em; }

.brief-summary {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 20px;
  border-radius: var(--radius);
  background: var(--bg);
}
.brief-summary div { display: grid; grid-template-columns: 130px 1fr; gap: 12px; font-size: 15px; }
.brief-summary dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  padding-top: 3px;
}
.brief-summary dd { margin: 0; font-weight: 500; overflow-wrap: anywhere; }

.brief-quote { display: grid; gap: 14px; }
.brief-quote .brief-summary div { grid-template-columns: 1fr auto; }
.brief-quote-total {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  padding: 16px 20px;
  border-radius: var(--radius);
  background: var(--dark);
  color: #fff;
}
.brief-quote-total span { display: grid; gap: 2px; }
.brief-quote-total small { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; color: rgba(255, 255, 255, 0.6); }
.brief-quote-total b { font-size: 20px; font-family: var(--font-display); color: var(--green); }
.brief-quote-note { margin: 0; font-size: 14px; color: var(--muted); }
.brief-quote-note b { color: var(--ink); }

.brief-nav {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}
.brief-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
  transition: background 0.25s, border-color 0.25s, color 0.25s;
}
.brief-btn:hover { border-color: var(--ink); }
.brief-btn:disabled { opacity: 0.35; cursor: default; border-color: var(--line); }
.brief-btn[aria-pressed="false"] { color: var(--muted); }
.brief-btn svg { width: 16px; height: 16px; }
.brief-count { margin-left: auto; font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.12em; color: var(--muted); }

.brief-gate {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: grid;
  place-items: center;
  padding: var(--gutter);
  background: rgba(11, 15, 20, 0.72);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  transition: opacity 0.5s var(--ease), visibility 0s 0.5s;
}
.brief-gate.is-hidden { opacity: 0; visibility: hidden; }
.brief-gate-card {
  max-width: 540px;
  padding: clamp(28px, 4vw, 44px);
  border-radius: var(--radius-lg);
  background: var(--surface);
  color: var(--ink);
  display: grid;
  gap: 18px;
}
.brief-gate-card .eyebrow { margin-bottom: 0; }
.brief-gate-card h2 { font-size: clamp(30px, 3.4vw, 44px); }
.brief-gate-card p { color: var(--ink-2); }

@media (max-width: 1024px) {
  .brief { grid-template-columns: 1fr; grid-template-rows: 48dvh auto; }
  .brief-stage { min-height: 48dvh; }
  .brief-panel {
    min-height: auto;
    padding-top: 32px;
    border-radius: 24px 24px 0 0;
    margin-top: -24px;
    z-index: 1;
  }
  .brief-body { justify-content: flex-start; }
  .brief-status { bottom: 44px; }
}

@media (prefers-reduced-motion: reduce) {
  .brief-line .ch { animation: none; opacity: 1; }
  .brief-status i { animation: none; }
}