.brief-body {
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-display: 'Inter', var(--font-sans);
  --bg-dark: #0A0A0F;
  --bg-surface: #111118;
  --bg-surface-hover: #1A1A28;
  --border-glass: rgba(255, 255, 255, 0.08);
  --primary-glow: linear-gradient(135deg, #6C5CE7 0%, #5A4BD1 100%);
  --primary-color: #6C5CE7;
  --primary-light: #7C6FF7;
  --accent-cyan: #6C5CE7;
  --accent-pink: #E54D4D;
  --text-primary: #EDEDF5;
  --text-secondary: #B8B8CC;
  --text-muted: #8888A0;
  --transition-bounce: all 0.18s ease;
  --shadow-neon: 0 4px 16px rgba(108, 92, 231, 0.15);
  --shadow-neon-hover: 0 8px 24px rgba(108, 92, 231, 0.25);
}

* {
  box-sizing: border-box;
}

.brief-body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg-dark);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
}

.brief-body .grid-bg,
.brief-body .noise-overlay {
  display: none;
}

.brief-body h1,
.brief-body h2,
.brief-body h3,
.brief-body label,
.brief-body .logo-text,
.brief-body .brief-kicker {
  font-family: var(--font-display);
}

.app-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--border-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.header-container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.logo-area {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.logo-icon {
  width: 34px;
  height: 34px;
  display: inline-grid;
  place-items: center;
  border-radius: 8px;
  background: var(--primary-glow);
  color: #ffffff;
  font-size: 0.82rem;
  font-weight: 800;
}

.logo-text {
  color: var(--text-primary);
  font-size: 1.18rem;
  font-weight: 800;
}

.logo-text span {
  color: var(--accent-cyan);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 40px;
  padding: 10px 16px;
  border: 1px solid transparent;
  border-radius: 8px;
  color: inherit;
  font: 700 0.92rem var(--font-sans);
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition-bounce);
}

.btn-primary {
  background: var(--primary-glow);
  color: #ffffff;
  box-shadow: var(--shadow-neon);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-neon-hover);
}

.btn-secondary {
  background: var(--bg-surface);
  color: var(--text-primary);
  border-color: var(--border-glass);
}

.btn-secondary:hover {
  background: var(--bg-surface-hover);
  border-color: rgba(255, 255, 255, 0.15);
}

.brief-logo {
  color: inherit;
  text-decoration: none;
}

.brief-shell {
  max-width: 1240px;
  margin: 0 auto;
  padding: 40px 24px 72px;
}

.brief-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 28px;
}

.brief-heading h1 {
  margin: 8px 0 10px;
  font-size: clamp(1.8rem, 4vw, 3rem);
  line-height: 1.06;
}

.brief-heading p {
  color: var(--text-primary);
  opacity: 0.75;
  max-width: 760px;
  font-size: 1.05rem;
}

.brief-kicker {
  color: var(--primary-light);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.brief-status {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  flex: 0 0 auto;
  padding: 9px 12px;
  border: 1px solid var(--border-glass);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 600;
}

.status-dot {
  width: 9px;
  height: 9px;
  border-radius: 999px;
  background: var(--accent-cyan);
  box-shadow: 0 0 16px rgba(16, 185, 129, 0.55);
}

.brief-status.is-loading .status-dot {
  background: var(--primary-light);
  box-shadow: 0 0 16px rgba(252, 211, 77, 0.55);
}

.brief-status.is-error .status-dot {
  background: var(--accent-pink);
  box-shadow: 0 0 16px rgba(244, 63, 94, 0.55);
}

.brief-workspace {
  display: grid;
  grid-template-columns: minmax(320px, 460px) minmax(0, 1fr);
  gap: 20px;
  align-items: start;
}

.brief-panel {
  border: 1px solid var(--border-glass);
  border-radius: 10px;
  background: var(--bg-surface);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.brief-form {
  padding: 24px;
  display: grid;
  gap: 22px;
}

.field-group {
  display: grid;
  gap: 10px;
}

.field-group label {
  color: var(--text-primary);
  font-size: 0.88rem;
  font-weight: 600;
}

.field-group input::placeholder,
.field-group textarea::placeholder {
  color: var(--text-muted);
  opacity: 0.7;
}

.field-group input,
.field-group textarea,
.field-group select {
  width: 100%;
  border: 1px solid var(--border-glass);
  border-radius: 8px;
  background: var(--bg-dark);
  color: var(--text-primary);
  font: inherit;
  outline: none;
  padding: 12px 13px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.field-group input::placeholder,
.field-group textarea::placeholder {
  color: var(--text-muted);
}

.field-group textarea {
  resize: vertical;
  min-height: 118px;
}

.field-group input:focus,
.field-group textarea:focus,
.field-group select:focus {
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.15);
}

.brief-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.field-group.compact {
  min-width: 0;
}

.form-actions,
.output-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.form-actions .btn,
.output-header .btn {
  border-radius: 8px;
}

.brief-output-panel {
  min-height: 620px;
  padding: 20px;
}

.empty-state[hidden],
.brief-result[hidden],
.evidence-strip[hidden],
.output-meta[hidden] {
  display: none !important;
}

.output-header {
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-glass);
}

.output-header h2 {
  margin-top: 4px;
  font-size: 1.35rem;
}

.output-meta {
  margin-top: 14px;
  padding: 9px 11px;
  border: 1px solid rgba(16, 185, 129, 0.2);
  border-radius: 8px;
  background: rgba(16, 185, 129, 0.07);
  color: var(--text-secondary);
  font-size: 0.86rem;
  font-weight: 700;
}

.empty-state {
  min-height: 380px;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 10px;
  color: var(--text-muted);
  text-align: center;
  padding: 40px 24px;
}

.empty-state::before {
  content: '';
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(108, 92, 231, 0.1);
  margin-bottom: 4px;
}

.empty-state strong {
  color: var(--text-primary);
  font-size: 1.05rem;
  font-weight: 700;
}

.empty-state span {
  max-width: 340px;
  font-size: 0.88rem;
  line-height: 1.5;
}

.brief-result {
  padding: 22px 0 6px;
  color: var(--text-primary);
}

.brief-result h2,
.brief-result h3 {
  margin: 22px 0 10px;
  color: var(--text-primary);
  font-size: 1.12rem;
}

.brief-result h2:first-child,
.brief-result h3:first-child {
  margin-top: 0;
}

.brief-result p {
  margin: 0 0 12px;
  color: var(--text-secondary);
}

.brief-result ul,
.brief-result ol {
  margin: 8px 0 16px 22px;
  color: var(--text-secondary);
}

.brief-result li {
  margin: 7px 0;
}

.brief-result code {
  padding: 2px 5px;
  border-radius: 5px;
  background: rgba(255, 255, 255, 0.08);
}

.brief-result strong {
  color: var(--text-primary);
  font-weight: 800;
}

.evidence-strip {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--border-glass);
}

.evidence-title {
  margin-bottom: 10px;
  color: var(--accent-cyan);
  font-weight: 800;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.evidence-list {
  display: grid;
  gap: 10px;
}

.evidence-item {
  border: 1px solid var(--border-glass);
  border-radius: 8px;
  padding: 11px 12px;
  background: #f8fafc;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.evidence-item strong {
  display: block;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.brief-loader {
  min-height: 460px;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 22px;
  padding: 26px 8px 10px;
  text-align: center;
}

.brief-loader-orbit {
  position: relative;
  width: 118px;
  height: 118px;
  border-radius: 999px;
  background:
    radial-gradient(circle at center, #ffffff 0 42%, transparent 43%),
    conic-gradient(from 180deg, #2563eb, #0f766e, #f59e0b, #2563eb);
  box-shadow: 0 24px 60px rgba(37, 99, 235, 0.22);
  animation: brief-spin 2.4s linear infinite;
}

.brief-loader-orbit::before {
  content: "";
  position: absolute;
  inset: 17px;
  border-radius: inherit;
  border: 1px solid rgba(15, 23, 42, 0.12);
  background: #ffffff;
}

.brief-loader-orbit span {
  position: absolute;
  width: 15px;
  height: 15px;
  border-radius: 999px;
  background: #ffffff;
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.18);
}

.brief-loader-orbit span:nth-child(1) {
  top: 4px;
  left: 50%;
  transform: translateX(-50%);
}

.brief-loader-orbit span:nth-child(2) {
  right: 10px;
  bottom: 20px;
}

.brief-loader-orbit span:nth-child(3) {
  left: 10px;
  bottom: 20px;
}

.brief-loader-copy {
  max-width: 520px;
}

.brief-loader-copy strong {
  display: block;
  margin-top: 6px;
  color: #0f172a;
  font: 800 1.35rem var(--font-display);
}

.brief-loader-copy p {
  margin: 7px 0 0;
  color: #475569;
  font-weight: 700;
}

.brief-loader-steps {
  width: min(100%, 560px);
  display: grid;
  gap: 8px;
}

.brief-loader-step {
  display: grid;
  grid-template-columns: 30px 1fr;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid rgba(15, 23, 42, 0.1);
  border-radius: 8px;
  background: #f8fafc;
  color: #64748b;
  text-align: left;
  transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.brief-loader-step span {
  width: 30px;
  height: 30px;
  display: inline-grid;
  place-items: center;
  border-radius: 999px;
  background: #e2e8f0;
  color: #475569;
  font-size: 0.82rem;
  font-weight: 800;
}

.brief-loader-step em {
  font-style: normal;
  font-weight: 800;
}

.brief-loader-step.is-active {
  border-color: rgba(15, 118, 110, 0.45);
  background: rgba(15, 118, 110, 0.08);
  color: #0f172a;
  transform: translateY(-1px);
}

.brief-loader-step.is-active span {
  background: linear-gradient(135deg, #2563eb, #0f766e);
  color: #ffffff;
}

.brief-loader-step.is-done span {
  background: #0f766e;
  color: #ffffff;
}

.brief-loader-lines {
  width: min(100%, 380px);
  display: grid;
  gap: 8px;
}

.brief-loader-lines span {
  height: 8px;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(37, 99, 235, 0.18), rgba(15, 118, 110, 0.65), rgba(245, 158, 11, 0.18));
  background-size: 220% 100%;
  animation: brief-shimmer 1.4s ease-in-out infinite;
}

.brief-loader-lines span:nth-child(2) {
  width: 84%;
  margin: 0 auto;
  animation-delay: 0.12s;
}

.brief-loader-lines span:nth-child(3) {
  width: 68%;
  margin: 0 auto;
  animation-delay: 0.24s;
}

@keyframes brief-spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes brief-shimmer {
  0% {
    background-position: 0% 50%;
    opacity: 0.55;
  }

  50% {
    opacity: 1;
  }

  100% {
    background-position: 100% 50%;
    opacity: 0.55;
  }
}

@media (max-width: 900px) {
  .brief-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  .brief-workspace {
    grid-template-columns: 1fr;
  }

  .brief-output-panel {
    min-height: 520px;
  }
}

@media (max-width: 560px) {
  .brief-shell {
    padding: 28px 16px 56px;
  }

  .brief-controls,
  .form-actions,
  .output-header {
    grid-template-columns: 1fr;
  }

  .form-actions,
  .output-header {
    align-items: stretch;
    flex-direction: column;
  }
}