/* halo · briefing CDC — cuestionario
   Reusa los tokens de styles.css. Carga después. */

html, body { height: 100%; }

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ───────── header ───────── */

.brief-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: var(--bg);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease);
}
.brief-header.scrolled { border-bottom-color: var(--line); }
.brief-header-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  height: 64px;
}
.brief-brand {
  display: flex;
  align-items: center;
  text-decoration: none;
  color: var(--fg);
}
.brief-progress {
  display: flex;
  align-items: center;
  gap: 12px;
  justify-self: center;
  color: var(--fg-muted);
  font-size: 12px;
  letter-spacing: 0.06em;
}
.brief-progress-bar {
  width: 160px;
  height: 2px;
  background: var(--line);
  border-radius: 999px;
  overflow: hidden;
}
.brief-progress-fill {
  height: 100%;
  width: 0%;
  background: var(--accent);
  border-radius: 999px;
  transition: width 0.45s var(--ease);
}
.brief-close {
  justify-self: end;
  background: transparent;
  border: 0;
  cursor: pointer;
  color: var(--fg-muted);
  padding: 8px;
  display: flex;
  align-items: center;
  transition: color var(--dur) var(--ease);
  font-family: inherit;
  font-size: 14px;
}
.brief-close:hover { color: var(--fg); }
.brief-close svg { width: 18px; height: 18px; }

/* ───────── main ───────── */

.brief-main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 64px 32px 120px;
}

.brief-step {
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.45s var(--ease), transform 0.45s var(--ease);
  pointer-events: none;
  position: absolute;
  inset: 0;
}
.brief-step[data-step="welcome"],
.brief-step[data-step="thanks"] {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
}
.brief-step.is-active {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
  position: relative;
}
.brief-stage {
  position: relative;
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
}

.step-eyebrow {
  display: block;
  margin-bottom: 16px;
  color: var(--fg-muted);
}
.step-question {
  margin-bottom: 12px;
  letter-spacing: -0.025em;
}
.step-hint {
  color: var(--fg-muted);
  margin-bottom: 32px;
}

/* ───────── inputs ───────── */

.brief-input {
  width: 100%;
  background: transparent;
  border: 0;
  border-bottom: 1.5px solid var(--line);
  padding: 14px 0;
  font-family: inherit;
  font-size: 24px;
  font-weight: 500;
  color: var(--fg);
  letter-spacing: -0.02em;
  transition: border-color var(--dur) var(--ease);
  outline: 0;
}
.brief-input::placeholder { color: var(--fg-muted); opacity: 0.55; }
.brief-input:focus { border-bottom-color: var(--accent); }

.brief-textarea {
  width: 100%;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 18px 20px;
  font-family: inherit;
  font-size: 16px;
  line-height: 1.5;
  color: var(--fg);
  min-height: 140px;
  resize: vertical;
  outline: 0;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.brief-textarea::placeholder { color: var(--fg-muted); opacity: 0.7; }
.brief-textarea:focus {
  border-color: var(--halo-charcoal-200);
  background: rgba(35,61,77,0.03);
}
[data-key="dark"] .brief-textarea:focus {
  background: rgba(237,228,211,0.04);
}

/* radio group */
.brief-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.brief-option {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: transparent;
  font-family: inherit;
  font-size: 16px;
  color: var(--fg);
  cursor: pointer;
  text-align: left;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.brief-option:hover { border-color: var(--halo-charcoal-200); }
.brief-option .check {
  width: 22px;
  height: 22px;
  border-radius: 999px;
  border: 1.5px solid var(--line);
  display: grid;
  place-items: center;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
  flex-shrink: 0;
}
.brief-option .check svg { width: 14px; height: 14px; opacity: 0; transition: opacity var(--dur-fast) var(--ease); color: #fff; }
.brief-option.is-selected {
  border-color: var(--accent);
  background: rgba(254,127,45,0.06);
}
.brief-option.is-selected .check {
  border-color: var(--accent);
  background: var(--accent);
}
.brief-option.is-selected .check svg { opacity: 1; color: #fff; }

.brief-tip {
  margin-top: 28px;
  font-size: 12px;
  color: var(--fg-muted);
  letter-spacing: 0.02em;
}
.brief-tip kbd {
  display: inline-block;
  padding: 2px 6px;
  border: 1px solid var(--line);
  border-radius: 4px;
  font-size: 11px;
  font-family: 'SF Mono', ui-monospace, monospace;
  background: rgba(35,61,77,0.05);
}
[data-key="dark"] .brief-tip kbd { background: rgba(237,228,211,0.06); }

/* ───────── welcome / thanks ambient ───────── */

.welcome-ambient {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

/* ───────── welcome ───────── */

.welcome {
  text-align: left;
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
}
.welcome-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--fg-muted);
  margin-bottom: 40px;
}
.welcome-eyebrow .dot {
  width: 6px; height: 6px; border-radius: 999px; background: var(--accent);
}
.welcome h1 {
  font-size: var(--display-size);
  line-height: 0.95;
  letter-spacing: -0.05em;
  font-weight: 500;
  margin: 0 0 32px;
  max-width: 12ch;
}
.welcome h1 em {
  font-style: italic;
  color: var(--accent);
  font-weight: 500;
}
.welcome p {
  color: var(--fg-muted);
  font-size: 18px;
  line-height: 1.6;
  max-width: 56ch;
  margin: 0;
}
.welcome p + p { margin-top: 20px; }

/* ───────── thanks ───────── */

.thanks {
  text-align: center;
  position: relative;
  z-index: 1;
}
.thanks-mark {
  display: inline-grid;
  place-items: center;
  margin: 0 auto 24px;
  color: var(--fg);
}
.thanks-mark svg { width: 64px; height: 64px; }
.thanks h1 {
  font-size: var(--display-size);
  line-height: 0.95;
  letter-spacing: -0.05em;
  font-weight: 500;
  margin: 0 0 24px;
}
.thanks h1 em { font-style: italic; color: var(--accent); font-weight: 500; }
.thanks p {
  color: var(--fg-muted);
  font-size: 18px;
  line-height: 1.55;
  max-width: 480px;
  margin: 0 auto 32px;
}
.thanks p strong { color: var(--fg); font-weight: 500; }
.thanks-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--fg-muted);
  text-decoration: none;
  font-size: 14px;
  transition: color var(--dur) var(--ease);
}
.thanks-back:hover { color: var(--fg); }

/* ───────── footer ───────── */

.brief-footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg);
  border-top: 1px solid var(--line);
  z-index: 30;
}
.brief-footer.is-hidden { display: none; }
.brief-footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 16px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.btn-back {
  background: transparent;
  border: 0;
  color: var(--fg-muted);
  font-family: inherit;
  font-size: 14px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 0;
  transition: color var(--dur) var(--ease);
}
.btn-back:hover { color: var(--fg); }
.btn-back:disabled { opacity: 0.3; cursor: not-allowed; }
.btn-back svg { width: 16px; height: 16px; }

.brief-error {
  font-size: 13px;
  color: var(--halo-pumpkin-600);
  margin-right: 12px;
  text-align: right;
}

.btn-next {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: var(--r);
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  background: var(--halo-pumpkin);
  color: #fff;
  border: 0;
  cursor: pointer;
  transition: background var(--dur) var(--ease);
}
.btn-next:hover { background: var(--halo-pumpkin-600); }
.btn-next:disabled { opacity: 0.6; cursor: not-allowed; }
.btn-next svg { width: 16px; height: 16px; transition: transform var(--dur) var(--ease); }
.btn-next:hover:not(:disabled) svg { transform: translateX(3px); }

/* ───────── responsive ───────── */

@media (max-width: 720px) {
  .welcome h1, .thanks h1 { font-size: 44px; }
  .step-question { font-size: 26px; }
  .brief-input { font-size: 20px; }
  .brief-progress-bar { width: 100px; }
  .brief-progress span { display: none; }
  .brief-main { padding: 48px 20px 140px; }
  .brief-footer-inner { padding: 14px 20px; }
  .brief-error { display: none; }
}