/* ==========================================================================
   IBPLD Design System — Digital Intelligence + Institucional Premium
   Mobile-first. Tokens + componentes essenciais.
   ========================================================================== */

:root {
  /* Palette */
  --paper: #F7F6F2;
  --white: #FFFFFF;
  --ink: #161719;
  --graphite: #25282C;
  --soft-ink: #64696F;
  --wine: #4C0911;
  --wine-signal: #76323B;
  --champagne: #C8B69A;
  --champagne-light: #E8E0D4;
  --steel: #74808A;

  /* Derived */
  --thread: rgba(200, 182, 154, 0.55);
  --thread-dark: rgba(200, 182, 154, 0.28);
  --thread-light: rgba(116, 128, 138, 0.35);
  --surface-elevated: var(--white);
  --focus-ring: rgba(76, 9, 17, 0.45);

  /* Typography */
  --font-sans: "Manrope", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-serif: "Instrument Serif", Georgia, "Times New Roman", serif;

  /* Spacing scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 5.5rem;
  --space-10: 7.5rem;

  /* Layout */
  --container: 72rem;
  --container-narrow: 42rem;
  --gutter: 1.25rem;
  --header-h: 4rem;

  /* Motion */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --t-micro: 200ms;
  --t-hover: 250ms;
  --t-enter: 600ms;
  --t-compose: 900ms;
  --t-ambient: 16s;

  /* Radius */
  --radius-sm: 2px;
  --radius-md: 4px;
}

/* --------------------------------------------------------------------------
   Base
   -------------------------------------------------------------------------- */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

a:hover {
  color: var(--wine);
}

:focus-visible {
  outline: 2px solid var(--wine);
  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;
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--narrow {
  max-width: var(--container-narrow);
}

@media (min-width: 768px) {
  :root {
    --gutter: 2rem;
    --header-h: 4.5rem;
  }
}

@media (min-width: 1440px) {
  :root {
    --gutter: 2.5rem;
  }
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */

.h1,
.h2,
.h3 {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.12;
  color: var(--ink);
}

.h1 {
  font-size: clamp(2rem, 6.5vw, 2.75rem);
}

.h2 {
  font-size: clamp(1.75rem, 5vw, 2.5rem);
}

.h3 {
  font-size: clamp(1.25rem, 3vw, 1.5rem);
}

.lead {
  margin: 0;
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--soft-ink);
  max-width: 36rem;
}

.editorial {
  font-family: var(--font-serif);
  font-weight: 400;
  letter-spacing: -0.01em;
  line-height: 1.35;
}

.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 var(--space-4);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel);
}

.section-kicker::before {
  content: "";
  width: 1.25rem;
  height: 1px;
  background: var(--champagne);
}

/* --------------------------------------------------------------------------
   Buttons & links
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0.75rem 1.25rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition:
    background-color var(--t-hover) var(--ease-out),
    color var(--t-hover) var(--ease-out),
    border-color var(--t-hover) var(--ease-out),
    transform var(--t-hover) var(--ease-out);
}

.btn:hover {
  color: inherit;
}

.btn--primary {
  background: var(--wine);
  color: var(--paper);
  border-color: var(--wine);
}

.btn--primary:hover {
  background: var(--wine-signal);
  border-color: var(--wine-signal);
  color: var(--paper);
}

.btn--ghost {
  background: transparent;
  color: var(--ink);
  border-color: rgba(22, 23, 25, 0.18);
}

.btn--ghost:hover {
  border-color: var(--ink);
  color: var(--ink);
}

.btn--on-dark {
  color: var(--paper);
  border-color: rgba(247, 246, 242, 0.28);
}

.btn--on-dark:hover {
  border-color: var(--champagne);
  color: var(--paper);
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  min-height: 44px;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--wine);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.text-link::after {
  content: "→";
  transition: transform var(--t-hover) var(--ease-out);
}

.text-link:hover {
  color: var(--wine-signal);
}

.text-link:hover::after {
  transform: translateX(3px);
}

/* --------------------------------------------------------------------------
   Evidence Label
   -------------------------------------------------------------------------- */

.evidence-label {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.55rem;
  border: 1px solid rgba(200, 182, 154, 0.55);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.55);
  color: var(--graphite);
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  line-height: 1;
  white-space: nowrap;
}

.evidence-label--dark {
  background: rgba(37, 40, 44, 0.55);
  border-color: rgba(200, 182, 154, 0.35);
  color: var(--champagne-light);
}

.evidence-label__sep {
  color: var(--champagne);
  font-weight: 500;
}

/* --------------------------------------------------------------------------
   Risk Node
   -------------------------------------------------------------------------- */

.risk-node {
  --node-size: 10px;
  position: relative;
  display: inline-grid;
  place-items: center;
  width: 1.5rem;
  height: 1.5rem;
  flex-shrink: 0;
}

.risk-node::before {
  content: "";
  width: var(--node-size);
  height: var(--node-size);
  border: 1px solid var(--champagne);
  border-radius: 50%;
  opacity: 0.85;
}

.risk-node::after {
  content: "";
  position: absolute;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--wine);
}

.risk-node--muted::before {
  border-color: var(--steel);
}

.risk-node--muted::after {
  background: var(--champagne);
}

.risk-node--on-dark::before {
  border-color: rgba(200, 182, 154, 0.7);
}

.risk-node--pulse::after {
  animation: node-pulse var(--t-ambient) var(--ease-out) infinite;
}

@keyframes node-pulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.35);
    opacity: 0.65;
  }
}

/* --------------------------------------------------------------------------
   Intelligence Thread
   -------------------------------------------------------------------------- */

.intel-thread {
  position: relative;
}

.intel-thread__line {
  position: absolute;
  background: var(--thread);
  transform-origin: top center;
}

.intel-thread__line--v {
  top: 0;
  bottom: 0;
  left: 0.7rem;
  width: 1px;
}

.intel-thread__line--h {
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
}

.intel-thread__line.is-draw {
  transform: scaleY(0);
}

.intel-thread__line.is-draw.is-visible {
  transform: scaleY(1);
  transition: transform var(--t-compose) var(--ease-out);
}

/* --------------------------------------------------------------------------
   Surfaces
   -------------------------------------------------------------------------- */

.surface-paper {
  background: var(--paper);
  color: var(--ink);
}

.surface-dark {
  background: var(--graphite);
  color: var(--paper);
}

.surface-dark .h1,
.surface-dark .h2,
.surface-dark .h3 {
  color: var(--paper);
}

.surface-dark .lead,
.surface-dark .soft {
  color: rgba(247, 246, 242, 0.72);
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  background: rgba(247, 246, 242, 0.88);
  border-bottom: 1px solid rgba(22, 23, 25, 0.06);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: var(--space-4);
}

.site-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  min-height: 44px;
  text-decoration: none;
  color: var(--ink);
}

.site-logo:hover {
  color: var(--ink);
}

.site-logo__mark {
  width: 7.5rem;
  height: auto;
}

.site-logo__tag {
  display: none;
  max-width: 11rem;
  font-size: 0.625rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  line-height: 1.3;
  color: var(--soft-ink);
  text-transform: uppercase;
}

.site-nav {
  display: none;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0.5rem 0.7rem;
  font-size: 0.875rem;
  font-weight: 550;
  letter-spacing: -0.01em;
  color: var(--graphite);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: color var(--t-hover) var(--ease-out);
}

.site-nav__link:hover,
.site-nav__link[aria-current="page"] {
  color: var(--wine);
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.site-header__student {
  display: none;
  min-height: 40px;
  padding: 0.5rem 0.85rem;
  border: 1px solid rgba(22, 23, 25, 0.14);
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--ink);
  transition:
    border-color var(--t-hover) var(--ease-out),
    color var(--t-hover) var(--ease-out);
}

.site-header__student:hover {
  border-color: var(--wine);
  color: var(--wine);
}

.nav-toggle {
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid rgba(22, 23, 25, 0.12);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
}

.nav-toggle__bars {
  position: relative;
  width: 18px;
  height: 12px;
}

.nav-toggle__bars span {
  position: absolute;
  left: 0;
  right: 0;
  height: 1.5px;
  background: currentColor;
  transition:
    transform var(--t-micro) var(--ease-out),
    opacity var(--t-micro) var(--ease-out),
    top var(--t-micro) var(--ease-out);
}

.nav-toggle__bars span:nth-child(1) { top: 0; }
.nav-toggle__bars span:nth-child(2) { top: 5px; }
.nav-toggle__bars span:nth-child(3) { top: 10px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) {
  top: 5px;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) {
  top: 5px;
  transform: rotate(-45deg);
}

.mobile-nav {
  display: none;
  position: absolute;
  inset: var(--header-h) 0 auto 0;
  background: var(--paper);
  border-bottom: 1px solid rgba(22, 23, 25, 0.08);
  padding: var(--space-4) var(--gutter) var(--space-5);
}

.mobile-nav.is-open {
  display: block;
}

.mobile-nav__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.mobile-nav__link {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 0.35rem 0;
  border-bottom: 1px solid rgba(22, 23, 25, 0.06);
  font-size: 1.0625rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--ink);
}

.mobile-nav__link:hover {
  color: var(--wine);
}

.mobile-nav__student {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 48px;
  margin-top: var(--space-4);
  border: 1px solid rgba(22, 23, 25, 0.16);
  border-radius: var(--radius-sm);
  font-weight: 600;
  text-decoration: none;
  color: var(--ink);
}

@media (min-width: 1024px) {
  .site-nav {
    display: block;
  }

  .site-header__student {
    display: inline-flex;
    align-items: center;
  }

  .nav-toggle,
  .mobile-nav {
    display: none !important;
  }

  .site-logo__tag {
    display: block;
  }
}

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */

.hero {
  position: relative;
  overflow: hidden;
  padding: var(--space-7) 0 var(--space-8);
  background:
    radial-gradient(120% 80% at 100% 0%, rgba(232, 224, 212, 0.55) 0%, transparent 55%),
    linear-gradient(180deg, var(--paper) 0%, #F3F1EB 100%);
}

.hero__grid {
  display: grid;
  gap: var(--space-7);
  align-items: center;
}

.hero__labels {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: var(--space-5);
}

.hero__title {
  margin: 0 0 var(--space-5);
  max-width: 14ch;
}

.hero__lead {
  margin: 0 0 var(--space-6);
}

.hero__actions {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0.75rem;
}

.hero__viz {
  position: relative;
  min-height: 16rem;
  border: 1px solid rgba(200, 182, 154, 0.35);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.65) 0%, rgba(247, 246, 242, 0.2) 100%);
  overflow: hidden;
}

.hero__viz-frame {
  position: absolute;
  inset: 1rem;
}

.hero__canvas {
  width: 100%;
  height: 100%;
  min-height: 14rem;
}

.hero__viz-caption {
  position: absolute;
  left: 1rem;
  right: 1rem;
  bottom: 1rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.625rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--steel);
}

.hero__viz-caption span:last-child {
  color: var(--wine-signal);
}

@media (min-width: 390px) {
  .hero {
    padding-top: var(--space-8);
  }
}

@media (min-width: 768px) {
  .hero__actions {
    flex-direction: row;
    align-items: center;
  }

  .hero__viz {
    min-height: 20rem;
  }
}

@media (min-width: 1024px) {
  .hero {
    padding: var(--space-9) 0 var(--space-10);
    min-height: calc(100svh - var(--header-h));
    display: flex;
    align-items: center;
  }

  .hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: var(--space-8);
  }

  .hero__title {
    font-size: clamp(2.75rem, 4.2vw, 3.75rem);
    max-width: 12ch;
  }

  .hero__viz {
    min-height: 28rem;
  }
}

@media (min-width: 1440px) {
  .hero__title {
    font-size: 4rem;
  }

  .hero__viz {
    min-height: 32rem;
  }
}

/* --------------------------------------------------------------------------
   Problem — Dobra 2
   -------------------------------------------------------------------------- */

.problem {
  position: relative;
  padding: var(--space-9) 0;
  overflow: hidden;
}

.problem__inner {
  position: relative;
  max-width: 40rem;
}

.problem__title {
  margin: 0 0 var(--space-7);
  max-width: 14ch;
}

.problem__thread {
  position: relative;
  padding-left: 2.25rem;
}

.problem__thread .intel-thread__line--v {
  left: 0.55rem;
  top: 0.55rem;
  bottom: 0.55rem;
  background: var(--thread-dark);
}

.problem__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: var(--space-6);
}

.problem__item {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.85rem;
  align-items: start;
}

.problem__item .risk-node {
  margin-left: -2.25rem;
}

.problem__text {
  margin: 0;
  font-size: 1.0625rem;
  line-height: 1.55;
  color: rgba(247, 246, 242, 0.78);
  max-width: 28rem;
}

.problem__item:first-child .problem__text {
  color: rgba(247, 246, 242, 0.92);
}

@media (min-width: 768px) {
  .problem {
    padding: var(--space-10) 0;
  }

  .problem__title {
    font-size: clamp(2.25rem, 4vw, 3rem);
    margin-bottom: var(--space-8);
  }

  .problem__text {
    font-size: 1.1875rem;
  }
}

@media (min-width: 1440px) {
  .problem__inner {
    margin-left: 8%;
  }
}

/* --------------------------------------------------------------------------
   Response — Dobra 3
   -------------------------------------------------------------------------- */

.response {
  padding: var(--space-9) 0 var(--space-10);
  position: relative;
}

.response__layout {
  display: grid;
  gap: var(--space-7);
}

.response__title {
  max-width: 16ch;
  margin: 0 0 var(--space-5);
}

.response__sequence {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
  border-top: 1px solid rgba(22, 23, 25, 0.08);
}

.response__step {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: var(--space-4);
  align-items: center;
  padding: 1.15rem 0;
  border-bottom: 1px solid rgba(22, 23, 25, 0.08);
}

.response__index {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--champagne);
}

.response__step-text {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 550;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.response__closing {
  margin: var(--space-7) 0 var(--space-5);
  max-width: 18ch;
  font-size: clamp(1.5rem, 4vw, 2rem);
  color: var(--ink);
}

.response__aside {
  position: relative;
  min-height: 12rem;
  padding: var(--space-5);
  border-left: 1px solid rgba(200, 182, 154, 0.55);
  background:
    linear-gradient(180deg, rgba(232, 224, 212, 0.28) 0%, transparent 70%);
}

.response__aside-label {
  margin-bottom: var(--space-5);
}

.response__aside-copy {
  margin: 0;
  max-width: 18rem;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--soft-ink);
}

.response__aside-meta {
  margin-top: var(--space-6);
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

@media (min-width: 768px) {
  .response__step-text {
    font-size: 1.25rem;
  }
}

@media (min-width: 1024px) {
  .response__layout {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: var(--space-9);
    align-items: start;
  }

  .response__aside {
    min-height: 22rem;
    padding: var(--space-6);
    margin-top: 2.5rem;
  }
}

/* --------------------------------------------------------------------------
   Motion — progressive enhancement
   -------------------------------------------------------------------------- */

[data-reveal] {
  opacity: 1;
  transform: none;
}

.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px) scale(0.985);
  transition:
    opacity var(--t-enter) var(--ease-out),
    transform var(--t-enter) var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
  will-change: opacity, transform;
}

.js [data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.js .problem__item[data-reveal] {
  transform: translateX(-10px);
}

.js .problem__item[data-reveal].is-visible {
  transform: translateX(0);
}

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

  .js [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }

  .intel-thread__line.is-draw {
    transform: none !important;
  }
}

/* --------------------------------------------------------------------------
   Page shell footer (minimal chrome — not narrative CTA)
   -------------------------------------------------------------------------- */

.site-end {
  border-top: 1px solid rgba(22, 23, 25, 0.08);
  padding: var(--space-5) 0;
}

.site-end__inner {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  color: var(--soft-ink);
}

.site-end a {
  text-decoration: none;
  font-weight: 600;
  color: var(--graphite);
}

.site-end a:hover {
  color: var(--wine);
}