/* ==========================================================================
   comoFunciona.css — Page-specific styles for como-funciona.html
   Covers the interactive photovoltaic system flow, financial benefits,
   and FAQ sections.
   ========================================================================== */

/* ==========================================================================
   PAGE HERO
   ========================================================================== */

.cf-hero {
  background: linear-gradient(135deg, var(--color-secondary) 0%, #2a2a2a 100%);
  padding-top: calc(70px + var(--space-16));
  padding-bottom: var(--space-16);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cf-hero::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 60px;
  background-color: var(--color-background);
  clip-path: ellipse(60% 100% at 50% 100%);
}

.cf-hero__label {
  display: inline-block;
  background-color: rgba(61, 190, 90, 0.2);
  border: 1px solid rgba(61, 190, 90, 0.4);
  border-radius: var(--radius-full);
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-primary-light);
  margin-bottom: var(--space-5);
}

.cf-hero__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: var(--font-weight-bold);
  color: #ffffff;
  margin-bottom: var(--space-4);
  line-height: var(--line-height-tight);
}

.cf-hero__title span {
  color: var(--color-primary);
}

.cf-hero__subtitle {
  font-size: var(--font-size-lg);
  color: rgba(255, 255, 255, 0.72);
  max-width: 55ch;
  margin-inline: auto;
  line-height: var(--line-height-relaxed);
}

/* ==========================================================================
   FLOW SECTION — Interactive step-by-step diagram
   ========================================================================== */

.flow-section {
  background-color: var(--color-background);
  padding-block: var(--space-16);
}

.flow-section__header {
  text-align: center;
  margin-bottom: var(--space-12);
}

/* Flow diagram container */
.flow-diagram {
  display: flex;
  flex-direction: column;
  gap: 0;
  align-items: center;
  margin-bottom: var(--space-12);
}

@media (min-width: 900px) {
  .flow-diagram {
    flex-direction: row;
    align-items: stretch;
    justify-content: center;
    gap: 0;
  }
}

/* Individual flow step */
.flow-step {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  cursor: pointer;
  flex: 1;
  max-width: 180px;
}

@media (max-width: 899px) {
  .flow-step {
    max-width: 100%;
    width: 100%;
    flex-direction: row;
    gap: var(--space-4);
    max-width: 480px;
  }
}

.flow-step__node {
  width: 90px;
  height: 90px;
  border-radius: var(--radius-full);
  background-color: var(--color-surface);
  border: 3px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: var(--space-1);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  flex-shrink: 0;
  z-index: 2;
  position: relative;
}

.flow-step__node svg {
  color: var(--color-text-muted);
  transition: color var(--transition-base);
}

.flow-step:hover .flow-step__node,
.flow-step.active .flow-step__node {
  border-color: var(--color-primary);
  background-color: var(--color-primary);
  box-shadow:
    0 0 0 6px rgba(61, 190, 90, 0.2),
    var(--shadow-lg);
  transform: scale(1.08);
}

.flow-step:hover .flow-step__node svg,
.flow-step.active .flow-step__node svg {
  color: #ffffff;
}

.flow-step__label {
  font-family: var(--font-display);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-muted);
  text-align: center;
  margin-top: var(--space-3);
  transition: color var(--transition-base);
  padding-inline: var(--space-2);
  line-height: var(--line-height-tight);
}

@media (max-width: 899px) {
  .flow-step__label {
    margin-top: 0;
    text-align: left;
    font-size: var(--font-size-base);
  }
}

.flow-step:hover .flow-step__label,
.flow-step.active .flow-step__label {
  color: var(--color-primary-dark);
}

/* Connector between steps */
.flow-connector {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
  position: relative;
}

/* Desktop: horizontal connector */
@media (min-width: 900px) {
  .flow-connector {
    width: 40px;
    height: 90px;
    margin-top: 0;
  }

  .flow-connector__line {
    width: 100%;
    height: 3px;
    background: linear-gradient(
      90deg,
      var(--color-border) 0%,
      var(--color-primary) 50%,
      var(--color-border) 100%
    );
    position: relative;
    overflow: visible;
  }

  .flow-connector__particle {
    position: absolute;
    top: 50%;
    left: -6px;
    transform: translateY(-50%);
    width: 10px;
    height: 10px;
    background-color: var(--color-primary);
    border-radius: var(--radius-full);
    animation: flowRight 2s linear infinite;
  }
}

/* Mobile: vertical connector */
@media (max-width: 899px) {
  .flow-connector {
    width: 90px;
    height: 36px;
    flex-direction: column;
  }

  .flow-connector__line {
    width: 3px;
    height: 100%;
    background: linear-gradient(
      180deg,
      var(--color-border) 0%,
      var(--color-primary) 50%,
      var(--color-border) 100%
    );
  }

  .flow-connector__particle {
    position: absolute;
    left: 50%;
    top: -6px;
    transform: translateX(-50%);
    width: 10px;
    height: 10px;
    background-color: var(--color-primary);
    border-radius: var(--radius-full);
    animation: flowDown 2s linear infinite;
  }
}

@keyframes flowRight {
  from {
    left: -6px;
    opacity: 0;
  }
  20% {
    opacity: 1;
  }
  80% {
    opacity: 1;
  }
  to {
    left: calc(100% - 4px);
    opacity: 0;
  }
}

@keyframes flowDown {
  from {
    top: -6px;
    opacity: 0;
  }
  20% {
    opacity: 1;
  }
  80% {
    opacity: 1;
  }
  to {
    top: calc(100% - 4px);
    opacity: 0;
  }
}

/* Detail panel — shown when a step is active */
.flow-detail {
  background-color: var(--color-surface);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  padding: var(--space-8);
  box-shadow: var(--shadow-md);
  display: none;
  animation: fadeSlideUp 0.3s ease;
}

.flow-detail.visible {
  display: block;
}

@keyframes fadeSlideUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.flow-detail__header {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}

.flow-detail__icon {
  width: 56px;
  height: 56px;
  background-color: var(--color-primary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  flex-shrink: 0;
}

.flow-detail__title {
  font-family: var(--font-display);
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-secondary);
}

.flow-detail__body {
  color: var(--color-text-muted);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-5);
}

.flow-detail__facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-4);
}

.flow-detail__fact {
  background-color: rgba(61, 190, 90, 0.07);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  border-left: 3px solid var(--color-primary);
}

.flow-detail__fact-label {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary-dark);
  display: block;
  margin-bottom: var(--space-1);
}

.flow-detail__fact-value {
  font-size: var(--font-size-sm);
  color: var(--color-text);
}

/* ==========================================================================
   BENEFÍCIOS FINANCEIROS (Financial benefits)
   ========================================================================== */

.beneficios {
  background-color: var(--color-surface);
  padding-block: var(--space-16);
}

.beneficios__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  align-items: center;
}

@media (min-width: 900px) {
  .beneficios__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-12);
  }
}

.beneficios__subtitle {
  margin-bottom: 2rem;
  margin-inline: 0;
}

.beneficios__cards {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.beneficio-card {
  background-color: var(--color-background);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  display: flex;
  gap: var(--space-4);
  align-items: flex-start;
  border: 1px solid var(--color-border);
  transition:
    border-color var(--transition-base),
    box-shadow var(--transition-base);
}

.beneficio-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.beneficio-card__icon {
  width: 44px;
  height: 44px;
  background-color: rgba(61, 190, 90, 0.12);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  flex-shrink: 0;
}

.beneficio-card__title {
  font-family: var(--font-display);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-secondary);
  margin-bottom: var(--space-1);
}

.beneficio-card__text {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: var(--line-height-relaxed);
}

/* ROI visual panel */
.roi-panel {
  background: linear-gradient(135deg, var(--color-secondary) 0%, #2a2a2a 100%);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  color: #ffffff;
}

.roi-panel__title {
  font-family: var(--font-display);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-6);
  color: #ffffff;
}

.roi-bar-item {
  margin-bottom: var(--space-5);
}

.roi-bar-item__header {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--space-2);
}

.roi-bar-item__label {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.8);
}

.roi-bar-item__value {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary-light);
}

.roi-bar-track {
  height: 8px;
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.roi-bar-fill {
  height: 100%;
  background: linear-gradient(
    90deg,
    var(--color-primary),
    var(--color-primary-light)
  );
  border-radius: var(--radius-full);
  width: 0;
  transition: width 1.2s ease;
}

.roi-panel__note {
  margin-top: var(--space-5);
  padding-top: var(--space-4);
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  font-size: var(--font-size-xs);
  color: rgba(255, 255, 255, 0.5);
  line-height: var(--line-height-relaxed);
}

/* ==========================================================================
   FAQ SECTION
   ========================================================================== */

.faq-section {
  background-color: var(--color-background);
  padding-block: var(--space-16);
}

.faq-section__header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  max-width: 780px;
  margin-inline: auto;
}

.faq-item {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item.open {
  border-color: var(--color-primary);
}

.faq-item__question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-5) var(--space-6);
  cursor: pointer;
  user-select: none;
}

.faq-item__question-text {
  font-family: var(--font-display);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-secondary);
  line-height: var(--line-height-tight);
}

.faq-item.open .faq-item__question-text {
  color: var(--color-primary-dark);
}

.faq-item__icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  color: var(--color-text-muted);
  transition:
    transform var(--transition-base),
    color var(--transition-base);
}

.faq-item.open .faq-item__icon {
  transform: rotate(45deg);
  color: var(--color-primary);
}

.faq-item__answer {
  max-height: 0;
  overflow: hidden;
  transition:
    max-height var(--transition-slow),
    padding var(--transition-base);
  padding-inline: var(--space-6);
}

.faq-item.open .faq-item__answer {
  max-height: 400px;
  padding-bottom: var(--space-5);
}

.faq-item__answer-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: var(--line-height-relaxed);
}