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

html {
  scroll-behavior: smooth;
}

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

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

a {
  color: var(--color-primary);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

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

.container {
  width: min(100% - 2rem, var(--max-width));
  margin-inline: auto;
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 200;
  padding: 0.5rem 1rem;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-sm);
}

.skip-link:focus {
  top: 1rem;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background: color-mix(in srgb, var(--color-surface) 92%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 1rem;
}

.logo {
  display: flex;
  align-items: center;
  color: var(--color-text);
  text-decoration: none;
}

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

.logo-wordmark {
  display: block;
  height: 28px;
  width: auto;
}

@media (min-width: 640px) {
  .logo-wordmark {
    height: 32px;
  }
}

.nav-links {
  display: none;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--color-muted);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
}

.nav-links a:hover {
  color: var(--color-text);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-muted);
  cursor: pointer;
}

.theme-toggle:hover {
  color: var(--color-text);
  border-color: var(--color-muted);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
}

.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }

[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

[data-theme="light"] .theme-toggle .icon-sun { display: none; }
[data-theme="light"] .theme-toggle .icon-moon { display: block; }

@media (min-width: 768px) {
  .nav-links {
    display: flex;
  }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  color: #fff;
}

.btn-primary[aria-disabled="true"] {
  opacity: 0.7;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-muted);
  color: var(--color-text);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

/* Sections */
section {
  padding-block: 4rem;
}

.section-header {
  margin-bottom: 2.5rem;
  max-width: 42rem;
}

.section-header.centered {
  margin-inline: auto;
  text-align: center;
}

.section-label {
  display: inline-block;
  margin-bottom: 0.5rem;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-primary);
}

h1, h2, h3 {
  line-height: 1.2;
  font-weight: 650;
  margin: 0 0 0.75rem;
}

h1 {
  font-size: clamp(2rem, 5vw, 2.75rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.125rem;
}

.lead {
  font-size: 1.125rem;
  color: var(--color-muted);
  margin: 0;
}

/* Hero */
.hero {
  padding-block: 3rem 4rem;
}

.hero-grid {
  display: grid;
  gap: 3rem;
  align-items: center;
}

@media (min-width: 960px) {
  .hero-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.hero-tagline {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.hero-note {
  margin-top: 0.75rem;
  font-size: 0.875rem;
  color: var(--color-muted);
}

/* Device showcase — screenshots reais */
.device-showcase {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  width: 100%;
}

@media (max-width: 959px) {
  .device-showcase {
    max-width: 300px;
    margin-inline: auto;
  }
}

.device-flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  align-items: stretch;
}

@media (min-width: 640px) {
  .device-flow {
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
  }
}

.flow-step {
  display: flex;
  flex-direction: column;
  margin: 0;
  padding: 1rem 0.75rem 1.25rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.flow-step-label {
  flex-shrink: 0;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  min-height: 2.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-primary);
  margin: 0 0 0.875rem;
}

.phone-frame {
  margin-inline: auto;
  width: 100%;
  max-width: 220px;
  padding: 8px;
  background: linear-gradient(145deg, var(--color-surface) 0%, var(--color-primary-subtle) 100%);
  border: 2px solid #99d7d0;
  border-radius: 28px;
  box-shadow: var(--shadow-md);
}

.phone-frame img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 20px;
  vertical-align: middle;
}

@media (min-width: 960px) {
  .phone-frame {
    max-width: 200px;
  }
}

.laptop-mockup {
  width: 100%;
  max-width: 180px;
  margin-inline: auto;
  aspect-ratio: 16 / 10;
  background: var(--color-surface-elevated);
  border: 3px solid var(--color-border);
  border-radius: 8px 8px 0 0;
  padding: 6px;
  box-shadow: var(--shadow-md);
}

.laptop-screen {
  width: 100%;
  height: 100%;
  background: #fff;
  border-radius: 4px;
  padding: 6px;
  font-size: 0.5rem;
  font-family: ui-monospace, monospace;
  color: #333;
  overflow: hidden;
}

[data-theme="dark"] .laptop-screen {
  background: #0d1117;
  color: #c9d1d9;
}

.laptop-base {
  width: 110%;
  height: 8px;
  margin-left: -5%;
  background: var(--color-border);
  border-radius: 0 0 4px 4px;
}

.flow-arrow {
  display: none;
  color: var(--color-muted);
  font-size: 1.25rem;
}

@media (min-width: 640px) {
  .flow-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
  }
}

/* Problem */
.problem {
  background: var(--color-surface);
  border-block: 1px solid var(--color-border);
}

.problem-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

@media (min-width: 640px) {
  .problem-list {
    grid-template-columns: repeat(3, 1fr);
  }
}

.problem-item {
  padding: 1.25rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.problem-item strong {
  display: block;
  margin-bottom: 0.25rem;
}

/* Steps */
.steps {
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 640px) {
  .steps {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .steps {
    grid-template-columns: repeat(3, 1fr);
  }
}

.steps.cols-6 {
  /* install flow — 6 steps */
}

.hero-cta .btn[aria-disabled="true"] {
  opacity: 0.65;
  pointer-events: none;
  cursor: not-allowed;
}

.install-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

@media (min-width: 640px) {
  .install-flow {
    grid-template-columns: repeat(2, 1fr);
  }
}

.install-step {
  padding: 1.25rem 1.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.install-step strong {
  display: block;
  color: var(--color-primary);
  margin-bottom: 0.35rem;
}

.step {
  position: relative;
  padding: 1.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.step-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  margin-bottom: 1rem;
  font-weight: 700;
  font-size: 0.875rem;
  color: var(--color-primary);
  background: var(--color-primary-subtle);
  border-radius: 50%;
}

/* Cards grid */
.cards {
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 640px) {
  .cards {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .cards.cols-3 {
    grid-template-columns: repeat(3, 1fr);
  }

  .cards.cols-5 {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1100px) {
  .cards.cols-5 {
    grid-template-columns: repeat(5, 1fr);
  }
}

.card {
  padding: 1.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: box-shadow 0.15s;
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card-icon {
  width: 40px;
  height: 40px;
  margin-bottom: 1rem;
  color: var(--color-primary);
}

/* Callout */
.callout {
  padding: 1.5rem 1.75rem;
  background: var(--color-tertiary-subtle);
  border: 1px solid color-mix(in srgb, var(--color-tertiary) 30%, transparent);
  border-radius: var(--radius);
  margin-top: 2rem;
}

.callout p {
  margin: 0;
}

.callout strong {
  color: var(--color-tertiary);
}

/* Research flow */
.research-flow {
  background: var(--color-surface);
  border-block: 1px solid var(--color-border);
}

.research-grid {
  display: grid;
  gap: 2rem;
  align-items: start;
}

@media (min-width: 960px) {
  .research-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.research-steps {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.research-steps li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--color-bg);
  border-radius: var(--radius-sm);
}

.research-steps .badge {
  flex-shrink: 0;
  padding: 0.125rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--color-primary-subtle);
  color: var(--color-primary);
  border-radius: 4px;
}

/* Privacy */
.privacy-box {
  padding: 2rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.privacy-list {
  margin: 1rem 0 0;
  padding-left: 1.25rem;
  color: var(--color-muted);
}

/* Stack line */
.stack-line {
  text-align: center;
  padding: 2rem;
  font-size: 0.9375rem;
  color: var(--color-muted);
  border-top: 1px solid var(--color-border);
}

.stack-line span {
  color: var(--color-text);
  font-weight: 500;
}

/* Roadmap */
.roadmap-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

@media (min-width: 640px) {
  .roadmap-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

.roadmap-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.roadmap-item::before {
  content: "";
  flex-shrink: 0;
  width: 8px;
  height: 8px;
  margin-top: 0.45rem;
  background: var(--color-primary);
  border-radius: 50%;
}

/* FAQ */
.faq {
  background: var(--color-surface);
  border-block: 1px solid var(--color-border);
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-width: 48rem;
  margin-inline: auto;
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
}

.faq-item summary {
  padding: 1rem 1.25rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--color-muted);
  transition: transform 0.15s;
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-answer {
  padding: 0 1.25rem 1rem;
  color: var(--color-muted);
}

.faq-answer p {
  margin: 0;
}

/* CTA final */
.cta-final {
  text-align: center;
  padding-block: 5rem;
}

.cta-final .hero-cta {
  justify-content: center;
}

/* Footer */
.site-footer {
  padding: 2rem 0;
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  text-align: center;
}

@media (min-width: 640px) {
  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer-meta {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin: 0;
}

.footer-links {
  display: flex;
  gap: 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--color-muted);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--color-text);
}

.mvp-badge {
  display: inline-block;
  padding: 0.2rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-subtle);
  border-radius: 4px;
}