/* ============================================================
   ZYNTOR — Design System (ElevenLabs-inspired)
   ============================================================ */

:root {
  /* Colors */
  --color-eggshell: #fdfcfc;
  --color-powder: #f5f3f1;
  --color-chalk: #e5e5e5;
  --color-fog: #b1b0b0;
  --color-gravel: #777169;
  --color-slate: #a59f97;
  --color-obsidian: #000000;
  --color-signal-blue: #0447ff;
  --color-ember: #ff4704;
  --color-white: #ffffff;

  /* Typography */
  --font-display: 'Cormorant Garamond', Georgia, 'Times New Roman', serif;
  --font-body: 'Inter', ui-sans-serif, system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;

  /* Type scale */
  --text-caption: 10px;
  --text-body: 14px;
  --text-body-lg: 16px;
  --text-subheading: 18px;
  --text-heading-sm: 20px;
  --text-heading: 32px;
  --text-heading-lg: 36px;
  --text-display: 48px;

  /* Spacing */
  --spacing-4: 4px;
  --spacing-8: 8px;
  --spacing-12: 12px;
  --spacing-16: 16px;
  --spacing-20: 20px;
  --spacing-24: 24px;
  --spacing-32: 32px;
  --spacing-40: 40px;
  --spacing-48: 48px;
  --spacing-56: 56px;
  --spacing-64: 64px;
  --spacing-80: 80px;
  --spacing-96: 96px;
  --spacing-120: 120px;

  /* Radii */
  --radius-full: 9999px;
  --radius-card: 16px;
  --radius-badge: 12px;
  --radius-input: 0px;

  /* Shadows */
  --shadow-card: rgba(0,0,0,0.4) 0px 0px 1.143px 0px, rgba(0,0,0,0.04) 0px 2px 4px 0px;
  --shadow-btn: rgba(0,0,0,0.06) 0px 0px 0px 1px, rgba(0,0,0,0.04) 0px 1px 2px 0px, rgba(0,0,0,0.04) 0px 2px 4px 0px;

  /* Layout */
  --max-width: 1200px;
}

/* ============================================================
   RESET & BASE
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background-color: var(--color-eggshell);
  color: var(--color-obsidian);
  font-family: var(--font-body);
  font-size: var(--text-body-lg);
  line-height: 1.5;
  letter-spacing: 0.1px;
  -webkit-font-smoothing: antialiased;
}

ul { list-style: none; }
a { text-decoration: none; color: inherit; }
img { display: block; max-width: 100%; }

/* ============================================================
   TYPOGRAPHY UTILITIES
   ============================================================ */

.display {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: var(--text-display);
  line-height: 1.08;
  letter-spacing: -0.96px;
  color: var(--color-obsidian);
}

.heading {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: var(--text-heading);
  line-height: 1.17;
  letter-spacing: -0.64px;
  color: var(--color-obsidian);
}

.heading-lg {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: var(--text-heading-lg);
  line-height: 1.13;
  letter-spacing: -0.72px;
  color: var(--color-obsidian);
}

.eyebrow {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: var(--text-body);
  color: var(--color-gravel);
  letter-spacing: 0.1px;
  margin-bottom: var(--spacing-12);
}

.eyebrow--center { text-align: center; }

/* ============================================================
   LAYOUT
   ============================================================ */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-32);
}

/* ============================================================
   BUTTONS
   ============================================================ */

.btn-fill,
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 36px;
  padding: 0 var(--spacing-16);
  border-radius: var(--radius-full);
  font-family: var(--font-body);
  font-weight: 500;
  font-size: var(--text-body);
  letter-spacing: 0.1px;
  line-height: 1;
  cursor: pointer;
  transition: opacity 0.15s ease;
  white-space: nowrap;
}

.btn-fill {
  background: var(--color-obsidian);
  color: var(--color-eggshell);
  border: 1px solid var(--color-obsidian);
  box-shadow: var(--shadow-btn);
}

.btn-fill:hover { opacity: 0.82; }

.btn-ghost {
  background: var(--color-white);
  color: var(--color-obsidian);
  border: 1px solid var(--color-chalk);
  box-shadow: var(--shadow-btn);
}

.btn-ghost:hover { background: var(--color-powder); }

/* ============================================================
   NAVIGATION
   ============================================================ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--color-eggshell);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  border-bottom: 1px solid transparent;
}

.nav--scrolled {
  border-bottom-color: var(--color-chalk);
  box-shadow: rgba(0,0,0,0.04) 0px 1px 4px;
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-32);
  height: 56px;
  display: flex;
  align-items: center;
  gap: var(--spacing-40);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-8);
  flex-shrink: 0;
}

.nav-logo-img {
  border-radius: 6px;
  display: block;
  flex-shrink: 0;
}

.nav-logo-word {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.7px;
  color: var(--color-obsidian);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-32);
  flex: 1;
}

.nav-links a {
  font-size: var(--text-body);
  font-weight: 400;
  color: var(--color-obsidian);
  letter-spacing: 0.1px;
  transition: color 0.15s ease;
}

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

.nav-ctas {
  display: flex;
  align-items: center;
  gap: var(--spacing-8);
  flex-shrink: 0;
}

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

.hero {
  padding-top: calc(56px + var(--spacing-96));
  padding-bottom: var(--spacing-96);
}

.hero-inner {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: var(--spacing-64);
  align-items: center;
}

.hero-left {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.hero-left .display {
  margin-bottom: var(--spacing-24);
}

.hero-body {
  font-size: var(--text-body-lg);
  color: var(--color-gravel);
  line-height: 1.5;
  max-width: 480px;
  margin-bottom: var(--spacing-32);
}

.hero-actions {
  display: flex;
  gap: var(--spacing-8);
  flex-wrap: wrap;
}

.hero-actions .btn-fill,
.hero-actions .btn-ghost {
  height: 40px;
  padding: 0 var(--spacing-20);
  font-size: 15px;
}

/* App card demo */
.app-card {
  background: var(--color-white);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: var(--spacing-20);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-16);
}

.app-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.app-card-label {
  font-size: 12px;
  font-weight: 500;
  color: var(--color-gravel);
  letter-spacing: 0.2px;
}

.app-card-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.dot-blue { background: #1a6b4a; }
.dot-orange { background: #1a6b4a; }

.app-stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-12);
}

.app-stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.app-stat-value {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: 22px;
  letter-spacing: -0.3px;
  color: var(--color-obsidian);
}

.app-stat-label {
  font-size: 11px;
  color: var(--color-gravel);
  line-height: 1.3;
}

.app-divider {
  height: 1px;
  background: var(--color-chalk);
}

.student-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.student-row {
  display: grid;
  grid-template-columns: 32px 1fr auto;
  align-items: center;
  gap: var(--spacing-12);
  padding: var(--spacing-8) var(--spacing-12);
  border-radius: 4px;
  transition: background 0.12s ease;
}

.student-row--active {
  background: var(--color-powder);
}

.student-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 500;
  flex-shrink: 0;
}

.student-name {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-obsidian);
}

.student-meta {
  font-size: 12px;
  color: var(--color-gravel);
  white-space: nowrap;
}

/* ============================================================
   NUMBERS / SOCIAL PROOF
   ============================================================ */

.numbers {
  border-top: 1px solid var(--color-chalk);
  border-bottom: 1px solid var(--color-chalk);
  padding: var(--spacing-56) 0;
}

.numbers-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-32);
}

.number-item {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-4);
  text-align: center;
}

.number-value {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: var(--text-heading-lg);
  letter-spacing: -0.72px;
  line-height: 1.1;
  color: var(--color-obsidian);
}

.number-label {
  font-size: var(--text-body);
  color: var(--color-gravel);
}

/* ============================================================
   FEATURES
   ============================================================ */

.features {
  padding: var(--spacing-96) 0;
}

.features .heading {
  max-width: 560px;
  margin-bottom: var(--spacing-56);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-48) var(--spacing-64);
}

.feature-block {
  display: grid;
  grid-template-columns: 8px 1fr;
  grid-template-rows: auto auto;
  column-gap: 10px;
  align-items: center;
}

.feature-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  grid-column: 1;
  grid-row: 1;
  align-self: center;
}

.feature-title {
  grid-column: 2;
  grid-row: 1;
}

.feature-body {
  grid-column: 2;
  grid-row: 2;
  margin-top: var(--spacing-4);
}


.feature-title {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: var(--text-body-lg);
  color: var(--color-obsidian);
}

.feature-body {
  font-size: var(--text-body);
  color: var(--color-gravel);
  line-height: 1.57;
}

/* ============================================================
   HOW IT WORKS
   ============================================================ */

.how {
  padding: var(--spacing-96) 0;
  border-top: 1px solid var(--color-chalk);
}

.how .heading {
  max-width: 480px;
  margin-bottom: var(--spacing-56);
}

.how-steps {
  display: flex;
  align-items: flex-start;
  gap: 0;
}

.how-step {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-12);
  padding: 0 var(--spacing-32);
}

.how-step:first-child { padding-left: 0; }
.how-step:last-child { padding-right: 0; }

.how-number {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: var(--text-heading);
  letter-spacing: -0.64px;
  color: var(--color-chalk);
  line-height: 1;
}

.how-title {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: var(--text-body-lg);
  color: var(--color-obsidian);
}

.how-body {
  font-size: var(--text-body);
  color: var(--color-gravel);
  line-height: 1.57;
}

.how-divider {
  width: 1px;
  height: 120px;
  background: var(--color-chalk);
  margin-top: var(--spacing-8);
  flex-shrink: 0;
}

/* ============================================================
   PLANS / PRICING
   ============================================================ */

.plans {
  padding: var(--spacing-96) 0;
  border-top: 1px solid var(--color-chalk);
}

.plans .heading {
  margin-bottom: var(--spacing-12);
}

.plans-sub {
  font-size: var(--text-body);
  color: var(--color-gravel);
  margin-bottom: var(--spacing-56);
}

/* Period toggle */
.period-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-4);
  background: var(--color-white);
  border: 1px solid var(--color-chalk);
  border-radius: var(--radius-full);
  padding: 4px;
  margin-bottom: var(--spacing-48);
  box-shadow: var(--shadow-btn);
}

.period-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-8);
  height: 32px;
  padding: 0 var(--spacing-16);
  border-radius: var(--radius-full);
  border: none;
  background: transparent;
  font-family: var(--font-body);
  font-size: var(--text-body);
  font-weight: 400;
  color: var(--color-gravel);
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
  white-space: nowrap;
}

.period-btn--active {
  background: var(--color-obsidian);
  color: var(--color-eggshell);
  font-weight: 500;
}

.period-save {
  font-size: 11px;
  color: var(--color-signal-blue);
  font-weight: 500;
}

.period-btn--active .period-save {
  color: rgba(255,255,255,0.6);
}

.plans-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--spacing-16);
  align-items: stretch;
}

.plan-card {
  background: var(--color-white);
  border: 1px solid var(--color-chalk);
  border-radius: var(--radius-card);
  padding: var(--spacing-24);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-24);
  box-shadow: rgba(0,0,0,0.075) 0px 0px 0px 0.5px inset;
  height: 100%;
}

.plan-card--featured {
  border-color: var(--color-obsidian);
  box-shadow: var(--shadow-card);
  position: relative;
}

.plan-header {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-8);
  flex: 1;
}

.plan-badge {
  display: inline-flex;
  align-items: center;
  height: 22px;
  padding: 0 var(--spacing-8);
  background: var(--color-obsidian);
  color: var(--color-eggshell);
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2px;
  width: fit-content;
  margin-bottom: var(--spacing-4);
}

.plan-name {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: var(--text-heading-sm);
  color: var(--color-obsidian);
}

.plan-price {
  display: flex;
  align-items: baseline;
  gap: var(--spacing-4);
}

.plan-amount {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: var(--text-heading-lg);
  letter-spacing: -0.72px;
  color: var(--color-obsidian);
}

.plan-period {
  font-size: var(--text-body);
  color: var(--color-gravel);
}

.plan-price-note {
  font-size: 12px;
  color: var(--color-slate);
  min-height: 16px;
  line-height: 1.4;
}

.plan-desc {
  font-size: var(--text-body);
  color: var(--color-gravel);
  line-height: 1.5;
}

.plans-disclaimer {
  margin-top: var(--spacing-32);
  font-size: var(--text-body);
  color: var(--color-gravel);
  text-align: center;
}

.plan-features {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-12);
  border-top: 1px solid var(--color-chalk);
  padding-top: var(--spacing-20);
}

.plan-features li {
  display: flex;
  align-items: center;
  gap: var(--spacing-8);
  font-size: var(--text-body);
  color: var(--color-gravel);
}

.plan-features li::before {
  content: '';
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 1px solid var(--color-chalk);
  background: var(--color-powder);
  flex-shrink: 0;
  position: relative;
}

.plan-features li::before {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 14 14'%3E%3Cpath d='M2.5 7L5.5 10L11.5 4' stroke='%23777169' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-size: contain;
  background-repeat: no-repeat;
  background-color: transparent;
  border: none;
}

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

.faq {
  padding: var(--spacing-96) 0;
  border-top: 1px solid var(--color-chalk);
}

.faq-inner {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--spacing-64);
  align-items: start;
}

.faq-sub {
  font-size: var(--text-body);
  color: var(--color-gravel);
  margin-top: var(--spacing-16);
  line-height: 1.57;
}

.link {
  color: var(--color-obsidian);
  border-bottom: 1px solid var(--color-chalk);
  transition: border-color 0.15s ease;
}

.link:hover { border-color: var(--color-obsidian); }

.faq-right {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.faq-item {
  border-bottom: 1px solid var(--color-chalk);
  cursor: pointer;
}

.faq-item:first-child { border-top: 1px solid var(--color-chalk); }

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-20) 0;
  font-size: var(--text-body-lg);
  font-weight: 500;
  color: var(--color-obsidian);
  list-style: none;
  cursor: pointer;
  user-select: none;
  gap: var(--spacing-16);
}

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

.faq-question::after {
  content: '+';
  font-size: 20px;
  font-weight: 300;
  color: var(--color-gravel);
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

details[open] .faq-question::after {
  content: '−';
}

.faq-answer {
  font-size: var(--text-body);
  color: var(--color-gravel);
  line-height: 1.6;
  padding-bottom: var(--spacing-20);
}

/* ============================================================
   CTA FINAL
   ============================================================ */

.cta-final {
  padding: var(--spacing-120) 0;
  border-top: 1px solid var(--color-chalk);
}

.cta-final-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0;
}

.cta-heading {
  max-width: 640px;
  margin-bottom: var(--spacing-20);
}

.cta-body {
  font-size: var(--text-body-lg);
  color: var(--color-gravel);
  margin-bottom: var(--spacing-32);
}

.cta-actions {
  display: flex;
  gap: var(--spacing-8);
  flex-wrap: wrap;
  justify-content: center;
}

.cta-actions .btn-fill,
.cta-actions .btn-ghost {
  height: 40px;
  padding: 0 var(--spacing-20);
  font-size: 15px;
}

/* ============================================================
   FOOTER
   ============================================================ */

.footer {
  border-top: 1px solid var(--color-chalk);
  padding: var(--spacing-40) 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  gap: var(--spacing-40);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-8);
  flex-shrink: 0;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-24);
  flex: 1;
}

.footer-links a {
  font-size: var(--text-body);
  color: var(--color-gravel);
  transition: color 0.15s ease;
}

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

.footer-copy {
  font-size: 12px;
  color: var(--color-slate);
  flex-shrink: 0;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */

/* Tablet largo: 5 colunas → 3 */
@media (max-width: 1200px) {
  .plans-grid { grid-template-columns: repeat(3, 1fr); }
}

/* Tablet: ajustes gerais */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-right { display: none; }
  .faq-inner { grid-template-columns: 1fr; }
  .faq-left { max-width: 560px; }
  .numbers-grid { grid-template-columns: repeat(2, 1fr); gap: var(--spacing-24); }
}

/* Tablet estreito: 3 colunas → 2 */
@media (max-width: 860px) {
  .plans-grid { grid-template-columns: repeat(2, 1fr); }
  .nav-links { display: none; }
  .nav-ctas .btn-ghost { display: inline-flex; }

/* Mobile largo */
@media (max-width: 640px) {
  .container { padding: 0 var(--spacing-16); }
  .display { font-size: 34px; letter-spacing: -0.68px; line-height: 1.1; }
  .heading { font-size: 26px; letter-spacing: -0.5px; }
  .heading-lg { font-size: 28px; letter-spacing: -0.56px; }

  /* Nav */
  .nav-inner { padding: 0 var(--spacing-16); gap: var(--spacing-16); }
  .nav-logo-img { width: 110px; height: 25px; }
  .nav-ctas { gap: var(--spacing-4); }
  .nav-ctas .btn-fill,
  .nav-ctas .btn-ghost { padding: 0 var(--spacing-12); font-size: 13px; }

  /* Hero */
  .hero { padding-top: calc(56px + var(--spacing-48)); padding-bottom: var(--spacing-64); }
  .hero-body { font-size: var(--text-body); }
  .hero-actions { flex-direction: column; gap: var(--spacing-8); }
  .hero-actions .btn-fill,
  .hero-actions .btn-ghost { width: 100%; justify-content: center; height: 44px; font-size: 15px; }

  /* Numbers */
  .numbers-grid { grid-template-columns: repeat(2, 1fr); gap: var(--spacing-20); }
  .number-value { font-size: var(--text-heading); }

  /* Features */
  .features-grid { grid-template-columns: 1fr; gap: var(--spacing-28); }

  /* How */
  .how-steps { flex-direction: column; gap: var(--spacing-32); }
  .how-step { padding: 0; }
  .how-divider { display: none; }

  /* Plans */
  .plans-grid { grid-template-columns: 1fr; }
  .period-toggle { width: 100%; justify-content: stretch; border-radius: 12px; }
  .period-btn { flex: 1; justify-content: center; flex-direction: column; gap: 2px; height: auto; padding: var(--spacing-8) var(--spacing-4); }
  .period-save { font-size: 10px; }

  /* FAQ */
  .faq-question { font-size: var(--text-body); }

  /* CTA */
  .cta-final { padding: var(--spacing-80) 0; }
  .cta-actions { flex-direction: column; width: 100%; }
  .cta-actions .btn-fill,
  .cta-actions .btn-ghost { width: 100%; justify-content: center; height: 44px; }

  /* Footer */
  .footer-inner { flex-direction: column; align-items: flex-start; gap: var(--spacing-16); }
  .footer-links { flex-wrap: wrap; gap: var(--spacing-12); }
  .footer-copy { margin-top: var(--spacing-4); }
}

/* Mobile pequeno */
@media (max-width: 400px) {
  .display { font-size: 28px; letter-spacing: -0.56px; }
  .numbers-grid { grid-template-columns: 1fr 1fr; gap: var(--spacing-16); }
  .number-value { font-size: var(--text-heading-sm); }
  .plan-amount { font-size: var(--text-heading); }
}