/* ===== Quanta Aulas — Redesign ===== */

:root {
  --bg: #07120d;
  --bg-elev: #0e1d16;
  --bg-card: #112620;
  --line: rgba(34, 197, 94, 0.14);
  --line-strong: rgba(34, 197, 94, 0.28);

  --ink: #e8f5ee;
  --ink-dim: #9db0a6;
  --ink-mute: #6b8076;

  --brand: #1fd685;
  --brand-deep: #16a86a;
  --brand-soft: rgba(31, 214, 133, 0.12);
  --brand-glow: rgba(31, 214, 133, 0.35);

  --warn: #f5b94a;

  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  --shadow-card: 0 1px 0 rgba(255,255,255,0.04) inset, 0 24px 48px -24px rgba(0,0,0,0.6);

  --display: 'Plus Jakarta Sans', 'Inter', system-ui, sans-serif;
  --body: 'Inter', system-ui, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* Ambient mesh */
.bg-ambient {
  position: fixed; inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(60% 50% at 80% 0%, rgba(31, 214, 133, 0.18), transparent 60%),
    radial-gradient(40% 40% at 0% 30%, rgba(31, 214, 133, 0.10), transparent 60%),
    radial-gradient(50% 50% at 50% 100%, rgba(31, 214, 133, 0.08), transparent 60%);
  filter: blur(20px);
}

.bg-grid {
  position: fixed; inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(rgba(34, 197, 94, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34, 197, 94, 0.045) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 30%, #000 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 30%, #000 30%, transparent 80%);
}

main, header, footer { position: relative; z-index: 1; }

/* Layout */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 32px;
}

@media (max-width: 720px) {
  .container { padding: 0 20px; }
}

/* ====== Type ====== */
.eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--brand);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.eyebrow::before {
  content: '';
  width: 6px; height: 6px;
  background: var(--brand);
  border-radius: 50%;
  box-shadow: 0 0 12px var(--brand-glow);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

h1, h2, h3, h4 {
  font-family: var(--display);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.05;
  margin: 0;
  color: var(--ink);
}

.h-display {
  font-size: clamp(48px, 6.5vw, 92px);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 0.98;
}

.h-section {
  font-size: clamp(36px, 4vw, 56px);
  letter-spacing: -0.025em;
  line-height: 1.05;
}

.h-card {
  font-size: clamp(20px, 1.6vw, 24px);
  font-weight: 600;
  letter-spacing: -0.015em;
}

p { margin: 0; color: var(--ink-dim); }
.lead { font-size: 18px; line-height: 1.6; color: var(--ink-dim); max-width: 60ch; }

.grad-text {
  background: linear-gradient(135deg, #ffffff 0%, #c4f5dc 50%, var(--brand) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.brand-text { color: var(--brand); }

/* ====== Header / Nav ====== */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(7, 18, 13, 0.72);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, background 0.3s ease;
}
.nav.scrolled {
  border-bottom-color: var(--line);
  background: rgba(7, 18, 13, 0.88);
}
.nav-inner {
  display: flex;
  align-items: center;
  gap: 32px;
  height: 72px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
}
.nav-logo svg { width: 28px; height: 28px; }
.nav-logo .name {
  font-family: var(--display);
  font-weight: 800;
  font-size: 16px;
  letter-spacing: 0.02em;
}
.nav-logo .tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--ink-mute);
  text-transform: uppercase;
  display: block;
  line-height: 1;
  margin-top: 3px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}
.nav-link {
  position: relative;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-dim);
  text-decoration: none;
  border-radius: 999px;
  transition: color 0.2s ease, background 0.2s ease;
}
.nav-link:hover {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.04);
}

.lang-toggle {
  display: inline-flex;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 3px;
  margin-left: 8px;
}
.lang-toggle button {
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  padding: 5px 10px;
  border-radius: 999px;
  color: var(--ink-dim);
  transition: all 0.2s ease;
}
.lang-toggle button.active {
  background: var(--brand);
  color: #062014;
}

@media (max-width: 900px) {
  .nav-links .nav-link:not(.cta) { display: none; }
}

/* ====== Buttons ====== */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 22px;
  font-family: var(--display);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.005em;
  border-radius: 12px;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease, border-color 0.18s ease;
  white-space: nowrap;
}
.btn-primary {
  background: var(--brand);
  color: #062014;
  box-shadow: 0 0 0 0 var(--brand-glow), 0 8px 24px -8px var(--brand-glow);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 0 4px var(--brand-soft), 0 12px 28px -8px var(--brand-glow);
}
.btn-primary:active { transform: translateY(0); }

.btn-ghost {
  background: rgba(255,255,255,0.04);
  color: var(--ink);
  border-color: var(--line-strong);
}
.btn-ghost:hover {
  background: rgba(255,255,255,0.08);
  border-color: var(--brand);
}

.btn-arrow {
  width: 16px; height: 16px;
  transition: transform 0.18s ease;
}
.btn:hover .btn-arrow { transform: translateX(3px); }

/* ====== Pill / Tag ====== */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: var(--brand-soft);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  color: var(--brand);
}
.pill .dot {
  width: 6px; height: 6px;
  background: var(--brand);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--brand-glow);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 12px;
  color: var(--ink-dim);
  font-weight: 500;
}

/* ====== Hero ====== */
.hero {
  padding: 56px 0 96px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 56px;
  align-items: start;
}
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
}

.hero-headline span {
  display: inline-block;
  opacity: 0;
  transform: translateY(40px);
  animation: rise 0.9s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
}
.hero-headline .word-1 { animation-delay: 0.05s; }
.hero-headline .word-2 { animation-delay: 0.10s; }
.hero-headline .word-3 { animation-delay: 0.15s; }
.hero-headline .word-4 { animation-delay: 0.20s; }
.hero-headline .word-5 { animation-delay: 0.25s; }
.hero-headline .word-6 { animation-delay: 0.30s; }
.hero-headline .word-7 { animation-delay: 0.35s; }
.hero-headline .word-8 { animation-delay: 0.40s; }
.hero-headline .word-9 { animation-delay: 0.45s; }

@keyframes rise {
  to { opacity: 1; transform: translateY(0); }
}

.hero-sub {
  margin-top: 28px;
  max-width: 56ch;
  opacity: 0;
  animation: fade 0.7s ease forwards;
  animation-delay: 0.55s;
}
@keyframes fade { to { opacity: 1; } }

.hero-cta-row {
  display: flex;
  gap: 12px;
  margin-top: 32px;
  opacity: 0;
  animation: fade 0.7s ease forwards;
  animation-delay: 0.7s;
  flex-wrap: wrap;
}

.hero-trust {
  margin-top: 28px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  opacity: 0;
  animation: fade 0.7s ease forwards;
  animation-delay: 0.85s;
}

/* Hero Right Side - Card */
.hero-card {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--line-strong);
  background: var(--bg-elev);
  box-shadow: var(--shadow-card), 0 0 60px -20px var(--brand-glow);
  opacity: 0;
  transform: translateY(20px) scale(0.98);
  animation: rise-card 0.9s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
  animation-delay: 0.3s;
}
@keyframes rise-card {
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.hero-portrait {
  position: relative;
  aspect-ratio: 4 / 3;
  background:
    linear-gradient(180deg, transparent 50%, rgba(7, 18, 13, 0.85) 100%),
    repeating-linear-gradient(45deg, rgba(31, 214, 133, 0.06) 0 2px, transparent 2px 14px),
    radial-gradient(circle at 30% 30%, rgba(31, 214, 133, 0.18), transparent 50%),
    #0a1f17;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.hero-portrait::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(7, 18, 13, 0.5) 100%);
}
.portrait-placeholder {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-mute);
  text-align: center;
  padding: 16px;
}

.hero-card-meta {
  position: absolute;
  top: 16px;
  right: 16px;
  display: flex;
  gap: 6px;
  align-items: center;
  background: rgba(7, 18, 13, 0.7);
  backdrop-filter: blur(12px);
  border: 1px solid var(--line);
  padding: 6px 10px;
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink);
}
.stars { color: var(--warn); letter-spacing: 1px; }

.hero-card-body {
  padding: 22px 24px 24px;
  border-top: 1px solid var(--line);
}
.hero-card-label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--brand);
  margin-bottom: 8px;
}
.hero-card-quote {
  font-family: var(--display);
  font-size: 15px;
  line-height: 1.5;
  color: var(--ink);
  font-weight: 500;
}

/* Stats Grid in Card */
.stats-mini {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
}
.stat-mini {
  background: var(--bg-elev);
  padding: 18px 20px;
  position: relative;
  overflow: hidden;
  cursor: default;
  transition: background 0.2s ease;
}
.stat-mini:hover { background: var(--bg-card); }
.stat-mini:hover .stat-mini-spark {
  transform: translateX(0);
  opacity: 1;
}
.stat-mini-num {
  font-family: var(--display);
  font-size: 28px;
  font-weight: 700;
  color: var(--brand);
  letter-spacing: -0.02em;
  line-height: 1;
}
.stat-mini-label {
  margin-top: 6px;
  font-size: 12px;
  color: var(--ink-dim);
  letter-spacing: 0.01em;
}
.stat-mini-spark {
  position: absolute;
  top: 14px; right: 14px;
  width: 14px; height: 14px;
  color: var(--brand);
  transform: translateX(6px);
  opacity: 0;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

/* ====== Marquee Trust Bar ====== */
.marquee {
  margin-top: 40px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(90deg, var(--bg) 0%, transparent 6%, transparent 94%, var(--bg) 100%),
    var(--bg-elev);
  position: relative;
  overflow: hidden;
}
.marquee-track {
  display: flex;
  gap: 56px;
  padding: 18px 0;
  animation: scroll-x 40s linear infinite;
  width: max-content;
  white-space: nowrap;
}
@keyframes scroll-x {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}
.marquee-item {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--display);
  font-weight: 600;
  font-size: 16px;
  color: var(--ink);
  letter-spacing: -0.005em;
}
.marquee-item .ico {
  color: var(--brand);
  font-size: 18px;
}
.marquee-sep {
  color: var(--brand);
  opacity: 0.4;
}

/* ====== Section ====== */
.section {
  padding: 120px 0;
}
.section-head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 64px;
  align-items: end;
  margin-bottom: 56px;
}
@media (max-width: 720px) {
  .section-head { grid-template-columns: 1fr; gap: 16px; }
}
.section-head .lead { margin-top: 16px; }

/* ====== Subjects Grid ====== */
.subjects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
@media (max-width: 900px) {
  .subjects-grid { grid-template-columns: 1fr; }
}

.subject-card {
  background: var(--bg-elev);
  padding: 36px 32px;
  position: relative;
  cursor: pointer;
  transition: background 0.3s ease;
  overflow: hidden;
}
.subject-card:hover { background: var(--bg-card); }
.subject-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at var(--mx, 50%) var(--my, 50%), var(--brand-soft), transparent 40%);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}
.subject-card:hover::before { opacity: 1; }

.subject-num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink-mute);
  margin-bottom: 24px;
}
.subject-icon {
  width: 56px; height: 56px;
  border-radius: 14px;
  background: var(--brand-soft);
  border: 1px solid var(--line-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--brand);
  margin-bottom: 28px;
  position: relative;
  transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.subject-card:hover .subject-icon { transform: rotate(-6deg) scale(1.05); }
.subject-icon svg { width: 26px; height: 26px; }

.subject-title {
  font-family: var(--display);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
  color: var(--ink);
}
.subject-desc {
  font-size: 14px;
  color: var(--ink-dim);
  margin-bottom: 22px;
  line-height: 1.55;
}
.subject-topics {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.subject-topic {
  font-family: var(--mono);
  font-size: 11px;
  padding: 4px 9px;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink-dim);
  letter-spacing: 0.02em;
  transition: color 0.2s, border-color 0.2s;
}
.subject-card:hover .subject-topic {
  border-color: var(--line-strong);
  color: var(--ink);
}

.subject-arrow {
  position: absolute;
  top: 32px; right: 32px;
  width: 28px; height: 28px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-dim);
  transition: all 0.25s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.subject-card:hover .subject-arrow {
  background: var(--brand);
  border-color: var(--brand);
  color: #062014;
  transform: rotate(-45deg);
}

/* ====== Method / How it works ====== */
.method {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
@media (max-width: 900px) {
  .method { grid-template-columns: 1fr; gap: 40px; }
}

.method-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.method-step {
  border: 1px solid var(--line);
  background: var(--bg-elev);
  border-radius: var(--radius);
  padding: 24px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 20px;
  align-items: center;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease;
}
.method-step:hover { background: var(--bg-card); border-color: var(--line-strong); }
.method-step.active { background: var(--bg-card); border-color: var(--brand); }
.method-step.active .step-num {
  background: var(--brand);
  color: #062014;
  border-color: var(--brand);
}

.step-num {
  width: 40px; height: 40px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-weight: 600;
  font-size: 13px;
  color: var(--brand);
  transition: all 0.25s ease;
}
.step-title {
  font-family: var(--display);
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.step-desc {
  font-size: 14px;
  color: var(--ink-dim);
  margin-top: 4px;
  display: none;
}
.method-step.active .step-desc { display: block; }
.step-icon {
  color: var(--ink-mute);
  transition: color 0.2s ease, transform 0.2s ease;
}
.method-step.active .step-icon {
  color: var(--brand);
  transform: rotate(90deg);
}

.method-visual {
  position: relative;
  aspect-ratio: 4 / 5;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-strong);
  background: var(--bg-elev);
  overflow: hidden;
  padding: 28px;
}
.visual-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(34, 197, 94, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34, 197, 94, 0.06) 1px, transparent 1px);
  background-size: 32px 32px;
}
.visual-stage {
  position: relative;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.equation {
  font-family: var(--display);
  font-size: clamp(28px, 3.6vw, 48px);
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--ink);
  line-height: 1.1;
}
.equation .e-op { color: var(--brand); margin: 0 6px; }
.equation .e-frac {
  display: inline-flex;
  flex-direction: column;
  vertical-align: middle;
  font-size: 0.75em;
  margin: 0 4px;
  text-align: center;
}
.equation .e-frac .num {
  border-bottom: 2px solid var(--brand);
  padding-bottom: 2px;
}
.visual-axis {
  height: 140px;
  position: relative;
}
.visual-axis svg { width: 100%; height: 100%; }
.visual-axis .curve {
  fill: none;
  stroke: var(--brand);
  stroke-width: 2.5;
  stroke-dasharray: 600;
  stroke-dashoffset: 600;
  animation: draw-curve 2.5s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
  animation-iteration-count: infinite;
  animation-delay: 0.5s;
  filter: drop-shadow(0 0 6px var(--brand-glow));
}
@keyframes draw-curve {
  0% { stroke-dashoffset: 600; }
  60% { stroke-dashoffset: 0; }
  100% { stroke-dashoffset: 0; opacity: 1; }
}

/* ====== Testimonials ====== */
.testimonials {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
@media (max-width: 900px) {
  .testimonials { grid-template-columns: 1fr; }
}

.testimonial {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  position: relative;
  transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1), border-color 0.3s ease;
}
.testimonial:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
}
.testimonial .quote-mark {
  font-family: var(--display);
  font-size: 64px;
  line-height: 0.6;
  color: var(--brand);
  opacity: 0.3;
  margin-bottom: 12px;
  display: block;
}
.testimonial-text {
  font-size: 15px;
  line-height: 1.65;
  color: var(--ink);
  margin-bottom: 24px;
}
.testimonial-meta {
  display: flex;
  gap: 12px;
  align-items: center;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}
.avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--brand-soft);
  border: 1px solid var(--line-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--display);
  font-weight: 700;
  color: var(--brand);
  font-size: 14px;
}
.testimonial-name {
  font-family: var(--display);
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
}
.testimonial-role {
  font-size: 12px;
  color: var(--ink-mute);
  font-family: var(--mono);
  letter-spacing: 0.04em;
}

/* ====== FAQ ====== */
.faq {
  max-width: 800px;
  margin: 0 auto;
}
.faq-item {
  border-bottom: 1px solid var(--line);
  padding: 24px 0;
  cursor: pointer;
}
.faq-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  font-family: var(--display);
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.faq-icon {
  width: 28px; height: 28px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--brand);
  flex-shrink: 0;
  transition: transform 0.3s ease, background 0.3s ease;
}
.faq-item.open .faq-icon {
  background: var(--brand);
  color: #062014;
  transform: rotate(45deg);
}
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.2, 0.8, 0.2, 1), margin-top 0.3s ease;
}
.faq-item.open .faq-a {
  max-height: 200px;
  margin-top: 16px;
}
.faq-a-inner {
  font-size: 15px;
  line-height: 1.65;
  color: var(--ink-dim);
  max-width: 64ch;
}

/* ====== CTA Strip ====== */
.cta-strip {
  position: relative;
  border-radius: var(--radius-xl);
  background:
    radial-gradient(80% 100% at 80% 0%, var(--brand-soft) 0%, transparent 50%),
    var(--bg-elev);
  border: 1px solid var(--line-strong);
  padding: 64px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px;
  align-items: center;
  overflow: hidden;
}
@media (max-width: 720px) {
  .cta-strip { grid-template-columns: 1fr; padding: 40px 28px; }
}
.cta-strip::before {
  content: '';
  position: absolute;
  top: -60%;
  right: -10%;
  width: 80%;
  height: 200%;
  background: radial-gradient(circle, var(--brand-glow), transparent 60%);
  filter: blur(40px);
  opacity: 0.5;
  pointer-events: none;
  animation: orb 8s ease-in-out infinite;
}
@keyframes orb {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-10%, 5%) scale(1.1); }
}
.cta-strip h2 {
  position: relative;
  z-index: 1;
}

/* ====== Footer ====== */
.footer {
  padding: 80px 0 32px;
  border-top: 1px solid var(--line);
  margin-top: 80px;
  position: relative;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 56px;
}
@media (max-width: 720px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
.footer-col h4 {
  font-size: 12px;
  font-family: var(--mono);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 16px;
  font-weight: 500;
}
.footer-col a {
  display: block;
  font-size: 14px;
  color: var(--ink-dim);
  text-decoration: none;
  padding: 6px 0;
  transition: color 0.2s ease;
}
.footer-col a:hover { color: var(--brand); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 32px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--ink-mute);
  font-family: var(--mono);
  letter-spacing: 0.04em;
}

/* big logo word */
.footer-mega {
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(80px, 16vw, 240px);
  letter-spacing: -0.06em;
  line-height: 0.85;
  color: transparent;
  -webkit-text-stroke: 1px var(--line-strong);
  margin-top: 40px;
  text-align: center;
  user-select: none;
  background: linear-gradient(180deg, var(--line-strong) 0%, transparent 70%);
  -webkit-background-clip: text;
  background-clip: text;
}

/* Reveal on scroll */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s cubic-bezier(0.2, 0.8, 0.2, 1), transform 0.7s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.reveal.in {
  opacity: 1;
  transform: translateY(0);
}

/* Logo SVG inline */
.logo-mark {
  width: 32px; height: 32px;
  display: block;
}

/* ============================================
   Quanta Aulas — adições da migração estática
   ============================================ */

/* Sistema bilíngue PT/EN
   (controlado por classes lang-pt / lang-en em <html>) */
html.lang-pt [data-lang="en"],
html.lang-pt [data-lang-inline="en"],
html.lang-en [data-lang="pt"],
html.lang-en [data-lang-inline="pt"] {
  display: none !important;
}

/* Subjects grid — 6 matérias em 3x2 */
.subjects-grid.subjects-6 {
  grid-template-columns: repeat(3, 1fr);
}
@media (max-width: 900px) {
  .subjects-grid.subjects-6 { grid-template-columns: 1fr; }
}
@media (min-width: 901px) and (max-width: 1100px) {
  .subjects-grid.subjects-6 { grid-template-columns: repeat(2, 1fr); }
}

/* Note "+ muitas outras" abaixo das matérias */
.subjects-extra {
  margin-top: 24px;
  text-align: center;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--ink-mute);
}
.subjects-extra a {
  color: var(--brand);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
}
.subjects-extra a:hover { color: var(--ink); border-color: var(--brand); }

/* Foto real do professor no hero card */
.hero-portrait img.portrait-photo {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}
.hero-portrait .hero-card-meta { z-index: 2; }
.hero-portrait::after { z-index: 1; }

/* Logo PNG inline no nav (vez da SVG) */
.nav-logo img.logo-img,
.footer-col .nav-logo img.logo-img {
  width: 32px;
  height: 32px;
  object-fit: contain;
  filter: drop-shadow(0 0 8px var(--brand-glow));
}

/* Botão flutuante de WhatsApp */
.whatsapp-float {
  position: fixed;
  right: 22px;
  bottom: 22px;
  width: 58px;
  height: 58px;
  border-radius: 50%;
  background: #25D366;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  box-shadow:
    0 0 0 0 rgba(37, 211, 102, 0.6),
    0 12px 28px -8px rgba(0, 0, 0, 0.55);
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  animation: wa-pulse 2.4s ease-in-out infinite;
}
.whatsapp-float svg { width: 30px; height: 30px; fill: #fff; }
.whatsapp-float:hover {
  transform: translateY(-2px) scale(1.04);
  box-shadow:
    0 0 0 6px rgba(37, 211, 102, 0.18),
    0 16px 32px -8px rgba(0, 0, 0, 0.6);
}
@keyframes wa-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(37, 211, 102, 0.45), 0 12px 28px -8px rgba(0,0,0,0.55); }
  50%      { box-shadow: 0 0 0 14px rgba(37, 211, 102, 0), 0 12px 28px -8px rgba(0,0,0,0.55); }
}
@media (max-width: 480px) {
  .whatsapp-float { right: 16px; bottom: 16px; width: 54px; height: 54px; }
  .whatsapp-float svg { width: 28px; height: 28px; }
}

/* Bandeiras de países atendidos */
.countries-row {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 20px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-mute);
  text-transform: uppercase;
}
.countries-row span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg-elev);
}

/* Menu mobile (hambúrguer) */
.menu-toggle {
  display: none;
  background: var(--bg-card);
  border: 1px solid var(--line);
  width: 40px;
  height: 40px;
  border-radius: 10px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  margin-left: 8px;
  color: var(--ink);
}
.menu-toggle svg { width: 20px; height: 20px; stroke: currentColor; fill: none; stroke-width: 2; }

.mobile-panel {
  display: none;
  position: fixed;
  inset: 72px 0 0 0;
  background: rgba(7, 18, 13, 0.97);
  backdrop-filter: blur(20px);
  z-index: 49;
  padding: 32px 24px;
  flex-direction: column;
  gap: 8px;
}
.mobile-panel.open { display: flex; }
.mobile-panel a {
  font-family: var(--display);
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}
.mobile-panel a:hover { color: var(--brand); }
.mobile-panel .mobile-cta {
  margin-top: 20px;
  text-align: center;
  background: var(--brand);
  color: #062014;
  border-radius: 12px;
  border: none;
  padding: 16px;
}

@media (max-width: 900px) {
  .nav-links .nav-link,
  .nav-links .lang-toggle { display: none; }
  .nav-links .lang-toggle.lang-toggle-mobile-show { display: inline-flex; }
  .menu-toggle { display: inline-flex; }
}

/* Hero photo: garante que a aspect-ratio funcione com a foto retrato */
@media (max-width: 720px) {
  .hero-portrait { aspect-ratio: 4 / 5; }
}

/* Footer: logo PNG */
.footer .nav-logo .name { color: var(--ink); }

/* Animação suave no link do Superprof após depoimentos */
.superprof-cta {
  display: flex;
  justify-content: center;
  margin-top: 40px;
}

/* Ajuste do headline pra evitar quebra ruim em colunas estreitas */
.hero-headline.h-display {
  font-size: clamp(38px, 4.6vw, 72px);
  line-height: 1.04;
  letter-spacing: -0.025em;
}
.hero-headline span {
  margin-right: 0.18em;
}
@media (max-width: 720px) {
  .hero-headline.h-display { font-size: clamp(34px, 9vw, 48px); }
}

/* Simplifica animação do headline pra evitar bug ao trocar idioma */
.hero-headline span {
  animation: none !important;
  opacity: 1 !important;
  transform: none !important;
}
.hero-headline.h-display {
  opacity: 0;
  animation: fade 0.9s ease forwards;
  animation-delay: 0.1s;
}