/* ════════════════════════════════════════════════
   TUTORÍAS — MATEMÁTICAS & FÍSICA · VALPARAÍSO
   Diseño académico minimalista · DM Serif Display
   ════════════════════════════════════════════════ */

/* ── Variables ─────────────────────────────────── */
:root {
  --ink:        #0f1117;
  --ink-soft:   #3a3f4a;
  --ink-muted:  #737880;
  --bg:         #f9f8f5;
  --bg-card:    #ffffff;
  --bg-tint:    #f2f1ec;
  --accent:     #1a3a6e;      /* azul academia */
  --accent-2:   #c8440a;      /* naranja cálido */
  --accent-light: #e8eef8;
  --border:     #e2e0d8;
  --green:      #2d7a4f;
  --radius:     12px;
  --radius-lg:  20px;
  --shadow-sm:  0 2px 8px rgba(15,17,23,0.06);
  --shadow-md:  0 8px 32px rgba(15,17,23,0.10);
  --shadow-lg:  0 20px 60px rgba(15,17,23,0.14);
  --font-serif: 'DM Serif Display', Georgia, serif;
  --font-sans:  'DM Sans', system-ui, sans-serif;
  --nav-h:      68px;
  --max-w:      1120px;
  --section-gap: 100px;
}

/* ── Reset ─────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }

/* ── Utilidades ────────────────────────────────── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}
.section { padding: var(--section-gap) 0; }

.section__label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin-bottom: 16px;
}
.section__title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.15;
  color: var(--ink);
}
.section__title em {
  font-style: italic;
  color: var(--accent);
}
.section__desc {
  max-width: 600px;
  color: var(--ink-soft);
  font-size: 1.05rem;
  margin-top: 16px;
}
.section__header {
  text-align: center;
  margin-bottom: 60px;
}
.section__header .section__desc { margin: 16px auto 0; }

/* ── Buttons ───────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 500;
  transition: all 0.2s ease;
  cursor: pointer;
}
.btn--primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 20px rgba(26,58,110,0.25);
}
.btn--primary:hover {
  background: #15305e;
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(26,58,110,0.35);
}
.btn--ghost {
  border: 1.5px solid var(--border);
  color: var(--ink-soft);
}
.btn--ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}
.btn--whatsapp {
  background: #25D366;
  color: #fff;
  font-size: 1.05rem;
  font-weight: 600;
  padding: 16px 32px;
  box-shadow: 0 4px 20px rgba(37,211,102,0.30);
}
.btn--whatsapp:hover {
  background: #1eb455;
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(37,211,102,0.40);
}

/* Tags */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.tag {
  background: var(--accent-light);
  color: var(--accent);
  border-radius: 6px;
  padding: 5px 12px;
  font-size: 0.82rem;
  font-weight: 500;
}

/* ═══════════════════════════════════════════════
   NAVEGACIÓN
   ═══════════════════════════════════════════════ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: rgba(249,248,245,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  transition: box-shadow 0.3s;
}
.nav.scrolled { box-shadow: var(--shadow-md); }
.nav__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--ink);
}
.nav__logo-symbol {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  color: var(--accent);
  line-height: 1;
}
.nav__links {
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav__links a {
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 0.9rem;
  color: var(--ink-soft);
  transition: all 0.15s;
}
.nav__links a:hover { color: var(--ink); background: var(--bg-tint); }
.nav__links .nav__cta {
  background: var(--accent);
  color: #fff;
  padding: 7px 16px;
  border-radius: 50px;
  font-weight: 500;
}
.nav__links .nav__cta:hover { background: #15305e; color: #fff; }
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}
.nav__hamburger span {
  width: 22px; height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: all 0.2s;
}

/* ═══════════════════════════════════════════════
   HERO
   ═══════════════════════════════════════════════ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  padding-top: var(--nav-h);
  overflow: hidden;
}
.hero__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(26,58,110,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(26,58,110,0.04) 1px, transparent 1px);
  background-size: 60px 60px;
}
.hero__orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
}
.hero__orb--1 {
  width: 600px; height: 600px;
  background: radial-gradient(circle, #d5e3fa 0%, transparent 70%);
  top: -100px; right: -100px;
  animation: float 8s ease-in-out infinite;
}
.hero__orb--2 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, #fde8da 0%, transparent 70%);
  bottom: 50px; left: -50px;
  animation: float 10s ease-in-out infinite reverse;
}

.hero__formula {
  position: absolute;
  font-family: var(--font-serif);
  font-size: clamp(0.9rem, 1.5vw, 1.2rem);
  color: var(--accent);
  opacity: 0.12;
  white-space: nowrap;
  user-select: none;
}
.hero__formula--1 { top: 20%; left: 5%; transform: rotate(-8deg); }
.hero__formula--2 { top: 55%; right: 8%; transform: rotate(5deg); }
.hero__formula--3 { bottom: 20%; left: 15%; transform: rotate(-3deg); }
.hero__formula--4 { top: 30%; right: 20%; transform: rotate(12deg); opacity: 0.08; font-size: 2rem; }

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 700px;
  padding: 60px 24px;
  margin: 0 auto;
  text-align: center;
  animation: fadeUp 0.8s ease both;
}
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 50px;
  padding: 6px 16px;
  font-size: 0.82rem;
  color: var(--ink-soft);
  margin-bottom: 32px;
  box-shadow: var(--shadow-sm);
}
.hero__title {
  font-family: var(--font-serif);
  font-size: clamp(3rem, 7vw, 5.5rem);
  line-height: 1.05;
  color: var(--ink);
  margin-bottom: 24px;
}
.hero__title em {
  font-style: italic;
  color: var(--accent);
}
.hero__subtitle {
  font-size: 1.15rem;
  color: var(--ink-soft);
  max-width: 520px;
  margin: 0 auto 40px;
  line-height: 1.7;
}
.hero__subtitle strong { color: var(--ink); }
.hero__actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 56px;
}
.hero__stats {
  display: flex;
  gap: 40px;
  justify-content: center;
  flex-wrap: wrap;
  padding-top: 40px;
  border-top: 1px solid var(--border);
}
.hero__stat {
  text-align: center;
}
.hero__stat-num {
  display: block;
  font-family: var(--font-serif);
  font-size: 2.5rem;
  color: var(--accent);
  line-height: 1;
}
.hero__stat-label {
  font-size: 0.8rem;
  color: var(--ink-muted);
  margin-top: 4px;
  display: block;
}

/* ═══════════════════════════════════════════════
   TUTOR
   ═══════════════════════════════════════════════ */
.tutor { background: var(--bg-card); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.tutor__inner {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 80px;
  align-items: center;
}
.tutor__image-col { position: relative; }
.tutor__avatar {
  width: 280px;
  height: 280px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--accent-light);
  position: relative;
}
.tutor__avatar img {
  width: 100%; height: 100%;
  object-fit: cover;
}
.tutor__avatar-icon {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-light);
  border-radius: var(--radius-lg);
}
.tutor__avatar-placeholder {
  width: 100%; height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-weight: 600;
  text-align: center;
  font-size: 0.9rem;
  gap: 12px;
  border: 2px dashed var(--accent);
  border-radius: var(--radius-lg);
}
.tutor__avatar-ring {
  position: absolute;
  inset: -8px;
  border-radius: calc(var(--radius-lg) + 8px);
  border: 2px solid var(--accent);
  opacity: 0.2;
}
.tutor__badge-card {
  position: absolute;
  bottom: -20px;
  right: -20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: var(--shadow-md);
  font-size: 0.85rem;
}
.tutor__badge-icon { font-size: 1.5rem; }
.tutor__badge-card strong { display: block; color: var(--ink); }
.tutor__badge-card span { color: var(--ink-muted); font-size: 0.78rem; }
.tutor__lead {
  font-size: 1.1rem;
  color: var(--ink-soft);
  margin-top: 20px;
  margin-bottom: 16px;
}
.tutor__courses { margin-top: 32px; display: flex; flex-direction: column; gap: 20px; }
.tutor__course-group h3 {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-muted);
  font-weight: 600;
  margin-bottom: 10px;
}

/* ═══════════════════════════════════════════════
   SERVICIOS
   ═══════════════════════════════════════════════ */
.services--math { background: var(--bg); }
.services--physics { background: var(--bg-tint); }

.services__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 32px;
}

.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px;
  position: relative;
  transition: box-shadow 0.2s, transform 0.2s;
}
.service-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.service-card--featured {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent), var(--shadow-sm);
}
.service-card__badge {
  position: absolute;
  top: -14px;
  left: 28px;
  background: var(--accent);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 50px;
}
.service-card__level {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-2);
  font-weight: 600;
  margin-bottom: 10px;
}
.service-card__title {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  margin-bottom: 12px;
  color: var(--ink);
}
.service-card__desc {
  color: var(--ink-soft);
  font-size: 0.92rem;
  margin-bottom: 20px;
  line-height: 1.6;
}
.service-card__list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.service-card__list li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--ink-soft);
}
.service-card__list li::before {
  content: '→';
  color: var(--accent);
  font-weight: 600;
  flex-shrink: 0;
  margin-top: 1px;
}

.services__seo-text {
  color: var(--ink-muted);
  font-size: 0.88rem;
  line-height: 1.7;
  padding: 20px;
  background: var(--bg-tint);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

/* ═══════════════════════════════════════════════
   MATERIAL
   ═══════════════════════════════════════════════ */
.material {
  background: var(--accent);
  color: #fff;
}
.material .section__label { color: rgba(255,255,255,0.6); }
.material .section__title { color: #fff; }
.material .section__title em { color: #a8c5fa; font-style: italic; }

.material__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.material__lead {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.85);
  margin-top: 20px;
  margin-bottom: 16px;
  line-height: 1.7;
}
.material__lead em { color: #a8c5fa; font-style: normal; font-weight: 600; }
.material p { color: rgba(255,255,255,0.7); line-height: 1.7; }
.material__features {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-top: 36px;
}
.material__feature {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.material__feature-icon { font-size: 1.5rem; flex-shrink: 0; margin-top: 2px; }
.material__feature h3 {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 4px;
}
.material__feature p { font-size: 0.9rem; color: rgba(255,255,255,0.65); }

/* Documentos animados */
.material__visual {
  position: relative;
  height: 320px;
}
.material__doc {
  position: absolute;
  background: #fff;
  border-radius: var(--radius);
  padding: 20px;
  width: 260px;
  box-shadow: var(--shadow-lg);
}
.material__doc--1 { top: 0; left: 0; transform: rotate(-3deg); z-index: 1; }
.material__doc--2 { bottom: 0; right: 0; transform: rotate(2deg); z-index: 2; }
.doc__header { display: flex; gap: 6px; margin-bottom: 14px; }
.doc__dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: #e0ddd6;
}
.doc__dot--green { background: #2d7a4f; }
.doc__title {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 10px;
}
.doc__lines { display: flex; flex-direction: column; gap: 6px; }
.doc__line {
  height: 7px;
  background: var(--bg-tint);
  border-radius: 4px;
}
.doc__line--80 { width: 80%; }
.doc__line--60 { width: 60%; }
.doc__line--90 { width: 90%; }
.doc__line--50 { width: 50%; }
.doc__line--70 { width: 70%; }
.doc__line-step {
  height: auto;
  background: transparent;
  font-size: 0.7rem;
  color: var(--accent-2);
  font-weight: 600;
}
.doc__formula {
  font-family: var(--font-serif);
  font-size: 0.85rem;
  color: var(--accent);
  margin-top: 10px;
  padding: 6px 10px;
  background: var(--accent-light);
  border-radius: 6px;
}
.doc__exercise {
  font-size: 0.75rem;
  color: var(--ink-soft);
  padding: 6px 10px;
  background: var(--bg-tint);
  border-radius: 6px;
  margin-bottom: 10px;
}

/* ═══════════════════════════════════════════════
   NIVELES
   ═══════════════════════════════════════════════ */
.levels { background: var(--bg-card); }
.levels__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 60px;
}
.level-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px;
  position: relative;
  overflow: hidden;
  transition: all 0.25s;
}
.level-card:hover { border-color: var(--accent); box-shadow: var(--shadow-md); }
.level-card--uni {
  border-color: var(--accent);
  background: var(--accent-light);
}
.level-card__number {
  font-family: var(--font-serif);
  font-size: 5rem;
  color: var(--accent);
  opacity: 0.08;
  position: absolute;
  top: -10px; right: 20px;
  line-height: 1;
  user-select: none;
}
.level-card__title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  margin-bottom: 12px;
  color: var(--ink);
}
.level-card__desc {
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin-bottom: 20px;
  line-height: 1.65;
}
.level-card__list { display: flex; flex-direction: column; gap: 8px; }
.level-card__list li {
  font-size: 0.88rem;
  color: var(--ink-soft);
  padding-left: 14px;
  position: relative;
}
.level-card__list li::before {
  content: '·';
  position: absolute;
  left: 0;
  color: var(--accent-2);
  font-weight: 700;
}

/* Metodología */
.methodology {
  background: var(--bg-tint);
  border-radius: var(--radius-lg);
  padding: 48px;
  border: 1px solid var(--border);
}
.methodology__title {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  text-align: center;
  margin-bottom: 40px;
}
.methodology__steps {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
}
.method-step {
  flex: 1;
  min-width: 180px;
  text-align: center;
}
.method-step__num {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-family: var(--font-serif);
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 12px;
}
.method-step h4 {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 6px;
}
.method-step p {
  font-size: 0.82rem;
  color: var(--ink-muted);
  line-height: 1.55;
}
.method-step__arrow {
  font-size: 1.5rem;
  color: var(--border);
  margin-top: 14px;
  font-weight: 300;
}

/* ═══════════════════════════════════════════════
   RECURSOS
   ═══════════════════════════════════════════════ */
.resources { background: var(--bg-tint); }
.resources__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.resource-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: all 0.2s;
}
.resource-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.resource-card__icon { font-size: 2rem; }
.resource-card__body { flex: 1; }
.resource-card__subject {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-2);
  font-weight: 600;
  margin-bottom: 6px;
}
.resource-card__title {
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 6px;
  line-height: 1.4;
}
.resource-card__desc {
  font-size: 0.83rem;
  color: var(--ink-muted);
  line-height: 1.55;
}
.resource-card__btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  transition: all 0.15s;
  border: 1px solid transparent;
}
.resource-card__btn:hover {
  background: var(--accent);
  color: #fff;
}

/* ═══════════════════════════════════════════════
   CONTACTO
   ═══════════════════════════════════════════════ */
.contact { background: var(--bg-card); border-top: 1px solid var(--border); }
.contact__inner {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 80px;
  align-items: center;
}
.contact__desc {
  color: var(--ink-soft);
  font-size: 1rem;
  margin-top: 20px;
  margin-bottom: 32px;
  max-width: 480px;
  line-height: 1.7;
}
.contact__info {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 32px;
}
.contact__info-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}
.contact__info-icon { font-size: 1.2rem; margin-top: 2px; }
.contact__info-item strong { display: block; font-size: 0.9rem; color: var(--ink); }
.contact__info-item span { font-size: 0.85rem; color: var(--ink-muted); }

/* QR */
.qr__frame {
  background: var(--bg-tint);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.qr__placeholder {
  width: 200px;
  height: 200px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 2px dashed var(--border);
  color: var(--ink-muted);
  font-size: 0.78rem;
  text-align: center;
}
.qr__placeholder small { font-size: 0.68rem; }
/* Cuando tengas el QR real: reemplaza .qr__placeholder con una etiqueta <img> */
.qr__label {
  text-align: center;
  font-size: 0.8rem;
  color: var(--ink-muted);
  margin-top: 12px;
}

/* ═══════════════════════════════════════════════
   FOOTER
   ═══════════════════════════════════════════════ */
.footer {
  background: var(--ink);
  color: rgba(255,255,255,0.6);
  padding: 60px 0 32px;
}
.footer__inner {
  display: flex;
  justify-content: space-between;
  gap: 40px;
  margin-bottom: 40px;
  align-items: flex-start;
}
.footer .nav__logo { color: #fff; }
.footer .nav__logo-symbol { color: #a8c5fa; }
.footer__brand p {
  margin-top: 14px;
  font-size: 0.85rem;
  max-width: 280px;
  line-height: 1.6;
}
.footer__nav ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer__nav a {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.55);
  transition: color 0.15s;
}
.footer__nav a:hover { color: #fff; }
.footer__bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.footer__bottom p { font-size: 0.8rem; }
.footer__seo { color: rgba(255,255,255,0.25); font-size: 0.72rem !important; }

/* ═══════════════════════════════════════════════
   ANIMACIONES
   ═══════════════════════════════════════════════ */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}

/* Animate on scroll */
.animate-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.animate-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ═══════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════ */
@media (max-width: 900px) {
  :root { --section-gap: 70px; }

  .tutor__inner {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .tutor__image-col { display: flex; gap: 24px; align-items: flex-end; }
  .tutor__avatar { width: 180px; height: 180px; flex-shrink: 0; }
  .tutor__badge-card { position: static; }

  .services__grid,
  .material__inner,
  .contact__inner {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .levels__grid { grid-template-columns: 1fr; }
  .resources__grid { grid-template-columns: 1fr 1fr; }

  .material__visual { height: 240px; }
  .material__doc { width: 200px; }
  .material__doc--2 { right: 0; bottom: 0; }

  .methodology__steps { flex-direction: column; align-items: stretch; }
  .method-step__arrow { display: none; }

  .footer__inner { flex-direction: column; }
}

@media (max-width: 640px) {
  .nav__links {
    display: none;
    position: fixed;
    top: var(--nav-h);
    left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 20px 24px;
    gap: 4px;
    box-shadow: var(--shadow-md);
  }
  .nav__links.open { display: flex; }
  .nav__links a { width: 100%; padding: 10px 16px; }
  .nav__hamburger { display: flex; }

  .hero__title { font-size: 2.8rem; }
  .hero__stats { gap: 24px; }

  .services__grid { grid-template-columns: 1fr; }
  .resources__grid { grid-template-columns: 1fr; }

  .tutor__image-col { flex-direction: column; }

  .contact__inner { grid-template-columns: 1fr; }
  .hero__actions { flex-direction: column; align-items: center; }
}

/* ═══════════════════════════════════════════════
   CTA AGENDAR
   ═══════════════════════════════════════════════ */
.cta-agendar {
  background: var(--accent);
  padding: 64px 0;
}
.cta-agendar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
}
.cta-agendar__title {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  color: #fff;
  line-height: 1.2;
  margin-bottom: 10px;
}
.cta-agendar__title em {
  font-style: italic;
  color: #a8c5fa;
}
.cta-agendar__text p {
  color: rgba(255,255,255,0.7);
  font-size: 1rem;
}
.cta-agendar__actions {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  flex-shrink: 0;
}
.btn--lg {
  font-size: 1.1rem;
  padding: 18px 36px;
}
.cta-agendar__hint {
  font-size: 0.78rem;
  color: rgba(255,255,255,0.5);
  padding-left: 4px;
}

/* ═══════════════════════════════════════════════
   FAQ
   ═══════════════════════════════════════════════ */
.faq { background: var(--bg); }
.faq__grid {
  max-width: 780px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.faq__item {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-card);
  transition: border-color 0.2s;
}
.faq__item:has(.faq__question[aria-expanded="true"]) {
  border-color: var(--accent);
}
.faq__question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  text-align: left;
  font-size: 0.97rem;
  font-weight: 500;
  color: var(--ink);
  cursor: pointer;
  background: none;
  transition: background 0.15s;
}
.faq__question:hover { background: var(--bg-tint); }
.faq__question[aria-expanded="true"] { color: var(--accent); }
.faq__icon {
  font-size: 1.4rem;
  font-weight: 300;
  color: var(--accent);
  flex-shrink: 0;
  line-height: 1;
  transition: transform 0.25s ease;
}
.faq__question[aria-expanded="true"] .faq__icon {
  transform: rotate(45deg);
}
.faq__answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}
.faq__answer:not([hidden]) {
  max-height: 300px;
  padding: 0 24px 20px;
}
.faq__answer p {
  font-size: 0.92rem;
  color: var(--ink-soft);
  line-height: 1.7;
}
.faq__answer strong { color: var(--ink); }

@media (max-width: 768px) {
  .cta-agendar__inner { flex-direction: column; align-items: flex-start; }
  .cta-agendar__actions { width: 100%; }
  .cta-agendar__actions .btn { width: 100%; justify-content: center; }
}

/* ═══════════════════════════════════════════════
   PAES
   ═══════════════════════════════════════════════ */
.paes { background: var(--bg-card); border-top: 1px solid var(--border); }

.paes__experience {
  margin-bottom: 40px;
  display: flex;
  justify-content: center;
}
.paes__exp-badge {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background: var(--accent-light);
  border: 1px solid var(--accent);
  border-radius: var(--radius-lg);
  padding: 20px 28px;
  max-width: 600px;
}
.paes__exp-icon { font-size: 1.8rem; flex-shrink: 0; margin-top: 2px; }
.paes__exp-badge strong {
  display: block;
  color: var(--accent);
  font-size: 0.95rem;
  margin-bottom: 4px;
}
.paes__exp-badge span {
  font-size: 0.88rem;
  color: var(--ink-soft);
  line-height: 1.6;
}

.paes__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}
.paes-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all 0.2s;
}
.paes-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.paes-card--highlight {
  background: var(--accent-light);
  border-color: var(--accent);
}
.paes-card__subject {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-2);
  margin-bottom: 10px;
}
.paes-card__icon { font-size: 1.1rem; }
.paes-card__title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  color: var(--ink);
  margin-bottom: 16px;
  line-height: 1.3;
}
.paes-card__list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.paes-card__list li {
  font-size: 0.88rem;
  color: var(--ink-soft);
  padding-left: 14px;
  position: relative;
  line-height: 1.5;
}
.paes-card__list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.8rem;
}

.paes__cta {
  text-align: center;
  padding: 40px;
  background: var(--bg-tint);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  margin-bottom: 28px;
}
.paes__cta p {
  font-size: 1rem;
  color: var(--ink-soft);
  margin-bottom: 20px;
}

@media (max-width: 900px) {
  .paes__grid { grid-template-columns: 1fr; }
  .paes__exp-badge { flex-direction: column; }
}