/* =========================================================
   ISAC DANIEL — Folha de Estilo Principal
   ========================================================= */

:root {
  --primary: #3498db;
  --primary-dark: #2980b9;
  --primary-glow: rgba(52, 152, 219, 0.25);

  --bg-dark: #0f0f0f;
  --bg-alt: #141414;
  --bg-card: #1a1a1a;
  --bg-elevated: #222;

  --text-main: #f5f5f5;
  --text-dim: #b0b0b0;
  --text-muted: #7a7a7a;

  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.15);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;

  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 10px 40px var(--primary-glow);

  --transition: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  --transition-fast: 0.18s ease;

  --container-max: 1200px;
  --header-height: 70px;

  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, 'Courier New', monospace;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }
ul, ol { list-style: none; }

::selection { background: var(--primary); color: #fff; }

.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  padding: 12px 20px;
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius-sm);
  z-index: 9999;
  font-weight: 600;
  transition: top var(--transition-fast);
}
.skip-link:focus { top: 16px; }

:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--header-height);
  background: rgba(15, 15, 15, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  transition: background var(--transition-fast);
}

.site-header.scrolled {
  background: rgba(15, 15, 15, 0.98);
  box-shadow: var(--shadow-sm);
}

.nav {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 5%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  transition: var(--transition-fast);
}
.logo span { color: var(--primary); }
.logo:hover { transform: translateY(-1px); }

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-menu a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-dim);
  position: relative;
  transition: var(--transition-fast);
}

.nav-menu a::after {
  content: '';
  position: absolute;
  left: 0; bottom: -6px;
  width: 0; height: 2px;
  background: var(--primary);
  transition: width var(--transition);
}

.nav-menu a:hover,
.nav-menu a.active { color: var(--text-main); }
.nav-menu a:hover::after,
.nav-menu a.active::after { width: 100%; }

.nav-cta {
  padding: 10px 20px !important;
  background: var(--primary);
  color: #fff !important;
  border-radius: var(--radius-sm);
  font-weight: 600 !important;
}
.nav-cta::after { display: none; }
.nav-cta:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: var(--transition);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: calc(var(--header-height) + 40px) 5% 60px;
  background:
    radial-gradient(circle at 50% 30%, rgba(52, 152, 219, 0.12) 0%, transparent 60%),
    radial-gradient(circle at 80% 80%, rgba(41, 128, 185, 0.08) 0%, transparent 50%),
    var(--bg-dark);
  position: relative;
  overflow: hidden;
}

.hero-small { min-height: 55vh; }

.hero-content {
  max-width: 820px;
  animation: fadeUp 0.9s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.hero-eyebrow {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 1.2rem;
  padding: 6px 16px;
  background: rgba(52, 152, 219, 0.1);
  border-radius: 999px;
}

.hero h1 {
  font-size: clamp(2.2rem, 5.5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -1.5px;
  margin-bottom: 1.5rem;
}
.hero h1 span {
  color: var(--primary);
  background: linear-gradient(135deg, var(--primary), #5dade2);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-text {
  font-size: clamp(1rem, 1.4vw, 1.2rem);
  color: var(--text-dim);
  max-width: 700px;
  margin: 0 auto;
}
.hero-text strong { color: var(--text-main); font-weight: 600; }

.hero-btns {
  margin-top: 2.5rem;
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-stats {
  margin-top: 3.5rem;
  display: flex;
  justify-content: center;
  gap: 3rem;
  flex-wrap: wrap;
}
.hero-stats li {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}
.hero-stats strong { font-size: 1.6rem; font-weight: 800; color: var(--primary); }
.hero-stats span {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
}

.hero-meta {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.6rem;
}

.meta-pill {
  display: inline-block;
  padding: 6px 14px;
  background: rgba(52, 152, 219, 0.1);
  border: 1px solid rgba(52, 152, 219, 0.3);
  color: var(--primary);
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.4px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 30px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

.btn-secondary {
  background: transparent;
  color: var(--text-main);
  border: 1px solid var(--border-strong);
}
.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-3px);
}

.btn-block { width: 100%; }

.btn:disabled,
.btn[disabled] {
  opacity: 0.65;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}

/* ---------- Sections ---------- */
.section { padding: 100px 5%; max-width: var(--container-max); margin: 0 auto; }
.section-alt {
  background: var(--bg-alt);
  max-width: none;
  padding-inline: 5%;
}
.section-alt > * { max-width: var(--container-max); margin-inline: auto; }

.section-header { text-align: center; margin-bottom: 4rem; }

.section-eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 0.8rem;
}

.section-header h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 1rem;
}

.section-desc {
  color: var(--text-dim);
  max-width: 640px;
  margin: 0 auto;
}

/* ---------- Grids ---------- */
.grid-layout {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.8rem;
}

.grid-2, .grid-3 { display: grid; gap: 1.2rem; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

/* ---------- Cards ---------- */
.card-moderno,
.servico-card,
.mini-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.2rem;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.card-moderno::before {
  content: '';
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), transparent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.card-moderno:hover::before { transform: scaleX(1); }

.card-moderno:hover,
.servico-card:hover {
  border-color: var(--primary);
  transform: translateY(-8px);
  background: var(--bg-elevated);
  box-shadow: var(--shadow-md);
}

.card-moderno h3,
.servico-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.8rem;
  letter-spacing: -0.3px;
}

.card-moderno p,
.servico-card p {
  color: var(--text-dim);
  font-size: 0.95rem;
}

.card-moderno code,
.servico-card code {
  background: var(--bg-dark);
  padding: 1px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.85em;
  color: var(--primary);
  border: 1px solid var(--border);
}

.tag {
  display: inline-block;
  align-self: flex-start;
  background: rgba(52, 152, 219, 0.12);
  color: var(--primary);
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 1.2rem;
}

.project-link {
  margin-top: auto;
  padding-top: 1.8rem;
  color: var(--primary);
  font-size: 0.9rem;
  font-weight: 600;
  transition: var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.project-link:hover { color: #5dade2; transform: translateX(4px); }

.servico-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(52, 152, 219, 0.12);
  color: var(--primary);
  border-radius: var(--radius-md);
  margin-bottom: 1.4rem;
}
.servico-icon svg { width: 24px; height: 24px; }

.mini-card { padding: 1.5rem; border-radius: var(--radius-md); }
.mini-card h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 0.5rem;
}
.mini-card p { font-size: 0.9rem; color: var(--text-dim); }
.mini-card p code {
  background: var(--bg-dark);
  padding: 1px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.85em;
  color: var(--primary);
  border: 1px solid var(--border);
}

/* ---------- Sobre ---------- */
.sobre-grid {
  display: grid;
  grid-template-columns: 260px 1.4fr 1fr;
  gap: 3rem;
  align-items: start;
}

@media (max-width: 1100px) {
  .sobre-grid {
    grid-template-columns: 1fr 1fr;
  }
  .sobre-photo-wrap {
    grid-column: 1 / -1;
    margin-bottom: 1rem;
  }
}

@media (max-width: 900px) {
  .sobre-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .sobre-photo {
    max-width: 220px;
  }
}

.sobre-text p {
  color: var(--text-dim);
  font-size: 1.05rem;
  margin-bottom: 1.4rem;
  text-align: justify;
}
.sobre-text strong { color: var(--primary); font-weight: 600; }
.sobre-text em { color: var(--text-main); font-style: italic; }

.sobre-skills h3 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
  color: var(--text-main);
}

.skill-tags { display: flex; flex-wrap: wrap; gap: 8px; }

.skill-tag {
  display: inline-block;
  background: var(--bg-card);
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--primary);
  font-size: 0.85rem;
  font-weight: 600;
  transition: var(--transition-fast);
}
.skill-tag:hover { background: var(--bg-elevated); transform: translateX(4px); }

/* ---------- Ensino ---------- */
.module-index {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
  counter-reset: mod;
}
.module-index li {
  counter-increment: mod;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.2rem 1.4rem;
  transition: var(--transition-fast);
}
.module-index li::before {
  content: counter(mod, decimal-leading-zero);
  display: inline-block;
  color: var(--primary);
  font-weight: 800;
  font-size: 0.85rem;
  margin-right: 12px;
}
.module-index li:hover {
  border-color: var(--primary);
  transform: translateX(4px);
}
.module-index a { font-weight: 600; }

.content-block { max-width: 860px; margin: 0 auto; }

.content-block h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin: 2.2rem 0 1rem;
  color: var(--text-main);
  letter-spacing: -0.3px;
}
.content-block h3:first-child { margin-top: 0; }

.content-block h4 {
  font-size: 1rem;
  font-weight: 600;
  margin: 1.4rem 0 0.6rem;
  color: var(--primary);
}

.content-block p { color: var(--text-dim); margin-bottom: 1rem; }
.content-block p strong { color: var(--text-main); }
.content-block p em { color: var(--primary); font-style: normal; font-weight: 600; }

.bullet-list { margin: 0.8rem 0 1.2rem 0; }
.bullet-list li {
  position: relative;
  padding-left: 1.6rem;
  margin-bottom: 0.6rem;
  color: var(--text-dim);
}
.bullet-list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: 700;
}
.bullet-list code,
.content-block code {
  background: var(--bg-card);
  padding: 2px 8px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.85em;
  color: var(--primary);
  border: 1px solid var(--border);
}

.formula-box {
  background: linear-gradient(135deg, rgba(52, 152, 219, 0.08), rgba(52, 152, 219, 0.02));
  border: 1px solid rgba(52, 152, 219, 0.25);
  border-radius: var(--radius-md);
  padding: 1.6rem;
  text-align: center;
  margin: 1.5rem 0;
  font-size: 1.1rem;
}
.formula-box strong { color: var(--primary); }

.callout {
  background: rgba(52, 152, 219, 0.06);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: 1.2rem 1.4rem;
  margin: 1.5rem 0;
  color: var(--text-dim);
  font-size: 0.95rem;
}
.callout strong { color: var(--primary); }
.callout code {
  background: var(--bg-card);
  padding: 2px 8px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.85em;
  color: var(--text-main);
}
.callout em { color: var(--primary); font-style: normal; font-weight: 600; }

.code-block {
  background: #0a0a0a;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.4rem 1.6rem;
  overflow-x: auto;
  margin: 1rem 0;
}
.code-block pre { margin: 0; }
.code-block code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: #e6e6e6;
  line-height: 1.7;
  background: none;
  border: none;
  padding: 0;
}

.precedence {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 1rem 0 1.5rem;
}
.precedence span {
  background: var(--bg-card);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  border: 1px solid var(--border);
  color: var(--text-dim);
}

.table-wrap { overflow-x: auto; margin: 1rem 0 1.5rem; }
.table-wrap table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  font-size: 0.9rem;
}
.table-wrap th, .table-wrap td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.table-wrap th {
  background: rgba(52, 152, 219, 0.1);
  color: var(--primary);
  font-weight: 700;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.table-wrap td { color: var(--text-dim); }
.table-wrap tr:last-child td { border-bottom: none; }
.table-wrap tr:hover td { background: rgba(255, 255, 255, 0.02); }
.table-wrap code {
  background: rgba(52, 152, 219, 0.1);
  padding: 2px 8px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.9em;
  color: var(--primary);
}

/* ---------- Disciplinas ---------- */
.disciplinas-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 2rem;
}

.disciplina-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.2rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.disciplina-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), #5dade2);
}

.disciplina-card:hover {
  border-color: var(--primary);
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}

.disciplina-badge {
  display: inline-block;
  align-self: flex-start;
  padding: 5px 14px;
  background: rgba(52, 152, 219, 0.12);
  color: var(--primary);
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  margin-bottom: 0.8rem;
}

.disciplina-header h3 {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.4px;
  margin-bottom: 1rem;
  color: var(--text-main);
}

.disciplina-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 0.8rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}
.disciplina-meta span {
  background: var(--bg-alt);
  padding: 4px 10px;
  border-radius: 4px;
  border: 1px solid var(--border);
}

.disciplina-cursos {
  font-size: 0.85rem;
  color: var(--text-dim);
  line-height: 1.5;
}
.disciplina-cursos strong { color: var(--primary); }

.disciplina-card .module-index { grid-template-columns: 1fr; gap: 0.5rem; }
.disciplina-card .module-index li { padding: 0.8rem 1rem; font-size: 0.9rem; }

.disciplina-actions { margin-top: auto; padding-top: 0.5rem; }

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.4rem;
}

.info-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.6rem 1.8rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.info-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 3px;
  height: 100%;
  background: var(--primary);
}

.info-card:hover {
  border-color: var(--primary);
  background: var(--bg-elevated);
  transform: translateY(-4px);
}

.info-card h3 {
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--primary);
  margin-bottom: 1rem;
}

.info-card .bullet-list li {
  font-size: 0.9rem;
  margin-bottom: 0.4rem;
  padding-left: 1.2rem;
}
.info-card .bullet-list li::before { content: '→'; font-size: 0.85rem; }

.info-card p { font-size: 0.9rem; color: var(--text-dim); line-height: 1.6; }
.info-card p strong { color: var(--primary); }

/* ---------- AULAS ---------- */
.aulas-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.8rem;
}

.aula-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.8rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.aula-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), #5dade2);
}

.aula-card:hover {
  border-color: var(--primary);
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}

.aula-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.aula-badge {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(52, 152, 219, 0.12);
  color: var(--primary);
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.aula-disciplina {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
  text-align: right;
}

.aula-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.4px;
  color: var(--text-main);
  line-height: 1.3;
}

.aula-card p {
  color: var(--text-dim);
  font-size: 0.92rem;
  line-height: 1.55;
}

.aula-card p code {
  background: var(--bg-dark);
  padding: 1px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.85em;
  color: var(--primary);
}

.aula-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin: 0.4rem 0 0.8rem;
  padding: 0;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.aula-meta li {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  background: var(--bg-alt);
  border-radius: 4px;
  border: 1px solid var(--border);
}
.aula-meta li strong { color: var(--primary); }

.aula-card .btn { margin-top: auto; }

.aula-card-soon { opacity: 0.6; }
.aula-card-soon::before { background: linear-gradient(90deg, var(--text-muted), transparent); }
.aula-card-soon:hover {
  transform: none;
  border-color: var(--border);
  box-shadow: none;
}
.aula-card-soon .aula-badge {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-muted);
}

.btn-disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* ---------- Contacto ---------- */
.contacto-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 3rem;
  align-items: start;
}

.contacto-info h2,
.contacto-form h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1.8rem;
  letter-spacing: -0.5px;
}

.info-item { display: flex; gap: 1rem; margin-bottom: 1.6rem; }
.info-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(52, 152, 219, 0.12);
  color: var(--primary);
  border-radius: var(--radius-md);
}
.info-icon svg { width: 20px; height: 20px; }
.info-item h3 {
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  margin-bottom: 0.3rem;
}
.info-item p, .info-item a { color: var(--text-dim); font-size: 0.95rem; }
.info-item a:hover { color: var(--primary); }

.contacto-form {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
}

.form-group { margin-bottom: 1.4rem; }

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-dark);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-family: inherit;
  font-size: 0.95rem;
  transition: var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.form-group textarea { resize: vertical; min-height: 120px; }

.form-group input.error,
.form-group select.error,
.form-group textarea.error { border-color: #e74c3c; }

.form-error {
  display: block;
  color: #e74c3c;
  font-size: 0.8rem;
  margin-top: 0.35rem;
  min-height: 1em;
}

.form-status {
  margin-top: 1rem;
  font-size: 0.9rem;
  text-align: center;
  min-height: 1.2em;
}
.form-status.success { color: #2ecc71; }
.form-status.error { color: #e74c3c; }

.hp-field {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
  opacity: 0;
  pointer-events: none;
}

/* ---------- CTA ---------- */
.cta-section {
  padding: 100px 5%;
  background:
    radial-gradient(circle at 50% 50%, rgba(52, 152, 219, 0.15), transparent 70%),
    var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.cta-content { max-width: 640px; margin: 0 auto; text-align: center; }
.cta-content h2 {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 1rem;
}
.cta-content p { color: var(--text-dim); margin-bottom: 2rem; }

/* ---------- Footer ---------- */
.site-footer {
  background: #0a0a0a;
  border-top: 1px solid var(--border);
  padding: 60px 5% 30px;
}

.footer-grid {
  max-width: var(--container-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-logo { font-size: 1.3rem; font-weight: 800; margin-bottom: 0.8rem; }
.footer-logo span { color: var(--primary); }
.footer-desc { color: var(--text-muted); font-size: 0.9rem; }

.site-footer h4 {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-main);
  margin-bottom: 1rem;
}
.site-footer ul li { margin-bottom: 0.6rem; }
.site-footer ul a {
  color: var(--text-muted);
  font-size: 0.9rem;
  transition: var(--transition-fast);
}
.site-footer ul a:hover { color: var(--primary); }

.footer-bottom {
  max-width: var(--container-max);
  margin: 0 auto;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ---------- Animações ---------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.25, 0.8, 0.25, 1),
              transform 0.8s cubic-bezier(0.25, 0.8, 0.25, 1);
  will-change: opacity, transform;
}
.reveal.visible { opacity: 1; transform: translateY(0); }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ---------- Responsivo ---------- */
@media (max-width: 900px) {
 .sobre-grid { grid-template-columns: 1fr; gap: 2.5rem; }
.sobre-photo-wrap { text-align: center; }
  .contacto-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 720px) {
  :root { --header-height: 62px; }

  .nav-toggle { display: flex; }

  .nav-menu {
    position: fixed;
    inset: var(--header-height) 0 auto 0;
    flex-direction: column;
    gap: 0;
    background: rgba(15, 15, 15, 0.98);
    backdrop-filter: blur(14px);
    padding: 1rem 5% 2rem;
    border-bottom: 1px solid var(--border);
    transform: translateY(-120%);
    transition: transform var(--transition);
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
  }
  .nav-menu.open { transform: translateY(0); }

  .nav-menu li { width: 100%; }
  .nav-menu a {
    display: block;
    padding: 1rem 0;
    font-size: 1rem;
    border-bottom: 1px solid var(--border);
  }
  .nav-menu a::after { display: none; }
  .nav-cta {
    margin-top: 1rem;
    text-align: center;
    border-bottom: none !important;
  }

  .section { padding: 70px 5%; }
  .hero { min-height: 90vh; padding-top: calc(var(--header-height) + 30px); }
  .hero-stats { gap: 1.8rem; margin-top: 2.5rem; }
  .hero-stats strong { font-size: 1.3rem; }
  .hero-meta { gap: 0.5rem; margin-top: 1.5rem; }
  .meta-pill { font-size: 0.72rem; padding: 5px 11px; }

  .card-moderno, .servico-card { padding: 1.8rem; }
  .contacto-form { padding: 1.8rem; }
  .info-card { padding: 1.3rem 1.4rem; }
  .aula-card { padding: 1.5rem 1.4rem; }
  .aula-disciplina { text-align: left; }

  .footer-grid { grid-template-columns: 1fr; gap: 2rem; text-align: center; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none; }
}
/* =========================================================
   FOTO DE PERFIL — Isac Daniel
   ========================================================= */

/* Hero — foto circular */
.hero-photo {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center top;
  border: 4px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.4),
              0 0 0 8px rgba(52, 152, 219, 0.08);
  margin: 0 auto 1.8rem;
  display: block;
  transition: transform 0.4s cubic-bezier(0.25, 0.8, 0.25, 1),
              box-shadow 0.4s ease;
}

.hero-photo:hover {
  transform: scale(1.04);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5),
              0 0 0 10px rgba(52, 152, 219, 0.12);
}

/* Sobre — foto retangular com moldura */
.sobre-photo {
  width: 100%;
  max-width: 320px;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  object-position: center top;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.sobre-photo:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

/* Contacto — foto pequena de perfil */
.contacto-photo {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center top;
  border: 3px solid var(--primary);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
  margin-bottom: 1.5rem;
}

/* Responsivo */
@media (max-width: 900px) {
  .sobre-photo {
    max-width: 240px;
    margin: 0 auto;
    display: block;
  }
}

@media (max-width: 720px) {
  .hero-photo {
    width: 130px;
    height: 130px;
    margin-bottom: 1.4rem;
  }
}

/* Legenda sob a foto em Sobre */
.sobre-photo-caption {
  text-align: center;
  margin-top: 0.9rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.4;
}
.sobre-photo-caption strong {
  color: var(--text-main);
  font-weight: 700;
  font-size: 0.92rem;
}
.sobre-photo-caption span {
  color: var(--primary);
  font-weight: 500;
}

/* Envolvente da foto em Sobre */
.sobre-photo-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* =========================================================
   PWA — Toast "Nova versão disponível"
   ========================================================= */

.pwa-update-toast {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translate(-50%, -120%);
  max-width: 460px;
  width: calc(100% - 32px);
  background: linear-gradient(135deg, #1a1a1a 0%, #202020 100%);
  border: 1px solid rgba(52, 152, 219, 0.4);
  border-radius: 16px;
  padding: 16px 18px;
  box-shadow:
    0 20px 50px rgba(0, 0, 0, 0.55),
    0 0 0 1px rgba(255, 255, 255, 0.03),
    0 0 60px rgba(52, 152, 219, 0.15);
  display: flex;
  flex-direction: column;
  gap: 14px;
  z-index: 10000;
  opacity: 0;
  transition: transform 0.5s cubic-bezier(0.25, 0.8, 0.25, 1),
              opacity 0.4s ease;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.pwa-update-toast.pwa-update-toast-show {
  transform: translate(-50%, 0);
  opacity: 1;
}

.pwa-update-content {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.pwa-update-icon {
  font-size: 1.6rem;
  line-height: 1;
  flex-shrink: 0;
  animation: pwa-sparkle 2s ease-in-out infinite;
}

@keyframes pwa-sparkle {
  0%, 100% { transform: scale(1) rotate(0deg); }
  50%      { transform: scale(1.15) rotate(-8deg); }
}

.pwa-update-text {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.pwa-update-text strong {
  font-size: 0.95rem;
  font-weight: 700;
  color: #f5f5f5;
  letter-spacing: -0.2px;
}

.pwa-update-text span {
  font-size: 0.82rem;
  color: #b0b0b0;
  line-height: 1.45;
}

.pwa-update-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

/* Responsivo */
@media (max-width: 400px) {
  .pwa-update-toast {
    padding: 14px;
    gap: 12px;
  }
  .pwa-update-text strong { font-size: 0.9rem; }
  .pwa-update-text span { font-size: 0.78rem; }
  .pwa-update-actions { flex-direction: column-reverse; }
  .pwa-update-actions .pwa-btn { width: 100%; text-align: center; }
}

/* Respeitar reduced motion */
@media (prefers-reduced-motion: reduce) {
  .pwa-update-toast { transition: opacity 0.2s ease; }
  .pwa-update-icon { animation: none; }
}