/* =========================================================
   Química Orgânica II — IFRO Ji-Paraná
   Tema: Científico Moderno (dark, petróleo + aqua)
   ========================================================= */

:root{
  --bg: #0b1220;
  --bg-alt: #0f172a;
  --surface: #111c30;
  --surface-2: #16223b;
  --border: #223054;
  --text: #e6edf7;
  --text-muted: #9fb0c9;
  --accent: #2dd4bf;      /* aqua/teal */
  --accent-2: #38bdf8;    /* sky blue */
  --accent-3: #a78bfa;    /* violet, detalhes */
  --success: #4ade80;
  --danger: #f87171;
  --warning: #fbbf24;
  --radius: 14px;
  --shadow: 0 8px 30px rgba(0,0,0,0.35);
  --font-body: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
  --maxw: 1120px;
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }

body{
  margin: 0;
  font-family: var(--font-body);
  background:
    radial-gradient(1200px 600px at 85% -10%, rgba(45,212,191,0.12), transparent 60%),
    radial-gradient(900px 500px at -10% 10%, rgba(56,189,248,0.10), transparent 55%),
    var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

a{ color: var(--accent); text-decoration: none; }
a:hover{ color: var(--accent-2); }

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

.container{
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- NAV ---------- */
.site-header{
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11,18,32,0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav{
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  position: relative;
}
.brand{
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  color: var(--text);
  font-size: 1.05rem;
}
.brand .mol{
  width: 34px; height: 34px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
  box-shadow: 0 0 18px rgba(45,212,191,0.45);
}
.brand small{ display:block; font-weight: 400; color: var(--text-muted); font-size: 0.72rem; }

.nav-links{
  display: flex;
  gap: 4px;
  align-items: center;
  flex-wrap: wrap;
}
.nav-links a{
  color: var(--text-muted);
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 500;
  transition: all .15s ease;
}
.nav-links a:hover{ color: var(--text); background: var(--surface-2); }
.nav-links a.active{ color: var(--bg); background: var(--accent); }

.nav-toggle{
  display: none;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 8px 10px;
  cursor: pointer;
}

@media (max-width: 880px){
  .nav-toggle{ display: block; }
  .nav-links{
    display: none;
    position: absolute;
    top: 64px; left: 0; right: 0;
    background: var(--bg-alt);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: stretch;
    padding: 10px 16px 16px;
  }
  .nav-links.open{ display: flex; }
  .nav-links a{ padding: 12px 14px; }
}

/* ---------- HERO ---------- */
.hero{
  padding: 72px 0 56px;
  text-align: center;
}
.hero .eyebrow{
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 18px;
}
.hero h1{
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  margin: 0 0 16px;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(90deg, var(--text), var(--accent-2) 70%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero p.lead{
  max-width: 680px;
  margin: 0 auto 28px;
  color: var(--text-muted);
  font-size: 1.05rem;
}
.hero-actions{
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .15s ease, box-shadow .15s ease;
}
.btn:hover{ transform: translateY(-1px); }
.btn-primary{
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #04121a;
  box-shadow: 0 6px 20px rgba(45,212,191,0.28);
}
.btn-primary:hover{ color: #04121a; }
.btn-ghost{
  background: var(--surface-2);
  color: var(--text);
  border-color: var(--border);
}
.btn-ghost:hover{ color: var(--text); border-color: var(--accent); }
.btn-sm{ padding: 8px 14px; font-size: 0.85rem; }

/* ---------- SECTIONS / CARDS ---------- */
section{ padding: 48px 0; }
.section-title{
  font-size: 1.6rem;
  font-weight: 700;
  margin: 0 0 6px;
}
.section-sub{
  color: var(--text-muted);
  margin: 0 0 32px;
  max-width: 640px;
}

.grid{
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.card{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
  transition: border-color .15s ease, transform .15s ease;
}
.card:hover{ border-color: var(--accent); transform: translateY(-2px); }

.topic-card{
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.topic-card h3{ margin: 0; font-size: 1.05rem; }
.topic-card p{ margin: 0; color: var(--text-muted); font-size: 0.9rem; }
.topic-card .tags{ display: flex; gap: 8px; flex-wrap: wrap; margin-top: 6px; }
.tag{
  font-size: 0.72rem;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--accent);
  border: 1px solid var(--border);
}

.tool-card{
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  max-width: 380px;
}
.tool-card h3{ margin: 0; font-size: 1.1rem; }
.tool-card p{ margin: 0; color: var(--text-muted); font-size: 0.9rem; }

/* Tag de categoria (substitui os ícones dos cards) */
.cat-tag{
  display: inline-block;
  align-self: flex-start;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: 999px;
  border: 1px solid transparent;
}
.cat-tag.violet{
  background: rgba(167,139,250,0.12);
  color: var(--accent-3);
  border-color: rgba(167,139,250,0.3);
}
.cat-tag.teal{
  background: rgba(45,212,191,0.12);
  color: var(--accent);
  border-color: rgba(45,212,191,0.3);
}
.cat-tag.blue{
  background: rgba(56,189,248,0.12);
  color: var(--accent-2);
  border-color: rgba(56,189,248,0.3);
}
.cat-tag.amber{
  background: rgba(251,191,36,0.12);
  color: var(--warning);
  border-color: rgba(251,191,36,0.3);
}
.cat-tag.green{
  background: rgba(74,222,128,0.12);
  color: var(--success);
  border-color: rgba(74,222,128,0.3);
}

/* ---------- TOPIC SELECTOR (flashcards/quiz/videos) ---------- */
.topic-selector{
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}
.topic-chip{
  padding: 9px 16px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .15s ease;
}
.topic-chip:hover{ border-color: var(--accent); color: var(--text); }
.topic-chip.active{
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #04121a;
  border-color: transparent;
}

/* ---------- FLASHCARDS ---------- */
.flash-wrap{ max-width: 620px; margin: 0 auto; }
.flash-progress{
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 14px; color: var(--text-muted); font-size: 0.85rem;
}
.flashcard{
  perspective: 1400px;
  height: 280px;
  margin-bottom: 22px;
  cursor: pointer;
}
.flashcard-inner{
  position: relative;
  width: 100%; height: 100%;
  transition: transform 0.5s cubic-bezier(.4,.2,.2,1);
  transform-style: preserve-3d;
}
.flashcard.flipped .flashcard-inner{ transform: rotateY(180deg); }
.flash-face{
  position: absolute; inset: 0;
  backface-visibility: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center;
  padding: 32px;
  background: var(--surface);
  box-shadow: var(--shadow);
}
.flash-face.front{ background: linear-gradient(160deg, var(--surface), var(--surface-2)); }
.flash-face.back{
  transform: rotateY(180deg);
  background: linear-gradient(160deg, #123b38, var(--surface));
  border-color: var(--accent);
}
.flash-face .label{
  position: absolute; top: 14px; left: 18px;
  font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--text-muted);
}
.flash-face .txt{ font-size: 1.15rem; font-weight: 600; }
.flash-face .hint{ margin-top: 14px; font-size: 0.78rem; color: var(--text-muted); }
.flash-controls{
  display: flex; justify-content: center; gap: 10px; flex-wrap: wrap;
}

/* ---------- QUIZ ---------- */
.quiz-wrap{ max-width: 680px; margin: 0 auto; }
.quiz-progress-bar{
  height: 6px; border-radius: 999px; background: var(--surface-2);
  overflow: hidden; margin-bottom: 24px;
}
.quiz-progress-fill{
  height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width .3s ease;
}
.quiz-question{ font-size: 1.15rem; font-weight: 700; margin-bottom: 20px; }
.quiz-options{ display: flex; flex-direction: column; gap: 10px; margin-bottom: 22px; }
.quiz-option{
  text-align: left;
  padding: 14px 16px;
  border-radius: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  cursor: pointer;
  font-size: 0.95rem;
  transition: all .15s ease;
}
.quiz-option:hover{ border-color: var(--accent-2); }
.quiz-option.correct{ border-color: var(--success); background: rgba(74,222,128,0.12); }
.quiz-option.incorrect{ border-color: var(--danger); background: rgba(248,113,113,0.12); }
.quiz-option:disabled{ cursor: default; }
.quiz-explain{
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}
.quiz-score{
  text-align: center;
  padding: 40px 20px;
}
.quiz-score .big{ font-size: 3rem; font-weight: 800; color: var(--accent); }

/* ---------- VIDEOS ---------- */
.video-grid{
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}
.video-card{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.video-card .frame-wrap{ position: relative; padding-top: 56.25%; background: #000; }
.video-card iframe{ position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.video-card .meta{ padding: 16px 18px; }
.video-card .meta h4{ margin: 0 0 6px; font-size: 1rem; }
.video-card .meta p{ margin: 0; color: var(--text-muted); font-size: 0.85rem; }
.video-card .meta .channel{ color: var(--accent); font-size: 0.78rem; font-weight: 600; margin-top: 8px; display: block; }

/* ---------- PRÁTICAS ---------- */
.practical-block{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  margin-bottom: 20px;
}
.practical-block h3{ margin-top: 0; color: var(--accent-2); }
.practical-block .data{
  background: var(--surface-2);
  border-left: 3px solid var(--accent);
  padding: 12px 16px;
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  margin: 14px 0;
  white-space: pre-wrap;
}
details.solution{
  margin-top: 14px;
  border-top: 1px dashed var(--border);
  padding-top: 12px;
}
details.solution summary{
  cursor: pointer;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
}
details.solution[open] summary{ margin-bottom: 10px; }

/* ---------- AUTOR ---------- */
.author-hero{
  display: flex;
  gap: 36px;
  align-items: center;
  flex-wrap: wrap;
  padding: 40px 0;
}
.author-photo{
  width: 220px; height: 220px;
  border-radius: 20px;
  object-fit: cover;
  border: 2px solid var(--border);
  box-shadow: var(--shadow);
}
.author-info h1{ margin: 0 0 6px; font-size: 1.9rem; }
.author-info .role{ color: var(--accent); font-weight: 600; margin-bottom: 14px; }
.author-info p{ color: var(--text-muted); max-width: 560px; }
.author-links{ display: flex; gap: 10px; margin-top: 16px; flex-wrap: wrap; }

/* ---------- FOOTER ---------- */
.site-footer{
  border-top: 1px solid var(--border);
  padding: 32px 0;
  margin-top: 40px;
  color: var(--text-muted);
  font-size: 0.85rem;
  text-align: center;
}
.site-footer a{ color: var(--text-muted); }
.site-footer a:hover{ color: var(--accent); }

/* ---------- Utilities ---------- */
.empty-state{
  text-align: center;
  padding: 40px 20px;
  color: var(--text-muted);
}
.badge{
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 700;
  background: var(--surface-2);
  color: var(--accent);
  border: 1px solid var(--border);
}