/* ============================================================
   ACADEMIA · MATEMÁTICA FINANCEIRA
   Design inspirado em Claude — cremas cálidos, coral, serifa elegante
   ============================================================ */

:root {
  /* Paleta clara (Claude-like) */
  --bg: #FAF9F5;
  --bg-elev: #FFFFFF;
  --bg-soft: #F4F1EA;
  --bg-tint: #EFE9DC;
  --border: #E8E2D4;
  --border-strong: #D9D1BE;
  --text: #1F1E1C;
  --text-soft: #5C574C;
  --text-mute: #8A8273;
  --accent: #C96442;      /* coral terracota */
  --accent-soft: #E58563;
  --accent-bg: #F5E6DF;
  --accent-deep: #A04A2E;
  --green: #5C7E5C;
  --green-bg: #E4ECDE;
  --red: #B14F47;
  --red-bg: #F4DDD9;
  --gold: #B68A3D;
  --shadow-sm: 0 1px 2px rgba(31, 30, 28, 0.04), 0 1px 1px rgba(31, 30, 28, 0.03);
  --shadow-md: 0 4px 16px rgba(31, 30, 28, 0.06), 0 1px 3px rgba(31, 30, 28, 0.04);
  --shadow-lg: 0 12px 40px rgba(31, 30, 28, 0.08), 0 4px 12px rgba(31, 30, 28, 0.04);
  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
}

[data-theme="dark"] {
  --bg: #26231F;
  --bg-elev: #2F2B26;
  --bg-soft: #322E28;
  --bg-tint: #3A352E;
  --border: #403A32;
  --border-strong: #4F4840;
  --text: #F5F1E9;
  --text-soft: #C5BFB1;
  --text-mute: #8E867A;
  --accent: #E58563;
  --accent-soft: #ECA083;
  --accent-bg: #4A2F25;
  --accent-deep: #F0A07E;
  --green: #9DBA8B;
  --green-bg: #34402F;
  --red: #D88B82;
  --red-bg: #4A302C;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.35);
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background 0.3s ease, color 0.3s ease;
  min-height: 100vh;
}

/* ============== NAV ============== */
.topnav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 40px;
  background: rgba(250, 249, 245, 0.85);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border);
}
[data-theme="dark"] .topnav { background: rgba(38, 35, 31, 0.85); }

.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 38px; height: 38px;
  display: grid; place-items: center;
  background: var(--accent);
  color: #fff;
  border-radius: 10px;
  box-shadow: var(--shadow-sm);
}
.brand-mark svg { width: 22px; height: 22px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-title {
  font-family: 'Fraunces', serif;
  font-weight: 600;
  font-size: 17px;
  color: var(--text);
}
.brand-sub {
  font-size: 11px;
  color: var(--text-mute);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  gap: 4px;
  list-style: none;
  background: var(--bg-soft);
  padding: 4px;
  border-radius: 12px;
  border: 1px solid var(--border);
}
.nav-link {
  padding: 8px 16px;
  border-radius: 8px;
  color: var(--text-soft);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s ease;
}
.nav-link:hover { color: var(--text); background: var(--bg-tint); }
.nav-link.active {
  background: var(--bg-elev);
  color: var(--accent);
  box-shadow: var(--shadow-sm);
}

.theme-toggle {
  width: 38px; height: 38px;
  display: grid; place-items: center;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text-soft);
  cursor: pointer;
  transition: all 0.2s ease;
}
.theme-toggle:hover { background: var(--bg-tint); color: var(--accent); }
.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

/* ============== SECTION FRAME ============== */
.section {
  display: none;
  max-width: 1180px;
  margin: 0 auto;
  padding: 60px 40px 100px;
  animation: fadeUp 0.5s ease;
}
.section.active { display: block; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.section-head { max-width: 720px; margin-bottom: 50px; }
.eyebrow {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 14px;
}
.section-title {
  font-family: 'Fraunces', serif;
  font-weight: 500;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 16px;
}
.section-lead {
  font-size: 18px;
  color: var(--text-soft);
  line-height: 1.6;
}

.sub-title {
  font-family: 'Fraunces', serif;
  font-weight: 500;
  font-size: 24px;
  margin-top: 40px;
  margin-bottom: 6px;
  color: var(--text);
}
.sub-lead {
  color: var(--text-soft);
  margin-bottom: 20px;
}

/* ============== HERO ============== */
.hero {
  max-width: 820px;
  margin: 0 auto 80px;
  text-align: center;
  padding-top: 40px;
}
.hero-title {
  font-family: 'Fraunces', serif;
  font-weight: 400;
  font-size: clamp(38px, 6vw, 64px);
  line-height: 1.08;
  letter-spacing: -0.025em;
  color: var(--text);
  margin: 20px 0 24px;
}
.hero-title em {
  font-style: italic;
  color: var(--accent);
  font-weight: 500;
}
.hero-lead {
  font-size: 19px;
  color: var(--text-soft);
  line-height: 1.6;
  max-width: 640px;
  margin: 0 auto 36px;
}
.hero-cta {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 60px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 720px;
  margin: 0 auto;
}
.stat-card {
  padding: 24px 16px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}
.stat-num {
  font-family: 'Fraunces', serif;
  font-size: 36px;
  font-weight: 500;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 6px;
}
.stat-label {
  font-size: 12px;
  color: var(--text-mute);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.hero-modules { margin-top: 80px; }
.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
  margin-top: 28px;
}
.module-card {
  display: block;
  padding: 28px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: inherit;
  transition: all 0.25s ease;
  cursor: pointer;
}
.module-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-soft);
}
.mod-ico { font-size: 32px; margin-bottom: 14px; }
.module-card h3 {
  font-family: 'Fraunces', serif;
  font-weight: 500;
  font-size: 20px;
  margin-bottom: 8px;
  color: var(--text);
}
.module-card p {
  font-size: 14px;
  color: var(--text-soft);
  line-height: 1.55;
  margin-bottom: 16px;
}
.mod-arrow {
  font-size: 13px;
  color: var(--accent);
  font-weight: 500;
}

/* ============== BUTTONS ============== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  border-radius: 10px;
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover {
  background: var(--accent-deep);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border-strong);
}
.btn-ghost:hover { background: var(--bg-soft); border-color: var(--accent); color: var(--accent); }
.btn-block { width: 100%; padding: 14px; }

/* ============== TEORIA ============== */
.concepts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  margin-bottom: 32px;
}
.concept {
  padding: 22px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  position: relative;
  transition: all 0.2s ease;
}
.concept:hover { border-color: var(--accent-soft); transform: translateY(-2px); }
.concept-key {
  display: inline-block;
  font-family: 'Fraunces', serif;
  font-size: 28px;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 8px;
  line-height: 1;
}
.concept h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text);
}
.concept p {
  font-size: 13.5px;
  color: var(--text-soft);
  line-height: 1.5;
}

.rule-box {
  padding: 22px 26px;
  background: var(--accent-bg);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  margin-bottom: 40px;
}
.rule-tag {
  display: inline-block;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-deep);
  font-weight: 700;
  margin-bottom: 8px;
}
.rule-box p { color: var(--text); font-size: 15.5px; }

.formula-table {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 28px;
}
.frow {
  display: grid;
  grid-template-columns: 1.2fr 2fr;
  padding: 14px 22px;
  border-bottom: 1px solid var(--border);
  align-items: center;
}
.frow:last-child { border-bottom: none; }
.frow.head {
  background: var(--bg-soft);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-mute);
  font-weight: 600;
}
.frow > div:first-child { color: var(--text-soft); font-weight: 500; }
.fcell code {
  font-family: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
  font-size: 15px;
  color: var(--accent-deep);
  background: var(--accent-bg);
  padding: 4px 10px;
  border-radius: 6px;
}

.conv-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
}
.conv {
  padding: 16px 20px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
.conv span { color: var(--text-soft); font-size: 14px; }
.conv code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: var(--accent-deep);
  background: var(--accent-bg);
  padding: 3px 8px;
  border-radius: 5px;
}

/* ============== CALCULADORA ============== */
.calc-shell {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 24px;
}
@media (max-width: 880px) { .calc-shell { grid-template-columns: 1fr; } }

.calc-form {
  padding: 28px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  height: fit-content;
  position: sticky;
  top: 90px;
}
.field { margin-bottom: 18px; }
.field label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-soft);
  margin-bottom: 8px;
}
.field input,
.field select {
  width: 100%;
  padding: 11px 14px;
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  font-family: inherit;
  font-size: 15px;
  color: var(--text);
  transition: all 0.2s ease;
}
.field input:focus,
.field select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-bg);
}
.input-row { display: grid; grid-template-columns: 1fr 1.1fr; gap: 8px; }
.hint {
  font-size: 12px;
  color: var(--text-mute);
  margin-top: 12px;
  line-height: 1.5;
}

.calc-results {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
@media (max-width: 640px) { .calc-results { grid-template-columns: 1fr; } }

.result-card {
  padding: 26px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
}
.result-card.simples { border-top: 3px solid var(--text-mute); }
.result-card.composto {
  border-top: 3px solid var(--accent);
  background: linear-gradient(180deg, var(--accent-bg) 0%, var(--bg-elev) 100%);
}
.rc-head { margin-bottom: 16px; }
.rc-tag {
  display: inline-block;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-mute);
  font-weight: 600;
  margin-bottom: 4px;
}
.rc-head h3 {
  font-family: 'Fraunces', serif;
  font-weight: 500;
  font-size: 22px;
  color: var(--text);
}
.rc-big {
  font-family: 'Fraunces', serif;
  font-size: 32px;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 20px;
  line-height: 1.1;
}
.result-card.composto .rc-big { color: var(--accent-deep); }
.rc-grid { display: flex; flex-direction: column; gap: 10px; }
.rc-grid > div {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  border-bottom: 1px dashed var(--border);
}
.rc-grid > div:last-child { border-bottom: none; }
.rc-grid span { color: var(--text-mute); font-size: 13px; }
.rc-grid strong { font-size: 14px; color: var(--text); font-weight: 500; }

.diff-card {
  grid-column: 1 / -1;
  padding: 24px 28px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}
.diff-card p {
  font-size: 16px;
  color: var(--text-soft);
  margin: 6px 0 18px;
}
.diff-card strong { color: var(--accent); font-weight: 600; }
.bars { display: flex; flex-direction: column; gap: 10px; }
.bar-row { display: grid; grid-template-columns: 80px 1fr 110px; align-items: center; gap: 12px; font-size: 13px; color: var(--text-soft); }
.bar-row span:last-child { text-align: right; color: var(--text); font-weight: 500; }
.bar {
  height: 24px;
  background: var(--bg);
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid var(--border);
}
.bar-fill {
  height: 100%;
  border-radius: 5px;
  transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}
.bar-s { background: var(--text-mute); }
.bar-c { background: var(--accent); }

/* ============== EXERCICIOS ============== */
.ex-progress {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 22px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 24px;
}
.ex-progress span { font-size: 14px; color: var(--text-soft); white-space: nowrap; }
.ex-progress strong { color: var(--accent); }
.progress-bar {
  flex: 1;
  height: 8px;
  background: var(--bg-soft);
  border-radius: 4px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-soft));
  border-radius: 4px;
  transition: width 0.4s ease;
}

.ex-list { display: flex; flex-direction: column; gap: 12px; }

.ex-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all 0.2s ease;
}
.ex-card:hover { border-color: var(--border-strong); }
.ex-card.done { border-color: var(--green); }
.ex-card.open { box-shadow: var(--shadow-md); }

.ex-head {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 24px;
  cursor: pointer;
  user-select: none;
}
.ex-num {
  width: 36px; height: 36px;
  display: grid; place-items: center;
  background: var(--accent-bg);
  color: var(--accent-deep);
  font-family: 'Fraunces', serif;
  font-weight: 600;
  border-radius: 8px;
  flex-shrink: 0;
}
.ex-card.done .ex-num { background: var(--green-bg); color: var(--green); }
.ex-title { flex: 1; font-size: 15px; color: var(--text); line-height: 1.5; }
.ex-chev {
  width: 22px; height: 22px;
  color: var(--text-mute);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}
.ex-card.open .ex-chev { transform: rotate(180deg); color: var(--accent); }

.ex-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.ex-card.open .ex-body { max-height: 2400px; }

.ex-content { padding: 8px 24px 24px; border-top: 1px solid var(--border); padding-top: 22px; }
.ex-content h5 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-mute);
  font-weight: 600;
  margin: 18px 0 10px;
}
.ex-content h5:first-child { margin-top: 0; }
.ex-content p, .ex-content li {
  font-size: 14.5px;
  color: var(--text-soft);
  line-height: 1.65;
}
.ex-content ul { padding-left: 22px; margin-bottom: 10px; }
.ex-content code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13.5px;
  color: var(--accent-deep);
  background: var(--accent-bg);
  padding: 2px 7px;
  border-radius: 5px;
}
.ex-steps {
  background: var(--bg-soft);
  padding: 16px 20px;
  border-radius: 10px;
  border-left: 3px solid var(--accent);
}
.ex-steps ol { padding-left: 22px; }
.ex-steps li { margin-bottom: 8px; }
.ex-answer {
  margin-top: 16px;
  padding: 16px 20px;
  background: var(--green-bg);
  border-radius: 10px;
  border-left: 3px solid var(--green);
}
.ex-answer p { color: var(--text); font-weight: 500; }
.ex-answer strong { color: var(--green); }

.ex-actions { display: flex; gap: 10px; margin-top: 18px; }
.ex-mark {
  padding: 9px 18px;
  background: transparent;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  font-family: inherit;
  font-size: 13px;
  color: var(--text-soft);
  cursor: pointer;
  transition: all 0.2s ease;
}
.ex-mark:hover { border-color: var(--green); color: var(--green); }
.ex-card.done .ex-mark { background: var(--green-bg); border-color: var(--green); color: var(--green); }

/* ============== QUIZ ============== */
.quiz-shell {
  max-width: 760px;
  margin: 0 auto;
}
.quiz-header { margin-bottom: 20px; }
.quiz-meta {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-mute);
  margin-bottom: 10px;
}
.quiz-meta strong { color: var(--accent); }

.quiz-card {
  padding: 36px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  animation: fadeUp 0.35s ease;
}
.q-text {
  font-family: 'Fraunces', serif;
  font-weight: 500;
  font-size: 22px;
  line-height: 1.4;
  color: var(--text);
  margin-bottom: 26px;
}

.q-options { display: flex; flex-direction: column; gap: 10px; margin-bottom: 18px; }
.q-option {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 20px;
  background: var(--bg);
  border: 1.5px solid var(--border-strong);
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 15px;
  color: var(--text);
  text-align: left;
  font-family: inherit;
  width: 100%;
}
.q-option:hover:not(.disabled) {
  border-color: var(--accent);
  background: var(--accent-bg);
}
.q-option .opt-letter {
  width: 28px; height: 28px;
  flex-shrink: 0;
  display: grid; place-items: center;
  background: var(--bg-soft);
  border-radius: 8px;
  font-weight: 600;
  font-size: 13px;
  color: var(--text-soft);
  transition: all 0.2s ease;
}
.q-option.selected { border-color: var(--accent); background: var(--accent-bg); }
.q-option.selected .opt-letter { background: var(--accent); color: #fff; }
.q-option.correct { border-color: var(--green); background: var(--green-bg); }
.q-option.correct .opt-letter { background: var(--green); color: #fff; }
.q-option.wrong { border-color: var(--red); background: var(--red-bg); }
.q-option.wrong .opt-letter { background: var(--red); color: #fff; }
.q-option.disabled { cursor: default; }

.q-feedback {
  display: none;
  padding: 16px 20px;
  background: var(--bg-soft);
  border-radius: 12px;
  margin-bottom: 20px;
  font-size: 14.5px;
  color: var(--text-soft);
  line-height: 1.6;
  border-left: 3px solid var(--accent);
}
.q-feedback.show { display: block; animation: fadeUp 0.3s ease; }
.q-feedback strong { color: var(--text); }

.q-controls {
  display: flex;
  justify-content: space-between;
  gap: 10px;
}

.quiz-finish {
  padding: 50px 40px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow-md);
}
.quiz-finish h3 {
  font-family: 'Fraunces', serif;
  font-weight: 500;
  font-size: 26px;
  color: var(--text);
  margin-bottom: 18px;
}
.finish-score {
  font-family: 'Fraunces', serif;
  font-size: 72px;
  font-weight: 500;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 16px;
}
.quiz-finish p {
  color: var(--text-soft);
  font-size: 16px;
  margin-bottom: 28px;
}

/* ============== FOOTER ============== */
.footer {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  padding: 30px 20px;
  font-size: 13px;
  color: var(--text-mute);
  border-top: 1px solid var(--border);
}
.footer .dot { opacity: 0.5; }

/* ============== RESPONSIVE ============== */
@media (max-width: 768px) {
  .topnav { padding: 12px 18px; flex-wrap: wrap; gap: 10px; }
  .nav-links { order: 3; width: 100%; justify-content: space-between; overflow-x: auto; }
  .nav-link { padding: 7px 12px; font-size: 13px; white-space: nowrap; }
  .section { padding: 40px 20px 70px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .calc-form { position: static; }
  .quiz-card { padding: 26px 22px; }
  .frow { grid-template-columns: 1fr; gap: 6px; }
  .frow.head { display: none; }
}

/* ============== FOLHA DE FÓRMULAS (vertical, A4 em 1 página) ============== */
.formulary {
  background: #ffffff;
  color: #1a1a1a;
  padding: 22px 28px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 720px;
  max-width: 100%;
  margin: 0 auto;
  border: 1px solid var(--border);
  font-family: 'Inter', sans-serif;
  line-height: 1.4;
  box-sizing: border-box;
}

.form-block {
  margin-bottom: 14px;
}
.form-block:last-of-type {
  margin-bottom: 10px;
}

.form-h {
  font-family: 'Fraunces', serif;
  font-weight: 600;
  font-size: 17px;
  color: #1a1a1a;
  margin: 0 0 6px;
  padding: 4px 10px;
  background: #fef4ef;
  border-left: 4px solid #c96442;
  border-radius: 0 4px 4px 0;
  letter-spacing: -0.005em;
}

.form-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.form-table td {
  text-align: left;
  padding: 6px 12px;
  border: 1px solid #d8d2c4;
  vertical-align: middle;
}
.form-table tr:nth-child(odd) td { background: #faf9f5; }
.form-table td:first-child {
  color: #444;
  font-weight: 600;
  white-space: nowrap;
  width: 38%;
}
.form-table code {
  font-family: 'JetBrains Mono', 'Consolas', monospace;
  font-size: 13px;
  color: #a04a2e;
  background: transparent;
  padding: 0;
  font-weight: 500;
}

.form-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 10px;
  padding: 6px 10px;
  background: #fafaf7;
  border-radius: 4px;
  font-size: 11px;
  color: #555;
}
.form-bottom code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: #a04a2e;
  background: transparent;
  padding: 0;
  font-weight: 600;
}

@media (max-width: 720px) {
  .formulary { padding: 18px 16px; width: 100%; }
  .form-h { font-size: 15px; }
  .form-table { font-size: 12px; }
  .form-table td { padding: 5px 8px; }
}

/* Tema escuro: a folha sempre permanece clara (estilo papel) */
[data-theme="dark"] .formulary {
  background: #ffffff;
  color: #1a1a1a;
}

/* ============== IMPRESSÃO ============== */
@media print {
  body { background: #fff; }
  .topnav, .footer, .nav-links, .theme-toggle,
  .section-head .btn, .section-head .eyebrow,
  .section-head .section-title, .section-head .section-lead,
  .section-head > div { display: none !important; }
  .section { display: none !important; padding: 0 !important; }
  #formulario.section, .printing-formulary #formulario { display: block !important; }
  .formulary {
    box-shadow: none !important;
    border: none !important;
    padding: 0 !important;
    max-width: 100% !important;
  }
}