/* ============================================================
   Instituto Brasileiro de Derivativos — design tokens
   ============================================================ */

:root {
  /* Palette — Institutional Navy / Green / Cream / Gold
     Sampled from the IBD brand mark (Brazilian flag inspired). */
  --navy-900: #11213D;
  --navy-800: #1A2D4F;
  --navy-700: #243C66;
  --navy-600: #2F4C7E;
  --steel-500: #4A6B8E;
  --steel-300: #8BA0B8;
  --steel-200: #B8C6D6;
  --cream-50: #FAF8F0;
  --cream-100: #F4F0E4;
  --cream-200: #ECE4D2;
  --cream-300: #D8D0BB;
  --gold-500: #DBA21B;
  --gold-600: #C08D14;
  --gold-700: #997010;
  --green-700: #084F29;
  --green-600: #0B6633;
  --green-500: #1B8350;
  --ink-900: #15171A;
  --ink-700: #3B4147;
  --ink-500: #6A7077;
  --ink-300: #A3A8AE;
  --border: #DDD4BE;
  --border-strong: #B8AE93;
  --success: #084F29;
  --danger: #9C2A2A;

  /* Semantic — light mode */
  --bg: var(--cream-50);
  --bg-elev: #FFFFFF;
  --bg-sunken: var(--cream-100);
  --fg: var(--ink-900);
  --fg-muted: var(--ink-500);
  --fg-subtle: var(--ink-300);
  --primary: var(--navy-900);
  --primary-fg: var(--cream-50);
  --accent: var(--gold-500);
  --accent-fg: var(--navy-900);
  --secondary: var(--green-700);
  --rule: var(--border);
  --rule-strong: var(--border-strong);

  /* Typography */
  --font-serif: "Source Serif 4", "Source Serif Pro", Georgia, serif;
  --font-sans: "IBM Plex Sans", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;

  /* Scale */
  --step--1: 0.8125rem;
  --step-0: 0.9375rem;
  --step-1: 1.0625rem;
  --step-2: 1.25rem;
  --step-3: 1.5rem;
  --step-4: 1.875rem;
  --step-5: 2.5rem;
  --step-6: 3.25rem;
  --step-7: 4.25rem;

  /* Density */
  --density: 1;
  --s-1: calc(0.25rem * var(--density));
  --s-2: calc(0.5rem * var(--density));
  --s-3: calc(0.75rem * var(--density));
  --s-4: calc(1rem * var(--density));
  --s-5: calc(1.5rem * var(--density));
  --s-6: calc(2rem * var(--density));
  --s-7: calc(3rem * var(--density));
  --s-8: calc(4rem * var(--density));
  --s-9: calc(6rem * var(--density));

  /* Frame */
  --maxw: 1280px;
  --radius: 2px;
  --radius-lg: 4px;
}

[data-theme="dark"] {
  --bg: #0A1420;
  --bg-elev: #11202F;
  --bg-sunken: #061018;
  --fg: #ECE4D2;
  --fg-muted: #9AA4B0;
  --fg-subtle: #5A6470;
  --primary: var(--cream-200);
  --primary-fg: var(--navy-900);
  --accent: var(--gold-500);
  --accent-fg: var(--navy-900);
  --secondary: #1B8350;
  --rule: #1E2D3F;
  --rule-strong: #2C3D52;
}

[data-palette="forest"] {
  --primary: #084F29;
  --primary-fg: #F2EFE3;
  --accent: #DBA21B;
  --navy-900: #084F29;
  --navy-700: #0B6633;
}
[data-palette="forest"][data-theme="dark"] {
  --primary: #E8E2D1;
  --accent: #B89B4B;
}

[data-palette="azul"] {
  --primary: #0F2D52;
  --primary-fg: #F2EFE3;
  --accent: #C9A961;
  --navy-900: #0F2D52;
  --navy-700: #1B4480;
}

[data-palette="bordeaux"] {
  --primary: #4A1620;
  --primary-fg: #F4ECDF;
  --accent: #B8893D;
  --navy-900: #4A1620;
  --navy-700: #6E2530;
}

[data-typeset="serifPlex"] {
  --font-serif: "Source Serif 4", Georgia, serif;
  --font-sans: "IBM Plex Sans", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", monospace;
}
[data-typeset="newsreader"] {
  --font-serif: "Newsreader", Georgia, serif;
  --font-sans: "DM Sans", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", monospace;
}
[data-typeset="spectral"] {
  --font-serif: "Spectral", Georgia, serif;
  --font-sans: "Manrope", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", monospace;
}
[data-typeset="garamond"] {
  --font-serif: "EB Garamond", Georgia, serif;
  --font-sans: "IBM Plex Sans", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", monospace;
}

[data-density="compact"] { --density: 0.8; }
[data-density="comfy"]   { --density: 1; }
[data-density="airy"]    { --density: 1.25; }

/* ============================================================
   Base
   ============================================================ */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  font-size: var(--step-0);
  line-height: 1.55;
  color: var(--fg);
  background: var(--bg);
  font-feature-settings: "ss01", "cv11";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5 {
  font-family: var(--font-serif);
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.15;
  margin: 0;
  text-wrap: balance;
  color: var(--fg);
}

a { color: inherit; text-decoration: none; }
a.link {
  color: var(--primary);
  border-bottom: 1px solid var(--rule-strong);
  transition: border-color 0.15s;
}
a.link:hover { border-bottom-color: var(--accent); }

button { font: inherit; cursor: pointer; }

::selection { background: var(--accent); color: var(--accent-fg); }

/* ============================================================
   Layout primitives
   ============================================================ */
.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--s-5);
}

.rule {
  height: 1px;
  background: var(--rule);
  border: 0;
  margin: 0;
}
.rule-strong { background: var(--rule-strong); }

.eyebrow {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-muted);
}

.eyebrow-accent { color: var(--accent); }

.mono {
  font-family: var(--font-mono);
  font-feature-settings: "zero", "ss02";
}

.tabular { font-variant-numeric: tabular-nums; }

/* ============================================================
   Top nav
   ============================================================ */
.topbar {
  background: var(--primary);
  color: var(--primary-fg);
  font-family: var(--font-sans);
  font-size: 12px;
  border-bottom: 1px solid color-mix(in srgb, var(--primary) 70%, black);
}
.topbar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 32px;
  letter-spacing: 0.04em;
  white-space: nowrap;
}
.topbar a { color: inherit; opacity: 0.7; transition: opacity 0.15s; white-space: nowrap; }
.topbar a:hover { opacity: 1; }
.topbar-links { display: flex; gap: var(--s-5); align-items: center; white-space: nowrap; }

.nav {
  background: var(--bg-elev);
  border-bottom: 1px solid var(--rule);
  position: sticky;
  top: 0;
  z-index: 50;
}
.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 76px;
  gap: var(--s-6);
}
.brand {
  display: flex;
  align-items: center;
  gap: var(--s-3);
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 20px;
  letter-spacing: -0.005em;
  color: var(--fg);
}
.brand-mark-img {
  display: block;
  height: 44px;
  width: auto;
}
.brand-img {
  display: block;
  height: 64px;
  width: auto;
}
.brand-large .brand-img { height: 120px; }
.nav-inner { height: 76px; }
@media (max-width: 720px) {
  .brand-mark-img { height: 36px; }
  .brand-img { height: 48px; }
}
.brand-mark {
  width: 38px;
  height: 38px;
  background: var(--primary);
  color: var(--primary-fg);
  display: grid;
  place-items: center;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 17px;
  letter-spacing: 0.02em;
  position: relative;
}
.brand-mark::after {
  content: '';
  position: absolute;
  inset: auto 0 4px 0;
  height: 2px;
  background: var(--accent);
  width: 60%;
  margin: 0 auto;
}
.brand-name { display: flex; flex-direction: column; line-height: 1.05; white-space: nowrap; gap: 2px; }
.brand-name strong {
  font-weight: 500;
  font-family: var(--font-serif);
  font-size: 19px;
  letter-spacing: -0.005em;
}
.brand-name > span {
  font-family: var(--font-sans);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin-top: 4px;
}

.nav-links {
  display: flex;
  gap: var(--s-6);
  align-items: center;
  font-family: var(--font-sans);
  font-size: 14px;
  white-space: nowrap;
}
.nav-links a {
  color: var(--fg);
  padding: 6px 0;
  position: relative;
  transition: color 0.15s;
  white-space: nowrap;
}
.nav-links a:hover { color: var(--primary); }
.nav-links a.active::after {
  content: '';
  position: absolute;
  inset: auto 0 -26px 0;
  height: 2px;
  background: var(--accent);
}

.nav-cta {
  display: flex;
  gap: var(--s-3);
  align-items: center;
  white-space: nowrap;
}
.nav-cta .btn { white-space: nowrap; }

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.01em;
  padding: 10px 20px;
  background: var(--primary);
  color: var(--primary-fg);
  border: 1px solid var(--primary);
  border-radius: var(--radius);
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  transition: all 0.15s;
  cursor: pointer;
  text-decoration: none;
}
.btn:hover { background: color-mix(in srgb, var(--primary) 88%, black); }
.btn-ghost {
  background: transparent;
  color: var(--fg);
  border-color: var(--rule-strong);
}
.btn-ghost:hover { background: var(--bg-sunken); }
.btn-accent {
  background: var(--accent);
  color: var(--accent-fg);
  border-color: var(--accent);
}
.btn-accent:hover { background: color-mix(in srgb, var(--accent) 85%, black); }
.btn-text {
  background: transparent;
  color: var(--primary);
  border: none;
  padding: 6px 0;
  text-decoration: underline;
  text-decoration-color: var(--rule-strong);
  text-underline-offset: 4px;
}
.btn-sm { padding: 6px 12px; font-size: 12px; }
.btn-lg { padding: 14px 28px; font-size: 15px; }
.btn[disabled] { opacity: 0.45; cursor: not-allowed; }

.icon-arrow::after {
  content: '→';
  font-family: var(--font-serif);
  display: inline-block;
  margin-left: 4px;
  transition: transform 0.2s;
}
.btn:hover .icon-arrow::after,
a:hover .icon-arrow::after { transform: translateX(3px); }

/* ============================================================
   Hero
   ============================================================ */
.hero {
  border-bottom: 1px solid var(--rule);
  padding: var(--s-9) 0 var(--s-9);
  background: var(--bg);
  position: relative;
}
.hero-grid {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: var(--s-8);
  align-items: end;
}
.hero h1 {
  font-size: clamp(2.4rem, 5vw, 4.25rem);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.05;
}
.hero h1 em {
  font-style: italic;
  color: var(--primary);
  font-weight: 500;
}
.hero-lede {
  font-size: var(--step-2);
  color: var(--fg-muted);
  max-width: 36ch;
  line-height: 1.5;
  margin-top: var(--s-4);
}
.hero-meta {
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
  padding-left: var(--s-5);
  border-left: 1px solid var(--rule-strong);
}
.hero-meta dt {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-muted);
}
.hero-meta dd {
  font-family: var(--font-serif);
  font-size: var(--step-1);
  margin: 0;
  color: var(--fg);
}
.hero-actions {
  display: flex;
  gap: var(--s-3);
  margin-top: var(--s-6);
}

/* ============================================================
   Section primitives
   ============================================================ */
.section {
  padding: var(--s-9) 0;
  border-bottom: 1px solid var(--rule);
}
.section-tight { padding: var(--s-7) 0; }
.section-sunken { background: var(--bg-sunken); }
.section-dark {
  background: var(--primary);
  color: var(--primary-fg);
}
.section-dark h1, .section-dark h2, .section-dark h3 { color: var(--primary-fg); }
.section-dark .eyebrow { color: var(--accent); }

.section-head {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: var(--s-6);
  margin-bottom: var(--s-7);
}
.section-head h2 {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 400;
  letter-spacing: -0.015em;
}
.section-head .eyebrow { margin-bottom: var(--s-3); }
.section-head-actions { display: flex; gap: var(--s-4); align-items: center; }

/* ============================================================
   Cards
   ============================================================ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-5);
}
.card-grid-2 { grid-template-columns: repeat(2, 1fr); }
.card-grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--bg-elev);
  border: 1px solid var(--rule);
  padding: var(--s-5);
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
  transition: border-color 0.2s, transform 0.2s;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
}
.card:hover { border-color: var(--rule-strong); }
.card-tag {
  font-family: var(--font-sans);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
}
.card h3 {
  font-size: var(--step-2);
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: -0.005em;
}
.card-desc {
  color: var(--fg-muted);
  font-size: var(--step-0);
  flex-grow: 1;
}
.card-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-subtle);
  display: flex;
  gap: var(--s-3);
  border-top: 1px solid var(--rule);
  padding-top: var(--s-3);
  margin-top: var(--s-3);
}
.card-meta span::before { content: '·'; margin-right: var(--s-3); color: var(--fg-subtle); }
.card-meta span:first-child::before { content: none; margin: 0; }

/* Card style variants */
[data-cardstyle="bordered"] .card {
  background: var(--bg-elev);
  border: 1px solid var(--rule);
}
[data-cardstyle="bordered"] .card:hover {
  border-color: var(--primary);
}
[data-cardstyle="paper"] .card {
  background: var(--bg-elev);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
}
[data-cardstyle="paper"] .card:hover {
  border-left-color: var(--primary);
}
[data-cardstyle="minimal"] .card {
  background: transparent;
  border: none;
  border-top: 1px solid var(--rule-strong);
  padding: var(--s-4) 0;
}
[data-cardstyle="minimal"] .card-meta { border-top: none; padding-top: 0; }

/* Hero layout variants */
[data-herolayout="centered"] .hero-grid {
  grid-template-columns: 1fr;
  justify-items: center;
  text-align: center;
}
[data-herolayout="centered"] .hero-lede { margin-left: auto; margin-right: auto; max-width: 56ch; }
[data-herolayout="centered"] .hero-meta {
  border-left: none;
  border-top: 1px solid var(--rule-strong);
  padding-left: 0;
  padding-top: var(--s-5);
  margin-top: var(--s-6);
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--s-6);
}
[data-herolayout="centered"] .hero-actions { justify-content: center; }

[data-herolayout="split"] .hero-grid {
  grid-template-columns: 1fr 1fr;
}

/* ============================================================
   Editorial article
   ============================================================ */
.article-body {
  font-family: var(--font-serif);
  font-size: 19px;
  line-height: 1.65;
  color: var(--fg);
  max-width: 65ch;
}
.article-body p { margin: 0 0 1.1em; }
.article-body h2 {
  font-size: 1.625rem;
  margin: 2em 0 0.5em;
  font-weight: 500;
}
.article-body h3 {
  font-size: 1.25rem;
  margin: 1.5em 0 0.4em;
  font-weight: 500;
}
.article-body blockquote {
  margin: 1.5em 0;
  padding-left: var(--s-5);
  border-left: 2px solid var(--accent);
  font-style: italic;
  color: var(--fg-muted);
}
.article-body code, .article-body .formula {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--bg-sunken);
  padding: 1px 6px;
  border: 1px solid var(--rule);
}
.article-body .formula-block {
  display: block;
  padding: var(--s-4) var(--s-5);
  background: var(--bg-sunken);
  border-left: 3px solid var(--primary);
  margin: 1.5em 0;
  text-align: center;
  font-size: 1.05em;
}

.article-aside {
  font-family: var(--font-sans);
  font-size: var(--step--1);
}

/* ============================================================
   Forms
   ============================================================ */
.form-field { display: flex; flex-direction: column; gap: var(--s-2); margin-bottom: var(--s-5); }
.form-field label {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-muted);
}
.form-input, .form-select {
  font: inherit;
  font-family: var(--font-sans);
  font-size: var(--step-0);
  padding: 12px 14px;
  background: var(--bg-elev);
  border: 1px solid var(--rule-strong);
  color: var(--fg);
  border-radius: var(--radius);
  width: 100%;
  transition: border-color 0.15s, background 0.15s;
}
.form-input:focus, .form-select:focus {
  outline: none;
  border-color: var(--primary);
  background: var(--bg-elev);
}
.form-input.error { border-color: var(--danger); }
.form-error {
  color: var(--danger);
  font-size: 12px;
  font-family: var(--font-sans);
  margin-top: 4px;
}
.form-hint {
  color: var(--fg-muted);
  font-size: 12px;
  font-family: var(--font-sans);
  margin-top: 2px;
}
.form-check {
  display: flex;
  align-items: flex-start;
  gap: var(--s-3);
  font-size: var(--step-0);
  color: var(--fg);
  margin-bottom: var(--s-4);
  cursor: pointer;
}
.form-check input { margin-top: 4px; accent-color: var(--primary); }

/* ============================================================
   Auth scenes
   ============================================================ */
.auth-stage {
  min-height: calc(100vh - 72px - 32px);
  display: grid;
  grid-template-columns: 1fr 1fr;
}
.auth-aside {
  background: var(--primary);
  color: var(--primary-fg);
  padding: var(--s-8) var(--s-7);
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.auth-aside h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 2.6vw, 2.5rem);
  font-weight: 400;
  letter-spacing: -0.015em;
  max-width: 22ch;
  color: var(--primary-fg);
}
.auth-aside-quote {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: var(--step-1);
  opacity: 0.85;
  max-width: 38ch;
  line-height: 1.5;
}
.auth-aside-foot {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  opacity: 0.6;
  text-transform: uppercase;
}
.auth-form-wrap {
  padding: var(--s-8) var(--s-7);
  display: flex;
  flex-direction: column;
  justify-content: center;
  max-width: 540px;
  width: 100%;
  margin: 0 auto;
}
.auth-form-wrap h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 2.4vw, 2.25rem);
  font-weight: 400;
  margin-bottom: var(--s-2);
}
.auth-sub {
  color: var(--fg-muted);
  margin-bottom: var(--s-6);
  font-size: var(--step-1);
}

@media (max-width: 880px) {
  .auth-stage { grid-template-columns: 1fr; }
  .auth-aside { display: none; }
}

/* ============================================================
   Tools / Calculators
   ============================================================ */
.tool-stage {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 0;
  min-height: calc(100vh - 72px - 32px);
}
.tool-controls {
  background: var(--bg-elev);
  border-right: 1px solid var(--rule);
  padding: var(--s-6) var(--s-5);
  overflow-y: auto;
}
.tool-controls h2 {
  font-size: var(--step-2);
  font-weight: 500;
  margin-bottom: var(--s-2);
}
.tool-controls .eyebrow { margin-bottom: var(--s-2); }
.tool-output {
  padding: var(--s-6) var(--s-6);
  background: var(--bg);
}

.kv-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--s-2) var(--s-4);
  margin: var(--s-5) 0;
}
.kv-grid > div {
  border-top: 1px solid var(--rule);
  padding: var(--s-3) 0;
}
.kv-label {
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-muted);
  font-family: var(--font-sans);
  margin-bottom: 4px;
}
.kv-value {
  font-family: var(--font-mono);
  font-size: var(--step-2);
  font-weight: 500;
  color: var(--fg);
}
.kv-value.pos { color: var(--success); }
.kv-value.neg { color: var(--danger); }

.greeks {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  margin-top: var(--s-5);
}
.greeks > div {
  background: var(--bg-elev);
  padding: var(--s-4);
  text-align: center;
}
.greek-name {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 18px;
  color: var(--fg-muted);
}
.greek-value {
  font-family: var(--font-mono);
  font-size: var(--step-2);
  font-weight: 500;
  margin-top: var(--s-2);
}

/* ============================================================
   Tables
   ============================================================ */
.table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-sans);
  font-size: var(--step-0);
}
.table th, .table td {
  text-align: left;
  padding: var(--s-3) var(--s-4);
  border-bottom: 1px solid var(--rule);
}
.table th {
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-muted);
  font-weight: 600;
  border-bottom: 1px solid var(--rule-strong);
}
.table td.num { font-family: var(--font-mono); text-align: right; font-variant-numeric: tabular-nums; }
.table th.num { text-align: right; }
.table tr:hover td { background: var(--bg-sunken); }

/* ============================================================
   Footer
   ============================================================ */
.footer {
  background: var(--primary);
  color: var(--primary-fg);
  padding: var(--s-8) 0 var(--s-5);
  margin-top: var(--s-8);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--s-7);
  padding-bottom: var(--s-7);
  border-bottom: 1px solid color-mix(in srgb, var(--primary-fg) 20%, transparent);
}
.footer h4 {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--s-4);
}
.footer ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: var(--s-2); }
.footer ul a { font-size: 13px; opacity: 0.8; }
.footer ul a:hover { opacity: 1; }
.footer-logo {
  display: block;
  height: 96px;
  width: auto;
  margin-bottom: var(--s-4);
}
.footer-brand-line {
  font-family: var(--font-serif);
  font-size: var(--step-2);
  font-weight: 500;
  margin-bottom: var(--s-3);
}
.footer-mission {
  font-size: 13px;
  opacity: 0.75;
  max-width: 36ch;
  line-height: 1.6;
}
.footer-bottom {
  display: flex;
  justify-content: space-between;
  padding-top: var(--s-4);
  font-family: var(--font-mono);
  font-size: 11px;
  opacity: 0.55;
  letter-spacing: 0.04em;
}

/* ============================================================
   Tag / Pill / Badge
   ============================================================ */
.pill {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border: 1px solid var(--rule-strong);
  font-family: var(--font-sans);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg);
  border-radius: 999px;
  background: var(--bg-elev);
}
.pill.active {
  background: var(--primary);
  color: var(--primary-fg);
  border-color: var(--primary);
}
.pill-row { display: flex; flex-wrap: wrap; gap: var(--s-2); }

.tag {
  display: inline-block;
  padding: 2px 8px;
  font-family: var(--font-sans);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: var(--bg-sunken);
  border: 1px solid var(--rule);
  color: var(--fg-muted);
}

/* ============================================================
   Tabs
   ============================================================ */
.tabs {
  display: flex;
  border-bottom: 1px solid var(--rule-strong);
  margin-bottom: var(--s-5);
  gap: var(--s-5);
}
.tab {
  padding: var(--s-3) 0;
  font-family: var(--font-sans);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--fg-muted);
  cursor: pointer;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
}
.tab.active {
  color: var(--fg);
  border-bottom-color: var(--accent);
}

/* ============================================================
   Stats / Metrics
   ============================================================ */
.metric {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: var(--s-5) 0;
  border-top: 1px solid var(--rule-strong);
}
.metric-label {
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-muted);
}
.metric-value {
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 400;
  letter-spacing: -0.015em;
}
.metric-sub { font-size: 12px; color: var(--fg-muted); }

/* ============================================================
   Misc
   ============================================================ */
.placeholder-image {
  background: repeating-linear-gradient(135deg, var(--bg-sunken) 0 10px, var(--bg-elev) 10px 20px);
  border: 1px solid var(--rule);
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  aspect-ratio: 16 / 10;
}

.crumb {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-muted);
  letter-spacing: 0.04em;
  display: flex;
  gap: var(--s-2);
  align-items: center;
}
.crumb a { color: inherit; }
.crumb a:hover { color: var(--fg); }
.crumb-sep::before { content: '/'; margin: 0 var(--s-2); color: var(--fg-subtle); }

.notice {
  border: 1px solid var(--rule-strong);
  background: var(--bg-elev);
  padding: var(--s-4) var(--s-5);
  font-family: var(--font-sans);
  font-size: 13px;
  display: flex;
  gap: var(--s-4);
  align-items: flex-start;
  margin: var(--s-4) 0;
}
.notice strong { font-weight: 600; color: var(--fg); }
.notice-success { border-left: 3px solid var(--success); }
.notice-warn { border-left: 3px solid var(--accent); }
.notice-error { border-left: 3px solid var(--danger); }

/* video */
.video-stage {
  background: var(--ink-900);
  aspect-ratio: 16 / 9;
  position: relative;
  display: grid;
  place-items: center;
  color: rgba(255,255,255,0.65);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  overflow: hidden;
}
.video-stage::before {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(135deg, rgba(255,255,255,0.02) 0 10px, transparent 10px 20px);
}
.video-play {
  width: 72px;
  height: 72px;
  border: 1px solid rgba(255,255,255,0.4);
  border-radius: 999px;
  display: grid;
  place-items: center;
  background: rgba(255,255,255,0.05);
  cursor: pointer;
  position: relative;
  z-index: 1;
}
.video-play::after {
  content: '';
  width: 0; height: 0;
  border-left: 16px solid rgba(255,255,255,0.9);
  border-top: 10px solid transparent;
  border-bottom: 10px solid transparent;
  margin-left: 4px;
}

.scrubber {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 4px;
  background: rgba(255,255,255,0.1);
  z-index: 2;
}
.scrubber-fill { height: 100%; background: var(--accent); width: 28%; }

/* lesson sidebar */
.lesson-stage {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 0;
  min-height: calc(100vh - 72px - 32px);
}
.lesson-main { padding: var(--s-6) var(--s-6); }
.lesson-side {
  border-left: 1px solid var(--rule);
  background: var(--bg-elev);
  padding: var(--s-6) var(--s-5);
}

.module-list { list-style: none; padding: 0; margin: 0; }
.module-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--s-3);
  padding: var(--s-3) 0;
  border-bottom: 1px solid var(--rule);
  font-size: 13px;
  cursor: pointer;
}
.module-item:hover { background: var(--bg-sunken); margin: 0 calc(var(--s-5) * -1); padding-left: var(--s-5); padding-right: var(--s-5); }
.module-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-subtle);
  width: 32px;
}
.module-item.active .module-num { color: var(--accent); }
.module-item.active { color: var(--primary); }
.module-time { font-family: var(--font-mono); font-size: 11px; color: var(--fg-subtle); }

/* dashboard */
.dash-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--s-5);
}

.panel {
  background: var(--bg-elev);
  border: 1px solid var(--rule);
  padding: var(--s-5);
}
.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--s-4);
  padding-bottom: var(--s-3);
  border-bottom: 1px solid var(--rule);
}
.panel-head h3 {
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-muted);
}

/* progress bar */
.bar {
  height: 4px;
  background: var(--bg-sunken);
  position: relative;
}
.bar-fill {
  height: 100%;
  background: var(--accent);
}

/* legend swatch */
.swatch {
  display: inline-block;
  width: 10px;
  height: 10px;
  vertical-align: middle;
  margin-right: 6px;
}

/* page wrapper */
.page-body { min-height: calc(100vh - 240px); }

@media (max-width: 980px) {
  .tool-stage { grid-template-columns: 1fr; }
  .tool-controls { border-right: none; border-bottom: 1px solid var(--rule); }
  .lesson-stage { grid-template-columns: 1fr; }
  .hero-grid { grid-template-columns: 1fr; }
  .section-head { grid-template-columns: 1fr; }
  .card-grid, .card-grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .nav-links { display: none; }
  .brand-name > span { display: none; }
  .topbar-links { display: none; }
}
@media (max-width: 600px) {
  .card-grid, .card-grid-2, .card-grid-4 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .greeks { grid-template-columns: repeat(2, 1fr); }
  .kv-grid { grid-template-columns: 1fr; }
}

/* ============================================================
   Nav dropdown — submenus exibidos no hover
   ============================================================ */
.nav-menu-item {
  position: relative;
  display: flex;
  align-items: center;
}
.nav-menu-item > a {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}
.nav-caret {
  font-size: 9px;
  color: var(--fg-subtle);
  transition: transform 0.15s, color 0.15s;
  line-height: 1;
  position: relative;
  top: 1px;
}
.nav-menu-item:hover .nav-caret {
  transform: rotate(180deg);
  color: var(--primary);
}

.nav-dropdown {
  position: absolute;
  top: 100%;
  left: -16px;
  min-width: 280px;
  margin-top: 14px;
  background: var(--bg-elev);
  border: 1px solid var(--rule);
  box-shadow: 0 10px 32px rgba(17, 33, 61, 0.10);
  padding: var(--s-3) 0;
  z-index: 60;
  animation: nav-dropdown-in 0.14s ease-out;
}
@keyframes nav-dropdown-in {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.nav-dropdown-link {
  display: flex !important;
  flex-direction: column;
  gap: 3px;
  padding: var(--s-3) var(--s-5) !important;
  color: var(--fg) !important;
  text-decoration: none;
  position: relative;
}
.nav-dropdown-link:hover {
  background: var(--bg-sunken);
  color: var(--primary) !important;
}
.nav-dropdown-link::after { display: none !important; }
.nav-dropdown-label {
  display: flex;
  align-items: center;
  gap: var(--s-3);
  font-weight: 500;
  font-size: 14px;
}
.nav-dropdown-desc {
  font-size: 11.5px;
  color: var(--fg-muted);
  line-height: 1.45;
  font-weight: 400;
}
.nav-dropdown-sep {
  border: none;
  border-top: 1px solid var(--rule);
  margin: var(--s-2) var(--s-5);
}

.premium-badge {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--accent-fg);
  background: var(--accent);
  padding: 2px 6px;
  white-space: nowrap;
  vertical-align: middle;
  line-height: 1.2;
}

/* ============================================================
   "Em desenvolvimento" — página placeholder reutilizável
   ============================================================ */
.coming-soon-stage {
  padding: var(--s-9) 0;
  background: var(--bg);
}
.coming-soon-card {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
  padding: var(--s-7) var(--s-6);
  background: var(--bg-elev);
  border: 1px solid var(--rule);
  border-top: 3px solid var(--accent);
}
.coming-soon-card h1 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 400;
  letter-spacing: -0.02em;
  margin: var(--s-3) 0 var(--s-4);
}
.coming-soon-meta {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--s-4);
  margin-top: var(--s-5);
  padding-top: var(--s-5);
  border-top: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-muted);
  letter-spacing: 0.04em;
}
.coming-soon-meta span::before { content: '·'; margin-right: var(--s-4); color: var(--fg-subtle); }
.coming-soon-meta span:first-child::before { content: none; margin: 0; }

/* ============================================================
   Dashboard — bloco de acesso exclusivo (membros)
   ============================================================ */
.dash-exclusive {
  background: linear-gradient(180deg, var(--bg-sunken) 0%, var(--bg) 100%);
  padding: var(--s-6) 0 var(--s-7);
  border-bottom: 1px solid var(--rule);
}
.dash-exclusive-head {
  margin-bottom: var(--s-5);
}
.dash-exclusive-head h2 {
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  font-weight: 400;
  letter-spacing: -0.015em;
  margin-top: var(--s-2);
}
.exclusive-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--accent);
}
.exclusive-chip::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
}

.dash-exclusive-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-5);
}
.dash-exclusive-card {
  background: var(--bg-elev);
  border: 1px solid var(--border-strong);
  border-top: 3px solid var(--accent);
  padding: var(--s-5);
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
  color: var(--fg);
  text-decoration: none;
  transition: transform 0.18s, border-color 0.18s;
}
.dash-exclusive-card:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
  border-top-color: var(--accent);
}
.dash-exclusive-card h3 {
  font-family: var(--font-serif);
  font-size: var(--step-2);
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.25;
}
.dash-exclusive-card-desc {
  font-size: 13px;
  color: var(--fg-muted);
  line-height: 1.55;
}
.dash-exclusive-card-meta {
  margin-top: auto;
  padding-top: var(--s-3);
  border-top: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-muted);
  letter-spacing: 0.04em;
}

/* Notice "área restrita" no topo das páginas de auth */
.auth-gate-notice {
  background: var(--bg-sunken);
  border-left: 3px solid var(--accent);
  padding: var(--s-3) var(--s-4);
  margin-bottom: var(--s-5);
  font-size: 13px;
  color: var(--fg);
  line-height: 1.5;
}

@media (max-width: 900px) {
  .dash-exclusive-grid { grid-template-columns: 1fr; }
  .nav-dropdown {
    position: static;
    box-shadow: none;
    border: none;
    border-top: 1px solid var(--rule);
    min-width: 0;
    padding-left: var(--s-4);
    margin-top: 0;
  }
}