/* ============================================
   GOLDSTAY FOUNDATION — Design System & Styles
   All 16.5 improvements applied
   ============================================ */

/* ---- Google Fonts ---- */
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,500;0,600;0,700;1,400&family=Inter:wght@300;400;500;600&display=swap');

/* ---- CSS Custom Properties ---- */
:root {
  --color-black-deep: #0D0D0D;
  --color-black-bg: #1F1F1F;
  --color-white: #FFFFFF;
  --color-gray-light-bg: #F5F5F5;
  --color-gray-body: #4A4A4A;
  --color-gray-muted: #6B6B6B;
  --color-gray-border: #CCCCCC;
  --color-gray-silver: #C0C0C0;
  --color-gold-champagne: #C9A961;
  --color-gold-classic: #D4AF37;

  --bg-primary: var(--color-white);
  --bg-secondary: var(--color-gray-light-bg);
  --bg-footer: var(--color-black-deep);
  --text-primary: var(--color-black-deep);
  --text-body: var(--color-gray-body);
  --text-muted: var(--color-gray-muted);
  --text-inverse: var(--color-white);
  --border-color: var(--color-gray-border);
  --gold: var(--color-gold-champagne);
  --gold-accent: var(--color-gold-classic);
  --gold-subtle: rgba(201,169,97,0.4);
  --text-secondary: var(--color-gray-body);

  --font-serif: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', sans-serif;

  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 32px;
  --space-xl: 48px;
  --space-2xl: 64px;
  --space-3xl: 80px;
  --space-4xl: 96px;
  --space-5xl: 100px;

  --max-width: 1280px;
  --navbar-height: 64px;
  --transition-fast: 200ms ease;
  --transition-normal: 300ms ease;
}

/* ---- Dark Mode ---- */
[data-theme="dark"] {
  --bg-primary: #0F0F0F;
  --bg-secondary: #1A1A1A;
  --bg-footer: #080808;
  --text-primary: var(--color-white);
  --text-body: var(--color-gray-silver);
  --text-muted: #999999;
  --text-inverse: var(--color-black-deep);
  --border-color: #2A2A2A;
  --gold: var(--color-gold-classic);
  --gold-accent: #E0C050;
  --gold-subtle: rgba(212,175,55,0.35);
  --text-secondary: var(--color-gray-silver);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-body);
  background-color: var(--bg-primary);
  transition: background-color var(--transition-fast), color var(--transition-fast);
  overflow-x: hidden;
}

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

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition-fast);
}

ul, ol { list-style: none; }

button, input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  border: none;
  outline: none;
  background: none;
}

::selection {
  background-color: var(--gold);
  color: var(--color-black-deep);
}

/* ---- Typography ---- */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  color: var(--text-primary);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.2;
}
h1 { font-size: 56px; }
h2 { font-size: 40px; }
h3 { font-size: 28px; }
h4 { font-size: 20px; }
p { margin-bottom: 0; color: var(--text-body); }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-3xl);
}

/* ============================================
   NAVBAR
   ============================================ */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--navbar-height);
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.navbar-brand {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
}

.navbar-brand .brand-g {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  border: 2px solid var(--gold);
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: 0;
}

.navbar-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.navbar-links a {
  font-size: 14px;
  font-weight: 400;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  position: relative;
  padding: 4px 0;
}

.navbar-links a::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 0; height: 1px;
  background-color: var(--gold);
  transition: width var(--transition-normal);
}

.navbar-links a:hover { color: var(--text-primary); }
.navbar-links a:hover::after { width: 100%; }
.navbar-links a.active { color: var(--text-primary); }

.navbar-right {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.theme-toggle {
  cursor: pointer;
  width: 36px; height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background-color var(--transition-fast);
  color: var(--text-muted);
}

.theme-toggle:hover {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
}

.theme-toggle svg {
  width: 18px; height: 18px;
  fill: currentColor;
  transition: fill var(--transition-fast);
}

.contact-link {
  font-size: 14px;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}
.contact-link:hover { color: var(--gold); }

.mobile-nav-toggle {
  display: none;
  cursor: pointer;
  width: 36px; height: 36px;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
}
.mobile-nav-toggle svg { width: 24px; height: 24px; fill: currentColor; }

main { padding-top: var(--navbar-height); }

/* ============================================
   HERO
   ============================================ */
.hero {
  background-color: var(--bg-primary);
  padding: var(--space-5xl) 0;
  transition: background-color var(--transition-fast);
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: center;
}

.hero-text { max-width: 560px; }

.hero-text h1 {
  font-size: 52px;
  line-height: 1.15;
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

.hero-tagline {
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-body);
  margin-bottom: var(--space-xl);
  max-width: 480px;
}

.hero-buttons {
  display: flex;
  gap: var(--space-sm);
  align-items: center;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
}

.btn-primary {
  background-color: var(--gold);
  color: var(--color-black-deep);
  border-color: var(--gold);
}
.btn-primary:hover {
  background-color: var(--gold-accent);
  border-color: var(--gold-accent);
}

.btn-outline {
  background-color: transparent;
  color: var(--text-primary);
  border-color: var(--text-primary);
}
.btn-outline:hover {
  background-color: var(--text-primary);
  color: var(--bg-primary);
}

/* #12 Hero image hover zoom */
.hero-image {
  position: relative;
  overflow: hidden;
}

.hero-image img {
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 11;
  filter: grayscale(10%) contrast(1.05);
  transition: transform 600ms ease, filter 600ms ease;
}

.hero-image:hover img {
  transform: scale(1.02);
  filter: grayscale(5%) contrast(1.08) brightness(1.03);
}

[data-theme="dark"] .hero-image img {
  filter: grayscale(10%) contrast(1.05) brightness(0.85);
}

[data-theme="dark"] .hero-image:hover img {
  filter: grayscale(5%) contrast(1.08) brightness(0.9);
}

/* ============================================
   #6 COUNTERS SECTION
   ============================================ */
.counters-section {
  background-color: var(--bg-primary);
  padding: var(--space-xl) 0;
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.counters-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  text-align: center;
}

.counter-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.counter-number {
  font-family: var(--font-serif);
  font-size: 48px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
  letter-spacing: -0.02em;
}

.counter-label {
  font-size: 13px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 500;
}

/* ============================================
   FEATURED BOOKS
   ============================================ */
.featured-books {
  background-color: var(--bg-secondary);
  padding: var(--space-3xl) 0;
  transition: background-color var(--transition-fast);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-xl);
}
.section-header h2 { font-size: 36px; margin-bottom: var(--space-xs); }
.section-header p { font-size: 16px; color: var(--text-muted); }

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

.book-card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
  cursor: pointer;
  overflow: hidden;
  position: relative;
}
.book-card:hover { border-color: var(--gold); }

/* #7 Badge "NOVO" */
.book-badge {
  position: absolute;
  top: 12px;
  right: 12px;
  background-color: var(--gold);
  color: var(--color-black-deep);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 3px 8px;
  z-index: 2;
}

.book-card-image {
  width: 100%;
  height: 320px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-secondary);
  padding: var(--space-md);
}

.book-card-image img {
  width: 200px;
  height: 280px;
  object-fit: cover;
}

.book-card-info { padding: var(--space-md); }

.book-card-info h4 {
  font-family: var(--font-serif);
  font-size: 18px;
  color: var(--text-primary);
  margin-bottom: 4px;
  line-height: 1.3;
}

.book-card-info .book-author {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 4px;
}

/* #14 Category tag on cards */
.book-card-tag {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: var(--space-sm);
  display: block;
}

.book-card-info .book-link {
  font-size: 14px;
  color: var(--gold);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap var(--transition-fast);
}
.book-card-info .book-link:hover { gap: 10px; }

.book-card-info .book-link .arrow {
  transition: transform var(--transition-fast);
}
.book-card:hover .book-link .arrow {
  transform: translateX(3px);
}

/* ============================================
   #1 QUOTE SECTION
   ============================================ */
.quote-section {
  background-color: var(--bg-primary);
  padding: var(--space-3xl) 0;
  transition: background-color var(--transition-fast);
}

.daily-quote {
  max-width: 780px;
  margin: 0 auto;
  text-align: center;
}

.daily-quote p {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 24px;
  line-height: 1.6;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.daily-quote p::before { content: '\201C'; }
.daily-quote p::after { content: '\201D'; }

.daily-quote cite {
  font-family: var(--font-sans);
  font-size: 14px;
  font-style: normal;
  color: var(--gold);
  letter-spacing: 0.04em;
  display: block;
}

/* ============================================
   MISSION
   ============================================ */
.mission {
  background-color: var(--bg-secondary);
  padding: var(--space-4xl) 0;
  transition: background-color var(--transition-fast);
}

.mission .container {
  max-width: 1180px;
  text-align: left;
}

.mission-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(300px, 420px);
  gap: var(--space-3xl);
  align-items: center;
}

.mission-copy {
  max-width: 740px;
}

.mission-copy .gold-line {
  margin-left: 0;
  margin-right: 0;
}

.mission-visual {
  margin: 0;
  height: clamp(520px, 52vw, 760px);
  border-radius: 8px;
  overflow: hidden;
  background-color: var(--bg-primary);
  box-shadow: var(--shadow-lg);
}

.mission-visual img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* #11 Gold decorative line */
.gold-line {
  width: 60px;
  height: 2px;
  background-color: var(--gold);
  margin: 0 auto var(--space-md);
}

.mission h2 {
  font-size: 36px;
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

.mission p {
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-body);
  margin-bottom: var(--space-md);
}
.mission p:last-child { margin-bottom: 0; }

/* ============================================
   BIBLIOTECA
   ============================================ */
.page-biblioteca { display: none; }

.library-header {
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  padding: var(--space-md) 0;
  position: sticky;
  top: var(--navbar-height);
  z-index: 100;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.library-header .container {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.library-controls {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.search-input {
  width: 400px;
  max-width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  font-size: 14px;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: border-color var(--transition-fast), background-color var(--transition-fast), color var(--transition-fast);
}
.search-input::placeholder { color: var(--text-muted); }
.search-input:focus { border-color: var(--gold); }

.library-filters {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.filter-checkbox {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: var(--text-body);
  cursor: pointer;
}

.filter-checkbox input[type="checkbox"] {
  width: 16px; height: 16px;
  accent-color: var(--gold);
  cursor: pointer;
}

.sort-select {
  padding: 10px 14px;
  border: 1px solid var(--border-color);
  font-size: 14px;
  color: var(--text-body);
  background-color: var(--bg-primary);
  cursor: pointer;
  margin-left: auto;
  transition: border-color var(--transition-fast), background-color var(--transition-fast), color var(--transition-fast);
}
.sort-select:focus { border-color: var(--gold); }

.book-list { padding: var(--space-xl) 0; }

.book-list-item {
  display: grid;
  grid-template-columns: 100px 1fr auto;
  gap: var(--space-md);
  align-items: center;
  padding: var(--space-sm);
  border-left: 3px solid transparent;
  border-bottom: 1px solid var(--border-color);
  transition: border-color var(--transition-fast);
  cursor: pointer;
  position: relative;
}
.book-list-item:hover { border-left-color: var(--gold); }
.book-list-item:last-child { border-bottom: none; }

.book-list-cover { width: 100px; height: 150px; overflow: hidden; }
.book-list-cover img { width: 100%; height: 100%; object-fit: cover; }

.book-list-info h4 {
  font-family: var(--font-serif);
  font-size: 20px;
  color: var(--text-primary);
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 10px;
}

/* #7 Badge in list view */
.list-badge {
  background-color: var(--gold);
  color: var(--color-black-deep);
  font-family: var(--font-sans);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 2px 6px;
  flex-shrink: 0;
}

.book-list-info .book-meta {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 8px;
}
.book-list-info .book-meta span { margin-right: 16px; }

.book-list-info .book-summary {
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.5;
  max-width: 600px;
}

.book-list-action { display: flex; align-items: center; }

.book-list-action a {
  font-size: 14px;
  color: var(--gold);
  font-weight: 500;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 6px;
}
.book-list-action a:hover { color: var(--gold-accent); }

/* ============================================
   BOOK DETAIL
   ============================================ */
.page-book-detail { display: none; }

.book-detail {
  padding: var(--space-2xl) 0 var(--space-4xl);
}

.book-detail .container { max-width: var(--max-width); }

/* #4 Breadcrumbs */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  margin-bottom: var(--space-lg);
  color: var(--text-muted);
}

.breadcrumbs a {
  color: var(--text-muted);
  transition: color var(--transition-fast);
}
.breadcrumbs a:hover { color: var(--gold); }

.breadcrumb-sep { color: var(--border-color); }

.breadcrumb-current {
  color: var(--text-primary);
  font-weight: 500;
}

.book-detail-grid {
  display: grid;
  grid-template-columns: 350px 1fr;
  gap: var(--space-2xl);
  align-items: start;
}

.book-detail-left {
  position: sticky;
  top: calc(var(--navbar-height) + var(--space-lg));
}

.book-detail-cover {
  width: 100%;
  max-width: 350px;
  height: auto;
  border: 1px solid var(--border-color);
  margin-bottom: var(--space-md);
}
.book-detail-cover img { width: 100%; height: auto; object-fit: cover; }

.book-detail-meta { font-size: 14px; color: var(--text-body); }

.book-detail-meta dt {
  font-weight: 500;
  color: var(--text-muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: var(--space-sm);
}

.book-detail-meta dd {
  color: var(--text-primary);
  font-size: 15px;
  margin-top: 2px;
}

.book-detail-right h1 {
  font-size: 44px;
  line-height: 1.15;
  margin-bottom: var(--space-md);
}

.book-detail-right .book-synopsis { margin-bottom: var(--space-lg); }

.book-detail-right .book-synopsis p {
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-body);
  margin-bottom: var(--space-sm);
}

.book-detail-buttons {
  display: flex;
  gap: var(--space-sm);
  align-items: center;
  flex-wrap: wrap;
  margin-top: var(--space-lg);
}
.book-detail-buttons .btn { padding: 16px 36px; }

.share-link {
  font-size: 14px;
  color: var(--text-muted);
  margin-left: var(--space-xs);
  transition: color var(--transition-fast);
}
.share-link:hover { color: var(--gold); }

.book-preview-placeholder {
  margin-top: var(--space-xl);
  padding: var(--space-xl);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  text-align: center;
  color: var(--text-muted);
  font-size: 14px;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

/* #5 Related Books */
.related-books {
  margin-top: var(--space-3xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--border-color);
}

.related-books h3 {
  font-size: 24px;
  margin-bottom: var(--space-lg);
}

.related-books-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.related-book-card {
  border: 1px solid var(--border-color);
  padding: var(--space-sm);
  display: flex;
  gap: var(--space-sm);
  cursor: pointer;
  transition: border-color var(--transition-fast);
  background-color: var(--bg-primary);
}
.related-book-card:hover { border-color: var(--gold); }

.related-book-card img {
  width: 70px;
  height: 100px;
  object-fit: cover;
  flex-shrink: 0;
}

.related-book-info h4 {
  font-size: 15px;
  margin-bottom: 4px;
  line-height: 1.3;
}

.related-book-info .book-author {
  font-size: 12px;
  color: var(--text-muted);
}

/* ============================================
   #2 ECONOMIA AUSTRÍACA PAGE
   ============================================ */
.page-economia { display: none; }

.economia-hero {
  padding: var(--space-3xl) 0;
  text-align: center;
}
.economia-hero h1 { font-size: 48px; margin-bottom: var(--space-md); }
.economia-hero p {
  font-size: 18px;
  line-height: 1.7;
  color: var(--text-body);
  max-width: 720px;
  margin: 0 auto;
}

.economia-timeline {
  padding: 0 0 var(--space-4xl);
}

.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  padding-left: 80px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 35px;
  top: 0;
  bottom: 0;
  width: 1px;
  background-color: var(--border-color);
}

.timeline-item {
  position: relative;
  padding-bottom: var(--space-xl);
  display: flex;
  gap: var(--space-md);
}

.timeline-item:last-child { padding-bottom: 0; }

.timeline-item::before {
  content: '';
  position: absolute;
  left: -49px;
  top: 6px;
  width: 8px;
  height: 8px;
  background-color: var(--gold);
  border-radius: 50%;
}

.timeline-year {
  position: absolute;
  left: -80px;
  top: 0;
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--gold);
  width: 50px;
  text-align: right;
}

.timeline-content h3 {
  font-size: 22px;
  margin-bottom: 4px;
}

.timeline-content .timeline-role {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--gold);
  margin-bottom: var(--space-sm);
  font-weight: 500;
}

.timeline-content p:last-child {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-body);
}

.economia-cta {
  max-width: 800px;
  margin: var(--space-3xl) auto 0;
  text-align: center;
}

.economia-cta p {
  font-size: 16px;
  color: var(--text-body);
  margin-bottom: var(--space-md);
}

/* ============================================
   SOBRE / ABOUT
   ============================================ */
.page-sobre { display: none; }

.about-hero {
  padding: var(--space-3xl) 0;
  text-align: center;
}
.about-hero h1 { font-size: 48px; margin-bottom: var(--space-md); }
.about-hero p {
  font-size: 18px;
  line-height: 1.7;
  color: var(--text-body);
  max-width: 700px;
  margin: 0 auto var(--space-md);
}

.about-content { padding: 0 0 var(--space-4xl); }
.about-content .container { max-width: 1180px; }
.about-layout {
  display: grid;
  grid-template-columns: minmax(300px, 420px) minmax(0, 1fr);
  gap: var(--space-3xl);
  align-items: start;
}
.about-visual {
  position: sticky;
  top: calc(var(--navbar-height) + var(--space-lg));
  margin: 0;
  height: auto;
  aspect-ratio: 181 / 256;
  border-radius: 8px;
  overflow: hidden;
  background-color: var(--bg-secondary);
  box-shadow: var(--shadow-lg);
}
.about-visual img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.about-copy {
  max-width: 720px;
}
.about-content h3 { margin-top: var(--space-xl); margin-bottom: var(--space-sm); }
.about-content p {
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-body);
  margin-bottom: var(--space-md);
}

/* ============================================
   #8 CONTATO PAGE
   ============================================ */
.page-contato { display: none; }

.contact-hero {
  padding: var(--space-3xl) 0;
  text-align: center;
}
.contact-hero h1 { font-size: 48px; margin-bottom: var(--space-md); }
.contact-hero p {
  font-size: 18px;
  line-height: 1.7;
  color: var(--text-body);
  max-width: 600px;
  margin: 0 auto;
}

.contact-form-section { padding: 0 0 var(--space-4xl); }

.contact-form {
  max-width: 600px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: var(--space-md);
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--border-color);
  font-size: 15px;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: border-color var(--transition-fast), background-color var(--transition-fast), color var(--transition-fast);
  resize: vertical;
}

.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--text-muted); }

.form-group input:focus,
.form-group textarea:focus { border-color: var(--gold); }

.contact-form .btn { width: 100%; justify-content: center; margin-top: var(--space-xs); }

.form-success {
  text-align: center;
  padding: var(--space-xl) 0;
  color: var(--gold);
  font-size: 16px;
  font-weight: 500;
  display: none;
}

/* ============================================
   FOOTER — #13 Refined Typography
   ============================================ */
.site-footer {
  background-color: var(--bg-footer);
  color: var(--color-gray-silver);
  padding: var(--space-2xl) 0 var(--space-md);
  transition: background-color var(--transition-fast);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid #2A2A2A;
}

.footer-brand {
  font-family: var(--font-serif);
  font-size: 16px;
  color: var(--gold);
  margin-bottom: var(--space-sm);
  letter-spacing: 0.15em;
  font-weight: 600;
}

.footer-about p {
  font-size: 13px;
  line-height: 1.8;
  color: var(--color-gray-silver);
  margin-bottom: var(--space-md);
  max-width: 300px;
}

.newsletter-form { display: flex; gap: 0; }

.newsletter-form input {
  flex: 1;
  padding: 10px 14px;
  font-size: 13px;
  background-color: #1A1A1A;
  border: 1px solid #2A2A2A;
  color: var(--color-white);
  min-width: 0;
}
.newsletter-form input::placeholder { color: #666; }

.newsletter-form button {
  padding: 10px 18px;
  font-size: 13px;
  font-weight: 500;
  background-color: var(--gold);
  color: var(--color-black-deep);
  cursor: pointer;
  white-space: nowrap;
  transition: background-color var(--transition-fast);
}
.newsletter-form button:hover { background-color: var(--gold-accent); }

.footer-column h5 {
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-white);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-sm);
}

.footer-column ul li { margin-bottom: 10px; }

.footer-column ul li a {
  font-size: 13px;
  color: var(--color-gray-silver);
  transition: color var(--transition-fast);
}
.footer-column ul li a:hover { color: var(--gold); }

.social-links { display: flex; gap: var(--space-sm); }

.social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  border: 1px solid #2A2A2A;
  color: var(--color-gray-silver);
  transition: all var(--transition-fast);
}
.social-links a:hover { border-color: var(--gold); color: var(--gold); }
.social-links a svg { width: 16px; height: 16px; fill: currentColor; }

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: var(--space-md);
}
.footer-bottom p { font-size: 12px; color: #555; }

/* ============================================
   #9 BACK TO TOP
   ============================================ */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  color: var(--text-muted);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast), visibility var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast), color var(--transition-fast);
  z-index: 900;
  border-radius: 50%;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  border-color: var(--gold);
  color: var(--gold);
}

/* ============================================
   THEORY PAGES
   ============================================ */

/* Theory Hero */
.theory-hero {
  padding: calc(var(--navbar-height) + var(--space-2xl)) 0 var(--space-2xl);
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.theory-hero-grid {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: var(--space-2xl);
  align-items: start;
  margin-top: var(--space-lg);
}

.theory-hero-cover {
  position: sticky;
  top: calc(var(--navbar-height) + var(--space-lg));
}

.theory-hero-cover img {
  width: 100%;
  border-radius: 6px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.18);
  transition: transform var(--transition-base);
}

.theory-hero-cover img:hover {
  transform: scale(1.03);
}

.theory-badge {
  display: inline-block;
  padding: 4px 14px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--gold);
  border: 1px solid var(--gold);
  border-radius: 20px;
  margin-bottom: var(--space-sm);
}

.theory-hero-info h1 {
  font-size: 40px;
  line-height: 1.15;
  margin-bottom: var(--space-xs);
}

.theory-subtitle {
  font-size: 18px;
  color: var(--text-muted);
  font-style: italic;
  margin-bottom: var(--space-md);
  line-height: 1.5;
}

.theory-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  font-size: 13px;
  color: var(--text-muted);
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--border-color);
}

.theory-meta-row span:not(:last-child)::after {
  content: '·';
  margin-left: var(--space-md);
  color: var(--gold);
}

.theory-lead {
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}

.theory-actions {
  display: flex;
  gap: var(--space-sm);
}

/* Theory Table of Contents */
.theory-toc {
  padding: var(--space-2xl) 0;
  border-bottom: 1px solid var(--border-color);
}

.theory-toc h2 {
  font-size: 24px;
  margin-bottom: var(--space-lg);
}

.toc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-lg);
}

.toc-part {
  padding: var(--space-lg);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  transition: border-color var(--transition-fast);
}

.toc-part:hover {
  border-color: var(--gold-subtle);
}

.toc-part h4 {
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--gold);
  margin-bottom: var(--space-sm);
}

.toc-part ol {
  padding-left: 20px;
  margin: 0;
}

.toc-part li {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  padding: 2px 0;
}

/* Theory Body Sections */
.theory-body {
  padding: var(--space-2xl) 0 var(--space-3xl);
}

.theory-section {
  margin-bottom: var(--space-3xl);
  padding-bottom: var(--space-2xl);
  border-bottom: 1px solid var(--border-color);
}

.theory-section:last-child {
  border-bottom: none;
  margin-bottom: 0;
}

.theory-section h2 {
  font-size: 28px;
  margin-bottom: var(--space-md);
  position: relative;
  display: inline-block;
}

.theory-section h2::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 40px;
  height: 2px;
  background-color: var(--gold);
}

.theory-section > p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
  max-width: 780px;
}

/* Theory Callout */
.theory-callout {
  padding: var(--space-lg) var(--space-xl);
  border-left: 3px solid var(--gold);
  background: linear-gradient(135deg, rgba(201,169,97,0.06), transparent);
  border-radius: 0 8px 8px 0;
  margin-bottom: var(--space-lg);
}

.theory-callout p {
  font-size: 17px;
  line-height: 1.7;
  color: var(--text-primary);
  font-style: italic;
  margin: 0;
}

/* Theory Concept Cards */
.theory-cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.theory-cards-grid.cols-2 {
  grid-template-columns: repeat(2, 1fr);
}

.theory-concept-card {
  padding: var(--space-lg);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  transition: border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.theory-concept-card:hover {
  border-color: var(--gold-subtle);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
}

.concept-icon {
  font-size: 28px;
  margin-bottom: var(--space-sm);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(201,169,97,0.1);
  border-radius: 10px;
}

.theory-concept-card h4 {
  font-size: 17px;
  margin-bottom: var(--space-xs);
  color: var(--text-primary);
}

.theory-concept-card p {
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-secondary);
}

.concept-detail {
  margin-top: var(--space-sm);
  padding-top: var(--space-sm);
  border-top: 1px solid var(--border-color);
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Chart Container */
.chart-container {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.chart-title {
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  margin-bottom: var(--space-md);
}

.chart-area {
  width: 100%;
  min-height: 280px;
  position: relative;
}

.chart-area svg {
  width: 100%;
  height: 100%;
}

.chart-source {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: var(--space-sm);
  font-style: italic;
}

/* Data Tables */
.theory-data-table {
  overflow-x: auto;
  margin-bottom: var(--space-lg);
}

.theory-data-table table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.theory-data-table thead th {
  background-color: var(--bg-secondary);
  padding: 12px 16px;
  text-align: left;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  border-bottom: 2px solid var(--border-color);
  font-weight: 600;
}

.theory-data-table tbody td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
  line-height: 1.5;
}

.theory-data-table tbody tr:hover {
  background-color: rgba(201,169,97,0.04);
}

.theory-data-table tbody tr:last-child td {
  border-bottom: none;
}

.highlight-cell {
  color: var(--gold) !important;
  font-weight: 700;
}

/* Conflict Grid */
.theory-conflict-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.conflict-item {
  display: flex;
  gap: var(--space-md);
  align-items: center;
  padding: var(--space-md) var(--space-lg);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
}

.conflict-num {
  font-family: 'Inter', sans-serif;
  font-size: 28px;
  font-weight: 800;
  color: var(--gold);
  flex-shrink: 0;
  min-width: 40px;
  text-align: center;
}

.conflict-item p {
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-secondary);
  margin: 0;
}

/* Principles List */
.principles-list {
  margin-bottom: var(--space-lg);
}

.principle-item {
  display: flex;
  gap: var(--space-xl);
  align-items: start;
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--border-color);
}

.principle-item:last-child {
  border-bottom: none;
}

.principle-num {
  font-family: 'Inter', sans-serif;
  font-size: 24px;
  font-weight: 800;
  color: var(--gold);
  min-width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--gold);
  border-radius: 50%;
  flex-shrink: 0;
}

.principle-item h4 {
  font-size: 18px;
  margin-bottom: 4px;
}

.principle-item p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-secondary);
}

/* Cycle Phases */
.cycle-phases {
  position: relative;
  margin-bottom: var(--space-lg);
}

.phase-item {
  padding: var(--space-lg);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  margin-bottom: var(--space-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.phase-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, var(--gold), transparent);
}

.phase-item:hover {
  border-color: var(--gold-subtle);
  box-shadow: 0 4px 16px rgba(0,0,0,0.06);
}

.phase-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-sm);
}

.phase-num {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--gold);
  color: #0D0D0D;
  font-weight: 800;
  font-size: 16px;
  border-radius: 50%;
  flex-shrink: 0;
}

.phase-header h4 {
  font-size: 17px;
  margin: 0;
}

.phase-item > p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-secondary);
  margin: 0;
  padding-left: 52px;
}

/* Compact Timeline */
.theory-timeline-compact {
  margin-bottom: var(--space-lg);
}

.timeline-compact-item {
  display: grid;
  grid-template-columns: 60px 1fr auto;
  gap: var(--space-md);
  align-items: center;
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-fast);
}

.timeline-compact-item:hover {
  background-color: rgba(201,169,97,0.04);
}

.tc-year {
  font-family: 'Inter', sans-serif;
  font-size: 15px;
  font-weight: 700;
  color: var(--gold);
}

.tc-event {
  font-size: 14px;
  color: var(--text-primary);
}

.tc-impact {
  font-size: 12px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 12px;
  white-space: nowrap;
}

.tc-impact.impact-down {
  background-color: rgba(220, 50, 50, 0.1);
  color: #dc3232;
}

[data-theme="dark"] .tc-impact.impact-down {
  background-color: rgba(255, 100, 100, 0.15);
  color: #ff7070;
}

/* Formula Display */
.theory-formula {
  text-align: center;
  padding: var(--space-xl);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  margin-bottom: var(--space-lg);
}

.theory-formula code {
  font-family: 'Courier New', Courier, monospace;
  font-size: 20px;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: 1px;
}

/* ============================================
   PAGE TRANSITION
   ============================================ */
.page { animation: fadeIn 0.3s ease; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============================================
   RESPONSIVE
   ============================================ */

/* Tablet */
@media (max-width: 1024px) {
  .container { padding: 0 var(--space-xl); }

  .hero .container { grid-template-columns: 1fr; gap: var(--space-xl); }
  .hero-text h1 { font-size: 42px; }
  .hero { padding: var(--space-3xl) 0; }
  .hero-image { max-width: 600px; margin: 0 auto; }

  .books-grid { grid-template-columns: repeat(2, 1fr); }

  .mission-layout {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .mission-copy {
    max-width: 760px;
  }

  .mission-visual {
    width: min(100%, 520px);
    height: auto;
    aspect-ratio: 2 / 3;
    justify-self: center;
  }

  .about-layout {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .about-visual {
    position: static;
    width: min(100%, 520px);
    height: auto;
    aspect-ratio: 181 / 256;
    justify-self: center;
  }

  .about-copy {
    max-width: 760px;
  }

  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--space-lg); }

  .book-detail-grid { grid-template-columns: 1fr; }

  .book-detail-left {
    position: static;
    display: flex;
    gap: var(--space-lg);
    align-items: start;
  }

  .book-detail-cover { max-width: 250px; flex-shrink: 0; }
  .book-detail-right h1 { font-size: 36px; }

  .related-books-grid { grid-template-columns: repeat(2, 1fr); }

  .timeline { padding-left: 60px; }
  .timeline::before { left: 25px; }
  .timeline-item::before { left: -39px; }
  .timeline-year { left: -60px; font-size: 14px; width: 40px; }

  /* Theory pages tablet */
  .theory-hero-grid { grid-template-columns: 180px 1fr; gap: var(--space-xl); }
  .theory-hero-info h1 { font-size: 34px; }
  .theory-cards-grid { grid-template-columns: repeat(2, 1fr); }
  .theory-conflict-grid { grid-template-columns: 1fr; }
  .toc-grid { grid-template-columns: repeat(2, 1fr); }
}

/* Mobile */
@media (max-width: 768px) {
  :root { --navbar-height: 56px; }
  .container { padding: 0 var(--space-md); }
  h1 { font-size: 36px; }
  h2 { font-size: 30px; }

  .navbar-links {
    display: none;
    position: fixed;
    top: var(--navbar-height);
    left: 0; right: 0;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: var(--space-md);
    gap: var(--space-sm);
  }
  .navbar-links.active { display: flex; }
  .mobile-nav-toggle { display: flex; }

  .hero-text h1 { font-size: 34px; }
  .hero-tagline { font-size: 15px; }
  .hero-buttons { flex-direction: column; align-items: stretch; }
  .btn { text-align: center; justify-content: center; }

  .counters-grid { grid-template-columns: repeat(3, 1fr); gap: var(--space-sm); }
  .counter-number { font-size: 32px; }

  .books-grid { grid-template-columns: 1fr; }

  .daily-quote p { font-size: 20px; }

  .book-list-item { grid-template-columns: 80px 1fr; gap: var(--space-sm); }
  .book-list-action { grid-column: 2; }
  .book-list-cover { width: 80px; height: 120px; }

  .search-input { width: 100%; }
  .library-controls { flex-direction: column; align-items: stretch; }
  .sort-select { margin-left: 0; }

  .footer-grid { grid-template-columns: 1fr; }

  .hero { padding: var(--space-2xl) 0; }
  .featured-books { padding: var(--space-2xl) 0; }
  .mission { padding: var(--space-2xl) 0; }
  .mission-copy .gold-line { margin-left: 0; }
  .mission-visual { width: 100%; }
  .about-content { padding-bottom: var(--space-2xl); }
  .about-visual { width: 100%; }

  .book-detail-grid { grid-template-columns: 1fr; }
  .book-detail-left { flex-direction: column; align-items: center; text-align: center; }
  .book-detail-right h1 { font-size: 30px; }
  .book-detail-buttons { flex-direction: column; align-items: stretch; }

  .related-books-grid { grid-template-columns: 1fr; }

  .about-hero h1 { font-size: 36px; }
  .economia-hero h1 { font-size: 36px; }
  .contact-hero h1 { font-size: 36px; }

  .timeline { padding-left: 50px; }
  .timeline::before { left: 15px; }
  .timeline-item::before { left: -39px; }
  .timeline-year { left: -50px; font-size: 13px; width: 35px; }
  .timeline-content h3 { font-size: 20px; }

  /* Theory pages mobile */
  .theory-hero-grid { grid-template-columns: 1fr; }
  .theory-hero-cover { position: static; max-width: 200px; margin: 0 auto; }
  .theory-hero-info h1 { font-size: 28px; }
  .theory-subtitle { font-size: 15px; }
  .theory-cards-grid, .theory-cards-grid.cols-2 { grid-template-columns: 1fr; }
  .theory-conflict-grid { grid-template-columns: 1fr; }
  .theory-section h2 { font-size: 24px; }
  .theory-formula code { font-size: 14px; }
  .theory-actions { flex-direction: column; align-items: stretch; }
  .toc-grid { grid-template-columns: 1fr; }
  .phase-item > p { padding-left: var(--space-md); }
  .timeline-compact-item { grid-template-columns: 50px 1fr; }
  .tc-impact { display: none; }
  .principle-item { gap: var(--space-md); }
  .principle-num { min-width: 40px; height: 40px; font-size: 18px; }
}

/* Small phones */
@media (max-width: 480px) {
  .hero-text h1 { font-size: 28px; }
  .section-header h2 { font-size: 28px; }
  .book-card-image { height: 260px; }
  .book-card-image img { width: 160px; height: 230px; }
  .counter-number { font-size: 28px; }
  .counter-label { font-size: 11px; }
}