:root {
  --bg: #f5f7ff;
  --bg-soft: #eef3ff;
  --card: #ffffff;
  --text: #111827;
  --text-muted: #4b5563;
  --accent: #6d28d9;
  --accent-light: #8b5cf6;
  --accent-strong: #1d4ed8;
  --border: #dbeafe;
  --shadow: 0 20px 60px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, system-ui, sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top left, rgba(99, 102, 241, 0.15), transparent 30%),
              radial-gradient(circle at bottom right, rgba(59, 130, 246, 0.14), transparent 25%),
              linear-gradient(180deg, #f8fbff 0%, #eef2ff 100%);
}

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

a {
  color: inherit;
}

.site-header {
  position: relative;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(59, 130, 246, 0.12);
  padding: 1.1rem 1.5rem;
}

.site-header.compact {
  padding-top: 0.9rem;
  padding-bottom: 0.9rem;
}

.site-header .brand {
  display: flex;
  align-items: center;
  gap: 1rem;
  max-width: 1280px;
  margin: 0 auto;
}

.brand-image {
  width: 72px;
  height: 72px;
}

.brand .eyebrow {
  margin: 0 0 0.35rem;
  font-size: 0.9rem;
  color: var(--accent);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.brand h1 {
  margin: 0;
  font-size: clamp(1.6rem, 2vw, 2.4rem);
  line-height: 1.05;
}

.main-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin: 1.2rem auto 0;
  max-width: 1280px;
  padding: 0 1rem;
}

.main-nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.1rem;
  border-radius: 999px;
  border: 1px solid transparent;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  font-size: 0.95rem;
  transition: all 0.2s ease;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--accent-strong);
  border-color: rgba(99, 102, 241, 0.2);
  box-shadow: 0 8px 20px rgba(99, 102, 241, 0.12);
  background: #ffffff;
}

.site-header-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1rem;
}

.header-actions {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
}

.icon-button {
  width: 3rem;
  height: 3rem;
  border: none;
  border-radius: 1rem;
  background: rgba(59, 130, 246, 0.12);
  color: var(--accent-strong);
  font-size: 1.1rem;
  cursor: pointer;
}

.hero-panel,
.detail-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  gap: 2rem;
  max-width: 1280px;
  margin: 2rem auto;
  padding: 0 1rem;
}

.hero-panel {
  position: relative;
  align-items: center;
}

.auth-page {
  max-width: 1280px;
  margin: 0 auto 4rem;
  padding: 2rem 0 0;
  position: relative;
}

.auth-page::before {
  content: '';
  position: absolute;
  top: 0;
  right: 10%;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: rgba(124, 58, 237, 0.12);
  filter: blur(32px);
  z-index: 0;
}

.auth-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(380px, 0.9fr);
  gap: 2.5rem;
  align-items: center;
  padding: 0 1rem;
  position: relative;
  z-index: 1;
}

.auth-intro {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.auth-intro h2 {
  margin: 0;
  font-size: clamp(2.4rem, 4vw, 3.4rem);
  color: var(--accent-strong);
}

.auth-intro p {
  margin: 0;
  max-width: 640px;
  line-height: 1.75;
  color: var(--text-muted);
}

.auth-card {
  background: #ffffff;
  border: 1px solid rgba(59, 130, 246, 0.12);
  border-radius: 2rem;
  padding: 2rem;
  box-shadow: 0 30px 60px rgba(15, 23, 42, 0.09);
}

.auth-card h3 {
  margin: 0 0 0.75rem;
  color: var(--accent-strong);
}

.auth-card p {
  margin: 0 0 1.75rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.auth-form {
  display: grid;
  gap: 1.2rem;
}

.auth-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.auth-card {
  min-height: 520px;
}

.auth-card .auth-form {
  margin-top: 0.5rem;
}

.input-group {
  display: grid;
  gap: 0.55rem;
}

.input-group label {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.input-group input,
.input-group select {
  width: 100%;
  padding: 1rem 1.1rem;
  border: 1px solid rgba(148, 163, 184, 0.35);
  border-radius: 1rem;
  background: #fbfdff;
  font-size: 1rem;
  color: var(--text);
}

.form-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.checkbox-field {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.checkbox-field input {
  width: auto;
  margin: 0;
}

.form-link {
  color: var(--accent-strong);
  text-decoration: none;
  font-weight: 700;
}

.login-note {
  margin: 1.25rem 0 0;
  color: var(--text-muted);
}

.auth-hero {
  display: flex;
  justify-content: center;
}

.auth-hero img {
  width: 100%;
  max-width: 520px;
  border-radius: 1.75rem;
  box-shadow: 0 28px 60px rgba(15, 23, 42, 0.18);
  animation: float 8s ease-in-out infinite;
}

.social-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  width: 100%;
  padding: 1rem 1.2rem;
  border-radius: 1rem;
  border: 1px solid rgba(99, 102, 241, 0.18);
  background: #ffffff;
  color: var(--text);
  font-weight: 700;
}

.social-button::before {
  content: 'G';
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 0.9rem;
  background: rgba(59, 130, 246, 0.12);
  color: var(--accent-strong);
  font-weight: 700;
}

.site-header.compact {
  padding-top: 1rem;
  padding-bottom: 1rem;
}

.hero-panel::before {
  content: '';
  position: absolute;
  left: -4%;
  top: 10%;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: rgba(124, 58, 237, 0.12);
  filter: blur(30px);
  z-index: 0;
}

.hero-panel::after {
  content: '';
  position: absolute;
  right: 4%;
  bottom: -12%;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: rgba(37, 99, 235, 0.14);
  filter: blur(35px);
  z-index: 0;
}

.hero-copy {
  position: relative;
  z-index: 1;
  padding: 2.5rem 0;
}

.small-label {
  margin: 0 0 1rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 0.9rem;
  background: rgba(59, 130, 246, 0.12);
  color: var(--accent-strong);
  font-weight: 700;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.78rem;
}

.hero-copy h2,
.detail-hero h2 {
  margin: 0 0 1rem;
  font-size: clamp(2.4rem, 4vw, 3.4rem);
  line-height: 1.05;
  color: var(--accent-strong);
}

.hero-copy p,
.detail-hero p {
  margin: 0 0 1.5rem;
  color: var(--text-muted);
  max-width: 720px;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.95rem 1.5rem;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 700;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  background: linear-gradient(135deg, #7c3aed, #2563eb);
  color: #fff;
  box-shadow: 0 18px 30px rgba(99, 102, 241, 0.2);
}

.button-secondary {
  background: rgba(59, 130, 246, 0.08);
  color: var(--accent-strong);
  border: 1px solid rgba(59, 130, 246, 0.18);
}

.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
}

.hero-visual img {
  width: 100%;
  max-width: 520px;
  border-radius: 1.75rem;
  box-shadow: 0 28px 60px rgba(15, 23, 42, 0.2);
  animation: float 8s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.metrics-row {
  display: grid;
  grid-template-columns: repeat(5, minmax(140px, 1fr));
  gap: 1rem;
  max-width: 1280px;
  margin: 0 auto 2rem;
  padding: 0 1rem;
}

.metric-card {
  background: #ffffff;
  border: 1px solid rgba(59, 130, 246, 0.12);
  border-radius: 1.75rem;
  padding: 1.25rem 1rem;
  text-align: center;
  box-shadow: 0 24px 40px rgba(15, 23, 42, 0.06);
}

.metric-card strong {
  display: block;
  font-size: 1.45rem;
  color: var(--accent-strong);
  margin-bottom: 0.35rem;
}

.metric-card span {
  display: block;
  color: var(--text-muted);
  font-size: 0.94rem;
}

.page-content {
  max-width: 1600px;
  margin: 0 auto 3rem;
  padding: 0 3rem;
}

.section-intro {
  text-align: center;
  margin-top: 0;
  margin-bottom: 2rem;
  padding: 2rem 1.5rem;
  background: linear-gradient(180deg, rgba(99, 102, 241, 0.08), rgba(255, 255, 255, 0.8));
  border-radius: 2rem;
  border: 1px solid rgba(99, 102, 241, 0.14);
  box-shadow: 0 20px 50px rgba(15, 23, 42, 0.05);
}

.section-intro h2 {
  margin-bottom: 0.75rem;
  font-size: clamp(2rem, 2.5vw, 2.8rem);
  color: var(--accent);
}

.section-intro p {
  margin: 0 auto;
  max-width: 740px;
  line-height: 1.8;
  color: var(--text-muted);
}

.cards-grid,
.list-grid {
  display: grid;
  gap: 1.5rem;
}

.cards-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.spotlight-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  max-width: 1280px;
  margin: 0 auto 2rem;
  padding: 0 1rem;
}

.spotlight-card {
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.08), rgba(37, 99, 235, 0.05));
  border: 1px solid rgba(59, 130, 246, 0.18);
  border-radius: 1.75rem;
  padding: 1.5rem;
  box-shadow: 0 24px 45px rgba(15, 23, 42, 0.06);
  position: relative;
  overflow: hidden;
}

.spotlight-card::before {
  content: '';
  position: absolute;
  right: -30px;
  top: -30px;
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: rgba(99, 102, 241, 0.18);
  filter: blur(15px);
}

.spotlight-card h3 {
  margin: 0 0 0.5rem;
  color: var(--accent-strong);
}

.spotlight-card p {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.7;
}

.feature-card,
.detail-card {
  background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
  border: 1px solid rgba(59, 130, 246, 0.14);
  border-radius: 1.5rem;
  padding: 1.75rem;
  box-shadow: 0 24px 40px rgba(15, 23, 42, 0.08);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.feature-card img {
  width: 72px;
  height: 72px;
}

.feature-card h3,
.detail-card h4 {
  margin: 0;
  color: var(--accent-strong);
}

.feature-card p,
.detail-card p {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.75;
}

.feature-card a,
.detail-hero .button {
  width: fit-content;
}

.feature-card a {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--accent-strong);
  font-weight: 700;
  text-decoration: none;
}

.feature-card a::after {
  content: '→';
  transition: transform 0.2s ease;
}

.feature-card a:hover::after {
  transform: translateX(5px);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 30px 60px rgba(15, 23, 42, 0.12);
}

.site-footer {
  padding: 2rem 1rem;
  text-align: center;
  color: var(--text-muted);
}

.footer-actions {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

.footer-actions .button {
  min-width: 170px;
}

.library-grid {
  display: grid;
  grid-template-columns: minmax(260px, 1fr) minmax(0, 2.2fr) minmax(280px, 1fr);
  gap: 1.75rem;
  align-items: start;
  margin-top: 1.5rem;
}

.categories-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(220px, 1fr));
  justify-items: stretch;
  gap: 1rem;
  margin-top: 1rem;
}

.category-card {
  background: #ffffff;
  border: 1px solid rgba(148, 163, 184, 0.16);
  border-radius: 1.75rem;
  padding: 1.4rem 1.4rem;
  display: grid;
  place-items: center;
  gap: 0.75rem;
  text-align: center;
  min-width: 0;
  min-height: 130px;
  width: 100%;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.06);
}

.library-sidebar,
.library-rightpanel {
  background: #ffffff;
  border: 1px solid rgba(59, 130, 246, 0.08);
  border-radius: 2rem;
  padding: 1.5rem;
  box-shadow: 0 24px 50px rgba(15, 23, 42, 0.06);
}

.library-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.sidebar-brand img {
  width: 48px;
  height: 48px;
  border-radius: 1rem;
  background: rgba(59, 130, 246, 0.1);
  padding: 0.65rem;
}

.sidebar-brand h2 {
  margin: 0;
  font-size: 1.4rem;
}

.sidebar-nav {
  display: grid;
  gap: 0.65rem;
}

.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.95rem 1rem;
  border-radius: 1rem;
  color: var(--text);
  background: rgba(59, 130, 246, 0.05);
  text-decoration: none;
  transition: background 0.2s ease, transform 0.2s ease;
  min-width: 0;
  word-break: break-word;
}

.sidebar-nav a:hover {
  transform: translateX(2px);
}

.sidebar-nav a.active,
.sidebar-nav a:hover {
  background: rgba(59, 130, 246, 0.16);
}

.nav-icon {
  display: inline-flex;
  width: 2.3rem;
  height: 2.3rem;
  align-items: center;
  justify-content: center;
  border-radius: 0.9rem;
  background: rgba(59, 130, 246, 0.14);
  color: var(--accent-strong);
  font-size: 1rem;
}

.sidebar-card {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  padding: 1.25rem;
  background: linear-gradient(180deg, rgba(99, 102, 241, 0.08), #ffffff);
  border: 1px solid rgba(99, 102, 241, 0.16);
  border-radius: 1.5rem;
}

.sidebar-card strong {
  font-size: 1rem;
}

.library-main {
  display: grid;
  gap: 1.5rem;
}

.library-hero-card {
  background: #ffffff;
  border: 1px solid rgba(59, 130, 246, 0.08);
  border-radius: 2rem;
  padding: 1.5rem;
  box-shadow: 0 24px 50px rgba(15, 23, 42, 0.06);
}

.search-row {
  display: grid;
  gap: 1rem;
}

.search-field {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.75rem;
  align-items: center;
  margin-bottom: 1.25rem;
  min-width: 0;
}

.search-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  background: rgba(59, 130, 246, 0.12);
  border-radius: 1rem;
  color: var(--accent-strong);
  font-size: 1.1rem;
}

.search-field input {
  width: 100%;
  min-width: 0;
  padding: 1rem 1.2rem;
  border: 1px solid rgba(148, 163, 184, 0.35);
  border-radius: 1rem;
  font-size: 0.95rem;
}

.filter-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.filter-input {
  display: grid;
  gap: 0.45rem;
}

.filter-input label {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.filter-input select {
  width: 100%;
  padding: 0.95rem 1rem;
  border: 1px solid rgba(148, 163, 184, 0.35);
  border-radius: 1rem;
  background: #fbfdff;
}

.category-icon {
  width: 3.2rem;
  height: 3.2rem;
  display: grid;
  place-items: center;
  border-radius: 1rem;
  background: #eef2ff;
  color: var(--accent-strong);
  font-size: 1.2rem;
  flex-shrink: 0;
}

.category-copy {
  display: grid;
  gap: 0.2rem;
  width: 100%;
}

.category-copy strong {
  font-size: 1rem;
  color: var(--accent-strong);
}

.category-copy p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.category-card strong {
  display: block;
  margin: 0;
  color: var(--accent-strong);
  word-break: break-word;
}

.category-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
  word-break: break-word;
}

.category-math .category-icon { background: rgba(99, 102, 241, 0.14); }
.category-science .category-icon { background: rgba(16, 185, 129, 0.14); }
.category-comm .category-icon { background: rgba(59, 130, 246, 0.14); }
.category-history .category-icon { background: rgba(249, 115, 22, 0.14); }
.category-english .category-icon { background: rgba(124, 58, 237, 0.14); }
.category-tech .category-icon { background: rgba(14, 165, 233, 0.14); }

.books-section {
  display: grid;
  gap: 1.25rem;
}

.books-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.books-header h3 {
  margin: 0;
}

.books-header a {
  color: var(--accent-strong);
  text-decoration: none;
  font-weight: 700;
}

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

.book-card {
  background: #ffffff;
  border: 1px solid rgba(59, 130, 246, 0.08);
  border-radius: 1.75rem;
  padding: 1.25rem;
  display: grid;
  gap: 1rem;
  min-width: 0;
}

.book-icon {
  width: 3rem;
  height: 3rem;
  display: grid;
  place-items: center;
  border-radius: 1rem;
  font-weight: 700;
  color: #fff;
}

.book-math { background: #4338ca; }
.book-science { background: #16a34a; }
.book-history { background: #d97706; }
.book-comm { background: #2563eb; }
.book-english { background: #7c3aed; }
.book-physics { background: #0f766e; }

.book-category {
  margin: 0 0 0.35rem;
  font-size: 0.85rem;
  color: var(--accent);
}

.book-card h4 {
  margin: 0;
  font-size: 1.1rem;
  word-break: break-word;
}

.book-grade {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
  word-break: break-word;
}

.book-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.book-actions span {
  background: rgba(59, 130, 246, 0.08);
  border-radius: 999px;
  padding: 0.55rem 0.8rem;
  font-size: 0.85rem;
}

.library-rightpanel .panel-card {
  display: grid;
  gap: 1rem;
}

.panel-card h3 {
  margin: 0;
}

.panel-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.8rem;
}

.panel-card li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.9rem 1rem;
  border-radius: 1rem;
  background: #f8fbff;
  color: var(--text-muted);
  position: relative;
}

.panel-card li::before {
  content: attr(data-icon);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 0.75rem;
  background: rgba(59, 130, 246, 0.15);
  color: var(--accent-strong);
  font-size: 1rem;
}

.panel-card li[data-icon] {
  padding-left: 0.75rem;
}

.activity-group ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.8rem;
}

.activity-group li {
  padding: 0.85rem 1rem;
  border-radius: 1rem;
  background: #f8fbff;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.activity-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 0.75rem;
  background: rgba(59, 130, 246, 0.14);
  color: var(--accent-strong);
  font-size: 1rem;
}

.panel-label {
  margin: 0 0 0.5rem;
  font-weight: 700;
  color: var(--accent-strong);
}

.activity-group ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.8rem;
}

.activity-group li {
  padding: 0.85rem 1rem;
  border-radius: 1rem;
  background: #f8fbff;
  color: var(--text-muted);
}

/* ════════════════════════════════════════
   SIDEBAR TOGGLE — global (usado en biblioteca, perfil, resumenes)
   ════════════════════════════════════════ */
.sidebar-toggle {
  display: none;
  align-items: center;
  gap: 0.6rem;
  width: 100%;
  padding: 0.85rem 1.1rem;
  border: 1px solid rgba(99,102,241,0.2);
  border-radius: 1rem;
  background: #ffffff;
  color: var(--accent-strong);
  font-size: 0.93rem;
  font-weight: 700;
  cursor: pointer;
  margin-bottom: 0;
}

.sidebar-toggle .toggle-arrow {
  margin-left: auto;
  transition: transform 0.25s ease;
  font-style: normal;
}

.sidebar-toggle.open .toggle-arrow {
  transform: rotate(180deg);
}

.sidebar-collapsible {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.library-copy h2 {
  margin-bottom: 1rem;
  font-size: clamp(2.4rem, 4vw, 3.2rem);
  color: #1f3bb8;
}

.library-copy p {
  margin-bottom: 1.5rem;
}

.library-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.library-visual img {
  width: 100%;
  max-width: 560px;
  border-radius: 1.75rem;
  box-shadow: 0 28px 50px rgba(15, 23, 42, 0.1);
}

.detail-hero {
  align-items: center;
  background: linear-gradient(180deg, rgba(59, 130, 246, 0.08), rgba(255, 255, 255, 0.7));
  border-radius: 2rem;
  padding: 2rem;
}

.detail-image {
  display: flex;
  align-items: center;
  justify-content: center;
}

.detail-image img {
  width: 100%;
  max-width: 520px;
  border-radius: 1.75rem;
}

.feature-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0;
  display: grid;
  gap: 0.8rem;
}

.feature-list li {
  position: relative;
  padding-left: 2.2rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.feature-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  top: 0.15rem;
  color: var(--accent);
  font-weight: 700;
}

.list-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
}

.list-grid article {
  background: #ffffff;
  border: 1px solid rgba(59, 130, 246, 0.12);
  border-radius: 1.25rem;
  padding: 1.3rem;
  box-shadow: 0 16px 30px rgba(15, 23, 42, 0.05);
}

.list-grid h4 {
  margin: 0 0 0.5rem;
  color: var(--accent-strong);
}

.list-grid p {
  margin: 0;
  color: var(--text-muted);
}

.detail-hero .button {
  margin-top: 1rem;
}

@media (max-width: 1080px) {
  .hero-panel,
  .detail-hero,
  .cards-grid,
  .list-grid,
  .spotlight-grid {
    grid-template-columns: 1fr;
  }

  .main-nav {
    justify-content: center;
  }

  /* Sidebar toggle visible en tablet */
  .sidebar-toggle {
    display: flex;
  }

  .sidebar-collapsible {
    display: none;
  }

  .sidebar-collapsible.open {
    display: flex;
  }

  /* Grids de sidebar colapsan */
  .library-grid {
    grid-template-columns: 1fr;
  }

  .library-sidebar,
  .library-rightpanel {
    padding: 1rem 1.25rem;
    gap: 0;
  }

  /* Auth */
  .auth-layout {
    grid-template-columns: 1fr;
  }

  .auth-hero {
    display: none;
  }

  .auth-card {
    min-height: unset;
  }

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

  /* Métricas */
  .metrics-row {
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  }

  /* Header top */
  .site-header-top {
    flex-direction: column;
    align-items: stretch;
  }

  .header-actions {
    justify-content: flex-start;
    width: 100%;
    flex-wrap: wrap;
  }

  /* Categorías y filtros */
  .categories-row {
    grid-template-columns: repeat(2, 1fr);
  }

  .filter-row {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 720px) {
  .site-header {
    padding: 1rem 1rem 0.85rem;
  }

  .brand {
    flex-direction: column;
    align-items: flex-start;
  }

  .main-nav {
    gap: 0.4rem;
    margin-top: 0.75rem;
    overflow-x: auto;
    flex-wrap: nowrap;
    justify-content: flex-start;
    padding-bottom: 0.4rem;
    scrollbar-width: none;
  }

  .main-nav::-webkit-scrollbar { display: none; }

  .main-nav a {
    flex: 0 0 auto;
    padding: 0.7rem 0.9rem;
    font-size: 0.88rem;
  }

  .hero-panel,
  .detail-hero {
    margin: 1.25rem auto;
    gap: 1.25rem;
    padding: 1.25rem;
  }

  .page-content {
    padding: 0 0.75rem 2rem;
  }

  .feature-card,
  .list-grid article {
    padding: 1.25rem;
  }

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

  .categories-row {
    grid-template-columns: 1fr;
  }

  .search-field {
    grid-template-columns: 1fr;
  }

  .search-field button {
    width: 100%;
  }

  .panel-card li,
  .activity-group li {
    padding: 0.85rem;
  }

  /* Auth móvil */
  .auth-card {
    padding: 1.5rem;
  }

  .form-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  /* Footer */
  .footer-actions {
    flex-direction: column;
    width: 100%;
    padding: 0 1rem;
  }

  .footer-actions .button {
    width: 100%;
    min-width: unset;
  }
}

/* ══════════════════════════════════════
   NAVBAR UNIFICADO (todas las páginas)
══════════════════════════════════════ */
.uni-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 2.5rem;
  background: #ffffff;
  border-bottom: 1px solid rgba(99,102,241,0.1);
  position: sticky;
  top: 0;
  z-index: 100;
  gap: 1rem;
}

.uni-nav-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  flex-shrink: 0;
}

.uni-nav-brand img {
  width: 34px;
  height: 34px;
}

.uni-nav-brand-text strong {
  display: block;
  font-size: 0.95rem;
  color: var(--accent-strong);
  font-weight: 800;
  line-height: 1;
}

.uni-nav-brand-text span {
  font-size: 0.62rem;
  color: var(--accent);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.uni-nav-links {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  list-style: none;
  margin: 0;
  padding: 0;
  flex: 1;
  justify-content: center;
}

.uni-nav-links a {
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  transition: color 0.2s, background 0.2s;
  white-space: nowrap;
}

.uni-nav-links a:hover { color: var(--accent-strong); background: rgba(99,102,241,0.06); }

.uni-nav-links a.active {
  color: var(--accent-strong);
  font-weight: 700;
  background: rgba(99,102,241,0.08);
}

.uni-nav-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-shrink: 0;
}

.uni-icon-btn {
  width: 2.4rem;
  height: 2.4rem;
  border: none;
  border-radius: 0.75rem;
  background: rgba(59,130,246,0.1);
  color: var(--accent-strong);
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}

.uni-icon-btn:hover { background: rgba(59,130,246,0.18); }

@media (max-width: 860px) {
  .uni-nav { padding: 0.75rem 1.25rem; }
  .uni-nav-links { display: none; }
}

@media (max-width: 500px) {
  .uni-nav-actions .button { font-size: 0.82rem; padding: 0.6rem 1rem; }
}