/* =========================================================
   El libro práctico de bases de datos — sistema de diseño
   Concepto: "cuaderno de apuntes" — papel cálido, tinta,
   resaltador y fichas con esquina doblada, pensado para
   una audiencia de estudiantes de FP / universidad.
   ========================================================= */

:root {
  /* Color */
  --paper: #f6eedd;
  --paper-soft: #f0e5cd;
  --card: #fffbf2;
  --ink: #1b3a4b;
  --ink-soft: #3c5a68;
  --ink-faint: #6b8189;
  --accent: #e29a2e;
  --accent-dark: #b97c1d;
  --accent-teal: #3f7d68;
  --accent-brick: #b6482a;
  --edge: #ddc9a3;
  --edge-soft: #e9dcbf;

  /* Type */
  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Karla", "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "Courier New", monospace;

  /* Layout */
  --radius: 10px;
  --shadow-card: 0 2px 0 var(--edge), 0 14px 24px -18px rgba(27, 58, 75, 0.35);
  --container-max: 1120px;
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- Base ---------- */
html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--paper);
  background-image: repeating-linear-gradient(
    to bottom,
    rgba(27, 58, 75, 0.05) 0,
    rgba(27, 58, 75, 0.05) 1px,
    transparent 1px,
    transparent 34px
  );
  color: var(--ink-soft);
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.7;
  padding-top: 104px;
}

h1, h2, h3, h4, h5, .display-font {
  font-family: var(--font-display);
  color: var(--ink);
  font-weight: 600;
  letter-spacing: -0.01em;
}

a {
  color: var(--accent-dark);
}
a:hover {
  color: var(--accent-brick);
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 0.75rem 1.25rem;
  z-index: 2000;
  border-radius: 0 0 8px 0;
}
.skip-link:focus {
  left: 0;
}

:focus-visible {
  outline: 3px solid var(--accent-brick);
  outline-offset: 2px;
}

.container-narrow {
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: 1rem;
  padding-right: 1rem;
}

/* ---------- Franja de avisos (washi tape) ---------- */
.tape-bar {
  background: var(--accent);
  background-image: repeating-linear-gradient(
    -45deg,
    rgba(255, 255, 255, 0.12) 0,
    rgba(255, 255, 255, 0.12) 10px,
    transparent 10px,
    transparent 20px
  );
  border-bottom: 1px dashed rgba(27, 58, 75, 0.35);
}
.tape-bar .carousel-item .text-center {
  min-height: 2.4rem;
  display: flex;
  align-items: center;
  justify-content: center;
}
.tape-bar span {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--ink);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ---------- Navegación ---------- */
#mainNav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1030;
  background: var(--paper);
  border-bottom: 1px solid var(--edge);
  transition: box-shadow 0.2s ease, background-color 0.2s ease;
}
#mainNav.is-scrolled {
  box-shadow: 0 8px 20px -14px rgba(27, 58, 75, 0.45);
}
#mainNav .navbar-brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--ink);
}
#mainNav .navbar-brand .brand-mark {
  color: var(--accent-brick);
}
#mainNav .nav-link {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  padding: 0.4rem 0.85rem;
  border-radius: 6px 6px 0 0;
}
#mainNav .nav-link:hover {
  color: var(--ink);
  background: var(--paper-soft);
}
#mainNav .nav-link.btn-cta {
  background: var(--ink);
  color: var(--paper) !important;
  border-radius: 6px;
}
#mainNav .navbar-toggler {
  border: 1px solid var(--edge);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 0.4rem 0.75rem;
}

/* ---------- Sección genérica ---------- */
.page-section {
  padding: 5.5rem 0;
  position: relative;
}
.page-section.alt {
  background: var(--paper-soft);
}

.section-eyebrow {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-brick);
  margin-bottom: 0.75rem;
}
.section-eyebrow::before,
.section-eyebrow::after {
  content: "";
  height: 1px;
  width: 42px;
  background: var(--edge);
}

.section-title {
  text-align: center;
  font-size: clamp(1.8rem, 1.4rem + 1.6vw, 2.6rem);
  margin-bottom: 3rem;
}
.section-title.on-dark {
  color: var(--paper);
}

/* ---------- Hero ---------- */
.hero {
  padding: 4.5rem 0 5rem;
}
.hero .container-narrow {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
}
@media (max-width: 991.98px) {
  .hero .container-narrow {
    grid-template-columns: 1fr;
    text-align: center;
  }
}
.hero-kicker {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-teal);
  display: inline-block;
  margin-bottom: 1rem;
}
.hero-title {
  font-size: clamp(2.2rem, 1.6rem + 2.6vw, 3.5rem);
  line-height: 1.08;
  margin-bottom: 1rem;
}
.hero-subtitle {
  font-size: 1.15rem;
  color: var(--ink-soft);
  max-width: 46ch;
  margin-bottom: 2rem;
}
@media (max-width: 991.98px) {
  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }
}
.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
@media (max-width: 991.98px) {
  .hero-cta {
    justify-content: center;
  }
}

.hero-figure {
  position: relative;
  display: flex;
  justify-content: center;
}
.hero-figure img {
  max-width: 300px;
  width: 100%;
  border-radius: 4px;
  box-shadow: 0 26px 44px -20px rgba(27, 58, 75, 0.55);
  transform: rotate(-3deg);
}
.hero-figure::before {
  content: "";
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%) rotate(-4deg);
  width: 110px;
  height: 28px;
  background: rgba(226, 154, 46, 0.85);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
  z-index: 2;
}

.facts-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 2rem;
  justify-content: flex-start;
}
@media (max-width: 991.98px) {
  .facts-strip {
    justify-content: center;
  }
}
.facts-strip .fact {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-soft);
  background: var(--card);
  border: 1px solid var(--edge);
  border-radius: 999px;
  padding: 0.3rem 0.85rem;
}

/* ---------- Botones ---------- */
.btn {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  border-radius: 6px;
  padding: 0.65rem 1.4rem;
}
.btn-accent {
  background: var(--accent);
  border: 1px solid var(--accent-dark);
  color: var(--ink);
  font-weight: 700;
}
.btn-accent:hover {
  background: var(--accent-dark);
  color: var(--paper);
}
.btn-ink {
  background: transparent;
  border: 1px solid var(--ink);
  color: var(--ink);
}
.btn-ink:hover {
  background: var(--ink);
  color: var(--paper);
}
.btn-on-dark {
  border: 1px solid rgba(246, 238, 221, 0.6);
  color: var(--paper);
  background: transparent;
}
.btn-on-dark:hover {
  background: var(--paper);
  color: var(--ink);
}

/* ---------- Fichas de contenido (portfolio) ---------- */
.index-card {
  background: var(--card);
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: 1.6rem 1.4rem 1.4rem;
  height: 100%;
  position: relative;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
  overflow: hidden;
}
.index-card::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  border-width: 0 22px 22px 0;
  border-style: solid;
  border-color: var(--paper) var(--edge-soft) var(--paper) var(--paper);
  filter: drop-shadow(-1px 1px 1px rgba(27, 58, 75, 0.18));
}
.index-card:hover,
.index-card:focus-visible {
  transform: translateY(-4px);
  box-shadow: 0 4px 0 var(--accent-dark), 0 20px 30px -18px rgba(27, 58, 75, 0.4);
}
.index-card .card-block {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-teal);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 0.6rem;
}
.index-card .card-thumb {
  width: 100%;
  border-radius: 6px;
  margin-bottom: 1rem;
  border: 1px solid var(--edge);
  aspect-ratio: 4 / 3;
  object-fit: cover;
}
.index-card h3 {
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
}
.index-card .card-open {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-brick);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

/* ---------- Sinopsis: libro abierto ---------- */
.open-book {
  background: var(--ink);
  color: var(--paper);
  border-radius: 14px;
  padding: 3rem;
  position: relative;
}
.open-book::after {
  content: "";
  position: absolute;
  top: 2rem;
  bottom: 2rem;
  left: 50%;
  width: 1px;
  background: rgba(246, 238, 221, 0.25);
  display: block;
}
@media (max-width: 991.98px) {
  .open-book::after {
    display: none;
  }
  .open-book {
    padding: 2rem 1.4rem;
  }
}
.open-book p {
  color: rgba(246, 238, 221, 0.88);
}
.open-book .checklist {
  list-style: none;
  padding-left: 0;
  margin: 0;
}
.open-book .checklist li {
  position: relative;
  padding-left: 1.9rem;
  margin-bottom: 0.9rem;
  color: rgba(246, 238, 221, 0.92);
}
.open-book .checklist li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--accent);
  font-weight: 700;
  font-family: var(--font-mono);
}

/* ---------- Descargas: carpeta de archivos ---------- */
.accordion-folder .accordion-item {
  background: transparent;
  border: none;
  margin-bottom: 0.9rem;
}
.accordion-folder .accordion-button {
  background: var(--card);
  border: 1px solid var(--edge);
  border-radius: 8px !important;
  font-family: var(--font-mono);
  color: var(--ink);
  box-shadow: none;
  padding: 1.1rem 1.4rem;
}
.accordion-folder .accordion-button::after {
  filter: none;
}
.accordion-folder .accordion-button:not(.collapsed) {
  background: var(--ink);
  color: var(--paper);
  border-radius: 8px 8px 0 0 !important;
}
.accordion-folder .accordion-button:not(.collapsed)::after {
  filter: invert(1) grayscale(1) brightness(2);
}
.accordion-folder .accordion-button:focus {
  box-shadow: 0 0 0 3px rgba(182, 72, 42, 0.35);
}
.accordion-folder .accordion-body {
  background: var(--card);
  border: 1px solid var(--edge);
  border-top: none;
  border-radius: 0 0 8px 8px;
  padding: 1.4rem;
}
.tab-number {
  display: inline-block;
  background: var(--accent);
  color: var(--ink);
  font-size: 0.72rem;
  font-weight: 700;
  border-radius: 4px;
  padding: 0.1rem 0.5rem;
  margin-right: 0.6rem;
}

.file-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}
.file-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--paper);
  border: 1px solid var(--edge);
  border-radius: 999px;
  padding: 0.4rem 0.9rem 0.4rem 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-soft);
  text-decoration: none;
  transition: border-color 0.15s ease, color 0.15s ease;
}
.file-chip:hover {
  border-color: var(--accent-dark);
  color: var(--ink);
}
.file-chip .badge-type {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  font-size: 0.75rem;
  color: #fff;
  flex-shrink: 0;
}
.badge-type.sql { background: var(--accent-teal); }
.badge-type.pdf { background: var(--accent-brick); }
.badge-type.img { background: var(--accent-dark); }
.badge-type.zip { background: var(--ink); }

/* ---------- Compra: sellos/tickets ---------- */
.ticket {
  background: var(--card);
  border: 1px dashed var(--edge);
  border-radius: 10px;
  padding: 2.2rem 1.8rem;
  text-align: center;
  height: 100%;
}
.ticket i,
.ticket .ticket-icon {
  font-size: 1.8rem;
  color: var(--accent-brick);
  margin-bottom: 0.75rem;
  display: inline-block;
}

/* ---------- Modales ---------- */
.modal-content {
  background: var(--card);
  border-radius: 12px;
  border: 1px solid var(--edge);
}
.modal-title-mono {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-teal);
  display: block;
  margin-bottom: 0.4rem;
}
.portfolio-modal-title {
  color: var(--ink);
}
.portfolio-modal .btn-close {
  opacity: 0.6;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--ink);
  color: rgba(246, 238, 221, 0.85);
  padding: 3rem 0 2rem;
}
.site-footer h5 {
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.site-footer a {
  color: rgba(246, 238, 221, 0.85);
}
.site-footer a:hover {
  color: var(--accent);
}
.site-footer .copyright {
  border-top: 1px solid rgba(246, 238, 221, 0.15);
  margin-top: 2rem;
  padding-top: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-align: center;
  color: rgba(246, 238, 221, 0.6);
}