/*
 * style.css — Layout & Komponenten
 * --------------------------------
 * Verwendet ausschließlich Tokens aus variables.css (keine Literale, FR-012).
 * Mobile-first; Komponenten: Navigation, Footer, Buch-Karte, Button/CTA,
 * "demnächst"-Zustand, SVG-Wellen-Trenner, Hero-Papiertextur.
 */

@import url("variables.css");

/* ============================================================
   Schriften — lokal gehostet (research.md D3, kein Google-CDN)
   woff2-Dateien liegen in assets/fonts/. Fehlen sie, greift der
   Fallback-Stack aus den Tokens, die Seite bleibt voll lesbar.
   ============================================================ */
@font-face {
  font-family: "Lora";
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
  src: url("../assets/fonts/lora-variable.woff2") format("woff2");
}
@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
  src: url("../assets/fonts/inter-variable.woff2") format("woff2");
}

/* ============================================================
   Reset / Normalisierung (knapp)
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: var(--lh-base);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a {
  color: var(--color-primary);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}
a:hover { color: var(--color-primary-dark); }

h1, h2, h3 {
  font-family: var(--font-head);
  font-weight: var(--fw-bold);
  line-height: var(--lh-tight);
  color: var(--color-text);
  margin: 0 0 var(--space-4);
}
h1 { font-size: var(--fs-3xl); }
h2 { font-size: var(--fs-2xl); }
h3 { font-size: var(--fs-xl); }
p  { margin: 0 0 var(--space-4); }

ul { padding-left: var(--space-5); }

/* Sichtbarer Tastatur-Fokus (FR-020) */
:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Skip-Link */
.skip-link {
  position: absolute;
  left: var(--space-3);
  top: -3rem;
  background: var(--color-primary);
  color: var(--color-text-invert);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  z-index: 100;
  transition: top 0.15s ease;
}
.skip-link:focus { top: var(--space-3); color: var(--color-text-invert); }

/* ============================================================
   Layout-Container
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--maxw-content);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

main { flex: 1 0 auto; }

.section { padding-block: var(--space-7); }
.section--alt { background: var(--color-surface-alt); }

.prose { max-width: var(--maxw-prose); }
.prose p { color: var(--color-text); }

.lead { font-size: var(--fs-lg); color: var(--color-text-muted); }

.text-center { text-align: center; }

/* ============================================================
   Buttons / CTA
   ============================================================ */
.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-weight: var(--fw-bold);
  font-size: var(--fs-base);
  line-height: 1.2;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.btn--primary {
  background: var(--color-primary);
  color: var(--color-text-invert);
}
.btn--primary:hover { background: var(--color-primary-dark); color: var(--color-text-invert); }

.btn--accent {
  background: var(--color-accent);
  color: var(--color-text-invert);
}
.btn--accent:hover { background: var(--color-accent-dark); color: var(--color-text-invert); }

.btn--ghost {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn--ghost:hover { background: var(--color-primary-soft); }

/* "demnächst"-Zustand (research.md D4, FR-004): kein Link, sichtbar inaktiv */
.btn--soon {
  display: inline-block;
  font-weight: var(--fw-bold);
  font-size: var(--fs-sm);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius);
  background: var(--color-surface-alt);
  color: var(--color-text-muted);
  border: 2px dashed var(--color-border);
  cursor: default;
}

/* ============================================================
   Header / Navigation
   ============================================================ */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 50;
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-block: var(--space-3);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-primary);
  font-family: var(--font-head);
  font-weight: var(--fw-bold);
  font-size: var(--fs-lg);
}
.brand img { height: 2.5rem; width: auto; }

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: transparent;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-3);
  font: inherit;
  color: var(--color-text);
  cursor: pointer;
}
.nav-toggle__bars { display: inline-block; width: 1.1rem; height: 2px; background: currentColor; position: relative; }
.nav-toggle__bars::before,
.nav-toggle__bars::after { content: ""; position: absolute; left: 0; width: 100%; height: 2px; background: currentColor; }
.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-5);
  align-items: center;
}
.site-nav a {
  text-decoration: none;
  color: var(--color-text);
  font-weight: var(--fw-medium);
  padding-block: var(--space-1);
}
.site-nav a:hover { color: var(--color-primary); }
.site-nav a[aria-current="page"] {
  color: var(--color-primary);
  border-bottom: 2px solid var(--color-accent);
}
/* "demnächst"-Nav-Platzhalter (FR-009): kein aktiver Link */
.site-nav .nav-soon {
  color: var(--color-text-muted);
  font-weight: var(--fw-medium);
  cursor: default;
}
.site-nav .nav-soon small {
  display: inline-block;
  font-size: 0.7rem;
  background: var(--color-surface-alt);
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  padding: 0 var(--space-2);
  margin-left: var(--space-1);
}

/* Mobile-first: Navigation einklappbar, aber ohne JS sichtbar (FR-022) */
@media (max-width: 47.9375em) {
  /* flex-wrap: wrap erlaubt dem Nav, in eine eigene Zeile unter Brand+Toggle zu brechen */
  .site-header__inner { flex-wrap: wrap; }

  .nav-toggle { display: inline-flex; }

  /* Standard (ohne JS) & aufgeklappter Zustand: Nav nimmt volle Breite, bricht in neue Zeile */
  .site-nav {
    flex-basis: 100%;
    width: 100%;
    border-top: 1px solid var(--color-border);
    padding-block: var(--space-2) var(--space-4);
  }
  .site-nav ul { flex-direction: column; align-items: flex-start; gap: var(--space-3); padding-top: 0; }

  /* Mit JS: Navigation standardmäßig geschlossen, per Button öffnen */
  .js .site-nav[hidden] { display: none; }
  .js .site-nav { display: block; }
}
@media (min-width: 48em) {
  .nav-toggle { display: none; }
  .site-nav { display: block !important; }
}

/* ============================================================
   Hero (mit Papiertextur — research.md D5)
   ============================================================ */
.hero {
  background-color: var(--color-primary-soft);
  /* Papiertextur als inline-SVG-Rauschen (kein Binär-Asset, build-frei) */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.05'/%3E%3C/svg%3E");
  background-repeat: repeat;
  padding-block: var(--space-8);
}
.hero__inner {
  display: grid;
  gap: var(--space-6);
  align-items: center;
}
.hero__title { font-size: var(--fs-hero); margin-bottom: var(--space-3); }
.hero__tagline {
  font-family: var(--font-head);
  font-size: var(--fs-xl);
  color: var(--color-accent-dark);
  margin-bottom: var(--space-4);
}
.hero__intro { font-size: var(--fs-lg); color: var(--color-text-muted); max-width: var(--maxw-prose); }
.hero__actions { margin-top: var(--space-5); display: flex; flex-wrap: wrap; gap: var(--space-3); }

@media (min-width: 48em) {
  .hero__inner { grid-template-columns: 1.2fr 0.8fr; }
}

/* ============================================================
   SVG-Wellen-Trenner (research.md D5)
   ============================================================ */
.wave {
  display: block;
  width: 100%;
  height: 48px;
  color: var(--color-surface-alt);
}
.wave svg { display: block; width: 100%; height: 100%; }

/* ============================================================
   Buch-Karten
   ============================================================ */
.book-grid {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: 1fr;
  list-style: none;
  margin: 0;
  padding: 0;
}
@media (min-width: 36em)  { .book-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 60em)  { .book-grid { grid-template-columns: repeat(3, 1fr); } }

.book-card {
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  height: 100%;
}
.book-card__cover {
  /* Cover werden im echten Seitenverhältnis ohne Beschnitt gezeigt
     (Formate variieren: 7x10" hochkant bis 8,5x8,5" quadratisch).
     Das korrekte Verhältnis kommt aus den width/height-Attributen je <img>. */
  width: 100%;
  height: auto;
  background: var(--color-surface-alt);
}
.book-card__body {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-5);
  flex: 1 0 auto;
}
.book-card__title { font-size: var(--fs-lg); margin: 0; }
.book-card__meta {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.book-card__teaser { margin: 0; color: var(--color-text); }
.book-card__actions { margin-top: auto; padding-top: var(--space-3); }

/* Featured-Buch (Startseite, D6) */
.book-featured {
  display: grid;
  gap: var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-6);
}
.book-featured img { border-radius: var(--radius); width: 100%; height: auto; }
@media (min-width: 40em) { .book-featured { grid-template-columns: 0.6fr 1fr; align-items: center; } }

/* ============================================================
   Partner-Liste & generische Listen
   ============================================================ */
.partner-list { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-4); }
.partner-list li {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-4) var(--space-5);
}
.partner-list a { font-weight: var(--fw-bold); }
.partner-list p { margin: var(--space-1) 0 0; color: var(--color-text-muted); }

/* Freundlicher Leerzustand (FR-025) */
.empty-hint {
  background: var(--color-primary-soft);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-5);
  color: var(--color-text-muted);
  text-align: center;
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  background: var(--color-primary);
  color: var(--color-text-invert);
  padding-block: var(--space-7);
  margin-top: var(--space-8);
}
.site-footer a { color: var(--color-text-invert); text-decoration: underline; }
.site-footer__inner {
  display: grid;
  gap: var(--space-5);
}
@media (min-width: 48em) {
  .site-footer__inner { grid-template-columns: 1.5fr 1fr 1fr; }
}
.site-footer h2 { color: var(--color-text-invert); font-size: var(--fs-lg); }
.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-2); }
.site-footer__legal {
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: 1px solid rgba(255, 253, 248, 0.2);
  font-size: var(--fs-sm);
  color: rgba(255, 253, 248, 0.8);
}

/* ============================================================
   Hilfsklassen
   ============================================================ */
.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0; border: 0;
  clip: rect(0 0 0 0); clip-path: inset(50%);
  overflow: hidden; white-space: nowrap;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}