/* ==========================================================================
   Herbert H. T. Osenger - Design System & Stylesheet
   ========================================================================== */

:root {
  --color-primary: #000000;
  --color-secondary: #1D1D1B;
  --color-text-silver: #B4B0B2;
  --color-accent-white: #FFFFFF;
  --color-border: #1D1D1B;
  --color-bg-dark: #141413;
  --color-bg-darker: #0d0d0c;
  --color-card-bg: #FFFFFF;
  
  --font-title: 'Piedra', serif, cursive;
  --font-heading: 'Cormorant Garamond', Georgia, serif;
  --font-body: 'Montserrat', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  --container-max-width: 1280px;
  --header-height: 76px;
  --header-mobile-height: 64px;
  --transition-fast: 0.25s cubic-bezier(0.25, 0.8, 0.25, 1);
  --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--color-secondary);
  color: var(--color-secondary);
}

body {
  font-family: var(--font-body);
  font-size: 1.125rem;
  line-height: 1.65;
  color: var(--color-secondary);
  background-color: var(--color-accent-white);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

body.nav-open {
  overflow: hidden;
}

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

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

/* ==========================================================================
   Header & Navigation
   ========================================================================== */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: rgba(29, 29, 27, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(180, 176, 178, 0.2);
  transition: background-color var(--transition-fast), box-shadow var(--transition-fast);
}

.site-header.inner-header {
  background-color: var(--color-secondary);
  border-bottom: 1px solid rgba(180, 176, 178, 0.25);
}

.site-header.scrolled {
  background-color: rgba(29, 29, 27, 0.98);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.6);
}

.header-container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: var(--header-height);
}

.site-branding {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.site-title {
  font-family: var(--font-title);
  font-size: 2.35rem;
  line-height: 1.1;
  color: var(--color-text-silver);
  letter-spacing: 1px;
  margin-bottom: -2px;
}

.site-title a {
  color: var(--color-text-silver);
}

.site-title a:hover {
  color: var(--color-accent-white);
}

.site-subtitle {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-accent-white);
  margin: 0;
}

.site-navigation {
  display: flex;
  align-items: center;
}

.nav-menu {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-item {
  position: relative;
}

.nav-link {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--color-text-silver);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem 0;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-accent-white);
}

.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 260px;
  background-color: var(--color-secondary);
  border: 1px solid rgba(180, 176, 178, 0.25);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.6);
  list-style: none;
  padding: 0.5rem 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
  z-index: 110;
}

.nav-item:hover .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item a {
  display: block;
  padding: 0.65rem 1.25rem;
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-silver);
}

.dropdown-item a:hover {
  background-color: var(--color-accent-white);
  color: var(--color-primary);
}

/* Hamburger Icon */
.mobile-nav-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  width: 44px;
  height: 44px;
  position: relative;
  z-index: 1001;
  align-items: center;
  justify-content: center;
}

.hamburger-box {
  width: 26px;
  height: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
}

.hamburger-line {
  display: block;
  width: 100%;
  height: 2.5px;
  background-color: var(--color-text-silver);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast), background-color var(--transition-fast);
}

.mobile-nav-toggle:hover .hamburger-line {
  background-color: var(--color-accent-white);
}

.mobile-nav-toggle.active .hamburger-line:nth-child(1) {
  transform: translateY(8.5px) rotate(45deg);
  background-color: var(--color-accent-white);
}

.mobile-nav-toggle.active .hamburger-line:nth-child(2) {
  opacity: 0;
}

.mobile-nav-toggle.active .hamburger-line:nth-child(3) {
  transform: translateY(-8.5px) rotate(-45deg);
  background-color: var(--color-accent-white);
}

/* ==========================================================================
   Hero Section (Home)
   ========================================================================== */

.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 1.5rem 60px;
  overflow: hidden;
  background-color: var(--color-primary);
}

.hero-slideshow-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

.hero-slide {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center center;
  opacity: 0;
  transform: scale(1.05);
  transition: opacity 1.5s ease-in-out, transform 6s ease-out;
}

.hero-slide.active {
  opacity: 1;
  transform: scale(1);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, rgba(0, 0, 0, 0.4) 0%, rgba(0, 0, 0, 0.75) 100%);
  z-index: 2;
}

.hero-content {
  position: relative;
  z-index: 3;
  max-width: 1100px;
  margin: 0 auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2.5rem;
}

.hero-title {
  font-family: var(--font-title);
  font-size: 5rem;
  font-weight: 400;
  line-height: 1.15;
  color: var(--color-text-silver);
  letter-spacing: 5px;
  text-shadow: 8px 8px 10px #030303;
  max-width: 1000px;
}

.hero-logo {
  max-height: 42vh;
  width: auto;
  filter: drop-shadow(0 15px 25px rgba(0, 0, 0, 0.8));
  transition: transform var(--transition-smooth);
}

.hero-logo:hover {
  transform: translateY(-5px);
}

/* ==========================================================================
   Subpage Hero Banner
   ========================================================================== */

.subpage-hero {
  position: relative;
  min-height: 52vh;
  background-color: var(--color-primary);
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 1.5rem 60px;
  overflow: hidden;
}

.subpage-hero-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, rgba(0, 0, 0, 0.45) 0%, rgba(0, 0, 0, 0.78) 100%);
  z-index: 1;
}

.subpage-hero-content {
  position: relative;
  z-index: 3;
  max-width: 1000px;
  margin: 0 auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
}

.subpage-hero-title {
  font-family: var(--font-title);
  font-size: 3.5rem;
  font-weight: 400;
  line-height: 1.2;
  color: var(--color-text-silver);
  letter-spacing: 3px;
  text-shadow: 6px 6px 8px #030303;
}

.subpage-hero-logo {
  max-height: 220px;
  width: auto;
  filter: drop-shadow(0 10px 20px rgba(0, 0, 0, 0.7));
}

/* ==========================================================================
   Subpage Content Wrapper
   ========================================================================== */

.subpage-content-wrapper {
  background-color: var(--color-accent-white);
  padding: 80px 1.5rem 100px;
  min-height: 50vh;
}

.subpage-container {
  max-width: var(--container-max-width);
  margin: 0 auto;
}

.page-intro-heading {
  font-family: var(--font-heading);
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--color-secondary);
  margin-bottom: 2.5rem;
  line-height: 1.25;
}

.content-two-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
  align-items: flex-start;
  margin-bottom: 3.5rem;
}

.content-prose {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  font-family: var(--font-body);
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-secondary);
}

.content-prose p {
  letter-spacing: 0.5px;
}

.content-prose h2, .content-prose h3 {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--color-secondary);
  margin-top: 1.5rem;
}

.content-prose blockquote {
  border-left: 3px solid var(--color-secondary);
  padding: 0.75rem 0 0.75rem 1.5rem;
  font-style: italic;
  font-size: 1.15rem;
}

/* Author Page */
.author-life-grid {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 3.5rem;
  align-items: flex-start;
  margin-bottom: 4rem;
}

.author-media-box {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.author-photo-card {
  width: 100%;
  border-radius: 2px;
  box-shadow: 5px 5px 15px rgba(0, 0, 0, 0.45);
}

.timeline-box {
  background-color: #f9f9f9;
  border-left: 3px solid var(--color-secondary);
  padding: 1.5rem;
  font-size: 1rem;
}

/* Quote Cards Grid */
.quotes-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  margin-top: 2rem;
}

.quote-card {
  background-color: #fafafa;
  border-left: 4px solid var(--color-secondary);
  padding: 2rem 2rem 2rem 2.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.quote-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.quote-text {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-style: italic;
  line-height: 1.5;
  color: var(--color-secondary);
}

.quote-author {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #666666;
}

/* ==========================================================================
   Books List Styles (for Adult & Youth Books pages)
   ========================================================================== */

.books-list-wrapper {
  display: flex;
  flex-direction: column;
  gap: 5rem;
  margin-top: 2rem;
}

.book-item-row {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 3.5rem;
  align-items: flex-start;
  padding-bottom: 4rem;
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.book-item-row:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.book-cover-col {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.book-cover-col img {
  width: 100%;
  border-radius: 2px;
  box-shadow: 5px 5px 15px rgba(0, 0, 0, 0.45);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.book-cover-col img:hover {
  transform: translateY(-5px);
  box-shadow: 8px 14px 25px rgba(0, 0, 0, 0.55);
}

.book-store-buttons {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-top: 0.5rem;
}

.btn-store {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.55rem 1rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background-color: var(--color-accent-white);
  color: var(--color-secondary);
  border: 1px solid var(--color-secondary);
  box-shadow: 2px 2px 6px rgba(0, 0, 0, 0.25);
  transition: all var(--transition-fast);
  text-align: center;
}

.btn-store:hover {
  background-color: var(--color-secondary);
  color: var(--color-accent-white);
  transform: translateY(-2px);
  box-shadow: 4px 6px 12px rgba(0, 0, 0, 0.35);
}

.book-info-col {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.book-title-heading {
  font-family: var(--font-heading);
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--color-secondary);
  line-height: 1.2;
}

.book-publisher-note {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-style: italic;
  color: #555555;
}

.book-body-text {
  font-family: var(--font-body);
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-secondary);
}

.book-body-text p {
  margin-bottom: 1rem;
}

/* ==========================================================================
   News / Neuigkeiten Page
   ========================================================================== */

.news-archive-grid {
  display: flex;
  flex-direction: column;
  gap: 3.5rem;
}

.news-card {
  background-color: #fafafa;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-left: 4px solid var(--color-secondary);
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.04);
}

.news-card-date {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #777777;
}

.news-card-title {
  font-family: var(--font-heading);
  font-size: 1.85rem;
  font-weight: 700;
  color: var(--color-secondary);
  line-height: 1.25;
}

.news-card-content {
  font-family: var(--font-body);
  font-size: 1.1rem;
  line-height: 1.65;
  color: var(--color-secondary);
}

.news-card-image {
  max-width: 550px;
  margin-top: 1rem;
  border-radius: 2px;
  box-shadow: 3px 3px 12px rgba(0, 0, 0, 0.25);
}

/* ==========================================================================
   Legal Pages (Impressum / DSE / Social)
   ========================================================================== */

.legal-content {
  max-width: 900px;
  margin: 0 auto;
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--color-secondary);
}

.legal-content h1 {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  margin-bottom: 2rem;
}

.legal-content h2 {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
  padding-bottom: 0.5rem;
}

.legal-content h3 {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
}

.legal-content h4 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  margin-top: 1.25rem;
  margin-bottom: 0.5rem;
}

.legal-content p {
  margin-bottom: 1.25rem;
}

.legal-content ul {
  margin: 1rem 0 1.5rem 2rem;
}

.legal-content li {
  margin-bottom: 0.5rem;
}

/* ==========================================================================
   Author Section (Home)
   ========================================================================== */

.author-section {
  background-color: var(--color-accent-white);
  padding: 100px 1.5rem 80px;
}

.author-container {
  max-width: var(--container-max-width);
  margin: 0 auto;
}

.author-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
  align-items: center;
  margin-bottom: 5rem;
}

.author-portrait-wrapper {
  position: relative;
}

.author-portrait {
  width: 100%;
  border-radius: 2px;
  box-shadow: 5px 5px 15px rgba(0, 0, 0, 0.45);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.author-portrait:hover {
  transform: translateY(-6px);
  box-shadow: 8px 12px 25px rgba(0, 0, 0, 0.5);
}

.author-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1.5rem;
}

.section-heading {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-secondary);
  line-height: 1.2;
}

.author-text {
  font-family: var(--font-body);
  font-size: 1.125rem;
  font-weight: 500;
  line-height: 1.65;
  letter-spacing: 1.3px;
  color: var(--color-secondary);
}

.btn-primary {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--color-secondary);
  background-color: var(--color-accent-white);
  border: 1px solid var(--color-secondary);
  padding: 0.75rem 1.75rem;
  box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.4);
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast), color var(--transition-fast);
}

.btn-primary:hover {
  background-color: var(--color-secondary);
  color: var(--color-accent-white);
  transform: translateY(-4px);
  box-shadow: 7px 9px 18px rgba(0, 0, 0, 0.5);
}

/* 4 Genre Icons */
.genre-icons-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  justify-items: center;
  align-items: center;
  padding: 2rem 0;
  border-top: 1px solid rgba(0, 0, 0, 0.08);
}

.genre-icon-item {
  display: flex;
  justify-content: center;
  align-items: center;
}

.genre-icon-item img {
  max-width: 140px;
  height: auto;
  filter: contrast(0.9) brightness(1.05);
  transition: transform var(--transition-fast);
}

.genre-icon-item:hover img {
  transform: scale(1.08) translateY(-4px);
}

/* ==========================================================================
   Books Showcase Section (Home)
   ========================================================================== */

.books-section {
  background-color: var(--color-accent-white);
  padding: 40px 1.5rem 100px;
}

.books-container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 4.5rem;
}

.book-card {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 3.5rem;
  align-items: center;
  padding: 1.5rem 0;
}

.book-cover-wrapper {
  position: relative;
  display: flex;
  justify-content: center;
}

.book-cover {
  width: 260px;
  max-width: 100%;
  border-radius: 2px;
  box-shadow: 5px 5px 15px rgba(0, 0, 0, 0.45);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.book-cover:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: 8px 14px 25px rgba(0, 0, 0, 0.55);
}

.book-details {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1.25rem;
}

.book-title {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-secondary);
  line-height: 1.2;
}

.book-divider {
  width: 90px;
  height: 2px;
  background-color: var(--color-secondary);
  border: none;
}

.book-description {
  font-family: var(--font-body);
  font-size: 1.125rem;
  font-weight: 500;
  line-height: 1.65;
  letter-spacing: 1.3px;
  color: var(--color-secondary);
}

/* ==========================================================================
   Footer & Contact Section
   ========================================================================== */

.site-footer {
  background-color: var(--color-secondary);
  color: var(--color-text-silver);
  border-top: 1px solid var(--color-primary);
  padding: 80px 1.5rem 0;
  position: relative;
}

.footer-container {
  max-width: var(--container-max-width);
  margin: 0 auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 5rem;
  padding-bottom: 70px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.footer-title {
  font-family: var(--font-title);
  font-size: 2.5rem;
  color: var(--color-text-silver);
  line-height: 1.1;
  margin-bottom: -6px;
}

.footer-subtitle {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.2px;
  color: var(--color-accent-white);
}

.footer-intro-text {
  font-family: var(--font-body);
  font-size: 1.125rem;
  font-weight: 400;
  line-height: 1.65;
  color: var(--color-text-silver);
  margin-top: 1.5rem;
}

.social-links {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

.social-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background-color: var(--color-accent-white);
  color: var(--color-secondary);
  border: 1px solid var(--color-secondary);
  font-size: 1.25rem;
  transition: transform var(--transition-fast), background-color var(--transition-fast), color var(--transition-fast);
}

.social-btn:hover {
  transform: translateY(-3px);
  background-color: var(--color-primary);
  color: var(--color-accent-white);
}

/* Contact Info Card */
.contact-card-wrapper {
  display: flex;
  flex-direction: column;
}

.contact-info-card {
  background-color: #242422;
  border: 1px solid rgba(180, 176, 178, 0.2);
  border-left: 3px solid var(--color-text-silver);
  padding: 2.25rem 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
}

.contact-card-title {
  font-family: var(--font-heading);
  font-size: 1.85rem;
  font-weight: 700;
  color: var(--color-accent-white);
  line-height: 1.2;
}

.contact-details-list {
  display: flex;
  flex-direction: column;
  gap: 1.35rem;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 1.2rem;
}

.contact-icon {
  color: var(--color-text-silver);
  flex-shrink: 0;
  margin-top: 0.25rem;
}

.contact-text {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.contact-label {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: #8e8e8b;
}

.contact-value {
  color: var(--color-accent-white);
  font-size: 1.05rem;
  font-weight: 500;
  line-height: 1.5;
}

.contact-value a {
  color: var(--color-accent-white);
  transition: color var(--transition-fast);
}

.contact-value a:hover {
  color: var(--color-text-silver);
  text-decoration: underline;
}

.btn-contact-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  align-self: flex-start;
  margin-top: 0.5rem;
  padding: 0.75rem 1.85rem;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background-color: var(--color-accent-white);
  color: var(--color-primary);
  border: 1px solid var(--color-accent-white);
  transition: background-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.btn-contact-action:hover {
  background-color: transparent;
  color: var(--color-accent-white);
  transform: translateY(-2px);
}

/* Footer Bottom Bar */
.footer-bottom {
  border-top: 1px solid rgba(180, 176, 178, 0.2);
  padding: 1.5rem 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.95rem;
  color: var(--color-text-silver);
}

.footer-nav {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.footer-nav-link {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--color-text-silver);
}

.footer-nav-link:hover {
  color: var(--color-accent-white);
}

/* ==========================================================================
   Responsive Breakpoints & Mobile Header Optimization
   ========================================================================== */

@media (max-width: 1024px) {
  .hero-title {
    font-size: 3.5rem;
  }
  .subpage-hero-title {
    font-size: 2.75rem;
  }
  .author-grid, .content-two-cols, .author-life-grid {
    gap: 2.5rem;
  }
  .book-card, .book-item-row {
    gap: 2.5rem;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 3.5rem;
  }
}

@media (max-width: 768px) {
  .site-header {
    background-color: var(--color-secondary);
  }

  .header-container {
    padding: 0.5rem 1.25rem;
    min-height: var(--header-mobile-height);
  }

  .site-title {
    font-size: 1.7rem;
  }

  .site-subtitle {
    font-size: 0.85rem;
    letter-spacing: 0.3px;
  }

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

  /* Mobile Navigation Drawer */
  .site-navigation {
    position: fixed;
    top: var(--header-mobile-height);
    left: 0;
    width: 100%;
    height: calc(100vh - var(--header-mobile-height));
    background-color: #171716;
    border-top: 1px solid rgba(180, 176, 178, 0.15);
    padding: 1.25rem 1.5rem 3rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
    z-index: 999;
  }

  .site-navigation.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav-menu {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
    width: 100%;
  }

  .nav-item {
    width: 100%;
    border-bottom: 1px solid rgba(180, 176, 178, 0.12);
    padding-bottom: 0.6rem;
  }

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

  .nav-link {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--color-accent-white);
    padding: 0.5rem 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
  }

  .nav-dropdown {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    background-color: rgba(0, 0, 0, 0.3);
    border: none;
    border-left: 2px solid var(--color-text-silver);
    box-shadow: none;
    padding: 0.4rem 0 0.4rem 1rem;
    margin-top: 0.4rem;
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
  }

  .dropdown-item a {
    font-size: 1.1rem;
    font-weight: 500;
    padding: 0.5rem 0.75rem;
    color: var(--color-text-silver);
    border-radius: 2px;
  }

  .dropdown-item a:hover,
  .dropdown-item a:active {
    background-color: rgba(255, 255, 255, 0.08);
    color: var(--color-accent-white);
  }

  /* Page Elements adjustments on mobile */
  .hero-section {
    padding-top: 100px;
  }

  .hero-title {
    font-size: 2.3rem;
    letter-spacing: 2px;
  }

  .subpage-hero {
    padding-top: 100px;
    min-height: 40vh;
  }

  .subpage-hero-title {
    font-size: 2.1rem;
    letter-spacing: 1px;
  }

  .subpage-hero-logo {
    max-height: 160px;
  }

  .subpage-content-wrapper {
    padding: 50px 1.25rem 70px;
  }

  .author-grid, .content-two-cols, .author-life-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .author-content {
    align-items: flex-start;
  }

  .quotes-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .quote-card {
    padding: 1.5rem;
  }

  .genre-icons-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }

  .book-card, .book-item-row {
    grid-template-columns: 1fr;
    text-align: left;
    justify-items: center;
    gap: 2rem;
  }

  .book-cover-col {
    max-width: 260px;
  }

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

  .footer-grid {
    gap: 3rem;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  .footer-nav {
    flex-wrap: wrap;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .site-title {
    font-size: 1.45rem;
  }
  .site-subtitle {
    font-size: 0.78rem;
  }
  .hero-title {
    font-size: 1.85rem;
    letter-spacing: 1px;
  }
  .subpage-hero-title {
    font-size: 1.75rem;
  }
  .section-heading, .book-title, .page-intro-heading {
    font-size: 1.65rem;
  }
}