/* ==========================================================================
   HAMZA IQBAL — AUTHOR OF "BELIEVE IN YOURSELF"
   Art Direction: Mindful Calm, Morning Light, Restorative Clarity
   Typography: Fraunces (Warm Editorial Serif) + Plus Jakarta Sans (Humanist Sans)
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS Custom Properties / Design Tokens
   -------------------------------------------------------------------------- */
:root {
  /* Color Palette: Calming Morning Mist & Radiant Accents */
  --bg-page: #F8FAFC;
  --bg-surface: #FFFFFF;
  --bg-surface-subtle: #F1F5F9;
  --bg-surface-muted: #E2E8F0;
  --bg-banner: #0F172A;

  /* Typography Colors (AAA / AA Compliant) */
  --text-main: #0F172A;
  --text-muted: #334155;
  --text-faint: #64748B;
  --text-light: #94A3B8;
  --text-inverse: #FFFFFF;

  /* Accent & Brand Colors (Drawn directly from cover) */
  --primary: #0D9488;
  --primary-hover: #0F766E;
  --primary-light: #CCFBF1;
  --primary-dark: #115E59;

  --amber: #D97706;
  --amber-light: #FEF3C7;
  --amber-dark: #B45309;

  --rose: #E11D48;
  --rose-light: #FFE4E6;

  --indigo: #4F46E5;
  --indigo-light: #E0E7FF;

  --border-subtle: #E2E8F0;
  --border-focus: #0D9488;

  /* Typography Families */
  --font-serif: "Fraunces", Georgia, Cambria, "Times New Roman", Times, serif;
  --font-sans: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  /* Layout & Sizing */
  --container-max: 1200px;
  --container-padding: clamp(1rem, 4vw, 2rem);
  --header-height: 72px;
  --border-radius-sm: 8px;
  --border-radius-md: 14px;
  --border-radius-lg: 20px;
  --border-radius-xl: 28px;
  --border-radius-pill: 9999px;

  /* Elevation Shadows */
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.05), 0 1px 2px rgba(15, 23, 42, 0.03);
  --shadow-md: 0 4px 12px -1px rgba(15, 23, 42, 0.08), 0 2px 6px -1px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 12px 30px -4px rgba(15, 23, 42, 0.12), 0 4px 12px -2px rgba(15, 23, 42, 0.06);
  --shadow-book: 0 20px 40px -10px rgba(15, 23, 42, 0.22), 0 8px 16px -4px rgba(15, 23, 42, 0.12);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 400ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* --------------------------------------------------------------------------
   2. Reset & Base Styles
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--text-main);
  background-color: var(--bg-page);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul, ol {
  list-style: none;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: transparent;
}

/* --------------------------------------------------------------------------
   3. Focus & Accessibility
   -------------------------------------------------------------------------- */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--primary);
  color: var(--text-inverse);
  padding: 0.75rem 1.25rem;
  font-weight: 600;
  border-radius: var(--border-radius-sm);
  z-index: 9999;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 1rem;
  outline: 3px solid var(--amber);
  outline-offset: 2px;
}

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

/* --------------------------------------------------------------------------
   4. Layout Utilities
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

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

/* Section Header Structure */
.section {
  padding: clamp(3.5rem, 8vw, 6rem) 0;
  position: relative;
}

.section-header {
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.section-kicker {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--primary);
  margin-bottom: 0.75rem;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.875rem, 4vw, 2.75rem);
  font-weight: 600;
  line-height: 1.2;
  color: var(--text-main);
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: clamp(1rem, 1.8vw, 1.125rem);
  color: var(--text-muted);
  line-height: 1.65;
}

/* --------------------------------------------------------------------------
   5. Buttons & Badges
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.9375rem;
  padding: 0.8rem 1.625rem;
  min-height: 46px;
  border-radius: var(--border-radius-pill);
  transition: all var(--transition-base);
  text-align: center;
  white-space: nowrap;
  line-height: 1;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.btn:active {
  transform: translateY(1px) scale(0.98);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  min-height: 38px;
}

.btn-md {
  padding: 0.8rem 1.625rem;
  font-size: 0.9375rem;
  min-height: 46px;
}

.btn-lg {
  padding: 0.95rem 2rem;
  font-size: 1rem;
  min-height: 52px;
}

.btn-block {
  display: flex;
  width: 100%;
}

.btn-primary {
  background-color: var(--primary);
  color: var(--text-inverse);
  box-shadow: 0 4px 14px rgba(13, 148, 136, 0.3);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  box-shadow: 0 6px 20px rgba(13, 148, 136, 0.4);
  transform: translateY(-2px);
}

.btn-secondary {
  background-color: var(--bg-surface);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background-color: var(--bg-surface-subtle);
  border-color: #CBD5E1;
  transform: translateY(-2px);
}

.btn-outline {
  background-color: var(--bg-surface);
  color: var(--primary);
  border: 1.5px solid var(--primary);
  box-shadow: var(--shadow-sm);
}

.btn-outline:hover {
  background-color: var(--primary);
  color: var(--text-inverse);
  border-color: var(--primary);
  box-shadow: 0 6px 18px rgba(13, 148, 136, 0.25);
  transform: translateY(-2px);
}

.btn-icon {
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.btn:hover .btn-icon {
  transform: translateX(2px);
}

/* --------------------------------------------------------------------------
   6. Top Ribbon / Announcement
   -------------------------------------------------------------------------- */
.top-banner {
  background-color: var(--bg-banner);
  color: var(--text-inverse);
  padding: 0.5rem 0;
  font-size: 0.8125rem;
  position: relative;
  z-index: 50;
}

.banner-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.625rem;
  text-align: center;
}

.banner-badge {
  background: linear-gradient(135deg, var(--amber), #F59E0B);
  color: #0F172A;
  font-weight: 700;
  text-transform: uppercase;
  font-size: 0.6875rem;
  letter-spacing: 0.05em;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
}

.banner-text {
  color: #E2E8F0;
}

.banner-text em {
  font-style: normal;
  font-weight: 600;
  color: #FFFFFF;
}

.banner-link {
  color: #5EEAD4;
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.banner-link:hover {
  color: #FFFFFF;
}

/* --------------------------------------------------------------------------
   7. Site Header & Navigation
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(248, 250, 252, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  height: var(--header-height);
  transition: background-color var(--transition-fast), box-shadow var(--transition-fast);
}

.site-header.is-scrolled {
  background-color: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-sm);
}

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

.brand-link {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.brand-tag {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--primary);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-muted);
  position: relative;
  padding: 0.25rem 0;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary);
  transition: width var(--transition-base);
}

.nav-link:hover {
  color: var(--primary);
}

.nav-link:hover::after {
  width: 100%;
}

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

.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border-radius: var(--border-radius-sm);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mobile-toggle:hover {
  background-color: var(--bg-surface-subtle);
  border-color: #CBD5E1;
}

.mobile-toggle:active {
  transform: scale(0.95);
}

.hamburger-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: currentColor;
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* Mobile Drawer */
.mobile-drawer {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: none;
}

.mobile-drawer.is-open {
  display: block;
}

.drawer-backdrop {
  position: absolute;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.5);
  opacity: 0;
  transition: opacity var(--transition-smooth);
  backdrop-filter: blur(4px);
}

.mobile-drawer.is-open .drawer-backdrop {
  opacity: 1;
}

.drawer-content {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(320px, 85vw);
  background-color: var(--bg-surface);
  box-shadow: -8px 0 24px rgba(15, 23, 42, 0.15);
  transform: translateX(100%);
  transition: transform var(--transition-smooth);
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
}

.mobile-drawer.is-open .drawer-content {
  transform: translateX(0);
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-subtle);
}

.drawer-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-main);
}

.drawer-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  font-size: 1.75rem;
  line-height: 1;
  color: var(--text-muted);
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  transition: all var(--transition-fast);
}

.drawer-close:hover {
  background-color: var(--bg-surface-subtle);
  color: var(--text-main);
}

.drawer-close:active {
  transform: scale(0.92);
}

.drawer-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 1.5rem;
  flex-grow: 1;
}

.drawer-link {
  display: block;
  padding: 0.875rem 0.75rem;
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text-main);
  border-radius: var(--border-radius-sm);
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.drawer-link:hover {
  background-color: var(--bg-surface-subtle);
  color: var(--primary);
}

.drawer-footer {
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-subtle);
}

.drawer-disclosure {
  font-size: 0.6875rem;
  color: var(--text-faint);
  text-align: center;
  margin-top: 0.75rem;
  line-height: 1.4;
}

/* --------------------------------------------------------------------------
   8. Hero Section
   -------------------------------------------------------------------------- */
.hero-section {
  position: relative;
  overflow: hidden;
  padding: clamp(2.5rem, 6vw, 4.5rem) 0 clamp(3.5rem, 8vw, 5.5rem);
  background: linear-gradient(180deg, #F8FAFC 0%, #EFF6FF 50%, #F8FAFC 100%);
}

.hero-ambient {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  max-width: 100%;
}

.ambient-circle {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.5;
  pointer-events: none;
}

.ambient-1 {
  width: min(450px, 80vw);
  height: min(450px, 80vw);
  background: #BAE6FD;
  top: -100px;
  right: 0;
}

.ambient-2 {
  width: min(350px, 70vw);
  height: min(350px, 70vw);
  background: #FED7AA;
  bottom: 10%;
  left: 0;
}

.ambient-3 {
  width: min(200px, 40vw);
  height: min(200px, 40vw);
  background: #FBCFE8;
  top: 30%;
  left: 20%;
  opacity: 0.25;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(2.5rem, 5vw, 4.5rem);
  align-items: center;
  position: relative;
  z-index: 2;
}

.eyebrow-wrapper {
  margin-bottom: 1rem;
}

.eyebrow-pill {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.875rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #0369A1;
  background-color: #E0F2FE;
  border: 1px solid #BAE6FD;
  border-radius: var(--border-radius-pill);
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.35rem, 5.5vw, 4rem);
  font-weight: 700;
  line-height: 1.08;
  color: var(--text-main);
  letter-spacing: -0.03em;
  margin-bottom: 1.125rem;
}

.hero-tagline {
  font-size: clamp(1.125rem, 2.2vw, 1.375rem);
  font-weight: 500;
  line-height: 1.45;
  color: #1E293B;
  margin-bottom: 1.25rem;
}

.hero-desc {
  font-size: clamp(0.9375rem, 1.6vw, 1.0625rem);
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 2rem;
  max-width: 580px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.hero-meta-strip {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: clamp(0.875rem, 2vw, 1.75rem);
  padding-top: 1.75rem;
  border-top: 1px solid var(--border-subtle);
}

.meta-item {
  display: flex;
  flex-direction: column;
}

.meta-number {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.2;
}

.meta-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-faint);
}

.meta-divider {
  width: 1px;
  height: 28px;
  background-color: var(--border-subtle);
}

/* --------------------------------------------------------------------------
   9. Book Presentation & Stage
   -------------------------------------------------------------------------- */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.book-stage {
  width: 100%;
  max-width: 440px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.book-flipper {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  max-width: 400px;
  perspective: 1200px;
  margin-bottom: 1.25rem;
}

.book-card {
  position: absolute;
  inset: 0;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-book);
  background-color: var(--bg-surface);
  transition: opacity var(--transition-base), transform var(--transition-smooth);
  border: 1px solid rgba(15, 23, 42, 0.08);
}

.book-card-front {
  z-index: 2;
  opacity: 1;
  transform: rotateY(0deg);
}

.book-card-back {
  z-index: 1;
  opacity: 0;
  transform: rotateY(-15deg);
  pointer-events: none;
}

.book-card.is-active {
  opacity: 1;
  z-index: 3;
  transform: rotateY(0deg);
  pointer-events: auto;
}

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

/* Simulated Realistic Spine Crease */
.book-spine-effect {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 18px;
  background: linear-gradient(90deg, rgba(0, 0, 0, 0.25) 0%, rgba(255, 255, 255, 0.15) 30%, rgba(0, 0, 0, 0.08) 70%, transparent 100%);
  pointer-events: none;
  z-index: 4;
}

.book-glare {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.18) 0%, transparent 50%);
  pointer-events: none;
  z-index: 5;
}

.cover-toggle-wrapper {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--bg-surface);
  padding: 0.35rem 0.5rem;
  border-radius: var(--border-radius-pill);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-sm);
  margin-bottom: 0.75rem;
}

.cover-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.8125rem;
  font-weight: 600;
  padding: 0.45rem 0.95rem;
  min-height: 38px;
  border-radius: var(--border-radius-pill);
  color: var(--text-muted);
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.cover-toggle-btn:active {
  transform: scale(0.97);
}

.toggle-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: #CBD5E1;
  transition: background-color var(--transition-fast);
}

.cover-toggle-btn.active {
  background-color: var(--primary-light);
  color: var(--primary-dark);
}

.cover-toggle-btn.active .toggle-dot {
  background-color: var(--primary);
}

.book-caption {
  font-size: 0.75rem;
  color: var(--text-faint);
  text-align: center;
}

/* --------------------------------------------------------------------------
   10. The Book Section & Specifications
   -------------------------------------------------------------------------- */
.section-book {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.book-details-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2.5rem, 5vw, 4rem);
  align-items: start;
}

.book-details-grid > * {
  min-width: 0;
  max-width: 100%;
}

.editorial-col {
  display: flex;
  flex-direction: column;
  min-width: 0;
  max-width: 100%;
}

.editorial-heading {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  color: var(--text-main);
  margin-bottom: 1rem;
  line-height: 1.25;
}

.editorial-lead {
  font-size: 1.125rem;
  font-weight: 500;
  color: #1E293B;
  line-height: 1.6;
  margin-bottom: 1rem;
}

.editorial-body {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 1.25rem;
}

.editorial-quote-card {
  position: relative;
  background: linear-gradient(135deg, #F0FDF4 0%, #F0FDFA 100%);
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--border-radius-md) var(--border-radius-md) 0;
  padding: clamp(1rem, 2.5vw, 1.75rem);
  margin: 1.5rem 0 2rem;
  overflow-wrap: break-word;
  word-break: break-word;
}

.quote-icon {
  color: var(--primary);
  opacity: 0.3;
  position: absolute;
  top: 1rem;
  right: 1.25rem;
}

.quote-text {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.125rem;
  line-height: 1.55;
  color: #134E4A;
  margin-bottom: 0.5rem;
}

.quote-source {
  font-size: 0.8125rem;
  font-weight: 600;
  color: #0F766E;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.editorial-action {
  margin-top: 1.25rem;
}

.editorial-action .btn {
  padding: 0.8rem 1.625rem;
  font-size: 0.9375rem;
  min-height: 46px;
}

/* Specifications Card */
.spec-col {
  width: 100%;
  min-width: 0;
}

.spec-card {
  background-color: var(--bg-surface-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-lg);
  padding: clamp(1rem, 3vw, 2.25rem);
  box-shadow: var(--shadow-sm);
  box-sizing: border-box;
  min-width: 0;
  max-width: 100%;
}

.spec-card-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-subtle);
}

.spec-list {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}

.spec-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  font-size: 0.9375rem;
  padding-bottom: 0.625rem;
  border-bottom: 1px dashed #CBD5E1;
}

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

.spec-term {
  color: var(--text-faint);
  font-weight: 500;
  flex-shrink: 0;
}

.spec-def {
  color: var(--text-main);
  font-weight: 600;
  text-align: right;
}

.isbn-code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.875rem;
  background-color: #E2E8F0;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
}

.spec-card-footer {
  margin-top: 1.75rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-subtle);
}

.spec-card-footer .btn {
  background-color: var(--bg-surface);
  color: var(--primary-dark);
  border: 1.5px solid var(--primary);
  font-weight: 600;
  font-size: 0.9375rem;
  padding: 0.85rem 1.5rem;
  min-height: 48px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.spec-card-footer .btn:hover {
  background-color: var(--primary);
  color: #FFFFFF;
  border-color: var(--primary);
  box-shadow: 0 6px 18px rgba(13, 148, 136, 0.28);
  transform: translateY(-2px);
}

/* --------------------------------------------------------------------------
   11. Features / Thoughtful Design Grid
   -------------------------------------------------------------------------- */
.section-features {
  background-color: var(--bg-page);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: clamp(1.25rem, 2.5vw, 1.75rem);
}

.feature-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-md);
  padding: clamp(1.5rem, 2.5vw, 2rem);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: #CBD5E1;
}

.feature-icon-wrapper {
  width: 48px;
  height: 48px;
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  flex-shrink: 0;
}

.icon-amber {
  background-color: var(--amber-light);
  color: var(--amber-dark);
}

.icon-teal {
  background-color: var(--primary-light);
  color: var(--primary-dark);
}

.icon-rose {
  background-color: var(--rose-light);
  color: var(--rose);
}

.icon-indigo {
  background-color: var(--indigo-light);
  color: var(--indigo);
}

.feature-title {
  font-family: var(--font-serif);
  font-size: 1.1875rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.625rem;
  line-height: 1.3;
}

.feature-desc {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   12. Mindful Practice Section
   -------------------------------------------------------------------------- */
.section-mindfulness {
  background: linear-gradient(180deg, #F8FAFC 0%, #F1F5F9 100%);
  padding: clamp(3rem, 6vw, 5rem) 0;
}

.mindfulness-card {
  background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
  color: var(--text-inverse);
  border-radius: var(--border-radius-xl);
  padding: clamp(2.25rem, 5vw, 4rem);
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.mindfulness-card::after {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(13, 148, 136, 0.25) 0%, transparent 70%);
  pointer-events: none;
}

.mindfulness-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.mindfulness-content .section-kicker {
  color: #5EEAD4;
}

.mindfulness-title {
  font-family: var(--font-serif);
  font-size: clamp(1.875rem, 4vw, 2.75rem);
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 1.25rem;
  letter-spacing: -0.02em;
}

.mindfulness-text {
  font-size: clamp(1rem, 1.8vw, 1.125rem);
  line-height: 1.7;
  color: #CBD5E1;
  margin-bottom: 1rem;
}

.mindfulness-pills {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 2rem;
}

.pill-tag {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(8px);
  color: #F8FAFC;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.5rem 1.125rem;
  border-radius: var(--border-radius-pill);
}

/* --------------------------------------------------------------------------
   13. About the Author Section
   -------------------------------------------------------------------------- */
.section-about {
  background-color: var(--bg-surface);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(2.5rem, 5vw, 4.5rem);
  align-items: center;
}

.about-content {
  display: flex;
  flex-direction: column;
}

.about-bio {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 1.75rem;
}

.about-bio p {
  margin-bottom: 1rem;
}

.about-bio strong {
  color: var(--text-main);
  font-weight: 600;
}

.about-meta-box {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
  background-color: var(--bg-surface-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-md);
  padding: 1.25rem 1.5rem;
}

.about-meta-item {
  display: flex;
  flex-direction: column;
}

.about-meta-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-faint);
}

.about-meta-val {
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text-main);
  margin-top: 0.25rem;
}

.about-visual {
  display: flex;
  justify-content: center;
}

.portrait-card {
  width: 100%;
  max-width: 380px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-lg);
  padding: 1rem;
  box-shadow: var(--shadow-md);
}

.portrait-frame {
  position: relative;
  border-radius: calc(var(--border-radius-lg) - 6px);
  overflow: hidden;
  background-color: var(--bg-surface-subtle);
  aspect-ratio: 4 / 5;
}

.portrait-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 25%;
  display: block;
}

.portrait-caption {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-top: 0.875rem;
  text-align: center;
}

.portrait-author-name {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-main);
}

.portrait-author-tag {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--primary);
}

/* --------------------------------------------------------------------------
   14. Call To Action Banner
   -------------------------------------------------------------------------- */
.section-cta {
  background-color: var(--bg-page);
  padding: clamp(3rem, 6vw, 5rem) 0;
}

.cta-card {
  background: linear-gradient(135deg, #042F2E 0%, #0D9488 100%);
  color: var(--text-inverse);
  border-radius: var(--border-radius-xl);
  padding: clamp(2rem, 4vw, 3.5rem);
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.cta-inner {
  display: flex;
  align-items: center;
  gap: clamp(2rem, 4vw, 3.5rem);
}

.cta-cover-thumb {
  flex-shrink: 0;
  width: 180px;
  max-width: 30%;
  aspect-ratio: 1 / 1;
  border-radius: var(--border-radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-book);
  border: 2px solid rgba(255, 255, 255, 0.2);
}

.cta-thumb-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cta-body {
  flex-grow: 1;
}

.cta-kicker {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #99F6E4;
  margin-bottom: 0.625rem;
}

.cta-title {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 600;
  line-height: 1.25;
  margin-bottom: 0.875rem;
  letter-spacing: -0.02em;
}

.cta-text {
  font-size: 1rem;
  line-height: 1.6;
  color: #E6FFFA;
  margin-bottom: 1.75rem;
  max-width: 600px;
}

.cta-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.cta-actions .btn-primary {
  background-color: #F59E0B;
  color: #0F172A;
  box-shadow: 0 4px 14px rgba(245, 158, 11, 0.4);
}

.cta-actions .btn-primary:hover {
  background-color: #D97706;
  color: #FFFFFF;
  box-shadow: 0 6px 20px rgba(245, 158, 11, 0.5);
}

.affiliate-disclosure {
  font-size: 0.75rem;
  color: #99F6E4;
  opacity: 0.9;
  line-height: 1.5;
}

/* --------------------------------------------------------------------------
   15. Site Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background-color: #0F172A;
  color: #94A3B8;
  padding: clamp(3rem, 6vw, 4.5rem) 0 2rem;
  border-top: 1px solid #1E293B;
  font-size: 0.875rem;
}

.footer-top {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid #1E293B;
}

.footer-brand-name {
  font-family: var(--font-serif);
  font-size: 1.375rem;
  font-weight: 700;
  color: #FFFFFF;
  display: block;
  margin-bottom: 0.625rem;
}

.footer-brand-desc {
  font-size: 0.875rem;
  line-height: 1.6;
  max-width: 360px;
}

.footer-brand-desc em {
  color: #E2E8F0;
  font-style: normal;
}

.footer-nav-title {
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #F1F5F9;
  display: block;
  margin-bottom: 1rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.footer-links a:hover {
  color: #5EEAD4;
}

.footer-cta-text {
  font-size: 0.875rem;
  margin-bottom: 1rem;
  line-height: 1.5;
}

.footer-cta-col .btn-outline {
  border-color: #334155;
  color: #F8FAFC;
}

.footer-cta-col .btn-outline:hover {
  background-color: #1E293B;
  border-color: #64748B;
}

.footer-bottom {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  padding: 1.75rem 0 1.25rem;
  text-align: center;
}

.copyright-text {
  font-size: 0.8125rem;
}

/* Mandatory Creator Backlink Styling */
.creator-credit {
  font-size: 0.8125rem;
  color: #94A3B8;
}

.creator-credit a {
  color: #5EEAD4;
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--transition-fast);
}

.creator-credit a:hover {
  color: #FFFFFF;
}

.footer-legal {
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  text-align: center;
}

.legal-disclosure {
  font-size: 0.75rem;
  color: #64748B;
  line-height: 1.5;
  max-width: 800px;
  margin: 0 auto;
}

/* --------------------------------------------------------------------------
   16. Responsive Media Queries
   -------------------------------------------------------------------------- */
@media (min-width: 640px) {
  .hero-cta-group {
    flex-direction: row;
  }
}

@media (min-width: 768px) {
  .footer-top {
    grid-template-columns: 2fr 1fr 1.5fr;
  }

  .footer-bottom {
    flex-direction: row;
    text-align: left;
  }
}

@media (min-width: 992px) {
  .hero-grid {
    grid-template-columns: 1.15fr 0.85fr;
  }

  .book-details-grid {
    grid-template-columns: 1.25fr 0.75fr;
  }

  .about-grid {
    grid-template-columns: 1.25fr 0.75fr;
  }
}

/* Mobile Navigation & Header Optimization */
@media (max-width: 860px) {
  .nav-menu {
    display: none;
  }

  .mobile-toggle {
    display: flex;
  }

  .cta-cover-thumb {
    display: none;
  }
}

@media (max-width: 580px) {
  /* On mobile screens, hide the header action button to keep header clean and spacious */
  .header-actions .btn {
    display: none;
  }

  /* Full-width responsive hero buttons for thumb-friendly tap targets */
  .hero-cta-group {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    gap: 0.75rem;
  }

  .hero-cta-group .btn {
    width: 100%;
    justify-content: center;
    padding: 0.875rem 1.5rem;
  }

  /* Full-width editorial action button */
  .editorial-action {
    width: 100%;
  }

  .editorial-action .btn {
    width: 100%;
    justify-content: center;
  }

  /* Full-width CTA banner button */
  .cta-actions {
    width: 100%;
    flex-direction: column;
    align-items: stretch;
  }

  .cta-actions .btn {
    width: 100%;
    justify-content: center;
  }

  /* Full-width footer action */
  .footer-cta-col .btn {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .hero-meta-strip {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .meta-divider {
    display: none;
  }

  .spec-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }

  .spec-def {
    text-align: left;
  }

  .brand-name {
    font-size: 1.125rem;
  }

  .brand-tag {
    font-size: 0.625rem;
  }

  .hero-title {
    font-size: clamp(2rem, 8vw, 2.75rem);
  }
}

@media (max-width: 360px) {
  .top-banner {
    font-size: 0.75rem;
    padding: 0.4rem 0;
  }

  .banner-inner {
    gap: 0.35rem;
  }

  .cover-toggle-wrapper {
    gap: 0.25rem;
    padding: 0.25rem 0.35rem;
  }

  .cover-toggle-btn {
    padding: 0.35rem 0.65rem;
    font-size: 0.75rem;
    min-height: 36px;
  }

  .brand-name {
    font-size: 1rem;
  }
}

/* --------------------------------------------------------------------------
   17. Motion Accessibility (prefers-reduced-motion)
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}