/* ==========================================================================
   BO2K — Atomic Habits Immersive Reading Experience Styles
   Visual language inspired by the actual physical cover:
   Warm cream/ivory paper, deep ink typography, muted gold & beige accents.
   ========================================================================== */

:root {
  --atomic-bg: #F9F6F0;
  --atomic-surface: #F3EFE6;
  --atomic-surface-card: #FFFFFF;
  --atomic-text-primary: #0E0E0C;
  --atomic-text-secondary: #33312B;
  --atomic-text-muted: #726E65;
  --atomic-gold: #C5A86E;
  --atomic-gold-dark: #8C733E;
  --atomic-gold-light: #F2EADA;
  --atomic-border: #E4DDCF;
  --atomic-border-fine: rgba(140, 115, 62, 0.18);
  --atomic-shadow: 0 4px 20px rgba(14, 14, 12, 0.06), 0 1px 3px rgba(14, 14, 12, 0.04);
  --atomic-shadow-raised: 0 12px 36px rgba(14, 14, 12, 0.1), 0 2px 6px rgba(14, 14, 12, 0.04);
}

/* Page Container */
.atomic-reading-page {
  background-color: var(--atomic-bg);
  color: var(--atomic-text-primary);
  min-height: 100vh;
  padding-bottom: 6rem;
  position: relative;
}

/* Sticky Minimal Reading Progress Indicator */
.atomic-progress-bar-wrap {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  height: 3px;
  background-color: var(--atomic-border);
  z-index: 95;
}

.atomic-progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--atomic-gold), var(--atomic-gold-dark));
  width: 0%;
  transition: width 120ms ease-out;
}

/* ==========================================================================
   BOOK COVER IMAGE FRAMING
   ========================================================================== */
.book-cover-image-frame {
  position: relative;
  width: 100%;
  max-width: 280px;
  margin: 0 auto;
  aspect-ratio: 2 / 3;
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: 0 16px 40px rgba(14, 14, 12, 0.16), 0 2px 8px rgba(14, 14, 12, 0.08);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  background-color: #ECE5D8;
}

.book-cover-image-frame:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 48px rgba(14, 14, 12, 0.2);
}

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

.book-cover-image-lighting {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 16px;
  background: linear-gradient(90deg, rgba(255,255,255,0.2) 0%, rgba(0,0,0,0.15) 50%, transparent 100%);
  pointer-events: none;
  z-index: 2;
}

.book-cover-image-thumb-wrapper {
  width: 58px;
  height: 84px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(14, 14, 12, 0.12);
  flex-shrink: 0;
}

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

/* ==========================================================================
   BOOK HERO (ATOMIC HABITS)
   ========================================================================== */
.atomic-hero-wrapper {
  max-width: var(--max-content-width);
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 2rem;
}

@media (min-width: 840px) {
  .atomic-hero-wrapper {
    display: grid;
    grid-template-columns: 320px 1fr;
    align-items: center;
    text-align: left;
    gap: 4.5rem;
    padding: 4rem 2.5rem 5rem;
  }
}

.atomic-hero-cover-col {
  width: 100%;
  display: flex;
  justify-content: center;
}

.atomic-hero-details {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

@media (min-width: 840px) {
  .atomic-hero-details {
    align-items: flex-start;
  }
}

.atomic-hero-meta {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-weight: 600;
  color: var(--atomic-gold-dark);
}

.atomic-hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--atomic-text-primary);
}

.atomic-hero-author {
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--atomic-text-secondary);
}

.atomic-hero-tagline {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.25rem;
  line-height: 1.4;
  color: var(--atomic-gold-dark);
  margin: 0.25rem 0;
}

.atomic-hero-desc {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--atomic-text-secondary);
  max-width: 520px;
}

.atomic-hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-top: 1rem;
}

@media (min-width: 840px) {
  .atomic-hero-actions {
    justify-content: flex-start;
  }
}

/* ==========================================================================
   READING CONTENT CONTAINER (MOBILE OPTIMIZED: 390 × 844)
   ========================================================================== */
.atomic-reading-container {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 4rem;
}

@media (min-width: 640px) {
  .atomic-reading-container {
    padding: 0 2rem;
  }
}

/* Section Header Structure */
.atomic-section {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  position: relative;
}

.atomic-section-eyebrow {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--atomic-gold-dark);
}

.atomic-section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 4.5vw, 2.5rem);
  font-weight: 500;
  line-height: 1.2;
  color: var(--atomic-text-primary);
  letter-spacing: -0.015em;
}

.atomic-body-text {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--atomic-text-secondary);
}

/* ==========================================================================
   CONTENT MODULE 1: THE WHOLE BOOK IN ONE SENTENCE
   ========================================================================== */
.atomic-sentence-box {
  background-color: var(--atomic-surface);
  border: 1px solid var(--atomic-border);
  border-left: 4px solid var(--atomic-gold);
  border-radius: var(--radius-sm);
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
  box-shadow: var(--atomic-shadow);
}

.atomic-sentence-label {
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--atomic-gold-dark);
}

.atomic-sentence-quote {
  font-family: var(--font-serif);
  font-size: clamp(1.15rem, 2.8vw, 1.45rem);
  line-height: 1.55;
  font-weight: 500;
  color: var(--atomic-text-primary);
}

/* ==========================================================================
   CONTENT MODULE 2: VISUAL FORMULA & 1% RULE
   ========================================================================== */
.atomic-formula-banner {
  background-color: var(--atomic-gold-light);
  border: 1px solid var(--atomic-border);
  padding: 1.125rem 1.5rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--atomic-text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  letter-spacing: 0.02em;
}

/* ==========================================================================
   CONTENT MODULE 3: GOALS VS SYSTEMS COMPARISON
   ========================================================================== */
.atomic-comparison-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

@media (min-width: 580px) {
  .atomic-comparison-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.atomic-compare-card {
  background-color: var(--atomic-surface);
  border: 1px solid var(--atomic-border);
  border-radius: var(--radius-sm);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.atomic-compare-card.system {
  border-top: 3px solid var(--atomic-gold-dark);
}

.atomic-compare-card.goal {
  border-top: 3px solid var(--atomic-text-muted);
}

.atomic-compare-tag {
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--atomic-gold-dark);
}

.atomic-compare-head {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 500;
  color: var(--atomic-text-primary);
}

.atomic-example-pair {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1.25rem;
  background-color: rgba(255, 255, 255, 0.6);
  border: 1px solid var(--atomic-border);
  border-radius: var(--radius-sm);
}

/* ==========================================================================
   CONTENT MODULE 4: IDENTITY (OUTCOME → PROCESS → IDENTITY)
   ========================================================================== */
.atomic-layers-stack {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.atomic-layer-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.125rem 1.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--atomic-border);
  background-color: var(--atomic-surface);
}

.atomic-layer-item.identity {
  background-color: var(--atomic-gold-light);
  border-color: var(--atomic-gold);
}

.atomic-layer-name {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--atomic-text-primary);
}

.atomic-layer-desc {
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  font-style: italic;
  color: var(--atomic-text-secondary);
}

/* ==========================================================================
   CONTENT MODULE 5: THE HABIT LOOP
   ========================================================================== */
.atomic-loop-strip {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

@media (min-width: 600px) {
  .atomic-loop-strip {
    grid-template-columns: repeat(4, 1fr);
  }
}

.atomic-loop-node {
  background-color: var(--atomic-surface);
  border: 1px solid var(--atomic-border);
  padding: 1.25rem 1rem;
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.35rem;
}

.atomic-loop-node-num {
  font-size: 0.625rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--atomic-gold-dark);
  font-weight: 700;
}

.atomic-loop-node-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--atomic-text-primary);
}

/* ==========================================================================
   CONTENT MODULE 6: THE FOUR LAWS CARDS
   ========================================================================== */
.atomic-four-laws-grid {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.atomic-law-card {
  background-color: var(--atomic-surface);
  border: 1px solid var(--atomic-border);
  border-radius: var(--radius-sm);
  padding: 1.75rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: transform var(--transition-fast);
}

.atomic-law-card:hover {
  transform: translateY(-2px);
  border-color: var(--atomic-gold);
}

.atomic-law-top {
  display: flex;
  align-items: baseline;
  gap: 0.875rem;
}

.atomic-law-num {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--atomic-gold-dark);
}

.atomic-law-name {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 500;
  color: var(--atomic-text-primary);
}

.atomic-law-example {
  background-color: rgba(255, 255, 255, 0.7);
  border-left: 2px solid var(--atomic-gold);
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  color: var(--atomic-text-secondary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* ==========================================================================
   CONTENT MODULE 7: THE 2-MINUTE RULE
   ========================================================================== */
.atomic-2min-feature {
  background-color: var(--atomic-text-primary);
  color: var(--atomic-bg);
  padding: 2.25rem 1.75rem;
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  box-shadow: var(--atomic-shadow-raised);
}

.atomic-2min-label {
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--atomic-gold);
  font-weight: 700;
}

.atomic-2min-statement {
  font-family: var(--font-serif);
  font-size: clamp(1.35rem, 3.5vw, 1.85rem);
  line-height: 1.35;
  color: #FFFFFF;
}

.atomic-2min-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem;
}

.atomic-2min-chip {
  background-color: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  border-radius: var(--radius-pill);
  color: #F8F5EE;
}

/* ==========================================================================
   CONTENT MODULE 8: BREAKING BAD HABITS
   ========================================================================== */
.atomic-bad-habits-table {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--atomic-border);
}

.atomic-bad-habit-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  padding: 1.125rem 0.5rem;
  border-bottom: 1px solid var(--atomic-border);
  font-size: 0.9375rem;
}

.atomic-bad-habit-row .good {
  color: var(--atomic-text-primary);
  font-weight: 500;
}

.atomic-bad-habit-row .bad {
  color: var(--atomic-text-muted);
  font-style: italic;
}

/* ==========================================================================
   CONTENT MODULE 14: 60-SECOND SUMMARY CHECKLIST
   ========================================================================== */
.atomic-summary-checklist {
  background-color: var(--atomic-surface);
  border: 1px solid var(--atomic-border);
  padding: 2rem 1.5rem;
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.atomic-checklist-item {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--atomic-text-secondary);
}

.atomic-check-bullet {
  color: var(--atomic-gold-dark);
  font-weight: 700;
  font-size: 1rem;
}

/* ==========================================================================
   FINAL MINIMAL STATEMENT & EPILOGUE
   ========================================================================== */
.atomic-final-box {
  text-align: center;
  padding: 4rem 1.5rem 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  border-top: 1px solid var(--atomic-border);
  margin-top: 2rem;
}

.atomic-final-quote {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: clamp(1.35rem, 3.5vw, 1.85rem);
  line-height: 1.5;
  color: var(--atomic-text-primary);
  max-width: 580px;
}

.atomic-final-author {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--atomic-gold-dark);
  font-weight: 600;
}