/**
 * THE BARRIER RECOVERY - DESIGN SYSTEM
 * Editorial / Medical / Premium / Sophisticated
 */

:root {
    /* Color Palette */
    --color-bg: #F9F8F6;
    --color-bg-alt: #F3EFEA;
    --color-surface: #FFFFFF;
    --color-text: #111827;
    --color-text-muted: #52525B;
    --color-text-subtle: #71717A;
    --color-primary: #1A382B;
    --color-primary-soft: #234E3D;
    --color-primary-light: #EBF3EE;
    --color-border: #E5E2DC;
    --color-border-dark: #D4CEBF;
    --color-accent: #D97706;
    --color-accent-badge: #F59E0B;
    --color-accent-bg: #FEF3C7;
    --color-badge-dark: #1F2421;

    /* Typography */
    --font-heading: "Playfair Display", "Cormorant Garamond", Georgia, "Times New Roman", serif;
    --font-body: "Plus Jakarta Sans", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

    /* Layout & Containers */
    --container-max: 1200px;
    --container-wide: 1320px;
    --container-narrow: 840px;
    --header-height: 80px;

    /* Elevation & Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(26, 56, 43, 0.08);
    --shadow-lg: 0 12px 32px rgba(26, 56, 43, 0.12);
    --shadow-book: 0 16px 36px rgba(0, 0, 0, 0.18), 0 2px 6px rgba(0, 0, 0, 0.08);

    /* Radii */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 14px;
    --radius-pill: 9999px;

    /* Transitions */
    --transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ==========================================================================
   Base Reset
   ========================================================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.65;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

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

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

a:hover {
    color: var(--color-primary-soft);
}

ul, ol {
    list-style: none;
}

button, input, select, textarea {
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
}

/* ==========================================================================
   Typography Hierarchy
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--color-text);
    line-height: 1.25;
    font-weight: 700;
    letter-spacing: -0.015em;
}

.display-title {
    font-size: clamp(2.25rem, 5vw, 3.75rem);
    line-height: 1.15;
}

h1, .h1 {
    font-size: clamp(2rem, 4vw, 3rem);
}

h2, .h2 {
    font-size: clamp(1.5rem, 3vw, 2.25rem);
}

h3, .h3 {
    font-size: clamp(1.25rem, 2.2vw, 1.65rem);
}

h4, .h4 {
    font-size: 1.15rem;
    font-weight: 600;
}

p {
    margin-bottom: 1.25rem;
}

p:last-child {
    margin-bottom: 0;
}

.text-muted {
    color: var(--color-text-muted);
}

.text-subtle {
    color: var(--color-text-subtle);
}

.eyebrow {
    display: inline-block;
    font-family: var(--font-body);
    font-size: 0.8125rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--color-primary);
    margin-bottom: 0.75rem;
}

/* ==========================================================================
   Layout Containers
   ========================================================================== */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin-left: auto;
    margin-right: auto;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
}

.container-wide {
    width: 100%;
    max-width: var(--container-wide);
    margin-left: auto;
    margin-right: auto;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
}

.container-narrow {
    width: 100%;
    max-width: var(--container-narrow);
    margin-left: auto;
    margin-right: auto;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
}

.section {
    padding-top: clamp(3.5rem, 6vw, 6rem);
    padding-bottom: clamp(3.5rem, 6vw, 6rem);
}

.section-tight {
    padding-top: clamp(2rem, 4vw, 3.5rem);
    padding-bottom: clamp(2rem, 4vw, 3.5rem);
}

.section-alt {
    background-color: var(--color-bg-alt);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.65rem;
    font-size: 0.9375rem;
    font-weight: 600;
    line-height: 1;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--color-primary);
    color: #FFFFFF;
    border-color: var(--color-primary);
}

.btn-primary:hover {
    background-color: var(--color-primary-soft);
    color: #FFFFFF;
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-text);
    border-color: var(--color-border-dark);
}

.btn-secondary:hover {
    background-color: #FFFFFF;
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.btn-lg {
    padding: 0.95rem 2rem;
    font-size: 1rem;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
}

.btn-full {
    width: 100%;
}

/* ==========================================================================
   Badges & Chips
   ========================================================================== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.65rem;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    border-radius: var(--radius-pill);
    line-height: 1;
}

.badge-number {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    font-family: var(--font-heading);
    font-size: 0.8125rem;
    border-radius: var(--radius-sm);
    padding: 0.35rem 0.55rem;
}

.badge-accent {
    background-color: var(--color-accent-bg);
    color: var(--color-accent);
    border: 1px solid #FDE68A;
}

.badge-dark {
    background-color: var(--color-primary);
    color: #FFFFFF;
}

.badge-success {
    background-color: #DEF7EC;
    color: #03543F;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
    position: sticky;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: rgba(249, 248, 246, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
    transition: var(--transition);
}

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

.brand-logo {
    display: flex;
    flex-direction: column;
    text-decoration: none;
}

.brand-name {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 800;
    letter-spacing: 0.05em;
    color: var(--color-text);
    line-height: 1.15;
    text-transform: uppercase;
}

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

.nav-desktop {
    display: flex;
    align-items: center;
    gap: 2.25rem;
}

.nav-link {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text-muted);
    transition: var(--transition);
}

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

.header-actions {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.currency-selector {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-text-muted);
    padding: 0.4rem 0.65rem;
    background: #FFFFFF;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: default;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    color: var(--color-text);
}

.mobile-menu-btn svg {
    width: 24px;
    height: 24px;
}

/* Mobile Nav Drawer */
.mobile-nav-drawer {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background-color: var(--color-bg);
    padding: 2rem 1.5rem;
    border-top: 1px solid var(--color-border);
    z-index: 99;
    flex-direction: column;
    justify-content: space-between;
    overflow-y: auto;
}

.mobile-nav-drawer.open {
    display: flex;
}

.mobile-nav-links {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.mobile-nav-links .nav-link {
    font-size: 1.15rem;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
    padding-top: clamp(3rem, 5vw, 4.5rem);
    padding-bottom: clamp(3.5rem, 6vw, 5rem);
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: clamp(2rem, 5vw, 4rem);
    align-items: center;
}

.hero-content {
    max-width: 580px;
}

.hero-title {
    margin-bottom: 1.25rem;
    color: var(--color-text);
}

.hero-desc {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    margin-bottom: 2rem;
    line-height: 1.6;
}

.hero-badges-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.85rem 1.5rem;
    margin-bottom: 2.25rem;
}

.badge-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-muted);
}

.badge-item svg {
    width: 18px;
    height: 18px;
    color: var(--color-primary);
    flex-shrink: 0;
}

.hero-ctas {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

/* ==========================================================================
   Ebook Visual / 3D Book System
   ========================================================================== */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.book-bundle-card {
    position: relative;
    background: #FFFFFF;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 2.5rem;
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.bundle-badge-top {
    position: absolute;
    top: -12px;
    right: 24px;
    background: var(--color-accent-badge);
    color: #FFFFFF;
    font-weight: 700;
    font-size: 0.75rem;
    padding: 0.35rem 0.85rem;
    border-radius: var(--radius-pill);
    box-shadow: var(--shadow-sm);
    letter-spacing: 0.05em;
}

.bundle-image-box {
    max-width: 380px;
    width: 100%;
    margin-bottom: 1.5rem;
    border-radius: var(--radius-sm);
    overflow: hidden;
}

/* CSS Book Cover Mockup */
.book-cover {
    position: relative;
    width: 100%;
    aspect-ratio: 3 / 4;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-book);
    padding: 1.75rem 1.25rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    color: #FFFFFF;
    overflow: hidden;
    transition: var(--transition);
}

.book-cover:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.22);
}

.book-cover::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 12px;
    height: 100%;
    background: linear-gradient(to right, rgba(0,0,0,0.35), rgba(0,0,0,0.05), rgba(255,255,255,0.15));
    border-right: 1px solid rgba(0,0,0,0.15);
}

.book-cover-green {
    background: linear-gradient(145deg, #1A382B, #11261D);
}

.book-cover-cream {
    background: linear-gradient(145deg, #F3EFEA, #E5E0D8);
    color: var(--color-text);
}

.book-cover-cream::after {
    background: linear-gradient(to right, rgba(0,0,0,0.15), rgba(0,0,0,0.02), rgba(255,255,255,0.3));
}

.book-cover-dark {
    background: linear-gradient(145deg, #1F2421, #141715);
}

.book-cover-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.book-cover-number {
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.2rem 0.5rem;
    border: 1px solid currentColor;
    border-radius: var(--radius-sm);
    opacity: 0.85;
}

.book-cover-main {
    margin-top: auto;
    margin-bottom: auto;
    text-align: center;
    padding: 0.5rem 0;
}

.book-cover-title {
    font-family: var(--font-heading);
    font-size: 1.35rem;
    line-height: 1.25;
    margin-bottom: 0.5rem;
    color: inherit;
}

.book-cover-sub {
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    opacity: 0.75;
}

.book-cover-footer {
    font-size: 0.625rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    opacity: 0.6;
    display: flex;
    justify-content: space-between;
}

/* ==========================================================================
   Ebooks Grid Showcase (3 Books)
   ========================================================================== */
.section-header {
    text-align: center;
    max-width: 680px;
    margin: 0 auto 3.5rem auto;
}

.section-header .eyebrow {
    margin-bottom: 0.5rem;
}

.section-header h2 {
    margin-bottom: 1rem;
}

.section-divider {
    width: 60px;
    height: 3px;
    background-color: var(--color-primary);
    margin: 1.25rem auto 0 auto;
}

.ebooks-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.ebook-card {
    background: #FFFFFF;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.ebook-card:hover {
    border-color: var(--color-primary-soft);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.ebook-card-cover {
    width: 100%;
    max-width: 220px;
    margin: 0 auto 1.75rem auto;
}

.ebook-card-title {
    font-size: 1.35rem;
    margin-bottom: 0.75rem;
    color: var(--color-text);
}

.ebook-card-desc {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.ebook-card-features {
    border-top: 1px solid var(--color-border);
    padding-top: 1.25rem;
    margin-bottom: 1.5rem;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-bottom: 0.65rem;
}

.feature-item svg {
    width: 16px;
    height: 16px;
    color: var(--color-primary);
    margin-top: 3px;
    flex-shrink: 0;
}

.ebook-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-top: 1px solid var(--color-border);
    padding-top: 1.25rem;
}

.price-box {
    display: flex;
    align-items: baseline;
    gap: 0.35rem;
}

.price-current {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-text);
    line-height: 1;
}

.price-original {
    font-size: 0.9375rem;
    color: var(--color-text-subtle);
    text-decoration: line-through;
}

.buy-link {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-primary);
}

.buy-link:hover {
    gap: 0.55rem;
}

/* ==========================================================================
   Bundle Highlight Banner
   ========================================================================== */
.bundle-banner {
    background: linear-gradient(135deg, #1A382B, #11261D);
    color: #FFFFFF;
    border-radius: var(--radius-lg);
    padding: clamp(2.5rem, 5vw, 4rem);
    box-shadow: var(--shadow-lg);
    margin-top: 4rem;
}

.bundle-banner-grid {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    max-width: 720px;
    margin: 0 auto;
}

.bundle-banner-title {
    color: #FFFFFF;
    font-size: clamp(1.85rem, 3.5vw, 2.65rem);
    margin-bottom: 0.85rem;
}

.bundle-banner-desc {
    color: #D1D5DB;
    font-size: 1.125rem;
    margin-bottom: 2rem;
}

.bundle-price-wrap {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    margin-bottom: 2rem;
}

.bundle-price-old {
    font-size: 1.5rem;
    color: #9CA3AF;
    text-decoration: line-through;
}

.bundle-price-new {
    font-family: var(--font-heading);
    font-size: 3rem;
    font-weight: 700;
    color: #FFFFFF;
    line-height: 1;
}

/* ==========================================================================
   Payment Trust Badges
   ========================================================================== */
.payment-trust-section {
    text-align: center;
    padding-top: 3rem;
    padding-bottom: 3rem;
    border-top: 1px solid var(--color-border);
}

.payment-trust-title {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--color-text-subtle);
    margin-bottom: 1.25rem;
}

.payment-icons {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.25rem;
    flex-wrap: wrap;
}

.payment-pill {
    padding: 0.4rem 0.85rem;
    background: #FFFFFF;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    text-transform: uppercase;
}

/* ==========================================================================
   Reviews / Testimonials Section
   ========================================================================== */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.review-card {
    background: #FFFFFF;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-sm);
}

.review-stars {
    display: flex;
    gap: 0.2rem;
    color: #F59E0B;
    margin-bottom: 1rem;
}

.review-stars svg {
    width: 16px;
    height: 16px;
    fill: currentColor;
}

.review-quote {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--color-text);
    font-style: italic;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.review-author {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    border-top: 1px solid var(--color-border);
    padding-top: 1rem;
}

.author-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-pill);
    background: var(--color-primary);
    color: #FFFFFF;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.875rem;
    flex-shrink: 0;
}

.author-name {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--color-text);
}

.author-product {
    font-size: 0.75rem;
    color: var(--color-text-subtle);
}

/* ==========================================================================
   Post Layout (3 Columns: TOC / Article / Promo)
   ========================================================================== */
.post-layout-grid {
    display: grid;
    grid-template-columns: 240px 1fr 280px;
    gap: 3rem;
    align-items: start;
}

.post-toc-sticky {
    position: sticky;
    top: calc(var(--header-height) + 2rem);
    max-height: calc(100vh - var(--header-height) - 4rem);
    overflow-y: auto;
    padding-right: 1rem;
}

.toc-title {
    font-family: var(--font-body);
    font-size: 0.8125rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-subtle);
    margin-bottom: 1rem;
}

.toc-list {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
    border-left: 2px solid var(--color-border);
}

.toc-item {
    padding-left: 1rem;
}

.toc-item.h3 {
    padding-left: 1.75rem;
}

.toc-link {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    display: block;
    line-height: 1.4;
    transition: var(--transition);
}

.toc-link:hover,
.toc-link.active {
    color: var(--color-primary);
    font-weight: 600;
}

/* Article Body */
.article-main {
    max-width: 100%;
}

.article-header {
    margin-bottom: 2.5rem;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.875rem;
    color: var(--color-text-subtle);
    margin-top: 0.75rem;
}

.article-body {
    font-size: 1.0625rem;
    line-height: 1.8;
    color: #27272A;
}

.article-body h2 {
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--color-border);
}

.article-body h3 {
    margin-top: 2rem;
    margin-bottom: 0.75rem;
}

.article-body ul, .article-body ol {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

.article-body ul li {
    list-style-type: disc;
    margin-bottom: 0.5rem;
}

.article-body ol li {
    list-style-type: decimal;
    margin-bottom: 0.5rem;
}

/* Post Promo Sidebar */
.post-sidebar-sticky {
    position: sticky;
    top: calc(var(--header-height) + 2rem);
}

.promo-box {
    background: #FFFFFF;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1.75rem;
    box-shadow: var(--shadow-sm);
    text-align: center;
}

.promo-label {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-primary);
    margin-bottom: 0.75rem;
}

.promo-cover-wrap {
    max-width: 140px;
    margin: 0 auto 1.25rem auto;
}

.promo-title {
    font-size: 1.15rem;
    margin-bottom: 0.5rem;
}

.promo-desc {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: 1.25rem;
}

/* ==========================================================================
   Handbook / Page Layout (Hierarchical Doc Tree)
   ========================================================================== */
.page-layout-grid {
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 3.5rem;
    align-items: start;
}

.page-sidebar-sticky {
    position: sticky;
    top: calc(var(--header-height) + 2rem);
}

.handbook-tree-title {
    font-size: 0.8125rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-subtle);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--color-border);
}

.handbook-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.handbook-item a {
    display: block;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-muted);
}

.handbook-item.active a {
    background: var(--color-primary-light);
    color: var(--color-primary);
    font-weight: 700;
}

.handbook-item a:hover {
    background: #FFFFFF;
    color: var(--color-primary);
}

/* ==========================================================================
   Ebook Detail Page
   ========================================================================== */
.ebook-detail-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 4rem;
    align-items: start;
}

.ebook-detail-sticky {
    position: sticky;
    top: calc(var(--header-height) + 2rem);
    text-align: center;
}

.ebook-detail-cover {
    max-width: 380px;
    margin: 0 auto 1.5rem auto;
}

.format-badges {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-top: 1rem;
}

.format-chip {
    padding: 0.3rem 0.65rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--color-text-muted);
    background: #FFFFFF;
}

/* ==========================================================================
   Preview Modal
   ========================================================================== */
.modal-backdrop {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(17, 24, 39, 0.75);
    backdrop-filter: blur(4px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
}

.modal-backdrop.active {
    display: flex;
}

.modal-dialog {
    background: #FFFFFF;
    border-radius: var(--radius-md);
    width: 100%;
    max-width: 760px;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    animation: modalIn 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalIn {
    from { opacity: 0; transform: translateY(12px) scale(0.98); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 1.75rem;
    border-bottom: 1px solid var(--color-border);
}

.modal-title {
    font-size: 1.25rem;
    margin: 0;
}

.modal-close-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    color: var(--color-text-subtle);
    border-radius: var(--radius-sm);
    display: flex;
}

.modal-close-btn:hover {
    color: var(--color-text);
    background: var(--color-bg);
}

.modal-body {
    padding: 2rem 1.75rem;
    overflow-y: auto;
    line-height: 1.75;
}

.modal-footer {
    padding: 1.25rem 1.75rem;
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--color-bg);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
    background: #111827;
    color: #9CA3AF;
    padding-top: 4.5rem;
    padding-bottom: 3rem;
    border-top: 1px solid #1F2937;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 4rem;
}

.footer-brand .brand-name {
    color: #FFFFFF;
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.footer-brand p {
    font-size: 0.9375rem;
    color: #9CA3AF;
    max-width: 320px;
}

.footer-heading {
    font-family: var(--font-body);
    font-size: 0.8125rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: #FFFFFF;
    margin-bottom: 1.25rem;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-links a {
    color: #9CA3AF;
    font-size: 0.875rem;
}

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

.footer-bottom {
    border-top: 1px solid #1F2937;
    padding-top: 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.8125rem;
    color: #6B7280;
    flex-wrap: wrap;
    gap: 1rem;
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 1024px) {
    .ebooks-grid, .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .post-layout-grid {
        grid-template-columns: 200px 1fr;
    }
    
    .post-sidebar-sticky {
        display: none;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-desktop {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
    }

    .hero-grid {
        grid-template-columns: 1fr;
    }

    .hero-content {
        max-width: 100%;
        text-align: center;
    }

    .hero-badges-grid {
        justify-content: center;
    }

    .hero-ctas {
        justify-content: center;
    }

    .ebooks-grid, .reviews-grid {
        grid-template-columns: 1fr;
    }

    .post-layout-grid {
        grid-template-columns: 1fr;
    }

    .post-toc-sticky {
        position: static;
        max-height: none;
        margin-bottom: 2rem;
        background: #FFFFFF;
        padding: 1.25rem;
        border: 1px solid var(--color-border);
        border-radius: var(--radius-sm);
    }

    .page-layout-grid {
        grid-template-columns: 1fr;
    }

    .page-sidebar-sticky {
        position: static;
        margin-bottom: 2rem;
    }

    .ebook-detail-grid {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}