/* ==========================================================================
   DESIGN SYSTEM & VARIABLES (Calm Teal, Warm Sand, Muted Gold, Soft White)
   ========================================================================== */
:root {
    --color-primary: #2A5A60;       /* Calm Teal */
    --color-primary-light: #3E7981;
    --color-primary-dark: #1C3E42;
    --color-bg-warm: #FDFBF9;       /* Soft warm white */
    --color-card-bg: #FFFFFF;
    --color-sand: #E8D8C8;          /* Warm Sand */
    --color-sand-light: #F4ECE3;
    --color-gold: #C5A880;          /* Muted Gold */
    --color-gold-light: #E2D6C5;
    --color-text: #2B2B2B;          /* Soft Charcoal */
    --color-text-muted: #6B6B6B;
    --font-headers: 'Outfit', 'Inter', sans-serif;
    --font-body: 'Lora', 'Inter', serif;
    --shadow-soft: 0 8px 30px rgba(42, 90, 96, 0.06);
    --shadow-medium: 0 12px 40px rgba(42, 90, 96, 0.1);
    --radius-small: 8px;
    --radius-medium: 16px;
    --radius-large: 24px;
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================================================
   BASE & RESET
   ========================================================================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--color-bg-warm);
    color: var(--color-text);
    font-family: var(--font-body);
    font-size: 18px;
    line-height: 1.7;
    overflow-x: hidden;
}

h1, h2, h3, h4 {
    font-family: var(--font-headers);
    color: var(--color-primary-dark);
    font-weight: 600;
}

/* ==========================================================================
   LAYOUT
   ========================================================================== */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar Navigation */
.sidebar {
    width: 320px;
    background-color: var(--color-card-bg);
    border-right: 1px solid rgba(42, 90, 96, 0.08);
    padding: 2.5rem 1.5rem;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: var(--transition-smooth);
}

.brand-section {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 2.5rem;
}

.brand-logo {
    width: 40px;
    height: 40px;
    background-color: var(--color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
    box-shadow: 0 4px 10px rgba(42, 90, 96, 0.2);
}

.brand-title {
    font-family: var(--font-headers);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary-dark);
}

.nav-menu {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-item a {
    display: flex;
    align-items: center;
    padding: 0.85rem 1rem;
    color: var(--color-text-muted);
    text-decoration: none;
    font-family: var(--font-headers);
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: var(--radius-small);
    transition: var(--transition-smooth);
    border-left: 3px solid transparent;
}

.nav-item a:hover {
    background-color: var(--color-sand-light);
    color: var(--color-primary-dark);
}

.nav-item.active a {
    background-color: var(--color-sand-light);
    color: var(--color-primary);
    border-left-color: var(--color-primary);
    font-weight: 600;
}

/* Chevron indicator for expandable menu items */
.nav-item.has-submenu a::after {
    content: '▶';
    margin-left: auto;
    font-size: 0.65rem;
    font-weight: 700;
    line-height: 1;
    transition: transform 0.2s ease;
    opacity: 0.5;
}

.nav-item.has-submenu.active a::after {
    transform: rotate(90deg);
    color: var(--color-primary);
    opacity: 1;
}

.nav-sub-item {
    display: none;
    margin-left: 1rem;
}

.nav-item[data-panel="panel-preface"].active ~ .nav-sub-item[data-panel="panel-preface"] { display: block; }
.nav-item[data-panel="panel-stress"].active ~ .nav-sub-item[data-panel="panel-stress"] { display: block; }
.nav-item[data-panel="panel-diagnosis"].active ~ .nav-sub-item[data-panel="panel-diagnosis"] { display: block; }
.nav-item[data-panel="panel-brain"].active ~ .nav-sub-item[data-panel="panel-brain"] { display: block; }
.nav-item[data-panel="panel-adhd"].active ~ .nav-sub-item[data-panel="panel-adhd"] { display: block; }
.nav-item[data-panel="panel-burnout"].active ~ .nav-sub-item[data-panel="panel-burnout"] { display: block; }
.nav-item[data-panel="panel-ch6"].active ~ .nav-sub-item[data-panel="panel-ch6"] { display: block; }
.nav-item[data-panel="panel-stories"].active ~ .nav-sub-item[data-panel="panel-stories"] { display: block; }

/* Collapse active sub-menus if collapsed class is present */
.nav-item.collapsed.has-submenu a::after {
    transform: rotate(0deg) !important;
}

.nav-item[data-panel="panel-preface"].active.collapsed ~ .nav-sub-item[data-panel="panel-preface"] { display: none !important; }
.nav-item[data-panel="panel-stress"].active.collapsed ~ .nav-sub-item[data-panel="panel-stress"] { display: none !important; }
.nav-item[data-panel="panel-diagnosis"].active.collapsed ~ .nav-sub-item[data-panel="panel-diagnosis"] { display: none !important; }
.nav-item[data-panel="panel-brain"].active.collapsed ~ .nav-sub-item[data-panel="panel-brain"] { display: none !important; }
.nav-item[data-panel="panel-adhd"].active.collapsed ~ .nav-sub-item[data-panel="panel-adhd"] { display: none !important; }
.nav-item[data-panel="panel-burnout"].active.collapsed ~ .nav-sub-item[data-panel="panel-burnout"] { display: none !important; }
.nav-item[data-panel="panel-ch6"].active.collapsed ~ .nav-sub-item[data-panel="panel-ch6"] { display: none !important; }
.nav-item[data-panel="panel-stories"].active.collapsed ~ .nav-sub-item[data-panel="panel-stories"] { display: none !important; }

.nav-sub-item a {
    display: flex;
    align-items: center;
    padding: 0.5rem 1rem;
    color: var(--color-text-muted);
    text-decoration: none;
    font-family: var(--font-headers);
    font-size: 0.85rem;
    font-weight: 400;
    border-radius: var(--radius-small);
    transition: var(--transition-smooth);
    border-left: 2px solid transparent;
}

.nav-sub-item a:hover {
    color: var(--color-primary);
    background-color: rgba(217, 136, 109, 0.05);
}

.nav-sub-item.active a {
    color: var(--color-primary-dark);
    border-left-color: var(--color-primary-light);
    font-weight: 600;
    background-color: var(--color-sand-light);
}

/* Main Content Area */
.main-content {
    margin-left: 320px;
    flex: 1;
    padding: 3rem 4rem;
    max-width: 1000px;
    transition: var(--transition-smooth);
}

/* ==========================================================================
   COMPONENTS
   ========================================================================== */
.section-panel {
    display: none;
    animation: fadeIn 0.4s ease;
}

.section-panel.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Premium Typographic Book Cover Styling */
.cover-page-container {
    display: flex;
    max-width: 650px;
    margin: 2rem auto;
    background-color: var(--color-card-bg);
    border-radius: var(--radius-medium);
    box-shadow: var(--shadow-medium);
    border: 1px solid rgba(42, 90, 96, 0.08);
    overflow: hidden;
    min-height: 70vh;
    position: relative;
}

.cover-book-spine {
    width: 25px;
    background: linear-gradient(90deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, var(--color-primary-light) 100%);
    box-shadow: inset -5px 0 10px rgba(0,0,0,0.15);
}

.cover-book-content {
    flex: 1;
    padding: 4rem 3.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    text-align: center;
    background: linear-gradient(135deg, #FFFFFF 0%, #FAF6F0 100%);
}

.cover-book-header {
    font-family: var(--font-headers);
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    color: var(--color-primary);
    text-transform: uppercase;
}

.cover-book-title-container {
    margin: 3rem 0;
}

.cover-book-title {
    font-family: var(--font-body);
    font-size: 2.25rem;
    line-height: 1.3;
    color: var(--color-primary-dark);
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.cover-book-divider {
    width: 80px;
    height: 3px;
    background-color: var(--color-gold);
    margin: 1.5rem auto;
    border-radius: 2px;
}

.cover-book-subtitle {
    font-family: var(--font-headers);
    font-size: 1.1rem;
    color: var(--color-text-muted);
    line-height: 1.6;
    max-width: 480px;
    margin: 0 auto;
    text-align: center;
}

.cover-book-footer {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.cover-book-author {
    font-family: var(--font-body);
    font-size: 1.15rem;
    font-style: italic;
    color: var(--color-primary-dark);
    font-weight: 500;
}

/* Headers */
.chapter-header {
    margin-bottom: 1.75rem;
    font-size: 2rem;
    line-height: 1.3;
}

.chapter-subheader {
    margin-top: 2rem;
    margin-bottom: 1rem;
    font-size: 1.35rem;
    border-bottom: 1px solid var(--color-sand-light);
    padding-bottom: 0.5rem;
}

/* Paragraphs and Lists */
p {
    margin-bottom: 1.5rem;
    text-align: justify;
}

ul {
    margin-left: 1.5rem;
    margin-bottom: 1.5rem;
}

li {
    margin-bottom: 0.5rem;
}

/* Blockquotes */
blockquote {
    background-color: var(--color-sand-light);
    border-left: 4px solid var(--color-primary);
    padding: 1.5rem;
    margin: 2rem 0;
    font-style: italic;
    border-radius: 0 var(--radius-small) var(--radius-small) 0;
}

/* Alerts */
.alert-tip {
    background-color: #F8F5F1;
    border-left: 4px solid var(--color-gold);
    padding: 1.25rem 1.5rem;
    margin: 2rem 0;
    border-radius: 0 var(--radius-small) var(--radius-small) 0;
    font-size: 0.95rem;
}

.alert-important {
    background-color: #F5EAE6;
    border-left: 4px solid #D9886D;
    padding: 1.25rem 1.5rem;
    margin: 2rem 0;
    border-radius: 0 var(--radius-small) var(--radius-small) 0;
    font-size: 0.95rem;
}

/* Interactive Cards & Sheets */
.worksheet-card {
    background: var(--color-card-bg);
    border: 1px solid rgba(42, 90, 96, 0.08);
    border-radius: var(--radius-medium);
    padding: 2.5rem;
    margin: 3rem 0;
    box-shadow: var(--shadow-soft);
    position: relative;
    overflow: hidden;
}

.worksheet-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background-color: var(--color-primary);
}

.worksheet-title {
    font-size: 1.75rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.worksheet-goal {
    font-style: italic;
    color: var(--color-text-muted);
    font-size: 0.95rem;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--color-sand-light);
}

/* Form Styling */
.form-group {
    margin-bottom: 2rem;
}

.form-label {
    display: block;
    font-family: var(--font-headers);
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--color-primary-dark);
}

.form-input-text {
    width: 100%;
    padding: 1rem 1.25rem;
    border: 1px solid var(--color-sand);
    background-color: var(--color-bg-warm);
    border-radius: var(--radius-small);
    font-family: var(--font-body);
    font-size: 1.05rem;
    color: var(--color-text);
    transition: var(--transition-smooth);
    resize: vertical;
}

.form-input-text:focus {
    outline: none;
    border-color: var(--color-primary);
    background-color: #FFFFFF;
    box-shadow: 0 0 0 4px rgba(42, 90, 96, 0.06);
}

/* Checkbox customization */
.checkbox-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.checkbox-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    cursor: pointer;
    user-select: none;
    line-height: 1.5;
}

.checkbox-item input {
    width: 20px;
    height: 20px;
    margin-top: 0.15rem;
    accent-color: var(--color-primary);
    cursor: pointer;
    flex-shrink: 0;
}

/* Grid & Tables in Worksheets */
.worksheet-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
}

.worksheet-table th, 
.worksheet-table td {
    border: 1px solid var(--color-sand);
    padding: 1rem;
    text-align: left;
}

.worksheet-table th {
    background-color: var(--color-sand-light);
    font-family: var(--font-headers);
    font-weight: 600;
    color: var(--color-primary-dark);
}

.worksheet-table textarea {
    width: 100%;
    border: none;
    background: transparent;
    font-family: var(--font-body);
    resize: none;
    font-size: 1rem;
    outline: none;
}

/* 30-day Grid Tracker */
.tracker-grid {
    display: grid;
    grid-template-columns: repeat(10, 1fr);
    gap: 0.5rem;
    margin: 2rem 0;
}

.tracker-day {
    aspect-ratio: 1;
    border: 1px solid var(--color-sand);
    border-radius: var(--radius-small);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-headers);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    background-color: var(--color-bg-warm);
    transition: var(--transition-smooth);
    user-select: none;
}

.tracker-day:hover {
    border-color: var(--color-primary);
    background-color: var(--color-sand-light);
}

.tracker-day.completed {
    background-color: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
    box-shadow: 0 4px 10px rgba(42, 90, 96, 0.15);
}

/* Affirmation Cards */
.affirmation-cards-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin: 2.5rem 0;
}

.affirmation-card {
    border: 2px dashed var(--color-gold);
    padding: 2.25rem 2rem;
    border-radius: var(--radius-medium);
    text-align: center;
    background: linear-gradient(135deg, var(--color-bg-warm) 0%, var(--color-sand-light) 100%);
    box-shadow: var(--shadow-soft);
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 170px;
    position: relative;
    overflow: hidden;
}

.affirmation-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-gold) 100%);
    opacity: 0.7;
    transition: var(--transition-smooth);
}

.affirmation-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-medium);
}

.affirmation-card:hover::before {
    opacity: 1;
    height: 6px;
}

.affirmation-title {
    font-family: var(--font-headers);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-primary-dark);
    margin-bottom: 0.75rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.affirmation-subtitle {
    font-family: var(--font-body);
    font-size: 0.95rem;
    line-height: 1.5;
    color: var(--color-text);
    font-style: italic;
}

/* Custom interactive inputs inside empty cards */
.affirmation-custom-title-input {
    width: 100%;
    border: none;
    border-bottom: 1.5px dashed var(--color-gold);
    background: transparent;
    text-align: center;
    font-family: var(--font-headers);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-primary-dark);
    margin-bottom: 0.75rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    outline: none;
    padding: 0.2rem 0;
    transition: var(--transition-smooth);
}

.affirmation-custom-title-input:focus {
    border-bottom-style: solid;
    border-bottom-color: var(--color-primary);
}

.affirmation-custom-text-textarea {
    width: 100%;
    border: none;
    background: transparent;
    text-align: center;
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--color-text);
    font-style: italic;
    resize: none;
    outline: none;
    height: 60px;
    line-height: 1.5;
    transition: var(--transition-smooth);
    padding: 0;
}

.affirmation-custom-text-textarea::placeholder {
    color: var(--color-text-muted);
    opacity: 0.6;
}

.affirmation-custom-text-textarea:focus::placeholder {
    opacity: 0.3;
}

/* ==========================================================================
   UTILITY ACTIONS (Print & Reset)
   ========================================================================== */
.floating-actions {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    display: flex;
    gap: 1rem;
    z-index: 200;
}

.btn-action {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.85rem 1.5rem;
    border: none;
    border-radius: var(--radius-large);
    font-family: var(--font-headers);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: var(--shadow-medium);
    transition: var(--transition-smooth);
}

.btn-primary {
    background-color: var(--color-primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--color-primary-light);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: var(--color-card-bg);
    color: var(--color-primary-dark);
    border: 1px solid rgba(42, 90, 96, 0.1);
}

.btn-secondary:hover {
    background-color: var(--color-sand-light);
    transform: translateY(-2px);
}

/* ==========================================================================
   PRINT STYLING (@media print)
   ========================================================================== */
@media print {
    @page {
        size: A4;
        margin: 0; /* Hides default Chrome headers (date, time) and footers (link) */
    }

    html, body, .app-container, .main-content {
        height: auto !important;
        min-height: 0 !important;
        overflow: visible !important;
    }

    body {
        background-color: #FFFFFF !important;
        color: #000000 !important;
        font-size: 12pt !important;
        margin: 0 !important;
        padding: 2cm !important; /* Acts as the layout margins for content */
    }
    
    .app-container {
        display: block !important;
    }
    
    .sidebar, .floating-actions, .btn-action, .menu-toggle, .sidebar-backdrop {
        display: none !important;
    }
    
    .main-content {
        margin-left: 0 !important;
        padding: 0 !important;
        max-width: 100% !important;
    }
    
    .section-panel {
        display: none !important;
        opacity: 0 !important;
        animation: none !important;
        transition: none !important;
    }

    .section-panel.active {
        display: block !important;
        opacity: 1 !important;
        transform: none !important;
        animation: none !important;
        transition: none !important;
    }

    /* Print styling for cover page */
    .cover-page-container {
        border: none !important;
        box-shadow: none !important;
        max-width: 100% !important;
        margin: 0 !important;
        min-height: 95vh !important;
        display: flex !important;
    }
    
    .cover-book-spine {
        width: 15px !important;
        background: #2A5A60 !important;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }
    
    .cover-book-content {
        padding: 5cm 2cm !important;
        background: none !important;
    }
    
    .cover-book-header {
        font-size: 11pt !important;
    }
    
    .cover-book-title {
        font-size: 28pt !important;
        margin-bottom: 1cm !important;
    }
    
    .cover-book-subtitle {
        font-size: 14pt !important;
    }
    
    .cover-book-author {
        font-size: 12pt !important;
    }
    
    .cover-book-footer button {
        display: none !important;
    }
    
    .worksheet-card {
        box-shadow: none !important;
        border: 1px solid #CCCCCC !important;
        margin: 2rem 0 !important;
        page-break-inside: avoid !important;
    }
    
    .form-input-text {
        border-bottom: 1px solid #999999 !important;
        border-top: none !important;
        border-left: none !important;
        border-right: none !important;
        border-radius: 0 !important;
        background: transparent !important;
    }
    
    .tracker-day {
        border: 1px solid #999999 !important;
    }
    
    .tracker-day.completed {
        background-color: #CCCCCC !important;
        color: #000000 !important;
    }
    
    .affirmation-card {
        border: 1px dashed #999999 !important;
        page-break-inside: avoid !important;
    }
}

/* Friendly explanation styling */
.worksheet-explanation {
    margin-top: 2.5rem;
    padding: 1.5rem 1.75rem;
    background-color: var(--color-sand-light);
    border-radius: var(--radius-small);
    border-left: 4px solid var(--color-gold);
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--color-text);
}

.worksheet-explanation-title {
    font-family: var(--font-headers);
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--color-primary-dark);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

@media print {
    .worksheet-explanation {
        background-color: #FAFAFA !important;
        border-left: 2pt solid #999999 !important;
        page-break-inside: avoid !important;
    }
}

/* ==========================================================================
   HAMBURGER MENU TOGGLE
   ========================================================================== */
.menu-toggle {
    display: none;
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 300;
    width: 48px;
    height: 48px;
    border: none;
    border-radius: var(--radius-small);
    background-color: var(--color-card-bg);
    box-shadow: 0 2px 12px rgba(42, 90, 96, 0.15);
    cursor: pointer;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 5px;
    padding: 0;
    transition: var(--transition-smooth);
}

.menu-toggle span {
    display: block;
    width: 22px;
    height: 2.5px;
    background-color: var(--color-primary-dark);
    border-radius: 2px;
    transition: transform 0.3s ease, opacity 0.2s ease;
}

/* Animate to X when sidebar is open */
.menu-toggle.is-open span:nth-child(1) {
    transform: translateY(7.5px) rotate(45deg);
}
.menu-toggle.is-open span:nth-child(2) {
    opacity: 0;
}
.menu-toggle.is-open span:nth-child(3) {
    transform: translateY(-7.5px) rotate(-45deg);
}

/* Sidebar backdrop overlay */
.sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.4);
    z-index: 99;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.sidebar-backdrop.is-visible {
    display: block;
    opacity: 1;
}

/* ==========================================================================
   RESPONSIVENESS — Tablet (≤1100px)
   ========================================================================== */
@media (max-width: 1100px) {
    .main-content {
        padding: 2.5rem 2.5rem;
    }
}

/* ==========================================================================
   RESPONSIVENESS — Mobile (≤900px)
   ========================================================================== */
@media (max-width: 900px) {
    /* Show hamburger */
    .menu-toggle {
        display: flex;
    }

    /* Sidebar becomes fixed overlay slide-in */
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        width: 300px;
        height: 100vh;
        transform: translateX(-100%);
        box-shadow: 4px 0 20px rgba(0, 0, 0, 0.15);
        z-index: 200;
        padding: 2rem 1.25rem;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }

    .sidebar.is-open {
        transform: translateX(0);
    }

    /* Main content full width */
    .main-content {
        margin-left: 0;
        padding: 4.5rem 1.5rem 2rem 1.5rem;
        max-width: 100%;
    }

    /* Cover page responsive */
    .cover-page-container {
        max-width: 100%;
        margin: 0 auto;
        min-height: 60vh;
    }

    .cover-book-content {
        padding: 2.5rem 1.5rem;
    }

    .cover-book-title {
        font-size: 1.6rem;
    }

    .cover-book-subtitle {
        font-size: 0.95rem;
    }

    /* Chapter headers */
    .chapter-header {
        font-size: 1.6rem;
    }

    .chapter-subheader {
        font-size: 1.15rem;
    }

    /* Body text */
    body {
        font-size: 16px;
    }

    /* TOC grid — single column on mobile */
    .toc-grid {
        grid-template-columns: 1fr !important;
    }

    /* Worksheet card padding */
    .worksheet-card {
        padding: 1.5rem;
        margin: 2rem 0;
    }

    /* Tables scroll horizontally */
    .worksheet-table {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    /* Tracker grid — 5 columns on mobile */
    .tracker-grid {
        grid-template-columns: repeat(5, 1fr);
    }

    /* Affirmation cards single column */
    .affirmation-cards-container {
        grid-template-columns: 1fr;
    }

    /* Contact form — stack fields */
    .contact-fields-row {
        grid-template-columns: 1fr !important;
    }

    /* Contact action buttons stack */
    .contact-actions-row {
        flex-direction: column !important;
    }

    .contact-actions-row button {
        width: 100%;
    }

    /* Floating action buttons */
    .floating-actions {
        bottom: 1rem;
        right: 1rem;
        gap: 0.5rem;
    }

    .btn-action {
        padding: 0.65rem 1rem;
        font-size: 0.85rem;
    }

    /* Blockquotes & alerts smaller padding */
    blockquote {
        padding: 1rem;
        margin: 1.5rem 0;
    }

    .alert-tip,
    .alert-important {
        padding: 1rem;
        margin: 1.5rem 0;
    }
}

/* ==========================================================================
   RESPONSIVENESS — Small phones (≤480px)
   ========================================================================== */
@media (max-width: 480px) {
    .main-content {
        padding: 4rem 1rem 2rem 1rem;
    }

    .cover-page-container {
        flex-direction: column;
        min-height: auto;
    }

    .cover-book-spine {
        width: 100%;
        height: 8px;
    }

    .cover-book-content {
        padding: 2rem 1.25rem;
    }

    .cover-book-title {
        font-size: 1.35rem;
    }

    .cover-book-header {
        font-size: 0.85rem;
    }

    .chapter-header {
        font-size: 1.35rem;
    }

    .chapter-subheader {
        font-size: 1.05rem;
    }

    .worksheet-card {
        padding: 1.25rem;
    }

    .worksheet-title {
        font-size: 1.35rem;
    }

    /* Tracker grid — still 5 but smaller */
    .tracker-grid {
        gap: 0.35rem;
    }

    .tracker-day {
        font-size: 0.75rem;
    }

    .floating-actions {
        bottom: 0.75rem;
        right: 0.75rem;
    }

    .btn-action {
        padding: 0.55rem 0.85rem;
        font-size: 0.8rem;
    }

    .sidebar {
        width: 280px;
    }

    .form-input-text {
        font-size: 0.95rem;
        padding: 0.85rem 1rem;
    }
}