/* style.css - Webapp "Il disordine perfetto" */

/* Design Tokens & Variables */
:root {
    --primary-color: #2980b9;       /* Architectural Blue */
    --primary-hover: #3498db;
    --secondary-color: #7f8c8d;     /* Concrete Gray */
    --secondary-hover: #95a5a6;
    --accent-color: #1abc9c;        /* Intellectual Cyan */
    --accent-light: rgba(26, 188, 156, 0.1);
    
    --bg-light: #fdfefe;            /* Pure white canvas */
    --surface-light: #ffffff;
    --text-light-main: #2c3e50;
    --text-light-muted: #7f8c8d;
    --border-light: #eaf2f8;

    --bg-dark: #15111e;             /* Midnight Violet Space */
    --surface-dark: #231c30;        /* Deep Violet Surface */
    --text-dark-main: #f5f6fa;
    --text-dark-muted: #bdc3c7;
    --border-dark: #352c48;

    /* Active variables mapped to light theme by default */
    --bg-color: var(--bg-light);
    --surface-color: var(--surface-light);
    --text-color: var(--text-light-main);
    --text-muted: var(--text-light-muted);
    --border-color: var(--border-light);
    --shadow-color: rgba(142, 68, 173, 0.04);
    --modal-bg: rgba(21, 17, 30, 0.7);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body.dark-theme {
    --bg-color: var(--bg-dark);
    --surface-color: var(--surface-dark);
    --text-color: var(--text-dark-main);
    --text-muted: var(--text-dark-muted);
    --border-color: var(--border-dark);
    --shadow-color: rgba(0, 0, 0, 0.25);
    --modal-bg: rgba(0, 0, 0, 0.85);
}

/* Resets */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: var(--transition);
    overflow-x: hidden;
}

h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.25;
}

h2 {
    font-size: 2.2rem;
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
}

a {
    color: inherit;
    text-decoration: none;
}

p {
    margin-bottom: 1rem;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 4rem 0;
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3.5rem;
    align-items: center;
}

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

/* Header & Navigation */
.main-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 5%;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--surface-color);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    transition: var(--transition);
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-color);
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-muted);
    transition: var(--transition);
}

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

.btn-back-catalog {
    padding: 0.5rem 1rem;
    border: 1.5px solid var(--primary-color);
    border-radius: var(--radius-sm);
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.85rem;
    transition: var(--transition);
}

.btn-back-catalog:hover {
    background-color: var(--primary-color);
    color: #ffffff;
}

/* Theme Toggle */
.theme-toggle {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 3.2rem;
    height: 3.2rem;
    border-radius: 50%;
    border: none;
    background-color: var(--secondary-color);
    color: #ffffff;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(44, 62, 80, 0.3);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.theme-toggle:hover {
    transform: scale(1.1) rotate(15deg);
    background-color: var(--secondary-hover);
}

body.dark-theme .theme-toggle {
    background-color: var(--primary-color);
    box-shadow: 0 4px 15px rgba(142, 68, 173, 0.4);
}

body.dark-theme .theme-toggle:hover {
    background-color: var(--primary-hover);
}

.theme-toggle svg {
    position: absolute;
    transition: var(--transition);
}

.sun-icon {
    opacity: 0;
    transform: scale(0.5);
    stroke: #ffffff;
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.moon-icon {
    opacity: 1;
    transform: scale(1);
    fill: #ffffff;
}

body.dark-theme .sun-icon {
    opacity: 1;
    transform: scale(1);
}

body.dark-theme .moon-icon {
    opacity: 0;
    transform: scale(0.5);
}

/* Buttons */
.btn-primary, .btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.85rem 1.8rem;
    font-family: inherit;
    font-weight: 600;
    font-size: 0.95rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(142, 68, 173, 0.25);
}

.btn-secondary {
    background-color: var(--accent-light);
    color: var(--text-color);
    border: 1.5px solid var(--border-color);
}

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

.download-icon {
    stroke: currentColor;
    fill: none;
    stroke-width: 2.5;
    stroke-linecap: round;
    stroke-linejoin: round;
}

/* Hero Section */
.hero {
    background: radial-gradient(circle at 80% 20%, rgba(142, 68, 173, 0.06) 0%, rgba(0,0,0,0) 65%);
    padding: 4rem 5%;
    overflow: hidden;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 4rem;
    align-items: center;
}

.hero-badge {
    display: inline-block;
    background-color: rgba(142, 68, 173, 0.1);
    color: var(--primary-color);
    padding: 0.35rem 1rem;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 1.5rem;
}

.hero-content h1 {
    font-size: 3.5rem;
    letter-spacing: -1.5px;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.hero-content .subtitle {
    font-size: 1.4rem;
    color: var(--text-muted);
    font-family: 'Merriweather', serif;
    font-style: italic;
    margin-bottom: 1.5rem;
    line-height: 1.4;
}

.hero-author {
    font-size: 1rem;
    color: var(--text-color);
    margin-bottom: 2rem;
}

.hero-intro {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Cover Image Mockup styling */
.hero-visual-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
}

.book-cover-container {
    width: 280px;
    height: 410px;
    border-radius: var(--radius-md);
    box-shadow: 0 15px 35px var(--shadow-color), 0 3px 10px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    position: relative;
    transition: var(--transition);
    transform: perspective(1000px) rotateY(-10deg) rotateX(5deg);
}

.book-cover-container:hover {
    transform: perspective(1000px) rotateY(0deg) rotateX(0deg) scale(1.02);
}

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

.book-cover-mockup {
    width: 100%;
    height: 100%;
    background-color: #231c30;
    color: #ffffff;
    padding: 1.5rem;
    position: relative;
}

.cover-inner {
    border: 1px solid rgba(255,255,255,0.15);
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 1rem;
    position: relative;
    z-index: 2;
}

.cover-series {
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--accent-color);
    text-align: center;
}

.cover-title {
    font-size: 1.3rem;
    font-weight: 800;
    text-align: center;
    color: #ffffff;
    line-height: 1.25;
    margin-top: 1rem;
}

.cover-subtitle {
    font-size: 0.7rem;
    text-align: center;
    color: var(--text-dark-muted);
    font-style: italic;
    margin-top: 0.2rem;
}

.cover-author {
    font-size: 0.85rem;
    text-align: center;
    color: var(--accent-color);
    font-weight: 600;
    margin-top: 0.8rem;
}

.cover-geometry {
    display: flex;
    justify-content: center;
    margin: 1.5rem 0;
}

.suitcase-svg {
    width: 110px;
    height: 110px;
    filter: drop-shadow(0 4px 10px rgba(0, 0, 0, 0.3));
}

.cover-edition {
    font-size: 0.55rem;
    text-align: center;
    color: rgba(255,255,255,0.5);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Author Box */
.section-author-box {
    background-color: var(--surface-color);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.author-summary-box {
    max-width: 900px;
    margin: 0 auto;
    padding: 2.5rem 0;
    display: flex;
    gap: 2rem;
    align-items: center;
}

.box-icon {
    background-color: rgba(142, 68, 173, 0.1);
    color: var(--primary-color);
    width: 65px;
    height: 65px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.box-text h3 {
    font-size: 1.25rem;
    margin-bottom: 0.4rem;
    color: var(--primary-color);
}

.box-text p {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-bottom: 0;
}

.biography-section {
    background-color: var(--bg-color);
}

.author-photo-wrapper {
    display: flex;
    justify-content: center;
}

.author-photo-img {
    width: 280px;
    height: 330px;
    object-fit: cover;
    border-radius: var(--radius-md);
    box-shadow: 0 10px 25px var(--shadow-color);
}

.author-fallback-svg {
    width: 280px;
    height: 330px;
}

.biography-content h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background-color: var(--primary-color);
    margin-top: 0.5rem;
}

/* Importance Grid */
.importance-section {
    background-color: var(--surface-color);
}

.importance-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2.5rem;
    margin-top: 3.5rem;
}

.importance-card {
    background-color: var(--bg-color);
    padding: 2.5rem 2rem;
    border-radius: var(--radius-md);
    box-shadow: 0 8px 20px var(--shadow-color);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.importance-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 30px var(--shadow-color);
    border-color: var(--primary-color);
}

.card-icon {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.importance-card h3 {
    font-size: 1.3rem;
    margin-bottom: 0.8rem;
    color: var(--text-color);
}

.importance-card p {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-bottom: 0;
}

/* Timeline Journey */
.journey-section {
    background-color: var(--bg-color);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.section-desc {
    color: var(--text-muted);
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0.5rem auto 3rem auto;
}

.journey-path-container {
    position: relative;
    max-width: 900px;
    margin: 4rem auto;
    padding: 2rem 0;
}

.journey-progress-line {
    position: absolute;
    top: 50%;
    left: 0;
    width: 100%;
    height: 4px;
    background-color: var(--border-color);
    transform: translateY(-50%);
    z-index: 1;
}

.journey-progress-fill {
    height: 100%;
    width: 0%;
    background-color: var(--primary-color);
    transition: width 0.5s ease;
}

.journey-nodes {
    display: flex;
    justify-content: space-between;
    position: relative;
    z-index: 2;
}

.journey-node {
    background-color: var(--surface-color);
    border: 3px solid var(--border-color);
    width: 3.5rem;
    height: 3.5rem;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    position: relative;
}

.node-number {
    font-weight: 800;
    font-size: 1.2rem;
    color: var(--text-muted);
}

.node-title {
    position: absolute;
    top: 4.5rem;
    width: 130px;
    text-align: center;
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-muted);
    transform: translateX(-50%);
    left: 50%;
    pointer-events: none;
    line-height: 1.2;
}

.journey-node.active {
    border-color: var(--primary-color);
    background-color: var(--surface-color);
}

.journey-node.active .node-number {
    color: var(--primary-color);
}

.journey-node.active .node-title {
    color: var(--text-color);
}

.journey-node:hover {
    transform: scale(1.15);
    border-color: var(--primary-color);
    box-shadow: 0 4px 15px rgba(142, 68, 173, 0.25);
}

/* Modals */
.journey-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--modal-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    z-index: 1000;
    backdrop-filter: blur(5px);
}

.journey-modal-overlay.open {
    opacity: 1;
    pointer-events: auto;
}

.journey-modal-wrapper {
    background-color: var(--surface-color);
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
    position: relative;
    overflow-y: auto;
    transform: scale(0.9);
    transition: transform 0.3s ease;
    border: 1px solid var(--border-color);
}

.journey-modal-overlay.open .journey-modal-wrapper {
    transform: scale(1);
}

.journey-modal-close {
    position: absolute;
    top: 1.2rem;
    right: 1.2rem;
    font-size: 2rem;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    z-index: 10;
    transition: var(--transition);
}

.journey-modal-close:hover {
    color: var(--primary-color);
}

.journey-modal-container {
    padding: 2.5rem;
}

.modal-eyebrow {
    color: var(--primary-color);
    font-weight: 700;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 0.5rem;
    display: block;
}

.journey-modal-container h2 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

.journey-modal-visual {
    background-color: var(--bg-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    display: flex;
    justify-content: center;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
}

.journey-modal-visual svg {
    max-height: 120px;
    width: 100%;
}

.modal-body-text {
    font-size: 1.05rem;
    color: var(--text-color);
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.modal-sub-block {
    margin-bottom: 1.2rem;
    padding-left: 1rem;
    border-left: 3px solid var(--primary-color);
}

.modal-sub-block h4 {
    font-size: 0.95rem;
    color: var(--text-color);
    margin-bottom: 0.2rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.modal-sub-block p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 0;
}

.modal-interaction-box {
    background-color: rgba(142, 68, 173, 0.06);
    border: 1px dashed var(--primary-color);
    border-radius: var(--radius-md);
    padding: 1.2rem;
    margin: 1.5rem 0;
}

.modal-interaction-box h4 {
    color: var(--primary-color);
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.modal-interaction-box p {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.8rem;
}

.modal-btn-action {
    background-color: var(--primary-color);
    color: #ffffff;
    padding: 0.5rem 1rem;
    font-weight: 600;
    font-size: 0.85rem;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

/* Simulator Canvas & Panels */
.labs-divider {
    border-top: 1px solid var(--border-color);
    background-color: var(--surface-color);
    padding: 4rem 0 0 0;
}

.divider-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    display: inline-block;
}

.interactive-section-1 {
    background-color: var(--surface-color);
    padding-bottom: 4rem;
}

.trial-simulator-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3.5rem;
    align-items: center;
    background-color: var(--bg-color);
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 30px var(--shadow-color);
    border: 1px solid var(--border-color);
}

.canvas-container-wrapper {
    background-color: #120d1a;
    border-radius: var(--radius-md);
    padding: 10px;
    box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    border: 1px solid var(--primary-color);
}

.canvas-box {
    width: 100%;
    position: relative;
    cursor: crosshair;
}

#symmetry-canvas {
    display: block;
    width: 100%;
    height: auto;
    background-color: #15111e;
    border-radius: 4px;
}

.simulator-controls {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.simulator-controls h3 {
    font-size: 1.4rem;
    color: var(--primary-color);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.control-group label {
    font-weight: 600;
    font-size: 0.95rem;
}

.control-select {
    width: 100%;
    padding: 0.8rem;
    border-radius: var(--radius-sm);
    border: 1.5px solid var(--border-color);
    background-color: var(--surface-color);
    color: var(--text-color);
    font-family: inherit;
    font-size: 0.95rem;
    outline: none;
    transition: var(--transition);
}

.control-select:focus {
    border-color: var(--primary-color);
}

input[type="range"] {
    width: 100%;
    accent-color: var(--primary-color);
}

.status-box {
    background-color: var(--surface-color);
    border-left: 4px solid var(--primary-color);
    padding: 1.2rem;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-size: 0.95rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.02);
}

.trial-results-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.result-tile {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.result-tile span {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.result-tile strong {
    font-size: 1.1rem;
}

.result-tile.full-width {
    grid-column: 1 / -1;
}

.btn-group-row {
    display: flex;
    gap: 1rem;
}

.btn-group-row button {
    flex: 1;
}

/* Key Concepts */
.concepts-section {
    background-color: var(--bg-color);
    border-top: 1px solid var(--border-color);
}

.concepts-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-top: 3rem;
}

.concept-card {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    cursor: pointer;
    transition: var(--transition);
}

.concept-card:hover {
    box-shadow: 0 8px 25px var(--shadow-color);
    border-color: var(--primary-color);
}

.concept-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.concept-header h3 {
    font-size: 1.2rem;
    color: var(--text-color);
}

.concept-toggle-icon {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    transition: var(--transition);
}

.concept-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
}

.concept-card.expanded .concept-content {
    max-height: 500px;
    margin-top: 1.2rem;
    transition: max-height 0.5s ease-in-out;
}

.concept-def, .concept-ex, .concept-rel {
    font-size: 0.9rem;
    margin-bottom: 0.8rem;
}

.concept-ex {
    color: var(--primary-color);
    font-style: italic;
}

/* Narrative */
.narrative-section {
    background-color: var(--surface-color);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.narrative-content {
    max-width: 800px;
    margin: 0 auto;
}

.narrative-content h2 {
    font-size: 2.2rem;
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

.narrative-content p {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    color: var(--text-muted);
}

blockquote {
    font-family: 'Merriweather', serif;
    font-style: italic;
    font-size: 1.25rem;
    color: var(--primary-color);
    border-left: 4px solid var(--primary-color);
    padding-left: 1.5rem;
    margin: 2rem 0;
    line-height: 1.5;
}

/* Quiz Section */
.quiz-section {
    background-color: var(--bg-color);
}

.quiz-container {
    max-width: 700px;
    margin: 3rem auto 0 auto;
    background-color: var(--surface-color);
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 30px var(--shadow-color);
    padding: 3rem;
    border: 1px solid var(--border-color);
}

.quiz-progress {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 1rem;
}

.quiz-card h3 {
    font-size: 1.35rem;
    margin-bottom: 2rem;
    line-height: 1.4;
}

.text-left-btn {
    text-align: left;
    display: block;
    width: 100%;
    padding: 1.2rem;
    margin-bottom: 0.8rem;
}

.quiz-feedback-card {
    padding: 1.5rem;
    border-radius: var(--radius-md);
    margin-top: 1.5rem;
}

.feedback-header {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    margin-bottom: 1rem;
}

.feedback-icon {
    font-size: 1.8rem;
}

.feedback-header h3 {
    margin-bottom: 0;
    font-size: 1.2rem;
}

#quiz-fb-text {
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
}

/* Takeaways */
.takeaways-section {
    background-color: var(--surface-color);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.takeaways-list {
    max-width: 800px;
    margin: 3.5rem auto 0 auto;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.takeaway-item {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
}

.takeaway-num {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--primary-color);
    line-height: 1;
}

.takeaway-text h4 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.takeaway-text p {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-bottom: 0;
}

/* Recommended Audience */
.audience-section {
    background-color: var(--bg-color);
}

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

.audience-card {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 2rem;
}

.audience-card h4 {
    color: var(--primary-color);
    font-size: 1.15rem;
    margin-bottom: 0.8rem;
}

.audience-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 0;
}

/* Relevance Today */
.relevance-section {
    background-color: var(--surface-color);
    border-top: 1px solid var(--border-color);
}

.relevance-lead {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 800px;
    margin: 1.5rem auto 0 auto;
    line-height: 1.7;
}

/* Call to Action */
.cta-section {
    background: linear-gradient(135deg, var(--secondary-color) 0%, #1a1917 100%);
    color: #ffffff;
    text-align: center;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.cta-section h2 {
    color: #ffffff;
    font-size: 2.2rem;
}

.cta-section p {
    color: var(--text-dark-muted);
    font-size: 1.1rem;
    margin: 1rem auto 2.5rem auto;
    max-width: 600px;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.cta-buttons .btn-secondary {
    background-color: rgba(255,255,255,0.06);
    color: #ffffff;
    border-color: rgba(255,255,255,0.15);
}

.cta-buttons .btn-secondary:hover {
    background-color: rgba(255,255,255,0.15);
}

/* Footer styling */
.site-footer {
    background-color: #15111e;
    color: #bdc3c7;
    padding: 3rem 0;
    text-align: center;
    font-size: 0.9rem;
    border-top: 1px solid #352c48;
}

.site-footer p {
    max-width: 700px;
    margin: 0 auto;
}

.site-footer a {
    color: var(--accent-color);
    font-weight: 600;
    transition: var(--transition);
}

.site-footer a:hover {
    color: #ffffff;
    text-decoration: underline;
}

/* Responsive constraints */
@media (max-width: 968px) {
    .grid-2, .hero-container, .trial-simulator-layout {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }

    .hero {
        text-align: center;
        padding: 3rem 1.5rem;
    }

    .hero-badge {
        margin: 0 auto 1.5rem auto;
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }

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

    .book-cover-container {
        transform: none;
    }

    .book-cover-container:hover {
        transform: scale(1.02);
    }

    .author-summary-box {
        flex-direction: column;
        text-align: center;
        padding: 2.5rem 1.5rem;
    }

    .importance-grid, .concepts-grid, .audience-grid {
        grid-template-columns: 1fr;
    }

    .journey-nodes {
        flex-direction: column;
        gap: 4rem;
        align-items: center;
    }

    .journey-progress-line {
        left: 50%;
        top: 0;
        width: 4px;
        height: 100%;
        transform: translateX(-50%);
    }

    .node-title {
        left: 4.5rem;
        top: 50%;
        transform: translateY(-50%);
        text-align: left;
    }
}