:root {
    --primary-color: #007b8c;
    --secondary-color: #ffa100;
    --dark-color: #333;
    --light-color: #fff;
    --bg-light: #f8f9fa;
    --font-family: 'Tajawal', sans-serif;
    --box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    --border-radius: 8px;
    --container-pad: clamp(12px, 3.5vw, 24px);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: 80px; }
html, body { max-width: 100%; overflow-x: hidden; }

body {
    font-family: var(--font-family);
    line-height: 1.7;
    color: var(--dark-color);
    background-color: var(--light-color);
    text-align: start;
}

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

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding-inline-start: max(var(--container-pad), env(safe-area-inset-left));
    padding-inline-end: max(var(--container-pad), env(safe-area-inset-right));
}

h1, h2, h3 { line-height: 1.3; font-weight: 900; color: var(--primary-color); }
h1 { font-size: clamp(2.2rem, 5vw, 45px); margin-bottom: 1rem; }

h2 {
    font-size: 30px;
    text-align: center;
    margin-bottom: 2.5rem;
    position: relative;
}
h2::after {
    content: "";
    display: block;
    width: 60px;
    height: 4px;
    background: var(--secondary-color);
    margin: 15px auto 0;
    border-radius: 2px;
}

p { font-size: 16px; margin-bottom: 1rem; }

.subtitle { font-size: 20px; font-weight: 400; color: #555; margin-bottom: 1.5rem; }
.description { font-size: 16px; color: #444; }

a { color: var(--primary-color); text-decoration: none; transition: color 0.3s ease; }
a:hover { color: var(--secondary-color); }

.btn {
    display: inline-block;
    padding: 12px 28px;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease, background-color 0.3s ease, color 0.3s ease;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    max-width: 100%;
}
.btn-lg { padding: 15px 35px; font-size: 18px; }
.btn-primary { background-color: var(--secondary-color); color: var(--light-color); }
.btn-primary:hover { background-color: #e69100; color: var(--light-color); transform: translateY(-3px); box-shadow: 0 7px 15px rgba(0,0,0,0.15); }
.btn-secondary { background-color: transparent; color: var(--primary-color); border: 2px solid var(--primary-color); }
.btn-secondary:hover { background-color: var(--primary-color); color: var(--light-color); }
.cta-buttons { display: flex; gap: 1rem; flex-wrap: wrap; margin-top: 2rem; width: 100%; }
.btn i { margin-inline-end: 8px; }

.sticky-bar {
    position: fixed;
    top: 0; right: 0; left: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 10px 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transform: translateY(-120%);
    transition: transform 0.4s ease-in-out;
}
.sticky-bar.active { transform: translateY(0); }
.sticky-bar-content { display: flex; justify-content: space-between; align-items: center; gap: 1rem; }
.sticky-book-info { display: flex; align-items: center; gap: 15px; font-weight: 700; color: var(--dark-color); }
.sticky-book-cover { height: 50px; width: auto; border-radius: 2px; box-shadow: 0 2px 5px rgba(0,0,0,0.1); }

.hero {
    padding: 6rem 0;
    background: var(--bg-light);
    min-height: 90vh;
    display: flex;
    align-items: center;
    overflow: hidden;
}
.hero-content { display: flex; align-items: center; justify-content: space-between; gap: clamp(1.25rem, 4vw, 3rem); }
.hero-text { flex: 1.2; min-width: 0; }
.hero-image { flex: 0.8; display: flex; justify-content: center; }
.hero-image img {
  max-width: 100%;
  height: auto;
  filter: drop-shadow(0 10px 15px rgba(0,0,0,0.3));
  transform: rotate(3deg);
  transition: transform 0.5s ease, filter 0.5s ease;
  will-change: transform, filter;
}
.hero-image:hover img { transform: rotate(0deg) scale(1.05); filter: drop-shadow(0 15px 25px rgba(0,0,0,0.45)); }

.page-nav { background-color: var(--primary-color); padding: 1rem 0; box-shadow: var(--box-shadow); }
.page-nav .container { display: flex; justify-content: center; align-items: center; gap: 2rem; flex-wrap: wrap; }
.page-nav a { color: rgba(255,255,255,0.8); font-weight: 700; padding: 0.5rem; border-bottom: 2px solid transparent; }
.page-nav a:hover, .page-nav a:focus { color: var(--light-color); border-bottom-color: var(--secondary-color); }

.content-section { padding: 40px 0 40px; }
.content-section .container { max-width: 800px; }
.bg-light { background-color: var(--light-color); }

details { margin-bottom: 2rem; border-radius: var(--border-radius); overflow: hidden; }
summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.5rem;
    background: #eaeaea;
    cursor: pointer;
    font-weight: 700;
    list-style: none;
    position: relative;
    transition: background-color 0.3s ease;
}
summary:hover { background-color: #f6f6f6; }
details[open] summary { background-color: #f6f6f6; }
summary h2 { color: var(--primary-color); text-align: right; margin: 0; font-size: 14px; padding-inline-end: 20px; }
summary h2::after { display: none; }
summary i.fa-chevron-down { transition: transform 0.3s ease; font-size: 18px; color: var(--secondary-color); }
details[open] summary i.fa-chevron-down { transform: rotate(180deg); }
details p { padding: 1.5rem; padding-top: 0; margin-top: 0; }

.benefits-list {
    list-style: none;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
    width: 100%;
}
.benefits-list li { font-size: 16px; display: flex; align-items: flex-start; gap: 10px; }

.toc-columns { column-count: 2; column-gap: 2rem; padding-bottom: 20px; }

.toc-list {
    list-style-type: square;
    list-style-position: outside;
    padding-inline-start: 40px;
    margin: 0;
}
.toc-list > li { margin-bottom: 0.75rem; font-size: 16px; }
.toc-list :is(ul, ol) { padding-inline-start: 1.25rem; }
.toc-list :is(ul, ol) :is(ul, ol) { padding-inline-start: 1.5rem; }
.toc-list :is(ul, ol) :is(ul, ol) :is(ul, ol) { padding-inline-start: 1.75rem; }
.toc-list ol { list-style-type: circle; }
.toc-list ol ol { list-style-type: none; }
.toc-list ol ol li::before { content: "〉"; margin-inline-end: 0.5rem; color: #333; vertical-align: middle; }
.toc-list ol ol ol { list-style-type: none; }
.toc-list ol ol ol li::before { content: "〉〉"; margin-inline-end: 0.5rem; color: #333; vertical-align: middle; }

.toc-full {
    list-style-position: outside;
    padding-inline-start: 40px;
    background: #f6f6f6;
}

.toc-cta { text-align: center; margin-top: 3rem; padding-top: 2rem; border-top: 1px solid #ddd; }
.toc-cta p { font-size: 1.2rem; font-weight: 700; }

.intro-full {
    list-style-position: outside;
    padding-inline-start: 40px;
    background: #f6f6f6;
}
.intro-full h3 { color: #6a6a6a; padding-bottom: 15px; }

.chapter-full {
    list-style-position: outside;
    padding-bottom: 20px;
    padding-inline-start: 15px;
    padding-inline-end: 40px;
    background: #f6f6f6;
}
.chapter-full h3, .chapter-full h4 { color: #6a6a6a; padding-bottom: 15px; }
.chapter-full ul { list-style: disc; }
.chapter-full ol { list-style: decimal; }
.chapter-full li { padding-inline-start: 0; }

.author-content { display: flex; align-items: center; gap: 3rem; }
.author-img { width: 150px; height: 150px; border-radius: 50%; object-fit: cover; box-shadow: 0 0 0 5px var(--light-color), var(--box-shadow); }
.author-bio { flex: 1; min-width: 0; }
.author-social { margin-top: 1rem; display: flex; gap: 1rem; flex-wrap: wrap; justify-content: center; }
.author-social a { font-size: 1.5rem; color: var(--primary-color); }

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 2rem;
    width: 100%;
}
.review-card {
    background: var(--light-color);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    display: flex;
    flex-direction: column;
    min-width: 0;
}
.review-card blockquote { border: none; padding: 0; margin: 0; flex-grow: 1; }
.review-card blockquote p { font-style: italic; color: #555; }
.review-card figcaption { margin-top: 1.5rem; font-weight: 700; color: var(--dark-color); text-align: start; }
.review-card .stars { color: var(--secondary-color); margin-bottom: 0.5rem; }

.final-cta-section { background: var(--primary-color); color: var(--light-color); text-align: center; padding-top: 80px; padding-bottom: 80px; }
.final-cta-section h2 { color: var(--light-color); }
.final-cta-section h2::after { background: var(--light-color); }
.final-cta-section .btn-primary { background-color: var(--secondary-color); color: var(--light-color); transform: scale(1.1); }

.site-footer { background: var(--dark-color); color: #aaa; padding: 2rem 0; text-align: center; }
.site-footer a { color: #ccc; }
.site-footer a:hover { color: var(--secondary-color); }
.site-footer p { margin: 0; }

.fade-in-up {
    opacity: 0.01;
    transform: translateY(40px);
    transition: opacity 0.8s cubic-bezier(0.65, 0.05, 0.36, 1), transform 0.8s cubic-bezier(0.65, 0.05, 0.36, 1);
}
.fade-in-up.is-visible { opacity: 1; transform: translateY(0); }
.hero-text > * { transition-delay: 0.2s; }
.hero-text .subtitle { transition-delay: 0.4s; }
.hero-text .description { transition-delay: 0.6s; }
.hero-text .cta-buttons { transition-delay: 0.8s; }
.hero-image { transition-delay: 0.5s; }
.page-nav { transition-delay: 1s; }

ul, ol { margin-bottom: 1rem; padding-inline-start: 20px; list-style-position: outside; }
ul { list-style-type: disc; }
ol { list-style-type: decimal; }
ul li, ol li { margin-bottom: 0.5rem; font-size: 16px; color: var(--dark-color); }
ul ul, ol ul, ul ol, ol ol { margin-top: 0.5rem; margin-bottom: 0; padding-inline-start: 1.25rem; }
.benefits-list .fas.fa-check-circle { color: var(--primary-color); }

.list-subtle { list-style: none; padding-inline-start: 0; }
.list-subtle li { position: relative; padding-inline-start: 20px; }
.list-subtle li::before {
    content: "•";
    color: var(--primary-color);
    font-weight: 900;
    font-size: 1.5rem;
    position: absolute;
    top: 50%;
    inset-inline-start: 0;
    transform: translateY(-50%);
}

#toc.content-section { padding: 80px 0 0; }
#introduction.content-section { padding: 0 0 0; }
#chapter-one.content-section { padding: 0 0 0; }
#toc h3 { font-size: 14px; }

pre, code { direction: ltr; text-align: left; font-size: 18px; }
pre {
    overflow-x: auto;
    word-wrap: break-word;
    overflow-wrap: anywhere;
    white-space: pre-wrap;
    margin-bottom: 10px;
    background: #e7e9eb;
}

.chapter-full p { padding-bottom: 10px; margin-bottom: 0; }

.chapter-full figure img { max-width: 100%; height: auto; }
.chapter-full figcaption { text-align: center; padding-bottom: 10px; }

#collapseFloatingBtn {
    font-family: tajawal;
    font-size: 16px;
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 1000;
    padding: 10px 15px;
    background-color: #ffa100;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    display: none;
}

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

@media (max-width: 992px) {
    .hero-content { flex-direction: column; text-align: center; }
    .hero-text { order: 2; }
    .hero-image { order: 1; margin-bottom: 2rem; }
    .hero-image img { max-width: 250px; }
    .cta-buttons { justify-content: center; }
    .author-content { flex-direction: column; text-align: center; }
}

@media (max-width: 768px) {
    .toc-columns { column-count: 1; }
}

@media (max-width: 560px) {
    .final-cta-section .btn-primary { transform: none; }
}

@media (max-width: 480px) {
    .cta-buttons { flex-direction: column; align-items: stretch; }
    .page-nav .container { gap: 0.5rem 1rem; }
    .hero-image img { transform: none; }
    pre, code { font-size: 16px; }
}
/* ==============================
   Footer
============================== */
#footer {
    background-color: #333;
    color: #ddd;
    padding: 50px 0;
    font-family: Arial, sans-serif;
    direction: rtl;
    text-align: center;
}
#footer .container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 15px;
}
#footer .row {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    text-align: center;
}
#footer .footer-col {
    flex: 1 1 33%;
    padding: 20px;
    box-sizing: border-box;
}
#footer .social-links {
    list-style: none;
    padding: 0;
    margin: 0 0 20px;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
}
#footer .social-links a {
    background-color: #555;
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    text-decoration: none;
    transition: background 0.3s, transform 0.2s, color 0.3s;
}
#footer .social-links a:hover {
    transform: scale(1.2);
}
#footer .footer-nav {
    list-style: none;
    padding: 0;
    margin: 0 auto 20px;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    font-size: 15px;
    gap: 10px;
}
#footer .footer-nav li {
    position: relative;
    padding: 0 10px;
}
#footer .footer-nav li:not(:last-child)::after {
    content: "|";
    position: absolute;
    left: -10px;
    top: 50%;
    transform: translateY(-50%);
    color: #666;
}
#footer .footer-nav a {
    color: #ccc;
    text-decoration: none;
    transition: color 0.3s ease;
}
#footer .footer-nav a:hover {
    color: #ffa100;
}
#footer .contact-info {
    font-size: 14px;
    line-height: 1.5;
}
#footer .contact-info a {
    color: #ffa100;
    text-decoration: none;
}
#footer .contact-info a:hover {
    text-decoration: underline;
}
#footer .footer-bottom {
    border-top: 1px solid #555;
    margin-top: 30px;
    padding-top: 20px;
    font-size: 14px;
    color: #aaa;
}
@media (max-width: 768px) {
    #footer .row {
        flex-direction: column;
    }
    #footer .footer-col {
        flex: 1 1 100%;
        padding: 20px 0;
    }
    #footer .footer-nav {
        border-top: 1px solid #333;
        border-bottom: 1px solid #333;
        padding: 10px 0;
        margin: 10px 0;
    }
}