/* ===================================
   LK Strategy Publishing LLC Styles
   Brand Colors: Blue (38, 132, 181), Green (113, 172, 54)
   =================================== */

:root {
    --brand-blue: rgb(38, 132, 181);
    --brand-green: rgb(113, 172, 54);
    --brand-blue-dark: rgb(28, 102, 151);
    --brand-green-dark: rgb(93, 142, 44);
    --text-primary: #1a1a1a;
    --text-secondary: #4a4a4a;
    --text-light: #6a6a6a;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --border-color: #e0e0e0;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===================================
   Typography
   =================================== */

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 {
    font-size: 3rem;
}

h2 {
    font-size: 2.5rem;
}

h3 {
    font-size: 1.75rem;
}

h4 {
    font-size: 1.25rem;
}

p {
    margin-bottom: 1rem;
}

a {
    text-decoration: none;
    color: var(--brand-blue);
    transition: color 0.3s ease;
}

a:hover {
    color: var(--brand-blue-dark);
}

/* ===================================
   Header & Navigation
   =================================== */

.header {
    background-color: var(--bg-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo {
    height: 50px;
    width: auto;
}

.brand-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 1rem;
    padding: 0.5rem 0;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--brand-green);
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    border-radius: 3px;
    transition: all 0.3s ease;
}

/* ===================================
   Buttons
   =================================== */

.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    text-decoration: none;
}

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

.btn-primary:hover {
    background-color: var(--brand-blue-dark);
    color: var(--bg-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: transparent;
    color: var(--brand-blue);
    border: 2px solid var(--brand-blue);
}

.btn-secondary:hover {
    background-color: var(--brand-blue);
    color: var(--bg-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ===================================
   Hero Section
   =================================== */

.hero {
    background: linear-gradient(135deg, rgba(38, 132, 181, 0.7) 0%, rgba(28, 102, 151, 0.7) 100%), 
                url('../images/hero-banner.jpg') center center / cover no-repeat;
    color: var(--bg-white);
    padding: 6rem 0;
    text-align: center;
    position: relative;
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    font-weight: 800;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    font-weight: 500;
    opacity: 0.95;
}

.hero-description {
    font-size: 1.125rem;
    line-height: 1.8;
    margin-bottom: 2.5rem;
    opacity: 0.9;
}

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

/* ===================================
   Sections
   =================================== */

section {
    padding: 5rem 0;
}

.section-title {
    text-align: center;
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-size: 2.75rem;
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.25rem;
    margin-bottom: 3rem;
    font-weight: 500;
}

.section-description {
    text-align: center;
    color: var(--text-light);
    font-size: 1.125rem;
    max-width: 700px;
    margin: 0 auto 2rem;
}

/* ===================================
   About Section
   =================================== */

.about {
    background-color: var(--bg-light);
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

.about-content p {
    margin-bottom: 1.5rem;
}

/* ===================================
   Approach Section
   =================================== */

.approach-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.approach-card {
    background-color: var(--bg-white);
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    border-top: 4px solid var(--brand-green);
}

.approach-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.approach-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.approach-card h3 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.approach-card p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 0;
}

/* ===================================
   Authors Section
   =================================== */

.authors {
    background-color: var(--bg-light);
}

.subsection-title {
    text-align: center;
    color: var(--brand-blue);
    margin-bottom: 2rem;
    font-size: 1.75rem;
}

.authors-content {
    max-width: 1000px;
    margin: 0 auto 4rem;
}

.authors-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.author-type {
    background-color: var(--bg-white);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    border-left: 4px solid var(--brand-green);
}

.author-type h4 {
    color: var(--brand-blue);
    margin-bottom: 0.75rem;
}

.author-type p {
    color: var(--text-secondary);
    margin-bottom: 0;
}

.publishing-process {
    background-color: var(--bg-white);
    padding: 3rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.publishing-process h3 {
    color: var(--text-primary);
    text-align: center;
    margin-bottom: 2rem;
    font-size: 2rem;
}

.process-steps {
    list-style: none;
    counter-reset: step-counter;
}

.process-steps li {
    counter-increment: step-counter;
    position: relative;
    padding-left: 4rem;
    margin-bottom: 2rem;
}

.process-steps li::before {
    content: counter(step-counter);
    position: absolute;
    left: 0;
    top: 0;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--brand-blue), var(--brand-green));
    color: var(--bg-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.5rem;
}

.process-steps li strong {
    display: block;
    color: var(--text-primary);
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.process-steps li p {
    color: var(--text-secondary);
    margin-bottom: 0;
}

.cta-section {
    text-align: center;
    background: linear-gradient(135deg, var(--brand-blue), var(--brand-green));
    color: var(--bg-white);
    padding: 3rem;
    border-radius: 12px;
    margin-top: 3rem;
}

.cta-section h3 {
    color: var(--bg-white);
    margin-bottom: 1rem;
}

.cta-section p {
    font-size: 1.125rem;
    margin-bottom: 2rem;
    opacity: 0.95;
}

.cta-section .btn-primary {
    background-color: var(--bg-white);
    color: var(--brand-blue);
}

.cta-section .btn-primary:hover {
    background-color: var(--bg-light);
    color: var(--brand-blue-dark);
}

/* ===================================
   Titles Section
   =================================== */

.titles {
    background-color: var(--bg-white);
}

.book-showcase {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 4rem;
    max-width: 1100px;
    margin: 3rem auto 0;
    align-items: center;
}

.book-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.book-image img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    transition: transform 0.3s ease;
}

.book-image img:hover {
    transform: scale(1.05);
}

.book-description {
    text-align: left;
}

.book-description p {
    font-size: 1.25rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 0;
}

.book-description em {
    color: var(--brand-blue);
    font-style: italic;
    font-weight: 600;
}

/* ===================================
   Contact Section
   =================================== */

.contact {
    background-color: var(--bg-light);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    max-width: 1000px;
    margin: 0 auto;
}

.contact-content-centered {
    max-width: 700px;
    margin: 0 auto;
}

.contact-content-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    max-width: 1000px;
    margin: 0 auto;
    align-items: center;
}

.contact-info h3 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    text-align: left;
}

.contact-info p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    text-align: left;
}

.contact-details {
    background-color: var(--bg-white);
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.contact-item {
    margin-bottom: 2rem;
}

.contact-item:last-child {
    margin-bottom: 0;
}

.contact-item strong {
    display: block;
    color: var(--brand-blue);
    margin-bottom: 0.75rem;
    font-size: 1.125rem;
}

.contact-item p,
.contact-item a {
    color: var(--text-secondary);
    margin-bottom: 0;
    line-height: 1.8;
}

.contact-logo {
    display: flex;
    justify-content: center;
    align-items: center;
}

.contact-logo img {
    max-width: 350px;
    width: 100%;
    height: auto;
}

.contact-form {
    background-color: var(--bg-white);
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.875rem;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--brand-blue);
}

.form-group textarea {
    resize: vertical;
}

.contact-form .btn {
    width: 100%;
}

/* ===================================
   Footer
   =================================== */

.footer {
    background-color: var(--text-primary);
    color: var(--bg-white);
    padding: 3rem 0 1.5rem;
}

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

.footer-brand {
    max-width: 400px;
}

.footer-logo {
    height: 80px;
    width: auto;
    margin-bottom: 1rem;
}

.footer-tagline {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 0;
}

.footer-links {
    display: flex;
    gap: 4rem;
}

.footer-column h4 {
    color: var(--bg-white);
    margin-bottom: 1rem;
    font-size: 1.125rem;
}

.footer-column ul {
    list-style: none;
}

.footer-column ul li {
    margin-bottom: 0.5rem;
}

.footer-column a {
    color: rgba(255, 255, 255, 0.8);
    transition: color 0.3s ease;
}

.footer-column a:hover {
    color: var(--brand-green);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 1.5rem;
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 0;
    font-size: 0.875rem;
}

/* ===================================
   Responsive Design
   =================================== */

@media (max-width: 968px) {
    .nav-menu {
        display: none;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.25rem;
    }

    .section-title {
        font-size: 2.25rem;
    }

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

    .contact-content-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

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

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

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

    .footer-links {
        gap: 2rem;
    }
}

@media (max-width: 768px) {
    .hero {
        padding: 4rem 0;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.125rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }

    section {
        padding: 3rem 0;
    }

    .section-title {
        font-size: 2rem;
    }

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

    .authors-list {
        grid-template-columns: 1fr;
    }

    .publishing-process {
        padding: 2rem;
    }

    .process-steps li {
        padding-left: 3.5rem;
    }

    .process-steps li::before {
        width: 40px;
        height: 40px;
        font-size: 1.25rem;
    }

    .footer-links {
        flex-direction: column;
        gap: 1.5rem;
    }
}

@media (max-width: 480px) {
    .brand-name {
        font-size: 1rem;
    }

    .logo {
        height: 40px;
    }

    .hero-title {
        font-size: 1.75rem;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .btn {
        padding: 0.75rem 1.5rem;
    }

    .contact-form {
        padding: 1.5rem;
    }
}