/* 
   Flood Safety Guidance Website
   Custom CSS for a clean, calm, and human-designed feel.
   Blue tones, light gray backgrounds, white sections.
*/

:root {
    --primary-blue: #004d99;
    --secondary-blue: #3385ff;
    --light-blue: #e6f2ff;
    --dark-blue: #003366;
    --white: #ffffff;
    --light-gray: #f8f9fa;
    --medium-gray: #e9ecef;
    --dark-gray: #343a40;
    --text-color: #212529;
    --transition: all 0.3s ease;
    --container-width: 1200px;
    --header-height: 80px;
    --border-radius: 8px;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white);
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

h1, h2, h3, h4 {
    color: var(--dark-blue);
    font-weight: 700;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* --- Header & Navigation --- */
header {
    background-color: var(--white);
    height: var(--header-height);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav {
    height: 100%;
    display: flex;
    align-items: center;
}

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

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

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    font-weight: 500;
    font-size: 1rem;
    color: var(--dark-gray);
}

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

.mobile-menu-toggle {
    display: none;
    cursor: pointer;
    flex-direction: column;
    gap: 6px;
}

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

/* --- Hero Section --- */
.hero {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--light-blue) 0%, #ffffff 100%);
    position: relative;
    overflow: hidden;
}

.hero-content {
    max-width: 600px;
}

.hero h1 {
    font-size: 3rem;
    line-height: 1.2;
    margin-bottom: 20px;
}

.hero p {
    font-size: 1.25rem;
    color: var(--dark-gray);
    margin-bottom: 30px;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    font-weight: 600;
    border-radius: var(--border-radius);
    cursor: pointer;
}

.btn.primary {
    background-color: var(--primary-blue);
    color: var(--white);
    border: 2px solid var(--primary-blue);
}

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

/* --- Sections Common --- */
section {
    padding: 80px 0;
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 10px;
}

.section-subtitle {
    font-size: 1.1rem;
    text-align: center;
    color: var(--dark-gray);
    margin-bottom: 50px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* --- Intro Section --- */
.intro {
    background-color: var(--white);
}

.intro-grid {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.intro h2 {
    margin-bottom: 20px;
}

/* --- Chapters Section --- */
.chapters-section {
    background-color: var(--light-gray);
}

.chapters-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
}

.chapter-card {
    background-color: var(--white);
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.chapter-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.chapter-card .chapter-number {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--secondary-blue);
    text-transform: uppercase;
    margin-bottom: 10px;
}

.chapter-card h3 {
    font-size: 1.25rem;
    margin-bottom: 15px;
}

.chapter-card p {
    font-size: 0.95rem;
    color: var(--dark-gray);
    margin-bottom: 20px;
    flex-grow: 1;
}

.chapter-card .read-more {
    font-weight: 600;
    color: var(--primary-blue);
    display: flex;
    align-items: center;
    gap: 5px;
    cursor: pointer;
}

.chapter-card .read-more:hover {
    gap: 10px;
}

/* --- Safety Methods Section --- */
.methods-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 30px;
}

.method-card {
    background-color: var(--white);
    padding: 30px;
    border-radius: var(--border-radius);
    border: 1px solid var(--medium-gray);
    text-align: center;
    transition: var(--transition);
}

.method-card:hover {
    border-color: var(--secondary-blue);
    background-color: var(--light-blue);
}

.method-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.method-card h3 {
    font-size: 1.1rem;
    margin-bottom: 15px;
}

.method-card p {
    font-size: 0.9rem;
}

/* --- About Section --- */
.about-section {
    background-color: var(--primary-blue);
    color: var(--white);
    text-align: center;
}

.about-section h2 {
    color: var(--white);
    margin-bottom: 20px;
}

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

/* --- Footer --- */
footer {
    background-color: var(--dark-blue);
    color: var(--white);
    padding: 60px 0 20px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-info .logo {
    color: var(--white);
    margin-bottom: 20px;
}

.footer-links h4, .footer-contact h4 {
    margin-bottom: 20px;
    color: var(--secondary-blue);
}

.footer-links ul li {
    margin-bottom: 10px;
}

.footer-links a:hover {
    color: var(--secondary-blue);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
    text-align: center;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
}

/* --- Modal --- */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.5);
    padding: 20px;
    backdrop-filter: blur(5px);
}

.modal-content {
    background-color: var(--white);
    margin: 5% auto;
    padding: 40px;
    border-radius: var(--border-radius);
    max-width: 800px;
    position: relative;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from { transform: translateY(-30px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.close-modal {
    position: absolute;
    right: 25px;
    top: 20px;
    font-size: 2rem;
    font-weight: 700;
    cursor: pointer;
    color: var(--dark-gray);
}

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

#modal-body h2 {
    margin-bottom: 20px;
    font-size: 2rem;
}

#modal-body .chapter-meta {
    color: var(--secondary-blue);
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: 10px;
    display: block;
}

#modal-body p {
    margin-bottom: 20px;
    font-size: 1.1rem;
}

#modal-body img {
    width: 100%;
    max-height: 400px;
    object-fit: cover;
    border-radius: var(--border-radius);
    margin-bottom: 30px;
    background-color: var(--medium-gray);
}

#modal-body h4 {
    margin: 30px 0 15px;
}

#modal-body ul {
    margin-bottom: 20px;
    list-style: disc;
    padding-left: 20px;
}

#modal-body li {
    margin-bottom: 10px;
}

/* --- Responsive --- */
@media (max-width: 992px) {
    .hero h1 {
        font-size: 2.5rem;
    }
}

@media (max-width: 768px) {
    header {
        height: 70px;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background-color: var(--white);
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
        gap: 20px;
        text-align: center;
    }

    .nav-links.active {
        display: flex;
    }

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

    .hero {
        padding: 60px 0;
        text-align: center;
    }

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

    .hero h1 {
        font-size: 2rem;
    }

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

    .modal-content {
        padding: 30px 20px;
    }
}