/* ===================================
   Science Bridge Network - Stylesheet
   =================================== */

/* ===== CSS Variables ===== */
:root {
    /* Color Palette - Science & Nature Inspired */
    --primary-color: #2E7D32;        /* Forest Green */
    --primary-light: #4CAF50;
    --primary-dark: #1B5E20;
    
    --secondary-color: #0277BD;      /* Ocean Blue */
    --secondary-light: #03A9F4;
    --secondary-dark: #01579B;
    
    --accent-color: #F57C00;         /* Warm Orange */
    --accent-light: #FF9800;
    
    --text-dark: #212121;
    --text-light: #757575;
    --text-white: #FFFFFF;
    
    --bg-white: #FFFFFF;
    --bg-light: #F5F5F5;
    --bg-dark: #263238;
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.2);
    
    --transition: all 0.3s ease;
    --transition-fast: all 0.2s ease;
    
    /* Typography */
    --font-primary: 'Inter', sans-serif;
    --font-display: 'Playfair Display', serif;
}

/* ===== Reset & Base Styles ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    color: var(--text-dark);
    line-height: 1.7;
    overflow-x: hidden;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 1rem;
}

h1 {
    font-size: 3rem;
    font-family: var(--font-display);
}

h2 {
    font-size: 2.5rem;
    font-family: var(--font-display);
}

h3 {
    font-size: 1.75rem;
}

h4 {
    font-size: 1.25rem;
}

p {
    margin-bottom: 1rem;
}

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ===== Container ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    text-align: center;
    font-size: 1rem;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--text-white);
    box-shadow: var(--shadow-sm);
}

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

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

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

.btn-small {
    padding: 0.625rem 1.5rem;
    font-size: 0.875rem;
}

/* ===== Navigation ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--bg-white);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo i {
    font-size: 1.75rem;
}

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

.nav-link {
    font-weight: 500;
    color: var(--text-dark);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

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

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    border-radius: 2px;
    transition: var(--transition);
}

/* ===== Hero Section ===== */
.hero {
    height: 100vh;
    min-height: 600px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--secondary-dark) 100%);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('https://images.unsplash.com/photo-1532094349884-543bc11b234d?w=1920') center/cover;
    opacity: 0.2;
    z-index: 1;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(46, 125, 50, 0.8) 0%, rgba(2, 119, 189, 0.8) 100%);
    z-index: 2;
}

.hero-content {
    position: relative;
    z-index: 3;
    text-align: center;
    color: var(--text-white);
}

.hero-title {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    animation: fadeInUp 1s ease;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 2.5rem;
    font-weight: 300;
    animation: fadeInUp 1s ease 0.2s both;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    animation: fadeInUp 1s ease 0.4s both;
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
    animation: bounce 2s infinite;
}

.scroll-indicator i {
    font-size: 2rem;
    color: var(--text-white);
}

/* ===== Section Styles ===== */
.section {
    padding: 6rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-label {
    display: inline-block;
    padding: 0.5rem 1.5rem;
    background: var(--primary-light);
    color: var(--text-white);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 1rem;
}

.section-title {
    color: var(--text-dark);
    margin-bottom: 1rem;
}

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

/* ===== About Section ===== */
.about-section {
    background: var(--bg-light);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.about-text h3 {
    color: var(--primary-color);
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.about-text h3:first-child {
    margin-top: 0;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.stat-card {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 16px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.stat-card i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-light);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ===== Programs Section ===== */
.programs-section {
    background: var(--bg-white);
}

.programs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.program-card {
    background: var(--bg-white);
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid #E0E0E0;
}

.program-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.program-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-light), var(--secondary-light));
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.program-icon i {
    font-size: 2.5rem;
    color: var(--text-white);
}

.program-card h3 {
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.program-card > p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
}

.program-features {
    list-style: none;
}

.program-features li {
    display: flex;
    align-items: start;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
}

.program-features i {
    color: var(--primary-color);
    margin-top: 0.25rem;
}



/* ===== Impact Section ===== */
.impact-section {
    background: var(--bg-light);
}

.impact-grid {
    display: grid;
    gap: 3rem;
}

.impact-story {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    background: var(--bg-white);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.impact-story:hover {
    box-shadow: var(--shadow-md);
}

.impact-story:nth-child(even) {
    direction: rtl;
}

.impact-story:nth-child(even) .impact-content {
    direction: ltr;
}

.impact-image {
    height: 100%;
    overflow: hidden;
}

.impact-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

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

.impact-content {
    padding: 2rem;
}

.impact-content h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.impact-content p {
    color: var(--text-light);
    font-style: italic;
    line-height: 1.8;
}

.impact-author {
    font-weight: 600;
    color: var(--text-dark);
    font-style: normal;
    margin-top: 1rem;
}

/* ===== News Section ===== */
.news-section {
    background: var(--bg-white);
}



.img {
  border-radius: 8px;
  flex: 0 0 auto;
  width: 300px;
  height: auto;
}

.news-grid {
  display: grid;
  grid-template-columns: 1fr 360px; /* gallery column + content column */
  gap: 2rem;
  align-items: start;
}

.news-media {
  overflow: hidden;
}

.gallery-row {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 48px;                     /* larger gap between featured image and gallery items */
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding: 1rem 0;
  scroll-snap-type: x proximity;
  flex-wrap: nowrap;             /* prevent wrapping so items stay on one horizontal line */
}

.gallery-row .gallery {
  display: flex;
  gap: 32px;                     /* larger spacing between gallery items */
  align-items: flex-start;
}

div.gallery {
  display: flex;
  gap: 32px;
  align-items: flex-start;
}

div.gallery-item {
  margin: 0;
  border: 1px solid #ccc;
  flex: 0 0 280px;            
  width: 280px;
  border-radius: 8px;
  background: var(--bg-white);
  box-shadow: var(--shadow-sm);
  scroll-snap-align: center;
}


div.gallery-item:hover {
  border: 1px solid #777;
  box-shadow: var(--shadow-md);
}


div.gallery-item img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 8px 8px 0 0;
}


div.gallery-item div.desc {
  padding: 12px;
  text-align: center;
}

@media only screen and (max-width: 768px) {
  .gallery-row {
    gap: 12px;
  }
  div.gallery-item {
    flex: 0 0 45%;
    width: 45%;
  }
}

@media only screen and (max-width: 480px) {
  .gallery-row {
    flex-direction: column;
    overflow-x: visible;
    align-items: center;
  }
  div.gallery {
    flex-direction: column;
  }
  div.gallery-item {
    flex: 0 0 auto;
    width: 100%;
    margin-bottom: 10px;
  }
}

.news-intro {
    text-align: center;
    font-size: 1.125rem;
    color: var(--text-light);
    max-width: 800px;
    margin: 0 auto 3rem;
}


.news-cta {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--text-white);
    padding: 3rem;
    border-radius: 16px;
    text-align: center;
    margin-top: 3rem;
}

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

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

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

.news-cta .btn:hover {
    background: var(--bg-light);
}




/* ===== Partners Section ===== */
.partners-section {
    background: var(--bg-white);
}

.partners-intro {
    text-align: center;
    font-size: 1.125rem;
    color: var(--text-light);
    max-width: 800px;
    margin: 0 auto 3rem;
}

.partner-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.partner-category {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: 16px;
    text-align: center;
    transition: var(--transition);
}

.partner-category:hover {
    background: var(--primary-color);
    color: var(--text-white);
    transform: translateY(-5px);
}

.partner-category h3 {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.partner-category:hover h3,
.partner-category:hover p {
    color: var(--text-white);
}

.partner-cta {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--text-white);
    padding: 3rem;
    border-radius: 16px;
    text-align: center;
    margin-top: 3rem;
}

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

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

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

.partner-cta .btn:hover {
    background: var(--bg-light);
}

/* ===== Contact Section ===== */
.contact-section {
    background: var(--bg-light);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

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

.contact-details {
    margin: 2rem 0;
}

.contact-item {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.contact-item i {
    font-size: 1.5rem;
    color: var(--primary-color);
    width: 40px;
    height: 40px;
    background: var(--bg-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-item h4 {
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.contact-item a {
    color: var(--primary-color);
    font-weight: 500;
}

.contact-item a:hover {
    color: var(--primary-dark);
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.social-links a {
    width: 45px;
    height: 45px;
    background: var(--primary-color);
    color: var(--text-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
}

/* Contact Form */
.contact-form-wrapper {
    background: var(--bg-white);
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
}

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

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.875rem;
    border: 2px solid #E0E0E0;
    border-radius: 8px;
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: var(--transition);
}

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

.form-group textarea {
    resize: vertical;
}

.form-message {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 8px;
    display: none;
}

.form-message.success {
    display: block;
    background: #C8E6C9;
    color: #2E7D32;
}

.form-message.error {
    display: block;
    background: #FFCDD2;
    color: #C62828;
}

/* ===== Footer ===== */
.footer {
    background: var(--bg-dark);
    color: var(--text-white);
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-about h3 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-white);
    margin-bottom: 1rem;
}

.footer-about p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.8;
}

.footer h4 {
    color: var(--text-white);
    margin-bottom: 1.5rem;
}

.footer ul {
    list-style: none;
}

.footer ul li {
    margin-bottom: 0.75rem;
}

.footer ul li a {
    color: rgba(255, 255, 255, 0.8);
    transition: var(--transition);
}

.footer ul li a:hover {
    color: var(--primary-light);
    padding-left: 5px;
}

.footer-contact p {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 1.5rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
}

.footer-bottom p {
    margin-bottom: 0.5rem;
}

/* ===== Back to Top Button ===== */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: var(--text-white);
    border: none;
    border-radius: 50%;
    font-size: 1.25rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
}

/* ===== Animations ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

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

/* Tablet */
@media (max-width: 968px) {
    html {
        font-size: 15px;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .impact-story {
        grid-template-columns: 1fr;
    }
    
    .impact-story:nth-child(even) {
        direction: ltr;
    }
}

/* Mobile */
@media (max-width: 768px) {
    .container {
        padding: 0 1.5rem;
    }
    
    .section {
        padding: 4rem 0;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        gap: 1rem;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--bg-white);
        flex-direction: column;
        padding: 2rem;
        box-shadow: var(--shadow-lg);
        transition: var(--transition);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .programs-grid {
        grid-template-columns: 1fr;
    }
    
    .partner-categories {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    h1 {
        font-size: 2.5rem;
    }
    
    h2 {
        font-size: 2rem;
    }
    
    h3 {
        font-size: 1.5rem;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.125rem;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
    }
    
    .stat-card {
        padding: 1.5rem;
    }
    
    .contact-form-wrapper {
        padding: 1.5rem;
    }
}