/* ============================================
   HERA-ME Website - Professional CSS Design
   Enhanced for readability, spacing, and mobile
   ============================================ */

:root {
    --primary-dark: #1e3a8a;
    --primary-blue: #2563eb;
    --accent-green: #22c55e;
    --accent-light-green: #86efac;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --text-lighter: #9ca3af;
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 24px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.1);
    --font-display: 'Poppins', sans-serif;
    --font-body: 'Lato', sans-serif;
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1.25rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4.5rem;
    --spacing-3xl: 6rem;
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    color: var(--text-dark);
    line-height: 1.6;
    background-color: var(--bg-white);
    overflow-x: hidden;
}

.container {
    max-width: 1300px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: var(--spacing-lg);
    color: var(--primary-dark);
    letter-spacing: -0.5px;
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    line-height: 1.15;
    font-weight: 800;
    margin-bottom: var(--spacing-md);
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    position: relative;
    display: inline-block;
    margin-bottom: var(--spacing-2xl);
}

h2::after {
    content: '';
    position: absolute;
    bottom: -12px;
    left: 0;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-green), var(--primary-blue));
    border-radius: 2px;
}

h3 {
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
    margin-bottom: var(--spacing-md);
}

h4 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

p {
    margin-bottom: var(--spacing-md);
    color: var(--text-light);
    line-height: 1.75;
    font-size: 1rem;
    font-weight: 300;
}

p strong {
    color: var(--text-dark);
    font-weight: 600;
}

a {
    color: var(--primary-blue);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
}

a:hover {
    color: var(--accent-green);
}

/* ============================================
   NAVIGATION
   ============================================ */

.navbar {
    background: var(--bg-white);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-dark);
    transition: var(--transition);
}

.logo img {
    height: 40px;
    width: auto;
}

.logo:hover {
    color: var(--accent-green);
    transform: scale(1.05);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-menu a {
    color: var(--text-dark);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
    padding: var(--spacing-xs) 0;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-green);
    transition: width 0.3s ease;
}

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

.dropdown {
    position: relative;
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--bg-white);
    list-style: none;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    min-width: 200px;
    margin-top: var(--spacing-sm);
    overflow: hidden;
    z-index: 1001;
}

.dropdown:hover .dropdown-menu {
    display: flex;
    flex-direction: column;
}

.dropdown-menu li {
    padding: 0;
}

.dropdown-menu a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-dark);
    border-left: 3px solid transparent;
    transition: var(--transition);
}

.dropdown-menu a:hover {
    background: var(--bg-light);
    border-left-color: var(--accent-green);
    padding-left: calc(var(--spacing-md) + 4px);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--primary-dark);
    margin: 5px 0;
    border-radius: 3px;
    transition: var(--transition);
}

.cta-btn {
    background: linear-gradient(135deg, var(--accent-green), #16a34a);
    color: white !important;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 6px;
    font-weight: 600;
    display: inline-block;
    transition: var(--transition);
}

.cta-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: white !important;
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-blue) 100%);
    color: white;
    padding: var(--spacing-3xl) 0;
    position: relative;
    overflow: hidden;
    min-height: 500px;
    display: flex;
    align-items: center;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(34, 197, 94, 0.15) 0%, transparent 70%);
    border-radius: 50%;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -50%;
    left: -5%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(34, 197, 94, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: var(--spacing-3xl);
    position: relative;
    z-index: 2;
}

.hero-text h1 {
    color: white;
    font-size: clamp(2.5rem, 6vw, 4rem);
    margin-bottom: var(--spacing-lg);
    line-height: 1.15;
}

.hero-text p {
    color: rgba(255, 255, 255, 0.95);
    font-size: clamp(1rem, 2vw, 1.25rem);
    margin-bottom: var(--spacing-lg);
    font-weight: 300;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    animation: slideInUp 0.8s ease-out 0.4s both;
    flex-wrap: wrap;
}

.hero-image {
    position: relative;
    height: 400px;
    animation: slideInRight 0.8s ease-out;
}

.gradient-circle {
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 30% 30%, var(--accent-green), transparent),
                radial-gradient(circle at 70% 70%, var(--primary-blue), transparent);
    border-radius: 50%;
    filter: blur(40px);
    animation: pulse 6s ease-in-out infinite;
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: 8px;
    font-weight: 600;
    text-align: center;
    transition: var(--transition);
    border: 2px solid transparent;
    cursor: pointer;
    text-decoration: none;
    font-family: var(--font-display);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-green), #16a34a);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    color: white;
}

.btn-secondary {
    background: transparent;
    color: white;
    border-color: white;
}

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

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.125rem;
}

/* ============================================
   SECTIONS & SPACING
   ============================================ */

section {
    scroll-margin-top: 80px;
}

.impact-metrics {
    background: var(--bg-light);
    padding: var(--spacing-3xl) 0;
}

.impact-metrics h2 {
    text-align: center;
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.metric-card {
    background: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border-top: 4px solid var(--accent-green);
}

.metric-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.metric-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-blue);
    font-family: var(--font-display);
    line-height: 1;
    margin-bottom: var(--spacing-sm);
}

.metric-label {
    font-size: 1rem;
    color: var(--primary-dark);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

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

/* ============================================
   FEATURED PROJECTS
   ============================================ */

.featured-projects {
    padding: var(--spacing-3xl) 0;
}

.featured-projects h2 {
    text-align: center;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.project-card {
    background: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border-left: 5px solid var(--accent-green);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, var(--accent-green), transparent);
    opacity: 0.1;
    border-radius: 50%;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.project-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    line-height: 1;
}

.project-card h3 {
    color: var(--primary-dark);
    margin-bottom: var(--spacing-sm);
    font-size: 1.25rem;
}

.project-card p {
    color: var(--text-light);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-sm);
    flex-grow: 1;
}

.project-card strong {
    color: var(--text-dark);
}

.project-link {
    color: var(--accent-green);
    font-weight: 600;
    display: inline-block;
    margin-top: auto;
}

.project-link:hover {
    transform: translateX(4px);
}

.view-all {
    text-align: center;
    margin-top: var(--spacing-xl);
}

/* ============================================
   NEWS SECTION
   ============================================ */

.latest-news {
    background: var(--bg-light);
    padding: var(--spacing-3xl) 0;
}

.latest-news h2 {
    text-align: center;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.news-card {
    background: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border-top: 4px solid var(--primary-blue);
    display: flex;
    flex-direction: column;
}

.news-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.news-date {
    display: inline-block;
    background: linear-gradient(135deg, var(--accent-green), #16a34a);
    color: white;
    padding: 0.35rem 0.85rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    width: fit-content;
}

.news-card h3 {
    color: var(--primary-dark);
    margin-bottom: var(--spacing-sm);
    font-size: 1.125rem;
}

.news-card p {
    color: var(--text-light);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-md);
    flex-grow: 1;
}

.news-link {
    color: var(--primary-blue);
    font-weight: 600;
    transition: var(--transition);
}

.news-link:hover {
    color: var(--accent-green);
}

/* ============================================
   PUBLICATIONS
   ============================================ */

.latest-publications {
    padding: var(--spacing-3xl) 0;
}

.latest-publications h2 {
    text-align: center;
}

.section-intro {
    text-align: center;
    color: var(--text-light);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-2xl) !important;
}

.publications-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.publication-item {
    background: var(--bg-light);
    padding: var(--spacing-lg);
    border-radius: 12px;
    border-left: 5px solid var(--accent-green);
    transition: var(--transition);
}

.publication-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(4px);
}

.pub-meta {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.pub-year {
    background: var(--primary-blue);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
}

.pub-journal {
    color: var(--text-light);
    font-size: 0.9rem;
    font-style: italic;
}

.publication-item h4 {
    color: var(--primary-dark);
    margin-bottom: var(--spacing-sm);
    font-size: 1.125rem;
}

.publication-item p {
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
}

/* ============================================
   SOCIAL FEED
   ============================================ */

.social-feed {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-blue));
    color: white;
    padding: var(--spacing-3xl) 0;
    position: relative;
    overflow: hidden;
}

.social-feed h2 {
    color: white;
    text-align: center;
}

.social-feed h2::after {
    background: linear-gradient(90deg, var(--accent-light-green), white);
}

.social-feed .section-intro {
    color: rgba(255, 255, 255, 0.9);
}

.social-links-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.social-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    padding: var(--spacing-xl);
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 12px;
    color: white;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.social-btn:hover {
    background: var(--accent-green);
    border-color: var(--accent-green);
    transform: translateY(-4px);
    color: white;
}

.social-icon-large {
    font-size: 2.5rem;
    line-height: 1;
}

/* ============================================
   CTA SECTION
   ============================================ */

.cta-section {
    background: linear-gradient(135deg, var(--accent-green), #16a34a);
    padding: var(--spacing-3xl) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 400px;
    height: 400px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
}

.cta-content {
    position: relative;
    z-index: 2;
}

.cta-content h2 {
    color: white;
}

.cta-content h2::after {
    background: white;
    left: 50%;
    transform: translateX(-50%);
}

.cta-content p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.125rem;
}

.btn-primary.btn-large {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-blue));
    margin-top: var(--spacing-lg);
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
    background: var(--primary-dark);
    color: white;
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section h4 {
    color: white;
    margin-bottom: var(--spacing-md);
}

.footer-section p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-sm);
}

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

.footer-section ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-section a {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--accent-green);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-icon {
    display: inline-block;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    text-align: center;
    line-height: 40px;
    transition: var(--transition);
    font-weight: 600;
    font-size: 1.25rem;
}

.social-icon:hover {
    background: var(--accent-green);
    transform: translateY(-3px);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding-top: var(--spacing-lg);
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

/* ============================================
   ANIMATIONS
   ============================================ */

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

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

/* ============================================
   RESPONSIVE DESIGN - TABLET
   ============================================ */

@media (max-width: 1024px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    .hero .container {
        gap: var(--spacing-2xl);
    }

    h1 {
        font-size: clamp(1.75rem, 4vw, 2.75rem);
    }

    h2 {
        font-size: clamp(1.5rem, 3.5vw, 2rem);
    }
}

/* ============================================
   RESPONSIVE DESIGN - MOBILE
   ============================================ */

@media (max-width: 768px) {
    :root {
        --spacing-lg: 1.5rem;
        --spacing-xl: 2rem;
        --spacing-2xl: 3rem;
        --spacing-3xl: 4rem;
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--bg-white);
        flex-direction: column;
        gap: 0;
        box-shadow: var(--shadow-lg);
        z-index: 999;
    }

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

    .nav-menu li {
        padding: var(--spacing-md) var(--spacing-lg);
        border-bottom: 1px solid var(--border-color);
    }

    .nav-toggle {
        display: flex;
    }

    .hero {
        padding: var(--spacing-2xl) 0;
        min-height: auto;
    }

    .hero .container {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .hero-text h1 {
        font-size: clamp(1.75rem, 5vw, 2.5rem);
    }

    .hero-text p {
        font-size: clamp(0.95rem, 2vw, 1.1rem);
    }

    .hero-image {
        height: 250px;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .metrics-grid,
    .projects-grid,
    .news-grid,
    .social-links-section {
        grid-template-columns: 1fr;
    }

    .dropdown-menu {
        position: relative;
        display: flex !important;
        box-shadow: none;
        background: var(--bg-light);
        margin: 0;
        flex-direction: column;
    }

    .dropdown-menu a {
        padding: var(--spacing-sm) var(--spacing-lg) var(--spacing-sm) calc(var(--spacing-lg) + 20px);
    }

    h2 {
        font-size: clamp(1.25rem, 3vw, 1.75rem);
    }

    .metric-card {
        padding: var(--spacing-md);
    }

    .project-card,
    .news-card {
        padding: var(--spacing-md);
    }

    .publication-item {
        padding: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-lg: 1.25rem;
        --spacing-xl: 1.5rem;
        --spacing-2xl: 2rem;
        --spacing-3xl: 2.5rem;
    }

    .container {
        padding: 0 var(--spacing-md);
    }

    h1 {
        font-size: clamp(1.5rem, 4vw, 2rem);
    }

    h2 {
        font-size: clamp(1.25rem, 3vw, 1.5rem);
    }

    p {
        font-size: 0.95rem;
    }

    .hero-buttons {
        gap: var(--spacing-sm);
    }

    .btn {
        width: 100%;
    }

    .metric-number {
        font-size: 2rem;
    }

    .project-card p,
    .news-card p {
        font-size: 0.9rem;
    }

    .social-links-section {
        gap: var(--spacing-md);
    }

    .social-btn {
        padding: var(--spacing-lg);
    }
}

/* ============================================
   PAGE SECTION
   ============================================ */

.page-section {
    padding: var(--spacing-3xl) 0;
}