/* ====================================
   RESEARCHERS NETWORK - MAIN STYLES
   Based on EU Neighbours East design
   ==================================== */

/* ============ RESET & BASE ============ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* White Theme with Green Accent - matching euneighbourseast.eu */
    --primary-color: #00d573;
    --primary-hover: #00bf67;
    --accent-color: #00ff88;
    --black: #1a1a1a;
    --white: #ffffff;
    --gray-50: #fafafa;
    --gray-100: #f5f5f5;
    --gray-200: #e0e0e0;
    --gray-300: #d1d1d1;
    --gray-400: #9e9e9e;
    --gray-500: #757575;
    --gray-600: #616161;
    --gray-700: #424242;
    --gray-800: #212529;
    --text-primary: #1a1a1a;
    --text-secondary: #616161;
    --border-color: #e0e0e0;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;

    /* Layout */
    --max-width: 1400px;
    --sidebar-width: 280px;
    --header-height: 140px;

    /* Effects */
    --transition: all 0.3s ease;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
}

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

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: #ffffff;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============ HEADER ============ */
.header {
    background-color: #ffffff;
    border-bottom: 1px solid #e0e0e0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.header-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
}

/* Logo */
.logo {
    flex-shrink: 0;
}

.logo-text {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--black);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.logo-highlight {
    color: #00d573;
}

/* Main Navigation */
.main-nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex: 1;
    display: flex;
    justify-content: center;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
    margin: 0;
    padding: 0;
}

.nav-link {
    color: #1a1a1a;
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: 600;
    letter-spacing: 0.5px;
    padding: var(--spacing-xs) var(--spacing-sm);
    transition: var(--transition);
    position: relative;
}

.nav-link:hover {
    color: #00d573;
}

.nav-link.active {
    color: #00d573;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    right: 0;
    height: 3px;
    background-color: #00d573;
}

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-shrink: 0;
}

.hashtag-buttons {
    display: flex;
    gap: var(--spacing-sm);
}

.hashtag-btn {
    display: inline-flex;
    align-items: center;
    padding: 6px 12px;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: var(--font-size-xs);
    font-weight: 500;
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
    background-color: var(--white);
}

.hashtag-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background-color: rgba(0, 213, 115, 0.05);
}

.language-selector {
    position: relative;
}

.language-select {
    padding: 8px 32px 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-primary);
    background-color: var(--white);
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%231a1a1a' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    transition: var(--transition);
}

.language-select:hover,
.language-select:focus {
    border-color: var(--primary-color);
}

.mobile-menu-toggle {
    display: none;
}

@media (max-width: 767px) {
    /* Hide desktop navigation */
    .main-nav {
        display: none !important;
    }

    /* Show mobile menu toggle */
    .mobile-menu-toggle {
        display: flex !important;
        flex-direction: column;
        gap: 5px;
        background: none;
        border: none;
        cursor: pointer;
        padding: 10px;
        position: relative;
        z-index: 1002;
        pointer-events: auto;
    }

    .mobile-menu-toggle span {
        display: block;
        width: 28px;
        height: 3px;
        background-color: #1a1a1a;
        border-radius: 2px;
        transition: all 0.3s ease;
    }

    /* Mobile navigation active state */
    .main-nav.active {
        display: flex !important;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: #ffffff;
        border-top: 1px solid #e0e0e0;
        box-shadow: 0 4px 12px rgba(0,0,0,0.15);
        padding: 0;
        z-index: 1000;
    }

    .main-nav.active .nav-list {
        flex-direction: column !important;
        gap: 0 !important;
        padding: 0 !important;
        list-style: none !important;
        margin: 0;
        width: 100%;
    }

    .main-nav.active .nav-item {
        width: 100%;
    }

    .main-nav.active .nav-link,
    .main-nav.active a {
        display: block !important;
        padding: 16px 20px !important;
        color: #1a1a1a !important;
        border-bottom: 1px solid #f0f0f0 !important;
        font-size: 16px !important;
        width: 100%;
        text-decoration: none;
    }

    .main-nav.active .nav-link:hover,
    .main-nav.active a:hover {
        background-color: #f5f5f5 !important;
        color: #00d573 !important;
    }
}

/* Social Links */
.social-links {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-lg);
    display: flex;
    gap: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.social-link {
    color: var(--text-secondary);
    font-size: var(--font-size-lg);
    transition: var(--transition);
}

.social-link:hover {
    color: var(--primary-color);
}

/* Icon placeholders (use Font Awesome or similar in production) */
.social-link::before {
    content: '◉';
    font-size: 20px;
}

/* ============ MAIN CONTENT ============ */
.main-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
    background-color: #ffffff;
}

.content-wrapper {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    gap: var(--spacing-xl);
    align-items: start;
}

/* ============ SIDEBAR ============ */
.sidebar {
    position: sticky;
    top: calc(var(--header-height) + var(--spacing-md));
    background-color: #ffffff;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.search-box {
    position: relative;
    margin-bottom: var(--spacing-xl);
}

.search-input {
    width: 100%;
    padding: 12px 40px 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-family: var(--font-primary);
    color: var(--text-primary);
    transition: var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 213, 115, 0.1);
}

.search-input::placeholder {
    color: var(--gray-400);
}

.search-btn {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    color: var(--gray-500);
    padding: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.search-btn:hover {
    color: var(--primary-color);
}

/* Filter Sections */
.filter-section {
    margin-bottom: var(--spacing-xl);
}

.filter-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--black);
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.5px;
}

.filter-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.filter-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    user-select: none;
}

.filter-checkbox {
    width: 18px;
    height: 18px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    appearance: none;
    position: relative;
}

.filter-checkbox:checked {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.filter-checkbox:checked::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--white);
    font-size: 12px;
    font-weight: bold;
}

.filter-checkbox:hover {
    border-color: var(--primary-color);
}

.filter-label {
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    cursor: pointer;
}

.sort-select {
    width: 100%;
    padding: 12px 40px 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-family: var(--font-primary);
    color: var(--text-primary);
    background-color: var(--white);
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%231a1a1a' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    transition: var(--transition);
}

.sort-select:hover,
.sort-select:focus {
    border-color: var(--primary-color);
    outline: none;
}

/* ============ RESEARCHERS SECTION ============ */
.researchers-section {
    min-height: 600px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--black);
    letter-spacing: -1px;
}

.results-info {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* Researchers Grid */
.researchers-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

/* Loading State */
.loading {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xxl) 0;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--gray-200);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.loading p {
    margin-top: var(--spacing-md);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

/* ============ FOOTER ============ */
.footer {
    background: #1a1a1a;
    color: var(--white);
    padding: 60px 40px 30px;
    margin-top: 0;
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section {
    display: block;
}

.footer-section h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.footer-section p {
    color: #ccc;
    font-size: 14px;
    line-height: 1.8;
}

.footer-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--white);
    margin-bottom: var(--spacing-sm);
}

.footer-text {
    font-size: var(--font-size-sm);
    color: var(--gray-300);
    line-height: 1.7;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: #ccc;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s ease;
}

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

.footer-social {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-social-link {
    color: var(--gray-300);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: var(--transition);
}

.footer-social-link:hover {
    color: var(--primary-color);
}

.footer-bottom {
    border-top: 1px solid #333;
    padding-top: 30px;
    text-align: center;
    color: #999;
    font-size: 14px;
}

.footer-bottom p {
    color: #999;
    font-size: 14px;
}

.footer-copyright {
    font-size: var(--font-size-sm);
    color: var(--gray-400);
}

/* ============ UTILITIES ============ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 24px;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    font-family: var(--font-primary);
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--white);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

/* Support for direct nav links (without nav-list) */
.main-nav > a {
    color: #1a1a1a;
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: 600;
    letter-spacing: 0.5px;
    padding: var(--spacing-xs) var(--spacing-sm);
    transition: var(--transition);
    position: relative;
    display: inline-block;
    margin: 0 var(--spacing-sm);
}

.main-nav > a:hover {
    color: #00d573;
}

.main-nav > a.active {
    color: #00d573;
}

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