/* ============================================
   TechEventsNow - Global Styles
   Modern, distinctive design with excellent UX
   ============================================ */

:root {
    /* Color System - Bold & Modern */
    --color-primary: #0066ff;
    --color-primary-dark: #0052cc;
    --color-primary-light: #3385ff;
    --color-secondary: #ff4081;
    --color-accent: #00d9ff;
    
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f8fafb;
    --color-bg-tertiary: #f0f4f8;
    
    --color-text-primary: #1a1f36;
    --color-text-secondary: #4a5568;
    --color-text-tertiary: #6b7280;
    
    --color-border: #e1e8ed;
    --color-border-light: #f0f4f8;
    
    --color-success: #00c896;
    --color-warning: #ffb020;
    --color-error: #ff4757;
    
    /* Typography */
    --font-display: 'Manrope', sans-serif;
    --font-body: 'DM Sans', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 20px 48px rgba(0, 0, 0, 0.15);
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   Base Styles
   ============================================ */

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

/* Skip to main content link for accessibility */
.skip-to-main {
    position: absolute;
    left: -9999px;
    z-index: 999;
    padding: var(--spacing-md);
    background-color: var(--color-primary);
    color: white;
    text-decoration: none;
    font-weight: 600;
    border-radius: var(--radius-md);
}

.skip-to-main:focus {
    left: var(--spacing-md);
    top: var(--spacing-md);
}

/* ============================================
   Header
   ============================================ */

header {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    padding: var(--spacing-lg) 0;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
}

.logo {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 800;
    text-decoration: none;
    color: white;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: transform var(--transition-fast);
    letter-spacing: -0.02em;
}

.logo:hover {
    transform: scale(1.02);
}

.logo-icon {
    font-size: 1.5rem;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

nav ul {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
}

nav a {
    color: white;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all var(--transition-fast);
    position: relative;
    padding: var(--spacing-xs) 0;
}

nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: white;
    transition: width var(--transition-base);
}

nav a:hover::after,
nav a[aria-current="page"]::after {
    width: 100%;
}

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

.hero {
    background: linear-gradient(165deg, var(--color-bg-primary) 0%, var(--color-bg-tertiary) 100%);
    padding: var(--spacing-3xl) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 102, 255, 0.08) 0%, transparent 70%);
    border-radius: 50%;
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    50% { transform: translate(-30px, 30px) rotate(180deg); }
}

.hero-content {
    position: relative;
    z-index: 1;
    animation: fadeInUp 0.8s ease-out;
}

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

.hero h1 {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.03em;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-2xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    font-weight: 500;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-3xl);
    flex-wrap: wrap;
    margin-top: var(--spacing-2xl);
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.stat-number {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--color-text-tertiary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ============================================
   Filters Section
   ============================================ */

.filters {
    background: white;
    padding: var(--spacing-2xl) 0;
    border-bottom: 1px solid var(--color-border-light);
    position: sticky;
    top: 73px;
    z-index: 999;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
}

.filter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--spacing-lg);
    align-items: end;
}

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

.filter-group label {
    font-family: var(--font-display);
    font-weight: 700;
    color: var(--color-text-secondary);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.filter-group select,
.filter-group input {
    padding: var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg-primary);
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-primary);
    transition: all var(--transition-base);
    cursor: pointer;
}

.filter-group select:hover,
.filter-group input:hover {
    border-color: var(--color-primary-light);
}

.filter-group select:focus,
.filter-group input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1);
}

.clear-filters {
    background: var(--color-bg-tertiary);
    color: var(--color-text-secondary);
    border: 2px solid transparent;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 0.9rem;
    transition: all var(--transition-base);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.clear-filters:hover {
    background: var(--color-text-primary);
    color: white;
    transform: translateY(-1px);
}

/* ============================================
   Events Section
   ============================================ */

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

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-2xl);
    flex-wrap: wrap;
    gap: var(--spacing-lg);
}

.section-header h2 {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 3vw, 2.25rem);
    color: var(--color-text-primary);
    font-weight: 800;
    letter-spacing: -0.02em;
}

.results-count {
    color: var(--color-text-tertiary);
    font-weight: 600;
    font-size: 0.95rem;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-lg);
}

.events-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: var(--spacing-xl);
}

/* ============================================
   Event Cards
   ============================================ */

.event-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    border: 1px solid var(--color-border-light);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.event-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

.event-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-border);
}

.event-card:hover::before {
    transform: scaleX(1);
}

.event-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
    gap: var(--spacing-md);
}

.event-title {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-text-primary);
    line-height: 1.3;
    letter-spacing: -0.01em;
    flex: 1;
}

.event-type {
    background: linear-gradient(135deg, var(--color-bg-tertiary) 0%, var(--color-border-light) 100%);
    color: var(--color-text-secondary);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-xl);
    font-size: 0.75rem;
    font-weight: 700;
    white-space: nowrap;
    flex-shrink: 0;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.event-provider {
    color: var(--color-primary);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    font-size: 0.9rem;
    font-family: var(--font-display);
}

.event-details {
    display: grid;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.event-detail {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

.event-detail .icon {
    font-size: 1rem;
    flex-shrink: 0;
}

.event-description {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    font-size: 0.95rem;
    flex: 1;
}

.event-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: auto;
}

.event-link {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    text-decoration: none;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    font-weight: 700;
    font-family: var(--font-display);
    transition: all var(--transition-base);
    text-align: center;
    flex: 1;
    font-size: 0.9rem;
    letter-spacing: 0.02em;
}

.event-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 102, 255, 0.35);
}

.event-cost {
    font-family: var(--font-display);
    font-weight: 800;
    color: var(--color-success);
    font-size: 1rem;
    flex-shrink: 0;
}

.event-cost.paid {
    color: var(--color-warning);
}

/* ============================================
   Loading & No Results States
   ============================================ */

.loading, .no-results {
    text-align: center;
    padding: var(--spacing-3xl) var(--spacing-xl);
    color: var(--color-text-tertiary);
}

.loading h3, .no-results h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-secondary);
    font-weight: 700;
}

.spinner {
    display: inline-block;
    width: 48px;
    height: 48px;
    border: 4px solid var(--color-border-light);
    border-top: 4px solid var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-lg);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ============================================
   SEO Content Section
   ============================================ */

.seo-content {
    background: white;
    padding: var(--spacing-3xl) 0;
    margin-top: var(--spacing-3xl);
    border-top: 1px solid var(--color-border-light);
}

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

.content-block {
    background: var(--color-bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-light);
}

.content-block h2 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.content-block h3 {
    font-family: var(--font-display);
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.01em;
}

.content-block p {
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.content-block ul {
    list-style: none;
    padding: 0;
}

.content-block li {
    color: var(--color-text-secondary);
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    position: relative;
}

.content-block li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 700;
}

.content-block a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--transition-fast);
}

.content-block a:hover {
    color: var(--color-primary-dark);
}

.category-list a {
    display: inline;
}

.provider-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.provider-tag {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-xl);
    font-size: 0.85rem;
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-base);
    display: inline-block;
}

.provider-tag:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 102, 255, 0.3);
}

.location-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.location-grid span {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border-light);
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.location-grid span:hover {
    border-color: var(--color-primary-light);
    transform: translateY(-2px);
}

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

footer {
    background: linear-gradient(165deg, #1a1f36 0%, #0f1219 100%);
    color: #a0aec0;
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    margin-top: var(--spacing-3xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-section h3 {
    font-family: var(--font-display);
    margin-bottom: var(--spacing-md);
    color: #f7fafc;
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.footer-section p,
.footer-section li {
    color: #a0aec0;
    margin-bottom: var(--spacing-sm);
    font-size: 0.9rem;
    line-height: 1.6;
}

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

.footer-section a {
    color: #a0aec0;
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    border-top: 1px solid #2d3748;
    padding-top: var(--spacing-xl);
    text-align: center;
    color: #718096;
    font-size: 0.9rem;
}

.footer-bottom a {
    color: #718096;
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

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

@media (max-width: 1024px) {
    .events-grid {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-xl: 1.5rem;
        --spacing-2xl: 2rem;
        --spacing-3xl: 2.5rem;
    }

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

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

    .filters {
        position: relative;
        top: 0;
    }

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

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

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

    .filter-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

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

    .event-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }

    nav ul {
        gap: var(--spacing-lg);
    }

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

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    .logo {
        font-size: 1.4rem;
    }

    .event-card {
        padding: var(--spacing-lg);
    }

    .event-footer {
        flex-direction: column;
        gap: var(--spacing-sm);
        align-items: stretch;
    }

    .event-link {
        width: 100%;
    }

    .event-cost {
        text-align: left;
    }

    nav ul {
        flex-wrap: wrap;
        gap: var(--spacing-md);
        justify-content: center;
    }

    nav a {
        font-size: 0.85rem;
    }

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