/* ============================================
   OPC Alliance — Shared Styles
   Professional Dark Theme
   ============================================ */

/* ---- CSS Variables ---- */
:root {
    --primary: #A51C30;
    --primary-light: #D1334A;
    --primary-glow: rgba(165, 28, 48, 0.15);
    --dark: #0f172a;
    --darker: #020617;
    --light: #f8fafc;
    --gray: #64748b;
    --border: #1e293b;
    --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans SC', sans-serif;
    --radius: 10px;
    --radius-lg: 16px;
    --transition: 0.2s ease;
}

/* ---- Reset ---- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-body);
    background: var(--darker);
    color: var(--light);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

/* ---- Container ---- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ---- OPC Ecosystem Floating Navigation ---- */
.opc-nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    background: rgba(2, 6, 23, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(30, 41, 59, 0.6);
    height: 60px;
    transition: all 0.3s ease;
}
.opc-nav.scrolled {
    background: rgba(2, 6, 23, 0.98);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}
.opc-nav .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}
.opc-nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--light);
    font-weight: 700;
    font-size: 1rem;
}
.opc-nav-brand svg { flex-shrink: 0; }
.opc-nav-brand span {
    background: linear-gradient(135deg, var(--primary-light), #fff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.opc-nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
}
.opc-nav-links a {
    color: var(--gray);
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    padding: 8px 14px;
    border-radius: 8px;
    transition: all var(--transition);
}
.opc-nav-links a:hover {
    color: var(--light);
    background: rgba(255, 255, 255, 0.05);
}
.opc-nav-links a.active {
    background: var(--primary);
    color: #fff;
}
.opc-ecosystem-badge {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 8px;
    border: 1px solid var(--border);
    color: var(--gray);
    font-size: 12px;
    text-decoration: none;
    transition: all var(--transition);
}
.opc-ecosystem-badge:hover {
    border-color: var(--primary);
    color: var(--primary-light);
}
.opc-ecosystem-badge .dot {
    width: 6px; height: 6px;
    background: var(--primary);
    border-radius: 50%;
}

/* Mobile nav toggle */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--light);
    font-size: 1.4rem;
    cursor: pointer;
    padding: 4px;
}

/* ---- Buttons ---- */
.btn {
    padding: 14px 32px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 16px;
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    border: none;
    font-family: var(--font-body);
}
.btn-primary {
    background: var(--primary);
    color: white;
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(165, 28, 48, 0.3);
}
.btn-secondary {
    background: transparent;
    color: var(--light);
    border: 2px solid var(--border);
}
.btn-secondary:hover {
    border-color: var(--primary);
    color: var(--primary-light);
}
.btn-outline {
    background: transparent;
    color: var(--primary-light);
    border: 1px solid var(--primary);
    padding: 10px 22px;
    border-radius: var(--radius);
    font-weight: 500;
    font-size: 0.88rem;
    cursor: pointer;
    transition: var(--transition);
}
.btn-outline:hover { background: var(--primary-glow); }

/* ---- Hero ---- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: linear-gradient(135deg, var(--darker) 0%, #1a0a10 50%, var(--darker) 100%);
    padding-top: 60px;
}
.hero h1 {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #fff 0%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero p {
    font-size: 1.25rem;
    color: var(--gray);
    max-width: 600px;
    margin: 0 auto 40px;
}

/* ---- Page Header ---- */
.page-header {
    padding: 140px 0 60px;
    text-align: center;
    background: linear-gradient(135deg, var(--darker) 0%, #1a0a10 50%, var(--darker) 100%);
}
.page-header h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #fff 0%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.page-header p {
    font-size: 1.15rem;
    color: var(--gray);
    max-width: 600px;
    margin: 0 auto;
}

/* ---- Section Title ---- */
.section-title {
    text-align: center;
    margin-bottom: 50px;
}
.section-title h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 12px;
}
.section-title p {
    color: var(--gray);
    font-size: 1rem;
}

/* ---- Features Grid ---- */
.features {
    padding: 100px 0;
    background: var(--dark);
}
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
}
.feature-card {
    background: var(--darker);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 32px;
    transition: all 0.3s ease;
}
.feature-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
}
.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--primary-light);
}
.feature-card p {
    color: var(--gray);
    font-size: 14px;
}

/* ---- Cards (shared pattern) ---- */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

/* ---- Filter Buttons ---- */
.filter-bar {
    padding: 40px 0;
    background: var(--dark);
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
}
.filter-btn {
    padding: 8px 20px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--gray);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: var(--font-body);
}
.filter-btn:hover,
.filter-btn.active {
    border-color: var(--primary);
    color: var(--primary-light);
    background: var(--primary-glow);
}

/* ---- Search Bar ---- */
.search-section {
    padding: 40px 0;
    background: var(--dark);
}
.search-bar {
    display: flex;
    gap: 16px;
    max-width: 700px;
    margin: 0 auto 24px;
    flex-wrap: wrap;
}
.search-input {
    flex: 1;
    min-width: 250px;
    padding: 14px 18px;
    background: var(--darker);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--light);
    font-size: 15px;
    font-family: var(--font-body);
    transition: border-color 0.2s;
}
.search-input:focus { outline: none; border-color: var(--primary); }
.search-input::placeholder { color: var(--gray); }

/* ---- Resource Cards ---- */
.resources-section {
    padding: 60px 0 100px;
    background: var(--dark);
}
.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}
.resource-card {
    background: var(--darker);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 28px;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}
.resource-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
}
.resource-icon {
    width: 48px; height: 48px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    margin-bottom: 16px;
}
.resource-type {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
    margin-bottom: 12px;
}
.type-whitepaper { background: rgba(99,102,241,0.15); color: #818cf8; border: 1px solid rgba(99,102,241,0.3); }
.type-case-study { background: rgba(16,185,129,0.15); color: #34d399; border: 1px solid rgba(16,185,129,0.3); }
.type-template { background: rgba(245,158,11,0.15); color: #fbbf24; border: 1px solid rgba(245,158,11,0.3); }
.type-tool { background: rgba(165,28,48,0.15); color: #D1334A; border: 1px solid rgba(165,28,48,0.3); }
.resource-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--light);
    margin-bottom: 10px;
}
.resource-card p {
    color: var(--gray);
    font-size: 14px;
    flex: 1;
    margin-bottom: 20px;
    line-height: 1.6;
}
.resource-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: auto;
}
.resource-info {
    font-size: 12px;
    color: var(--gray);
}
.btn-download {
    padding: 8px 18px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 13px;
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--primary);
    color: white;
    border: none;
    cursor: pointer;
    font-family: var(--font-body);
}
.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(165, 28, 48, 0.3);
}

/* ---- Member Cards ---- */
.members-section {
    padding: 60px 0 100px;
    background: var(--dark);
}
.members-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}
.member-card {
    background: var(--darker);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 28px;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}
.member-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
}
.member-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}
.member-logo {
    width: 56px; height: 56px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 800;
    color: white;
    flex-shrink: 0;
}
.member-info h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--light);
    margin-bottom: 4px;
}
.category-badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
    background: var(--primary-glow);
    color: var(--primary-light);
    border: 1px solid rgba(165, 28, 48, 0.2);
}
.member-desc {
    color: var(--gray);
    font-size: 14px;
    flex: 1;
    margin-bottom: 20px;
    line-height: 1.6;
}
.member-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: auto;
}
.member-location {
    font-size: 12px;
    color: var(--gray);
}
.view-profile {
    color: var(--primary-light);
    text-decoration: none;
    font-size: 13px;
    font-weight: 600;
    transition: opacity 0.2s;
}
.view-profile:hover { opacity: 0.8; }

/* ---- Event Cards ---- */
.events-section {
    padding: 60px 0;
    background: var(--dark);
}
.events-section.past-section {
    background: var(--darker);
}
.event-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin-bottom: 40px;
}
.events-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 24px;
}
.event-card {
    background: var(--darker);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.3s ease;
}
.event-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
}
.event-card-banner {
    height: 8px;
    width: 100%;
}
.event-card-body {
    padding: 24px;
}
.event-date-block {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 16px;
}
.event-date-cal {
    width: 56px; height: 56px;
    background: var(--dark);
    border: 1px solid var(--border);
    border-radius: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}
.event-date-cal .month {
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--primary-light);
    letter-spacing: 1px;
}
.event-date-cal .day {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--light);
    line-height: 1;
}
.event-type-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
}
.badge-hackathon { background: rgba(99,102,241,0.15); color: #818cf8; border: 1px solid rgba(99,102,241,0.3); }
.badge-demo { background: rgba(16,185,129,0.15); color: #34d399; border: 1px solid rgba(16,185,129,0.3); }
.badge-workshop { background: rgba(245,158,11,0.15); color: #fbbf24; border: 1px solid rgba(245,158,11,0.3); }
.badge-investor { background: rgba(165,28,48,0.15); color: #D1334A; border: 1px solid rgba(165,28,48,0.3); }
.event-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--light);
}
.event-card p {
    color: var(--gray);
    font-size: 14px;
    margin-bottom: 20px;
    line-height: 1.6;
}
.event-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.event-location {
    font-size: 12px;
    color: var(--gray);
}
.btn-register {
    padding: 8px 20px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 13px;
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    border: none;
    cursor: pointer;
    font-family: var(--font-body);
}
.btn-register.primary {
    background: var(--primary);
    color: white;
}
.btn-register.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(165, 28, 48, 0.3);
}
.btn-register.past {
    background: transparent;
    color: var(--gray);
    border: 1px solid var(--border);
}

/* ---- Pricing ---- */
.plans {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    max-width: 960px;
    margin: 0 auto;
    padding: 4rem 2rem;
}
.plan {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 20px;
    padding: 2.5rem;
    text-align: center;
    position: relative;
    transition: all .3s;
}
.plan:hover { transform: translateY(-4px); border-color: var(--primary); }
.plan.popular { border-color: var(--primary); background: var(--primary-glow); }
.badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary);
    color: #fff;
    padding: 4px 20px;
    border-radius: 20px;
    font-size: .8rem;
    font-weight: 600;
}
.plan h3 { font-size: 1.3rem; margin-bottom: .5rem; }
.price {
    font-size: 2.2rem;
    font-weight: 800;
    color: #fff;
    margin: 1rem 0;
}
.plan ul { list-style: none; text-align: left; margin: 1.5rem 0; }
.plan ul li {
    padding: .5rem 0;
    color: rgba(255,255,255,0.7);
    font-size: .9rem;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}
.plan ul li::before { content: "✓ "; color: #10b981; font-weight: 700; }

/* ---- CTA Section ---- */
.cta {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary) 0%, #4a0a15 100%);
    text-align: center;
}
.cta h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 16px;
}

/* ---- No Results ---- */
.no-results {
    text-align: center;
    padding: 60px 20px;
    color: var(--gray);
    display: none;
}
.no-results.show { display: block; }
.no-results h3 { font-size: 1.3rem; margin-bottom: 8px; color: var(--light); }

/* ---- Footer ---- */
footer {
    padding: 40px 0;
    background: var(--darker);
    border-top: 1px solid var(--border);
    text-align: center;
    color: var(--gray);
    font-size: 14px;
}
footer a { color: var(--primary-light); text-decoration: none; }
footer a:hover { text-decoration: underline; }
.footer-links {
    display: flex;
    gap: 24px;
    justify-content: center;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

/* ---- Scroll Animations (initial state) ---- */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
    .features-grid,
    .members-grid,
    .resources-grid { grid-template-columns: 1fr; }
    .events-grid { grid-template-columns: 1fr; }
    .nav-toggle { display: block; }
    .opc-nav-links { display: none; }
    .opc-nav-links.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        background: rgba(2, 6, 23, 0.98);
        border-bottom: 1px solid var(--border);
        padding: 12px 24px;
        gap: 4px;
    }
    .container { padding: 1rem; }
    .filter-bar { padding: 20px 1rem; }
    .plans { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
    .opc-nav-links { display: none; }
    .opc-nav-links.open { display: flex; }
    .footer-links { gap: 12px; }
}