/* ===== CSS Variables & Reset ===== */
:root {
    --bg-color: #0b0f19;
    --card-bg: rgba(22, 28, 45, 0.6);
    --border-color: rgba(255, 255, 255, 0.08);
    --primary-buyer: #00e676;
    --primary-seller: #00b0ff;
    --primary-arbitrage: #d500f9;
    --text-main: #f8fafc;
    --text-muted: #c0d0e0;
    --text-secondary: #94a3b8;
    --font-family: 'Outfit', sans-serif;
    --transition-speed: 0.3s;
    --shadow-color: rgba(0, 0, 0, 0.6);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(0, 230, 118, 0.04) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(0, 176, 255, 0.04) 0%, transparent 40%),
        radial-gradient(circle at 50% 50%, rgba(213, 0, 249, 0.03) 0%, transparent 50%);
}

/* ===== Focus Indicators for Accessibility ===== */
a:focus-visible, 
button:focus-visible {
    outline: 2px solid var(--primary-seller);
    outline-offset: 2px;
    border-radius: 4px;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 10px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-color);
}
::-webkit-scrollbar-thumb {
    background: var(--primary-seller);
    border-radius: 5px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--primary-buyer);
}

/* ===== Header Placeholder (dynamically loaded) ===== */
header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(11, 15, 25, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    min-height: 70px;
}
header.scrolled {
    background: rgba(11, 15, 25, 0.95);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.4);
}

/* ===== Hero Section ===== */
.hero {
    padding: 8rem 2rem 4rem;
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--text-main) 30%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto;
}

/* ===== Audience Profiles Section ===== */
.profiles-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.profiles-title {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 1.8rem;
    font-weight: 600;
}

.profiles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.profile-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2.5rem;
    transition: all var(--transition-speed) cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.profile-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    transition: background var(--transition-speed);
}

.profile-card.buyer::before { background: var(--primary-buyer); }
.profile-card.seller::before { background: var(--primary-seller); }
.profile-card.arbitrage::before { background: var(--primary-arbitrage); }

.profile-card:hover {
    transform: translateY(-8px);
    border-color: rgba(255, 255, 255, 0.15);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
}

.profile-card.active {
    border-color: currentColor;
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.05);
}
.profile-card.buyer.active { border-color: var(--primary-buyer); }
.profile-card.seller.active { border-color: var(--primary-seller); }
.profile-card.arbitrage.active { border-color: var(--primary-arbitrage); }

.profile-icon {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.profile-card h3 {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

.profile-card.buyer h3 { color: var(--primary-buyer); }
.profile-card.seller h3 { color: var(--primary-seller); }
.profile-card.arbitrage h3 { color: var(--primary-arbitrage); }

.profile-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.profile-select-btn {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 0.75rem;
    border-radius: 8px;
    font-weight: 600;
    width: 100%;
    cursor: pointer;
    transition: all var(--transition-speed);
    text-align: center;
}

.profile-card.buyer:hover .profile-select-btn,
.profile-card.buyer.active .profile-select-btn {
    background: var(--primary-buyer);
    color: var(--bg-color);
    border-color: var(--primary-buyer);
}

.profile-card.seller:hover .profile-select-btn,
.profile-card.seller.active .profile-select-btn {
    background: var(--primary-seller);
    color: var(--bg-color);
    border-color: var(--primary-seller);
}

.profile-card.arbitrage:hover .profile-select-btn,
.profile-card.arbitrage.active .profile-select-btn {
    background: var(--primary-arbitrage);
    color: var(--bg-color);
    border-color: var(--primary-arbitrage);
}

/* ===== Filter Tabs ===== */
.tabs-container {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin: 2rem auto;
    max-width: 800px;
    padding: 0 1rem;
    flex-wrap: wrap;
}

.tab-btn {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.75rem 1.5rem;
    border-radius: 30px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all var(--transition-speed);
}

.tab-btn:hover {
    color: var(--text-main);
    border-color: rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.05);
}

.tab-btn.active {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--text-main);
}

.tab-btn.buyer-active.active {
    border-color: var(--primary-buyer);
    background: rgba(0, 230, 118, 0.1);
    color: var(--primary-buyer);
}

.tab-btn.seller-active.active {
    border-color: var(--primary-seller);
    background: rgba(0, 176, 255, 0.1);
    color: var(--primary-seller);
}

.tab-btn.arbitrage-active.active {
    border-color: var(--primary-arbitrage);
    background: rgba(213, 0, 249, 0.1);
    color: var(--primary-arbitrage);
}

/* ===== Comparison Section ===== */
.comparison-container {
    max-width: 1200px;
    margin: 2rem auto 6rem;
    padding: 0 2rem;
    overflow-x: auto;
    position: relative;
}

/* ===== Comparative Table Style ===== */
.comp-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    min-width: 800px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.comp-table th, .comp-table td {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
}

.comp-table thead tr {
    background: rgba(15, 22, 36, 0.8);
}

.comp-table th {
    font-weight: 800;
    font-size: 1.1rem;
    color: var(--text-main);
}

.comp-table th.feature-col {
    width: 25%;
}

.plan-header-cell {
    text-align: center;
}

.plan-name {
    font-size: 1.25rem;
    font-weight: 800;
    margin-bottom: 0.25rem;
}

.plan-badge {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    margin-top: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.plan-badge.popular {
    background: rgba(255, 215, 0, 0.15);
    color: #ffd700;
    border: 1px solid rgba(ffd700, 0.3);
}

.plan-badge.audience {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.comp-table tbody tr {
    transition: background var(--transition-speed);
}

.comp-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.015);
}

.feature-title {
    font-weight: 600;
    color: var(--text-main);
}

.feature-desc {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 400;
    margin-top: 0.25rem;
}

.value-cell {
    text-align: center;
    font-weight: 600;
}

.value-cell.highlight {
    color: var(--text-main);
}

.value-disabled {
    color: var(--text-secondary);
    opacity: 0.4;
    font-weight: 400;
}

.tag-pill {
    display: inline-block;
    font-size: 0.8rem;
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-weight: 600;
}

.tag-pill.telegram {
    background: rgba(0, 176, 255, 0.1);
    color: #00b0ff;
}
.tag-pill.email {
    background: rgba(213, 0, 249, 0.1);
    color: #d500f9;
}
.tag-pill.both {
    background: rgba(0, 230, 118, 0.1);
    color: #00e676;
}

.btn-select-plan {
    display: inline-block;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 0.6rem 1.25rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all var(--transition-speed);
    width: 85%;
}

.btn-select-plan:hover {
    background: var(--text-main);
    color: var(--bg-color);
    box-shadow: 0 4px 15px rgba(255, 255, 255, 0.1);
}

.plan-col-buyer .plan-name { color: var(--primary-buyer); }
.plan-col-seller .plan-name { color: var(--primary-seller); }
.plan-col-arbitrage .plan-name { color: var(--primary-arbitrage); }

.hidden-plan {
    display: none !important;
}

/* ===== FAQ Section ===== */
.faq-section {
    max-width: 800px;
    margin: 0 auto 6rem;
    padding: 0 2rem;
}

.faq-title {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2rem;
    font-weight: 800;
}

.faq-item {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    margin-bottom: 1.25rem;
    padding: 1.5rem;
    transition: border-color var(--transition-speed);
}

.faq-item:hover {
    border-color: rgba(255, 255, 255, 0.15);
}

.faq-question {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-main);
}

.faq-answer {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* ===== Call to Action ===== */
.cta-section {
    text-align: center;
    max-width: 700px;
    margin: 6rem auto;
    padding: 0 2rem;
}

.cta-card {
    background: linear-gradient(135deg, rgba(22, 28, 45, 0.8) 0%, rgba(15, 22, 36, 0.8) 100%);
    border: 1px solid var(--border-color);
    padding: 3.5rem 2.5rem;
    border-radius: 20px;
    position: relative;
}

.cta-card h2 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

.cta-card p {
    color: var(--text-muted);
    margin-bottom: 2rem;
    font-size: 1.05rem;
}

.btn-cta {
    display: inline-block;
    background: linear-gradient(90deg, var(--primary-buyer), var(--primary-seller));
    color: var(--bg-color);
    font-weight: 800;
    padding: 1rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.btn-cta:hover {
    transform: scale(1.03);
    box-shadow: 0 8px 25px rgba(0, 230, 118, 0.2);
}

/* ===== Footer ===== */
footer {
    border-top: 1px solid var(--border-color);
    padding: 4rem 2rem;
    background: rgba(11, 15, 25, 0.95);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 2rem;
}

.footer-logo {
    font-weight: 800;
    font-size: 1.25rem;
    color: var(--text-main);
}

.footer-links {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-speed);
}

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

.footer-copy {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ===== Responsive adjustment ===== */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.25rem;
    }
    
    .footer-container {
        flex-direction: column;
        text-align: center;
    }

    .footer-links {
        justify-content: center;
    }
}