:root {
    --bg-color: #0b0f19;
    --text-primary: #ffffff;
    --text-secondary: #94a3b8;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --card-bg: rgba(30, 41, 59, 0.5);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 5%;
    background: rgba(11, 15, 25, 0.8);
    backdrop-filter: blur(10px);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.logo {
    font-weight: 800;
    font-size: 1.5rem;
    letter-spacing: -0.5px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    margin-left: 2rem;
    font-size: 0.9rem;
    font-weight: 600;
    transition: color 0.3s;
}

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

.btn-nav {
    background: var(--accent-color);
    color: white !important;
    padding: 0.5rem 1rem;
    border-radius: 8px;
}

.btn-nav:hover {
    background: var(--accent-hover);
}

/* Language Select */
.lang-select {
    margin-left: 2rem;
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    font-family: inherit;
    font-size: 0.85rem;
    outline: none;
    cursor: pointer;
    transition: background 0.3s;
}

.lang-select:hover {
    background: rgba(255, 255, 255, 0.2);
}

.lang-select option {
    background: var(--bg-color);
    color: var(--text-primary);
}

/* Hero with Video */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 0 5%;
    overflow: hidden;
}

.video-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
}

.video-bg video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transform: scale(1.1);
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(11, 15, 25, 0.7);
    z-index: -1;
}

.hero-content {
    z-index: 1;
}

/* Science Section */
.science {
    padding: 6rem 5%;
}

.science h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.sci-subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 3rem;
}

.chart-container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: 20px;
    border: 1px solid rgba(255,255,255,0.05);
}

.chart-row {
    margin-bottom: 1.5rem;
}

.chart-row span {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.bar-wrapper {
    width: 100%;
    background: rgba(255,255,255,0.1);
    border-radius: 15px;
    height: 30px;
    overflow: hidden;
}

.bar {
    height: 100%;
    display: flex;
    align-items: center;
    padding-left: 15px;
    color: white;
    font-size: 0.85rem;
    font-weight: bold;
    white-space: nowrap;
    border-radius: 15px;
}

.bar-low {
    background: #64748b;
}

.bar-high {
    background: linear-gradient(90deg, #3b82f6, #8b5cf6);
}

/* Empathy Section */
.empathy {
    padding: 6rem 5%;
    background: linear-gradient(to bottom, transparent, rgba(30, 41, 59, 0.3), transparent);
    text-align: center;
}

.empathy-text {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.5;
    max-width: 800px;
    margin: 0 auto;
}
.highlight {
    color: var(--accent-color);
}

/* Pricing Section (4 Cards) */
.pricing {
    padding: 6rem 5%;
    background: radial-gradient(circle at top, rgba(30, 41, 59, 0.4) 0%, transparent 70%);
}

.pricing h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.p-card {
    background: var(--card-bg);
    border: 1px solid rgba(255,255,255,0.05);
    border-radius: 24px;
    padding: 2rem;
    position: relative;
    display: flex;
    flex-direction: column;
}

.p-card.vip {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.1), rgba(239, 68, 68, 0.1));
    border-color: rgba(245, 158, 11, 0.3);
    transform: scale(1.05);
}

.tier-name {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.p-card.std .tier-name { color: #94A3B8; }
.p-card.pro .tier-name { color: #3B82F6; }
.p-card.prem .tier-name { color: #EC4899; }
.p-card.vip .tier-name { color: #F59E0B; }

.p-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    min-height: 40px;
}

.f-list {
    list-style: none;
    flex-grow: 1;
}

.f-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.f-item.off {
    opacity: 0.4;
}

.f-item strong {
    display: block;
    font-weight: 600;
    margin-bottom: 4px;
}

.f-item span {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.chk {
    margin-right: 10px;
}

.p-card.std .chk { color: #10B981; }
.p-card.pro .chk { color: #3B82F6; }
.p-card.prem .chk { color: #EC4899; }
.p-card.vip .chk { color: #F59E0B; }

@media (max-width: 1024px) {
    .p-card.vip { transform: none; }
}

.hero-content h1 {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    background: linear-gradient(to right, #ffffff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-content p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2.5rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.btn-primary, .btn-secondary {
    padding: 1rem 2rem;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.3s, box-shadow 0.3s;
}

.btn-primary {
    background: var(--accent-color);
    color: white;
    box-shadow: 0 4px 14px 0 rgba(59, 130, 246, 0.39);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.5);
}

.btn-secondary {
    background: var(--card-bg);
    color: var(--text-primary);
    border: 1px solid rgba(255,255,255,0.1);
}

.btn-secondary:hover {
    background: rgba(30, 41, 59, 0.8);
}

/* Features */
.features {
    padding: 5rem 5%;
}

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: 20px;
    border: 1px solid rgba(255,255,255,0.05);
    backdrop-filter: blur(10px);
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: rgba(255,255,255,0.1);
}

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

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.feature-card p {
    color: var(--text-secondary);
}

/* Security Section */
.security {
    padding: 6rem 5%;
    background: linear-gradient(to right, rgba(59, 130, 246, 0.1), transparent);
    border-top: 1px solid rgba(255,255,255,0.05);
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.security-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.security h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.security p {
    font-size: 1.2rem;
    color: var(--text-secondary);
}

/* Footer */
.footer {
    padding: 4rem 5% 2rem;
    border-top: 1px solid rgba(255,255,255,0.05);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.footer-brand {
    font-size: 1.5rem;
    font-weight: 800;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    margin-left: 1.5rem;
}

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

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

/* Responsive */
@media (max-width: 768px) {
    .hero-content h1 { font-size: 2.5rem; }
    .hero-buttons { flex-direction: column; }
    .nav-links { display: none; }
    .footer-content { flex-direction: column; gap: 1rem; }
    .footer-links a { margin: 0 0.75rem; }
}