/* ===== CSS Variables & Reset ===== */
:root {
    --color-bg: #0a0a0f;
    --color-bg-secondary: #12121a;
    --color-surface: rgba(255, 255, 255, 0.03);
    --color-surface-hover: rgba(255, 255, 255, 0.06);
    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-hover: rgba(255, 255, 255, 0.15);
    --color-text: #ffffff;
    --color-text-secondary: rgba(255, 255, 255, 0.7);
    --color-text-tertiary: rgba(255, 255, 255, 0.5);
    --color-primary: #6366f1;
    --color-primary-light: #818cf8;
    --color-secondary: #a855f7;
    --color-accent: #06b6d4;
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
    --gradient-glow: linear-gradient(135deg, rgba(99, 102, 241, 0.4) 0%, rgba(168, 85, 247, 0.4) 100%);
    --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    --container-max: 1200px;
    --section-padding: 120px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --transition-fast: 0.15s ease;
    --transition-medium: 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

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

/* Background Animation */
.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.3;
    animation: float 20s infinite ease-in-out;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: var(--color-primary);
    top: -200px;
    right: -200px;
}

.orb-2 {
    width: 500px;
    height: 500px;
    background: var(--color-secondary);
    bottom: -150px;
    left: -150px;
    animation-delay: -7s;
}

.orb-3 {
    width: 400px;
    height: 400px;
    background: var(--color-accent);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -14s;
    opacity: 0.15;
}

@keyframes float {

    0%,
    100% {
        transform: translate(0, 0) scale(1);
    }

    50% {
        transform: translate(-20px, 20px) scale(0.95);
    }
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* Navigation */
.nav-glass {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.nav-content {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 40px;
    height: 40px;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-text);
}

/* CTA Buttons */
.cta-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-medium);
    cursor: pointer;
    border: none;
}

.cta-btn-nav {
    background: var(--gradient-primary);
    color: white;
    padding: 10px 20px;
    font-size: 0.9rem;
}

.cta-btn-nav:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.4);
}

.cta-btn-primary {
    background: var(--gradient-primary);
    color: white;
    padding: 16px 32px;
    font-size: 1.1rem;
}

.cta-btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(99, 102, 241, 0.5);
}

.cta-btn-secondary {
    background: var(--color-surface);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    padding: 16px 32px;
    font-size: 1.1rem;
}

.cta-btn-secondary:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-border-hover);
}

.cta-btn-large {
    background: var(--gradient-primary);
    color: white;
    padding: 20px 48px;
    font-size: 1.2rem;
    border-radius: var(--radius-lg);
}

.cta-btn-large:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 50px rgba(99, 102, 241, 0.5);
}

.cta-arrow {
    width: 20px;
    height: 20px;
    transition: transform var(--transition-fast);
}

.cta-btn:hover .cta-arrow {
    transform: translateX(4px);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 60px;
    padding: 120px 24px 80px;
    max-width: var(--container-max);
    margin: 0 auto;
}

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

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 100px;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: 24px;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--color-primary);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.5;
        transform: scale(1.2);
    }
}

.hero-title {
    font-size: clamp(3rem, 6vw, 4.5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
}

.title-line {
    display: block;
}

.title-gradient {
    display: block;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--color-text-secondary);
    margin-bottom: 16px;
    line-height: 1.5;
}

.hero-subtitle strong {
    color: var(--color-text);
    font-weight: 600;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--color-text-tertiary);
    margin-bottom: 40px;
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    gap: 16px;
    margin-bottom: 60px;
}

.hero-stats {
    display: flex;
    align-items: center;
    gap: 32px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--color-border);
}

/* Hero Visual */
.hero-visual {
    position: relative;
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.entity-graph {
    position: relative;
    width: 400px;
    height: 400px;
}

.entity-connections {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.connection {
    stroke-width: 2;
    opacity: 0.6;
    animation: connectionPulse 3s infinite;
}

.connection-secondary {
    stroke: rgba(255, 255, 255, 0.1);
    stroke-width: 1;
    stroke-dasharray: 4 4;
}

@keyframes connectionPulse {

    0%,
    100% {
        opacity: 0.4;
    }

    50% {
        opacity: 0.8;
    }
}

.entity-node {
    position: absolute;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    transition: all var(--transition-medium);
    cursor: pointer;
}

.entity-node::after {
    content: attr(data-label);
}

.entity-node:hover {
    border-color: var(--color-primary);
    background: rgba(99, 102, 241, 0.1);
    transform: scale(1.1);
}

.node-center {
    width: 80px;
    height: 80px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--gradient-primary);
    border: none;
    color: white;
    font-size: 1rem;
}

.node-center:hover {
    transform: translate(-50%, -50%) scale(1.1);
}

.node-pulse {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: var(--gradient-primary);
    animation: nodePulse 2s infinite;
}

@keyframes nodePulse {
    0% {
        transform: scale(1);
        opacity: 0.5;
    }

    100% {
        transform: scale(2);
        opacity: 0;
    }
}

.node-1 {
    top: 30px;
    left: 80px;
}

.node-2 {
    top: 50px;
    right: 60px;
}

.node-3 {
    top: 170px;
    right: 30px;
}

.node-4 {
    bottom: 50px;
    right: 80px;
}

.node-5 {
    bottom: 60px;
    left: 90px;
}

.node-6 {
    top: 140px;
    left: 30px;
}

/* Problem Section */
.problem-section {
    padding: var(--section-padding) 0;
    background: var(--color-bg-secondary);
}

.problem-grid {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

.problem-card {
    flex: 1;
    min-width: 300px;
    max-width: 400px;
    padding: 40px;
    border-radius: var(--radius-xl);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
}

.problem-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.problem-card h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
}

.problem-card ul {
    list-style: none;
}

.problem-card li {
    padding: 8px 0;
    color: var(--color-text-secondary);
    position: relative;
    padding-left: 24px;
}

.problem-card li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.problem-old li::before {
    background: #ef4444;
}

.problem-new li::before {
    background: var(--color-primary);
}

.problem-card em {
    color: var(--color-text);
    font-style: normal;
    font-weight: 600;
}

.problem-arrow {
    width: 60px;
    flex-shrink: 0;
}

.problem-arrow svg {
    width: 100%;
}

/* Section Headers */
.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-tag {
    display: inline-block;
    padding: 8px 16px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 100px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-primary-light);
    margin-bottom: 20px;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Features Section */
.features-section {
    padding: var(--section-padding) 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    padding: 32px;
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    transition: all var(--transition-medium);
}

.feature-card:hover {
    border-color: var(--color-border-hover);
    background: var(--color-surface-hover);
    transform: translateY(-4px);
}

.feature-card-large {
    grid-column: span 3;
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 40px;
    padding: 48px;
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.feature-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.logic-chain {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
}

.chain-node {
    padding: 12px 20px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    white-space: nowrap;
}

.chain-node.highlight {
    background: rgba(239, 68, 68, 0.1);
    border-color: #ef4444;
    color: #fca5a5;
}

.chain-arrow {
    color: var(--color-primary);
    font-size: 1.5rem;
}

/* How It Works Section */
.how-section {
    padding: var(--section-padding) 0;
    background: var(--color-bg-secondary);
}

.how-steps {
    display: flex;
    flex-direction: column;
    gap: 60px;
}

.how-step {
    display: grid;
    grid-template-columns: 80px 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.step-number {
    font-size: 3rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    opacity: 0.6;
}

.step-content h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.step-content p {
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.step-visual {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    min-height: 160px;
}

.profile-visual {
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-items: center;
}

.profile-item {
    padding: 8px 16px;
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
}

.profile-arrow {
    color: var(--color-primary);
    font-weight: 600;
    margin: 8px 0;
}

.profile-entities {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: center;
}

.profile-entities span {
    padding: 6px 12px;
    background: rgba(99, 102, 241, 0.2);
    border: 1px solid rgba(99, 102, 241, 0.4);
    border-radius: 100px;
    font-size: 0.8rem;
    color: var(--color-primary-light);
}

.data-flow {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
}

.data-source {
    padding: 12px 16px;
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
}

.data-arrow {
    font-size: 1.5rem;
    color: var(--color-primary);
}

.data-output {
    display: flex;
    gap: 8px;
}

.entity-tag {
    padding: 8px 16px;
    background: var(--gradient-primary);
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 600;
}

.semantic-visual {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.semantic-cluster {
    position: relative;
    width: 120px;
    height: 80px;
}

.sem-node {
    position: absolute;
    width: 16px;
    height: 16px;
    background: var(--color-border);
    border-radius: 50%;
}

.sem-node:nth-child(1) {
    top: 0;
    left: 50%;
    transform: translateX(-50%);
}

.sem-node:nth-child(2) {
    top: 30%;
    left: 10%;
}

.sem-node:nth-child(3) {
    top: 40%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient-primary);
    width: 24px;
    height: 24px;
}

.sem-node:nth-child(4) {
    top: 30%;
    right: 10%;
}

.sem-node:nth-child(5) {
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
}

.signal-indicator {
    padding: 8px 16px;
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.3);
    border-radius: 100px;
}

.signal-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: #4ade80;
}

.hop-visual {
    display: flex;
    align-items: center;
    gap: 8px;
}

.hop-node {
    padding: 12px 16px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
}

.hop-node.you {
    background: var(--gradient-primary);
    border: none;
    color: white;
    font-weight: 600;
}

.hop-node.target {
    background: rgba(99, 102, 241, 0.2);
    border-color: var(--color-primary);
    color: var(--color-primary-light);
}

.hop-line {
    width: 24px;
    height: 2px;
    background: var(--color-primary);
}

.hop-line.fade-1 {
    opacity: 0.8;
}

.hop-line.fade-2 {
    opacity: 0.6;
}

/* Use Cases Section */
.cases-section {
    padding: var(--section-padding) 0;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.case-card {
    padding: 40px;
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    transition: all var(--transition-medium);
}

.case-card:hover {
    border-color: var(--color-border-hover);
    transform: translateY(-4px);
}

.case-icon {
    font-size: 3rem;
    margin-bottom: 24px;
}

.case-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.case-card>p {
    color: var(--color-text-secondary);
    margin-bottom: 24px;
    line-height: 1.6;
}

.case-example {
    padding: 16px;
    background: var(--color-bg);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    color: var(--color-text-tertiary);
}

.example-label {
    display: inline-block;
    padding: 4px 8px;
    background: rgba(99, 102, 241, 0.2);
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-primary-light);
    margin-right: 8px;
}

/* CTA Section */
.cta-section {
    padding: var(--section-padding) 0;
}

.cta-card {
    position: relative;
    padding: 80px 60px;
    border-radius: var(--radius-xl);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    text-align: center;
    overflow: hidden;
}

.cta-bg-effect {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 600px;
    height: 600px;
    transform: translate(-50%, -50%);
    background: var(--gradient-glow);
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.3;
}

.cta-content {
    position: relative;
    z-index: 1;
}

.cta-content h2 {
    font-size: clamp(1.8rem, 3vw, 2.5rem);
    font-weight: 800;
    margin-bottom: 16px;
}

.cta-content p {
    font-size: 1.2rem;
    color: var(--color-text-secondary);
    margin-bottom: 40px;
}

/* Footer */
.footer {
    padding: 60px 0 40px;
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
}

.footer-tagline {
    color: var(--color-text-tertiary);
    margin-top: 8px;
}

.footer-links {
    display: flex;
    gap: 32px;
}

.footer-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 40px;
    border-top: 1px solid var(--color-border);
}

.footer-bottom p {
    color: var(--color-text-tertiary);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }

    .hero-cta {
        justify-content: center;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-visual {
        height: 300px;
    }

    .entity-graph {
        transform: scale(0.8);
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .feature-card-large {
        grid-column: span 2;
        grid-template-columns: 1fr;
    }

    .how-step {
        grid-template-columns: 1fr;
        gap: 24px;
        text-align: center;
    }

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

    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 80px;
    }

    .nav-links {
        display: none;
    }

    .hero {
        padding-top: 100px;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .hero-stats {
        flex-direction: column;
        gap: 24px;
    }

    .stat-divider {
        width: 40px;
        height: 1px;
    }

    .problem-grid {
        flex-direction: column;
    }

    .problem-arrow {
        transform: rotate(90deg);
    }

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

    .feature-card-large {
        grid-column: span 1;
    }

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

    .footer-content {
        flex-direction: column;
        gap: 24px;
        text-align: center;
    }

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

    .cta-card {
        padding: 60px 30px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .logic-chain {
        flex-direction: column;
    }

    .chain-arrow {
        transform: rotate(90deg);
    }

    .hop-visual {
        flex-wrap: wrap;
        justify-content: center;
    }
}