:root {
    --bg-deep: #0a0e1a;
    --bg-card: rgba(255, 255, 255, 0.03);
    --bg-card-hover: rgba(255, 255, 255, 0.06);
    --text: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.5);
    --accent-cyan: #00d4ff;
    --accent-purple: #a855f7;
    --accent-pink: #ec4899;
    --accent-blue: #3b82f6;
    --border: rgba(255, 255, 255, 0.08);
    --border-light: rgba(255, 255, 255, 0.04);
    --glow-cyan: rgba(0, 212, 255, 0.3);
    --glow-purple: rgba(168, 85, 247, 0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
}

input, textarea {
    -webkit-user-select: text;
    user-select: text;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    font-family: 'Noto Sans SC', sans-serif;
    background: var(--bg-deep);
    color: var(--text);
    overflow-x: hidden;
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1rem 2rem;
    background: rgba(10, 14, 26, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border);
    transition: all 0.3s ease;
}

nav.scrolled {
    background: rgba(10, 14, 26, 0.95);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.logo {
    font-size: 1.3rem;
    font-weight: 900;
    color: var(--text);
    cursor: pointer;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    transition: transform 0.3s ease;
}

.logo:hover .logo-icon {
    transform: rotate(10deg) scale(1.1);
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
    padding: 0.5rem 0;
}

.nav-links a:hover {
    color: var(--accent-cyan);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
    transition: width 0.3s ease;
}

.nav-links a:hover::after {
    width: 100%;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.75rem;
    z-index: 1001;
    min-width: 44px;
    min-height: 44px;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--text);
    transition: all 0.3s ease;
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

.mobile-nav {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(10, 14, 26, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 999;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2rem;
}

.mobile-nav.active {
    display: flex;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.mobile-nav a {
    color: var(--text);
    text-decoration: none;
    font-size: 1.4rem;
    font-weight: 600;
    transition: color 0.3s ease;
    padding: 1rem 2rem;
    min-width: 44px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.mobile-nav a:hover,
.mobile-nav a:active {
    color: var(--accent-cyan);
}

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at 20% 50%, rgba(0, 212, 255, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 50%, rgba(168, 85, 247, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 100%, rgba(236, 72, 153, 0.05) 0%, transparent 50%);
    z-index: 0;
}

#particle-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 900px;
    padding: 0 2rem;
}

.hero-badge {
    display: inline-block;
    padding: 0.5rem 1.5rem;
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid rgba(0, 212, 255, 0.3);
    border-radius: 50px;
    font-size: 0.9rem;
    color: var(--accent-cyan);
    margin-bottom: 2rem;
    animation: pulse-glow 2s ease-in-out infinite, float 3s ease-in-out infinite;
}

@keyframes pulse-glow {
    0%, 100% { box-shadow: 0 0 20px rgba(0, 212, 255, 0.2); }
    50% { box-shadow: 0 0 40px rgba(0, 212, 255, 0.4); }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.hero h1 {
    font-size: clamp(2.2rem, 6vw, 4.5rem);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--text) 0%, var(--accent-cyan) 50%, var(--accent-purple) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 1s ease forwards;
}

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

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 1s ease 0.2s forwards;
    opacity: 0;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 1s ease 0.4s forwards;
    opacity: 0;
}

.btn {
    padding: 1rem 2.5rem;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    border: none;
    font-family: inherit;
    position: relative;
    overflow: hidden;
    min-width: 44px;
    min-height: 44px;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.btn:hover::before {
    left: 100%;
}

.btn:hover {
    transform: translateY(-3px);
}

.btn:active {
    transform: translateY(-1px) scale(0.98);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    color: white;
    box-shadow: 0 4px 20px var(--glow-cyan);
}

.btn-primary:hover {
    box-shadow: 0 8px 30px var(--glow-cyan), 0 0 60px var(--glow-purple);
}

.btn-secondary {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    border-color: var(--accent-cyan);
    background: rgba(0, 212, 255, 0.05);
}

section {
    padding: 6rem 2rem;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-label {
    display: inline-block;
    padding: 0.4rem 1rem;
    background: rgba(168, 85, 247, 0.1);
    border: 1px solid rgba(168, 85, 247, 0.3);
    border-radius: 50px;
    font-size: 0.85rem;
    color: var(--accent-purple);
    margin-bottom: 1rem;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 900;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--text), var(--accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-desc {
    color: var(--text-muted);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

.definition-section {
    background: linear-gradient(180deg, var(--bg-deep) 0%, rgba(0, 212, 255, 0.02) 50%, var(--bg-deep) 100%);
}

.definition-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.definition-text h3 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text);
}

.definition-text p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
}

.definition-visual {
    position: relative;
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.agent-orbit {
    width: 300px;
    height: 300px;
    position: relative;
}

.orbit-center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    box-shadow: 0 0 40px var(--glow-cyan), 0 0 80px var(--glow-purple);
    z-index: 10;
    animation: pulse-center 2s ease-in-out infinite;
}

@keyframes pulse-center {
    0%, 100% { transform: translate(-50%, -50%) scale(1); }
    50% { transform: translate(-50%, -50%) scale(1.05); }
}

.orbit-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border: 1px solid rgba(0, 212, 255, 0.2);
    border-radius: 50%;
}

.orbit-ring-1 {
    width: 150px;
    height: 150px;
    animation: rotate 10s linear infinite;
}

.orbit-ring-2 {
    width: 220px;
    height: 220px;
    animation: rotate 15s linear infinite reverse;
}

.orbit-ring-3 {
    width: 290px;
    height: 290px;
    animation: rotate 20s linear infinite;
}

.orbit-node {
    position: absolute;
    width: 40px;
    height: 40px;
    background: var(--bg-card);
    border: 1px solid var(--accent-cyan);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.2);
    transition: all 0.3s ease;
}

.orbit-node:hover {
    transform: scale(1.2);
    box-shadow: 0 0 30px rgba(0, 212, 255, 0.4);
    border-color: var(--accent-purple);
}

@keyframes rotate {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

.features-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 2.5rem;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-8px);
    background: var(--bg-card-hover);
    border-color: rgba(0, 212, 255, 0.2);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 212, 255, 0.05);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.1), rgba(168, 85, 247, 0.1));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(0, 212, 255, 0.2);
    transition: all 0.3s ease;
}

.feature-card:hover .feature-icon {
    transform: rotate(5deg) scale(1.1);
    border-color: var(--accent-purple);
}

.feature-card h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text);
}

.feature-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.7;
}

.scenarios-section {
    background: linear-gradient(180deg, var(--bg-deep) 0%, rgba(168, 85, 247, 0.02) 50%, var(--bg-deep) 100%);
}

.scenarios-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.scenario-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 2rem;
    display: flex;
    gap: 1.5rem;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.scenario-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.05), rgba(0, 212, 255, 0.05));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.scenario-card:hover {
    transform: translateX(8px);
    border-color: rgba(168, 85, 247, 0.3);
    background: var(--bg-card-hover);
}

.scenario-card:hover::after {
    opacity: 1;
}

.scenario-icon {
    width: 60px;
    height: 60px;
    min-width: 60px;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-pink));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    transition: transform 0.3s ease;
}

.scenario-card:hover .scenario-icon {
    transform: rotate(10deg) scale(1.1);
}

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

.scenario-content h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text);
}

.scenario-content p {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.6;
}

.architecture-content {
    max-width: 1000px;
    margin: 0 auto;
}

.arch-flow {
    display: flex;
    flex-direction: column;
    gap: 0;
    position: relative;
}

.arch-layer {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    margin-bottom: 2rem;
    position: relative;
    transition: all 0.3s ease;
}

.arch-layer:hover {
    border-color: rgba(0, 212, 255, 0.3);
    background: var(--bg-card-hover);
    transform: scale(1.02);
}

.arch-layer::after {
    content: '';
    position: absolute;
    bottom: -2rem;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 2rem;
    background: linear-gradient(180deg, var(--accent-cyan), var(--accent-purple));
}

.arch-layer:last-child::after {
    display: none;
}

.arch-layer-inner {
    display: flex;
    gap: 2rem;
    align-items: center;
    flex-wrap: wrap;
    justify-content: center;
}

.arch-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 1.5rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 12px;
    border: 1px solid var(--border-light);
    min-width: 120px;
    transition: all 0.3s ease;
}

.arch-item:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(0, 212, 255, 0.2);
    transform: translateY(-5px);
}

.arch-item-icon {
    font-size: 1.5rem;
}

.arch-item-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.arch-title {
    position: absolute;
    left: -140px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent-cyan);
    text-align: right;
    width: 120px;
}

.demo-section {
    background: linear-gradient(180deg, var(--bg-deep) 0%, rgba(0, 212, 255, 0.02) 50%, var(--bg-deep) 100%);
}

.demo-container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 24px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.demo-header {
    padding: 1.5rem 2rem;
    background: rgba(255, 255, 255, 0.02);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.demo-avatar {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    animation: pulse-glow 2s ease-in-out infinite;
}

.demo-info h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
}

.demo-info span {
    font-size: 0.8rem;
    color: var(--accent-cyan);
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.demo-info span::before {
    content: '';
    width: 8px;
    height: 8px;
    background: #22c55e;
    border-radius: 50%;
    animation: blink 1s ease-in-out infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.demo-chat {
    padding: 2rem;
    min-height: 300px;
    max-height: 400px;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--accent-cyan) var(--bg-deep);
}

.demo-chat::-webkit-scrollbar {
    width: 6px;
}

.demo-chat::-webkit-scrollbar-track {
    background: var(--bg-deep);
}

.demo-chat::-webkit-scrollbar-thumb {
    background: var(--accent-cyan);
    border-radius: 3px;
}

.chat-message {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    opacity: 0;
    transform: translateY(20px);
    animation: messageIn 0.5s ease forwards;
}

@keyframes messageIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.chat-avatar {
    width: 36px;
    height: 36px;
    min-width: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
}

.chat-avatar.user {
    background: rgba(255, 255, 255, 0.1);
}

.chat-avatar.agent {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
}

.chat-bubble {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1rem 1.25rem;
    max-width: 80%;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.chat-bubble.agent-bubble {
    background: rgba(0, 212, 255, 0.05);
    border-color: rgba(0, 212, 255, 0.2);
}

.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 1rem 1.25rem;
}

.typing-dot {
    width: 8px;
    height: 8px;
    background: var(--accent-cyan);
    border-radius: 50%;
    animation: typingBounce 1.4s ease-in-out infinite;
}

.typing-dot:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-dot:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typingBounce {
    0%, 60%, 100% { transform: translateY(0); }
    30% { transform: translateY(-10px); }
}

.demo-input-area {
    padding: 1.5rem 2rem;
    border-top: 1px solid var(--border);
    display: flex;
    gap: 1rem;
}

.demo-input {
    flex: 1;
    padding: 0.875rem 1.25rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--text);
    font-size: 0.95rem;
    font-family: inherit;
    outline: none;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.demo-input:focus {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.1);
}

.demo-input::placeholder {
    color: var(--text-muted);
}

.demo-send {
    padding: 0.875rem 1.5rem;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    border: none;
    border-radius: 12px;
    color: white;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    min-height: 44px;
}

.demo-send:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 20px var(--glow-cyan);
}

.demo-send:active {
    transform: scale(0.95);
}

footer {
    background: rgba(0, 0, 0, 0.3);
    border-top: 1px solid var(--border);
    padding: 3rem 2rem;
    text-align: center;
}

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

footer .highlight {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.3s ease;
    z-index: 999;
    box-shadow: 0 4px 20px var(--glow-cyan);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    min-height: 44px;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px var(--glow-cyan);
}

.fade-in {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-in-left {
    opacity: 0;
    transform: translateX(-40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.fade-in-right {
    opacity: 0;
    transform: translateX(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    nav {
        padding: 1rem;
    }

    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .definition-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .definition-visual {
        height: 300px;
    }

    .agent-orbit {
        transform: scale(0.8);
    }

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

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

    .arch-title {
        position: static;
        transform: none;
        text-align: center;
        width: auto;
        margin-bottom: 1rem;
    }

    .arch-layer {
        flex-direction: column;
    }

    .arch-layer-inner {
        flex-direction: column;
        gap: 1rem;
    }

    .arch-item {
        width: 100%;
    }

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

    .btn {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }

    .demo-chat {
        max-height: 300px;
    }

    .back-to-top {
        bottom: 1.5rem;
        right: 1.5rem;
        width: 48px;
        height: 48px;
        font-size: 1.3rem;
    }
}

@media (max-width: 480px) {
    section {
        padding: 4rem 1.25rem;
    }

    .hero-content {
        padding: 0 1.25rem;
    }

    .hero h1 {
        font-size: 2rem;
        line-height: 1.2;
    }

    .hero-subtitle {
        font-size: 1rem;
        margin-bottom: 2.5rem;
    }

    .hero-badge {
        font-size: 0.85rem;
        padding: 0.4rem 1.2rem;
        margin-bottom: 1.5rem;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .section-label {
        font-size: 0.8rem;
        padding: 0.35rem 0.9rem;
    }

    .section-desc {
        font-size: 1rem;
    }

    .feature-card {
        padding: 1.75rem;
        border-radius: 16px;
    }

    .feature-icon {
        width: 54px;
        height: 54px;
        font-size: 1.6rem;
    }

    .feature-card h3 {
        font-size: 1.15rem;
    }

    .feature-card p {
        font-size: 0.9rem;
    }

    .scenario-card {
        padding: 1.5rem;
        border-radius: 16px;
        flex-direction: column;
        text-align: center;
    }

    .scenario-icon {
        margin: 0 auto;
        width: 54px;
        height: 54px;
        font-size: 1.4rem;
    }

    .scenario-content h3 {
        font-size: 1.1rem;
    }

    .scenario-content p {
        font-size: 0.88rem;
    }

    .demo-container {
        border-radius: 16px;
    }

    .demo-header {
        padding: 1.25rem 1.5rem;
    }

    .demo-chat {
        padding: 1.5rem;
        min-height: 250px;
    }

    .demo-input-area {
        padding: 1.25rem 1.5rem;
        gap: 0.75rem;
    }

    .demo-input {
        padding: 0.75rem 1rem;
        font-size: 0.9rem;
    }

    .demo-send {
        padding: 0.75rem 1.25rem;
        font-size: 0.9rem;
    }

    .definition-text h3 {
        font-size: 1.6rem;
    }

    .definition-text p {
        font-size: 1rem;
    }

    .orbit-node {
        width: 36px;
        height: 36px;
        font-size: 1.1rem;
    }

    .orbit-center {
        width: 72px;
        height: 72px;
        font-size: 1.8rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .hero-badge,
    .orbit-center,
    .demo-avatar,
    .demo-info span::before {
        animation: none !important;
    }
}