:root {
    /* 主色调 (Primary - Warm Orange/Coral based on practice.css) */
    --primary: #FF7E5F;       
    --primary-hover: #e06c50; 
    --primary-light: #fff5f2; 
    
    /* 辅助色 (Secondary/Accent) */
    --accent: #14b8a6;        /* Teal 500 - Good contrast with orange */
    
    /* 中性色 (Neutrals) */
    --text-main: #1a1a1a;     
    --text-muted: #4b5563;    
    --text-light: #9ca3af;    
    --bg-white: #ffffff;
    --bg-light: #f9fafb;      
    --border: #e5e7eb;        

    /* 渐变 */
    --gradient-hero: linear-gradient(135deg, #fff8f5 0%, #fff0f0 100%);
    --gradient-primary: linear-gradient(135deg, #FF9A44 0%, #FC6076 100%);
    
    /* 阴影 - 暖色调微调 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(255, 126, 95, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(255, 126, 95, 0.15), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    /* 尺寸与间距 */
    --container-width: 1200px;
    --header-height: 80px;
    --radius-md: 8px;
    --radius-lg: 16px;
    
    /* 字体 */
    --font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
}

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

body {
    font-family: var(--font-family);
    color: var(--text-main);
    background-color: var(--bg-white);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

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

/* ========== Navbar ========== */
.navbar {
    height: var(--header-height);
    position: sticky;
    top: 0;
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    display: flex;
    align-items: center;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-brand svg {
    width: 32px;
    height: 32px;
    fill: currentColor;
}

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

.nav-links a {
    color: var(--text-muted);
    font-weight: 500;
}

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

.nav-actions {
    display: flex;
    gap: 16px;
    align-items: center;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.95rem;
}

.btn-ghost {
    color: var(--text-muted);
    background: transparent;
}

.btn-ghost:hover {
    color: var(--primary);
    background-color: var(--primary-light);
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-1px);
}

/* ========== Hero Section ========== */
.hero {
    padding: 80px 0;
    background: var(--gradient-hero);
    overflow: hidden;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-text h1 {
    font-size: 3.5rem;
    line-height: 1.2;
    font-weight: 800;
    margin-bottom: 24px;
    color: var(--text-main);
    letter-spacing: -0.02em;
}

.hero-text h1 span {
    color: var(--primary);
}

.hero-text p {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 40px;
    max-width: 500px;
}

.hero-actions {
    display: flex;
    gap: 16px;
}

.hero-image {
    position: relative;
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 50px -12px rgba(0, 0, 0, 0.25);
    background-color: white;
    padding: 12px; /* simulate browser window or padding */
    transform: perspective(1000px) rotateY(-5deg) rotateX(2deg);
    transition: transform 0.5s ease;
}

.hero-image:hover {
    transform: perspective(1000px) rotateY(0) rotateX(0);
}

/* Placeholder for Hero Image */
.img-placeholder {
    width: 100%;
    aspect-ratio: 16 / 10;
    background-color: #e5e7eb;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #9ca3af;
    font-size: 1.2rem;
    background-image: url('data:image/svg+xml;utf8,<svg width="100" height="100" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg"><rect width="100" height="100" fill="%23f3f4f6"/><path d="M30 70 L50 40 L70 70 Z" fill="%23d1d5db"/></svg>');
    background-size: cover;
}

/* ========== Features Carousel ========== */
.features {
    padding: 100px 0;
    background-color: var(--bg-white);
    text-align: center;
}

.section-head {
    margin-bottom: 60px;
}

.section-head h2 {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.section-head p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

.carousel-container {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
    overflow: hidden;
}

.carousel-track {
    display: flex;
    transition: transform 0.5s ease-in-out;
}

.carousel-card {
    min-width: 100%;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.feature-box {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 48px;
    width: 100%;
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}

.feature-icon {
    width: 64px;
    height: 64px;
    background-color: var(--primary-light);
    color: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-icon svg {
    width: 32px;
    height: 32px;
}

.feature-box h3 {
    font-size: 1.5rem;
    font-weight: 700;
}

.feature-box p {
    color: var(--text-muted);
    max-width: 500px;
}

.carousel-nav {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-top: 32px;
}

.nav-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--border);
    cursor: pointer;
    transition: background-color 0.3s;
}

.nav-dot.active {
    background-color: var(--primary);
}

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: white;
    border: 1px solid var(--border);
    border-radius: 50%;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    z-index: 10;
}

.carousel-btn:hover {
    background-color: var(--bg-light);
}

.prev-btn { left: 0; }
.next-btn { right: 0; }


/* ========== Use Scenes Grid ========== */
.scenes {
    padding: 100px 0;
    background-color: var(--bg-light);
}

.grid-container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.scene-card {
    background: white;
    padding: 32px 24px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    transition: transform 0.2s, box-shadow 0.2s;
    text-align: center;
}

.scene-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}

.scene-icon {
    font-size: 2rem;
    margin-bottom: 20px;
    display: inline-block;
}

.scene-card h3 {
    font-size: 1.125rem;
    margin-bottom: 12px;
    font-weight: 600;
}

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

/* ========== CTA & Footer ========== */
.cta-section {
    padding: 100px 0;
    background: var(--gradient-primary);
    color: white;
    text-align: center;
}

.cta-section h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 24px;
}

.cta-section p {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.btn-white {
    background: white;
    color: var(--primary);
    padding: 16px 40px;
    font-size: 1.1rem;
    box-shadow: var(--shadow-lg);
}

.btn-white:hover {
    background-color: var(--bg-light);
    transform: translateY(-2px);
}

.footer {
    padding: 40px 0;
    background-color: #f9fafb;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.9rem;
}

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

.footer-links {
    display: flex;
    gap: 24px;
}

/* ========== Responsive ========== */
@media (max-width: 1024px) {
    .container {
        padding: 0 32px;
    }
    
    .grid-container {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .hero-text h1 {
        font-size: 3rem;
    }
}

@media (max-width: 768px) {
    .navbar .nav-links {
        display: none;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-text h1 {
        font-size: 2.5rem;
    }
    
    .hero-text p {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .hero-image {
        transform: none;
        margin-top: 40px;
    }
    
    .carousel-btn {
        display: none; /* simple hidden on mobile, rely on swipe in future or dots */
    }
    
    .grid-container {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 20px;
    }
}

/* Video Placeholder Styles */
.video-placeholder {
    display: block;
    position: relative;
    width: 100%;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.video-placeholder:hover {
    transform: translateY(-5px);
}

.video-thumbnail {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
}

.play-button-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 10;
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none; /* Let clicks pass through to the link */
    transition: transform 0.2s ease;
}

.video-placeholder:hover .play-button-overlay {
    transform: translate(-50%, -50%) scale(1.1);
}