/* style.css - 质感皮具风格 (Leather Theme) */
:root {
    --bg-dark: #1A1715;
    --bg-card: #25211E;
    --text-primary: #F4EFEA;
    --text-secondary: #A89F95;
    --accent-brown: #8B5A33;
    --accent-light: #C49A6C;
    --gold: #D4AF37;
    --font-serif: 'Noto Serif SC', serif;
    --font-sans: 'Noto Sans SC', sans-serif;
    --transition: all 0.4s ease;
}

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

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

a {
    text-decoration: none;
    color: inherit;
}

/* Typography */
h1, h2, h3 {
    font-family: var(--font-serif);
    font-weight: 600;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 20px 0;
    background: rgba(26, 23, 21, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(196, 154, 108, 0.1);
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 40px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-serif);
    font-size: 1.5rem;
    color: var(--accent-light);
}

.nav-links {
    display: flex;
    gap: 40px;
}

.nav-links a {
    font-size: 0.95rem;
    color: var(--text-primary);
    transition: var(--transition);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--accent-light);
    transition: var(--transition);
}

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

.btn-download {
    padding: 10px 24px;
    background-color: transparent;
    border: 1px solid var(--accent-light);
    color: var(--accent-light);
    border-radius: 4px;
    font-size: 0.9rem;
    transition: var(--transition);
}

.btn-download:hover {
    background-color: var(--accent-light);
    color: var(--bg-dark);
}

/* Hero Section */
.hero {
    height: 100vh;
    min-height: 700px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background-color: #2c211b; /* Fallback */
    /* Create a leather-like gradient background since we don't have real images */
    background: radial-gradient(circle at center, #4a3424 0%, #1a1715 80%);
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml;utf8,<svg viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg"><filter id="noiseFilter"><feTurbulence type="fractalNoise" baseFrequency="0.65" numOctaves="3" stitchTiles="stitch"/></filter><rect width="100%" height="100%" filter="url(%23noiseFilter)" opacity="0.05"/></svg>');
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    padding: 0 20px;
}

.subtitle {
    font-family: var(--font-sans);
    color: var(--accent-light);
    font-size: 1rem;
    letter-spacing: 4px;
    margin-bottom: 20px;
    text-transform: uppercase;
}

.title {
    font-size: 4.5rem;
    line-height: 1.2;
    margin-bottom: 30px;
    color: #fff;
    text-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin: 0 auto 40px;
}

.actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 30px;
}

.btn-primary {
    padding: 16px 40px;
    background-color: var(--accent-brown);
    color: #fff;
    border-radius: 4px;
    font-size: 1.1rem;
    transition: var(--transition);
    border: 1px solid var(--accent-brown);
}

.btn-primary:hover {
    background-color: transparent;
    color: var(--accent-light);
    border-color: var(--accent-light);
}

.btn-text {
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
}

.btn-text:hover {
    color: var(--accent-light);
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 1s ease forwards;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }

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

/* Collection Section */
.collection {
    padding: 120px 40px;
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: 2.5rem;
    color: var(--accent-light);
}

.divider {
    width: 60px;
    height: 2px;
    background-color: var(--accent-brown);
    margin: 20px auto 0;
}

.grid-layout {
    display: grid;
    grid-template-columns: 2fr 1fr;
    grid-template-rows: 1fr 1fr;
    gap: 30px;
    height: 600px;
}

.card {
    position: relative;
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
    background-color: var(--bg-card);
}

.card-large {
    grid-row: 1 / 3;
}

.card-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    transition: transform 0.8s ease;
    opacity: 0.6;
}

/* Simulated leather textures for backgrounds */
.wallet-bg { background: linear-gradient(135deg, #3d2616, #1c110a); }
.bag-bg { background: linear-gradient(135deg, #5c3a21, #2b1b0f); }
.belt-bg { background: linear-gradient(135deg, #422a18, #24160d); }

.card:hover .card-bg {
    transform: scale(1.05);
    opacity: 0.8;
}

.card-content {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 40px;
    background: linear-gradient(to top, rgba(0,0,0,0.9), transparent);
}

.category {
    font-size: 0.8rem;
    color: var(--accent-light);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 10px;
    display: block;
}

.card-content h3 {
    font-size: 1.5rem;
    margin-bottom: 5px;
}

.card-large .card-content h3 {
    font-size: 2.5rem;
}

.card-content p {
    color: var(--text-secondary);
    font-family: var(--font-sans);
}

/* App Preview Mockup (Isometric) */
.app-preview {
    background-color: var(--bg-card);
    padding: 120px 40px;
    border-top: 1px solid rgba(255,255,255,0.05);
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.preview-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 60px;
}

.preview-text {
    flex: 1;
}

.preview-text h2 {
    font-size: 2.5rem;
    margin-bottom: 24px;
}

.preview-text p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 40px;
    max-width: 400px;
}

.feature-list {
    list-style: none;
}

.feature-list li {
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-primary);
}

.feature-list i {
    color: var(--accent-light);
    font-size: 1.2rem;
}

/* The Isometric Mockup completely different from the first app */
.isometric-mockup {
    flex: 1;
    position: relative;
    height: 500px;
    perspective: 1000px;
}

.screen-layer {
    position: absolute;
    width: 280px;
    height: 580px;
    background: #111;
    border-radius: 30px;
    border: 8px solid #333;
    box-shadow: -20px 20px 40px rgba(0,0,0,0.5);
    transition: var(--transition);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.layer-1 {
    transform: rotateX(20deg) rotateY(-20deg) rotateZ(10deg) translateX(40px) translateY(-20px);
    z-index: 1;
    background: #FAF7F2; /* App light theme inside */
    color: #333;
}

.layer-2 {
    transform: rotateX(20deg) rotateY(-20deg) rotateZ(10deg) translateX(-60px) translateY(40px);
    z-index: 2;
    background: #fff;
    color: #333;
}

.isometric-mockup:hover .layer-1 {
    transform: rotateX(25deg) rotateY(-15deg) rotateZ(5deg) translateX(60px) translateY(-40px);
}
.isometric-mockup:hover .layer-2 {
    transform: rotateX(25deg) rotateY(-15deg) rotateZ(5deg) translateX(-80px) translateY(60px);
}

/* Layer 1 content (Category) */
.mock-header { padding: 30px 20px 10px; font-weight: bold; text-align: center; border-bottom: 1px solid #eee; }
.mock-sidebar { width: 80px; float: left; background: #f5f5f5; height: 100%; padding-top: 20px;}
.mock-sidebar div { padding: 15px 10px; font-size: 12px; text-align: center; color: #666;}
.mock-sidebar .active { background: #fff; color: #8B5A33; font-weight: bold; border-left: 3px solid #8B5A33; }
.mock-content { margin-left: 80px; padding: 15px; }
.mock-banner { background: linear-gradient(135deg, #d3b59a, #a67c52); height: 80px; border-radius: 8px; color: white; padding: 10px; font-weight: bold; margin-bottom: 20px;}
.mock-items { display: flex; flex-wrap: wrap; gap: 10px; }
.m-item { width: 45%; height: 60px; background: #eee; border-radius: 4px; }

/* Layer 2 content (Detail) */
.mock-img { height: 300px; background: linear-gradient(to bottom, #5c3a21, #2b1b0f); }
.mock-price { color: #d03050; font-size: 20px; font-weight: bold; padding: 15px 15px 5px; }
.mock-title { padding: 0 15px; font-size: 14px; font-weight: bold; line-height: 1.4; }
.mock-btn { margin: 20px 15px; background: #222; color: #fff; text-align: center; padding: 12px; border-radius: 20px; font-size: 14px;}


/* Craftsmanship */
.craftsmanship {
    padding: 120px 40px;
    background: var(--bg-dark);
}

.craft-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 60px;
    text-align: center;
}

.craft-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 30px;
    border: 1px solid var(--accent-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--accent-light);
}

.craft-item h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.craft-item p {
    color: var(--text-secondary);
}

/* Footer */
.footer {
    background-color: #111;
    border-top: 1px solid #222;
    padding-top: 80px;
}

.footer-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    padding: 0 20px 60px;
}

.footer-content h2 {
    font-size: 2.5rem;
    color: var(--accent-light);
    margin-bottom: 15px;
}

.footer-content p {
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.download-options {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
}

.qr-code {
    width: 120px;
    height: 120px;
    background-color: #fff;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: #111;
}

.app-links {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.btn-store {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 30px;
    background-color: #222;
    border: 1px solid #333;
    border-radius: 4px;
    transition: var(--transition);
}

.btn-store:hover {
    background-color: var(--accent-brown);
    border-color: var(--accent-brown);
}

.footer-bottom {
    background-color: #0a0a0a;
    padding: 30px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: #666;
    font-size: 0.9rem;
}

.footer-bottom .logo {
    font-size: 1.2rem;
}

/* Responsive */
@media (max-width: 992px) {
    .grid-layout {
        grid-template-columns: 1fr;
        height: auto;
    }
    .card-large {
        height: 400px;
    }
    .card-small {
        height: 250px;
    }
    .preview-container {
        flex-direction: column;
        text-align: center;
    }
    .preview-text p {
        margin: 0 auto 40px;
    }
    .feature-list li {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .title { font-size: 3rem; }
    .nav-links { display: none; }
    .craft-container { grid-template-columns: 1fr; gap: 40px; }
    .download-options { flex-direction: column; }
    .footer-bottom { flex-direction: column; gap: 15px; text-align: center; }
}