/* =============================================
   尼可宝 NEKOBOT — 智能猫砂盆官网
   Style System
   ============================================= */

:root {
    --primary: #4F46E5;
    --primary-light: #818CF8;
    --primary-dark: #3730A3;
    --accent: #F59E0B;
    --accent-light: #FCD34D;
    --bg: #FAFBFF;
    --bg-card: #FFFFFF;
    --bg-dark: #0F172A;
    --text: #1E293B;
    --text-secondary: #64748B;
    --text-light: #94A3B8;
    --border: #E2E8F0;
    --radius: 16px;
    --radius-sm: 10px;
    --radius-lg: 24px;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
    --shadow-md: 0 8px 30px rgba(0,0,0,0.08);
    --shadow-lg: 0 20px 60px rgba(0,0,0,0.12);
    --shadow-glow: 0 0 40px rgba(79,70,229,0.2);
    --font: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { scroll-behavior: smooth; font-size: 16px; -webkit-font-smoothing: antialiased; }

body { font-family: var(--font); color: var(--text); background: var(--bg); line-height: 1.7; overflow-x: hidden; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    gap: 8px; padding: 12px 28px; border-radius: var(--radius-sm);
    font-weight: 600; font-size: 15px; cursor: pointer;
    transition: var(--transition); border: 2px solid transparent; font-family: var(--font);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff; border-color: transparent;
    box-shadow: 0 4px 16px rgba(79,70,229,0.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(79,70,229,0.4); }

.btn-outline { background: transparent; color: var(--primary); border-color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; }

.btn-lg { padding: 16px 36px; font-size: 16px; border-radius: var(--radius); }
.btn-block { width: 100%; }

/* ---------- Navbar ---------- */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    padding: 12px 0; transition: var(--transition);
    background: rgba(255,255,255,0.92); backdrop-filter: blur(20px);
    box-shadow: var(--shadow-sm);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; }

.logo { display: flex; align-items: center; gap: 10px; }
.logo-img { height: 44px; width: auto; object-fit: contain; border-radius: 4px; }
.logo-footer { height: 36px; }
.logo-sub { font-size: 12px; color: var(--text-secondary); letter-spacing: 2px; font-weight: 600; }

.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a { font-size: 14px; font-weight: 500; color: var(--text-secondary); transition: var(--transition); position: relative; }
.nav-links a:hover { color: var(--primary); }
.nav-links a::after {
    content: ''; position: absolute; bottom: -4px; left: 0;
    width: 0; height: 2px; background: var(--primary); transition: var(--transition);
}
.nav-links a:hover::after { width: 100%; }

.btn-nav {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff !important; padding: 8px 20px; border-radius: var(--radius-sm); font-weight: 600;
}
.btn-nav::after { display: none !important; }
.btn-nav:hover { transform: translateY(-1px); box-shadow: 0 4px 16px rgba(79,70,229,0.3); }

.hamburger { display: none; background: none; border: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; }
.hamburger span { display: block; width: 24px; height: 2px; background: var(--text); border-radius: 2px; transition: var(--transition); }

/* ---------- Hero ---------- */
.hero {
    min-height: 100vh; display: flex; align-items: center;
    position: relative; overflow: hidden; padding-top: 80px;
    background: linear-gradient(135deg, #FAFAFF, #F0F0FF, #EDE9FE);
}

.hero-bg-shapes { position: absolute; inset: 0; pointer-events: none; overflow: hidden; }

.shape { position: absolute; border-radius: 50%; filter: blur(80px); opacity: 0.35; }
.shape-1 { width: 600px; height: 600px; background: linear-gradient(135deg, #818CF8, #4F46E5); top: -200px; right: -100px; animation: float 8s ease-in-out infinite; }
.shape-2 { width: 400px; height: 400px; background: linear-gradient(135deg, #FCD34D, #F59E0B); bottom: -100px; left: -100px; animation: float 10s ease-in-out infinite reverse; }
.shape-3 { width: 300px; height: 300px; background: linear-gradient(135deg, #34D399, #10B981); top: 50%; left: 40%; animation: float 12s ease-in-out infinite; }

@keyframes float { 0%, 100% { transform: translate(0, 0); } 50% { transform: translate(30px, -30px); } }

.hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; position: relative; z-index: 1; }

.hero-tag {
    display: inline-block;
    background: linear-gradient(135deg, rgba(79,70,229,0.1), rgba(129,140,248,0.1));
    color: var(--primary); padding: 6px 16px; border-radius: 20px;
    font-size: 14px; font-weight: 600; margin-bottom: 20px;
    border: 1px solid rgba(79,70,229,0.15);
}

.hero-title { font-size: 52px; font-weight: 900; line-height: 1.15; margin-bottom: 24px; letter-spacing: -1px; }

.gradient-text {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

.hero-desc { font-size: 18px; color: var(--text-secondary); margin-bottom: 36px; line-height: 1.8; }
.hero-actions { display: flex; gap: 16px; margin-bottom: 48px; flex-wrap: wrap; }
.hero-actions .btn span { background: rgba(255,255,255,0.2); padding: 2px 8px; border-radius: 6px; font-size: 13px; margin-left: 4px; }

.hero-stats { display: flex; gap: 40px; }
.stat { text-align: center; }
.stat-num { font-size: 36px; font-weight: 900; color: var(--primary-dark); display: inline; }
.stat-suffix { font-size: 18px; font-weight: 700; color: var(--primary-light); }
.stat-label { display: block; font-size: 13px; color: var(--text-secondary); margin-top: 4px; }

/* Hero Visual */
.hero-visual { display: flex; justify-content: center; align-items: center; }
.product-showcase { position: relative; width: 420px; }

.hero-product-img {
    width: 100%; max-width: 380px; margin: 0 auto;
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    animation: heroFloat 4s ease-in-out infinite;
}
.hero-product-img img { width: 100%; height: auto; }

@keyframes heroFloat { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }

.float-badge {
    position: absolute; background: var(--bg-card); padding: 10px 18px;
    border-radius: var(--radius-sm); box-shadow: var(--shadow-md);
    font-size: 14px; font-weight: 600; display: flex; align-items: center; gap: 8px;
    animation: floatBadge 4s ease-in-out infinite;
}
.float-badge-1 { top: 20px; left: -10px; animation-delay: 0s; }
.float-badge-2 { top: 80px; right: -10px; animation-delay: 1.3s; }
.float-badge-3 { bottom: 40px; left: 0; animation-delay: 2.6s; }
.badge-icon { font-size: 20px; }

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

.scroll-hint { position: absolute; bottom: 40px; left: 50%; transform: translateX(-50%); text-align: center; color: var(--text-light); font-size: 13px; }
.scroll-arrow { width: 20px; height: 20px; border-right: 2px solid var(--text-light); border-bottom: 2px solid var(--text-light); transform: rotate(45deg); margin: 8px auto 0; animation: scrollDown 1.5s ease-in-out infinite; }

@keyframes scrollDown { 0% { opacity: 0; transform: rotate(45deg) translateY(-5px); } 50% { opacity: 1; } 100% { opacity: 0; transform: rotate(45deg) translateY(5px); } }

/* ---------- Section Common ---------- */
.section { padding: 100px 0; }
.section-header { text-align: center; margin-bottom: 60px; }
.section-tag {
    display: inline-block;
    background: linear-gradient(135deg, rgba(79,70,229,0.1), rgba(129,140,248,0.1));
    color: var(--primary); padding: 6px 16px; border-radius: 20px;
    font-size: 13px; font-weight: 600; margin-bottom: 16px;
    border: 1px solid rgba(79,70,229,0.15);
}
.section-title { font-size: 38px; font-weight: 900; margin-bottom: 12px; letter-spacing: -0.5px; }
.section-desc { font-size: 17px; color: var(--text-secondary); }

/* ---------- Single Product ---------- */
.products { background: linear-gradient(180deg, var(--bg) 0%, #F0F0FF 100%); }

.single-product-wrap { max-width: 900px; margin: 0 auto; }

.single-product-card {
    display: grid; grid-template-columns: 1fr 1fr;
    background: var(--bg-card); border-radius: var(--radius-lg);
    overflow: hidden; border: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
}

.sp-image { position: relative; background: linear-gradient(135deg, #F5F3FF, #EDE9FE); display: flex; align-items: center; justify-content: center; padding: 35px; min-height: 380px; }
.sp-image img { width: 100%; max-width: 300px; height: auto; border-radius: 12px; box-shadow: var(--shadow-md); }
.sp-badge { position: absolute; top: 20px; right: 20px; background: var(--bg-card); padding: 6px 14px; border-radius: 20px; font-size: 12px; font-weight: 700; }
.sp-badge.hot { background: #FEF3C7; color: #D97706; }

.sp-info { padding: 40px; display: flex; flex-direction: column; justify-content: center; }
.sp-name { font-size: 24px; font-weight: 900; margin-bottom: 6px; }
.sp-tagline { font-size: 14px; color: var(--text-secondary); margin-bottom: 24px; }

.sp-features { margin-bottom: 24px; }
.sp-features li { padding: 7px 0; font-size: 14px; display: flex; align-items: center; gap: 10px; }
.check { color: #10B981; font-weight: 700; font-size: 16px; }

.sp-price { display: flex; align-items: baseline; gap: 12px; margin-bottom: 20px; }
.price-current { font-size: 32px; font-weight: 900; color: #EF4444; }
.price-original { font-size: 16px; color: var(--text-light); text-decoration: line-through; }
.price-tag { font-size: 13px; background: #DCFCE7; color: #15803D; padding: 3px 10px; border-radius: 20px; font-weight: 600; }

.sp-note { font-size: 12px; color: var(--text-light); text-align: center; margin-top: 10px; }

/* ---------- Product Gallery ---------- */
.product-gallery { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 40px; }
.gallery-item { border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); position: relative; background: var(--bg-card); }
.gallery-item img { width: 100%; height: 200px; object-fit: cover; transition: var(--transition); cursor: pointer; }
.gallery-item:hover img { transform: scale(1.05); }
.gallery-item span { position: absolute; bottom: 0; left: 0; right: 0; background: linear-gradient(transparent, rgba(0,0,0,0.6)); color: #fff; padding: 30px 16px 12px; font-size: 13px; font-weight: 600; }

/* ---------- Accessories ---------- */
.accessories { background: linear-gradient(180deg, #F0F0FF 0%, var(--bg) 100%); }

.accessories-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }

.accessory-card {
    background: var(--bg-card); border-radius: var(--radius-lg);
    overflow: hidden; border: 1px solid var(--border);
    transition: var(--transition); display: flex; flex-direction: column;
}
.accessory-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }

.ac-img { background: linear-gradient(135deg, #F8F4FF, #EDE9FE); display: flex; align-items: center; justify-content: center; padding: 30px; height: 220px; }
.ac-img img { width: 100%; max-width: 200px; height: auto; object-fit: contain; }

.ac-info { padding: 28px; flex: 1; display: flex; flex-direction: column; }
.ac-tag { display: inline-block; padding: 4px 12px; border-radius: 20px; font-size: 12px; font-weight: 700; background: #EDE9FE; color: var(--primary); margin-bottom: 10px; width: fit-content; }
.ac-tag.hot { background: #FEF3C7; color: #D97706; }

.ac-info h3 { font-size: 18px; font-weight: 800; margin-bottom: 8px; line-height: 1.4; }
.ac-desc { font-size: 13px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 16px; flex: 1; }
.ac-price { display: flex; align-items: baseline; gap: 10px; margin-bottom: 16px; }

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

.feature-card {
    background: var(--bg-card); padding: 36px; border-radius: var(--radius);
    border: 1px solid var(--border); transition: var(--transition); text-align: center;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--primary-light); }
.feature-icon { font-size: 48px; margin-bottom: 16px; }
.feature-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.feature-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }

/* ---------- Reviews ---------- */
.reviews { background: linear-gradient(180deg, #F0F0FF 0%, var(--bg) 100%); }
.reviews-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }

.review-card {
    background: var(--bg-card); padding: 32px; border-radius: var(--radius);
    border: 1px solid var(--border); transition: var(--transition);
}
.review-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.review-stars { color: #F59E0B; font-size: 16px; margin-bottom: 16px; letter-spacing: 2px; }
.review-text { font-size: 15px; line-height: 1.8; color: var(--text); margin-bottom: 20px; font-style: italic; }
.review-author { display: flex; align-items: center; gap: 12px; }
.avatar { width: 44px; height: 44px; border-radius: 50%; background: linear-gradient(135deg, #EDE9FE, #DDD6FE); display: flex; align-items: center; justify-content: center; font-size: 22px; }
.author-name { font-weight: 700; font-size: 14px; }
.author-info { font-size: 12px; color: var(--text-light); }

/* ---------- FAQ ---------- */
.faq-list { max-width: 720px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-question {
    width: 100%; background: none; border: none; padding: 20px 0;
    display: flex; align-items: center; justify-content: space-between;
    cursor: pointer; font-size: 16px; font-weight: 600; font-family: var(--font);
    color: var(--text); text-align: left; transition: var(--transition);
}
.faq-question:hover { color: var(--primary); }
.faq-arrow { font-size: 20px; transition: var(--transition); color: var(--text-light); }
.faq-item.active .faq-arrow { transform: rotate(90deg); color: var(--primary); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.4s ease, padding 0.4s ease; }
.faq-item.active .faq-answer { max-height: 300px; padding-bottom: 20px; }
.faq-answer p { font-size: 15px; color: var(--text-secondary); line-height: 1.8; }

/* ---------- CTA ---------- */
.cta {
    background: linear-gradient(135deg, #4F46E5, #3730A3);
    color: #fff; padding: 80px 0;
}
.cta-card { display: flex; align-items: center; justify-content: space-between; gap: 60px; }
.cta-content { flex: 1; }
.cta-content h2 { font-size: 34px; font-weight: 900; margin-bottom: 12px; }
.cta-content > p { font-size: 16px; opacity: 0.85; margin-bottom: 28px; }
.cta-form { display: flex; flex-direction: column; gap: 12px; }

.form-input {
    padding: 14px 18px; border-radius: var(--radius-sm);
    border: 2px solid rgba(255,255,255,0.2); background: rgba(255,255,255,0.1);
    color: #fff; font-size: 15px; font-family: var(--font);
    transition: var(--transition); backdrop-filter: blur(4px);
}
.form-input::placeholder { color: rgba(255,255,255,0.5); }
.form-input:focus { outline: none; border-color: var(--accent); background: rgba(255,255,255,0.15); }
.form-input option { color: #1E293B; }

.cta .btn-primary { background: linear-gradient(135deg, var(--accent), #D97706); box-shadow: 0 4px 16px rgba(245,158,11,0.3); }
.cta .btn-primary:hover { box-shadow: 0 8px 24px rgba(245,158,11,0.4); }
.cta-note { font-size: 12px; opacity: 0.6; margin-top: 12px; text-align: center; }

.cta-decoration { font-size: 120px; position: relative; flex-shrink: 0; }
.cta-cat { animation: floatBadge 3s ease-in-out infinite; }
.cta-paw { position: absolute; top: -30px; right: -40px; font-size: 50px; opacity: 0.4; animation: floatBadge 5s ease-in-out infinite reverse; }

/* ---------- Footer ---------- */
.footer { background: var(--bg-dark); color: rgba(255,255,255,0.7); padding: 60px 0 30px; }
.footer-inner { display: grid; grid-template-columns: 1.5fr 2fr; gap: 60px; }
.footer-brand .logo-sub { color: rgba(255,255,255,0.5); }
.footer-desc { margin-top: 16px; font-size: 14px; line-height: 1.8; opacity: 0.7; }
.footer-links { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.footer-col h4 { color: #fff; font-size: 15px; margin-bottom: 16px; }
.footer-col a { display: block; font-size: 14px; margin-bottom: 10px; opacity: 0.6; transition: var(--transition); }
.footer-col a:hover { opacity: 1; color: var(--primary-light); }
.footer-bottom { grid-column: 1 / -1; display: flex; justify-content: space-between; align-items: center; padding-top: 30px; border-top: 1px solid rgba(255,255,255,0.1); margin-top: 20px; }
.footer-bottom p { font-size: 13px; opacity: 0.5; }
.social-links { display: flex; gap: 16px; }
.social-links a { font-size: 20px; opacity: 0.6; transition: var(--transition); }
.social-links a:hover { opacity: 1; transform: scale(1.2); }

/* ---------- Animations ---------- */
.fade-in { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
    .hero-inner { grid-template-columns: 1fr; text-align: center; }
    .hero-visual { display: none; }
    .hero-actions { justify-content: center; }
    .hero-stats { justify-content: center; }
    .hero-title { font-size: 44px; }
    .single-product-card { grid-template-columns: 1fr; }
    .sp-image { min-height: 280px; }
    .sp-image img { max-width: 280px; }
    .product-gallery { grid-template-columns: repeat(2, 1fr); }
    .accessories-grid { grid-template-columns: repeat(2, 1fr); }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .reviews-grid { grid-template-columns: 1fr; max-width: 480px; margin: 0 auto; }
    .cta-card { flex-direction: column; text-align: center; }
    .cta-decoration { display: none; }
    .footer-inner { grid-template-columns: 1fr; gap: 40px; }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .hamburger { display: flex; }
    .nav-links.open { display: flex; flex-direction: column; position: absolute; top: 100%; left: 0; right: 0; background: rgba(255,255,255,0.98); backdrop-filter: blur(20px); padding: 20px; box-shadow: var(--shadow-md); gap: 16px; }
    .hero-title { font-size: 34px; }
    .section-title { font-size: 28px; }
    .features-grid { grid-template-columns: 1fr; }
    .accessories-grid { grid-template-columns: 1fr; }
    .footer-links { grid-template-columns: repeat(3, 1fr); gap: 20px; }
}

@media (max-width: 480px) {
    .hero-title { font-size: 28px; }
    .hero-desc { font-size: 15px; }
    .hero-stats { gap: 20px; }
    .stat-num { font-size: 28px; }
    .product-gallery { grid-template-columns: 1fr; }
    .cta-content h2 { font-size: 24px; }
    .footer-links { grid-template-columns: 1fr 1fr; }
}

/* ---------- 图片放大灯箱 ---------- */
.lightbox {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.88);
    z-index: 9999;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    cursor: pointer;
    padding: 20px;
}
.lightbox.open {
    display: flex;
}
.lightbox img {
    max-width: 90vw;
    max-height: 80vh;
    object-fit: contain;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.5);
    cursor: default;
}
.lightbox-close {
    position: absolute;
    top: 20px;
    right: 24px;
    background: rgba(255,255,255,0.15);
    border: 2px solid rgba(255,255,255,0.3);
    color: #fff;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    font-family: var(--font);
}
.lightbox-close:hover {
    background: rgba(255,255,255,0.25);
    border-color: rgba(255,255,255,0.5);
    transform: rotate(90deg);
}
.lightbox-caption {
    color: rgba(255,255,255,0.7);
    margin-top: 16px;
    font-size: 15px;
    text-align: center;
    cursor: default;
}

/* 点击图册卡片指针样式 */
.product-gallery .gallery-item { cursor: zoom-in; }