/* 1. Import Font & Thiết lập hệ màu High-End */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700&display=swap');

:root {
    /* Palette màu: Xanh Emerald phối với đen Carbon */
    --primary: #00d285;         
    --primary-light: rgba(0, 210, 133, 0.1);
    --bg-body: #f8fafb;        
    --text-main: #1d1d1f;       
    --text-sub: #6e6e73;
    --white: #ffffff;
    
    /* Hiệu ứng chiều sâu */
    --shadow-subtle: 0 8px 32px rgba(0, 0, 0, 0.04);
    --shadow-hover: 0 20px 40px rgba(0, 0, 0, 0.08);
    --radius-lg: 28px;
    --radius-md: 18px;
    --curve: cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: 'Plus Jakarta Sans', sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
    line-height: 1.6;
}

/* 2. Layout - Cân đối hơn */
.container {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 340px; 
    gap: 40px;
    padding: 50px 30px;
}

/* 3. Header - Hiện đại với hiệu ứng Gradient mượt */
header {
    background: linear-gradient(135deg, #1d1d1f 0%, #3a3a3c 100%);
    color: var(--white);
    padding: 120px 20px;
    text-align: center;
    grid-column: 1 / span 2;
    border-radius: var(--radius-lg);
    margin-bottom: 20px;
    box-shadow: var(--shadow-subtle);
}

header h1 {
    font-size: 3.5rem;
    font-weight: 700;
    letter-spacing: -2px;
}

/* 4. Nav - Hiệu ứng Floating Glass (Menu nổi) */
nav {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 15px 40px;
    grid-column: 1 / span 2;
    border-radius: 100px; /* Kiểu capsule hiện đại */
    position: sticky;
    top: 20px;
    z-index: 1000;
    box-shadow: var(--shadow-subtle);
    border: 1px solid rgba(255, 255, 255, 0.4);
    width: fit-content;
    margin: 0 auto 40px;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 40px;
}

nav ul li a {
    text-decoration: none;
    color: var(--text-main);
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--curve);
    opacity: 0.7;
}

nav ul li a:hover {
    color: var(--primary);
    opacity: 1;
}

/* 5. Product Cards - Tối giản & Sang trọng */
.product-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 30px;
}

.product-card {
    background: var(--white);
    border-radius: var(--radius-md);
    padding: 20px;
    transition: var(--curve);
    border: 1px solid rgba(0,0,0,0.02);
    display: flex;
    flex-direction: column;
}

.product-card:hover {
    transform: translateY(-12px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-light);
}

.product-card img {
    width: 100%;
    height: 260px;
    object-fit: cover;
    border-radius: 14px;
    margin-bottom: 20px;
}

.product-card h2 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.product-card .price {
    color: var(--primary);
    font-weight: 700;
    font-size: 1.4rem;
    margin-bottom: 25px;
}

/* 6. Buttons - Thiết kế "Squircle" */
.button {
    background-color: var(--text-main);
    color: var(--white);
    padding: 14px 24px;
    border: none;
    border-radius: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--curve);
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 1px;
}

.button:hover {
    background-color: var(--primary);
    transform: scale(1.03);
    box-shadow: 0 10px 20px var(--primary-light);
}

/* 7. Sidebar - Clean & Sharp */
.sidebar {
    background: var(--white);
    padding: 35px;
    border-radius: var(--radius-lg);
    height: fit-content;
    border: 1px solid rgba(0,0,0,0.03);
}

.sidebar h3 {
    font-size: 1.1rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 25px;
    color: var(--text-sub);
}

.social-icons a {
    color: var(--text-main);
    text-decoration: none;
    display: flex;
    align-items: center;
    padding: 12px 0;
    font-weight: 500;
    border-bottom: 1px solid #f2f2f7;
    transition: var(--curve);
}

.social-icons a:hover {
    color: var(--primary);
    padding-left: 10px;
}

/* 8. Footer - Dark Mode */
.footer {
    background-color: #1d1d1f;
    color: #86868b;
    padding: 80px 40px;
    grid-column: 1 / span 2;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    margin-top: 60px;
}

.footer-item h3 {
    color: var(--white);
    margin-bottom: 20px;
    font-weight: 600;
}

/* Responsive */
@media (max-width: 992px) {
    .container { grid-template-columns: 1fr; }
    nav { width: 90%; padding: 15px 20px; }
    header h1 { font-size: 2.5rem; }
    .footer { grid-template-columns: 1fr; text-align: center; }
}