@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
    --bg-color: #f4f5f7;
    --text-color: #1a1a1a;
    --primary-color: #007aff;
    --card-bg: #ffffff;
    --border-color: #e5e5e5;
    --shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
}

body {
    font-family: 'Inter', sans-serif;
    margin: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 10;
    box-shadow: var(--shadow);
}

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

.logo {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--primary-color);
    text-decoration: none;
}

#nav-auth a, #nav-auth button {
    color: var(--text-color);
    text-decoration: none;
    margin-left: 1.5rem;
    font-weight: 500;
    transition: color 0.2s ease;
}

#nav-auth a:hover {
    color: var(--primary-color);
}

#sign-out-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    font-weight: 500;
}

main {
    padding: 2rem 0;
}

.hero {
    background: linear-gradient(to right, #6a11cb, #2575fc);
    color: white;
    text-align: center;
    padding: 4rem 2rem;
    border-radius: 12px;
    margin-bottom: 2rem;
}

.hero h1 {
    font-size: 2.5rem;
    margin: 0;
}

.section-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 2rem;
    font-weight: 700;
}

#product-listings {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.product-card {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
}

.product-card a {
    text-decoration: none;
    color: inherit;
}

.product-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    display: block;
}

.product-info {
    padding: 1rem;
}

.product-info h3 {
    margin: 0 0 0.5rem 0;
    font-size: 1.1rem;
}

.product-condition {
    font-size: 0.8rem;
    background-color: #eef7ff;
    color: var(--primary-color);
    padding: 0.2rem 0.5rem;
    border-radius: 20px;
    display: inline-block;
    margin-bottom: 0.5rem;
}

.product-price {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--primary-color);
}

footer {
    text-align: center;
    padding: 2rem 0;
    margin-top: 2rem;
    background-color: #e5e5e5;
    color: #666;
}

.hidden {
    display: none !important;
}