/* ==========================================================================
   Global Variables & Reset (Based on Pico.css)
   ========================================================================== */
   :root {
    /* Color Palette */
    --pico-background-color: #ffffff;
    --pico-color: #333333;
    --pico-muted-color: #666666;
    --pico-primary: #333333;
    --pico-primary-background: #333333;
    --pico-primary-hover: #000000;
    --pico-primary-inverse: #ffffff;
    --pico-card-background-color: #f8f8f8;
    --pico-border-radius: 0; /* Modern sharp edges */
    
    /* Typography */
    --pico-font-family: "Helvetica Neue", Arial, "Microsoft YaHei", "PingFang SC", "Heiti SC", sans-serif;
    --pico-font-size: 16px;
    --pico-line-height: 1.6;
    
    /* Custom Design Tokens */
    --bg-secondary: #f8f8f8;
    --overlay-color: rgba(255, 255, 255, 0.9);
    --transition-speed: 0.4s;
}

/* Force Light Theme */
@media (prefers-color-scheme: dark) {
    :root {
        --pico-background-color: #ffffff;
        --pico-color: #333333;
    }
}

body {
    margin: 0;
    overflow-x: hidden;
    background-color: var(--pico-background-color);
}

/* Typography Enhancements */
h1, h2, h3, h4, h5, h6 {
    font-weight: 500;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
}
p {
    margin-bottom: 1.5rem;
    font-weight: 400;
}
a {
    text-decoration: none;
    color: var(--pico-color);
    transition: opacity 0.2s;
}
a:hover {
    opacity: 0.7;
    text-decoration: none;
}

/* ==========================================================================
   Components: Navigation
   ========================================================================== */
nav.container-fluid {
    padding: 1.5rem 4%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid transparent;
    transition: border-color 0.3s;
}
nav.scrolled {
    border-bottom: 1px solid #f0f0f0;
}
nav ul li a {
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.15em;
    padding: 0.5rem 0;
    position: relative;
}
nav ul li a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background-color: var(--pico-color);
}

/* ==========================================================================
   Components: Hero Carousel
   ========================================================================== */
.hero-section {
    position: relative;
    height: 90vh;
    width: 100%;
    overflow: hidden;
    margin-bottom: 4rem;
}
.carousel-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1.5s ease-in-out;
    background-size: cover;
    background-position: center top;
}
.carousel-slide.active {
    opacity: 1;
}

/* ==========================================================================
   Components: Collection Grid
   ========================================================================== */
.section-title {
    text-align: center;
    margin: 4rem 0 2rem;
    font-size: 1.5rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--pico-muted-color);
}
.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
    padding: 0 4% 4rem;
}
.collection-card {
    position: relative;
    aspect-ratio: 3/4;
    overflow: hidden;
    background-color: var(--bg-secondary);
    cursor: default;
}
.collection-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    display: block;
}
.collection-card:hover img {
    transform: scale(1.06);
}
.card-details {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 2rem;
    background: linear-gradient(to top, rgba(255,255,255,0.95) 0%, rgba(255,255,255,0.8) 50%, transparent 100%);
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.4s ease;
}
.collection-card:hover .card-details {
    opacity: 1;
    transform: translateY(0);
}
.card-details h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}
.card-details p {
    font-size: 0.9rem;
    color: var(--pico-muted-color);
    margin: 0;
    line-height: 1.4;
}

/* ==========================================================================
   Components: Philosophy Section
   ========================================================================== */
.philosophy-wrapper {
    display: flex;
    flex-wrap: wrap;
    align-items: stretch;
    min-height: 80vh;
}
.philosophy-content {
    flex: 1 1 500px;
    padding: 6rem 8%;
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.philosophy-visual {
    flex: 1 1 500px;
    background-size: cover;
    background-position: center;
    min-height: 400px;
}
.quote {
    font-size: 1.25rem;
    font-style: italic;
    color: var(--pico-muted-color);
    border-left: 2px solid var(--pico-color);
    padding-left: 1.5rem;
    margin: 2rem 0;
}

/* ==========================================================================
   Utilities & Footer
   ========================================================================== */
footer {
    padding: 3rem 0;
    text-align: center;
    font-size: 0.8rem;
    color: #999;
    border-top: 1px solid #eee;
    margin-top: auto;
}
.fade-in-up {
    animation: fadeInUp 0.8s ease-out forwards;
    opacity: 0;
}
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Skeleton Loading */
.skeleton {
    background: #f0f0f0;
    position: relative;
    overflow: hidden;
}
.skeleton::after {
    content: "";
    position: absolute;
    top: 0; right: 0; bottom: 0; left: 0;
    transform: translateX(-100%);
    background: linear-gradient(90deg, rgba(255,255,255,0) 0, rgba(255,255,255,0.5) 50%, rgba(255,255,255,0) 100%);
    animation: shimmer 1.5s infinite;
}
@keyframes shimmer {
    100% { transform: translateX(100%); }
}

/* Responsive */
@media (max-width: 768px) {
    .grid-container {
        grid-template-columns: 1fr;
        padding: 0 1rem 2rem;
    }
    .hero-section {
        height: 70vh;
    }
    .philosophy-content {
        padding: 4rem 1.5rem;
    }
    nav ul {
        justify-content: space-around;
        width: 100%;
    }
}