/* 
   One Gem Limited - High-End E-Commerce Design System 
   Premium Aesthetics & Responsive Design
*/

:root {
    /* Color Palette */
    --primary-color: #0c1220;
    /* Deep Midnight Blue */
    --secondary-color: #1a2639;
    /* Rich Navy */
    --accent-color: #d4af37;
    /* Metallic Gold */
    --accent-hover: #bfa13d;
    --text-light: #f4f7f6;
    --text-muted: #a0aab5;
    --white: #ffffff;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);

    /* Typography */
    --font-heading: 'Playfair Display', serif;
    --font-body: 'Inter', sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;

    /* Transitions */
    --transition-fast: 0.3s ease;
    --transition-smooth: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    color: var(--white);
    font-weight: 700;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-fast);
}

ul {
    list-style: none;
}

/* Utilities */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: transparent;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 2px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition-fast);
    position: relative;
    overflow: hidden;
}

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

.btn-primary {
    background: var(--accent-color);
    color: var(--primary-color);
}

.btn-primary:hover {
    background: var(--white);
    border-color: var(--white);
}

/* Header */
header {
    padding: var(--spacing-sm) 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    background: rgba(12, 18, 32, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
    transition: background 0.3s ease;
}

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

.logo {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    color: var(--white);
    letter-spacing: 1px;
    font-style: italic;
}

.logo span {
    color: var(--accent-color);
    font-style: normal;
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
}

.nav-links a {
    color: var(--text-muted);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--accent-color);
}

.nav-icons {
    display: flex;
    gap: var(--spacing-sm);
    color: var(--white);
    font-size: 1.2rem;
    cursor: pointer;
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: 80px;
    position: relative;
    overflow: hidden;
    /* Deep luxurious gradient since image gen failed */
    background: radial-gradient(circle at 30% 30%, #1b2a45 0%, #080c15 80%);
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 80% 20%, rgba(65, 105, 225, 0.1) 0%, transparent 40%),
        radial-gradient(circle at 20% 80%, rgba(212, 175, 55, 0.05) 0%, transparent 40%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    animation: fadeInUp 1.2s ease-out;
}

.hero h1 {
    font-size: clamp(3rem, 5vw, 5rem);
    margin-bottom: var(--spacing-sm);
    line-height: 1.1;
    text-shadow: 0 4px 10px rgba(0, 0, 0, 0.5);
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Featured Collections */
.featured {
    padding: var(--spacing-xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-header h2 {
    font-size: 3rem;
    margin-bottom: var(--spacing-xs);
}

.section-header p {
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 3px;
    font-size: 0.9rem;
}

.collection-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.collection-card {
    position: relative;
    height: 450px;
    background: var(--secondary-color);
    border: 1px solid var(--glass-border);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.collection-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.4);
    border-color: var(--accent-color);
}

.collection-image {
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    transition: transform 0.8s ease;
    filter: brightness(0.8);
}

/* Specific gemstone gradients/images */
.img-sapphire {
    /* Deep Royal Blue Gradient */
    background-image: url('images/cornflower.jpg');
}

.img-padparadscha {
    /* Pink-Orange Gradient */
    background-image: url('images/padparadscha.jpg');
}

.img-spinel {
    /* Ruby Red/Magenta Gradient */
    background-image: url('images/red_spinel.jpg');
}

.collection-card:hover .collection-image {
    transform: scale(1.1);
    filter: brightness(1);
}

.collection-info {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: var(--spacing-md);
    background: linear-gradient(to top, rgba(12, 18, 32, 0.95), transparent);
    z-index: 2;
}

.collection-info h3 {
    font-size: 1.8rem;
    margin-bottom: var(--spacing-xs);
}

.collection-info p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Key Features / Values */
.values {
    padding: var(--spacing-xl) 0;
    background: var(--secondary-color);
    text-align: center;
    position: relative;
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.value-item {
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--glass-border);
    transition: var(--transition-fast);
}

.value-item:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--accent-color);
}

.value-item i {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: var(--spacing-sm);
}

.value-item h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.value-item p {
    color: var(--text-muted);
}

/* Footer */
footer {
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    border-top: 1px solid var(--glass-border);
    background: #080c15;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-brand .logo {
    margin-bottom: var(--spacing-sm);
    display: inline-block;
}

.footer-brand p {
    color: var(--text-muted);
    margin-top: var(--spacing-sm);
    font-size: 0.9rem;
    line-height: 1.6;
}

.footer-col h4 {
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
    letter-spacing: 1px;
    color: var(--white);
}

.footer-col ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-col a {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-col a:hover {
    color: var(--accent-color);
    padding-left: 5px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--glass-border);
    color: var(--text-muted);
    font-size: 0.8rem;
    align-items: center;
}

.payment-methods {
    font-size: 1.5rem;
    display: flex;
    gap: 10px;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

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

/* Mobile Responsiveness */
@media (max-width: 900px) {
    .h1 {
        font-size: 3rem;
    }

    .nav-links {
        display: none;
    }

    /* Add burger menu later */
    .values-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .hero {
        padding-top: 60px;
    }
}

/* Product Images - Real Gemstones (Downloaded) */
.collection-image,
.product-image {
    position: relative;
    overflow: hidden;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.5);
}

.collection-image::after,
.product-image::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.4) 0%, transparent 20%);
    pointer-events: none;
    mix-blend-mode: overlay;
}

.p-cornflower {
    background-image: url('images/cornflower.jpg'), conic-gradient(from 45deg at 50% 50%, #2b6cb0, #4a89dc, #2b6cb0, #4a89dc);
}

.p-padparadscha {
    background-image: url('images/padparadscha.jpg'), conic-gradient(from 45deg at 50% 50%, #ff6b6b, #ff9a9e, #fad0c4, #ff6b6b);
}

.p-spinel-red {
    background-image: url('images/red_spinel.jpg'), conic-gradient(from 45deg at 50% 50%, #990000, #ff416c, #ff4b2b, #ff416c, #990000);
}

.p-yellow {
    background-image: url('images/yellow_sapphire.jpg'), conic-gradient(from 45deg at 50% 50%, #b7791f, #f6e05e, #fda085, #f6e05e, #b7791f);
}

.p-alexandrite {
    background-image: url('images/alexandrite.jpg'), conic-gradient(from 45deg at 50% 50%, #2c5282, #38b2ac, #553c9a, #38b2ac);
}

.p-pink {
    background-image: url('images/pink_sapphire.jpg'), conic-gradient(from 45deg at 50% 50%, #b83280, #ff758c, #ff7eb3, #ff758c, #b83280);
}

.p-sapphire-royal {
    background-image: url('images/royal_sapphire.jpg'), conic-gradient(from 45deg at 50% 50%, #000c24, #002366, #0044cc, #002366, #000c24);
}

.p-padparadscha-deep {
    background-image: url('images/deep_padparadscha.jpg'), conic-gradient(from 45deg at 50% 50%, #d84315, #ff7043, #ffab91, #ff7043, #d84315);
    filter: saturate(1.3) contrast(1.1);
}

.p-spinel-blue {
    background-image: url('images/cobalt_spinel.jpg'), conic-gradient(from 45deg at 50% 50%, #000080, #0047ab, #4169e1, #0047ab, #000080);
}

.p-sapphire-teal {
    background-image: url('images/royal_sapphire.jpg'), conic-gradient(from 45deg at 50% 50%, #004d4d, #008080, #20b2aa, #008080, #004d4d);
    filter: hue-rotate(-50deg) brightness(1.1);
}

/* Helper for child background div (used in Shop) */
.img-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    z-index: 0;
}

/* New Variations via CSS Filters */
.p-white {
    background-image: url('images/royal_sapphire.jpg');
    filter: grayscale(1) brightness(1.2);
}

.p-violet {
    background-image: url('images/cornflower.jpg');
    filter: hue-rotate(40deg);
}

.p-purple {
    background-image: url('images/pink_sapphire.jpg');
    filter: hue-rotate(-20deg) saturate(0.8);
}

.p-green {
    background-image: url('images/yellow_sapphire.jpg');
    filter: hue-rotate(90deg) brightness(0.9);
}

.p-parti {
    background-image: url('images/yellow_sapphire.jpg');
    filter: hue-rotate(180deg) contrast(1.2);
}