/* CSS Variables for Light Theme & Glassmorphism */
:root {
    --primary-color: #0066ff;
    --primary-hover: #005ce6;
    --secondary-color: #ff3366;
    --bg-color: #f4f7f6;
    --text-main: #2d3748;
    --text-muted: #718096;
    --card-bg: rgba(255, 255, 255, 0.85);
    --nav-bg: rgba(255, 255, 255, 0.7);
    --border-color: rgba(255, 255, 255, 0.4);
    --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 15px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 25px rgba(0, 0, 0, 0.1);
    --radius-md: 12px;
    --radius-lg: 20px;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, #fdfbfb 0%, #ebedee 100%);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Glassmorphism Header */
header {
    background: var(--nav-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    padding: 15px 30px;
    position: sticky;
    top: 0;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    font-size: 1.8rem;
    font-weight: 800;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin: 0;
}

nav {
    display: flex;
    gap: 25px;
    align-items: center;
    flex-wrap: nowrap;
}

nav a, #react-cart-header {
    color: var(--text-main);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition);
    padding: 8px 12px;
    border-radius: var(--radius-md);
    white-space: nowrap;
}

nav a:hover {
    background: rgba(0, 102, 255, 0.1);
    color: var(--primary-color);
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 10px rgba(0, 102, 255, 0.3);
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(0, 102, 255, 0.4);
}

.btn-secondary {
    background: white;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-secondary:hover {
    background: rgba(0, 102, 255, 0.05);
    transform: translateY(-2px);
}

/* Glass Card */
.glass-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 25px;
    transition: var(--transition);
}

.glass-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

/* Main Content */
main {
    flex: 1;
    padding: 40px 30px;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* Footer */
footer {
    text-align: center;
    padding: 30px;
    color: var(--text-muted);
    font-size: 0.9rem;
    border-top: 1px solid rgba(0,0,0,0.05);
    margin-top: auto;
}

/* Forms */
input[type="text"], input[type="password"], input[type="email"], input[type="number"] {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #e2e8f0;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
    background: rgba(255, 255, 255, 0.9);
}

input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.2);
}