:root {
    --primary: #45c2ef;
    --primary-dark: #4f46e5;
    --secondary: #0f172a;
    --text: #334155;
    --light: #f8fafc;
    --accent: #f59e0b;
}
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    margin: 0;
    color: var(--text);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}
header, footer {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
}
header {
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: all 0.3s ease;
}
nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.nav-menu {
    display: flex;
    gap: 2rem;
    align-items: center;
}
.nav-menu a {
    color: var(--text);
    text-decoration: none;
    transition: all 0.3s ease;
    position: relative;
    font-weight: 500;
}
.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width 0.3s ease;
}
.nav-menu a:hover::after { width: 100%; }
.nav-right {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}
.cart-icon { position: relative; cursor: pointer; transition: transform 0.3s ease; }
.cart-icon svg { color: var(--text); width: 28px; height: 28px; }
.cart-icon:hover { transform: scale(1.1); }
.cart-count {
    position: absolute; top: -8px; right: -8px; background: var(--accent);
    color: rgb(0, 0, 0); border-radius: 50%; width: 20px; height: 20px;
    display: flex; align-items: center; justify-content: center;
    font-size: 0.75rem; font-weight: bold;
}
.cart-count.pulse { animation: pulse 0.5s ease; }
@keyframes pulse { 0%{transform:scale(1)}50%{transform:scale(1.2)}100%{transform:scale(1)} }
.hamburger-menu { display: none; cursor: pointer; z-index: 101; padding: 0.5rem; position: relative; }
.hamburger-menu .bar { display:block; width:25px; height:3px; margin:5px auto; background-color: var(--secondary); transition: all 0.3s ease-in-out; border-radius: 2px; }
.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
}
.footer-grid {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}
.footer-section h3 { color: var(--secondary); margin-bottom: 1rem; }
.footer-section ul { list-style: none; padding: 0; margin: 0; }
.footer-section ul li { margin-bottom: 0.5rem; }
.footer-section ul li a { color: var(--text); text-decoration: none; transition: color 0.3s ease; }
.footer-section ul li a:hover { color: var(--primary); }
.social-links { display: flex; gap: 1rem; margin-top: 1rem; }
.social-links a { width: 40px; height: 40px; background: #f1f5f9; color: var(--text); border-radius: 50%;
    display:flex; align-items:center; justify-content:center; transition: all .3s; }
.social-links a:hover { transform: translateY(-5px); background: var(--primary); color: white; }
.footer-bottom { text-align: center; border-top: 1px solid #e5e7eb; padding: 1.25rem 0 1.5rem; margin-top: 2rem; }
a.logo {
    font-weight: 800;
    text-decoration: none;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    -webkit-background-clip: text; background-clip: text;
    -webkit-text-fill-color: transparent;
    font-size: 2.2rem;
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}
.logo-img {
    height: 2.5rem;
    width: auto;
    object-fit: contain;
    display: block;
}
a.logo::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--primary-dark));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}
a.logo:hover::after {
    transform: scaleX(1);
}
a.logo:hover {
    transform: translateY(-1px);
    transition: transform 0.2s ease;
}
.modal {
    display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.8); backdrop-filter: blur(5px); z-index: 1000;
}
.modal.active { display: flex; align-items: center; justify-content: center; }
.modal-content {
    background: white; border-radius: 20px; padding: 2rem; max-width: 500px; width: 90%; position: relative;
}

/* Mobile: Instant modal appearance */
@media (max-width: 768px) {
    .modal.active {
        align-items: flex-end;
        justify-content: stretch;
    }
    
    .modal-content {
        max-width: 100%;
        width: 100%;
        border-radius: 20px 20px 0 0;
        max-height: 90vh;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        padding: 1.5rem;
        margin: 0;
    }
}
.close-modal { position: absolute; top: 1rem; right: 1rem; background: none; border: none; font-size: 2rem; cursor: pointer; color: #999; }
.cart-item { display: flex; justify-content: space-between; align-items: center; padding: .75rem 0; border-bottom: 1px solid #e5e7eb; }
.cart-item:last-child { border-bottom: none; }
.remove-item { background: none; border: none; color: #9ca3af; font-size: 1.25rem; cursor: pointer; margin-left: .75rem; }
.cart-total { display: flex; justify-content: space-between; align-items: center; font-size: 1.2rem; }
.toast {
    position: fixed; bottom: 2rem; right: 2rem; background: #10b981; color: white; padding: 1rem 2rem;
    border-radius: 10px; box-shadow: 0 10px 30px rgba(0,0,0,0.2); transform: translateX(calc(100% + 2rem)); transition: transform .5s;
}
.toast.show { transform: translateX(0); }
.toast.error { background: #ef4444; }
/* Error Popup Modal Styles */
.error-popup-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 3000;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
}
.error-popup-modal.active {
    display: flex;
}
.error-popup-content {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    max-width: 500px;
    width: 90%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    position: relative;
    animation: popupSlideIn 0.3s ease-out;
}
@keyframes popupSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}
.error-popup-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: #999;
    line-height: 1;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.2s;
}
.error-popup-close:hover {
    background: #f3f4f6;
    color: #333;
}
.error-popup-content h3 {
    margin: 0 0 1rem 0;
    color: #111827;
    font-size: 1.5rem;
    font-weight: 600;
}
.error-popup-content p {
    margin: 0 0 1.5rem 0;
    color: #4b5563;
    line-height: 1.6;
    font-size: 1rem;
}
.error-popup-content .btn {
    width: 100%;
    margin-top: 1rem;
}
@media (max-width: 768px) {
    .error-popup-content {
        padding: 1.5rem;
        margin: 1rem;
    }
    .error-popup-content h3 {
        font-size: 1.25rem;
    }
    .error-popup-content p {
        font-size: 0.95rem;
    }
}
.container {
    background: rgba(255, 255, 255, 0.95);
    margin: 2rem auto;
    border-radius: 18px;
    padding: 2rem;
    box-shadow: 0 20px 50px rgba(0,0,0,0.15);
    max-width: 1200px;
}
.grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 2rem;
}
.cover {
    border-radius: 14px;
    overflow: hidden;
    background: #fff;
    padding: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
}
.cover img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: contain;
}
h1 {
    color: var(--secondary);
    margin: 0 0 0.5rem;
}
.subtitle { color: #475569; margin-bottom: 1rem; }
.badge {
    display: inline-block;
    background: var(--accent);
    color: white;
    padding: 0.35rem 0.75rem;
    border-radius: 999px;
    font-size: 0.85rem;
    margin-bottom: 1rem;
}
.price-container {
    margin: 0.75rem 0 1rem;
}
.price-wrapper {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 0.5rem;
}
.price {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}
.old-price {
    text-decoration: line-through;
    color: #94a3b8;
    font-weight: 500;
    font-size: 1.5rem;
}
.new-price {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--primary);
}
.discount-badge {
    display: inline-block;
    background: linear-gradient(135deg, #f59e0b, #ef4444);
    color: white;
    padding: 0.4rem 0.9rem;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 700;
    box-shadow: 0 2px 8px rgba(245, 158, 11, 0.3);
    white-space: nowrap;
}
.offer-badge {
    display: inline-block;
    background: linear-gradient(135deg, #f59e0b, #ef4444);
    color: white;
    padding: 0.4rem 0.9rem;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 700;
    animation: pulse-badge 2s ease-in-out infinite;
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.4);
}
@keyframes pulse-badge {
    0%, 100% {
        transform: scale(1);
        box-shadow: 0 4px 12px rgba(245, 158, 11, 0.4);
    }
    50% {
        transform: scale(1.05);
        box-shadow: 0 6px 16px rgba(245, 158, 11, 0.6);
    }
}
.btns { display: flex; gap: .75rem; flex-wrap: wrap; margin: 1.25rem 0 2rem; }
.btn {
    border: none;
    padding: 0.9rem 1.4rem;
    border-radius: 999px;
    font-weight: 700;
    cursor: pointer;
}
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--primary-dark)); color: white; }
.btn-secondary { background: white; color: var(--primary); border: 2px solid var(--primary); text-decoration: none; display: inline-flex; align-items: center; }
.section { margin: 1.25rem 0 0; }
.section h2 { margin: 0 0 .5rem; color: var(--secondary); }
.features { list-style: none; padding: 0; margin: .5rem 0 0; }
.features li { margin: .35rem 0; }
footer .footer-bottom {
    text-align: center;
    border-top: 1px solid #e5e7eb;
    padding: 1.25rem 0 1.5rem;
}
@media (max-width: 1024px) {
    .container {
        padding: 1.5rem;
    }
}

@media (max-width: 768px) {
    body {
        font-size: 16px;
    }
    
    nav {
        padding: 0.75rem 1rem;
    }
    
    .logo {
        font-size: 1.5rem;
    }
    
    .container {
        padding: 1rem;
        margin: 1rem auto;
    }
    
    .grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .cover {
        padding: 8px;
    }
    
    h1 {
        font-size: 1.75rem;
    }
    
    .subtitle {
        font-size: 0.95rem;
    }
    
    .price-container {
        margin: 0.75rem 0 1rem;
    }
    .old-price {
        font-size: 1.25rem;
    }
    .new-price {
        font-size: 1.5rem;
    }
    .discount-badge {
        font-size: 0.75rem;
        padding: 0.3rem 0.65rem;
    }
    .offer-badge {
        font-size: 0.8rem;
        padding: 0.35rem 0.75rem;
    }
    
    .btns {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .btn {
        width: 100%;
        min-height: 44px;
        padding: 0.875rem 1.5rem;
    }
    
    .section {
        margin: 1rem 0 0;
    }
    
    .section h2 {
        font-size: 1.25rem;
    }
    
    .features li {
        font-size: 0.95rem;
    }
    
    .hamburger-menu {
        display: block;
        min-width: 44px;
        min-height: 44px;
        padding: 0.5rem;
    }
    
    .hamburger-menu.active .bar:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger-menu.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    
    .hamburger-menu.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 0;
        flex-direction: column;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        width: 100%;
        height: 100vh;
        padding-top: 5rem;
        text-align: center;
        transition: 0.3s;
        gap: 1.5rem;
        z-index: 100;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    /* Close button overlay when menu is open */
    .nav-menu.active::before {
        content: '';
        position: fixed;
        top: 1rem;
        right: 1rem;
        width: 44px;
        height: 44px;
        background: rgba(0, 0, 0, 0.05);
        border-radius: 50%;
        z-index: 102;
        pointer-events: none;
    }
    
    .nav-menu a {
        font-size: 1.25rem;
        padding: 0.75rem;
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .cart-icon {
        min-width: 44px;
        min-height: 44px;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .footer-section {
        text-align: center;
    }
    
    .modal-content {
        max-width: 95%;
        padding: 1.5rem;
        margin: 1rem;
    }
    
    .toast {
        bottom: 1rem;
        right: 1rem;
        left: 1rem;
        transform: translateX(calc(100% + 1rem));
        padding: 1rem;
        font-size: 0.9rem;
        max-width: calc(100% - 2rem);
    }
    
    .toast.show {
        transform: translateX(0);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0.75rem;
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    .old-price {
        font-size: 1.1rem;
    }
    .new-price {
        font-size: 1.35rem;
    }
    .discount-badge {
        font-size: 0.7rem;
        padding: 0.25rem 0.6rem;
    }
    .offer-badge {
        font-size: 0.75rem;
        padding: 0.3rem 0.65rem;
    }
    
    .logo, a.logo {
        font-size: 1.75rem;
    }
}