:root {
    color-scheme: light;
}

:root[data-theme="dark"] {
    color-scheme: dark;
    --primary-color: #60a5fa;
    --secondary-color: #3b82f6;
    --accent-color: #34d399;
    --light-bg: #0b1220;
    --dark-bg: #060b14;
    --text-dark: #e2e8f0;
    --text-light: #94a3b8;
    --border-color: #1f2937;
    --white: #0f172a;
    --bottle-blue: #3b82f6;
    --bottle-black: #111827;
    --bottle-white: #1f2937;
}

:root[data-theme="dark"] body {
    background-color: var(--light-bg);
    color: var(--text-dark);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.theme-toggle {
    border: 1px solid var(--border-color);
    background: var(--light-bg);
    color: var(--text-dark);
    padding: 0.45rem 0.9rem;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

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

.nav-logout {
    display: inline;
}

.nav-link-button {
    background: none;
    border: none;
    color: var(--text-dark);
    font-weight: 500;
    cursor: pointer;
    padding: 0;
    font: inherit;
}

.nav-link-button:hover {
    color: var(--primary-color);
}

.auth-page {
    min-height: calc(100vh - 240px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.auth-card {
    width: 100%;
    max-width: 520px;
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 20px 40px rgba(15, 23, 42, 0.12);
}

.auth-card h3 {
    margin-bottom: 1.5rem;
    color: var(--text-dark);
    font-size: 1.4rem;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 1.1rem;
}

.auth-form .form-group {
    gap: 0.4rem;
}

.auth-form input {
    background: #f8fafc;
    border-radius: 10px;
}

.auth-form input:focus {
    background: #ffffff;
}

.password-field {
    position: relative;
    display: flex;
    align-items: center;
}

.password-field input {
    width: 100%;
    padding-right: 3rem;
}

.toggle-password {
    position: absolute;
    right: 0.75rem;
    border: none;
    background: transparent;
    color: var(--text-light);
    font-weight: 600;
    cursor: pointer;
    padding: 0.25rem 0.4rem;
}

.toggle-password:hover {
    color: var(--primary-color);
}

:root[data-theme="dark"] .auth-form input {
    background: #0b1526;
    color: var(--text-dark);
    border-color: var(--border-color);
}

:root[data-theme="dark"] .auth-form input::placeholder {
    color: #94a3b8;
}

:root[data-theme="dark"] .cart-item {
    background-color: #0b1220;
    border-color: var(--border-color);
}

:root[data-theme="dark"] .cart-item__input {
    background-color: #0b1526;
    color: var(--text-dark);
    border-color: var(--border-color);
}

:root[data-theme="dark"] .cart-empty {
    background-color: #0b1526;
    border-color: var(--border-color);
}

:root[data-theme="dark"] .cart-name-input {
    background-color: #0b1526;
    color: var(--text-dark);
    border-color: var(--border-color);
}

:root[data-theme="dark"] .quantity-control {
    background: #0b1526;
    border-color: #1f2937;
}

:root[data-theme="dark"] .qty-btn {
    background: #111827;
    color: #e2e8f0;
}

:root[data-theme="dark"] .qty-btn:hover {
    background: #1f2937;
}

:root[data-theme="dark"] .quantity-input {
    background: #f8fafc;
    color: #0f172a;
}

:root[data-theme="dark"] .product-card__title {
    color: #0f172a;
}

:root[data-theme="dark"] .feature-popup__body h3 {
    color: #0f172a;
}

:root[data-theme="dark"] .cart-button {
    background: #1e293b;
    color: #f8fafc;
    border: 1px solid #1f2937;
}

:root[data-theme="dark"] .cart-count {
    background: #e2e8f0;
    color: #0f172a;
}

.auth-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

.auth-links {
    font-size: 0.9rem;
    color: var(--text-light);
}

.auth-links a {
    color: var(--primary-color);
    font-weight: 600;
    text-decoration: none;
}

.auth-links a:hover {
    text-decoration: underline;
}

@media (max-width: 480px) {
    .auth-card {
        padding: 1.5rem;
    }
}

.hero-spotlight {
    position: relative;
    overflow: hidden;
    background: radial-gradient(circle at top left, rgba(59, 130, 246, 0.35), transparent 45%),
        radial-gradient(circle at 80% 20%, rgba(20, 184, 166, 0.35), transparent 50%),
        #0f172a;
    color: #f8fafc;
    padding: 5rem 2rem;
}

.hero-spotlight::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(15, 23, 42, 0.9), rgba(15, 23, 42, 0.4));
    pointer-events: none;
}

.hero-grid {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 3rem;
    align-items: center;
}

.hero-copy h1 {
    font-size: clamp(2.5rem, 4vw, 3.6rem);
    line-height: 1.05;
    margin: 1rem 0;
}

.hero-copy p {
    font-size: 1.1rem;
    color: #cbd5f5;
    max-width: 520px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 1rem;
    border-radius: 999px;
    background: rgba(59, 130, 246, 0.2);
    color: #bfdbfe;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    font-size: 0.75rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    margin: 2rem 0 1.5rem;
    flex-wrap: wrap;
}

.hero-primary {
    box-shadow: 0 15px 25px rgba(59, 130, 246, 0.35);
}

.hero-secondary {
    padding: 0.9rem 1.6rem;
    border-radius: 999px;
    border: 2px solid rgba(255, 255, 255, 0.6);
    color: #f8fafc;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
}

.hero-secondary:hover {
    background: #f8fafc;
    color: #0f172a;
}

.hero-stats {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
    margin-top: 1.5rem;
}

.hero-stats strong {
    display: block;
    font-size: 1.2rem;
    color: #f8fafc;
}

.hero-stats span {
    font-size: 0.85rem;
    color: #94a3b8;
}

.hero-visual {
    display: flex;
    justify-content: center;
}

.hero-image-wrap {
    width: min(520px, 90vw);
    aspect-ratio: 4 / 5;
    border-radius: 28px;
    background: linear-gradient(160deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.02));
    box-shadow: 0 30px 60px rgba(15, 23, 42, 0.45);
    padding: 1.5rem;
    backdrop-filter: blur(6px);
}

.hero-image-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 22px;
}

@media (max-width: 768px) {
    .hero-spotlight {
        padding: 4rem 1.5rem;
        text-align: center;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-stats {
        justify-content: center;
    }
}

.page-header {
    position: relative;
    padding: 5rem 2rem;
    text-align: center;
    color: #f8fafc;
    background-image:
        linear-gradient(120deg, rgba(15, 23, 42, 0.9), rgba(15, 23, 42, 0.35)),
        url("/image/red wine.jpg");
    background-size: cover;
    background-position: center;
    overflow: hidden;
}

.page-header::after {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 20% 20%, rgba(59, 130, 246, 0.25), transparent 55%),
        radial-gradient(circle at 80% 30%, rgba(20, 184, 166, 0.2), transparent 50%);
    pointer-events: none;
}

.page-header h1,
.page-header p {
    position: relative;
    z-index: 1;
}

.page-header h1 {
    font-size: clamp(2.4rem, 4vw, 3.5rem);
    margin-bottom: 0.75rem;
}

.page-header p {
    max-width: 640px;
    margin: 0 auto;
    color: #e2e8f0;
    font-size: 1.05rem;
}

.page-header.product-header {
    background-image:
        linear-gradient(120deg, rgba(15, 23, 42, 0.9), rgba(15, 23, 42, 0.4)),
        url("/image/custom water bottle.png");
}

@media (max-width: 768px) {
    .page-header {
        padding: 4rem 1.5rem;
    }
}

:root[data-theme="dark"] .navbar {
    background-color: var(--white);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.35);
}

:root[data-theme="dark"] .nav-menu a {
    color: var(--text-dark);
}

:root[data-theme="dark"] .nav-menu a.active::after {
    background-color: var(--primary-color);
}

:root[data-theme="dark"] .hamburger span {
    background-color: var(--text-dark);
}

:root[data-theme="dark"] .nav-menu.active {
    background-color: var(--white);
}

:root[data-theme="dark"] .features,
:root[data-theme="dark"] .feature-card,
:root[data-theme="dark"] .product-item,
:root[data-theme="dark"] .filters,
:root[data-theme="dark"] .product-card,
:root[data-theme="dark"] .product-hero,
:root[data-theme="dark"] .product-thumb,
:root[data-theme="dark"] .size-pill,
:root[data-theme="dark"] .quantity-control,
:root[data-theme="dark"] .review-card,
:root[data-theme="dark"] .related-card,
:root[data-theme="dark"] .care-card,
:root[data-theme="dark"] .instructions-panel,
:root[data-theme="dark"] .customizer-panel,
:root[data-theme="dark"] .faq-item,
:root[data-theme="dark"] .faq-question,
:root[data-theme="dark"] .modal-content,
:root[data-theme="dark"] .admin-panel,
:root[data-theme="dark"] .stat-card,
:root[data-theme="dark"] .message-full {
    background-color: var(--white);
}

:root[data-theme="dark"] .feature-card,
:root[data-theme="dark"] .stat-card {
    background-image: none;
}

:root[data-theme="dark"] .faq-question:hover {
    background-color: #111c2f;
}

:root[data-theme="dark"] .product-hero img,
:root[data-theme="dark"] .product-thumb img {
    background: #0b1220;
}

:root[data-theme="dark"] .products-table thead {
    background-color: #0f172a;
}

:root[data-theme="dark"] .products-table tbody tr:hover {
    background-color: #0b1526;
}

:root[data-theme="dark"] .footer {
    background-color: var(--dark-bg);
}

@media (max-width: 768px) {
    .nav-actions {
        gap: 0.75rem;
    }

    .theme-toggle {
        padding: 0.35rem 0.8rem;
        font-size: 0.8rem;
    }
}