:root {
    --color-bg: #000000;
    --color-text: #ffffff;
    --color-text-muted: #a0a0a0;
    --color-accent: #ffffff;
    --color-border: #333333;
    --color-surface: #111111;

    --font-primary: 'Inter', sans-serif;
    --font-heading: 'Inter', sans-serif;
    /* Keeping it clean with Inter for headings too, or could use Playfair */

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

    --container-width: 1200px;
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

/* Reset & Base */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 {
    font-size: 3.5rem;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2.5rem;
    letter-spacing: -0.01em;
}

h3 {
    font-size: 1.5rem;
}

p {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-muted);
}

/* Utilities */
.container {
    width: 90%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

.text-center {
    text-align: center;
}

.section {
    padding: var(--spacing-xl) 0;
}

.btn {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
    font-size: 0.9rem;
}

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

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

.btn--secondary {
    background-color: transparent;
    border-color: var(--color-border);
    color: var(--color-text);
}

.btn--secondary:hover {
    border-color: var(--color-accent);
}

.btn--large {
    padding: 1.2rem 3rem;
    font-size: 1.1rem;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 0;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    color: var(--color-accent);
}

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

.nav__link {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    opacity: 0.8;
    transition: var(--transition);
}

.nav__link:hover {
    opacity: 1;
    color: var(--color-accent);
}

.header__btn {
    padding: 0.6rem 1.5rem;
    font-size: 0.8rem;
}

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    position: relative;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    background-color: var(--color-text);
    left: 0;
    transition: var(--transition);
}

.hamburger::before {
    top: -8px;
}

.hamburger::after {
    top: 8px;
}

/* Hero */
.hero {
    padding-top: 160px;
    /* Header height + spacing */
    padding-bottom: var(--spacing-xl);
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero__container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: var(--spacing-lg);
}

.hero__content {
    z-index: 2;
}

.hero__title {
    font-size: 4.5rem;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(to right, #fff, #888);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero__subtitle {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
    max-width: 500px;
}

.hero__actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.hero__trust {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.hero__image-wrapper {
    position: relative;
    display: flex;
    justify-content: center;
}

.hero__image {
    max-height: 600px;
    filter: drop-shadow(0 0 50px rgba(255, 255, 255, 0.1));
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-20px);
    }

    100% {
        transform: translateY(0);
    }
}

/* Benefits */
.benefits__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.benefit-card {
    background-color: var(--color-surface);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.benefit-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-accent);
}

.benefit-card__icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.benefit-card__title {
    margin-bottom: var(--spacing-xs);
}

/* Feature Showcase */
.feature-showcase__container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: var(--spacing-lg);
}

.feature-showcase__content {
    order: 2;
}

.feature-showcase__image {
    order: 1;
}

.feature-list {
    margin-top: var(--spacing-md);
}

.feature-list li {
    margin-bottom: var(--spacing-sm);
    padding-left: 1.5rem;
    position: relative;
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-accent);
}

/* Lifestyle */
.lifestyle__container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: var(--spacing-lg);
}

.lifestyle__image img {
    border-radius: var(--border-radius);
    filter: grayscale(100%);
    transition: var(--transition);
}

.lifestyle__image img:hover {
    filter: grayscale(0%);
}

/* Ingredients */
.ingredients {
    background-color: var(--color-surface);
}

.ingredients__wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: var(--spacing-lg);
}

.ingredients-table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-md) 0;
}

.ingredients-table th,
.ingredients-table td {
    text-align: left;
    padding: 1rem;
    border-bottom: 1px solid var(--color-border);
}

.ingredients-table th {
    color: var(--color-text-muted);
    font-weight: 400;
    text-transform: uppercase;
    font-size: 0.8rem;
}

.ingredients__note {
    font-size: 0.8rem;
    font-style: italic;
}

/* Reviews */
.reviews__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.review-card {
    background-color: rgba(255, 255, 255, 0.05);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
}

.review-card__stars {
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

.review-card__text {
    font-style: italic;
    font-size: 1.1rem;
    color: var(--color-text);
}

.review-card__author {
    margin-top: var(--spacing-sm);
    font-weight: 600;
    color: var(--color-text-muted);
}

/* CTA */
.cta__container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: var(--spacing-lg);
    background: radial-gradient(circle at center, #222 0%, #000 70%);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
}

.cta__price {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 0;
    color: var(--color-accent);
}

.cta__price span {
    font-size: 1rem;
    color: var(--color-text-muted);
    font-weight: 400;
}

.cta__subtext {
    margin-bottom: var(--spacing-md);
}

.cta__guarantee {
    margin-top: var(--spacing-sm);
    font-size: 0.8rem;
    opacity: 0.7;
}

/* FAQ */
.faq__list {
    max-width: 800px;
    margin: var(--spacing-lg) auto 0;
}

.faq__item {
    border-bottom: 1px solid var(--color-border);
    padding: 1.5rem 0;
}

.faq__question {
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq__question::after {
    content: '+';
    font-size: 1.5rem;
    font-weight: 300;
}

details[open] .faq__question::after {
    content: '-';
}

.faq__answer {
    margin-top: var(--spacing-sm);
    color: var(--color-text-muted);
    padding-right: 2rem;
}

/* Footer */
.footer {
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-lg) 0 var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.footer__container {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.footer__links ul li {
    margin-bottom: 0.5rem;
}

.footer__links a:hover {
    color: var(--color-accent);
}

.footer__social {
    display: flex;
    gap: 1rem;
}

/* Hamburger Animation */
.mobile-toggle.active .hamburger {
    background-color: transparent;
}

.mobile-toggle.active .hamburger::before {
    transform: rotate(45deg);
    top: 0;
}

.mobile-toggle.active .hamburger::after {
    transform: rotate(-45deg);
    top: 0;
}

/* Footer Social */
.footer__social a {
    border: 1px solid var(--color-border);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--transition);
    color: var(--color-text-muted);
}

.footer__social a:hover {
    background-color: var(--color-accent);
    color: var(--color-bg);
    border-color: var(--color-accent);
}

.footer__social a svg {
    transition: transform 0.3s ease;
}

.footer__social a:hover svg {
    transform: scale(1.1);
}

.footer__bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid #111;
    color: #555;
    font-size: 0.8rem;
}

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

    .hero__container,
    .feature-showcase__container,
    .lifestyle__container,
    .ingredients__wrapper,
    .cta__container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-md);
    }

    .hero {
        padding-top: 120px;
    }

    .hero__actions {
        justify-content: center;
    }

    .feature-showcase__content {
        order: 1;
    }

    .feature-showcase__image {
        order: 2;
    }

    .feature-list li {
        display: inline-block;
        margin-right: 1rem;
        text-align: left;
    }

    .ingredients-table th,
    .ingredients-table td {
        text-align: center;
    }
}

@media (max-width: 768px) {
    .nav {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background-color: #000;
        padding: 2rem;
        transform: translateY(-150%);
        transition: transform 0.3s ease-in-out;
        border-bottom: 1px solid var(--color-border);
    }

    .nav.active {
        transform: translateY(0);
    }

    .nav__list {
        flex-direction: column;
        align-items: center;
        gap: 1.5rem;
    }

    .mobile-toggle {
        display: block;
    }

    .header__btn {
        display: none;
    }

    h1 {
        font-size: 2.5rem;
    }
}