/* === CSS Stylesheet for Drevalionae === */

/* === IMPORT FONTS === */
@import url('https://fonts.googleapis.com/css2?family=Crimson+Text:ital,wght@0,400;0,600;0,700;1,400&family=Noto+Sans:wght@300;400;500;600;700&display=swap');

/* === CSS VARIABLES === */
:root {
    /* Colors */
    --color-background: #FAF9F6;
    --color-accent: #A1C3A1;
    --color-accent-light: rgba(161, 195, 161, 0.2);
    --color-accent-dark: #84a684;
    --color-secondary: #D9CAB3;
    --color-secondary-light: rgba(217, 202, 179, 0.3);
    --color-text: #2D2D2D;
    --color-text-light: #4D4D4D;
    --color-white: #FFFFFF;
    
    /* Typography */
    --font-primary: 'Crimson Text', serif;
    --font-secondary: 'Noto Sans', sans-serif;
    --font-size-base: 1rem;
    --font-size-sm: 0.875rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --font-size-3xl: 2.5rem;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Borders */
    --border-radius-sm: 0.25rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 1rem;
    --border-radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Breakpoints */
    --breakpoint-sm: 576px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 992px;
    --breakpoint-xl: 1200px;

    /* Container Widths */
    --container-max-width: 1200px;
    --container-padding: 1.5rem;
}

/* === GLOBAL STYLES === */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 100%;
    scroll-behavior: smooth;
}

body {
    background-color: var(--color-background);
    color: var(--color-text);
    font-family: var(--font-secondary);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    overflow-x: hidden;
}

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

a {
    color: var(--color-accent-dark);
    text-decoration: none;
    transition: color var(--transition-normal);
}

a:hover, a:focus {
    color: var(--color-accent);
}

ul, ol {
    list-style: none;
}

.container {
    margin: 0 auto;
    max-width: var(--container-max-width);
    padding: 0 var(--container-padding);
    width: 100%;
}

.section-title {
    color: var(--color-text);
    font-family: var(--font-primary);
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

.section-subtitle {
    color: var(--color-text-light);
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.button {
    align-items: center;
    background-color: var(--color-accent);
    border: none;
    border-radius: var(--border-radius-full);
    color: var(--color-white);
    cursor: pointer;
    display: inline-flex;
    font-size: var(--font-size-base);
    font-weight: 600;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    transition: background-color var(--transition-normal), transform var(--transition-normal);
}

.button:hover, .button:focus {
    background-color: var(--color-accent-dark);
    color: var(--color-white);
    transform: translateY(-2px);
}

.wave-separator {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 100' preserveAspectRatio='none'%3E%3Cpath fill='%23FAF9F6' d='M0,32L60,53.3C120,75,240,117,360,122.7C480,128,600,96,720,85.3C840,75,960,85,1080,80C1200,75,1320,53,1380,42.7L1440,32L1440,320L1380,320C1320,320,1200,320,1080,320C960,320,840,320,720,320C600,320,480,320,360,320C240,320,120,320,60,320L0,320Z'%3E%3C/path%3E%3C/svg%3E");
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    height: 60px;
    margin-top: var(--spacing-xl);
    position: relative;
    width: 100%;
}

.wave-separator--reversed {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 100' preserveAspectRatio='none'%3E%3Cpath fill='%23FAF9F6' d='M0,64L60,53.3C120,43,240,21,360,32C480,43,600,85,720,96C840,107,960,85,1080,64C1200,43,1320,21,1380,10.7L1440,0L1440,320L1380,320C1320,320,1200,320,1080,320C960,320,840,320,720,320C600,320,480,320,360,320C240,320,120,320,60,320L0,320Z'%3E%3C/path%3E%3C/svg%3E");
}

.visually-hidden {
    border: 0;
    clip: rect(0 0 0 0);
    height: 1px;
    margin: -1px;
    overflow: hidden;
    padding: 0;
    position: absolute;
    width: 1px;
}

/* Skip Link */
.skip-link {
    background-color: var(--color-accent);
    color: var(--color-white);
    font-weight: 600;
    left: 50%;
    padding: var(--spacing-sm);
    position: absolute;
    top: -100px;
    transform: translateX(-50%);
    transition: top var(--transition-normal);
    z-index: 1000;
}

.skip-link:focus {
    top: 0;
}

/* === HEADER === */
.header {
    background-color: var(--color-background);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    width: 100%;
    z-index: 100;
}

.header__container {
    align-items: center;
    display: flex;
    justify-content: space-between;
    margin: 0 auto;
    max-width: var(--container-max-width);
    padding: 0 var(--container-padding);
}

.header__logo {
    height: auto;
    max-height: 40px;
    width: auto;
}

.header__nav-toggle {
    background: none;
    border: none;
    cursor: pointer;
    display: block;
    height: 30px;
    position: relative;
    width: 30px;
    z-index: 100;
}

.header__nav-toggle-icon,
.header__nav-toggle-icon::before,
.header__nav-toggle-icon::after {
    background-color: var(--color-text);
    display: block;
    height: 2px;
    position: absolute;
    transition: all var(--transition-normal);
    width: 100%;
}

.header__nav-toggle-icon {
    top: 50%;
    transform: translateY(-50%);
}

.header__nav-toggle-icon::before,
.header__nav-toggle-icon::after {
    content: '';
    left: 0;
}

.header__nav-toggle-icon::before {
    top: -8px;
}

.header__nav-toggle-icon::after {
    bottom: -8px;
}

.header__nav-toggle[aria-expanded="true"] .header__nav-toggle-icon {
    background-color: transparent;
}

.header__nav-toggle[aria-expanded="true"] .header__nav-toggle-icon::before {
    top: 0;
    transform: rotate(45deg);
}

.header__nav-toggle[aria-expanded="true"] .header__nav-toggle-icon::after {
    bottom: 0;
    transform: rotate(-45deg);
}

.header__nav-list {
    background-color: var(--color-background);
    display: flex;
    flex-direction: column;
    left: 0;
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    padding: 0;
    position: absolute;
    top: 100%;
    transition: all var(--transition-normal);
    visibility: hidden;
    width: 100%;
    z-index: 90;
}

.header__nav-toggle[aria-expanded="true"] + .header__nav-list {
    max-height: 300px;
    opacity: 1;
    padding: var(--spacing-md);
    visibility: visible;
}

.header__nav-item {
    margin: var(--spacing-xs) 0;
}

.header__nav-link {
    color: var(--color-text);
    display: block;
    font-size: var(--font-size-base);
    font-weight: 500;
    padding: var(--spacing-xs) 0;
    position: relative;
    transition: color var(--transition-normal);
}

.header__nav-link:hover,
.header__nav-link:focus {
    color: var(--color-accent);
}

.header__nav-link::after {
    background-color: var(--color-accent);
    bottom: 0;
    content: '';
    height: 2px;
    left: 0;
    position: absolute;
    transform: scaleX(0);
    transition: transform var(--transition-normal);
    width: 100%;
}

.header__nav-link:hover::after,
.header__nav-link:focus::after {
    transform: scaleX(1);
}

/* === HERO SECTION === */
.hero {
    background-color: var(--color-accent-light);
    overflow: hidden;
    padding: var(--spacing-xl) 0 0;
    position: relative;
}

.hero__container {
    align-items: center;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    margin: 0 auto;
    max-width: var(--container-max-width);
    padding: 0 var(--container-padding);
}

.hero__content {
    margin-bottom: var(--spacing-xl);
    max-width: 100%;
    text-align: center;
    width: 100%;
}

.hero__title {
    color: var(--color-text);
    font-family: var(--font-primary);
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.hero__subtitle {
    color: var(--color-text-light);
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-lg);
}

.hero__image-container {
    border-radius: var(--border-radius-lg);
    margin-bottom: var(--spacing-lg);
    max-width: 100%;
    overflow: hidden;
    width: 100%;
}

.hero__image {
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    height: auto;
    width: 100%;
}

/* === HERBS EFFECTS SECTION === */
.herbs-effects {
    background-color: var(--color-white);
    padding: var(--spacing-xl) 0 0;
    position: relative;
}

.herbs-effects__grid {
    display: grid;
    gap: var(--spacing-lg);
    grid-template-columns: 1fr;
    margin-bottom: var(--spacing-xl);
}

.herbs-effects__item {
    background-color: var(--color-background);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-lg);
    text-align: center;
    transition: transform var(--transition-normal);
}

.herbs-effects__item:hover {
    transform: translateY(-5px);
}

.herbs-effects__icon {
    display: inline-flex;
    height: 60px;
    margin-bottom: var(--spacing-md);
    width: 60px;
}

.herbs-effects__title {
    color: var(--color-text);
    font-family: var(--font-primary);
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
}

.herbs-effects__description {
    color: var(--color-text-light);
}

/* === SLEEP STORIES SECTION === */
.sleep-stories {
    background-color: var(--color-accent-light);
    padding: var(--spacing-xl) 0 0;
    position: relative;
}

.sleep-stories__grid {
    display: grid;
    gap: var(--spacing-lg);
    grid-template-columns: 1fr;
    margin-bottom: var(--spacing-xl);
}

.sleep-stories__item {
    background-color: var(--color-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sleep-stories__image {
    height: 200px;
    object-fit: cover;
    width: 100%;
}

.sleep-stories__content {
    padding: var(--spacing-lg);
}

.sleep-stories__name {
    color: var(--color-text);
    font-family: var(--font-primary);
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-sm);
}

.sleep-stories__text {
    color: var(--color-text-light);
    font-style: italic;
}

/* === HOW IT WORKS SECTION === */
.how-it-works {
    background-color: var(--color-white);
    padding: var(--spacing-xl) 0 0;
    position: relative;
}

.how-it-works__steps {
    display: grid;
    gap: var(--spacing-lg);
    grid-template-columns: 1fr;
    margin-bottom: var(--spacing-xl);
}

.how-it-works__step {
    align-items: center;
    display: flex;
    flex-direction: column;
    text-align: center;
}

.how-it-works__step-number {
    align-items: center;
    background-color: var(--color-accent);
    border-radius: var(--border-radius-full);
    color: var(--color-white);
    display: flex;
    font-family: var(--font-primary);
    font-size: var(--font-size-xl);
    font-weight: 700;
    height: 60px;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    width: 60px;
}

.how-it-works__step-title {
    color: var(--color-text);
    font-family: var(--font-primary);
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-sm);
}

.how-it-works__step-description {
    color: var(--color-text-light);
}

/* === SCIENTIFIC SUPPORT SECTION === */
.scientific-support {
    background-color: var(--color-accent-light);
    padding: var(--spacing-xl) 0 0;
    position: relative;
}

.scientific-support__content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.scientific-support__image-container {
    border-radius: var(--border-radius-lg);
    max-width: 100%;
    overflow: hidden;
}

.scientific-support__image {
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    height: auto;
    width: 100%;
}

.scientific-support__text {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.scientific-support__title {
    color: var(--color-text);
    font-family: var(--font-primary);
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
}

.scientific-support__description {
    color: var(--color-text-light);
}

/* === PRODUCT GALLERY SECTION === */
.product-gallery {
    background-color: var(--color-white);
    padding: var(--spacing-xl) 0 0;
    position: relative;
}

.product-gallery__grid {
    display: grid;
    gap: var(--spacing-lg);
    grid-template-columns: 1fr;
    margin-bottom: var(--spacing-xl);
}

.product-gallery__item {
    background-color: var(--color-background);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: transform var(--transition-normal);
}

.product-gallery__item:hover {
    transform: translateY(-5px);
}

.product-gallery__image-container {
    max-width: 100%;
    overflow: hidden;
}

.product-gallery__image {
    height: 250px;
    object-fit: cover;
    transition: transform var(--transition-normal);
    width: 100%;
}

.product-gallery__item:hover .product-gallery__image {
    transform: scale(1.05);
}

.product-gallery__content {
    padding: var(--spacing-lg);
}

.product-gallery__title {
    color: var(--color-text);
    font-family: var(--font-primary);
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
}

.product-gallery__description {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.product-gallery__price {
    color: var(--color-text);
    font-family: var(--font-primary);
    font-size: var(--font-size-xl);
    font-weight: 700;
}

/* === SLEEP STATS SECTION === */
.sleep-stats {
    background-color: var(--color-accent-light);
    padding: var(--spacing-xl) 0 0;
    position: relative;
}

.sleep-stats__grid {
    display: grid;
    gap: var(--spacing-lg);
    grid-template-columns: 1fr;
    margin-bottom: var(--spacing-xl);
}

.sleep-stats__item {
    background-color: var(--color-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-lg);
    text-align: center;
}

.sleep-stats__number {
    color: var(--color-accent);
    font-family: var(--font-primary);
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.sleep-stats__description {
    color: var(--color-text-light);
}

/* === FAQ SECTION === */
.faq {
    background-color: var(--color-white);
    padding: var(--spacing-xl) 0 0;
    position: relative;
}

.faq__list {
    margin-bottom: var(--spacing-xl);
}

.faq__item {
    border-bottom: 1px solid var(--color-secondary-light);
    margin-bottom: var(--spacing-md);
}

.faq__question {
    align-items: center;
    background: none;
    border: none;
    color: var(--color-text);
    cursor: pointer;
    display: flex;
    font-family: var(--font-primary);
    font-size: var(--font-size-lg);
    font-weight: 600;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
    text-align: left;
    width: 100%;
}

.faq__icon {
    height: 24px;
    position: relative;
    width: 24px;
}

.faq__icon::before,
.faq__icon::after {
    background-color: var(--color-accent);
    content: '';
    height: 2px;
    left: 0;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    transition: transform var(--transition-normal);
    width: 100%;
}

.faq__icon::after {
    transform: translateY(-50%) rotate(90deg);
}

.faq__question[aria-expanded="true"] .faq__icon::after {
    transform: translateY(-50%) rotate(0);
}

.faq__answer {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: all var(--transition-normal);
}

.faq__question[aria-expanded="true"] + .faq__answer {
    max-height: 1000px;
    opacity: 1;
    padding-bottom: var(--spacing-md);
}

.faq__answer p {
    color: var(--color-text-light);
}

/* === CONTACT SECTION === */
.contact {
    background-color: var(--color-accent-light);
    padding: var(--spacing-xl) 0 var(--spacing-3xl);
    position: relative;
}

.contact__content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.contact__info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.contact__info-item {
    align-items: flex-start;
    display: flex;
    gap: var(--spacing-md);
}

.contact__icon {
    flex-shrink: 0;
    margin-top: 4px;
}

.contact__info-title {
    color: var(--color-text);
    font-family: var(--font-primary);
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xs);
}

.contact__info-text {
    color: var(--color-text-light);
}

.contact__form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.contact__form-group {
    display: flex;
    flex-direction: column;
}

.contact__form-label {
    color: var(--color-text);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.contact__form-input,
.contact__form-textarea {
    background-color: var(--color-white);
    border: 1px solid var(--color-secondary);
    border-radius: var(--border-radius-md);
    color: var(--color-text);
    font-family: var(--font-secondary);
    font-size: var(--font-size-base);
    padding: var(--spacing-sm);
    transition: border-color var(--transition-normal);
}

.contact__form-textarea {
    min-height: 150px;
    resize: vertical;
}

.contact__form-input:focus,
.contact__form-textarea:focus {
    border-color: var(--color-accent);
    outline: none;
}

.contact__form-input:invalid:not(:placeholder-shown),
.contact__form-textarea:invalid:not(:placeholder-shown) {
    border-color: #e74c3c;
}

.contact__form-error {
    color: #e74c3c;
    font-size: var(--font-size-sm);
    height: 20px;
    margin-top: var(--spacing-xs);
}

.contact__form-submit {
    align-self: flex-start;
}

/* === SUCCESS MESSAGE SECTION === */
.success-message {
    background-color: var(--color-accent-light);
    min-height: 60vh;
    padding: var(--spacing-3xl) 0;
    position: relative;
}

.success-message__content {
    align-items: center;
    background-color: var(--color-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    margin: 0 auto;
    max-width: 600px;
    padding: var(--spacing-xl);
    text-align: center;
}

.success-message__icon {
    margin-bottom: var(--spacing-lg);
}

.success-message__title {
    color: var(--color-text);
    font-family: var(--font-primary);
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
}

.success-message__text {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
}

.success-message__actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    width: 100%;
}

.button--secondary {
    background-color: transparent;
    border: 2px solid var(--color-accent);
    color: var(--color-accent);
}

.button--secondary:hover,
.button--secondary:focus {
    background-color: var(--color-accent-light);
    color: var(--color-accent-dark);
}

@media (min-width: 576px) {
    .success-message__actions {
        flex-direction: row;
        justify-content: center;
    }
}

/* === PAGE CONTENT === */
.page-content {
    background-color: var(--color-accent-light);
    padding: var(--spacing-xl) 0 var(--spacing-3xl);
    position: relative;
}

.page-title {
    color: var(--color-text);
    font-family: var(--font-primary);
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.page-text {
    background-color: var(--color-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    margin: 0 auto;
    max-width: 800px;
    padding: var(--spacing-xl);
}

.page-text h2 {
    color: var(--color-text);
    font-family: var(--font-primary);
    font-size: var(--font-size-xl);
    margin: var(--spacing-lg) 0 var(--spacing-md);
}

.page-text h2:first-child {
    margin-top: 0;
}

.page-text h3 {
    color: var(--color-text);
    font-family: var(--font-primary);
    font-size: var(--font-size-lg);
    margin: var(--spacing-md) 0 var(--spacing-sm);
}

.page-text p {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.page-text ul {
    color: var(--color-text-light);
    list-style: disc;
    margin: 0 0 var(--spacing-md) var(--spacing-lg);
}

.page-text li {
    margin-bottom: var(--spacing-xs);
}

/* === FOOTER === */
.footer {
    background-color: var(--color-secondary-light);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    position: relative;
}

.footer__content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer__info {
    text-align: center;
}

.footer__logo {
    display: inline-block;
    height: auto;
    margin-bottom: var(--spacing-md);
    max-height: 40px;
    width: auto;
}

.footer__slogan {
    color: var(--color-text);
    font-family: var(--font-primary);
    font-size: var(--font-size-lg);
    font-style: italic;
    margin-bottom: var(--spacing-md);
}

.footer__address,
.footer__contact {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xs);
}

.footer__nav {
    display: grid;
    gap: var(--spacing-lg);
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.footer__nav-title {
    color: var(--color-text);
    font-family: var(--font-primary);
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
}

.footer__nav-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer__nav-link {
    color: var(--color-text-light);
    transition: color var(--transition-normal);
}

.footer__nav-link:hover,
.footer__nav-link:focus {
    color: var(--color-accent);
}

.footer__bottom {
    border-top: 1px solid rgba(45, 45, 45, 0.1);
    padding-top: var(--spacing-lg);
    text-align: center;
}

.footer__copyright {
    color: var(--color-text-light);
    font-size: var(--font-size-sm);
}

.footer__decoration {
    bottom: 0;
    left: 0;
    position: absolute;
    width: 100%;
    z-index: -1;
}

/* === BACK TO TOP BUTTON === */
.back-to-top {
    align-items: center;
    background-color: var(--color-accent);
    border: none;
    border-radius: var(--border-radius-full);
    bottom: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    color: var(--color-white);
    cursor: pointer;
    display: flex;
    height: 50px;
    justify-content: center;
    opacity: 0;
    position: fixed;
    right: var(--spacing-lg);
    transform: translateY(20px);
    transition: opacity var(--transition-normal), transform var(--transition-normal), background-color var(--transition-normal);
    visibility: hidden;
    width: 50px;
    z-index: 99;
}

.back-to-top.visible {
    opacity: 1;
    transform: translateY(0);
    visibility: visible;
}

.back-to-top:hover,
.back-to-top:focus {
    background-color: var(--color-accent-dark);
}

/* === RESPONSIVE STYLES === */
@media (min-width: 576px) {
    .section-title {
        font-size: var(--font-size-2xl);
    }

    .hero__title {
        font-size: var(--font-size-3xl);
    }
    
    .herbs-effects__grid,
    .sleep-stats__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 768px) {
    .section-title {
        font-size: calc(var(--font-size-2xl) * 1.2);
    }

    .hero__container {
        flex-direction: row;
    }
    
    .hero__content {
        margin-bottom: 0;
        max-width: 50%;
        text-align: left;
    }
    
    .hero__title {
        font-size: calc(var(--font-size-3xl) * 1.2);
    }
    
    .hero__image-container {
        margin-bottom: 0;
        max-width: 45%;
    }
    
    .herbs-effects__grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .sleep-stories__grid,
    .product-gallery__grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .sleep-stories__item {
        flex-direction: row;
    }
    
    .sleep-stories__image {
        height: auto;
        width: 40%;
    }
    
    .how-it-works__steps {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .scientific-support__content {
        flex-direction: row;
    }
    
    .scientific-support__image-container,
    .scientific-support__text {
        width: 48%;
    }
    
    .contact__content {
        flex-direction: row;
    }
    
    .contact__info,
    .contact__form {
        width: 48%;
    }
    
    .footer__content {
        flex-direction: row;
    }
    
    .footer__info {
        text-align: left;
        width: 30%;
    }
    
    .footer__nav {
        width: 70%;
    }
    
    .header__nav-toggle {
        display: none;
    }
    
    .header__nav-list {
        background-color: transparent;
        display: flex;
        flex-direction: row;
        gap: var(--spacing-lg);
        max-height: none;
        opacity: 1;
        position: static;
        visibility: visible;
    }
    
    .header__nav-item {
        margin: 0;
    }
}

@media (min-width: 992px) {
    .section-title {
        font-size: calc(var(--font-size-2xl) * 1.4);
    }
    
    .hero__title {
        font-size: calc(var(--font-size-3xl) * 1.4);
    }
    
    .sleep-stories__grid,
    .product-gallery__grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .sleep-stories__item {
        flex-direction: column;
    }
    
    .sleep-stories__image {
        height: 200px;
        width: 100%;
    }
    
    .how-it-works__steps {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .sleep-stats__grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* === DARK MODE === */
@media (prefers-color-scheme: dark) {
    :root {
        --color-background: #1A1A1A;
        --color-accent: #A1C3A1;
        --color-accent-light: rgba(161, 195, 161, 0.1);
        --color-secondary: #4D4D4D;
        --color-secondary-light: rgba(77, 77, 77, 0.3);
        --color-text: #E0E0E0;
        --color-text-light: #B0B0B0;
        --color-white: #2D2D2D;
    }
    
    .wave-separator {
        background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 100' preserveAspectRatio='none'%3E%3Cpath fill='%231A1A1A' d='M0,32L60,53.3C120,75,240,117,360,122.7C480,128,600,96,720,85.3C840,75,960,85,1080,80C1200,75,1320,53,1380,42.7L1440,32L1440,320L1380,320C1320,320,1200,320,1080,320C960,320,840,320,720,320C600,320,480,320,360,320C240,320,120,320,60,320L0,320Z'%3E%3C/path%3E%3C/svg%3E");
    }
    
    .wave-separator--reversed {
        background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 100' preserveAspectRatio='none'%3E%3Cpath fill='%231A1A1A' d='M0,64L60,53.3C120,43,240,21,360,32C480,43,600,85,720,96C840,107,960,85,1080,64C1200,43,1320,21,1380,10.7L1440,0L1440,320L1380,320C1320,320,1200,320,1080,320C960,320,840,320,720,320C600,320,480,320,360,320C240,320,120,320,60,320L0,320Z'%3E%3C/path%3E%3C/svg%3E");
    }
}

/* === REDUCED MOTION === */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}