/**
 * Dorvaline - Trekking Website Styles
 * Author: Dorvaline Team
 * Version: 1.0
 * 
 * Contents:
 * 1. Variables
 * 2. Base Styles
 * 3. Typography
 * 4. Layout & Grid
 * 5. Header
 * 6. Hero Section
 * 7. Intro Section
 * 8. Trails Section
 * 9. Benefits Section
 * 10. Stories Section
 * 11. Gear Section
 * 12. Wellness Section
 * 13. FAQ Section
 * 14. Contact Section
 * 15. Legal Pages
 * 16. Success Page
 * 17. Footer
 * 18. Buttons & Form Elements
 * 19. Back to Top Button
 * 20. Utilities
 * 21. Media Queries
 */

/* ================================
   1. Variables
   ================================ */
:root {
    /* Colors */
    --color-background: #3C2F2F;
    --color-accent: #6B4E31;
    --color-text: #F5E6CC;
    --color-button: #A68A64;
    --color-button-hover: #8a7352;
    --color-dark: #2A2121;
    --color-light: #FFFFFF;
    --color-shadow: rgba(0, 0, 0, 0.2);
    --color-overlay: rgba(60, 47, 47, 0.7);
    --color-overlay-light: rgba(60, 47, 47, 0.4);
    --color-error: #CF6679;
    --color-success: #4CAF50;

    /* Typography */
    --font-heading: 'Merriweather', serif;
    --font-body: 'Open Sans', sans-serif;
    --font-size-xs: 0.75rem;     /* 12px */
    --font-size-sm: 0.875rem;    /* 14px */
    --font-size-base: 1rem;      /* 16px */
    --font-size-md: 1.125rem;    /* 18px */
    --font-size-lg: 1.25rem;     /* 20px */
    --font-size-xl: 1.5rem;      /* 24px */
    --font-size-2xl: 1.875rem;   /* 30px */
    --font-size-3xl: 2.25rem;    /* 36px */
    --font-size-4xl: 3rem;       /* 48px */
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-black: 900;
    --line-height-tight: 1.2;
    --line-height-normal: 1.5;
    --line-height-loose: 1.8;

    /* Spacing */
    --spacing-xs: 0.25rem;       /* 4px */
    --spacing-sm: 0.5rem;        /* 8px */
    --spacing-md: 1rem;          /* 16px */
    --spacing-lg: 1.5rem;        /* 24px */
    --spacing-xl: 2rem;          /* 32px */
    --spacing-2xl: 3rem;         /* 48px */
    --spacing-3xl: 4rem;         /* 64px */
    --spacing-4xl: 6rem;         /* 96px */

    /* Borders */
    --border-radius-sm: 0.25rem;  /* 4px */
    --border-radius-md: 0.5rem;   /* 8px */
    --border-radius-lg: 1rem;     /* 16px */
    --border-radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;

    /* Z-index */
    --z-index-negative: 1;
    --z-index-base: 2;
    --z-index-dropdown: 10;
    --z-index-sticky: 20;
    --z-index-fixed: 30;
    --z-index-modal: 40;
    --z-index-popover: 50;
    --z-index-toast: 60;

    /* Containers */
    --container-max-width: 1200px;
    --container-padding: var(--spacing-lg);

    /* Breakpoints */
    --breakpoint-sm: 576px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 992px;
    --breakpoint-xl: 1200px;
}

/* ================================
   2. Base Styles
   ================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

img, svg {
    max-width: 100%;
    height: auto;
    vertical-align: middle;
}

ul, ol {
    list-style: none;
}

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

a:hover {
    color: var(--color-button);
}

button {
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
    color: inherit;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
}

input, button, textarea, select {
    font: inherit;
    color: inherit;
}

textarea {
    resize: vertical;
}

iframe {
    border: 0;
}

/* No scrolling when mobile menu is open */
body.no-scroll {
    overflow: hidden;
}

/* ================================
   3. Typography
   ================================ */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

h1 {
    font-size: var(--font-size-3xl);
}

h2 {
    font-size: var(--font-size-2xl);
}

h3 {
    font-size: var(--font-size-xl);
}

h4 {
    font-size: var(--font-size-lg);
}

h5 {
    font-size: var(--font-size-md);
}

h6 {
    font-size: var(--font-size-base);
}

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

p:last-child {
    margin-bottom: 0;
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    position: relative;
    padding-bottom: var(--spacing-md);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background-color: var(--color-accent);
}

/* ================================
   4. Layout & Grid
   ================================ */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

section {
    padding: var(--spacing-3xl) 0;
}

section:nth-child(even) {
    background-color: var(--color-dark);
}

.intro__content,
.contact__content,
.gear__content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
}

.trails__grid,
.stories__grid,
.benefits__grid,
.wellness__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    position: relative;
}

@media (min-width: 768px) {
    .intro__content,
    .contact__content,
    .gear__content {
        grid-template-columns: 1fr 1fr;
        align-items: center;
    }
    
    .trails__grid,
    .stories__grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .benefits__grid,
    .wellness__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 992px) {
    .trails__grid,
    .stories__grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .benefits__grid,
    .wellness__grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* ================================
   5. Header
   ================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--color-background);
    box-shadow: var(--shadow-md);
    z-index: var(--z-index-fixed);
    transition: background-color var(--transition-normal);
}

.header__container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
    padding: 0 var(--spacing-lg);
}

.header__logo-link {
    display: block;
    height: 40px;
}

.header__logo {
    height: 100%;
    width: auto;
}

.header__nav {
    position: relative;
}

.header__menu-toggle {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 20px;
    z-index: var(--z-index-dropdown);
}

.header__menu-bar {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--color-text);
    transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.header__menu-toggle--active .header__menu-bar:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
}

.header__menu-toggle--active .header__menu-bar:nth-child(2) {
    opacity: 0;
}

.header__menu-toggle--active .header__menu-bar:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
}

.header__nav-list {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 320px;
    height: 100vh;
    background-color: var(--color-background);
    padding: 100px var(--spacing-xl) var(--spacing-xl);
    box-shadow: var(--shadow-xl);
    overflow-y: auto;
    transition: right var(--transition-normal);
    z-index: var(--z-index-base);
}

.header__nav-list--active {
    right: 0;
}

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

.header__nav-link {
    display: block;
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-medium);
    padding: var(--spacing-sm) 0;
    transition: color var(--transition-normal);
}

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

@media (min-width: 992px) {
    .header__menu-toggle {
        display: none;
    }
    
    .header__nav-list {
        position: static;
        display: flex;
        align-items: center;
        height: auto;
        max-width: none;
        width: auto;
        padding: 0;
        background: none;
        box-shadow: none;
        overflow: visible;
    }
    
    .header__nav-item {
        margin: 0 0 0 var(--spacing-lg);
    }
    
    .header__nav-link {
        font-size: var(--font-size-base);
        padding: 0;
    }
}

/* ================================
   6. Hero Section
   ================================ */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 0 var(--spacing-lg);
    margin-top: 70px; /* Header height */
    background-image: url('../images/img00.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-overlay);
    z-index: var(--z-index-negative);
}

.hero__content {
    max-width: 800px;
    position: relative;
    z-index: var(--z-index-base);
}

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

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

@media (min-width: 768px) {
    .hero__title {
        font-size: var(--font-size-4xl);
    }
    
    .hero__subtitle {
        font-size: var(--font-size-2xl);
    }
}

/* ================================
   7. Intro Section
   ================================ */
.intro__text {
    order: 2;
}

.intro__image {
    order: 1;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.intro__img {
    width: 100%;
    height: auto;
    display: block;
}

@media (min-width: 768px) {
    .intro__text {
        order: 1;
    }
    
    .intro__image {
        order: 2;
    }
}

/* ================================
   8. Trails Section
   ================================ */
.trails__card {
    background-color: var(--color-background);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.trails__card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.trails__image {
    height: 240px;
    overflow: hidden;
}

.trails__img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

.trails__card:hover .trails__img {
    transform: scale(1.05);
}

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

.trails__title {
    margin-bottom: var(--spacing-sm);
}

.trails__difficulty {
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-md);
    color: var(--color-button);
}

.trails__difficulty span {
    font-weight: var(--font-weight-semibold);
}

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

/* ================================
   9. Benefits Section
   ================================ */
.benefits__item {
    text-align: center;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    background-color: var(--color-background);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

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

.benefits__icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-dark);
    border-radius: 50%;
    padding: var(--spacing-md);
}

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

/* ================================
   10. Stories Section
   ================================ */
.stories__card {
    background-color: var(--color-background);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.stories__image {
    height: 240px;
    overflow: hidden;
}

.stories__img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

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

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

.stories__text {
    font-style: italic;
}

/* ================================
   11. Gear Section
   ================================ */
.gear__image {
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.gear__img {
    width: 100%;
    height: auto;
    display: block;
}

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

.gear__title {
    margin-bottom: var(--spacing-md);
    color: var(--color-button);
}

.gear__items {
    padding-left: var(--spacing-xl);
}

.gear__items li {
    position: relative;
    margin-bottom: var(--spacing-sm);
    padding-left: var(--spacing-md);
}

.gear__items li::before {
    content: '';
    position: absolute;
    top: 10px;
    left: 0;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--color-button);
}

.gear__note {
    font-style: italic;
    font-size: var(--font-size-sm);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-button);
}

/* ================================
   12. Wellness Section
   ================================ */
.wellness__item {
    text-align: center;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    background-color: var(--color-background);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

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

.wellness__icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-dark);
    border-radius: 50%;
    padding: var(--spacing-md);
}

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

/* ================================
   13. FAQ Section
   ================================ */
.faq__list {
    max-width: 800px;
    margin: 0 auto;
}

.faq__item {
    margin-bottom: var(--spacing-md);
    border-radius: var(--border-radius-md);
    background-color: var(--color-background);
    overflow: hidden;
}

.faq__question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: var(--spacing-lg);
    text-align: left;
    font-weight: var(--font-weight-semibold);
    transition: background-color var(--transition-normal);
}

.faq__item--active .faq__question {
    background-color: var(--color-accent);
}

.faq__icon {
    transition: transform var(--transition-normal);
}

.faq__item--active .faq__icon {
    transform: rotate(180deg);
}

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

.faq__answer p {
    padding: var(--spacing-lg);
}

/* ================================
   14. Contact Section
   ================================ */
.contact__info {
    order: 2;
}

.contact__form-container {
    order: 1;
}

.contact__item {
    display: flex;
    align-items: flex-start;
    margin-bottom: var(--spacing-lg);
}

.contact__icon {
    margin-right: var(--spacing-md);
    min-width: 24px;
    color: var(--color-button);
}

.contact__text h3 {
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-md);
}

.contact__map {
    margin-top: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.contact__map iframe {
    display: block;
}

.contact__form {
    background-color: var(--color-background);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
}

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

.form__label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: var(--font-weight-medium);
}

.form__input {
    width: 100%;
    padding: var(--spacing-md);
    background-color: var(--color-dark);
    border: 1px solid var(--color-accent);
    border-radius: var(--border-radius-md);
    color: var(--color-text);
    transition: border-color var(--transition-normal);
}

.form__input:focus {
    outline: none;
    border-color: var(--color-button);
}

.form__input--error {
    border-color: var(--color-error);
}

.form__textarea {
    min-height: 150px;
}

.form__group--checkbox {
    display: flex;
    align-items: flex-start;
}

.form__checkbox {
    margin-right: var(--spacing-sm);
    margin-top: 5px;
}

.form__checkbox-label {
    font-size: var(--font-size-sm);
}

.form__checkbox-label a {
    color: var(--color-button);
    text-decoration: underline;
}

.form__button {
    width: 100%;
}

@media (min-width: 768px) {
    .contact__info {
        order: 1;
    }
    
    .contact__form-container {
        order: 2;
    }
}

/* ================================
   15. Legal Pages
   ================================ */
.legal {
    padding-top: calc(70px + var(--spacing-3xl)); /* Header height + padding */
}

.legal__title {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

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

.legal__section {
    margin-bottom: var(--spacing-2xl);
}

.legal__heading {
    color: var(--color-button);
    margin-bottom: var(--spacing-md);
}

.legal__subheading {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

.legal__list {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-xl);
}

.legal__list li {
    position: relative;
    margin-bottom: var(--spacing-sm);
    padding-left: var(--spacing-md);
}

.legal__list li::before {
    content: '';
    position: absolute;
    top: 10px;
    left: 0;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--color-button);
}

.legal__updated {
    text-align: center;
    font-style: italic;
    margin-bottom: var(--spacing-xl);
    font-size: var(--font-size-sm);
}

.legal__back {
    text-align: center;
}

/* ================================
   16. Success Page
   ================================ */
.success {
    padding-top: calc(70px + var(--spacing-3xl)); /* Header height + padding */
    min-height: calc(100vh - 400px); /* Full height minus header and footer */
    display: flex;
    align-items: center;
}

.success__content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
    background-color: var(--color-background);
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
}

.success__icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-dark);
    border-radius: 50%;
    padding: var(--spacing-md);
    color: var(--color-button);
}

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

.success__message {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
}

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

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

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

/* ================================
   17. Footer
   ================================ */
.footer {
    background-color: var(--color-accent);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer__content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer__logo {
    text-align: center;
}

.footer__logo-img {
    max-height: 60px;
    margin-bottom: var(--spacing-md);
}

.footer__tagline {
    font-family: var(--font-heading);
    font-style: italic;
    font-size: var(--font-size-md);
}

.footer__nav {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    text-align: center;
}

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

.footer__nav-item {
    margin-bottom: var(--spacing-sm);
}

.footer__nav-link {
    font-size: var(--font-size-sm);
    transition: color var(--transition-normal);
}

.footer__nav-link:hover {
    color: var(--color-text);
}

.footer__bottom {
    text-align: center;
}

.footer__copyright {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.7);
}

@media (min-width: 576px) {
    .footer__nav {
        grid-template-columns: repeat(2, 1fr);
        text-align: left;
    }
}

@media (min-width: 768px) {
    .footer__content {
        grid-template-columns: 1fr 2fr;
    }
    
    .footer__logo {
        text-align: left;
    }
    
    .footer__nav {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ================================
   18. Buttons & Form Elements
   ================================ */
.button {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--color-button);
    color: var(--color-text);
    font-weight: var(--font-weight-semibold);
    text-align: center;
    border-radius: var(--border-radius-md);
    transition: background-color var(--transition-normal), transform var(--transition-normal);
}

.button:hover {
    background-color: var(--color-button-hover);
    color: var(--color-text);
    transform: translateY(-2px);
}

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

.button--outline:hover {
    background-color: var(--color-button);
}

/* ================================
   19. Back to Top Button
   ================================ */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 50px;
    height: 50px;
    background-color: var(--color-button);
    color: var(--color-text);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: opacity var(--transition-normal), visibility var(--transition-normal), transform var(--transition-normal), background-color var(--transition-normal);
    z-index: var(--z-index-fixed);
}

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

.back-to-top:hover {
    background-color: var(--color-button-hover);
}

/* ================================
   20. Utilities
   ================================ */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ================================
   21. Media Queries
   ================================ */
@media (min-width: 576px) {
    h1 {
        font-size: var(--font-size-3xl);
    }
    
    h2 {
        font-size: var(--font-size-2xl);
    }
}

@media (min-width: 768px) {
    section {
        padding: var(--spacing-4xl) 0;
    }
    
    h1 {
        font-size: var(--font-size-4xl);
    }
    
    h2 {
        font-size: var(--font-size-3xl);
    }
}

@media (min-width: 992px) {
    :root {
        --container-padding: var(--spacing-xl);
    }
}