/* ==========================================================================
   ROTARY PROJECT - Premium White Style
   AI în Educație - Rotary Club Suceava Cetate
   ========================================================================== */

/* CSS Variables - Rotary Brand Colors */
:root {
    /* Primary Colors */
    --rotary-royal-blue: #17458F;
    --rotary-gold: #F7A81B;
    --rotary-azure: #0067C8;
    
    /* Neutrals */
    --white: #FFFFFF;
    --cloud: #F7F9FC;
    --cloud-dark: #EEF2F7;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-800: #1F2937;
    --gray-900: #111827;
    
    /* Semantic */
    --success: #059669;
    --error: #DC2626;
    
    /* Typography */
    --font-primary: 'Open Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-secondary: Georgia, 'Times New Roman', serif;
    
    /* Spacing Scale */
    --space-1: 0.25rem;   /* 4px */
    --space-2: 0.5rem;    /* 8px */
    --space-3: 0.75rem;   /* 12px */
    --space-4: 1rem;      /* 16px */
    --space-5: 1.25rem;   /* 20px */
    --space-6: 1.5rem;    /* 24px */
    --space-8: 2rem;      /* 32px */
    --space-10: 2.5rem;   /* 40px */
    --space-12: 3rem;     /* 48px */
    --space-16: 4rem;     /* 64px */
    --space-20: 5rem;     /* 80px */
    --space-24: 6rem;     /* 96px */
    
    /* Layout */
    --max-width: 1120px;
    --header-height: 72px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
}

/* ==========================================================================
   Reset & Base Styles
   ========================================================================== */

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height);
}

@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;
    }
}

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    color: var(--rotary-royal-blue);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--rotary-azure);
}

/* Focus States */
:focus-visible {
    outline: 2px solid var(--rotary-royal-blue);
    outline-offset: 2px;
}

/* Skip Link */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-4);
    padding: var(--space-3) var(--space-4);
    background: var(--rotary-royal-blue);
    color: var(--white);
    border-radius: var(--radius);
    z-index: 1000;
    font-weight: 600;
}

.skip-link:focus {
    top: var(--space-4);
    color: var(--white);
}

/* ==========================================================================
   Layout
   ========================================================================== */

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

@media (max-width: 640px) {
    .container {
        padding: 0 var(--space-4);
    }
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--white);
    border-bottom: 1px solid rgba(23, 69, 143, 0.1);
    z-index: 100;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    color: var(--gray-900);
    font-weight: 600;
    font-size: 1.125rem;
}

.nav-logo:hover {
    color: var(--rotary-royal-blue);
}

.nav-logo-icon {
    flex-shrink: 0;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: var(--space-2);
}

.nav-toggle-bar {
    width: 24px;
    height: 2px;
    background: var(--gray-700);
    border-radius: var(--radius-full);
    transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
    opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    list-style: none;
}

.nav-link {
    display: block;
    padding: var(--space-2) var(--space-3);
    color: var(--gray-600);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius);
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-link:hover {
    color: var(--rotary-royal-blue);
    background: rgba(23, 69, 143, 0.05);
}

@media (max-width: 1024px) {
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: absolute;
        top: var(--header-height);
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: var(--space-4);
        background: var(--white);
        border-bottom: 1px solid var(--gray-200);
        box-shadow: var(--shadow-lg);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-10px);
        transition: opacity var(--transition-base), transform var(--transition-base), visibility var(--transition-base);
    }
    
    .nav-menu.is-open {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }
    
    .nav-link {
        padding: var(--space-3) var(--space-4);
        font-size: 1rem;
    }
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-family: var(--font-primary);
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.5;
    text-align: center;
    border-radius: var(--radius);
    border: 2px solid transparent;
    cursor: pointer;
    transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn:focus-visible {
    outline: 2px solid var(--rotary-royal-blue);
    outline-offset: 2px;
}

.btn:active {
    transform: translateY(1px);
}

.btn-primary {
    background: var(--rotary-royal-blue);
    color: var(--white);
    border-color: var(--rotary-royal-blue);
}

.btn-primary:hover {
    background: var(--rotary-azure);
    border-color: var(--rotary-azure);
    color: var(--white);
}

.btn-secondary {
    background: var(--white);
    color: var(--rotary-royal-blue);
    border-color: var(--rotary-royal-blue);
}

.btn-secondary:hover {
    background: rgba(23, 69, 143, 0.05);
    color: var(--rotary-royal-blue);
}

.btn-submit {
    width: 100%;
}

/* ==========================================================================
   Sections
   ========================================================================== */

.section {
    padding: var(--space-20) 0;
}

.section-alt {
    background: var(--cloud);
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-12);
}

.section-title {
    font-family: var(--font-primary);
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    font-weight: 700;
    color: var(--gray-900);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-4);
}

.section-title-badge {
    display: inline-block;
    padding: var(--space-1) var(--space-3);
    background: var(--rotary-gold);
    color: var(--gray-900);
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: var(--radius-full);
    vertical-align: middle;
    margin-left: var(--space-2);
}

.section-title-line {
    width: 60px;
    height: 3px;
    background: var(--rotary-gold);
    margin: 0 auto;
    border-radius: var(--radius-full);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero {
    padding-top: calc(var(--header-height) + var(--space-16));
    padding-bottom: var(--space-20);
    background: linear-gradient(180deg, var(--white) 0%, var(--cloud) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 20%;
    right: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(247, 168, 27, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: 10%;
    left: -5%;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(23, 69, 143, 0.05) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-600);
    margin-bottom: var(--space-8);
    box-shadow: var(--shadow-sm);
}

.hero-badge-dot {
    width: 8px;
    height: 8px;
    background: var(--rotary-gold);
    border-radius: var(--radius-full);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero-title {
    font-family: var(--font-primary);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    color: var(--gray-900);
    text-transform: uppercase;
    letter-spacing: 0.02em;
    line-height: 1.2;
    margin-bottom: var(--space-6);
}

.hero-subtitle {
    font-family: var(--font-secondary);
    font-size: clamp(1.125rem, 2.5vw, 1.375rem);
    color: var(--gray-600);
    line-height: 1.7;
    margin-bottom: var(--space-8);
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-4);
    margin-bottom: var(--space-10);
}

.hero-accent-line {
    width: 80px;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--rotary-gold), transparent);
    margin: 0 auto var(--space-10);
}

.hero-highlights {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-6);
    list-style: none;
}

.hero-highlight {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--gray-700);
}

.hero-highlight-icon {
    flex-shrink: 0;
}

@media (max-width: 640px) {
    .hero-highlights {
        flex-direction: column;
        align-items: center;
        gap: var(--space-3);
    }
}

/* ==========================================================================
   About Section
   ========================================================================== */

.about-content {
    max-width: 720px;
    margin: 0 auto;
    text-align: center;
}

.about-icon {
    margin-bottom: var(--space-8);
}

.about-text {
    font-family: var(--font-secondary);
    font-size: 1.25rem;
    line-height: 1.8;
    color: var(--gray-700);
}

/* ==========================================================================
   Problem Section
   ========================================================================== */

.problem-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-12);
    align-items: start;
}

@media (max-width: 768px) {
    .problem-grid {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }
}

.problem-list {
    list-style: none;
}

.problem-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
    padding: var(--space-4) 0;
    border-bottom: 1px solid var(--gray-200);
    font-size: 1.0625rem;
    color: var(--gray-700);
}

.problem-item:last-child {
    border-bottom: none;
}

.problem-icon {
    flex-shrink: 0;
    margin-top: 2px;
}

.problem-callout {
    padding: var(--space-8);
    background: var(--white);
    border-left: 4px solid var(--rotary-gold);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
}

.problem-callout-icon {
    margin-bottom: var(--space-4);
}

.problem-callout p {
    font-family: var(--font-secondary);
    font-size: 1.25rem;
    font-style: italic;
    line-height: 1.7;
    color: var(--gray-800);
}

/* ==========================================================================
   Objectives Section
   ========================================================================== */

.objectives-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
}

@media (max-width: 1024px) {
    .objectives-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .objectives-grid {
        grid-template-columns: 1fr;
    }
}

.objective-card {
    padding: var(--space-8);
    background: var(--white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow);
    transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.objective-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.objective-card-highlight {
    background: linear-gradient(135deg, var(--rotary-royal-blue), var(--rotary-azure));
    color: var(--white);
}

.objective-card-highlight .objective-number {
    background: rgba(255, 255, 255, 0.2);
    color: var(--white);
}

.objective-card-highlight .objective-title,
.objective-card-highlight .objective-text {
    color: var(--white);
}

.objective-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: rgba(23, 69, 143, 0.1);
    color: var(--rotary-royal-blue);
    font-size: 1.125rem;
    font-weight: 700;
    border-radius: var(--radius);
    margin-bottom: var(--space-4);
}

.objective-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--space-3);
}

.objective-text {
    font-size: 0.9375rem;
    line-height: 1.7;
    color: var(--gray-600);
}

/* ==========================================================================
   Activities Section
   ========================================================================== */

.activities-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
}

@media (max-width: 1024px) {
    .activities-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .activities-grid {
        grid-template-columns: 1fr;
    }
}

.activity-card {
    padding: var(--space-8);
    background: var(--cloud);
    border-radius: var(--radius-md);
    text-align: center;
    transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.activity-card:hover {
    background: var(--white);
    box-shadow: var(--shadow-md);
}

.activity-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 72px;
    height: 72px;
    background: var(--white);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-5);
    box-shadow: var(--shadow-sm);
}

.activity-title {
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--space-2);
}

.activity-text {
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--gray-600);
}

/* ==========================================================================
   Pilot Section
   ========================================================================== */

.pilot-content {
    max-width: 720px;
    margin: 0 auto;
    text-align: center;
}

.pilot-icon {
    margin-bottom: var(--space-8);
}

.pilot-text {
    font-family: var(--font-secondary);
    font-size: 1.25rem;
    line-height: 1.8;
    color: var(--gray-700);
    margin-bottom: var(--space-8);
}

.pilot-badges {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-4);
}

.pilot-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--rotary-royal-blue);
    box-shadow: var(--shadow-sm);
}

/* ==========================================================================
   Policy Section
   ========================================================================== */

.policy-content {
    max-width: 720px;
    margin: 0 auto;
}

.policy-list {
    list-style: none;
    margin-bottom: var(--space-10);
}

.policy-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
    padding: var(--space-5);
    background: var(--cloud);
    border-radius: var(--radius);
    margin-bottom: var(--space-4);
    font-size: 1.0625rem;
    color: var(--gray-700);
    transition: background-color var(--transition-fast);
}

.policy-item:hover {
    background: var(--cloud-dark);
}

.policy-icon {
    flex-shrink: 0;
}

.policy-motto {
    text-align: center;
    font-family: var(--font-secondary);
    font-size: 1.375rem;
    font-style: italic;
    color: var(--rotary-royal-blue);
    padding-top: var(--space-6);
    border-top: 2px solid var(--rotary-gold);
}

/* ==========================================================================
   Sponsors Section
   ========================================================================== */

.sponsors-intro {
    text-align: center;
    font-size: 1.0625rem;
    color: var(--gray-600);
    margin-bottom: var(--space-10);
}

.sponsors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-6);
    margin-bottom: var(--space-12);
}

.sponsor-card {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-10) var(--space-8);
    background: var(--rotary-royal-blue);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.sponsor-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.sponsor-logo {
    max-height: 48px;
    width: auto;
    object-fit: contain;
    filter: brightness(1);
}

.sponsors-cta {
    text-align: center;
    padding: var(--space-8);
    background: var(--white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow);
}

.sponsors-cta p {
    font-size: 1.125rem;
    color: var(--gray-700);
    margin-bottom: var(--space-4);
}

/* ==========================================================================
   Partners Section
   ========================================================================== */

.partners-content {
    max-width: 480px;
    margin: 0 auto;
    text-align: center;
}

.partner-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-10);
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow);
    margin-bottom: var(--space-6);
    transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.partner-card:hover {
    border-color: var(--rotary-royal-blue);
    box-shadow: var(--shadow-lg);
}

.partner-logo {
    max-height: 60px;
    width: auto;
    object-fit: contain;
}

.partner-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-700);
}

.partners-note {
    font-size: 0.9375rem;
    color: var(--gray-500);
    font-style: italic;
}

/* ==========================================================================
   Contact Section
   ========================================================================== */

.contact-content-centered {
    max-width: 720px;
    margin: 0 auto;
    text-align: center;
}

.contact-subtitle {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--space-4);
}

.contact-text {
    font-size: 1.0625rem;
    color: var(--gray-600);
    margin-bottom: var(--space-10);
}

.contact-methods-centered {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6);
    margin-bottom: var(--space-10);
}

@media (max-width: 640px) {
    .contact-methods-centered {
        grid-template-columns: 1fr;
    }
}

.contact-method-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-8);
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.contact-method-card:hover {
    border-color: var(--rotary-royal-blue);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.contact-method-icon-large {
    margin-bottom: var(--space-2);
}

.contact-method-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.contact-method-name {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
}

.contact-method-value {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--rotary-royal-blue);
}

.contact-cta-btn {
    padding: var(--space-4) var(--space-8);
}


/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
    padding: var(--space-12) 0;
    background: var(--gray-900);
    color: var(--gray-400);
}

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

.footer-copyright {
    font-size: 0.9375rem;
    color: var(--gray-300);
    margin-bottom: var(--space-4);
}

.footer-disclaimer {
    font-size: 0.8125rem;
    color: var(--gray-500);
    max-width: 600px;
    margin: 0 auto;
}

/* ==========================================================================
   Back to Top Button
   ========================================================================== */

.back-to-top {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--rotary-royal-blue);
    color: var(--white);
    border: none;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: opacity var(--transition-base), visibility var(--transition-base), transform var(--transition-base), background-color var(--transition-fast);
    z-index: 50;
}

.back-to-top:hover {
    background: var(--rotary-azure);
}

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

.back-to-top[hidden] {
    display: none;
}

@media (max-width: 640px) {
    .back-to-top {
        bottom: var(--space-4);
        right: var(--space-4);
        width: 44px;
        height: 44px;
    }
}

/* ==========================================================================
   Utilities
   ========================================================================== */

[hidden] {
    display: none !important;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}