/* ============================================
   VUBIH - Modern Dark Theme Design System
   ============================================ */

/* ========== CSS Variables ========== */
:root {
    --vu-black: #0E0E0E;
    --vu-black-light: #1A1A1A;
    --vu-yellow: #FFED00;
    --vu-yellow-light: #FFF700;
    --vu-yellow-gradient: linear-gradient(135deg, #FFED00 0%, #FFF700 100%);
    --vu-text-primary: #FFFFFF;
    --vu-text-secondary: #CCCCCC;
    --vu-text-muted: #999999;
    --vu-font-heading: 'Space Grotesk', sans-serif;
    --vu-font-body: 'DM Sans', sans-serif;
    --vu-spacing-xs: 0.5rem;
    --vu-spacing-sm: 1rem;
    --vu-spacing-md: 2rem;
    --vu-spacing-lg: 4rem;
    --vu-spacing-xl: 6rem;
    --vu-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========== Reset & Base Styles ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 18px;
    scroll-behavior: smooth;
}

@media (min-width: 768px) {
    html {
        font-size: 20px;
    }
}

@media (min-width: 1200px) {
    html {
        font-size: 22px;
    }
}

body {
    font-family: var(--vu-font-body);
    font-weight: 400;
    background-color: var(--vu-black);
    color: var(--vu-text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.vu-dark {
    background-color: var(--vu-black);
    color: var(--vu-text-primary);
}

/* ========== Scrollbar Customization ========== */
::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: var(--vu-black);
    border-left: 1px solid rgba(255, 237, 0, 0.1);
}

::-webkit-scrollbar-thumb {
    background: var(--vu-yellow-gradient);
    border-radius: 6px;
    border: 2px solid var(--vu-black);
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #FFF700 0%, #FFED00 100%);
}

/* Firefox scrollbar */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--vu-yellow) var(--vu-black);
}

/* ========== Selection Customization ========== */
::selection {
    background: var(--vu-yellow);
    color: var(--vu-black);
    text-shadow: none;
}

::-moz-selection {
    background: var(--vu-yellow);
    color: var(--vu-black);
    text-shadow: none;
}

/* ========== Typography ========== */
.vu-heading-1 {
    font-family: var(--vu-font-heading);
    font-size: clamp(3rem, 8vw, 6rem);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: var(--vu-spacing-md);
}

.vu-heading-2 {
    font-family: var(--vu-font-heading);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.01em;
    margin-bottom: var(--vu-spacing-md);
}

.vu-heading-3 {
    font-family: var(--vu-font-heading);
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--vu-spacing-sm);
}

.vu-heading-4 {
    font-family: var(--vu-font-heading);
    font-size: clamp(1.25rem, 2vw, 1.75rem);
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: var(--vu-spacing-sm);
}

.vu-text-large {
    font-size: clamp(1.125rem, 1.5vw, 1.5rem);
    line-height: 1.7;
    color: var(--vu-text-secondary);
}

.vu-text-body {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--vu-text-secondary);
}

.vu-text-gradient {
    background: var(--vu-yellow-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

/* ========== Container & Grid System ========== */
.vu-container {
    width: 100%;
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 var(--vu-spacing-md);
}

@media (max-width: 768px) {
    .vu-container {
        padding: 0 var(--vu-spacing-sm);
    }
}

.vu-grid {
    display: grid;
    gap: var(--vu-spacing-md);
}

.vu-grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.vu-grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.vu-grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 1200px) {
    .vu-grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 992px) {

    .vu-grid-2,
    .vu-grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {

    .vu-grid-2,
    .vu-grid-3,
    .vu-grid-4 {
        grid-template-columns: 1fr;
    }
}

/* ========== Header & Navigation ========== */
.vu-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(14, 14, 14, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 237, 0, 0.1);
    transition: var(--vu-transition);
}

.vu-navbar {
    padding: var(--vu-spacing-sm) 0;
}

.vu-navbar-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--vu-spacing-md);
}

.vu-logo {
    display: flex;
    flex-direction: column;
    text-decoration: none;
    transition: var(--vu-transition);
}

.vu-logo:hover {
    transform: translateY(-2px);
}

.vu-logo-text {
    font-family: var(--vu-font-heading);
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    background: var(--vu-yellow-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 0.05em;
}

.vu-logo-subtitle {
    font-size: 0.7rem;
    color: var(--vu-text-muted);
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.vu-nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
}

.vu-nav-toggle span {
    width: 28px;
    height: 3px;
    background: var(--vu-yellow-gradient);
    transition: var(--vu-transition);
    border-radius: 2px;
}

@media (max-width: 768px) {
    .vu-nav-toggle {
        display: flex;
    }

    .vu-nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        height: 100vh;
        background-color: var(--vu-black-light);
        padding: var(--vu-spacing-xl) var(--vu-spacing-md);
        transition: var(--vu-transition);
        box-shadow: -5px 0 20px rgba(0, 0, 0, 0.5);
    }

    .vu-nav-menu.active {
        right: 0;
    }

    .vu-nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(8px, 8px);
    }

    .vu-nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .vu-nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(8px, -8px);
    }
}

.vu-nav-list {
    display: flex;
    list-style: none;
    gap: var(--vu-spacing-md);
    align-items: center;
}

@media (max-width: 768px) {
    .vu-nav-list {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--vu-spacing-md);
    }
}

.vu-nav-link {
    font-family: var(--vu-font-heading);
    font-size: 1rem;
    font-weight: 500;
    color: var(--vu-text-primary);
    text-decoration: none;
    position: relative;
    padding: 0.5rem 0;
    transition: var(--vu-transition);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.vu-nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--vu-yellow-gradient);
    transition: var(--vu-transition);
}

.vu-nav-link:hover {
    color: var(--vu-yellow);
    transform: translateY(-2px);
}

.vu-nav-link:hover::after {
    width: 100%;
}

.vu-nav-link-lang {
    padding: 0.5rem 1rem;
    border: 2px solid var(--vu-yellow);
    border-radius: 4px;
    background: transparent;
}

.vu-nav-link-lang:hover {
    background: var(--vu-yellow-gradient);
    color: var(--vu-black);
    -webkit-text-fill-color: var(--vu-black);
}

.vu-nav-link-lang::after {
    display: none;
}

/* ========== Main Content ========== */
.vu-main {
    margin-top: 80px;
    min-height: calc(100vh - 80px);
}

/* ========== Hero Section ========== */
.vu-hero {
    position: relative;
    min-height: 90vh;
    display: flex;
    align-items: center;
    padding: var(--vu-spacing-xl) 0;
    overflow: hidden;
}

.vu-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, rgba(255, 237, 0, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.vu-hero-video {
    position: absolute;
    top: 30%;
    right: 0%;
    transform: translateY(-50%);
    max-width: 1200px;
    height: auto;
    opacity: 0.55;
    z-index: 0;
    pointer-events: none;
}

@media (max-width: 1200px) {
    .vu-hero-video {
        width: 100%;
        right: -20%;
    }
}

.vu-hero-content {
    position: relative;
    z-index: 1;
    max-width: 1200px;
}

.vu-hero-title {
    font-family: var(--vu-font-heading);
    font-size: clamp(2.5rem, 6vw, 5.5rem);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: var(--vu-spacing-md);
    animation: fadeInUp 0.8s ease-out;
}

@media screen and (max-width: 768px) {
    .vu-hero-title {
        font-size: 37px;
        margin-top: 2rem;
    }

    .vu-hero-cta {
        flex-direction: column;
    }

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

.vu-hero-subtitle {
    font-size: clamp(1.25rem, 2vw, 1.75rem);
    color: var(--vu-text-secondary);
    margin-bottom: var(--vu-spacing-lg);
    animation: fadeInUp 0.8s ease-out 0.2s both;
    max-width: 800px;
}

.vu-hero-cta {
    display: inline-flex;
    gap: var(--vu-spacing-sm);
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

/* ========== Buttons ========== */
.vu-btn {
    font-family: var(--vu-font-heading);
    font-size: 1rem;
    font-weight: 600;
    padding: 1rem 2.5rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: var(--vu-transition);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    position: relative;
    overflow: hidden;
}

.vu-btn-primary {
    background: var(--vu-yellow-gradient);
    color: var(--vu-black);
}

.vu-btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(255, 237, 0, 0.4);
}

.vu-btn-outline {
    background: transparent;
    color: var(--vu-text-primary);
    border: 2px solid var(--vu-yellow);
}

.vu-btn-outline:hover {
    background: var(--vu-yellow-gradient);
    color: var(--vu-black);
    transform: translateY(-3px);
}

/* ========== Section Styles ========== */
.vu-section {
    padding: var(--vu-spacing-xl) 0;
    position: relative;
    overflow: visible;
}

.vu-section-alt {
    background-color: var(--vu-black-light);
}

/* Section overflow for numbered cards */
.vu-section-alt .vu-grid {
    overflow: visible;
}

.vu-section-title {
    font-family: var(--vu-font-heading);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--vu-spacing-lg);
    background: var(--vu-yellow-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ========== Title Animation (Left to Right) ========== */
.vu-title-animated {
    position: relative;
    overflow: hidden;
    opacity: 0;
    transform: translateX(-50px);
    transition: opacity 0.6s ease-out, transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.vu-title-animated.revealed {
    opacity: 1;
    transform: translateX(0);
}

.vu-heading-2.vu-title-animated {
    transform: translateX(-30px);
}

/* ========== Keyword Highlight ========== */
.vu-keyword {
    background: var(--vu-yellow-gradient);
    color: var(--vu-black);
    padding: 0.15em 0.4em;
    border-radius: 3px;
    font-weight: 700;
    display: inline-block;
    transition: var(--vu-transition);
    font-family: var(--vu-font-heading);
    font-size: 0.95em;
    line-height: 1.5;
    box-shadow: 0 2px 8px rgba(255, 237, 0, 0.2);
}

.vu-keyword:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 237, 0, 0.4);
}

.vu-section-subtitle .vu-keyword {
    font-size: 0.9em;
    padding: 0.1em 0.3em;
}

.vu-card-text .vu-keyword {
    font-size: 0.9em;
    padding: 0.1em 0.3em;
}

.vu-text-large .vu-keyword,
.vu-text-body .vu-keyword {
    font-size: 0.95em;
    padding: 0.15em 0.35em;
}

.vu-section-subtitle {
    text-align: center;
    font-size: clamp(1.125rem, 1.5vw, 1.5rem);
    color: var(--vu-text-secondary);
    max-width: 800px;
    margin: 0 auto var(--vu-spacing-lg);
}

/* ========== Link Styles ========== */
a {
    color: var(--vu-text-primary);
    text-decoration: none;
    transition: var(--vu-transition);
}

a:hover,
a:focus {
    color: var(--vu-text-primary);
    text-decoration: none;
}

a:visited {
    color: var(--vu-text-primary);
}

/* ========== Card Styles ========== */
.vu-card {
    background-color: var(--vu-black-light);
    border: 1px solid rgba(255, 237, 0, 0.1);
    border-radius: 8px;
    padding: var(--vu-spacing-md);
    transition: var(--vu-transition);
    position: relative;
    overflow: hidden;
}

.vu-card-numbered {
    overflow: visible;
}

.vu-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--vu-yellow-gradient);
    transform: scaleX(0);
    transition: var(--vu-transition);
}

.vu-card:hover {
    transform: translateY(-5px);
    border-color: rgba(255, 237, 0, 0.3);
    box-shadow: 0 10px 40px rgba(255, 237, 0, 0.1);
}

.vu-card:hover::before {
    transform: scaleX(1);
}

.vu-card-title {
    font-family: var(--vu-font-heading);
    font-size: clamp(1.25rem, 2vw, 1.75rem);
    font-weight: 600;
    margin-bottom: var(--vu-spacing-sm);
    color: var(--vu-text-primary);
}

.vu-card-text {
    color: var(--vu-text-secondary);
    line-height: 1.7;
}

/* ========== Card Tooltip ========== */
.vu-card-with-tooltip {
    position: relative;
    overflow: visible !important;
}

.vu-services-grid {
    overflow: visible;
}

.vu-card-tooltip {
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%) translateY(-10px);
    background: var(--vu-yellow-gradient);
    color: var(--vu-black);
    padding: 0.5rem 1.25rem;
    border-radius: 4px;
    font-family: var(--vu-font-heading);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: var(--vu-transition);
    z-index: 10;
    box-shadow: 0 4px 15px rgba(255, 237, 0, 0.3);
}

.vu-card-tooltip::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-top: 6px solid var(--vu-yellow);
}

.vu-card-with-tooltip:hover .vu-card-tooltip {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ========== Card Numbered ========== */
.vu-card-numbered {
    position: relative;
    padding-top: calc(var(--vu-spacing-md) + 2.5rem);
    overflow: visible !important;
}

.vu-card-number {
    position: absolute;
    top: -25px;
    left: var(--vu-spacing-md);
    width: 50px;
    height: 50px;
    background: var(--vu-yellow-gradient);
    color: var(--vu-black);
    font-family: var(--vu-font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    box-shadow: 0 4px 15px rgba(255, 237, 0, 0.3);
    z-index: 10;
}

@media (max-width: 768px) {
    .vu-card-number {
        width: 40px;
        height: 40px;
        font-size: 1.25rem;
        top: -12px;
    }
}

/* ========== Card with Icon ========== */
.vu-card-with-icon {
    position: relative;
    overflow: visible;
}

.vu-card-icon {
    position: absolute;
    top: var(--vu-spacing-md);
    right: var(--vu-spacing-md);
    font-size: 2rem;
    background: var(--vu-yellow-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    opacity: 0.8;
    transition: var(--vu-transition);
    z-index: 2;
}

.vu-card-with-icon:hover .vu-card-icon {
    opacity: 1;
    transform: scale(1.1) rotate(5deg);
}

/* ========== Services Grid ========== */
.vu-services-grid .vu-card {
    min-height: 220px;
}

@media (min-width: 1200px) {
    .vu-services-grid .vu-card {
        min-height: 240px;
    }
}

/* ========== List Styles ========== */
.vu-list {
    list-style: none;
    padding: 0;
}

.vu-list-item {
    padding: var(--vu-spacing-sm) 0;
    padding-left: var(--vu-spacing-md);
    position: relative;
    color: var(--vu-text-secondary);
}

.vu-list-item::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--vu-yellow);
    font-weight: bold;
}

/* ========== Footer ========== */
.vu-footer {
    background-color: var(--vu-black-light);
    border-top: 1px solid rgba(255, 237, 0, 0.1);
    padding: var(--vu-spacing-xl) 0 var(--vu-spacing-md);
    margin-top: var(--vu-spacing-xl);
    position: relative;
    overflow: visible;
    /* Tooltip'in üstten taşmasını görünür kılmak için */
}

.vu-footer-logo-col {
    position: relative;
    overflow: visible;
    /* Tooltip'in görünür olması için */
}

.vu-footer-logo-pointer {
    position: absolute;
    top: -132px;
    left: 50px;
    width: 0;
    height: 0;
    border-left: 40px solid transparent;
    border-right: 40px solid transparent;
    border-bottom: 80px solid var(--vu-yellow);
    z-index: 10;
    filter: drop-shadow(0 8px 20px rgba(255, 237, 0, 0.5));
    transform: translateY(0);
    transform: rotate(180deg);
}

.vu-footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--vu-spacing-lg);
    margin-bottom: var(--vu-spacing-lg);
}

.vu-footer-title {
    font-family: var(--vu-font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--vu-yellow-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--vu-spacing-sm);
}

.vu-footer-heading {
    font-family: var(--vu-font-heading);
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--vu-spacing-sm);
    color: var(--vu-text-primary);
}

.vu-footer-text {
    color: var(--vu-text-secondary);
    margin-bottom: var(--vu-spacing-xs);
    line-height: 1.7;
}

.vu-footer-social {
    display: flex;
    flex-direction: column;
    gap: var(--vu-spacing-xs);
}

.vu-social-link {
    color: var(--vu-text-secondary);
    text-decoration: none;
    transition: var(--vu-transition);
    position: relative;
    display: inline-block;
    padding-left: var(--vu-spacing-sm);
}

.vu-social-link::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--vu-yellow);
    transition: var(--vu-transition);
}

.vu-social-link:hover {
    color: var(--vu-yellow);
    transform: translateX(5px);
}

.vu-footer-bottom {
    text-align: center;
    padding-top: var(--vu-spacing-md);
    border-top: 1px solid rgba(255, 237, 0, 0.1);
    color: var(--vu-text-muted);
    font-size: 0.875rem;
}

.vu-footer-link {
    color: var(--vu-text-secondary);
    text-decoration: none;
    transition: var(--vu-transition);
    position: relative;
}

.vu-footer-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--vu-yellow-gradient);
    transition: var(--vu-transition);
}

.vu-footer-link:hover {
    color: var(--vu-yellow);
}

.vu-footer-link:hover::after {
    width: 100%;
}

/* ========== Animations ========== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.vu-fade-in-up {
    animation: fadeInUp 0.8s ease-out both;
}

.vu-fade-in {
    animation: fadeIn 0.8s ease-out both;
}

/* ========== Utility Classes ========== */
.vu-text-center {
    text-align: center;
}

.vu-text-left {
    text-align: left;
}

.vu-text-right {
    text-align: right;
}

.vu-mt-sm {
    margin-top: var(--vu-spacing-sm);
}

.vu-mt-md {
    margin-top: var(--vu-spacing-md);
}

.vu-mt-lg {
    margin-top: var(--vu-spacing-lg);
}

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

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

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

.vu-pt-sm {
    padding-top: var(--vu-spacing-sm);
}

.vu-pt-md {
    padding-top: var(--vu-spacing-md);
}

.vu-pt-lg {
    padding-top: var(--vu-spacing-lg);
}

.vu-pb-sm {
    padding-bottom: var(--vu-spacing-sm);
}

.vu-pb-md {
    padding-bottom: var(--vu-spacing-md);
}

.vu-pb-lg {
    padding-bottom: var(--vu-spacing-lg);
}

/* ========== Scroll Animations ========== */
@media (prefers-reduced-motion: no-preference) {
    .vu-scroll-reveal {
        opacity: 0;
        transform: translateY(50px);
        transition: opacity 0.8s ease-out, transform 0.8s ease-out;
    }

    .vu-scroll-reveal.revealed {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========== Scroll to Top Button ========== */
.vu-scroll-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 56px;
    height: 56px;
    background: var(--vu-yellow-gradient);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--vu-transition);
    z-index: 999;
    box-shadow: 0 4px 20px rgba(255, 237, 0, 0.3);
}

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

.vu-scroll-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(255, 237, 0, 0.5);
}

.vu-scroll-top::before {
    content: '↑';
    font-size: 24px;
    font-weight: bold;
    color: var(--vu-black);
    font-family: var(--vu-font-heading);
    line-height: 1;
}

@media (max-width: 768px) {
    .vu-scroll-top {
        bottom: 1.5rem;
        right: 1.5rem;
        width: 48px;
        height: 48px;
    }

    .vu-scroll-top::before {
        font-size: 20px;
    }
}