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

:root {
    --primary-gradient: linear-gradient(135deg, #000000 0%, #1a1a1a 100%);
    --secondary-gradient: linear-gradient(135deg, #ffffff 0%, #f5f5f5 100%);
    --accent-color: #6366f1;
    --accent-secondary: #ec4899;
    --accent-tertiary: #10b981;
    --text-primary: #000000;
    --text-secondary: #4a4a4a;
    --text-light: #8a8a8a;
    --bg-white: #ffffff;
    --bg-black: #000000;
    --bg-gray-light: #f8f8f8;
    --bg-gray-dark: #1a1a1a;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.25);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #ffffff 0%, #f5f5f5 50%, #e5e5e5 100%);
    background-size: 200% 200%;
    animation: gradientShift 15s ease infinite;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 15px;
    color: var(--text-primary);
    position: relative;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

@keyframes gradientShift {
    0%, 100% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
}

.background-decoration {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.3;
    animation: blobFloat 20s ease-in-out infinite;
}

.blob {
    opacity: 0.15;
}

.blob-1 {
    width: 400px;
    height: 400px;
    background: rgba(0, 0, 0, 0.1);
    top: -100px;
    left: -100px;
    animation-delay: 0s;
}

.blob-2 {
    width: 500px;
    height: 500px;
    background: rgba(99, 102, 241, 0.08);
    bottom: -150px;
    right: -150px;
    animation-delay: 7s;
}

.blob-3 {
    width: 350px;
    height: 350px;
    background: rgba(236, 72, 153, 0.06);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: 14s;
}

@keyframes blobFloat {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(50px, -50px) scale(1.1);
    }
    66% {
        transform: translate(-50px, 50px) scale(0.9);
    }
}

.container {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 24px;
    box-shadow: var(--shadow-xl), 0 0 0 1px rgba(0, 0, 0, 0.05) inset;
    padding: 35px 40px;
    max-width: 800px;
    width: 100%;
    position: relative;
    z-index: 1;
    animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    border: 1px solid rgba(0, 0, 0, 0.08);
    margin: 20px;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.upgrade-indicator {
    position: absolute;
    top: -14px;
    right: 30px;
    background: var(--bg-black);
    color: white;
    padding: 6px 18px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.5px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2), 0 0 0 2px var(--accent-color);
    animation: pulse 2.5s ease-in-out infinite;
    z-index: 10;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1) translateY(0);
        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2), 0 0 0 2px var(--accent-color);
    }
    50% {
        transform: scale(1.05) translateY(-2px);
        box-shadow: 0 12px 32px rgba(99, 102, 241, 0.3), 0 0 0 3px var(--accent-color);
    }
}

.upgrade-icon {
    animation: rotate 3s linear infinite;
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.header-section {
    text-align: center;
    margin-bottom: 30px;
    position: relative;
}

.sparkle-icon {
    font-size: 24px;
    margin-bottom: 10px;
    display: inline-block;
    animation: sparkle 2s ease-in-out infinite;
    filter: drop-shadow(0 0 8px rgba(99, 102, 241, 0.3));
}

@keyframes sparkle {
    0%, 100% {
        transform: scale(1) rotate(0deg);
        opacity: 1;
    }
    50% {
        transform: scale(1.2) rotate(180deg);
        opacity: 0.8;
    }
}

.title {
    font-size: 32px;
    font-weight: 800;
    margin-bottom: 6px;
    color: var(--text-primary);
    letter-spacing: -0.5px;
    line-height: 1.2;
}

.subtitle {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-top: 4px;
}

.logo-comparison {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 25px;
    margin-bottom: 30px;
    padding: 30px 25px;
    background: linear-gradient(135deg, rgba(248, 248, 248, 0.9) 0%, rgba(245, 245, 245, 0.8) 100%);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    position: relative;
    border: 1px solid rgba(0, 0, 0, 0.08);
    box-shadow: var(--shadow-md);
}

.comparison-line {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent 0%, var(--accent-color) 50%, transparent 100%);
    opacity: 0.6;
    border-radius: 24px 24px 0 0;
}

.logo-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    flex: 1;
    max-width: 200px;
}

.logo-link {
    text-decoration: none;
    display: block;
    width: 100%;
    cursor: pointer;
}

.logo-wrapper {
    position: relative;
    width: 100%;
    max-width: 160px;
    background: white;
    padding: 20px;
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    overflow: hidden;
}

.logo-wrapper::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transition: left 0.5s;
}

.logo-wrapper:hover::before {
    left: 100%;
}

.logo-image {
    width: 100%;
    height: auto;
    object-fit: contain;
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    z-index: 1;
}

.old-logo .logo-wrapper {
    opacity: 0.7;
    filter: grayscale(20%);
}

.old-logo .logo-wrapper:hover {
    opacity: 0.9;
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.new-logo .logo-wrapper {
    border: 2px solid var(--accent-color);
    background: white;
}

.new-logo .logo-wrapper:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-xl);
}

.shine-effect {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent 30%, rgba(255, 255, 255, 0.5) 50%, transparent 70%);
    animation: shine 3s infinite;
    z-index: 2;
    pointer-events: none;
}

@keyframes shine {
    0% {
        transform: translateX(-100%) translateY(-100%) rotate(45deg);
    }
    100% {
        transform: translateX(100%) translateY(100%) rotate(45deg);
    }
}

.logo-label {
    font-size: 11px;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.label-icon {
    font-size: 14px;
}

.arrow-transition {
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    animation: slide 2s ease-in-out infinite;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
    flex-shrink: 0;
}

@keyframes slide {
    0%, 100% {
        transform: translateX(0);
    }
    50% {
        transform: translateX(6px);
    }
}

.arrow-transition svg {
    width: 36px;
    height: 36px;
}

.content {
    text-align: center;
}

.message {
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: 30px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    font-weight: 400;
}

.highlight {
    color: var(--accent-secondary);
    font-weight: 600;
}

.button-group {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 28px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    border-radius: 12px;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    cursor: pointer;
    border: none;
    text-align: center;
    min-width: 160px;
    position: relative;
    overflow: hidden;
    letter-spacing: 0.2px;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn span,
.btn svg {
    position: relative;
    z-index: 1;
}

.btn svg {
    transition: transform 0.3s ease;
}

.btn-primary {
    background: var(--bg-black);
    color: white;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    border: 2px solid var(--bg-black);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(99, 102, 241, 0.25), 0 0 0 1px var(--accent-color);
    background: var(--bg-gray-dark);
    border-color: var(--accent-color);
}

.btn-primary svg {
    color: var(--accent-color);
    transition: color 0.3s ease;
}

.btn-primary:hover svg {
    transform: translateX(4px);
}

.btn-secondary {
    background: white;
    color: var(--bg-black);
    border: 2px solid var(--bg-black);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.btn-secondary:hover {
    background: var(--bg-black);
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(236, 72, 153, 0.2), 0 0 0 1px var(--accent-secondary);
    border-color: var(--accent-secondary);
}

.btn-secondary svg {
    color: var(--accent-secondary);
    transition: color 0.3s ease;
}

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

.btn-secondary:hover svg {
    transform: scale(1.1);
}

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

@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    .container {
        padding: 25px 20px;
        border-radius: 20px;
        margin: 10px;
        max-width: calc(100% - 20px);
    }
    
    .upgrade-indicator {
        top: -12px;
        right: 20px;
        font-size: 10px;
        padding: 5px 14px;
        gap: 6px;
    }
    
    .header-section {
        margin-bottom: 25px;
    }
    
    .sparkle-icon {
        font-size: 20px;
        margin-bottom: 8px;
    }
    
    .title {
        font-size: 26px;
        margin-bottom: 4px;
    }
    
    .subtitle {
        font-size: 11px;
        margin-top: 2px;
    }
    
    .logo-comparison {
        flex-direction: row;
        gap: 15px;
        padding: 20px 15px;
        margin-bottom: 25px;
    }
    
    .logo-item {
        max-width: 140px;
        gap: 10px;
    }
    
    .logo-wrapper {
        max-width: 120px;
        padding: 15px;
    }
    
    .arrow-transition {
        transform: none;
    }
    
    .arrow-transition svg {
        width: 28px;
        height: 28px;
    }
    
    .logo-label {
        font-size: 10px;
    }
    
    .label-icon {
        font-size: 12px;
    }
    
    .message {
        font-size: 14px;
        margin-bottom: 25px;
        line-height: 1.5;
    }
    
    .button-group {
        flex-direction: row;
        gap: 10px;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .btn {
        min-width: 140px;
        padding: 10px 20px;
        font-size: 13px;
        flex: 1;
        max-width: calc(50% - 5px);
    }
    
    .btn svg {
        width: 16px;
        height: 16px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 20px 16px;
        margin: 5px;
    }
    
    .title {
        font-size: 22px;
    }
    
    .subtitle {
        font-size: 10px;
    }
    
    .message {
        font-size: 13px;
    }
    
    .logo-comparison {
        padding: 18px 12px;
        gap: 12px;
    }
    
    .logo-item {
        max-width: 110px;
    }
    
    .logo-wrapper {
        max-width: 100px;
        padding: 12px;
    }
    
    .arrow-transition svg {
        width: 24px;
        height: 24px;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        max-width: 100%;
        min-width: auto;
    }
    
    .upgrade-indicator {
        font-size: 9px;
        padding: 4px 12px;
        right: 16px;
        top: -10px;
    }
}