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

:root {
    --primary-color: #ff0000;
    --secondary-color: #181818;
    --accent-color: #ffffff;
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    --gradient: linear-gradient(135deg, #ff0000 0%, #cc0000 50%, #181818 100%);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.floating-element {
    position: absolute;
    background: var(--glass-bg);
    border-radius: 50%;
    backdrop-filter: blur(10px);
    animation: float 6s ease-in-out infinite;
}

.floating-element:nth-child(1) {
    width: 80px;
    height: 80px;
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.floating-element:nth-child(2) {
    width: 60px;
    height: 60px;
    top: 60%;
    right: 10%;
    animation-delay: 2s;
}

.floating-element:nth-child(3) {
    width: 100px;
    height: 100px;
    bottom: 20%;
    left: 50%;
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    33% { transform: translateY(-20px) rotate(120deg); }
    66% { transform: translateY(20px) rotate(240deg); }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    padding: 1rem 0;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    animation: slideDown 0.8s ease-out;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent-color);
}

.logo i {
    color: var(--primary-color);
    font-size: 2rem;
}

.nav {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: var(--accent-color);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 25px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.nav-link:hover {
    background: var(--glass-bg);
    transform: translateY(-2px);
}

.nav-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--gradient);
    transition: left 0.3s ease;
    z-index: -1;
}

.nav-link:hover::before {
    left: 0;
}

/* Main Content */
.main {
    padding-top: 120px;
    padding-bottom: 2rem;
}

.hero-section {
    text-align: center;
    margin-bottom: 4rem;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    color: var(--accent-color);
    margin-bottom: 1rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 1s ease-out;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 3rem;
    animation: fadeInUp 1s ease-out 0.2s both;
}

.download-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 3rem;
    box-shadow: var(--shadow);
    max-width: 600px;
    margin: 0 auto;
    animation: fadeInUp 1s ease-out 0.4s both;
    transition: transform 0.3s ease;
}

.download-card:hover {
    transform: translateY(-5px);
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.input-wrapper {
    position: relative;
}

.input-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--primary-color);
    font-size: 1.2rem;
}

.url-input {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    border: 2px solid var(--glass-border);
    border-radius: 15px;
    background: rgba(255, 255, 255, 0.1);
    color: var(--accent-color);
    font-size: 1rem;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.url-input:focus {
    outline: none;
    border-color: var(--primary-color);
    background: rgba(255, 255, 255, 0.15);
    transform: scale(1.02);
}

.url-input::placeholder {
    color: rgba(255, 255, 255, 0.6);
}

.quality-dropdown {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--glass-border);
    border-radius: 15px;
    background: rgba(255, 255, 255, 0.1);
    color: var(--accent-color);
    font-size: 1rem;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    cursor: pointer;
}

.quality-dropdown:focus {
    outline: none;
    border-color: var(--primary-color);
    background: rgba(255, 255, 255, 0.15);
}

.download-button {
    width: 100%;
    padding: 1.2rem 2rem;
    background: var(--gradient);
    color: var(--accent-color);
    border: none;
    border-radius: 15px;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.download-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 24px rgba(255, 0, 0, 0.3);
}

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

.download-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.download-button:hover::before {
    left: 100%;
}

.error-message {
    color: #ff4444;
    font-size: 0.9rem;
    margin-top: 1rem;
    padding: 0.5rem;
    background: rgba(255, 68, 68, 0.1);
    border-radius: 8px;
    border-left: 4px solid #ff4444;
    display: none;
}

.error-message.show {
    display: block;
    animation: shake 0.5s ease-in-out;
}

/* Preview Section */
.preview-section {
    max-width: 600px;
    margin: 3rem auto 0;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.preview-section.hidden {
    display: none;
}

.preview-title {
    color: var(--accent-color);
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    text-align: center;
}

.thumbnail-preview {
    text-align: center;
}

.thumbnail-img {
    max-width: 100%;
    height: auto;
    border-radius: 15px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
    margin-bottom: 1.5rem;
}

.thumbnail-img:hover {
    transform: scale(1.05);
}

.final-download-btn {
    background: var(--gradient);
    color: var(--accent-color);
    border: none;
    padding: 1rem 2rem;
    border-radius: 15px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.final-download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(255, 0, 0, 0.3);
}

/* Features Section */
.features-section {
    margin-top: 5rem;
}

.features-title {
    text-align: center;
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 3rem;
    animation: fadeInUp 1s ease-out;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 2rem;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    animation: fadeInUp 1s ease-out;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.feature-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.feature-card h3 {
    color: var(--accent-color);
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.feature-card p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.6;
}

/* Footer */
.footer {
    background: var(--secondary-color);
    color: var(--accent-color);
    padding: 3rem 0 1rem;
    margin-top: 5rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.6;
    font-size: 0.9rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--glass-border);
    color: rgba(255, 255, 255, 0.6);
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-100%);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
    20%, 40%, 60%, 80% { transform: translateX(5px); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav {
        display: none;
    }
    
    .download-card {
        padding: 2rem 1.5rem;
        margin: 0 1rem;
    }
    
    .input-group {
        gap: 1rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .download-card {
        padding: 1.5rem 1rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
}

/* Loading State */
.loading {
    animation: pulse 1.5s ease-in-out infinite;
}

/* Success Animation */
.success {
    animation: bounceIn 0.6s ease-out;
}

@keyframes bounceIn {
    0% {
        opacity: 0;
        transform: scale(0.3);
    }
    50% {
        opacity: 1;
        transform: scale(1.05);
    }
    70% {
        transform: scale(0.9);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}