:root {
    /* Premium Color Palette */
    --primary-color: #FF6B9D;
    --secondary-color: #C871FF;
    --accent-color: #FF4D4D;
    --dark-bg: #0f172a;
    --card-bg: rgba(255, 255, 255, 0.95);
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --success-color: #10b981;
    --gradient-primary: linear-gradient(135deg, #FF6B9D 0%, #C871FF 100%);
    --gradient-bg: linear-gradient(135deg, #FFF0F5 0%, #F0F4FF 100%);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Inter', sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--gradient-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Background Effects */
.background-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: var(--gradient-bg);
}

.background-shapes .shape {
    position: fixed;
    border-radius: 50%;
    filter: blur(80px);
    z-index: -1;
    opacity: 0.6;
}

.shape-1 {
    top: -10%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: #FFD1E3;
}

.shape-2 {
    bottom: -10%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: #E0C3FC;
}

.shape-3 {
    top: 40%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 400px;
    height: 400px;
    background: #D4E5FF;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    width: 100%;
    box-sizing: border-box;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 0;
    margin-bottom: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
}

.logo span {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

/* Hero Section */
.hero-section {
    text-align: center;
    padding: 3rem 0;
}

.title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.2;
}

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

.subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
}

/* Download Card */
.download-card {
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    max-width: 800px;
    margin: 0 auto 4rem;
    transition: var(--transition);
}

.download-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

.download-form {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    position: relative;
    z-index: 10;
}

.input-wrapper {
    flex: 1;
    position: relative;
}

.input-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

.url-input {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    border: 2px solid #e2e8f0;
    border-radius: var(--radius-lg);
    font-size: 1rem;
    outline: none;
    transition: var(--transition);
    background: white;
    box-sizing: border-box;
}

.url-input:focus {
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(200, 113, 255, 0.2);
}

.download-btn {
    padding: 0 2rem;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    white-space: nowrap;
}

.download-btn:hover {
    opacity: 0.9;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.download-btn svg {
    display: block;
}

.download-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

/* Quick Tips */
.quick-tips {
    display: flex;
    justify-content: center;
    gap: 2rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.tip {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.feature-card {
    background: rgba(255, 255, 255, 0.8);
    padding: 2rem;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition);
    border: 1px solid rgba(255, 255, 255, 0.5);
}

.feature-card:hover {
    transform: translateY(-5px);
    background: white;
    box-shadow: var(--shadow-md);
}

.feature-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    color: white;
}

.feature-icon-1 { background: linear-gradient(135deg, #FF6B9D, #FF8EBD); }
.feature-icon-2 { background: linear-gradient(135deg, #C871FF, #E0C3FC); }
.feature-icon-3 { background: linear-gradient(135deg, #4F46E5, #818CF8); }

.feature-card h3 {
    margin: 0 0 0.75rem;
    color: var(--text-primary);
}

.feature-card p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Messages */
.message {
    padding: 1rem;
    border-radius: var(--radius-lg);
    margin-top: 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    animation: fadeIn 0.3s ease;
}

.message-error { background: #FEF2F2; color: #DC2626; border: 1px solid #FECACA; }
.message-success { background: #ECFDF5; color: #059669; border: 1px solid #A7F3D0; }
.message-info { background: #EFF6FF; color: #2563EB; border: 1px solid #BFDBFE; }

/* Video Preview */
.video-preview {
    margin-top: 2rem;
    border-top: 1px solid #e2e8f0;
    padding-top: 2rem;
}

.video-info {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
    text-align: left;
}

.video-thumbnail {
    width: 120px;
    height: 160px;
    object-fit: cover;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.video-details {
    flex: 1;
}

.video-title {
    font-size: 1.1rem;
    margin: 0 0 0.5rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-author {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.video-stats {
    display: flex;
    gap: 1rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.download-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.download-video-btn {
    flex: 1;
    min-width: 200px;
    padding: 1rem;
    border: none;
    border-radius: var(--radius-lg);
    background: var(--text-primary);
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.download-video-btn:hover {
    transform: translateY(-2px);
    opacity: 0.95;
    box-shadow: var(--shadow-md);
}

/* Footer */
.footer {
    text-align: center;
    padding: 3rem 0;
    margin-top: auto;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-note a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

/* Sticky Banner */
.sticky-banner {
    position: fixed;
    bottom: -100px;
    left: 0;
    width: 100%;
    background: #FF4D4D;
    color: white;
    z-index: 998;
    padding: 0.75rem;
    transition: bottom 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 -4px 6px rgba(0, 0, 0, 0.1);
}

.sticky-banner.show {
    bottom: 0;
}

.sticky-banner-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
    position: relative;
    padding-right: 2rem;
}

.sticky-banner-text {
    font-weight: 600;
    font-size: 1.1rem;
}

.sticky-banner-btn {
    background: white;
    color: #FF4D4D;
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    transition: var(--transition);
    animation: pulse 2s infinite;
}

.sticky-banner-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.sticky-banner-close {
    position: absolute;
    right: 0;
    background: rgba(0, 0, 0, 0.1);
    border: none;
    color: white;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.4); }
    70% { box-shadow: 0 0 0 10px rgba(255, 255, 255, 0); }
    100% { box-shadow: 0 0 0 0 rgba(255, 255, 255, 0); }
}

/* Loading */
.loading {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Responsive */
@media (max-width: 768px) {
    .title { font-size: 2.5rem; }
    .download-form {
        flex-direction: column;
    }
    .download-btn {
        justify-content: center;
        width: 100%;
    }
    .affiliate-banner {
        margin: 2rem 0;
    }
    .floating-ads {
        display: none !important;
    }
}