/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Premium Dark Color Palette */
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-tertiary: #1a1a1a;
    --bg-card: rgba(255, 255, 255, 0.03);
    --bg-card-hover: rgba(255, 255, 255, 0.06);
    --bg-glass: rgba(255, 255, 255, 0.08);
    
    /* Premium Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #e8e8e8;
    --text-muted: #a0a0a0;
    --text-accent: #667eea;
    
    /* Premium Gradient Accents */
    --accent-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --accent-secondary: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    --accent-danger: linear-gradient(135deg, #ff6b6b 0%, #ee5a24 100%);
    --accent-gold: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    
    /* Premium Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    --glass-shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.5);
    
    /* Premium Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    
    /* Premium Border Radius */
    --radius-sm: 12px;
    --radius-md: 16px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --radius-xxl: 36px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 50%, var(--bg-tertiary) 100%);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    font-weight: 400;
    letter-spacing: -0.01em;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    width: 100%;
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: var(--spacing-xxl);
    padding: var(--spacing-xl) 0;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.logo-icon {
    width: 56px;
    height: 56px;
    background: var(--accent-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--text-primary);
    box-shadow: var(--glass-shadow);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(20px);
}

.header h1 {
    font-size: 3.5rem;
    font-weight: 800;
    background: var(--accent-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
    letter-spacing: -0.02em;
    line-height: 1.1;
}

.tagline {
    font-size: 1.3rem;
    color: var(--text-secondary);
    font-weight: 400;
    margin: 0;
    letter-spacing: 0.01em;
    opacity: 0.9;
}

/* Main content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.converter-card {
    background: var(--glass-bg);
    backdrop-filter: blur(30px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xxl);
    box-shadow: var(--glass-shadow);
    padding: var(--spacing-xxl);
    max-width: 900px;
    width: 100%;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.converter-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    opacity: 0;
    transition: opacity 0.4s ease;
    pointer-events: none;
}

.converter-card:hover {
    background: var(--bg-card-hover);
    transform: translateY(-4px);
    box-shadow: var(--glass-shadow-hover);
}

.converter-card:hover::before {
    opacity: 1;
}

/* Drop area */
.drop-area {
    border: 2px dashed var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xxl);
    text-align: center;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    background: rgba(255, 255, 255, 0.02);
    position: relative;
    overflow: hidden;
}

.drop-area::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.drop-area.highlight {
    border-color: #667eea;
    background: rgba(102, 126, 234, 0.08);
    transform: scale(1.02);
}

.drop-area.highlight::before {
    opacity: 1;
}

.drop-icon {
    margin-bottom: var(--spacing-lg);
    color: var(--text-secondary);
    opacity: 0.8;
}

.drop-area h3 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.01em;
}

.drop-area p {
    color: var(--text-muted);
    margin: var(--spacing-md) 0;
    font-size: 1.1rem;
    font-weight: 400;
}

.file-input-label {
    display: inline-block;
    background: var(--accent-primary);
    color: var(--text-primary);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    margin: var(--spacing-lg) 0;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-weight: 600;
    font-size: 1.1rem;
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
}

.file-input-label:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(102, 126, 234, 0.4);
}

.file-types {
    font-size: 1rem;
    color: var(--text-muted);
    margin-top: var(--spacing-lg);
    font-weight: 400;
    opacity: 0.8;
}

/* Video preview */
.video-preview-container {
    text-align: center;
}

.video-wrapper {
    position: relative;
    margin-bottom: var(--spacing-xl);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--glass-shadow);
    background: var(--bg-tertiary);
}

#video-preview {
    max-width: 100%;
    max-height: 450px;
    width: 100%;
    border-radius: var(--radius-lg);
    background: var(--bg-tertiary);
}

.video-overlay {
    position: absolute;
    top: var(--spacing-md);
    left: var(--spacing-md);
    right: var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.file-info {
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(20px);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    border: 1px solid var(--glass-border);
}

.file-icon {
    font-size: 1.1rem;
}

.file-name {
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 500;
    word-break: break-all;
    letter-spacing: 0.01em;
}

/* Trim controls */
.trim-controls {
    background: var(--glass-bg);
    backdrop-filter: blur(30px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--glass-shadow);
    position: relative;
    overflow: hidden;
}

.trim-controls::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
    opacity: 0;
    transition: opacity 0.4s ease;
    pointer-events: none;
}

.trim-controls:hover::before {
    opacity: 1;
}

.trim-controls h3 {
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.trim-input-group {
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.trim-input-group label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    font-size: 1.1rem;
}

.label-text {
    font-size: 1.1rem;
    font-weight: 500;
}

.time-value {
    font-weight: 700;
    color: var(--text-accent);
    font-size: 1rem;
    background: var(--accent-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.range-slider {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
    transition: all 0.3s ease;
}

.range-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    background: var(--accent-primary);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
    border: 2px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
}

.range-slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 16px rgba(102, 126, 234, 0.5);
}

.range-slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
    background: var(--accent-primary);
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
    transition: all 0.3s ease;
}

.range-slider::-moz-range-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 16px rgba(102, 126, 234, 0.5);
}

/* Buttons */
.btn {
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 1.1rem;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    font-family: inherit;
    letter-spacing: 0.01em;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.btn:hover::before {
    opacity: 1;
}

.btn-primary {
    background: var(--accent-primary);
    color: var(--text-primary);
    box-shadow: 0 6px 24px rgba(102, 126, 234, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 32px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: var(--glass-bg);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(20px);
}

.btn-secondary:hover {
    background: var(--bg-card-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.2);
}

.btn-icon {
    font-size: 1.2rem;
}

/* Conversion status */
.conversion-status {
    text-align: center;
    padding: var(--spacing-xxl);
}

.loader-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
}

.loader {
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top: 3px solid #667eea;
    border-radius: 50%;
    width: 70px;
    height: 70px;
    animation: spin 1.2s linear infinite;
}

.loader-text {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 1.2rem;
    letter-spacing: 0.01em;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Download container */
.download-container {
    text-align: center;
    padding: var(--spacing-xxl);
}

.success-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-lg);
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.3));
}

.download-container h3 {
    color: var(--text-primary);
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.01em;
}

.download-container p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    font-size: 1.1rem;
    font-weight: 400;
}

.download-actions {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    flex-wrap: wrap;
}

/* Error container */
.error-container {
    text-align: center;
    padding: var(--spacing-xxl);
}

.error-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-lg);
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.3));
}

.error-container h3 {
    color: var(--text-primary);
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.01em;
}

.error-message {
    color: #ff6b6b;
    margin-bottom: var(--spacing-xl);
    font-weight: 500;
    font-size: 1.1rem;
}

/* Footer */
.footer {
    text-align: center;
    margin-top: var(--spacing-xxl);
    padding: var(--spacing-xl) 0;
}

.footer-content p {
    color: var(--text-muted);
    font-size: 1rem;
    font-weight: 400;
    opacity: 0.8;
    margin-bottom: var(--spacing-md);
}

.creator-info {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--glass-border);
}

.creator-name {
    color: var(--text-secondary);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    letter-spacing: 0.02em;
}

.creator-tagline {
    color: var(--text-accent);
    font-size: 1rem;
    font-weight: 500;
    font-style: italic;
    background: var(--accent-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 0.01em;
    opacity: 0.9;
}

/* Utility classes */
.hidden {
    display: none;
}

/* Responsive styles */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-md);
    }
    
    .header h1 {
        font-size: 2.8rem;
    }
    
    .converter-card {
        padding: var(--spacing-xl);
    }
    
    .drop-area {
        padding: var(--spacing-xl);
    }
    
    .btn {
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: 1rem;
    }
    
    .download-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .trim-controls {
        padding: var(--spacing-lg);
    }
    
    .trim-input-group {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .trim-input-group label {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    
    .range-slider {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 2.2rem;
    }
    
    .logo {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .converter-card {
        padding: var(--spacing-lg);
    }
    
    .drop-area {
        padding: var(--spacing-lg);
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .logo-icon {
        width: 48px;
        height: 48px;
        font-size: 1.5rem;
    }
}