/* ==========================================================================
   YouTube Clipper - Premium Dark Theme
   ========================================================================== */

/* --------------------------------------------------------------------------
   Design Tokens
   -------------------------------------------------------------------------- */
:root {
    /* Colors */
    --color-bg-primary: #0a0a0f;
    --color-bg-secondary: #12121a;
    --color-bg-glass: rgba(20, 20, 30, 0.7);
    --color-bg-glass-hover: rgba(30, 30, 45, 0.8);
    
    --color-accent-primary: #ff3366;
    --color-accent-secondary: #7c3aed;
    --color-accent-tertiary: #06b6d4;
    --color-accent-gradient: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
    
    --color-text-primary: #ffffff;
    --color-text-secondary: rgba(255, 255, 255, 0.7);
    --color-text-muted: rgba(255, 255, 255, 0.4);
    
    --color-border: rgba(255, 255, 255, 0.1);
    --color-border-hover: rgba(255, 255, 255, 0.2);
    
    --color-success: #10b981;
    --color-error: #ef4444;
    --color-warning: #f59e0b;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    
    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(255, 51, 102, 0.3);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}

/* --------------------------------------------------------------------------
   Base Styles
   -------------------------------------------------------------------------- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--color-bg-primary);
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --------------------------------------------------------------------------
   Background Effects
   -------------------------------------------------------------------------- */
.background-effects {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
    overflow: hidden;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.5;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: var(--color-accent-primary);
    top: -200px;
    right: -100px;
    animation-delay: 0s;
}

.orb-2 {
    width: 500px;
    height: 500px;
    background: var(--color-accent-secondary);
    bottom: -150px;
    left: -100px;
    animation-delay: -7s;
}

.orb-3 {
    width: 400px;
    height: 400px;
    background: var(--color-accent-tertiary);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    25% {
        transform: translate(30px, -30px) scale(1.05);
    }
    50% {
        transform: translate(-20px, 20px) scale(0.95);
    }
    75% {
        transform: translate(-30px, -20px) scale(1.02);
    }
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-6);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-8);
}

/* --------------------------------------------------------------------------
   Glass Card Effect
   -------------------------------------------------------------------------- */
.glass-card {
    background: var(--color-bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-8);
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.glass-card:hover {
    border-color: var(--color-border-hover);
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */
.header {
    text-align: center;
    padding: var(--spacing-8) 0;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-4);
}

.logo-icon {
    width: 48px;
    height: 48px;
    color: var(--color-accent-primary);
    animation: pulse 2s ease-in-out infinite;
}

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

.logo h1 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    color: var(--color-text-secondary);
    font-size: var(--font-size-lg);
    font-weight: 300;
}

/* --------------------------------------------------------------------------
   Input Section
   -------------------------------------------------------------------------- */
.input-section {
    padding: var(--spacing-6);
}

.input-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-3);
    border: 1px solid var(--color-border);
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.input-wrapper:focus-within {
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 0 3px rgba(255, 51, 102, 0.2);
}

.input-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    color: var(--color-text-muted);
    flex-shrink: 0;
    margin-left: var(--spacing-2);
}

.input-icon svg {
    width: 100%;
    height: 100%;
}

.url-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    font-family: inherit;
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    padding: var(--spacing-2);
}

.url-input::placeholder {
    color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-6);
    font-family: inherit;
    font-size: var(--font-size-base);
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    white-space: nowrap;
}

.btn-icon {
    width: 20px;
    height: 20px;
    transition: transform var(--transition-base);
}

.btn-primary {
    background: var(--color-accent-gradient);
    color: var(--color-text-primary);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

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

.btn-primary:active {
    transform: translateY(0);
}

.btn-download {
    width: 100%;
    padding: var(--spacing-5) var(--spacing-8);
    font-size: var(--font-size-lg);
    background: var(--color-accent-gradient);
    color: var(--color-text-primary);
    box-shadow: var(--shadow-md);
    border-radius: var(--radius-lg);
}

.btn-download:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.btn-download:active {
    transform: translateY(0);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* --------------------------------------------------------------------------
   Video Section
   -------------------------------------------------------------------------- */
.video-section {
    animation: slideUp 0.5s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.video-container {
    margin-bottom: var(--spacing-8);
}

.video-preview {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%;
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: var(--spacing-4);
}

.video-preview iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.video-info {
    text-align: center;
}

.video-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-2);
    line-height: 1.4;
}

.video-channel {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

/* --------------------------------------------------------------------------
   Clip Controls
   -------------------------------------------------------------------------- */
.clip-controls {
    margin-bottom: var(--spacing-8);
}

.section-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-6);
    color: var(--color-text-primary);
}

.section-icon {
    width: 24px;
    height: 24px;
    color: var(--color-accent-primary);
}

.time-range {
    display: flex;
    align-items: flex-end;
    gap: var(--spacing-4);
    margin-bottom: var(--spacing-6);
}

.time-input-group {
    flex: 1;
}

.time-input-group label {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-2);
}

.time-input-wrapper {
    position: relative;
}

.time-input {
    width: 100%;
    padding: var(--spacing-4);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: var(--font-size-lg);
    color: var(--color-text-primary);
    text-align: center;
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.time-input:focus {
    outline: none;
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 0 3px rgba(255, 51, 102, 0.2);
}

.time-format {
    position: absolute;
    bottom: -20px;
    left: 50%;
    transform: translateX(-50%);
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

.time-separator {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-2);
}

.time-separator svg {
    width: 24px;
    height: 24px;
}

/* Range Slider */
.range-slider-container {
    margin-top: var(--spacing-8);
}

.range-slider {
    position: relative;
    height: 8px;
    background: var(--color-bg-secondary);
    border-radius: var(--radius-full);
    cursor: pointer;
}

.range-track {
    position: absolute;
    height: 100%;
    background: var(--color-accent-gradient);
    border-radius: var(--radius-full);
    left: 0;
    right: 0;
}

.range-thumb {
    position: absolute;
    width: 20px;
    height: 20px;
    background: var(--color-text-primary);
    border: 3px solid var(--color-accent-primary);
    border-radius: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    cursor: grab;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    z-index: 2;
}

.range-thumb:hover {
    transform: translate(-50%, -50%) scale(1.2);
    box-shadow: 0 0 0 6px rgba(255, 51, 102, 0.2);
}

.range-thumb:active {
    cursor: grabbing;
}

.range-thumb-start {
    left: 0%;
}

.range-thumb-end {
    left: 100%;
}

.range-labels {
    display: flex;
    justify-content: space-between;
    margin-top: var(--spacing-3);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   Options Grid
   -------------------------------------------------------------------------- */
.options-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-6);
    margin-bottom: var(--spacing-8);
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.option-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
}

.option-icon {
    width: 18px;
    height: 18px;
    color: var(--color-accent-tertiary);
}

.select-input {
    appearance: none;
    -webkit-appearance: none;
    padding: var(--spacing-4);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    cursor: pointer;
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='rgba(255,255,255,0.5)' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 20px;
    padding-right: 44px;
}

.select-input:focus {
    outline: none;
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 0 3px rgba(255, 51, 102, 0.2);
}

.select-input option {
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
}

/* --------------------------------------------------------------------------
   Download Section
   -------------------------------------------------------------------------- */
.download-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-6);
}

.progress-container {
    padding: var(--spacing-4);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
}

.progress-bar {
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--spacing-3);
}

.progress-fill {
    height: 100%;
    background: var(--color-accent-gradient);
    border-radius: var(--radius-full);
    width: 0%;
    transition: width var(--transition-base);
    animation: progressPulse 1.5s ease-in-out infinite;
}

@keyframes progressPulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

.progress-text {
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

/* --------------------------------------------------------------------------
   Status Section
   -------------------------------------------------------------------------- */
.status-section {
    animation: slideUp 0.3s ease-out;
}

.status-message {
    padding: var(--spacing-4) var(--spacing-6);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    text-align: center;
}

.status-message.success {
    background: rgba(16, 185, 129, 0.15);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: var(--color-success);
}

.status-message.error {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--color-error);
}

.status-message.warning {
    background: rgba(245, 158, 11, 0.15);
    border: 1px solid rgba(245, 158, 11, 0.3);
    color: var(--color-warning);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
    text-align: center;
    padding: var(--spacing-8) var(--spacing-4);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.footer a {
    color: var(--color-accent-tertiary);
    text-decoration: none;
    transition: color var(--transition-base);
}

.footer a:hover {
    color: var(--color-text-primary);
}

/* --------------------------------------------------------------------------
   Utility Classes
   -------------------------------------------------------------------------- */
.hidden {
    display: none !important;
}

/* --------------------------------------------------------------------------
   Responsive Design
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
    :root {
        --font-size-3xl: 1.75rem;
        --font-size-2xl: 1.25rem;
    }
    
    .container {
        padding: var(--spacing-4);
        gap: var(--spacing-6);
    }
    
    .glass-card {
        padding: var(--spacing-6);
    }
    
    .input-wrapper {
        flex-direction: column;
        gap: var(--spacing-3);
        padding: var(--spacing-4);
    }
    
    .input-icon {
        display: none;
    }
    
    .url-input {
        width: 100%;
        text-align: center;
    }
    
    .btn-primary {
        width: 100%;
    }
    
    .time-range {
        flex-direction: column;
        gap: var(--spacing-6);
    }
    
    .time-separator {
        transform: rotate(90deg);
        margin: 0 auto;
    }
    
    .options-grid {
        grid-template-columns: 1fr;
    }
    
    .gradient-orb {
        opacity: 0.3;
    }
    
    .orb-1 {
        width: 300px;
        height: 300px;
    }
    
    .orb-2 {
        width: 250px;
        height: 250px;
    }
    
    .orb-3 {
        width: 200px;
        height: 200px;
    }
}

@media (max-width: 480px) {
    .header {
        padding: var(--spacing-4) 0;
    }
    
    .logo h1 {
        font-size: var(--font-size-2xl);
    }
    
    .logo-icon {
        width: 36px;
        height: 36px;
    }
    
    .tagline {
        font-size: var(--font-size-base);
    }
}