/* ============================================
   YouTube Stems Separator - Styles
   ============================================ */

:root {
    /* Color Palette */
    --bg-dark: #0a0a0f;
    --bg-card: rgba(255, 255, 255, 0.05);
    --bg-card-hover: rgba(255, 255, 255, 0.08);
    --border-subtle: rgba(255, 255, 255, 0.1);
    --border-hover: rgba(255, 255, 255, 0.2);

    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.6);
    --text-muted: rgba(255, 255, 255, 0.4);

    --accent-primary: #8b5cf6;
    --accent-secondary: #06b6d4;
    --accent-gradient: linear-gradient(135deg, #8b5cf6 0%, #06b6d4 100%);

    --success: #10b981;
    --error: #ef4444;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;
}

/* ============================================
   Reset & Base
   ============================================ */

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

/* ============================================
   Layout
   ============================================ */

.app-container {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-lg);
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
    position: relative;
    z-index: 10;
}

/* ============================================
   Background Effects
   ============================================ */

.bg-gradient {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse at 20% 20%, rgba(139, 92, 246, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(6, 182, 212, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(139, 92, 246, 0.05) 0%, transparent 70%);
    pointer-events: none;
    z-index: 1;
}

.bg-orbs {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: 2;
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 400px;
    height: 400px;
    background: var(--accent-primary);
    top: -100px;
    left: -100px;
    animation-delay: 0s;
}

.orb-2 {
    width: 300px;
    height: 300px;
    background: var(--accent-secondary);
    bottom: -50px;
    right: -50px;
    animation-delay: -7s;
}

.orb-3 {
    width: 200px;
    height: 200px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    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(20px, 10px) scale(1.02);
    }
}

/* ============================================
   Glass Card
   ============================================ */

.glass-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: all var(--transition-normal);
}

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

/* ============================================
   Header
   ============================================ */

.header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding-top: var(--spacing-lg);
}

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

.logo-icon {
    font-size: 2.5rem;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.1);
    }
}

.logo h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 400px;
    margin: 0 auto;
}

/* ============================================
   Input Section
   ============================================ */

.input-section {
    width: 100%;
    padding: var(--spacing-md);
}

.input-wrapper {
    display: flex;
    gap: var(--spacing-sm);
}

#youtube-url {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    outline: none;
    transition: all var(--transition-fast);
}

#youtube-url::placeholder {
    color: var(--text-muted);
}

#youtube-url:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.2);
}

.input-hint {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: var(--spacing-xs);
    text-align: center;
}

/* ============================================
   Buttons
   ============================================ */

.btn-primary {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--accent-gradient);
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(139, 92, 246, 0.4);
}

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

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

.btn-icon {
    font-size: 1.2rem;
    transition: transform var(--transition-fast);
}

.btn-primary:hover .btn-icon {
    transform: translateX(3px);
}

.btn-secondary {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: transparent;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-top: var(--spacing-lg);
}

.btn-secondary:hover {
    background: var(--bg-card);
    border-color: var(--border-hover);
    color: var(--text-primary);
}

.btn-download {
    width: 100%;
    padding: var(--spacing-sm);
    background: var(--accent-gradient);
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-top: auto;
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(139, 92, 246, 0.3);
}

/* ============================================
   Status Section
   ============================================ */

.status-section {
    width: 100%;
    padding: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

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

.loader {
    position: relative;
    width: 50px;
    height: 50px;
}

.loader-ring {
    position: absolute;
    inset: 0;
    border: 3px solid transparent;
    border-radius: 50%;
    animation: spin 1.5s linear infinite;
}

.loader-ring:nth-child(1) {
    border-top-color: var(--accent-primary);
    animation-delay: 0s;
}

.loader-ring:nth-child(2) {
    border-right-color: var(--accent-secondary);
    animation-delay: 0.2s;
    inset: 5px;
}

.loader-ring:nth-child(3) {
    border-bottom-color: var(--accent-primary);
    animation-delay: 0.4s;
    inset: 10px;
}

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

.status-text h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.status-text p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.progress-bar {
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--accent-gradient);
    width: 0%;
    /* Start at 0% */
    transition: width 0.3s ease;
    /* Smooth transition */
}

@keyframes progress-pulse {

    0%,
    100% {
        width: 30%;
        opacity: 1;
    }

    50% {
        width: 70%;
        opacity: 0.7;
    }
}

/* ============================================
   Results Section
   ============================================ */

.results-section {
    width: 100%;
    margin-top: var(--spacing-lg);
    text-align: center;
}

.results-header {
    margin-bottom: var(--spacing-lg);
}

.results-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.results-subtitle {
    color: var(--text-secondary);
}

.stems-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.stem-card {
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    min-height: 200px;
}

.stem-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.stem-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.stem-card p {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: var(--spacing-sm);
}

/* ============================================
   Error Section
   ============================================ */

.error-section {
    width: 100%;
    padding: var(--spacing-lg);
    margin-top: var(--spacing-lg);
    text-align: center;
    border-color: rgba(239, 68, 68, 0.3);
}

.error-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.error-section h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--error);
}

.error-section p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

/* ============================================
   Footer
   ============================================ */

.footer {
    text-align: center;
    padding: var(--spacing-md);
    color: var(--text-muted);
    font-size: 0.85rem;
    position: relative;
    z-index: 10;
}

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

.footer a:hover {
    color: var(--accent-secondary);
}

/* ============================================
   Utility Classes
   ============================================ */

.hidden {
    display: none !important;
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 600px) {
    .main-content {
        padding: var(--spacing-sm);
    }

    .logo h1 {
        font-size: 1.8rem;
    }

    .tagline {
        font-size: 1rem;
    }

    .input-wrapper {
        flex-direction: column;
    }

    .btn-primary {
        justify-content: center;
    }

    .stems-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .project-card {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .project-controls {
        width: 100%;
        justify-content: center;
    }
}

/* ============================================
   Previous Projects Section
   ============================================ */

.projects-section {
    width: 100%;
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-subtle);
}

.projects-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.projects-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.projects-subtitle {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.projects-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.no-projects {
    text-align: center;
    color: var(--text-muted);
    padding: var(--spacing-lg);
}

.project-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    gap: var(--spacing-md);
}

.project-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    flex: 1;
    min-width: 0;
}

.project-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.project-link {
    font-size: 0.8rem;
    color: var(--accent-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.project-link:hover {
    color: var(--accent-secondary);
}

.project-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.play-btn {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--accent-gradient);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.play-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 5px 20px rgba(139, 92, 246, 0.4);
}

.play-icon {
    font-size: 1.2rem;
    color: white;
}

.stems-controls {
    display: flex;
    gap: var(--spacing-xs);
}

.stem-control {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.mute-btn {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.mute-btn:hover:not(.disabled) {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
}

.mute-btn.muted {
    opacity: 0.3;
    background: rgba(255, 255, 255, 0.02);
}

.mute-btn.disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

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

.download-icon-btn {
    width: 24px;
    height: 24px;
    border-radius: 4px;
    background: transparent;
    border: 1px solid var(--border-subtle);
    cursor: pointer;
    font-size: 0.75rem;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.download-icon-btn:hover:not([disabled]) {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
}

.download-icon-btn[disabled] {
    opacity: 0.3;
    cursor: not-allowed;
}

.timeline-container {
    width: 100%;
    margin-top: var(--spacing-sm);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.timeline-slider {
    width: 100%;
    -webkit-appearance: none;
    height: 4px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.1);
    outline: none;
    cursor: pointer;
    position: relative;
}

/* Track fill handled by JS or simple background gradient trick not sufficient for simple range input without JS updating background-size. 
   For simplicity, we'll keep the track background static or use a loaded-progress style if we want complex JS. 
   Let's stick to a simple styled slider first. */

.timeline-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--text-primary);
    cursor: pointer;
    transition: transform var(--transition-fast);
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
    margin-top: -4px;
    /* Center thumb on track */
}

.timeline-slider::-webkit-slider-runnable-track {
    width: 100%;
    height: 4px;
    cursor: pointer;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
}

/* Firefox styles */
.timeline-slider::-moz-range-thumb {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--text-primary);
    cursor: pointer;
    border: none;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
}

.timeline-slider::-moz-range-track {
    width: 100%;
    height: 4px;
    cursor: pointer;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
}

.timeline-slider:hover::-webkit-slider-thumb {
    transform: scale(1.2);
    background: var(--accent-secondary);
}

.timeline-slider:hover::-moz-range-thumb {
    transform: scale(1.2);
    background: var(--accent-secondary);
}

.time-display {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
}