/* 
 * STEM SPLITTER - Audio Alchemy Laboratory
 * A physics lab meets recording studio aesthetic
 */

:root {
    /* Core palette - deep space with neon accents */
    --bg-primary: #0a0b0f;
    --bg-secondary: #12141c;
    --bg-tertiary: #1a1d28;
    --bg-card: #151820;
    
    /* Accent colors - oscilloscope inspired */
    --accent-primary: #00ff88;
    --accent-secondary: #00d4ff;
    --accent-tertiary: #ff6b00;
    --accent-glow: rgba(0, 255, 136, 0.3);
    
    /* Text colors */
    --text-primary: #ffffff;
    --text-secondary: #8892a4;
    --text-muted: #4a5568;
    
    /* Status colors */
    --success: #00ff88;
    --warning: #ffcc00;
    --error: #ff4757;
    
    /* Grid lines */
    --grid-color: rgba(0, 255, 136, 0.05);
    --grid-accent: rgba(0, 255, 136, 0.1);
    
    /* Typography */
    --font-display: 'Orbitron', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
}

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

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

body {
    font-family: var(--font-mono);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
}

/* Animated Grid Background */
.grid-bg {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(var(--grid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-color) 1px, transparent 1px),
        linear-gradient(var(--grid-accent) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-accent) 1px, transparent 1px);
    background-size: 
        100px 100px,
        100px 100px,
        20px 20px,
        20px 20px;
    animation: gridMove 20s linear infinite;
    pointer-events: none;
    z-index: 0;
}

@keyframes gridMove {
    0% { transform: translate(0, 0); }
    100% { transform: translate(20px, 20px); }
}

/* Oscilloscope Background Waves */
.oscilloscope-bg {
    position: fixed;
    top: 50%;
    left: 0;
    width: 100%;
    height: 200px;
    transform: translateY(-50%);
    opacity: 0.1;
    pointer-events: none;
    z-index: 0;
}

.wave {
    fill: none;
    stroke: var(--accent-primary);
    stroke-width: 2;
}

.wave-1 { animation: waveMove1 3s ease-in-out infinite; }
.wave-2 { animation: waveMove2 4s ease-in-out infinite; stroke: var(--accent-secondary); }
.wave-3 { animation: waveMove3 5s ease-in-out infinite; stroke: var(--accent-tertiary); }

@keyframes waveMove1 {
    0%, 100% { d: path("M0,100 Q250,50 500,100 T1000,100"); }
    50% { d: path("M0,100 Q250,150 500,100 T1000,100"); }
}

@keyframes waveMove2 {
    0%, 100% { d: path("M0,100 Q250,150 500,100 T1000,100"); }
    50% { d: path("M0,100 Q250,50 500,100 T1000,100"); }
}

@keyframes waveMove3 {
    0%, 100% { d: path("M0,100 Q250,80 500,100 T1000,100"); }
    50% { d: path("M0,100 Q250,120 500,100 T1000,100"); }
}

/* Container */
.container {
    position: relative;
    z-index: 1;
    max-width: 900px;
    margin: 0 auto;
    padding: var(--space-xl);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-lg) 0;
    border-bottom: 1px solid var(--grid-accent);
    margin-bottom: var(--space-2xl);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.logo-icon {
    width: 50px;
    height: 50px;
    color: var(--accent-primary);
    filter: drop-shadow(0 0 10px var(--accent-glow));
}

.logo-text h1 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 900;
    letter-spacing: 0.2em;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    font-size: 0.7rem;
    color: var(--text-muted);
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

.system-status {
    display: flex;
    align-items: center;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-secondary);
    border: 1px solid var(--grid-accent);
    border-radius: var(--radius-md);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--warning);
    animation: pulse 2s ease-in-out infinite;
}

.status-dot.active {
    background: var(--success);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.status-text {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* Main Content */
.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

/* Drop Zone */
.drop-zone {
    border: 2px dashed var(--text-muted);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--bg-secondary);
    position: relative;
    overflow: hidden;
}

.drop-zone::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at center, var(--accent-glow) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.drop-zone:hover,
.drop-zone.dragover {
    border-color: var(--accent-primary);
    transform: scale(1.01);
}

.drop-zone:hover::before,
.drop-zone.dragover::before {
    opacity: 1;
}

.drop-zone-content {
    position: relative;
    z-index: 1;
}

.drop-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--space-lg);
    color: var(--accent-primary);
    opacity: 0.7;
    transition: all 0.3s ease;
}

.drop-zone:hover .drop-icon {
    opacity: 1;
    transform: translateY(-5px);
}

.drop-zone h2 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    margin-bottom: var(--space-sm);
}

.drop-zone p {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-bottom: var(--space-lg);
}

.format-tags {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.format-tags span {
    padding: var(--space-xs) var(--space-sm);
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    font-size: 0.65rem;
    color: var(--text-secondary);
    letter-spacing: 0.05em;
}

.format-tags .format-etc {
    background: transparent;
    color: var(--accent-primary);
    font-style: italic;
}

/* File Info */
.file-info {
    background: var(--bg-secondary);
    border: 1px solid var(--grid-accent);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.file-visualization {
    height: 80px;
    background: var(--bg-tertiary);
    position: relative;
}

#waveformCanvas {
    width: 100%;
    height: 100%;
}

.file-details {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
}

.file-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border-radius: var(--radius-md);
    font-size: 1.25rem;
}

.file-meta {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.file-name {
    font-weight: 500;
    color: var(--text-primary);
}

.file-size {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.btn-clear {
    width: 32px;
    height: 32px;
    border: none;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-clear:hover {
    background: var(--error);
    color: white;
}

/* Control Panel */
.control-panel {
    background: var(--bg-secondary);
    border: 1px solid var(--grid-accent);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
}

.panel-title {
    font-family: var(--font-display);
    font-size: 0.875rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.panel-icon {
    color: var(--accent-primary);
}

.controls-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.control-label {
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    color: var(--text-muted);
    text-transform: uppercase;
}

.control-hint {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-style: italic;
    margin-top: calc(-1 * var(--space-sm));
    opacity: 0.8;
}

/* Radio Cards */
.radio-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--space-sm);
}

.stem-group {
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
}

.radio-card {
    cursor: pointer;
}

.radio-card input {
    display: none;
}

.radio-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-md);
    background: var(--bg-tertiary);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
    text-align: center;
}

.radio-card:hover .radio-content {
    border-color: var(--text-muted);
}

.radio-card input:checked + .radio-content {
    border-color: var(--accent-primary);
    background: rgba(0, 255, 136, 0.1);
    box-shadow: 0 0 20px var(--accent-glow);
}

/* Featured stem options - vocals & instrumental */
.radio-card.featured .radio-content {
    border-color: var(--text-muted);
    background: linear-gradient(135deg, rgba(0, 255, 136, 0.05), rgba(0, 212, 255, 0.05));
}

.radio-card.featured:hover .radio-content {
    border-color: var(--accent-secondary);
}

.radio-card.featured input:checked + .radio-content {
    border-color: var(--accent-secondary);
    background: linear-gradient(135deg, rgba(0, 255, 136, 0.15), rgba(0, 212, 255, 0.15));
    box-shadow: 0 0 25px rgba(0, 212, 255, 0.3);
}

.radio-icon {
    font-size: 1.25rem;
}

.radio-title {
    font-size: 0.8rem;
    font-weight: 500;
}

.radio-desc {
    font-size: 0.65rem;
    color: var(--text-muted);
}

/* Format Grid */
.format-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

/* Sample Rate Selector */
.sample-rate-selector {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.sr-label {
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--accent-secondary);
    min-width: 80px;
}

.sr-options {
    display: flex;
    gap: var(--space-xs);
    flex-wrap: wrap;
}

.sr-option {
    cursor: pointer;
}

.sr-option input {
    display: none;
}

.sr-option span {
    display: block;
    padding: var(--space-xs) var(--space-sm);
    background: var(--bg-tertiary);
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    font-size: 0.7rem;
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

.sr-option:hover span {
    border-color: var(--text-muted);
    color: var(--text-primary);
}

.sr-option input:checked + span {
    background: var(--accent-secondary);
    color: var(--bg-primary);
    border-color: var(--accent-secondary);
}

.sr-option.hires span {
    background: linear-gradient(135deg, var(--bg-tertiary), rgba(255, 107, 0, 0.1));
}

.sr-option.hires input:checked + span {
    background: linear-gradient(135deg, var(--accent-tertiary), #ff8c00);
    border-color: var(--accent-tertiary);
}

/* Format Type Selector (tabs) */
.format-type-selector {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
}

.format-type-btn {
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-tertiary);
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: all 0.2s ease;
}

.format-type-btn:hover {
    color: var(--text-primary);
    border-color: var(--text-muted);
}

.format-type-btn.active {
    background: var(--accent-primary);
    color: var(--bg-primary);
    border-color: var(--accent-primary);
}

/* Select Dropdown */
.select-wrapper {
    position: relative;
}

.format-select {
    width: 100%;
    padding: var(--space-md);
    background: var(--bg-tertiary);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    cursor: pointer;
    appearance: none;
    transition: all 0.2s ease;
}

.format-select:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.format-select optgroup {
    background: var(--bg-secondary);
    color: var(--accent-primary);
    font-weight: 600;
    font-size: 0.7rem;
    padding: var(--space-sm) 0;
}

.format-select option {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    padding: var(--space-sm);
}

.select-arrow {
    position: absolute;
    right: var(--space-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
    font-size: 0.75rem;
}

/* Process Button */
.btn-process {
    width: 100%;
    margin-top: var(--space-xl);
    padding: var(--space-lg);
    background: linear-gradient(135deg, var(--accent-primary), #00cc6a);
    border: none;
    border-radius: var(--radius-lg);
    color: var(--bg-primary);
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn-process::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;
}

.btn-process:hover:not(:disabled)::before {
    left: 100%;
}

.btn-process:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 255, 136, 0.3);
}

.btn-process:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background: var(--bg-tertiary);
    color: var(--text-muted);
}

.btn-icon {
    font-size: 1.25rem;
    transition: transform 0.3s ease;
}

.btn-process:hover:not(:disabled) .btn-icon {
    transform: translateX(5px);
}

/* Processing State */
.processing-state {
    text-align: center;
    padding: var(--space-2xl);
    background: var(--bg-secondary);
    border: 1px solid var(--grid-accent);
    border-radius: var(--radius-xl);
}

.processing-animation {
    margin-bottom: var(--space-xl);
}

.wave-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    height: 60px;
}

.processing-wave {
    width: 8px;
    height: 40px;
    background: linear-gradient(to top, var(--accent-primary), var(--accent-secondary));
    border-radius: 4px;
    animation: waveAnimation 1s ease-in-out infinite;
}

.processing-wave:nth-child(1) { animation-delay: 0s; }
.processing-wave:nth-child(2) { animation-delay: 0.1s; }
.processing-wave:nth-child(3) { animation-delay: 0.2s; }
.processing-wave:nth-child(4) { animation-delay: 0.3s; }

@keyframes waveAnimation {
    0%, 100% { transform: scaleY(0.5); }
    50% { transform: scaleY(1.5); }
}

.processing-state h3 {
    font-family: var(--font-display);
    font-size: 1rem;
    letter-spacing: 0.15em;
    margin-bottom: var(--space-sm);
}

.processing-status {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: var(--space-lg);
}

.progress-bar {
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: 2px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 2px;
    transition: width 0.3s ease;
    animation: progressPulse 2s ease-in-out infinite;
}

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

/* Results */
.results {
    background: var(--bg-secondary);
    border: 1px solid var(--accent-primary);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    box-shadow: 0 0 30px var(--accent-glow);
}

.results-title {
    font-family: var(--font-display);
    font-size: 1rem;
    letter-spacing: 0.15em;
    color: var(--accent-primary);
    margin-bottom: var(--space-xl);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.success-icon {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-primary);
    color: var(--bg-primary);
    border-radius: 50%;
    font-weight: bold;
}

.stems-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.stem-card {
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    text-align: center;
    transition: all 0.2s ease;
    cursor: pointer;
}

.stem-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
}

.stem-icon {
    font-size: 2rem;
    margin-bottom: var(--space-sm);
}

.stem-name {
    font-weight: 500;
    text-transform: capitalize;
    margin-bottom: var(--space-xs);
}

.stem-format {
    font-size: 0.7rem;
    color: var(--text-muted);
}

.stem-download {
    display: inline-block;
    margin-top: var(--space-sm);
    padding: var(--space-xs) var(--space-sm);
    background: var(--accent-primary);
    color: var(--bg-primary);
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
}

.stem-download:hover {
    background: var(--accent-secondary);
    transform: scale(1.05);
}

.stem-download:disabled {
    opacity: 0.5;
    cursor: wait;
}

.results-actions {
    display: flex;
    gap: var(--space-md);
}

.btn-download-all,
.btn-new {
    flex: 1;
    padding: var(--space-md);
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    transition: all 0.2s ease;
}

.btn-download-all {
    background: var(--accent-primary);
    color: var(--bg-primary);
}

.btn-download-all:hover {
    background: var(--accent-secondary);
}

.btn-new {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--text-muted);
}

.btn-new:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

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

.footer-content p {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: var(--space-xs);
}

.footer-content strong {
    color: var(--accent-primary);
}

.footer-tagline {
    font-style: italic;
    opacity: 0.7;
}

/* Utilities */
.hidden {
    display: none !important;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: var(--space-md);
    }
    
    .header {
        flex-direction: column;
        gap: var(--space-md);
        text-align: center;
    }
    
    .logo {
        flex-direction: column;
    }
    
    .radio-group {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .results-actions {
        flex-direction: column;
    }
}

/* Animations for page load */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.header { animation: fadeInUp 0.5s ease; }
.drop-zone { animation: fadeInUp 0.5s ease 0.1s backwards; }
.control-panel { animation: fadeInUp 0.5s ease 0.2s backwards; }

/* ═══════════════════════════════════════════════════════════════════════════════
   LICENSE BAR & UPGRADE MODAL
   ═══════════════════════════════════════════════════════════════════════════════ */

.license-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--grid-accent);
    padding: var(--space-sm) var(--space-xl);
}

.license-status {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    font-size: 0.8rem;
}

.license-status.trial .license-icon {
    animation: pulse 2s ease-in-out infinite;
}

.license-status.licensed {
    color: var(--accent-primary);
}

.license-bar.licensed {
    background: linear-gradient(90deg, rgba(0, 255, 136, 0.1), transparent, rgba(0, 255, 136, 0.1));
    border-bottom-color: var(--accent-primary);
}

.license-bar.expired {
    background: rgba(255, 71, 87, 0.1);
    border-bottom-color: var(--error);
}

.license-bar.expired .license-text {
    color: var(--error);
}

.btn-upgrade {
    padding: var(--space-xs) var(--space-md);
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border: none;
    border-radius: var(--radius-sm);
    color: var(--bg-primary);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-upgrade:hover {
    transform: scale(1.05);
    box-shadow: 0 0 15px var(--accent-glow);
}

/* Upgrade Modal */
.upgrade-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.upgrade-modal-content {
    background: var(--bg-secondary);
    border: 2px solid var(--accent-primary);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    max-width: 450px;
    width: 90%;
    text-align: center;
    position: relative;
    box-shadow: 0 0 50px var(--accent-glow);
    animation: scaleIn 0.3s ease;
}

@keyframes scaleIn {
    from { transform: scale(0.9); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.modal-close {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.25rem;
    cursor: pointer;
    transition: color 0.2s;
}

.modal-close:hover {
    color: var(--error);
}

.upgrade-modal h2 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-lg);
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.upgrade-price {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-primary);
    margin-bottom: var(--space-lg);
}

.upgrade-price span {
    font-size: 0.9rem;
    font-weight: 400;
    color: var(--text-secondary);
    display: block;
}

.upgrade-features {
    list-style: none;
    text-align: left;
    margin-bottom: var(--space-xl);
}

.upgrade-features li {
    padding: var(--space-sm) 0;
    color: var(--text-secondary);
}

.upgrade-features li::before {
    color: var(--accent-primary);
    margin-right: var(--space-sm);
}

.btn-checkout {
    width: 100%;
    padding: var(--space-lg);
    background: linear-gradient(135deg, var(--accent-primary), #00cc6a);
    border: none;
    border-radius: var(--radius-md);
    color: var(--bg-primary);
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: var(--space-xl);
}

.btn-checkout:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 255, 136, 0.3);
}

.license-input-section {
    padding-top: var(--space-lg);
    border-top: 1px solid var(--grid-accent);
}

.license-input-section p {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: var(--space-sm);
}

.license-input-row {
    display: flex;
    gap: var(--space-sm);
}

.license-input-row input {
    flex: 1;
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--text-muted);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.license-input-row input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.license-input-row button {
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--accent-primary);
    border-radius: var(--radius-sm);
    color: var(--accent-primary);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.license-input-row button:hover {
    background: var(--accent-primary);
    color: var(--bg-primary);
}

.upgrade-note {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: var(--space-lg);
}

/* Adjust container for license bar */
.container {
    padding-top: calc(var(--space-xl) + 40px);
}