/* ============================================
   MODERN DESIGN SYSTEM - 2024 TRENDS
   Glassmorphism, Neumorphism, Smooth Animations
   ============================================ */

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

:root {
    /* Modern Color Palette - 2024 Trends */
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --primary-light: #818cf8;
    --primary-dark: #4338ca;
    
    --secondary: #8b5cf6;
    --secondary-hover: #7c3aed;
    
    --accent: #ec4899;
    --accent-hover: #db2777;
    
    --success: #10b981;
    --success-hover: #059669;
    --warning: #f59e0b;
    --warning-hover: #d97706;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --info: #3b82f6;
    --info-hover: #2563eb;
    
    /* Background Colors - Modern Gradients */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-glass: rgba(255, 255, 255, 0.05);
    --bg-glass-strong: rgba(255, 255, 255, 0.1);
    --bg-glass-hover: rgba(255, 255, 255, 0.15);
    
    /* Text Colors */
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    --text-inverse: #0f172a;
    
    /* Border Colors */
    --border-primary: rgba(255, 255, 255, 0.1);
    --border-secondary: rgba(255, 255, 255, 0.2);
    --border-light: rgba(255, 255, 255, 0.05);
    --border-strong: rgba(255, 255, 255, 0.3);
    
    /* Shadows - Modern & Soft */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 2px 4px 0 rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);
    --shadow-glow-strong: 0 0 40px rgba(99, 102, 241, 0.5);
    
    /* Border Radius - Modern & Rounded */
    --radius-xs: 6px;
    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --radius-2xl: 40px;
    --radius-full: 9999px;
    
    /* Spacing Scale */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    
    /* Typography */
    --font-xs: 0.75rem;
    --font-sm: 0.875rem;
    --font-base: 1rem;
    --font-lg: 1.125rem;
    --font-xl: 1.25rem;
    --font-2xl: 1.5rem;
    --font-3xl: 1.875rem;
    --font-4xl: 2.25rem;
    
    /* Transitions - Smooth & Modern */
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* ============================================
   BODY & BASE STYLES
   ============================================ */

body {
    font-family: 'Inter', 'Poppins', 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    background-image: 
        radial-gradient(ellipse 80% 50% at 0% 0%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse 80% 50% at 100% 100%, rgba(139, 92, 246, 0.15) 0%, transparent 50%),
        linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    color: var(--text-primary);
    min-height: 100vh;
    padding: var(--space-md);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-size: 14px;
    scroll-behavior: smooth;
    position: relative;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

.app-container {
    max-width: 1600px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

/* ============================================
   HEADER - Modern Glassmorphism
   ============================================ */

.app-header {
    background: var(--bg-glass-strong);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-lg) var(--space-xl);
    margin-bottom: var(--space-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    animation: slideDown 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    overflow: hidden;
}

.app-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 50%, var(--accent) 100%);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.app-header::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.1) 0%, transparent 70%);
    animation: rotate 20s linear infinite;
    pointer-events: none;
}

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

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.header-content h1 {
    font-size: var(--font-2xl);
    font-weight: 800;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 2px;
    letter-spacing: -0.02em;
}

.header-content .subtitle {
    font-size: var(--font-xs);
    color: var(--text-tertiary);
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

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

.status-indicator {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    background: var(--bg-glass);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-full);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--text-tertiary);
    transition: var(--transition);
    box-shadow: 0 0 10px rgba(148, 163, 184, 0.5);
}

.status-dot.connected {
    background: var(--success);
    box-shadow: 0 0 15px rgba(16, 185, 129, 0.6);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.8;
        transform: scale(1.1);
    }
}

#statusText {
    font-size: var(--font-sm);
    font-weight: 600;
    color: var(--text-secondary);
}

/* ============================================
   CONNECTION PANEL - Glassmorphism Card
   ============================================ */

.connection-panel {
    background: var(--bg-glass-strong);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    margin-bottom: var(--space-md);
    box-shadow: var(--shadow-lg);
    animation: fadeInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) 0.1s both;
}

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

.panel-header {
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--border-primary);
    position: relative;
}

.panel-header h2 {
    font-size: var(--font-xl);
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.connection-controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

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

.control-group label {
    font-size: var(--font-xs);
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.control-group select,
.control-group input {
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-glass);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: var(--font-sm);
    font-family: inherit;
    transition: var(--transition);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.control-group select:focus,
.control-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1), var(--shadow-glow);
    background: var(--bg-glass-hover);
}

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

.button-group {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

/* ============================================
   BUTTONS - Modern Gradient & Glass
   ============================================ */

.btn {
    padding: var(--space-sm) var(--space-lg);
    border: none;
    border-radius: var(--radius-sm);
    font-size: var(--font-sm);
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    text-decoration: none;
    position: relative;
    overflow: hidden;
    letter-spacing: 0.01em;
}

.btn::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;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--text-inverse);
    box-shadow: var(--shadow-md), var(--shadow-glow);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow-strong);
    background: linear-gradient(135deg, var(--primary-hover) 0%, var(--primary-dark) 100%);
}

.btn-secondary {
    background: var(--bg-glass-strong);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: var(--text-primary);
    border: 1px solid var(--border-primary);
    box-shadow: var(--shadow-md);
}

.btn-secondary:hover {
    background: var(--bg-glass-hover);
    border-color: var(--border-secondary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-success {
    background: linear-gradient(135deg, var(--success) 0%, var(--success-hover) 100%);
    color: var(--text-inverse);
    box-shadow: var(--shadow-md);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    filter: brightness(1.1);
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger) 0%, var(--danger-hover) 100%);
    color: var(--text-inverse);
    box-shadow: var(--shadow-md);
}

.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    filter: brightness(1.1);
}

.btn-warning {
    background: linear-gradient(135deg, var(--warning) 0%, var(--warning-hover) 100%);
    color: var(--text-inverse);
    box-shadow: var(--shadow-md);
}

.btn-warning:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    filter: brightness(1.1);
}

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

/* ============================================
   ACTION CARDS - Glassmorphism
   ============================================ */

.action-card {
    background: var(--bg-glass-strong);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    height: 100%;
    position: relative;
    overflow: hidden;
    animation: fadeInScale 0.6s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.action-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.action-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-2xl), var(--shadow-glow);
    border-color: var(--border-secondary);
    background: var(--bg-glass-hover);
}

.action-card:hover::before {
    transform: scaleX(1);
}

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.action-header {
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--border-primary);
    position: relative;
}

.action-header h3 {
    font-size: var(--font-lg);
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

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

.buttons-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-sm);
}

@media (max-width: 768px) {
    .buttons-grid {
        grid-template-columns: 1fr;
    }
}

.action-result {
    margin-top: var(--space-lg);
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    font-size: var(--font-sm);
    line-height: 1.6;
    display: none;
    background: var(--bg-glass);
    border: 1px solid var(--border-primary);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    position: relative;
    z-index: 1;
}

.action-result.info {
    display: block !important;
    border-color: var(--info);
    color: var(--info);
    background: rgba(59, 130, 246, 0.1);
}

.action-result.success {
    display: block;
    border-color: var(--success);
    color: var(--success);
    background: rgba(16, 185, 129, 0.1);
}

.action-result.error {
    display: block;
    border-color: var(--danger);
    color: var(--danger);
    background: rgba(239, 68, 68, 0.1);
}

/* ============================================
   DEVICE INFO GRID - Modern Cards
   ============================================ */

.device-info-grid {
    display: none !important;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: var(--space-md);
    position: relative;
    z-index: 1;
    width: 100%;
    animation: fadeInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.device-info-grid[style*="grid"] {
    display: grid !important;
}

.result-item {
    background: var(--bg-glass-strong);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
    transition: var(--transition);
    box-shadow: var(--shadow-md);
    min-height: 60px;
    position: relative;
    overflow: hidden;
    animation: fadeInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.result-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--primary-light) 100%);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.result-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
    border-color: var(--border-secondary);
    background: var(--bg-glass-hover);
}

.result-item:hover::before {
    transform: scaleX(1);
}

.result-item-header {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: var(--space-sm);
    width: 100%;
}

.result-item-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.2) 0%, rgba(139, 92, 246, 0.2) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-lg);
    color: var(--primary-light);
    transition: var(--transition);
    flex-shrink: 0;
    border: 1px solid var(--border-primary);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.result-item:hover .result-item-icon {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--text-inverse);
    transform: scale(1.1) rotate(5deg);
    box-shadow: var(--shadow-glow);
    border-color: transparent;
}

.result-item-header .result-label {
    flex: 1;
}

.result-item-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    flex: 1;
    min-width: 0;
    align-items: flex-start;
    width: 100%;
}

.result-label {
    font-size: 10px;
    font-weight: 700;
    color: #ffffff;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    line-height: 1.2;
    text-align: left;
}

.result-value {
    font-size: var(--font-sm);
    font-weight: 600;
    color: var(--success);
    word-break: break-word;
    line-height: 1.3;
    letter-spacing: -0.01em;
    width: 100%;
    text-align: left;
    margin-top: var(--space-xs);
}

/* ============================================
   SECTIONS & TITLES
   ============================================ */

.action-section {
    margin-bottom: var(--space-xl);
    animation: fadeInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.section-title {
    font-size: var(--font-xl);
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
    letter-spacing: -0.02em;
    position: relative;
    padding-left: var(--space-md);
}

.section-title::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 24px;
    background: linear-gradient(180deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: var(--radius-full);
}

.actions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--space-md);
}

/* ============================================
   DEVICE INFO LOADER - Modern Animation
   ============================================ */

.device-info-loader {
    padding: var(--space-3xl);
    text-align: center;
    min-height: 500px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-2xl);
    background: var(--bg-glass);
    border-radius: var(--radius-xl);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.cash-register-animation {
    width: 480px;
    height: 360px;
    position: relative;
    margin: 0 auto;
    filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.3));
}

.register-body {
    width: 100%;
    height: 240px;
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    border-radius: var(--radius-xl) var(--radius-xl) var(--radius-md) var(--radius-md);
    position: relative;
    box-shadow: 
        0 20px 60px rgba(0, 0, 0, 0.5),
        inset 0 2px 8px rgba(255, 255, 255, 0.1);
    animation: registerPulse 2s ease-in-out infinite;
    border: 2px solid rgba(255, 255, 255, 0.1);
}

.register-screen {
    width: 75%;
    height: 90px;
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    border-radius: var(--radius-md);
    position: absolute;
    top: 44px;
    left: 12.5%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-inverse);
    font-size: var(--font-md);
    font-weight: 800;
    font-family: 'Courier New', monospace;
    animation: screenText 1.2s ease-in-out infinite;
    box-shadow: 
        inset 0 2px 8px rgba(0, 0, 0, 0.3),
        0 0 30px rgba(16, 185, 129, 0.6);
    border: 3px solid rgba(255, 255, 255, 0.2);
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.8);
    letter-spacing: 3px;
}

.register-screen::before {
    content: 'READING...';
    animation: screenText 1.2s ease-in-out infinite;
}

.register-buttons {
    position: absolute;
    bottom: 27px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: var(--space-md);
}

.register-button {
    width: 24px;
    height: 24px;
    background: var(--primary);
    border-radius: 50%;
    animation: buttonBlink 1.2s ease-in-out infinite;
    box-shadow: 0 0 20px rgba(99, 102, 241, 0.8);
    border: 2px solid rgba(255, 255, 255, 0.4);
}

.register-button:nth-child(2) {
    animation-delay: 0.4s;
}

.register-button:nth-child(3) {
    animation-delay: 0.8s;
}

@keyframes registerPulse {
    0%, 100% {
        transform: scale(1);
        box-shadow: 
            0 20px 60px rgba(0, 0, 0, 0.5),
            inset 0 2px 8px rgba(255, 255, 255, 0.1);
    }
    50% {
        transform: scale(1.02);
        box-shadow: 
            0 25px 70px rgba(0, 0, 0, 0.6),
            inset 0 2px 8px rgba(255, 255, 255, 0.15);
    }
}

@keyframes screenText {
    0%, 100% {
        opacity: 0.6;
    }
    50% {
        opacity: 1;
    }
}

@keyframes buttonBlink {
    0%, 100% {
        opacity: 0.6;
        transform: scale(1);
    }
    50% {
        opacity: 1;
        transform: scale(1.15);
    }
}

/* Receipt Printer Animation */
.receipt-printer {
    position: absolute;
    bottom: -24px;
    left: 50%;
    transform: translateX(-50%);
    width: 75%;
    max-width: 400px;
    height: 480px;
    overflow: hidden;
    z-index: 10;
    mask-image: linear-gradient(to bottom, transparent 0%, black 10%, black 90%, transparent 100%);
    -webkit-mask-image: linear-gradient(to bottom, transparent 0%, black 10%, black 90%, transparent 100%);
}

.receipt-paper {
    background: var(--bg-secondary);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    padding: var(--space-lg) var(--space-md);
    box-shadow: 
        0 8px 20px rgba(0, 0, 0, 0.3),
        0 2px 8px rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-primary);
    border-bottom: 2px dashed var(--border-primary);
    position: relative;
    width: 100%;
    animation: receiptScrollUp 18s linear infinite;
    transform-origin: top center;
    min-height: 360px;
}

.receipt-paper::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: repeating-linear-gradient(
        90deg,
        transparent,
        transparent 8px,
        var(--border-primary) 8px,
        var(--border-primary) 10px
    );
}

.receipt-paper::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: repeating-linear-gradient(
        90deg,
        transparent,
        transparent 8px,
        var(--border-primary) 8px,
        var(--border-primary) 10px
    );
}

.receipt-content {
    position: relative;
    width: 100%;
}

.receipt-line {
    font-family: 'Courier New', monospace;
    font-size: 16px;
    color: var(--text-primary);
    line-height: 1.6;
    white-space: nowrap;
    overflow: hidden;
    text-align: center;
    font-weight: 600;
    margin: 3px 0;
    text-overflow: ellipsis;
}

.receipt-line.receipt-title {
    font-weight: 800;
    font-size: 20px;
    margin: 4px 0;
}

@keyframes receiptScrollUp {
    0% {
        transform: translateY(100%);
    }
    100% {
        transform: translateY(-100%);
    }
}

#deviceInfoLoaderText {
    font-size: var(--font-sm);
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.02em;
    margin-top: var(--space-md);
}

/* ============================================
   VAT RATES DISPLAY
   ============================================ */

.vat-rates-value {
    font-size: var(--font-sm) !important;
    line-height: 1.4 !important;
    font-weight: 600 !important;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2px var(--space-sm);
    text-align: left !important;
    width: 100%;
    margin-top: var(--space-xs);
    align-items: start;
    justify-items: start;
}

.vat-rate-line {
    padding: 0;
    line-height: 1.4;
    font-size: var(--font-sm);
    font-weight: 600;
    color: var(--success);
    white-space: nowrap;
}

/* ============================================
   MODAL - Modern Glassmorphism
   ============================================ */

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    animation: fadeIn 0.3s ease;
}

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

.modal-container {
    background: var(--bg-glass-strong);
    backdrop-filter: blur(30px) saturate(180%);
    -webkit-backdrop-filter: blur(30px) saturate(180%);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-2xl);
    padding: var(--space-2xl);
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-2xl), var(--shadow-glow-strong);
    animation: modalSlideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
}

@keyframes modalSlideUp {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--border-primary);
}

.modal-header h2 {
    font-size: var(--font-2xl);
    font-weight: 700;
    color: var(--text-primary);
}

.modal-close {
    width: 36px;
    height: 36px;
    border: none;
    background: var(--bg-glass);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-full);
    color: var(--text-primary);
    font-size: var(--font-xl);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    background: var(--bg-glass-hover);
    transform: rotate(90deg);
    border-color: var(--danger);
    color: var(--danger);
}

.modal-body {
    margin-bottom: var(--space-xl);
}

.form-group {
    margin-bottom: var(--space-lg);
}

.datetime-display {
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    font-size: 1rem;
    min-height: 48px;
    display: flex;
    align-items: center;
    transition: all 0.3s ease;
}

.datetime-display:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--border-secondary);
}

.form-label {
    display: block;
    font-size: var(--font-xs);
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
}

.form-col {
    display: flex;
    flex-direction: column;
}

.form-input {
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-glass);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: var(--font-sm);
    font-family: inherit;
    transition: var(--transition);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1), var(--shadow-glow);
    background: var(--bg-glass-hover);
}

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

.radio-option {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-lg);
    background: var(--bg-glass);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
}

.radio-option:hover {
    background: var(--bg-glass-hover);
    border-color: var(--border-secondary);
}

.radio-option input[type="radio"] {
    width: 20px;
    height: 20px;
    accent-color: var(--primary);
}

.radio-label {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.radio-title {
    font-weight: 600;
    color: var(--text-primary);
}

.radio-desc {
    font-size: var(--font-sm);
    color: var(--text-tertiary);
}

.required {
    color: var(--danger);
}

.quick-date-buttons {
    display: flex;
    gap: var(--space-md);
    margin-top: var(--space-md);
}

.btn-quick-date {
    padding: var(--space-sm) var(--space-lg);
    background: var(--bg-glass);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: var(--font-sm);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-quick-date:hover {
    background: var(--bg-glass-hover);
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
}

.form-hint {
    font-size: var(--font-xs);
    color: var(--text-tertiary);
    margin-top: var(--space-sm);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-md);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--border-primary);
}

/* ============================================
   LOADING OVERLAY
   ============================================ */

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.loading-overlay.show {
    opacity: 1;
}

.loader-container {
    text-align: center;
    color: var(--text-primary);
}

.loader {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(99, 102, 241, 0.2);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--space-lg);
    box-shadow: var(--shadow-glow);
}

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

.loader-text {
    font-size: var(--font-lg);
    font-weight: 600;
    color: var(--text-primary);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 1024px) {
    .actions-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
    
    .device-info-grid {
        grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    }
}

@media (max-width: 768px) {
    body {
        padding: var(--space-md);
    }
    
    .app-header {
        flex-direction: column;
        gap: var(--space-lg);
        text-align: center;
        padding: var(--space-lg);
    }
    
    .connection-controls {
        grid-template-columns: 1fr;
    }
    
    .actions-grid {
        grid-template-columns: 1fr;
    }
    
    .device-info-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .modal-container {
        width: 95%;
        padding: var(--space-lg);
    }
}

@media (max-width: 480px) {
    .section-title {
        font-size: var(--font-2xl);
    }
    
    .action-card {
        padding: var(--space-lg);
    }
    
    .cash-register-animation {
        width: 240px;
        height: 180px;
    }
}

/* ============================================
   ANIMATIONS - Stagger Effect
   ============================================ */

.result-item[data-animate] {
    animation-delay: calc(var(--index, 0) * 0.05s);
}

@keyframes cardReveal {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* ============================================
   SCROLLBAR STYLING
   ============================================ */

::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: var(--radius-full);
    border: 2px solid var(--bg-secondary);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-hover);
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

.text-gradient {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.glass-effect {
    background: var(--bg-glass-strong);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--border-primary);
}