/* Premium Coffee Theme Design System */
        :root {
            /* Coffee-Inspired Palette */
            --coffee-dark: #3c2415;
            --coffee-medium: #8b4513;
            --coffee-light: #d2691e;
            --cream: #f5deb3;
            --foam: #fff8dc;
            --espresso: #1a0f0a;

            /* Semantic Colors */
            --primary: var(--coffee-medium);
            --primary-light: var(--coffee-light);
            --secondary: #10b981;
            --warning: #f59e0b;
            --danger: #ef4444;
            --success: #10b981;

            /* Surface Colors */
            --bg-primary: #fefcfb;
            --bg-secondary: var(--foam);
            --surface-elevated: #ffffff;
            --surface-coffee: rgba(139, 69, 19, 0.05);

            /* Typography */
            --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

            /* Spacing */
            --space-xs: 0.25rem;
            --space-sm: 0.5rem;
            --space-md: 1rem;
            --space-lg: 1.5rem;
            --space-xl: 2rem;
            --space-2xl: 3rem;
            --space-3xl: 4rem;

            /* Radius */
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 24px;
            --radius-full: 9999px;

            /* Shadows */
            --shadow-sm: 0 1px 2px 0 rgba(60, 36, 21, 0.05);
            --shadow-md: 0 4px 6px -1px rgba(60, 36, 21, 0.1), 0 2px 4px -1px rgba(60, 36, 21, 0.06);
            --shadow-lg: 0 10px 15px -3px rgba(60, 36, 21, 0.1), 0 4px 6px -2px rgba(60, 36, 21, 0.05);
            --shadow-xl: 0 20px 25px -5px rgba(60, 36, 21, 0.1), 0 10px 10px -5px rgba(60, 36, 21, 0.04);
            --shadow-coffee: 0 8px 32px rgba(139, 69, 19, 0.15);

            /* Transitions */
            --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
            --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
            --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        body {
            font-family: var(--font-primary);
            background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
            color: var(--coffee-dark);
            line-height: 1.6;
            min-height: 100vh;
        }

        /* Coffee Bean Animated Background */
        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="20" cy="20" r="1" fill="rgba(139,69,19,0.1)"/><circle cx="80" cy="60" r="1.5" fill="rgba(139,69,19,0.08)"/><circle cx="60" cy="90" r="1" fill="rgba(139,69,19,0.1)"/></svg>');
            background-size: 200px 200px;
            animation: float 20s ease-in-out infinite;
            pointer-events: none;
            z-index: -1;
        }

        @keyframes float {

            0%,
            100% {
                transform: translateY(0px) rotate(0deg);
            }

            50% {
                transform: translateY(-20px) rotate(180deg);
            }
        }

        /* Premium Header */
        .hero {
            background: linear-gradient(135deg, var(--coffee-dark) 0%, var(--coffee-medium) 50%, var(--coffee-light) 100%);
            color: white;
            padding: var(--space-3xl) var(--space-xl);
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .hero::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 60 60"><g fill="rgba(255,255,255,0.1)"><circle cx="30" cy="30" r="1.5"/></g></svg>');
            background-size: 60px 60px;
            animation: steam 15s linear infinite;
            pointer-events: none;
        }

        @keyframes steam {
            0% {
                transform: translateY(0);
                opacity: 1;
            }

            100% {
                transform: translateY(-60px);
                opacity: 0;
            }
        }

        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
            margin: 0 auto;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: var(--space-sm);
            background: rgba(255, 255, 255, 0.15);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.2);
            padding: var(--space-sm) var(--space-md);
            border-radius: var(--radius-full);
            font-size: 0.875rem;
            font-weight: 500;
            margin-bottom: var(--space-xl);
            animation: fadeInUp 0.6s ease-out;
        }

        .hero-title {
            font-size: clamp(2rem, 5vw, 3rem);
            font-weight: 800;
            margin: 0 0 var(--space-lg) 0;
            text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
            animation: fadeInUp 0.6s ease-out 0.2s both;
        }

        .hero-subtitle {
            font-size: clamp(1rem, 2vw, 1.25rem);
            opacity: 0.9;
            margin: 0;
            animation: fadeInUp 0.6s ease-out 0.4s both;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: var(--space-2xl) var(--space-xl);
        }

        /* Premium Calculator Layout */
        .calculator-layout {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--space-2xl);
            margin-top: var(--space-2xl);
        }

        @media (max-width: 768px) {
            .calculator-layout {
                grid-template-columns: 1fr;
                gap: var(--space-xl);
            }
        }

        .calculator-panel {
            background: var(--surface-elevated);
            border-radius: var(--radius-xl);
            padding: var(--space-2xl);
            box-shadow: var(--shadow-coffee);
            border: 1px solid rgba(139, 69, 19, 0.1);
            position: relative;
            overflow: hidden;
        }

        .calculator-panel::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--primary-light));
        }

        .panel-title {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--coffee-dark);
            margin: 0 0 var(--space-lg) 0;
            display: flex;
            align-items: center;
            gap: var(--space-sm);
        }

        /* Premium Form Controls */
        .form-section {
            margin-bottom: var(--space-xl);
        }

        .section-title {
            font-size: 1.125rem;
            font-weight: 600;
            color: var(--coffee-medium);
            margin: 0 0 var(--space-md) 0;
            display: flex;
            align-items: center;
            gap: var(--space-sm);
        }

        .preset-drinks {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
            gap: var(--space-sm);
            margin-bottom: var(--space-lg);
        }

        .drink-preset {
            background: var(--surface-coffee);
            border: 2px solid transparent;
            border-radius: var(--radius-md);
            padding: var(--space-md);
            text-align: center;
            cursor: pointer;
            transition: var(--transition-base);
            position: relative;
        }

        .drink-preset:hover {
            border-color: var(--primary);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        .drink-preset.active {
            border-color: var(--primary);
            background: rgba(139, 69, 19, 0.1);
        }

        .drink-icon {
            font-size: 1.5rem;
            margin-bottom: var(--space-xs);
        }

        .drink-name {
            font-weight: 600;
            font-size: 0.875rem;
            color: var(--coffee-dark);
            margin-bottom: var(--space-xs);
        }

        .drink-caffeine {
            font-size: 0.75rem;
            color: var(--coffee-medium);
        }

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

        .input-label {
            display: block;
            font-weight: 500;
            color: var(--coffee-dark);
            margin-bottom: var(--space-sm);
            font-size: 0.875rem;
        }

        .input-field {
			color: black;
            width: 100%;
            padding: var(--space-md);
            border: 2px solid rgba(139, 69, 19, 0.1);
            border-radius: var(--radius-md);
            font-size: 1rem;
            transition: var(--transition-base);
            background: var(--bg-primary);
        }

        .input-field:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(139, 69, 19, 0.1);
        }

        .input-help {
            font-size: 0.75rem;
            color: var(--coffee-medium);
            margin-top: var(--space-xs);
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            color: white;
            border: none;
            padding: var(--space-md) var(--space-xl);
            border-radius: var(--radius-full);
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: var(--transition-base);
            box-shadow: var(--shadow-md);
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: var(--space-sm);
        }

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

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

        /* Premium Results Display */
        .results-panel {
            display: none;
        }

        .results-panel.active {
            display: block;
            animation: fadeInUp 0.6s ease-out;
        }

        .live-status {
            background: linear-gradient(135deg, var(--surface-coffee), rgba(16, 185, 129, 0.1));
            border-radius: var(--radius-lg);
            padding: var(--space-lg);
            margin-bottom: var(--space-xl);
            border: 1px solid rgba(16, 185, 129, 0.2);
        }

        .status-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: var(--space-md);
        }

        .current-level {
            font-size: 2rem;
            font-weight: 800;
            color: var(--primary);
        }

        .level-change {
            font-size: 0.875rem;
            color: var(--success);
            display: flex;
            align-items: center;
            gap: var(--space-xs);
        }

        .timeline-container {
            background: var(--surface-elevated);
            border-radius: var(--radius-lg);
            padding: var(--space-lg);
            margin-bottom: var(--space-xl);
            box-shadow: var(--shadow-sm);
        }

        .timeline-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: var(--space-lg);
        }

        .timeline-title {
            font-size: 1.125rem;
            font-weight: 600;
            color: var(--coffee-dark);
        }

        .chart-container {
            position: relative;
            height: 300px;
            margin: var(--space-lg) 0;
        }

        .milestones {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: var(--space-md);
            margin-top: var(--space-xl);
        }

        .milestone {
            background: var(--bg-secondary);
            border-radius: var(--radius-md);
            padding: var(--space-lg);
            text-align: center;
            border: 1px solid rgba(139, 69, 19, 0.1);
        }

        .milestone-time {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: var(--space-xs);
        }

        .milestone-label {
            font-size: 0.875rem;
            color: var(--coffee-medium);
            margin-bottom: var(--space-sm);
        }

        .milestone-desc {
            font-size: 0.75rem;
            color: var(--coffee-dark);
            opacity: 0.8;
        }

        /* Animations */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }

            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        @keyframes pulse {

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

            50% {
                transform: scale(1.05);
            }
        }

        .pulse {
            animation: pulse 2s ease-in-out infinite;
        }

        /* Real-time Updates */
        .live-indicator {
            display: inline-flex;
            align-items: center;
            gap: var(--space-xs);
            background: var(--success);
            color: white;
            padding: var(--space-xs) var(--space-sm);
            border-radius: var(--radius-full);
            font-size: 0.75rem;
            font-weight: 500;
        }

        .live-dot {
            width: 6px;
            height: 6px;
            background: white;
            border-radius: 50%;
            animation: pulse 1s ease-in-out infinite;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .hero {
                padding: var(--space-2xl) var(--space-md);
            }

            .container {
                padding: var(--space-xl) var(--space-md);
            }

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

            .milestones {
                grid-template-columns: 1fr;
            }
        }