:root {
    /* Premium Color Palette - Dark Mode */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-primary: #38bdf8; /* Sky Blue */
    --accent-secondary: #818cf8; /* Indigo */
    --accent-danger: #f87171;
    --accent-success: #4ade80;
    --gradient-main: linear-gradient(135deg, #38bdf8 0%, #818cf8 100%);
    
    /* Typography */
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Effects */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-glow: 0 0 20px rgba(56, 189, 248, 0.15);
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    font-weight: 700;
    color: var(--text-primary);
}

h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-align: center;
}

p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

/* Layout */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

main {
    flex: 1;
    padding: var(--spacing-xl) 0;
}

/* Card Component */
.card {
    background-color: var(--bg-secondary);
    border-radius: 1rem;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

/* Calculator Grid */
.calculator-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

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

/* Inputs */
.input-group {
    margin-bottom: var(--spacing-md);
}

.input-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
}

.input-group input {
    width: 100%;
    padding: 0.75rem 1rem;
    background-color: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 0.5rem;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 1rem;
    transition: all 0.2s ease;
}

.input-group input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.2);
}

/* Ticker Display */
.ticker-display {
    text-align: center;
    padding: var(--spacing-xl) 0;
    background: radial-gradient(circle at center, rgba(56, 189, 248, 0.1) 0%, transparent 70%);
    border-radius: 1rem;
    margin-bottom: var(--spacing-lg);
}

.ticker-value {
    font-size: 4rem;
    font-weight: 800;
    font-variant-numeric: tabular-nums;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    text-shadow: 0 0 20px rgba(56, 189, 248, 0.3);
}

.ticker-label {
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
}

/* Controls */
.controls {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-top: var(--spacing-md);
}

.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    font-family: var(--font-sans);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: var(--gradient-main);
    color: white;
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    filter: brightness(1.1);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.btn-danger {
    background-color: rgba(248, 113, 113, 0.1);
    color: var(--accent-danger);
    border: 1px solid rgba(248, 113, 113, 0.2);
}

.btn-danger:hover {
    background-color: rgba(248, 113, 113, 0.2);
}

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

.live-indicator {
    display: inline-block;
    width: 8px;
    height: 8px;
    background-color: var(--accent-danger);
    border-radius: 50%;
    margin-right: 8px;
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* Footer */
footer {
    padding: var(--spacing-lg) 0;
    text-align: center;
    color: var(--text-secondary);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    margin-top: auto;
}