:root {
    --bg-deep: #09090b;
    --bg-card: #121214;
    --border: #27272a;
    --accent-blue: #3b82f6;
    --accent-purple: #a855f7;
    --text-primary: #f4f4f5;
    --text-secondary: #a1a1aa;
    --danger: #ef4444;
    --success: #22c55e;
    --gradient: linear-gradient(135deg, #3b82f6 0%, #a855f7 100%);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-deep);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.container {
    width: 100%;
    max-width: 1024px;
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 2rem;
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 2.5rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5), 0 0 40px rgba(168, 85, 247, 0.1);
    position: relative;
}

@media (max-width: 900px) {
    .container {
        grid-template-columns: 1fr;
        padding: 1.5rem;
    }
}

.container::before {
    content: '';
    position: absolute;
    top: -1px; left: -1px; right: -1px; height: 1px;
    background: var(--gradient);
    border-radius: 24px 24px 0 0;
    opacity: 0.5;
}

header {
    grid-column: 1 / -1;
    margin-bottom: 0.5rem;
}

h1 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    margin-bottom: 0.5rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

p.subtitle {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.form-section {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

input {
    background-color: #1c1c1f;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0.75rem 1rem;
    color: white;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s;
    width: 100%;
}

input:focus {
    border-color: var(--accent-purple) !important;
}

button {
    background: var(--gradient);
    border: none;
    border-radius: 12px;
    padding: 1rem;
    color: white;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    box-shadow: 0 4px 14px 0 rgba(168, 85, 247, 0.39);
    transition: opacity 0.2s;
}

button:hover {
    opacity: 0.9;
}

.btn-secondary {
    background: #1c1c1f;
    border: 1px solid var(--border);
    box-shadow: none;
    color: var(--text-primary);
    font-size: 0.875rem;
    padding: 0.75rem;
}

.btn-secondary:hover {
    border-color: var(--text-secondary);
}

.btn-success {
    background: rgba(34, 197, 94, 0.1) !important;
    border-color: var(--success) !important;
    color: var(--success) !important;
}

.results-section {
    background-color: #1c1c1f;
    border-radius: 20px;
    border: 1px dashed var(--border);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 480px;
}

.empty-state {
    text-align: center;
    color: var(--text-secondary);
}

.result-card {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.stat-box {
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.75rem;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.total-box {
    background: rgba(168, 85, 247, 0.1);
    border-radius: 16px;
    padding: 1.5rem;
    border: 1px solid rgba(168, 85, 247, 0.2);
    text-align: center;
}

.total-label {
    font-weight: 600;
    color: var(--accent-purple);
    margin-bottom: 0.5rem;
    font-size: 0.75rem;
}

.total-value {
    font-size: 2.5rem;
    font-weight: 800;
    color: white;
}

.warning-box {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: #fca5a5;
    padding: 1rem;
    border-radius: 12px;
    font-size: 0.875rem;
    line-height: 1.4;
}

.footer-note {
    position: absolute;
    bottom: -1.5rem;
    right: 1.5rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
    opacity: 0.5;
}