:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --text-color: #f8fafc;
    --text-muted: #cbd5e1;
    --error-color: #ef4444;
    --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    --glass-bg: rgba(30, 41, 59, 0.7);
    --border-color: rgba(255, 255, 255, 0.1);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    background-image:
        radial-gradient(circle at 10% 20%, rgba(59, 130, 246, 0.1) 0%, transparent 20%),
        radial-gradient(circle at 90% 80%, rgba(139, 92, 246, 0.1) 0%, transparent 20%);
}

.app-container {
    width: 100%;
    max-width: 1200px;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 4rem;
    animation: fadeInDown 0.8s ease-out;
}

h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.02em;
}

.subtitle {
    color: var(--text-muted);
    font-size: 1.2rem;
}

.input-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 4rem;
    animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

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

label {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-color);
}

input[type="number"] {
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem 1.5rem;
    font-size: 1.5rem;
    color: var(--text-color);
    width: 200px;
    text-align: center;
    transition: all 0.3s ease;
}

input[type="number"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.2);
}

.hint {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.error-message {
    color: var(--error-color);
    font-size: 0.95rem;
    font-weight: 500;
    margin-top: 0.5rem;
    animation: fadeInDown 0.3s ease-out;
}

.primary-btn {
    background: var(--accent-gradient);
    color: white;
    border: none;
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

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

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    animation: fadeInUp 0.8s ease-out 0.4s backwards;
}

.movement-card {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    transition: transform 0.3s, border-color 0.3s;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.movement-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
}

.movement-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--accent-gradient);
    opacity: 0;
    transition: opacity 0.3s;
}

.movement-card:hover::before {
    opacity: 1;
}

.movement-card::after {
    content: 'Click for Details →';
    display: block;
    margin-top: 1.5rem;
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.9rem;
    opacity: 0.7;
    transition: opacity 0.2s, transform 0.2s;
}

.movement-card:hover::after {
    opacity: 1;
    transform: translateX(5px);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.card-title {
    font-size: 1.5rem;
    font-weight: 600;
}

.card-badge {
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary-color);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
}

.card-description {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

.card-features {
    list-style: none;
}

.card-features li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.card-features li::before {
    content: '•';
    color: var(--primary-color);
    font-weight: bold;
}

.hidden {
    display: none !important;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(5px);
}

.modal-content {
    background: var(--card-bg);
    width: 90%;
    max-width: 800px;
    max-height: 90vh;
    border-radius: 20px;
    padding: 2rem;
    position: relative;
    overflow-y: auto;
    border: 1px solid var(--border-color);
}

.close-modal {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-muted);
    transition: color 0.2s;
}

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

#modal-title {
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.movement-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

.movement-table th,
.movement-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.movement-table th {
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
}

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

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

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

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