:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --bg-main: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius: 12px;
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.6;
    display: flex;
    justify-content: center;
    padding: 40px 20px;
    min-height: 100vh;
}

.main-wrapper {
    width: 100%;
    max-width: 800px;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

.main-logo {
    max-width: 180px;
    height: auto;
    margin-bottom: 20px;
    border-radius: 8px;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 8px;
    letter-spacing: -0.025em;
}

header p {
    font-size: 1.125rem;
    color: var(--text-muted);
}

.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    border: 1px solid var(--border);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.shadow {
    box-shadow: var(--shadow);
}

.large {
    padding: 32px;
}

.blue-border {
    border-left: 8px solid var(--primary);
}

.form-row {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 24px;
}

.input-group {
    flex: 1;
    min-width: 280px;
}

.input-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.input-group select,
.input-group input {
    width: 100%;
    height: 52px;
    padding: 0 16px;
    border-radius: 10px;
    border: 2px solid var(--border);
    font-size: 1rem;
    color: var(--text-main);
    background-color: #f1f5f9;
    outline: none;
    transition: border-color 0.2s;
}

.input-group select:focus,
.input-group input:focus {
    border-color: var(--primary);
}

.premium-btn {
    width: 100%;
    height: 56px;
    background-color: var(--primary);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    font-size: 1.125rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    transition: background-color 0.2s, transform 0.1s;
    box-shadow: 0 4px 6px -1px rgba(37, 99, 235, 0.3);
}

.premium-btn:hover {
    background-color: var(--primary-hover);
}

.premium-btn:active {
    transform: scale(0.98);
}

.results-container {
    margin-top: 40px;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.results-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
}

.text-btn {
    background: none;
    border: none;
    color: #ef4444;
    font-weight: 600;
    cursor: pointer;
    font-size: 0.875rem;
}

.result-card {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.detail-item {
    border-bottom: 1px solid #f1f5f9;
    padding-bottom: 8px;
}

.detail-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.detail-label {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-bottom: 4px;
    letter-spacing: 0.05em;
}

.detail-value {
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--text-main);
}

.highlight {
    color: var(--primary);
    font-weight: 700;
    font-size: 1.25rem;
}

.footnote {
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 24px;
    font-style: italic;
}

.spinner {
    width: 24px;
    height: 24px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s linear infinite;
}

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

.hidden {
    display: none !important;
}

footer {
    margin-top: 60px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
}

@media (max-width: 600px) {
    header h1 {
        font-size: 1.875rem;
    }
}