:root {
    --primary: #4F46E5;
    --primary-hover: #4338CA;
    --secondary: #10B981;
    --bg-color: #F8FAFC;
    --text-main: #0F172A;
    --text-muted: #64748B;
    --white: #FFFFFF;
    --border: #E2E8F0;
    --error: #EF4444;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 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', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Typography */
h1 {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
    color: var(--text-main);
}

.highlight {
    color: var(--primary);
}

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

/* Navbar */
.navbar {
    background-color: var(--white);
    box-shadow: var(--shadow-sm);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-main);
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 500;
    transition: color 0.2s ease;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--primary);
}

/* Hero Section */
.hero {
    padding: 4rem 0;
    text-align: center;
    background: linear-gradient(135deg, #EEF2FF 0%, #F0FDF4 100%);
    border-bottom: 1px solid var(--border);
}

/* Search Container */
.search-container {
    max-width: 800px;
    margin: 3rem auto 0;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

/* Tabs */
.tabs {
    display: flex;
    border-bottom: 1px solid var(--border);
}

.tab-btn {
    flex: 1;
    padding: 1.25rem;
    border: none;
    background: #F8FAFC;
    color: var(--text-muted);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.tab-btn:hover {
    background: #F1F5F9;
}

.tab-btn.active {
    background: var(--white);
    color: var(--primary);
    border-bottom: 3px solid var(--primary);
}

.tab-content {
    display: none;
    padding: 2.5rem;
    text-align: left;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Forms */
.input-group {
    display: flex;
    gap: 1rem;
}

input[type="text"], select {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    color: var(--text-main);
    font-family: inherit;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input[type="text"]:focus, select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

select:disabled {
    background-color: #F1F5F9;
    cursor: not-allowed;
    opacity: 0.7;
}

.form-group {
    margin-bottom: 1.5rem;
    flex: 1;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-main);
}

.form-row {
    display: flex;
    gap: 1.5rem;
}

/* Buttons */
.btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.1s ease;
}

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

.primary-btn:hover:not(:disabled) {
    background-color: var(--primary-hover);
}

.primary-btn:active:not(:disabled) {
    transform: scale(0.98);
}

.primary-btn:disabled {
    background-color: #A5B4FC;
    cursor: not-allowed;
}

.full-width {
    width: 100%;
}

.error-message {
    color: var(--error);
    font-size: 0.875rem;
    margin-top: 0.5rem;
    display: none;
}

/* Results Section */
.results-section {
    padding: 4rem 0;
    flex-grow: 1;
}

.hidden {
    display: none;
}

.result-card {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    max-width: 800px;
    margin: 0 auto;
    overflow: hidden;
    animation: fadeIn 0.4s ease;
}

.card-header {
    background: var(--primary);
    color: var(--white);
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
}

.badge {
    background: rgba(255, 255, 255, 0.2);
    padding: 0.5rem 1rem;
    border-radius: 999px;
    font-weight: 600;
    font-family: monospace;
    font-size: 1.125rem;
    letter-spacing: 1px;
}

.card-body {
    padding: 2rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.detail-item {
    display: flex;
    flex-direction: column;
}

.detail-item .label {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: 0.25rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

/* Footer */
footer {
    background: var(--white);
    padding: 2rem 0;
    text-align: center;
    border-top: 1px solid var(--border);
    margin-top: auto;
}

/* Responsive */
@media (max-width: 768px) {
    h1 { font-size: 2.25rem; }
    
    .input-group {
        flex-direction: column;
    }
    
    .form-row {
        flex-direction: column;
        gap: 0;
    }
    
    .card-body {
        grid-template-columns: 1fr;
    }
    
    .card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
}