:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary: #64748b;
    --background: #f8fafc;
    --surface: #ffffff;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --error: #ef4444;
    --success: #22c55e;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--background);
    color: var(--text);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header */
header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
}

.auth-buttons, .user-menu {
    display: flex;
    gap: 0.75rem;
}

/* Buttons */
.btn {
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-block;
}

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

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

.btn-primary:disabled {
    background: var(--secondary);
    cursor: not-allowed;
}

.btn-secondary {
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--background);
}

.btn-outline {
    background: transparent;
    color: var(--secondary);
    border: 1px solid var(--border);
}

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

.btn-full {
    width: 100%;
}

/* Hero */
.hero {
    text-align: center;
    padding: 4rem 0;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.25rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

/* Datasets */
.datasets {
    padding: 4rem 0;
}

.datasets h2 {
    text-align: center;
    margin-bottom: 2rem;
}

.dataset-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.dataset-card {
    background: var(--surface);
    border-radius: 0.5rem;
    padding: 1.5rem;
    border: 1px solid var(--border);
    transition: box-shadow 0.2s;
}

.dataset-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.dataset-category {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.dataset-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.dataset-card p {
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.dataset-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.price {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text);
}

/* Modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
}

.modal {
    background: var(--surface);
    border-radius: 0.5rem;
    padding: 2rem;
    width: 100%;
    max-width: 400px;
}

.modal h2 {
    margin-bottom: 1.5rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.25rem;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: 0.375rem;
    font-size: 1rem;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
}

.error {
    color: var(--error);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.modal-footer {
    margin-top: 1rem;
    text-align: center;
    color: var(--text-muted);
}

.modal-footer a {
    color: var(--primary);
    text-decoration: none;
}

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

/* Account Page */
.account-page {
    padding: 2rem 0;
}

.account-page h1 {
    margin-bottom: 2rem;
}

.account-section {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.account-section h2 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border);
}

.empty-state {
    color: var(--text-muted);
}

.empty-state a {
    color: var(--primary);
}

/* Subscriptions */
.subscription-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.subscription-card {
    padding: 1rem;
    background: var(--background);
    border-radius: 0.375rem;
}

.subscription-card h3 {
    margin-bottom: 0.5rem;
}

.usage {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.usage-bar {
    height: 0.5rem;
    background: var(--border);
    border-radius: 0.25rem;
    overflow: hidden;
}

.usage-fill {
    height: 100%;
    background: var(--primary);
    transition: width 0.3s;
}

/* API Keys */
.api-key-form {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.api-key-form .input {
    flex: 1;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: 0.375rem;
}

.new-key-alert {
    background: #fef3c7;
    border: 1px solid #f59e0b;
    border-radius: 0.375rem;
    padding: 1rem;
    margin-bottom: 1rem;
}

.new-key-alert code {
    display: block;
    background: white;
    padding: 0.5rem;
    margin: 0.5rem 0;
    border-radius: 0.25rem;
    font-family: monospace;
    word-break: break-all;
}

.api-key-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.api-key-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--background);
    border-radius: 0.375rem;
}

.api-key-info h4 {
    margin-bottom: 0.25rem;
}

.key-meta {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.btn-danger {
    color: var(--error);
    border-color: var(--error);
}

.btn-danger:hover {
    background: var(--error);
    color: white;
}

/* Connection Info */
.connection-info {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.connection-item label {
    font-weight: 600;
    display: block;
    margin-bottom: 0.25rem;
}

.connection-item code {
    display: block;
    background: var(--background);
    padding: 0.5rem;
    border-radius: 0.25rem;
    font-family: monospace;
    font-size: 0.875rem;
}

.connection-item p {
    margin: 0.25rem 0;
    font-size: 0.875rem;
}

.connection-item p code {
    display: inline;
    padding: 0.125rem 0.25rem;
}