/* AI Book Writer Pro - Main Styles */
:root {
    --primary: #1A1F36;
    --accent: #5B8EF0;
    --accent-light: #7BA7FF;
    --background: #0D1117;
    --surface: #161B27;
    --surface-elevated: #1E2537;
    --border: #2A3252;
    --text-primary: #E8EBF5;
    --text-secondary: #8892B0;
    --text-muted: #4A5578;
    --success: #4ECCA3;
    --warning: #F6C90E;
    --error: #FF6B6B;
    --generating: #5B8EF0;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

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

/* Header */
.header {
    background-color: 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: bold;
    color: var(--accent);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

.nav-link:hover {
    color: var(--accent);
}

.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
}

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

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

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

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

/* Main content */
.main-content {
    padding: 2rem 0;
    min-height: calc(100vh - 140px);
}

/* Cards */
.card {
    background-color: var(--surface);
    border-radius: 8px;
    border: 1px solid var(--border);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

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

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
}

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

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

.form-control {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--surface-elevated);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 1rem;
}

.form-control:focus {
    outline: none;
    border-color: var(--accent);
}

textarea.form-control {
    min-height: 150px;
    resize: vertical;
    font-family: inherit;
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: 6px;
    margin-bottom: 1rem;
}

.alert-success {
    background-color: rgba(78, 204, 163, 0.1);
    border: 1px solid var(--success);
    color: var(--success);
}

.alert-error {
    background-color: rgba(255, 107, 107, 0.1);
    border: 1px solid var(--error);
    color: var(--error);
}

.alert-warning {
    background-color: rgba(246, 201, 14, 0.1);
    border: 1px solid var(--warning);
    color: var(--warning);
}

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

.book-card {
    background-color: var(--surface);
    border-radius: 8px;
    border: 1px solid var(--border);
    padding: 1.5rem;
    transition: transform 0.2s, border-color 0.2s;
}

.book-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
}

.book-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.book-topic {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.book-meta {
    display: flex;
    justify-content: space-between;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Progress bar */
.progress-bar {
    height: 8px;
    background-color: var(--surface-elevated);
    border-radius: 4px;
    overflow: hidden;
    margin: 1rem 0;
}

.progress-fill {
    height: 100%;
    background-color: var(--accent);
    border-radius: 4px;
    transition: width 0.3s;
}

/* Footer */
.footer {
    background-color: var(--surface);
    border-top: 1px solid var(--border);
    padding: 1.5rem 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Loading spinner */
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Responsive */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .books-grid {
        grid-template-columns: 1fr;
    }
}