/* Reset & Base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: #0f1117;
    color: #e8e8e8;
    min-height: 100vh;
}

a { color: #7c9fff; text-decoration: none; }
a:hover { text-decoration: underline; }

/* Header */
.site-header {
    background: #1a1d27;
    border-bottom: 1px solid #2a2d3a;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.site-logo { font-size: 1.4rem; font-weight: 700; color: #7c9fff; }
.site-logo span { color: #e8e8e8; }

.site-nav { display: flex; gap: 1.5rem; align-items: center; font-size: 0.9rem; }
.site-nav a { color: #aaa; }
.site-nav a:hover { color: #e8e8e8; text-decoration: none; }

/* Layout */
.container { max-width: 1200px; margin: 0 auto; padding: 2rem; }

/* Hero */
.hero {
    text-align: center;
    padding: 4rem 2rem;
    border-bottom: 1px solid #2a2d3a;
}
.hero h1 { font-size: 2.5rem; font-weight: 700; margin-bottom: 1rem; }
.hero p { color: #888; font-size: 1.1rem; max-width: 600px; margin: 0 auto 2rem; }

/* Book Grid */
.book-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1.5rem;
}

.book-card {
    background: #1a1d27;
    border: 1px solid #2a2d3a;
    border-radius: 12px;
    overflow: hidden;
    transition: border-color 0.2s, transform 0.2s;
    cursor: pointer;
}

.book-card:hover { border-color: #7c9fff; transform: translateY(-2px); }

.book-cover {
    width: 100%;
    aspect-ratio: 2/3;
    background: linear-gradient(135deg, #1a2a3a, #2a1a3a);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
}

.book-cover img { width: 100%; height: 100%; object-fit: cover; }

.book-info { padding: 1rem; }
.book-info h3 { font-size: 0.95rem; font-weight: 600; margin-bottom: 0.25rem; }
.book-info .author { font-size: 0.8rem; color: #888; margin-bottom: 0.5rem; }
.book-info .genre { font-size: 0.75rem; color: #7c9fff; }

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.7rem 1.4rem;
    border-radius: 8px;
    border: none;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s;
    text-align: center;
}
.btn:hover { opacity: 0.85; text-decoration: none; }
.btn-primary { background: #7c9fff; color: #0f1117; }
.btn-secondary { background: #2a2d3a; color: #e8e8e8; }
.btn-sm { padding: 0.4rem 0.9rem; font-size: 0.85rem; }

/* Auth */
.auth-page { display: flex; align-items: center; justify-content: center; min-height: 100vh; }
.auth-container {
    background: #1a1d27;
    border: 1px solid #2a2d3a;
    border-radius: 12px;
    padding: 2.5rem;
    width: 100%;
    max-width: 420px;
}
.auth-logo { text-align: center; margin-bottom: 2rem; }
.auth-logo h1 { font-size: 1.8rem; color: #7c9fff; font-weight: 700; }
.auth-logo p { color: #888; font-size: 0.9rem; margin-top: 0.25rem; }
.auth-links { display: flex; justify-content: space-between; margin-top: 1.5rem; font-size: 0.85rem; }

/* Forms */
.form-group { margin-bottom: 1.25rem; }
.form-group label { display: block; font-size: 0.85rem; color: #aaa; margin-bottom: 0.4rem; }
.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    background: #0f1117;
    border: 1px solid #2a2d3a;
    border-radius: 8px;
    padding: 0.65rem 0.9rem;
    color: #e8e8e8;
    font-size: 0.95rem;
}
.form-group input:focus, .form-group select:focus { outline: none; border-color: #7c9fff; }

/* Alerts */
.alert { padding: 0.75rem 1rem; border-radius: 8px; margin-bottom: 1.25rem; font-size: 0.9rem; }
.alert-error { background: #3a1a1a; border: 1px solid #ff6b6b; color: #ff9999; }
.alert-success { background: #1a3a1a; border: 1px solid #6bff6b; color: #99ff99; }
.alert-info { background: #1a1a3a; border: 1px solid #6b6bff; color: #9999ff; }

/* Badge */
.badge { padding: 0.2rem 0.6rem; border-radius: 20px; font-size: 0.75rem; font-weight: 600; }
.badge-genre { background: #1a2a3a; color: #7c9fff; }

/* Footer */
.site-footer {
    border-top: 1px solid #2a2d3a;
    padding: 2rem;
    text-align: center;
    color: #888;
    font-size: 0.85rem;
    margin-top: 4rem;
}