:root {
    --bg: #0b0c10;
    --surface: #12141a;
    --card: #181a24;
    --border: #252836;
    --text: #e8e8f0;
    --muted: #8a8aa0;
    --accent: #ff4d6d;
    --accent2: #c9184a;
    --success: #00d26a;
    --font: 'Segoe UI', system-ui, sans-serif;
}

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

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

.store-app { min-height: 100vh; display: flex; flex-direction: column; }

.store-header {
    background: linear-gradient(180deg, rgba(255,77,109,0.08), transparent);
    border-bottom: 1px solid var(--border);
    padding: 24px 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}

.store-header .brand h1 { font-size: 28px; letter-spacing: 2px; }
.store-header .brand p { font-size: 13px; color: var(--muted); margin-top: 4px; }

.store-nav { display: flex; gap: 12px; }
.store-nav a {
    color: var(--muted);
    text-decoration: none;
    font-size: 14px;
    padding: 8px 12px;
    border-radius: 8px;
    border: 1px solid transparent;
    transition: all .2s;
}
.store-nav a:hover, .store-nav a.active { color: var(--text); border-color: var(--border); background: var(--surface); }

.store-main {
    flex: 1;
    padding: 28px 32px;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

.toolbar {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}
.toolbar input, .toolbar select {
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 10px 12px;
    font-size: 14px;
    outline: none;
}
.toolbar input { flex: 1; min-width: 220px; }
.toolbar select { min-width: 180px; }

.catalog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 18px;
}

.book-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 18px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    transition: transform .15s, border-color .15s;
}
.book-card:hover { transform: translateY(-2px); border-color: #333; }

.book-title { font-size: 16px; font-weight: 700; line-height: 1.3; }
.book-meta { font-size: 12px; color: var(--muted); display: flex; flex-direction: column; gap: 4px; }
.book-price { font-size: 20px; font-weight: 700; color: var(--accent); margin-top: 4px; }

.btn {
    padding: 10px 16px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    cursor: pointer;
    font-size: 14px;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}
.btn:hover { background: #23252f; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: white; }
.btn-primary:hover { background: var(--accent2); }

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}
.modal {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 24px;
    width: 92%;
    max-width: 520px;
    max-height: 92vh;
    overflow-y: auto;
}
.modal h3 { margin-bottom: 16px; }
.form-group { margin-bottom: 14px; }
.form-group label { display: block; font-size: 12px; color: var(--muted); margin-bottom: 6px; text-transform: uppercase; letter-spacing: 1px; }
.form-group input {
    width: 100%;
    padding: 10px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text);
    font-size: 14px;
}
.modal-actions { display: flex; gap: 12px; justify-content: flex-end; margin-top: 18px; }

.success-box { background: rgba(0,210,106,0.08); border: 1px solid rgba(0,210,106,0.25); border-radius: 10px; padding: 14px; }
.success-box a { color: var(--accent); word-break: break-all; }

.empty-state { text-align: center; padding: 60px 20px; color: var(--muted); }
.empty-state h3 { color: var(--text); margin-bottom: 8px; }