* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: 'Nunito', sans-serif; background: #fafafa; color: #111; }

.nav { background: #fff; padding: 0 24px; display: flex; align-items: center; justify-content: space-between; height: 64px; border-bottom: 2px solid #f0f0f0; position: sticky; top: 0; z-index: 100; }
.nav-logo { font-size: 22px; font-weight: 800; color: #111; letter-spacing: -0.5px; text-decoration: none; }
.nav-logo span { color: #7c3aed; }
.nav-links { display: flex; gap: 16px; align-items: center; }
.nav-links a { color: #666; font-size: 14px; font-weight: 700; text-decoration: none; cursor: pointer; }
.nav-links a:hover { color: #7c3aed; }
.nav-cart { position: relative; cursor: pointer; font-size: 22px; }
.cart-badge { position: absolute; top: -6px; right: -8px; background: #7c3aed; color: #fff; font-size: 10px; font-weight: 800; border-radius: 50%; width: 18px; height: 18px; display: flex; align-items: center; justify-content: center; }

.hero { background: #f5f0fe; padding: 48px 24px 44px; text-align: center; position: relative; overflow: hidden; }
.hero-dots { position: absolute; inset: 0; background-image: radial-gradient(circle, #d8c4f7 1.5px, transparent 1.5px); background-size: 28px 28px; opacity: 0.5; }
.hero-inner { position: relative; z-index: 1; }
.hero-tag { display: inline-block; background: #7c3aed; color: #fff; font-size: 12px; font-weight: 800; padding: 5px 16px; border-radius: 50px; margin-bottom: 14px; }
.hero h1 { color: #111; font-size: 30px; font-weight: 900; margin-bottom: 8px; line-height: 1.2; }
.hero h1 span { color: #7c3aed; }
.hero p { color: #666; font-size: 15px; margin-bottom: 24px; font-weight: 600; }
.search-bar { display: flex; max-width: 500px; margin: 0 auto; background: #fff; border-radius: 50px; overflow: hidden; border: 2.5px solid #2d1b4e; box-shadow: 4px 4px 0 #2d1b4e; }
.search-bar input { flex: 1; border: none; padding: 12px 20px; font-size: 14px; outline: none; color: #111; font-family: inherit; font-weight: 600; background: transparent; }
.search-bar button { background: #2d1b4e; border: none; padding: 10px 22px; color: #fff; cursor: pointer; font-size: 14px; font-weight: 800; border-radius: 50px; margin: 3px; font-family: inherit; }
.search-bar button:hover { background: #44307a; }

.cats { background: #fff; padding: 0 20px; display: flex; gap: 4px; overflow-x: auto; scrollbar-width: none; border-bottom: 2px solid #f0f0f0; }
.cats::-webkit-scrollbar { display: none; }
.cat { padding: 14px 12px; color: #aaa; font-size: 13px; font-weight: 700; cursor: pointer; white-space: nowrap; border-bottom: 3px solid transparent; margin-bottom: -2px; }
.cat.active { color: #7c3aed; border-bottom-color: #7c3aed; }
.cat:hover { color: #111; }

.main { padding: 24px; max-width: 900px; margin: 0 auto; }
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 20px; }
.stat { background: #fff; border: 2px solid #f0f0f0; border-radius: 16px; padding: 16px; text-align: center; }
.stat-num { font-size: 24px; font-weight: 900; color: #7c3aed; }
.stat-label { font-size: 12px; color: #aaa; font-weight: 700; margin-top: 2px; }

.section-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.section-title { font-size: 18px; font-weight: 900; color: #111; }
.loading-msg { color: #aaa; font-weight: 700; font-size: 14px; padding: 20px 0; }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 14px; }
.card { background: #fff; border: 2.5px solid #f0f0f0; border-radius: 16px; overflow: hidden; cursor: pointer; transition: transform 0.15s, border-color 0.15s, box-shadow 0.15s; }
.card:hover { transform: translateY(-4px); border-color: #7c3aed; box-shadow: 0 8px 24px rgba(255,92,92,0.15); }
.card-img { height: 115px; display: flex; align-items: center; justify-content: center; font-size: 44px; position: relative; overflow: hidden; }
.card-img img { width: 100%; height: 100%; object-fit: cover; }
.discount-tag { position: absolute; top: 8px; left: 8px; background: #7c3aed; color: #fff; font-size: 11px; font-weight: 800; padding: 3px 8px; border-radius: 50px; z-index: 1; }
.card-body { padding: 10px 12px 12px; }
.card-title { font-size: 13px; font-weight: 700; margin-bottom: 3px; line-height: 1.3; color: #111; }
.card-seller { font-size: 12px; color: #666; font-weight: 600; margin-bottom: 2px; }
.card-residence { font-size: 11px; color: #aaa; font-weight: 600; margin-bottom: 6px; }
.card-stock { font-size: 11px; font-weight: 700; color: #2e7d32; margin-bottom: 6px; }
.card-stock.low { color: #e65c00; }
.card-stock.out { color: #9333ea; }
.card-footer { display: flex; align-items: center; justify-content: space-between; gap: 6px; }
.price { font-size: 15px; font-weight: 900; color: #111; }
.badge { font-size: 11px; font-weight: 700; padding: 3px 10px; border-radius: 50px; }
.btn-add-cart { background: #7c3aed; color: #fff; border: none; border-radius: 50px; font-size: 11px; font-weight: 800; padding: 5px 10px; cursor: pointer; font-family: inherit; white-space: nowrap; }
.btn-add-cart:hover { background: #6224c9; }
.btn-add-cart:disabled { background: #aaa; cursor: not-allowed; }

/* MODAL */
.modal-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 1000; align-items: center; justify-content: center; padding: 20px; }
.modal { background: #fff; border-radius: 20px; width: 100%; max-width: 440px; overflow: hidden; position: relative; max-height: 92vh; overflow-y: auto; }
.modal-close { position: absolute; top: 12px; right: 12px; background: rgba(0,0,0,0.15); border: none; border-radius: 50%; width: 32px; height: 32px; font-size: 14px; cursor: pointer; font-weight: 700; z-index: 10; }

/* IMAGE GALLERY */
.gallery { position: relative; background: #f5f5f5; height: 220px; overflow: hidden; }
.gallery-slides { display: flex; height: 100%; transition: transform 0.3s ease; }
.gallery-slide { min-width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; font-size: 60px; flex-shrink: 0; }
.gallery-slide img { width: 100%; height: 100%; object-fit: cover; }
.gallery-prev, .gallery-next { position: absolute; top: 50%; transform: translateY(-50%); background: rgba(255,255,255,0.9); border: none; border-radius: 50%; width: 32px; height: 32px; font-size: 14px; cursor: pointer; font-weight: 800; display: flex; align-items: center; justify-content: center; z-index: 5; }
.gallery-prev { left: 8px; }
.gallery-next { right: 8px; }
.gallery-dots { position: absolute; bottom: 8px; left: 50%; transform: translateX(-50%); display: flex; gap: 5px; }
.gallery-dot { width: 7px; height: 7px; border-radius: 50%; background: rgba(255,255,255,0.6); cursor: pointer; }
.gallery-dot.active { background: #fff; }

.modal-body { padding: 16px 20px 24px; }
.modal-badge { margin-bottom: 8px; }
.modal-title { font-size: 20px; font-weight: 800; margin-bottom: 6px; }
.modal-price { margin-bottom: 10px; }
.modal-desc { font-size: 14px; color: #666; margin-bottom: 12px; line-height: 1.5; font-weight: 600; }
.seller-info-box { background: #f9f9f9; border: 2px solid #f0f0f0; border-radius: 12px; padding: 12px 14px; font-size: 13px; font-weight: 600; color: #444; margin-bottom: 14px; display: flex; flex-direction: column; gap: 5px; }
.qty-row { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.qty-label { font-size: 13px; font-weight: 700; color: #444; }
.qty-ctrl { display: flex; align-items: center; gap: 8px; }
.qty-btn { background: #f0f0f0; border: none; border-radius: 50%; width: 30px; height: 30px; font-size: 16px; cursor: pointer; font-weight: 800; display: flex; align-items: center; justify-content: center; }
.qty-btn:hover { background: #e0e0e0; }
.qty-num { font-size: 16px; font-weight: 800; min-width: 24px; text-align: center; }
.btn-order { width: 100%; background: #7c3aed; color: #fff; border: none; padding: 14px; border-radius: 50px; font-size: 15px; font-weight: 800; cursor: pointer; font-family: inherit; margin-bottom: 8px; }
.btn-order:hover { background: #6224c9; }
.btn-order-cart { width: 100%; background: #2d1b4e; color: #fff; border: none; padding: 12px; border-radius: 50px; font-size: 14px; font-weight: 800; cursor: pointer; font-family: inherit; }
.btn-order-cart:hover { background: #44307a; }

/* CONTACT MODAL */
.contact-box { background: #f9f9f9; border: 2px solid #f0f0f0; border-radius: 14px; padding: 16px; }
.contact-item { display: flex; justify-content: space-between; align-items: center; padding: 8px 0; border-bottom: 1px solid #f0f0f0; }
.contact-item:last-of-type { border-bottom: none; }
.contact-label { font-size: 13px; font-weight: 700; color: #888; }
.contact-value { font-size: 14px; font-weight: 800; color: #111; }

/* CART DRAWER */
.cart-drawer { position: fixed; right: -100%; top: 0; height: 100vh; width: 100%; max-width: 400px; background: #fff; z-index: 200; box-shadow: -4px 0 24px rgba(0,0,0,0.12); transition: right 0.3s ease; display: flex; flex-direction: column; }
.cart-drawer.open { right: 0; }
.cart-header { padding: 20px 24px; border-bottom: 2px solid #f0f0f0; display: flex; align-items: center; justify-content: space-between; }
.cart-header h2 { font-size: 18px; font-weight: 900; }
.cart-close { background: none; border: none; font-size: 20px; cursor: pointer; font-weight: 700; }
.cart-body { flex: 1; overflow-y: auto; padding: 16px 24px; }
.cart-item { display: flex; gap: 12px; align-items: center; padding: 12px 0; border-bottom: 1px solid #f0f0f0; }
.cart-item-img { width: 52px; height: 52px; border-radius: 10px; object-fit: cover; background: #f5f5f5; display: flex; align-items: center; justify-content: center; font-size: 22px; flex-shrink: 0; overflow: hidden; }
.cart-item-img img { width: 100%; height: 100%; object-fit: cover; }
.cart-item-info { flex: 1; }
.cart-item-title { font-size: 13px; font-weight: 700; margin-bottom: 2px; }
.cart-item-price { font-size: 13px; font-weight: 800; color: #7c3aed; }
.cart-item-seller { font-size: 11px; color: #aaa; font-weight: 600; }
.cart-item-remove { background: none; border: none; color: #9333ea; font-size: 18px; cursor: pointer; padding: 4px; }
.cart-footer { padding: 16px 24px; border-top: 2px solid #f0f0f0; }
.cart-total { display: flex; justify-content: space-between; align-items: center; margin-bottom: 14px; }
.cart-total-label { font-size: 15px; font-weight: 700; color: #666; }
.cart-total-price { font-size: 20px; font-weight: 900; color: #111; }
.btn-checkout { width: 100%; background: #7c3aed; color: #fff; border: none; padding: 14px; border-radius: 50px; font-size: 15px; font-weight: 800; cursor: pointer; font-family: inherit; }
.btn-checkout:hover { background: #6224c9; }
.cart-empty { text-align: center; padding: 40px 20px; color: #aaa; font-weight: 700; font-size: 15px; }
.cart-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.3); z-index: 199; }
.cart-overlay.open { display: block; }
.qty-ctrl-cart { display: flex; align-items: center; gap: 6px; }
.qty-btn-sm { background: #f0f0f0; border: none; border-radius: 50%; width: 24px; height: 24px; font-size: 13px; cursor: pointer; font-weight: 800; }

/* AUTH */
.auth-main { min-height: calc(100vh - 64px); display: flex; align-items: center; justify-content: center; padding: 24px; }
.auth-card { background: #fff; border: 2.5px solid #f0f0f0; border-radius: 20px; padding: 32px; width: 100%; max-width: 420px; }
.auth-tabs { display: flex; margin-bottom: 24px; background: #f5f5f5; border-radius: 12px; padding: 4px; }
.auth-tab { flex: 1; border: none; background: transparent; padding: 10px; font-family: inherit; font-size: 14px; font-weight: 700; cursor: pointer; border-radius: 10px; color: #aaa; }
.auth-tab.active { background: #fff; color: #111; box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
.auth-title { font-size: 22px; font-weight: 900; margin-bottom: 4px; }
.auth-sub { font-size: 14px; color: #888; font-weight: 600; margin-bottom: 20px; }
.auth-error { font-size: 13px; font-weight: 700; color: #9333ea; margin-bottom: 12px; min-height: 18px; }
.role-selector { display: flex; gap: 8px; margin-bottom: 16px; }
.role-btn { flex: 1; border: 2px solid #f0f0f0; background: #fff; padding: 12px; border-radius: 12px; font-family: inherit; font-size: 13px; font-weight: 700; cursor: pointer; color: #888; text-align: center; }
.role-btn.active { border-color: #7c3aed; color: #7c3aed; background: #f5f0fe; }
.pw-wrap { position: relative; }
.pw-wrap input { padding-right: 44px; }
.pw-toggle { position: absolute; right: 12px; top: 50%; transform: translateY(-50%); background: none; border: none; cursor: pointer; font-size: 16px; }

/* FORMS */
.form-group { margin-bottom: 14px; }
.form-group label { display: block; font-size: 13px; font-weight: 700; margin-bottom: 6px; color: #444; }
.form-group input, .form-group select, .form-group textarea { width: 100%; border: 2px solid #f0f0f0; border-radius: 10px; padding: 10px 14px; font-size: 14px; font-family: inherit; font-weight: 600; color: #111; outline: none; background: #fff; }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { border-color: #7c3aed; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.form-error { font-size: 13px; font-weight: 700; color: #9333ea; margin-bottom: 12px; min-height: 18px; }
.btn-primary { width: 100%; background: #7c3aed; color: #fff; border: none; padding: 13px; border-radius: 50px; font-size: 15px; font-weight: 800; cursor: pointer; font-family: inherit; }
.btn-primary:hover { background: #6224c9; }
.btn-primary:disabled { background: #ffb3b3; cursor: not-allowed; }
.form-card { background: #fff; border: 2.5px solid #f0f0f0; border-radius: 20px; padding: 24px; margin-bottom: 16px; }

/* DASHBOARD TABS */
.dash-tabs { display: flex; gap: 8px; margin-bottom: 24px; flex-wrap: wrap; }
.dash-tab { border: 2px solid #f0f0f0; background: #fff; padding: 10px 18px; border-radius: 50px; font-family: inherit; font-size: 13px; font-weight: 700; cursor: pointer; color: #888; }
.dash-tab.active { background: #7c3aed; color: #fff; border-color: #7c3aed; }

/* LISTING ROWS */
.listing-row { background: #fff; border: 2px solid #f0f0f0; border-radius: 14px; padding: 14px 16px; display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; gap: 12px; }
.listing-info { flex: 1; }
.listing-title { font-size: 14px; font-weight: 700; color: #111; margin-bottom: 4px; }
.listing-meta { font-size: 12px; color: #888; font-weight: 600; }
.listing-actions { display: flex; gap: 8px; flex-shrink: 0; flex-wrap: wrap; }
.btn-sm { border: none; padding: 7px 14px; border-radius: 50px; font-size: 12px; font-weight: 700; cursor: pointer; font-family: inherit; }
.btn-toggle { background: #f0f0f0; color: #444; }
.btn-toggle:hover { background: #e0e0e0; }
.btn-delete { background: #fff0f0; color: #9333ea; }
.btn-delete:hover { background: #ffdddd; }

/* UPLOAD SLOTS */
.upload-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 10px; margin-bottom: 8px; }
.upload-slot { border: 2.5px dashed #f0f0f0; border-radius: 12px; aspect-ratio: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; cursor: pointer; background: #fafafa; transition: border-color 0.15s; position: relative; overflow: hidden; }
.upload-slot:hover { border-color: #7c3aed; background: #f5f0fe; }
.upload-slot img { width: 100%; height: 100%; object-fit: cover; }
.slot-remove { position: absolute; top: 4px; right: 4px; background: rgba(0,0,0,0.6); color: #fff; border: none; border-radius: 50%; width: 22px; height: 22px; font-size: 11px; cursor: pointer; display: none; align-items: center; justify-content: center; font-weight: 700; z-index: 10; }

/* ORDER CARDS */
.order-card { background: #fff; border: 2px solid #f0f0f0; border-radius: 16px; padding: 16px; margin-bottom: 12px; }
.order-card.order-new { border-color: #7c3aed; background: #fff9f9; }
.order-card-title { font-size: 15px; font-weight: 800; margin-bottom: 8px; }
.order-detail { font-size: 13px; font-weight: 600; color: #555; margin-bottom: 4px; }
.order-badge { display: inline-block; font-size: 11px; font-weight: 700; padding: 3px 10px; border-radius: 50px; margin-bottom: 10px; }
.badge-new { background: #f5f0fe; color: #7c3aed; }
.badge-done { background: #e8f5e9; color: #2e7d32; }

/* PAYWALL */
.paywall-screen { min-height: calc(100vh - 64px); display: flex; align-items: center; justify-content: center; padding: 24px; background: #fafafa; }
.paywall-card { background: #fff; border: 2.5px solid #f0f0f0; border-radius: 20px; padding: 40px 32px; max-width: 400px; width: 100%; text-align: center; }
.paywall-icon { font-size: 48px; margin-bottom: 16px; }
.paywall-title { font-size: 22px; font-weight: 900; margin-bottom: 8px; }
.paywall-sub { font-size: 14px; color: #888; font-weight: 600; margin-bottom: 24px; line-height: 1.6; }

/* FOOTER */
.footer { background: #1e1033; color: #fff; padding: 32px 24px; margin-top: 48px; text-align: center; }
.footer-title { font-size: 16px; font-weight: 800; margin-bottom: 8px; }
.footer-sub { font-size: 13px; color: rgba(255,255,255,0.6); font-weight: 600; margin-bottom: 16px; }
.footer-links { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.footer-link { color: rgba(255,255,255,0.7); font-size: 13px; font-weight: 700; text-decoration: none; }
.footer-link:hover { color: #7c3aed; }
.footer-copy { font-size: 12px; color: rgba(255,255,255,0.3); margin-top: 16px; font-weight: 600; }

/* ADMIN TABS */
.admin-tabs { display: flex; gap: 8px; margin-bottom: 24px; flex-wrap: wrap; }
.admin-tab { border: 2px solid #f0f0f0; background: #fff; padding: 10px 20px; border-radius: 50px; font-family: inherit; font-size: 13px; font-weight: 700; cursor: pointer; color: #888; }
.admin-tab.active { background: #7c3aed; color: #fff; border-color: #7c3aed; }
.search-admin { width: 100%; border: 2px solid #f0f0f0; border-radius: 10px; padding: 10px 14px; font-size: 14px; font-family: inherit; font-weight: 600; color: #111; outline: none; margin-bottom: 16px; }
.search-admin:focus { border-color: #7c3aed; }
.empty-msg { text-align: center; padding: 40px 20px; color: #aaa; font-weight: 700; font-size: 15px; }
.seller-row { background: #fff; border: 2px solid #f0f0f0; border-radius: 14px; padding: 14px 16px; display: flex; align-items: center; gap: 12px; margin-bottom: 10px; }
.seller-avatar { width: 40px; height: 40px; background: #f5f0fe; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 18px; flex-shrink: 0; }
.badge-admin { background: #f5f0fe; color: #7c3aed; font-size: 11px; font-weight: 700; padding: 3px 8px; border-radius: 50px; }
.toggle-switch { position: relative; width: 52px; height: 28px; }
.toggle-switch input { opacity: 0; width: 0; height: 0; }
.toggle-slider { position: absolute; inset: 0; background: #ccc; border-radius: 50px; cursor: pointer; transition: 0.2s; }
.toggle-slider:before { content: ''; position: absolute; width: 22px; height: 22px; left: 3px; bottom: 3px; background: #fff; border-radius: 50%; transition: 0.2s; }
input:checked + .toggle-slider { background: #7c3aed; }
input:checked + .toggle-slider:before { transform: translateX(24px); }

@media (max-width: 500px) {
  .hero h1 { font-size: 24px; }
  .form-row { grid-template-columns: 1fr; }
  .stats { gap: 6px; }
  .stat { padding: 12px 8px; }
  .stat-num { font-size: 20px; }
  .nav-links a:nth-child(1), .nav-links a:nth-child(2) { display: none; }
}

/* TEXTBOOK DRILL-DOWN PANEL */
.tb-panel { background: #fff; border-bottom: 2px solid #f0f0f0; padding: 18px 20px; }
.tb-crumbs { display: flex; align-items: center; gap: 6px; font-size: 12px; font-weight: 700; color: #aaa; margin-bottom: 14px; flex-wrap: wrap; }
.tb-crumb { cursor: pointer; color: #7c3aed; }
.tb-crumb:hover { text-decoration: underline; }
.tb-crumb-sep { color: #ccc; }
.tb-crumb-current { color: #555; }
.tb-heading { font-size: 15px; font-weight: 800; color: #111; margin-bottom: 12px; }
.tb-year-grid { display: flex; gap: 10px; flex-wrap: wrap; }
.tb-year-btn { background: #f5f0fe; border: 2px solid #e3d4fb; color: #7c3aed; font-family: inherit; font-weight: 800; font-size: 14px; padding: 14px 22px; border-radius: 14px; cursor: pointer; transition: 0.15s; }
.tb-year-btn:hover { background: #7c3aed; color: #fff; border-color: #7c3aed; }
.tb-year-all { background: #fff; border: 2px dashed #ddd; color: #888; }
.tb-year-all:hover { background: #f5f0fe; color: #7c3aed; border-color: #7c3aed; }
.tb-faculty-block { margin-bottom: 16px; }
.tb-faculty-title { font-size: 13px; font-weight: 800; color: #7c3aed; text-transform: uppercase; letter-spacing: 0.3px; margin-bottom: 8px; }
.tb-subject-grid { display: flex; gap: 8px; flex-wrap: wrap; }
.tb-subject-btn { background: #fafafa; border: 2px solid #f0f0f0; color: #444; font-family: inherit; font-weight: 700; font-size: 12.5px; padding: 9px 14px; border-radius: 10px; cursor: pointer; transition: 0.15s; }
.tb-subject-btn:hover { background: #f5f0fe; border-color: #d8c4f7; color: #7c3aed; }
.tb-subject-btn.active { background: #7c3aed; border-color: #7c3aed; color: #fff; }
.tb-view-all-year { background: #111; color: #fff; border: none; font-family: inherit; font-weight: 800; font-size: 13px; padding: 10px 18px; border-radius: 10px; cursor: pointer; margin-bottom: 16px; }
.tb-view-all-year:hover { background: #7c3aed; }