/* ============================================
   ShelfSnap - Publication Catalog
   Mobile-first design with CSS variable theming
   ============================================ */

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

:root {
    --color-primary: #e8c547;
    --color-primary-light: #f5e6a3;
    --color-secondary: #c44536;
    --color-bg: #0d0d0d;
    --color-surface: #1a1a1a;
    --color-surface-hover: #252525;
    --color-card-bg: #141414;
    --color-text: #e8e6e1;
    --color-text-muted: #8a8780;
    --color-border: #2a2a28;
    --color-accent: #e8c547;
    --color-success: #4a9c6d;
    --color-warning: #d4943a;
    --color-error: #c44536;
    --font-display: 'Playfair Display', serif;
    --font-mono: 'Space Mono', monospace;
    --font-body: 'DM Sans', sans-serif;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.5);
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

html, body {
    height: 100%;
    font-family: var(--font-body);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

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

/* Top Bar */
.top-bar {
    position: sticky; top: 0; z-index: 100;
    background: color-mix(in srgb, var(--color-surface) 92%, transparent);
    border-bottom: 1px solid var(--color-border);
    backdrop-filter: blur(12px);
    padding: 0 1rem; height: 60px;
    display: flex; align-items: center; justify-content: space-between; gap: 0.75rem;
}
.top-bar .logo {
    font-family: var(--font-display); font-weight: 900; font-size: 1.35rem;
    color: var(--color-primary); letter-spacing: -0.02em;
    display: flex; align-items: center; gap: 0.5rem; white-space: nowrap;
}
.top-bar .logo .logo-icon { font-size: 1.1rem; opacity: 0.8; }
.top-bar-actions { display: flex; align-items: center; gap: 0.5rem; }

/* Main Content */
.main-content {
    flex: 1; padding: 1rem; max-width: 1200px;
    margin: 0 auto; width: 100%; padding-bottom: 80px;
}
@media (min-width: 768px) { .main-content { padding: 1.5rem 2rem; padding-bottom: 2rem; } }

/* Bottom Nav */
.bottom-nav {
    position: fixed; bottom: 0; left: 0; right: 0; z-index: 100;
    background: var(--color-surface); border-top: 1px solid var(--color-border);
    display: flex; align-items: center; justify-content: space-around;
    height: 64px; padding-bottom: env(safe-area-inset-bottom, 0);
}
@media (min-width: 768px) { .bottom-nav { display: none; } }
.bottom-nav a, .bottom-nav button {
    display: flex; flex-direction: column; align-items: center; gap: 0.2rem;
    padding: 0.5rem 0.75rem; font-size: 0.65rem; font-family: var(--font-mono);
    text-transform: uppercase; letter-spacing: 0.05em; color: var(--color-text-muted);
    text-decoration: none; background: none; border: none; cursor: pointer;
    transition: color var(--transition-fast);
}
.bottom-nav a:hover, .bottom-nav button:hover, .bottom-nav a.active, .bottom-nav button.active { color: var(--color-primary); }
.bottom-nav .nav-icon { font-size: 1.2rem; }
.nav-scan-btn {
    background: var(--color-primary) !important; color: var(--color-bg) !important;
    width: 52px; height: 52px; border-radius: 50% !important; margin-top: -20px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.4);
    display: flex !important; flex-direction: row !important; align-items: center; justify-content: center;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.nav-scan-btn:hover { transform: scale(1.08); }
.nav-scan-btn .nav-icon { font-size: 1.4rem; }

/* Cards */
.card {
    background: var(--color-card-bg); border: 1px solid var(--color-border);
    border-radius: var(--radius-md); transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
    overflow: hidden;
}
.card:hover { border-color: color-mix(in srgb, var(--color-primary) 30%, var(--color-border)); box-shadow: var(--shadow-md); }

/* Publication Card Grid */
.pub-card { display: flex; flex-direction: column; cursor: pointer; position: relative; }
.pub-card .cover-wrapper {
    position: relative; width: 100%; aspect-ratio: 2/3; overflow: hidden;
    background: var(--color-surface); display: flex; align-items: center; justify-content: center;
}
.pub-card .cover-wrapper img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--transition-slow); }
.pub-card:hover .cover-wrapper img { transform: scale(1.05); }
.pub-card .cover-placeholder {
    display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 0.5rem;
    color: var(--color-text-muted); font-size: 2rem; width: 100%; height: 100%;
    background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-card-bg) 100%);
}
.pub-card .cover-placeholder span { font-size: 0.7rem; font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.1em; }
.pub-card .type-badge {
    position: absolute; top: 0.5rem; left: 0.5rem;
    padding: 0.15rem 0.5rem; font-size: 0.6rem; font-family: var(--font-mono);
    text-transform: uppercase; letter-spacing: 0.08em; border-radius: var(--radius-sm);
    background: var(--color-bg); color: var(--color-primary); border: 1px solid var(--color-border); opacity: 0.9;
}
.pub-card .fav-badge { position: absolute; top: 0.5rem; right: 0.5rem; color: var(--color-warning); font-size: 0.9rem; }
.pub-card .pub-info { padding: 0.75rem; display: flex; flex-direction: column; gap: 0.25rem; }
.pub-card .pub-title {
    font-family: var(--font-display); font-weight: 700; font-size: 0.9rem; line-height: 1.3;
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.pub-card .pub-author { font-size: 0.75rem; color: var(--color-text-muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.pub-card .pub-year { font-family: var(--font-mono); font-size: 0.7rem; color: var(--color-text-muted); }

/* List View */
.pub-list-item {
    display: flex; gap: 0.75rem; padding: 0.75rem; cursor: pointer;
    border-bottom: 1px solid var(--color-border); transition: background var(--transition-fast);
}
.pub-list-item:hover { background: var(--color-surface-hover); }
.pub-list-item:last-child { border-bottom: none; }
.pub-list-item .list-cover { width: 48px; height: 72px; border-radius: var(--radius-sm); overflow: hidden; flex-shrink: 0; background: var(--color-surface); }
.pub-list-item .list-cover img { width: 100%; height: 100%; object-fit: cover; }
.pub-list-item .list-cover-placeholder { width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; color: var(--color-text-muted); font-size: 1rem; background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-card-bg) 100%); }
.pub-list-item .list-info { flex: 1; min-width: 0; display: flex; flex-direction: column; justify-content: center; gap: 0.15rem; }
.pub-list-item .list-title { font-weight: 600; font-size: 0.85rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.pub-list-item .list-meta { font-size: 0.75rem; color: var(--color-text-muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* Grid Layouts */
.pub-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.75rem; }
@media (min-width: 500px) { .pub-grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 768px) { .pub-grid { grid-template-columns: repeat(4, 1fr); gap: 1rem; } }
@media (min-width: 1024px) { .pub-grid { grid-template-columns: repeat(5, 1fr); } }

/* Buttons */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
    padding: 0.6rem 1.2rem; font-family: var(--font-body); font-size: 0.85rem; font-weight: 500;
    border: 1px solid var(--color-border); border-radius: var(--radius-md); cursor: pointer;
    transition: all var(--transition-fast); text-decoration: none; white-space: nowrap;
    background: var(--color-surface); color: var(--color-text);
}
.btn:hover { background: var(--color-surface-hover); border-color: var(--color-text-muted); }
.btn-primary { background: var(--color-primary); color: var(--color-bg); border-color: var(--color-primary); font-weight: 600; }
.btn-primary:hover { background: var(--color-primary-light); border-color: var(--color-primary-light); }
.btn-danger { color: var(--color-error); border-color: var(--color-error); }
.btn-danger:hover { background: var(--color-error); color: white; }
.btn-ghost { background: transparent; border-color: transparent; color: var(--color-text-muted); }
.btn-ghost:hover { color: var(--color-text); background: var(--color-surface-hover); }
.btn-sm { padding: 0.35rem 0.75rem; font-size: 0.75rem; }
.btn-icon { width: 36px; height: 36px; padding: 0; border-radius: var(--radius-sm); }
.btn:disabled { opacity: 0.4; pointer-events: none; }

/* Inputs */
.input-group { display: flex; flex-direction: column; gap: 0.35rem; }
.input-group label { font-size: 0.75rem; font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.06em; color: var(--color-text-muted); }
input[type="text"], input[type="number"], input[type="url"], input[type="search"], textarea, select {
    width: 100%; padding: 0.65rem 0.85rem; font-family: var(--font-body); font-size: 0.9rem;
    color: var(--color-text); background: var(--color-surface); border: 1px solid var(--color-border);
    border-radius: var(--radius-md); outline: none; transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
input:focus, textarea:focus, select:focus { border-color: var(--color-primary); box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 15%, transparent); }
textarea { resize: vertical; min-height: 80px; }
select {
    cursor: pointer; appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M2 4l4 4 4-4' fill='none' stroke='%238a8780' stroke-width='1.5'/%3E%3C/svg%3E");
    background-repeat: no-repeat; background-position: right 0.75rem center; padding-right: 2rem;
}

/* Search */
.search-bar { position: relative; display: flex; align-items: center; }
.search-bar input { padding-left: 2.5rem; }
.search-bar .search-icon { position: absolute; left: 0.85rem; color: var(--color-text-muted); pointer-events: none; font-size: 0.9rem; }

/* Filter Chips */
.filter-bar { display: flex; gap: 0.5rem; overflow-x: auto; padding-bottom: 0.5rem; scrollbar-width: none; }
.filter-bar::-webkit-scrollbar { display: none; }
.filter-chip {
    display: inline-flex; align-items: center; gap: 0.35rem; padding: 0.35rem 0.75rem;
    font-size: 0.75rem; font-family: var(--font-mono); background: var(--color-surface);
    border: 1px solid var(--color-border); border-radius: 999px; cursor: pointer;
    transition: all var(--transition-fast); white-space: nowrap; color: var(--color-text-muted);
}
.filter-chip:hover { border-color: var(--color-text-muted); color: var(--color-text); }
.filter-chip.active { background: var(--color-primary); border-color: var(--color-primary); color: var(--color-bg); }

/* Stats */
.stats-bar { display: flex; gap: 1rem; padding: 1rem; overflow-x: auto; scrollbar-width: none; }
.stats-bar::-webkit-scrollbar { display: none; }
.stat-item { text-align: center; min-width: 80px; flex-shrink: 0; }
.stat-item .stat-value { font-family: var(--font-display); font-size: 1.5rem; font-weight: 900; color: var(--color-primary); line-height: 1; }
.stat-item .stat-label { font-family: var(--font-mono); font-size: 0.6rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--color-text-muted); margin-top: 0.25rem; }

/* Modal */
.modal-backdrop { position: fixed; inset: 0; z-index: 200; background: rgba(0,0,0,0.6); backdrop-filter: blur(4px); animation: fadeIn var(--transition-normal) forwards; }
.modal-panel {
    position: fixed; z-index: 201; background: var(--color-surface); overflow-y: auto;
    animation: slideUp var(--transition-slow) forwards;
    bottom: 0; left: 0; right: 0; max-height: 92vh;
    border-radius: var(--radius-xl) var(--radius-xl) 0 0; padding: 1.25rem;
}
@media (min-width: 768px) {
    .modal-panel {
        top: 50%; left: 50%; right: auto; bottom: auto; transform: translate(-50%, -50%);
        max-width: 640px; width: 90%; max-height: 85vh; border-radius: var(--radius-lg); padding: 2rem;
        animation: fadeScaleIn var(--transition-slow) forwards;
    }
}
.modal-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1.25rem; }
.modal-header h2 { font-family: var(--font-display); font-size: 1.35rem; font-weight: 700; }
.modal-handle { width: 40px; height: 4px; border-radius: 2px; background: var(--color-border); margin: 0 auto 1rem; display: block; }
@media (min-width: 768px) { .modal-handle { display: none; } }

/* Detail View */
.detail-cover { width: 100%; max-height: 400px; object-fit: contain; border-radius: var(--radius-md); background: var(--color-card-bg); }
.detail-section { margin-top: 1.25rem; }
.detail-section h3 { font-family: var(--font-mono); font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--color-text-muted); margin-bottom: 0.5rem; }
.detail-field { display: flex; justify-content: space-between; padding: 0.4rem 0; border-bottom: 1px solid color-mix(in srgb, var(--color-border) 50%, transparent); font-size: 0.85rem; }
.detail-field .field-label { color: var(--color-text-muted); font-size: 0.8rem; }
.detail-field .field-value { text-align: right; font-weight: 500; max-width: 60%; }
.detail-tags { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-top: 0.5rem; }
.tag { padding: 0.2rem 0.5rem; font-size: 0.7rem; font-family: var(--font-mono); background: color-mix(in srgb, var(--color-primary) 12%, var(--color-surface)); border: 1px solid color-mix(in srgb, var(--color-primary) 25%, var(--color-border)); border-radius: 999px; color: var(--color-primary); }

/* Scan Area */
.scan-area { display: flex; flex-direction: column; align-items: center; gap: 1rem; padding: 2rem 1rem; }
.scan-dropzone {
    width: 100%; max-width: 400px; aspect-ratio: 3/4;
    border: 2px dashed var(--color-border); border-radius: var(--radius-lg);
    display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 1rem;
    cursor: pointer; transition: all var(--transition-normal);
    color: var(--color-text-muted); position: relative; overflow: hidden; background: var(--color-card-bg);
}
.scan-dropzone:hover { border-color: var(--color-primary); color: var(--color-primary); }
.scan-dropzone.has-image { border-style: solid; border-color: var(--color-success); }
.scan-dropzone img { width: 100%; height: 100%; object-fit: contain; position: absolute; inset: 0; }
.scan-dropzone .drop-icon { font-size: 2.5rem; }
.scan-dropzone .drop-text { font-family: var(--font-mono); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.08em; text-align: center; }
.scan-dropzone input[type="file"] { position: absolute; inset: 0; opacity: 0; cursor: pointer; }

/* Spinner */
.recognizing { display: flex; flex-direction: column; align-items: center; gap: 1rem; padding: 2rem; }
.recognizing .spinner { width: 48px; height: 48px; border: 3px solid var(--color-border); border-top-color: var(--color-primary); border-radius: 50%; animation: spin 1s linear infinite; }
.recognizing .spinner-text { font-family: var(--font-mono); font-size: 0.8rem; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 0.08em; }

/* Theme Picker */
.theme-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 0.75rem; }
.theme-card { padding: 1rem; border-radius: var(--radius-md); border: 2px solid var(--color-border); cursor: pointer; text-align: center; transition: all var(--transition-fast); }
.theme-card:hover { border-color: var(--color-text-muted); }
.theme-card.active { border-color: var(--color-primary); box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 20%, transparent); }
.theme-swatch { display: flex; gap: 4px; margin-bottom: 0.5rem; justify-content: center; }
.theme-swatch span { width: 20px; height: 20px; border-radius: 50%; border: 1px solid rgba(128,128,128,0.3); }
.theme-name { font-size: 0.8rem; font-weight: 600; }
.theme-desc { font-size: 0.65rem; color: var(--color-text-muted); margin-top: 0.15rem; }

/* View Toggle */
.view-toggle { display: flex; background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-md); overflow: hidden; }
.view-toggle button { padding: 0.4rem 0.75rem; background: none; border: none; color: var(--color-text-muted); cursor: pointer; font-size: 0.85rem; transition: all var(--transition-fast); }
.view-toggle button.active { background: var(--color-primary); color: var(--color-bg); }

/* Section Header */
.section-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1rem; gap: 0.75rem; flex-wrap: wrap; }
.section-header h1 { font-family: var(--font-display); font-size: 1.5rem; font-weight: 900; }
@media (min-width: 768px) { .section-header h1 { font-size: 2rem; } }

/* Empty */
.empty-state { text-align: center; padding: 3rem 1rem; color: var(--color-text-muted); }
.empty-state .empty-icon { font-size: 3rem; margin-bottom: 1rem; opacity: 0.4; }
.empty-state h3 { font-family: var(--font-display); font-size: 1.25rem; margin-bottom: 0.5rem; color: var(--color-text); }
.empty-state p { font-size: 0.85rem; max-width: 300px; margin: 0 auto 1.5rem; }

/* Form Grid */
.form-grid { display: grid; grid-template-columns: 1fr; gap: 0.75rem; }
@media (min-width: 500px) { .form-grid { grid-template-columns: 1fr 1fr; } .form-grid .full-width { grid-column: 1 / -1; } }

/* Confidence */
.confidence-meter { display: flex; align-items: center; gap: 0.5rem; font-size: 0.8rem; }
.confidence-bar { flex: 1; height: 6px; background: var(--color-border); border-radius: 3px; overflow: hidden; }
.confidence-fill { height: 100%; border-radius: 3px; transition: width var(--transition-slow); }

/* Alerts */
.alert { padding: 0.75rem 1rem; border-radius: var(--radius-md); font-size: 0.85rem; display: flex; align-items: center; gap: 0.5rem; margin-bottom: 1rem; }
.alert-success { background: color-mix(in srgb, var(--color-success) 15%, var(--color-surface)); border: 1px solid var(--color-success); color: var(--color-success); }
.alert-error { background: color-mix(in srgb, var(--color-error) 15%, var(--color-surface)); border: 1px solid var(--color-error); color: var(--color-error); }
.alert-info { background: color-mix(in srgb, var(--color-primary) 10%, var(--color-surface)); border: 1px solid color-mix(in srgb, var(--color-primary) 40%, var(--color-border)); color: var(--color-primary); }

/* Animations */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { transform: translateY(100%); } to { transform: translateY(0); } }
@keyframes fadeScaleIn { from { opacity: 0; transform: translate(-50%, -50%) scale(0.95); } to { opacity: 1; transform: translate(-50%, -50%) scale(1); } }
@keyframes spin { to { transform: rotate(360deg); } }

/* Utilities */
.text-muted { color: var(--color-text-muted); }
.text-primary { color: var(--color-primary); }
.text-sm { font-size: 0.8rem; }
.text-xs { font-size: 0.7rem; }
.font-mono { font-family: var(--font-mono); }
.font-display { font-family: var(--font-display); }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.gap-half { gap: 0.5rem; }
.gap-1 { gap: 1rem; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.flex-wrap { flex-wrap: wrap; }
.w-full { width: 100%; }

/* Desktop Nav */
.desktop-nav { display: none; }
@media (min-width: 768px) {
    .desktop-nav { display: flex; align-items: center; gap: 0.25rem; }
    .desktop-nav a, .desktop-nav button {
        padding: 0.4rem 0.85rem; font-size: 0.8rem; font-family: var(--font-mono);
        text-transform: uppercase; letter-spacing: 0.04em; color: var(--color-text-muted);
        text-decoration: none; background: none; border: none; cursor: pointer;
        border-radius: var(--radius-sm); transition: all var(--transition-fast);
    }
    .desktop-nav a:hover, .desktop-nav button:hover { color: var(--color-text); background: var(--color-surface-hover); }
    .desktop-nav a.active, .desktop-nav button.active { color: var(--color-primary); }
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--color-bg); }
::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 3px; }