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

:root {
    --color-bg:       #f5f5f5;
    --color-surface:  #ffffff;
    --color-text:     #1a1a1a;
    --color-muted:    #666;
    --color-primary:  #3b82f6;
    --color-primary-h:#2563eb;
    --color-danger:   #ef4444;
    --color-border:   #e5e7eb;
    --color-tag-bg:   #e0e7ff;
    --color-tag-text: #3730a3;
    --radius:         6px;
    --gap:            1rem;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
}

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Header ─────────────────────────────────────────────────── */
.site-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1.5rem;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
}
.site-header .logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
}
.site-header nav { display: flex; gap: 1rem; }

/* ── Container ──────────────────────────────────────────────── */
.container { max-width: 960px; margin: 2rem auto; padding: 0 1.5rem; }

/* ── Buttons ────────────────────────────────────────────────── */
.btn {
    display: inline-block;
    padding: 0.45rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-surface);
    color: var(--color-text);
    font-size: 0.875rem;
    cursor: pointer;
    text-decoration: none;
    line-height: 1.4;
}
.btn:hover { background: var(--color-bg); text-decoration: none; }
.btn-primary {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}
.btn-primary:hover { background: var(--color-primary-h); }
.btn-danger {
    background: var(--color-danger);
    color: #fff;
    border-color: var(--color-danger);
}
.btn-danger:hover { opacity: 0.9; }

/* ── Filters ────────────────────────────────────────────────── */
.filters { margin-bottom: 1.5rem; }
.filter-form {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
}
.filter-form input[type="text"],
.filter-form select {
    padding: 0.45rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 0.875rem;
    background: var(--color-surface);
}
.filter-form input[type="text"] { min-width: 200px; flex: 1; }
.filter-form button { composes: btn btn-primary; }
.btn-clear { font-size: 0.8rem; color: var(--color-muted); }

/* ── Table ──────────────────────────────────────────────────── */
.items-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--color-surface);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0,0,0,.06);
}
.items-table th,
.items-table td {
    padding: 0.65rem 0.85rem;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.875rem;
}
.items-table th {
    background: var(--color-bg);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--color-muted);
}
.items-table tbody tr:hover { background: #fafafa; }

/* ── Tags ───────────────────────────────────────────────────── */
.tag {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 999px;
    background: var(--color-tag-bg);
    color: var(--color-tag-text);
    font-size: 0.75rem;
    font-weight: 500;
    margin-right: 0.25rem;
}

/* ── Flags ──────────────────────────────────────────────────── */
.flag {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 500;
}
.flag-revisit   { background: #fef3c7; color: #92400e; }
.flag-completed { background: #d1fae5; color: #065f46; }

/* ── View switcher ──────────────────────────────────────────── */
.view-switcher {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    margin-bottom: 1rem;
}
.vs-btn {
    padding: 0.35rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 0.8rem;
    color: var(--color-muted);
    background: var(--color-surface);
    text-decoration: none;
    transition: background .15s, color .15s;
}
.vs-btn:hover { background: var(--color-bg); color: var(--color-text); text-decoration: none; }
.vs-active {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}
.vs-active:hover { background: var(--color-primary-h); color: #fff; }
.vs-count {
    margin-left: auto;
    font-size: 0.8rem;
    color: var(--color-muted);
}

/* ── Tiles view ─────────────────────────────────────────────── */
.tiles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1rem;
}
.tile {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    padding: 1rem;
    background: var(--color-surface);
    border-radius: var(--radius);
    box-shadow: 0 1px 3px rgba(0,0,0,.06);
    border-left: 4px solid var(--color-border);
    text-decoration: none;
    color: var(--color-text);
    transition: box-shadow .15s, transform .15s;
    position: relative;
}
.tile:hover { box-shadow: 0 4px 12px rgba(0,0,0,.1); transform: translateY(-2px); text-decoration: none; }
.tile-revisit   { border-left-color: #f59e0b; }
.tile-completed { border-left-color: #10b981; }
.tile-name { font-weight: 600; font-size: 0.95rem; }
.tile-author { color: var(--color-muted); font-size: 0.8rem; }
.tile-rating {
    position: relative;
    height: 6px;
    background: var(--color-bg);
    border-radius: 3px;
    overflow: hidden;
    margin-top: 0.25rem;
}
.rating-bar {
    position: absolute;
    left: 0; top: 0; bottom: 0;
    background: var(--color-primary);
    border-radius: 3px;
}
.rating-num {
    position: absolute;
    right: 0;
    top: -16px;
    font-size: 0.7rem;
    color: var(--color-muted);
}
.tile-tags { display: flex; flex-wrap: wrap; gap: 0.2rem; margin-top: 0.15rem; }
.tile-flag { position: absolute; top: 0.5rem; right: 0.5rem; }

/* ── Cloud view ─────────────────────────────────────────────── */
.cloud-container {
    position: relative;
    width: 100%;
    min-height: 400px;
    background: var(--color-surface);
    border-radius: var(--radius);
    box-shadow: 0 1px 3px rgba(0,0,0,.06);
    overflow: hidden;
}
.cloud-dot {
    position: absolute;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    text-align: center;
    text-decoration: none;
    color: var(--color-text);
    padding: 0.5rem;
    transition: transform .15s, box-shadow .15s;
    cursor: pointer;
    overflow: hidden;
    word-break: break-word;
}
.cloud-dot:hover { transform: scale(1.12); box-shadow: 0 4px 16px rgba(0,0,0,.15); text-decoration: none; z-index: 2; }
.dot-none      { background: #e5e7eb; }
.dot-revisit   { background: #fef3c7; }
.dot-completed { background: #d1fae5; }
.dot-label {
    font-size: inherit;
    font-weight: 600;
    line-height: 1.2;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
}

/* ── Detail page ────────────────────────────────────────────── */
.item-detail { margin-bottom: 1.5rem; }
.item-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
}
.item-header h1 { font-size: 1.5rem; }
.item-actions { display: flex; gap: 0.5rem; align-items: center; }
.inline-form { display: inline; }

.detail-grid {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 0.5rem 1rem;
    background: var(--color-surface);
    padding: 1.25rem;
    border-radius: var(--radius);
    box-shadow: 0 1px 3px rgba(0,0,0,.06);
}
.detail-grid dt { font-weight: 600; color: var(--color-muted); font-size: 0.85rem; }
.detail-grid dd { font-size: 0.9rem; }
.detail-grid .notes { white-space: pre-wrap; }

/* ── Form ───────────────────────────────────────────────────── */
.item-form {
    background: var(--color-surface);
    padding: 1.5rem;
    border-radius: var(--radius);
    box-shadow: 0 1px 3px rgba(0,0,0,.06);
    max-width: 600px;
}
.form-group { margin-bottom: 1rem; }
.form-group label {
    display: block;
    font-weight: 600;
    font-size: 0.85rem;
    margin-bottom: 0.3rem;
}
.form-group label small { font-weight: 400; color: var(--color-muted); }
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-family: inherit;
}
.form-group textarea { resize: vertical; }
.form-group.has-error input,
.form-group.has-error select {
    border-color: var(--color-danger);
}
.form-group .error {
    color: var(--color-danger);
    font-size: 0.8rem;
    margin-top: 0.2rem;
    display: block;
}
.form-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.25rem;
}

/* ── Empty state ────────────────────────────────────────────── */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--color-muted);
    font-size: 1rem;
}

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 640px) {
    .site-header { flex-direction: column; gap: 0.5rem; }
    .filter-form { flex-direction: column; }
    .filter-form input[type="text"] { min-width: auto; width: 100%; }
    .detail-grid { grid-template-columns: 1fr; }
    .item-header { flex-direction: column; }
}

/* ── Alerts ─────────────────────────────────────────────────── */
.alert {
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
    font-size: 0.9rem;
}
.alert ul { margin: 0.25rem 0 0 1.25rem; }
.alert-success { background: #d1fae5; color: #065f46; border: 1px solid #a7f3d0; }
.alert-error   { background: #fee2e2; color: #991b1b; border: 1px solid #fecaca; }

/* ── Card ───────────────────────────────────────────────────── */
.card {
    background: var(--color-surface);
    padding: 1.5rem;
    border-radius: var(--radius);
    box-shadow: 0 1px 3px rgba(0,0,0,.06);
}
.card hr { border: none; border-top: 1px solid var(--color-border); margin: 1.25rem 0; }

/* ── Upload form ────────────────────────────────────────────── */
.upload-form .form-group { margin-bottom: 1rem; }
.help-text { display: block; color: var(--color-muted); font-size: 0.8rem; margin-top: 0.3rem; }
.help-text code { background: var(--color-bg); padding: 0.1em 0.35em; border-radius: 3px; font-size: 0.8rem; }

/* ── Preview table ──────────────────────────────────────────── */
.table-wrap { overflow-x: auto; margin-top: 1rem; }
.preview-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}
.select-all-label { font-size: 0.85rem; color: var(--color-muted); cursor: pointer; margin-left: auto; }
.row-error { background: #fef2f2; }
.text-danger { color: var(--color-danger); font-size: 0.8rem; }
.text-success { color: #059669; font-size: 0.8rem; }
.badge {
    display: inline-block;
    padding: 0.1rem 0.45rem;
    border-radius: 999px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
}
.badge-create { background: #dbeafe; color: #1e40af; }
.badge-update { background: #fef3c7; color: #92400e; }