:root {
    --bg: #0f1218;
    --panel-bg: #1a1f29;
    --border: #2a3040;
    --text: #e6e9ef;
    --muted: #93a0b4;
    --accent: #4f8cff;
    --danger: #e2544a;
    --row-height: 110px; /* must match ROW_PX in grid.js */
    --grid-gap: 10px; /* must match GRID_GAP in grid.js */
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font: 15px/1.4 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

a { color: var(--accent); }

.topbar {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 10px 20px;
    border-bottom: 1px solid var(--border);
    background: var(--panel-bg);
}
.topbar-brand { font-weight: 700; }
.topbar-pages { display: flex; gap: 8px; align-items: center; flex: 1; overflow-x: auto; }
.topbar-page-link {
    padding: 6px 12px;
    border-radius: 6px;
    text-decoration: none;
    color: var(--text);
    white-space: nowrap;
}
.topbar-page-link:hover { background: var(--border); }
.topbar-new-page {
    border: 1px dashed var(--border);
    background: none;
    color: var(--muted);
    border-radius: 6px;
    width: 28px; height: 28px;
    cursor: pointer;
}
.topbar-user { display: flex; gap: 14px; align-items: center; color: var(--muted); }
.link-btn { background: none; border: none; color: var(--accent); cursor: pointer; padding: 0; font: inherit; }

.app-main { padding: 20px; }

.centered-card {
    max-width: 380px;
    margin: 10vh auto 0;
    background: var(--panel-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 28px;
    text-align: center;
}
.stacked-form { display: flex; flex-direction: column; gap: 12px; text-align: left; margin-top: 16px; }
.stacked-form label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); }
.stacked-form input, .stacked-form select {
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 8px 10px;
    border-radius: 6px;
    font: inherit;
}
.stacked-form button {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 10px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
}
.checkbox-label { flex-direction: row !important; align-items: center; gap: 8px !important; }
.error { color: var(--danger); }
.success { color: #3fca6d; }
.hint { color: var(--muted); font-size: 13px; }

/* --- page toolbar --- */
.page-toolbar { display: flex; align-items: center; gap: 16px; margin-bottom: 16px; }
.page-title { margin: 0; cursor: default; }
.lock-toggle {
    background: var(--panel-bg);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 6px 14px;
    border-radius: 6px;
    cursor: pointer;
}

/* --- grid --- */
.panel-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    grid-auto-rows: var(--row-height);
    gap: var(--grid-gap);
    min-height: calc(var(--row-height) * 4);
    position: relative;
}
.panel-grid[data-locked="0"] {
    background-image: linear-gradient(var(--border) 1px, transparent 1px), linear-gradient(90deg, var(--border) 1px, transparent 1px);
    /* Each tile must span one column/row *plus* the gap that follows it,
       or these guide lines drift away from the real cell boundaries the
       further right/down they go (grid-template-columns: 1fr already
       accounts for `gap`; a naive 100%/12 tile does not). */
    background-size: calc((100% + var(--grid-gap)) / 12) calc(var(--row-height) + var(--grid-gap));
}
.panel {
    background: var(--panel-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
}
.panel.dragging { opacity: 0.85; z-index: 10; box-shadow: 0 6px 24px rgba(0,0,0,.4); }
.panel.resizing { z-index: 10; box-shadow: 0 6px 24px rgba(0,0,0,.4); }
.panel.shake { animation: shake .3s; }
@keyframes shake { 25% { transform: translateX(-4px); } 75% { transform: translateX(4px); } }
.panel-resize-handle {
    display: none;
    position: absolute;
    right: 0;
    bottom: 0;
    width: 16px;
    height: 16px;
    cursor: nwse-resize;
}
.panel-resize-handle::after {
    content: '';
    position: absolute;
    right: 3px;
    bottom: 3px;
    width: 8px;
    height: 8px;
    border-right: 2px solid var(--muted);
    border-bottom: 2px solid var(--muted);
}
.panel-grid[data-locked="0"] .panel-resize-handle { display: block; }
.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 10px;
    border-bottom: 1px solid var(--border);
    font-size: 13px;
    color: var(--muted);
}
.panel-grid[data-locked="0"] .panel-header { cursor: grab; }
.panel-remove {
    display: none;
    background: none;
    border: none;
    color: var(--muted);
    font-size: 16px;
    line-height: 1;
    cursor: pointer;
}
.panel-grid[data-locked="0"] .panel-remove { display: block; }
.panel-remove:hover { color: var(--danger); }
.panel-body { flex: 1; overflow: auto; padding: 10px; }
.panel-error { color: var(--danger); font-size: 13px; }

/* --- modal --- */
.modal-overlay {
    position: fixed; inset: 0;
    background: rgba(0,0,0,.6);
    display: flex; align-items: center; justify-content: center;
    z-index: 100;
}
/* Needed because [hidden] and .modal-overlay have equal specificity — without
   this, the class rule's `display: flex` wins the cascade and the `hidden`
   attribute is silently ignored, leaving both modals visible on page load. */
.modal-overlay[hidden] { display: none; }
.modal {
    background: var(--panel-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 24px;
    max-width: 480px;
    width: 90%;
    max-height: 80vh;
    overflow: auto;
    position: relative;
}
.modal-small { max-width: 340px; text-align: center; }
.modal-close { position: absolute; top: 10px; right: 14px; background: none; border: none; color: var(--muted); font-size: 20px; cursor: pointer; }
.modal-actions { display: flex; gap: 10px; justify-content: center; margin-top: 16px; }
.danger-btn { background: var(--danger); color: #fff; border: none; padding: 8px 16px; border-radius: 6px; cursor: pointer; }

.panel-type-list { display: flex; flex-direction: column; gap: 8px; margin-top: 12px; }
.panel-type-choice {
    display: grid;
    grid-template-columns: 32px 1fr;
    gap: 4px 10px;
    text-align: left;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 10px 12px;
    color: var(--text);
    cursor: pointer;
}
.pt-icon { grid-row: span 2; font-size: 20px; }
.pt-desc { grid-column: 2; color: var(--muted); font-size: 12px; }
.cred-choice { display: flex; align-items: center; gap: 10px; margin: 8px 0; }
.cred-choice select { background: var(--bg); color: var(--text); border: 1px solid var(--border); border-radius: 6px; }

/* --- admin --- */
.admin-users-table { width: 100%; border-collapse: collapse; margin: 16px 0; }
.admin-users-table th, .admin-users-table td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); }
.invite-link-box { background: var(--panel-bg); border: 1px solid var(--accent); border-radius: 8px; padding: 12px 16px; margin: 16px 0; }
.invite-link-box code { display: block; margin-top: 6px; word-break: break-all; }