/* ============================================================
   DroidPage Editor — page-builder shell (fresh rewrite)
   Modern, responsive, light + dark. Class contract preserved
   so app.js bindings stay intact.
   ============================================================ */

/* ── Design tokens ──────────────────────────────────────── */
:root {
    --accent:        #6366f1;
    --accent-strong: #4f46e5;
    --accent-soft:   rgba(99, 102, 241, 0.12);
    --danger:        #ef4444;
    --danger-soft:   rgba(239, 68, 68, 0.12);
    --ok:            #22c55e;

    --bg:            #eef1f6;
    --surface:       #ffffff;
    --surface-2:     #f7f8fb;
    --surface-3:     #eff1f6;
    --toolbar:       #ffffff;
    --canvas:        #e7eaf1;

    --text:          #1e293b;
    --text-soft:     #64748b;
    --text-faint:    #94a3b8;
    --line:          #e3e7ee;
    --line-strong:   #d3d9e3;

    --radius-sm: 8px;
    --radius:    12px;
    --radius-lg: 18px;

    --shadow-1: 0 1px 2px rgba(15, 23, 42, 0.06);
    --shadow-2: 0 4px 14px rgba(15, 23, 42, 0.08);
    --shadow-3: 0 18px 50px rgba(15, 23, 42, 0.18);

    --rail: 56px;
    --toolbar-h: 60px;

    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

body.dark-theme {
    --bg:        #0b0f17;
    --surface:   #141a24;
    --surface-2: #1a212d;
    --surface-3: #212a38;
    --toolbar:   #111722;
    --canvas:    #0d1119;

    --text:        #e6eaf2;
    --text-soft:   #97a3b6;
    --text-faint:  #64748b;
    --line:        #283142;
    --line-strong: #364154;
    --accent-soft: rgba(99, 102, 241, 0.2);
    --shadow-3: 0 18px 50px rgba(0, 0, 0, 0.55);
}

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

html { -webkit-text-size-adjust: 100%; }

body {
    font-family: var(--font);
    font-size: 15px;
    line-height: 1.5;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    height: 100vh;
    overflow: hidden;
    transition: background 0.3s var(--ease), color 0.3s var(--ease);
}

img, svg, video { display: block; max-width: 100%; }
button { font-family: inherit; cursor: pointer; }
input, textarea, select { font-family: inherit; }
.hidden { display: none !important; }

/* ── Buttons ────────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    height: 38px;
    padding: 0 14px;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: var(--surface);
    color: var(--text);
    font-size: 0.86rem;
    font-weight: 600;
    white-space: nowrap;
    transition: background 0.16s var(--ease), border-color 0.16s var(--ease),
                color 0.16s var(--ease), transform 0.1s var(--ease), box-shadow 0.16s var(--ease);
}
.btn:hover { background: var(--surface-2); border-color: var(--line-strong); }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn svg { width: 18px; height: 18px; }

.btn-primary {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
    box-shadow: 0 2px 10px var(--accent-soft);
}
.btn-primary:hover { background: var(--accent-strong); border-color: var(--accent-strong); }

.btn-secondary {
    width: 38px;
    padding: 0;
    color: var(--text-soft);
}
.btn-secondary:hover { color: var(--text); }

.btn-danger { width: 38px; padding: 0; color: var(--danger); }
.btn-danger:hover { background: var(--danger-soft); border-color: var(--danger); }

/* ── Loader ─────────────────────────────────────────────── */
.app-loader {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: grid;
    place-items: center;
    background: var(--bg);
    transition: opacity 0.4s var(--ease), visibility 0.4s var(--ease);
}
.app-loader.hidden { opacity: 0; visibility: hidden; display: grid !important; pointer-events: none; }
.loader-container { display: grid; justify-items: center; gap: 18px; }
.loader-spinner {
    width: 42px; height: 42px;
    border: 3px solid var(--line);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loader-log { color: var(--text-soft); font-size: 0.88rem; min-height: 1.2em; }

/* ── App header / toolbar ───────────────────────────────── */
.app-header {
    height: var(--toolbar-h);
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 0 16px;
    background: var(--toolbar);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-1);
    z-index: 50;
}
.logo-wrapper { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.logo {
    display: flex; align-items: center; gap: 9px;
    text-decoration: none; color: var(--text);
    font-weight: 700; font-size: 1rem; letter-spacing: -0.01em;
}
.logo-icon { width: 26px; height: 26px; border-radius: 7px; }

.header-toggle-btn {
    display: grid; place-items: center;
    width: 38px; height: 38px;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: var(--surface);
    color: var(--text-soft);
    transition: background 0.16s var(--ease), color 0.16s var(--ease);
}
.header-toggle-btn:hover { background: var(--surface-2); color: var(--text); }
.header-toggle-btn .icon-open { display: none; }
.header-toggle-btn.collapsed .icon-open { display: block; }
.header-toggle-btn.collapsed .icon-close { display: none; }

.actions {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-left: auto;
    flex-wrap: nowrap;
    min-width: 0;
}
.action-group { display: flex; align-items: center; gap: 7px; }
.action-group::after {
    content: "";
    width: 1px; height: 24px;
    background: var(--line);
    margin: 0 2px;
}
.action-group:last-child::after { display: none; }

/* Segmented view switch */
.view-switches {
    display: flex;
    gap: 2px;
    padding: 3px;
    background: var(--surface-3);
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
}
.view-switches button {
    display: grid; place-items: center;
    width: 34px; height: 30px;
    border: none; border-radius: 6px;
    background: transparent;
    color: var(--text-soft);
    transition: background 0.16s var(--ease), color 0.16s var(--ease), box-shadow 0.16s var(--ease);
}
.view-switches button svg { width: 17px; height: 17px; }
.view-switches button:hover { color: var(--text); }
.view-switches button.active {
    background: var(--surface);
    color: var(--accent);
    box-shadow: var(--shadow-1);
}

.save-indicator {
    display: inline-flex; align-items: center; gap: 6px;
    height: 38px; padding: 0 10px;
    border-radius: var(--radius-sm);
    color: var(--text-faint);
    font-size: 0.8rem; font-weight: 600;
    transition: color 0.2s var(--ease), background 0.2s var(--ease);
}
.save-indicator svg { width: 15px; height: 15px; }
.save-indicator.is-saving { color: var(--ok); background: rgba(34, 197, 94, 0.12); }

/* ── Builder layout ─────────────────────────────────────── */
.builder-container {
    display: grid;
    grid-template-columns: 380px 1fr;
    height: calc(100vh - var(--toolbar-h));
    overflow: hidden;
}
body.sidebar-pre-init .builder-container { visibility: hidden; }

/* ── Sidebar ────────────────────────────────────────────── */
.sidebar {
    position: relative;
    height: 100%;
    overflow-y: auto;
    overflow-x: hidden;
    background: var(--surface);
    border-right: 1px solid var(--line);
    padding: 14px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    scrollbar-width: thin;
    scrollbar-color: var(--line-strong) transparent;
}
.sidebar::-webkit-scrollbar { width: 9px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--line-strong); border-radius: 9px; border: 3px solid var(--surface); }
.sidebar.is-collapsed { padding: 0; }
.sidebar.is-collapsed > * { display: none; }

/* Collapsible section cards */
.sidebar > section {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-1);
}
.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 14px 16px;
    cursor: pointer;
    user-select: none;
    position: relative;
    transition: background 0.16s var(--ease);
}
.section-header::before {
    content: "";
    position: absolute; left: 0; top: 12px; bottom: 12px;
    width: 3px; border-radius: 0 3px 3px 0;
    background: var(--accent);
    opacity: 0;
    transition: opacity 0.16s var(--ease);
}
.section-header:hover { background: var(--surface-2); }
.section-header:hover::before { opacity: 1; }
.section-header h3 { font-size: 0.92rem; font-weight: 700; letter-spacing: -0.01em; }
.section-chevron {
    width: 18px; height: 18px;
    color: var(--text-faint);
    transition: transform 0.22s var(--ease);
    flex-shrink: 0;
}
.sidebar > section.collapsed .section-chevron { transform: rotate(-90deg); }

.section-body {
    padding: 4px 16px 18px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}
.sidebar > section.collapsed .section-body { display: none; }

.theme-colors-section { display: none; }
.theme-colors-section.visible { display: block; }

.section-copy { font-size: 0.8rem; color: var(--text-soft); line-height: 1.5; }
.subsection-title {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-faint);
    padding-top: 6px;
    border-top: 1px dashed var(--line);
    margin-top: 2px;
}
.section-actions { display: flex; gap: 8px; }
.section-action-btn { width: 100%; height: 36px; }
.nav-editor-actions { margin-top: 2px; }

/* ── Theme grid ─────────────────────────────────────────── */
.theme-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}
.theme-card {
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    overflow: hidden;
    cursor: pointer;
    background: var(--surface-2);
    transition: border-color 0.16s var(--ease), transform 0.16s var(--ease), box-shadow 0.16s var(--ease);
}
.theme-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-2); }
.theme-card img { width: 100%; height: 88px; object-fit: cover; background: var(--surface-3); }
.theme-card .theme-name {
    padding: 8px 10px;
    font-size: 0.8rem;
    font-weight: 600;
    border-top: 1px solid var(--line);
}
.theme-card.active { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-soft); }
.theme-card.active .theme-name { color: var(--accent); }
.theme-skeleton {
    height: 122px;
    border-radius: var(--radius-sm);
    background: linear-gradient(100deg, var(--surface-2) 30%, var(--surface-3) 50%, var(--surface-2) 70%);
    background-size: 200% 100%;
    animation: shimmer 1.3s infinite;
}
@keyframes shimmer { to { background-position: -200% 0; } }

/* ── Form fields ────────────────────────────────────────── */
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group > label {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-soft);
}
.full-width { width: 100%; }

input[type="text"],
input[type="url"],
input[type="number"],
input[type="email"],
textarea,
select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-sm);
    background: var(--surface-2);
    color: var(--text);
    font-size: 0.86rem;
    transition: border-color 0.16s var(--ease), box-shadow 0.16s var(--ease), background 0.16s var(--ease);
}
textarea { resize: vertical; min-height: 60px; line-height: 1.5; }
select { cursor: pointer; appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-repeat: no-repeat; background-position: right 10px center; padding-right: 34px;
}
input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--accent);
    background: var(--surface);
    box-shadow: 0 0 0 3px var(--accent-soft);
}
input::placeholder, textarea::placeholder { color: var(--text-faint); }

.link-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }

/* Range row */
.range-input-row { display: flex; align-items: center; gap: 12px; }
.range-input-row input[type="range"] {
    flex: 1;
    -webkit-appearance: none; appearance: none;
    height: 5px; border-radius: 5px;
    background: var(--line-strong);
}
.range-input-row input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none; appearance: none;
    width: 17px; height: 17px; border-radius: 50%;
    background: var(--accent); border: 2px solid var(--surface);
    box-shadow: var(--shadow-1); cursor: pointer;
}
.range-input-row input[type="range"]::-moz-range-thumb {
    width: 15px; height: 15px; border-radius: 50%;
    background: var(--accent); border: 2px solid var(--surface); cursor: pointer;
}
.range-input-row input[type="number"] { width: 64px; flex-shrink: 0; padding: 8px; text-align: center; }

/* Field with inline checkbox toggle */
.field-with-toggle { display: flex; align-items: stretch; gap: 8px; }
.field-with-toggle > input,
.field-with-toggle > textarea { flex: 1; }
.field-with-toggle-area { align-items: flex-start; }
.inline-check { display: flex; align-items: center; padding-top: 9px; }

/* Toggles / checkboxes */
input[type="checkbox"] {
    appearance: none; -webkit-appearance: none;
    width: 38px; height: 22px;
    border-radius: 22px;
    background: var(--line-strong);
    position: relative;
    cursor: pointer;
    flex-shrink: 0;
    transition: background 0.2s var(--ease);
}
input[type="checkbox"]::after {
    content: "";
    position: absolute; top: 2px; left: 2px;
    width: 18px; height: 18px; border-radius: 50%;
    background: #fff;
    box-shadow: var(--shadow-1);
    transition: transform 0.2s var(--ease);
}
input[type="checkbox"]:checked { background: var(--accent); }
input[type="checkbox"]:checked::after { transform: translateX(16px); }

.toggle-row { display: flex; }
.toggle-control { display: flex; align-items: center; gap: 10px; cursor: pointer; font-size: 0.86rem; font-weight: 500; }

/* ── Image upload ───────────────────────────────────────── */
.image-upload {
    position: relative;
    display: grid;
    place-items: center;
    min-height: 96px;
    padding: 14px;
    border: 1.5px dashed var(--line-strong);
    border-radius: var(--radius);
    background: var(--surface-2);
    cursor: pointer;
    text-align: center;
    transition: border-color 0.16s var(--ease), background 0.16s var(--ease);
}
.image-upload:hover { border-color: var(--accent); background: var(--accent-soft); }
.upload-placeholder, .upload-placeholder-small {
    display: grid; justify-items: center; gap: 8px;
    color: var(--text-faint); font-size: 0.8rem; font-weight: 500;
}
.upload-placeholder svg { color: var(--text-soft); }
.image-preview { max-height: 120px; border-radius: var(--radius-sm); object-fit: contain; }
.image-clear-btn {
    position: absolute; top: 8px; right: 8px;
    width: 28px; height: 28px;
    display: grid; place-items: center;
    border: 1px solid var(--line); border-radius: 7px;
    background: var(--surface); color: var(--danger);
    box-shadow: var(--shadow-1);
}
.image-clear-btn:hover { background: var(--danger-soft); border-color: var(--danger); }
.image-clear-btn svg { width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

/* ── Color var pickers ──────────────────────────────────── */
.color-vars-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.color-var-item { display: flex; flex-direction: column; gap: 6px; }
.color-var-item > label { font-size: 0.76rem; font-weight: 600; color: var(--text-soft); }
.color-var-swatch {
    display: flex; align-items: center; gap: 8px;
    padding: 7px 9px;
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-sm);
    background: var(--surface-2);
    cursor: pointer;
    transition: border-color 0.16s var(--ease), box-shadow 0.16s var(--ease);
}
.color-var-swatch:hover { border-color: var(--accent); }
.color-var-swatch.is-open { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.color-swatch-preview { width: 22px; height: 22px; border-radius: 6px; border: 1px solid rgba(0,0,0,0.1); flex-shrink: 0; }
.color-swatch-hex { font-size: 0.74rem; font-weight: 600; font-family: var(--font); letter-spacing: 0.02em; text-transform: uppercase; color: var(--text-soft); }

.color-picker-popover {
    position: fixed;
    z-index: 200;
    width: 260px;
    display: none;
    flex-direction: column;
    gap: 10px;
    padding: 14px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow-3);
}
.color-var-swatch.is-open .color-picker-popover { display: flex; }
.color-picker-popover-label { font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-faint); }
.color-picker-popover input[type="text"] { text-transform: uppercase; }
.color-picker-suggestions { display: grid; grid-template-columns: repeat(6, 1fr); gap: 6px; }
.color-picker-chip { width: 100%; aspect-ratio: 1; border-radius: 6px; border: 1px solid rgba(0,0,0,0.12); transition: transform 0.12s var(--ease); }
.color-picker-chip:hover { transform: scale(1.12); }
.color-picker-note { font-size: 0.72rem; color: var(--text-faint); }

/* ── Nav / feature item cards ───────────────────────────── */
.nav-items-editor, .features-editor { display: flex; flex-direction: column; gap: 8px; }
.nav-item-card {
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: var(--surface-2);
    overflow: hidden;
    transition: box-shadow 0.16s var(--ease), border-color 0.16s var(--ease), opacity 0.16s var(--ease);
}
.nav-item-card:hover { border-color: var(--line-strong); }
.nav-item-card.dragging { opacity: 0.5; box-shadow: var(--shadow-2); }
.nav-item-header {
    display: flex; align-items: center; gap: 8px;
    padding: 9px 10px;
    cursor: pointer;
}
.nav-item-handle, .screenshot-handle {
    display: grid; place-items: center;
    width: 24px; height: 24px;
    border: none; background: transparent;
    color: var(--text-faint);
    cursor: grab; flex-shrink: 0;
}
.nav-item-handle:active, .screenshot-handle:active { cursor: grabbing; }
.nav-item-handle svg, .screenshot-handle svg { width: 18px; height: 18px; fill: currentColor; }
.nav-item-title { display: flex; flex-direction: column; gap: 1px; min-width: 0; flex: 1; }
.nav-item-label { font-size: 0.84rem; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.nav-item-url { font-size: 0.72rem; color: var(--text-faint); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.feature-item-icon { display: inline-grid; place-items: center; width: 26px; height: 26px; border-radius: 7px; background: var(--accent-soft); color: var(--accent); flex-shrink: 0; }
.feature-item-icon-svg { width: 16px; height: 16px; }
.nav-item-title .feature-item-icon { margin-right: 2px; }

.nav-item-toggle, .nav-item-remove, .screenshot-remove {
    display: grid; place-items: center;
    width: 26px; height: 26px;
    border: none; border-radius: 6px;
    background: transparent;
    color: var(--text-faint);
    flex-shrink: 0;
    transition: background 0.16s var(--ease), color 0.16s var(--ease);
}
.nav-item-toggle svg, .nav-item-remove svg, .screenshot-remove svg {
    width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
}
.nav-item-toggle:hover { background: var(--surface-3); color: var(--text); }
.nav-item-toggle svg { transition: transform 0.22s var(--ease); }
.nav-item-card.collapsed .nav-item-toggle svg { transform: rotate(-90deg); }
.nav-item-remove:hover, .screenshot-remove:hover { background: var(--danger-soft); color: var(--danger); }

.nav-item-body {
    display: flex; flex-direction: column; gap: 10px;
    padding: 4px 12px 14px;
    border-top: 1px solid var(--line);
}
.nav-item-card.collapsed .nav-item-body { display: none; }
.nav-item-body .form-group > label { font-size: 0.72rem; }

/* Feature icon select shows nicely */
.nav-item-card.feature-card { background: var(--surface-2); }

/* ── Screenshots editor ─────────────────────────────────── */
.screenshots-editor, .screenshots-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}
.screenshot-card {
    position: relative;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: var(--surface-2);
    padding: 6px;
    transition: opacity 0.16s var(--ease), box-shadow 0.16s var(--ease);
}
.screenshot-card.dragging { opacity: 0.5; box-shadow: var(--shadow-2); }
.screenshot-handle { position: absolute; top: 8px; left: 8px; z-index: 2; width: 22px; height: 22px; background: rgba(0,0,0,0.45); border-radius: 5px; color: #fff; }
.screenshot-handle svg { width: 15px; height: 15px; }
.screenshot-thumb {
    position: relative;
    aspect-ratio: 9/16;
    border-radius: 6px;
    overflow: hidden;
    background: var(--surface-3);
    cursor: pointer;
    display: grid;
    place-items: center;
}
.screenshot-thumb img { width: 100%; height: 100%; object-fit: cover; }
.screenshot-thumb.is-empty { border: 1.5px dashed var(--line-strong); }
.screenshot-thumb.is-empty span { font-size: 1.1rem; font-weight: 700; color: var(--text-faint); }
.screenshot-thumb:hover { outline: 2px solid var(--accent); outline-offset: -2px; }
.screenshot-remove { position: absolute; top: 8px; right: 8px; z-index: 2; width: 22px; height: 22px; background: rgba(0,0,0,0.45); color: #fff; }
.screenshot-remove:hover { background: var(--danger); color: #fff; }

/* ── Preview area / canvas ──────────────────────────────── */
.preview-area {
    position: relative;
    display: flex;
    align-items: stretch;
    justify-content: center;
    height: 100%;
    background: var(--canvas);
    background-image: radial-gradient(circle, rgba(120,130,150,0.18) 1px, transparent 1px);
    background-size: 22px 22px;
    overflow: hidden;
}
.resizer {
    width: 8px;
    flex-shrink: 0;
    cursor: col-resize;
    display: grid;
    place-items: center;
    background: transparent;
    z-index: 5;
}
.resizer-handle {
    display: grid;
    grid-template-columns: repeat(2, 3px);
    gap: 3px;
    padding: 8px 4px;
    border-radius: 6px;
    background: var(--surface);
    border: 1px solid var(--line);
    box-shadow: var(--shadow-1);
    opacity: 0;
    transition: opacity 0.16s var(--ease);
}
.resizer:hover .resizer-handle, body.resizing .resizer-handle { opacity: 1; }
.resizer-handle span { width: 3px; height: 3px; border-radius: 50%; background: var(--text-faint); }

.preview-iframe-wrapper {
    position: relative;
    flex: 1;
    height: 100%;
    display: flex;
    background: #fff;
    transition: width 0.05s linear;
}
#preview-frame {
    width: 100%;
    height: 100%;
    border: none;
    background: #fff;
}

/* Mobile preview mode = phone frame */
.preview-area.mobile {
    padding: 24px 0;
    align-items: center;
}
.preview-area.mobile .preview-iframe-wrapper {
    flex: none;
    width: 375px;
    height: calc(100% - 48px);
    max-height: 860px;
    border-radius: 30px;
    border: 9px solid #11161f;
    box-shadow: var(--shadow-3);
    overflow: hidden;
}
.preview-area.mobile #preview-frame { border-radius: 20px; }
.preview-area.mobile .resizer { display: none; }

.mobile-resizer {
    position: absolute;
    top: 0; right: -9px;
    width: 9px; height: 100%;
    display: none;
    cursor: col-resize;
    align-items: center;
    justify-content: center;
    z-index: 6;
}
.preview-area.mobile .mobile-resizer { display: flex; }
.mobile-resizer .resizer-handle { opacity: 0.7; transform: scale(0.85); }
.mobile-resizer:hover .resizer-handle { opacity: 1; }

body.resizing { cursor: col-resize; user-select: none; }
body.resizing iframe { pointer-events: none; }

/* Theme toggle icon swap */
.theme-icon-dark { display: none; }
body.dark-theme .theme-icon-light { display: none; }
body.dark-theme .theme-icon-dark { display: block; }

/* ── Mobile sidebar backdrop ────────────────────────────── */
.sidebar-backdrop {
    position: fixed;
    inset: var(--toolbar-h) 0 0 0;
    background: rgba(15, 23, 42, 0.45);
    backdrop-filter: blur(2px);
    z-index: 39;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s var(--ease), visibility 0.25s var(--ease);
}

/* ============================================================
   Responsive — tablet & mobile (drawer sidebar)
   Overrides app.js inline grid via !important.
   ============================================================ */
@media (max-width: 1024px) {
    .builder-container { grid-template-columns: 1fr !important; }

    .sidebar {
        position: fixed;
        top: var(--toolbar-h);
        left: 0;
        bottom: 0;
        width: min(400px, 86vw);
        z-index: 40;
        box-shadow: var(--shadow-3);
        transform: translateX(0);
        transition: transform 0.28s var(--ease);
    }
    .sidebar.is-collapsed {
        transform: translateX(-100%);
        padding: 14px;
    }
    .sidebar.is-collapsed > * { display: block; }

    .sidebar:not(.is-collapsed) ~ .sidebar-backdrop,
    body:has(.sidebar:not(.is-collapsed)) .sidebar-backdrop { opacity: 1; visibility: visible; }

    .resizer { display: none; }
    .preview-area { width: 100%; }
}

@media (max-width: 720px) {
    .app-header { gap: 10px; padding: 0 12px; }
    .logo span { display: none; }
    .actions { gap: 8px; }
    .action-group::after { display: none; }
    .action-group { gap: 5px; }
    /* keep only essential controls visible on small screens */
    #import-btn, #export-json-btn, .save-indicator span.save-indicator-text { display: none; }
    .save-indicator { padding: 0 6px; }
    .sidebar { width: 90vw; }
}

@media (max-width: 480px) {
    .color-vars-grid, .link-grid { grid-template-columns: 1fr; }
    .screenshots-editor, .screenshots-row { grid-template-columns: repeat(2, 1fr); }
    .preview-area.mobile .preview-iframe-wrapper { width: 92%; }
    #theme-toggle, .actions a[title="View Source on GitHub"] { display: none; }
}