/* ===================================================================
   Grain & Glow Studio v7.1  —  Mobile-First Redesign
   © 2026 Stephanie Adams. All Rights Reserved.
   =================================================================== */

:root {
    --bg-deep:    #07090c;
    --bg-base:    #0b0d12;
    --bg-panel:   #0f1219;
    --bg-card:    #141820;
    --bg-input:   #080b11;
    --accent:     #ff4444;
    --accent-dim: rgba(255,68,68,0.14);
    --accent-glow:0 0 24px rgba(255,68,68,0.35);
    --amber:      #ffaa00;
    --amber-dim:  rgba(255,170,0,0.14);
    --green:      #00e676;
    --green-dim:  rgba(0,230,118,0.14);
    --blue:       #4a9eff;
    --blue-dim:   rgba(74,158,255,0.14);
    --purple:     #c084fc;
    --purple-dim: rgba(192,132,252,0.14);
    --cyan:       #22d3ee;
    --cyan-dim:   rgba(34,211,238,0.14);
    --text-main:  #eef0f4;
    --text-mid:   #8892a4;
    --text-muted: #454d5e;
    --border:     #181e2c;
    --border-hi:  #22293a;
    --radius:     12px;
    --radius-sm:  8px;
    --font-ui:    'DM Sans', sans-serif;
    --font-mono:  'Space Mono', monospace;
    --tab-h:      62px;
    --nav-h:      52px;
    --safe-bot:   env(safe-area-inset-bottom, 0px);
    --safe-top:   env(safe-area-inset-top, 0px);
    --transition: 0.18s ease;
}

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

html, body {
    height: 100%;
    overscroll-behavior: none;
}

body {
    background: var(--bg-deep);
    color: var(--text-main);
    font-family: var(--font-ui);
    display: flex;
    flex-direction: column;
    overflow: hidden;        /* no body scroll — each zone handles its own */
    height: 100dvh;
}

/* ── SCROLLBAR ────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 3px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #2a3040; border-radius: 2px; }

/* ══════════════════════════════════════════════════════════════════
   TOP NAV BAR  —  logo + import + camera only
══════════════════════════════════════════════════════════════════ */
nav {
    height: var(--nav-h);
    padding-top: var(--safe-top);
    background: var(--bg-panel);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-left: 14px;
    padding-right: 14px;
    gap: 10px;
    flex-shrink: 0;
    position: relative;
    z-index: 20;
}
nav::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, var(--accent) 40%, transparent 100%);
    opacity: 0.3;
}

.nav-logo {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: 0.06em;
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
    flex-shrink: 1;
    min-width: 0;
    overflow: hidden;
}
.nav-logo-icon {
    width: 20px; height: 20px;
    flex-shrink: 0;
}
.nav-logo-icon svg { width: 100%; height: 100%; }
.nav-version {
    color: var(--text-muted);
    font-size: 0.6rem;
    font-weight: 400;
}

/* Animated laser beam in logo */
.laser-beam {
    animation: laserSweep 2.8s ease-in-out infinite;
    transform-origin: left center;
}
@keyframes laserSweep {
    0%, 100% { opacity: 0.9; transform: rotate(0deg); }
    50%       { opacity: 0.3; transform: rotate(7deg); }
}
.logo-pulse {
    animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
    0%, 100% { opacity: 1; r: 1px; }
    50%       { opacity: 0.3; r: 0.5px; }
}

.nav-actions {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-shrink: 0;
}

/* ── Import button ────────────────────────────────────────────────── */
label.btn-import {
    display: flex;
    align-items: center;
    gap: 6px;
    font-family: var(--font-ui);
    font-size: 0.8rem;
    font-weight: 600;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    padding: 8px 14px;
    cursor: pointer;
    white-space: nowrap;
    transition: background var(--transition), box-shadow var(--transition);
    letter-spacing: 0.02em;
    box-shadow: 0 2px 10px rgba(255,68,68,0.3);
}
label.btn-import:active {
    background: #cc2222;
    transform: scale(0.97);
}
input[type="file"] { display: none; }

/* ── Camera button ────────────────────────────────────────────────── */
button.btn-cam {
    width: 36px; height: 36px;
    background: var(--bg-card);
    border: 1px solid var(--border-hi);
    border-radius: var(--radius-sm);
    color: var(--cyan);
    font-size: 1.05rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition);
    flex-shrink: 0;
}
button.btn-cam:active {
    background: var(--cyan-dim);
    border-color: var(--cyan);
}

/* ══════════════════════════════════════════════════════════════════
   WORKSPACE  —  preview fills all space between nav and tab bar
══════════════════════════════════════════════════════════════════ */
.workspace {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
    min-height: 0;
}

/* ── PREVIEW AREA ─────────────────────────────────────────────────── */
.preview-container {
    flex: 1;
    position: relative;
    background: #05070c;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    touch-action: none;
    min-height: 0;
}

/* Subtle animated grid */
.preview-container::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,68,68,0.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,68,68,0.025) 1px, transparent 1px);
    background-size: 28px 28px;
    pointer-events: none;
    animation: gridDrift 24s linear infinite;
    z-index: 0;
}
@keyframes gridDrift {
    0%   { background-position: 0 0; }
    100% { background-position: 28px 28px; }
}

/* Red ambient glow at bottom */
.preview-container::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 55% 35% at 50% 105%, rgba(255,68,68,0.07) 0%, transparent 65%);
    pointer-events: none;
    z-index: 0;
}

#previewCanvas {
    transform-origin: center center;
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    position: relative;
    z-index: 1;
    border-radius: 2px;
    box-shadow: 0 0 50px rgba(0,0,0,0.9), 0 0 20px rgba(255,68,68,0.08);
}

/* ── DROP HINT ────────────────────────────────────────────────────── */
.drop-hint {
    position: absolute;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: var(--text-muted);
    pointer-events: none;
    z-index: 2;
    text-align: center;
    padding: 20px;
}
.drop-hint svg { width: 52px; height: 52px; opacity: 0.18; }
.drop-hint-title {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.16em;
    color: #2e3545;
}
.drop-hint-sub {
    font-size: 0.68rem;
    color: #232a38;
    letter-spacing: 0.06em;
}
.drop-hint.hidden { display: none; }

/* ── LOADER ───────────────────────────────────────────────────────── */
.loader {
    position: absolute;
    inset: 0;
    background: rgba(7,9,12,0.88);
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    z-index: 10;
}
.loader.visible { display: flex; }
.loader-ring {
    width: 40px; height: 40px;
    border: 2px solid var(--border-hi);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loader-text {
    font-family: var(--font-mono);
    font-size: 0.62rem;
    letter-spacing: 0.18em;
    color: var(--accent);
}
.progress-bar-track {
    width: 140px; height: 2px;
    background: var(--border-hi);
    border-radius: 1px;
    overflow: hidden;
}
.progress-bar-fill {
    height: 100%;
    background: var(--accent);
    transition: width 0.2s ease;
    border-radius: 1px;
}
.progress-label {
    font-family: var(--font-mono);
    font-size: 0.58rem;
    color: var(--text-muted);
    letter-spacing: 0.08em;
    min-height: 14px;
}
.processing-note {
    font-family: var(--font-mono);
    font-size: 0.55rem;
    color: #2e3545;
    text-align: center;
    letter-spacing: 0.06em;
    max-width: 200px;
    line-height: 1.5;
}

/* ── IMAGE STATS ──────────────────────────────────────────────────── */
.img-stats {
    position: absolute;
    top: 8px; left: 8px;
    background: rgba(7,9,12,0.75);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 5px 8px;
    font-family: var(--font-mono);
    font-size: 0.6rem;
    color: var(--text-mid);
    line-height: 1.5;
    display: none;
    z-index: 5;
    letter-spacing: 0.04em;
    pointer-events: none;
}
.img-stats--visible { display: block !important; }
.stats-src, .stats-name {
    color: var(--text-muted);
    font-size: 0.55rem;
    word-break: break-all;
    display: block;
}

/* ── PREVIEW OVERLAY TOOLS ────────────────────────────────────────── */
.overlay-tools {
    position: absolute;
    top: 8px; right: 8px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    z-index: 5;
}
.overlay-tools button,
.overlay-tools .tool-divider {
    display: block;
}
.overlay-tools button {
    font-family: var(--font-mono);
    font-size: 0.62rem;
    background: rgba(7,9,12,0.8);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    color: var(--text-mid);
    border: 1px solid var(--border-hi);
    border-radius: 6px;
    padding: 5px 8px;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
    letter-spacing: 0.04em;
    min-width: 38px;
    text-align: center;
}
.overlay-tools button:active,
.overlay-tools button.active-toggle {
    background: var(--accent-dim);
    border-color: var(--accent);
    color: var(--accent);
}
.tool-divider {
    height: 1px;
    background: var(--border-hi);
    margin: 2px 0;
    opacity: 0.5;
}

/* ── SPLIT VIEW ELEMENTS ──────────────────────────────────────────── */
.split-label {
    position: absolute;
    bottom: 10px; left: 50%;
    transform: translateX(-50%);
    font-family: var(--font-mono);
    font-size: 0.58rem;
    color: rgba(255,255,255,0.35);
    letter-spacing: 0.1em;
    pointer-events: none;
    display: none;
    z-index: 4;
    white-space: nowrap;
    background: rgba(0,0,0,0.5);
    padding: 3px 8px;
    border-radius: 4px;
}
.split-label--visible { display: block !important; }

#comparisonSlider {
    position: absolute;
    top: 0; bottom: 0;
    width: 2px;
    background: var(--accent);
    cursor: col-resize;
    display: none;
    z-index: 6;
    box-shadow: 0 0 8px rgba(255,68,68,0.6);
}
.comparison-slider--visible { display: block !important; }
#comparisonSlider::before {
    content: '';
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    width: 28px; height: 28px;
    background: var(--accent);
    border-radius: 50%;
    border: 2px solid #fff;
    box-shadow: 0 2px 8px rgba(0,0,0,0.5);
}

/* ── HISTOGRAM ────────────────────────────────────────────────────── */
#histOverlay {
    position: absolute;
    bottom: 36px; left: 8px;
    width: 120px; height: 64px;
    border-radius: 4px;
    border: 1px solid var(--border-hi);
    background: rgba(0,0,0,0.75);
    display: none;
    z-index: 12;
    pointer-events: none;
}
.hist-overlay--visible { display: block !important; }

/* ── ZOOM SLIDER ──────────────────────────────────────────────────── */
.zoom-slider-overlay {
    position: absolute;
    bottom: 12px;
    left: 50%;
    transform: translateX(-50%);
    width: 160px;
    background: rgba(7,9,12,0.8);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    border: 1px solid var(--border-hi);
    border-radius: 20px;
    padding: 6px 14px;
    display: none;
    z-index: 15;
}
.zoom-overlay--visible { display: block !important; }
.zoom-slider-overlay input[type="range"] { margin: 0; }

/* ══════════════════════════════════════════════════════════════════
   BATCH PROGRESS
══════════════════════════════════════════════════════════════════ */
#batchProgressTrack {
    height: 3px;
    background: var(--bg-panel);
    display: none;
    flex-shrink: 0;
    z-index: 25;
}
#batchProgressBar {
    height: 100%;
    width: 0%;
    background: var(--cyan);
    transition: width 0.3s;
}

/* ══════════════════════════════════════════════════════════════════
   BOTTOM TAB BAR  —  4 tabs: Presets | Adjust | Dither | Tools
══════════════════════════════════════════════════════════════════ */
.tab-bar {
    height: calc(var(--tab-h) + var(--safe-bot));
    padding-bottom: var(--safe-bot);
    background: var(--bg-panel);
    border-top: 1px solid var(--border);
    display: flex;
    align-items: stretch;
    flex-shrink: 0;
    position: relative;
    z-index: 30;
}
.tab-bar::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255,68,68,0.2), transparent);
}

.tab-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px 4px;
    position: relative;
    transition: color var(--transition);
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}
.tab-btn .tab-icon {
    font-size: 1.2rem;
    line-height: 1;
    transition: transform var(--transition);
}
.tab-btn .tab-label {
    font-family: var(--font-ui);
    font-size: 0.6rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    transition: color var(--transition);
    text-transform: uppercase;
}
.tab-btn::after {
    content: '';
    position: absolute;
    top: 0; left: 20%; right: 20%;
    height: 2px;
    background: var(--accent);
    border-radius: 0 0 2px 2px;
    transform: scaleX(0);
    transition: transform 0.2s ease;
}
.tab-btn.active .tab-label { color: var(--accent); }
.tab-btn.active .tab-icon  { transform: translateY(-1px); }
.tab-btn.active::after     { transform: scaleX(1); }

/* Tab color themes */
.tab-btn[data-tab="presets"].active .tab-label { color: var(--green); }
.tab-btn[data-tab="presets"].active::after     { background: var(--green); }
.tab-btn[data-tab="adjust"].active  .tab-label { color: var(--blue); }
.tab-btn[data-tab="adjust"].active::after      { background: var(--blue); }
.tab-btn[data-tab="dither"].active  .tab-label { color: var(--purple); }
.tab-btn[data-tab="dither"].active::after      { background: var(--purple); }
.tab-btn[data-tab="tools"].active   .tab-label { color: var(--amber); }
.tab-btn[data-tab="tools"].active::after       { background: var(--amber); }

/* ── EXPORT BUTTON  (replaces separate export bar) ────────────────── */
.tab-btn[data-tab="export"] {
    flex: 1.4;
    background: var(--accent);
    border-radius: 10px;
    margin: 8px 10px;
    padding: 0;
    box-shadow: 0 2px 12px rgba(255,68,68,0.35);
    transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
}
.tab-btn[data-tab="export"] .tab-label {
    color: #fff;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.06em;
}
.tab-btn[data-tab="export"] .tab-icon { font-size: 1.1rem; }
.tab-btn[data-tab="export"]:active {
    background: #cc2222;
    transform: scale(0.97);
    box-shadow: 0 1px 6px rgba(255,68,68,0.2);
}
.tab-btn[data-tab="export"]::after { display: none; }
.tab-btn[data-tab="export"].pending {
    animation: exportPulse 1.6s ease-in-out infinite;
}
@keyframes exportPulse {
    0%, 100% { box-shadow: 0 2px 12px rgba(255,68,68,0.35); }
    50%       { box-shadow: 0 4px 24px rgba(255,68,68,0.7); }
}
/* Sim indicator */
.tab-btn[data-tab="export"][data-sim] {
    background: linear-gradient(135deg, #cc7700, #995500);
    box-shadow: 0 2px 12px rgba(255,170,0,0.35);
}

/* ══════════════════════════════════════════════════════════════════
   CONTROL DRAWER  —  slides up from bottom over the preview
══════════════════════════════════════════════════════════════════ */
.drawer {
    position: fixed;
    left: 0; right: 0;
    bottom: calc(var(--tab-h) + var(--safe-bot));
    height: 65vh;
    max-height: calc(100dvh - var(--nav-h) - var(--tab-h) - var(--safe-bot) - 20px);
    background: var(--bg-panel);
    border-top: 1px solid var(--border-hi);
    border-radius: 16px 16px 0 0;
    display: flex;
    flex-direction: column;
    z-index: 28;
    transform: translateY(100%);
    transition: transform 0.32s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 -8px 32px rgba(0,0,0,0.6);
    will-change: transform;
    overflow: hidden;
}
.drawer.open {
    transform: translateY(0);
}

/* Drag handle */
.drawer-handle {
    width: 36px; height: 4px;
    background: var(--border-hi);
    border-radius: 2px;
    margin: 10px auto 6px;
    flex-shrink: 0;
    cursor: pointer;
}

/* Drawer header row */
.drawer-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 14px 10px;
    flex-shrink: 0;
    border-bottom: 1px solid var(--border);
}
.drawer-title {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}
.drawer-title.green  { color: var(--green); }
.drawer-title.blue   { color: var(--blue); }
.drawer-title.purple { color: var(--purple); }
.drawer-title.amber  { color: var(--amber); }

.drawer-close {
    width: 28px; height: 28px;
    background: var(--bg-card);
    border: 1px solid var(--border-hi);
    border-radius: 50%;
    color: var(--text-mid);
    font-size: 0.9rem;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer;
    transition: all var(--transition);
    flex-shrink: 0;
}
.drawer-close:active {
    background: var(--accent-dim);
    border-color: var(--accent);
    color: var(--accent);
}

/* Scrollable body */
.drawer-body {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    padding: 10px 14px calc(10px + var(--safe-bot));
    display: flex;
    flex-direction: column;
    gap: 8px;
}

/* Tabs within drawer (sub-navigation for Adjust panel) */
.drawer-subtabs {
    display: flex;
    gap: 4px;
    flex-shrink: 0;
    padding: 0 14px 8px;
    overflow-x: auto;
    scrollbar-width: none;
}
.drawer-subtabs::-webkit-scrollbar { display: none; }
.drawer-subtab {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    padding: 5px 10px;
    border-radius: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-hi);
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
    flex-shrink: 0;
    text-transform: uppercase;
}
.drawer-subtab.active {
    background: var(--blue-dim);
    border-color: var(--blue);
    color: var(--blue);
}

/* Sub-panels */
.sub-panel { display: none; flex-direction: column; gap: 8px; }
.sub-panel.active { display: flex; }

/* ══════════════════════════════════════════════════════════════════
   CONTROL SECTIONS  —  inside drawers
══════════════════════════════════════════════════════════════════ */
.section {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
}
.section-title {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-mid);
    padding: 10px 12px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}
.section-title:active { background: rgba(255,255,255,0.02); }
.section-title-inner { display: flex; align-items: center; gap: 8px; }
.section-dot {
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--accent);
    flex-shrink: 0;
    opacity: 0.6;
}
.chev {
    font-size: 0.5rem;
    color: var(--text-muted);
    transition: transform 0.2s ease;
}
.section.collapsed .chev { transform: rotate(-90deg); }
.section.collapsed .section-body { display: none; }

.section-body {
    padding: 4px 12px 12px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    border-top: 1px solid var(--border);
}

/* ── CONTROL GROUPS ───────────────────────────────────────────────── */
.control-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.control-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}
.control-header label {
    font-family: var(--font-ui);
    font-size: 0.74rem;
    color: var(--text-mid);
    font-weight: 500;
    flex-shrink: 1;
    min-width: 0;
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

/* ── FORM CONTROLS ─────────────────────────────────────────────────── */
input[type="number"],
input[type="text"],
select {
    font-family: var(--font-mono);
    font-size: 0.76rem;
    background: var(--bg-input);
    color: var(--text-main);
    border: 1px solid var(--border-hi);
    border-radius: var(--radius-sm);
    padding: 8px 10px;
    width: 100%;
    transition: border-color var(--transition), box-shadow var(--transition);
    appearance: none;
    -webkit-appearance: none;
    outline: none;
    min-height: 38px;
}
.control-header input[type="number"] {
    width: 58px;
    min-width: 58px;
    text-align: right;
    flex-shrink: 0;
    padding: 5px 8px;
    min-height: 30px;
    font-size: 0.72rem;
}
input[type="number"]:focus,
input[type="text"]:focus,
select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-dim);
}
select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%23555'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    padding-right: 28px;
    cursor: pointer;
}
select option, select optgroup { background: var(--bg-panel); color: var(--text-main); }

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 5px;
    background: var(--border-hi);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
    margin: 2px 0;
}
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px; height: 20px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid var(--bg-deep);
    box-shadow: 0 0 6px rgba(255,68,68,0.4);
}
input[type="range"]::-moz-range-thumb {
    width: 20px; height: 20px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid var(--bg-deep);
}

input[type="checkbox"] {
    accent-color: var(--accent);
    width: 17px; height: 17px;
    cursor: pointer;
    flex-shrink: 0;
}

.check-label {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.78rem;
    color: var(--text-main);
    cursor: pointer;
    padding: 2px 0;
    -webkit-tap-highlight-color: transparent;
}

/* ── BUTTONS ──────────────────────────────────────────────────────── */
button, label.btn {
    font-family: var(--font-ui);
    font-size: 0.78rem;
    font-weight: 600;
    background: var(--bg-card);
    color: var(--text-main);
    border: 1px solid var(--border-hi);
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    white-space: nowrap;
    transition: all var(--transition);
    letter-spacing: 0.02em;
    flex-shrink: 0;
    position: relative;
    text-align: center;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    min-height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}
button:active, label.btn:active {
    transform: scale(0.97);
    opacity: 0.85;
}

button.primary {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
    box-shadow: 0 2px 10px rgba(255,68,68,0.3);
}
button.active-toggle {
    background: var(--accent-dim);
    border-color: var(--accent);
    color: var(--accent);
}

/* Coloured preset buttons */
button.btn-green  { color: var(--green);  border-color: rgba(0,230,118,0.2);  background: rgba(0,230,118,0.05); }
button.btn-blue   { color: var(--blue);   border-color: rgba(74,158,255,0.2); background: rgba(74,158,255,0.05); }
button.btn-amber  { color: var(--amber);  border-color: rgba(255,170,0,0.2);  background: rgba(255,170,0,0.05); }
button.btn-purple { color: var(--purple); border-color: rgba(192,132,252,0.2);background: rgba(192,132,252,0.05); }
button.btn-cyan   { color: var(--cyan);   border-color: rgba(34,211,238,0.2); background: rgba(34,211,238,0.05); }
button.btn-smart-mdf {
    background: linear-gradient(135deg, rgba(255,140,60,0.12), rgba(255,68,68,0.08));
    color: #ff9050;
    border-color: rgba(255,140,60,0.35);
    font-weight: 600;
}

/* Extended tools */
button.btn-save-config  { color: var(--blue);  }
button.btn-load-config  { color: var(--blue);  }
button.btn-est-time     { color: #80deea; }
button.btn-edge-mode    { color: #ce93d8; }
button.btn-vector-exp   { color: #ffab91; }
button.btn-vector-trace { color: #4fc3f7; border-color: rgba(21,101,192,0.4); background: rgba(21,101,192,0.08); }
button.btn-bg-remove    { color: #a5d6a7; border-color: rgba(46,125,50,0.4);  background: rgba(46,125,50,0.08); }
button.btn-gcode-export { color: #ffcc80; border-color: rgba(230,81,0,0.4);   background: rgba(230,81,0,0.08); }

/* Simple Mode button */
#btnSimpleMode { color: var(--green); font-weight: 600; }
#btnSimpleMode.simple-active {
    background: var(--green-dim);
    border-color: var(--green);
    color: var(--green);
    box-shadow: 0 0 10px rgba(0,230,118,0.2);
}

/* ── PRESET BUTTON GRID ───────────────────────────────────────────── */
.preset-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}
.preset-btn-big {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 14px 10px;
    min-height: 64px;
    border-radius: var(--radius);
    border: 1px solid;
    background: transparent;
    cursor: pointer;
    transition: all var(--transition);
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}
.preset-btn-big .picon { font-size: 1.4rem; }
.preset-btn-big .pname {
    font-family: var(--font-ui);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.03em;
}
.preset-btn-big .pdesc {
    font-size: 0.6rem;
    opacity: 0.7;
    font-family: var(--font-mono);
}
.preset-btn-big:active { transform: scale(0.96); }

/* size + material row in presets */
.size-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    align-items: end;
}
.field-label {
    font-size: 0.68rem;
    color: var(--text-mid);
    margin-bottom: 4px;
    font-weight: 500;
    letter-spacing: 0.03em;
}

/* ── ESTIMATION ───────────────────────────────────────────────────── */
.estimation {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    color: var(--amber);
    background: var(--amber-dim);
    border: 1px solid rgba(255,170,0,0.2);
    border-radius: 6px;
    padding: 8px 10px;
    line-height: 1.4;
}

/* ── TOAST ────────────────────────────────────────────────────────── */
#toast {
    position: fixed;
    bottom: calc(var(--tab-h) + var(--safe-bot) + 12px);
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    background: rgba(15, 18, 25, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-hi);
    color: var(--text-main);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    padding: 9px 18px;
    border-radius: 20px;
    opacity: 0;
    pointer-events: none;
    z-index: 9900;
    white-space: nowrap;
    max-width: 90vw;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: opacity 0.22s ease, transform 0.22s ease;
    letter-spacing: 0.04em;
}
#toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ══════════════════════════════════════════════════════════════════
   MODALS
══════════════════════════════════════════════════════════════════ */
.modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 9200;
    background: rgba(0,0,0,0.85);
    display: none;
    align-items: flex-end;
    justify-content: center;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}
.modal-overlay.open { display: flex; }
.modal-content {
    background: var(--bg-panel);
    border: 1px solid var(--border-hi);
    border-radius: 20px 20px 0 0;
    width: 100%;
    max-height: 90dvh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: slideUp 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.modal-wide { max-width: 600px; }
@keyframes slideUp {
    from { transform: translateY(100%); opacity: 0; }
    to   { transform: translateY(0);    opacity: 1; }
}
.modal-header {
    padding: 16px 18px 14px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
}
.modal-header h2 {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    color: var(--text-main);
}
.modal-header button {
    width: 30px; height: 30px;
    background: var(--bg-card);
    border: 1px solid var(--border-hi);
    border-radius: 50%;
    color: var(--text-mid);
    font-size: 1rem;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer;
    padding: 0;
    min-height: unset;
}
.modal-body {
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding: 14px 16px calc(14px + var(--safe-bot));
    display: flex;
    flex-direction: column;
    gap: 12px;
    flex: 1;
}

/* ── SIMPLE MODE MODAL ────────────────────────────────────────────── */
.simple-steps-hint {
    display: flex;
    gap: 8px;
    justify-content: center;
    padding-bottom: 4px;
}
.step-dot {
    font-family: var(--font-mono);
    font-size: 0.62rem;
    color: var(--text-muted);
    padding: 4px 10px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    letter-spacing: 0.05em;
}
.step-dot::before {
    content: attr(data-n) '. ';
    color: var(--accent);
    font-weight: 700;
}
.simple-step {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 14px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.simple-step label {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: var(--accent);
    text-transform: uppercase;
}
.simple-size-row {
    display: flex;
    align-items: center;
    gap: 10px;
}
.simple-size-row > div { flex: 1; }
.simple-dim-label {
    font-size: 0.68rem;
    color: var(--text-muted);
    margin-bottom: 4px;
}
.simple-size-separator {
    color: var(--text-muted);
    font-size: 1rem;
    margin-top: 16px;
}
.simple-tip {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-style: italic;
}
.simple-footer-note {
    font-size: 0.72rem;
    color: var(--text-muted);
    line-height: 1.6;
    text-align: center;
    padding: 4px 0;
}
#simpleStatus {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--green);
    min-height: 18px;
    text-align: center;
}

/* ── KEYBOARD SHORTCUT PANEL ──────────────────────────────────────── */
#kbHelp {
    position: fixed;
    bottom: calc(var(--tab-h) + var(--safe-bot) + 10px);
    left: 10px; right: 10px;
    background: var(--bg-panel);
    border: 1px solid var(--border-hi);
    border-radius: var(--radius);
    padding: 12px 14px;
    display: none;
    flex-direction: column;
    gap: 6px;
    z-index: 9500;
    font-size: 0.76rem;
    color: var(--text-mid);
    line-height: 1.6;
    box-shadow: 0 4px 24px rgba(0,0,0,0.6);
}
#kbHelp.visible { display: flex; }
.kb-title {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: var(--accent);
    text-transform: uppercase;
    padding-bottom: 6px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 2px;
}
kbd {
    display: inline-block;
    background: var(--bg-card);
    border: 1px solid var(--border-hi);
    border-radius: 4px;
    padding: 1px 5px;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-main);
    min-width: 52px;
    text-align: center;
    margin-right: 6px;
}

/* ── VECTOR TRACE STATUS ──────────────────────────────────────────── */
#vtStatus {
    font-size: 0.8rem;
    color: var(--amber);
    min-height: 18px;
}
#vtPreviewCanvas {
    max-width: 100%;
    border: 1px solid var(--border);
    border-radius: 4px;
    display: none;
    margin-top: 10px;
}

/* G-Code preview textarea */
#gcPreviewText { border-radius: 4px; outline: none; }
#gcPreviewText:focus { border-color: var(--accent); }

/* ── HELP MODAL ───────────────────────────────────────────────────── */
.help-section {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 14px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.help-section-title {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
}
.help-steps { display: flex; flex-direction: column; gap: 10px; }
.help-step {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    font-size: 0.82rem;
    color: #ccc;
    line-height: 1.5;
}
.help-step-num {
    width: 26px; height: 26px;
    border-radius: 50%;
    background: var(--accent);
    color: #fff;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 700;
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
}
.help-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 0.8rem;
    color: #bbb;
    line-height: 1.5;
}
.help-badge {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 4px;
    white-space: nowrap;
    flex-shrink: 0;
    margin-top: 1px;
}
.help-badge.green  { background: var(--green-dim);  color: var(--green);  border: 1px solid rgba(0,230,118,0.3); }
.help-badge.blue   { background: var(--blue-dim);   color: var(--blue);   border: 1px solid rgba(74,158,255,0.3); }
.help-badge.orange { background: rgba(255,140,60,0.15); color: #ff9050;   border: 1px solid rgba(255,140,60,0.3); }
.help-badge.amber  { background: var(--amber-dim);  color: var(--amber);  border: 1px solid rgba(255,170,0,0.3); }
.help-badge.purple { background: var(--purple-dim); color: var(--purple); border: 1px solid rgba(192,132,252,0.3); }
.help-badge.cyan   { background: var(--cyan-dim);   color: var(--cyan);   border: 1px solid rgba(34,211,238,0.3); }
.help-badge-plain {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 4px;
    white-space: nowrap;
    flex-shrink: 0;
    margin-top: 1px;
    background: rgba(255,255,255,0.06);
    color: #aaa;
    border: 1px solid var(--border-hi);
}
.help-note {
    font-size: 0.78rem;
    color: var(--green);
    background: rgba(0,230,118,0.08);
    border: 1px solid rgba(0,230,118,0.2);
    border-radius: 6px;
    padding: 8px 12px;
    line-height: 1.5;
}
.help-para { font-size: 0.8rem; color: #bbb; line-height: 1.6; margin: 0; }
.help-footer {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    color: var(--text-muted);
    text-align: center;
    padding-top: 8px;
    border-top: 1px solid var(--border);
    letter-spacing: 0.04em;
}

/* ── MISC ─────────────────────────────────────────────────────────── */
.sim-preview-label {
    font-size: 0.65rem;
    color: var(--amber);
    font-style: italic;
    margin-left: 4px;
    opacity: 0.8;
}
.ctrl-hidden { display: none !important; }

/* USM detail controls */
.usm-detail-controls .control-header { margin-top: 4px; }
.usm-detail-controls select {
    width: auto;
    min-width: 110px;
    padding: 5px 24px 5px 8px;
    font-size: 0.72rem;
}
.usm-detail-controls input[type="number"] {
    width: 52px;
    padding: 5px 6px;
    font-size: 0.72rem;
}

/* ── DRAG-OVER STATE ──────────────────────────────────────────────── */
body.drag-over .preview-container {
    outline: 2px dashed var(--accent);
    outline-offset: -4px;
}

/* ══════════════════════════════════════════════════════════════════
   TABLET / DESKTOP  —  side-by-side layout
══════════════════════════════════════════════════════════════════ */
@media (min-width: 768px) {
    body { overflow: hidden; }

    .workspace {
        flex-direction: row;
        height: calc(100dvh - var(--nav-h));
    }

    .preview-container {
        flex: 1;
        height: 100%;
        border-right: 1px solid var(--border);
        border-bottom: none;
    }

    /* On desktop the tab bar becomes a sidebar */
    .tab-bar {
        width: 64px;
        height: 100%;
        flex-direction: column;
        border-top: none;
        border-left: 1px solid var(--border);
        padding-bottom: 0;
        padding-top: 0;
        order: 3;
    }
    .tab-btn {
        flex: none;
        height: 64px;
        width: 100%;
    }
    .tab-btn::after {
        top: auto; left: 0; right: auto;
        width: 2px; height: 40%;
        top: 30%;
        transform: scaleY(0);
    }
    .tab-btn.active::after { transform: scaleY(1); }

    /* Drawer becomes a permanent side panel */
    .drawer {
        position: static;
        width: 300px;
        height: 100%;
        max-height: 100%;
        transform: none !important;
        border-top: none;
        border-right: 1px solid var(--border);
        border-radius: 0;
        box-shadow: none;
        order: 2;
        transition: none;
    }
    .drawer-handle { display: none; }
    .drawer-close  { display: none; }

    /* Export bar restores below preview on desktop */
    #exportBarDesktop {
        display: flex !important;
        position: absolute;
        bottom: 0; left: 0; right: 64px;
        height: 56px;
        background: rgba(7,9,12,0.9);
        border-top: 1px solid var(--accent);
        backdrop-filter: blur(8px);
        align-items: center;
        padding: 0 16px;
        z-index: 25;
    }
    #exportBarDesktop button {
        flex: 1;
        height: 40px;
        font-size: 0.88rem;
        font-weight: 700;
        letter-spacing: 0.05em;
    }

    #batchProgressTrack {
        position: absolute;
        top: 0; left: 0; right: 64px;
        height: 3px;
    }
}

/* ══════════════════════════════════════════════════════════════════
   NARROW PHONE TWEAKS
══════════════════════════════════════════════════════════════════ */
@media (max-width: 360px) {
    .nav-logo { font-size: 0; gap: 0; }
    .nav-logo-icon { width: 18px; height: 18px; }
    .nav-version { display: none; }
    .tab-btn .tab-label { font-size: 0.54rem; }
}