/* ══════════════════════════════════════════════════════════════════════════════
   Material 3 Design Tokens — QRtist Dark Theme
   ══════════════════════════════════════════════════════════════════════════════ */
[data-lucide] {
    width: 1em;
    height: 1em;
    display: inline-block;
    vertical-align: -0.125em;
}

:root {
    /* M3 Color Roles — Dark theme with strong contrast */
    --md-primary:            #7aa2f7;
    --md-on-primary:         #003061;
    --md-primary-container:  #0b4a8a;
    --md-on-primary-container: #d3e3fd;

    --md-secondary:          #bec6dc;
    --md-on-secondary:       #283141;
    --md-secondary-container: #3e4759;
    --md-on-secondary-container: #d9e3f8;

    --md-tertiary:           #5cd9c0;
    --md-on-tertiary:        #003730;
    --md-tertiary-container: #005046;
    --md-on-tertiary-container: #a0f0dc;

    --md-error:              #ffb4ab;
    --md-on-error:          #690005;
    --md-error-container:   #93000a;
    --md-on-error-container: #ffdad6;

    /* Surfaces */
    --md-surface:            #0f141e;
    --md-surface-dim:        #0f141e;
    --md-surface-bright:     #353a45;
    --md-surface-container-lowest:  #0a0f19;
    --md-surface-container-low:     #171c28;
    --md-surface-container:         #1b212e;
    --md-surface-container-high:    #262c39;
    --md-surface-container-highest: #313744;

    --md-on-surface:         #e2e2e9;
    --md-on-surface-variant: #c4c6cf;
    --md-surface-variant:    #44474f;

    --md-outline:            #8e9099;
    --md-outline-variant:    #44474f;

    --md-inverse-surface:    #e2e2e9;
    --md-inverse-on-surface: #2e3036;
    --md-inverse-primary:    #2e6aaf;

    --md-scrim:              #000000;
    --md-shadow:             #000000;

    /* State layer opacities (M3 spec) */
    --md-state-hover:   0.08;
    --md-state-pressed: 0.12;
    --md-state-focus:   0.12;

    /* M3 Elevation */
    --md-elevation-0: none;
    --md-elevation-1: 0 1px 2px rgba(59,130,246,0.12), 0 1px 3px 1px rgba(59,130,246,0.08);
    --md-elevation-2: 0 1px 2px rgba(59,130,246,0.15), 0 2px 6px 2px rgba(59,130,246,0.10);
    --md-elevation-3: 0 4px 8px 3px rgba(59,130,246,0.10), 0 1px 3px rgba(59,130,246,0.12);

    /* M3 Shape scale */
    --md-shape-none:       0px;
    --md-shape-extra-small: 4px;
    --md-shape-small:       8px;
    --md-shape-medium:      12px;
    --md-shape-large:       16px;
    --md-shape-extra-large: 28px;
    --md-shape-full:        9999px;

    /* M3 Typography — Roboto with system fallback */
    --md-font: 'Satoshi', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;

    /* Spring easing curves */
    --spring-snappy: cubic-bezier(0.34, 1.56, 0.64, 1);
    --spring-smooth: cubic-bezier(0.22, 1, 0.36, 1);
    --spring-standard: cubic-bezier(0.2, 0, 0, 1);
}

/* ══════════════════════════════════════════════════════════════════════════════
   Reset & Base
   ══════════════════════════════════════════════════════════════════════════════ */
html {
    scrollbar-width: none;
}
html::-webkit-scrollbar { display: none; }

body {
    font-family: var(--md-font);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background: var(--md-surface);
    color: var(--md-on-surface);
}

/* ══════════════════════════════════════════════════════════════════════════════
   M3 Header — Top App Bar
   ══════════════════════════════════════════════════════════════════════════════ */
header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 16px;
    background: var(--md-surface-container);
    border-bottom: 1px solid var(--md-outline-variant);
}

/* Sticky top app bar — does not depend on Tailwind utility classes so it can't
   be accidentally overridden. Frosted glass on mobile for legibility over scroll. */
.app-header {
    position: sticky;
    top: 0;
    z-index: 50;
}
@media (min-width: 769px) and (max-width: 1023px) {
    header { padding: 8px 24px; }
}
@media (min-width: 1024px) {
    header { padding: 8px 32px; }
}
@media (max-width: 768px) {
    .app-header {
        box-shadow: var(--md-elevation-2);
        background: rgba(23, 28, 40, 0.85);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        border-bottom: 1px solid color-mix(in srgb, var(--md-outline-variant) 60%, transparent);
    }
}

.logo-icon {
    position: relative;
    width: 40px;
    height: 40px;
    border-radius: var(--md-shape-medium);
    background: var(--md-primary-container);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.header-title {
    color: var(--md-on-surface);
    font-weight: 400;
    font-size: 1.375rem;
    letter-spacing: 0;
    line-height: 1.5;
    text-wrap: balance;
}

.header-subtitle {
    position: relative;
    padding-left: 12px;
    color: var(--md-on-surface-variant);
    font-size: 0.8125rem;
    font-weight: 400;
    letter-spacing: 0.02em;
    line-height: 1.45;
}
.header-subtitle::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 2px;
    height: 14px;
    background: var(--md-primary);
    border-radius: var(--md-shape-full);
}

/* M3 Icon buttons (header action) */
.header-action-btn {
    width: 40px;
    height: 40px;
    border-radius: var(--md-shape-full);
    background: transparent;
    border: none;
    color: var(--md-on-surface-variant);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    position: relative;
    cursor: pointer;
    transition: background 0.2s ease, transform 0.15s var(--spring-snappy);
    -webkit-tap-highlight-color: transparent;
}
.header-action-btn:active {
    transform: scale(0.92);
}
.header-action-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: currentColor;
    opacity: 0;
    transition: opacity 0.2s ease;
    pointer-events: none;
}
.header-action-btn:hover::before { opacity: var(--md-state-hover); }
.header-action-btn:active::before { opacity: var(--md-state-pressed); }
.header-action-btn:focus-visible {
    outline: 2px solid var(--md-primary);
    outline-offset: 2px;
}
.header-action-btn:disabled {
    opacity: 0.38;
    cursor: default;
    pointer-events: none;
    transition: opacity 0.25s ease;
}

/* ══════════════════════════════════════════════════════════════════════════════
   M3 Panels — Card (Filled variant)
   ══════════════════════════════════════════════════════════════════════════════ */
.panel-card {
    display: flex;
    flex-direction: column;
    min-height: 0;
    height: auto;
    max-height: none;
    background: var(--md-surface-container-low);
    border: 1px solid color-mix(in srgb, var(--md-outline-variant) 80%, transparent);
    border-radius: var(--md-shape-medium);
    position: relative;
    transition: box-shadow 0.25s var(--spring-smooth), transform 0.25s var(--spring-smooth), border-color 0.25s ease;
}
.panel-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--md-elevation-2);
    border-color: color-mix(in srgb, var(--md-primary) 30%, var(--md-outline-variant));
}

/* Scan panel slide animation */
#scanPanel {
    overflow: hidden;
    transition: max-height 0.35s var(--spring-smooth), opacity 0.25s ease;
}
#scanPanel.panel-hidden {
    max-height: 0 !important;
    opacity: 0;
    pointer-events: none;
}
#scanPanel.panel-visible {
    max-height: 800px;
    opacity: 1;
}

/* Header popup menu animation */
#headerMenu {
    transform-origin: top right;
    transition: opacity 0.2s ease, transform 0.25s var(--spring-smooth);
}
#headerMenu.menu-hidden {
    opacity: 0;
    transform: scale(0.92) translateY(-6px);
    pointer-events: none;
}
#headerMenu.menu-visible {
    opacity: 1;
    transform: scale(1) translateY(0);
}

/* Scan result slide-in animation */
#scanResult {
    transition: opacity 0.3s ease, transform 0.3s var(--spring-smooth);
}
#scanResult.result-hidden {
    opacity: 0;
    transform: translateY(8px);
}
#scanResult.result-visible {
    opacity: 1;
    transform: translateY(0);
}

@media (min-width: 1024px) {
    .design-panel {
        max-height: calc(100vh - 180px);
        height: auto;
        min-height: 400px;
    }
}
@media (max-width: 768px) {
    .design-panel {
        max-height: none;
        height: auto;
    }
}

/* Panel section headers */
.design-panel > div:first-child {
    border-bottom: 1px solid var(--md-outline-variant);
}

/* ══════════════════════════════════════════════════════════════════════════════
   M3 Layout
   ══════════════════════════════════════════════════════════════════════════════ */
.main-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
    padding: 16px 16px;
}
@media (min-width: 769px) and (max-width: 1023px) {
    .main-container { padding: 20px 28px; }
}
@media (min-width: 1024px) {
    .main-container {
        min-height: calc(100vh - 65px);
        padding: 24px 40px;
    }
}

/* Grain texture overlay */
.main-container::before {
    content: '';
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    opacity: 0.025;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    background-repeat: repeat;
    background-size: 256px 256px;
}

.grid-layout {
    display: grid;
    gap: 12px;
    height: auto;
    min-height: 0;
}
@media (max-width: 768px) {
    .grid-layout { grid-template-columns: 1fr; gap: 16px; }
}
@media (min-width: 769px) and (max-width: 1023px) {
    .grid-layout { grid-template-columns: 1fr; gap: 20px; }
}
@media (min-width: 1024px) {
    .grid-layout {
        grid-template-columns: 1fr 1fr 1fr;
        gap: 24px;
        height: auto;
    }
}

/* Content panel scrolling */
.design-content {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    min-height: 0;
}
.design-content::-webkit-scrollbar { width: 4px; }
.design-content::-webkit-scrollbar-track { background: transparent; }
.design-content::-webkit-scrollbar-thumb {
    background: var(--md-outline-variant);
    border-radius: var(--md-shape-full);
}

/* QR Preview responsive sizing */
@media (max-width: 640px)  { #qrCodeContainer { min-width: 120px; min-height: 120px; } }
@media (min-width: 641px) and (max-width: 1023px) { #qrCodeContainer { min-width: 140px; min-height: 140px; } }
@media (min-width: 1024px) { #qrCodeContainer { min-width: 160px; min-height: 160px; } }
#qrCodeContainer {
    max-width: 100%;
    overflow: hidden;
    border-radius: var(--md-shape-medium);
}

/* ══════════════════════════════════════════════════════════════════════════════
   M3 Buttons
   ══════════════════════════════════════════════════════════════════════════════ */
button { transition: transform 0.15s var(--spring-snappy); }
button:active { transform: scale(0.97); }

/* Filled button — primary action */
.desktop-download-btn {
    position: relative;
    overflow: hidden;
    cursor: pointer;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    border: none;
    color: var(--md-on-primary);
    font-weight: 500;
    letter-spacing: 0.01em;
    transition: background 0.2s ease, transform 0.25s var(--spring-smooth), box-shadow 0.2s ease;
}
.desktop-download-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--md-elevation-2);
}
.desktop-download-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--md-on-primary);
    opacity: 0;
    transition: opacity 0.2s ease;
    pointer-events: none;
}
.desktop-download-btn:hover::before { opacity: var(--md-state-hover); }
.desktop-download-btn:active::before { opacity: var(--md-state-pressed); }
.desktop-download-btn:focus-visible {
    outline: 2px solid var(--md-primary);
    outline-offset: 2px;
}

/* Tonal buttons — secondary actions (share, export, import, reset) */
.tonal-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: var(--md-shape-full);
    background: var(--md-secondary-container);
    color: var(--md-on-secondary-container);
    border: none;
    font-family: var(--md-font);
    font-size: 0.8125rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: box-shadow 0.2s ease, background 0.2s ease, transform 0.15s var(--spring-snappy);
    -webkit-tap-highlight-color: transparent;
}
.tonal-btn:active {
    transform: scale(0.97);
}
.tonal-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: currentColor;
    opacity: 0;
    transition: opacity 0.2s ease;
    pointer-events: none;
}
.tonal-btn:hover { box-shadow: var(--md-elevation-1); }
.tonal-btn:hover::before { opacity: var(--md-state-hover); }
.tonal-btn:active::before { opacity: var(--md-state-pressed); }

/* ══════════════════════════════════════════════════════════════════════════════
   M3 Selection Controls — Checkbox / Switch / Radio
   ══════════════════════════════════════════════════════════════════════════════ */
.grad-toggle {
    transition: background 0.25s var(--spring-standard);
    cursor: pointer;
    position: relative;
    width: 52px;
    height: 32px;
    border-radius: var(--md-shape-full);
    background: var(--md-surface-container-highest);
    border: 2px solid var(--md-outline);
    flex-shrink: 0;
}
.grad-toggle.active {
    background: var(--md-primary);
    border-color: var(--md-primary);
}
.grad-thumb {
    transition: transform 0.2s cubic-bezier(0.2, 0, 0, 1);
    position: absolute;
    top: 50%;
    left: 6px;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    border-radius: var(--md-shape-full);
    background: var(--md-outline);
}
.grad-toggle.active .grad-thumb {
    transform: translateY(-50%) translateX(20px);
    width: 24px;
    height: 24px;
    left: 2px;
    background: var(--md-on-primary);
}

/* ══════════════════════════════════════════════════════════════════════════════
   M3 Inputs — Filled text field style
   ══════════════════════════════════════════════════════════════════════════════ */
input[type="text"],
input[type="email"],
input[type="tel"],
input[type="password"],
input[type="url"],
select {
    background: var(--md-surface-container-highest);
    border: 1px solid var(--md-outline-variant);
    border-radius: var(--md-shape-extra-small) var(--md-shape-extra-small) 0 0;
    border-bottom: 1px solid var(--md-on-surface-variant);
    color: var(--md-on-surface);
    font-family: var(--md-font);
    transition: border-color 0.2s ease;
}
input[type="text"]:focus,
input[type="email"]:focus,
input[type="tel"]:focus,
input[type="password"]:focus,
input[type="url"]:focus,
select:focus {
    outline: none;
    border-color: var(--md-primary);
    border-bottom-width: 2px;
    padding-bottom: calc(0.625rem - 1px);
}

/* Range inputs — M3 Slider */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    height: 4px;
    border-radius: var(--md-shape-full);
    background: var(--md-surface-container-highest);
    outline: none;
    transition: background 0.2s;
}
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: var(--md-shape-full);
    background: var(--md-primary);
    cursor: pointer;
    border: none;
    box-shadow: var(--md-elevation-1);
    transition: box-shadow 0.2s ease, transform 0.15s var(--spring-snappy);
}
input[type="range"]::-webkit-slider-thumb:hover {
    box-shadow: var(--md-elevation-2);
    transform: scale(1.1);
}
input[type="range"]:focus::-webkit-slider-thumb {
    box-shadow: var(--md-elevation-2), 0 0 0 4px color-mix(in srgb, var(--md-primary) 25%, transparent);
}
input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: var(--md-shape-full);
    background: var(--md-primary);
    cursor: pointer;
    border: none;
    box-shadow: var(--md-elevation-1);
    transition: box-shadow 0.2s ease, transform 0.15s var(--spring-snappy);
}
input[type="range"]:focus::-moz-range-thumb {
    box-shadow: var(--md-elevation-2), 0 0 0 4px color-mix(in srgb, var(--md-primary) 25%, transparent);
}

/* Color inputs */
input[type="color"] {
    padding: 2px;
    border-radius: var(--md-shape-small);
    border: 1px solid var(--md-outline-variant);
    background: var(--md-surface-container-highest);
    cursor: pointer;
}

/* Template preview canvases */
.template-preview-canvas {
    width: 56px;
    height: 56px;
    border-radius: 8px;
    border: 1px solid var(--md-outline-variant);
    image-rendering: pixelated;
}

/* ══════════════════════════════════════════════════════════════════════════════
   M3 Accordion — Expanding panel
   ══════════════════════════════════════════════════════════════════════════════ */
details > summary {
    list-style: none;
    border-radius: var(--md-shape-medium);
    transition: background 0.2s ease;
}
details > summary::-webkit-details-marker { display: none; }
details > summary:hover {
    background: color-mix(in srgb, var(--md-on-surface) 6%, transparent);
}

.acc-chevron {
    transition: transform 0.25s var(--spring-smooth);
}
details.acc-open .acc-chevron {
    transform: rotate(180deg);
}
/* Grid-based height animation: 0fr -> 1fr animates without measuring content.
   Robust inside hidden panels and immune to content-size race conditions. */
.acc-body-wrap {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 0.3s var(--spring-smooth);
}
details.acc-open > .acc-body-wrap {
    grid-template-rows: 1fr;
}
.acc-body {
    overflow: hidden;
    min-height: 0;
    opacity: 0;
    transform: translateY(-8px);
    transition: opacity 0.3s var(--spring-smooth), transform 0.3s var(--spring-smooth);
}
details.acc-open > .acc-body-wrap > .acc-body {
    opacity: 1;
    transform: translateY(0);
}

/* ══════════════════════════════════════════════════════════════════════════════
   M3 Dividers
   ══════════════════════════════════════════════════════════════════════════════ */
.h-px,
hr {
    background: var(--md-outline-variant) !important;
    border: none !important;
    height: 1px !important;
    margin: 4px 0 !important;
}

/* ══════════════════════════════════════════════════════════════════════════════
   M3 Shape & Selection Grids
   ══════════════════════════════════════════════════════════════════════════════ */
.shape-btn,
.corner-btn,
.frame-btn,
.logo-btn {
    color: var(--md-on-surface);
    border: 1px solid var(--md-outline-variant);
    border-radius: var(--md-shape-medium);
    background: var(--md-surface-container);
    transition: background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
    position: relative;
    overflow: hidden;
}
.shape-btn::before,
.corner-btn::before,
.frame-btn::before,
.logo-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: currentColor;
    opacity: 0;
    transition: opacity 0.2s ease;
    pointer-events: none;
}
.shape-btn:hover::before,
.corner-btn:hover::before,
.frame-btn:hover::before,
.logo-btn:hover::before { opacity: var(--md-state-hover); }

/* Selected state — M3 primary keyline */
.shape-btn.selected,
.corner-btn.selected,
.frame-btn.selected,
.logo-btn.selected {
    border: 2px solid var(--md-primary);
    background: color-mix(in srgb, var(--md-primary) 12%, var(--md-surface-container));
}

.template-btn {
    transition: all 0.2s ease;
    border: 1px solid var(--md-outline-variant);
    border-radius: var(--md-shape-medium);
    background: var(--md-surface-container);
}
.template-btn:hover {
    border-color: var(--md-primary);
}
.template-btn.selected {
    border: 2px solid var(--md-primary);
    background: color-mix(in srgb, var(--md-primary) 12%, var(--md-surface-container));
}

/* ══════════════════════════════════════════════════════════════════════════════
   M3 Focus Rings
   ══════════════════════════════════════════════════════════════════════════════ */
input:focus-visible,
select:focus-visible,
button:focus-visible {
    outline: 2px solid var(--md-primary);
    outline-offset: 3px;
    transition: outline-offset 0.15s ease;
}

/* Logo grid drag feedback */
#logoDrop.drag-over {
    border-color: var(--md-primary);
    background: color-mix(in srgb, var(--md-primary) 8%, var(--md-surface-container));
}

/* ══════════════════════════════════════════════════════════════════════════════
   M3 Toast — Snackbar
   ══════════════════════════════════════════════════════════════════════════════ */
#toastContainer {
    position: fixed;
    bottom: calc(max(env(safe-area-inset-bottom, 0px), 8px) + 72px);
    left: 50%;
    transform: translateX(-50%);
    z-index: 200;
    display: flex;
    flex-direction: column-reverse;
    align-items: center;
    gap: 8px;
    pointer-events: none;
}
@media (min-width: 768px) {
    #toastContainer { bottom: 24px; }
}
.toast {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    border-radius: var(--md-shape-extra-small);
    font-family: var(--md-font);
    font-size: 0.875rem;
    font-weight: 400;
    letter-spacing: 0.02em;
    color: var(--md-inverse-on-surface);
    background: var(--md-inverse-surface);
    box-shadow: var(--md-elevation-3);
    white-space: nowrap;
    pointer-events: all;
    max-width: calc(100vw - 32px);
    animation: toastIn 0.3s cubic-bezier(0.2, 0, 0, 1);
}
.toast-success { background: #2d6a4f; color: #d8f3dc; }
.toast-error   { background: #9d0208; color: #ffd7d7; }
.toast-info    { background: var(--md-inverse-primary); color: var(--md-on-primary); }
.toast-warn    { background: #e09f3e; color: #1a1a2e; }

@keyframes toastIn {
    from { opacity: 0; transform: translateY(16px) scale(0.92); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes toastOut {
    from { opacity: 1; transform: translateY(0) scale(1); }
    to   { opacity: 0; transform: translateY(-10px) scale(0.95); }
}

/* ══════════════════════════════════════════════════════════════════════════════
   Onboarding welcome banner
   ══════════════════════════════════════════════════════════════════════════════ */
#onboardingBanner {
    animation: bannerFadeIn 0.3s cubic-bezier(0.2, 0, 0, 1);
}
#onboardingBanner.banner-hiding {
    animation: bannerFadeOut 0.3s cubic-bezier(0.2, 0, 0, 1) forwards;
}
@keyframes bannerFadeIn {
    from { opacity: 0; transform: translateY(-4px); }
    to   { opacity: 1; transform: translateY(0); }
}
@keyframes bannerFadeOut {
    from { opacity: 1; transform: translateY(0); }
    to   { opacity: 0; transform: translateY(-4px); }
}

/* ══════════════════════════════════════════════════════════════════════════════
   Inline field validation
   ══════════════════════════════════════════════════════════════════════════════ */
.field-input-error {
    border-color: var(--md-error) !important;
    box-shadow: 0 0 0 1px var(--md-error);
}
.field-error-msg {
    display: none;
    align-items: center;
    gap: 4px;
    color: var(--md-error);
    font-size: 0.75rem;
    margin-top: 4px;
}

/* ══════════════════════════════════════════════════════════════════════════════
   M3 Bottom Navigation Bar
   ══════════════════════════════════════════════════════════════════════════════ */
.mobile-tab-bar {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 50;
    background: var(--md-surface-container);
    border-top: 1px solid var(--md-outline-variant);
    padding-bottom: max(12px, env(safe-area-inset-bottom, 0px));
}
.mobile-tab-bar-inner {
    display: flex;
    height: 64px;
}
.mobile-tab-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 6px 0 8px;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--md-on-surface-variant);
    font-family: var(--md-font);
    font-size: 0.6875rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    transition: color 0.2s ease;
    position: relative;
}
.mobile-tab-btn svg {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}
.mobile-tab-btn.tab-active { color: var(--md-on-secondary-container); }

/* M3 Bottom nav indicator */
.mobile-tab-btn .tab-indicator {
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    width: 36px;
    height: 36px;
    border-radius: var(--md-shape-full);
    background: var(--md-secondary-container);
    opacity: 0;
    transition: opacity 0.25s var(--spring-standard), width 0.25s var(--spring-standard), height 0.25s var(--spring-standard);
    z-index: -1;
}
.mobile-tab-btn.tab-active .tab-indicator { opacity: 1; }

.mobile-tab-btn.tab-badge::after {
    content: '';
    position: absolute;
    top: 5px;
    right: calc(50% - 18px);
    width: 6px;
    height: 6px;
    background: var(--md-error);
    border-radius: var(--md-shape-full);
    animation: badge-pop 0.25s ease;
}
@keyframes badge-pop {
    from { transform: scale(0); }
    60%  { transform: scale(1.3); }
    to   { transform: scale(1); }
}

/* ══════════════════════════════════════════════════════════════════════════════
   Mobile Preview Actions
   ══════════════════════════════════════════════════════════════════════════════ */
.mobile-preview-actions {
    display: none;
    width: 100%;
    flex-direction: column;
    gap: 0;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--md-outline-variant);
}
@media (max-width: 767px) {
    .mobile-tab-bar         { display: block; }
    .mobile-preview-actions  { display: flex; }
}

/* ══════════════════════════════════════════════════════════════════════════════
   Mobile "Preview my QR" CTA — Filled button
   ══════════════════════════════════════════════════════════════════════════════ */
.mobile-next-btn { display: none; }
@media (max-width: 767px) {
    .mobile-next-btn {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        width: 100%;
        padding: 14px 20px;
        background: var(--md-primary);
        color: var(--md-on-primary);
        font-family: var(--md-font);
        font-weight: 500;
        font-size: 0.875rem;
        letter-spacing: 0.01em;
        border-radius: var(--md-shape-full);
        border: none;
        touch-action: manipulation;
        -webkit-tap-highlight-color: transparent;
        margin-bottom: 4px;
        transition: box-shadow 0.2s ease;
    }
    .mobile-next-btn:hover { box-shadow: var(--md-elevation-1); }
    .mobile-next-btn:active { transform: scale(0.98); }
}

/* ══════════════════════════════════════════════════════════════════════════════
   Responsive & Utility
   ══════════════════════════════════════════════════════════════════════════════ */
.uppercase {
    letter-spacing: 0.08em;
}

/* Tabular figures for dimensions */
.qr-dimension {
    font-variant-numeric: tabular-nums;
}

.cursor-pointers,
select,
input[type="color"],
input[type="range"],
[role="switch"],
button,
[role="button"] {
    cursor: pointer;
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Mobile UX */
@media (max-width: 480px) {
    .header-title { font-size: 1.25rem !important; }
    .header-subtitle { display: none !important; }
}

.hidden-desktop { display: none; }
@media (max-width: 767px) {
    .hidden-desktop { display: block; }
}
@media (max-width: 767px) {
    .mobile-hidden { display: none !important; }
}
@media (max-width: 767px) {
    .main-container {
        padding-bottom: calc(6rem + max(12px, env(safe-area-inset-bottom, 0px)));
    }
    .shape-btn, .corner-btn, .frame-btn, .logo-btn {
        min-height: 44px;
        min-width: 44px;
    }
    input[type="range"]::-webkit-slider-thumb {
        width: 24px;
        height: 24px;
    }
    input[type="range"]::-moz-range-thumb {
        width: 24px;
        height: 24px;
    }
}

@media (max-width: 767px) {
    .grid-layout > .panel-card { display: none !important; }
    .grid-layout > .panel-card.mobile-active-panel { display: flex !important; }
}

@keyframes slideUp {
    from { transform: translateY(100%); opacity: 0; }
    to   { transform: translateY(0); opacity: 1; }
}

/* ══════════════════════════════════════════════════════════════════════════════
    M3 Overrides — Override remaining Tailwind gray utility classes
   ══════════════════════════════════════════════════════════════════════════════ */

/* Background overrides */
.bg-gray-800,
.bg-gray-700,
.bg-gray-900 {
    background-color: var(--md-surface-container) !important;
}
.bg-gray-700\/50,
.bg-gray-700\/60 {
    background-color: color-mix(in srgb, var(--md-surface-container-high) 50%, transparent) !important;
}
.bg-gray-800\/50 {
    background-color: color-mix(in srgb, var(--md-surface-container) 50%, transparent) !important;
}
.bg-gray-50 {
    background-color: var(--md-surface-container-highest) !important;
}

/* Text color overrides */
.text-gray-200 { color: var(--md-on-surface) !important; }
.text-gray-300 { color: var(--md-on-surface-variant) !important; }
.text-gray-400 { color: var(--md-on-surface-variant) !important; }
.text-gray-500 { color: var(--md-outline) !important; }

/* Border overrides */
.border-gray-600 { border-color: var(--md-outline-variant) !important; }
.border-gray-700 { border-color: var(--md-outline-variant) !important; }
.border-gray-200 { border-color: var(--md-outline-variant) !important; }
.border-t { border-top-color: var(--md-outline-variant) !important; }
.border-b { border-bottom-color: var(--md-outline-variant) !important; }

/* Hover state overrides */
.hover\:bg-gray-700:hover { background-color: var(--md-surface-container-high) !important; }
.hover\:bg-gray-600:hover { background-color: var(--md-surface-container-highest) !important; }
.hover\:text-white:hover { color: var(--md-on-surface) !important; }
.hover\:bg-gray-700\/50:hover { background-color: color-mix(in srgb, var(--md-surface-container-high) 50%, transparent) !important; }
.hover\:bg-white\/10:hover { background-color: color-mix(in srgb, var(--md-on-surface) 8%, transparent) !important; }
.hover\:bg-blue-50:hover { background-color: color-mix(in srgb, var(--md-primary) 8%, transparent) !important; }
.hover\:bg-blue-900\/20:hover { background-color: color-mix(in srgb, var(--md-primary) 12%, transparent) !important; }

/* Accent color overrides for specific UI elements */
.bg-blue-600 { background-color: var(--md-primary) !important; }
.bg-blue-500 { background-color: var(--md-primary) !important; }
.bg-blue-900\/40 { background-color: color-mix(in srgb, var(--md-primary) 12%, var(--md-surface-container)) !important; }
.bg-blue-950\/40 { background-color: color-mix(in srgb, var(--md-primary) 12%, var(--md-surface-container)) !important; }
.text-blue-400 { color: var(--md-primary) !important; }
.text-blue-300 { color: var(--md-primary) !important; }
.hover\:text-blue-400:hover { color: var(--md-primary) !important; }
.hover\:text-blue-700:hover { color: var(--md-primary) !important; }
.border-blue-500\/20 { border-color: color-mix(in srgb, var(--md-primary) 20%, var(--md-outline-variant)) !important; }
.border-blue-800\/40 { border-color: color-mix(in srgb, var(--md-primary) 40%, var(--md-outline-variant)) !important; }
.border-blue-500 { border-color: var(--md-primary) !important; }
.focus\:ring-blue-500:focus { --tw-ring-color: var(--md-primary); }
.focus\:border-transparent:focus { border-color: transparent !important; }
.ring-blue-500 { --tw-ring-color: var(--md-primary); }

/* Purple / Tertiary accent */
.bg-purple-900\/40 { background-color: color-mix(in srgb, var(--md-tertiary) 12%, var(--md-surface-container)) !important; }
.bg-purple-600 { background-color: var(--md-tertiary) !important; }
.text-purple-400 { color: var(--md-tertiary) !important; }

/* Rose / Error accent */
.bg-rose-900\/40 { background-color: color-mix(in srgb, var(--md-error) 12%, var(--md-surface-container)) !important; }
.text-rose-400 { color: var(--md-error) !important; }

/* Orange / Tertiary accent */
.bg-orange-900\/30 { background-color: color-mix(in srgb, var(--md-tertiary) 10%, var(--md-surface-container)) !important; }
.text-orange-400 { color: var(--md-tertiary) !important; }

/* Yellow accent */
.bg-yellow-900\/30 { background-color: color-mix(in srgb, var(--md-primary) 10%, var(--md-surface-container)) !important; }
.text-yellow-400 { color: var(--md-primary) !important; }

/* Indigo accent */
.bg-indigo-900\/30 { background-color: color-mix(in srgb, var(--md-secondary) 10%, var(--md-surface-container)) !important; }
.text-indigo-400 { color: var(--md-secondary) !important; }

/* Green accent */
.bg-green-900\/30 { background-color: color-mix(in srgb, var(--md-tertiary) 10%, var(--md-surface-container)) !important; }
.text-green-400 { color: var(--md-tertiary) !important; }

/* Pink accent */
.bg-pink-900\/30 { background-color: color-mix(in srgb, var(--md-error) 10%, var(--md-surface-container)) !important; }
.text-pink-400 { color: var(--md-error) !important; }

/* Emerald / Success accent */
.bg-emerald-400 { background-color: var(--md-tertiary) !important; }
.bg-emerald-600 { background-color: var(--md-tertiary) !important; }
.bg-emerald-500 { background-color: var(--md-tertiary) !important; }
.text-emerald-300 { color: var(--md-tertiary) !important; }
.border-emerald-800 { border-color: color-mix(in srgb, var(--md-tertiary) 40%, var(--md-outline-variant)) !important; }
.bg-emerald-950\/50 { background-color: color-mix(in srgb, var(--md-tertiary) 12%, var(--md-surface-container)) !important; }

/* Amber / Warning accent */
.bg-amber-950\/50 { background-color: color-mix(in srgb, #f59e0b 12%, var(--md-surface-container)) !important; }
.text-amber-300 { color: #f59e0b !important; }
.border-amber-800 { border-color: color-mix(in srgb, #f59e0b 40%, var(--md-outline-variant)) !important; }

/* Selection states */
.dark\:bg-blue-900\/30 { background-color: color-mix(in srgb, var(--md-primary) 10%, var(--md-surface-container)) !important; }
.dark\:bg-blue-900\/20 { background-color: color-mix(in srgb, var(--md-primary) 8%, var(--md-surface-container)) !important; }
.dark\:bg-gray-700 { background-color: var(--md-surface-container) !important; }
.dark\:border-blue-400 { border-color: var(--md-primary) !important; }
.dark\:text-gray-200 { color: var(--md-on-surface) !important; }
.dark\:text-gray-100 { color: var(--md-on-surface) !important; }
.dark\:text-gray-300 { color: var(--md-on-surface-variant) !important; }
.dark\:text-gray-400 { color: var(--md-on-surface-variant) !important; }
.dark\:bg-gray-800 { background-color: var(--md-surface-container) !important; }
.dark\:bg-gray-700\/50 { background-color: color-mix(in srgb, var(--md-surface-container-high) 50%, transparent) !important; }
.dark\:hover\:bg-gray-700\/60:hover { background-color: color-mix(in srgb, var(--md-surface-container-high) 60%, transparent) !important; }
.dark\:border-gray-600 { border-color: var(--md-outline-variant) !important; }
.dark\:border-gray-700 { border-color: var(--md-outline-variant) !important; }
.dark\:text-gray-500 { color: var(--md-outline) !important; }
.dark\:bg-gray-800\/50 { background-color: color-mix(in srgb, var(--md-surface-container) 50%, transparent) !important; }

/* Specific component fixes */
select {
    background-color: var(--md-surface-container-highest) !important;
    border: 1px solid var(--md-outline-variant) !important;
    border-radius: var(--md-shape-extra-small) !important;
    color: var(--md-on-surface) !important;
    padding: 10px 12px !important;
    font-size: 0.875rem !important;
}
select:focus {
    border-color: var(--md-primary) !important;
    outline: none !important;
    box-shadow: 0 0 0 1px var(--md-primary) !important;
}

/* Text white override */
.text-white { color: var(--md-on-surface) !important; }
.text-white\/80 { color: color-mix(in srgb, var(--md-on-surface) 80%, transparent) !important; }

/* Ring and shadow overrides */
.ring-1 { --tw-ring-color: var(--md-outline-variant); }
.ring-gray-600 { --tw-ring-color: var(--md-outline-variant); }
.shadow-sm { box-shadow: var(--md-elevation-1) !important; }
.shadow-xl { box-shadow: var(--md-elevation-3) !important; }

/* Separator dividers */
.h-px { background-color: var(--md-outline-variant) !important; }
.border-t { border-top-color: var(--md-outline-variant) !important; }
.border-b { border-bottom-color: var(--md-outline-variant) !important; }

/* Scanner styles */
#scanDropZone.drag-over {
    border-color: var(--md-primary);
    background: color-mix(in srgb, var(--md-primary) 8%, transparent);
}

/* Batch overlay */
#batchOverlay .batch-thumb {
    width: 80px;
    height: 80px;
    border-radius: 0.5rem;
    background: var(--md-surface-container-highest);
    border: 1px solid var(--md-outline-variant);
}
#batchDropZone.drag-over {
    border-color: var(--md-primary);
    background: color-mix(in srgb, var(--md-primary) 8%, transparent);
}