:root {
            --primary: #3b82f6;
            --primary-light: #60a5fa;
            --primary-dark: #1d4ed8;
            --accent: #10b981;
            --accent-light: #34d399;
            --accent-dark: #059669;
            --background: #111827;
            --surface: #1f2937;
            --surface-elevated: #0f1729;
            --border: #374151;
            --text: #f3f4f6;
            --text-secondary: #d1d5db;
            --text-muted: #9ca3af;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

        .shape-btn,
        .corner-btn,
        .frame-btn {
            color: var(--text);
        }

        /* Typography enhancements */
        .uppercase {
            letter-spacing: 0.05em;
        }

        /* ── Range inputs ─────────────────────────────────── */
        input[type="range"] {
            -webkit-appearance: none;
            appearance: none;
            height: 5px;
            border-radius: 9999px;
            background: var(--border);
            outline: none;
            transition: background 0.2s;
        }

        input[type="range"]::-webkit-slider-thumb {
            -webkit-appearance: none;
            appearance: none;
            width: 18px;
            height: 18px;
            border-radius: 50%;
            background: var(--primary);
            cursor: pointer;
            border: 2px solid #fff;
            box-shadow: 0 1px 4px rgba(59, 130, 246, 0.4);
            transition: transform 0.15s, box-shadow 0.15s;
        }

        input[type="range"]::-webkit-slider-thumb:hover {
            transform: scale(1.2);
            box-shadow: 0 2px 8px rgba(59, 130, 246, 0.5), 0 0 12px rgba(16, 185, 129, 0.2);
        }

        input[type="range"]::-moz-range-thumb {
            width: 18px;
            height: 18px;
            border-radius: 50%;
            background: var(--primary);
            cursor: pointer;
            border: 2px solid #fff;
        }

        /* ── Accordion ────────────────────────────────────── */
        details>summary {
            list-style: none;
        }

        details>summary::-webkit-details-marker {
            display: none;
        }

        details[open] .acc-chevron {
            transform: rotate(180deg);
        }

        .acc-chevron {
            transition: transform 0.2s ease;
        }

        .acc-body {
            animation: accFade 0.15s ease;
        }

        @keyframes accFade {
            from {
                opacity: 0;
                transform: translateY(-6px);
            }

            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* ── Cursor pointers ────────────────────────────── */
        select,
        input[type="color"],
        input[type="range"],
        [role="switch"],
        button,
        [role="button"] {
            cursor: pointer;
        }

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

        /* ── Custom scrollbar (design panel) ─────────────── */
        .design-content::-webkit-scrollbar {
            width: 4px;
        }

        .design-content::-webkit-scrollbar-track {
            background: transparent;
        }

        .design-content::-webkit-scrollbar-thumb {
            background: #475569;
            border-radius: 9999px;
        }

        /* ── Color inputs ─────────────────────────────────── */
        input[type="color"] {
            padding: 2px;
            border-radius: 6px;
            cursor: pointer;
        }

        /* ── Section icon badges ─────────────────────────── */
        .acc-icon {
            width: 26px;
            height: 26px;
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 13px;
            flex-shrink: 0;
        }

        /* ── Card glow on hover ──────────────────────────── */
        .panel-card {
            transition: box-shadow 0.2s;
        }

        /* ── Button active feedback ──────────────────────── */
        button:active {
            transform: scale(0.97);
        }

        /* ── Smooth focus rings ──────────────────────────── */
        input:focus,
        select:focus,
        button:focus-visible {
            outline: 2px solid #3b82f6;
            outline-offset: 2px;
        }

        /* ── Logo grid drag feedback ─────────────────────── */
        #logoDrop.drag-over {
            border-color: #3b82f6;
            background: rgba(59, 130, 246, 0.07);
        }

        /* ── Template buttons ────────────────────────────── */
        .template-btn {
            transition: all 0.15s ease;
        }

        .template-btn:hover {
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
        }

        .template-btn.selected {
            outline: 2px solid #3b82f6;
            outline-offset: 2px;
        }

        /* ── Gradient toggle pill ────────────────────────── */
        .grad-toggle {
            transition: background 0.2s;
            cursor: pointer;
        }

        .grad-toggle.active {
            background: #3b82f6;
        }

        .grad-thumb {
            transition: transform 0.2s;
        }

        .grad-toggle.active .grad-thumb {
            transform: translateX(16px);
        }

        /* ── QR preview container — JS handles canvas scaling, this just
               ensures the card never stretches beyond its column ── */
        #qrCodeContainer {
            max-width: 100%;
            overflow: hidden;
        }

        /* ── Header animations & styling ───────────────── */
        .logo-icon {
            position: relative;
            overflow: hidden;
        }

        .logo-icon::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, #3b82f6, #8b5cf6, #10b981);
            background-size: 200% 200%;
            animation: gradientShift 6s ease infinite;
            border-radius: 0.75rem;
            z-index: -1;
        }

        @keyframes gradientShift {
            0%,
            100% {
                background-position: 0% 50%;
            }

            50% {
                background-position: 100% 50%;
            }
        }

        .logo-icon svg {
            position: relative;
            z-index: 1;
            filter: drop-shadow(0 0 8px rgba(59, 130, 246, 0.5));
            animation: logoFloat 3s ease-in-out infinite;
        }

        @keyframes logoFloat {
            0%,
            100% {
                transform: translateY(0px);
            }

            50% {
                transform: translateY(-3px);
            }
        }

        .header-title {
            background: linear-gradient(135deg, #ffffff 0%, #60a5fa 50%, #34d399 100%);
            background-size: 200% 200%;
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            animation: gradientFlowText 6s ease infinite;
            font-weight: 800;
            letter-spacing: -0.02em;
        }

        @keyframes gradientFlowText {
            0%,
            100% {
                background-position: 0% 50%;
            }

            50% {
                background-position: 100% 50%;
            }
        }

        .header-subtitle {
            position: relative;
            padding-left: 12px;
        }

        .header-subtitle::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 2px;
            height: 12px;
            background: linear-gradient(135deg, #3b82f6, #10b981);
            border-radius: 1px;
            animation: accentPulse 2s ease-in-out infinite;
        }

        @keyframes accentPulse {
            0%,
            100% {
                opacity: 0.5;
            }

            50% {
                opacity: 1;
            }
        }

        header {
            position: relative;
            padding-bottom: 2px;
        }

        header::after {
            content: '';
            position: absolute;
            bottom: -8px;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.5), transparent);
            animation: shimmer 3s ease infinite;
        }

        @keyframes shimmer {
            0%,
            100% {
                opacity: 0.3;
            }

            50% {
                opacity: 0.7;
            }
        }

        /* ── Responsive Container Layout ────────────────── */
        .main-container {
            flex: 1;
            display: flex;
            flex-direction: column;
            min-height: 0;
        }

        @media (min-width: 1024px) {
            .main-container {
                min-height: calc(100vh - 200px);
            }
        }

        .grid-layout {
            display: grid;
            gap: 1.25rem;
            height: auto;
            min-height: 0;
        }

        @media (max-width: 768px) {
            .grid-layout {
                grid-template-columns: 1fr;
                gap: 1rem;
            }
        }

        @media (min-width: 769px) and (max-width: 1023px) {
            .grid-layout {
                grid-template-columns: 1fr;
                gap: 1.25rem;
            }
        }

        @media (min-width: 1024px) {
            .grid-layout {
                grid-template-columns: 1fr 1fr 1fr;
                gap: 1.5rem;
                height: auto;
            }
        }

        .panel-card {
            display: flex;
            flex-direction: column;
            min-height: 0;
            height: auto;
            max-height: none;
        }

        @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;
            }
        }

        /* ── Content panel scrolling ────────────────────── */
        .design-content {
            flex: 1;
            overflow-y: auto;
            overflow-x: hidden;
            min-height: 0;
        }

        .design-content::-webkit-scrollbar {
            width: 6px;
        }

        .design-content::-webkit-scrollbar-track {
            background: transparent;
        }

        .design-content::-webkit-scrollbar-thumb {
            background: rgba(75, 85, 99, 0.6);
            border-radius: 3px;
        }

        .design-content::-webkit-scrollbar-thumb:hover {
            background: rgba(75, 85, 99, 0.8);
        }

        /* ── 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;
            }
        }

        /* ── Header responsive spacing ──────────────────── */
        @media (max-width: 768px) {
            header {
                margin-bottom: 1.5rem;
            }
        }

        @media (min-width: 769px) {
            header {
                margin-bottom: 2.5rem;
            }
        }

        /* ══ Mobile UX Redesign ══════════════════════════════════ */

        /* Compact header on small phones */
        @media (max-width: 480px) {
            .header-title { font-size: 1.5rem !important; }
            .header-subtitle { display: none !important; }
            header { margin-bottom: 0.5rem !important; }
        }

        /* Hide mobile menu on desktop, show on mobile */
        .hidden-desktop { display: none; }
        @media (max-width: 767px) {
            .hidden-desktop { display: block; }
        }

        /* Hide downloads/share section on mobile (Preview tab has its own buttons) */
        @media (max-width: 767px) {
            .mobile-hidden { display: none !important; }
        }

        /* Bottom padding to clear the fixed tab bar */
        @media (max-width: 767px) {
            .main-container {
                padding-bottom: calc(5.5rem + max(12px, env(safe-area-inset-bottom, 0px)));
            }
            /* Larger touch targets for style picker grids */
            .shape-btn, .corner-btn, .frame-btn, .logo-btn {
                min-height: 44px;
                min-width: 44px;
            }
            /* Easier-to-grab slider thumb */
            input[type="range"]::-webkit-slider-thumb {
                width: 22px;
                height: 22px;
            }
            input[type="range"]::-moz-range-thumb {
                width: 22px;
                height: 22px;
            }
        }

        /* Panel gating: one panel visible at a time on mobile */
        @media (max-width: 767px) {
            .grid-layout > .panel-card { display: none !important; }
            .grid-layout > .panel-card.mobile-active-panel { display: flex !important; }
        }

        /* ── Bottom Tab Bar ──────────────────────────────────── */
        .mobile-tab-bar {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 50;
            background: rgba(17, 24, 39, 0.95);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-top: 1px solid rgba(55, 65, 81, 0.8);
            padding-bottom: max(12px, env(safe-area-inset-bottom, 0px));
        }

        .mobile-tab-bar-inner {
            display: flex;
            height: 60px;
        }

        .mobile-tab-btn {
            flex: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 2px;
            padding: 6px 0;
            background: none;
            border: none;
            cursor: pointer;
            color: var(--text-muted);
            font-size: 10px;
            font-weight: 600;
            letter-spacing: 0.05em;
            text-transform: uppercase;
            touch-action: manipulation;
            -webkit-tap-highlight-color: transparent;
            transition: color 0.15s;
            position: relative;
        }

        .mobile-tab-btn svg {
            width: 20px;
            height: 20px;
            flex-shrink: 0;
            margin-bottom: 1px;
        }

        .mobile-tab-btn.tab-active { color: var(--primary); }

        .mobile-tab-btn .tab-indicator {
            position: absolute;
            top: 3px;
            left: 50%;
            transform: translateX(-50%);
            width: 24px;
            height: 2px;
            border-radius: 9999px;
            background: var(--primary);
            opacity: 0;
            transition: opacity 0.15s;
        }

        .mobile-tab-btn.tab-active .tab-indicator { opacity: 1; }

        /* Preview tab update badge */
        .mobile-tab-btn.tab-badge::after {
            content: '';
            position: absolute;
            top: 7px;
            right: calc(50% - 17px);
            width: 7px;
            height: 7px;
            background: var(--primary);
            border-radius: 50%;
            border: 1.5px solid #111827;
            animation: badge-pop 0.25s ease;
        }

        @keyframes badge-pop {
            from { transform: scale(0); }
            60%  { transform: scale(1.4); }
            to   { transform: scale(1); }
        }

        /* ── Floating Live QR Chip ───────────────────────────── */
        .mobile-qr-chip {
            display: none;
            position: fixed;
            top: 4.5rem;
            right: 1rem;
            z-index: 38;
            width: 90px;
            height: 90px;
            background: rgba(17, 24, 39, 0.9);
            border: 1.5px solid rgba(59, 130, 246, 0.5);
            border-radius: 14px;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
            cursor: pointer;
            overflow: hidden;
            -webkit-tap-highlight-color: transparent;
            transition: transform 0.12s;
        }

        .mobile-qr-chip:active { transform: scale(0.9); }

        .mobile-qr-chip img {
            width: 100%;
            height: 100%;
            object-fit: contain;
            padding: 4px;
            display: block;
        }

        .mobile-qr-chip.chip-pulse { animation: chip-pulse-anim 0.4s ease; }

        @keyframes chip-pulse-anim {
            0%   { box-shadow: 0 4px 16px rgba(0,0,0,0.4), 0 0 0 0   rgba(59,130,246,0.7); }
            50%  { box-shadow: 0 4px 20px rgba(0,0,0,0.5), 0 0 0 8px  rgba(59,130,246,0.1); }
            100% { box-shadow: 0 4px 16px rgba(0,0,0,0.4), 0 0 0 0   rgba(59,130,246,0); }
        }

        /* ── Mobile Download Row inside Preview Panel ────────── */
        .mobile-preview-actions {
            display: none;
            width: 100%;
            flex-direction: column;
            gap: 0;
            margin-top: 1rem;
            padding-top: 1rem;
            border-top: 1px solid rgba(75, 85, 99, 0.4);
        }

        /* Activate all mobile-specific elements on phones */
        @media (max-width: 767px) {
            .mobile-tab-bar          { display: block; }
            .mobile-qr-chip          { display: block; }
            .mobile-preview-actions  { display: flex; }
        }

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

        #advancedModal.visible {
            opacity: 1 !important;
        }

        /* ── Toast notification system ───────────────────────────── */
        #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: 9px 18px;
            border-radius: 999px;
            font-size: 13px;
            font-weight: 600;
            color: #fff;
            box-shadow: 0 4px 20px rgba(0,0,0,0.4);
            white-space: nowrap;
            pointer-events: all;
            max-width: calc(100vw - 32px);
            animation: toastIn 0.3s ease, toastOut 0.3s ease 2.7s forwards;
        }
        .toast-success { background: linear-gradient(135deg,#10b981,#059669); }
        .toast-error   { background: linear-gradient(135deg,#ef4444,#dc2626); }
        .toast-info    { background: linear-gradient(135deg,#3b82f6,#2563eb); }
        .toast-warn    { background: linear-gradient(135deg,#f59e0b,#d97706); color: #111; }
        @keyframes toastIn {
            from { opacity:0; transform:translateY(14px) scale(0.9); }
            to   { opacity:1; transform:translateY(0) scale(1); }
        }
        @keyframes toastOut {
            from { opacity:1; transform:translateY(0) scale(1); }
            to   { opacity:0; transform:translateY(-8px) scale(0.95); }
        }

        /* ── Onboarding welcome banner ───────────────────────────── */
        #onboardingBanner {
            animation: bannerFadeIn 0.4s ease;
        }
        @keyframes bannerFadeIn {
            from { opacity:0; transform:translateY(-8px); }
            to   { opacity:1; transform:translateY(0); }
        }

        /* ── Inline field validation ─────────────────────────────── */
        .field-input-error {
            border-color: #ef4444 !important;
            box-shadow: 0 0 0 2px rgba(239,68,68,0.15);
        }
        .field-error-msg {
            display: none;
            align-items: center;
            gap: 4px;
            color: #f87171;
            font-size: 11px;
            margin-top: 5px;
        }

        /* ── Mobile "Preview my QR" CTA 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: 15px 20px;
                background: linear-gradient(135deg,#2563eb,#1d4ed8);
                color: white;
                font-weight: 700;
                font-size: 15px;
                border-radius: 16px;
                border: none;
                box-shadow: 0 4px 16px rgba(37,99,235,0.35);
                touch-action: manipulation;
                -webkit-tap-highlight-color: transparent;
                margin-bottom: 4px;
                transition: transform 0.1s, box-shadow 0.15s;
            }
            .mobile-next-btn:active {
                transform: scale(0.97);
                box-shadow: 0 2px 8px rgba(37,99,235,0.3);
            }
        }

        /* ── Advanced feature badge ──────────────────────────────── */
        .adv-badge {
            display: inline-block;
            font-size: 9px;
            font-weight: 700;
            letter-spacing: 0.07em;
            text-transform: uppercase;
            background: rgba(139,92,246,0.15);
            color: #a78bfa;
            border: 1px solid rgba(139,92,246,0.3);
            border-radius: 4px;
            padding: 1px 5px;
            margin-left: 5px;
            vertical-align: middle;
            line-height: 1.4;
        }

        /* ── Help (?) button ─────────────────────────────────────── */
        .help-btn {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: rgba(59,130,246,0.12);
            border: 1px solid rgba(59,130,246,0.3);
            color: #60a5fa;
            font-size: 13px;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            transition: background 0.15s, border-color 0.15s;
        }
        .help-btn:hover {
            background: rgba(59,130,246,0.22);
            border-color: rgba(59,130,246,0.55);
        }

        /* ── History ─────────────────────────────────────────────── */
        #historyDrawer {
            position: fixed;
            top: 0; right: 0;
            height: 100%;
            width: 300px;
            background: #1a2130;
            border-left: 1px solid rgba(255,255,255,0.08);
            box-shadow: -8px 0 32px rgba(0,0,0,0.45);
            z-index: 60;
            display: flex;
            flex-direction: column;
            transform: translateX(100%);
            transition: transform 0.28s cubic-bezier(0.4,0,0.2,1);
            will-change: transform;
        }
        #historyDrawer.open { transform: translateX(0); }
        #historyOverlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.5);
            z-index: 59;
            backdrop-filter: blur(2px);
        }
        #historyOverlay.open { display: block; }

        .history-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 14px 14px 10px;
            border-bottom: 1px solid rgba(255,255,255,0.07);
            flex-shrink: 0;
        }
        .history-header h2 {
            font-size: 12px;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.09em;
            color: #9ca3af;
        }
        .history-close-btn {
            width: 26px; height: 26px;
            border-radius: 7px;
            background: transparent;
            border: none;
            color: #6b7280;
            display: flex; align-items: center; justify-content: center;
            cursor: pointer;
            transition: background 0.13s, color 0.13s;
        }
        .history-close-btn:hover { background: rgba(255,255,255,0.08); color: #e5e7eb; }

        .history-body {
            flex: 1;
            overflow-y: auto;
            padding: 10px 10px 16px;
            scrollbar-width: thin;
            scrollbar-color: #374151 transparent;
        }
        .history-section-label {
            font-size: 10px;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.1em;
            color: #4b5563;
            padding: 6px 4px 5px;
        }
        .history-empty {
            text-align: center;
            color: #4b5563;
            font-size: 12px;
            padding: 32px 12px;
            line-height: 1.7;
        }
        .history-card {
            display: flex;
            align-items: center;
            gap: 9px;
            padding: 7px 8px;
            border-radius: 11px;
            cursor: pointer;
            transition: background 0.13s;
            border: 1px solid transparent;
            margin-bottom: 3px;
        }
        .history-card:hover { background: rgba(255,255,255,0.05); border-color: rgba(255,255,255,0.06); }
        .history-thumb {
            width: 46px; height: 46px;
            border-radius: 8px;
            object-fit: cover;
            background: #111827;
            flex-shrink: 0;
            border: 1px solid rgba(255,255,255,0.08);
        }
        .history-info { flex: 1; min-width: 0; }
        .history-name {
            font-size: 12px;
            font-weight: 600;
            color: #e5e7eb;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            display: block;
            outline: none;
            border-radius: 4px;
            padding: 1px 3px;
            margin-left: -3px;
            cursor: text;
        }
        .history-name:focus {
            background: rgba(59,130,246,0.15);
            white-space: normal;
            overflow: visible;
            text-overflow: clip;
        }
        .history-time { font-size: 10px; color: #6b7280; margin-top: 1px; }
        .history-actions { display: flex; gap: 1px; flex-shrink: 0; }
        .history-action-btn {
            width: 26px; height: 26px;
            border-radius: 6px;
            background: transparent;
            border: none;
            display: flex; align-items: center; justify-content: center;
            cursor: pointer;
            transition: background 0.12s, color 0.12s;
            color: #6b7280;
        }
        .history-action-btn:hover { background: rgba(255,255,255,0.08); color: #e5e7eb; }
        .history-action-btn.starred { color: #fbbf24; }
        .history-action-btn.delete-btn:hover { background: rgba(239,68,68,0.12); color: #f87171; }

        .save-snapshot-btn {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            width: 100%;
            padding: 10px 12px;
            border-radius: 10px;
            font-size: 14px;
            font-weight: 600;
            color: #fff;
            background: linear-gradient(135deg, #0d9488 0%, #0891b2 100%);
            box-shadow: 0 2px 8px rgba(13, 148, 136, 0.25);
            border: none;
            cursor: pointer;
            transition: filter 0.15s, box-shadow 0.15s, transform 0.1s;
            text-align: center;
        }
        .save-snapshot-btn:hover { filter: brightness(1.1); box-shadow: 0 4px 14px rgba(13,148,136,0.35); }
        .save-snapshot-btn:active { transform: scale(0.97); }
        .save-snapshot-btn svg { flex-shrink: 0; color: #fff; }

        /* ── Desktop Download Buttons ────────────────────────── */
        .desktop-download-btn {
            position: relative;
            overflow: hidden;
            border: none;
            cursor: pointer;
            touch-action: manipulation;
            -webkit-tap-highlight-color: transparent;
            will-change: transform, filter, box-shadow;
        }

        .desktop-download-btn::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, transparent 0%, rgba(255, 255, 255, 0.2) 50%, transparent 100%);
            transform: translateX(-100%);
            transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
            pointer-events: none;
        }

        .desktop-download-btn:hover {
            filter: brightness(1.2);
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5) !important;
            transform: translateY(-2px);
        }

        .desktop-download-btn:hover::before {
            transform: translateX(100%);
        }

        .desktop-download-btn:active {
            filter: brightness(0.9);
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4) !important;
        }

        .desktop-download-btn:focus-visible {
            outline: 2px solid rgba(255, 255, 255, 0.6);
            outline-offset: 3px;
        }

        .history-toggle-btn {
            width: 28px; height: 28px;
            border-radius: 50%;
            background: rgba(139,92,246,0.12);
            border: 1px solid rgba(139,92,246,0.3);
            color: #a78bfa;
            display: flex; align-items: center; justify-content: center;
            flex-shrink: 0;
            cursor: pointer;
            transition: background 0.15s, border-color 0.15s;
            position: relative;
        }
        .history-toggle-btn:hover { background: rgba(139,92,246,0.22); border-color: rgba(139,92,246,0.5); }
        .history-toggle-btn.active { background: rgba(139,92,246,0.3); border-color: rgba(139,92,246,0.7); }
        .history-badge {
            position: absolute;
            top: -4px; right: -4px;
            width: 14px; height: 14px;
            border-radius: 50%;
            background: #8b5cf6;
            color: white;
            font-size: 8px;
            font-weight: 700;
            display: flex; align-items: center; justify-content: center;
            border: 1.5px solid #111827;
            pointer-events: none;
        }

        @media (max-width: 767px) {
            #historyDrawer {
                top: auto; bottom: 0;
                left: 0; right: 0;
                width: 100%;
                height: 72vh;
                border-left: none;
                border-top: 1px solid rgba(255,255,255,0.1);
                border-radius: 20px 20px 0 0;
                box-shadow: 0 -8px 32px rgba(0,0,0,0.55);
                transform: translateY(100%);
            }
            #historyDrawer.open { transform: translateY(0); }
            .history-body { padding-bottom: 28px; }
        }