:root {
            --bg:        #0b0c0a;
            --bg2:       #111310;
            --bg3:       #161814;
            --amber:     #ffb000;
            --amber-dim: #7a5500;
            --amber-glow:#ffb00033;
            --green:     #39ff14;
            --green-dim: #1a7a00;
            --red:       #ff4444;
            --blue:      #00aaff;
            --border:    rgba(255,176,0,0.15);
            --border-active: rgba(255,176,0,0.6);
            --text:      #e8dfc0;
            --muted:     #5a5540;
            --mono:      'JetBrains Mono', monospace;
            --display:   'Orbitron', monospace;
        }

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

        html { scroll-behavior: smooth; }

        body {
            background: var(--bg);
            color: var(--text);
            font-family: var(--mono);
            min-height: 100vh;
            overflow-x: hidden;
            cursor: crosshair;
        }

        /* ── SCANLINE OVERLAY ── */
        body::after {
            content: '';
            position: fixed;
            inset: 0;
            background: repeating-linear-gradient(
                0deg,
                transparent,
                transparent 2px,
                rgba(0,0,0,0.08) 2px,
                rgba(0,0,0,0.08) 4px
            );
            pointer-events: none;
            z-index: 9999;
        }

        /* ── BACKGROUND CANVAS ── */
        #bgCanvas {
            position: fixed;
            inset: 0;
            width: 100%;
            height: 100%;
            z-index: 0;
            opacity: 0.4;
        }

        /* ── PENGUIN SVG BG ── */
        .penguin-bg {
            position: fixed;
            right: -60px;
            bottom: -40px;
            width: 420px;
            opacity: 0.04;
            z-index: 0;
            pointer-events: none;
            filter: sepia(1) saturate(0) brightness(3);
        }

        /* ── LAYOUT ── */
        .wrapper {
            position: relative;
            z-index: 1;
            max-width: 1100px;
            margin: 0 auto;
            padding: 0 20px 80px;
        }

        /* ── HEADER ── */
        header {
            padding: 30px 0 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            border-bottom: 1px solid var(--border);
            margin-bottom: 40px;
        }

        .brand {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .brand-penguin {
            width: 52px;
            height: 52px;
            flex-shrink: 0;
        }

        .brand-text h1 {
            font-family: var(--display);
            font-size: 22px;
            font-weight: 900;
            color: var(--amber);
            letter-spacing: 2px;
            text-shadow: 0 0 20px var(--amber-glow);
            line-height: 1;
        }

        .brand-text p {
            font-size: 11px;
            color: var(--muted);
            letter-spacing: 1px;
            margin-top: 4px;
        }

        .header-status {
            display: flex;
            align-items: center;
            gap: 20px;
        }

        .status-item {
            font-size: 11px;
            color: var(--muted);
            letter-spacing: 1px;
        }

        .status-item span {
            color: var(--green);
        }

        /* ── MAIN EXPRESSION DISPLAY ── */
        .expression-hero {
            background: var(--bg2);
            border: 1px solid var(--border-active);
            border-radius: 4px;
            padding: 28px 32px;
            margin-bottom: 30px;
            position: relative;
            box-shadow: 0 0 40px rgba(255,176,0,0.06), inset 0 0 60px rgba(0,0,0,0.3);
        }

        .expression-hero::before {
            content: '// CRON EXPRESSION';
            position: absolute;
            top: -10px;
            left: 20px;
            background: var(--bg);
            padding: 0 10px;
            font-size: 10px;
            color: var(--amber-dim);
            letter-spacing: 2px;
        }

        .expression-main {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        .expr-field {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 6px;
        }

        .expr-value {
            font-family: var(--display);
            font-size: clamp(24px, 4vw, 40px);
            font-weight: 900;
            color: var(--amber);
            text-shadow: 0 0 30px rgba(255,176,0,0.5);
            min-width: 60px;
            text-align: center;
            transition: all 0.2s;
            cursor: default;
        }

        .expr-value:hover {
            text-shadow: 0 0 50px rgba(255,176,0,0.9);
            transform: scale(1.05);
        }

        .expr-label {
            font-size: 9px;
            color: var(--muted);
            letter-spacing: 2px;
            text-transform: uppercase;
        }

        .expr-sep {
            font-family: var(--display);
            font-size: 30px;
            color: var(--amber-dim);
            margin-bottom: 18px;
            user-select: none;
        }

        .expression-actions {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-left: auto;
        }

        .btn {
            font-family: var(--mono);
            font-size: 12px;
            padding: 10px 18px;
            border-radius: 3px;
            border: none;
            cursor: pointer;
            letter-spacing: 1px;
            transition: all 0.2s;
            font-weight: 600;
        }

        .btn-amber {
            background: var(--amber);
            color: #000;
        }

        .btn-amber:hover {
            background: #ffd060;
            box-shadow: 0 0 20px rgba(255,176,0,0.5);
            transform: translateY(-1px);
        }

        .btn-ghost {
            background: transparent;
            color: var(--amber);
            border: 1px solid var(--border-active);
        }

        .btn-ghost:hover {
            background: var(--amber-glow);
            box-shadow: 0 0 15px rgba(255,176,0,0.2);
        }

        .btn-green {
            background: transparent;
            color: var(--green);
            border: 1px solid rgba(57,255,20,0.3);
        }

        .btn-green:hover {
            background: rgba(57,255,20,0.1);
            box-shadow: 0 0 15px rgba(57,255,20,0.2);
        }

        /* ── HUMAN READABLE ── */
        .human-readable {
            background: rgba(57,255,20,0.04);
            border: 1px solid rgba(57,255,20,0.15);
            border-radius: 3px;
            padding: 14px 20px;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .human-readable-icon {
            font-size: 16px;
            flex-shrink: 0;
        }

        .human-readable-text {
            font-size: 14px;
            color: var(--green);
            letter-spacing: 0.5px;
        }

        /* ── NEXT RUNS ── */
        .next-runs {
            background: var(--bg2);
            border: 1px solid var(--border);
            border-radius: 3px;
            padding: 16px 20px;
            margin-bottom: 30px;
        }

        .next-runs-title {
            font-size: 10px;
            color: var(--muted);
            letter-spacing: 2px;
            margin-bottom: 10px;
        }

        .next-runs-list {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }

        .next-run-item {
            background: var(--bg3);
            border: 1px solid var(--border);
            border-radius: 3px;
            padding: 6px 12px;
            font-size: 11px;
            color: var(--blue);
            font-family: var(--mono);
            transition: all 0.2s;
        }

        .next-run-item:hover {
            border-color: var(--blue);
            box-shadow: 0 0 10px rgba(0,170,255,0.2);
        }

        /* ── GRID LAYOUT ── */
        .builder-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
            margin-bottom: 16px;
        }

        @media (max-width: 700px) {
            .builder-grid { grid-template-columns: 1fr; }
        }

        /* ── SECTION PANELS ── */
        .panel {
            background: var(--bg2);
            border: 1px solid var(--border);
            border-radius: 4px;
            padding: 22px;
            transition: border-color 0.3s;
            position: relative;
        }

        .panel:hover {
            border-color: rgba(255,176,0,0.3);
        }

        .panel-mb {
            margin-bottom: 16px;
        }

        .panel.active {
            border-color: var(--border-active);
            box-shadow: 0 0 20px rgba(255,176,0,0.05);
        }

        .panel-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 18px;
        }

        .panel-title {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 11px;
            letter-spacing: 2px;
            color: var(--amber);
            text-transform: uppercase;
        }

        .panel-title-num {
            font-family: var(--display);
            font-size: 18px;
            font-weight: 900;
            color: var(--amber);
            opacity: 0.3;
        }

        .panel-value-badge {
            font-family: var(--display);
            font-size: 14px;
            font-weight: 700;
            color: var(--amber);
            background: var(--amber-glow);
            border: 1px solid var(--border-active);
            padding: 4px 12px;
            border-radius: 3px;
        }

        /* ── MODE TABS ── */
        .mode-tabs {
            display: flex;
            gap: 4px;
            margin-bottom: 18px;
        }

        .mode-tab {
            font-family: var(--mono);
            font-size: 11px;
            padding: 6px 14px;
            background: transparent;
            color: var(--muted);
            border: 1px solid var(--border);
            border-radius: 2px;
            cursor: pointer;
            letter-spacing: 1px;
            transition: all 0.2s;
        }

        .mode-tab.active {
            background: var(--amber-glow);
            color: var(--amber);
            border-color: var(--border-active);
        }

        .mode-tab:hover:not(.active) {
            color: var(--text);
            border-color: rgba(255,176,0,0.3);
        }

        /* ── MODE CONTENT ── */
        .mode-content { display: none; }
        .mode-content.active { display: block; }

        /* Every X input */
        .every-wrap {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .every-label {
            font-size: 12px;
            color: var(--muted);
            letter-spacing: 1px;
        }

        .every-label-confirm {
            font-size: 13px;
            color: var(--green);
        }

        .num-input {
            font-family: var(--mono);
            font-size: 16px;
            font-weight: 700;
            color: var(--amber);
            background: var(--bg3);
            border: 1px solid var(--border-active);
            border-radius: 3px;
            padding: 8px 14px;
            width: 80px;
            outline: none;
            text-align: center;
            transition: all 0.2s;
        }

        .num-input:focus {
            box-shadow: 0 0 15px rgba(255,176,0,0.3);
        }

        /* Range inputs */
        .range-wrap {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .range-sep {
            color: var(--muted);
            font-size: 12px;
        }

        /* Specific toggles */
        .toggle-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
        }

        .toggle-chip {
            font-family: var(--mono);
            font-size: 12px;
            font-weight: 600;
            padding: 6px 10px;
            background: var(--bg3);
            border: 1px solid var(--border);
            border-radius: 3px;
            cursor: pointer;
            transition: all 0.15s;
            color: var(--muted);
            user-select: none;
            min-width: 36px;
            text-align: center;
        }

        .toggle-chip:hover {
            border-color: rgba(255,176,0,0.4);
            color: var(--text);
        }

        .toggle-chip.on {
            background: var(--amber-glow);
            border-color: var(--amber);
            color: var(--amber);
            text-shadow: 0 0 10px rgba(255,176,0,0.5);
        }

        /* Select all / none */
        .chip-actions {
            display: flex;
            gap: 8px;
            margin-bottom: 10px;
        }

        .chip-action-btn {
            font-family: var(--mono);
            font-size: 10px;
            padding: 3px 8px;
            background: transparent;
            color: var(--muted);
            border: 1px solid var(--border);
            border-radius: 2px;
            cursor: pointer;
            letter-spacing: 1px;
            transition: all 0.15s;
        }

        .chip-action-btn:hover {
            color: var(--amber);
            border-color: var(--amber-dim);
        }

        /* ── FULL WIDTH PANELS ── */
        .panel-full {
            grid-column: 1 / -1;
        }

        /* ── PRESETS SECTION ── */
        .presets-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 10px;
        }

        .preset-card {
            background: var(--bg3);
            border: 1px solid var(--border);
            border-radius: 3px;
            padding: 14px 16px;
            cursor: pointer;
            transition: all 0.2s;
        }

        .preset-card:hover {
            border-color: var(--amber);
            background: var(--amber-glow);
            transform: translateY(-2px);
            box-shadow: 0 4px 20px rgba(255,176,0,0.1);
        }

        .preset-expr {
            font-family: var(--display);
            font-size: 13px;
            color: var(--amber);
            font-weight: 700;
            margin-bottom: 6px;
            letter-spacing: 1px;
        }

        .preset-name {
            font-size: 12px;
            color: var(--text);
            margin-bottom: 3px;
            font-weight: 600;
        }

        .preset-desc {
            font-size: 11px;
            color: var(--muted);
        }

        /* ── MANUAL INPUT ── */
        .manual-section {
            background: var(--bg2);
            border: 1px solid var(--border);
            border-radius: 4px;
            padding: 22px;
            margin-bottom: 16px;
        }

        .manual-title {
            font-size: 10px;
            color: var(--muted);
            letter-spacing: 2px;
            margin-bottom: 12px;
        }

        .manual-input-wrap {
            display: flex;
            gap: 10px;
        }

        .manual-input {
            flex: 1;
            font-family: var(--display);
            font-size: 18px;
            font-weight: 700;
            color: var(--amber);
            background: var(--bg3);
            border: 1px solid var(--border-active);
            border-radius: 3px;
            padding: 12px 16px;
            outline: none;
            letter-spacing: 3px;
            transition: all 0.2s;
        }

        .manual-input:focus {
            box-shadow: 0 0 20px rgba(255,176,0,0.2);
        }

        .manual-input.invalid {
            border-color: var(--red);
            color: var(--red);
        }

        /* ── VALIDATION ── */
        .validation-bar {
            margin-top: 10px;
            font-size: 11px;
            display: flex;
            align-items: center;
            gap: 8px;
            min-height: 20px;
        }

        .valid-ok { color: var(--green); }
        .valid-err { color: var(--red); }

        /* ── REFERENCE TABLE ── */
        .ref-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 12px;
        }

        .ref-table th {
            text-align: left;
            padding: 8px 12px;
            color: var(--amber);
            font-size: 10px;
            letter-spacing: 2px;
            border-bottom: 1px solid var(--border);
        }

        .ref-table td {
            padding: 8px 12px;
            border-bottom: 1px solid rgba(255,176,0,0.05);
            color: var(--text);
            font-size: 12px;
        }

        .ref-table tr:hover td {
            background: var(--amber-glow);
        }

        .ref-table .mono-val {
            font-family: var(--mono);
            color: var(--amber);
            font-size: 11px;
        }

        /* ===== FOOTER ===== */
        footer {
            margin-top: 100px;
            padding: 60px 0 40px;
            border-top: 1px solid var(--border);
            text-align: center;
        }

        .footer-content {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 16px;
            margin-bottom: 30px;
        }

        .footer-links a {
            text-decoration: none;
            color: inherit;
            font-family: 'Space Mono', monospace;
            font-size: 0.75rem;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            opacity: 0.7;
            transition: opacity 0.2s;
        }

        .footer-links a:hover {
            opacity: 1;
            color: #e8f542;
        }

        .footer-links {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 4px 0;
            align-items: center;
        }

        .footer-links a:not(:last-child)::after {
            content: '|';
            margin: 0 0.6em;
            opacity: 0.3;
            color: inherit;
        }

        /* ── COPY TOAST ── */
        .toast {
            position: fixed;
            bottom: 30px;
            left: 50%;
            transform: translateX(-50%) translateY(20px);
            background: var(--amber);
            color: #000;
            font-family: var(--mono);
            font-size: 12px;
            font-weight: 700;
            letter-spacing: 2px;
            padding: 12px 24px;
            border-radius: 3px;
            z-index: 10000;
            opacity: 0;
            transition: all 0.3s;
            pointer-events: none;
        }

        .toast.show {
            opacity: 1;
            transform: translateX(-50%) translateY(0);
        }

        /* ── ANIMATIONS ── */
        .fade-in {
            opacity: 0;
            transform: translateY(10px);
            animation: fadeUp 0.4s forwards;
        }

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

        .delay-1 { animation-delay: 0.05s; }
        .delay-2 { animation-delay: 0.1s; }
        .delay-3 { animation-delay: 0.15s; }
        .delay-4 { animation-delay: 0.2s; }
        .delay-5 { animation-delay: 0.25s; }

        /* ── RESPONSIVE ── */
        @media (max-width: 600px) {
            .expression-main { gap: 8px; }
            .expr-value { font-size: 22px; min-width: 40px; }
            .expr-sep { font-size: 20px; }
            .expression-actions { flex-direction: column; width: 100%; }
            .manual-input { font-size: 14px; letter-spacing: 2px; }
            header { flex-direction: column; gap: 16px; }
            .presets-grid { grid-template-columns: 1fr 1fr; }
        }

        /* custom scrollbar */
        ::-webkit-scrollbar { width: 6px; }
        ::-webkit-scrollbar-track { background: var(--bg); }
        ::-webkit-scrollbar-thumb { background: var(--amber-dim); border-radius: 3px; }
        ::-webkit-scrollbar-thumb:hover { background: var(--amber); }