@keyframes pulse {
            0%, 100% {
                box-shadow: 0 0 0 0 rgba(245, 158, 11, 0.7);
            }
            50% {
                box-shadow: 0 0 0 8px rgba(245, 158, 11, 0);
            }
        }

        @font-face {
            font-family: "RoadgeekUS";
            src: url("fonts/Roadgeek.woff2") format("woff2");
            font-weight: normal;
            font-style: normal;
            font-display: swap;
        }

        * { box-sizing: border-box; }

        body {
            font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
            max-width: 900px;
            margin: 0 auto;
            padding: 0 0 80px;
            line-height: 1.5;
            background: #ffffff;
        }

        /* ===== TAB BAR ===== */
        .tab-bar {
            position: sticky;
            top: 0;
            z-index: 100;
            display: flex;
            background: #ffffff;
            border-bottom: 1px solid #e5e7eb;
            padding: 0;
        }
        .tab-bar-item {
            flex: 1;
            text-align: center;
            padding: 12px 0 10px;
            font-size: 0.85rem;
            font-weight: 500;
            color: #9ca3af;
            cursor: pointer;
            border-bottom: 3px solid transparent;
            transition: color 0.2s, border-color 0.2s;
            background: none;
            border-top: none;
            border-left: none;
            border-right: none;
            -webkit-tap-highlight-color: transparent;
        }
        .tab-bar-item.active {
            color: #9370db;
            border-bottom-color: #9370db;
            font-weight: 600;
        }

        /* ===== TAB CONTENT ===== */
        .tab-content {
            display: none;
            padding: 16px;
        }
        .tab-content.active {
            display: block;
        }

        /* ===== GAME TAB ===== */
        .game-title {
            text-align: center;
            font-size: 1.8rem;
            font-weight: 800;
            margin: 8px 0 16px;
            letter-spacing: -0.5px;
        }

        .mode-buttons {
            display: flex;
            flex-direction: row;
            gap: 8px;
            justify-content: center;
            margin-bottom: 12px;
        }
        .mode-btn {
            flex: 1;
            max-width: 180px;
            padding: 10px 12px;
            font-size: 0.9rem;
            font-weight: 700;
            border: none;
            border-radius: 10px;
            cursor: pointer;
            transition: filter 0.2s;
        }
        .mode-btn:hover { filter: brightness(0.92); }
        #dailyChallengeBtn {
            background: #fbbf24;
            color: #92400e;
        }
        #practiceBtn {
            background: #e9d5ff;
            color: #6b21a8;
        }
        #rulesBtn {
            background: #f3f4f6;
            color: #6b7280;
            font-weight: 600;
        }

        .game-layout {
            display: flex;
            gap: 24px;
            align-items: flex-start;
        }
        .game-left {
            flex: 0 0 55%;
        }
        .game-right {
            flex: 1;
        }
        @media (max-width: 700px) {
            .game-layout {
                flex-direction: column;
            }
        }

        .car-wrapper {
            position: relative;
            display: block;
            width: 100%;
            max-width: 360px;
            height: 380px;
            overflow: hidden;
        }

        .car-image {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .plate-text {
            position: absolute;
            left: 52%;
            bottom: 8.5%;
            transform: translateX(-50%);
            font-family: "RoadgeekUS", sans-serif;
            font-size: 3.5rem;
            letter-spacing: 0.33em;
            color: #222;
            font-weight: 600;
            text-transform: uppercase;
            text-shadow: 0 1px 2px rgba(0,0,0,0.35);
            pointer-events: none;
        }

        .difficulty {
            margin-top: 8px;
            font-size: 1.1rem;
            font-weight: 600;
            text-align: center;
        }

        .diff-easy { color: #16a34a; }
        .diff-med  { color: #d97706; }
        .diff-hard { color: #dc2626; }

        /* Timer row */
        #timerRow {
            display: flex;
            justify-content: space-between;
            align-items: baseline;
            margin: 12px 0 8px;
            font-weight: 600;
            font-size: 0.95rem;
            padding: 8px 12px;
            background: #f9fafb;
            border-radius: 10px;
        }
        #timerDisplay { color: #111827; }
        #progressDisplay { color: #374151; }

        .controls {
            margin: 16px 0 12px;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .controls input[type="text"] {
            width: 100%;
            padding: 12px;
            font-size: 16px;
            border: 2px solid #e5e7eb;
            border-radius: 10px;
        }

        .controls .button-row {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }

        button {
            padding: 8px 14px;
            font-size: 0.95rem;
            cursor: pointer;
            border-radius: 8px;
        }

        button:disabled {
            opacity: 0.6;
            cursor: default;
        }

        #startButton { }
        #chartButton {
            margin-top: 8px;
            padding: 6px 12px;
            font-size: 0.85rem;
            display: none;
        }

        #result {
            margin-top: 10px;
            font-weight: 600;
        }

        #debug {
            margin-top: 6px;
            font-size: 0.85rem;
            color: #6b7280;
        }

        /* Solved plates card */
        .solved-card {
            background: #ffffff;
            border: 1px solid #e5e7eb;
            border-radius: 14px;
            padding: 16px;
            margin-top: 16px;
        }
        .solved-card h3 {
            margin: 0 0 8px;
            font-size: 1rem;
        }

        table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.95rem;
        }

        th, td {
            border-bottom: 1px solid #e5e7eb;
            padding: 6px 8px;
            text-align: left;
        }

        th {
            background-color: #f3f4f6;
            font-weight: 600;
        }

        tr:nth-child(even) td {
            background-color: #f9fafb;
        }

        .history-empty {
            font-size: 0.85rem;
            color: #6b7280;
            margin-top: 4px;
        }

        .plate-letter-highlight {
            color: #16a34a;
            font-weight: 700;
        }

        .clickable-plate {
            cursor: pointer;
            text-decoration: underline;
            text-decoration-style: dotted;
        }

        .clickable-plate:hover {
            text-decoration-style: solid;
        }

        /* Floating labels */
        .float-label {
            position: fixed;
            transform: translate(-50%, -50%);
            z-index: 999;
            pointer-events: none;
            background: rgba(255,255,255,0.95);
            padding: 3px 6px;
            border-radius: 4px;
            box-shadow: 0 2px 6px rgba(0,0,0,0.25);
            opacity: 1;
            transition:
                top 0.4s ease-out,
                left 0.4s ease-out,
                opacity 0.4s ease-out;
            white-space: nowrap;
            font-size: 0.9rem;
        }

        .float-label-plate {
            font-size: 1.1rem;
            letter-spacing: 0.3em;
            font-weight: 600;
        }

        .float-label-word {
            font-weight: 600;
        }

        .float-label-diff {
            font-size: 0.8rem;
            font-weight: 700;
        }

        /* Modal base styles */
        .modal-backdrop {
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.45);
            display: none;
            align-items: center;
            justify-content: center;
            z-index: 900;
        }

        #gameModalBackdrop { z-index: 900; }
        #chartModalBackdrop { z-index: 950; }
        #wordsModalBackdrop { z-index: 1000; }

        .modal-backdrop.show {
            display: flex;
        }

        .modal {
            background: #ffffff;
            border-radius: 14px;
            max-width: 500px;
            width: 95%;
            max-height: 80vh;
            box-shadow: 0 10px 30px rgba(0,0,0,0.25);
            display: flex;
            flex-direction: column;
            overflow: hidden;
        }

        .modal-header {
            padding: 10px 14px;
            border-bottom: 1px solid #e5e7eb;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: #f3f4f6;
        }

        .modal-title {
            font-weight: 600;
            font-size: 1rem;
        }

        .modal-body {
            padding: 10px 14px;
            overflow-y: auto;
            font-size: 0.95rem;
        }

        #wordsModalBackdrop .modal,
        #runDetailsModalBackdrop .modal {
            max-width: 500px;
            height: 80vh;
        }
        #wordsModalBackdrop .modal-body,
        #runDetailsModalBackdrop .modal-body {
            flex: 1;
            overflow-y: auto;
        }

        .modal-footer {
            padding: 8px 14px;
            border-top: 1px solid #e5e7eb;
            text-align: right;
            display: flex;
            justify-content: flex-end;
            gap: 8px;
        }

        .modal-close-btn {
            border: none;
            background: transparent;
            font-size: 1.1rem;
            cursor: pointer;
        }

        .words-list {
            font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
            white-space: normal;
        }

        .words-list-item {
            display: block;
            margin-bottom: 2px;
        }

        .words-sort-controls {
            display: flex;
            align-items: center;
            gap: 6px;
            margin-bottom: 6px;
            font-size: 0.85rem;
        }

        .words-sort-label {
            color: #6b7280;
        }

        .words-sort-button {
            padding: 2px 8px;
            font-size: 0.8rem;
            border-radius: 9999px;
            border: 1px solid #d1d5db;
            background: #f9fafb;
            cursor: pointer;
        }

        .words-sort-button.active {
            background: #111827;
            color: #ffffff;
            border-color: #111827;
        }

        #resultsChart {
            width: 100%;
            min-height: 320px;
        }

        /* Mobile styles */
        @media (max-width: 768px) {
            #debug { display: none; }
            .controls .button-row button {
                padding: 14px 20px;
                font-size: 16px;
            }
        }

        #wordInput:focus {
            outline: none;
            border: 2px solid #9370db;
            background: #faf5ff;
        }

        .blurred-score {
            filter: blur(5px);
            user-select: none;
        }

        button[style*="background:#9370db"]:hover,
        button[style*="background: #9370db"]:hover,
        #compareRunsBtn:hover,
        #hideComparisonBtn:hover {
            background: #7d5bbe !important;
        }

        .clickable-plate:hover {
            color: #7d5bbe !important;
            cursor: pointer;
        }

        .plate-name-clickable:hover {
            color: #7d5bbe !important;
        }

        @keyframes pulseGlow {
            0%, 100% {
                box-shadow: 0 0 0 0 rgba(147, 112, 219, 0.4);
                transform: scale(1);
            }
            50% {
                box-shadow: 0 0 20px 5px rgba(147, 112, 219, 0.6);
                transform: scale(1.02);
            }
        }

        .pulse-button {
            animation: pulseGlow 2s ease-in-out infinite;
        }

        /* ===== LEADERBOARD TAB ===== */
        .lb-date-nav {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 12px;
            margin-bottom: 16px;
        }
        .lb-date-nav button {
            background: none;
            border: none;
            font-size: 1.3rem;
            color: #9370db;
            cursor: pointer;
            padding: 4px 8px;
            border-radius: 6px;
        }
        .lb-date-nav button:disabled {
            color: #d1d5db;
            cursor: default;
        }
        .lb-date-nav .lb-date-text {
            font-size: 1.05rem;
            font-weight: 600;
            color: #1f2937;
        }

        /* My Run card */
        .my-run-card {
            border: 2px solid #9370db;
            border-radius: 14px;
            padding: 14px 16px;
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            background: #faf5ff;
        }
        .my-run-card:hover { background: #f3e8ff; }
        .my-run-card .my-run-label {
            font-size: 0.85rem;
            color: #6b7280;
        }
        .my-run-card .my-run-time {
            font-size: 1.2rem;
            font-weight: 700;
            color: #1f2937;
        }
        .my-run-card .my-run-chevron {
            font-size: 1.2rem;
            color: #9ca3af;
        }

        /* Segmented control */
        .segmented-control {
            display: flex;
            background: #f3f4f6;
            border-radius: 10px;
            padding: 3px;
            margin-bottom: 12px;
        }
        .segmented-control button {
            flex: 1;
            padding: 8px 0;
            border: none;
            border-radius: 8px;
            background: transparent;
            font-weight: 500;
            font-size: 0.9rem;
            cursor: pointer;
            color: #6b7280;
            transition: all 0.2s;
        }
        .segmented-control button.active {
            background: #ffffff;
            color: #1f2937;
            font-weight: 600;
            box-shadow: 0 1px 3px rgba(0,0,0,0.1);
        }

        /* Leaderboard list rows */
        .lb-row {
            display: flex;
            align-items: center;
            padding: 12px 14px;
            border-bottom: 1px solid #f3f4f6;
            cursor: pointer;
            transition: background 0.15s;
            border-radius: 10px;
            margin-bottom: 2px;
        }
        .lb-row:hover { background: #f9fafb; }
        .lb-row.is-me { background: #faf5ff; }
        .lb-row.is-me:hover { background: #f3e8ff; }
        .lb-row .lb-rank {
            width: 36px;
            font-size: 1.1rem;
            font-weight: 700;
            flex-shrink: 0;
        }
        .lb-row .lb-name {
            flex: 1;
            font-weight: 500;
            font-size: 0.95rem;
            display: flex;
            align-items: center;
            gap: 6px;
            min-width: 0;
        }
        .lb-row .lb-name span {
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }
        .lb-badge {
            display: inline-block;
            padding: 1px 6px;
            border-radius: 6px;
            font-size: 0.7rem;
            font-weight: 600;
            flex-shrink: 0;
        }
        .lb-badge-you {
            background: #e9d5ff;
            color: #7c3aed;
        }
        .lb-badge-friend {
            background: #dcfce7;
            color: #16a34a;
        }
        .lb-streak {
            font-size: 0.8rem;
            color: #f59e0b;
            margin-left: 4px;
            flex-shrink: 0;
        }
        .lb-row .lb-time {
            font-weight: 600;
            font-size: 0.95rem;
            color: #1f2937;
            margin-right: 6px;
            flex-shrink: 0;
        }
        .lb-row .lb-chevron {
            color: #9ca3af;
            font-size: 1rem;
            flex-shrink: 0;
        }
        .lb-locked {
            font-size: 0.8rem;
            color: #9ca3af;
        }

        /* Compare runs */
        #compareRunsContainer {
            margin-top: 16px;
            text-align: center;
        }

        /* ===== PROFILE TAB ===== */
        .profile-card {
            text-align: center;
            padding: 40px 20px;
        }
        .profile-avatar {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            background: #9370db;
            color: #ffffff;
            font-size: 2rem;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
        }
        .profile-name {
            font-size: 1.3rem;
            font-weight: 700;
            color: #1f2937;
            margin-bottom: 4px;
        }
        .profile-email {
            font-size: 0.9rem;
            color: #6b7280;
            margin-bottom: 24px;
        }
        .profile-handle {
            font-size: 0.95rem;
            color: #9370db;
            margin-bottom: 20px;
        }
        .profile-signout-btn {
            padding: 10px 24px;
            background: #ef4444;
            color: #ffffff;
            border: none;
            border-radius: 10px;
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
        }
        .profile-signin-btn {
            padding: 14px 28px;
            background: #000000;
            color: #ffffff;
            border: none;
            border-radius: 12px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .profile-signin-btn:hover { opacity: 0.85; }

        /* Hidden date picker for leaderboard */
        #leaderboardDatePicker { display: none; }