:root {
            --bg-color: #f4f7fa;
            --container-bg: #ffffff;
            --text-color: #333333;
            --pomodoro-color: #ff6b6b;
            --pomodoro-hover: #ff4757;
            --pomodoro-active: #e84118;
            --short-break-color: #48dbfb;
            --short-break-hover: #0fbcf9;
            --short-break-active: #00a8ff;
            --long-break-color: #1dd1a1;
            --long-break-hover: #10ac84;
            --long-break-active: #01a3a4;
            --secondary-color: #576574;
            --button-bg: #e0e5ec;
            --button-text: #576574;
            --shadow-light: #ffffff;
            --shadow-dark: #a3b1c6;
            --input-bg: #f0f3f6;
            --border-color: #d1d9e6;
            --completed-color: #a4b0be;
            --theme-icon: '🌓';
            --settings-icon: '⚙️';
            --audio-icon: '🔊';
            --button-bg-hover: #c8d0e0;
            --panel-shadow: rgba(0, 0, 0, 0.1);
        }

        body.dark-mode {
            --bg-color: #1e272e;
            --container-bg: #2d3b48;
            --text-color: #f5f6fa;
            --pomodoro-color: #ff7f50;
            --pomodoro-hover: #ff6348;
            --pomodoro-active: #d35400;
            --short-break-color: #0abde3;
            --short-break-hover: #09aee0;
            --short-break-active: #089ac9;
            --long-break-color: #10ac84;
            --long-break-hover: #0e9975;
            --long-break-active: #0c8265;
            --secondary-color: #dcdde1;
            --button-bg: #485460;
            --button-text: #f5f6fa;
            --shadow-light: #3c4a58;
            --shadow-dark: #12181c;
            --input-bg: #3a4753;
            --border-color: #4a5867;
            --completed-color: #718093;
            --theme-icon: '🌙';
            --button-bg-hover: #5a6876;
            --panel-shadow: rgba(0, 0, 0, 0.3);
        }

        * {
            box-sizing: border-box;
        }

        body {
            font-family: 'Poppins', sans-serif;
            background-color: var(--bg-color);
            color: var(--text-color);
            margin: 0;
            transition: background-color 0.4s, color 0.4s;
            overflow-x: hidden;
            display: flex;
            flex-direction: column;
            align-items: center;
            min-height: 100vh;
        }

        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            height: 100vh;
            width: 100vw;
            z-index: -1;
            background: var(--bg-color);
            background-image: linear-gradient(135deg, var(--pomodoro-color) 0%, var(--secondary-color) 100%);
            background-size: 400% 400%;
            animation: gradientAnimation 15s ease infinite;
            opacity: 0.15;
        }

        @keyframes gradientAnimation {
            0% {
                background-position: 0% 50%;
            }

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

            100% {
                background-position: 0% 50%;
            }
        }

        .site-header {
            width: 100%;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1rem 2rem;
            background-color: var(--container-bg);
            box-shadow: 0 2px 20px var(--panel-shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
            transition: background-color 0.4s, box-shadow 0.4s;
        }

        .header-left .site-title {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--text-color);
            margin: 0;
        }

        .header-right {
            display: flex;
            gap: 1rem;
            align-items: center;
        }

        .header-right .btn {
            padding: 0.6rem 1.2rem;
            border: none;
            border-radius: 10px;
            background-color: var(--button-bg);
            color: var(--button-text);
            font-size: 1rem;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 4px 4px 8px var(--shadow-dark), -4px -4px 8px var(--shadow-light);
            text-decoration: none;
        }

        .header-right .btn:hover {
            background-color: var(--button-bg-hover);
            transform: translateY(-2px);
        }

        .header-right .btn:active {
            transform: translateY(1px);
        }

        #countdown-link {
            background-color: var(--pomodoro-color);
            color: white;
        }

        #countdown-link:hover {
            background-color: var(--pomodoro-hover);
        }

        
        .floating-controls {
            position: fixed;
            right: 20px;
            top: 50%;
            transform: translateY(-50%);
            display: flex;
            flex-direction: column;
            gap: 15px;
            z-index: 100;
        }

        .floating-controls button {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            border: none;
            background-color: var(--container-bg);
            color: var(--text-color);
            font-size: 1.3rem;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 15px var(--panel-shadow);
            transition: all 0.3s ease;
        }

        .floating-controls button:hover {
            transform: scale(1.1) rotate(15deg);
            background-color: var(--button-bg);
        }

        .floating-controls button:active {
            transform: scale(0.95) rotate(5deg);
        }

        #theme-toggle::before {
            content: var(--theme-icon);
        }

        #settings-btn::before {
            content: var(--settings-icon);
        }

        #audio-btn::before {
            content: var(--audio-icon);
        }

        #animation-btn::before {
            content: '❄️';
        }

        
        #settings-panel {
            position: fixed;
            top: 50%;
            right: 80px;
            transform: translateY(-50%);
            background-color: var(--container-bg);
            border: 1px solid var(--border-color);
            border-radius: 15px;
            padding: 20px;
            box-shadow: 0 10px 30px var(--panel-shadow);
            z-index: 10;
            display: grid;
            gap: 15px;
            grid-template-columns: 1fr 1fr;
            align-items: center;
            opacity: 0;
            transform: translateY(-50%) translateX(20px);
            pointer-events: none;
            transition: opacity 0.3s ease, transform 0.3s ease;
        }

        #settings-panel.visible {
            opacity: 1;
            transform: translateY(-50%) translateX(0);
            pointer-events: auto;
        }

        #settings-panel label {
            text-align: left;
            font-weight: 500;
        }

        #settings-panel input {
            width: 80px;
            padding: 5px;
            border-radius: 5px;
            border: 1px solid var(--border-color);
            background-color: var(--input-bg);
            color: var(--text-color);
            font-size: 1rem;
        }

        #settings-panel button {
            grid-column: 1 / -1;
            padding: 10px;
            background-color: var(--pomodoro-color);
            color: white;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            transition: background-color 0.2s, transform 0.2s;
        }

        #settings-panel button:active {
            background-color: var(--pomodoro-active);
            transform: translateY(2px);
        }

        
        #audio-panel {
            position: fixed;
            top: 50%;
            right: 80px;
            transform: translateY(-50%);
            background-color: var(--container-bg);
            border: 1px solid var(--border-color);
            border-radius: 15px;
            padding: 20px;
            box-shadow: 0 10px 30px var(--panel-shadow);
            z-index: 10;
            display: flex;
            flex-direction: column;
            gap: 15px;
            width: 280px;
            opacity: 0;
            transform: translateY(-50%) translateX(20px);
            pointer-events: none;
            transition: opacity 0.3s ease, transform 0.3s ease;
        }

        #audio-panel.visible {
            opacity: 1;
            transform: translateY(-50%) translateX(0);
            pointer-events: auto;
        }

        
        #animation-panel {
            position: fixed;
            top: 50%;
            right: 80px;
            transform: translateY(-50%);
            background-color: var(--container-bg);
            border: 1px solid var(--border-color);
            border-radius: 15px;
            padding: 20px;
            box-shadow: 0 10px 30px var(--panel-shadow);
            z-index: 10;
            display: flex;
            flex-direction: column;
            gap: 15px;
            width: 280px;
            opacity: 0;
            transform: translateY(-50%) translateX(20px);
            pointer-events: none;
            transition: opacity 0.3s ease, transform 0.3s ease;
        }

        #animation-panel.visible {
            opacity: 1;
            transform: translateY(-50%) translateX(0);
            pointer-events: auto;
        }

        .audio-control-group,
        .animation-control-group {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .audio-control-group label,
        .animation-control-group label {
            font-weight: 500;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .toggle-switch {
            position: relative;
            display: inline-block;
            width: 50px;
            height: 24px;
        }

        .toggle-switch input {
            opacity: 0;
            width: 0;
            height: 0;
        }

        .toggle-slider {
            position: absolute;
            cursor: pointer;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-color: var(--button-bg);
            transition: .4s;
            border-radius: 24px;
        }

        .toggle-slider:before {
            position: absolute;
            content: "";
            height: 16px;
            width: 16px;
            left: 4px;
            bottom: 4px;
            background-color: white;
            transition: .4s;
            border-radius: 50%;
        }

        input:checked+.toggle-slider {
            background-color: var(--pomodoro-color);
        }

        input:checked+.toggle-slider:before {
            transform: translateX(26px);
        }

        .volume-control,
        .animation-intensity-control {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .volume-slider,
        .intensity-slider {
            flex: 1;
            -webkit-appearance: none;
            appearance: none;
            height: 6px;
            border-radius: 3px;
            background: var(--button-bg);
            outline: none;
        }

        .volume-slider::-webkit-slider-thumb,
        .intensity-slider::-webkit-slider-thumb {
            -webkit-appearance: none;
            appearance: none;
            width: 18px;
            height: 18px;
            border-radius: 50%;
            background: var(--pomodoro-color);
            cursor: pointer;
        }

        .volume-slider::-moz-range-thumb,
        .intensity-slider::-moz-range-thumb {
            width: 18px;
            height: 18px;
            border-radius: 50%;
            background: var(--pomodoro-color);
            cursor: pointer;
            border: none;
        }

        .duration-control {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .duration-slider {
            flex: 1;
            -webkit-appearance: none;
            appearance: none;
            height: 6px;
            border-radius: 3px;
            background: var(--button-bg);
            outline: none;
        }

        .duration-slider::-webkit-slider-thumb {
            -webkit-appearance: none;
            appearance: none;
            width: 18px;
            height: 18px;
            border-radius: 50%;
            background: var(--pomodoro-color);
            cursor: pointer;
        }

        .duration-slider::-moz-range-thumb {
            width: 18px;
            height: 18px;
            border-radius: 50%;
            background: var(--pomodoro-color);
            cursor: pointer;
            border: none;
        }

        .audio-test-btn,
        .animation-preview-btn {
            padding: 8px 15px;
            background-color: var(--pomodoro-color);
            color: white;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            font-weight: 500;
            transition: background-color 0.2s, transform 0.2s;
        }

        .audio-test-btn:active,
        .animation-preview-btn:active {
            background-color: var(--pomodoro-active);
            transform: translateY(2px);
        }

        .animation-type-selector {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .animation-option {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 8px;
            border-radius: 8px;
            cursor: pointer;
            transition: background-color 0.2s;
        }

        .animation-option:hover {
            background-color: var(--button-bg);
        }

        .animation-option input {
            margin: 0;
        }

        main {
            flex: 1 0 auto;
            width: 100%;
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 20px 0;
            margin-top: 0;
        }

        .container {
            width: 100%;
            max-width: 940px;
            background-color: var(--container-bg);
            border-radius: 15px;
            padding: 40px;
            box-shadow: 10px 10px 20px var(--shadow-dark), -10px -10px 20px var(--shadow-light);
            text-align: center;
            transition: background-color 0.4s, box-shadow 0.4s;
            margin: 0 20px;
            position: relative;
            overflow: hidden;
        }

        .container>* {
            position: relative;
            z-index: 1;
        }

        h1 {
            font-size: 2.5rem;
            margin: 0;
        }

        #current-task-display {
            margin-bottom: 20px;
            min-height: 24px;
            font-size: 1.2rem;
            font-weight: 500;
            color: var(--secondary-color);
        }

        .tabs {
            display: flex;
            justify-content: center;
            gap: 15px;
            margin-bottom: 20px;
        }

        .tabs button {
            padding: 10px 25px;
            border: none;
            border-radius: 10px;
            background-color: var(--button-bg);
            color: var(--button-text);
            font-size: 1rem;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .tabs button.active {
            color: white;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
        }

        #pomodoro-btn.active {
            background-color: var(--pomodoro-color);
        }

        #short-break-btn.active {
            background-color: var(--short-break-color);
        }

        #long-break-btn.active {
            background-color: var(--long-break-color);
        }

        .tabs button:active {
            transform: scale(0.95);
        }

        .timer-display {
            font-size: 8rem;
            font-weight: 700;
            margin-bottom: 20px;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .digits {
            display: flex;
        }

        .digits span {
            display: inline-block;
            width: 1ch;
            text-align: center;
        }

        .colon {
            margin: 0 0.15em;
            transform: translateY(-0.05em);
        }

        .controls button {
            padding: 15px 40px;
            font-size: 1.2rem;
            font-weight: 600;
            border: none;
            border-radius: 12px;
            cursor: pointer;
            margin: 0 10px;
            transition: all 0.3s ease;
        }

        #start-pause-btn {
            color: white;
        }

        #reset-btn {
            background-color: var(--button-bg);
            color: var(--button-text);
        }

        #reset-btn:hover {
            background-color: var(--button-bg-hover);
        }

        #reset-btn:active {
            transform: translateY(1px);
            filter: brightness(0.95);
        }

        .divider {
            height: 2px;
            background-color: var(--border-color);
            margin: 40px auto;
            width: 80%;
            border-radius: 1px;
        }

        .task-list-container {
            padding-top: 20px;
        }

        .task-list-container h2 {
            margin-bottom: 20px;
        }

        .add-task-form {
            display: flex;
            gap: 10px;
            margin-bottom: 20px;
        }

        #new-task-input {
            flex-grow: 1;
            padding: 12px 20px;
            border: 2px solid var(--border-color);
            background-color: var(--input-bg);
            color: var(--text-color);
            border-radius: 10px;
            font-size: 1rem;
        }

        #add-task-btn {
            padding: 12px 20px;
            background-color: var(--pomodoro-color);
            color: white;
            border: none;
            border-radius: 10px;
            font-weight: 500;
            cursor: pointer;
            transition: background-color 0.2s, transform 0.2s;
        }

        #add-task-btn:active {
            background-color: var(--pomodoro-active);
            transform: translateY(2px);
        }

        #task-list {
            list-style: none;
            padding: 0;
            margin: 0;
            text-align: left;
        }

        #task-list li {
            display: flex;
            align-items: center;
            gap: 15px;
            background-color: var(--input-bg);
            padding: 15px;
            border-radius: 10px;
            margin-bottom: 10px;
            cursor: pointer;
            border: 2px solid transparent;
            transition: all 0.3s ease;
        }

        #task-list li:hover {
            background-color: var(--button-bg);
        }

        #task-list li.active-task {
            border-color: var(--pomodoro-color);
            box-shadow: 0 0 10px var(--pomodoro-color);
        }

        #task-list .task-text {
            flex-grow: 1;
        }

        #task-list li.completed .task-text {
            text-decoration: line-through;
            color: var(--completed-color);
        }

        .task-checkbox {
            -webkit-appearance: none;
            appearance: none;
            background-color: transparent;
            margin: 0;
            font: inherit;
            color: var(--secondary-color);
            width: 1.5em;
            height: 1.5em;
            border: 0.15em solid var(--secondary-color);
            border-radius: 0.3em;
            transform: translateY(-0.075em);
            display: grid;
            place-content: center;
            cursor: pointer;
        }

        .task-checkbox::before {
            content: "";
            width: 0.8em;
            height: 0.8em;
            transform: scale(0);
            transition: 120ms transform ease-in-out;
            box-shadow: inset 1em 1em var(--pomodoro-color);
            transform-origin: bottom left;
            clip-path: polygon(14% 44%, 0 65%, 50% 100%, 100% 16%, 80% 0%, 43% 62%);
        }

        .task-checkbox:checked::before {
            transform: scale(1);
        }

        #task-list .remove-task-btn {
            background: none;
            border: none;
            color: var(--secondary-color);
            font-size: 1.5rem;
            font-weight: bold;
            cursor: pointer;
            padding: 0 5px;
            line-height: 1;
            border-radius: 5px;
            transition: background-color 0.2s, color 0.2s;
        }

        #task-list .remove-task-btn:hover {
            color: white;
            background-color: var(--pomodoro-color);
        }

        
        #animation-container {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            z-index: -1;
            pointer-events: none;
            overflow: hidden;
        }

        .falling-item {
            position: absolute;
            top: -10%;
            user-select: none;
            animation-iteration-count: infinite;
            animation-timing-function: linear;
            pointer-events: none;
        }

        
        .flower {
            animation-name: fall-flower;
            font-size: 20px;
            opacity: 0.8;
        }

        @keyframes fall-flower {
            0% {
                transform: translateY(0) translateX(0) rotate(0deg);
                opacity: 0.8;
            }

            100% {
                transform: translateY(110vh) translateX(20px) rotate(360deg);
                opacity: 0;
            }
        }

        
        .snowflake {
            animation-name: fall-snow;
            color: white;
            opacity: 0.8;
            font-size: 18px;
        }

        @keyframes fall-snow {
            0% {
                transform: translateY(0) translateX(0) rotate(0deg);
                opacity: 0.8;
            }

            100% {
                transform: translateY(110vh) translateX(10px) rotate(360deg);
                opacity: 0;
            }
        }

        
        .leaf {
            animation-name: fall-leaf;
            font-size: 22px;
            opacity: 0.7;
        }

        @keyframes fall-leaf {
            0% {
                transform: translateY(0) translateX(0) rotateZ(0deg);
                opacity: 0.7;
            }

            100% {
                transform: translateY(110vh) translateX(-15px) rotateZ(-180deg);
                opacity: 0;
            }
        }

        #pomodoro-info {
            width: 100%;
            max-width: 940px;
            margin: 40px 20px 0 20px;
            padding: 0 15px;
            background-color: transparent;
            color: var(--text-color);
            text-align: left;
            line-height: 1.6;
        }

        #pomodoro-info h2,
        #pomodoro-info h3 {
            color: var(--text-color);
        }

        #pomodoro-info ul {
            padding-left: 30px;
        }

        .related-pages {
            margin: 30px 15px 15px 15px;
            text-align: center;
        }

        .related-pages .section-title {
            font-size: 1.4rem;
            font-weight: 600;
            color: var(--text-color);
            margin-bottom: 15px;
        }

        .related-links {
            list-style: none;
            padding: 0;
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 10px;
        }

        .related-links li a {
            text-decoration: none;
            background-color: var(--button-bg);
            color: var(--button-text);
            padding: 8px 15px;
            border-radius: 8px;
            font-weight: 500;
            transition: background-color 0.3s, transform 0.2s;
        }

        .related-links li a:hover {
            background-color: var(--pomodoro-color);
            color: #fff;
            transform: translateY(-2px);
        }

        .footer-links {
            text-align: center;
            margin: 20px 0;
        }

        .footer-links ul {
            list-style: none;
            padding: 0;
            display: flex;
            justify-content: center;
            gap: 20px;
        }

        .footer-links ul li a {
            text-decoration: none;
            color: var(--secondary-color);
            font-weight: 500;
            transition: color 0.3s;
        }

        .footer-links ul li a:hover {
            color: var(--pomodoro-color);
        }

        footer {
            width: 100%;
            max-width: 940px;
            margin: 40px 20px 20px 20px;
            padding: 20px;
            text-align: center;
            font-size: 0.9rem;
            font-weight: 300;
            color: var(--secondary-color);
            border-top: 1px solid var(--border-color);
        }

        footer a {
            color: var(--secondary-color);
            text-decoration: none;
            font-weight: 400;
            border-bottom: 1px solid transparent;
            transition: color 0.3s, border-color 0.3s;
        }

        footer a:hover {
            color: var(--pomodoro-color);
            border-bottom-color: var(--pomodoro-color);
        }

        
        @media (max-width: 768px) {
            .site-header {
                padding: 1rem;
            }

            .header-left .site-title {
                font-size: 1.3rem;
            }

            .header-right {
                gap: 0.5rem;
            }

            .header-right .btn {
                padding: 0.5rem 1rem;
                font-size: 0.9rem;
            }

            .floating-controls {
                right: 10px;
            }

            .floating-controls button {
                width: 45px;
                height: 45px;
                font-size: 1.1rem;
            }

            #settings-panel,
            #audio-panel,
            #animation-panel {
                right: 60px;
                width: 250px;
            }

            #settings-panel {
                grid-template-columns: 1fr;
                gap: 12px;
                padding: 15px;
            }

            #settings-panel label {
                text-align: left;
                font-size: 0.9rem;
            }

            #settings-panel input {
                width: 100%;
                padding: 10px;
            }

            #settings-panel button {
                padding: 12px;
                margin-top: 5px;
            }

            .container {
                padding: 20px;
                margin: 0 10px;
            }

            h1 {
                font-size: 2rem;
            }

            .timer-display {
                font-size: 7rem;
                
            }

            .tabs button {
                padding: 10px 15px;
                font-size: 0.9rem;
            }

            .controls button {
                padding: 12px 30px;
                font-size: 1rem;
            }

            .add-task-form {
                flex-direction: column;
            }

            #pomodoro-info {
                margin: 30px 10px 0 10px;
            }

            footer {
                margin: 30px 10px 10px 10px;
            }

            
            #settings-panel,
            #audio-panel,
            #animation-panel {
                top: 50%;
                left: 50%;
                right: auto;
                transform: translate(-50%, -50%) translateY(20px);
            }

            #settings-panel.visible,
            #audio-panel.visible,
            #animation-panel.visible {
                transform: translate(-50%, -50%) translateY(0);
            }
        }

        @media (max-width: 480px) {
            .site-header {
                padding: 0.8rem 1rem;
            }

            .header-left .site-title {
                font-size: 1.2rem;
            }

            .header-right {
                gap: 0.4rem;
            }

            .header-right .btn {
                padding: 0.4rem 0.8rem;
                font-size: 0.8rem;
            }

            .floating-controls {
                right: 5px;
            }

            .floating-controls button {
                width: 40px;
                height: 40px;
                font-size: 1rem;
            }

            #settings-panel,
            #audio-panel,
            #animation-panel {
                right: 50px;
                width: 220px;
                padding: 12px;
            }

            .container {
                padding: 15px;
            }

            h1 {
                font-size: 1.8rem;
            }

            .timer-display {
                font-size: 4rem;
            }

            .tabs button {
                padding: 8px 12px;
                font-size: 0.8rem;
            }

            .controls button {
                padding: 10px 25px;
                font-size: 0.9rem;
            }
        }