:root {
            --bg-dark: #0f0f13;
            --bg-darker: #07070a;
            --bg-card: #1a1a24;
            --accent-blue: #4d8eff;
            --accent-purple: #8a63ff;
            --accent-cyan: #00e0ff;
            --text-primary: #f0f0f5;
            --text-secondary: #a0a0b0;
            --success: #2dd4a7;
            --warning: #ffb74d;
            --danger: #ff6b6b;
            --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
            --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.35);
            --border-radius: 12px;
            --glass-effect: rgba(30, 30, 45, 0.6);
        }

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

        body {
            font-family: 'Inter', sans-serif;
            background-color: var(--bg-dark);
            color: var(--text-primary);
            line-height: 1.6;
            min-height: 100vh;
            background-image: 
                radial-gradient(circle at 25% 25%, rgba(77, 142, 255, 0.15) 0%, transparent 50%),
                radial-gradient(circle at 75% 75%, rgba(138, 99, 255, 0.15) 0%, transparent 50%);
        }

        h1, h2, h3, h4, h5, h6 {
            font-family: 'Space Grotesk', sans-serif;
            font-weight: 600;
            margin-bottom: 1.25rem;
            letter-spacing: -0.5px;
        }

        h1 { 
            font-size: 2.75rem; 
            background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        h2 { 
            font-size: 2rem; 
            color: var(--text-primary);
            position: relative;
            display: inline-block;
        }

        h2:after {
            content: '';
            position: absolute;
            bottom: -8px;
            left: 0;
            width: 50px;
            height: 3px;
            background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
            border-radius: 3px;
        }

        h3 { font-size: 1.5rem; }

        p {
            color: var(--text-secondary);
            margin-bottom: 1.5rem;
            font-weight: 300;
            line-height: 1.7;
        }

        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 2rem;
        }

        header {
            background-color: var(--glass-effect);
            padding: 1.5rem 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            position: sticky;
            top: 0;
            z-index: 100;
        }

        .card {
            background: var(--glass-effect);
            border-radius: var(--border-radius);
            padding: 2rem;
            margin-bottom: 2.5rem;
            box-shadow: var(--shadow);
            transition: var(--transition);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid rgba(255, 255, 255, 0.05);
            position: relative;
            overflow: hidden;
        }

        .card:before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(77, 142, 255, 0.1) 0%, transparent 70%);
            opacity: 0;
            transition: var(--transition);
        }

        .card:hover:before {
            opacity: 1;
        }

        .card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(255, 255, 255, 0.1);
        }

        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 2rem;
            margin: 2.5rem 0;
        }

        #greeting {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--text-primary);
            background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            animation: fadeIn 0.8s ease, float 6s ease-in-out infinite;
            position: relative;
        }

        button, input[type="submit"], input[type="button"] {
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
            color: white;
            border: none;
            padding: 0.85rem 1.75rem;
            border-radius: 8px;
            cursor: pointer;
            font-family: 'Inter', sans-serif;
            font-weight: 500;
            transition: var(--transition);
            margin: 0.25rem;
            box-shadow: 0 4px 15px rgba(77, 142, 255, 0.3);
            position: relative;
            overflow: hidden;
        }

        button:after, input[type="submit"]:after, input[type="button"]:after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(135deg, rgba(255, 255, 255, 0.2), transparent);
            transform: translateX(-100%);
            transition: transform 0.4s ease;
        }

        button:hover:after, input[type="submit"]:hover:after, input[type="button"]:hover:after {
            transform: translateX(0);
        }

        button:hover, input[type="submit"]:hover, input[type="button"]:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 25px rgba(77, 142, 255, 0.4);
        }

        button:active, input[type="submit"]:active, input[type="button"]:active {
            transform: translateY(1px);
        }

        #logoutBtn {
            background: var(--danger);
            box-shadow: 0 4px 15px rgba(255, 107, 107, 0.3);
        }

        #logoutBtn:hover {
            box-shadow: 0 8px 25px rgba(255, 107, 107, 0.4);
        }

        #startBtn { 
            background: var(--success);
            box-shadow: 0 4px 15px rgba(45, 212, 167, 0.3);
        }
        #pauseBtn { 
            background: var(--warning);
            box-shadow: 0 4px 15px rgba(255, 183, 77, 0.3);
        }
        #stopBtn { 
            background: var(--danger);
            box-shadow: 0 4px 15px rgba(255, 107, 107, 0.3);
        }
        #resetBtn { 
            background: var(--bg-card);
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
        }

        input[type="text"],
        input[type="number"],
        input[type="time"],
        input[type="password"],
        input[type="email"],
        textarea,
        input,
        select {
            width: 100%;
            padding: 0.85rem 1.25rem;
            margin-bottom: 1.5rem;
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 8px;
            background: rgba(10, 10, 15, 0.5);
            color: var(--text-primary);
            font-family: 'Inter', sans-serif;
            font-size: 1rem;
            transition: var(--transition);
        }

        input:focus, textarea:focus {
            outline: none;
            border-color: var(--accent-blue);
            box-shadow: 0 0 0 3px rgba(77, 142, 255, 0.2);
            background: rgba(10, 10, 15, 0.7);
        }

        #time {
            font-size: 3.5rem;
            text-align: center;
            margin: 1.5rem 0;
            font-family: 'Space Grotesk', sans-serif;
            color: var(--accent-cyan);
            background: rgba(0, 224, 255, 0.05);
            padding: 1.5rem;
            border-radius: var(--border-radius);
            letter-spacing: 2px;
            text-shadow: 0 0 10px rgba(0, 224, 255, 0.3);
            border: 1px solid rgba(0, 224, 255, 0.1);
        }

        .button-group {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 0.75rem;
            margin-top: 1.5rem;
        }

        #goalProgressContainer {
            position: relative;
            width: 220px;
            height: 220px;
            margin: 0 auto 2rem;
            background: var(--glass-effect);
            border-radius: 50%;
            padding: 15px;
            box-shadow: var(--shadow);
            border: 1px solid rgba(255, 255, 255, 0.05);
        }

        #goalProgressLabel {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--text-primary);
            font-family: 'Space Grotesk', sans-serif;
        }

        .chart-container {
            background: var(--glass-effect);
            border-radius: var(--border-radius);
            padding: 1.5rem;
            margin: 1.5rem 0;
            box-shadow: var(--shadow);
            border: 1px solid rgba(255, 255, 255, 0.05);
        }

        .history, .sessHistory {
            background: var(--glass-effect);
            padding: 2rem;
            border-radius: var(--border-radius);
            margin-bottom: 2.5rem;
            box-shadow: var(--shadow);
            border: 1px solid rgba(255, 255, 255, 0.05);
        }

        .history dt, .sessHistory dt {
            font-weight: 600;
            color: var(--accent-blue);
            margin-top: 1.5rem;
            font-size: 1.1rem;
            display: flex;
            align-items: center;
        }

        .history dt:before, .sessHistory dt:before {
            content: '→';
            color: var(--accent-purple);
            margin-right: 0.75rem;
            font-weight: bold;
        }

        .history dd, .sessHistory dd {
            margin-left: 2rem;
            margin-bottom: 1.5rem;
            color: var(--text-secondary);
            padding-left: 1.5rem;
            border-left: 2px solid var(--accent-purple);
            font-weight: 300;
        }

        .plan-day {
            margin-bottom: 2rem;
            background: var(--glass-effect);
            padding: 1.5rem;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            border: 1px solid rgba(255, 255, 255, 0.05);
            transition: var(--transition);
        }

        .plan-day:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
        }

        .plan-day h3 {
            font-size: 1.3rem;
            color: var(--accent-blue);
            margin-bottom: 1rem;
            padding-bottom: 0.75rem;
            border-bottom: 1px solid rgba(138, 99, 255, 0.3);
            display: flex;
            align-items: center;
        }

        .plan-day h3:before {
            content: '📅';
            margin-right: 0.75rem;
            font-size: 1.1rem;
        }

        .plan-day ul {
            list-style: none;
            padding-left: 0;
        }

        .plan-day li.task {
            background: rgba(10, 10, 15, 0.5);
            padding: 1.25rem;
            margin-bottom: 0.75rem;
            border-radius: 8px;
            color: var(--text-primary);
            transition: var(--transition);
            border-left: 4px solid var(--accent-blue);
            display: flex;
            flex-direction: column;
        }

        .plan-day li.task:hover {
            background: rgba(77, 142, 255, 0.1);
            transform: translateX(5px);
            border-left-color: var(--accent-purple);
        }

        .plan-day li.task strong {
            display: block;
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: var(--text-primary);
            font-size: 1.05rem;
        }

        .plan-day li.task em {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-bottom: 0.5rem;
        }

        .plan-day li.task .duration {
            background-color: var(--success);
            border-radius: 20px;
            color: white;
            padding: 0.3rem 0.8rem;
            font-size: 0.8rem;
            display: inline-block;
            margin-top: 0.3rem;
            align-self: flex-start;
            font-style: normal;
            font-weight: 500;
        }
        .logo-container {
            text-align: center;
        }

        .logo {
            height: 2rem; 
            width: auto;
            transition: var(--transition);
        }

        .logo:hover {
            transform: translateY(-3px);
        }

        .chart-container {
          position: relative;
          height: 600px;
          width: 100%;
          max-width: 700px;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(-15px); }
            to { opacity: 1; transform: translateY(0); }
        }

        @keyframes float {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-5px); }
        }

        @keyframes pulse {
            0%, 100% { transform: scale(1); }
            50% { transform: scale(1.03); }
        }

        .fade-in {
            animation: fadeIn 0.6s ease forwards;
        }

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

        .section-description {
            color: var(--text-secondary);
            margin-bottom: 2rem;
            font-weight: 300;
            border-left: 3px solid var(--accent-purple);
            padding-left: 1.25rem;
            font-size: 1.05rem;
        }

        #loading {
            display: none;
            text-align: center;
            padding: 1.5rem;
            color: var(--accent-cyan);
            font-weight: 500;
            font-size: 1.1rem;
        }

        #searchForm {
            display: flex;
            gap: 0.75rem;
            margin-bottom: 2.5rem;
        }

        #searchPlan {
            flex-grow: 1;
            background: rgba(10, 10, 15, 0.7);
        }

        #weeklyStudyChart {
          width: 100%;
          height: 300px !important;  
          max-width: 600px !important; 
          overflow: hidden;
        }

        .fab {
            display: none;
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
            color: white;
            font-size: 1.5rem;
            border: none;
            box-shadow: 0 6px 20px rgba(77, 142, 255, 0.4);
            z-index: 90;
            justify-content: center;
            align-items: center;
            cursor: pointer;
            transition: var(--transition);
        }

        .fab:hover {
            transform: translateY(-5px) scale(1.1);
            box-shadow: 0 10px 30px rgba(77, 142, 255, 0.5);
        }

        .heatmap-day {
          width: 1rem;
          height: 1rem;
          border-radius: 3px;
          transition: background-color 0.3s;
          margin-top: 0.4rem;
        }


        @media (max-width: 768px) {
            .container {
                padding: 1.5rem;
            }

            header {
                flex-direction: column;
                text-align: center;
                padding: 1.5rem;
            }

            #greeting {
                margin-bottom: 1rem;
            }

            .card-grid {
                grid-template-columns: 1fr;
            }

            #time {
                font-size: 2.5rem;
            }

            .button-group {
                flex-direction: column;
            }

            button, input[type="submit"], input[type="button"] {
                width: 100%;
            }

            .fab {
                display: flex;
            }
        }

        ::-webkit-scrollbar {
            width: 8px;
            height: 8px;
        }

        ::-webkit-scrollbar-track {
            background: var(--bg-darker);
        }

        ::-webkit-scrollbar-thumb {
            background: linear-gradient(var(--accent-blue), var(--accent-purple));
            border-radius: 10px;
        }

        ::-webkit-scrollbar-thumb:hover {
            background: var(--accent-purple);
        }

        [data-tooltip] {
            position: relative;
        }

        [data-tooltip]:hover:after {
            content: attr(data-tooltip);
            position: absolute;
            bottom: 100%;
            left: 50%;
            transform: translateX(-50%);
            background: var(--bg-card);
            color: var(--text-primary);
            padding: 0.5rem 1rem;
            border-radius: 6px;
            font-size: 0.85rem;
            white-space: nowrap;
            box-shadow: var(--shadow);
            z-index: 10;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        input, input * {
          pointer-events: auto !important;
          position:relative;
          z-index: 1000;
          opacity: 1 !important;
          visibility: visible !important;
        }
        #xp{
            background: linear-gradient(135deg, var(--warning), var(--accent-purple));
            color: white;
            border: none;
            padding: 1.75rem;
            border-radius: 8px;
            cursor: pointer;
            font-family: "Michroma", sans-serif;
            font-weight: 500;
            font-size: 1.8rem;
            transition: var(--transition);
            margin: 0.25rem;
            margin-bottom: 2rem;
            box-shadow: 0 4px 15px rgba(77, 142, 255, 0.3);
            position: relative;
            overflow: hidden;
            width: fit-content;
        }
        .xpImg{
            height:2.3rem;
            width: 2.3rem
        }
        #streak{
            background: linear-gradient(135deg, var(--warning), var(--accent-purple));
            color: white;
            border: none;
            padding: 1.75rem;
            border-radius: 8px;
            cursor: pointer;
            font-family: "Michroma", sans-serif;
            font-weight: 500;
            font-size: 1.8rem;
            transition: var(--transition);
            margin: 0.25rem;
            margin-bottom: 2rem;
            box-shadow: 0 4px 15px rgba(77, 142, 255, 0.3);
            position: relative;
            overflow: hidden;
            width: fit-content;
        }
        .streakImg{
            height:2.3rem;
            width: 2.3rem
        }
        #streakWarning{
            background-color: var(--warning);
            color:var(--danger);
        }

        .pomodoro-settings {
          display: flex;
          gap: 0.5rem;
          flex-wrap: wrap;
          margin-bottom: 1rem;
        }
        
        #timePomodoro {
          font-size: 2rem;
          text-align: center;
          margin: 1rem 0;
          font-weight: bold;
        }