* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* CSS Variables for Theme Support */
:root {
    --bg-gradient-1: #1f1c2c;
    --bg-gradient-2: #928dab;
    --container-bg: #2b2e4a;
    --text-color: #ffffff;
    --accent-color: #fddb3a;
    --accent-hover: #ffc107;
    --card-bg: #e94f37;
    --card-hover: #d2270d;
    --shadow-color: rgba(0, 0, 0, 0.5);
    --border-color: #3a3a52;
    --input-bg: #ffffff;
    --input-text: #1f1c2c;
    --loader-border: #f3f3f3;
    --loader-top: #fddb3a;
    --circle-bg: #3a3a52;
    --progress-easy: #00c9a7;
    --progress-medium: #fdcb6e;
    --progress-hard: #e17055;
    --error-color: #ff6b6b;
}

[data-theme="light"] {
    --bg-gradient-1: #f5f7fa;
    --bg-gradient-2: #c3cfe2;
    --container-bg: #ffffff;
    --text-color: #1f1c2c;
    --accent-color: #6c5ce7;
    --accent-hover: #5a4bd1;
    --card-bg: #6c5ce7;
    --card-hover: #5a4bd1;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --border-color: #e0e0e0;
    --input-bg: #f5f5f5;
    --input-text: #050505;
    --loader-border: #e0e0e0;
    --loader-top: #6c5ce7;
    --circle-bg: #e8e8e8;
    --progress-easy: #00b894;
    --progress-medium: #fdcb6e;
    --progress-hard: #e17055;
    --error-color: #d63031;
}

body {
    background: linear-gradient(135deg, var(--bg-gradient-1), var(--bg-gradient-2));
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    transition: background 0.3s ease;
}

.container {
    background-color: var(--container-bg);
    padding: 30px;
    border-radius: 12px;
    width: 90%;
    max-width: 700px;
    box-shadow: 0 20px 60px var(--shadow-color);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    position: relative;
    transition: background 0.3s ease, box-shadow 0.3s ease;
}

/* Theme Toggle Button */
.theme-toggle {
    position: absolute;
    top: 15px;
    right: 15px;
    background: var(--accent-color);
    border: none;
    color: var(--text-color);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

.theme-toggle:hover {
    transform: rotate(30deg) scale(1.1);
    background: var(--accent-hover);
}

h1 {
    font-size: 2.2rem;
    text-align: center;
    color: var(--accent-color);
    transition: color 0.3s ease;
}

.user-container {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.user-input-container {
    display: flex;
    justify-content: space-between;
}

#user-input {
    width: 75%;
    padding: 10px;
    border-radius: 6px;
    border: 2px solid var(--border-color);
    outline: none;
    font-size: 1rem;
    background: var(--input-bg);
    color: var(--input-text);
    transition: border-color 0.3s ease, background 0.3s ease;
}

#user-input:focus {
    border-color: var(--accent-color);
}

#search-button {
    background-color: rgb(233, 121, 121);
    color: var(--input-text);
    border: none;
    padding: 10px 16px;
    font-weight: bold;
    font-size: 1rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
}

#search-button:hover:not(:disabled) {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(253, 219, 58, 0.3);
}

#search-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.stats-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-top: 20px;
}

.Progress {
    display: flex;
    justify-content: space-evenly;
    flex-wrap: wrap;
    gap: 15px;
}

.progress-item {
    text-align: center;
}

.circle {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    border: 4px solid var(--progress-easy);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    font-weight: bold;
    color: var(--text-color);
    background: conic-gradient(var(--progress-easy) var(--progress-degree, 0%), var(--circle-bg) 0%);
    flex-direction: column;
    transition: all 0.3s ease;
}

.circle span {
    position: relative;
    z-index: 2;
}

.circle:hover {
    color: var(--accent-color);
    transform: scale(1.05);
    cursor: pointer;
    box-shadow: 0 0 30px rgba(253, 219, 58, 0.2);
}

.easy-progress {
    --progress-color: var(--progress-easy);
}

.medium-progress {
    --progress-color: var(--progress-medium);
    border-color: var(--progress-medium);
}

.hard-progress {
    --progress-color: var(--progress-hard);
    border-color: var(--progress-hard);
}

.stats-cards {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: space-evenly;
}

.card {
    background-color: var(--card-bg);
    color: #ffffff;
    padding: 15px;
    border-radius: 10px;
    width: 45%;
    min-width: 130px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
}

.card:hover {
    transform: scale(1.05);
    background-color: var(--card-hover);
    cursor: pointer;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.card h4 {
    margin-bottom: 8px;
    font-size: 1rem;
    font-weight: 600;
}

.card p {
    font-size: 1.2rem;
    font-weight: bold;
}

/* Loader */
.loader {
    border: 5px solid var(--loader-border);
    border-top: 5px solid var(--loader-top);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto;
    transition: border-color 0.3s ease;
}

.hidden {
    display: none;
}

@keyframes spin {
    100% {
        transform: rotate(360deg);
    }
}

/* Error text */
.error {
    color: var(--error-color);
    text-align: center;
    font-weight: bold;
}

/* Mobile fix */
@media (max-width: 500px) {
    .user-input-container {
        flex-direction: column;
        gap: 10px;
    }

    #user-input {
        width: 100%;
    }

    #search-button {
        width: 100%;
    }

    .circle {
        width: 100px;
        height: 100px;
    }
}