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

/* Light Mode (Default) */
body {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    padding: 2rem;
    transition: 0.3s ease;
}

.container {
    max-width: 850px;
    margin: auto;
    background: white;
    padding: 2.5rem;
    border-radius: 24px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
    color: #1e293b;
    transition: 0.3s ease;
}

/* Dark Mode */
body.dark {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
}

body.dark .container {
    background: #1e1e2f;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    color: #e2e8f0;
    border: 1px solid rgba(255,255,255,0.1);
}

/* Top Bar */
.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.top-bar h1 {
    margin: 0;
    font-size: 2.5rem;
    background: linear-gradient(135deg, #667eea, #764ba2);
    background-clip: text;
    color: transparent;
    font-weight: 700;
}

body.dark .top-bar h1 {
    background: linear-gradient(135deg, #a8b8ff, #d4a8ff);
    background-clip: text;
    color: transparent;
}

.subtitle {
    margin: 5px 0 25px 0;
    font-size: 1.1rem;
    color: #64748b;
}

body.dark .subtitle {
    color: #a0aec0;
}

/* Labels */
label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    font-size: 1rem;
    color: #334155;
}

body.dark label {
    color: #cbd5e0;
}

/* Input field */
input {
    width: 100%;
    padding: 14px;
    border-radius: 12px;
    border: 2px solid #e2e8f0;
    outline: none;
    background: white;
    color: #1e293b;
    font-size: 1rem;
    box-sizing: border-box;
    margin-bottom: 20px;
    transition: 0.3s;
}

input:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

input::placeholder {
    color: #94a3b8;
}

body.dark input {
    background: #2d2d44;
    border-color: #3a3a5a;
    color: #e2e8f0;
}

body.dark input:focus {
    border-color: #a8b8ff;
    box-shadow: 0 0 0 3px rgba(168, 184, 255, 0.1);
}

/* Dropdown */
select {
    width: 100%;
    padding: 14px;
    border-radius: 12px;
    border: 2px solid #e2e8f0;
    outline: none;
    background: white;
    color: #1e293b;
    font-size: 1rem;
    box-sizing: border-box;
    margin-bottom: 20px;
    cursor: pointer;
    transition: 0.3s;
}

select:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* Dropdown options */
select option {
    background: white;
    color: #1e293b;
    padding: 12px;
}

body.dark select {
    background: #2d2d44;
    border-color: #3a3a5a;
    color: #e2e8f0;
}

body.dark select option {
    background: #2d2d44;
    color: #e2e8f0;
}

/* Button */
button {
    width: 100%;
    padding: 16px;
    border-radius: 12px;
    border: none;
    font-weight: 700;
    font-size: 1.1rem;
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    cursor: pointer;
    transition: 0.3s;
    margin: 10px 0 20px 0;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

button:active {
    transform: translateY(0);
}

body.dark button {
    background: linear-gradient(45deg, #5a67d8, #805ad5);
    box-shadow: 0 4px 15px rgba(90, 103, 216, 0.3);
}

/* Output boxes */
.output {
    margin-top: 20px;
    padding: 20px;
    border-radius: 16px;
    background: #f8fafc;
    border: 2px solid #e2e8f0;
    color: #1e293b;
}

.output h3 {
    margin-top: 0;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid #e2e8f0;
    color: #334155;
}

body.dark .output {
    background: #2d2d44;
    border-color: #3a3a5a;
    color: #e2e8f0;
}

body.dark .output h3 {
    border-bottom-color: #3a3a5a;
    color: #cbd5e0;
}

/* Quiz section */
.quiz {
    margin-top: 20px;
}

.quiz label {
    display: inline-block;
    margin: 5px 15px 5px 5px;
    font-weight: normal;
    color: #475569;
}

body.dark .quiz label {
    color: #a0aec0;
}

.quiz input[type="radio"] {
    width: auto;
    margin-right: 8px;
    accent-color: #667eea;
}
.correct {
    color: green;
    font-weight: bold;
}
body.dark .correct{
    color: rgb(17, 163, 17);
}

.wrong {
    color: red;
    font-weight: bold;
}
body.dark .wrong{
    color: rgb(231, 33, 33);
}
.score-card{
    margin-top:20px;
    padding:15px;
    background:#f2f6ff;
    border-radius:10px;
    border: 2px solid #e2e8f0;
    font-size:19px;
    font-weight:bold;
    text-align:center;
}
body.dark .score-card {
    background: #27273d;
    border-color: #3a3a5a;
    color: #e2e8f0;
}

body.dark .score-card h3 {
    border-bottom-color: #3a3a5a;
    color: #cbd5e0;
    
}


.score-good{
    margin-top: 6px;
    color:green;
    margin-bottom: 10px;
}

.score-average{
    margin-top: 6px;
    color:orange;
    margin-bottom: 10px;
}

.score-bad{
    margin-top: 6px;
    color:red;
    margin-bottom: 10px;
}

/* History section */
#history {
    margin-top: 30px;
}

#history h3 {
    color: #334155;
    margin-bottom: 15px;
}

body.dark #history h3 {
    color: #cbd5e0;
}

#history p {
    background: #f1f5f9;
    padding: 10px 20px;
    border-radius: 30px;
    display: inline-block;
    margin: 5px;
    cursor: pointer;
    transition: 0.3s;
    color: #1e293b;
    border: 2px solid transparent;
    font-weight: 500;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

#history p:hover {
    background: #e2e8f0;
    transform: translateY(-2px);
    border-color: #667eea;
}

body.dark #history p {
    background: #3a3a5a;
    color: #e2e8f0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

body.dark #history p:hover {
    background: #4a4a6a;
    border-color: #a8b8ff;
}
.clear-btn{
  margin-top:20px;
  padding:8px 16px;
  border:none;
  background: linear-gradient(45deg, #667eea, #764ba2);
  color:white;
  border-radius:6px;
  cursor:pointer;
}
.clear-btn:active{
    transform: translateY(0);
}

.clear-btn:hover{
  box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
  transform: translateY(-2px);
}
body.dark .clear-btn {
    background: linear-gradient(45deg, #5a67d8, #805ad5);
    box-shadow: 0 4px 15px rgba(90, 103, 216, 0.3);
}

/* Loader */
.loader {
    display: none;
    border: 5px solid #f1f5f9;
    border-top: 5px solid #667eea;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

body.dark .loader {
    border: 5px solid #3a3a5a;
    border-top: 5px solid #a8b8ff;
}

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

/* Toggle Switch */
.switch {
    position: relative;
    display: inline-block;
    width: 80px;
    height: 40px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
    margin: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    background-color: #cbd5e0;
    border-radius: 34px;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    transition: 0.4s;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.slider:before {
    position: absolute;
    content: "🌙";
    height: 34px;
    width: 34px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    border-radius: 50%;
    transition: 0.4s;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

input:checked + .slider {
    background-color: #667eea;
}

input:checked + .slider:before {
    transform: translateX(40px);
    content: "☀️";
}

body.dark .slider {
    background-color: #4a4a6a;
}

body.dark .slider:before {
    background-color: #2d2d44;
    color: #ffd700;
}

/* Hover effect */
.slider:hover:before {
    transform: scale(1.1);
}

input:checked + .slider:hover:before {
    transform: translateX(40px) scale(1.1);
}

/* Responsive */
@media (max-width: 600px) {
    body {
        padding: 1rem;
    }
    
    .container {
        padding: 1.5rem;
    }
    
    .top-bar {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    
    .top-bar h1 {
        font-size: 2rem;
    }
}

/* Light mode specific */
body:not(.dark) .container {
    background: white;
}

body:not(.dark) input,
body:not(.dark) select {
    background: white;
}