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

:root{
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-input: #334155;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --border-color: #475569;
    --accent-primary: #3b82f6;
    --accent-hover: #2563eb;
}


body{
    background-color: var(--bg-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    font-family: "poppins", sans-serif;

}

.container {
    width: 100%;
    max-width: 400px;
    background-color: var(--bg-secondary);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

h1 {
    text-align: center;
    color: var(--text-primary);
    margin-bottom: 20px;
   
}

.form-group {
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 5px;
    color: var(--text-secondary);
}

input,
select {
    width: 100%;
    padding: 10px;
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 1rem;
    color: var(--text-primary);
}

input:focus,
select:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

button {
    width: 100%;
    padding: 12px;
    background-color: var(--accent-primary);
    color: #fff;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;

}

button:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
}

.swap-container {
    display: flex;
    justify-content: center;
    margin: 10px 0;
}

#swap-btn {
    background-color: var(--bg-input);
    border: 2px solid var(--border-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--text-primary);
}

#swap-btn:hover {
    background-color: var(--accent-primary);
    border-color: var(--accent-primary);
    transform: scale(1.1);
}

#swap-btn i {
    font-size: 1rem;
}

#convert-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

#convert-btn:disabled {
    background-color: var(--border-color);
    cursor: not-allowed;
    transform: none;
}

#result {
    margin-top: 20px;
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-primary);
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Loading animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--border-color);
    border-radius: 50%;
    border-top-color: var(--accent-primary);
    animation: spin 1s ease-in-out infinite;
    margin-right: 8px;
}

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

/* Error and success states */
.error-message {
    background-color: #dc2626 !important;
    color: white !important;
    padding: 15px;
    border-radius: 8px;
    text-align: center;
    margin-top: 10px;
}

.warning-message {
    background-color: #f59e0b !important;
    color: white !important;
    padding: 15px;
    border-radius: 8px;
    text-align: center;
    margin-top: 10px;
}

.success-message {
    background-color: var(--bg-input) !important;
    color: var(--text-primary) !important;
    padding: 15px;
    border-radius: 8px;
    text-align: center;
    margin-top: 10px;
}

/* Retry button styling */
.retry-btn {
    background: white !important;
    color: #dc2626 !important;
    border: none !important;
    padding: 8px 16px !important;
    border-radius: 4px !important;
    cursor: pointer !important;
    margin-top: 8px !important;
    font-size: 0.9rem !important;
    transition: all 0.2s ease !important;
}

.retry-btn:hover {
    background: #f3f4f6 !important;
    transform: translateY(-1px) !important;
}

/* Input validation states */
input:invalid {
    border-color: #dc2626 !important;
    box-shadow: 0 0 0 2px rgba(220, 38, 38, 0.2) !important;
}

input:valid {
    border-color: #10b981 !important;
}

/* Disabled state improvements */
button:disabled {
    background-color: var(--border-color) !important;
    cursor: not-allowed !important;
    transform: none !important;
    opacity: 0.6 !important;
}

select:disabled, input:disabled {
    opacity: 0.6 !important;
    cursor: not-allowed !important;
}

/* Responsive improvements */
@media (max-width: 480px) {
    .container {
        padding: 20px;
        margin: 10px;
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    input, select, button {
        padding: 12px;
        font-size: 1rem;
    }
}

/* Enhanced focus states */
input:focus, select:focus {
    transform: translateY(-1px);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1), 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Smooth transitions */
* {
    transition: all 0.2s ease;
}