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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

/* ========== Container ========== */
.container {
    width: 100%;
    max-width: 500px;
}

/* ========== Converter Card ========== */
.converter-card {
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    animation: slideUp 0.5s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========== Header ========== */
.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 30px;
    text-align: center;
}

.header h1 {
    font-size: 28px;
    margin-bottom: 8px;
}

.subtitle {
    font-size: 14px;
    opacity: 0.9;
}

/* ========== Converter Body ========== */
.converter-body {
    padding: 30px;
}

/* ========== Input Groups ========== */
.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #333;
    font-size: 14px;
}

.input-group input,
.currency-select {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 16px;
    transition: all 0.3s ease;
    background: white;
}

.input-group input:focus,
.currency-select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.input-group input:hover,
.currency-select:hover {
    border-color: #667eea;
}

/* ========== Swap Button ========== */
.swap-container {
    display: flex;
    justify-content: center;
    margin: -10px 0;
}

.swap-btn {
    background: #667eea;
    color: white;
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 24px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.swap-btn:hover {
    background: #764ba2;
    transform: rotate(180deg);
}

.swap-btn:active {
    transform: rotate(180deg) scale(0.95);
}

/* ========== Convert Button ========== */
.convert-btn {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 10px;
}

.convert-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
}

.convert-btn:active {
    transform: translateY(0);
}

/* ========== Result Display ========== */
.result {
    margin-top: 25px;
    padding: 20px;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    border-radius: 10px;
    text-align: center;
    animation: fadeIn 0.5s ease;
}

.result-amount {
    font-size: 32px;
    font-weight: 700;
    color: #667eea;
    margin-bottom: 10px;
}

.exchange-rate {
    font-size: 14px;
    color: #666;
}

/* ========== Loading Spinner ========== */
.loading {
    margin-top: 25px;
    text-align: center;
    animation: fadeIn 0.3s ease;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    margin: 0 auto 15px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading p {
    color: #666;
    font-size: 14px;
}

/* ========== Error Message ========== */
.error {
    margin-top: 25px;
    padding: 15px;
    background: #fee;
    border: 2px solid #fcc;
    border-radius: 10px;
    color: #c33;
    text-align: center;
    animation: shake 0.5s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

/* ========== Utility Classes ========== */
.hidden {
    display: none;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========== Footer ========== */
.footer {
    background: #f8f9fa;
    padding: 20px;
    text-align: center;
    border-top: 1px solid #e0e0e0;
}

.footer p {
    font-size: 12px;
    color: #666;
    margin: 5px 0;
}

.creator {
    color: #667eea;
    font-weight: 600;
}

 
@media (max-width: 480px) {
    .header h1 {
        font-size: 24px;
    }
    
    .converter-body {
        padding: 20px;
    }
    
    .result-amount {
        font-size: 28px;
    }
}