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

:root {
    --primary-color: #00c6a0; /* Vivid accent */
    --secondary-color: #00e6b8;
    --success-color: #06d6a0;
    --error-color: #ff4d4f;
    --warning-color: #f59e0b;
    --bg-color: #0a0d14;
    --card-bg: #121826;
    --input-bg: #1a2233;
    --text-primary: #e6f0ff;
    --text-secondary: #9bb0cc;
    --border-color: #263247;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: radial-gradient(1000px 600px at 20% -10%, rgba(0,198,160,0.25), transparent),
                radial-gradient(1000px 600px at 80% 110%, rgba(0,230,184,0.2), transparent),
                linear-gradient(180deg, #0a0d14 0%, #0b101a 100%);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px 0;
}

header h1 {
    font-size: 2.2em;
    color: var(--text-primary);
    font-weight: 700;
    letter-spacing: -0.5px;
    margin-bottom: 6px;
}

header p {
    color: var(--text-secondary);
    font-size: 1.1em;
}

.exchange-card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 28px;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
    border: 1px solid var(--border-color);
}

.currency-group {
    margin-bottom: 25px;
}

.currency-group label {
    display: block;
    margin-bottom: 10px;
    color: var(--text-secondary);
    font-size: 0.9em;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.input-group {
    display: flex;
    gap: 10px;
}

.input-group input {
    flex: 1;
    padding: 15px;
    background: var(--input-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 1.2em;
    transition: all 0.3s;
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
}

.currency-select {
    padding: 15px 20px;
    background: var(--input-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 1em;
    cursor: pointer;
    transition: all 0.3s;
    min-width: 140px;
}

.currency-select:hover {
    border-color: var(--primary-color);
}

.currency-select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.currency-info {
    display: flex;
    justify-content: space-between;
    margin-top: 8px;
    font-size: 0.85em;
    color: var(--text-secondary);
}

.swap-btn {
    display: block;
    margin: 20px auto;
    padding: 12px 20px;
    background: var(--input-bg);
    border: 2px solid var(--border-color);
    border-radius: 50%;
    color: var(--text-primary);
    font-size: 1.5em;
    cursor: pointer;
    transition: all 0.3s;
    width: 50px;
    height: 50px;
}

.swap-btn:hover {
    background: var(--primary-color);
    transform: rotate(180deg);
}

.address-group {
    margin-bottom: 20px;
}

.address-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 0.9em;
}

.address-group input {
    width: 100%;
    padding: 12px;
    background: var(--input-bg);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 0.95em;
    transition: all 0.3s;
}

.address-group input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.exchange-btn {
    width: 100%;
    padding: 18px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border: none;
    border-radius: 12px;
    color: white;
    font-size: 1.1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.exchange-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.4);
}

.exchange-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.message {
    margin-top: 20px;
    padding: 12px;
    border-radius: 8px;
    display: none;
    font-size: 0.95em;
}

.message.success {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid var(--success-color);
    color: var(--success-color);
    display: block;
}

.message.error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--error-color);
    color: var(--error-color);
    display: block;
}

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-content {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 30px;
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    border: 1px solid var(--border-color);
}

.close {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 30px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color 0.3s;
}

.close:hover {
    color: var(--text-primary);
}

.modal h2 {
    color: var(--success-color);
    margin-bottom: 25px;
    text-align: center;
}

.exchange-details {
    margin-top: 20px;
}

.detail-row {
    display: flex;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

.mono {
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
    word-break: break-all;
}

.deposit-info {
    margin: 25px 0;
    padding: 20px;
    background: var(--input-bg);
    border-radius: 12px;
    border: 2px solid var(--border-color);
}

.deposit-info h3 {
    color: var(--primary-color);
    margin-bottom: 10px;
    font-size: 0.95em;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.amount-display,
.address-display {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
    padding: 12px;
    background: var(--bg-color);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.amount-display span,
.address-display span {
    flex: 1;
    word-break: break-all;
    color: var(--text-primary);
}

.copy-btn {
    padding: 8px;
    background: var(--primary-color);
    border: none;
    border-radius: 6px;
    color: white;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 1.2em;
}

.copy-btn:hover {
    background: var(--secondary-color);
}

.warning {
    padding: 12px;
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid var(--warning-color);
    border-radius: 8px;
    color: var(--warning-color);
    font-size: 0.9em;
    margin-top: 15px;
}

.timer {
    text-align: center;
    margin-top: 20px;
    padding: 10px;
    background: var(--bg-color);
    border-radius: 8px;
    color: var(--text-secondary);
}

.status {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85em;
    font-weight: 600;
    text-transform: uppercase;
}

.status.waiting {
    background: rgba(245, 158, 11, 0.2);
    color: var(--warning-color);
}

.status.confirming,
.status.exchanging,
.status.sending {
    background: rgba(99, 102, 241, 0.2);
    color: var(--primary-color);
}

.status.finished {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success-color);
}

.status.failed,
.status.expired,
.status.refunded {
    background: rgba(239, 68, 68, 0.2);
    color: var(--error-color);
}

.recent-exchanges {
    margin-top: 40px;
    background: var(--card-bg);
    border-radius: 20px;
    padding: 25px;
    border: 1px solid var(--border-color);
}

.recent-exchanges h3 {
    margin-bottom: 20px;
    color: var(--text-primary);
}

.exchange-item {
    padding: 12px;
    background: var(--input-bg);
    border-radius: 10px;
    margin-bottom: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: all 0.3s;
}

.exchange-item:hover {
    background: rgba(99, 102, 241, 0.1);
    transform: translateX(5px);
}

.exchange-item-info {
    flex: 1;
}

.exchange-item-pair {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.exchange-item-details {
    font-size: 0.85em;
    color: var(--text-secondary);
}

footer {
    text-align: center;
    margin-top: 40px;
    padding: 20px;
    color: var(--text-secondary);
    font-size: 0.9em;
}

/* Responsive Design */
@media (max-width: 640px) {
    .container {
        padding: 15px;
    }
    
    header h1 {
        font-size: 2em;
    }
    
    .exchange-card {
        padding: 20px;
    }
    
    .input-group {
        flex-direction: column;
    }
    
    .currency-select {
        width: 100%;
    }
}

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

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

/* Pulse Animation for Status */
@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.5; }
    100% { opacity: 1; }
}

.status.confirming,
.status.exchanging,
.status.sending {
    animation: pulse 2s ease-in-out infinite;
}