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

:root {
    /* iOS-like Colors */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-card: rgba(255, 255, 255, 0.95);
    --bg-glass: rgba(255, 255, 255, 0.8);
    
    /* Text */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    
    /* Litecoin Accent */
    --ltc-primary: #345d9d;
    --ltc-light: #e8f2ff;
    --ltc-gold: #f59e0b;
    
    /* System Colors */
    --success: #10b981;
    --success-light: #ecfdf5;
    --error: #ef4444;
    --error-light: #fef2f2;
    
    /* Shadows (iOS style) */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.1);
    
    /* Border */
    --border: rgba(0, 0, 0, 0.08);
    --border-light: rgba(0, 0, 0, 0.04);
    
    /* Radius */
    --radius-sm: 8px;
    --radius: 12px;
    --radius-lg: 20px;
    --radius-xl: 24px;
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --spring: cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'San Francisco', system-ui, sans-serif;
    background: linear-gradient(180deg, var(--bg-primary) 0%, #ffffff 100%);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 16px;
    font-weight: 400;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 3rem;
    animation: slideDown 0.6s ease-out;
}

.logo {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--ltc-primary), var(--ltc-gold));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 1.8rem;
    color: white;
    font-weight: 600;
    box-shadow: var(--shadow);
    animation: float 4s ease-in-out infinite;
}

.title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* Main Layout */
.main-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

@media (min-width: 768px) {
    .main-grid {
        grid-template-columns: 1fr 1fr;
        gap: 3rem;
    }
}

/* Cards */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    padding: 2rem;
    box-shadow: var(--shadow);
    backdrop-filter: blur(20px);
    transition: var(--transition);
    animation: slideUp 0.6s ease-out;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* QR Section */
.qr-section {
    text-align: center;
}

.qr-wrapper {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin: 1.5rem 0;
    display: inline-block;
    box-shadow: var(--shadow-sm);
}

.qr-canvas {
    border-radius: var(--radius-sm);
}

.qr-label {
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    margin-top: 1rem;
}

/* Payment Details */
.payment-details {
    margin-top: 2rem;
}

.detail-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.2rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: var(--transition);
}

.detail-item:hover {
    border-color: var(--ltc-primary);
    background: var(--ltc-light);
}

.detail-icon {
    width: 40px;
    height: 40px;
    background: var(--ltc-light);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.detail-content {
    flex: 1;
    min-width: 0;
}

.detail-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
}

.detail-value {
    font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
    word-break: break-all;
}

.amount-value {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--ltc-primary);
}

/* Copy Button */
.copy-btn {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
}

.copy-btn:hover {
    background: var(--ltc-light);
    color: var(--ltc-primary);
    border-color: var(--ltc-primary);
}

.copy-btn.copied {
    background: var(--success-light);
    color: var(--success);
    border-color: var(--success);
    animation: bounce 0.4s var(--spring);
}

/* Verification Section */
.verification-section h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    text-align: center;
}

.info-banner {
    background: var(--ltc-light);
    border: 1px solid rgba(52, 93, 157, 0.2);
    border-radius: var(--radius);
    padding: 1.2rem;
    margin-bottom: 2rem;
    text-align: center;
}

.info-banner .highlight {
    font-weight: 600;
    color: var(--ltc-primary);
}

.info-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

/* Form */
.form-group {
    margin-bottom: 1.5rem;
}

.input-wrapper {
    position: relative;
}

.input-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 1rem;
}

input {
    width: 100%;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem 1rem 1rem 2.8rem;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
    font-size: 0.9rem;
    color: var(--text-primary);
    transition: var(--transition);
}

input:focus {
    outline: none;
    border-color: var(--ltc-primary);
    background: var(--ltc-light);
    box-shadow: 0 0 0 3px rgba(52, 93, 157, 0.1);
}

input::placeholder {
    color: var(--text-muted);
    font-family: 'Inter', sans-serif;
}

/* Button */
.verify-btn {
    width: 100%;
    background: var(--ltc-primary);
    border: none;
    border-radius: var(--radius);
    padding: 1rem 2rem;
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    box-shadow: var(--shadow-sm);
}

.verify-btn:hover {
    background: #2d4f87;
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

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

.verify-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Success State */
.success-state {
    text-align: center;
    padding: 2rem 1rem;
}

.success-icon {
    width: 60px;
    height: 60px;
    background: var(--success);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
    font-size: 1.8rem;
    box-shadow: var(--shadow);
    animation: bounceIn 0.6s var(--spring);
}

.success-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--success);
    margin-bottom: 0.5rem;
}

.success-text {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* Loading */
.loading-bar {
    width: 100%;
    height: 3px;
    background: var(--border-light);
    border-radius: 2px;
    overflow: hidden;
    margin-top: 1rem;
}

.loading-progress {
    height: 100%;
    background: var(--ltc-primary);
    border-radius: 2px;
    animation: loading 2s ease-in-out infinite;
}

/* Toast */
.toast {
    position: fixed;
    top: 2rem;
    right: 2rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem 1.5rem;
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(20px);
    transform: translateX(400px);
    transition: var(--transition);
    z-index: 1000;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    max-width: 400px;
}

.toast.show {
    transform: translateX(0);
}

.toast.success {
    border-left: 3px solid var(--success);
}

.toast.error {
    border-left: 3px solid var(--error);
}

.toast-icon {
    font-size: 1.2rem;
}

.toast-message {
    flex: 1;
    font-size: 0.9rem;
    font-weight: 500;
}

.toast-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1.1rem;
    padding: 0.2rem;
    transition: var(--transition);
}

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

/* Animations */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-6px);
    }
}

@keyframes bounce {
    0%, 20%, 53%, 80%, 100% {
        transform: scale(1);
    }
    40%, 43% {
        transform: scale(1.1);
    }
    70% {
        transform: scale(1.05);
    }
}

@keyframes bounceIn {
    0% {
        opacity: 0;
        transform: scale(0.3);
    }
    50% {
        opacity: 1;
        transform: scale(1.05);
    }
    70% {
        transform: scale(0.9);
    }
    100% {
        transform: scale(1);
    }
}

@keyframes loading {
    0% {
        transform: translateX(-100%);
    }
    100% {
        transform: translateX(100%);
    }
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.spin {
    animation: spin 1s linear infinite;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    .card {
        padding: 1.5rem;
    }

    .title {
        font-size: 1.8rem;
    }

    .toast {
        top: 1rem;
        right: 1rem;
        left: 1rem;
        max-width: none;
    }
}