:root {
    --primary: #5865f2;
    --primary-soft: #eef0ff;
    --primary-hover: #4752c4;
    --bg-light: #f4f7fa;
    --card-bg: #ffffff;
    --text-dark: #2d3748;
    --text-muted: #718096;
    --border-soft: #edf2f7;
    --border-active: #cbd5e0;
    --input-bg: #fdfdfd;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
    background-color: var(--bg-light);
    color: var(--text-dark);
    display: flex;
    justify-content: center;
    padding: 40px 15px;
    min-height: 100vh;
}

.page-wrapper {
    width: 100%;
    max-width: 850px;
    animation: fadeIn 0.8s ease-out;
}

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

/* Info Bar */
.info-bar {
    background: #ffffff;
    border-radius: 20px;
    padding: 15px 20px;
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 25px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.03);
    border: 1px solid var(--border-soft);
}

@media (max-width: 600px) {
    .info-bar {
        flex-direction: column;
        text-align: center;
        padding: 15px;
        gap: 10px;
    }
    .info-logo img {
        width: 40px;
        height: 40px;
    }
    .info-text {
        font-size: 0.8rem;
    }
}

.info-logo img {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    object-fit: cover;
}

.info-text {
    font-size: 0.92rem;
    color: var(--text-dark);
    line-height: 1.4;
}

/* Main Card */
.main-card {
    background: var(--card-bg);
    border-radius: 30px;
    padding: 45px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.04), 0 5px 15px rgba(0,0,0,0.02);
    border: 1px solid var(--border-soft);
}

.card-header {
    text-align: center;
    margin-bottom: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.agency-logo img {
    width: 64px;
    height: 64px;
    border-radius: 18px;
    margin-bottom: 12px;
    border: 1px solid var(--border-soft);
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}

.conversion-indicator {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 40px;
    padding: 10px;
    transition: all 0.3s;
    width: 100%;
}

/* Responsive cho màn hình nhỏ */
@media (max-width: 600px) {
    .conversion-indicator {
        gap: 15px;
    }
    .indicator-group {
        width: 80px !important;
    }
    .indicator-logo {
        width: 50px !important;
        height: 50px !important;
    }
    .indicator-middle {
        height: 50px !important;
        gap: 8px !important;
    }
    .diamond-count {
        font-size: 1.3rem !important;
    }
    .arrow {
        font-size: 1.1rem !important;
    }
    .agency-name {
        font-size: 0.75rem !important;
        white-space: normal !important;
    }
}

.indicator-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    width: 110px;
}

.indicator-middle {
    display: flex;
    align-items: center;
    gap: 12px;
    height: 65px;
}

.indicator-logo {
    width: 65px;
    height: 65px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #fff;
    border: 1px dashed #cbd5e0;
    padding: 5px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.03);
}

.indicator-logo img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
}

.agency-name {
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--text-dark);
    margin: 0;
    text-align: center;
    line-height: 1.2;
}

.agency-name.placeholder {
    visibility: hidden;
}

.diamond-count {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.arrow {
    font-size: 1.6rem;
    color: #a0aec0;
    opacity: 0.6;
}

/* App Switcher */
.app-switcher {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 40px;
}

.switch-btn {
    padding: 10px 30px;
    border-radius: 50px;
    border: 1px solid var(--border-soft);
    background: #fff;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 0.95rem;
    color: var(--text-muted);
}

.switch-btn:hover {
    background: var(--primary-soft);
    color: var(--primary);
}

.switch-btn.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
    box-shadow: 0 10px 20px rgba(88, 101, 242, 0.2);
}

/* Form Layout */
.form-row {
    display: flex;
    gap: 24px;
    margin-bottom: 25px;
}

.flex-1 {
    flex: 1;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 12px;
    font-size: 0.95rem;
    color: var(--text-dark);
}

.label-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.hint {
    font-size: 0.8rem;
    color: var(--text-muted);
}

input {
    width: 100%;
    padding: 14px 20px;
    border-radius: 16px;
    border: 1px solid var(--border-soft);
    background: var(--input-bg);
    font-size: 1rem;
    outline: none;
    transition: all 0.3s;
    color: var(--text-dark);
}

input:focus {
    border-color: var(--primary);
    background: #fff;
    box-shadow: 0 0 0 4px var(--primary-soft);
}

.input-wrapper {
    position: relative;
}

.suffix-icon {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    opacity: 0.6;
}

/* Package Grid */
.package-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 16px;
    margin: 30px 0;
}

.package-item {
    background: #fff;
    border: 1px solid var(--border-soft);
    border-radius: 20px;
    padding: 22px 10px;
    text-align: center;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 2px 5px rgba(0,0,0,0.01);
}

.package-item:hover {
    border-color: var(--primary);
    transform: translateY(-5px);
    box-shadow: 0 12px 25px rgba(0,0,0,0.05);
}

.package-item.selected {
    border-color: var(--primary);
    background: linear-gradient(135deg, var(--primary-soft) 0%, #ffffff 100%);
    box-shadow: 0 8px 20px rgba(88, 101, 242, 0.1);
    transform: scale(1.05);
}

.pkg-price-large {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--primary);
}

/* Receive Box */
.receive-box {
    background: var(--primary-soft);
    border-radius: 20px;
    padding: 20px 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    border: 1px solid rgba(88, 101, 242, 0.1);
}

.receive-label {
    font-weight: 600;
    color: var(--primary);
    font-size: 1rem;
}

.receive-value {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.7rem;
    font-weight: 800;
    color: var(--primary);
}

/* Button */
.btn-confirm {
    width: 100%;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 50px;
    padding: 16px;
    font-size: 1.05rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    transition: all 0.3s;
    box-shadow: 0 10px 25px rgba(88, 101, 242, 0.3);
}

.btn-confirm:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 15px 30px rgba(88, 101, 242, 0.4);
}

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

/* QR Result */
.qr-result-container {
    margin-top: 40px;
    padding: 30px;
    border-radius: 24px;
    background: #fff;
    border: 2px dashed var(--border-soft);
    text-align: center;
    animation: slideUp 0.6s ease;
}

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

#qr-image {
    width: 220px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    margin: 20px 0;
}

/* Mobile Responsive */
@media (max-width: 650px) {
    .main-card {
        padding: 30px 20px;
        border-radius: 24px;
    }
    
    .form-row {
        flex-direction: column;
        gap: 20px;
    }
    
    .hero-title {
        font-size: 2.2rem;
    }
    
    .package-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .receive-box {
        padding: 15px 20px;
    }
    
    .receive-value {
        font-size: 1.4rem;
    }
    
    .conversion-indicator {
        gap: 15px;
        padding: 8px 15px;
    }
}