:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --accent-gradient: linear-gradient(135deg, #2563eb 0%, #3b82f6 50%, #1d4ed8 100%);
    --bg-gradient: radial-gradient(circle at 15% 15%, #496da8 0%, #0f172a 50%, #5478ce 100%);
    --card-bg: #ffffff;
    --text-color: #1e293b;
    --border-color: #e2e8f0;
    --error-color: #ef4444;
    --success-color: #10b981;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background: var(--bg-gradient);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px 16px;
    color: var(--text-color);
}

.payment-container {
    width: 100%;
    max-width: 560px;
    background: var(--card-bg);
    border-radius: 20px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(255, 255, 255, 0.08);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.payment-header {
    background: linear-gradient(180deg, #0f172a 0%, #1e293b 100%);
    color: #ffffff;
    padding: 32px 28px 26px 28px;
    text-align: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    position: relative;
}

.ror-logo-wrapper {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 84px;
    height: 84px;
    border-radius: 50%;
    background: #ffffff;
    padding: 6px;
    box-shadow: 0 10px 25px rgba(37, 99, 235, 0.35), 0 0 0 4px rgba(255, 255, 255, 0.15);
    margin-bottom: 16px;
    transition: transform 0.3s ease;
}

.ror-logo-wrapper:hover {
    transform: scale(1.05);
}

.ror-logo {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 50%;
}

.merchant-badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    background: rgba(37, 99, 235, 0.25);
    color: #60a5fa;
    margin-bottom: 10px;
    border: 1px solid rgba(96, 165, 250, 0.35);
    backdrop-filter: blur(4px);
}

.badge-icon {
    width: 14px;
    height: 14px;
    stroke-width: 3;
}

.payment-header h1 {
    font-size: 1.6rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 6px;
    background: linear-gradient(135deg, #ffffff 0%, #cbd5e1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.payment-header p {
    font-size: 0.875rem;
    color: #94a3b8;
    font-weight: 500;
}

.gateway-tabs {
    display: flex;
    background: #f8fafc;
    border-bottom: 1px solid var(--border-color);
    overflow-x: auto;
    scrollbar-width: none;
}

.gateway-tabs::-webkit-scrollbar {
    display: none;
}

.tab-btn {
    flex: 1;
    min-width: 110px;
    padding: 16px 12px;
    border: none;
    background: transparent;
    font-size: 0.85rem;
    font-weight: 600;
    color: #64748b;
    cursor: pointer;
    transition: all 0.25s ease;
    border-bottom: 3px solid transparent;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

.tab-btn:hover {
    color: var(--primary);
    background: #f1f5f9;
}

.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
    background: #ffffff;
    font-weight: 700;
}

.tab-btn svg {
    width: 22px;
    height: 22px;
    transition: transform 0.2s ease;
}

.tab-btn:hover svg, .tab-btn.active svg {
    transform: translateY(-2px);
}

.payment-body {
    padding: 32px 28px;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: slideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: #334155;
    margin-bottom: 6px;
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    font-size: 0.95rem;
    font-weight: 500;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    background: #f8fafc;
    color: var(--text-color);
    outline: none;
    transition: all 0.2s ease;
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
    background: #ffffff;
}

.form-row {
    display: flex;
    gap: 14px;
}

.form-row .form-group {
    flex: 1;
}

.input-hint {
    font-size: 0.75rem;
    color: #64748b;
    margin-top: 5px;
}

.form-control.is-invalid {
    border-color: var(--error-color);
    box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.12);
}

.btn-submit {
    width: 100%;
    padding: 15px;
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.01em;
    color: #ffffff;
    background: var(--accent-gradient);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    box-shadow: 0 4px 14px 0 rgba(37, 99, 235, 0.35);
    transition: all 0.2s ease;
    margin-top: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-submit:hover {
    box-shadow: 0 6px 20px 0 rgba(37, 99, 235, 0.45);
    transform: translateY(-1px);
}

.btn-submit:active {
    transform: translateY(0);
    box-shadow: 0 2px 8px 0 rgba(37, 99, 235, 0.35);
}

.btn-submit:disabled {
    background: #cbd5e1;
    box-shadow: none;
    cursor: not-allowed;
    transform: none;
}

.alert {
    padding: 14px 18px;
    border-radius: 10px;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 22px;
    display: none;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.alert-danger {
    background: #fef2f2;
    border: 1px solid #fecaca;
    color: #991b1b;
}

.alert-success {
    background: #ecfdf5;
    border: 1px solid #a7f3d0;
    color: #065f46;
}

.alert-warning {
    background: #fffbeb;
    border: 1px solid #fde68a;
    color: #92400e;
}

.spinner {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #ffffff;
    animation: spin 0.8s linear infinite;
    display: inline-block;
}

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

.payment-footer {
    padding: 16px 28px;
    background: #f8fafc;
    border-top: 1px solid var(--border-color);
    text-align: center;
    font-size: 0.82rem;
    color: #64748b;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.secure-icon {
    width: 16px;
    height: 16px;
    color: #10b981;
}

/* Stripe Modal Styling */
.modal-content {
    border-radius: 16px;
    border: none;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.35);
    overflow: hidden;
}

.modal-header {
    background: #f8fafc;
    border-bottom: 1px solid var(--border-color);
    padding: 18px 24px;
}

.modal-body {
    padding: 24px;
}