:root {
    --primary: #1a1a40;
    --primary-dark: #0f0f2b;
    --primary-light: #2e2e66;
    --secondary: #5e5ce6;
    --secondary-light: #7f7dfa;
    --accent: #ffd700;
    --accent-dark: #d4a017;
    --danger: #e63946;
    --success: #06d6a0;
    --success-dark: #05a87f;
    --light: #f8f1e9;
    --light-gray: #ececec;
    --dark: #121212;
    --gray: #adb5bd;
    --gold: #ffd700;
    --gold-light: #ffec99;
    --radius: 36px;
    --radius-sm: 24px;
    --shadow: 0 30px 80px rgba(0, 0, 0, 0.35);
    --shadow-sm: 0 20px 50px rgba(0, 0, 0, 0.25);
    --transition: all 0.6s cubic-bezier(0.22, 1, 0.36, 1);
    --transition-fast: all 0.4s ease-out;
}

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

body {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    min-height: 100vh;
    padding: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow-x: hidden;
    color: var(--light);
    font-family: 'Poppins', sans-serif;
    line-height: 1.8;
}

/* Loading Animation */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 1;
    transition: opacity 1.2s ease-out, visibility 1.2s;
    visibility: visible;
}

.loading-overlay.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.loader-container {
    position: relative;
    width: 160px;
    height: 160px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.loader {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: conic-gradient(
        from 0deg at 50% 50%,
        rgba(255, 215, 0, 0) 0%,
        var(--gold) 25%,
        var(--secondary) 50%,
        var(--primary-light) 75%,
        rgba(26, 26, 64, 0) 100%
    );
    animation: spin 1.4s linear infinite;
    filter: drop-shadow(0 0 20px rgba(255, 215, 0, 0.6));
}

.loader-inner {
    position: absolute;
    width: 85%;
    height: 85%;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.loader-icon {
    font-size: 44px;
    color: var(--gold);
    animation: pulse 2.2s infinite ease-in-out;
}

.loading-text {
    color: var(--light);
    margin-top: 40px;
    font-size: 32px;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    position: relative;
    font-family: 'Playfair Display', serif;
}

.loading-text::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(90deg, transparent, var(--gold), transparent);
    animation: loadingLine 2.2s infinite ease-in-out;
}

/* Container */
.container {
    width: 100%;
    max-width: 780px;
    margin: 0 auto;
    position: relative;
    perspective: 1400px;
}

.container::before,
.container::after {
    content: '';
    position: absolute;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(255, 215, 0, 0.25) 0%, rgba(255, 215, 0, 0) 70%);
    z-index: -1;
    opacity: 0.8;
    animation: float 6.5s ease-in-out infinite;
}

.container::before {
    top: -70px;
    left: -70px;
    animation-delay: 0s;
}

.container::after {
    bottom: -70px;
    right: -70px;
    animation-delay: 1.8s;
}

.payment-card {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(50px);
    -webkit-backdrop-filter: blur(50px);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    border: 1px solid rgba(255, 215, 0, 0.35);
    transition: var(--transition);
    transform-style: preserve-3d;
    animation: cardEntrance 1.4s cubic-bezier(0.22, 1, 0.36, 1) forwards;
    position: relative;
}

.payment-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 12px;
    background: linear-gradient(90deg, var(--gold), var(--secondary), var(--primary));
}

/* Card Header */
.card-header {
    padding: 70px 60px;
    text-align: center;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: var(--light);
    position: relative;
    overflow: hidden;
    box-shadow: inset 0 -20px 50px rgba(0, 0, 0, 0.2);
}

.card-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100" opacity="0.12"><path d="M0 0 L100 0 L100 100 L0 100 Z" fill="white"/></svg>');
    opacity: 0.18;
}

.card-header h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 25px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    letter-spacing: 2px;
    text-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
    font-family: 'Playfair Display', serif;
}

.card-header h1 i {
    margin-right: 25px;
    color: var(--gold);
    font-size: 52px;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.5));
    animation: heartbeat 2.2s infinite;
}

.card-header p {
    font-size: 22px;
    opacity: 0.9;
    letter-spacing: 1px;
    max-width: 90%;
    margin: 0 auto;
    font-family: 'Roboto Slab', serif;
}

/* Payment Form */
.payment-form {
    padding: 60px;
    background: linear-gradient(180deg, #ffffff 0%, var(--light-gray) 100%);
}

.form-group {
    margin-bottom: 40px;
    position: relative;
}

.form-group label {
    display: block;
    margin-bottom: 18px;
    font-size: 20px;
    font-weight: 600;
    color: var(--dark);
    position: relative;
    padding-left: 14px;
    font-family: 'Roboto Slab', serif;
}

.form-group label::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    height: 20px;
    width: 6px;
    background: var(--gold);
    border-radius: 4px;
}

.input-group {
    display: flex;
    gap: 25px;
    align-items: center;
}

input[type="text"],
input[type="number"],
textarea {
    width: 100%;
    padding: 22px 30px;
    border: 2px solid rgba(255, 215, 0, 0.35);
    border-radius: var(--radius-sm);
    font-size: 17px;
    transition: var(--transition-fast);
    background: rgba(255, 255, 255, 0.92);
    color: var(--dark);
    box-shadow: var(--shadow-sm);
    font-family: 'Poppins', sans-serif;
}

input[type="text"]:focus,
input[type="number"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--gold);
    box-shadow: 0 0 0 6px rgba(255, 215, 0, 0.25);
}

.input-prefix {
    display: flex;
    align-items: center;
    border: 2px solid rgba(255, 215, 0, 0.35);
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: rgba(255, 255, 255, 0.92);
    box-shadow: var(--shadow-sm);
}

.input-prefix span {
    padding: 0 30px;
    background: var(--gold);
    color: var(--dark);
    font-weight: 700;
    height: 100%;
    display: flex;
    align-items: center;
    border-right: 2px solid rgba(255, 215, 0, 0.45);
}

.input-prefix input {
    border: none;
    border-radius: 0;
    background: transparent;
    flex: 1;
    padding: 22px 30px;
}

/* Buttons */
.btn-anonymous, .btn-select {
    background: rgba(255, 255, 255, 0.92);
    color: var(--dark);
    border: 2px solid rgba(255, 215, 0, 0.35);
    border-radius: var(--radius-sm);
    padding: 22px;
    font-size: 17px;
    cursor: pointer;
    transition: var(--transition-fast);
    white-space: nowrap;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
    width: 100%;
}

.btn-anonymous:hover, .btn-select:hover {
    background: rgba(255, 215, 0, 0.25);
    border-color: var(--gold);
    transform: translateY(-3px);
}

.btn-anonymous.active {
    background: var(--secondary);
    color: white;
    border-color: var(--secondary);
}

.btn-anonymous.active i {
    color: white;
}

.btn-pay, .btn-check-status, .btn-done, .btn-cancel, .btn-history {
    border-radius: var(--radius-sm);
    padding: 24px;
    width: 100%;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-top: 30px;
    position: relative;
    overflow: hidden;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    border: none;
    box-shadow: var(--shadow);
    font-family: 'Roboto Slab', serif;
}

.btn-pay {
    background: linear-gradient(135deg, var(--gold) 0%, var(--gold-light) 100%);
    color: var(--dark);
}

.btn-pay:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(255, 215, 0, 0.6);
}

.btn-pay.processing {
    background: var(--gray);
    color: var(--dark);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-pay:active {
    transform: translateY(3px);
}

.btn-cancel {
    background: transparent;
    color: var(--danger);
    border: 2px solid var(--danger);
    margin-top: 25px;
}

.btn-cancel:hover {
    background: var(--danger);
    color: white;
}

.btn-check-status {
    background: linear-gradient(135deg, var(--secondary) 0%, var(--secondary-light) 100%);
    color: white;
}

.btn-check-status:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(94, 92, 230, 0.6);
}

.btn-check-status:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

.btn-done {
    background: linear-gradient(135deg, var(--success) 0%, var(--success-dark) 100%);
    color: white;
}

.btn-done:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(6, 214, 160, 0.6);
}

.btn-history {
    background: linear-gradient(135deg, var(--gray) 0%, var(--light-gray) 100%);
    color: var(--dark);
}

.btn-history:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(173, 181, 189, 0.6);
}

.btn-close {
    background: transparent;
    border: none;
    color: var(--gray);
    font-size: 28px;
    cursor: pointer;
    transition: var(--transition-fast);
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.btn-close:hover {
    color: var(--danger);
    background: rgba(230, 57, 70, 0.25);
    transform: rotate(90deg);
}

/* Payment Note */
.payment-note {
    background: rgba(255, 215, 0, 0.12);
    border-left: 6px solid var(--gold);
    padding: 30px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: flex-start;
    gap: 20px;
    margin-top: 40px;
    animation: fadeIn 0.8s ease;
    box-shadow: inset 0 0 30px rgba(255, 215, 0, 0.15);
}

.payment-note i {
    color: var(--gold);
    margin-top: 5px;
    font-size: 24px;
}

.payment-note p {
    font-size: 16px;
    color: var(--dark);
    line-height: 1.9;
}

/* Modal Styling */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
    padding: 30px;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.modal-content {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(50px);
    -webkit-backdrop-filter: blur(50px);
    border-radius: var(--radius);
    width: 100%;
    max-width: 560px;
    padding: 60px;
    box-shadow: var(--shadow);
    transform: translateY(50px) scale(0.9);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.modal-overlay.active .modal-content {
    transform: translateY(0) scale(1);
    opacity: 1;
}

.modal-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 12px;
    background: linear-gradient(90deg, var(--gold), var(--secondary), var(--primary));
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 40px;
}

.modal-header h2 {
    font-size: 32px;
    font-weight: 700;
    color: var(--dark);
    font-family: 'Playfair Display', serif;
}

/* Amount Options */
.amount-options, .payment-options {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.amount-option, .payment-option {
    background: white;
    border: 2px solid rgba(255, 215, 0, 0.35);
    border-radius: var(--radius-sm);
    padding: 20px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition-fast);
    font-weight: 600;
    color: var(--dark);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.amount-option:hover, .payment-option:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 25px rgba(255, 215, 0, 0.3);
    border-color: var(--gold);
}

.amount-option.selected, .payment-option.selected {
    background: var(--gold);
    color: var(--dark);
    border-color: var(--gold);
    transform: scale(1.05);
    box-shadow: 0 10px 25px rgba(255, 215, 0, 0.4);
}

/* QR Container */
.qr-container {
    text-align: center;
    margin-bottom: 40px;
    position: relative;
    background: rgba(255, 255, 255, 0.95);
    border-radius: var(--radius-sm);
    padding: 35px;
    box-shadow: var(--shadow);
    border: 2px solid rgba(255, 215, 0, 0.25);
}

.qr-loading {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.95);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 5;
    border-radius: var(--radius-sm);
}

.qr-loading i {
    font-size: 60px;
    color: var(--gold);
    margin-bottom: 30px;
    animation: spin 1.1s linear infinite;
}

.qr-loading p {
    font-size: 20px;
    color: var(--dark);
    font-weight: 600;
}

.qr-container img {
    width: 100%;
    max-width: 300px;
    border-radius: var(--radius-sm);
    border: 2px solid rgba(255, 215, 0, 0.45);
    padding: 25px;
    background: white;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    transition: var(--transition);
}

.qr-container img:hover {
    transform: scale(1.06);
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.2);
}

/* Payment Details */
.payment-details {
    background: rgba(255, 215, 0, 0.15);
    border-radius: var(--radius-sm);
    padding: 35px;
    margin-bottom: 35px;
    border: 2px solid rgba(255, 215, 0, 0.2);
}

.payment-info {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.info-item {
    display: flex;
    justify-content: space-between;
    font-size: 18px;
}

.info-item .label {
    color: var(--gray);
    font-weight: 500;
}

.info-item .value {
    font-weight: 600;
    color: var(--dark);
    text-align: right;
}

/* Success Animation */
.success-animation {
    text-align: center;
    margin-bottom: 40px;
    position: relative;
}

.success-animation i {
    font-size: 110px;
    color: var(--success);
    animation: scaleIn 0.9s cubic-bezier(0.4, 0, 0.2, 1) both;
}

.success-animation::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 160px;
    height: 160px;
    background: rgba(6, 214, 160, 0.2);
    border-radius: 50%;
    z-index: -1;
    animation: ripple 2s ease-out infinite;
}

.success-message {
    text-align: center;
    margin-bottom: 40px;
}

.success-message h2 {
    font-size: 36px;
    margin-bottom: 25px;
    color: var(--dark);
    font-family: 'Playfair Display', serif;
}

.success-message p {
    font-size: 18px;
    color: var(--gray);
    margin-bottom: 15px;
}

.success-wish {
    font-weight: 600;
    color: var(--gold);
    margin-top: 30px;
    font-style: italic;
    font-size: 22px;
}

/* History Container */
.history-container {
    max-height: 450px;
    overflow-y: auto;
    padding: 25px;
    background: rgba(255, 255, 255, 0.92);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
}

.history-item {
    display: flex;
    justify-content: space-between;
    padding: 20px;
    border-bottom: 1px solid rgba(255, 215, 0, 0.25);
    font-size: 17px;
    color: var(--dark);
}

.history-item:last-child {
    border-bottom: none;
}

.history-item .name {
    font-weight: 600;
}

.history-item .amount {
    color: var(--gold);
}

.history-item .date {
    color: var(--gray);
}

/* AI Service Chat */
.ai-service {
    position: fixed;
    top: 30px;
    right: 30px;
    z-index: 1000;
}

.ai-service-btn {
    background: linear-gradient(135deg, var(--gold) 0%, var(--gold-light) 100%);
    border: none;
    border-radius: var(--radius-sm);
    padding: 18px 30px;
    font-size: 18px;
    color: var(--dark);
    cursor: pointer;
    box-shadow: var(--shadow);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: 'Roboto Slab', serif;
}

.ai-service-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 12px 30px rgba(255, 215, 0, 0.6);
}

.ai-chat-container {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(50px);
    -webkit-backdrop-filter: blur(50px);
    border-radius: var(--radius);
    width: 480px;
    max-height: 600px;
    box-shadow: var(--shadow);
    overflow: hidden;
    margin-top: 20px;
    border: 1px solid rgba(255, 215, 0, 0.35);
}

.ai-chat-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    padding: 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--light);
}

.ai-chat-header h3 {
    font-size: 24px;
    font-family: 'Playfair Display', serif;
}

.ai-chat-messages {
    padding: 25px;
    max-height: 450px;
    overflow-y: auto;
    background: rgba(255, 255, 255, 0.92);
}

.ai-message {
    margin-bottom: 25px;
    padding: 20px;
    border-radius: var(--radius-sm);
    font-size: 16px;
    line-height: 1.7;
}

.ai-message.user {
    background: var(--gold);
    color: var(--dark);
    margin-left: 25%;
    border-bottom-right-radius: 0;
}

.ai-message.bot {
    background: var(--secondary);
    color: white;
    margin-right: 25%;
    border-bottom-left-radius: 0;
}

.ai-message.typing {
    background: var(--secondary-light);
    color: white;
    display: flex;
    align-items: center;
    gap: 10px;
}

.ai-message.typing .dots {
    display: flex;
    gap: 5px;
}

.ai-message.typing .dot {
    width: 8px;
    height: 8px;
    background: white;
    border-radius: 50%;
    animation: typing 1.2s infinite ease-in-out;
}

.ai-message.typing .dot:nth-child(2) {
    animation-delay: 0.2s;
}

.ai-message.typing .dot:nth-child(3) {
    animation-delay: 0.4s;
}

.ai-chat-input {
    display: flex;
    padding: 25px;
    background: rgba(255, 255, 255, 0.95);
    border-top: 1px solid rgba(255, 215, 0, 0.25);
}

.ai-chat-input input {
    flex: 1;
    border: none;
    background: transparent;
    padding: 18px;
    font-size: 17px;
    color: var(--dark);
}

.ai-chat-input input:focus {
    outline: none;
}

.btn-send {
    background: var(--gold);
    border: none;
    border-radius: var(--radius-sm);
    padding: 18px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--dark);
    transition: var(--transition-fast);
}

.btn-send:hover {
    background: var(--gold-light);
    transform: translateY(-3px);
}

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

@keyframes heartbeat {
    0% { transform: scale(1); }
    20% { transform: scale(1.3); }
    40% { transform: scale(1); }
    60% { transform: scale(1.3); }
    80% { transform: scale(1); }
    100% { transform: scale(1); }
}

@keyframes cardEntrance {
    from { 
        opacity: 0;
        transform: translateY(60px) rotateX(30deg);
    }
    to { 
        opacity: 1;
        transform: translateY(0) rotateX(0);
    }
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 0.8; }
    50% { transform: scale(1.2); opacity: 1; }
    100% { transform: scale(1); opacity: 0.8; }
}

@keyframes scaleIn {
    0% { transform: scale(0); opacity: 0; }
    70% { transform: scale(1.4); }
    100% { transform: scale(1); opacity: 1; }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes ripple {
    0% { transform: translate(-50%, -50%) scale(0.8); opacity: 1; }
    100% { transform: translate(-50%, -50%) scale(1.7); opacity: 0; }
}

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

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-25px); }
}

@keyframes typing {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 30px;
    }
    
    .card-header, .payment-form {
        padding: 40px;
    }
    
    .card-header h1 {
        font-size: 40px;
    }
    
    .modal-content {
        padding: 40px;
    }
    
    .ai-chat-container {
        width: 400px;
    }
}

@media (max-width: 480px) {
    .payment-card {
        border-radius: var(--radius-sm);
    }
    
    .card-header {
        padding: 40px 30px;
    }
    
    .payment-form {
        padding: 35px;
    }
    
    .input-group {
        flex-direction: column;
        gap: 25px;
    }
    
    .btn-anonymous {
        max-width: 100%;
        width: 100%;
    }
    
    .modal-content {
        padding: 35px;
    }
    
    .success-message h2 {
        font-size: 28px;
    }
    
    .ai-chat-container {
        width: 320px;
    }
}