/* ===== BtheK-AI Payment Page - Premium Design ===== */

/* ===== Reset & Base Styles ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette - Purple/Pink Theme (기존 서비스와 동일) */
    --primary-gradient: linear-gradient(135deg, #5e42a6 0%, #b74e91 100%);
    --secondary-gradient: linear-gradient(135deg, #b74e91 0%, #5e42a6 100%);
    --dark-bg: #312450;
    --darker-bg: #251a3d;
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-bg-hover: rgba(255, 255, 255, 0.08);
    --border-color: rgba(255, 255, 255, 0.12);
    --border-color-hover: rgba(255, 255, 255, 0.25);
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.5);
    --accent-pink: #b74e91;
    --accent-purple: #5e42a6;
    --accent-gold: #FFD700;
    --success-color: #4CAF50;
    --warning-color: #FF9800;
    --error-color: #f44336;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-pill: 3em;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.15);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.25);
    --glow-pink: 0 0 20px rgba(183, 78, 145, 0.3);
    --glow-purple: 0 0 20px rgba(94, 66, 166, 0.3);
}

body {
    font-family: "Source Sans Pro", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: linear-gradient(180deg, var(--dark-bg) 0%, var(--darker-bg) 100%);
    color: var(--text-primary);
    line-height: 1.6;
    font-weight: 400;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ===== Container ===== */
.payment-container {
    max-width: 480px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md) var(--spacing-lg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

/* ===== Header ===== */
.payment-header {
    text-align: center;
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.payment-header .header-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-xs);
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.3));
}

.payment-header h1 {
    font-size: 1.75rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.payment-header p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* ===== Back Button ===== */
.back-button {
    position: fixed;
    top: var(--spacing-md);
    left: var(--spacing-md);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-pill);
    color: var(--text-primary);
    padding: 0.6rem 1.2rem;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    z-index: 100;
}

.back-button:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: var(--border-color-hover);
    transform: translateX(-2px);
}

.back-button i {
    font-size: 0.9rem;
}

/* ===== Section Header ===== */
.section-header {
    margin-bottom: var(--spacing-sm);
}

.section-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.section-header h3 i {
    color: var(--accent-pink);
    font-size: 0.95rem;
}

.section-description {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* ===== Current Plan Info ===== */
.current-plan-info {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
}

.plan-info-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: var(--spacing-sm);
}

.plan-info-header i {
    color: var(--accent-purple);
    font-size: 1.1rem;
}

.plan-info-header h3 {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.plan-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.plan-badge {
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

.plan-badge.active {
    background: linear-gradient(135deg, rgba(76, 175, 80, 0.2) 0%, rgba(76, 175, 80, 0.1) 100%);
    color: var(--success-color);
    border: 1px solid rgba(76, 175, 80, 0.3);
}

.plan-badge.inactive {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
    border: 1px solid var(--border-color);
}

.plan-remaining {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* ===== Product Section ===== */
.product-section {
    background: transparent;
}

/* ===== Product Cards ===== */
.product-cards {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.product-card {
    position: relative;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    cursor: pointer;
    transition: all 0.3s ease;
    display: grid;
    grid-template-columns: auto 1fr auto;
    grid-template-rows: auto auto;
    gap: 0.5rem var(--spacing-sm);
    align-items: center;
}

.product-card:hover:not(.disabled) {
    border-color: var(--border-color-hover);
    background: var(--card-bg-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.product-card.selected {
    border-color: var(--accent-pink);
    background: linear-gradient(135deg, rgba(183, 78, 145, 0.15) 0%, rgba(94, 66, 166, 0.1) 100%);
    box-shadow: var(--glow-pink);
}

.product-card.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    filter: grayscale(30%);
}

.product-card.disabled:hover {
    transform: none;
    box-shadow: none;
}

/* Product Icon */
.product-icon {
    grid-row: span 2;
    font-size: 2.5rem;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
}

/* Product Title */
.product-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

/* Product Price */
.product-price {
    grid-row: span 2;
    text-align: right;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    justify-content: center;
}

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

.price-unit {
    font-size: 0.9rem;
    font-weight: 400;
    color: var(--text-secondary);
}

/* Product Description */
.product-description {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.4;
}

/* Product Badges */
.product-badge {
    position: absolute;
    top: -8px;
    right: var(--spacing-sm);
    padding: 0.3rem 0.7rem;
    border-radius: var(--radius-pill);
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.product-badge.recommended {
    background: linear-gradient(135deg, var(--accent-pink) 0%, var(--accent-purple) 100%);
    color: white;
    box-shadow: 0 2px 8px rgba(183, 78, 145, 0.4);
}

.product-badge.current {
    background: rgba(76, 175, 80, 0.2);
    color: var(--success-color);
    border: 1px solid rgba(76, 175, 80, 0.3);
}

.product-badge.upgrade {
    background: linear-gradient(135deg, var(--accent-gold) 0%, #FFA500 100%);
    color: #1a1a1a;
}

.product-badge.downgrade {
    background: rgba(255, 152, 0, 0.2);
    color: var(--warning-color);
    border: 1px solid rgba(255, 152, 0, 0.3);
}

/* Selection Indicator */
.product-card::after {
    content: '';
    position: absolute;
    top: 50%;
    right: var(--spacing-md);
    transform: translateY(-50%);
    width: 24px;
    height: 24px;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    transition: all 0.3s ease;
    display: none;
}

.product-card.selected::after {
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-pink);
    border-color: var(--accent-pink);
    content: '✓';
    color: white;
    font-size: 0.8rem;
    font-weight: bold;
}

/* ===== Upgrade Info ===== */
.upgrade-info {
    background: linear-gradient(135deg, rgba(94, 66, 166, 0.15) 0%, rgba(183, 78, 145, 0.15) 100%);
    border: 1px solid var(--accent-pink);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    animation: slideUp 0.3s ease-out;
}

.upgrade-info h4 {
    font-size: 0.95rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.upgrade-info h4 i {
    color: var(--accent-pink);
}

.discount-badge {
    background: linear-gradient(135deg, var(--accent-pink) 0%, var(--accent-purple) 100%);
    color: white;
    padding: 0.25rem 0.6rem;
    border-radius: var(--radius-sm);
    font-size: 0.7rem;
    font-weight: 700;
}

.upgrade-breakdown {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.breakdown-item {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.breakdown-item .discount {
    color: var(--accent-pink);
}

.breakdown-item.discount-rate {
    color: var(--accent-pink);
}

.breakdown-total {
    display: flex;
    justify-content: space-between;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    border-top: 1px solid var(--border-color);
    padding-top: 0.75rem;
    margin-top: 0.5rem;
}

/* ===== Payment Summary ===== */
.payment-summary {
    background: linear-gradient(135deg, rgba(94, 66, 166, 0.1) 0%, rgba(183, 78, 145, 0.1) 100%);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    text-align: center;
}

.summary-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: var(--spacing-sm);
}

.summary-header i {
    color: var(--accent-purple);
}

.summary-header h3 {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.total-amount {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 0.25rem;
    margin-bottom: 0.5rem;
}

.total-amount .amount-number {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-pink) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.total-amount .amount-unit {
    font-size: 1.2rem;
    font-weight: 400;
    color: var(--text-secondary);
}

.summary-note {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ===== Toss Payment Widget ===== */
.toss-widget-wrapper {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
}

#payment-method {
    margin-top: var(--spacing-sm);
    min-height: 100px;
}

#agreement {
    margin-top: var(--spacing-sm);
}

/* Payment Method Placeholder */
.payment-method-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-md);
    border: 1px dashed var(--border-color);
}

.placeholder-loading {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.loading-spinner-small {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-top-color: var(--accent-pink);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.placeholder-error {
    text-align: center;
    padding: var(--spacing-md);
}

.placeholder-error i {
    font-size: 2rem;
    color: var(--warning-color);
    margin-bottom: 0.5rem;
    display: block;
}

.placeholder-error p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

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

/* ===== Benefits Section ===== */
.benefits-section {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
}

.benefits-section h4 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.benefits-section h4 i {
    color: var(--success-color);
}

.benefits-list {
    list-style: none;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

.benefits-list li {
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.benefits-list li i {
    color: var(--accent-pink);
    font-size: 0.9rem;
    width: 16px;
}

/* ===== Buttons ===== */
.button-group {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.btn {
    flex: 1;
    padding: 1rem 1.5rem;
    border-radius: var(--radius-lg);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    text-align: center;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-pink) 0%, var(--accent-purple) 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(183, 78, 145, 0.4);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(183, 78, 145, 0.5);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-secondary {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-secondary:hover {
    border-color: var(--border-color-hover);
    background: rgba(255, 255, 255, 0.05);
}

/* ===== Security Notice ===== */
.security-notice {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: var(--spacing-sm);
    font-size: 0.8rem;
    color: var(--text-muted);
}

.security-notice i {
    color: var(--success-color);
}

/* ===== Loading Overlay ===== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(37, 26, 61, 0.95);
    backdrop-filter: blur(5px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-pink);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-text {
    margin-top: var(--spacing-md);
    color: var(--text-secondary);
    font-size: 1rem;
}

/* ===== Error Modal ===== */
.error-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1001;
}

.error-modal-content {
    background: var(--dark-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    max-width: 360px;
    width: 90%;
    text-align: center;
    animation: slideUp 0.3s ease-out;
}

.error-icon {
    font-size: 3rem;
    color: var(--error-color);
    margin-bottom: var(--spacing-sm);
}

.error-modal-content h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.error-modal-content p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.5;
}

.error-modal-content .btn {
    width: 100%;
}

/* ===== Success/Error Pages ===== */
.result-container {
    max-width: 480px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md);
    text-align: center;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.result-icon {
    font-size: 5rem;
    margin-bottom: var(--spacing-md);
}

.result-icon.success {
    color: var(--success-color);
}

.result-icon.error {
    color: var(--error-color);
}

.result-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.result-message {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.result-details {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    width: 100%;
    text-align: left;
}

.result-details .detail-row {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.result-details .detail-row:last-child {
    border-bottom: none;
}

.result-details .detail-label {
    color: var(--text-secondary);
}

.result-details .detail-value {
    color: var(--text-primary);
    font-weight: 600;
}

/* ===== Responsive ===== */
@media screen and (max-width: 480px) {
    .payment-container {
        padding: calc(var(--spacing-xl) + 40px) var(--spacing-sm) var(--spacing-md);
    }
    
    .payment-header h1 {
        font-size: 1.5rem;
    }
    
    .product-card {
        padding: var(--spacing-sm);
        gap: 0.4rem var(--spacing-xs);
    }
    
    .product-icon {
        font-size: 2rem;
        width: 50px;
        height: 50px;
    }
    
    .product-title {
        font-size: 1rem;
    }
    
    .price-amount {
        font-size: 1.2rem;
    }
    
    .product-description {
        font-size: 0.8rem;
    }
    
    .total-amount .amount-number {
        font-size: 2rem;
    }
    
    .benefits-list {
        grid-template-columns: 1fr;
    }
    
    .btn {
        padding: 0.9rem 1rem;
        font-size: 0.85rem;
    }
    
    .back-button {
        top: var(--spacing-sm);
        left: var(--spacing-sm);
        padding: 0.5rem 1rem;
        font-size: 0.8rem;
    }
}

/* ===== Animations ===== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.02); }
}

.animate-fade-in {
    animation: fadeIn 0.3s ease-out;
}

.animate-slide-up {
    animation: slideUp 0.4s ease-out;
}

.product-card.selected {
    animation: pulse 2s ease-in-out infinite;
}