/* ===== Apple-inspired Black & White Design ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Modern colorful palette */
    --primary-blue: #0066FF;
    --primary-blue-dark: #0052CC;
    --primary-purple: #6366F1;
    --primary-green: #10B981;
    --primary-orange: #F59E0B;
    --primary-red: #EF4444;
    --accent-cyan: #06B6D4;
    --accent-pink: #EC4899;
    
    --primary-white: #ffffff;
    --secondary-white: #F8FAFC;
    --tertiary-white: #F1F5F9;
    --border-light: #E2E8F0;
    --border-medium: #CBD5E1;
    
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-tertiary: #94A3B8;
    
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.12);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue', 'Noto Sans KR', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-attachment: fixed;
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 16px;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    margin: 0;
    padding: 0;
}

/* ===== Top Banner ===== */
.top-banner {
    background: linear-gradient(135deg, #FF6B6B, #FFE66D);
    padding: 12px 0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    animation: slideDown 0.5s ease;
}

@keyframes slideDown {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.banner-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    position: relative;
}

.banner-icon {
    font-size: 24px;
    animation: bounce 2s infinite;
}

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

.banner-text {
    color: var(--text-primary);
    font-size: 15px;
    margin: 0;
    text-align: center;
}

.banner-text strong {
    font-weight: 700;
    color: #D32F2F;
}

.banner-close {
    position: absolute;
    right: 10px;
    background: none;
    border: none;
    font-size: 28px;
    color: var(--text-primary);
    cursor: pointer;
    line-height: 1;
    padding: 0 10px;
    opacity: 0.7;
    transition: opacity 0.3s ease;
}

.banner-close:hover {
    opacity: 1;
}

.container {
    max-width: 980px;
    margin: 0 auto;
    padding: 0 22px;
}

/* ===== Header ===== */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 30px 0 25px 0;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    margin-bottom: 40px;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 8px;
}

.logo i {
    font-size: 32px;
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo h1 {
    font-size: 36px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 16px;
    font-weight: 500;
    line-height: 1.4;
    margin-bottom: 6px;
}

.header-description {
    text-align: center;
    color: var(--text-tertiary);
    font-size: 14px;
    font-weight: 400;
    line-height: 1.5;
    max-width: 600px;
    margin: 0 auto;
}

/* ===== Main Content ===== */
.main-content {
    padding: 60px 0 100px 0;
}

/* ===== Platform Section ===== */
.platform-section {
    background: transparent;
    padding: 0 0 40px 0;
    margin-bottom: 40px;
}

.platform-section h2 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 30px;
    text-align: center;
    color: var(--primary-white);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.platform-section h2 i {
    color: var(--primary-white);
    font-size: 28px;
}

.platform-buttons {
    display: flex;
    flex-wrap: nowrap;
    gap: 12px;
    max-width: 100%;
    margin: 0 auto;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 5px 0;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: var(--border-medium) transparent;
    justify-content: center;
    align-items: center;
}

/* 7개 버튼이 모두 들어갈 수 있는 경우 중앙 정렬 유지 */
@media (min-width: 900px) {
    .platform-buttons {
        justify-content: center;
        flex-wrap: wrap;
    }
}

/* 화면이 작아서 스크롤이 필요한 경우 */
@media (max-width: 899px) {
    .platform-buttons {
        justify-content: flex-start;
    }
}

.platform-buttons::-webkit-scrollbar {
    height: 6px;
}

.platform-buttons::-webkit-scrollbar-track {
    background: transparent;
}

.platform-buttons::-webkit-scrollbar-thumb {
    background: var(--border-medium);
    border-radius: 3px;
}

.platform-buttons::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

.platform-btn {
    background: var(--primary-white);
    border: none;
    border-radius: 16px;
    padding: 20px 16px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    min-width: 100px;
    flex-shrink: 0;
}

.platform-btn i {
    font-size: 28px;
    transition: all 0.3s ease;
}

.platform-btn[data-platform="amazon"] i { color: #FF9900; }
.platform-btn[data-platform="shopee"] i { color: #EE4D2D; }
.platform-btn[data-platform="ebay"] i { color: #E53238; }
.platform-btn[data-platform="lazada"] i { color: #0F156D; }
.platform-btn[data-platform="qoo10"] i { color: #E4007F; }
.platform-btn[data-platform="rakuten"] i { color: #BF0000; }
.platform-btn[data-platform="aliexpress"] i { color: #FF6A00; }

.platform-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 0;
}

.platform-btn[data-platform="amazon"]::before { background: linear-gradient(135deg, #FF9900, #FFB84D); }
.platform-btn[data-platform="shopee"]::before { background: linear-gradient(135deg, #EE4D2D, #FF6B46); }
.platform-btn[data-platform="ebay"]::before { background: linear-gradient(135deg, #E53238, #F0484F); }
.platform-btn[data-platform="lazada"]::before { background: linear-gradient(135deg, #0F156D, #1A1F8C); }
.platform-btn[data-platform="qoo10"]::before { background: linear-gradient(135deg, #E4007F, #FF1A9E); }
.platform-btn[data-platform="rakuten"]::before { background: linear-gradient(135deg, #BF0000, #E60012); }
.platform-btn[data-platform="aliexpress"]::before { background: linear-gradient(135deg, #FF6A00, #FF8533); }

.platform-btn:hover::before {
    opacity: 0.08;
}

.platform-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.platform-btn span,
.platform-btn i {
    position: relative;
    z-index: 1;
}

.platform-btn.active {
    color: var(--primary-white);
    box-shadow: var(--shadow-xl);
    transform: translateY(-2px);
}

.platform-btn.active[data-platform="amazon"] { background: linear-gradient(135deg, #FF9900, #FFB84D); }
.platform-btn.active[data-platform="shopee"] { background: linear-gradient(135deg, #EE4D2D, #FF6B46); }
.platform-btn.active[data-platform="ebay"] { background: linear-gradient(135deg, #E53238, #F0484F); }
.platform-btn.active[data-platform="lazada"] { background: linear-gradient(135deg, #0F156D, #1A1F8C); }
.platform-btn.active[data-platform="qoo10"] { background: linear-gradient(135deg, #E4007F, #FF1A9E); }
.platform-btn.active[data-platform="rakuten"] { background: linear-gradient(135deg, #BF0000, #E60012); }
.platform-btn.active[data-platform="aliexpress"] { background: linear-gradient(135deg, #FF6A00, #FF8533); }

.platform-btn.active i {
    color: var(--primary-white);
}

.platform-btn.active::before {
    opacity: 0;
}

/* ===== Calculator Container ===== */
.calculator-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 40px;
}

/* ===== Middle Banner (Full Width) ===== */
.middle-banner-full {
    margin: 40px 0;
}

.banner-card-horizontal {
    background: linear-gradient(135deg, #E3F2FD, #BBDEFB);
    padding: 30px 40px;
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    border-left: 5px solid var(--primary-blue);
}

.banner-content-wrap {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 20px;
}

.banner-icon-large {
    font-size: 48px;
    flex-shrink: 0;
}

.banner-text-wrap {
    flex: 1;
}

.banner-card-horizontal h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 8px 0;
}

.banner-card-horizontal p {
    font-size: 15px;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.6;
}

.banner-features-horizontal {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
}

.banner-features-horizontal li {
    font-size: 14px;
    color: var(--text-primary);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.banner-features-horizontal i {
    color: var(--primary-green);
    font-size: 16px;
}

/* Remove old middle banner styles */
.middle-banner {
    display: none;
}

/* ===== Input Section ===== */
.input-section {
    background: var(--primary-white);
    padding: 40px;
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    border-left: 4px solid var(--primary-blue);
}

.input-section h2 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 30px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.input-section h2 i {
    color: var(--primary-blue);
    font-size: 24px;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.refresh-btn {
    background: var(--primary-blue);
    color: white;
    border: none;
    border-radius: 6px;
    padding: 4px 8px;
    cursor: pointer;
    font-size: 12px;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-left: auto;
}

.refresh-btn:hover {
    background: var(--primary-blue-dark);
    transform: scale(1.05);
}

.refresh-btn:active {
    transform: scale(0.95);
}

.refresh-btn.rotating i {
    animation: rotate 1s linear;
}

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

.live-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 11px;
    font-weight: 700;
    color: #EF4444;
    background: #FEE2E2;
    padding: 2px 8px;
    border-radius: 12px;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

.form-group input {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--border-light);
    border-radius: 12px;
    font-size: 15px;
    transition: all 0.25s ease;
    font-family: inherit;
    background: var(--primary-white);
    color: var(--text-primary);
    font-weight: 400;
}

.form-group select,
.currency-select {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--border-light);
    border-radius: 12px;
    font-size: 15px;
    transition: all 0.25s ease;
    font-family: inherit;
    background: var(--primary-white);
    color: var(--text-primary);
    font-weight: 400;
    cursor: pointer;
}

.form-group select:hover,
.currency-select:hover {
    border-color: var(--border-medium);
    background: var(--secondary-white);
}

.form-group select:focus,
.currency-select:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 4px rgba(0, 102, 255, 0.1);
    background: var(--primary-white);
}

.readonly-input {
    background: var(--secondary-white) !important;
    cursor: not-allowed;
    color: var(--text-secondary);
}

.form-group input::placeholder {
    color: var(--text-tertiary);
}

.form-group input:hover {
    border-color: var(--border-medium);
    background: var(--secondary-white);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 4px rgba(0, 102, 255, 0.1);
    background: var(--primary-white);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.help-text {
    display: block;
    margin-top: 6px;
    font-size: 12px;
    color: var(--text-tertiary);
    line-height: 1.33337;
    letter-spacing: -0.01em;
}

.platform-settings {
    background: linear-gradient(135deg, #F0F9FF, #E0F2FE);
    padding: 20px;
    border-radius: 12px;
    margin: 20px 0;
    border: 2px solid #BAE6FD;
}

.platform-settings h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.platform-settings h3 i {
    font-size: 16px;
    color: var(--primary-blue);
}

.platform-settings p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.calculate-btn {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-purple));
    color: var(--primary-white);
    border: none;
    border-radius: 12px;
    font-size: 17px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-top: 30px;
    box-shadow: var(--shadow-md);
}

.calculate-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.calculate-btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-md);
}

/* ===== Result Section ===== */
.result-section {
    background: var(--primary-white);
    padding: 40px;
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    border-left: 4px solid var(--primary-green);
}

.result-section h2 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 30px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.result-section h2 i {
    color: var(--primary-green);
    font-size: 24px;
}

.result-card {
    padding: 24px;
    background: var(--secondary-white);
    border-radius: 14px;
    margin-bottom: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 2px solid var(--border-light);
    transition: all 0.3s ease;
}

.result-card:hover {
    border-color: var(--border-medium);
    box-shadow: var(--shadow-sm);
    transform: translateY(-1px);
}

.result-card.highlight {
    background: linear-gradient(135deg, var(--primary-green), #059669);
    border: none;
    padding: 32px 24px;
    box-shadow: var(--shadow-md);
}

.result-card.highlight .result-label {
    color: rgba(255, 255, 255, 0.9);
    font-size: 15px;
}

.result-card.highlight .result-value {
    color: var(--primary-white);
}

.result-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
}

.result-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
}

.result-card.highlight .result-value {
    font-size: 40px;
    font-weight: 800;
}

.result-value.negative {
    color: var(--primary-red);
}

.result-divider {
    height: 1px;
    background: var(--border-light);
    margin: 20px 0;
}

.result-breakdown {
    margin-top: 32px;
}

.result-breakdown h3 {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.breakdown-item {
    display: flex;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid var(--tertiary-white);
    font-size: 15px;
}

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

.breakdown-item span:first-child {
    color: var(--text-secondary);
}

.breakdown-item span:last-child {
    font-weight: 600;
    color: var(--text-primary);
}

.result-summary {
    margin-top: 24px;
    padding: 20px;
    background: linear-gradient(135deg, #FEF3C7, #FDE68A);
    border-radius: 12px;
    border: 2px solid #FCD34D;
}

.summary-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    font-size: 15px;
}

.summary-row span {
    color: var(--text-secondary);
}

.summary-row strong {
    font-size: 19px;
    font-weight: 600;
    color: var(--text-primary);
}

/* ===== Result Pro CTA (Inside Result Section) ===== */
.result-pro-cta {
    margin-top: 32px;
    padding: 28px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 16px;
    color: white;
}

.result-pro-header {
    text-align: center;
    margin-bottom: 24px;
}

.result-pro-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.25);
    backdrop-filter: blur(10px);
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 12px;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.result-pro-header h3 {
    font-size: 20px;
    font-weight: 700;
    margin: 0 0 8px 0;
    line-height: 1.3;
}

.result-pro-header p {
    font-size: 14px;
    margin: 0;
    opacity: 0.95;
}

.result-pro-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-bottom: 24px;
}

.result-pro-feature {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    padding: 10px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 8px;
    backdrop-filter: blur(5px);
}

.result-pro-feature i {
    color: #10B981;
    font-size: 16px;
    flex-shrink: 0;
}

.result-pro-price {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding: 20px;
    background: white;
    border-radius: 12px;
    color: var(--text-primary);
}

.result-pro-price-left {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.result-pro-original {
    font-size: 18px;
    color: var(--text-tertiary);
    text-decoration: line-through;
}

.result-pro-current {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-primary);
}

.result-pro-discount {
    background: linear-gradient(135deg, #FF6B6B, #FF8E53);
    color: white;
    padding: 4px 12px;
    border-radius: 50px;
    font-size: 12px;
    font-weight: 700;
}

.result-pro-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, #0066FF 0%, #6366F1 100%);
    color: white;
    padding: 14px 28px;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 700;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(0, 102, 255, 0.3);
    white-space: nowrap;
}

.result-pro-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 102, 255, 0.4);
}

.result-pro-btn i {
    font-size: 17px;
}

/* ===== Info Section ===== */
.info-section {
    background: transparent;
    padding: 60px 0;
}

.info-section h2 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 40px;
    text-align: center;
    color: var(--primary-white);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.info-section h2 i {
    color: var(--primary-white);
    font-size: 28px;
}

.info-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.info-card {
    background: var(--primary-white);
    padding: 28px;
    border-radius: 16px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-md);
    border-left: 4px solid transparent;
}

.info-card:nth-child(1) { border-left-color: #FF9900; }
.info-card:nth-child(2) { border-left-color: #EE4D2D; }
.info-card:nth-child(3) { border-left-color: #E53238; }
.info-card:nth-child(4) { border-left-color: #0F156D; }
.info-card:nth-child(5) { border-left-color: #E4007F; }

.info-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.info-card h3 {
    font-size: 19px;
    font-weight: 700;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-primary);
}

.info-card:nth-child(1) h3 i { color: #FF9900; }
.info-card:nth-child(2) h3 i { color: #EE4D2D; }
.info-card:nth-child(3) h3 i { color: #E53238; }
.info-card:nth-child(4) h3 i { color: #0F156D; }
.info-card:nth-child(5) h3 i { color: #E4007F; }

.info-card ul {
    list-style: none;
}

.info-card li {
    padding: 6px 0;
    font-size: 14px;
    color: var(--text-secondary);
    position: relative;
    padding-left: 16px;
    line-height: 1.42859;
}

.info-card li:before {
    content: "·";
    position: absolute;
    left: 0;
    color: var(--text-tertiary);
    font-size: 18px;
    font-weight: bold;
}

/* ===== Footer ===== */
.footer {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 30px 0;
    text-align: center;
    color: var(--text-secondary);
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.08);
}

.footer p {
    margin: 8px 0;
    font-size: 12px;
    line-height: 1.33337;
    letter-spacing: -0.01em;
}

.footer-note {
    font-size: 11px;
    color: var(--text-tertiary);
    margin-top: 12px;
}

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

@keyframes popupFadeIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.result-card {
    animation: fadeInUp 0.4s ease forwards;
}

/* ===== Premium Popup ===== */
.premium-popup {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(8px);
    z-index: 10000;
    align-items: center;
    justify-content: center;
    padding: 20px;
    animation: fadeIn 0.3s ease;
}

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

.premium-popup-content {
    background: linear-gradient(135deg, #ffffff 0%, #f8f9ff 100%);
    border-radius: 24px;
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    padding: 48px 40px;
    position: relative;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: popupFadeIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.premium-popup-close {
    position: absolute;
    top: 20px;
    right: 20px;
    background: rgba(0, 0, 0, 0.1);
    border: none;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    font-size: 24px;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    z-index: 1;
}

.premium-popup-close:hover {
    background: rgba(0, 0, 0, 0.2);
    transform: rotate(90deg);
}

.premium-popup-header {
    text-align: center;
    margin-bottom: 40px;
}

.premium-crown {
    font-size: 48px;
    color: #0066FF;
    margin-bottom: 16px;
    display: block;
    animation: pulse 2s infinite;
}

.premium-popup-header h2 {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 12px 0;
    line-height: 1.2;
}

.premium-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    margin: 0;
}

.premium-features {
    margin-bottom: 36px;
}

.premium-feature-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 16px;
    background: white;
    border-radius: 12px;
    margin-bottom: 12px;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.premium-feature-item:hover {
    border-color: #0066FF;
    transform: translateX(8px);
    box-shadow: 0 4px 12px rgba(0, 102, 255, 0.1);
}

.premium-feature-item i {
    color: #10B981;
    font-size: 24px;
    flex-shrink: 0;
    margin-top: 2px;
}

.premium-feature-item h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 4px 0;
}

.premium-feature-item p {
    font-size: 14px;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.5;
}

.premium-pricing {
    text-align: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 24px;
    border-radius: 16px;
    margin-bottom: 28px;
    color: white;
}

.premium-price-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 8px;
    flex-wrap: wrap;
}

.premium-price-original {
    font-size: 24px;
    text-decoration: line-through;
    opacity: 0.7;
}

.premium-price-current {
    font-size: 48px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.premium-discount-label {
    font-size: 14px;
    font-weight: 500;
    margin: 0;
    opacity: 0.95;
}

.premium-buttons {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 20px;
}

.premium-btn-primary,
.premium-btn-secondary {
    padding: 16px 32px;
    border-radius: 12px;
    font-size: 17px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    text-decoration: none;
}

.premium-btn-primary {
    background: linear-gradient(135deg, #0066FF 0%, #6366F1 100%);
    color: white;
    box-shadow: 0 4px 16px rgba(0, 102, 255, 0.3);
}

.premium-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 102, 255, 0.4);
}

.premium-btn-primary i {
    font-size: 18px;
}

.premium-btn-secondary {
    background: white;
    color: var(--text-secondary);
    border: 2px solid var(--border-medium);
}

.premium-btn-secondary:hover {
    background: var(--background-secondary);
    border-color: var(--border-dark);
}

.premium-guarantee {
    text-align: center;
    font-size: 13px;
    color: var(--text-secondary);
    margin: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.premium-guarantee i {
    color: #10B981;
    font-size: 14px;
}

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
    .calculator-container {
        grid-template-columns: 1fr;
    }
    
    .platform-buttons {
        justify-content: flex-start;
    }

    .banner-content-wrap {
        flex-direction: column;
        text-align: center;
    }

    .banner-features-horizontal {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }

    .top-banner {
        padding: 10px 0;
    }

    .banner-content {
        flex-direction: column;
        gap: 8px;
    }

    .banner-text {
        font-size: 13px;
        padding: 0 30px;
    }

    .banner-close {
        top: 5px;
        right: 5px;
    }

    .platform-buttons {
        gap: 8px;
    }

    .platform-btn {
        padding: 16px 12px;
        font-size: 12px;
        min-width: 85px;
    }

    .platform-btn i {
        font-size: 24px;
    }

    .banner-card-horizontal {
        padding: 20px;
    }

    .banner-content-wrap {
        flex-direction: column;
        text-align: center;
        gap: 15px;
    }
    
    /* Premium Popup Mobile Styles */
    .premium-popup {
        padding: 10px;
    }
    
    .premium-popup-content {
        padding: 32px 24px;
        border-radius: 20px;
        max-height: 85vh;
    }
    
    .premium-popup-close {
        width: 32px;
        height: 32px;
        font-size: 20px;
        top: 12px;
        right: 12px;
    }
    
    .premium-crown {
        font-size: 40px;
    }
    
    .premium-popup-header h2 {
        font-size: 24px;
    }
    
    .premium-subtitle {
        font-size: 14px;
    }
    
    .premium-feature-item {
        padding: 12px;
        gap: 12px;
    }
    
    .premium-feature-item i {
        font-size: 20px;
    }
    
    .premium-feature-item h3 {
        font-size: 15px;
    }
    
    .premium-feature-item p {
        font-size: 13px;
    }
    
    .premium-pricing {
        padding: 20px 16px;
    }
    
    .premium-price-current {
        font-size: 36px;
    }
    
    .premium-price-original {
        font-size: 18px;
    }
    
    .premium-price-period {
        font-size: 16px;
    }
    
    .premium-discount-label {
        font-size: 13px;
    }
    
    .premium-btn-primary,
    .premium-btn-secondary {
        padding: 14px 24px;
        font-size: 16px;
    }
    
    .premium-guarantee {
        font-size: 12px;
    }
    
    /* Result Pro CTA - Mobile */
    .result-pro-cta {
        padding: 20px;
    }
    
    .result-pro-header h3 {
        font-size: 18px;
    }
    
    .result-pro-features {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .result-pro-price {
        flex-direction: column;
        align-items: stretch;
        gap: 16px;
        padding: 16px;
    }
    
    .result-pro-price-left {
        justify-content: center;
        text-align: center;
    }
    
    .result-pro-current {
        font-size: 28px;
    }
    
    .result-pro-btn {
        width: 100%;
        justify-content: center;
        font-size: 15px;
        padding: 12px 24px;
    }
    
    /* Result Pro CTA - Mobile */
    .result-pro-cta {
        padding: 20px;
    }
    
    .result-pro-header h3 {
        font-size: 18px;
    }
    
    .result-pro-features {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .result-pro-price {
        flex-direction: column;
        align-items: stretch;
        gap: 16px;
        padding: 16px;
    }
    
    .result-pro-price-left {
        justify-content: center;
        text-align: center;
    }
    
    .result-pro-current {
        font-size: 28px;
    }
    
    .result-pro-btn {
        width: 100%;
        justify-content: center;
        font-size: 15px;
        padding: 12px 24px;
    }

    .banner-card-horizontal h3 {
        font-size: 18px;
    }

    .banner-card-horizontal p {
        font-size: 14px;
    }

    .banner-features-horizontal {
        flex-direction: column;
        gap: 12px;
        align-items: center;
    }

    .header {
        padding: 25px 0 20px 0;
    }
    
    .logo h1 {
        font-size: 28px;
    }
    
    .logo i {
        font-size: 26px;
    }

    .subtitle {
        font-size: 15px;
    }

    .header-description {
        font-size: 13px;
    }
    
    .platform-section h2,
    .info-section h2 {
        font-size: 24px;
    }
    
    .platform-buttons {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }

    .platform-btn {
        padding: 20px 12px;
        font-size: 13px;
    }

    .platform-btn i {
        font-size: 24px;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .input-section,
    .result-section {
        padding: 28px 20px;
    }

    .input-section h2,
    .result-section h2 {
        font-size: 22px;
    }
    
    .result-value {
        font-size: 24px;
    }
    
    .result-card.highlight .result-value {
        font-size: 32px;
    }
    
    .info-cards {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .platform-buttons {
        grid-template-columns: 1fr;
    }

    .platform-btn {
        padding: 16px;
    }
}

/* ===== Smooth Scrolling ===== */
html {
    scroll-behavior: smooth;
}

/* ===== Selection Color ===== */
::selection {
    background: var(--primary-black);
    color: var(--primary-white);
}

::-moz-selection {
    background: var(--primary-black);
    color: var(--primary-white);
}