:root {
    --brand-dark: #090D16;
    --brand-primary: #0F172A;
    --brand-primary-hover: #1E293B;
    --sol-teal: #14F195;
    --sol-purple: #9945FF;
    
    /* Tether 官方规范色彩参数 */
    --usdt-aqua: #009393;
    --usdt-aqua-soft: #E6F5F5;
    --usdt-aqua-border: #92DBD1;
    --usdt-aqua-hover: #007D7D;
    
    --gate-blue: #2563EB;
    --gate-blue-hover: #1D4ED8;
    
    --bg-canvas: #F8FAFC;
    --surface-card: #FFFFFF;
    --surface-subtle: #F8FAFC;
    --surface-hover: #F1F5F9;
    
    --text-heading: #0F172A;
    --text-body: #334155;
    --text-caption: #64748B;
    --border-subtle: #E2E8F0;
    --border-focus: #009393;
    
    /* 精细微圆角参数 */
    --radius-card: 12px;
    --radius-btn: 8px;
    --radius-pill: 999px;
    
    --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.05), 0 1px 2px rgba(15, 23, 42, 0.03);
    --shadow-card: 0 16px 36px -10px rgba(15, 23, 42, 0.08), 0 0 0 1px rgba(226, 232, 240, 0.9);
    --shadow-modal: 0 25px 60px -15px rgba(15, 23, 42, 0.35), 0 0 0 1px rgba(0, 0, 0, 0.08);
    
    --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Hiragino Sans GB", "Segoe UI", Roboto, sans-serif;
    --font-mono: "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }

body {
    background-color: var(--bg-canvas);
    background-image: 
        radial-gradient(at 15% 10%, rgba(0, 147, 147, 0.08) 0px, transparent 45%),
        radial-gradient(at 85% 10%, rgba(153, 69, 255, 0.06) 0px, transparent 45%),
        radial-gradient(at 50% 100%, rgba(37, 99, 235, 0.04) 0px, transparent 60%);
    font-family: var(--font-sans);
    color: var(--text-heading);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: 44px 20px 70px;
    -webkit-font-smoothing: antialiased;
}

/* 品牌 Logo 导航链接微动效 */
a.brand-badge {
    text-decoration: none;
    cursor: pointer;
    user-select: none;
    transition: opacity 0.2s cubic-bezier(0.4, 0, 0.2, 1), transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-flex;
    align-items: center;
    gap: 12px;
}

a.brand-badge:hover {
    opacity: 0.88;
    transform: translateY(-1px);
}

a.brand-badge:hover .brand-icon {
    transform: scale(1.05);
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

a.brand-badge:active {
    transform: translateY(0) scale(0.98);
}

.gateway-wrapper {
    width: 100%;
    max-width: 550px;
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.glass-panel {
    background: var(--surface-card);
    border-radius: var(--radius-card);
    box-shadow: var(--shadow-card);
    border: 1px solid var(--border-subtle);
    overflow: hidden;
}

/* 顶部导航：长标题自适应，右侧防挤压折行 */
.panel-header {
    padding: 24px 28px;
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    background: #FFFFFF;
}

.brand-badge { 
    display: flex; 
    align-items: center; 
    gap: 14px; 
    min-width: 0;
    flex: 1;
}

.brand-icon {
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background: #009393;
    box-shadow: 0 4px 12px rgba(0, 147, 147, 0.35);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    user-select: none;
}

.brand-icon span {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    color: #FFFFFF;
    font-size: 26px;
    font-weight: 800;
    line-height: 1;
    margin-top: -2px;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

.brand-text {
    min-width: 0;
}

.brand-text h1 { 
    font-size: 17px; 
    font-weight: 700; 
    letter-spacing: -0.01em; 
    color: var(--text-heading);
    line-height: 1.3;
    word-break: break-word;
}

.header-right-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
    flex-wrap: nowrap;
}

.network-pill {
    display: flex; 
    align-items: center; 
    gap: 7px;
    background: #F8FAFC;
    padding: 6px 12px; 
    border-radius: var(--radius-pill);
    font-size: 12px; 
    font-weight: 600; 
    color: var(--text-body);
    border: 1px solid var(--border-subtle);
    flex-shrink: 0;
    white-space: nowrap;
}

.sol-dot {
    width: 8px; 
    height: 8px; 
    border-radius: 50%;
    background: var(--usdt-aqua);
    box-shadow: 0 0 8px rgba(0, 147, 147, 0.7);
    flex-shrink: 0;
}

.lang-selector-box {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.lang-select {
    appearance: none;
    -webkit-appearance: none;
    background: #F8FAFC url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2364748B' viewBox='0 0 16 16'%3E%3Cpath d='M7.247 11.14L2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z'/%3E%3C/svg%3E") no-repeat right 8px center;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-pill);
    padding: 6px 24px 6px 10px;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-body);
    cursor: pointer;
    outline: none;
    transition: all 0.2s;
    white-space: nowrap;
}

.lang-select:hover {
    border-color: #CBD5E1;
    background-color: #F1F5F9;
}

.panel-body { 
    padding: 28px 32px 32px; 
    display: flex; 
    flex-direction: column; 
    gap: 18px;
}

.search-container {
    position: relative;
    display: flex;
    align-items: center;
    background: #FFFFFF;
    border: 1.5px solid var(--border-subtle);
    border-radius: var(--radius-btn);
    padding: 4px 6px;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
}

.search-container:focus-within {
    border-color: var(--gate-blue);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.search-input {
    flex: 1;
    min-width: 0;
    padding: 11px 14px;
    font-size: 14px;
    font-family: var(--font-mono);
    border: none;
    outline: none;
    color: var(--text-heading);
    background: transparent;
}

.search-input::placeholder {
    font-family: var(--font-sans);
    font-size: 13.5px;
    color: #94A3B8;
}

.btn-search {
    background: var(--gate-blue);
    color: #FFFFFF;
    font-size: 13.5px;
    font-weight: 600;
    border: none;
    padding: 10px 22px;
    border-radius: var(--radius-btn);
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    white-space: nowrap;
    flex-shrink: 0;
}

.btn-search:hover { background: var(--gate-blue-hover); }

.checkout-loader {
    display: flex; flex-direction: column; align-items: center;
    justify-content: center; padding: 40px 20px; gap: 14px;
}

.spinner {
    width: 40px; height: 40px; border: 3px solid #E2E8F0;
    border-top: 3px solid var(--usdt-aqua); border-radius: 50%;
    animation: spin 0.8s cubic-bezier(0.5, 0.1, 0.5, 0.9) infinite;
}

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

.loader-title { font-size: 15px; font-weight: 600; color: var(--text-heading); }
.loader-desc { font-size: 13px; color: var(--text-caption); }

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.65);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-container {
    background: #FFFFFF;
    width: 100%;
    max-width: 540px;
    border-radius: var(--radius-card);
    box-shadow: var(--shadow-modal);
    border: 1px solid var(--border-subtle);
    position: relative;
    overflow: hidden;
    transform: translateY(8px);
    transition: transform 0.2s ease;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
}

.modal-overlay.active .modal-container {
    transform: translateY(0);
}

.modal-header {
    padding: 18px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-subtle);
    background: #FAFCFE;
    position: relative;
}

.modal-header::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; height: 3px;
    background: var(--usdt-aqua);
}

.modal-title-group {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 16px;
    font-weight: 700;
    color: var(--text-heading);
}

.modal-title-group svg {
    width: 20px; height: 20px; color: var(--usdt-aqua);
}

.btn-modal-close {
    background: #F1F5F9;
    border: 1px solid var(--border-subtle);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-caption);
    font-size: 16px;
    font-weight: 700;
    transition: all 0.2s;
    outline: none;
}

.btn-modal-close:hover {
    background: #E2E8F0;
    color: var(--text-heading);
}

.modal-body {
    padding: 22px 24px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.result-badge-paid {
    background: var(--usdt-aqua-soft);
    color: var(--usdt-aqua);
    border: 1px solid var(--usdt-aqua-border);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.06em;
    padding: 3px 9px;
    border-radius: var(--radius-pill);
}

.result-items-list { display: flex; flex-direction: column; gap: 10px; }

.result-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 14px;
    padding: 11px 16px;
    background: var(--surface-subtle);
    border-radius: var(--radius-btn);
    border: 1px solid #F1F5F9;
}

.result-k { color: var(--text-caption); font-weight: 500; font-size: 13.5px; white-space: nowrap; flex-shrink: 0; }
.result-v { font-size: 14px; color: var(--text-heading); font-weight: 600; text-align: right; word-break: break-all; }
.result-v.mono { 
    font-family: var(--font-mono); 
    font-size: 13px; 
    line-height: 1.4;
}

.result-v-hash {
    font-family: var(--font-mono);
    font-size: 12.5px;
    line-height: 1.5;
    color: var(--text-heading);
    text-align: left;
    word-break: break-all;
    background: #FFFFFF;
    padding: 7px 11px;
    border-radius: var(--radius-btn);
    border: 1px solid var(--border-subtle);
    cursor: pointer;
    transition: all 0.15s;
    max-width: 100%;
}

.result-v-hash:hover {
    border-color: var(--usdt-aqua);
    background: #F8FAFC;
}

.btn-copy-all {
    background: var(--brand-primary);
    color: #FFFFFF;
    border: none;
    font-size: 14px;
    font-weight: 600;
    padding: 13px 18px;
    border-radius: var(--radius-btn);
    cursor: pointer;
    display: flex; align-items: center; justify-content: center; gap: 8px;
    transition: all 0.2s ease;
    margin-top: 4px;
}

.btn-copy-all:hover { background: var(--brand-primary-hover); }

.order-product-card {
    background: #FFFFFF;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-btn);
    padding: 12px 18px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.order-product-title { font-size: 14px; font-weight: 600; color: var(--text-heading); }
.order-auto-tag {
    background: var(--usdt-aqua-soft); color: var(--usdt-aqua); font-size: 11.5px; font-weight: 600;
    padding: 3px 9px; border-radius: var(--radius-pill);
}

.custom-amount-card {
    background: var(--surface-subtle);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-card);
    padding: 18px 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.custom-input-label { font-size: 13.5px; font-weight: 600; color: var(--text-body); }
.custom-input-row { display: flex; gap: 10px; }

.input-price {
    flex: 1; min-width: 0; padding: 11px 14px; font-size: 17px; font-family: var(--font-mono);
    font-weight: 600; border: 1.5px solid var(--border-subtle); border-radius: var(--radius-btn);
    outline: none; background: #FFFFFF; transition: all 0.2s;
}

.input-price:focus { border-color: var(--gate-blue); box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1); }

.btn-confirm-amount {
    border: none; background: var(--brand-primary); color: #FFFFFF; font-size: 13.5px;
    font-weight: 600; padding: 0 20px; border-radius: var(--radius-btn); cursor: pointer; transition: all 0.2s;
    white-space: nowrap; flex-shrink: 0;
}

.btn-confirm-amount:hover { background: var(--brand-primary-hover); }

/* 金额展示区域：Flex居中 + 底部基线对齐 + 大字号 */
.amount-hero {
    background: #FFFFFF;
    border: 1.5px dashed #CBD5E1;
    border-radius: var(--radius-card);
    padding: 24px 20px;
    text-align: center;
    cursor: pointer;
    position: relative;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.amount-hero:hover {
    border-color: var(--usdt-aqua);
    background: #FAFCFC;
}

.amount-title {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-caption);
    letter-spacing: 0.04em;
}

.amount-title svg {
    width: 14px;
    height: 14px;
    color: var(--text-caption);
}

.amount-val-group {
    display: inline-flex;
    align-items: baseline;
    justify-content: center;
    gap: 8px;
    line-height: 1;
}

.amount-number {
    font-size: 56px;
    font-weight: 800;
    font-family: var(--font-mono);
    color: var(--text-heading);
    letter-spacing: -0.04em;
    line-height: 1;
}

.amount-tag {
    font-size: 14px;
    font-weight: 700;
    font-family: var(--font-sans);
    color: var(--usdt-aqua);
    background: var(--usdt-aqua-soft);
    border: 1px solid var(--usdt-aqua-border);
    padding: 3px 8px;
    border-radius: 6px;
    line-height: 1.2;
    transform: translateY(-4px);
}

.network-alert {
    background: #FFFBEB;
    border: 1px solid #FDE68A;
    padding: 12px 16px;
    border-radius: var(--radius-btn);
    font-size: 13px;
    color: #92400E;
    line-height: 1.5;
    letter-spacing: 0.2px;
    word-break: break-word;
}

.qr-section {
    display: flex; flex-direction: column; align-items: center; gap: 12px;
    background: #F8FAFC; border: 1px solid var(--border-subtle);
    padding: 22px 20px; border-radius: var(--radius-card);
}

.qr-box {
    background: #FFFFFF; padding: 12px; border-radius: var(--radius-btn);
    border: 1px solid var(--border-subtle); box-shadow: var(--shadow-sm);
    display: flex; align-items: center; justify-content: center;
}

.qr-box img { width: 175px; height: 175px; display: block; max-width: 100%; height: auto; }
.qr-desc { font-size: 13px; color: var(--text-caption); font-weight: 500; text-align: center; }

.address-box { display: flex; flex-direction: column; gap: 8px; }

.address-card {
    background: #FFFFFF; border: 1px solid var(--border-subtle); border-radius: var(--radius-btn);
    padding: 11px 16px; display: flex; align-items: center; justify-content: space-between; gap: 14px;
    cursor: pointer; transition: all 0.2s;
}

.address-card:hover { border-color: #94A3B8; background: var(--surface-subtle); }

.address-text {
    font-family: var(--font-mono); font-size: 12.5px; word-break: break-all;
    font-weight: 500; line-height: 1.4; color: var(--text-body);
    min-width: 0;
}

.btn-copy {
    background: var(--surface-subtle); border: 1px solid var(--border-subtle);
    font-size: 12px; font-weight: 600; padding: 6px 12px; border-radius: var(--radius-btn);
    white-space: nowrap; cursor: pointer; color: var(--text-heading);
    transition: all 0.15s;
    flex-shrink: 0;
}

.btn-copy:hover { background: #FFFFFF; border-color: #CBD5E1; }

/* 状态同步模块：文本居中 + 底部全宽流动光条 */
.status-sync-box {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #F1F5F9;
    border-radius: var(--radius-btn);
    padding: 14px 20px 16px; /* 底部稍微预留空间给光条 */
    overflow: hidden;        /* 保证底部光条与外框微圆角完美契合 */
}

/* 隐藏原本的小球结构（无需修改 HTML） */
.pulse-dot-wrap {
    display: none !important;
}

/* 文字块：无论单行多行，绝对水平居中对齐 */
#sync-text {
    width: 100%;
    font-size: 13.5px;
    line-height: 1.5;
    color: var(--text-caption);
    font-weight: 600;
    text-align: center;
    word-break: normal;
    overflow-wrap: break-word;
}

/* 底部发光动态流动条（采用科技感翡翠绿到深蓝渐变平滑流动） */
.status-sync-box::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(
        90deg, 
        transparent 0%, 
        var(--usdt-aqua) 25%, 
        var(--gate-blue) 50%, 
        var(--sol-teal) 75%, 
        transparent 100%
    );
    background-size: 200% 100%;
    animation: streamBar 2.2s linear infinite;
    opacity: 0.85;
}

@keyframes streamBar {
    0% {
        background-position: 100% 0;
    }
    100% {
        background-position: -100% 0;
    }
}

.gateway-footer {
    text-align: center;
    font-size: 12.5px;
    color: var(--text-caption);
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 6px;
}

.gateway-footer a { color: var(--text-body); text-decoration: none; font-weight: 500; }
.gateway-footer a:hover { color: var(--gate-blue); }

.toast {
    position: fixed; top: 24px; left: 50%; transform: translateX(-50%) translateY(-30px);
    background: rgba(15, 23, 42, 0.92); backdrop-filter: blur(8px); color: #FFFFFF;
    padding: 10px 24px; font-size: 13.5px; font-weight: 500; border-radius: var(--radius-pill);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15); opacity: 0; pointer-events: none;
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1); z-index: 99999;
}

.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

.hidden { display: none !important; }

/* 移动端与极端窄屏自适应响应式规则 */
@media (max-width: 640px) {
    body {
        padding: 16px 12px 36px;
    }

    .gateway-wrapper {
        gap: 20px;
    }

    .panel-header {
        padding: 16px 18px;
        flex-direction: column;
        align-items: flex-start;
        gap: 14px;
    }

    .header-right-actions {
        width: 100%;
        justify-content: space-between;
    }

    .panel-body {
        padding: 18px 16px 22px;
        gap: 15px;
    }

    /* 搜索栏：窄屏下换行并铺满 */
    .search-container {
        flex-wrap: wrap;
        padding: 4px;
        gap: 6px;
    }

    .search-input {
        min-width: 100%;
        padding: 10px 12px;
        font-size: 13px;
    }

    .btn-search {
        width: 100%;
        padding: 10px 0;
        text-align: center;
    }

    .amount-hero {
        padding: 20px 14px;
    }

    .amount-number {
        font-size: 42px;
    }

    /* 地址卡片：窄屏下模仿订单查询栏，按钮独占一行并铺满居中 */
    .address-card {
        flex-direction: column;
        align-items: stretch;
        padding: 12px 14px;
        gap: 10px;
    }

    .address-text {
        width: 100%;
        font-size: 12.5px;
        line-height: 1.4;
    }

    .btn-copy {
        width: 100%;
        padding: 9px 0;
        text-align: center;
        margin-left: 0;
    }

    .custom-input-row {
        flex-direction: column;
    }

    .btn-confirm-amount {
        padding: 11px 0;
        width: 100%;
    }

    .modal-container {
        max-height: 85vh;
    }

    .modal-body {
        padding: 16px;
    }

    .result-row {
        padding: 9px 12px;
    }
}