/* ===== 基础变量 ===== */
:root {
    /* 灰色主调 */
    --gray-50: #f7f8fa;
    --gray-100: #f2f3f5;
    --gray-200: #e5e6eb;
    --gray-300: #c9cdd4;
    --gray-400: #a9aeb8;
    --gray-500: #86909c;
    --gray-600: #6b7280;
    --gray-700: #4e5969;
    --gray-800: #2c2f36;
    --gray-900: #1d2026;

    /* 红色点缀 */
    --red-50: #ffece8;
    --red-100: #fed4ca;
    --red-400: #f76560;
    --red-500: #f53f3f;
    --red-600: #e63838;
    --red-700: #c92a2a;

    /* 功能色 */
    --green-500: #00b42a;
    --green-50: #e8ffea;

    --radius-sm: 6px;
    --radius: 8px;
    --radius-lg: 12px;
    --radius-xl: 18px;

    --shadow-sm: 0 1px 4px rgba(29, 32, 38, 0.06);
    --shadow: 0 4px 18px rgba(29, 32, 38, 0.08);
    --shadow-lg: 0 12px 40px rgba(29, 32, 38, 0.12);
    --shadow-red: 0 8px 24px rgba(245, 63, 63, 0.28);

    --container: 1200px;
    --header-h: 66px;
}

/* ===== Reset ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 12px); }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", Roboto, Helvetica, Arial, sans-serif;
    color: var(--gray-700);
    background: #fff;
    line-height: 1.6;
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; transition: color .2s ease; }
img { display: block; max-width: 100%; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input { font-family: inherit; }
ul { list-style: none; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.container-narrow { max-width: 820px; }

/* ===== 滚动条 ===== */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--gray-400), var(--gray-500));
    border-radius: 4px;
    border: 2px solid transparent;
    background-clip: content-box;
}
::-webkit-scrollbar-thumb:hover { background: linear-gradient(180deg, var(--red-500), var(--red-600)); background-clip: content-box; }
::-webkit-scrollbar-thumb:active { background: linear-gradient(180deg, var(--red-600), var(--red-700)); background-clip: content-box; }
* { scrollbar-width: thin; scrollbar-color: var(--gray-400) transparent; }

/* ===== 选区 ===== */
::selection { background: var(--red-500); color: #fff; }

/* ===== 通用按钮 ===== */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    height: 44px; padding: 0 24px;
    border-radius: var(--radius);
    font-size: 15px; font-weight: 600; line-height: 1;
    cursor: pointer;
    transition: all .25s ease;
    white-space: nowrap;
}
.btn-primary {
    background: var(--red-500); color: #fff;
    box-shadow: var(--shadow-red);
}
.btn-primary:hover { background: var(--red-600); color: #fff; transform: translateY(-1px); box-shadow: 0 10px 28px rgba(230, 56, 56, 0.36); }
.btn-primary:active { background: var(--red-700); color: #fff; transform: translateY(0); }

.btn-promo {
    background: var(--red-500); color: #fff; height: 50px; padding: 0 30px;
    box-shadow: var(--shadow-red);
}
.btn-promo:hover { background: var(--red-600); color: #fff; transform: translateY(-2px); }

.btn-light {
    background: #fff; color: var(--red-600); height: 50px; padding: 0 34px;
    box-shadow: var(--shadow-lg);
}
.btn-light:hover { background: var(--red-500); color: #fff; transform: translateY(-2px); }

/* 按钮加载中动画 */
.btn-loading {
    display: inline-block; width: 16px; height: 16px;
    border: 2px solid rgba(255,255,255,0.4); border-top-color: #fff;
    border-radius: 50%; animation: btnSpin .7s linear infinite;
}
@keyframes btnSpin { to { transform: rotate(360deg); } }

/* ===== 顶部公告条 ===== */
.topbar {
    background: var(--gray-900); color: rgba(255,255,255,0.78);
    font-size: 13px; height: 36px;
    display: flex; align-items: center;
}
.topbar-inner { display: flex; align-items: center; justify-content: space-between; width: 100%; }
.topbar-text { letter-spacing: .3px; }
.topbar-link {
    display: inline-flex; align-items: center; gap: 8px;
    color: rgba(255,255,255,0.85);
}
.topbar-link .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--red-500); box-shadow: 0 0 8px var(--red-500); }
.topbar-link:hover { color: #fff; }

/* ===== 导航 ===== */
.header {
    position: sticky; top: 0; z-index: 100;
    background: rgba(255,255,255,0.92);
    backdrop-filter: saturate(180%) blur(12px);
    -webkit-backdrop-filter: saturate(180%) blur(12px);
    border-bottom: 1px solid var(--gray-200);
    transition: box-shadow .25s ease, background .25s ease;
}
.header.scrolled { box-shadow: var(--shadow-sm); background: rgba(255,255,255,0.96); }
.nav { display: flex; align-items: center; justify-content: space-between; height: var(--header-h); }

.brand { display: flex; align-items: center; gap: 10px; }
.brand-logo { width: 38px; height: 38px; border-radius: 10px; box-shadow: var(--shadow-sm); object-fit: cover; }
.brand-name { font-size: 20px; font-weight: 800; color: var(--gray-900); letter-spacing: .5px; }
.brand-sub {
    font-size: 12px; color: var(--gray-500); font-weight: 600;
    padding: 3px 8px; background: var(--gray-100); border-radius: 20px;
    margin-left: 2px;
}

.nav-menu { display: flex; align-items: center; gap: 4px; }
.nav-link {
    padding: 8px 16px; border-radius: var(--radius);
    font-size: 15px; font-weight: 600; color: var(--gray-700);
    transition: all .2s ease;
}
.nav-link:hover { color: var(--red-600); background: var(--red-50); }
.nav-link-accent {
    color: var(--red-600) !important;
    border: 1px solid var(--red-100);
    margin-left: 6px;
}
.nav-link-accent:hover { background: var(--red-500) !important; color: #fff !important; border-color: var(--red-500); }

.nav-toggle {
    display: none; flex-direction: column; gap: 5px;
    padding: 8px; border-radius: var(--radius);
}
.nav-toggle span { width: 22px; height: 2px; background: var(--gray-800); border-radius: 2px; transition: all .25s ease; }
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Hero ===== */
.hero { position: relative; padding: 64px 0 80px; overflow: hidden; }
.hero-bg {
    position: absolute; inset: 0; z-index: 0;
    background:
        radial-gradient(circle at 85% 15%, rgba(245, 63, 63, 0.08), transparent 45%),
        radial-gradient(circle at 10% 90%, rgba(134, 144, 156, 0.10), transparent 40%),
        linear-gradient(180deg, #fbfcfd 0%, #fff 60%);
}
.hero-bg::before {
    content: ""; position: absolute; inset: 0;
    background-image:
        linear-gradient(rgba(201,205,212,0.18) 1px, transparent 1px),
        linear-gradient(90deg, rgba(201,205,212,0.18) 1px, transparent 1px);
    background-size: 44px 44px;
    -webkit-mask-image: radial-gradient(ellipse at 50% 30%, #000 30%, transparent 75%);
    mask-image: radial-gradient(ellipse at 50% 30%, #000 30%, transparent 75%);
}
.hero-inner { position: relative; z-index: 1; display: grid; grid-template-columns: 1.15fr 1fr; gap: 56px; align-items: center; }

.badge {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 6px 14px; border-radius: 30px;
    background: #fff; border: 1px solid var(--gray-200);
    box-shadow: var(--shadow-sm);
    font-size: 13px; font-weight: 600; color: var(--gray-600);
}
.badge-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--green-500); box-shadow: 0 0 0 4px rgba(0,180,42,0.15); }

.hero-title {
    margin-top: 18px;
    font-size: 46px; font-weight: 800; line-height: 1.15;
    color: var(--gray-900); letter-spacing: -.5px;
}
.text-accent { color: var(--red-500); position: relative; }
.hero-desc { margin-top: 18px; font-size: 16.5px; color: var(--gray-600); line-height: 1.75; }

/* 查询工具 */
.tool { margin-top: 30px; }
.tool-card {
    background: #fff; border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    padding: 22px;
    box-shadow: var(--shadow-lg);
    position: relative;
}
.tool-card::before {
    content: ""; position: absolute; top: -1px; left: 24px; right: 24px; height: 3px;
    background: linear-gradient(90deg, var(--red-500), var(--red-400));
    border-radius: 0 0 3px 3px;
}
.tool-row { display: flex; gap: 12px; }
.input-wrap {
    position: relative; flex: 1; display: flex; align-items: center;
}
.input-icon {
    position: absolute; left: 14px; top: 50%; transform: translateY(-50%);
    color: var(--gray-400); pointer-events: none; display: flex;
    transition: color .25s ease;
}
.tool-input {
    width: 100%; height: 44px;
    padding: 0 44px 0 42px;
    border: 1.5px solid var(--gray-300);
    border-radius: var(--radius);
    background: #fff; color: var(--gray-900);
    font-size: 16px; font-weight: 600; letter-spacing: 1.5px;
    transition: all .25s ease; outline: none;
}
.tool-input::placeholder { color: var(--gray-400); font-weight: 500; letter-spacing: normal; }
.tool-input:hover { border-color: var(--gray-400); }
.tool-input:focus {
    border-color: var(--red-500);
    box-shadow: 0 0 0 4px rgba(245, 63, 63, 0.12);
}
.input-wrap:focus-within .input-icon { color: var(--red-500); }

.clear-btn {
    position: absolute; right: 10px; top: 50%; transform: translateY(-50%);
    width: 22px; height: 22px; border-radius: 50%;
    background: var(--gray-200); color: var(--gray-500);
    font-size: 16px; line-height: 1;
    display: none; align-items: center; justify-content: center;
    transition: all .2s ease;
}
.clear-btn:hover { background: var(--red-500); color: #fff; }
.clear-btn.show { display: flex; }

.tool-hint {
    margin-top: 12px; font-size: 13px; color: var(--gray-500);
    display: flex; align-items: center; gap: 8px;
}
.tool-hint-sep { color: var(--gray-300); }
.hint-dot {
    width: 6px; height: 6px; border-radius: 50%; background: var(--red-500);
    flex: 0 0 6px;
}

/* ===== 查询表单 v2（三行布局：号段行 / 地区行 / 按钮行 · 两端严格对齐） ===== */
.tool-row-v2 {
    display: grid;
    /* 统一用 6 列栅格：每行都占满 6 列 → 三行左右两端严格对齐 */
    grid-template-columns: repeat(6, 1fr);
    grid-template-rows: auto auto auto;
    row-gap: 14px;
    column-gap: 14px;
    align-items: stretch;
}

/* 第 1 行：前3位(2列) | 星号(2列居中) | 后4位(2列) → 合计 6 列，与第 2 行两端对齐 */
.part-prefix    { grid-column: 1 / 3; grid-row: 1; }
.part-asterisk  { grid-column: 3 / 5; grid-row: 1; }
.part-suffix    { grid-column: 5 / 7; grid-row: 1; }

/* 第 2 行：省区(3列) | 城市(3列) → 合计 6 列 */
.part-province  { grid-column: 1 / 4; grid-row: 2; }
.part-city      { grid-column: 4 / 7; grid-row: 2; }

/* 第 3 行：查询按钮（跨满 6 列居中） */
.btn-query      { grid-column: 1 / 7; grid-row: 3; }

.part {
    display: flex;
    flex-direction: column;
    gap: 6px;
    min-width: 0;
}
.part-label {
    font-size: 12px; font-weight: 600; color: var(--gray-500);
    padding-left: 2px;
    line-height: 1;
    white-space: nowrap;
}

/* 星号列：垂直方向跳过 label 行，与输入框底部对齐 */
.part-asterisk {
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    align-items: center;
    padding-top: 18px;   /* 匹配 .part-label(12px) + gap(6px) ≈ 18px */
    min-width: 0;
}
.asterisk {
    font-size: 28px;
    font-weight: 800;
    color: var(--red-500);
    letter-spacing: 2px;
    line-height: 44px;
    height: 44px;
    white-space: nowrap;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-family: "SF Mono", Consolas, monospace;
}

.tool-input-v2 {
    width: 100%;
    height: 44px;
    padding: 0 12px;
    text-align: center;
    font-size: 20px;
    font-weight: 800;
    letter-spacing: 3px;
    color: var(--gray-900);
    background: #fff;
    box-sizing: border-box;
}
.tool-input-v2::placeholder {
    color: var(--gray-300); font-weight: 600; letter-spacing: 2px;
}

/* 下拉框：省区/城市 */
.select-wrap {
    position: relative;
    width: 100%;
    height: 44px;
    box-sizing: border-box;
}
.tool-select {
    appearance: none; -webkit-appearance: none; -moz-appearance: none;
    width: 100%;
    height: 44px;
    padding: 0 40px 0 14px;
    border: 1.5px solid var(--gray-300);
    border-radius: var(--radius);
    background: #fff;
    color: var(--gray-800);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    outline: none;
    transition: all .25s ease;
    box-sizing: border-box;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.tool-select:hover { border-color: var(--gray-400); }
.tool-select:focus {
    border-color: var(--red-500);
    box-shadow: 0 0 0 4px rgba(245, 63, 63, 0.12);
}
.select-arrow {
    position: absolute;
    right: 14px;
    top: 50%;
    transform: translateY(-50%);
    width: 0; height: 0;
    pointer-events: none;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 6px solid var(--gray-400);
    transition: all .25s ease;
}
.select-wrap:focus-within .select-arrow {
    border-top-color: var(--red-500);
    transform: translateY(-50%) rotate(180deg);
}

/* 查询按钮：第三行全宽内居中，给一个醒目的固定宽度 */
.btn-query {
    justify-self: center;
    min-width: 180px;
    width: auto;
    height: 46px;
    padding: 0 36px;
    font-size: 16px;
    border-radius: var(--radius);
    white-space: nowrap;
    margin-top: 0;   /* 第三行无 label，不需要 18px 占位 */
}

/* ---------- 响应式 ---------- */

/* 中等屏（≤980px）：三行结构不变，仅微调 */
@media (max-width: 980px) {
    .tool-row-v2 {
        grid-template-columns: repeat(6, 1fr);
        row-gap: 14px;
        column-gap: 12px;
    }
    .asterisk {
        font-size: 24px;
        gap: 4px;
        letter-spacing: 1px;
    }
    .btn-query { min-width: 200px; }
}

/* 手机（≤640px）：第1行保留三段、第2行两个下拉各占一行、按钮全宽 */
@media (max-width: 640px) {
    .tool-row-v2 {
        /* 3 列栅格：前3位 | 星号 | 后4位 */
        grid-template-columns: 1fr auto 1fr;
        grid-template-rows: auto; /* 让额外元素自动下一行 */
    }
    .part-prefix    { grid-column: 1 / 2; grid-row: auto; }
    .part-asterisk  { grid-column: 2 / 3; grid-row: auto; }
    .part-suffix    { grid-column: 3 / 4; grid-row: auto; }
    .part-province  { grid-column: 1 / 4; grid-row: auto; }
    .part-city      { grid-column: 1 / 4; grid-row: auto; }
    .btn-query {
        grid-column: 1 / 4;
        grid-row: auto;
        width: 100%;
        height: 48px;
        font-size: 17px;
        justify-self: stretch;
    }
    .asterisk {
        font-size: 22px;
        gap: 4px;
        letter-spacing: 0;
    }
    .tool-input-v2 {
        font-size: 18px;
        letter-spacing: 2px;
    }
}

/* 查询结果 */
.result {
    margin-top: 16px;
    background: linear-gradient(180deg, #fff, var(--gray-50));
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 20px 22px;
    animation: fadeUp .4s ease;
}
@keyframes fadeUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
.result-head {
    display: flex; align-items: center; justify-content: space-between;
    padding-bottom: 16px; border-bottom: 1px dashed var(--gray-200);
}
.result-label { font-size: 12px; color: var(--gray-400); display: block; }
.result-phone { font-size: 22px; font-weight: 800; color: var(--gray-900); letter-spacing: 2px; }
.result-status {
    display: inline-flex; align-items: center; gap: 6px;
    font-size: 13px; font-weight: 600; color: var(--green-500);
    padding: 5px 12px; background: var(--green-50); border-radius: 30px;
}
.status-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--green-500); box-shadow: 0 0 0 3px rgba(0,180,42,0.15); }

.result-grid {
    display: grid; grid-template-columns: repeat(3, 1fr);
    gap: 1px; margin-top: 16px;
    background: var(--gray-200); border-radius: var(--radius); overflow: hidden;
}
.result-cell {
    background: #fff; padding: 14px 16px;
    display: flex; flex-direction: column; gap: 6px;
}
.cell-label { font-size: 12px; color: var(--gray-400); font-weight: 600; }
.cell-value { font-size: 16px; font-weight: 700; color: var(--gray-900); }
.cell-accent { color: var(--red-500); }
.result-foot { margin-top: 14px; }
.result-tip { font-size: 12px; color: var(--gray-400); }

/* hero stats */
.hero-stats {
    margin-top: 32px; display: flex; align-items: center; gap: 28px;
    padding: 18px 24px; background: #fff; border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg); box-shadow: var(--shadow-sm);
    width: fit-content;
}
.stat { display: flex; flex-direction: column; gap: 2px; }
.stat-num { font-size: 26px; font-weight: 800; color: var(--gray-900); line-height: 1; }
.stat-unit { font-size: 14px; font-weight: 600; color: var(--gray-500); margin-left: 2px; }
.stat-label { font-size: 13px; color: var(--gray-500); }
.stat-divider { width: 1px; height: 32px; background: var(--gray-200); }

/* hero visual */
.hero-visual { position: relative; }
.hero-img {
    width: 100%; border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--gray-200);
}
.float-card {
    position: absolute; background: #fff; border: 1px solid var(--gray-200);
    border-radius: var(--radius); padding: 10px 16px;
    box-shadow: var(--shadow-lg);
    display: flex; flex-direction: column; gap: 2px;
    animation: floaty 3.5s ease-in-out infinite;
}
.float-card .fc-icon { font-size: 11px; color: var(--gray-400); font-weight: 600; }
.float-card .fc-text { font-size: 16px; font-weight: 800; color: var(--gray-900); }
.float-card-1 { top: 12%; left: -22px; animation-delay: 0s; }
.float-card-1 .fc-text { color: var(--red-500); }
.float-card-2 { top: 48%; right: -18px; animation-delay: 1.2s; }
.float-card-3 { bottom: 8%; left: 6%; animation-delay: 2.2s; }
@keyframes floaty { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }

/* ===== 通用 section ===== */
.section { padding: 88px 0; }
.section-alt { background: var(--gray-50); }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.section-eyebrow {
    display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: 2px;
    color: var(--red-500); margin-bottom: 12px;
}
.section-title {
    font-size: 34px; font-weight: 800; color: var(--gray-900); letter-spacing: -.3px;
}
.section-sub { margin-top: 14px; font-size: 16px; color: var(--gray-500); }

/* ===== 功能特性 ===== */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-card {
    background: #fff; border: 1px solid var(--gray-200); border-radius: var(--radius-lg);
    padding: 32px 28px; box-shadow: var(--shadow-sm);
    transition: all .3s ease; position: relative; overflow: hidden;
}
.feature-card::before {
    content: ""; position: absolute; top: 0; left: 0; width: 100%; height: 3px;
    background: linear-gradient(90deg, var(--red-500), var(--red-400));
    transform: scaleX(0); transform-origin: left; transition: transform .3s ease;
}
.feature-card:hover { transform: translateY(-6px); border-color: var(--red-100); box-shadow: var(--shadow-lg); }
.feature-card:hover::before { transform: scaleX(1); }
.feature-icon {
    width: 54px; height: 54px; border-radius: var(--radius);
    background: linear-gradient(135deg, var(--red-50), #fff);
    color: var(--red-500);
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 18px; border: 1px solid var(--red-100);
    transition: all .3s ease;
}
.feature-card:hover .feature-icon { background: var(--red-500); color: #fff; border-color: var(--red-500); }
.feature-title { font-size: 19px; font-weight: 700; color: var(--gray-900); margin-bottom: 10px; }
.feature-desc { font-size: 14.5px; color: var(--gray-500); line-height: 1.7; }

/* ===== 使用场景 ===== */
.scenes-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.scene-card {
    background: #fff; border: 1px solid var(--gray-200); border-radius: var(--radius-lg);
    padding: 30px 32px; display: flex; gap: 24px; align-items: flex-start;
    box-shadow: var(--shadow-sm); transition: all .3s ease;
}
.scene-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--red-100); }
.scene-num {
    flex-shrink: 0; width: 52px; height: 52px; border-radius: var(--radius);
    background: var(--gray-900); color: #fff;
    display: flex; align-items: center; justify-content: center;
    font-size: 20px; font-weight: 800; font-family: "SF Mono", Consolas, monospace;
    transition: background .3s ease;
}
.scene-card:hover .scene-num { background: var(--red-500); }
.scene-title { font-size: 19px; font-weight: 700; color: var(--gray-900); margin-bottom: 8px; }
.scene-desc { font-size: 14.5px; color: var(--gray-500); line-height: 1.7; }

/* ===== 极速测网推广 ===== */
.promo {
    position: relative; overflow: hidden;
    background: linear-gradient(135deg, var(--gray-900) 0%, #2c2f36 100%);
    color: #fff; padding: 72px 0;
}
.promo::before {
    content: ""; position: absolute; top: -40%; right: -10%; width: 600px; height: 600px;
    background: radial-gradient(circle, rgba(245, 63, 63, 0.28), transparent 60%);
    border-radius: 50%;
}
.promo-inner { position: relative; z-index: 1; display: grid; grid-template-columns: 1.1fr 1fr; gap: 56px; align-items: center; }
.promo-tag {
    display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: 1px;
    padding: 5px 14px; background: rgba(245, 63, 63, 0.18); color: var(--red-400);
    border: 1px solid rgba(245, 63, 63, 0.4); border-radius: 30px;
}
.promo-title { font-size: 36px; font-weight: 800; margin-top: 16px; color: #fff; letter-spacing: -.3px; }
.promo-desc { margin-top: 16px; font-size: 16px; color: rgba(255,255,255,0.72); line-height: 1.8; }
.promo-points { margin-top: 24px; display: grid; grid-template-columns: 1fr 1fr; gap: 12px 28px; }
.promo-points li { display: flex; align-items: center; gap: 10px; font-size: 14.5px; color: rgba(255,255,255,0.85); }
.check {
    flex-shrink: 0; width: 20px; height: 20px; border-radius: 50%;
    background: var(--red-500); position: relative; flex: 0 0 20px;
}
.check::after {
    content: ""; position: absolute; left: 6px; top: 3px; width: 5px; height: 9px;
    border: solid #fff; border-width: 0 2px 2px 0; transform: rotate(45deg);
}
.btn-promo { margin-top: 32px; }

.promo-visual { position: relative; }
.promo-img {
    width: 100%; border-radius: var(--radius-lg);
    box-shadow: 0 20px 50px rgba(0,0,0,0.4);
    border: 1px solid rgba(255,255,255,0.12);
}
.promo-domain {
    position: absolute; bottom: 16px; left: 16px;
    background: rgba(0,0,0,0.55); backdrop-filter: blur(8px);
    padding: 8px 16px; border-radius: 30px;
    font-size: 13px; font-weight: 600; color: #fff;
    border: 1px solid rgba(255,255,255,0.15);
}
.promo-domain:hover { background: var(--red-500); }

/* ===== 隐私说明 ===== */
.privacy { background: #fff; }
.privacy-inner { display: grid; grid-template-columns: 1fr 1.1fr; gap: 56px; align-items: center; }
.privacy-img { width: 100%; border-radius: var(--radius-xl); box-shadow: var(--shadow); border: 1px solid var(--gray-200); }
.privacy-content { }
.privacy-text { margin-top: 16px; font-size: 16px; color: var(--gray-600); line-height: 1.85; }
.privacy-list { margin-top: 28px; display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.privacy-item { display: flex; align-items: center; gap: 10px; font-size: 14.5px; color: var(--gray-700); font-weight: 500; }
.pi-icon {
    flex-shrink: 0; width: 24px; height: 24px; border-radius: 50%;
    background: var(--green-50); color: var(--green-500);
    display: flex; align-items: center; justify-content: center;
}

/* ===== FAQ ===== */
.faq-list { display: flex; flex-direction: column; gap: 14px; }
.faq-item {
    background: #fff; border: 1px solid var(--gray-200); border-radius: var(--radius-lg);
    padding: 0 24px; box-shadow: var(--shadow-sm);
    transition: all .25s ease;
}
.faq-item[open] { border-color: var(--red-100); box-shadow: var(--shadow); }
.faq-item[open] .faq-icon { background: var(--red-500); color: #fff; transform: rotate(45deg); }
.faq-q {
    display: flex; align-items: center; justify-content: space-between; gap: 16px;
    padding: 20px 0; cursor: pointer; list-style: none;
    font-size: 16.5px; font-weight: 700; color: var(--gray-900);
}
.faq-q::-webkit-details-marker { display: none; }
.faq-icon {
    flex-shrink: 0; width: 26px; height: 26px; border-radius: 50%;
    background: var(--gray-100); color: var(--gray-600);
    display: flex; align-items: center; justify-content: center;
    position: relative; transition: all .25s ease;
}
.faq-icon::before { content: ""; position: absolute; width: 12px; height: 2px; background: currentColor; border-radius: 2px; }
.faq-icon::after { content: ""; position: absolute; width: 2px; height: 12px; background: currentColor; border-radius: 2px; }
.faq-a { padding: 0 0 20px; }
.faq-a p { font-size: 15px; color: var(--gray-600); line-height: 1.8; }

/* ===== CTA ===== */
.cta {
    background: linear-gradient(135deg, var(--red-500), var(--red-600));
    padding: 64px 0; text-align: center; position: relative; overflow: hidden;
}
.cta::before {
    content: ""; position: absolute; inset: 0;
    background-image: radial-gradient(circle at 20% 30%, rgba(255,255,255,0.12), transparent 40%),
                      radial-gradient(circle at 80% 70%, rgba(255,255,255,0.1), transparent 40%);
}
.cta-inner { position: relative; z-index: 1; }
.cta-title { font-size: 32px; font-weight: 800; color: #fff; letter-spacing: -.3px; }
.cta-desc { margin-top: 14px; font-size: 16px; color: rgba(255,255,255,0.88); }
.cta .btn { margin-top: 28px; }

/* ===== Footer ===== */
.footer { background: var(--gray-900); color: rgba(255,255,255,0.6); padding: 60px 0 0; }
.footer-inner { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: 40px; padding-bottom: 40px; }
.brand-footer .brand-logo { width: 36px; height: 36px; }
.brand-footer .brand-name { color: #fff; }
.footer-desc { margin-top: 14px; font-size: 14px; line-height: 1.75; color: rgba(255,255,255,0.5); max-width: 320px; }
.footer-title { font-size: 15px; font-weight: 700; color: #fff; margin-bottom: 16px; }
.footer-link { display: block; font-size: 14px; color: rgba(255,255,255,0.55); padding: 6px 0; transition: all .2s ease; }
.footer-link:hover { color: var(--red-400); transform: translateX(3px); }
.footer-note { font-size: 13.5px; color: rgba(255,255,255,0.45); line-height: 1.75; margin-bottom: 8px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding: 20px 0; }
.footer-bottom-inner { display: flex; align-items: center; justify-content: space-between; font-size: 13px; color: rgba(255,255,255,0.45); }
.footer-links a:hover { color: var(--red-400); }

/* ===== 返回顶部 ===== */
.back-top {
    position: fixed; right: 28px; bottom: 28px; z-index: 90;
    width: 46px; height: 46px; border-radius: 50%;
    background: var(--red-500); color: #fff;
    box-shadow: var(--shadow-red);
    display: flex; align-items: center; justify-content: center;
    opacity: 0; visibility: hidden; transform: translateY(20px) scale(.8);
    transition: all .3s ease;
}
.back-top.show { opacity: 1; visibility: visible; transform: translateY(0) scale(1); }
.back-top:hover { background: var(--red-600); transform: translateY(-3px); }

/* ===== 提示弹窗 toast ===== */
.toast {
    position: fixed; top: 28px; left: 50%; transform: translateX(-50%) translateY(-30px);
    z-index: 200; min-width: 320px; max-width: 460px;
    background: #fff; border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg); border: 1px solid var(--gray-200);
    display: flex; align-items: center; gap: 14px; padding: 16px 18px;
    opacity: 0; visibility: hidden; transition: all .35s cubic-bezier(.22,1,.36,1);
}
.toast.show { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
.toast.success { border-left: 4px solid var(--green-500); }
.toast.error { border-left: 4px solid var(--red-500); }
.toast.info { border-left: 4px solid var(--gray-500); }
.toast-icon {
    flex-shrink: 0; width: 32px; height: 32px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    color: #fff; font-size: 18px;
}
.toast.success .toast-icon { background: var(--green-500); }
.toast.error .toast-icon { background: var(--red-500); }
.toast.info .toast-icon { background: var(--gray-500); }
.toast-body { flex: 1; display: flex; flex-direction: column; gap: 2px; }
.toast-title { font-size: 15px; font-weight: 700; color: var(--gray-900); }
.toast-msg { font-size: 13.5px; color: var(--gray-500); }
.toast-close {
    flex-shrink: 0; width: 26px; height: 26px; border-radius: 50%;
    color: var(--gray-400); font-size: 20px; line-height: 1;
    display: flex; align-items: center; justify-content: center;
    transition: all .2s ease;
}
.toast-close:hover { background: var(--gray-100); color: var(--gray-700); }

/* ===== 响应式 ===== */
@media (max-width: 980px) {
    .hero-inner { grid-template-columns: 1fr; gap: 40px; }
    .hero-visual { max-width: 480px; margin: 0 auto; }
    .hero-title { font-size: 38px; }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .promo-inner, .privacy-inner { grid-template-columns: 1fr; gap: 36px; }
    .promo-visual { max-width: 460px; margin: 0 auto; }
    .footer-inner { grid-template-columns: 1fr 1fr; gap: 32px; }
    .nav-menu {
        position: fixed; top: calc(36px + var(--header-h)); left: 0; right: 0;
        background: #fff; flex-direction: column; align-items: stretch;
        padding: 12px 24px; gap: 4px; border-bottom: 1px solid var(--gray-200);
        box-shadow: var(--shadow); transform: translateY(-12px); opacity: 0; visibility: hidden;
        transition: all .25s ease;
    }
    .nav-menu.open { transform: translateY(0); opacity: 1; visibility: visible; }
    .nav-link { padding: 12px 14px; }
    .nav-link-accent { margin: 6px 0 0; text-align: center; }
    .nav-toggle { display: flex; }
    .result-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
    .container { padding: 0 16px; }
    .hero { padding: 40px 0 56px; }
    .hero-title { font-size: 30px; }
    .hero-desc { font-size: 15px; }
    .tool-row { flex-direction: column; }
    .btn-primary { height: 46px; }
    .tool-input { font-size: 15px; }
    .hero-stats { width: 100%; justify-content: space-between; gap: 12px; padding: 14px 18px; }
    .stat-num { font-size: 22px; }
    .section { padding: 60px 0; }
    .section-title { font-size: 26px; }
    .features-grid { grid-template-columns: 1fr; gap: 16px; }
    .scenes-grid { grid-template-columns: 1fr; }
    .scene-card { padding: 22px; gap: 16px; }
    .promo { padding: 52px 0; }
    .promo-title { font-size: 26px; }
    .promo-points { grid-template-columns: 1fr; }
    .privacy-list { grid-template-columns: 1fr; }
    .result-grid { grid-template-columns: 1fr 1fr; }
    .result-head { flex-direction: column; align-items: flex-start; gap: 10px; }
    .footer-inner { grid-template-columns: 1fr; gap: 28px; }
    .footer-bottom-inner { flex-direction: column; gap: 8px; text-align: center; }
    .float-card { display: none; }
    .topbar-text { display: none; }
    .cta-title { font-size: 24px; }
}