/* =========================================================
   ScreenToGif 中文官网样式  ·  扁平 / 现代 / 专业
   配色基于品牌 Logo：活力橙 + 深墨灰
   ========================================================= */
:root{
  --brand:#FF6B1A;
  --brand-dark:#E8550A;
  --brand-light:#FFF1E8;
  --ink:#1F2430;
  --ink-2:#454C5C;
  --ink-3:#7A8296;
  --line:#E8EAF0;
  --bg:#FFFFFF;
  --bg-soft:#F7F8FB;
  --radius:12px;
  --shadow:0 8px 30px rgba(31,36,48,.08);
  --shadow-lg:0 20px 60px rgba(31,36,48,.14);
  --maxw:1180px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,"Hiragino Sans GB",sans-serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  font-size:16px;
}
img{max-width:100%;display:block}
a{color:var(--brand);text-decoration:none}
a:hover{color:var(--brand-dark)}
ul{list-style:none}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
section{padding:88px 0}
.section-head{text-align:center;max-width:720px;margin:0 auto 56px}
.section-tag{
  display:inline-block;padding:5px 16px;border-radius:999px;
  background:var(--brand-light);color:var(--brand-dark);
  font-size:13px;font-weight:600;letter-spacing:1px;margin-bottom:16px;
}
.section-head h2{font-size:34px;line-height:1.3;font-weight:700;letter-spacing:.5px}
.section-head p{margin-top:14px;color:var(--ink-3);font-size:17px}

/* ---------- 顶部导航 ---------- */
.header{
  position:sticky;top:0;z-index:100;background:rgba(255,255,255,.94);
  backdrop-filter:saturate(180%) blur(10px);
  border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;justify-content:space-between;height:70px}
.logo{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:700;color:var(--ink)}
.logo svg{width:34px;height:34px}
.logo span em{font-style:normal;color:var(--brand)}
.nav-menu{display:flex;align-items:center;gap:6px}
.nav-menu a{
  color:var(--ink-2);font-size:15px;font-weight:500;
  padding:8px 16px;border-radius:8px;transition:.2s;
}
.nav-menu a:hover{color:var(--brand);background:var(--brand-light)}
.nav-menu a.active{color:var(--brand);background:var(--brand-light)}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;padding:8px}
.nav-toggle span{display:block;width:24px;height:2px;background:var(--ink);margin:5px 0;border-radius:2px;transition:.25s}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:14px 34px;border-radius:10px;font-size:16px;font-weight:600;
  cursor:pointer;border:0;transition:.2s;line-height:1.4;
}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 8px 20px rgba(255,107,26,.32)}
.btn-primary:hover{background:var(--brand-dark);color:#fff;transform:translateY(-2px);box-shadow:0 12px 26px rgba(255,107,26,.4)}
.btn-ghost{background:#fff;color:var(--ink);border:1px solid var(--line)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand)}
.btn-sm{padding:9px 22px;font-size:14px}
.btn-lg{padding:17px 46px;font-size:17px}

/* ---------- 首页 Hero ---------- */
.hero{padding:96px 0 80px;background:linear-gradient(180deg,#FFF7F1 0%,#fff 100%);overflow:hidden}
.hero-inner{display:grid;grid-template-columns:1.05fr .95fr;gap:64px;align-items:center}
.hero-badge{
  display:inline-flex;align-items:center;gap:8px;background:#fff;border:1px solid var(--line);
  padding:6px 16px 6px 8px;border-radius:999px;font-size:13.5px;color:var(--ink-2);
  box-shadow:var(--shadow);margin-bottom:24px;
}
.hero-badge b{background:var(--brand);color:#fff;font-weight:600;padding:2px 10px;border-radius:999px;font-size:12.5px}
.hero h1{font-size:46px;line-height:1.25;font-weight:800;letter-spacing:.5px}
.hero h1 .hl{color:var(--brand)}
.hero-sub{margin:22px 0 34px;color:var(--ink-2);font-size:17.5px;max-width:520px}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap}
.hero-stats{display:flex;gap:44px;margin-top:48px}
.hero-stats .num{font-size:28px;font-weight:800;color:var(--ink)}
.hero-stats .num i{font-style:normal;color:var(--brand)}
.hero-stats .lbl{font-size:13.5px;color:var(--ink-3);margin-top:2px}

/* Hero 右侧界面示意（纯 CSS 扁平插画） */
.hero-visual{position:relative}
.mock-recorder{
  background:#fff;border-radius:14px;box-shadow:var(--shadow-lg);
  border:1px solid var(--line);overflow:hidden;
}
.mock-bar{display:flex;align-items:center;gap:8px;padding:12px 16px;border-bottom:1px solid var(--line);background:var(--bg-soft)}
.mock-dot{width:11px;height:11px;border-radius:50%}
.mock-body{padding:26px;display:grid;gap:14px}
.mock-screen{
  border:2px dashed var(--brand);border-radius:10px;background:var(--brand-light);
  height:190px;display:flex;align-items:center;justify-content:center;
  color:var(--brand-dark);font-weight:600;font-size:15px;position:relative;
}
.mock-screen::after{
  content:"REC";position:absolute;top:12px;right:14px;font-size:11px;font-weight:700;
  color:#fff;background:#EF4444;padding:3px 10px;border-radius:999px;letter-spacing:1px;
}
.mock-screen::before{
  content:"";position:absolute;top:16px;right:64px;width:9px;height:9px;border-radius:50%;
  background:#EF4444;animation:blink 1.2s infinite;
}
@keyframes blink{0%,100%{opacity:1}50%{opacity:.15}}
.mock-row{display:flex;gap:10px}
.mock-chip{
  flex:1;background:var(--bg-soft);border:1px solid var(--line);border-radius:8px;
  padding:10px 6px;text-align:center;font-size:12.5px;color:var(--ink-3);font-weight:500;
}
.mock-chip.on{background:var(--brand);border-color:var(--brand);color:#fff}
.float-card{
  position:absolute;background:#fff;border-radius:12px;box-shadow:var(--shadow-lg);
  border:1px solid var(--line);padding:14px 18px;display:flex;align-items:center;gap:12px;
}
.float-card .ic{width:38px;height:38px;border-radius:9px;background:var(--brand-light);display:flex;align-items:center;justify-content:center}
.float-card b{font-size:14px;display:block}
.float-card small{color:var(--ink-3);font-size:12px}
.fc-1{top:-24px;right:-18px;animation:floaty 5s ease-in-out infinite}
.fc-2{bottom:-22px;left:-20px;animation:floaty 6s ease-in-out infinite reverse}
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}

/* ---------- 特性卡片 ---------- */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:34px 28px;transition:.25s;
}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:#FFD9C2}
.card .icon{
  width:52px;height:52px;border-radius:12px;background:var(--brand-light);
  display:flex;align-items:center;justify-content:center;margin-bottom:20px;
}
.card h3{font-size:19px;margin-bottom:10px}
.card p{color:var(--ink-3);font-size:14.5px}

/* ---------- 使用场景 ---------- */
.scenes{background:var(--bg-soft)}
.scene-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:26px}
.scene{
  display:flex;gap:22px;background:#fff;border:1px solid var(--line);
  border-radius:var(--radius);padding:30px;transition:.25s;
}
.scene:hover{box-shadow:var(--shadow-lg);transform:translateY(-4px)}
.scene .icon{width:56px;height:56px;flex:none;border-radius:14px;background:var(--brand);display:flex;align-items:center;justify-content:center}
.scene h3{font-size:18px;margin-bottom:8px}
.scene p{color:var(--ink-3);font-size:14.5px}

/* ---------- 用户评价 ---------- */
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.review{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:32px 28px;display:flex;flex-direction:column;transition:.25s;
}
.review:hover{box-shadow:var(--shadow-lg);transform:translateY(-4px)}
.stars{color:#F7B500;font-size:16px;letter-spacing:3px;margin-bottom:16px}
.review p{color:var(--ink-2);font-size:15px;flex:1}
.review-user{display:flex;align-items:center;gap:12px;margin-top:24px;padding-top:20px;border-top:1px solid var(--line)}
.avatar{
  width:44px;height:44px;border-radius:50%;background:var(--brand);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:700;font-size:16px;flex:none;
}
.review-user b{font-size:15px;display:block}
.review-user small{color:var(--ink-3);font-size:13px}

/* ---------- 步骤流程 ---------- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;counter-reset:step}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 24px;text-align:center;position:relative}
.step::before{
  counter-increment:step;content:counter(step);
  width:44px;height:44px;border-radius:50%;background:var(--brand);color:#fff;
  font-size:18px;font-weight:700;display:flex;align-items:center;justify-content:center;
  margin:0 auto 18px;
}
.step h3{font-size:17px;margin-bottom:8px}
.step p{color:var(--ink-3);font-size:14px}

/* ---------- CTA 横幅 ---------- */
.cta-banner{background:linear-gradient(120deg,var(--brand) 0%,#FF8F4D 100%);border-radius:20px;padding:64px 48px;text-align:center;color:#fff}
.cta-banner h2{font-size:32px;margin-bottom:14px}
.cta-banner p{opacity:.92;margin-bottom:32px;font-size:17px}
.cta-banner .btn-primary{background:#fff;color:var(--brand-dark);box-shadow:0 10px 24px rgba(0,0,0,.15)}
.cta-banner .btn-primary:hover{color:var(--brand-dark);transform:translateY(-2px)}

/* ---------- 页脚 ---------- */
.footer{background:#171B24;color:#B9C0D0;padding:64px 0 0}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;padding-bottom:48px}
.footer .logo{color:#fff;margin-bottom:16px}
.footer-desc{font-size:14px;color:#8B93A7;max-width:300px}
.footer h4{color:#fff;font-size:15px;margin-bottom:18px}
.footer li{margin-bottom:10px}
.footer a{color:#B9C0D0;font-size:14px}
.footer a:hover{color:var(--brand)}
.footer-bottom{border-top:1px solid #2A303E;padding:22px 0;font-size:13px;color:#7A8296;text-align:center}

/* ---------- 下载弹窗 ---------- */
.modal-mask{
  position:fixed;inset:0;background:rgba(23,27,36,.6);z-index:200;
  display:none;align-items:center;justify-content:center;padding:20px;
  backdrop-filter:blur(4px);
}
.modal-mask.show{display:flex}
.modal{
  background:#fff;border-radius:18px;max-width:520px;width:100%;
  padding:40px 36px 36px;position:relative;text-align:center;
  animation:pop .28s cubic-bezier(.2,.9,.3,1.2);
  max-height:90vh;overflow-y:auto;
}
@keyframes pop{from{transform:scale(.9);opacity:0}to{transform:scale(1);opacity:1}}
.modal-close{
  position:absolute;top:14px;right:16px;width:34px;height:34px;border:0;border-radius:50%;
  background:var(--bg-soft);color:var(--ink-3);font-size:18px;cursor:pointer;line-height:1;
}
.modal-close:hover{background:var(--brand-light);color:var(--brand)}
.modal h3{font-size:23px;margin-bottom:6px}
.modal .ver{color:var(--ink-3);font-size:14px;margin-bottom:26px}
.qr-row{display:flex;gap:24px;justify-content:center;margin-bottom:26px}
.qr-item{flex:1;max-width:190px}
.qr-item img{border:1px solid var(--line);border-radius:12px;padding:8px;background:#fff}
.qr-item b{display:block;margin-top:12px;font-size:15px}
.qr-item small{color:var(--ink-3);font-size:12.5px;display:block;margin-top:3px}
.modal .direct{
  display:block;background:var(--bg-soft);border:1px solid var(--line);border-radius:10px;
  padding:13px;font-size:13.5px;color:var(--ink-2);
}
.modal .direct:hover{border-color:var(--brand);color:var(--brand)}

/* ---------- 子页面通用 ---------- */
.page-hero{background:linear-gradient(180deg,#FFF7F1,#fff);padding:72px 0 64px;text-align:center}
.page-hero h1{font-size:38px;font-weight:800}
.page-hero p{color:var(--ink-3);margin-top:14px;font-size:17px;max-width:640px;margin-left:auto;margin-right:auto}

/* 功能详情块 */
.feature-block{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center;padding:56px 0}
.feature-block + .feature-block{border-top:1px solid var(--line)}
.feature-block.rev .f-text{order:2}
.f-text h2{font-size:28px;margin-bottom:16px}
.f-text p{color:var(--ink-2);margin-bottom:18px}
.f-text li{color:var(--ink-2);font-size:15px;margin-bottom:10px;padding-left:26px;position:relative}
.f-text li::before{content:"✓";position:absolute;left:0;color:var(--brand);font-weight:700}
.f-visual{background:var(--bg-soft);border:1px solid var(--line);border-radius:16px;padding:36px;display:flex;align-items:center;justify-content:center;min-height:280px}

/* 下载中心 */
.dl-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:26px}
.dl-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:36px 30px;text-align:center;transition:.25s;display:flex;flex-direction:column;
}
.dl-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-4px)}
.dl-card.recommend{border:2px solid var(--brand);position:relative}
.dl-card.recommend::after{
  content:"推荐";position:absolute;top:-13px;left:50%;transform:translateX(-50%);
  background:var(--brand);color:#fff;font-size:12.5px;font-weight:600;padding:3px 16px;border-radius:999px;
}
.dl-card .icon{width:60px;height:60px;border-radius:14px;background:var(--brand-light);margin:0 auto 20px;display:flex;align-items:center;justify-content:center}
.dl-card h3{font-size:19px}
.dl-card .ver-num{color:var(--brand);font-weight:600;font-size:14px;margin:6px 0 12px}
.dl-card p{color:var(--ink-3);font-size:14px;flex:1;margin-bottom:22px}
.sys-table{width:100%;border-collapse:collapse;background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.sys-table th,.sys-table td{padding:16px 22px;text-align:left;border-bottom:1px solid var(--line);font-size:15px}
.sys-table th{background:var(--bg-soft);font-weight:600;width:220px}
.sys-table tr:last-child td{border-bottom:0}

/* 教程页 */
.tutorial-layout{display:grid;grid-template-columns:250px 1fr;gap:48px}
.toc{position:sticky;top:96px;align-self:start;background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:24px}
.toc b{display:block;margin-bottom:12px;font-size:15px}
.toc a{display:block;color:var(--ink-2);font-size:14px;padding:7px 12px;border-radius:8px}
.toc a:hover{background:var(--brand-light);color:var(--brand)}
.article h2{font-size:26px;margin:44px 0 18px;padding-top:12px}
.article h2:first-child{margin-top:0}
.article h3{font-size:19px;margin:28px 0 12px}
.article p{color:var(--ink-2);margin-bottom:14px}
.article ol,.article ul{margin:0 0 16px 22px;color:var(--ink-2)}
.article ol li,.article ul li{margin-bottom:8px;list-style:decimal}
.article ul li{list-style:disc}
.article .tip{
  background:var(--brand-light);border-left:4px solid var(--brand);
  padding:16px 20px;border-radius:0 10px 10px 0;margin:18px 0;font-size:14.5px;color:var(--ink-2);
}
.kbd{
  display:inline-block;background:#fff;border:1px solid var(--line);border-bottom-width:2px;
  border-radius:6px;padding:1px 9px;font-size:13px;font-family:Consolas,monospace;color:var(--ink);
}
.faq-item{border:1px solid var(--line);border-radius:var(--radius);margin-bottom:14px;background:#fff;overflow:hidden}
.faq-q{
  width:100%;text-align:left;background:none;border:0;padding:20px 24px;font-size:16px;font-weight:600;
  cursor:pointer;display:flex;justify-content:space-between;align-items:center;color:var(--ink);font-family:inherit;
}
.faq-q::after{content:"+";font-size:22px;color:var(--brand);transition:.25s}
.faq-item.open .faq-q::after{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease;color:var(--ink-2);font-size:14.5px}
.faq-a div{padding:0 24px 22px}

/* 关于页 */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}
.badge-row{display:flex;gap:14px;flex-wrap:wrap;margin-top:26px}
.info-badge{background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px 22px;text-align:center}
.info-badge b{display:block;font-size:20px;color:var(--brand)}
.info-badge small{color:var(--ink-3);font-size:12.5px}

/* 入场动画 */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s ease,transform .7s ease}
.reveal.visible{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:960px){
  .hero-inner{grid-template-columns:1fr;gap:48px}
  .hero h1{font-size:36px}
  .grid-3,.review-grid,.dl-grid{grid-template-columns:1fr 1fr}
  .scene-grid{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .feature-block{grid-template-columns:1fr;gap:32px}
  .feature-block.rev .f-text{order:0}
  .tutorial-layout{grid-template-columns:1fr}
  .toc{position:static}
  .about-grid{grid-template-columns:1fr}
}
@media (max-width:640px){
  section{padding:64px 0}
  .grid-3,.review-grid,.dl-grid,.steps{grid-template-columns:1fr}
  .hero{padding:64px 0}
  .hero h1{font-size:30px}
  .hero-stats{gap:26px}
  .nav-menu{
    position:absolute;top:70px;left:0;right:0;background:#fff;flex-direction:column;
    align-items:stretch;padding:12px 20px 20px;border-bottom:1px solid var(--line);
    box-shadow:var(--shadow-lg);display:none;
  }
  .nav-menu.open{display:flex}
  .nav-menu a{padding:12px 14px}
  .nav-toggle{display:block}
  .cta-banner{padding:48px 26px}
  .cta-banner h2{font-size:26px}
  .page-hero h1{font-size:30px}
  .qr-row{flex-direction:column;align-items:center}
  .footer-grid{grid-template-columns:1fr}
  .fc-1{right:0}
  .fc-2{left:0}
}