/* ===== Reset & 变量 ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --blue:#2563eb;--blue-d:#1d4ed8;--blue-l:#eff6ff;
  --green:#16a34a;--green-l:#f0fdf4;
  --warn:#d97706;--warn-l:#fffbeb;
  --g50:#f9fafb;--g100:#f3f4f6;--g200:#e5e7eb;--g300:#d1d5db;
  --g500:#6b7280;--g700:#374151;--g900:#111827;
  --r:12px;
  --sh:0 1px 3px rgba(0,0,0,.1),0 1px 2px rgba(0,0,0,.06);
  --sh-lg:0 10px 25px rgba(0,0,0,.12);
  --sh-xl:0 20px 40px rgba(0,0,0,.18);
  --font:-apple-system,BlinkMacSystemFont,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
}
html,body{height:100%}
body{font-family:var(--font);color:var(--g900);background:#f0f4ff;min-height:100vh;display:flex;flex-direction:column}

/* ===== 主区域 ===== */
.main{
  flex:1;display:flex;flex-direction:column;
  max-width:1100px;width:100%;margin:0 auto;
  padding:32px 32px 48px;
  gap:20px;
}

/* ===== 欢迎横幅 ===== */
.welcome-banner{
  display:flex;align-items:flex-start;gap:16px;
  background:linear-gradient(135deg,#1e40af,#2563eb);
  color:#fff;border-radius:var(--r);padding:24px 28px;
  box-shadow:0 4px 14px rgba(37,99,235,.3);
}
.welcome-icon{line-height:1;flex-shrink:0;margin-top:2px;opacity:.9}
.welcome-title{font-size:17px;font-weight:700;margin-bottom:8px}
.welcome-sub{font-size:13px;opacity:.88;line-height:1.7}
.welcome-sub2{margin-top:8px;opacity:.75}

/* ===== 系统识别（底部弱化版） ===== */
.os-footer{
  padding:12px 18px;
  border-radius:8px;border:1px dashed var(--g300);
  background:var(--g50);
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
}
.os-footer-label{
  display:flex;align-items:center;gap:6px;
  font-size:13px;color:var(--g500);flex:1;min-width:0;
}
.os-footer-change{
  font-size:12px;color:var(--g500);cursor:pointer;
  padding:3px 10px;border-radius:6px;white-space:nowrap;
  border:1px solid var(--g300);background:#fff;
  transition:all .15s;
}
.os-footer-change:hover{color:var(--blue);border-color:var(--blue);background:var(--blue-l)}

/* ===== OS 选择器 ===== */
.os-picker{
  display:none;flex-wrap:wrap;gap:8px;
  width:100%;margin-top:8px;
  animation:fadeDown .15s ease;
}
.os-picker.open{display:flex}
.os-picker button{
  padding:7px 14px;border-radius:8px;
  border:1.5px solid var(--g200);background:#fff;
  color:var(--g700);font-size:13px;cursor:pointer;font-weight:500;
  transition:all .15s;
}
.os-picker button:hover,.os-picker button.active{
  border-color:var(--blue);color:var(--blue);background:var(--blue-l)
}
@keyframes fadeDown{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:translateY(0)}}

/* ===== 工具卡片网格（并排，撑满剩余空间）===== */
.tools-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:20px;
  flex:1;
  min-height:0;
  align-items:stretch;
}

.tool-card{
  background:#fff;border-radius:var(--r);
  border:1.5px solid var(--g200);box-shadow:var(--sh);
  overflow:hidden;transition:box-shadow .2s,transform .2s;
  position:relative;
  display:flex;flex-direction:column;
  height:100%;
}
.tool-card:hover{box-shadow:var(--sh-lg);transform:translateY(-3px)}
.tool-card.rank-1{border-color:var(--blue);box-shadow:0 0 0 3px rgba(37,99,235,.12),var(--sh-lg)}

/* 推荐标签 */
.tool-badge{
  position:absolute;top:0;left:50%;transform:translateX(-50%);
  background:linear-gradient(90deg,#2563eb,#3b82f6);
  color:#fff;font-size:11px;font-weight:700;
  padding:3px 14px 4px;border-radius:0 0 8px 8px;
  letter-spacing:.04em;white-space:nowrap;
}

.tool-body{
  display:flex;flex-direction:column;align-items:center;
  gap:16px;padding:36px 24px 20px;text-align:center;
  flex:1;
  justify-content:center;
}
.tool-body.has-badge{padding-top:44px}

/* 工具 Logo */
.tool-logo-wrap{
  width:80px;height:80px;border-radius:20px;
  background:var(--g50);border:1px solid var(--g200);
  display:flex;align-items:center;justify-content:center;
  flex-shrink:0;overflow:hidden;
}
.tool-logo-wrap img{width:56px;height:56px;object-fit:contain}
.tool-logo-wrap .logo-text{font-size:20px;font-weight:800;color:var(--g700);letter-spacing:-.5px}

.tool-name{font-size:18px;font-weight:700;color:var(--g900)}
.tool-compat{font-size:12px;color:var(--g500);line-height:1.7;max-width:220px}

/* 不兼容警告 */
.tool-warn{
  font-size:11px;color:var(--warn);
  background:var(--warn-l);border-radius:6px;padding:4px 8px;
  display:inline-flex;align-items:center;gap:4px;
}

/* 下载按钮区 */
.tool-actions{
  padding:0 20px 20px;
  display:flex;align-items:stretch;
}

.btn-dl{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 20px;border-radius:8px;border:none;cursor:pointer;
  font-size:14px;font-weight:700;transition:all .2s;line-height:1;
  background:var(--blue);color:#fff;flex:1;
}
.btn-dl:hover{background:var(--blue-d);transform:translateY(-1px);box-shadow:0 4px 12px rgba(37,99,235,.4)}
.btn-dl.alt{background:#fff;color:var(--blue);border:2px solid var(--blue);font-weight:600;font-size:13px}
.btn-dl.alt:hover{background:var(--blue-l)}

/* 标签 */
.tag{
  display:inline-block;font-size:11px;font-weight:600;
  padding:3px 8px;border-radius:4px;
}
.tag-g{background:var(--green-l);color:var(--green)}
.tag-b{background:var(--blue-l);color:var(--blue)}
.tag-w{background:var(--warn-l);color:var(--warn)}
.tags{display:flex;flex-wrap:wrap;gap:5px;margin-bottom:8px}

/* ===== 底部联系 ===== */
.bottom-service{
  text-align:center;
  font-size:14px;color:var(--g500);
  display:flex;align-items:center;justify-content:center;gap:12px;flex-wrap:wrap;
}
.wechat-btn{
  display:inline-flex;align-items:center;gap:6px;
  padding:8px 18px;border-radius:20px;border:none;cursor:pointer;
  background:#07c160;color:#fff;font-size:14px;font-weight:600;
  transition:all .15s;
}
.wechat-btn:hover{background:#06ad56;transform:scale(1.03)}

/* ===== 弹层（下载中 + 教程） ===== */
.modal-mask{
  display:none;position:fixed;inset:0;
  background:rgba(0,0,0,.5);z-index:300;
  animation:fadeIn .2s ease;
}
.modal-mask.open{display:block}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}

.modal{
  display:none;position:fixed;
  top:50%;left:50%;transform:translate(-50%,-50%) scale(.96);
  z-index:301;width:min(780px,96vw);max-height:90vh;
  background:#fff;border-radius:16px;box-shadow:var(--sh-xl);
  overflow:hidden;flex-direction:column;
  animation:popIn .2s ease forwards;
}
.modal.open{display:flex}
@keyframes popIn{from{opacity:0;transform:translate(-50%,-50%) scale(.94)}to{opacity:1;transform:translate(-50%,-50%) scale(1)}}

.modal-close{
  position:absolute;top:14px;right:16px;
  width:32px;height:32px;border-radius:50%;border:none;
  background:var(--g100);color:var(--g700);
  font-size:16px;cursor:pointer;display:flex;align-items:center;justify-content:center;
  transition:all .15s;z-index:1;
}
.modal-close:hover{background:var(--g200)}

.modal-inner{overflow-y:auto;max-height:90vh;padding:28px 28px 32px}

/* 弹层内容 */
.dl-header{display:flex;align-items:center;gap:14px;margin-bottom:20px;padding-right:28px}
.dl-logo{
  width:60px;height:60px;border-radius:14px;
  background:var(--g50);border:1px solid var(--g200);
  display:flex;align-items:center;justify-content:center;flex-shrink:0;overflow:hidden;
}
.dl-logo img{width:46px;height:46px;object-fit:contain}
.dl-logo .logo-text{font-size:18px;font-weight:800;color:var(--g700)}
.dl-title{font-size:22px;font-weight:800;color:var(--g900)}
.dl-sub{font-size:13px;color:var(--g500);margin-top:2px}

.dl-status{
  background:var(--green-l);border:1px solid #86efac;border-radius:10px;
  padding:14px 18px;display:flex;align-items:center;gap:10px;
  font-size:14px;color:var(--green);font-weight:600;margin-bottom:24px;
}
.dl-status-alt{
  background:var(--blue-l);border:1px solid #93c5fd;border-radius:10px;
  padding:14px 18px;display:flex;align-items:center;gap:10px;
  font-size:14px;color:var(--blue);font-weight:600;margin-bottom:24px;
}

.tutorial-title{font-size:16px;font-weight:700;color:var(--g900);margin-bottom:16px;padding-bottom:10px;border-bottom:1px solid var(--g100)}

/* 教程步骤 */
.steps{display:flex;flex-direction:column}
.step{display:flex;gap:14px;padding:16px 0;border-bottom:1px solid var(--g100)}
.step:last-child{border-bottom:none}
.step-n{
  width:28px;height:28px;border-radius:50%;background:var(--blue);
  color:#fff;display:flex;align-items:center;justify-content:center;
  font-weight:700;font-size:13px;flex-shrink:0;margin-top:1px;
}
.step-body{}
.step-t{font-size:14px;font-weight:700;color:var(--g900);margin-bottom:4px}
.step-d{font-size:13px;color:var(--g500);line-height:1.65}
.step-d code{background:var(--g100);padding:2px 6px;border-radius:4px;font-family:monospace;font-size:12px;color:var(--g900)}
.step-d strong{color:var(--g700)}
.step-d a{color:var(--blue)}

.tip-warn{background:var(--warn-l);border:1px solid #fcd34d;border-radius:8px;padding:12px 16px;font-size:13px;color:var(--g700);margin:14px 0;display:flex;gap:8px}
.tip-ok{background:var(--green-l);border:1px solid #86efac;border-radius:8px;padding:12px 16px;font-size:13px;color:var(--g700);margin:14px 0;display:flex;gap:8px}
.tip-info{background:var(--blue-l);border:1px solid #93c5fd;border-radius:8px;padding:12px 16px;font-size:13px;color:var(--g700);margin:14px 0;display:flex;gap:8px}
.tip-icon{display:flex;align-items:center;flex-shrink:0;margin-top:1px}
.tip-icon-warn{color:var(--warn)}
.tip-icon-ok{color:var(--green)}
.tip-icon-info{color:var(--blue)}

/* 教程底部微信 */
.modal-wechat{
  margin-top:24px;border-top:1px solid var(--g100);padding-top:20px;
  display:flex;align-items:center;gap:14px;flex-wrap:wrap;
}
.modal-wechat-text{font-size:14px;color:var(--g500)}
.modal-wechat-text strong{color:var(--g900)}

/* ===== FAB ===== */
.fab{
  position:fixed;bottom:24px;right:20px;z-index:200;
  width:52px;height:52px;border-radius:50%;border:none;cursor:pointer;
  background:#07c160;display:flex;align-items:center;justify-content:center;
  box-shadow:0 4px 16px rgba(7,193,96,.5);transition:all .2s;
}
.fab:hover{transform:scale(1.08);background:#06ad56;box-shadow:0 6px 20px rgba(7,193,96,.6)}

/* ===== Toast ===== */
.toast{
  position:fixed;bottom:86px;left:50%;
  transform:translateX(-50%) translateY(10px);
  background:rgba(0,0,0,.82);color:#fff;
  padding:9px 22px;border-radius:22px;font-size:14px;
  pointer-events:none;opacity:0;transition:all .25s;z-index:500;white-space:nowrap;
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* ===== 响应式 ===== */
@media(max-width:640px){
  .tools-grid{grid-template-columns:1fr;gap:14px}
  .tool-body{padding:28px 20px 16px;gap:12px}
  .tool-body.has-badge{padding-top:36px}
  .tool-logo-wrap{width:64px;height:64px;border-radius:16px}
  .tool-logo-wrap img{width:44px;height:44px}
  .tool-name{font-size:16px}
  .modal-inner{padding:20px 16px 24px}
  .dl-header{gap:10px}
  .main{padding:20px 16px 32px;gap:16px}
}
@media(min-width:641px) and (max-width:920px){
  .tools-grid{grid-template-columns:repeat(2,1fr)}
}