/* ============================================================
   小维编程 · 长沙小维编程科技有限公司 官网样式
   风格：简约大气，留白克制
   ============================================================ */

:root{
  --ink:#0d1b2a;
  --ink-2:#16263b;
  --body:#4a5b72;
  --muted:#7a8aa3;
  --line:#e4e9f1;
  --line-2:#eef2f7;
  --paper:#f5f8fc;
  --white:#fff;

  --brand:#1f6ff0;
  --brand-deep:#0c4fc6;
  --brand-ink:#0a3a86;
  --brand-soft:#e9f1ff;

  --accent:#ff6a36;
  --accent-soft:#fff0e9;
  --scratch:#7c5cfc;
  --python:#1296db;
  --cpp:#f5702e;
  --green:#14a06c;
  --gold:#f5a623;

  --navy:#0b1f3a;
  --navy-2:#102c54;

  --radius:14px;
  --radius-lg:22px;
  --shadow-sm:0 1px 2px rgba(13,27,42,.05), 0 4px 14px rgba(13,27,42,.06);
  --shadow-md:0 10px 34px rgba(13,27,42,.10);
  --shadow-lg:0 26px 70px rgba(10,40,110,.18);

  --font-sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,Consolas,"Courier New",monospace;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--font-sans);
  color:var(--ink);
  background:var(--white);
  line-height:1.75;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
ul{list-style:none}
img{max-width:100%;display:block}
button{font-family:inherit}
input,select,textarea{font-family:inherit;font-size:15px}
:focus-visible{outline:2.5px solid var(--brand);outline-offset:2px;border-radius:6px}

.wrap{width:min(1180px,92vw);margin:0 auto}
.mono{font-family:var(--font-mono)}
section{scroll-margin-top:80px}
.hidden{display:none !important}

/* ---------------- 按钮 ---------------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  font-family:var(--font-sans);font-weight:700;font-size:15px;
  border-radius:11px;padding:13px 24px;cursor:pointer;
  border:1.5px solid transparent;
  transition:transform .18s ease,box-shadow .18s ease,background .18s ease,border-color .18s ease,color .18s ease;
  white-space:nowrap;line-height:1.2;
}
.btn svg{width:17px;height:17px;flex:none}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 8px 22px rgba(31,111,240,.28)}
.btn-primary:hover{background:var(--brand-deep);transform:translateY(-2px);box-shadow:0 12px 28px rgba(31,111,240,.34)}
.btn-accent{background:var(--accent);color:#fff;box-shadow:0 8px 22px rgba(255,106,54,.3)}
.btn-accent:hover{background:#e8511c;transform:translateY(-2px)}
.btn-line{background:#fff;color:var(--brand);border-color:var(--brand)}
.btn-line:hover{background:var(--brand-soft)}
.btn-dark{background:var(--ink);color:#fff}
.btn-dark:hover{background:#000;transform:translateY(-2px)}
.btn-ghost-light{background:transparent;color:#fff;border-color:rgba(255,255,255,.4)}
.btn-ghost-light:hover{background:rgba(255,255,255,.12);border-color:#fff}
.btn-sm{padding:9px 17px;font-size:14px;border-radius:9px}
.btn-block{width:100%}
.btn[disabled],.btn.is-loading{opacity:.62;cursor:not-allowed;transform:none !important}

/* ---------------- 导航 ---------------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  transition:background .25s,box-shadow .25s,border-color .25s;
  border-bottom:1px solid transparent;
}
.nav-inner{height:70px;display:flex;align-items:center;gap:26px}
.nav.scrolled{background:rgba(255,255,255,.93);backdrop-filter:blur(12px);border-bottom-color:var(--line);box-shadow:0 1px 0 rgba(13,27,42,.03)}
.brand{display:flex;align-items:center;gap:11px;font-weight:900;letter-spacing:-.01em;flex:none}
.brand .logo{
  width:38px;height:38px;border-radius:10px;
  background:linear-gradient(135deg,#2f86ff,#0c4fc6);
  display:grid;place-items:center;color:#fff;
  font-family:var(--font-mono);font-weight:700;font-size:14px;
  box-shadow:0 6px 16px rgba(31,111,240,.32);
}
.brand .bname{font-size:16.5px;line-height:1.15}
.brand .bname small{display:block;font-size:11px;font-weight:500;color:rgba(255,255,255,.72);letter-spacing:.02em}
.nav.scrolled .brand .bname small{color:var(--muted)}

.nav-links{display:flex;gap:26px;align-items:center}
.nav-links a{
  font-size:15px;font-weight:500;color:#cdd9ee;position:relative;padding:4px 0;
  transition:color .2s;
}
.nav.scrolled .nav-links a{color:var(--ink-2)}
.nav-links a::after{
  content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;
  background:currentColor;border-radius:2px;transform:scaleX(0);transition:transform .22s ease;
}
.nav-links a:hover::after,.nav-links a.active::after{transform:scaleX(1)}
.nav-links a.active{color:#fff}
.nav.scrolled .nav-links a.active{color:var(--brand)}

.nav-right{margin-left:auto;display:flex;align-items:center;gap:14px}
.nav-phone{font-family:var(--font-mono);font-size:14px;font-weight:500;color:#cdd9ee}
.nav.scrolled .nav-phone{color:var(--ink-2)}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;color:#fff;padding:4px}
.nav.scrolled .nav-toggle{color:var(--ink)}
.nav-toggle svg{width:26px;height:26px}

.user-chip{
  display:none;align-items:center;gap:9px;background:rgba(255,255,255,.14);
  border:1px solid rgba(255,255,255,.24);border-radius:100px;padding:6px 15px 6px 7px;
  color:#fff;font-size:14px;font-weight:600;cursor:pointer;max-width:190px;
}
.nav.scrolled .user-chip{background:var(--brand-soft);border-color:#d3e4ff;color:var(--brand)}
.user-chip.show{display:inline-flex}
.user-chip .ava{
  width:26px;height:26px;border-radius:50%;flex:none;
  background:linear-gradient(135deg,#5aa2ff,#1f6ff0);color:#fff;
  display:grid;place-items:center;font-size:12px;font-weight:700;
}
.user-chip .nm{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

.mobile-menu{
  display:none;position:fixed;top:70px;left:0;right:0;z-index:99;
  background:#fff;border-bottom:1px solid var(--line);
  box-shadow:var(--shadow-md);padding:10px 4vw 20px;
}
.mobile-menu.open{display:block}
.mobile-menu a{display:block;padding:13px 6px;font-size:16px;font-weight:500;border-bottom:1px solid var(--line-2)}
.mobile-menu .btn{margin-top:14px;justify-content:center;width:100%}

/* ---------------- 区块标题 ---------------- */
.sec{padding:88px 0}
.sec.tight{padding:64px 0}
.sec.paper{background:var(--paper)}
.sec-head{max-width:760px;margin-bottom:52px}
.sec-head.center{margin-left:auto;margin-right:auto;text-align:center}
.kicker{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:13px;font-weight:500;
  color:var(--brand);letter-spacing:.04em;margin-bottom:16px;
}
.kicker::before{content:"";width:22px;height:2px;background:var(--brand);border-radius:2px}
.sec-head.center .kicker{justify-content:center}
.sec-title{font-size:clamp(26px,3.3vw,40px);font-weight:900;line-height:1.28;letter-spacing:-.01em}
.sec-sub{margin-top:16px;color:var(--body);font-size:17px;line-height:1.85}

/* ---------------- 页头（内页） ---------------- */
.page-head{
  position:relative;overflow:hidden;
  background:linear-gradient(160deg,#0a2f6e 0%,#0d3c8c 46%,#1048a8 100%);
  color:#fff;padding:132px 0 76px;
}
.page-head::before{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:44px 44px;
  mask-image:radial-gradient(ellipse 80% 70% at 30% 20%,#000 30%,transparent 75%);
}
.page-head::after{
  content:"";position:absolute;width:480px;height:480px;border-radius:50%;
  background:radial-gradient(circle,rgba(124,92,252,.3),transparent 65%);
  right:-130px;top:-140px;
}
.page-head .wrap{position:relative;z-index:2}
.crumb{font-size:14px;color:#b9cdf0;margin-bottom:18px;display:flex;gap:9px;align-items:center;flex-wrap:wrap}
.crumb a:hover{color:#fff}
.page-head h1{font-size:clamp(29px,4vw,46px);font-weight:900;line-height:1.22;letter-spacing:-.015em}
.page-head .lead{margin-top:18px;font-size:17.5px;line-height:1.85;color:#d4e2fb;max-width:680px}

/* ---------------- 通用卡片 ---------------- */
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 24px;transition:transform .2s,box-shadow .2s,border-color .2s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:#cfdcee}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}

.ico{width:44px;height:44px;border-radius:12px;display:grid;place-items:center;margin-bottom:14px}
.ico svg{width:23px;height:23px}
.ico.c1{background:#f0ecff;color:var(--scratch)}
.ico.c2{background:#e5f4fc;color:var(--python)}
.ico.c3{background:#fff0e8;color:var(--cpp)}
.ico.c4{background:#e7f7f0;color:var(--green)}
.ico.c5{background:var(--brand-soft);color:var(--brand)}
.ico.c6{background:#fdf3e2;color:var(--gold)}
.ico.c7{background:#fdeeee;color:#e05252}
.ico.c8{background:#eef0f4;color:#56607a}
.ico.accent{background:var(--accent-soft);color:var(--accent)}

/* ---------------- 页脚 ---------------- */
.footer{background:var(--navy);color:#9fb2d0;padding:64px 0 0}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.35fr;gap:40px;padding-bottom:44px}
.footer h4{color:#fff;font-size:15.5px;font-weight:700;margin-bottom:16px}
.footer li{font-size:14px;margin-bottom:10px;line-height:1.7}
.footer li a{transition:color .18s}
.footer li a:hover{color:#fff}
.footer .f-about{font-size:14px;line-height:1.85;margin-top:16px;max-width:330px}
.footer .logo-line{display:flex;align-items:center;gap:11px;font-weight:900;color:#fff;font-size:16.5px}
.footer .logo-mark{width:36px;height:36px;border-radius:10px;background:linear-gradient(135deg,#2f86ff,#0c4fc6);display:grid;place-items:center;font-family:var(--font-mono);font-size:13px}
.footer-contact li{display:flex;gap:10px;align-items:flex-start}
.footer-contact svg{width:16px;height:16px;color:#6ea8ff;flex:none;margin-top:4px}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.1);padding:20px 0;
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13px;color:#7f93b4;
}

/* ---------------- 表单 ---------------- */
.field{margin-bottom:18px}
.field label{display:block;font-size:14px;font-weight:700;color:var(--ink-2);margin-bottom:8px}
.field label .req{color:var(--accent);margin-left:3px}
.field .hint{font-size:12.5px;color:var(--muted);margin-top:7px;line-height:1.6}
.field .err{font-size:13px;color:#e05252;margin-top:7px;display:none}
.field .err.show{display:block}
.control{
  width:100%;border:1.5px solid var(--line);border-radius:11px;
  padding:12px 14px;background:#fff;color:var(--ink);
  transition:border-color .18s,box-shadow .18s;
}
.control::placeholder{color:#a9b6c9}
.control:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3.5px rgba(31,111,240,.13)}
.control.invalid{border-color:#e05252}
textarea.control{resize:vertical;min-height:118px;line-height:1.7}
select.control{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%237a8aa3' stroke-width='2.2' stroke-linecap='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 13px center;background-size:17px;padding-right:42px;cursor:pointer}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}

/* ---------------- 提示条 ---------------- */
.alert{
  display:none;align-items:flex-start;gap:11px;
  border-radius:12px;padding:14px 16px;font-size:14.5px;line-height:1.65;margin-bottom:20px;
}
.alert.show{display:flex}
.alert svg{width:19px;height:19px;flex:none;margin-top:2px}
.alert-info{background:var(--brand-soft);color:var(--brand-ink);border:1px solid #d3e4ff}
.alert-ok{background:#e7f7f0;color:#0b6e49;border:1px solid #bde8d5}
.alert-err{background:#fdeeee;color:#b13a3a;border:1px solid #f6cdcd}
.alert-warn{background:#fdf3e2;color:#8a5a10;border:1px solid #f5e0b3}

/* ---------------- Toast ---------------- */
.toast-host{position:fixed;top:88px;right:22px;z-index:300;display:flex;flex-direction:column;gap:11px;pointer-events:none}
.toast{
  background:var(--ink);color:#fff;border-radius:12px;
  padding:14px 19px;font-size:14.5px;box-shadow:var(--shadow-md);
  display:flex;align-items:center;gap:10px;max-width:380px;
  animation:toastIn .3s ease;line-height:1.6;
}
.toast svg{width:18px;height:18px;flex:none}
.toast.ok svg{color:#54d8a3}
.toast.err svg{color:#ff8a7a}
.toast.hide{animation:toastOut .25s ease forwards}
@keyframes toastIn{from{opacity:0;transform:translateX(26px)}to{opacity:1;transform:none}}
@keyframes toastOut{to{opacity:0;transform:translateX(26px)}}

/* ---------------- 模态框 ---------------- */
.modal-back{
  position:fixed;inset:0;z-index:400;background:rgba(8,22,44,.6);
  backdrop-filter:blur(5px);display:none;align-items:center;justify-content:center;padding:22px;
}
.modal-back.open{display:flex}
.modal{
  background:#fff;border-radius:20px;width:min(520px,100%);
  max-height:88vh;overflow-y:auto;box-shadow:var(--shadow-lg);
  animation:modalIn .28s ease;
}
.modal.wide{width:min(880px,100%)}
@keyframes modalIn{from{opacity:0;transform:translateY(18px) scale(.98)}to{opacity:1;transform:none}}
.modal-head{padding:26px 28px 0;display:flex;align-items:flex-start;gap:14px}
.modal-head h3{font-size:21px;font-weight:800;line-height:1.35}
.modal-head .sub{font-size:14px;color:var(--muted);margin-top:6px}
.modal-close{
  margin-left:auto;background:var(--paper);border:0;width:32px;height:32px;border-radius:9px;
  cursor:pointer;color:var(--muted);display:grid;place-items:center;flex:none;transition:background .18s,color .18s;
}
.modal-close:hover{background:var(--line-2);color:var(--ink)}
.modal-close svg{width:17px;height:17px}
.modal-body{padding:24px 28px 28px}

/* ---------------- 模态内 Tabs ---------------- */
.tabs{display:flex;gap:6px;background:var(--paper);border:1px solid var(--line);padding:6px;border-radius:13px;margin-bottom:24px}
.tabs button{
  flex:1;border:0;background:transparent;cursor:pointer;
  font-family:inherit;font-size:15px;font-weight:700;color:var(--muted);
  padding:11px 14px;border-radius:9px;transition:all .2s;
}
.tabs button.active{background:#fff;color:var(--brand);box-shadow:var(--shadow-sm)}

/* ---------------- 空状态 / 加载 ---------------- */
.empty{text-align:center;padding:46px 20px;color:var(--muted)}
.empty svg{width:46px;height:46px;color:var(--line);margin:0 auto 14px}
.empty p{font-size:14.5px;line-height:1.7}
.skeleton{background:linear-gradient(90deg,#eef2f7 25%,#f6f9fc 50%,#eef2f7 75%);background-size:200% 100%;animation:sk 1.4s infinite;border-radius:8px}
@keyframes sk{0%{background-position:200% 0}100%{background-position:-200% 0}}
.spinner{
  width:15px;height:15px;border:2.2px solid rgba(255,255,255,.35);
  border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite;
}
.btn-line .spinner,.btn:not(.btn-primary):not(.btn-accent):not(.btn-dark) .spinner{border-color:rgba(31,111,240,.3);border-top-color:var(--brand)}
@keyframes spin{to{transform:rotate(360deg)}}

/* ---------------- 验证码行 ---------------- */
.code-row{display:flex;gap:11px}
.code-row .control{flex:1}
.code-row .btn{flex:none;padding-left:20px;padding-right:20px}

/* ---------------- 页脚 CTA ---------------- */
.cta-band{background:linear-gradient(115deg,#0a2f6e,#1048a8);color:#fff;position:relative;overflow:hidden}
.cta-band::after{
  content:"";position:absolute;width:420px;height:420px;border-radius:50%;
  background:radial-gradient(circle,rgba(124,92,252,.3),transparent 65%);right:-110px;bottom:-180px;
}
.cta-inner{position:relative;z-index:2;display:flex;justify-content:space-between;align-items:center;gap:34px;flex-wrap:wrap;padding:56px 0}
.cta-inner h2{font-size:clamp(23px,2.8vw,32px);font-weight:900;line-height:1.32;max-width:600px}
.cta-inner p{margin-top:13px;color:#c3d5f2;font-size:16px;max-width:560px;line-height:1.8}
.cta-actions{display:flex;gap:13px;flex-wrap:wrap}

/* ---------------- 滚动出现动画 ---------------- */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}

/* ---------------- 响应式 ---------------- */
@media (max-width:1000px){
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr;gap:34px}
}
@media (max-width:860px){
  .nav-links,.nav-phone{display:none}
  .nav-toggle{display:block}
  .nav-inner{justify-content:space-between}
  .sec{padding:62px 0}
  .sec-head{margin-bottom:36px}
  .grid-3,.grid-2{grid-template-columns:1fr}
  .form-row{grid-template-columns:1fr}
  .cta-inner{padding:44px 0}
  .page-head{padding:112px 0 58px}
}
@media (max-width:560px){
  .grid-4{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .modal-head,.modal-body{padding-left:20px;padding-right:20px}
  .code-row{flex-direction:column}
  .code-row .btn{width:100%}
  .toast-host{left:16px;right:16px;top:80px}
  .toast{max-width:100%}
}

@media (prefers-reduced-motion:reduce){
  *{animation-duration:.01ms !important;transition-duration:.01ms !important}
  .reveal{opacity:1;transform:none}
  html{scroll-behavior:auto}
}

/* 备案信息链接（与 footer-bottom 同色，13px 继承） */
.footer-bottom .beian-links{display:inline-flex;align-items:center;gap:8px;flex-wrap:wrap}
.footer-bottom .beian-links a{color:#7f93b4;text-decoration:none;transition:color .15s}
.footer-bottom .beian-links a:hover{color:#a9bfe0;text-decoration:underline}