/* ===========================================================
   components.css — 全站通用组件
   导航 / 按钮 / 卡片 / 徽章 / 上传区 / 表单 / 页脚
   明亮科技风格 · 白底 + 柔和阴影 + 电蓝强调
   =========================================================== */

/* ---------- 顶部导航 ---------- */
.site-nav{
  position:sticky;top:0;z-index:50;
  background:rgba(244, 247, 252, 0.82);
  backdrop-filter:blur(16px) saturate(160%);
  -webkit-backdrop-filter:blur(16px) saturate(160%);
  border-bottom:1px solid var(--line);
}
.site-nav::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;
  background:linear-gradient(90deg,transparent,var(--accent) 50%,transparent);
  opacity:.5;
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px;gap:20px}
.brand{display:flex;align-items:center;gap:12px;font-family:var(--display);font-weight:700;font-size:1.05rem;letter-spacing:.04em}
.brand .mark{
  width:38px;height:38px;border-radius:9px;flex:none;
  background:linear-gradient(135deg,var(--accent) 0%,var(--neon) 100%);
  color:#FFFFFF;
  display:grid;place-items:center;font-family:var(--display);font-size:.95rem;font-weight:900;
  box-shadow:var(--glow-accent), inset 0 0 0 1px rgba(255,255,255,.3);
  position:relative;
}
.brand .mark::after{content:"";position:absolute;inset:2px;border-radius:7px;border:1px solid rgba(255,255,255,.25)}
.brand .mark span{color:#FFFFFF;position:relative;z-index:1}
.brand small{display:block;font-family:var(--mono);font-weight:500;font-size:.62rem;letter-spacing:.3em;color:var(--muted);text-transform:uppercase;margin-top:2px}
.nav-links{display:flex;align-items:center;gap:4px}
.nav-links a{
  padding:8px 14px;border-radius:var(--r-sm);font-size:.88rem;font-weight:600;color:var(--ink-soft);
  font-family:var(--mono);letter-spacing:.04em;
  transition:all .2s;position:relative;
}
.nav-links a:hover{color:var(--accent);background:var(--accent-soft)}
.nav-links a.active{color:var(--accent);background:var(--accent-soft);box-shadow:inset 0 0 0 1px var(--line-strong)}
.nav-links a.active::before{content:"›";margin-right:6px;color:var(--neon)}
.nav-cta{
  display:inline-flex;align-items:center;gap:8px;padding:9px 18px;border-radius:var(--r-pill);
  background:linear-gradient(135deg,var(--accent) 0%,var(--accent-deep) 100%);
  color:#FFFFFF;font-weight:700;font-size:.86rem;font-family:var(--mono);letter-spacing:.06em;
  box-shadow:var(--glow-accent);transition:all .2s;text-transform:uppercase;
}
.nav-cta:hover{box-shadow:0 12px 28px rgba(0,102,255,.32);transform:translateY(-1px)}
.nav-toggle{display:none;width:42px;height:42px;border:1px solid var(--line-strong);background:var(--surface);border-radius:9px;align-items:center;justify-content:center;backdrop-filter:blur(8px)}
.nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{content:"";display:block;width:18px;height:2px;background:var(--accent);border-radius:2px;transition:.25s}
.nav-toggle span::before{transform:translateY(-6px)}
.nav-toggle span::after{transform:translateY(4px)}
.nav-toggle[aria-expanded="true"] span{background:transparent}
.nav-toggle[aria-expanded="true"] span::before{transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] span::after{transform:rotate(-45deg)}

@media (max-width:860px){
  .nav-toggle{display:inline-flex}
  .nav-links{
    position:fixed;left:0;right:0;top:64px;
    flex-direction:column;align-items:stretch;gap:0;
    background:rgba(244,247,252,.97);backdrop-filter:blur(20px);
    border-bottom:1px solid var(--line-strong);
    padding:8px var(--gutter) 18px;max-height:0;overflow:hidden;transition:max-height .3s ease;
  }
  .nav-links.open{max-height:380px}
  .nav-links a{padding:13px 14px;border-radius:8px;font-size:.95rem}
  .nav-links a+a{margin-top:2px}
  .nav-cta{margin-top:8px;justify-content:center}
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  padding:13px 24px;border-radius:var(--r-sm);font-weight:700;font-size:.92rem;font-family:var(--mono);letter-spacing:.04em;
  border:1px solid transparent;transition:all .22s;
  min-height:46px;white-space:nowrap;line-height:1;position:relative;overflow:hidden;
  text-transform:uppercase;
}
.btn svg{width:18px;height:18px}
.btn-primary{
  background:linear-gradient(135deg,var(--accent) 0%,var(--accent-deep) 100%);
  color:#FFFFFF;
  box-shadow:var(--glow-accent), inset 0 1px 0 rgba(255,255,255,.25);
}
.btn-primary:hover{box-shadow:0 14px 32px rgba(0,102,255,.32), inset 0 1px 0 rgba(255,255,255,.25);transform:translateY(-2px)}
.btn-primary::before{
  content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;
  background:linear-gradient(90deg,transparent,rgba(255,255,255,.35),transparent);
  transition:left .6s;
}
.btn-primary:hover::before{left:100%}
.btn-ghost{background:var(--surface);color:var(--ink);border-color:var(--line-strong);box-shadow:var(--shadow-sm)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent);box-shadow:var(--glow-accent);transform:translateY(-2px)}
.btn-neon{background:transparent;color:var(--neon-deep);border-color:var(--neon);box-shadow:inset 0 0 0 1px var(--neon-soft)}
.btn-neon:hover{background:var(--neon);color:#FFFFFF;box-shadow:var(--glow-neon)}
.btn-lg{padding:16px 30px;font-size:.98rem;min-height:54px}
.btn-sm{padding:9px 16px;font-size:.78rem;min-height:38px}
.btn[disabled]{opacity:.4;cursor:not-allowed;transform:none!important;box-shadow:none;filter:grayscale(.4)}

/* ---------- 徽章 / 标签 ---------- */
.badge{
  display:inline-flex;align-items:center;gap:7px;padding:7px 15px;border-radius:var(--r-pill);
  font-size:.78rem;font-weight:600;background:var(--surface);border:1px solid var(--line-strong);color:var(--ink-soft);
  font-family:var(--mono);letter-spacing:.04em;backdrop-filter:blur(8px);box-shadow:var(--shadow-sm);
}
.badge .dot{width:7px;height:7px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.badge.neon{background:var(--neon-soft);border-color:var(--neon);color:var(--neon-deep)}
.badge.neon .dot{background:var(--neon);box-shadow:0 0 0 3px var(--neon-soft)}
.badge.magenta{background:rgba(225,29,110,.08);border-color:var(--magenta);color:var(--magenta)}
.badge.magenta .dot{background:var(--magenta);box-shadow:0 0 0 3px rgba(225,29,110,.12)}
.tag{display:inline-flex;align-items:center;padding:4px 11px;border-radius:5px;font-family:var(--mono);font-size:.72rem;font-weight:600;letter-spacing:.06em;background:var(--surface-sunk);color:var(--ink-soft);border:1px solid var(--line)}
.tag.pdf{background:var(--accent-soft);color:var(--accent);border-color:var(--line-strong)}
.tag.img{background:var(--neon-soft);color:var(--neon-deep);border-color:rgba(6,182,212,.3)}

/* ---------- 工具卡片 ---------- */
.tool-card{
  position:relative;display:flex;flex-direction:column;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:28px 26px 24px;overflow:hidden;
  box-shadow:var(--shadow-sm);
  transition:all .3s cubic-bezier(.2,.7,.2,1);
}
.tool-card::before{
  content:"";position:absolute;top:0;left:0;right:0;height:2px;
  background:linear-gradient(90deg,transparent,var(--accent),transparent);
  opacity:0;transition:opacity .3s;
}
.tool-card::after{
  content:"";position:absolute;top:0;left:50%;transform:translateX(-50%);
  width:60%;height:2px;background:var(--accent);
  box-shadow:0 0 12px var(--accent-glow);opacity:0;transition:opacity .3s;
}
.tool-card:hover{transform:translateY(-6px);border-color:var(--line-strong);box-shadow:var(--shadow-lg)}
.tool-card:hover::before,.tool-card:hover::after{opacity:1}
.tool-card .ico{
  width:54px;height:54px;border-radius:11px;display:grid;place-items:center;margin-bottom:18px;
  background:var(--accent-soft);border:1px solid var(--line-strong);color:var(--accent);
  position:relative;
}
.tool-card .ico::before{content:"";position:absolute;inset:-1px;border-radius:11px;background:linear-gradient(135deg,var(--accent),transparent);opacity:.12;z-index:-1}
.tool-card .ico svg{width:26px;height:26px}
.tool-card.pdf .ico{color:var(--accent);background:var(--accent-soft)}
.tool-card.img .ico{color:var(--neon-deep);background:var(--neon-soft)}
.tool-card.img .ico::before{background:linear-gradient(135deg,var(--neon),transparent)}
.tool-card h3{font-size:1.2rem;margin-bottom:6px;font-family:var(--display);letter-spacing:.02em}
.tool-card p{color:var(--muted);font-size:.9rem;line-height:1.65;flex:1}
.tool-card .meta{display:flex;align-items:center;gap:8px;margin-top:18px;padding-top:16px;border-top:1px dashed var(--line-strong)}
.tool-card .go{margin-left:auto;display:inline-flex;align-items:center;gap:6px;font-weight:700;font-size:.82rem;color:var(--accent);font-family:var(--mono);letter-spacing:.06em;transition:gap .2s}
.tool-card:hover .go{gap:11px}

/* 小尺寸工具卡片 */
.tool-card.sm{
  padding:16px 18px 14px;
}
.tool-card.sm h4{
  font-family:var(--display);
  font-size:1rem;
  font-weight:700;
  letter-spacing:.02em;
  margin-bottom:10px;
}
.tool-card.sm .meta{
  margin-top:0;
  padding-top:12px;
  border-top:1px dashed var(--line-strong);
}
.tool-card.sm .go.sm{
  font-size:.74rem;
}
.tool-card.sm .tag.sm{
  padding:2px 8px;
  font-size:.66rem;
}
.tool-card.sm::before{height:1.5px}
.tool-card.sm::after{height:1.5px}
.tool-card.sm:hover{transform:translateY(-4px)}

/* 四列网格 */
.grid.four{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:12px;
}
@media (max-width:900px){
  .grid.four{grid-template-columns:repeat(3,1fr)}
}
@media (max-width:600px){
  .grid.four{grid-template-columns:repeat(2,1fr)}
}

/* ---------- 页脚 ---------- */
.site-footer{margin-top:80px;border-top:1px solid var(--line);background:var(--bg-deep);position:relative}
.site-footer::before{content:"";position:absolute;top:-1px;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent,var(--neon) 50%,transparent);opacity:.5}
.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;padding:34px 0}
.footer-inner .brand{font-size:1.02rem}
.footer-meta{color:var(--muted);font-size:.82rem;display:flex;gap:18px;flex-wrap:wrap;align-items:center;font-family:var(--mono)}
.footer-meta a:hover{color:var(--accent)}
.privacy-pill{display:inline-flex;align-items:center;gap:8px;color:var(--neon-deep);font-weight:600;font-size:.8rem;letter-spacing:.04em}

/* ---------- 提示条 / 通知 ---------- */
.notice{
  display:flex;align-items:flex-start;gap:12px;padding:14px 16px;border-radius:var(--r);
  font-size:.88rem;line-height:1.6;border:1px solid var(--line);background:var(--surface-sunk);
  font-family:var(--mono);
}
.notice svg{width:20px;height:20px;flex:none;margin-top:1px}
.notice.info{background:var(--accent-soft);border-color:var(--line-strong);color:var(--accent-deep)}
.notice.warn{background:rgba(217,119,6,.08);border-color:rgba(217,119,6,.4);color:var(--amber)}
.notice.error{background:rgba(225,29,110,.08);border-color:var(--magenta);color:var(--magenta)}

/* ---------- 进度条 ---------- */
.progress{height:8px;border-radius:99px;background:var(--surface-sunk);overflow:hidden;border:1px solid var(--line);position:relative}
.progress > i{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--accent),var(--neon));
  border-radius:99px;transition:width .25s ease;
  box-shadow:0 0 8px var(--accent-glow);
  position:relative;
}
.progress > i::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(90deg,transparent,rgba(255,255,255,.5),transparent);
  animation:scan 1.6s linear infinite;
}