/* ============================================================
   星球小捕手 PDF 工具箱 — 全局设计系统 theme.css
   ------------------------------------------------------------
   单例真源：所有页面统一 <link rel="stylesheet" href="theme.css">
   层级：tokens(设计令牌) → reset → typography → layout → components
   风格：浅色专业可信（参考 Smallpdf / iLovePDF），去霓虹去星空
   ============================================================ */

/* ========== 1. 设计令牌 ========== */
:root{
  /* 品牌主色 —— 蓝色系，传达"专业/可信/技术" */
  --brand-50:#eff6ff;
  --brand-100:#dbeafe;
  --brand-200:#bfdbfe;
  --brand-300:#93c5fd;
  --brand-400:#60a5fa;
  --brand-500:#3b82f6;
  --brand-600:#2563eb;   /* 主色 */
  --brand-700:#1d4ed8;   /* 深主色（hover/渐变尾） */
  --brand-800:#1e40af;
  --brand-900:#1e3a8a;

  /* 功能色 */
  --cyan:#0ea5e9;
  --green:#16a34a;
  --green-soft:#dcfce7;
  --amber:#f59e0b;
  --amber-soft:#fef3c7;
  --rose:#e11d48;
  --rose-soft:#ffe4e6;

  /* 中性色（文字/边框/背景） */
  --text:#0f172a;
  --text-dim:#475569;
  --text-faint:#94a3b8;
  --border:#e5e9f1;
  --border-bright:#cbd5e1;
  --bg-deep:#f5f7fb;
  --bg-card:#ffffff;
  --bg-card-hover:#ffffff;
  --bg-soft:#f8fafc;

  /* 渐变 */
  --grad-brand:linear-gradient(135deg,var(--brand-700),var(--brand-600));
  --grad-brand-soft:linear-gradient(135deg,rgba(29,78,216,0.15),rgba(14,165,233,0.1));
  --grad-text:linear-gradient(90deg,#2563eb,#4f46e5);

  /* 圆角 */
  --radius:18px;
  --radius-sm:12px;
  --radius-lg:28px;

  /* 阴影 */
  --shadow:0 1px 3px rgba(15,23,42,0.06),0 6px 20px rgba(15,23,42,0.06);
  --shadow-md:0 4px 12px rgba(15,23,42,0.08);
  --shadow-glow:0 8px 30px rgba(37,99,235,0.14);
  --shadow-btn:0 4px 16px rgba(29,78,216,0.35);
  --shadow-btn-hover:0 6px 22px rgba(29,78,216,0.5);

  /* 尺寸 */
  --nav-h:72px;
  --maxw:1100px;
  --maxw-nav:1200px;

  /* 动效 */
  --ease:cubic-bezier(0.25,0.46,0.45,0.94);
  --t-fast:0.2s;
  --t:0.3s;
  --t-slow:0.35s;

  /* 兼容旧变量名（各页内联样式/JS 仍在用） */
  --purple:var(--brand-600);
  --purple-light:var(--brand-600);
  --purple-deep:var(--brand-700);
  --blue:var(--brand-600);
  --pink:var(--rose);
}

/* ========== 2. Reset & 基础 ========== */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei","Helvetica Neue",sans-serif;
  background:var(--bg-deep);
  color:var(--text);
  line-height:1.6;
  overflow-x:hidden;
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
img{max-width:100%;height:auto;display:block}
a{color:inherit}

/* 旧星空装饰已废弃 —— 强制隐藏（不删 DOM，零风险） */
.starfield,.stars,.star{display:none!important}

/* 键盘可达性：统一焦点环 */
a:focus-visible,button:focus-visible,input:focus-visible,
summary:focus-visible,select:focus-visible{
  outline:2px solid var(--brand-500);
  outline-offset:2px;
  border-radius:4px;
}

/* ========== 3. 排版 ========== */
.grad{background:var(--grad-text);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}

/* ========== 4. 导航 ========== */
.nav{
  position:fixed;top:0;left:0;width:100%;z-index:100;
  padding:16px 0;
  background:rgba(255,255,255,0.8);
  backdrop-filter:saturate(180%) blur(20px);
  -webkit-backdrop-filter:saturate(180%) blur(20px);
  border-bottom:1px solid var(--border);
  transition:padding var(--t),box-shadow var(--t),background var(--t);
}
.nav.scrolled{padding:10px 0;box-shadow:0 1px 12px rgba(15,23,42,0.06);background:rgba(255,255,255,0.92)}
.nav-inner{max-width:var(--maxw-nav);margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.logo{display:flex;align-items:center;gap:12px;font-size:20px;font-weight:800;color:var(--text);text-decoration:none;flex-shrink:0}
.logo-icon{
  width:38px;height:38px;border-radius:50%;
  overflow:hidden;display:flex;align-items:center;justify-content:center;
  box-shadow:0 2px 10px rgba(37,99,235,0.25);position:relative;
}
.logo-text{background:var(--grad-text);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;white-space:nowrap}

/* 导航链接：默认隐藏"次要"，用"更多"下拉收纳 —— 解决 11 链接无层级问题 */
.nav-links{display:flex;gap:6px;align-items:center}
.nav-links a,.nav-drop-btn{
  color:var(--text-dim);text-decoration:none;font-size:15px;font-weight:500;
  padding:8px 12px;border-radius:10px;transition:all var(--t-fast);
  display:inline-flex;align-items:center;gap:6px;white-space:nowrap;cursor:pointer;
  background:none;border:none;font-family:inherit;
}
.nav-links a:hover,.nav-drop-btn:hover{color:var(--brand-700);background:var(--brand-50)}
.nav-links a.active-link{color:var(--brand-700);font-weight:700;background:var(--brand-50)}
.nav-drop{position:relative}
.nav-drop-menu{
  position:absolute;top:calc(100% + 10px);right:0;min-width:230px;
  background:var(--bg-card);border:1px solid var(--border);border-radius:14px;
  box-shadow:0 12px 40px rgba(15,23,42,0.12);padding:8px;
  opacity:0;visibility:hidden;transform:translateY(-6px);
  transition:all var(--t) var(--ease);
}
.nav-drop:hover .nav-drop-menu,.nav-drop:focus-within .nav-drop-menu{opacity:1;visibility:visible;transform:translateY(0)}
.nav-drop-menu a{
  display:flex;align-items:center;gap:10px;width:100%;
  padding:9px 12px;border-radius:9px;font-size:14px;
}
.nav-drop-menu a:hover{background:var(--brand-50)}
.nav-drop-menu .mdi{width:18px;height:18px;color:var(--brand-600);flex-shrink:0}

/* 移动端汉堡菜单 */
.nav-toggle{
  display:none;width:42px;height:42px;border-radius:11px;
  border:1px solid var(--border);background:var(--bg-card);
  align-items:center;justify-content:center;cursor:pointer;flex-shrink:0;
}
.nav-toggle svg{width:22px;height:22px;color:var(--text)}

/* ========== 5. Hero ========== */
.hero{padding:132px 24px 44px;max-width:920px;margin:0 auto;text-align:center;position:relative}
.hero-badge{
  display:inline-flex;align-items:center;gap:8px;
  padding:7px 18px;border-radius:50px;
  background:var(--brand-50);border:1px solid var(--brand-200);
  font-size:13px;font-weight:600;color:var(--brand-700);
  margin-bottom:24px;animation:fadeInUp 0.8s ease both;
}
.hero-badge .dot{width:8px;height:8px;border-radius:50%;background:var(--green);box-shadow:0 0 0 3px var(--green-soft);animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:0.45}}
.hero h1{
  font-size:clamp(32px,5.5vw,54px);
  font-weight:800;line-height:1.14;letter-spacing:-1px;
  margin-bottom:18px;animation:fadeInUp 0.8s ease 0.1s both;
}
.hero p.sub{font-size:clamp(15px,2vw,18px);color:var(--text-dim);max-width:660px;margin:0 auto;animation:fadeInUp 0.8s ease 0.2s both}
.hero .hero-stat{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 20px;border-radius:50px;
  background:var(--green-soft);border:1px solid rgba(22,163,74,0.28);
  font-size:14px;font-weight:600;color:#15803d;
  margin-top:24px;animation:fadeInUp 0.8s ease 0.3s both;
}
.hero .hero-stat svg{width:16px;height:16px;flex-shrink:0}
.hero .hero-note{
  display:inline-flex;align-items:flex-start;gap:10px;text-align:left;
  max-width:680px;margin:24px auto 0;padding:14px 18px;border-radius:14px;
  background:var(--amber-soft);border:1px solid rgba(245,158,11,0.3);
  font-size:14px;color:var(--text-dim);line-height:1.7;animation:fadeInUp 0.8s ease 0.35s both;
}
.hero .hero-note svg{flex-shrink:0;width:20px;height:20px;color:var(--amber);margin-top:2px}
@keyframes fadeInUp{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}

/* ========== 6. Section 通用 ========== */
.section{max-width:var(--maxw);margin:0 auto;padding:80px 24px}
.section-title{text-align:center;margin-bottom:48px}
.section-title h2{font-size:clamp(26px,4vw,36px);font-weight:800;margin-bottom:12px;letter-spacing:-0.5px}
.section-title p{color:var(--text-dim);font-size:16px;max-width:560px;margin:0 auto}

/* ========== 7. 按钮 ========== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 24px;border-radius:12px;border:1px solid transparent;
  font-size:15px;font-weight:600;font-family:inherit;
  text-decoration:none;cursor:pointer;transition:all var(--t-fast);
  white-space:nowrap;
}
.btn svg{width:17px;height:17px;flex-shrink:0}
.btn-primary{background:var(--grad-brand);color:#fff;box-shadow:var(--shadow-btn)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:var(--shadow-btn-hover)}
.btn-ghost{background:var(--bg-card);border-color:var(--border-bright);color:var(--text-dim)}
.btn-ghost:hover{border-color:var(--brand-600);color:var(--brand-700);background:var(--brand-50)}

/* ========== 8. 卡片 ========== */
.card{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius);box-shadow:var(--shadow);
  transition:all var(--t);
}

/* ========== 9. Footer ========== */
.footer{border-top:1px solid var(--border);padding:52px 24px 32px;text-align:center;background:var(--bg-card)}
.footer-logo{display:inline-flex;align-items:center;gap:10px;margin-bottom:14px;font-size:18px;font-weight:800}
.footer p{color:var(--text-faint);font-size:14px;margin-bottom:8px}
.footer .copyright{margin-top:22px;padding-top:22px;border-top:1px solid var(--border);color:var(--text-faint);font-size:13px;line-height:2}
.footer-links{display:flex;justify-content:center;gap:8px 20px;margin:20px 0;flex-wrap:wrap}
.footer-links a{color:var(--text-dim);text-decoration:none;font-size:14px;padding:4px 8px;border-radius:8px;transition:all var(--t-fast)}
.footer-links a:hover{color:var(--brand-700);background:var(--brand-50)}

/* ========== 10. 工具页通用（转换器/上传区） ========== */
.converter-wrap{max-width:820px;margin:0 auto;padding:30px 24px 0}
.converter-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:32px;box-shadow:var(--shadow)}
.drop-zone{
  border:2px dashed var(--border-bright);border-radius:16px;
  padding:52px 24px;text-align:center;cursor:pointer;
  transition:all var(--t);background:var(--brand-50);
}
.drop-zone:hover,.drop-zone.dragover{border-color:var(--brand-600);background:rgba(37,99,235,0.08);transform:translateY(-2px)}
.drop-zone.dragover{border-style:solid}
.drop-icon{
  width:64px;height:64px;margin:0 auto 18px;border-radius:18px;
  display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,rgba(37,99,235,0.16),rgba(14,165,233,0.16));color:var(--brand-600);
  transition:transform var(--t-slow);
}
.drop-zone:hover .drop-icon{transform:translateY(-4px) scale(1.05)}
.drop-icon svg{width:30px;height:30px}
.drop-zone h3{font-size:20px;margin-bottom:8px;font-weight:600}
.drop-zone p{color:var(--text-dim);font-size:15px}
.drop-zone .browse{color:var(--cyan);font-weight:600;text-decoration:underline;cursor:pointer}
.drop-zone .hint{margin-top:14px;font-size:13px;color:var(--text-faint)}

.file-info{
  display:flex;align-items:center;gap:16px;
  padding:18px 20px;border-radius:16px;
  background:var(--brand-50);border:1px solid var(--border);
  margin-bottom:20px;
}
.file-icon{width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center;flex-shrink:0;font-size:11px;font-weight:800;color:#fff;background:var(--grad-brand)}
.file-details{flex:1;min-width:0}
.file-name{font-weight:600;font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.file-size{font-size:13px;color:var(--text-faint)}
.file-status{text-align:right;flex-shrink:0}
.status-ok{color:var(--green);font-size:14px;font-weight:600}
.status-bad{color:var(--rose);font-size:14px;font-weight:600}

/* 主转换按钮（各页 id 不同，用通用类） */
.convert-btn{
  display:none;width:100%;padding:15px;border:none;border-radius:14px;
  background:var(--grad-brand);color:#fff;font-size:16px;font-weight:700;
  font-family:inherit;cursor:pointer;box-shadow:var(--shadow-btn);
  transition:transform var(--t-fast),box-shadow var(--t-fast);
  align-items:center;justify-content:center;gap:8px;
}
.convert-btn:hover{transform:translateY(-2px);box-shadow:var(--shadow-btn-hover)}
.convert-btn.show{display:flex;animation:fadeInUp 0.5s ease}

/* 信任条 */
.trust-bar{max-width:1000px;margin:40px auto 0;padding:0 24px;display:flex;flex-wrap:wrap;justify-content:center;gap:14px 32px}
.trust-item{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--text-dim);font-weight:500}
.trust-item svg{width:18px;height:18px;color:var(--green);flex-shrink:0}

/* ========== 10c. 热门场景（长尾搜索词入口） ========== */
.scene-section{max-width:var(--maxw);margin:0 auto;padding:72px 24px}
.scene-head{text-align:center;margin-bottom:36px}
.scene-head h2{font-size:clamp(24px,3.6vw,32px);font-weight:800;letter-spacing:-0.5px;margin-bottom:10px}
.scene-head p{color:var(--text-dim);font-size:16px;max-width:560px;margin:0 auto}
.scene-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px}
.scene-card{
  position:relative;display:flex;gap:16px;align-items:flex-start;
  background:var(--bg-card);border:1px solid var(--border);border-radius:16px;
  padding:22px 22px 22px 20px;text-decoration:none;overflow:hidden;
  transition:all var(--t) var(--ease);
}
.scene-card::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:4px;
  background:var(--grad-brand);opacity:0;transition:opacity var(--t);
}
.scene-card:hover{transform:translateY(-4px);border-color:var(--border-bright);box-shadow:var(--shadow-glow)}
.scene-card:hover::before{opacity:1}
.scene-icon{
  width:44px;height:44px;border-radius:12px;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;
  background:var(--brand-50);color:var(--brand-600);
  transition:all var(--t);
}
.scene-card:hover .scene-icon{background:var(--brand-600);color:#fff}
.scene-icon svg{width:22px;height:22px}
.scene-body{min-width:0;flex:1}
.scene-body h3{font-size:16px;font-weight:700;color:var(--text);margin-bottom:6px;line-height:1.4}
.scene-body p{font-size:13.5px;color:var(--text-dim);line-height:1.65;margin-bottom:10px}
.scene-go{
  display:inline-flex;align-items:center;gap:5px;
  font-size:13px;font-weight:700;color:var(--brand-600);transition:gap var(--t-fast);
}
.scene-card:hover .scene-go{gap:9px}
.scene-go svg{width:14px;height:14px}
@media(max-width:768px){
  .scene-section{padding:56px 20px}
  .scene-grid{grid-template-columns:1fr}
}

/* ========== 10b. 相关工具横向推荐条（提升页面间流转） ========== */
.related-tools{max-width:1000px;margin:44px auto 0;padding:0 24px}
.related-tools .rt-label{font-size:13px;font-weight:700;color:var(--text-faint);text-transform:uppercase;letter-spacing:.5px;margin-bottom:14px;text-align:center}
.related-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px}
.related-card{
  display:flex;align-items:center;gap:11px;
  background:var(--bg-card);border:1px solid var(--border);border-radius:14px;
  padding:14px 16px;text-decoration:none;transition:all var(--t);
}
.related-card:hover{transform:translateY(-3px);border-color:var(--brand-600);box-shadow:var(--shadow-glow)}
.related-card .rc-icon{width:36px;height:36px;border-radius:10px;flex-shrink:0;display:flex;align-items:center;justify-content:center;background:var(--brand-50);color:var(--brand-600)}
.related-card .rc-icon svg{width:18px;height:18px}
.related-card .rc-text{min-width:0}
.related-card .rc-text b{display:block;font-size:14px;font-weight:600;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.related-card .rc-text small{font-size:12px;color:var(--text-faint)}
@media(max-width:480px){.related-grid{grid-template-columns:repeat(2,1fr)}}

/* ========== 11. Toast ========== */
.toast{
  position:fixed;bottom:30px;left:50%;transform:translateX(-50%) translateY(100px);
  background:var(--text);color:#fff;
  border-radius:12px;padding:13px 22px;
  font-size:14px;z-index:1000;box-shadow:0 12px 40px rgba(15,23,42,0.3);
  transition:transform 0.4s var(--ease);max-width:90vw;text-align:center;
}
.toast.show{transform:translateX(-50%) translateY(0)}

/* ========== 12. 响应式 ========== */
@media(max-width:1024px){
  .nav-links a,.nav-drop-btn{padding:8px 10px;font-size:14px}
}
@media(max-width:860px){
  .nav-links{
    position:fixed;top:var(--nav-h);left:0;right:0;
    flex-direction:column;align-items:stretch;gap:2px;
    background:var(--bg-card);border-bottom:1px solid var(--border);
    padding:12px 20px 20px;box-shadow:0 12px 30px rgba(15,23,42,0.1);
    max-height:calc(100vh - var(--nav-h));overflow-y:auto;
  }
  .nav-links.open{display:flex}
  .nav-links a,.nav-drop-btn{padding:12px 14px;font-size:16px;border-radius:10px}
  .nav-drop-menu{
    position:static;opacity:1;visibility:visible;transform:none;
    box-shadow:none;border:none;padding:0 0 0 12px;min-width:0;
  }
  .nav-toggle{display:flex}
}
@media(max-width:768px){
  .hero{padding:112px 20px 32px}
  .converter-card{padding:24px}
  .drop-zone{padding:38px 20px}
  .section{padding:60px 20px}
  .footer{padding:44px 20px 28px}
}