/* ============================================
   小鱼儿的数字花园 — 公共样式
   所有页面共享，通过 <link rel="stylesheet" href="/style.css"> 引入
   ============================================ */

/* --- Reset & Variables --- */
*{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#0a0a0a;--surface:#111;--surface-hover:#1a1a1a;--border:#1e1e1e;
  --text:#e8e8e8;--text-dim:#888;--text-muted:#555;
  --accent:#646cff;--accent-glow:rgba(100,108,255,0.25);
  --pink:#ff6b9d;--gradient:linear-gradient(135deg,var(--accent),var(--pink));
  --green:#22c55e;--orange:#f97316;--gold:#d4a853;
  --max-w:1100px;--nav-h:56px;
}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;overflow-x:hidden}
body{font-family:'LXGW WenKai',-apple-system,sans-serif;background:var(--bg);color:var(--text);line-height:1.8;overflow-x:hidden;min-height:100vh;display:flex;flex-direction:column}
a,button{-webkit-tap-highlight-color:transparent;touch-action:manipulation}
img{max-width:100%;height:auto}
::-webkit-scrollbar{width:6px}
::-webkit-scrollbar-track{background:var(--bg)}
::-webkit-scrollbar-thumb{background:#333;border-radius:3px}

/* --- Navigation --- */
.nav{position:fixed;top:0;width:100%;z-index:100;background:rgba(10,10,10,.85);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:1px solid var(--border)}
.nav-inner{max-width:var(--max-w);margin:0 auto;padding:0 24px;height:var(--nav-h);display:flex;align-items:center;justify-content:space-between}
.nav-logo{font-size:1.05rem;font-weight:700;color:var(--text);text-decoration:none;display:flex;align-items:center;gap:8px}
.nav-logo .fish{font-size:1.2rem}
.nav-links{display:flex;gap:6px;align-items:center}
.nav-links a{color:var(--text-dim);text-decoration:none;font-size:.82rem;transition:color .2s;padding:6px 10px;border-radius:8px;white-space:nowrap}
.nav-links a:hover{color:var(--text);background:rgba(255,255,255,.05)}
.nav-links a.active{color:var(--accent);font-weight:600}

/* --- Nav Dropdown --- */
.nav-dropdown{position:relative}
.nav-dropdown-trigger{color:var(--text-dim);font-size:.82rem;cursor:pointer;padding:6px 10px;border-radius:8px;white-space:nowrap;transition:all .2s;display:flex;align-items:center;gap:4px;user-select:none}
.nav-dropdown-trigger:hover{color:var(--text);background:rgba(255,255,255,.05)}
.dd-arrow{font-size:.65rem;transition:transform .2s}
.nav-dropdown.open .dd-arrow{transform:rotate(180deg)}
.nav-dropdown-menu{position:absolute;top:calc(100% + 8px);left:50%;transform:translateX(-50%);background:#181818;border:1px solid var(--border);border-radius:14px;padding:8px;min-width:220px;opacity:0;visibility:hidden;transform:translateX(-50%) translateY(-4px);transition:all .2s;z-index:150;box-shadow:0 16px 48px rgba(0,0,0,.5)}
.nav-dropdown.open .nav-dropdown-menu{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0)}
.dd-item{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:10px;text-decoration:none;color:var(--text);transition:all .15s}
.dd-item:hover{background:rgba(255,255,255,.06)}
.dd-item.active{background:rgba(100,108,255,.1)}
.dd-icon{font-size:1.2rem;flex-shrink:0;width:28px;text-align:center}
.dd-text{display:flex;flex-direction:column;gap:1px}
.dd-label{font-size:.82rem;font-weight:600}
.dd-desc{font-size:.7rem;color:var(--text-muted)}
.hamburger{display:none;background:none;border:none;color:var(--text);font-size:1.3rem;cursor:pointer;padding:8px}
.mobile-menu{position:fixed;top:0;right:-260px;width:260px;height:100%;background:#111;z-index:200;transition:right .3s;border-left:1px solid var(--border);padding:20px;overflow-y:auto}
.mobile-menu.open{right:0}
.mobile-menu .close-btn{background:none;border:none;color:var(--text);font-size:1.3rem;cursor:pointer;float:right}
.mobile-menu a{display:block;color:var(--text-dim);text-decoration:none;padding:12px 0;border-bottom:1px solid var(--border);font-size:.9rem}
.mobile-overlay{position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:199;display:none}
.mobile-overlay.show{display:block}
.mobile-divider{font-size:.7rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:1px;padding:16px 0 6px;border-bottom:none;font-weight:600}

/* --- Main Content Area --- */
main{flex:1;padding-top:calc(var(--nav-h) + 20px)}

/* --- Section --- */
.section{max-width:var(--max-w);margin:0 auto;padding:60px 24px}
.section-title{font-size:clamp(1.4rem,3vw,2rem);font-weight:800;margin-bottom:.6rem}
.section-subtitle{font-size:.9rem;color:var(--text-dim);margin-bottom:2rem}

/* --- Hero (index only) --- */
.hero{flex:1;display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden;padding:100px 24px 60px}
.hero-bg{position:absolute;inset:0;background:radial-gradient(ellipse at 30% 40%,rgba(100,108,255,.1) 0%,transparent 50%),radial-gradient(ellipse at 70% 60%,rgba(255,107,157,.06) 0%,transparent 50%)}
.hero-content{text-align:center;position:relative;z-index:2;max-width:600px}
.hero-badge{display:inline-flex;align-items:center;gap:6px;padding:5px 14px;border-radius:100px;background:rgba(100,108,255,.08);border:1px solid rgba(100,108,255,.12);font-size:.7rem;color:var(--accent);margin-bottom:1.5rem}
.hero-badge .dot{width:5px;height:5px;border-radius:50%;background:var(--green);animation:pulse 2s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}
.hero-fish{font-size:3.5rem;margin-bottom:1rem;animation:heroFish 4s ease-in-out infinite;filter:drop-shadow(0 0 16px rgba(100,108,255,.25))}
@keyframes heroFish{0%,100%{transform:translateY(0) rotate(-2deg)}50%{transform:translateY(-8px) rotate(2deg)}}
.hero-title{font-size:clamp(1.8rem,4.5vw,2.8rem);font-weight:900;line-height:1.3;margin-bottom:.8rem}
.hero-title span{background:var(--gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.hero-subtitle{font-size:.95rem;color:var(--text-dim);margin-bottom:2rem;line-height:1.7}
.hero-typing{color:var(--accent);font-weight:600;border-right:2px solid var(--accent);animation:blink .8s step-end infinite;min-width:140px;display:inline-block;text-align:left}
@keyframes blink{50%{border-color:transparent}}

/* --- Cards Grid --- */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:2.5rem}
.card{background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:28px 20px;text-align:center;transition:all .3s;text-decoration:none;color:inherit;position:relative;overflow:hidden}
.card::before{content:'';position:absolute;top:0;left:0;right:0;height:2px;background:var(--card-color,var(--accent));opacity:.5;transition:opacity .3s}
.card:hover{border-color:var(--card-color,var(--accent));transform:translateY(-6px);box-shadow:0 16px 48px rgba(0,0,0,.3)}
.card:hover::before{opacity:1}
.card-icon{font-size:2.2rem;margin-bottom:12px;display:block}
.card h3{font-size:1rem;font-weight:800;margin-bottom:6px}
.card p{font-size:.78rem;color:var(--text-dim);line-height:1.6;margin-bottom:14px}
.card .btn{font-size:.75rem;padding:6px 16px;border-radius:8px;background:var(--gradient);color:#fff;border:none;cursor:pointer;font-family:inherit;font-weight:600;text-decoration:none;display:inline-block}

/* --- Feature Card (for tools, about etc) --- */
.feature-card{background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:24px;text-decoration:none;color:inherit;transition:all .3s;display:block}
.feature-card:hover{border-color:var(--accent);transform:translateY(-4px);box-shadow:0 12px 40px rgba(0,0,0,.3)}
.feature-card .card-icon{font-size:2rem;margin-bottom:10px;display:block}
.feature-card h3{font-size:1rem;font-weight:700;margin-bottom:6px}
.feature-card p{font-size:.8rem;color:var(--text-dim);line-height:1.6}

/* --- Divider (ocean theme) --- */
.divider-wrap{text-align:center;padding:20px 0}
.divider-wrap::before{content:'';display:block;width:60%;max-width:400px;height:1px;background:linear-gradient(90deg,transparent,var(--border),transparent);margin:0 auto}
.divider-icon{font-size:1.2rem;display:inline-block;margin-top:-10px;background:var(--bg);padding:0 12px}

/* --- Tags --- */
.tag{display:inline-block;padding:3px 10px;border-radius:100px;font-size:.7rem;font-weight:600;background:rgba(100,108,255,.1);color:var(--accent);border:1px solid rgba(100,108,255,.15)}
.tag.hot{background:rgba(255,107,157,.1);color:var(--pink);border-color:rgba(255,107,157,.15)}
.tag.new{background:rgba(34,197,94,.1);color:var(--green);border-color:rgba(34,197,94,.15)}

/* --- Buttons --- */
.btn-primary{display:inline-flex;align-items:center;gap:8px;padding:10px 24px;border-radius:10px;background:var(--gradient);color:#fff;border:none;cursor:pointer;font-family:inherit;font-size:.9rem;font-weight:600;transition:all .3s;text-decoration:none}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 24px var(--accent-glow)}
.btn-secondary{display:inline-flex;align-items:center;gap:8px;padding:10px 24px;border-radius:10px;background:var(--surface);color:var(--text);border:1px solid var(--border);cursor:pointer;font-family:inherit;font-size:.9rem;font-weight:600;transition:all .3s;text-decoration:none}
.btn-secondary:hover{border-color:var(--accent);transform:translateY(-2px)}

/* --- Input / Textarea --- */
.input,.textarea{width:100%;padding:12px 16px;border-radius:10px;background:var(--surface);border:1px solid var(--border);color:var(--text);font-family:inherit;font-size:.9rem;transition:border-color .2s;outline:none}
.input:focus,.textarea:focus{border-color:var(--accent)}
.textarea{resize:vertical;min-height:120px;line-height:1.6}

/* --- Footer --- */
.footer{text-align:center;padding:32px 24px;color:var(--text-muted);font-size:.75rem;border-top:1px solid var(--border);margin-top:auto}
.footer a{color:var(--text-dim);text-decoration:none;transition:color .2s}
.footer a:hover{color:var(--pink)}

/* --- Reveal animation --- */
.reveal{opacity:0;transform:translateY(20px);transition:opacity .6s,transform .6s}
.reveal.visible{opacity:1;transform:translateY(0)}

/* --- Responsive --- */
@media(max-width:768px){
  .nav-links{display:none}
  .hamburger{display:block}
  .hero{padding:80px 16px 40px}
  .hero-content{max-width:100%}
  .hero-fish{font-size:2.8rem}
  .hero-title{font-size:1.6rem}
  .hero-subtitle{font-size:.85rem}
  .cards{grid-template-columns:1fr;gap:10px;margin-top:2rem}
  .card{padding:16px 20px;border-radius:12px;display:flex;align-items:center;gap:16px;text-align:left}
  .card::before{height:100%;width:2px;top:0;left:0;right:auto}
  .card-icon{font-size:1.6rem;margin-bottom:0;flex-shrink:0}
  .card h3{font-size:.9rem;margin-bottom:0}
  .card p{font-size:.75rem;margin-bottom:0;line-height:1.4}
  .card .btn{display:none}
  .card:hover{transform:translateY(-2px)}
  .section{padding:40px 16px}
  .feature-card-grid{grid-template-columns:1fr !important}
}
@media(max-width:480px){
  .section{padding:32px 12px}
  .hero{padding:70px 12px 30px}
}