/* ================================
   网页定时刷新 - 自定义样式
   ================================ */
:root{--bg:#FAFAF9;--bg-alt:#F5F5F4;--surface:#FFFFFF;--border:#E7E5E4;--border-strong:#D6D3D1;--text:#1E293B;--text-secondary:#52525B;--text-muted:#71717A;--primary:#4F46E5;--primary-hover:#4338CA;--primary-light:rgba(79,70,229,.08);--secondary:#F97316;--accent:#EC4899;--success:#059669;--radius:10px;--radius-lg:14px;--shadow-sm:0 1px 2px rgba(0,0,0,.04);--shadow:0 4px 12px rgba(0,0,0,.06)}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Inter','Noto Sans SC',system-ui,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh;-webkit-font-smoothing:antialiased}
.toast{position:fixed;top:24px;right:24px;background:var(--text);color:var(--bg);padding:10px 18px;border-radius:100px;font-size:14px;font-weight:500;display:flex;align-items:center;gap:8px;z-index:1000;transform:translateX(calc(100% + 40px));transition:transform .3s cubic-bezier(.34,1.56,.64,1);box-shadow:0 4px 16px rgba(0,0,0,.12)}
.toast.show{transform:translateX(0)}.toast-dot{width:8px;height:8px;background:var(--success);border-radius:50%}
.page{max-width:960px;margin:0 auto;padding:0 32px}
.tool-section{padding:32px 0 24px}
.tool-wrapper{display:flex;flex-direction:column;gap:24px}
.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:28px;box-shadow:var(--shadow)}
.panel-title{font-size:16px;font-weight:700;color:var(--text);margin-bottom:20px}
.input-row{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-bottom:20px}
.input-field{padding:12px 16px;background:var(--bg-alt);border:1px solid var(--border);border-radius:var(--radius);font-family:'SF Mono','Cascadia Code',monospace;font-size:16px;color:var(--text);outline:none;width:120px;text-align:center;transition:border-color .2s}
.input-field:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(79,70,229,.1)}
.label-text{font-size:14px;color:var(--text-secondary);font-weight:500}
.presets{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:20px}
.preset-btn{padding:8px 16px;border:1px solid var(--border);border-radius:100px;font-family:inherit;font-size:13px;font-weight:500;cursor:pointer;background:transparent;color:var(--text-muted);transition:all .15s ease}
.preset-btn:hover{border-color:rgba(79,70,229,.25);color:var(--primary)}
.preset-btn.active{background:var(--primary);border-color:var(--primary);color:#fff}
.countdown{font-size:48px;font-weight:700;color:var(--text);text-align:center;font-family:'SF Mono','Cascadia Code',monospace;margin:20px 0}
.countdown.running{color:var(--primary);animation:pulse 1s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.5}}
.status-text{font-size:14px;color:var(--text-muted);text-align:center}
.btn{padding:12px 32px;border-radius:100px;font-family:inherit;font-size:15px;font-weight:600;cursor:pointer;transition:all .2s ease;border:none}
.btn-primary{background:linear-gradient(135deg,#3B82F6 0%,#06B6D4 100%);color:#fff;box-shadow:0 4px 12px rgba(59,130,246,.3)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 20px rgba(59,130,246,.4)}
.btn-danger{background:#EF4444;color:#fff;box-shadow:0 4px 12px rgba(239,68,68,.3)}
.btn-danger:hover{transform:translateY(-2px);box-shadow:0 8px 20px rgba(239,68,68,.4)}
.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}
.sound-option{display:flex;align-items:center;gap:8px;margin:12px 0}
.sound-option input[type=checkbox]{width:18px;height:18px;accent-color:var(--primary)}
.guide-section{margin-top:16px;margin-bottom:64px;background:#fff;border:1px solid var(--border);border-radius:12px;overflow:hidden}
.guide-toggle{display:flex;align-items:center;justify-content:space-between;width:100%;padding:14px 20px;background:none;border:none;cursor:pointer;transition:background .15s ease}
.guide-toggle:hover{background:var(--bg-alt)}.guide-toggle-title{display:flex;align-items:center;gap:8px;font-size:14px;font-weight:600;color:#1E293B}
.guide-toggle.open .toggle-arrow{transform:rotate(180deg)}.toggle-arrow{transition:transform .2s ease;color:var(--text-muted)}
.guide-list{padding:0 20px 20px}.guide-list.hidden{display:none}
.guide-item{padding:16px 0;border-top:1px solid var(--border)}
.guide-item-title{font-size:14px;font-weight:600;color:#1E293B;margin-bottom:6px}
.guide-item-body{font-size:13px;color:var(--text-secondary);line-height:1.8}
::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:#f1f5f9}::-webkit-scrollbar-thumb{background:#A5B4FC;border-radius:4px}
::selection{background:rgba(79,70,229,.2);color:#1E293B}
@media(max-width:768px){.page{padding:0 16px}.input-row{flex-direction:column;align-items:flex-start}.countdown{font-size:36px}}