/* ================================
   在线录屏 - 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}
*{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}
#header.scrolled{background:rgba(255,255,255,0.95);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);box-shadow:0 2px 20px rgba(0,0,0,.06)}
.record-section{padding:24px 0 32px}
.record-panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:32px 24px;box-shadow:0 4px 12px rgba(0,0,0,.06);text-align:center}
.control-bar{display:flex;gap:16px;justify-content:center;margin-bottom:24px;flex-wrap:wrap}
.record-btn{padding:14px 32px;border:none;border-radius:100px;font-family:inherit;font-size:15px;font-weight:600;color:#fff;cursor:pointer;display:flex;align-items:center;gap:10px;transition:all .15s ease;background:linear-gradient(135deg,#DC2626 0%,#E11D48 100%);box-shadow:0 4px 12px rgba(220,38,38,.3)}
.record-btn:hover{transform:translateY(-1px);box-shadow:0 8px 20px rgba(220,38,38,.4)}
.record-btn:disabled{opacity:.5;cursor:not-allowed;transform:none}
.record-btn.stop{background:linear-gradient(135deg,#6B7280 0%,#4B5563 100%);box-shadow:0 4px 12px rgba(107,114,128,.3)}
.record-btn.stop:hover{box-shadow:0 8px 20px rgba(107,114,128,.4)}
.record-icon{width:20px;height:20px}
.record-icon.recording{animation:pulse-rec 1s infinite}
@keyframes pulse-rec{0%,100%{opacity:1}50%{opacity:.4}}
.timer-display{font-family:'SF Mono','Cascadia Code',monospace;font-size:48px;font-weight:700;color:var(--text);margin-bottom:8px}
.timer-display.recording{color:#DC2626}
.status-text{font-size:14px;color:var(--text-muted);margin-bottom:20px}
.preview-area{width:100%;max-height:400px;background:#000;border-radius:var(--radius);overflow:hidden;display:flex;align-items:center;justify-content:center;min-height:250px;margin-bottom:20px}
.preview-video{width:100%;max-height:400px;display:block}
.preview-placeholder{display:flex;flex-direction:column;align-items:center;gap:12px;color:var(--text-muted);padding:40px}
.preview-placeholder.hidden{display:none}
.placeholder-icon{width:48px;height:48px}
.download-btn{padding:12px 32px;background:var(--primary);border:none;border-radius:100px;font-family:inherit;font-size:14px;font-weight:600;color:#fff;cursor:pointer;transition:all .15s ease;box-shadow:0 1px 3px rgba(0,0,0,.06)}
.download-btn:hover{background:var(--primary-hover);transform:translateY(-1px);box-shadow:0 4px 12px rgba(0,0,0,.1)}
.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:first-child{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}.timer-display{font-size:36px}.control-bar{flex-direction:column;align-items:center}}