:root{--bg:#f5f5f5;--text:#1a1a1a;--card-bg:#fff;--card-border:#e0e0e0;--input-border:#e0e0e0;--input-focus:#888;--btn-bg:#fff;--btn-border:#ddd;--btn-text:#333;--btn-hover-bg:#f0f0f0;--btn-primary-bg:#111;--btn-primary-text:#fff;--btn-primary-hover-bg:#333;--btn-primary-border:#111;--shadow:#00000014;--shadow-hover:#0000001f;--toast-bg:#111;--toast-text:#fff;--loading-text:#888;--header-text:#999}:root[data-theme=dark]{--bg:#1a1a1c;--text:#e0e0e0;--card-bg:#2a2a2e;--card-border:#3a3a3e;--input-border:#444;--input-focus:#aaa;--btn-bg:#2a2a2e;--btn-border:#444;--btn-text:#ddd;--btn-hover-bg:#3a3a3e;--btn-primary-bg:#e0e0e0;--btn-primary-text:#111;--btn-primary-hover-bg:#ccc;--btn-primary-border:#e0e0e0;--shadow:#0006;--shadow-hover:#00000080;--toast-bg:#e0e0e0;--toast-text:#111;--loading-text:#888;--header-text:#777}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg);color:var(--text);min-height:100vh;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif}.app-header{justify-content:space-between;align-items:center;max-width:860px;margin:0 auto;padding:16px 16px 0;display:flex}.app-header.editor-header{max-width:1200px}.app-header-title{color:var(--header-text);font-size:14px;font-weight:600}.action-btn-locked{opacity:.4;cursor:not-allowed}.action-btn-locked:hover{background:var(--btn-bg);box-shadow:0 2px 8px var(--shadow);transform:none}.app-container{max-width:860px;margin:0 auto;padding:24px 16px 100px}.app-container.editor-mode{max-width:1200px}.card-wrapper{background:var(--card-bg);border:1px solid var(--card-border);border-radius:20px;margin-bottom:24px;padding:32px 28px;transition:background .2s,border-color .2s}@media (width<=640px){.card-wrapper{border-radius:16px;padding:20px 16px}}.loading{min-height:100vh;color:var(--loading-text);justify-content:center;align-items:center;font-size:16px;display:flex}.loading-text{align-items:center;gap:8px;display:flex}.loading-spinner{border:2px solid var(--card-border);border-top-color:var(--loading-text);border-radius:50%;width:16px;height:16px;animation:.8s linear infinite spin;display:inline-block}@keyframes spin{to{transform:rotate(360deg)}}.floating-actions{z-index:100;gap:10px;display:flex;position:fixed;bottom:24px;right:24px}.action-btn{border:1px solid var(--btn-border);background:var(--btn-bg);color:var(--btn-text);cursor:pointer;box-shadow:0 2px 8px var(--shadow);border-radius:12px;padding:10px 20px;font-size:14px;font-weight:600;transition:all .15s}.action-btn:hover{background:var(--btn-hover-bg);box-shadow:0 4px 12px var(--shadow-hover);transform:translateY(-1px)}.action-btn-primary{background:var(--btn-primary-bg);color:var(--btn-primary-text);border-color:var(--btn-primary-border)}.action-btn-primary:hover{background:var(--btn-primary-hover-bg)}.toast{background:var(--toast-bg);color:var(--toast-text);z-index:200;opacity:0;pointer-events:none;border-radius:10px;padding:10px 24px;font-size:14px;font-weight:600;transition:opacity .3s;position:fixed;bottom:90px;left:50%;transform:translate(-50%)}.toast-visible{opacity:1}.editor-layout{grid-template-columns:1fr 1fr;gap:20px;min-height:calc(100vh - 48px);display:grid}.editor-textarea{border:1px solid var(--input-border);background:var(--card-bg);width:100%;min-height:calc(100vh - 48px);color:var(--text);resize:none;border-radius:14px;outline:none;padding:20px;font-family:SF Mono,Menlo,Monaco,Courier New,monospace;font-size:15px;line-height:1.7;transition:border-color .15s}.editor-textarea:focus{border-color:var(--input-focus)}.editor-preview{border:1px solid var(--card-border);background:var(--card-bg);border-radius:14px;padding:20px;overflow-y:auto}@media (width<=768px){.editor-layout{grid-template-columns:1fr}.editor-textarea{min-height:50vh}.floating-actions{bottom:16px;right:16px}}:root{--md-link:#2563eb;--md-link-hover:#1d4ed8;--md-blockquote-border:#ddd;--md-blockquote-text:#555;--md-code-bg:#f1f1f1;--md-pre-bg:#111;--md-pre-text:#fff;--md-table-border:#ddd;--md-th-bg:#f5f5f5;--md-hr:#e0e0e0;--md-empty-text:#bbb;--md-link-btn-bg:#111;--md-link-btn-text:#fff}:root[data-theme=dark]{--md-link:#60a5fa;--md-link-hover:#93bbfd;--md-blockquote-border:#555;--md-blockquote-text:#aaa;--md-code-bg:#333;--md-pre-bg:#0d0d0d;--md-pre-text:#e0e0e0;--md-table-border:#444;--md-th-bg:#333;--md-hr:#3a3a3e;--md-empty-text:#666;--md-link-btn-bg:#e0e0e0;--md-link-btn-text:#111}.md-content{color:var(--text);font-size:16px;line-height:1.75}.md-content.md-empty{text-align:center;color:var(--md-empty-text);padding:80px 20px;font-size:16px}.md-content .md-empty-icon{margin-bottom:16px;font-size:48px}.md-content .md-empty-title{color:var(--text);margin-bottom:12px;font-size:20px;font-weight:700}.md-content .md-empty-desc{margin-bottom:12px;font-size:15px;line-height:1.6}.md-content .md-empty-hint{color:var(--md-empty-text);font-size:13px;line-height:1.6}.md-content h1,.md-content h2,.md-content h3,.md-content h4,.md-content h5,.md-content h6{margin-top:24px;margin-bottom:12px;font-weight:700;line-height:1.25}.md-content h1{font-size:2em}.md-content h2{font-size:1.5em}.md-content h3{font-size:1.25em}.md-content h4{font-size:1em}.md-content p{margin-bottom:12px}.md-content a{color:var(--md-link);text-underline-offset:3px;text-decoration:underline}.md-content a:hover{color:var(--md-link-hover)}.md-content blockquote{border-left:4px solid var(--md-blockquote-border);color:var(--md-blockquote-text);margin:16px 0;padding-left:16px}.md-content code{background:var(--md-code-bg);border-radius:6px;padding:2px 6px;font-family:SF Mono,Menlo,Monaco,Courier New,monospace;font-size:.9em}.md-content pre{background:var(--md-pre-bg);color:var(--md-pre-text);border-radius:14px;margin:16px 0;padding:16px;overflow:auto}.md-content pre code{color:inherit;background:0 0;padding:0}.md-content ul,.md-content ol{margin:12px 0;padding-left:24px}.md-content li{margin-bottom:4px}.md-content table{border-collapse:collapse;width:100%;margin:16px 0}.md-content th,.md-content td{border:1px solid var(--md-table-border);text-align:left;padding:8px 10px}.md-content th{background:var(--md-th-bg);font-weight:700}.md-content hr{border:none;border-top:1px solid var(--md-hr);margin:24px 0}.md-content img{border-radius:10px;max-width:100%}.md-content .button-paragraph{margin:14px 0}.md-content .link-button{background:var(--md-link-btn-bg);color:var(--md-link-btn-text);text-align:center;border-radius:16px;padding:15px 18px;font-weight:700;text-decoration:none;display:block}.md-content .link-button:hover{opacity:.86}