:root{--bg-page: #F6F4EE;--bg-card: #FFFFFF;--bg-input: #FFFFFF;--bg-pill: #F7F5EE;--border-card: 1px solid #E8E5DE;--border-input: 1px solid #E2DFC3;--border-pill: 1px dashed #D5D1C5;--yellow-accent: #FDE082;--yellow-hover: #F7D468;--yellow-soft: #FDF3CE;--ink-dark: #332E21;--ink-medium: #555045;--ink-muted: #888275;--green-live: #27AE60;--radius-card: 24px;--radius-inner: 16px;--shadow-subtle: 0 4px 16px rgba(0, 0, 0, .02);font-family:Pretendard,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,sans-serif;color:var(--ink-dark);background-color:var(--bg-page);font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased}*{box-sizing:border-box;margin:0;padding:0}html,body{min-width:320px;min-height:100vh;background-color:var(--bg-page);color:var(--ink-dark)}button,textarea,input{font-family:inherit;color:inherit}button{border:0;cursor:pointer;background:none}button,a{-webkit-tap-highlight-color:transparent}.app-shell{min-height:100vh;max-width:980px;margin:0 auto;padding:24px 20px 60px;display:flex;flex-direction:column;gap:20px}.topbar{display:flex;align-items:center;justify-content:space-between;padding:8px 4px}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink-dark);font-weight:800;font-size:18px}.brand-icon{width:28px;height:28px;object-fit:contain}.brand-title{font-weight:800;font-size:19px;letter-spacing:-.3px}.session-time{display:flex;align-items:center;gap:8px;padding:6px 14px;background:var(--bg-card);border:var(--border-card);border-radius:20px;font-size:13px;font-weight:700;box-shadow:var(--shadow-subtle)}.session-progress{display:block;width:44px;height:6px;border-radius:3px;background:#e8e5de;overflow:hidden}.session-progress:after{content:"";display:block;width:var(--remaining, 100%);height:100%;background:var(--ink-dark)}.main-grid{display:grid;grid-template-columns:320px 1fr;gap:20px;align-items:start}.main-grid.joined-qr{grid-template-columns:1fr}.card{background:var(--bg-card);border:var(--border-card);border-radius:var(--radius-card);box-shadow:var(--shadow-subtle);padding:24px;display:flex;flex-direction:column;gap:16px}.card-header{display:flex;align-items:center;justify-content:space-between}.card-title-group{display:flex;align-items:center;gap:10px}.step-num-badge{display:inline-flex;align-items:center;justify-content:center;width:26px;height:26px;background:var(--yellow-accent);color:var(--ink-dark);font-size:14px;font-weight:800;border-radius:50%;flex-shrink:0}.card-title{font-size:17px;font-weight:800;color:var(--ink-dark);letter-spacing:-.3px}.status-tag{display:inline-flex;align-items:center;gap:5px;font-size:12px;font-weight:800;letter-spacing:.5px}.status-tag.is-live{color:var(--green-live)}.status-tag.is-waiting{color:var(--ink-muted)}.status-dot-live{width:7px;height:7px;border-radius:50%;background:currentColor}.is-waiting .status-dot-live{animation:pulse 1.5s infinite}@keyframes pulse{50%{opacity:.3}}.device-tag{font-size:16px;font-weight:600;display:inline-flex;align-items:center}.qr-card-container{display:flex;flex-direction:column;align-items:center;gap:16px;text-align:center}.qr-frame-box{width:100%;display:flex;align-items:center;justify-content:center;padding:16px;background:#fff;border:var(--border-card);border-radius:20px}.qr-frame-box canvas{display:block}.room-code-pill{width:100%;display:flex;align-items:center;justify-content:space-between;padding:10px 16px;background:var(--bg-pill);border:var(--border-pill);border-radius:16px;font-size:13px;font-weight:700;cursor:pointer;transition:all .15s ease}.room-code-pill:hover{background:#efece1}.room-id-value{font-family:monospace;font-size:13px;font-weight:700;color:var(--ink-dark)}.right-column{display:flex;flex-direction:column;gap:20px}.composer-box{position:relative;display:flex;flex-direction:column;background:var(--bg-card);border:var(--border-input);border-radius:var(--radius-inner);padding:16px 18px 12px;transition:border-color .15s ease}.composer-box:focus-within{border-color:#b5b095}.composer-box textarea{width:100%;min-height:120px;font-size:15px;line-height:1.6;color:var(--ink-dark);background:transparent;border:0;outline:none;resize:vertical}.composer-box textarea::placeholder{color:#b2aca0}.composer-footer{display:flex;align-items:center;justify-content:space-between;margin-top:10px;padding-top:8px}.key-hint{font-size:12px;color:#b2aca0;font-weight:600}.send-btn-yellow{display:inline-flex;align-items:center;justify-content:center;padding:10px 20px;background:var(--yellow-accent);color:var(--ink-dark);font-size:18px;font-weight:800;border-radius:20px;transition:all .15s ease}.send-btn-yellow:hover:not(:disabled){background:var(--yellow-hover);transform:translateY(-1px)}.send-btn-yellow:disabled{opacity:.4;cursor:not-allowed;transform:none}.history-subtitle{font-size:13px;color:var(--ink-muted);font-weight:700;margin-top:2px}.history-expiry-tag{font-size:13px;color:var(--ink-muted);font-weight:600;display:inline-flex;align-items:center;gap:4px}.card-divider{height:1px;background:#efece6;margin:-4px 0 4px}.empty-state-box{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:30px 20px}.empty-icon-yellow{display:flex;align-items:center;justify-content:center;width:52px;height:52px;background:var(--yellow-soft);border-radius:16px;font-size:24px}.message-list{display:flex;flex-direction:column;gap:12px}.message-card{position:relative;display:flex;flex-direction:column;gap:6px;padding:16px 18px;background:var(--bg-card);border:var(--border-card);border-radius:var(--radius-inner)}.message-card.is-mine{background:#fff;border-left:4px solid var(--yellow-accent)}.message-card.is-received{background:#faf9f5;border-left:4px solid var(--ink-dark)}.message-meta{display:flex;align-items:center;justify-content:space-between;font-size:11px;font-weight:700;color:var(--ink-muted)}.sender-tag{color:var(--ink-dark)}.message-body{font-size:14px;line-height:1.6;white-space:pre-wrap;word-break:break-word;padding-right:50px}a.message-body{color:var(--ink-dark);font-weight:700;text-decoration:underline;text-underline-offset:3px}.copy-btn-small{position:absolute;top:14px;right:14px;padding:5px 10px;background:var(--bg-pill);border:var(--border-card);border-radius:12px;font-size:14px;transition:all .15s ease}.copy-btn-small:hover{background:var(--yellow-accent)}.toast{position:fixed;z-index:100;left:50%;bottom:24px;transform:translate(-50%,10px);padding:10px 22px;background:var(--ink-dark);color:#fff;font-size:13px;font-weight:700;border-radius:20px;box-shadow:0 4px 16px #00000026;opacity:0;pointer-events:none;transition:all .18s ease}.toast.is-visible{opacity:1;transform:translate(-50%)}.toast.is-error{background:#e74c3c}.state-page{min-height:70vh;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;padding:40px 20px;text-align:center}.state-icon-yellow{display:flex;align-items:center;justify-content:center;width:64px;height:64px;background:var(--yellow-soft);border-radius:20px;font-size:28px}.state-title{font-size:18px;font-weight:800}.state-desc{font-size:13px;color:var(--ink-muted)}.restart-btn-yellow{display:inline-flex;align-items:center;padding:12px 24px;background:var(--yellow-accent);color:var(--ink-dark);font-size:14px;font-weight:800;text-decoration:none;border-radius:20px;transition:all .15s ease}.restart-btn-yellow:hover{background:var(--yellow-hover)}.loading-dots{font-size:26px;letter-spacing:6px;color:var(--ink-muted);animation:blink 1.2s infinite}@keyframes blink{50%{opacity:.3}}@media(max-width:820px){.main-grid{grid-template-columns:1fr}}