/* A2A 独立工作空间。表面与文字继承站内主题，结构不受全局弹窗样式影响。 */
#a2a-hub {
  --ah-bg:var(--bg,#0f1520);--ah-surface:var(--surface,#18202e);--ah-raised:var(--surface2,#202a3a);
  --ah-text:var(--text,#ecf0f8);--ah-muted:var(--text2,#a0adc2);--ah-border:var(--border,#303b4c);
  --ah-accent:#8caaff;--ah-violet:#b0a0ef;--ah-teal:#6fcebd;--ah-danger:var(--red,#ef8b8b);
  --ah-tint:color-mix(in srgb,var(--ah-accent) 9%,var(--ah-surface));
  color-scheme:dark;position:fixed;inset:0;margin:auto;padding:0;width:min(1400px,calc(100vw - 48px));height:min(960px,calc(100dvh - 48px));max-width:none;max-height:none;
  border:1px solid var(--ah-border);border-radius:18px;background:var(--ah-bg);color:var(--ah-text);box-shadow:0 32px 110px #050b1955;overflow:hidden;
  font-family:Inter,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;font-size:14px;line-height:1.6;text-align:left;
}
[data-theme="light"] #a2a-hub {--ah-accent:#3865d9;--ah-violet:#7b57bd;--ah-teal:#238774;color-scheme:light}
[data-theme="warm"] #a2a-hub {--ah-accent:#e6b779;--ah-violet:#c3a0d0;--ah-teal:#9dbd93}
#a2a-hub::backdrop {background:#09122366;backdrop-filter:blur(8px)}
#a2a-hub * {box-sizing:border-box}
#a2a-hub h1,#a2a-hub h2,#a2a-hub h3,#a2a-hub p,#a2a-hub ol {margin:0;color:inherit}
#a2a-hub h1 {font-size:28px;line-height:1.35;font-weight:700;letter-spacing:-.6px}
#a2a-hub h2 {font-size:17px;line-height:1.5;font-weight:650;letter-spacing:-.2px}
#a2a-hub h3 {font-size:16px;line-height:1.5;font-weight:650}
#a2a-hub button,#a2a-hub input,#a2a-hub select,#a2a-hub textarea {font:inherit;color:inherit;letter-spacing:normal}
#a2a-hub button {cursor:pointer;border:0;background:transparent;text-align:left;border-radius:0;line-height:1.5;box-shadow:none;transition:background .16s,border-color .16s,box-shadow .16s,transform .16s}
#a2a-hub button:disabled {opacity:.5;cursor:default}
#a2a-hub button:focus-visible,#a2a-hub input:focus-visible,#a2a-hub textarea:focus-visible,#a2a-hub select:focus-visible,#a2a-hub summary:focus-visible {outline:2px solid var(--ah-accent);outline-offset:3px}
#a2a-hub .a2a-icon {display:inline-block;width:19px;height:19px;flex:0 0 19px;vertical-align:middle}
#a2a-hub .a2a-shell {display:grid;grid-template-columns:214px minmax(0,1fr);height:100%;min-height:0}
#a2a-hub .a2a-sidebar {display:flex;flex-direction:column;min-height:0;padding:26px 16px 18px;border-right:1px solid var(--ah-border);background:var(--ah-surface);overflow:auto}
#a2a-hub .a2a-brand {display:flex;gap:12px;align-items:center;padding:0 9px 25px}
#a2a-hub .a2a-brand-mark {display:grid;place-items:center;width:39px;height:39px;border-radius:11px;background:var(--ah-accent);color:var(--ah-surface);box-shadow:0 4px 12px color-mix(in srgb,var(--ah-accent) 15%,transparent)}
#a2a-hub .a2a-brand-mark .a2a-icon {width:23px;height:23px;stroke-width:1.8}
#a2a-hub .a2a-brand strong {display:block;font-size:23px;font-weight:750;line-height:1.15;letter-spacing:-.8px}
#a2a-hub .a2a-brand small {display:block;font-size:11px;color:var(--ah-muted);margin-top:4px}
#a2a-hub .a2a-workspace-switch {display:flex;align-items:center;gap:9px;border:1px solid var(--ah-border);border-radius:10px;padding:11px 9px;margin:0 0 28px;min-width:0;background:var(--ah-raised)}
#a2a-hub .a2a-workspace-switch>div {min-width:0;flex:1}
#a2a-hub .a2a-workspace-initial {display:grid;place-items:center;width:29px;height:29px;flex:0 0 29px;background:var(--ah-surface);border:1px solid var(--ah-border);border-radius:7px;font-size:12px;font-weight:650}
#a2a-hub .a2a-workspace-switch small {display:block;color:var(--ah-muted);font-size:10px;line-height:1.3}
#a2a-hub .a2a-workspace-switch strong {font-size:12px}
#a2a-hub .a2a-workspace-switch select {width:100%;min-width:0;padding:3px 0 0;font-size:12px;font-weight:600;border:0;background:transparent;border-radius:0;text-overflow:ellipsis}
#a2a-hub select option {background:var(--ah-surface);color:var(--ah-text)}
#a2a-hub .a2a-nav-label {display:block;font-size:10px;color:var(--ah-muted);letter-spacing:1px;padding:0 12px 9px}
#a2a-hub .a2a-navigation {display:grid;gap:4px}
#a2a-hub .a2a-navigation button {width:100%;display:flex;align-items:center;gap:11px;padding:11px 13px;border-radius:8px;color:var(--ah-muted);font-size:13px;min-height:42px}
#a2a-hub .a2a-navigation button:hover {background:var(--ah-raised);color:var(--ah-text)}
#a2a-hub .a2a-navigation button[aria-current=page] {background:var(--ah-tint);color:var(--ah-accent);font-weight:650}
#a2a-hub .a2a-navigation button b {margin-left:auto;font-size:10px;padding:1px 6px;background:var(--ah-raised);border-radius:5px;color:var(--ah-accent)}
#a2a-hub .a2a-nav-divider {height:1px;background:var(--ah-border);margin:14px 10px}
#a2a-hub .a2a-sidebar-tip {display:flex;gap:11px;align-items:center;margin:auto 9px 20px;padding-top:35px;color:var(--ah-muted);font-size:11px;line-height:1.7}
#a2a-hub .a2a-sidebar-tip .a2a-icon {color:var(--ah-accent);width:23px;height:23px}
#a2a-hub .a2a-sidebar-footer {border-top:1px solid var(--ah-border);padding-top:12px;display:grid;gap:3px}
#a2a-hub .a2a-sidebar-footer button {padding:9px 10px;display:flex;align-items:center;gap:9px;border-radius:7px;font-size:12px;color:var(--ah-muted)}
#a2a-hub .a2a-sidebar-footer button:hover {background:var(--ah-raised);color:var(--ah-text)}
#a2a-hub .a2a-sidebar-footer button .a2a-icon:last-child:not(:first-child) {margin-left:auto;width:13px;height:13px}
#a2a-hub .a2a-workspace {display:flex;flex-direction:column;min-height:0;min-width:0}
#a2a-hub .a2a-topbar {display:flex;align-items:center;justify-content:space-between;min-height:62px;padding:0 27px;border-bottom:1px solid var(--ah-border);background:var(--ah-surface);flex-shrink:0}
#a2a-hub .a2a-topbar>div {display:flex;align-items:center;gap:14px;font-size:11px;color:var(--ah-muted)}
#a2a-hub .a2a-topbar>div>.a2a-icon {width:11px;height:11px;flex-basis:11px}
#a2a-hub .a2a-topbar strong {color:var(--ah-text);font-weight:500}
#a2a-hub .a2a-topbar .a2a-topbar-note {font-size:10px;letter-spacing:.4px}
#a2a-hub .a2a-icon-button {display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;padding:0;border:1px solid var(--ah-border);border-radius:8px;background:var(--ah-surface);color:var(--ah-muted)}
#a2a-hub .a2a-icon-button:hover {background:var(--ah-raised);color:var(--ah-text)}
#a2a-hub .a2a-main {flex:1;min-height:0;overflow:auto;padding:32px 36px 0;overscroll-behavior:contain;scrollbar-width:thin;scrollbar-color:var(--ah-border) transparent;scroll-behavior:smooth}
#a2a-hub .a2a-page-heading {display:flex;align-items:center;justify-content:space-between;gap:20px;margin:0 0 27px}
#a2a-hub .a2a-page-heading>div {min-width:0}
#a2a-hub .a2a-page-heading h1 {margin:8px 0}
#a2a-hub .a2a-page-heading p {font-size:12px;color:var(--ah-muted);line-height:1.7;overflow-wrap:anywhere}
#a2a-hub .a2a-kicker {display:block;font-size:10px;font-weight:650;letter-spacing:1.25px;color:var(--ah-muted);line-height:1.6}
#a2a-hub .a2a-label {display:block;font-size:11px;font-weight:600;color:var(--ah-muted);margin-bottom:9px}
#a2a-hub .a2a-button {display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:38px;padding:9px 15px;border:1px solid var(--ah-border);border-radius:8px;background:var(--ah-surface);color:var(--ah-text);font-size:12px;font-weight:550;white-space:nowrap}
#a2a-hub .a2a-button:hover:not(:disabled) {background:var(--ah-raised);border-color:color-mix(in srgb,var(--ah-accent) 45%,var(--ah-border))}
#a2a-hub .a2a-button.primary {color:var(--ah-surface);background:var(--ah-accent);border-color:var(--ah-accent);font-weight:650}
[data-theme="light"] #a2a-hub .a2a-button.primary {color:#fff}
#a2a-hub .a2a-button.primary:hover:not(:disabled) {background:var(--ah-accent);filter:brightness(1.08);box-shadow:0 3px 11px color-mix(in srgb,var(--ah-accent) 18%,transparent)}
#a2a-hub .a2a-button .a2a-icon {width:16px;height:16px;flex-basis:16px}
#a2a-hub .a2a-text-button {display:inline-flex;align-items:center;gap:7px;padding:0;color:var(--ah-accent);font-size:12px;font-weight:550;line-height:1.6}
#a2a-hub .a2a-text-button:hover {text-decoration:underline;text-underline-offset:4px}
#a2a-hub .a2a-text-button .a2a-icon {width:15px;height:15px;flex-basis:15px}
#a2a-hub .a2a-badge {display:inline-flex;align-items:center;gap:5px;padding:3px 8px;border-radius:5px;background:var(--ah-tint);color:var(--ah-accent);font-size:10px;line-height:1.5;font-weight:550;white-space:nowrap}
#a2a-hub .a2a-badge.warning {color:var(--ah-danger);background:color-mix(in srgb,var(--ah-danger) 10%,var(--ah-surface))}
#a2a-hub .a2a-note {font-size:12px;color:var(--ah-muted);line-height:1.8}
#a2a-hub .a2a-welcome {display:grid;grid-template-columns:1fr 1fr;gap:30px;align-items:center;background:var(--ah-surface);border:1px solid var(--ah-border);border-radius:14px;padding:27px 31px}
#a2a-hub .a2a-welcome h2 {font-size:29px;line-height:1.38;letter-spacing:-.7px;margin:11px 0 12px}
#a2a-hub .a2a-welcome p {font-size:12px;color:var(--ah-muted);line-height:1.85;margin:0 0 14px}
#a2a-hub .a2a-route-art {padding:24px 22px 20px;border:1px solid var(--ah-border);border-radius:12px;background:var(--ah-raised);box-shadow:0 8px 22px #050c1505;min-width:0}
#a2a-hub .a2a-route-label {display:flex;align-items:center;gap:7px;font-size:10px;color:var(--ah-muted);letter-spacing:.3px}
#a2a-hub .a2a-live-dot {width:5px;height:5px;border-radius:50%;background:var(--ah-teal)}
#a2a-hub .a2a-route-chain {display:flex;align-items:center;justify-content:center;margin:24px 0 22px}
#a2a-hub .a2a-route-node {display:flex;flex-direction:column;align-items:center;gap:9px;min-width:58px;font-size:10px;color:var(--ah-muted)}
#a2a-hub .a2a-route-node>.a2a-icon {box-sizing:content-box;padding:15px;border:1px solid var(--ah-border);border-radius:12px;background:var(--ah-surface);color:var(--ah-text);width:22px;height:22px}
#a2a-hub .a2a-route-node.ai>.a2a-icon {color:var(--ah-accent);background:var(--ah-tint);border-color:color-mix(in srgb,var(--ah-accent) 35%,var(--ah-border))}
#a2a-hub .a2a-route-line {flex:1;min-width:10px;height:1px;background:var(--ah-border);margin:0 5px 25px;position:relative}
#a2a-hub .a2a-route-line::after {content:'';position:absolute;right:0;top:-2px;width:5px;height:5px;border-right:1px solid var(--ah-muted);border-top:1px solid var(--ah-muted);transform:rotate(45deg)}
#a2a-hub .a2a-route-note {display:flex;align-items:center;justify-content:center;gap:6px;border-top:1px dashed var(--ah-border);padding-top:13px;font-size:10px;color:var(--ah-muted)}
#a2a-hub .a2a-route-note .a2a-icon {width:13px;height:13px;flex-basis:13px;color:var(--ah-teal)}
#a2a-hub .a2a-stat-strip {display:grid;grid-template-columns:1fr 1fr 1.25fr;border:1px solid var(--ah-border);border-radius:12px;background:var(--ah-surface);margin-top:17px;overflow:hidden}
#a2a-hub .a2a-stat-strip>button {display:flex;align-items:center;gap:12px;padding:19px 22px;min-width:0;border-right:1px solid var(--ah-border)}
#a2a-hub .a2a-stat-strip>button:last-child {border:0}
#a2a-hub .a2a-stat-strip>button:hover {background:var(--ah-raised)}
#a2a-hub .a2a-stat-strip>button>span:not(.a2a-stat-icon) {min-width:0;flex:1}
#a2a-hub .a2a-stat-strip>button>.a2a-icon {margin-left:auto;color:var(--ah-muted);width:13px;height:13px;flex-basis:13px}
#a2a-hub .a2a-stat-strip small {display:block;font-size:10px;color:var(--ah-muted);margin-bottom:3px}
#a2a-hub .a2a-stat-strip strong {font-size:24px;line-height:1.15;font-weight:650}
#a2a-hub .a2a-stat-strip em {font-size:10px;color:var(--ah-muted);font-weight:400;font-style:normal;margin-left:8px}
#a2a-hub .a2a-stat-icon {display:grid;place-items:center;width:36px;height:36px;flex:0 0 36px;border-radius:10px;background:var(--ah-tint);color:var(--ah-accent)}
#a2a-hub .violet {--card-accent:var(--ah-violet)}
#a2a-hub .teal {--card-accent:var(--ah-teal)}
#a2a-hub .blue {--card-accent:var(--ah-accent)}
#a2a-hub .a2a-stat-icon.violet {color:var(--ah-violet);background:color-mix(in srgb,var(--ah-violet) 9%,var(--ah-surface))}
#a2a-hub .a2a-stat-icon.teal {color:var(--ah-teal);background:color-mix(in srgb,var(--ah-teal) 9%,var(--ah-surface))}
#a2a-hub .a2a-stat-strip .a2a-position-name {display:block;font-size:13px;line-height:1.6;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}
#a2a-hub .a2a-position-path {display:block;font-size:9px;line-height:1.7;color:var(--ah-muted);overflow:hidden;white-space:nowrap;text-overflow:ellipsis}
#a2a-hub .a2a-section {margin-top:30px}
#a2a-hub .a2a-section-heading {display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:15px}
#a2a-hub .a2a-section-heading>span {font-size:11px;color:var(--ah-muted)}
#a2a-hub .a2a-action-cards {display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
#a2a-hub .a2a-action-card {padding:21px 20px 16px;border:1px solid var(--ah-border);background:var(--ah-surface);border-radius:12px;display:flex;flex-direction:column;align-items:flex-start;min-width:0}
#a2a-hub .a2a-action-card:hover:not(:disabled) {border-color:var(--card-accent);box-shadow:0 6px 18px #06163209;transform:translateY(-2px)}
#a2a-hub .a2a-action-symbol {display:grid;place-items:center;width:36px;height:36px;border-radius:10px;background:color-mix(in srgb,var(--card-accent) 9%,var(--ah-surface));color:var(--card-accent);margin-bottom:13px}
#a2a-hub .a2a-action-copy strong {display:block;font-size:15px;font-weight:650;margin-bottom:7px}
#a2a-hub .a2a-action-copy>span {display:block;font-size:11px;line-height:1.85;color:var(--ah-muted);min-height:40px}
#a2a-hub .a2a-action-bottom {display:flex;align-items:center;justify-content:space-between;width:100%;border-top:1px solid var(--ah-border);padding-top:13px;margin-top:19px;font-size:10px;color:var(--card-accent);font-weight:550}
#a2a-hub .a2a-action-bottom .a2a-icon {width:15px;height:15px}
#a2a-hub .a2a-overview-bottom {display:grid;grid-template-columns:1.2fr 1fr;gap:18px;margin-top:27px}
#a2a-hub .a2a-panel {background:var(--ah-surface);border:1px solid var(--ah-border);border-radius:12px;overflow:hidden}
#a2a-hub .a2a-panel-heading {display:flex;justify-content:space-between;align-items:center;padding:19px 22px;border-bottom:1px solid var(--ah-border)}
#a2a-hub .a2a-panel-heading h2 {display:flex;align-items:center;gap:9px;font-size:14px}
#a2a-hub .a2a-panel-heading h2 .a2a-icon {color:var(--ah-muted);width:16px;height:16px}
#a2a-hub .a2a-recent-row {width:100%;padding:17px 21px;display:flex;align-items:center;gap:12px;border-bottom:1px solid var(--ah-border)}
#a2a-hub .a2a-recent-row:last-child {border-bottom:0}
#a2a-hub .a2a-recent-row:hover {background:var(--ah-raised)}
#a2a-hub .a2a-recent-row>span:nth-child(2) {flex:1;min-width:0}
#a2a-hub .a2a-recent-row strong {display:block;font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-weight:600}
#a2a-hub .a2a-recent-row small {display:block;font-size:10px;color:var(--ah-muted);margin-top:5px}
#a2a-hub .a2a-avatar {display:grid;place-items:center;flex:0 0 33px;width:33px;height:33px;border-radius:9px;background:var(--ah-tint);color:var(--ah-accent);font-size:12px;font-weight:650}
#a2a-hub .a2a-unread-dot {display:inline-block;width:6px;height:6px;flex:0 0 6px;border-radius:50%;background:var(--ah-accent)}
#a2a-hub .a2a-quiet-empty {display:flex;align-items:center;justify-content:center;flex-direction:column;min-height:205px;padding:25px;text-align:center;color:var(--ah-muted);gap:10px}
#a2a-hub .a2a-quiet-empty>.a2a-icon {width:28px;height:28px;opacity:.6;margin-bottom:4px}
#a2a-hub .a2a-quiet-empty strong {font-size:12px;color:var(--ah-text);font-weight:550}
#a2a-hub .a2a-quiet-empty p {font-size:11px;line-height:1.8}
#a2a-hub .a2a-onboarding {padding:23px 26px;border:1px solid var(--ah-border);border-radius:12px;background:var(--ah-tint)}
#a2a-hub .a2a-onboarding h2 {margin:8px 0;font-size:16px}
#a2a-hub .a2a-onboarding>p {font-size:11px;line-height:1.8;color:var(--ah-muted)}
#a2a-hub .a2a-onboarding ol {list-style:none;padding:14px 0;display:grid;gap:8px}
#a2a-hub .a2a-onboarding li {display:flex;align-items:center;gap:10px;font-size:11px}
#a2a-hub .a2a-onboarding li span {color:var(--ah-accent);font-size:10px;font-weight:600}
#a2a-hub .a2a-page-end {font-size:10px;text-align:center;color:var(--ah-muted);letter-spacing:.5px;padding:30px 0 23px;opacity:.8}
/* 分步沟通 */
#a2a-hub .a2a-stepper {display:flex;list-style:none;padding:0 0 24px;margin-bottom:21px;border-bottom:1px solid var(--ah-border);gap:0}
#a2a-hub .a2a-stepper li {display:flex;align-items:center;gap:9px;flex:1;font-size:11px;color:var(--ah-muted)}
#a2a-hub .a2a-stepper li::after {content:'';height:1px;background:var(--ah-border);flex:1;margin:0 20px}
#a2a-hub .a2a-stepper li:last-child {flex:0 0 auto}
#a2a-hub .a2a-stepper li:last-child::after {display:none}
#a2a-hub .a2a-stepper li>span {width:27px;height:27px;flex:0 0 27px;display:grid;place-items:center;border:1px solid var(--ah-border);border-radius:50%;font-size:10px;background:var(--ah-surface)}
#a2a-hub .a2a-stepper .current {color:var(--ah-accent);font-weight:650}
#a2a-hub .a2a-stepper .current>span {background:var(--ah-accent);color:var(--ah-surface);border-color:var(--ah-accent)}
[data-theme="light"] #a2a-hub .a2a-stepper .current>span {color:#fff}
#a2a-hub .a2a-stepper .done>span {color:var(--ah-accent);background:var(--ah-tint);border-color:transparent}
#a2a-hub .a2a-stepper .a2a-icon {width:14px;height:14px}
#a2a-hub .a2a-compose-layout {display:grid;grid-template-columns:minmax(0,1fr) 230px;gap:22px;align-items:start}
#a2a-hub .a2a-form-panel {background:var(--ah-surface);border:1px solid var(--ah-border);border-radius:12px;padding:25px;min-width:0}
#a2a-hub .a2a-form-panel h2 {font-size:16px}
#a2a-hub .a2a-form-panel>.a2a-note {margin:8px 0 14px}
#a2a-hub .a2a-field {display:grid;gap:8px;font-size:12px;font-weight:550;margin:17px 0}
#a2a-hub .a2a-field select,#a2a-hub .a2a-field input,#a2a-hub .a2a-field textarea {border:1px solid var(--ah-border);border-radius:8px;width:100%;min-width:0;padding:11px 12px;background:var(--ah-surface);color:var(--ah-text);font-size:13px;font-weight:400}
#a2a-hub .a2a-field textarea {min-height:160px;resize:vertical;line-height:1.9}
#a2a-hub input::placeholder,#a2a-hub textarea::placeholder {color:var(--ah-muted);opacity:.75}
#a2a-hub .a2a-form-divider {height:1px;background:var(--ah-border);margin:24px 0}
#a2a-hub .a2a-form-panel .a2a-action-cards {grid-template-columns:1fr;gap:10px;margin-top:17px}
#a2a-hub .a2a-form-panel .a2a-action-card {flex-direction:row;align-items:center;gap:13px;padding:17px 15px;transform:none}
#a2a-hub .a2a-form-panel .a2a-action-symbol {margin:0;flex:0 0 36px}
#a2a-hub .a2a-form-panel .a2a-action-copy {flex:1}
#a2a-hub .a2a-form-panel .a2a-action-copy strong {font-size:13px;margin-bottom:3px}
#a2a-hub .a2a-form-panel .a2a-action-copy>span {font-size:11px;min-height:0}
#a2a-hub .a2a-form-panel .a2a-action-bottom {border:0;width:auto;white-space:nowrap;margin:0;padding:0;gap:7px;font-size:10px}
#a2a-hub .a2a-form-panel .a2a-action-card.selected {border-color:var(--card-accent);background:color-mix(in srgb,var(--card-accent) 4%,var(--ah-surface));box-shadow:0 0 0 1px color-mix(in srgb,var(--card-accent) 20%,transparent)}
#a2a-hub .a2a-compose-aside {padding:24px 2px;color:var(--ah-muted)}
#a2a-hub .a2a-compose-aside h2 {color:var(--ah-text);font-size:16px;margin:16px 0 9px}
#a2a-hub .a2a-compose-aside>p {font-size:12px;line-height:1.9}
#a2a-hub .a2a-large-symbol {display:grid;place-items:center;width:49px;height:49px;border:1px solid var(--ah-border);background:var(--ah-surface);border-radius:13px;color:var(--card-accent)}
#a2a-hub .a2a-large-symbol .a2a-icon {width:25px;height:25px}
#a2a-hub .a2a-aside-rule {display:flex;gap:10px;border-top:1px solid var(--ah-border);padding-top:19px;margin:24px 0;font-size:11px;line-height:1.9}
#a2a-hub .a2a-aside-rule .a2a-icon {color:var(--ah-teal);width:16px;height:16px;flex-basis:16px;margin-top:2px}
#a2a-hub .a2a-form-footer {display:flex;align-items:center;justify-content:space-between;gap:15px;position:sticky;bottom:0;z-index:2;padding:17px 0;margin-top:24px;border-top:1px solid var(--ah-border);background:var(--ah-bg)}
#a2a-hub .a2a-form-footer>span {font-size:11px;color:var(--ah-muted)}
#a2a-hub .a2a-form-footer .a2a-note {display:flex;gap:7px;align-items:center}
#a2a-hub .a2a-report-settings {border-top:1px solid var(--ah-border);margin-top:22px;padding-top:17px}
#a2a-hub .a2a-report-settings summary {display:flex;align-items:center;justify-content:space-between;gap:8px;font-size:11px;cursor:pointer;list-style:none;color:var(--ah-muted)}
#a2a-hub .a2a-report-settings summary>span:first-child {display:flex;align-items:center;gap:7px;color:var(--ah-text)}
#a2a-hub .a2a-report-settings summary>span:first-child::after {content:'+';color:var(--ah-accent);font-size:15px;margin-left:3px}
#a2a-hub .a2a-report-settings[open] summary>span:first-child::after {content:'−'}
#a2a-hub .a2a-report-settings summary .a2a-icon {width:14px;height:14px;flex-basis:14px;color:var(--ah-muted)}
#a2a-hub .a2a-report-settings>div {padding-top:17px}
#a2a-hub .a2a-settings-grid {display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
#a2a-hub .a2a-settings-grid .a2a-field {font-size:10px}
#a2a-hub .a2a-settings-grid input,#a2a-hub .a2a-settings-grid select {padding:9px;font-size:11px}
#a2a-hub .a2a-target-list {max-height:235px;overflow:auto;border:1px solid var(--ah-border);border-radius:9px}
#a2a-hub input[type=checkbox] {width:15px;height:15px;flex:0 0 15px;accent-color:var(--ah-accent);margin:0}
#a2a-hub .a2a-target-row {display:flex;align-items:center;gap:10px;padding:14px 13px;border-bottom:1px solid var(--ah-border);cursor:pointer}
#a2a-hub .a2a-target-row:last-child {border:0}
#a2a-hub .a2a-target-avatar {display:grid;place-items:center;width:31px;height:31px;flex:0 0 31px;border-radius:8px;background:var(--ah-raised);color:var(--ah-muted)}
#a2a-hub .a2a-target-avatar .a2a-icon {width:16px;height:16px}
#a2a-hub .a2a-target-row>span:nth-last-child(2),#a2a-hub .a2a-target-row>span:last-child:not(.a2a-badge) {min-width:0;flex:1}
#a2a-hub .a2a-target-row strong {display:block;font-size:12px;font-weight:550}
#a2a-hub .a2a-target-row small {display:block;font-size:10px;color:var(--ah-muted);margin-top:3px;overflow-wrap:anywhere}
#a2a-hub .a2a-checkbox-line {display:flex;align-items:center;gap:8px;font-size:11px;margin-bottom:12px;color:var(--ah-muted)}
#a2a-hub .a2a-resource-list {border:1px solid var(--ah-border);border-radius:9px;max-height:360px;overflow:auto}
#a2a-hub .a2a-resource-row {display:flex;align-items:center;gap:10px;padding:13px;border-bottom:1px solid var(--ah-border);cursor:pointer}
#a2a-hub .a2a-resource-row:last-child {border-bottom:0}
#a2a-hub .a2a-resource-row:hover {background:var(--ah-raised)}
#a2a-hub .a2a-resource-row:has(input:checked) {background:var(--ah-tint)}
#a2a-hub .a2a-resource-row>span:nth-last-child(2) {min-width:0;flex:1}
#a2a-hub .a2a-resource-row strong {display:block;font-size:12px;font-weight:500;overflow-wrap:anywhere}
#a2a-hub .a2a-resource-row small {display:block;font-size:10px;color:var(--ah-muted);margin-top:4px}
#a2a-hub .a2a-file-icon {display:grid;place-items:center;width:27px;height:32px;color:var(--ah-muted);flex:0 0 27px}
#a2a-hub .a2a-selection-tick {color:var(--ah-accent);opacity:0;width:14px;height:14px}
#a2a-hub .a2a-resource-row:has(input:checked) .a2a-selection-tick {opacity:1}
#a2a-hub .a2a-search {display:flex;align-items:center;gap:9px;border:1px solid var(--ah-border);border-radius:8px;padding:9px 12px;background:var(--ah-surface);min-width:0}
#a2a-hub .a2a-search>.a2a-icon {width:15px;height:15px;flex-basis:15px;color:var(--ah-muted)}
#a2a-hub .a2a-search input {background:transparent;border:0;min-width:0;width:100%;outline:0;font-size:11px;padding:0;height:auto}
#a2a-hub .a2a-search:focus-within {border-color:var(--ah-accent);box-shadow:0 0 0 2px var(--ah-tint)}
#a2a-hub .a2a-search button {font-size:10px;flex-shrink:0}
#a2a-hub .a2a-form-panel>.a2a-search {margin-bottom:12px}
#a2a-hub .a2a-review-aside {padding:22px;border:1px solid var(--ah-border);border-radius:12px;background:var(--ah-surface)}
#a2a-hub #a2a-selection-summary>div {border-top:1px solid var(--ah-border);padding-top:18px;margin-top:18px;font-size:11px}
#a2a-hub #a2a-selection-summary strong {color:var(--ah-text);font-size:12px;font-weight:550}
#a2a-hub .a2a-selected-tags {display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}
#a2a-hub .a2a-selected-tags span {font-size:10px;border:1px solid var(--ah-border);border-radius:5px;padding:3px 6px;overflow-wrap:anywhere}
/* 收件与阅读 */
#a2a-hub .a2a-inbox-panel {border:1px solid var(--ah-border);border-radius:12px;background:var(--ah-surface);overflow:hidden}
#a2a-hub .a2a-list-toolbar {display:flex;align-items:center;justify-content:space-between;gap:18px;padding:17px 20px;border-bottom:1px solid var(--ah-border)}
#a2a-hub .a2a-list-toolbar>span {font-size:11px;color:var(--ah-muted)}
#a2a-hub .a2a-list-toolbar>div {display:flex;gap:10px}
#a2a-hub .a2a-list-toolbar .a2a-search {width:215px}
#a2a-hub .a2a-list-toolbar .a2a-button {font-size:11px;min-height:33px;padding:7px 10px}
#a2a-hub .a2a-list-toolbar .a2a-button.active {color:var(--ah-accent);background:var(--ah-tint);border-color:var(--ah-accent)}
#a2a-hub .a2a-message-row {width:100%;display:flex;align-items:center;gap:17px;padding:22px;border-bottom:1px solid var(--ah-border)}
#a2a-hub .a2a-message-row:last-child {border-bottom:0}
#a2a-hub .a2a-message-row:hover {background:var(--ah-raised)}
#a2a-hub .a2a-row-symbol {display:grid;place-items:center;width:40px;height:40px;flex:0 0 40px;border:1px solid var(--ah-border);border-radius:11px;color:var(--ah-accent);background:var(--ah-tint)}
#a2a-hub .a2a-row-symbol.notify {color:var(--ah-teal)}
#a2a-hub .a2a-row-copy {flex:1;min-width:0}
#a2a-hub .a2a-row-title {display:flex;align-items:center;gap:10px}
#a2a-hub .a2a-row-title strong {font-size:13px;font-weight:600;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}
#a2a-hub .a2a-row-summary {display:block;font-size:12px;color:var(--ah-muted);margin:6px 0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
#a2a-hub .a2a-row-copy>small {font-size:10px;color:var(--ah-muted);display:block;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}
#a2a-hub .a2a-row-meta {display:grid;align-self:stretch;align-content:space-between;text-align:right;font-size:10px;color:var(--ah-muted);padding:3px 0;flex-shrink:0;gap:10px}
#a2a-hub .a2a-row-meta>span {display:flex;align-items:center;justify-content:flex-end;gap:5px;color:var(--ah-accent)}
#a2a-hub .a2a-row-meta .a2a-icon {width:12px;height:12px;flex-basis:12px}
#a2a-hub .a2a-permission-empty,#a2a-hub .a2a-list-empty {display:flex;align-items:center;flex-direction:column;text-align:center;gap:15px;padding:65px 32px}
#a2a-hub .a2a-permission-empty {background:var(--ah-surface);border:1px solid var(--ah-border);border-radius:14px}
#a2a-hub .a2a-empty-symbol {display:grid;place-items:center;width:70px;height:70px;background:var(--ah-tint);border:1px solid var(--ah-border);border-radius:21px;color:var(--ah-accent);margin-bottom:10px}
#a2a-hub .a2a-empty-symbol>.a2a-icon {width:30px;height:30px}
#a2a-hub .a2a-permission-empty p,#a2a-hub .a2a-list-empty p {max-width:360px;color:var(--ah-muted);font-size:12px;line-height:1.9;margin-bottom:8px}
#a2a-hub .a2a-permission-empty>div {display:flex;gap:10px;flex-wrap:wrap;justify-content:center}
#a2a-hub .a2a-inline-empty {padding:22px;display:flex;align-items:center;gap:10px;flex-wrap:wrap;color:var(--ah-muted);font-size:12px}
#a2a-hub .a2a-back-link {margin-bottom:25px}
#a2a-hub .a2a-preview-summary {display:flex;gap:18px;align-items:center;font-size:12px;color:var(--ah-muted);margin-bottom:20px}
#a2a-hub .a2a-preview-summary>span:first-child {display:flex;align-items:center;gap:8px;color:var(--ah-text)}
#a2a-hub .a2a-preview-summary>.a2a-badge {margin-left:auto}
#a2a-hub .a2a-preview-messages {display:grid;gap:17px}
#a2a-hub .a2a-preview-card {border:1px solid var(--ah-border);border-radius:12px;background:var(--ah-surface);overflow:hidden}
#a2a-hub .a2a-preview-recipient {display:flex;align-items:center;gap:12px;padding:17px 24px;border-bottom:1px solid var(--ah-border);background:var(--ah-raised)}
#a2a-hub .a2a-preview-recipient>div {flex:1;min-width:0}
#a2a-hub .a2a-preview-recipient strong {display:block;font-size:12px;overflow-wrap:anywhere}
#a2a-hub .a2a-preview-recipient small {display:block;color:var(--ah-muted);font-size:10px;margin-bottom:3px}
#a2a-hub .a2a-preview-body {padding:27px 28px}
#a2a-hub .a2a-preview-body h2 {font-size:19px;margin-bottom:17px}
#a2a-hub .a2a-prose {white-space:pre-wrap;overflow-wrap:anywhere;font-size:14px;line-height:2;color:var(--ah-text)}
#a2a-hub .a2a-message-layout {display:grid;grid-template-columns:minmax(0,1fr) 220px;gap:22px;align-items:start}
#a2a-hub .a2a-message-paper {border:1px solid var(--ah-border);border-radius:12px;background:var(--ah-surface);padding:28px}
#a2a-hub .a2a-message-label {display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}
#a2a-hub .a2a-message-label time {font-size:10px;color:var(--ah-muted)}
#a2a-hub .a2a-message-paper h1 {font-size:25px;overflow-wrap:anywhere}
#a2a-hub .a2a-message-route {display:flex;align-items:center;flex-wrap:wrap;gap:8px;font-size:10px;color:var(--ah-muted);margin:15px 0 25px;padding-bottom:20px;border-bottom:1px solid var(--ah-border);overflow-wrap:anywhere}
#a2a-hub .a2a-message-route .a2a-icon {width:13px;height:13px;flex-basis:13px}
#a2a-hub .a2a-message-aside {padding:19px 3px}
#a2a-hub .a2a-message-aside>div {padding:16px 0;border-bottom:1px solid var(--ah-border);overflow-wrap:anywhere}
#a2a-hub .a2a-message-aside small {display:block;font-size:10px;color:var(--ah-muted);margin-bottom:6px}
#a2a-hub .a2a-message-aside strong {display:block;font-size:11px;font-weight:550}
#a2a-hub .a2a-message-aside .a2a-note {margin-top:20px;font-size:10px}
#a2a-hub .a2a-message-aside .danger {color:var(--ah-danger);margin-top:20px;font-size:11px}
#a2a-hub .a2a-read-state {color:var(--ah-teal)}
#a2a-hub .a2a-read-state .a2a-icon {width:13px;height:13px;margin-right:6px}
#a2a-hub .a2a-replies {margin-top:30px}
#a2a-hub .a2a-replies h2 {font-size:15px;margin-bottom:18px}
#a2a-hub .a2a-replies h2>span {font-size:11px;color:var(--ah-muted);margin-left:7px;font-weight:400}
#a2a-hub .a2a-reply {display:flex;gap:12px;margin:18px 0}
#a2a-hub .a2a-reply>div {min-width:0;flex:1}
#a2a-hub .a2a-reply strong {font-size:12px}
#a2a-hub .a2a-reply time {font-size:10px;color:var(--ah-muted);margin-left:10px}
#a2a-hub .a2a-reply .a2a-prose {background:var(--ah-surface);border:1px solid var(--ah-border);border-radius:0 10px 10px 10px;padding:12px 16px;font-size:12px;margin-top:8px}
#a2a-hub .a2a-reply-form {margin-top:22px;padding:20px;background:var(--ah-surface);border:1px solid var(--ah-border);border-radius:12px}
#a2a-hub .a2a-reply-form .a2a-field {margin-top:0}
#a2a-hub .a2a-reply-form textarea {min-height:110px}
/* 角色入口、演示和单章阅读 */
#a2a-hub .a2a-role-guide {display:grid;grid-template-columns:210px minmax(0,1fr);background:var(--ah-surface);border:1px solid var(--ah-border);border-radius:14px;overflow:hidden}
#a2a-hub .a2a-role-intro {padding:27px 24px;background:var(--ah-tint);border-right:1px solid var(--ah-border)}
#a2a-hub .a2a-role-intro h2 {font-size:22px;line-height:1.5;margin:17px 0 12px;letter-spacing:-.5px}
#a2a-hub .a2a-role-intro p {font-size:11px;line-height:1.9;color:var(--ah-muted)}
#a2a-hub .a2a-role-content {padding:24px 26px}
#a2a-hub .a2a-role-tabs {display:flex;gap:5px;border-bottom:1px solid var(--ah-border);padding-bottom:14px;margin-bottom:20px;flex-wrap:wrap}
#a2a-hub .a2a-role-tabs button {font-size:11px;color:var(--ah-muted);padding:7px 9px;border-radius:6px}
#a2a-hub .a2a-role-tabs button[aria-pressed=true] {color:var(--ah-accent);background:var(--ah-tint);font-weight:600}
#a2a-hub .a2a-role-content h3 {font-size:16px;margin-bottom:6px}
#a2a-hub .a2a-role-content>p {font-size:11px;line-height:1.85;color:var(--ah-muted)}
#a2a-hub .a2a-role-steps {display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px;margin:21px 0 18px}
#a2a-hub .a2a-role-steps>div {display:flex;gap:9px;align-items:flex-start}
#a2a-hub .a2a-role-steps span {display:grid;place-items:center;width:18px;height:18px;flex:0 0 18px;border:1px solid var(--ah-border);border-radius:50%;font-size:9px;color:var(--ah-accent);margin-top:1px}
#a2a-hub .a2a-role-steps p {font-size:11px;line-height:1.85}
#a2a-hub .a2a-demo {display:grid;grid-template-columns:1.1fr 1fr;gap:28px;margin-top:24px;padding:28px;border:1px solid var(--ah-border);border-radius:14px;background:var(--ah-surface)}
#a2a-hub .a2a-demo-copy h2 {font-size:20px;line-height:1.5;margin:11px 0 9px;letter-spacing:-.3px}
#a2a-hub .a2a-demo-copy>p {font-size:11px;color:var(--ah-muted);line-height:1.9;min-height:42px}
#a2a-hub .a2a-demo-steps {display:flex;padding:0;list-style:none;gap:12px;margin-top:22px;flex-wrap:wrap}
#a2a-hub .a2a-demo-steps li {display:flex;flex-direction:column;gap:8px;font-size:10px;color:var(--ah-muted);flex:1;min-width:55px}
#a2a-hub .a2a-demo-steps li>span {display:grid;place-items:center;width:23px;height:23px;font-size:10px;border:1px solid var(--ah-border);border-radius:7px;background:var(--ah-raised)}
#a2a-hub .a2a-demo-steps .active {color:var(--ah-accent);font-weight:600}
#a2a-hub .a2a-demo-steps .active>span {background:var(--ah-tint);border-color:var(--ah-accent)}
#a2a-hub .a2a-demo-steps .done>span {color:var(--ah-teal)}
#a2a-hub .a2a-demo-steps .a2a-icon {width:13px;height:13px;flex-basis:13px}
#a2a-hub .a2a-demo-controls {display:flex;gap:12px;align-items:center;margin:22px 0 10px}
#a2a-hub .a2a-demo-controls>span {font-size:10px;color:var(--ah-muted);letter-spacing:.5px}
#a2a-hub .a2a-demo-controls>.a2a-button {margin-left:auto;font-size:11px}
#a2a-hub .a2a-demo-copy>small {font-size:9px;color:var(--ah-muted)}
#a2a-hub .a2a-demo-stage {background:var(--ah-raised);border:1px solid var(--ah-border);border-radius:10px;padding:22px;display:flex;align-items:stretch;justify-content:center;flex-direction:column;min-height:280px;min-width:0}
#a2a-hub .a2a-demo-document {background:var(--ah-surface);border:1px solid var(--ah-border);border-radius:9px;padding:19px;box-shadow:0 6px 12px #07152508}
#a2a-hub .a2a-demo-document>div {display:flex;align-items:center;gap:6px;color:var(--ah-muted);font-size:9px;padding-bottom:13px;border-bottom:1px solid var(--ah-border)}
#a2a-hub .a2a-demo-document>div>.a2a-icon {width:13px;height:13px;flex-basis:13px;color:var(--ah-accent)}
#a2a-hub .a2a-demo-document>div>span {margin-left:auto;font-size:8px;background:var(--ah-tint);color:var(--ah-accent);padding:2px 5px;border-radius:4px}
#a2a-hub .a2a-demo-document h3 {font-size:13px;margin:16px 0 10px}
#a2a-hub .a2a-demo-document p {font-size:11px;line-height:2;color:var(--ah-muted)}
#a2a-hub .a2a-demo-document>small {display:block;font-size:9px;color:var(--ah-muted);margin-top:20px}
#a2a-hub .a2a-sample-button {display:flex;align-items:center;justify-content:center;gap:7px;background:var(--ah-tint);color:var(--ah-accent);border:1px solid color-mix(in srgb,var(--ah-accent) 25%,var(--ah-border));border-radius:6px;font-size:11px;padding:8px;margin-top:18px}
#a2a-hub .a2a-sample-button .a2a-icon {width:13px;height:13px}
#a2a-hub .a2a-demo-route {display:flex;align-items:center;justify-content:center;gap:18px}
#a2a-hub .a2a-demo-route>div {display:grid;justify-items:center;gap:9px;background:var(--ah-surface);border:1px solid var(--ah-border);border-radius:10px;padding:22px 18px;flex:1}
#a2a-hub .a2a-demo-route>div>.a2a-icon {color:var(--ah-accent);width:25px;height:25px}
#a2a-hub .a2a-demo-route>div>strong {font-size:12px;font-weight:600}
#a2a-hub .a2a-demo-route>div>span {font-size:9px;color:var(--ah-muted)}
#a2a-hub .a2a-demo-route>.a2a-icon {width:18px;height:18px;color:var(--ah-muted)}
#a2a-hub .a2a-demo-caption {font-size:9px!important;color:var(--ah-muted)!important;text-align:center;margin-top:24px!important}
#a2a-hub .a2a-demo-chat {display:flex;gap:10px;align-items:flex-start}
#a2a-hub .a2a-demo-chat>div {min-width:0;flex:1}
#a2a-hub .a2a-demo-chat small {display:block;font-size:9px;color:var(--ah-muted);margin-bottom:7px}
#a2a-hub .a2a-demo-chat p {padding:15px;border:1px solid var(--ah-border);border-radius:0 9px 9px 9px;background:var(--ah-surface);font-size:11px;line-height:1.9}
#a2a-hub .a2a-demo-result {display:flex;align-items:center;justify-content:center;gap:7px;font-size:10px;color:var(--ah-teal);margin-top:28px}
#a2a-hub .a2a-demo-result .a2a-icon {width:14px;height:14px}
#a2a-hub .a2a-guide-library {margin-top:36px}
#a2a-hub .a2a-guide-library .a2a-section-heading h2 {margin-top:5px;font-size:18px}
#a2a-hub .a2a-guide-library .a2a-search {width:250px}
#a2a-hub .a2a-guide-filters {display:flex;gap:7px;margin:19px 0 18px}
#a2a-hub .a2a-guide-filters button {padding:7px 12px;font-size:11px;border:1px solid transparent;border-radius:7px;color:var(--ah-muted)}
#a2a-hub .a2a-guide-filters button[aria-pressed=true] {background:var(--ah-surface);border-color:var(--ah-border);color:var(--ah-text);font-weight:600}
#a2a-hub .a2a-guide-grid {display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:13px}
#a2a-hub .a2a-guide-card {display:flex;flex-direction:column;padding:20px;border:1px solid var(--ah-border);border-radius:11px;background:var(--ah-surface);min-width:0}
#a2a-hub .a2a-guide-card:hover {border-color:var(--ah-accent);transform:translateY(-2px);box-shadow:0 5px 16px #06152b08}
#a2a-hub .a2a-guide-card-top {display:flex;align-items:center;justify-content:space-between;margin-bottom:17px}
#a2a-hub .a2a-guide-symbol {color:var(--ah-accent);background:var(--ah-tint);padding:8px;display:inline-flex;border-radius:8px}
#a2a-hub .a2a-guide-symbol .a2a-icon {width:16px;height:16px}
#a2a-hub .a2a-guide-card-top small {font-size:9px;color:var(--ah-muted)}
#a2a-hub .a2a-guide-card>strong {font-size:13px;font-weight:650;margin-bottom:8px}
#a2a-hub .a2a-guide-card>span:not(.a2a-guide-card-top):not(.a2a-guide-card-bottom) {font-size:11px;line-height:1.85;color:var(--ah-muted);flex:1}
#a2a-hub .a2a-guide-card-bottom {display:flex;align-items:center;justify-content:space-between;font-size:10px;color:var(--ah-accent);border-top:1px solid var(--ah-border);padding-top:12px;margin-top:18px}
#a2a-hub .a2a-guide-card-bottom .a2a-icon {width:14px;height:14px}
#a2a-hub .a2a-chapter-layout {display:grid;grid-template-columns:minmax(0,1fr) 225px;gap:32px;align-items:start}
#a2a-hub .a2a-chapter {background:var(--ah-surface);border:1px solid var(--ah-border);border-radius:13px;padding:32px;min-width:0}
#a2a-hub .a2a-chapter h1 {font-size:28px;margin:12px 0 13px}
#a2a-hub .a2a-chapter>p {font-size:13px;line-height:2.05;color:var(--ah-muted);margin:18px 0}
#a2a-hub .a2a-chapter .a2a-chapter-subtitle {font-size:15px;line-height:1.85;color:var(--ah-text);padding-bottom:22px;margin:0 0 23px;border-bottom:1px solid var(--ah-border)}
#a2a-hub .a2a-chapter>h2 {font-size:15px;margin:27px 0 15px}
#a2a-hub .a2a-instruction-steps {display:grid;gap:0;padding:0;list-style:none}
#a2a-hub .a2a-instruction-steps li {display:flex;gap:17px;position:relative;padding-bottom:23px}
#a2a-hub .a2a-instruction-steps li::before {content:'';position:absolute;left:15px;top:32px;bottom:0;width:1px;background:var(--ah-border)}
#a2a-hub .a2a-instruction-steps li:last-child::before {display:none}
#a2a-hub .a2a-instruction-steps li>span {width:31px;height:31px;flex:0 0 31px;display:grid;place-items:center;background:var(--ah-tint);color:var(--ah-accent);border-radius:9px;font-size:11px;font-weight:600}
#a2a-hub .a2a-instruction-steps p {font-size:13px;line-height:1.95;padding-top:2px;overflow-wrap:anywhere}
#a2a-hub .a2a-takeaway {display:flex;gap:12px;padding:20px;background:var(--ah-tint);border-left:3px solid var(--ah-accent);border-radius:0 9px 9px 0;margin:15px 0 23px}
#a2a-hub .a2a-takeaway>.a2a-icon {color:var(--ah-accent);width:17px;height:17px;margin-top:2px}
#a2a-hub .a2a-takeaway strong {font-size:12px;font-weight:650}
#a2a-hub .a2a-takeaway p {font-size:12px;line-height:1.9;color:var(--ah-muted);margin-top:5px}
#a2a-hub .a2a-next-chapter {width:100%;display:flex;align-items:center;justify-content:space-between;gap:10px;border-top:1px solid var(--ah-border);padding-top:22px;margin-top:30px;color:var(--ah-accent)}
#a2a-hub .a2a-next-chapter small {display:block;color:var(--ah-muted);font-size:10px;margin-bottom:4px}
#a2a-hub .a2a-next-chapter strong {font-size:13px;font-weight:600}
#a2a-hub .a2a-chapter-aside {position:sticky;top:0;padding-top:10px}
#a2a-hub .a2a-chapter-aside nav {display:grid;gap:2px}
#a2a-hub .a2a-chapter-aside nav button {display:flex;align-items:center;gap:9px;padding:9px 10px;font-size:11px;border-radius:7px;color:var(--ah-muted);line-height:1.6}
#a2a-hub .a2a-chapter-aside nav button>span {font-size:9px;opacity:.7;flex:0 0 13px}
#a2a-hub .a2a-chapter-aside nav button[aria-current=page] {background:var(--ah-tint);color:var(--ah-accent);font-weight:550}
#a2a-hub .a2a-help-note {margin-top:23px;padding:20px 0;border-top:1px solid var(--ah-border);color:var(--ah-muted)}
#a2a-hub .a2a-help-note>.a2a-icon {color:var(--ah-accent);margin-bottom:11px}
#a2a-hub .a2a-help-note h3 {font-size:12px;color:var(--ah-text);margin-bottom:7px}
#a2a-hub .a2a-help-note p {font-size:11px;line-height:1.9;margin-bottom:15px}
#a2a-hub .a2a-org-diagram {border:1px solid var(--ah-border);background:var(--ah-surface);border-radius:10px;margin-top:22px;padding:18px}
#a2a-hub .a2a-org-diagram>div {display:flex;align-items:center;gap:7px;font-size:10px;padding:9px;background:var(--ah-raised);border:1px solid var(--ah-border);border-radius:6px;flex-wrap:wrap}
#a2a-hub .a2a-org-diagram .a2a-icon {width:13px;height:13px;flex-basis:13px;color:var(--ah-muted)}
#a2a-hub .a2a-org-connector {display:block;height:15px;width:1px;background:var(--ah-border);margin-left:20px}
#a2a-hub .a2a-org-diagram>p {font-size:9px;color:var(--ah-muted);text-align:center;line-height:1.8;margin-top:15px}
#a2a-hub .a2a-org-diagram .a2a-badge {font-size:8px;padding:2px 4px}
#a2a-hub .a2a-chapter .a2a-demo {grid-template-columns:1fr;padding:20px}
#a2a-hub .a2a-chapter .a2a-demo-stage {min-height:220px}
#a2a-hub .a2a-error {display:flex;align-items:center;gap:11px;padding:14px 17px;margin-bottom:22px;border:1px solid color-mix(in srgb,var(--ah-danger) 32%,var(--ah-border));background:color-mix(in srgb,var(--ah-danger) 6%,var(--ah-surface));color:var(--ah-danger);border-radius:9px;font-size:12px}
#a2a-hub .a2a-error>span {flex:1}
#a2a-hub .a2a-error small {display:block;color:var(--ah-muted);font-size:10px;margin-top:4px}
#a2a-hub .a2a-loading {display:flex;align-items:center;gap:10px;color:var(--ah-muted);font-size:11px;padding:0 0 18px}
#a2a-hub .a2a-loading>span {width:13px;height:13px;border:2px solid var(--ah-border);border-top-color:var(--ah-accent);border-radius:50%;animation:a2a-spin .8s linear infinite}
@keyframes a2a-spin {to {transform:rotate(360deg)}}
@media (max-width:1250px) {
  #a2a-hub .a2a-shell {grid-template-columns:193px minmax(0,1fr)}
  #a2a-hub .a2a-main {padding:27px 27px 0}
  #a2a-hub .a2a-compose-layout {grid-template-columns:minmax(0,1fr) 200px;gap:18px}
  #a2a-hub .a2a-form-panel {padding:21px}
  #a2a-hub .a2a-chapter-layout {grid-template-columns:minmax(0,1fr) 200px;gap:21px}
  #a2a-hub .a2a-role-guide {grid-template-columns:180px minmax(0,1fr)}
  #a2a-hub .a2a-role-intro {padding:24px 20px}
  #a2a-hub .a2a-role-content {padding:23px 21px}
  #a2a-hub .a2a-role-tabs {gap:2px}
  #a2a-hub .a2a-role-tabs button {padding:7px;font-size:10px}
  #a2a-hub .a2a-welcome {padding:26px;gap:23px}
  #a2a-hub .a2a-welcome h2 {font-size:27px}
  #a2a-hub .a2a-stat-strip>button {padding:18px 17px;gap:10px}
  #a2a-hub .a2a-action-card {padding:18px}
  #a2a-hub .a2a-demo {padding:24px;gap:20px}
  #a2a-hub .a2a-demo-stage {padding:15px}
}
@media (max-width:1000px) {
  #a2a-hub {width:calc(100vw - 24px);height:calc(100dvh - 24px);border-radius:12px}
  #a2a-hub .a2a-shell {grid-template-columns:175px minmax(0,1fr)}
  #a2a-hub .a2a-main {padding:24px 22px 0}
  #a2a-hub .a2a-welcome {grid-template-columns:1fr}
  #a2a-hub .a2a-welcome .a2a-route-art {display:none}
  #a2a-hub .a2a-compose-layout,#a2a-hub .a2a-message-layout,#a2a-hub .a2a-chapter-layout {grid-template-columns:1fr}
  #a2a-hub .a2a-compose-aside:not(.a2a-review-aside) {display:none}
  #a2a-hub .a2a-review-aside {padding:18px}
  #a2a-hub .a2a-chapter-aside,#a2a-hub .a2a-message-aside {position:static;padding:16px;border:1px solid var(--ah-border);border-radius:10px}
  #a2a-hub .a2a-chapter-aside nav {grid-template-columns:1fr 1fr}
  #a2a-hub .a2a-role-guide {grid-template-columns:1fr}
  #a2a-hub .a2a-role-intro {padding:20px;border-right:0;border-bottom:1px solid var(--ah-border)}
  #a2a-hub .a2a-role-intro h2 {font-size:20px;margin:8px 0}
  #a2a-hub .a2a-role-intro br {display:none}
  #a2a-hub .a2a-guide-grid {grid-template-columns:1fr 1fr}
  #a2a-hub .a2a-demo {grid-template-columns:1fr}
  #a2a-hub .a2a-demo-stage {min-height:230px}
  #a2a-hub .a2a-stat-strip>button {padding:15px 12px}
  #a2a-hub .a2a-stat-strip .a2a-stat-icon {display:none}
  #a2a-hub .a2a-overview-bottom {grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce) {#a2a-hub * {transition:none;scroll-behavior:auto;animation:none}}

#a2a-hub .a2a-chapter-aside>.a2a-org-diagram:first-child {margin:0 0 22px}
/* 笔记本首屏先看见三个行动入口，次要记录继续向下阅读。 */
@media (max-height:900px) and (min-width:1001px) {
  #a2a-hub .a2a-overview {padding-top:22px}
  #a2a-hub .a2a-overview .a2a-page-heading {margin-bottom:18px}
  #a2a-hub .a2a-overview .a2a-page-heading h1 {font-size:25px;margin:5px 0}
  #a2a-hub .a2a-welcome {padding:19px 25px}
  #a2a-hub .a2a-welcome h2 {font-size:25px;line-height:1.3;margin:8px 0}
  #a2a-hub .a2a-welcome p {margin-bottom:9px;line-height:1.7}
  #a2a-hub .a2a-welcome p br {display:none}
  #a2a-hub .a2a-route-art {padding:15px 20px}
  #a2a-hub .a2a-route-chain {margin:16px 0}
  #a2a-hub .a2a-route-node>.a2a-icon {padding:10px}
  #a2a-hub .a2a-route-note {padding-top:9px}
  #a2a-hub .a2a-stat-strip {margin-top:13px}
  #a2a-hub .a2a-stat-strip>button {padding:13px 20px}
  #a2a-hub .a2a-overview .a2a-section {margin-top:20px}
  #a2a-hub .a2a-overview .a2a-section-heading {margin-bottom:12px}
  #a2a-hub .a2a-overview .a2a-action-card {padding:16px 18px 13px}
  #a2a-hub .a2a-overview .a2a-action-symbol {width:30px;height:30px;margin-bottom:8px}
  #a2a-hub .a2a-overview .a2a-action-copy strong {margin-bottom:5px}
  #a2a-hub .a2a-overview .a2a-action-bottom {margin-top:10px;padding-top:9px}
}