.hero{position:relative;padding:clamp(72px,11vw,144px) 24px clamp(48px,7vw,96px);text-align:center;overflow:hidden}.hero-eyebrow{display:inline-block;margin-bottom:24px;padding:4px 12px;border-radius:var(--radius-pill);background:var(--accent-soft);color:var(--accent);font-size:12px;font-weight:var(--weight-heavy);letter-spacing:var(--tracking-eyebrow);text-transform:uppercase}.hero-title{max-width:1000px;margin:0 auto;font-size:var(--text-display-xl);line-height:1.04;letter-spacing:-.02em;font-weight:var(--weight-semibold);text-wrap:balance;color:var(--fg)}.hero-intro{max-width:740px;margin:32px auto 0;color:var(--fg-muted);font-size:var(--text-lead);line-height:1.45;text-wrap:pretty}.hero-actions{display:inline-flex;align-items:center;gap:12px;margin-top:40px}.surfaces-section{padding:clamp(64px,9vw,120px) 0 clamp(56px,8vw,96px);text-align:center;border-top:1px solid var(--border);background:var(--bg-page)}.surfaces-title{font-size:clamp(32px,4vw,48px);font-weight:var(--weight-semibold);letter-spacing:-.02em;margin:0 auto;max-width:800px;color:var(--fg)}.surfaces-sub{margin:20px auto 0;max-width:640px;color:var(--fg-muted);font-size:var(--text-lead);line-height:1.45}.surfaces-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(20px,3vw,40px);margin:clamp(48px,7vw,80px) auto 0;max-width:900px}.surface-tile{display:flex;flex-direction:column;align-items:center;text-align:center;gap:12px;padding:16px;text-decoration:none;color:var(--accent);transition:transform .2s ease}.surface-tile:hover{transform:translateY(-2px)}.surface-icon{width:96px;height:96px;display:flex;align-items:center;justify-content:center;color:var(--accent)}.surface-label{font-size:22px;font-weight:var(--weight-semibold);letter-spacing:-.01em;color:var(--accent)}.playground-section{padding:clamp(48px,7vw,96px) 0}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}.reader-playground{position:relative;overflow:visible;border:1px solid var(--border);border-radius:var(--radius-reader);background:var(--bg-soft);box-shadow:var(--shadow-sheet);transition:background-color .2s ease,border-color .2s ease}.demo-toolbar{display:flex;align-items:center;flex-wrap:wrap;gap:12px;padding:10px clamp(14px,2vw,20px);border-bottom:1px solid var(--border);background:var(--surface);color:var(--fg);border-radius:var(--radius-reader) var(--radius-reader) 0 0}.demo-toolbar strong{min-width:220px;flex:1 1 240px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:16px;color:var(--fg)}.demo-toolbar>span{color:var(--fg-muted);font-size:13px;white-space:nowrap}.demo-toolbar button,.demo-toolbar a#demo-settings{display:inline-flex;min-height:34px;height:34px;align-items:center;justify-content:center;border:1px solid var(--border);border-radius:var(--radius-control);padding:0 14px;background:var(--surface);color:var(--fg);font-weight:700;line-height:1;cursor:pointer;white-space:nowrap;text-decoration:none;font-family:inherit}.demo-toolbar button:hover:not([aria-pressed=true]):not(#demo-done){background:var(--accent-soft);border-color:var(--accent);color:var(--accent)}.demo-toolbar button[aria-pressed=true],.demo-toolbar a#demo-settings:focus-visible{border-color:var(--accent);background:var(--accent-soft);color:var(--accent);outline:0;box-shadow:inset 0 0 0 1px var(--accent)}.demo-toolbar #demo-done{border-color:var(--accent);background:var(--accent);color:var(--on-accent)}.demo-toolbar #demo-done:hover{background:var(--accent-hover);border-color:var(--accent-hover);color:var(--on-accent)}.demo-appearance{position:relative}#demo-appearance-button{align-items:center;justify-content:center;gap:2px;width:56px;padding:0}#demo-appearance-button span{display:inline-flex;align-items:center;color:inherit;font-size:13px;line-height:1}#demo-appearance-button strong{display:inline-flex;align-items:center;min-width:auto;flex:initial;color:inherit;font-size:18px;line-height:1}#demo-settings{width:40px;min-width:40px;padding:0}#demo-settings svg{display:block}.demo-appearance-panel{position:absolute;top:calc(100% + 8px);right:0;z-index:4;display:grid;width:286px;gap:12px;border:1px solid var(--demo-panel-border, var(--border));border-radius:var(--radius-reader);padding:14px;background:var(--demo-panel-bg, var(--surface));color:var(--demo-panel-fg, var(--fg));box-shadow:var(--shadow-popover)}.demo-scale-row,.demo-control-block{display:flex;align-items:center;gap:8px}.demo-scale-row button,.demo-control-block button{min-height:36px;flex:1;border:1px solid var(--demo-panel-border, var(--border));border-radius:var(--radius-control);background:transparent;color:inherit;font-size:13px;cursor:pointer;font-family:inherit}.demo-scale-row output{min-width:48px;color:var(--demo-panel-fg, var(--fg));text-align:center;font-size:12px;font-weight:700}.demo-control-block:not(.demo-theme-swatches) button[aria-pressed=true]{border-color:var(--accent);background:var(--accent-soft);color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent)}.demo-theme-swatches button[aria-pressed=true]{border-color:var(--accent);box-shadow:0 0 0 2px var(--accent),0 0 0 4px var(--accent-soft)}.demo-theme-swatches{flex-wrap:wrap}.demo-theme-swatches button{flex:1 1 calc(20% - 8px);min-width:38px}.demo-theme-swatches button[data-demo-theme=system]{background:linear-gradient(135deg,#fff 0% 50%,#15171b 50% 100%);color:#6db1ff}.demo-theme-swatches button[data-demo-theme=white]{background:#fff;color:#1d1d1f}.demo-theme-swatches button[data-demo-theme=sepia]{background:#fbf1e3;color:#3a2f24}.demo-theme-swatches button[data-demo-theme=gray]{background:#34373c;color:#e3e3e6}.demo-theme-swatches button[data-demo-theme=black]{background:#000;color:#d6d6d8}.demo-font-grid{flex-wrap:wrap}.demo-font-grid button{flex:1 1 calc(33.333% - 6px);min-width:0;font-size:12px}.demo-segment{display:flex;flex-wrap:wrap;gap:8px}.demo-stage{--demo-scale: 1;--demo-bg: #2a2c2e;--demo-tile: #34373c;--demo-border: #4a4d53;--demo-fg: #e3e3e6;--demo-muted: #9b9da1;--demo-avatar: var(--accent);--demo-panel-bg: #34373c;--demo-panel-fg: #e3e3e6;--demo-panel-border: #4a4d53;display:grid;gap:16px;padding:clamp(18px,3vw,28px);background:var(--demo-bg);color:var(--demo-fg);font-size:calc(16px * var(--demo-scale));border-radius:0 0 var(--radius-reader) var(--radius-reader);transition:background-color .16s ease,color .16s ease}.demo-stage.demo-theme-system{--demo-bg: #eef0f3;--demo-tile: #ffffff;--demo-border: #dfe2e8;--demo-fg: #1d1d1f;--demo-muted: #6b6b70;--demo-avatar: var(--accent);--demo-panel-bg: #ffffff;--demo-panel-fg: #1d1d1f;--demo-panel-border: #dfe2e8}@media (prefers-color-scheme: dark){.demo-stage.demo-theme-system{--demo-bg: #1f2123;--demo-tile: #34373c;--demo-border: #4a4d53;--demo-fg: #e3e3e6;--demo-muted: #a4a6ab;--demo-avatar: var(--accent);--demo-panel-bg: #34373c;--demo-panel-fg: #e3e3e6;--demo-panel-border: #4a4d53}}.demo-stage.demo-theme-white{--demo-bg: #eef0f3;--demo-tile: #ffffff;--demo-border: #dfe2e8;--demo-fg: #1d1d1f;--demo-muted: #6b6b70;--demo-avatar: var(--accent);--demo-panel-bg: #ffffff;--demo-panel-fg: #1d1d1f;--demo-panel-border: #dfe2e8}.demo-stage.demo-theme-sepia{--demo-bg: #ebdcc4;--demo-tile: #fbf1e3;--demo-border: #d7c5ab;--demo-fg: #3a2f24;--demo-muted: #7a6553;--demo-avatar: #8b4f1f;--demo-panel-bg: #fbf1e3;--demo-panel-fg: #3a2f24;--demo-panel-border: #d7c5ab}.demo-stage.demo-theme-gray{--demo-bg: #1f2123;--demo-tile: #34373c;--demo-border: #4a4d53;--demo-fg: #e3e3e6;--demo-muted: #a4a6ab;--demo-avatar: var(--accent);--demo-panel-bg: #34373c;--demo-panel-fg: #e3e3e6;--demo-panel-border: #4a4d53}.demo-stage.demo-theme-black{--demo-bg: #000000;--demo-tile: #15171b;--demo-border: #2a2d33;--demo-fg: #d6d6d8;--demo-muted: #8a8a90;--demo-avatar: var(--accent);--demo-panel-bg: #15171b;--demo-panel-fg: #d6d6d8;--demo-panel-border: #2a2d33}.reader-playground:has(.demo-theme-system){--demo-panel-bg: #ffffff;--demo-panel-fg: #1d1d1f;--demo-panel-border: #dfe2e8}@media (prefers-color-scheme: dark){.reader-playground:has(.demo-theme-system){--demo-panel-bg: #34373c;--demo-panel-fg: #e3e3e6;--demo-panel-border: #4a4d53}}.reader-playground:has(.demo-theme-white){--demo-panel-bg: #ffffff;--demo-panel-fg: #1d1d1f;--demo-panel-border: #dfe2e8}.reader-playground:has(.demo-theme-sepia){--demo-panel-bg: #fbf1e3;--demo-panel-fg: #3a2f24;--demo-panel-border: #d7c5ab}.reader-playground:has(.demo-theme-gray){--demo-panel-bg: #34373c;--demo-panel-fg: #e3e3e6;--demo-panel-border: #4a4d53}.reader-playground:has(.demo-theme-black){--demo-panel-bg: #15171b;--demo-panel-fg: #d6d6d8;--demo-panel-border: #2a2d33}.demo-stage.demo-compact{grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.demo-stage.demo-compact .thread-card{padding:12px 14px}.demo-stage.demo-compact .thread-card h2{font-size:calc(17px * var(--demo-scale))}.demo-stage.demo-compact .thread-card-header p,.demo-stage.demo-compact .thread-card>p{display:none}.demo-stage.demo-expanded{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.demo-stage.demo-expanded .thread-card:nth-child(3){grid-column:1 / -1}.demo-stage.demo-full{grid-template-columns:1fr;gap:14px}.demo-stage.demo-full .thread-card{width:min(100%,720px);margin:0 auto}.demo-stage.demo-mode-timeline{grid-template-columns:1fr}.demo-stage.demo-mode-timeline .thread-card{position:relative;width:min(100%,720px);margin:0 auto}.demo-stage.demo-mode-timeline .thread-card:before{content:"";position:absolute;top:-18px;bottom:-18px;left:37px;width:2px;background:var(--demo-avatar);border-radius:2px}.demo-stage.demo-mode-timeline .thread-card:first-child:before{top:37px}.demo-stage.demo-mode-timeline .thread-card:last-child:before{bottom:100%}.demo-stage.demo-mode-threaded{grid-template-columns:1fr}.demo-stage.demo-mode-threaded .thread-card{position:relative;width:min(100%,720px);margin-right:auto;margin-left:calc(var(--thread-indent, 0) * 34px)}.demo-stage.demo-mode-threaded .thread-card:nth-child(2){--thread-indent: 1}.demo-stage.demo-mode-threaded .thread-card:nth-child(3){--thread-indent: 2}.demo-stage.demo-full.demo-mode-threaded .thread-card:not(:first-child):before{content:"";position:absolute;left:-34px;top:-14px;width:34px;height:14px;border-left:3px solid var(--accent);border-bottom:3px solid var(--accent);border-bottom-left-radius:8px}.demo-stage.demo-full.demo-mode-threaded .thread-card:not(:first-child):after{content:"";position:absolute;left:-5px;top:-5px;width:8px;height:8px;background:var(--accent);border-radius:50%}.demo-stage.demo-compact.demo-mode-timeline,.demo-stage.demo-compact.demo-mode-threaded{grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.demo-stage.demo-compact.demo-mode-timeline .thread-card,.demo-stage.demo-compact.demo-mode-threaded .thread-card{width:auto;margin:0;padding:12px 14px}.demo-stage.demo-compact.demo-mode-timeline .thread-card:before{display:none}.demo-stage.demo-compact.demo-mode-threaded .thread-card{position:relative}.demo-stage.demo-compact.demo-mode-threaded .thread-card:nth-child(2){margin-top:14px}.demo-stage.demo-compact.demo-mode-threaded .thread-card:nth-child(3){margin-top:28px}.demo-stage.demo-compact.demo-mode-threaded .thread-card:not(:first-child):before{content:"";position:absolute;left:-10px;top:-14px;width:10px;height:14px;border-top:2px solid var(--accent);border-right:2px solid var(--accent);border-top-right-radius:6px}.demo-stage.demo-expanded.demo-mode-timeline,.demo-stage.demo-expanded.demo-mode-threaded{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.demo-stage.demo-expanded.demo-mode-timeline .thread-card:nth-child(3),.demo-stage.demo-expanded.demo-mode-threaded .thread-card:nth-child(3){grid-column:1 / -1}.demo-stage.demo-expanded.demo-mode-timeline .thread-card,.demo-stage.demo-expanded.demo-mode-threaded .thread-card{width:auto;margin:0}.demo-stage.demo-expanded.demo-mode-timeline .thread-card:before{display:none}.demo-stage.demo-expanded.demo-mode-threaded .thread-card{position:relative}.demo-stage.demo-expanded.demo-mode-threaded .thread-card:nth-child(2){margin-top:12px}.demo-stage.demo-expanded.demo-mode-threaded .thread-card:nth-child(3){margin-top:12px}.demo-stage.demo-expanded.demo-mode-threaded .thread-card:nth-child(2):before{content:"";position:absolute;left:-16px;top:-12px;width:16px;height:12px;border-top:2px solid var(--accent);border-right:2px solid var(--accent);border-top-right-radius:6px}.demo-stage.demo-expanded.demo-mode-threaded .thread-card:nth-child(3):before{content:"";position:absolute;left:22px;top:-12px;width:2px;height:12px;background:var(--accent);border-radius:2px}.thread-card{border:1px solid var(--demo-border);border-radius:var(--radius-reader);background:var(--demo-tile);padding:18px;box-shadow:0 12px 26px #0f172a14}.thread-card-header{display:flex;align-items:center;gap:12px;margin-bottom:12px}.thread-card-header>div{min-width:0;flex:1}.thread-time{display:none;margin-left:auto;color:var(--demo-muted);font-size:calc(13px * var(--demo-scale));white-space:nowrap}.demo-stage.demo-mode-timeline .thread-time{display:inline-flex}.avatar{display:inline-flex;width:38px;height:38px;flex:0 0 38px;align-items:center;justify-content:center;border-radius:999px;background:var(--demo-avatar);color:var(--on-accent);font-weight:900}.thread-card h2,.thread-card p{margin:0}.thread-card h2{font-size:calc(20px * var(--demo-scale));line-height:1.18;color:var(--demo-fg)}.thread-card-header p{color:var(--demo-muted);font-size:calc(13px * var(--demo-scale))}.thread-card>p{color:var(--demo-muted)}.demo-stage.demo-font-sans{font-family:var(--font-sans)}.demo-stage.demo-font-humanist{font-family:Aptos,Candara,Segoe UI,Frutiger,Gill Sans,Trebuchet MS,system-ui,sans-serif}.demo-stage.demo-font-rounded{font-family:ui-rounded,SF Pro Rounded,Arial Rounded MT Bold,Nunito Sans,system-ui,sans-serif}.demo-stage.demo-font-serif{font-family:var(--font-serif)}.demo-stage.demo-font-old-style{font-family:Iowan Old Style,Palatino Linotype,Palatino,Book Antiqua,Georgia,serif}.demo-stage.demo-font-news{font-family:Georgia,Times New Roman,Times,Charter,New York,serif}.demo-stage.demo-font-slab{font-family:Rockwell,Roboto Slab,Egyptian Slate,Courier New,serif}.demo-stage.demo-font-mono{font-family:var(--font-mono)}.demo-stage.demo-font-cursive{font-family:Bradley Hand,Segoe Print,Comic Sans MS,Apple Chancery,cursive}.demo-stage.demo-original{--demo-bg: #f4f6f9;--demo-tile: #ffffff;--demo-border: #dfe2e8;--demo-fg: #1d1d1f;--demo-muted: #5f6368;--demo-avatar: #edf2f7;grid-template-columns:repeat(3,minmax(0,1fr))!important;gap:14px;padding:clamp(18px,3vw,28px)}.demo-stage.demo-original .thread-card{width:auto;margin:0;box-shadow:none;border:1px solid var(--demo-border);border-radius:12px;padding:16px;grid-column:auto!important}.demo-stage.demo-original .thread-card h2{font-size:calc(20px * var(--demo-scale))}.demo-stage.demo-original .thread-card-header p,.demo-stage.demo-original .thread-card>p{display:block}.demo-stage.demo-original .thread-card-header{align-items:flex-start;margin-bottom:8px}.demo-stage.demo-original .avatar{display:none}.demo-stage.demo-original .thread-card:before{display:none!important}.demo-stage.demo-original .thread-time{display:none}.download-section{padding:clamp(48px,7vw,96px) 0;background:var(--bg-page);border-top:1px solid var(--border);scroll-margin-top:120px}.download-section h2{margin:0 0 16px;font-size:clamp(36px,4.4vw,52px);line-height:1.1;letter-spacing:-.02em;font-weight:var(--weight-semibold);color:var(--fg)}.download-section p.muted{color:var(--fg-muted);font-size:var(--text-lead);max-width:720px}.download-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin-top:36px}.download-card{display:grid;gap:6px;min-height:120px;align-content:start;border:1px solid var(--border-strong);border-radius:var(--radius-reader);padding:22px;color:var(--fg);text-decoration:none;background:var(--surface);transition:background-color .14s ease,border-color .14s ease,transform .14s ease}.download-card:hover:not(.disabled){transform:translateY(-2px)}.download-card strong{font-size:17px;font-weight:var(--weight-semibold)}.download-card span{color:var(--fg-muted);font-size:14px}.download-card.disabled{border-style:dashed;color:var(--fg-muted);cursor:not-allowed;background:transparent}.download-card.recommended{border-color:var(--accent);box-shadow:0 0 0 2px color-mix(in srgb,var(--accent) 28%,transparent)}.download-card.recommended:hover{background:var(--accent-soft)}@media (max-width: 760px){.surfaces-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(8px,2.4vw,18px);max-width:none;padding:0 4px}.surface-tile{padding:4px;gap:8px}.surface-icon{width:clamp(48px,14vw,72px);height:clamp(48px,14vw,72px)}.surface-icon svg{width:100%;height:100%}.surface-label{font-size:clamp(15px,4vw,18px)}}@media (max-width: 720px){.hero{padding-left:20px;padding-right:20px;padding-top:clamp(48px,11vw,80px);padding-bottom:clamp(32px,6vw,56px)}.hero-title{font-size:clamp(36px,9vw,48px)}.hero-intro{font-size:17px;margin-top:20px}.hero-actions{flex-direction:column;align-items:stretch;gap:10px;margin-top:28px;width:100%;max-width:320px;margin-left:auto;margin-right:auto}.hero-actions .button-primary,.hero-actions .button-secondary{width:100%;min-height:48px}.download-grid{grid-template-columns:1fr}.demo-toolbar{padding:10px 14px;gap:8px;row-gap:8px}.demo-toolbar strong{font-size:15px;flex:1 1 100%;min-width:0}.demo-toolbar>span{display:none}.demo-toolbar .demo-appearance{order:1;flex:0 0 auto}.demo-toolbar a#demo-settings{order:2;flex:0 0 auto}.demo-segment{order:3;flex:1 1 100%;display:grid;grid-template-columns:repeat(3,1fr);gap:6px}.demo-segment button{width:100%;padding:0 8px}.demo-toolbar #demo-original,.demo-toolbar #demo-done{order:4;flex:1 1 calc(50% - 4px)}.demo-stage.demo-compact,.demo-stage.demo-compact.demo-mode-timeline,.demo-stage.demo-compact.demo-mode-threaded,.demo-stage.demo-expanded,.demo-stage.demo-expanded.demo-mode-timeline,.demo-stage.demo-expanded.demo-mode-threaded,.demo-stage.demo-original{grid-template-columns:1fr!important}.demo-stage.demo-expanded .thread-card:nth-of-type(3){grid-column:auto}.demo-stage.demo-full .thread-card{width:100%}.demo-stage.demo-compact.demo-mode-threaded .thread-card:nth-child(2),.demo-stage.demo-compact.demo-mode-threaded .thread-card:nth-child(3),.demo-stage.demo-expanded.demo-mode-threaded .thread-card:nth-child(2),.demo-stage.demo-expanded.demo-mode-threaded .thread-card:nth-child(3){margin-top:0}.demo-stage.demo-compact.demo-mode-threaded .thread-card:not(:first-child):before,.demo-stage.demo-expanded.demo-mode-threaded .thread-card:nth-child(2):before,.demo-stage.demo-expanded.demo-mode-threaded .thread-card:nth-child(3):before{display:none}.demo-appearance-panel{width:min(286px,calc(100vw - 32px));right:-8px}}