@font-face{font-family:Eastudy Sans;src:url(/assets/auth/fonts/auth-sans.woff2) format("woff2");font-weight:100 900;font-style:normal;font-display:swap}@font-face{font-family:"Eastudy Serif";src:url(/assets/auth/fonts/auth-serif.woff2) format("woff2");font-weight:200 900;font-style:normal;font-display:swap}:root{--text-xs: 12px;--text-sm: 13px;--text-base: 15px;--text-lg: 17px;--text-xl: 21px;--text-2xl: 27px;--text-3xl: 34px;--leading-tight: 1.25;--leading-normal: 1.55;--leading-relaxed: 1.75;--font-mono: "SFMono-Regular", "JetBrains Mono", Consolas, "Liberation Mono", monospace;--font-serif: "Eastudy UI Serif", Georgia, "Microsoft YaHei", serif;--font-sans: Arial, "Eastudy Sans", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;--font-read: "Times New Roman", "Eastudy Serif", "Songti SC", Georgia, serif;--radius-xs: 8px;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 16px;--radius-pill: 999px;--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 24px;--space-6: 32px;--space-7: 48px;--space-8: 64px;--ease: cubic-bezier(.32, .72, 0, 1);--dur-fast: .12s;--dur-base: .2s;--dur-slow: .32s;--dur-theme: .16s;--motion: var(--dur-base);--motion-fast: var(--dur-fast);--motion-slow: var(--dur-slow);--sidebar-w: 250px;--topbar-h: 58px;--tap-min: 44px}:root{--font-ui: var(--font-sans);--font-body:16px;--font-page:28px;--font-section:20px;--font-card:16px;--font-note:14px;--font-meta:12px;--leading-title:1.35;--leading-body:1.65;--leading-note:1.6;--radius-control:8px;--radius-card:12px;--radius-layer:16px;--radius-chip:6px;--gap-1:4px;--gap-2:8px;--gap-3:12px;--gap-4:16px;--gap-6:24px;--gap-8:32px;--gap-12:48px;--card-pad:24px;--control-height:44px;--chip-height:24px;--icon-size:20px;--text-secondary:color-mix(in srgb,var(--fg-subtle) 65%,var(--fg-base));--teaching-readable:color-mix(in srgb,var(--teach-key-fg) 68%,var(--fg-base));--selection-ink:color-mix(in srgb,var(--primary) 65%,var(--fg-base));--action-fill:var(--primary);--action-hover:color-mix(in srgb,var(--primary) 96%,#fff);--control-border:color-mix(in srgb,var(--border-base) 50%,var(--fg-base));--selected-bg:color-mix(in srgb,var(--primary) 12%,var(--card-bg));--surface-shadow:0 2px 10px color-mix(in srgb,var(--fg-base) 4%,transparent);--layer-shadow:0 16px 48px color-mix(in srgb,var(--page-bg) 40%,#00000040);--motion-ui:.16s;--ease-ui:cubic-bezier(.2,.7,.2,1);--material-surface-top:color-mix(in srgb,var(--card-bg) 97%,#fff);--material-surface-bottom:color-mix(in srgb,var(--card-bg) 85%,var(--panel-bg));--material-highlight:rgba(255,255,255,.55);--material-reflection:rgba(255,255,255,.065);--material-secondary:color-mix(in srgb,var(--text-secondary) 80%,var(--fg-base));--material-contact:0 2px 4px #0b17261a;--material-elevation:0 10px 28px #0b172614;--card-text-secondary:color-mix(in srgb,var(--fg-subtle) 25%,var(--fg-base));--card-surface-top:color-mix(in srgb,var(--card-bg) 93%,var(--primary));--card-surface-bottom:color-mix(in srgb,var(--card-bg) 96%,var(--panel-bg));--card-surface-reflection:rgba(255,255,255,.58);--card-surface-ambient:color-mix(in srgb,var(--primary) 18%,transparent);--card-surface-face:radial-gradient(ellipse 85% 65% at 12% 0%,var(--card-surface-reflection),transparent 70%),radial-gradient(ellipse 130% 110% at 8% 110%,var(--card-surface-ambient),transparent 70%),linear-gradient(135deg,var(--card-surface-top),var(--card-surface-bottom) 75%);--card-edge:color-mix(in srgb,var(--border-base) 86%,var(--fg-base));--card-edge-light:color-mix(in srgb,var(--primary) 30%,var(--card-edge));--card-surface-shadow:inset 0 1px 0 #ffffffa6,inset 1px 0 0 #ffffff33,0 3px 6px #0b172612,0 12px 24px -10px #0b172630,0 0 16px -9px color-mix(in srgb,var(--primary) 18%,transparent);--material-layer-shadow:0 16px 40px #0b172624;--material-button-top:var(--action-fill);--material-button-mid:color-mix(in srgb,var(--action-fill) 91%,#000);--material-button-bottom:color-mix(in srgb,var(--action-fill) 72%,#000);--material-button-shadow:0 8px 18px -6px color-mix(in srgb,var(--primary) 38%,transparent),0 2px 4px #0b172626;--material-control-top:color-mix(in srgb,var(--card-bg) 92%,transparent);--material-control-bottom:color-mix(in srgb,var(--panel-bg) 94%,transparent);--material-control-face:linear-gradient(155deg,var(--material-control-top),var(--material-control-bottom));--material-selected-face:linear-gradient(155deg,color-mix(in srgb,var(--selected-bg) 94%,#fff),var(--selected-bg));--material-control-edge:color-mix(in srgb,var(--primary) 18%,var(--border-base));--material-control-shadow:inset 0 1px 0 var(--material-highlight),0 2px 6px #0b172614;--material-control-blur:8px;--word-surface-recess:inset 0 10px 18px -14px #0b172638,inset 0 3px 6px -5px #0b172626;--word-surface-edge:inset 0 1px 0 var(--material-highlight),inset 0 -1px 0 #ffffff33;--skeleton-base:color-mix(in srgb,var(--fg-base) 9%,var(--card-bg));--skeleton-shine:color-mix(in srgb,var(--fg-base) 4%,var(--card-bg));--tag-sage-bg:#d8f5df;--tag-sage-fg:#196237;--tag-teal-bg:#cff4f1;--tag-teal-fg:#115c62;--tag-blue-bg:#dae9ff;--tag-blue-fg:#244f96;--tag-violet-bg:#ece0ff;--tag-violet-fg:#643394;--tag-amber-bg:#ffeabd;--tag-amber-fg:#795019;--tag-rose-bg:#ffe0eb;--tag-rose-fg:#903357}html[data-mode=light]{--action-fill:color-mix(in srgb,var(--primary) 97%,#000);--action-hover:color-mix(in srgb,var(--primary) 92%,#000)}html[data-mode=dark]{--tag-sage-bg:#1c4230;--tag-sage-fg:#a6e9c0;--tag-teal-bg:#163f45;--tag-teal-fg:#a4e6e6;--tag-blue-bg:#243a5a;--tag-blue-fg:#b3d3ff;--tag-violet-bg:#3f2d59;--tag-violet-fg:#d8b8ff;--tag-amber-bg:#4d3a20;--tag-amber-fg:#ffe0a4;--tag-rose-bg:#512f43;--tag-rose-fg:#ffc1dd;--material-surface-top:color-mix(in srgb,var(--card-bg) 94%,#fff);--material-surface-bottom:color-mix(in srgb,var(--card-bg) 95%,#000);--material-highlight:rgba(255,255,255,.18);--material-reflection:rgba(255,255,255,.055);--material-contact:0 2px 4px #00000040;--material-elevation:0 10px 28px #00000038;--card-surface-top:color-mix(in srgb,var(--card-bg) 92%,var(--primary));--card-surface-bottom:color-mix(in srgb,var(--card-bg) 98%,#000);--card-surface-reflection:rgba(255,255,255,.065);--card-surface-ambient:color-mix(in srgb,var(--primary) 24%,transparent);--card-edge:color-mix(in srgb,var(--border-base) 75%,var(--fg-base));--card-edge-light:color-mix(in srgb,var(--primary) 30%,var(--card-edge));--card-surface-shadow:inset 0 1px 0 #ffffff24,inset 1px 0 0 #ffffff08,0 3px 6px #00000030,0 12px 24px -10px #00000070,0 0 16px -9px color-mix(in srgb,var(--primary) 24%,transparent);--material-layer-shadow:0 16px 40px #00000055;--material-button-top:color-mix(in srgb,var(--action-fill) 90%,#fff);--material-button-mid:var(--action-fill);--material-button-bottom:color-mix(in srgb,var(--action-fill) 88%,#000);--material-control-top:color-mix(in srgb,var(--material-surface-top) 90%,transparent);--material-control-bottom:color-mix(in srgb,var(--panel-bg) 96%,transparent);--material-control-shadow:inset 0 1px 0 var(--material-highlight),0 2px 6px #00000026;--word-surface-recess:inset 0 10px 18px -14px #00000066,inset 0 3px 6px -5px #00000040;--word-surface-edge:inset 0 1px 0 var(--material-highlight),inset 0 -1px 0 #ffffff0a}@media (max-width:640px){:root{--font-page:24px;--card-pad:16px}}@media (prefers-reduced-motion:reduce){:root{--motion-ui:0ms}html{scroll-behavior:auto!important}}:root{--tag-topic-face-lightness:89%;--tag-topic-ink-lightness:22%;--tag-topic-face-saturation:72%;--tag-topic-ink-saturation:60%}html[data-mode=dark]{--tag-topic-face-lightness:22%;--tag-topic-ink-lightness:86%}