:root {
    color-scheme: light;
    --snap-bg: #f5f6f7;
    --snap-surface: #ffffff;
    --snap-surface-soft: #eef0f2;
    --snap-text: #181b20;
    --snap-muted: #66707c;
    --snap-faint: #8d96a0;
    --snap-line: #dce0e4;
    --snap-line-strong: #c7cdd3;
    --snap-accent: #315f83;
    --snap-accent-soft: rgba(49, 95, 131, .09);
    --snap-code: #111824;
    --snap-code-text: #e9eef5;
    --snap-header: rgba(245, 246, 247, .92);
    --snap-shadow: 0 18px 50px rgba(26, 37, 48, .07);
    --snap-radius: 12px;
    --snap-fast: 160ms ease;
    --snap-motion: 320ms cubic-bezier(.22, 1, .36, 1);
    --snap-reading: 45rem;
    font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

[data-theme="dark"] {
    color-scheme: dark;
    --snap-bg: #0b0d10;
    --snap-surface: #12151a;
    --snap-surface-soft: #181c22;
    --snap-text: #e8ebef;
    --snap-muted: #a0a8b2;
    --snap-faint: #707985;
    --snap-line: #282e36;
    --snap-line-strong: #3a424c;
    --snap-accent: #8bb3d1;
    --snap-accent-soft: rgba(139, 179, 209, .1);
    --snap-code: #080b10;
    --snap-code-text: #e2e8f0;
    --snap-header: rgba(11, 13, 16, .92);
    --snap-shadow: 0 22px 58px rgba(0, 0, 0, .28);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--snap-bg); }
body { margin: 0; min-width: 0; min-height: 100vh; background: var(--snap-bg); color: var(--snap-text); font-size: 16px; line-height: 1.65; transition: background var(--snap-motion), color var(--snap-motion); }
button, input, select { font: inherit; }
button, select { cursor: pointer; }
button:disabled { cursor: not-allowed; opacity: .55; }
[hidden] { display: none !important; }

a { color: var(--snap-accent); text-decoration-thickness: .08em; text-underline-offset: .22em; text-decoration-color: color-mix(in srgb, var(--snap-accent) 48%, transparent); transition: color var(--snap-fast), text-decoration-color var(--snap-fast), background var(--snap-fast); }
a:visited { color: color-mix(in srgb, var(--snap-accent) 78%, var(--snap-muted)); }
a:hover { color: var(--snap-text); text-decoration-color: currentColor; }
a:active { color: var(--snap-accent); }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible { outline: 2px solid var(--snap-accent); outline-offset: 3px; }

.snap-header {
    position: sticky; top: 0; z-index: 50; min-height: 58px; padding: 0 max(18px, env(safe-area-inset-right)) 0 max(18px, env(safe-area-inset-left));
    display: flex; align-items: center; justify-content: space-between; gap: 16px;
    background: var(--snap-header); border-bottom: 1px solid var(--snap-line);
    -webkit-backdrop-filter: blur(14px) saturate(115%); backdrop-filter: blur(14px) saturate(115%);
}
.snap-brand { display: inline-flex; align-items: baseline; gap: 7px; color: var(--snap-text); font-family: Georgia, "Times New Roman", serif; font-size: 1.08rem; font-weight: 700; text-decoration: none; letter-spacing: .01em; }
.snap-brand:visited { color: var(--snap-text); }
.snap-brand span { font-size: 1.4em; font-style: italic; }
.snap-controls { display: flex; align-items: center; gap: 8px; }
.snap-control, .snap-return {
    min-width: 38px; min-height: 38px; display: inline-grid; place-items: center; border: 1px solid var(--snap-line); border-radius: 999px;
    background: var(--snap-surface); color: var(--snap-text); text-decoration: none; font-size: .76rem; font-weight: 650;
}
.snap-control:hover, .snap-return:hover { background: var(--snap-surface-soft); border-color: var(--snap-line-strong); color: var(--snap-text); }
.snap-return { padding: 0 14px; }

.snap-app { min-height: calc(100vh - 116px); }
.snap-state { width: min(100% - 36px, 42rem); min-height: calc(100vh - 116px); margin: 0 auto; display: flex; flex-direction: column; justify-content: center; align-items: flex-start; padding: 72px 0; }
.snap-state--loading { align-items: center; text-align: center; color: var(--snap-muted); }
.snap-state-label, .snap-kicker { margin: 0 0 14px; color: var(--snap-faint); font-size: .7rem; line-height: 1.2; font-weight: 750; letter-spacing: .16em; text-transform: uppercase; }
.snap-state h1 { margin: 0; font-family: Georgia, "Times New Roman", serif; font-size: clamp(2rem, 6vw, 3.6rem); line-height: 1.08; letter-spacing: -.025em; }
.snap-state > p:not(.snap-state-label) { max-width: 34rem; margin: 18px 0 28px; color: var(--snap-muted); }
.snap-trace { width: 28px; height: 28px; border: 1px solid var(--snap-line-strong); border-top-color: var(--snap-accent); border-radius: 50%; animation: snap-spin 800ms linear infinite; }
.snap-primary-link, .snap-secondary-button, .snap-submit {
    min-height: 44px; display: inline-flex; align-items: center; justify-content: center; padding: 0 18px;
    border: 1px solid var(--snap-text); border-radius: 8px; background: var(--snap-text); color: var(--snap-bg);
    text-decoration: none; font-weight: 700; font-size: .86rem; transition: transform var(--snap-fast), opacity var(--snap-fast), background var(--snap-fast);
}
.snap-primary-link:visited { color: var(--snap-bg); }
.snap-primary-link:hover, .snap-submit:hover { color: var(--snap-bg); opacity: .86; transform: translateY(-1px); }

.snap-document { width: min(100% - 40px, 74rem); margin: 0 auto; padding: clamp(48px, 8vw, 92px) 0 80px; display: grid; grid-template-columns: minmax(10rem, 13rem) minmax(0, var(--snap-reading)); justify-content: center; gap: clamp(42px, 6vw, 84px); align-items: start; }
.snap-toc { position: sticky; top: 90px; min-width: 0; max-height: calc(100vh - 120px); }
.snap-toc-label { margin: 0 0 13px; color: var(--snap-faint); font-size: .67rem; font-weight: 750; letter-spacing: .14em; text-transform: uppercase; }
.snap-toc nav { min-width: 0; max-height: calc(100vh - 155px); overflow-y: auto; padding: 0 10px 0 0; scrollbar-width: thin; scrollbar-color: color-mix(in srgb, var(--snap-muted) 35%, transparent) transparent; }
.snap-toc nav::-webkit-scrollbar, .snap-toc-sheet nav::-webkit-scrollbar { width: 4px; height: 0; }
.snap-toc nav::-webkit-scrollbar-track, .snap-toc-sheet nav::-webkit-scrollbar-track { background: transparent; }
.snap-toc nav::-webkit-scrollbar-thumb, .snap-toc-sheet nav::-webkit-scrollbar-thumb { background: color-mix(in srgb, var(--snap-muted) 34%, transparent); border-radius: 99px; }
.snap-toc nav::-webkit-scrollbar-thumb:hover, .snap-toc-sheet nav::-webkit-scrollbar-thumb:hover { background: color-mix(in srgb, var(--snap-muted) 60%, transparent); }
.snap-toc a, .snap-toc-sheet a { display: block; width: 100%; min-width: 0; padding: 6px 0 6px 11px; border-left: 1px solid var(--snap-line); color: var(--snap-muted); font-size: .78rem; line-height: 1.42; text-decoration: none; white-space: normal; overflow-wrap: anywhere; word-break: break-word; }
.snap-toc a[data-level="3"], .snap-toc-sheet a[data-level="3"] { padding-left: 23px; font-size: .74rem; }
.snap-toc a:hover, .snap-toc a.is-current, .snap-toc-sheet a:hover, .snap-toc-sheet a.is-current { border-left-color: var(--snap-accent); color: var(--snap-text); background: linear-gradient(90deg, var(--snap-accent-soft), transparent 75%); }

.snap-article { min-width: 0; width: 100%; }
.snap-article-head { margin-bottom: 30px; }
.snap-article-head h1 { max-width: 20em; margin: 0; font-family: Georgia, "Noto Serif CJK TC", "Songti TC", serif; font-size: clamp(2rem, 4.2vw, 3.25rem); line-height: 1.14; letter-spacing: -.028em; text-wrap: balance; overflow-wrap: anywhere; word-break: normal; }
.snap-article-meta { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 20px; color: var(--snap-muted); font-size: .78rem; }
.snap-article-meta span { display: inline-flex; align-items: center; gap: 6px; }
.snap-article-meta span::before { content: ''; width: 3px; height: 3px; border-radius: 50%; background: var(--snap-faint); }

.snap-disclaimer { display: grid; grid-template-columns: 24px minmax(0, 1fr); gap: 12px; margin: 0 0 42px; padding: 16px 18px; border: 1px solid var(--snap-line); border-left: 2px solid var(--snap-accent); border-radius: 6px; background: var(--snap-surface); color: var(--snap-muted); }
.snap-disclaimer-mark { width: 20px; height: 20px; display: grid; place-items: center; border: 1px solid var(--snap-line-strong); border-radius: 50%; color: var(--snap-text); font: 700 .7rem/1 Georgia, serif; user-select: none; }
.snap-disclaimer p { min-width: 0; margin: 0; font-size: .82rem; overflow-wrap: anywhere; }
.snap-disclaimer strong { color: var(--snap-text); }

.snap-markdown { min-width: 0; font-family: Georgia, "Noto Serif CJK TC", "Songti TC", serif; font-size: clamp(1rem, .97rem + .15vw, 1.075rem); line-height: 1.88; overflow-wrap: anywhere; word-break: normal; }
.snap-markdown > :first-child { margin-top: 0; }
.snap-markdown > :last-child { margin-bottom: 0; }
.snap-markdown p { margin: 1.15em 0; }
.snap-markdown h1, .snap-markdown h2, .snap-markdown h3, .snap-markdown h4, .snap-markdown h5, .snap-markdown h6 { color: var(--snap-text); overflow-wrap: anywhere; word-break: normal; text-wrap: pretty; }
.snap-markdown h1 { margin: 2.25em 0 .7em; font-size: clamp(1.7rem, 4vw, 2.3rem); line-height: 1.2; }
.snap-markdown h2 { margin: 2.35em 0 .75em; padding-top: .35em; border-top: 1px solid var(--snap-line); font-size: clamp(1.4rem, 3vw, 1.82rem); line-height: 1.28; }
.snap-markdown h3 { margin: 1.9em 0 .65em; font-size: clamp(1.15rem, 2.3vw, 1.4rem); line-height: 1.35; }
.snap-markdown h4 { margin: 1.6em 0 .5em; font-size: 1.05rem; }
.snap-markdown ul, .snap-markdown ol { max-width: 100%; margin: 1em 0; padding-left: min(1.6em, 7vw); }
.snap-markdown li { min-width: 0; margin: .35em 0; }
.snap-markdown blockquote { margin: 1.5em 0; padding: .2em 0 .2em 1.25em; border-left: 2px solid var(--snap-line-strong); color: var(--snap-muted); }
.snap-markdown blockquote > :first-child { margin-top: 0; }
.snap-markdown blockquote > :last-child { margin-bottom: 0; }
.snap-markdown code { max-width: 100%; padding: .12em .35em; border: 1px solid var(--snap-line); border-radius: 4px; background: var(--snap-surface-soft); font: .88em/1.5 "SFMono-Regular", Consolas, monospace; overflow-wrap: anywhere; }
.snap-markdown pre { max-width: 100%; margin: 1.5em 0; padding: 18px; overflow-x: auto; border: 1px solid var(--snap-line); border-radius: 7px; background: var(--snap-code); color: var(--snap-code-text); tab-size: 4; scrollbar-width: thin; }
.snap-markdown pre code { display: block; min-width: max-content; padding: 0; border: 0; background: transparent; color: inherit; overflow-wrap: normal; white-space: pre; }
.snap-markdown table { display: block; width: 100%; max-width: 100%; margin: 1.5em 0; border-collapse: collapse; overflow-x: auto; scrollbar-width: thin; font-family: Inter, ui-sans-serif, sans-serif; font-size: .86rem; }
.snap-markdown th, .snap-markdown td { min-width: 8rem; padding: 10px 12px; border: 1px solid var(--snap-line); text-align: left; vertical-align: top; }
.snap-markdown th { background: var(--snap-surface-soft); font-weight: 700; }
.snap-markdown img, .snap-markdown video, .snap-markdown svg { display: block; width: auto; height: auto; max-width: 100%; margin: 1.6em auto; border-radius: 5px; }
.snap-markdown iframe, .snap-markdown embed { display: block; width: 100%; max-width: 100%; min-height: min(28rem, 60vw); margin: 1.6em 0; border: 1px solid var(--snap-line); border-radius: 5px; }
.snap-markdown hr { height: 1px; margin: 2.5em 0; border: 0; background: var(--snap-line); }
.snap-markdown mark { padding: .05em .18em; background: #f3e49b; color: #202020; }
.snap-markdown details { max-width: 100%; margin: 1.35em 0; border-block: 1px solid var(--snap-line); padding: 12px 0; }
.snap-markdown summary { color: var(--snap-text); font-family: Inter, ui-sans-serif, sans-serif; font-weight: 700; cursor: pointer; }
.snap-markdown a { overflow-wrap: anywhere; word-break: break-word; }
.snap-markdown a[href^="http"]::after { content: ' ↗'; font-size: .7em; text-decoration: none; }
.snap-markdown .warning-box, .snap-markdown .status-box, .snap-markdown .article-card { max-width: 100%; margin: 1.35em 0; padding: 16px 18px; border: 1px solid var(--snap-line); border-radius: 6px; background: var(--snap-surface); font-family: Inter, ui-sans-serif, sans-serif; }
.snap-markdown .warning-box { border-left: 3px solid #b28a35; }
.snap-markdown .status-box { border-left: 3px solid var(--snap-accent); }
.snap-markdown .spoiler { border-radius: 3px; background: var(--snap-text); color: transparent; cursor: pointer; transition: color var(--snap-fast); }
.snap-markdown .spoiler:hover, .snap-markdown .spoiler:focus { color: var(--snap-bg); }
.snap-markdown .rainbow-text { color: var(--snap-accent); background: linear-gradient(90deg, #826a98, #356f8e, #54826a); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.snap-markdown .drop-cap::first-letter { float: left; margin: .08em .12em 0 0; font-size: 3.1em; line-height: .82; }
.snap-markdown .magic-link { font-weight: 700; text-decoration-style: dotted; }
.snap-phiz { position: relative; width: min(100%, 18rem); margin: 1.6em auto; text-align: center; }
.snap-phiz img { max-height: 16rem; object-fit: contain; }
.snap-phiz figcaption { margin-top: 6px; color: var(--snap-muted); font-family: Inter, ui-sans-serif, sans-serif; font-size: .72rem; }
.snap-chat { max-width: 100%; margin: 2em 0; padding: 18px; border: 1px solid var(--snap-line); border-radius: 8px; background: var(--snap-surface); font-family: Inter, ui-sans-serif, sans-serif; }
.snap-chat > h2 { margin: 0 0 18px; padding: 0 0 10px; font-size: 1rem; }
.snap-chat-message { min-width: 0; display: grid; grid-template-columns: 28px minmax(0, 1fr); gap: 10px; margin: 12px 0; }
.snap-chat-message.is-me { grid-template-columns: minmax(0, 1fr) 28px; }
.snap-chat-message.is-me .snap-chat-avatar { grid-column: 2; }
.snap-chat-message.is-me > div { grid-column: 1; grid-row: 1; text-align: right; }
.snap-chat-avatar { width: 28px; height: 28px; display: grid; place-items: center; border: 1px solid var(--snap-line); border-radius: 50%; color: var(--snap-muted); font: 700 .72rem Georgia, serif; }
.snap-chat-message strong { display: block; margin-bottom: 3px; font-size: .7rem; color: var(--snap-muted); }
.snap-chat-message > div > div { display: inline-block; max-width: min(100%, 34rem); padding: 9px 12px; border-radius: 7px; background: var(--snap-surface-soft); text-align: left; overflow-wrap: anywhere; }

.snap-publication { position: relative; max-width: 100%; margin-top: clamp(50px, 9vw, 80px); padding: 24px 28px; overflow: hidden; border-radius: 4px; background: #101827; color: #e7edf5; box-shadow: var(--snap-shadow); font-family: Inter, ui-sans-serif, sans-serif; }
[data-theme="light"] .snap-publication { background: #111a29; }
[data-theme="dark"] .snap-publication { background: #111722; border: 1px solid #263140; }
.snap-publication h2 { position: relative; z-index: 1; margin: 0 0 7px; font-size: .92rem; line-height: 1.45; overflow-wrap: anywhere; }
.snap-document-url { position: relative; z-index: 1; display: inline-block; max-width: 100%; margin-bottom: 20px; color: #92bde0; font-size: .78rem; word-break: break-all; }
.snap-document-url:visited { color: #92bde0; }
.snap-document-url:hover { color: #d9edff; }
.snap-watermark { position: absolute; right: 12px; top: 50%; transform: translateY(-50%); color: #dce8f4; font-size: clamp(3.5rem, 11vw, 5.4rem); line-height: 1; font-weight: 850; letter-spacing: -.06em; opacity: .055; pointer-events: none; user-select: none; }
.snap-metadata-grid { position: relative; z-index: 1; display: flex; flex-wrap: wrap; gap: 15px 28px; margin: 0; }
.snap-metadata-grid div { min-width: min(100%, 8rem); }
.snap-metadata-grid dt { color: #8899ad; font-size: .68rem; letter-spacing: .05em; }
.snap-metadata-grid dd { margin: 2px 0 0; color: #f1f5f9; font-size: .78rem; font-weight: 600; overflow-wrap: anywhere; }

.snap-history { margin-top: 28px; padding: 22px 0 0; border-top: 1px solid var(--snap-line); font-family: Inter, ui-sans-serif, sans-serif; }
.snap-history header { display: flex; align-items: end; justify-content: space-between; gap: 14px; margin-bottom: 16px; }
.snap-history header p { margin: 0 0 2px; color: var(--snap-faint); font-size: .64rem; font-weight: 750; letter-spacing: .14em; text-transform: uppercase; }
.snap-history h2 { margin: 0; font-size: 1rem; line-height: 1.3; }
.snap-history header > span { color: var(--snap-muted); font-size: .7rem; }
.snap-history ol { margin: 0; padding: 0; list-style: none; }
.snap-history li { position: relative; display: grid; grid-template-columns: 12px minmax(0, 1fr) auto; align-items: center; gap: 11px; min-height: 42px; padding: 5px 0; }
.snap-history li:not(:last-child)::after { content: ''; position: absolute; left: 5.5px; top: 27px; bottom: -10px; width: 1px; background: var(--snap-line); }
.snap-history-dot { width: 12px; height: 12px; border: 3px solid var(--snap-line-strong); border-radius: 50%; background: var(--snap-bg); z-index: 1; }
.snap-history li:first-child .snap-history-dot { border-color: var(--snap-accent); box-shadow: 0 0 0 4px var(--snap-accent-soft); }
.snap-history strong { display: block; font-size: .78rem; }
.snap-history time, .snap-history-current { color: var(--snap-muted); font-size: .7rem; }

.snap-toc-button { position: fixed; right: max(16px, env(safe-area-inset-right)); bottom: max(18px, env(safe-area-inset-bottom)); z-index: 45; min-height: 44px; padding: 0 16px; border: 1px solid var(--snap-line-strong); border-radius: 999px; background: var(--snap-text); color: var(--snap-bg); box-shadow: var(--snap-shadow); font-weight: 750; font-size: .76rem; }
.snap-toc-drawer { position: fixed; inset: 0; z-index: 80; }
.snap-toc-backdrop { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; background: rgba(5, 8, 12, .5); }
.snap-toc-sheet { position: absolute; inset: auto 0 0; max-height: min(72vh, 34rem); padding: 18px 20px max(24px, env(safe-area-inset-bottom)); border-radius: 14px 14px 0 0; background: var(--snap-surface); box-shadow: 0 -18px 60px rgba(0, 0, 0, .24); animation: snap-sheet-in var(--snap-motion) both; }
.snap-toc-sheet header { display: flex; justify-content: space-between; align-items: center; gap: 18px; margin-bottom: 12px; }
.snap-toc-sheet h2 { margin: 0; font-size: 1rem; }
.snap-toc-sheet header button { width: 40px; height: 40px; border: 1px solid var(--snap-line); border-radius: 50%; background: transparent; color: var(--snap-text); font-size: 1.25rem; }
.snap-toc-sheet nav { max-height: calc(min(72vh, 34rem) - 88px); min-width: 0; overflow-y: auto; padding-right: 8px; scrollbar-width: thin; scrollbar-color: color-mix(in srgb, var(--snap-muted) 35%, transparent) transparent; }

.snap-footer { min-height: 58px; padding: 14px max(20px, env(safe-area-inset-right)) max(14px, env(safe-area-inset-bottom)) max(20px, env(safe-area-inset-left)); display: flex; justify-content: space-between; align-items: center; gap: 18px; border-top: 1px solid var(--snap-line); color: var(--snap-faint); font-size: .7rem; letter-spacing: .06em; }

/* Upload */
.snap-upload-shell { width: min(100% - 36px, 48rem); min-height: calc(100vh - 116px); margin: 0 auto; padding: clamp(54px, 9vw, 92px) 0 80px; }
.snap-upload-intro { max-width: 37rem; margin-bottom: 34px; }
.snap-upload-intro h1 { margin: 0; font-family: Georgia, "Times New Roman", serif; font-size: clamp(2.3rem, 7vw, 4.5rem); line-height: 1.05; letter-spacing: -.04em; }
.snap-upload-intro > p:last-child { max-width: 35rem; margin: 17px 0 0; color: var(--snap-muted); }
.snap-form-panel { margin-top: 18px; padding: clamp(20px, 5vw, 34px); border: 1px solid var(--snap-line); border-radius: var(--snap-radius); background: var(--snap-surface); box-shadow: var(--snap-shadow); }
.snap-step { display: grid; grid-template-columns: 32px minmax(0, 1fr); gap: 14px; padding-bottom: 20px; border-bottom: 1px solid var(--snap-line); }
.snap-step > span { padding-top: 3px; color: var(--snap-faint); font-size: .66rem; font-weight: 750; letter-spacing: .12em; }
.snap-step h2 { margin: 0; font-size: 1.05rem; }
.snap-step p { margin: 3px 0 0; color: var(--snap-muted); font-size: .8rem; }
.snap-form { margin-top: 22px; }
.snap-form label, .snap-success > label { display: block; color: var(--snap-muted); font-size: .72rem; font-weight: 700; letter-spacing: .05em; }
.snap-form input, .snap-form select, .snap-success input { width: 100%; min-width: 0; min-height: 46px; margin-top: 7px; padding: 0 13px; border: 1px solid var(--snap-line-strong); border-radius: 7px; background: var(--snap-bg); color: var(--snap-text); }
.snap-inline-field { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px; align-items: end; }
.snap-inline-field button, .snap-secondary-button { min-height: 46px; padding: 0 16px; border: 1px solid var(--snap-line-strong); border-radius: 7px; background: var(--snap-surface-soft); color: var(--snap-text); font-size: .78rem; font-weight: 750; }
.snap-inline-field button:hover, .snap-secondary-button:hover { border-color: var(--snap-accent); background: var(--snap-accent-soft); }
.snap-form-message { min-height: 1.5em; margin: 14px 0 0; color: var(--snap-muted); font-size: .78rem; }
.snap-form-message.is-error { color: #a63e3e; }
[data-theme="dark"] .snap-form-message.is-error { color: #f09a9a; }
.snap-file-field { position: relative; min-height: 110px; display: flex !important; flex-direction: column; justify-content: center; align-items: center; padding: 18px; border: 1px dashed var(--snap-line-strong); border-radius: 8px; background: var(--snap-bg); text-align: center; cursor: pointer; }
.snap-file-field:hover { border-color: var(--snap-accent); background: var(--snap-accent-soft); }
.snap-file-field input { position: absolute; width: 1px; height: 1px; opacity: 0; pointer-events: none; }
.snap-file-title { color: var(--snap-text); font-size: .9rem; font-weight: 750; }
.snap-file-name { max-width: 100%; margin-top: 5px; color: var(--snap-muted); font-size: .74rem; overflow-wrap: anywhere; }
.snap-form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin-top: 18px; }
.snap-form-grid small { display: block; margin-top: 5px; color: var(--snap-faint); font-size: .66rem; font-weight: 400; letter-spacing: 0; }
.snap-upload-notes { margin: 20px 0; padding: 14px 16px; border-left: 2px solid var(--snap-line-strong); background: var(--snap-bg); color: var(--snap-muted); font-size: .75rem; }
.snap-upload-notes p { margin: 0; }
.snap-upload-notes p + p { margin-top: 7px; }
.snap-upload-notes code { color: var(--snap-text); }
.snap-submit { width: 100%; border-color: var(--snap-text); }
.snap-success-mark { margin: 0 0 6px; color: var(--snap-accent); font-size: .68rem; font-weight: 800; letter-spacing: .13em; text-transform: uppercase; }
.snap-success h2 { margin: 0; font-family: Georgia, "Times New Roman", serif; font-size: clamp(1.4rem, 4vw, 2rem); line-height: 1.25; overflow-wrap: anywhere; }
.snap-result-meta { display: flex; flex-wrap: wrap; gap: 18px 32px; margin: 20px 0; }
.snap-result-meta dt { color: var(--snap-faint); font-size: .68rem; }
.snap-result-meta dd { margin: 2px 0 0; font-size: .82rem; font-weight: 700; }
.snap-result-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.snap-secondary-button { background: transparent; }

@keyframes snap-spin { to { transform: rotate(360deg); } }
@keyframes snap-sheet-in { from { transform: translateY(24px); opacity: 0; } to { transform: none; opacity: 1; } }

@media (max-width: 979px) {
    .snap-document { grid-template-columns: minmax(0, var(--snap-reading)); }
    .snap-toc { display: none; }
}

@media (min-width: 980px) {
    .snap-toc-button { display: none !important; }
}

@media (max-width: 600px) {
    .snap-header { min-height: 54px; padding-inline: max(12px, env(safe-area-inset-left)); }
    .snap-return { padding-inline: 11px; font-size: .7rem; }
    .snap-control { min-width: 40px; min-height: 40px; }
    .snap-document { width: min(100% - 28px, 45rem); padding-top: 42px; padding-bottom: 58px; }
    .snap-article-head h1 { font-size: clamp(1.85rem, 9vw, 2.5rem); line-height: 1.16; }
    .snap-disclaimer { margin-bottom: 32px; padding: 14px; }
    .snap-markdown { line-height: 1.82; }
    .snap-markdown pre { padding: 14px; margin-inline: 0; }
    .snap-publication { padding: 21px 19px; }
    .snap-metadata-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 13px; }
    .snap-history li { grid-template-columns: 12px minmax(0, 1fr); }
    .snap-history-current { display: none; }
    .snap-upload-shell { width: min(100% - 28px, 48rem); padding-top: 44px; }
    .snap-upload-intro h1 { font-size: clamp(2.2rem, 14vw, 3.2rem); }
    .snap-form-panel { padding: 20px 16px; }
    .snap-form-grid { grid-template-columns: 1fr; }
    .snap-inline-field { grid-template-columns: 1fr; }
    .snap-inline-field button { width: 100%; }
    .snap-result-actions { flex-direction: column; }
    .snap-result-actions > * { width: 100%; }
}

@media (max-width: 350px) {
    .snap-return { max-width: 88px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
    .snap-controls { gap: 5px; }
    .snap-metadata-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}