.page-shorts { height: 100dvh; overflow: hidden; background: #f7f7fa; }
.page-shorts::before { opacity: .45; }
.page-shorts::after { display: none; }
.shorts-top { flex: none; height: 64px; position: relative; z-index: 3; border-bottom: 1px solid var(--border); background: #fafafa; }
.shorts-top-inner { max-width: 1100px; height: 100%; padding: 0 24px; margin: auto; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.shorts-back { display: inline-flex; align-items: center; gap: 7px; color: var(--muted); font-size: 12px; }
.shorts-back .mi { width: 17px; height: 17px; }
.shorts-brand { display: flex; align-items: center; gap: 9px; font-size: 19px; font-weight: 650; letter-spacing: -.025em; }
.shorts-logo { width: 27px; height: 32px; display: grid; place-items: center; border-radius: 9px; transform: rotate(-8deg); background: var(--accent); color: white; }
.shorts-logo .mi { width: 18px; height: 18px; transform: rotate(8deg); }
.shorts-exam { margin-left: 2px; padding: 4px 8px; border: 1px solid var(--border); border-radius: 7px; color: var(--muted); font-size: 11px; font-weight: 500; letter-spacing: 0; }
.shorts-icon { width: 40px; height: 40px; display: grid; place-items: center; flex: none; border-radius: 50%; color: var(--muted); }
.shorts-icon:hover { background: var(--accent-50); color: var(--accent-700); }
.shorts-icon .mi { width: 21px; height: 21px; }
.shorts-workspace { width: 100%; min-width: 0; flex: none; max-height: 860px; position: relative; height: calc(100dvh - 64px); max-width: 980px; padding: 20px 24px 14px; margin: auto; display: grid; grid-template-columns: minmax(0,540px) minmax(250px,300px); justify-content: center; gap: 28px; }
.shorts-stage { display: flex; flex-direction: column; min-height: 0; min-width: 0; }
.shorts-session { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 12px; font-size: 11.5px; color: var(--muted); }
.shorts-session > span:first-child { overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.shorts-session > span:last-child { flex: none; }
.shorts-session b { color: var(--ink); font-weight: 600; }
.shorts-feed { width: 100%; min-width: 0; flex: 1; min-height: 0; overflow-y: auto; scroll-snap-type: y mandatory; scrollbar-width: none; overscroll-behavior-y: contain; border: 1px solid var(--border); border-radius: 24px; background: var(--surface); box-shadow: var(--shadow-sm); }
.shorts-feed::-webkit-scrollbar { display: none; }
.short-card { width: 100%; min-width: 0; display: flex; flex-direction: column; height: 100%; min-height: 100%; padding: 22px; gap: 14px; scroll-snap-align: start; scroll-snap-stop: always; overflow: hidden; position: relative; }
.short-card-meta { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex: none; }
.short-subject { display: inline-flex; align-items: center; gap: 6px; padding: 5px 9px; border-radius: 8px; color: var(--accent-700); background: var(--accent-50); font-size: 10.5px; font-weight: 600; }
.short-subject.tone-blue { background: var(--blue-soft); color: #176caa; }
.short-subject.tone-orange { background: var(--orange-soft); color: #aa5a10; }
.short-subject.tone-green { background: var(--green-soft); color: #148947; }
.short-task-link { display: flex; align-items: center; gap: 5px; font-size: 10.5px; color: var(--muted); }
.short-task-link .mi { width: 15px; height: 15px; }
.short-card-content { min-width: 0; overflow-wrap: anywhere; min-height: 110px; flex: 1; overflow-y: auto; scrollbar-width: thin; scrollbar-color: var(--border-strong) transparent; padding-right: 3px; }
.short-card-content h2 { font: 400 28px/1.12 "Instrument Serif",Georgia,serif; letter-spacing: -.02em; margin-bottom: 14px; }
.short-card-content .statement, .short-card-content .short-material, .short-card-content .short-context { font-size: 16px; line-height: 1.58; color: var(--ink-2); }
.short-card-content .statement p + p { margin-top: 10px; }
.short-card-content .figure, .short-card-content .statement-figure { margin: 12px auto; text-align: center; }
.short-card-content img, .short-card-content .figure svg { max-width: 100%; max-height: 185px; object-fit: contain; height: auto; }
.short-card-content .figure svg { width: auto; }
.short-card-content .short-material { padding-bottom: 14px; margin-bottom: 14px; border-bottom: 1px solid var(--border); }
.short-card-content table { max-width: 100%; border-collapse: collapse; font-size: 12px; }
.short-card-content td, .short-card-content th { border: 1px solid var(--border); padding: 5px 8px; }
.short-card-content .datatable { overflow-x: auto; margin: 12px 0; }
.short-card-content .katex { font-size: 1.04em; }
.short-guidance { margin: 12px 0 0; font-size: 12px; color: var(--muted); line-height: 1.5; }
.short-context { list-style: none; margin: 12px 0; }
.short-context li + li { margin-top: 8px; }
.short-matching { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 12px 0; font-size: 13px; }
.short-matching ul { list-style: none; }
.short-options { display: grid; grid-template-columns: 1fr; gap: 8px; flex: none; }
.short-options.is-short { grid-template-columns: repeat(2,minmax(0,1fr)); }
.short-option { min-width: 0; min-height: 52px; padding: 12px; display: flex; align-items: center; gap: 10px; border: 1px solid var(--border-strong); border-radius: 12px; background: var(--surface); color: var(--ink); text-align: left; font-size: 14px; line-height: 1.35; overflow-wrap: anywhere; transition: border-color .15s, background .15s; }
.short-option .letter { display: grid; place-items: center; width: 23px; height: 23px; flex: none; border-radius: 7px; background: var(--surface-2); color: var(--muted); font-size: 10px; font-weight: 600; }
.short-option:hover:not(:disabled) { background: var(--accent-50); border-color: var(--accent-200); }
.short-option:disabled { cursor: default; opacity: 1; }
.short-option.is-selected { border-color: var(--accent); background: var(--accent-50); }
.short-option.is-right { border-color: #71c99a; background: #effaf3; color: #167847; }
.short-option.is-right .letter { background: #d8f1e3; color: #167847; }
.short-option.is-wrong { border-color: #eea1a9; background: #fff2f3; color: #b5404c; }
.short-option.is-wrong .letter { background: #ffe0e4; color: #b5404c; }
.short-option .mi { width: 17px; height: 17px; margin-left: auto; flex: none; }
.short-feedback { border-radius: 12px; padding: 10px 12px; background: var(--surface-2); font-size: 12px; line-height: 1.45; flex: none; }
.short-feedback[hidden] { display: none; }
.short-feedback strong { font-size: 13px; display: block; margin-bottom: 3px; }
.short-feedback.is-right strong { color: #16834a; }
.short-feedback.is-wrong strong { color: #b5404c; }
.short-feedback a { color: var(--accent-700); text-decoration: underline; text-underline-offset: 2px; }
.short-card-footer { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex: none; }
.short-skip { min-height: 38px; color: var(--muted); font-size: 11px; padding: 8px 0; }
.short-next { min-height: 38px; padding: 8px 14px; border-radius: 999px; display: inline-flex; align-items: center; justify-content: center; gap: 7px; background: var(--ink); color: white; font-size: 12px; font-weight: 500; }
.short-next .mi { width: 15px; height: 15px; }
.shorts-stage-foot { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 10px 2px 0; color: var(--muted-2); font-size: 10px; }
.shorts-stage-foot > span:first-child { display: flex; align-items: center; gap: 6px; }
.shorts-stage-foot .mi { width: 14px; height: 14px; }
.shorts-touch-hint { display: none; }
.shorts-side { overflow-y: auto; scrollbar-width: thin; min-height: 0; padding-bottom: 4px; }
.shorts-settings { background: white; border: 1px solid var(--border); border-radius: 20px; padding: 19px; }
.shorts-panel-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 16px; }
.shorts-eyebrow { display: block; font-size: 9px; letter-spacing: .09em; text-transform: uppercase; color: var(--muted); font-weight: 600; }
.shorts-panel-head h2 { font-size: 18px; margin-top: 3px; letter-spacing: -.03em; }
.settings-close { display: none; }
.shorts-mode { border: 0; display: flex; flex-direction: column; gap: 5px; margin-bottom: 14px; }
.shorts-mode label { position: relative; display: block; }
.shorts-mode input { position: absolute; opacity: 0; }
.shorts-mode span { display: block; padding: 10px 12px; border: 1px solid var(--border); border-radius: 10px; font-size: 12px; color: var(--muted); }
.shorts-mode input:checked + span { border-color: var(--accent-200); background: var(--accent-50); color: var(--accent-700); font-weight: 600; }
.shorts-mode input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 2px; }
.shorts-selection > p, .shorts-all-note { margin: 0 0 12px; color: var(--muted); font-size: 11px; line-height: 1.5; }
.shorts-subjects { display: flex; flex-direction: column; gap: 6px; max-height: 280px; overflow-y: auto; scrollbar-width: thin; }
.shorts-subject { display: flex; align-items: center; gap: 9px; padding: 8px 9px; border: 1px solid var(--border); border-radius: 10px; cursor: pointer; font-size: 11.5px; position: relative; }
.shorts-subject input { accent-color: var(--accent); width: 14px; height: 14px; }
.shorts-subject .mi { display: none; }
.shorts-subject:has(input:checked) { border-color: var(--accent-100); background: #fbfaff; }
.shorts-subject-icon { width: 26px; height: 26px; flex: none; border-radius: 7px; background: var(--accent-50); color: var(--accent-700); display: grid; place-items: center; font: 15px "Instrument Serif",serif; }
.shorts-subject-icon.tone-blue { background: var(--blue-soft); color: #2678b5; }
.shorts-subject-icon.tone-orange { background: var(--orange-soft); color: #bd7028; }
.shorts-single { display: flex; flex-direction: column; gap: 7px; font-size: 12px; color: var(--muted); }
.shorts-single select { width: 100%; min-height: 44px; padding: 8px 10px; border: 1px solid var(--border); background: white; border-radius: 10px; font: inherit; color: var(--ink); }
.shorts-single[hidden], .shorts-selection[hidden], .shorts-all-note[hidden] { display: none; }
.shorts-apply { width: 100%; min-height: 42px; display: flex; align-items: center; justify-content: center; gap: 8px; margin-top: 16px; padding: 10px; border-radius: 999px; background: var(--accent); color: white; font-size: 12px; font-weight: 500; }
.shorts-apply .mi { width: 16px; height: 16px; }
.shorts-save-note { font-size: 10px; color: var(--muted-2); margin: 10px 0 0; text-align: center; }
.shorts-settings-status { font-size: 11px; color: var(--red); margin-top: 8px; }
.shorts-settings-status:empty { display: none; }
.shorts-about { padding: 24px 12px; color: var(--muted); font-size: 12px; line-height: 1.6; }
.shorts-about h3 { font: 28px "Instrument Serif",serif; color: var(--ink); margin: 8px 0; }
.shorts-about > div { display: flex; align-items: center; gap: 7px; font-size: 11px; margin-top: 10px; }
.shorts-about .mi { width: 15px; height: 15px; color: var(--accent); }
.shorts-placeholder { height: 100%; display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 28px; text-align: center; gap: 16px; }
.shorts-placeholder h1 { font: 34px/1.12 "Instrument Serif",serif; }
.shorts-placeholder p { max-width: 270px; font-size: 13px; color: var(--muted); line-height: 1.6; }
.shorts-placeholder button { border-radius: 999px; padding: 10px 16px; background: var(--accent); color: white; font-size: 13px; }
.shorts-spinner { width: 23px; height: 23px; border: 2px solid var(--accent-100); border-top-color: var(--accent); border-radius: 50%; animation: shorts-spin .75s linear infinite; }
@keyframes shorts-spin { to { transform: rotate(360deg); } }
.shorts-settings-dialog { padding: 0; border: 0; border-radius: 24px; margin: auto; width: min(420px,calc(100vw - 24px)); max-height: calc(100dvh - 24px); background: white; color: var(--ink); }
.shorts-settings-dialog::backdrop { background: rgba(22,18,35,.35); backdrop-filter: blur(3px); }
.shorts-settings-dialog .shorts-settings { border: 0; padding: 22px; }
.shorts-settings-dialog .settings-close { display: grid; }
.shorts-settings-dialog .shorts-subjects { max-height: 240px; }
.shorts-noscript { font-size: 12px; padding: 12px; }
.shorts-noscript a { text-decoration: underline; }
.short-option:focus-visible, .short-next:focus-visible, .shorts-icon:focus-visible, .shorts-apply:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
@media (max-width: 900px) {
  .shorts-top { height: 54px; }
  .shorts-top-inner { padding: 0 14px; gap: 12px; }
  .shorts-back span { display: none; }
  .shorts-back { width: 40px; height: 40px; justify-content: center; }
  .shorts-brand { font-size: 18px; }
  .shorts-workspace { max-height: none; height: calc(100dvh - 54px); display: flex; justify-content: center; padding: 12px 12px max(8px,env(safe-area-inset-bottom)); }
  .shorts-stage { width: 100%; max-width: 540px; }
  .shorts-side { display: none; }
  .shorts-session { margin-bottom: 9px; font-size: 11px; }
  .shorts-feed { border-radius: 20px; }
  .short-card { padding: 18px; gap: 12px; }
  .short-card-content h2 { font-size: 26px; }
  .shorts-stage-foot { font-size: 10px; padding-top: 8px; }
  .shorts-touch-hint { display: inline; }
  .shorts-desktop-hint { display: none; }
  .short-feedback { font-size: 11.5px; }
}
@media (max-height: 700px) and (max-width: 900px) {
  .short-card { padding: 14px; gap: 8px; }
  .short-option { min-height: 46px; padding: 9px; font-size: 13px; }
  .short-card-content h2 { font-size: 23px; margin-bottom: 9px; }
  .short-card-content .statement { font-size: 15px; }
  .short-feedback { padding: 8px 10px; }
  .shorts-stage-foot { display: none; }
  .short-card-content img { max-height: 130px; }
}
@media (prefers-reduced-motion: reduce) { .shorts-spinner { animation: none; } .short-option { transition: none; } }

.short-card-hint, .short-review-options { font-size: 11px; color: var(--muted); min-height: 38px; display: flex; align-items: center; }
.short-review-options[hidden], .short-card-hint[hidden] { display: none; }
.short-options.is-answered:not(.show-all) .short-option:not(.is-right):not(.is-wrong) { display: none; }
@media (max-height: 700px) and (max-width: 900px) { .short-card-content { min-height: 90px; } .short-options:not(.is-short) { max-height: 225px; overflow-y: auto; } }

.shorts-mode .sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
.short-option .mi, .short-next .mi, .short-task-link .mi { fill: none; }
.short-card-meta { min-width: 0; }
.short-subject { min-width: 0; max-width: calc(100% - 65px); }
@media (max-height: 600px) and (max-width: 900px) { .short-card { gap: 6px; padding: 12px; } .short-card-content { min-height: 75px; } .short-feedback { max-height: 86px; overflow-y: auto; } .short-options:not(.is-short) { max-height: 190px; } }

.short-condition-wrap { position: relative; min-width: 0; min-height: 110px; flex: 1; }
.short-condition-wrap .short-card-content { height: 100%; min-height: 0; padding-bottom: 25px; }
.short-scroll-hint { position: absolute; left: 0; right: 0; bottom: 0; height: 32px; padding-top: 13px; text-align: center; background: linear-gradient(transparent,white 42%); color: var(--muted); font-size: 10px; pointer-events: none; }
.short-scroll-hint[hidden] { display: none; }
@media (max-height: 700px) and (max-width: 900px) { .short-condition-wrap { min-height: 90px; } }
@media (max-height: 600px) and (max-width: 900px) { .short-condition-wrap { min-height: 75px; } }