@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;600;700&family=Noto+Sans+JP:wght@400;600;700;900&display=swap');

:root {
  --paper: #f4efe4;
  --paper-2: #ebe3d3;
  --white: #fffdf7;
  --ink: #172d29;
  --muted: #68736e;
  --green: #176b50;
  --coral: #ef684f;
  --yellow: #f2c84b;
  --blue: #5b91a8;
  --line: rgba(23, 45, 41, .2);
  --shadow: 0 18px 50px rgba(32, 48, 43, .13);
  font-family: 'Noto Sans JP', sans-serif;
  color: var(--ink);
  background: var(--paper);
}

* { box-sizing: border-box; }
html, body { min-height: 100%; margin: 0; }
body { min-width: 320px; background: var(--paper); overflow-x: hidden; }
button, input { font: inherit; }
button { color: inherit; }

.paper-noise { position: fixed; inset: 0; z-index: -1; opacity: .36; pointer-events: none; background-image: radial-gradient(rgba(23,45,41,.22) .55px, transparent .65px), radial-gradient(rgba(255,255,255,.8) .7px, transparent .8px); background-position: 0 0, 4px 5px; background-size: 9px 9px, 11px 11px; }
.app-shell { min-height: 100vh; display: grid; grid-template-rows: auto 1fr auto; }

.topbar { min-height: 84px; display: grid; grid-template-columns: minmax(180px, 1fr) minmax(280px, 1.5fr) minmax(180px, 1fr); align-items: center; gap: 24px; padding: 13px clamp(18px, 3.2vw, 52px); border-bottom: 1px solid var(--line); background: rgba(244,239,228,.94); backdrop-filter: blur(12px); }
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark { position: relative; width: 43px; height: 43px; flex: none; }
.brand-mark i { position: absolute; display: block; box-shadow: 2px 2px 0 rgba(23,45,41,.12); }
.brand-mark i:nth-child(1) { width: 27px; height: 25px; left: 0; top: 8px; background: var(--green); clip-path: polygon(8% 12%, 92% 0, 100% 77%, 20% 100%); transform: rotate(-8deg); }
.brand-mark i:nth-child(2) { width: 24px; height: 27px; right: 0; bottom: 0; background: var(--coral); clip-path: polygon(22% 0, 100% 17%, 80% 100%, 0 78%); transform: rotate(6deg); }
.brand-mark i:nth-child(3) { width: 15px; height: 15px; left: 15px; top: 0; border-radius: 50%; background: var(--yellow); }
.brand strong, .brand span { display: block; font-family: 'DM Sans', sans-serif; line-height: 1; }
.brand strong { font-size: 14px; letter-spacing: .14em; }
.brand span { margin-top: 5px; color: var(--coral); font-size: 9px; font-weight: 700; letter-spacing: .24em; }
.studio-heading { text-align: center; min-width: 0; }
.eyebrow { color: var(--coral); font-family: 'DM Sans', sans-serif; font-size: 9px; font-weight: 700; letter-spacing: .19em; }
.studio-heading h1 { margin: 4px 0 0; overflow: hidden; font-size: clamp(14px, 1.65vw, 20px); letter-spacing: .04em; text-overflow: ellipsis; white-space: nowrap; }
.header-actions { display: flex; justify-content: flex-end; align-items: center; gap: 8px; }
.header-button, .icon-button { min-height: 42px; border: 1px solid var(--line); background: rgba(255,255,255,.45); cursor: pointer; transition: transform .16s, background .16s, border-color .16s; }
.header-button { display: flex; align-items: center; gap: 8px; padding: 0 16px; font-size: 11px; font-weight: 700; }
.icon-button { width: 42px; border-radius: 50%; font: 700 17px/1 'DM Sans', sans-serif; }
.shortcut-button { font-size: 16px; }
.shortcut-button[aria-expanded="true"] { border-color: var(--green); background: var(--green); color: white; }
.header-button:hover, .header-button:focus-visible, .icon-button:hover, .icon-button:focus-visible { border-color: var(--green); background: var(--white); outline: none; transform: translateY(-1px); }
.shortcut-button[aria-expanded="true"]:hover, .shortcut-button[aria-expanded="true"]:focus-visible { background: var(--green); }

.shortcuts-panel { position: fixed; z-index: 40; top: 74px; right: clamp(16px, 3.2vw, 52px); width: min(92vw, 390px); padding: 24px 24px 20px; border: 1px solid var(--green); background: rgba(255,253,247,.98); box-shadow: 7px 9px 0 rgba(23,45,41,.16), 0 24px 65px rgba(23,45,41,.18); opacity: 0; pointer-events: none; transform: translateY(-8px) rotate(.4deg); transition: opacity .18s ease, transform .18s ease; }
.shortcuts-panel::before { content: ''; position: absolute; inset: 8px; border: 1px dashed rgba(23,107,80,.2); pointer-events: none; }
.shortcuts-panel.open { opacity: 1; pointer-events: auto; transform: translateY(0) rotate(.4deg); }
.shortcuts-heading { position: relative; z-index: 1; display: flex; align-items: start; justify-content: space-between; margin-bottom: 13px; }
.shortcuts-heading h2 { margin: 3px 0 0; font-size: 20px; }
.shortcuts-heading button { width: 32px; height: 32px; border: 0; border-radius: 50%; background: transparent; cursor: pointer; font-size: 22px; line-height: 1; }
.shortcuts-heading button:hover, .shortcuts-heading button:focus-visible { background: var(--paper-2); outline: 1px solid var(--green); }
.shortcut-list { position: relative; z-index: 1; margin: 0; }
.shortcut-list > div { min-height: 42px; display: grid; grid-template-columns: minmax(155px, 1fr) 1fr; align-items: center; gap: 12px; border-top: 1px dashed var(--line); }
.shortcut-list dt { display: flex; align-items: center; gap: 4px; margin: 0; }
.shortcut-list dd { margin: 0; color: var(--muted); font-size: 9px; }
.shortcut-list i { color: var(--muted); font-size: 8px; font-style: normal; }
.shortcut-list dt > span { font-size: 9px; font-weight: 700; }
kbd { min-width: 25px; display: inline-grid; place-content: center; border: 1px solid rgba(23,45,41,.34); border-bottom-width: 2px; border-radius: 3px; padding: 3px 6px; background: var(--white); box-shadow: 0 1px 0 rgba(23,45,41,.1); font: 700 8px/1.2 'DM Sans', sans-serif; }
.shortcuts-panel > p { position: relative; z-index: 1; margin: 12px 0 0; color: var(--muted); font-size: 8px; line-height: 1.6; }

.workspace { position: relative; display: grid; grid-template-columns: minmax(0, 1fr) 44px minmax(0, 1fr); align-items: start; gap: clamp(12px, 2vw, 28px); padding: clamp(20px, 3vw, 42px) clamp(18px, 4vw, 64px); }
.piece-layer { position: absolute; z-index: 5; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.work-panel { min-width: 0; }
.panel-heading { min-height: 48px; display: flex; justify-content: space-between; align-items: center; gap: 14px; margin-bottom: 10px; }
.panel-heading > div:first-child { display: flex; align-items: center; gap: 10px; min-width: 0; }
.panel-heading h2 { margin: 0; font-size: 14px; letter-spacing: .04em; white-space: nowrap; }
.step-number { width: 29px; height: 29px; display: grid; place-content: center; flex: none; border-radius: 50%; background: var(--green); color: white; font: 700 9px/1 'DM Sans', sans-serif; }
.step-number.coral { background: var(--coral); }
.source-actions { display: flex; gap: 8px; }
.text-button { min-height: 36px; display: inline-flex; align-items: center; border: 0; border-bottom: 1px dashed var(--green); padding: 0 3px; background: transparent; color: var(--green); cursor: pointer; font-size: 10px; font-weight: 700; }
.text-button:hover, .text-button:focus-visible { color: var(--coral); border-color: var(--coral); outline: none; }
.canvas-frame { position: relative; overflow: hidden; border: 1px solid rgba(23,45,41,.27); background: var(--white); box-shadow: var(--shadow); }
.source-stage { width: 100%; aspect-ratio: 3 / 2; }
.source-stage canvas, .board-stage canvas { display: block; width: 100%; height: 100%; touch-action: none; }
.source-stage.panning canvas { cursor: grabbing; }
.source-zoom { position: absolute; z-index: 2; right: 10px; bottom: 10px; display: flex; align-items: center; gap: 7px; border: 1px solid rgba(23,45,41,.22); border-radius: 3px; padding: 5px 7px; background: rgba(255,253,247,.88); color: var(--muted); opacity: 0; pointer-events: none; transform: translateY(4px); transition: opacity .18s, transform .18s; }
.source-zoom.visible { opacity: 1; transform: translateY(0); }
.source-zoom b { color: var(--green); font: 700 10px/1 'DM Sans', sans-serif; }
.source-zoom span { font-size: 7px; font-weight: 700; }
.knife-tip { position: absolute; left: 50%; top: 50%; display: flex; align-items: center; gap: 9px; transform: translate(-50%, -50%) rotate(-4deg); padding: 10px 13px; border-radius: 4px; background: rgba(255,253,247,.91); box-shadow: 3px 4px 0 rgba(23,45,41,.14); color: var(--green); pointer-events: none; transition: opacity .2s; }
.knife-tip.hidden { opacity: 0; }
.knife-tip b { font-size: 10px; line-height: 1.5; }
.knife-icon { color: var(--coral); font-size: 20px; transform: rotate(-18deg); }
.cut-flash { position: absolute; width: 28px; height: 28px; border: 3px solid var(--yellow); border-radius: 50%; opacity: 0; pointer-events: none; }
.cut-flash.pop { animation: cutPop .42s ease-out; }
@keyframes cutPop { from { opacity: 1; transform: scale(.5); } to { opacity: 0; transform: scale(2.4); } }
.panel-footer { min-height: 58px; display: flex; align-items: center; gap: 13px; padding: 8px 0; }
.panel-footer p { flex: 1; margin: 0; color: var(--muted); font-size: 9px; line-height: 1.5; }
.tool-chip { display: flex; align-items: center; gap: 7px; border: 1px solid var(--line); padding: 7px 10px; background: rgba(255,255,255,.42); font-size: 9px; white-space: nowrap; }
.tool-chip.active { border-color: var(--green); box-shadow: inset 0 0 0 1px var(--green); }
.blade { display: block; width: 19px; height: 8px; background: linear-gradient(135deg, transparent 28%, var(--coral) 29% 65%, transparent 66%); transform: rotate(-28deg); }
.cuts-left { width: 46px; height: 46px; display: grid; flex: none; place-content: center; border: 1px dashed var(--green); border-radius: 50%; text-align: center; transform: rotate(3deg); }
.cuts-left span { font: 700 17px/1 'DM Sans', sans-serif; }
.cuts-left small { margin-top: 3px; font-size: 7px; }
.mobile-only { display: none; }
.transfer-arrow { position: relative; min-height: 380px; display: grid; place-items: center; color: var(--coral); }
.transfer-arrow::before { content: ''; position: absolute; left: 3px; right: 3px; top: 50%; border-top: 2px dashed rgba(239,104,79,.42); }
.transfer-arrow::after { content: ''; position: absolute; right: 3px; top: calc(50% - 4px); width: 8px; height: 8px; border-top: 2px solid var(--coral); border-right: 2px solid var(--coral); transform: rotate(45deg); }
.transfer-arrow span { z-index: 1; padding: 7px 0; background: var(--paper); transform: rotate(-10deg); }
.guide-toggle { min-height: 36px; display: flex; align-items: center; gap: 7px; border: 0; background: transparent; color: var(--muted); cursor: pointer; font-size: 9px; font-weight: 700; }
.guide-toggle span { width: 25px; height: 14px; position: relative; border-radius: 99px; background: #b8b9b2; transition: .2s; }
.guide-toggle span::after { content: ''; position: absolute; width: 10px; height: 10px; left: 2px; top: 2px; border-radius: 50%; background: white; transition: .2s; }
.guide-toggle.active { color: var(--green); }
.guide-toggle.active span { background: var(--green); }
.guide-toggle.active span::after { left: 13px; }
.board-wrap { min-height: min(62vh, 610px); display: grid; place-items: center; }
.board-stage { --board-ratio: .75; width: min(100%, calc(62vh * var(--board-ratio))); max-height: 62vh; aspect-ratio: var(--board-ratio); transition: width .24s ease, aspect-ratio .24s ease; }
.empty-board { position: absolute; inset: 0; display: grid; place-content: center; color: rgba(23,107,80,.36); text-align: center; pointer-events: none; transition: opacity .24s; }
.empty-board.hidden { opacity: 0; }
.empty-board i { font-style: normal; font-size: 36px; }
.empty-board p { margin: 8px 0 0; font-size: 10px; line-height: 1.75; }
.board-help { margin: 8px auto 0; color: var(--muted); font-size: 9px; line-height: 1.55; text-align: center; }
.edit-toolbar { width: min(100%, 760px); display: grid; grid-template-columns: repeat(10, 1fr); margin: 10px auto 0; border: 1px solid var(--line); background: rgba(255,255,255,.45); }
.edit-toolbar button { min-width: 0; height: 51px; display: grid; place-content: center; gap: 3px; border: 0; border-right: 1px solid var(--line); background: transparent; cursor: pointer; }
.edit-toolbar button:last-child { border-right: 0; }
.edit-toolbar button:hover, .edit-toolbar button:focus-visible { background: #dceae1; outline: none; }
.edit-toolbar button:disabled { opacity: .25; cursor: not-allowed; }
.edit-toolbar span { font: 700 19px/1 Arial, sans-serif; }
.edit-toolbar small { font-size: 7px; white-space: nowrap; }
.edit-toolbar .danger:hover { background: #f5c7be; }

.bottom-bar { min-height: 82px; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 22px; padding: 12px clamp(18px, 3vw, 48px); border-top: 1px solid var(--line); background: rgba(250,247,238,.96); }
.privacy-note { display: flex; align-items: center; gap: 11px; min-width: 0; }
.privacy-note > span { width: 38px; height: 38px; display: grid; place-content: center; flex: none; border: 1px dashed var(--green); border-radius: 50%; color: var(--green); font-size: 21px; }
.privacy-note p, .privacy-note b, .privacy-note small { display: block; margin: 0; }
.privacy-note b { color: var(--green); font-size: 9px; }
.privacy-note small { margin-top: 3px; overflow: hidden; color: var(--muted); font-size: 8px; text-overflow: ellipsis; white-space: nowrap; }
.piece-progress { min-width: 145px; display: flex; align-items: baseline; justify-content: center; gap: 7px; }
.piece-progress span { font-size: 9px; }
.piece-progress b { min-width: 28px; color: var(--green); font: 700 21px/1 'DM Sans', sans-serif; text-align: center; }
.piece-progress small { color: var(--muted); font-size: 8px; }
.finish-button { justify-self: end; width: min(100%, 235px); height: 52px; display: flex; align-items: center; justify-content: space-between; border: 0; padding: 0 8px 0 20px; background: var(--ink); box-shadow: 4px 5px 0 var(--coral); color: white; cursor: pointer; font-weight: 700; transition: .15s; }
.finish-button:hover, .finish-button:focus-visible { outline: 2px dashed var(--yellow); outline-offset: 4px; transform: translate(2px, 2px); box-shadow: 2px 3px 0 var(--coral); }
.finish-button i { width: 35px; height: 35px; display: grid; place-content: center; border-radius: 50%; background: var(--coral); font-style: normal; font-size: 19px; }

.modal { position: fixed; inset: 0; z-index: 50; display: none; place-items: center; padding: 20px; }
.modal.open { display: grid; animation: modalIn .22s ease both; }
@keyframes modalIn { from { opacity: 0; } }
.modal-backdrop { position: absolute; inset: 0; background: rgba(12,31,27,.74); backdrop-filter: blur(6px); }
.modal-card { position: relative; z-index: 1; background: var(--paper); box-shadow: 0 30px 90px rgba(0,0,0,.3); }
.modal-card::before { content: ''; position: absolute; inset: 10px; border: 1px dashed rgba(23,107,80,.24); pointer-events: none; }
.modal-close { position: absolute; z-index: 3; right: 14px; top: 14px; width: 38px; height: 38px; border: 0; border-radius: 50%; background: transparent; cursor: pointer; font-size: 25px; }
.intro-card { width: min(94vw, 720px); padding: 31px 52px 34px; text-align: center; }
.intro-card h2 { margin: 8px 0; font-size: clamp(27px, 4vw, 43px); line-height: 1.38; letter-spacing: .04em; }
.intro-card h2 em { border-bottom: 3px dashed var(--coral); color: var(--coral); font-style: normal; }
.intro-card > p { margin: 12px auto 20px; color: var(--muted); font-size: 12px; line-height: 1.9; }
.intro-art { width: 230px; height: 88px; position: relative; margin: 0 auto 9px; }
.intro-art i { position: absolute; display: block; }
.intro-art i:nth-child(1) { width: 84px; height: 55px; left: 20px; bottom: 3px; background: var(--green); clip-path: polygon(0 22%, 85% 0, 100% 78%, 23% 100%); transform: rotate(-8deg); }
.intro-art i:nth-child(2) { width: 72px; height: 66px; right: 24px; top: 10px; background: var(--coral); clip-path: polygon(26% 0, 100% 18%, 76% 100%, 0 74%); transform: rotate(8deg); }
.intro-art i:nth-child(3) { width: 62px; height: 62px; left: 86px; top: 0; border-radius: 50%; background: var(--yellow); }
.intro-art span { position: absolute; z-index: 2; left: 99px; bottom: 0; font-size: 25px; transform: rotate(-13deg); }
.howto { list-style: none; display: grid; grid-template-columns: repeat(3,1fr); margin: 0 0 20px; padding: 16px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.howto li { display: grid; grid-template-columns: auto 1fr; gap: 0 8px; padding: 2px 18px; border-right: 1px dashed var(--line); text-align: left; }
.howto li:last-child { border-right: 0; }
.howto span { grid-row: span 2; width: 27px; height: 27px; display: grid; place-content: center; border-radius: 50%; background: var(--green); color: white; font: 700 10px 'DM Sans', sans-serif; }
.howto b { font-size: 11px; }
.howto small { margin-top: 4px; color: var(--muted); font-size: 8px; }
.primary-button, .secondary-button, .video-button { min-height: 50px; border: 0; padding: 0 21px; cursor: pointer; font-weight: 700; }
.primary-button { min-width: 225px; background: var(--ink); box-shadow: 4px 4px 0 var(--coral); color: white; }
.primary-button span { margin-left: 16px; color: var(--yellow); }
.primary-button.full { width: 100%; }
.secondary-button { border: 1px solid var(--ink); background: transparent; }
.video-button { border: 1px solid var(--green); background: #dfeadf; color: var(--green); }
.intro-note { display: block; margin-top: 13px; color: var(--muted); font-size: 8px; }

.settings-card { width: min(95vw, 760px); max-height: 94vh; overflow: auto; padding: 34px 42px 38px; }
.settings-card h2 { margin: 5px 0 24px; font-size: 28px; }
.setting-group { margin: 0 0 23px; padding: 0; border: 0; }
.setting-group legend { width: 100%; margin-bottom: 11px; padding-bottom: 8px; border-bottom: 1px solid var(--line); font-size: 11px; font-weight: 700; }
.ratio-grid { display: grid; grid-template-columns: repeat(5,1fr); gap: 8px; }
.ratio-grid label { min-height: 108px; display: grid; place-items: center; align-content: center; gap: 5px; border: 1px solid var(--line); background: rgba(255,255,255,.36); cursor: pointer; }
.ratio-grid input { position: absolute; opacity: 0; }
.ratio-grid label:has(input:checked) { border-color: var(--green); background: #dfeadf; box-shadow: inset 0 0 0 1px var(--green); }
.ratio-grid i { width: 39px; max-height: 47px; aspect-ratio: var(--r); border: 2px solid currentColor; background: var(--white); }
.ratio-grid b { font: 700 12px 'DM Sans', sans-serif; }
.ratio-grid small { color: var(--muted); font-size: 7px; }
.limit-options { display: grid; grid-template-columns: 1fr 1fr auto; gap: 9px; }
.limit-options > label { min-height: 65px; display: flex; align-items: center; gap: 9px; border: 1px solid var(--line); padding: 10px 12px; background: rgba(255,255,255,.36); cursor: pointer; }
.limit-options > label:has(input:checked) { border-color: var(--green); background: #dfeadf; }
.limit-options b, .limit-options small { display: block; }
.limit-options b { font-size: 10px; }.limit-options small { margin-top: 4px; color: var(--muted); font-size: 8px; }
.number-field { min-height: 65px; display: flex; align-items: center; border: 1px solid var(--line); background: var(--white); padding: 8px 11px; }
.number-field input { width: 62px; border: 0; border-bottom: 1px solid var(--green); background: transparent; padding: 5px; text-align: right; font: 700 15px 'DM Sans', sans-serif; }
.number-field input:focus { outline: 2px solid rgba(23,107,80,.25); }
.number-field input:disabled { opacity: .35; }
.number-field span { margin-left: 5px; font-size: 9px; white-space: nowrap; }
.api-note { display: flex; align-items: center; gap: 13px; margin: 0 0 22px; border: 1px dashed var(--blue); padding: 12px 14px; background: rgba(91,145,168,.1); }
.api-note > span { flex: none; color: var(--blue); font: 700 9px 'DM Sans', sans-serif; letter-spacing: .12em; }
.api-note p, .api-note b, .api-note small { display: block; margin: 0; }
.api-note b { font-size: 9px; }.api-note small { margin-top: 4px; color: var(--muted); font-size: 8px; }

.result-card { width: min(96vw, 920px); padding: 36px; }
.result-ribbon { position: absolute; z-index: 4; left: 50%; top: -15px; transform: translateX(-50%) rotate(-1deg); padding: 8px 26px; background: var(--coral); box-shadow: 3px 3px 0 var(--yellow); color: white; font: 700 10px 'DM Sans', sans-serif; letter-spacing: .16em; white-space: nowrap; }
.result-layout { display: grid; grid-template-columns: minmax(280px,.95fr) 1fr; gap: 45px; align-items: center; }
.result-preview { width: 100%; max-height: 72vh; position: relative; display: grid; place-items: center; background: white; padding: 10px; box-shadow: 5px 7px 0 rgba(23,45,41,.12); transform: rotate(-1deg); }
.result-preview canvas { display: block; max-width: 100%; max-height: calc(72vh - 20px); width: auto; height: auto; }
.tape { position: absolute; width: 74px; height: 20px; left: 50%; transform: translateX(-50%) rotate(2deg); background: rgba(239,210,126,.72); }
.tape.top { top: -6px; }.tape.bottom { bottom: -6px; }
.result-copy h2 { margin: 7px 0 22px; font-size: clamp(26px,3.2vw,39px); line-height: 1.35; }
.title-field { display: grid; gap: 7px; color: var(--muted); font-size: 8px; font-weight: 700; }
.title-field input { width: 100%; border: 0; border-bottom: 2px solid var(--green); background: transparent; padding: 9px 2px; color: var(--ink); font-size: 15px; }
.title-field input:focus { outline: 0; border-color: var(--coral); }
.artwork-meta { margin: 20px 0; }
.artwork-meta div { display: flex; justify-content: space-between; border-bottom: 1px dashed var(--line); padding: 8px 0; font-size: 10px; }
.artwork-meta dd { margin: 0; font: 700 11px 'DM Sans', sans-serif; }
.result-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; }
.result-actions .primary-button { min-width: 0; }
.result-actions .secondary-button { grid-column: 1 / -1; }
.video-help { display: block; margin-top: 10px; color: var(--muted); font-size: 8px; }
.toast { position: fixed; z-index: 80; left: 50%; bottom: 96px; max-width: min(90vw, 520px); transform: translate(-50%,20px); opacity: 0; pointer-events: none; padding: 12px 18px; background: var(--ink); box-shadow: 3px 3px 0 var(--coral); color: white; font-size: 10px; text-align: center; transition: .22s; }
.toast.show { opacity: 1; transform: translate(-50%,0); }

@media (max-width: 980px) {
  .topbar { grid-template-columns: auto 1fr auto; gap: 14px; }
  .brand > div { display: none; }
  .workspace { padding-inline: 17px; }
  .board-wrap { min-height: min(54vh, 540px); }
  .board-stage { width: min(100%, calc(54vh * var(--board-ratio))); max-height: 54vh; }
}

@media (max-width: 760px) {
  .app-shell { display: block; padding-bottom: 90px; }
  .topbar { position: sticky; z-index: 15; top: 0; min-height: 66px; grid-template-columns: auto 1fr auto; padding: 9px 12px; }
  .brand-mark { width: 37px; height: 37px; }
  .studio-heading { text-align: left; }
  .studio-heading .eyebrow { display: none; }
  .studio-heading h1 { font-size: 11px; white-space: normal; }
  .header-button { width: 40px; min-height: 40px; overflow: hidden; justify-content: center; padding: 0; font-size: 0; }
  .header-button span { font-size: 16px; }
  .icon-button { width: 40px; min-height: 40px; }
  #helpButton { display: none; }
  .shortcuts-panel { top: 60px; right: 10px; max-height: calc(100vh - 78px); overflow: auto; }
  .workspace { display: block; padding: 17px 12px 26px; }
  .source-panel { margin-bottom: 25px; }
  .transfer-arrow { min-height: 28px; margin-bottom: 16px; transform: rotate(90deg); }
  .transfer-arrow span { background: var(--paper); }
  .board-wrap { min-height: 0; }
  .board-stage { width: min(100%, calc(76vh * var(--board-ratio))); max-height: 76vh; }
  .panel-heading h2 { font-size: 12px; }
  .desktop-only { display: none; }.mobile-only { display: inline; }
  .bottom-bar { position: fixed; z-index: 14; left: 0; right: 0; bottom: 0; min-height: 76px; grid-template-columns: 1fr auto; padding: 9px 12px max(10px, env(safe-area-inset-bottom)); box-shadow: 0 -10px 30px rgba(23,45,41,.13); }
  .privacy-note { display: none; }
  .piece-progress { min-width: 100px; justify-content: flex-start; }
  .piece-progress small { display: none; }
  .finish-button { width: 174px; height: 46px; font-size: 10px; }
  .finish-button i { width: 30px; height: 30px; }
  .edit-toolbar button { height: 50px; }
  .edit-toolbar small { display: none; }
  .intro-card { max-height: 94vh; overflow: auto; padding: 25px 22px 28px; }
  .intro-card > p br { display: none; }
  .intro-art { height: 68px; transform: scale(.78); margin-top: -5px; margin-bottom: 0; }
  .howto { grid-template-columns: 1fr; padding: 7px 0; }
  .howto li { border-right: 0; border-bottom: 1px dashed var(--line); padding: 7px 18px; }
  .howto li:last-child { border-bottom: 0; }
  .settings-card { padding: 30px 20px 25px; }
  .ratio-grid { grid-template-columns: repeat(5, minmax(54px,1fr)); overflow-x: auto; }
  .ratio-grid label { min-height: 94px; }
  .limit-options { grid-template-columns: 1fr 1fr; }
  .number-field { grid-column: 1 / -1; }
  .result-card { max-height: 94vh; overflow: auto; padding: 30px 20px 20px; }
  .result-ribbon { top: 0; }
  .result-layout { grid-template-columns: 1fr 1fr; gap: 20px; align-items: start; }
  .result-copy h2 { font-size: 21px; }
  .result-preview { max-height: 65vh; }
  .result-preview canvas { max-height: calc(65vh - 20px); }
  .result-actions { grid-template-columns: 1fr; }
  .result-actions .secondary-button { grid-column: auto; }
}

@media (max-width: 540px) {
  #soundButton { display: none; }
  .shortcuts-panel { width: calc(100vw - 20px); padding: 21px 18px 17px; }
  .shortcut-list > div { grid-template-columns: minmax(140px, 1fr) 1fr; }
  .source-actions .text-button:last-child { display: none; }
  .result-layout { display: block; }
  .result-preview { width: min(82%, 340px); max-height: 44vh; margin: 0 auto 25px; }
  .result-preview canvas { max-height: calc(44vh - 20px); }
  .ratio-grid { grid-template-columns: repeat(3,1fr); }
  .limit-options { display: block; }
  .limit-options > label { margin-bottom: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; scroll-behavior: auto !important; }
}