.krd-app {
	--krd-navy: #071f4b;
	--krd-blue: #1263dc;
	--krd-blue-light: #27a6da;
	--krd-border: #d8dee8;
	--krd-text: #101828;
	--krd-muted: #5d6878;
	--krd-bg: #f5f8fc;
	max-width: 920px;
	margin: 24px auto;
	padding: 20px;
	color: var(--krd-text);
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif;
	line-height: 1.65;
}

.krd-app *, .krd-app *::before, .krd-app *::after { box-sizing: border-box; }
.krd-app [hidden] { display: none !important; }
.krd-app button, .krd-app input { font: inherit; }
.krd-app h2, .krd-app h3, .krd-app p { margin-top: 0; }
.krd-app h2 { color: var(--krd-navy); font-size: clamp(23px, 4vw, 31px); line-height: 1.45; }
.krd-app h3 { color: var(--krd-navy); }

.krd-app .krd-screen {
	max-width: 690px;
	margin: 0 auto;
	background: #fff;
	border: 1px solid var(--krd-border);
	border-radius: 22px;
	box-shadow: 0 12px 38px rgba(12, 38, 75, .10);
	overflow: hidden;
}

.krd-app .krd-screen:not(.krd-intro) { padding: clamp(22px, 5vw, 42px); }
.krd-app .krd-screen-header { margin-bottom: 30px; }
.krd-app .krd-screen-header > div:first-child { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.krd-app .krd-screen-header h2 { margin: 0; }
.krd-app .krd-step-number { color: var(--krd-navy); font-size: 17px; font-weight: 800; white-space: nowrap; }
.krd-app .krd-step-track { height: 9px; margin-top: 14px; overflow: hidden; background: #e6eaf0; border-radius: 999px; }
.krd-app .krd-step-track span { display: block; height: 100%; background: linear-gradient(90deg, var(--krd-blue), #4cc6cc); border-radius: inherit; transition: width .25s ease; }

.krd-app .krd-brand {
	display: flex;
	align-items: center;
	justify-content: center;
	gap: 11px;
	min-height: 102px;
	color: var(--krd-navy);
	font-size: 15px;
	line-height: 1.35;
}

.krd-app .krd-brand strong { font-size: 22px; }
.krd-app .krd-brand-icon { display: grid; width: 50px; height: 50px; place-items: center; border: 2px solid #5471a0; border-radius: 50%; color: var(--krd-blue); font-size: 28px; }
.krd-app .krd-hero-visual { position: relative; display: flex; height: 150px; align-items: center; justify-content: center; overflow: hidden; background: linear-gradient(115deg, #edf8ff, #fff2f8); }
.krd-app .krd-hero-visual::after { position: absolute; right: -10%; bottom: -45px; left: -10%; height: 85px; background: rgba(255,255,255,.6); border-radius: 50%; content: ""; }
.krd-app .krd-microphone { z-index: 1; filter: drop-shadow(0 9px 8px rgba(15, 40, 80, .17)); font-size: 76px; transform: rotate(-12deg); }
.krd-app .krd-note { position: absolute; font-weight: 800; }
.krd-app .krd-note-1 { top: 25px; left: 15%; color: #2ca8da; font-size: 31px; transform: rotate(-12deg); }
.krd-app .krd-note-2 { bottom: 25px; left: 26%; color: #45bc83; font-size: 24px; }
.krd-app .krd-note-3 { top: 22px; right: 24%; color: #efa442; font-size: 27px; }
.krd-app .krd-note-4 { right: 12%; bottom: 25px; color: #ee6e91; font-size: 31px; transform: rotate(10deg); }
.krd-app .krd-intro-body { padding: clamp(26px, 6vw, 48px); text-align: center; }
.krd-app .krd-intro-body h2 { margin-bottom: 14px; font-size: clamp(26px, 5vw, 36px); }
.krd-app .krd-eyebrow { margin-bottom: 8px; color: var(--krd-blue); font-size: 14px; font-weight: 800; letter-spacing: .04em; }
.krd-app .krd-intro-copy { max-width: 520px; margin: 0 auto 28px; color: var(--krd-muted); }
.krd-app .krd-feature-list { display: grid; max-width: 430px; margin: 0 auto 30px; padding: 0; gap: 13px; text-align: left; list-style: none; }
.krd-app .krd-feature-list li { display: flex; align-items: center; gap: 13px; }
.krd-app .krd-feature-list span { display: grid; flex: 0 0 34px; height: 34px; place-items: center; border-radius: 50%; background: #edf4ff; color: var(--krd-blue); font-size: 19px; }
.krd-app .krd-intro-note { margin: 16px 0 0; color: #718096; font-size: 12px; }

.krd-app .krd-section-lead { margin-bottom: 26px; color: var(--krd-muted); }
.krd-app fieldset { margin: 0 0 30px; padding: 0; border: 0; }
.krd-app legend { width: 100%; margin-bottom: 13px; color: var(--krd-navy); font-weight: 800; }
.krd-app legend > span { display: inline-grid; width: 25px; height: 25px; margin-right: 5px; place-items: center; border-radius: 50%; background: var(--krd-navy); color: #fff; font-size: 13px; }
.krd-app legend small { color: var(--krd-muted); font-size: 12px; font-weight: 500; }
.krd-app .krd-choice { position: relative; display: block; margin: 9px 0; }
.krd-app .krd-choice input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.krd-app .krd-choice > span {
	display: flex;
	min-height: 52px;
	align-items: center;
	justify-content: center;
	padding: 12px 15px;
	border: 1px solid #cbd3df;
	border-radius: 10px;
	background: #fff;
	color: var(--krd-text);
	font-weight: 600;
	cursor: pointer;
	transition: border-color .15s ease, background .15s ease, box-shadow .15s ease;
}
.krd-app .krd-choice input:checked + span { border: 2px solid var(--krd-blue); background: #edf5ff; color: #0c53bb; box-shadow: 0 0 0 2px rgba(18, 99, 220, .08); }
.krd-app .krd-choice input:focus-visible + span { outline: 3px solid #f3ad16; outline-offset: 2px; }
.krd-app .krd-choice-with-icon > span { justify-content: flex-start; }
.krd-app .krd-choice-with-icon i { display: grid; width: 34px; height: 34px; margin-right: 13px; place-items: center; border-radius: 50%; background: #eaf2ff; color: var(--krd-blue); font-size: 19px; font-style: normal; }
.krd-app .krd-chip-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.krd-app .krd-chip { margin: 0; }
.krd-app .krd-chip > span { min-height: 42px; padding: 8px; border-radius: 999px; font-size: 13px; }
.krd-app .krd-two-column { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.krd-app .krd-two-column .krd-choice { margin: 0; }

.krd-app .krd-primary, .krd-app .krd-secondary {
	min-height: 54px;
	padding: 13px 24px;
	border-radius: 999px;
	font-weight: 800;
	cursor: pointer;
}
.krd-app .krd-primary { width: 100%; border: 0; background: linear-gradient(100deg, #1168e8, #225fe0); color: #fff; box-shadow: 0 8px 20px rgba(22, 100, 222, .20); }
.krd-app .krd-secondary { border: 1px solid var(--krd-blue); background: #fff; color: var(--krd-blue); }
.krd-app .krd-primary:hover { filter: brightness(.96); }
.krd-app .krd-primary:focus-visible, .krd-app .krd-secondary:focus-visible, .krd-app .krd-choice-button:focus-visible, .krd-app .krd-back:focus-visible { outline: 3px solid #f3ad16; outline-offset: 3px; }
.krd-app .krd-primary:disabled, .krd-app .krd-secondary:disabled, .krd-app .krd-choice-button:disabled { opacity: .58; cursor: wait; }
.krd-app .krd-form-actions { display: grid; grid-template-columns: minmax(110px, .55fr) 1.45fr; gap: 12px; }
.krd-app .krd-form-actions .krd-primary { width: auto; }
.krd-app .krd-error { margin: 12px 0; color: #b42318; font-weight: 700; }

.krd-app .krd-question-head { display: flex; width: 100%; align-items: center; justify-content: space-between; }
.krd-app .krd-question-head strong { color: #0f52b4; }
.krd-app .krd-song-card { margin: 24px 0; padding: 25px 20px; border: 1px solid var(--krd-border); border-radius: 14px; background: linear-gradient(180deg, #fff, #fafcff); text-align: center; box-shadow: 0 5px 15px rgba(20, 50, 90, .06); }
.krd-app .krd-song-card h2 { margin-bottom: 3px; }
.krd-app .krd-artist { margin-bottom: 8px; font-size: 17px; font-weight: 700; }
.krd-app .krd-meta { margin: 0; color: var(--krd-muted); font-size: 12px; }
.krd-app .krd-audio-wrap { margin-top: 16px; padding-top: 14px; border-top: 1px solid #e4e8ef; }
.krd-app .krd-audio-wrap p { margin-bottom: 7px; color: var(--krd-blue); font-size: 12px; font-weight: 700; }
.krd-app .krd-audio-wrap audio { width: 100%; height: 38px; }
.krd-app .krd-prompt { max-width: 480px; margin: 0 auto 18px; color: var(--krd-navy); font-size: 18px; font-weight: 800; text-align: center; }
.krd-app .krd-answer-list { display: grid; gap: 9px; }
.krd-app .krd-choice-button { display: flex; width: 100%; min-height: 58px; align-items: center; gap: 13px; padding: 11px 15px; border: 1px solid #cbd3df; border-radius: 10px; background: #fff; color: var(--krd-text); font-weight: 700; text-align: left; cursor: pointer; }
.krd-app .krd-choice-button:hover, .krd-app .krd-choice-button.is-selected { border-color: var(--krd-blue); background: #f0f6ff; }
.krd-app .krd-answer-icon { display: grid; flex: 0 0 34px; height: 34px; place-items: center; border-radius: 50%; color: transparent; font-size: 0; }
.krd-app .krd-answer-icon::after { color: #fff; font-size: 19px; font-weight: 900; }
.krd-app .krd-answer-easy { background: #39ad72; }
.krd-app .krd-answer-easy::after { content: "✓"; }
.krd-app .krd-answer-slight { background: #e6a928; }
.krd-app .krd-answer-slight::after { content: "～"; }
.krd-app .krd-answer-hard { background: #ed7f30; }
.krd-app .krd-answer-hard::after { content: "!"; }
.krd-app .krd-answer-cannot { background: #e65050; }
.krd-app .krd-answer-cannot::after { content: "×"; }
.krd-app .krd-answer-unknown { background: #758195; color: #fff; font-size: 18px; }
.krd-app .krd-answer-unknown::after { content: ""; }
.krd-app .krd-back { margin-top: 20px; padding: 7px 0; border: 0; background: transparent; color: var(--krd-blue); font-weight: 700; text-decoration: none; cursor: pointer; }

.krd-app .krd-adjustment > h2 { margin-bottom: 7px; text-align: center; }
.krd-app .krd-adjustment-help { color: var(--krd-muted); font-size: 13px; text-align: center; }
.krd-app .krd-adjustment fieldset { margin-top: 22px; }
.krd-app .krd-key-change { padding-top: 22px; border-top: 1px solid #e2e7ee; }
.krd-app .krd-key-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 9px; }
.krd-app .krd-key-choice, .krd-app .krd-key-choice > span { margin: 0; }
.krd-app .krd-key-unknown { grid-column: 1 / -1; }

.krd-app .krd-result { max-width: 860px; }
.krd-app .krd-result-summary { margin-bottom: 18px; padding: clamp(24px, 5vw, 38px); border: 1px solid #b9d0ed; border-radius: 14px; background: linear-gradient(135deg, #fbfdff, #f1f7ff); text-align: center; }
.krd-app .krd-result-summary > p:first-child { margin-bottom: 4px; color: var(--krd-navy); font-weight: 700; }
.krd-app .krd-result-note { margin: 4px 0 8px; color: var(--krd-navy); font-size: clamp(34px, 8vw, 57px); font-weight: 900; line-height: 1.25; letter-spacing: -.025em; }
.krd-app .krd-result-note strong { color: var(--krd-blue); }
.krd-app .krd-result-description { max-width: 600px; margin: 0 auto; color: var(--krd-muted); }
.krd-app .krd-pitch-guide { display: grid; grid-template-columns: auto auto 1fr; align-items: center; gap: 12px; margin-bottom: 28px; padding: 15px 18px; border-radius: 12px; background: var(--krd-navy); color: #fff; }
.krd-app .krd-pitch-guide > span { font-weight: 700; }
.krd-app .krd-pitch-guide strong { display: grid; min-width: 52px; height: 42px; place-items: center; border-radius: 9px; background: #fff; color: var(--krd-blue); font-size: 24px; }
.krd-app .krd-pitch-guide small { color: #dbe8ff; line-height: 1.45; }
.krd-app .krd-range-section { margin: 28px 0; }
.krd-app .krd-range-section h3 { margin-bottom: 11px; }
.krd-app .krd-range-legend { display: flex; flex-wrap: wrap; gap: 9px; margin-bottom: 10px; font-size: 12px; font-weight: 800; }
.krd-app .krd-range-legend span { padding: 4px 11px; border-radius: 999px; }
.krd-app .krd-range-legend .is-stable { background: #dff5e7; color: #177a40; }
.krd-app .krd-range-legend .is-practical { background: #e0edff; color: #1256b8; }
.krd-app .krd-range-legend .is-challenge { background: #fff0dc; color: #b55716; }
.krd-app .krd-keyboard { display: grid; height: 96px; grid-template-columns: repeat(25, 1fr); align-items: start; overflow: hidden; border: 1px solid #aeb7c4; border-radius: 7px; background: #fff; }
.krd-app .krd-piano-key { position: relative; height: 100%; border-right: 1px solid #c5cbd3; background: #fff; }
.krd-app .krd-piano-key.is-black { z-index: 1; height: 61%; border: 0; background: #182130; box-shadow: inset 0 -3px 0 #070b11; }
.krd-app .krd-piano-key.is-stable { box-shadow: inset 0 -12px 0 #82d69f; }
.krd-app .krd-piano-key.is-practical { box-shadow: inset 0 -12px 0 #4d91eb; }
.krd-app .krd-piano-key.is-challenge { box-shadow: inset 0 -12px 0 #ef9c52; }
.krd-app .krd-piano-key.is-black.is-stable { box-shadow: inset 0 -9px 0 #50b979; }
.krd-app .krd-piano-key.is-black.is-practical { box-shadow: inset 0 -9px 0 #3579d2; }
.krd-app .krd-piano-key.is-black.is-challenge { box-shadow: inset 0 -9px 0 #de7834; }
.krd-app .krd-piano-key.is-current::after { position: absolute; right: 50%; bottom: 14px; width: 9px; height: 9px; border: 2px solid #fff; border-radius: 50%; background: #0c5ed4; box-shadow: 0 0 0 2px #0c5ed4; content: ""; transform: translateX(50%); }
.krd-app .krd-keyboard-labels { display: grid; grid-template-columns: 1fr 1fr 1fr; margin-top: 7px; color: var(--krd-muted); font-size: 11px; }
.krd-app .krd-keyboard-labels strong { color: var(--krd-blue); text-align: center; }
.krd-app .krd-keyboard-labels span:last-child { text-align: right; }
.krd-app .krd-range-help { margin: 12px 0 0; color: var(--krd-muted); font-size: 12px; }
.krd-app .krd-result-meta { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 26px 0; }
.krd-app .krd-result-meta div { padding: 15px; border: 1px solid var(--krd-border); border-radius: 12px; text-align: center; }
.krd-app .krd-result-meta dt { color: var(--krd-muted); font-size: 12px; }
.krd-app .krd-result-meta dd { margin: 3px 0 0; color: var(--krd-navy); font-size: 20px; font-weight: 800; }
.krd-app .krd-result-notice { padding: 14px 16px; border-radius: 10px; background: #f7f8fa; color: var(--krd-muted); font-size: 12px; }
.krd-app .krd-guide { margin: 26px 0; padding: 22px; border: 1px solid #e0e5eb; border-radius: 14px; background: #fbfcfe; }
.krd-app .krd-guide h3 { margin-bottom: 9px; }
.krd-app .krd-guide ol { margin: 0; padding-left: 1.4em; }
.krd-app .krd-guide li { margin: 7px 0; }
.krd-app .krd-guide img { display: block; max-width: 100%; height: auto; margin: 17px auto 0; border-radius: 8px; }
.krd-app .krd-share-section { margin: 28px 0; padding: 23px; border: 1px solid #cbd9ec; border-radius: 14px; background: linear-gradient(135deg, #f8fbff, #fff); }
.krd-app .krd-share-section h3 { margin-bottom: 5px; }
.krd-app .krd-share-section > p { margin-bottom: 17px; color: var(--krd-muted); font-size: 13px; }
.krd-app .krd-share-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.krd-app .krd-share-actions button { display: flex; width: 100%; align-items: center; justify-content: center; gap: 9px; }
.krd-app .krd-share-actions button span { font-size: 21px; line-height: 1; }
.krd-app .krd-share-status { min-height: 1.5em; margin: 12px 0 0 !important; color: #177a40 !important; font-weight: 700; text-align: center; }
.krd-app .krd-share-status.is-error { color: #b42318 !important; }
.krd-app .krd-sr-only { position: absolute !important; width: 1px !important; height: 1px !important; margin: -1px !important; padding: 0 !important; overflow: hidden !important; clip: rect(0, 0, 0, 0) !important; border: 0 !important; white-space: nowrap !important; }

@media (max-width: 640px) {
	.krd-app { margin: 0 auto; padding: 8px; }
	.krd-app .krd-screen { border-radius: 16px; box-shadow: 0 5px 20px rgba(12, 38, 75, .09); }
	.krd-app .krd-screen:not(.krd-intro) { padding: 22px 15px 26px; }
	.krd-app .krd-brand { min-height: 86px; }
	.krd-app .krd-hero-visual { height: 132px; }
	.krd-app .krd-intro-body { padding: 25px 18px 30px; }
	.krd-app .krd-chip-grid { grid-template-columns: 1fr 1fr; }
	.krd-app .krd-two-column { grid-template-columns: 1fr; }
	.krd-app .krd-form-actions { grid-template-columns: 1fr; }
	.krd-app .krd-form-actions .krd-secondary { order: 2; }
	.krd-app .krd-choice > span, .krd-app .krd-choice-button { min-height: 56px; }
	.krd-app .krd-song-card { padding: 22px 14px; }
	.krd-app .krd-key-grid { grid-template-columns: 1fr 1fr; }
	.krd-app .krd-key-unknown { grid-column: 1 / -1; }
	.krd-app .krd-pitch-guide { grid-template-columns: 1fr auto; }
	.krd-app .krd-pitch-guide small { grid-column: 1 / -1; }
	.krd-app .krd-keyboard { height: 78px; }
	.krd-app .krd-result-meta { grid-template-columns: 1fr; }
	.krd-app .krd-share-actions { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
	.krd-app *, .krd-app *::before, .krd-app *::after { scroll-behavior: auto !important; transition: none !important; }
}