:root {
  --bg: #090b10;
  --panel: #11151d;
  --panel-raised: #171c25;
  --ink: #f4f0e8;
  --muted: #929baa;
  --line: #2a313d;
  --accent: #d6ff52;
  --accent-soft: rgba(214, 255, 82, 0.12);
  --blue: #8ea8ff;
  --danger: #ff786e;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --sans: Inter, Pretendard, "Noto Sans KR", Arial, sans-serif;
}
* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--bg);
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  background:
    linear-gradient(rgba(255, 255, 255, 0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.018) 1px, transparent 1px),
    var(--bg);
  background-size: 42px 42px;
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.5;
}

button,
input {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  color: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

button:focus-visible,
a:focus-visible,
input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.app-shell {
  width: min(1440px, calc(100% - 40px));
  min-height: 100vh;
  margin: 0 auto;
}

.site-header {
  min-height: 90px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  border-bottom: 1px solid var(--line);
}

.brand-button {
  display: inline-flex;
  width: fit-content;
  align-items: center;
  gap: 13px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  text-align: left;
}

.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border: 1px solid var(--accent);
  color: var(--accent);
  font: 800 12px/1 var(--mono);
  letter-spacing: -0.05em;
}

.brand-button strong,
.brand-button small {
  display: block;
}

.brand-button strong {
  font: 800 13px/1.2 var(--mono);
  letter-spacing: 0.08em;
}

.brand-button small {
  margin-top: 4px;
  color: var(--muted);
  font: 700 8px/1 var(--mono);
  letter-spacing: 0.16em;
}

.header-meta {
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--muted);
  font: 700 9px/1 var(--mono);
  letter-spacing: 0.13em;
}

.live-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 14px rgba(214, 255, 82, 0.7);
}

.enadiverse-link {
  justify-self: end;
  color: var(--muted);
  font: 700 10px/1 var(--mono);
  letter-spacing: 0.12em;
}

.enadiverse-link:hover,
.enadiverse-link:focus-visible {
  color: var(--accent);
}

.view {
  display: none;
  min-height: calc(100vh - 180px);
  padding: clamp(54px, 7vw, 106px) 0;
}

.view.is-active {
  display: block;
}

.eyebrow {
  margin: 0 0 20px;
  color: var(--accent);
  font: 750 10px/1 var(--mono);
  letter-spacing: 0.18em;
}

.primary-button,
.secondary-button,
.submit-answer,
.text-button,
.replay-button {
  min-height: 50px;
  border-radius: 0;
  cursor: pointer;
  font-weight: 800;
}

.primary-button,
.secondary-button {
  display: inline-flex;
  min-width: 220px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 0 18px;
}

.primary-button {
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #0a0d0c;
}

.primary-button:hover,
.primary-button:focus-visible {
  background: #e5ff91;
}

.secondary-button {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
}

.secondary-button:hover,
.secondary-button:focus-visible {
  border-color: var(--ink);
  background: rgba(255, 255, 255, 0.04);
}

.text-button {
  min-height: 42px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--muted);
  font: 750 10px/1 var(--mono);
  letter-spacing: 0.12em;
}

.text-button:hover,
.text-button:focus-visible {
  color: var(--accent);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(350px, 0.75fr);
  gap: clamp(48px, 8vw, 120px);
  align-items: center;
}

.hero-copy h1 {
  max-width: 900px;
  margin: 0;
  font-size: clamp(4.3rem, 10vw, 9.2rem);
  font-weight: 900;
  line-height: 0.8;
  letter-spacing: -0.085em;
}

.hero-copy h1 span {
  display: block;
  margin-left: clamp(32px, 8vw, 120px);
  color: transparent;
  -webkit-text-stroke: 1px rgba(244, 240, 232, 0.7);
}

.hero-description {
  max-width: 660px;
  margin: 42px 0 0;
  color: #adb5c2;
  font-size: clamp(0.98rem, 1.5vw, 1.14rem);
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 40px;
}

.listen-panel {
  min-height: 490px;
  padding: 34px;
  border: 1px solid var(--line);
  background: rgba(17, 21, 29, 0.9);
}

.listen-panel > p {
  margin: 42px 0 20px;
  color: var(--muted);
  font: 700 9px/1 var(--mono);
  letter-spacing: 0.15em;
}

.staff-lines {
  position: relative;
  height: 170px;
  display: grid;
  align-content: center;
  gap: 17px;
  overflow: hidden;
}

.staff-lines span {
  display: block;
  height: 1px;
  background: #3b4350;
}

.staff-lines b {
  position: absolute;
  top: 32px;
  left: 50%;
  color: var(--accent);
  font: 400 92px/1 Georgia, serif;
  transform: translateX(-50%);
}

.listen-panel dl {
  margin: 0;
  border-top: 1px solid var(--line);
}

.listen-panel dl div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.listen-panel dt {
  color: var(--muted);
  font: 700 9px/1 var(--mono);
  letter-spacing: 0.1em;
}

.listen-panel dd {
  margin: 0;
  font: 800 12px/1 var(--mono);
}

.principle-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 100px;
  border: 1px solid var(--line);
}

.principle-strip > div {
  min-height: 150px;
  padding: 24px;
}

.principle-strip > div + div {
  border-left: 1px solid var(--line);
}

.principle-strip span,
.principle-strip strong {
  display: block;
  font-family: var(--mono);
}

.principle-strip span {
  color: var(--accent);
  font-size: 9px;
}

.principle-strip strong {
  margin-top: 24px;
  font-size: 12px;
  letter-spacing: 0.08em;
}

.principle-strip p {
  margin: 9px 0 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.ad-slot {
  min-height: 110px;
  margin-top: 62px;
  display: grid;
  place-content: center;
  gap: 8px;
  border: 1px dashed #343d49;
  color: #596473;
  text-align: center;
}

.ad-slot span {
  font: 750 8px/1 var(--mono);
  letter-spacing: 0.16em;
}

.ad-slot p {
  margin: 0;
  font: 650 9px/1.4 var(--mono);
  letter-spacing: 0.08em;
}

.view-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 28px;
}

.view-heading h2,
.registered-view > h2 {
  margin: 0;
  font-size: clamp(2.8rem, 6vw, 6rem);
  line-height: 0.95;
  letter-spacing: -0.06em;
}

.view-intro {
  max-width: 640px;
  margin: 28px 0 0;
  color: var(--muted);
}

.tier-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-top: 52px;
}

.tier-card {
  min-height: 210px;
  padding: 22px;
  border: 1px solid var(--tier-line, var(--line));
  background: rgba(17, 21, 29, 0.72);
  color: var(--ink);
  cursor: pointer;
  text-align: left;
  transition: background 140ms ease, transform 140ms ease, border-color 140ms ease;
}

.tier-card:hover,
.tier-card:focus-visible,
.tier-card.is-selected {
  border-color: var(--tier-accent, var(--accent));
  background: var(--panel-raised);
  transform: translateY(-2px);
}

.tier-card.is-selected {
  box-shadow: inset 0 -3px 0 var(--tier-accent, var(--accent));
}

.tier-card span,
.tier-card strong,
.tier-card small {
  display: block;
}

.tier-card span {
  color: var(--tier-accent, var(--accent));
  font: 800 9px/1 var(--mono);
}

.tier-card strong {
  margin-top: 46px;
  font: 850 clamp(1.05rem, 1.8vw, 1.55rem)/1 var(--mono);
  letter-spacing: -0.04em;
}

.tier-card small {
  margin-top: 13px;
  color: var(--muted);
  font-size: 0.82rem;
}

.tier-bronze { --tier-accent: #c28b5e; --tier-line: #5b4534; }
.tier-silver { --tier-accent: #b9c3d3; --tier-line: #535c69; }
.tier-gold { --tier-accent: #f2c94c; --tier-line: #615329; }
.tier-platinum { --tier-accent: #7de0d3; --tier-line: #315955; }
.tier-diamond { --tier-accent: #85a8ff; --tier-line: #354a70; }
.tier-master { --tier-accent: #bf8cff; --tier-line: #50386e; }
.tier-grandmaster { --tier-accent: #ff8383; --tier-line: #6b363b; }
.tier-challenger { --tier-accent: #d6ff52; --tier-line: #526122; }

.tier-confirm {
  margin-top: 18px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px;
  align-items: center;
  padding: 30px;
  border: 1px solid var(--accent);
  background: var(--accent-soft);
}

.tier-confirm > div > p:first-child {
  margin: 0;
  color: var(--accent);
  font: 750 8px/1 var(--mono);
  letter-spacing: 0.14em;
}

.tier-confirm h3 {
  margin: 12px 0 0;
  font: 850 1.7rem/1 var(--mono);
}

.tier-confirm #selected-tier-description {
  margin: 12px 0 0;
  color: #b8c0cc;
}

.game-view {
  position: relative;
  padding-top: 30px;
}

.game-topbar {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.game-topbar > div,
.game-topbar > button {
  min-height: 82px;
  padding: 18px 20px;
  background: var(--bg);
}

.game-topbar span,
.game-topbar strong {
  display: block;
}

.game-topbar span {
  color: var(--muted);
  font: 700 8px/1 var(--mono);
  letter-spacing: 0.13em;
}

.game-topbar strong {
  margin-top: 10px;
  font: 850 16px/1 var(--mono);
}

.game-topbar .text-button {
  min-width: 100px;
}

.game-stage {
  min-height: 340px;
  display: grid;
  place-items: center;
  align-content: center;
  padding: 52px 20px;
  border-right: 1px solid var(--line);
  border-left: 1px solid var(--line);
  text-align: center;
}

.audio-orb {
  width: 118px;
  height: 118px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  border: 1px solid #414a58;
  border-radius: 50%;
  background: var(--panel);
}

.audio-orb span {
  width: 4px;
  height: 14px;
  background: #657080;
  transition: height 120ms ease, background 120ms ease;
}

.game-stage.is-playing .audio-orb span {
  background: var(--accent);
  animation: level 620ms ease-in-out infinite alternate;
}

.game-stage.is-playing .audio-orb span:nth-child(2) { animation-delay: -220ms; }
.game-stage.is-playing .audio-orb span:nth-child(3) { animation-delay: -420ms; }
.game-stage.is-playing .audio-orb span:nth-child(4) { animation-delay: -100ms; }
.game-stage.is-playing .audio-orb span:nth-child(5) { animation-delay: -330ms; }

@keyframes level {
  from { height: 12px; }
  to { height: 52px; }
}

.audio-state {
  margin: 25px 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.replay-button {
  min-width: 210px;
  margin-top: 24px;
  padding: 0 18px;
  border: 1px solid var(--line);
  background: transparent;
}

.replay-button span {
  margin-right: 9px;
}

.replay-button small {
  margin-left: 18px;
  color: var(--muted);
  font: 700 8px/1 var(--mono);
}

.replay-button:disabled {
  cursor: wait;
  opacity: 0.5;
}

.answer-panel {
  display: grid;
  gap: 24px;
  padding: 28px;
  border: 1px solid var(--line);
  background: rgba(17, 21, 29, 0.74);
}

.answer-label {
  margin: 0 0 12px;
  color: var(--muted);
  font: 750 9px/1 var(--mono);
  letter-spacing: 0.14em;
}

.answer-grid {
  display: grid;
  gap: 8px;
}

.note-grid {
  grid-template-columns: repeat(12, 1fr);
}

.chord-grid {
  grid-template-columns: repeat(5, 1fr);
}

.compact-grid {
  grid-template-columns: repeat(4, minmax(110px, 1fr));
}

.answer-option {
  min-height: 54px;
  padding: 8px;
  border: 1px solid #353d49;
  background: #0d1016;
  color: var(--ink);
  cursor: pointer;
  font: 800 11px/1.2 var(--mono);
}

.answer-option:hover,
.answer-option:focus-visible {
  border-color: #7e8999;
}

.answer-option.is-selected {
  border-color: var(--accent);
  background: var(--accent);
  color: #080a0d;
}

.form-error {
  min-height: 20px;
  margin: 0;
  color: var(--danger);
  font-size: 0.84rem;
}

.submit-answer {
  min-height: 58px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: #0a0c10;
}

.submit-answer:hover,
.submit-answer:focus-visible {
  border-color: var(--accent);
  background: var(--accent);
}

.submit-answer:disabled {
  cursor: wait;
  opacity: 0.55;
}

.feedback-layer {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(5, 7, 10, 0.78);
  backdrop-filter: blur(6px);
}

.feedback-card {
  width: min(520px, 100%);
  padding: 48px 30px;
  border: 1px solid var(--accent);
  background: var(--panel);
  text-align: center;
}

.feedback-card.is-wrong {
  border-color: var(--danger);
}

.feedback-card p {
  margin: 0;
  color: var(--accent);
  font: 850 14px/1 var(--mono);
  letter-spacing: 0.13em;
}

.feedback-card.is-wrong p {
  color: var(--danger);
}

.feedback-card strong {
  display: block;
  margin-top: 18px;
  font-size: 1.2rem;
}

.result-layout {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  min-height: 410px;
  border: 1px solid var(--line);
}

.result-main {
  padding: clamp(34px, 6vw, 76px);
}

.result-tier {
  margin: 42px 0 8px;
  color: var(--blue);
  font: 850 1.2rem/1 var(--mono);
}

.result-main h2 {
  margin: 0;
  font: 900 clamp(5rem, 12vw, 10rem)/0.9 var(--mono);
  letter-spacing: -0.09em;
}

.result-accuracy {
  margin: 30px 0 0;
  color: var(--muted);
}

.result-accuracy strong {
  color: var(--ink);
}

.result-stats {
  display: grid;
  margin: 0;
  border-left: 1px solid var(--line);
}

.result-stats div {
  display: grid;
  place-content: center;
  padding: 34px;
}

.result-stats div + div {
  border-top: 1px solid var(--line);
}

.result-stats dt {
  color: var(--muted);
  font: 750 9px/1 var(--mono);
  letter-spacing: 0.13em;
}

.result-stats dd {
  margin: 16px 0 0;
  font: 850 clamp(1.5rem, 3vw, 2.4rem)/1 var(--mono);
}

.nickname-form {
  display: grid;
  grid-template-columns: 1fr minmax(250px, 0.7fr);
  gap: 28px 44px;
  align-items: end;
  margin-top: 18px;
  padding: 34px;
  border: 1px solid var(--line);
  background: var(--panel);
}

.nickname-form h3 {
  margin: 0;
  font-size: 1.55rem;
}

.nickname-form > div > p:last-child {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.nickname-form label span {
  display: block;
  margin-bottom: 10px;
  color: var(--muted);
  font: 750 9px/1 var(--mono);
  letter-spacing: 0.12em;
}

.nickname-form input {
  width: 100%;
  min-height: 56px;
  padding: 0 15px;
  border: 1px solid #3a4351;
  border-radius: 0;
  background: #0b0e13;
  color: var(--ink);
  font: 800 16px/1 var(--mono);
}

.nickname-form .form-error,
.nickname-form .form-actions {
  grid-column: 1 / -1;
}

.form-actions,
.registered-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.registered-view {
  text-align: center;
}

.registered-card {
  width: min(820px, 100%);
  margin: 54px auto 0;
  border: 1px solid var(--line);
  background: var(--panel);
}

.registered-card dl {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 0;
}

.registered-card dl div {
  padding: 28px 18px;
}

.registered-card dl div + div {
  border-left: 1px solid var(--line);
}

.registered-card dt {
  color: var(--muted);
  font: 750 8px/1 var(--mono);
  letter-spacing: 0.12em;
}

.registered-card dd {
  margin: 15px 0 0;
  color: var(--accent);
  font: 850 1.1rem/1 var(--mono);
}

.registered-actions {
  justify-content: center;
  margin-top: 28px;
}

.ranking-filters {
  display: flex;
  gap: 8px;
  margin-top: 42px;
  padding-bottom: 10px;
  overflow-x: auto;
}

.ranking-filter {
  min-height: 42px;
  flex: 0 0 auto;
  padding: 0 14px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font: 750 9px/1 var(--mono);
}

.ranking-filter.is-active {
  border-color: var(--accent);
  background: var(--accent);
  color: #090b0f;
}

.ranking-status {
  min-height: 22px;
  margin: 26px 0 12px;
  color: var(--muted);
  font-size: 0.86rem;
}

.ranking-list {
  border-top: 1px solid var(--line);
}

.ranking-row {
  display: grid;
  grid-template-columns: 88px 160px 1fr 110px 130px 90px;
  gap: 14px;
  align-items: center;
  min-height: 76px;
  padding: 12px 16px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.ranking-row.is-top {
  background: rgba(214, 255, 82, 0.055);
}

.ranking-rank {
  color: var(--accent);
  font: 850 18px/1 var(--mono);
}

.ranking-tier {
  color: var(--muted);
  font: 750 9px/1.2 var(--mono);
}

.ranking-name {
  min-width: 0;
  overflow: hidden;
  font-weight: 800;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.ranking-score,
.ranking-time,
.ranking-replays {
  font: 750 11px/1 var(--mono);
}

.ranking-time,
.ranking-replays {
  color: var(--muted);
}

.ranking-empty {
  padding: 70px 20px;
  border: 1px solid var(--line);
  border-top: 0;
  color: var(--muted);
  text-align: center;
}

.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 22px;
  margin-top: 24px;
}

.pagination .secondary-button {
  min-width: 120px;
}

.pagination span {
  color: var(--muted);
  font: 750 10px/1 var(--mono);
}

.content-guide {
  margin-top: 76px;
  padding-top: 70px;
  border-top: 1px solid var(--line);
}

.guide-heading {
  max-width: 850px;
}

.guide-heading h2 {
  margin: 13px 0 20px;
  font-size: clamp(32px, 5vw, 62px);
  line-height: 0.98;
  letter-spacing: -0.06em;
}

.guide-heading > p:last-child,
.guide-grid article > p,
.guide-grid li,
.tier-guide-grid p {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.85;
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 38px;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.guide-grid article {
  min-width: 0;
  padding: 34px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.018);
}

.guide-number {
  color: var(--accent);
  font: 800 10px/1 var(--mono);
  letter-spacing: 0.12em;
}

.guide-grid h3,
.tier-guide h3 {
  margin: 14px 0 18px;
  font-size: 22px;
  letter-spacing: -0.035em;
}

.guide-grid p,
.guide-grid ol,
.tier-guide-grid p {
  margin: 0;
}

.guide-grid ol {
  padding-left: 20px;
}

.guide-grid li + li {
  margin-top: 7px;
}

.guide-grid a {
  color: var(--accent);
}

.tier-guide {
  margin-top: 52px;
}

.tier-guide-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.tier-guide-grid article {
  min-width: 0;
  padding: 24px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.tier-guide-grid strong {
  display: block;
  margin-bottom: 10px;
  color: var(--accent);
  font: 800 12px/1 var(--mono);
  letter-spacing: 0.06em;
}

footer {
  min-height: 90px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font: 700 8px/1.4 var(--mono);
  letter-spacing: 0.08em;
}

footer p {
  margin: 0;
  text-align: right;
}

.policy-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px 18px;
}

footer a:hover,
footer a:focus-visible {
  color: var(--accent);
}

[hidden] {
  display: none !important;
}

@media (max-width: 1060px) {
  .tier-guide-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .tier-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .note-grid {
    grid-template-columns: repeat(6, 1fr);
  }

  .ranking-row {
    grid-template-columns: 68px 120px 1fr 90px 110px;
  }

  .ranking-replays {
    display: none;
  }
}

@media (max-width: 820px) {
  .app-shell {
    width: min(100% - 28px, 1440px);
  }

  .site-header {
    grid-template-columns: 1fr auto;
  }

  .header-meta {
    display: none;
  }

  .hero-grid,
  .result-layout,
  .nickname-form {
    grid-template-columns: 1fr;
  }

  .listen-panel {
    min-height: auto;
  }

  .principle-strip {
    grid-template-columns: 1fr;
  }

  .principle-strip > div + div {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .guide-grid {
    grid-template-columns: 1fr;
  }

  .tier-confirm {
    grid-template-columns: 1fr;
  }

  .result-stats {
    grid-template-columns: repeat(2, 1fr);
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .result-stats div + div {
    border-top: 0;
    border-left: 1px solid var(--line);
  }

  .registered-card dl {
    grid-template-columns: repeat(2, 1fr);
  }

  .registered-card dl div:nth-child(3) {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .registered-card dl div:nth-child(4) {
    border-top: 1px solid var(--line);
  }

  .chord-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .nickname-form .form-error,
  .nickname-form .form-actions {
    grid-column: auto;
  }

  .ranking-row {
    grid-template-columns: 58px 1fr auto;
    gap: 8px 12px;
    padding: 16px;
  }

  .ranking-tier {
    grid-column: 2;
    grid-row: 2;
  }

  .ranking-score {
    grid-column: 3;
    grid-row: 1;
  }

  .ranking-time {
    grid-column: 3;
    grid-row: 2;
  }
}

@media (max-width: 560px) {
  .app-shell {
    width: min(100% - 20px, 1440px);
  }

  .site-header {
    min-height: 74px;
  }

  .brand-mark {
    width: 36px;
    height: 36px;
  }

  .brand-button strong {
    font-size: 11px;
  }

  .enadiverse-link {
    font-size: 8px;
  }

  .view {
    min-height: calc(100vh - 148px);
    padding: 48px 0;
  }

  .hero-copy h1 {
    font-size: clamp(3.7rem, 21vw, 6rem);
  }

  .hero-copy h1 span {
    margin-left: 0;
  }

  .hero-actions,
  .form-actions,
  .registered-actions {
    flex-direction: column;
  }

  .primary-button,
  .secondary-button {
    width: 100%;
  }

  .listen-panel,
  .answer-panel,
  .nickname-form {
    padding: 22px;
  }

  .principle-strip {
    margin-top: 62px;
  }

  .content-guide {
    margin-top: 54px;
    padding-top: 50px;
  }

  .guide-grid article {
    padding: 24px;
  }

  .tier-guide-grid {
    grid-template-columns: 1fr;
  }

  .view-heading {
    align-items: start;
    flex-direction: column;
  }

  .view-heading h2,
  .registered-view > h2 {
    font-size: clamp(2.7rem, 14vw, 4.2rem);
  }

  .tier-grid {
    grid-template-columns: 1fr;
  }

  .tier-card {
    min-height: 150px;
  }

  .tier-card strong {
    margin-top: 28px;
  }

  .game-topbar {
    grid-template-columns: 1fr 1fr;
  }

  .game-topbar > button {
    grid-column: 1 / -1;
    min-height: 48px;
  }

  .game-stage {
    min-height: 290px;
  }

  .note-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .chord-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .compact-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .answer-option {
    min-height: 58px;
  }

  .result-main {
    padding: 32px 22px;
  }

  .result-main h2 {
    font-size: clamp(4.8rem, 27vw, 8rem);
  }

  .result-stats dd {
    font-size: 1.25rem;
  }

  .registered-card dl {
    grid-template-columns: 1fr;
  }

  .registered-card dl div + div,
  .registered-card dl div:nth-child(3),
  .registered-card dl div:nth-child(4) {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .pagination {
    gap: 10px;
  }

  .pagination .secondary-button {
    width: auto;
    min-width: 96px;
  }

  footer {
    grid-template-columns: 1fr;
    gap: 18px;
    padding: 24px 0;
    text-align: center;
  }

  footer p {
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation: none !important;
    scroll-behavior: auto !important;
    transition: none !important;
  }
}