:root {
  --bg: #050913;
  --bg-2: #081120;
  --panel: #070d18;
  --panel-2: #0a1220;
  --line: #1f3048;
  --line-strong: #2a4467;
  --text: #c0d3f0;
  --text-dim: #8fa9cd;
  --text-bright: #eef6ff;
  --cyan: #1df4ff;
  --cyan-soft: rgba(29, 244, 255, 0.18);
  --red: #d74f58;
  --red-soft: rgba(215, 79, 88, 0.18);
  --green: #8ed46a;
  --green-soft: rgba(142, 212, 106, 0.2);
  --ship: #6f7889;
  --ship-bright: #8e98aa;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.42);
  --placement-board-width: 399px;
  --board-axis: 24px;
  --board-cell: 22px;
  --board-gap: 3px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "JetBrains Mono", "Consolas", "Courier New", monospace;
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(17, 34, 58, 0.38), transparent 30%),
    linear-gradient(180deg, #03060d 0%, #050913 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.2;
  background:
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 24px 24px;
}

.hidden {
  display: none !important;
}

.page-shell {
  width: min(1080px, calc(100vw - 24px));
  margin: 0 auto;
  padding: 16px 0 28px;
}

.panel,
.winner-modal {
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.panel,
.winner-modal {
  background: linear-gradient(180deg, rgba(9, 17, 31, 0.96), rgba(5, 9, 19, 0.98));
}

.panel {
  border-radius: 0;
}

.eyebrow,
.meta-label {
  display: inline-block;
  color: var(--text-dim);
  font-size: 0.72rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
}

.app-grid {
  display: grid;
  gap: 12px;
}

.panel {
  padding: 16px;
}

.panel-head h2,
.board-header h2 {
  margin: 0;
  color: var(--text-bright);
  font-size: 1rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
}

.panel-head p,
.board-header .meta-label {
  margin: 6px 0 0;
  color: var(--text);
}

.lobby-panel {
  min-height: calc(100vh - 44px);
  display: grid;
  place-items: center;
  border: none;
  box-shadow: none;
  background: transparent;
  padding: 0;
}

.lobby-shell {
  width: min(100%, 420px);
  display: grid;
  gap: 18px;
}

.lobby-brand {
  text-align: center;
  display: grid;
  gap: 10px;
}

.lobby-brand h1 {
  margin: 0;
  color: var(--text-bright);
  font-size: clamp(2rem, 3.6vw, 3rem);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.lobby-subtitle {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.82rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
}

.lobby-description {
  margin: 0;
  color: var(--text);
  font-size: 0.88rem;
  line-height: 1.65;
}

.lobby-switcher {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  padding: 4px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.05);
}

.lobby-tab {
  padding: 10px 12px;
  color: var(--text-bright);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  background: transparent;
}

.lobby-tab.active {
  color: #06131c;
  border-color: rgba(29, 244, 255, 0.34);
  background: rgba(29, 244, 255, 0.92);
}

.lobby-highlights {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}

.lobby-mode {
  display: grid;
  gap: 12px;
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: linear-gradient(180deg, rgba(9, 17, 31, 0.82), rgba(6, 10, 18, 0.7));
}

.lobby-mode-head {
  display: grid;
  gap: 6px;
}

.lobby-mode-head h2 {
  margin: 0;
  color: var(--text-bright);
  font-size: 0.92rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.lobby-mode-head p,
.lobby-footnote {
  margin: 0;
  color: var(--text);
  font-size: 0.8rem;
  line-height: 1.6;
}

.lobby-feedback {
  min-height: 20px;
  text-align: center;
  padding: 0 6px;
}

.field {
  display: grid;
  gap: 8px;
  margin-bottom: 14px;
}

.ship-toolbar,
.modal-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

input,
button {
  border: 1px solid var(--line-strong);
  border-radius: 0;
  font: inherit;
}

input {
  width: 100%;
  padding: 12px 14px;
  color: var(--text-bright);
  background: rgba(255, 255, 255, 0.05);
}

input::placeholder {
  color: #9db1cf;
}

input:focus {
  outline: none;
  border-color: rgba(29, 244, 255, 0.35);
  box-shadow: 0 0 0 1px rgba(29, 244, 255, 0.15);
}

button {
  padding: 12px 14px;
  cursor: pointer;
  color: var(--text-bright);
  background: #132238;
  transition: border-color 120ms ease, color 120ms ease, background-color 120ms ease;
}

button:hover {
  border-color: rgba(29, 244, 255, 0.42);
  color: var(--text-bright);
  background: #18304f;
}

.primary {
  color: #041018;
  border-color: rgba(29, 244, 255, 0.58);
  background: linear-gradient(180deg, #73fbff, #22d7f1);
}

.secondary {
  background: rgba(255, 255, 255, 0.1);
}

.ghost {
  background: rgba(255, 255, 255, 0.04);
}

button.primary:hover {
  color: #041018;
  background: linear-gradient(180deg, #95fdff, #34e1f7);
}

button:disabled {
  cursor: not-allowed;
  color: rgba(238, 246, 255, 0.62);
  border-color: rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.05);
  box-shadow: none;
}

button.primary:disabled {
  color: rgba(4, 16, 24, 0.62);
  background: linear-gradient(180deg, rgba(115, 251, 255, 0.48), rgba(34, 215, 241, 0.42));
}

.wide {
  width: 100%;
}

.link-button {
  padding: 0;
  border: none;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  background: transparent;
}

.link-button:hover {
  border: none;
  color: var(--text);
}

.status-panel {
  display: grid;
  grid-template-columns: minmax(180px, 240px) 1fr minmax(180px, 240px);
  align-items: center;
  gap: 14px;
  min-height: 36px;
  padding: 6px 18px;
  margin-left: calc(50% - 50vw);
  margin-right: calc(50% - 50vw);
  border-left: none;
  border-right: none;
}

.status-segment {
  min-width: 0;
}

.status-room strong,
.status-player strong {
  display: block;
  color: var(--text-bright);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.status-inline,
.status-badges {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.status-inline .primary {
  padding: 8px 10px;
  font-size: 0.72rem;
}

.status-inline .ghost {
  padding: 8px 10px;
  font-size: 0.72rem;
}

.status-center {
  text-align: center;
}

.status-center #phaseLabel {
  margin: 0;
  color: var(--cyan);
  font-size: clamp(0.92rem, 2vw, 1.2rem);
  letter-spacing: 0.28em;
  text-transform: uppercase;
}

.status-center #statusText {
  display: none;
  margin: 6px 0 0;
  color: var(--text);
  font-size: 0.82rem;
}

.status-center #statusText.is-visible {
  display: block;
}

.status-player {
  text-align: right;
}

.status-player .meta-label,
.status-room .meta-label,
.status-badges {
  display: none;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 6px 10px;
  border: 1px solid var(--line-strong);
  color: var(--text);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  background: rgba(255, 255, 255, 0.08);
}

.badge.ready {
  color: var(--green);
  border-color: rgba(142, 212, 106, 0.28);
  background: var(--green-soft);
}

.ghost-badge {
  color: var(--text);
}

.controls-panel {
  display: grid;
  gap: 12px;
  max-width: 760px;
  margin: 0 auto;
  padding-top: 4px;
  border: none;
  box-shadow: none;
  background: transparent;
}

.waiting-panel {
  max-width: 760px;
  margin: 0 auto;
  padding-top: 40px;
  border: none;
  box-shadow: none;
  background: transparent;
}

.waiting-shell {
  display: grid;
  gap: 12px;
  justify-items: center;
  padding: 28px 32px;
  text-align: center;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: linear-gradient(180deg, rgba(12, 22, 38, 0.82), rgba(7, 12, 22, 0.56));
}

.waiting-shell h2 {
  margin: 0;
  color: var(--cyan);
  font-size: clamp(1rem, 2.2vw, 1.35rem);
  letter-spacing: 0.24em;
  text-transform: uppercase;
}

.waiting-shell p {
  margin: 0;
  max-width: 520px;
  color: var(--text);
  line-height: 1.7;
  font-size: 0.9rem;
}

.placement-panel {
  max-width: 1100px;
  margin: 0 auto;
  border: none;
  box-shadow: none;
  background: transparent;
  padding-top: 28px;
  display: grid;
  justify-items: center;
}

.placement-shell {
  display: grid;
  gap: 16px;
  width: max-content;
  max-width: 100%;
}

.placement-top {
  display: grid;
  gap: 12px;
  width: 100%;
}

.setup-overview {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) auto;
  gap: 18px;
  align-items: end;
  padding: 10px 14px 12px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: linear-gradient(180deg, rgba(12, 22, 38, 0.84), rgba(7, 12, 22, 0.58));
}

.setup-copy h2 {
  margin: 8px 0 0;
  color: var(--text-bright);
  font-size: 1rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.setup-stats {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.setup-stat {
  display: grid;
  gap: 4px;
  min-width: 136px;
  padding: 8px 10px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.05);
}

.setup-stat strong {
  color: var(--text-bright);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.setup-instructions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}

.setup-instructions-compact {
  display: none;
  margin: 0;
  color: var(--text);
  font-size: 0.76rem;
  line-height: 1.5;
  text-align: center;
}

.tip-pill {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 6px 10px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--text-bright);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  background: rgba(255, 255, 255, 0.07);
}

.placement-grid {
  display: grid;
  grid-template-columns: auto minmax(320px, 360px);
  gap: 28px;
  align-items: stretch;
  width: fit-content;
  margin: 0 auto;
}

.placement-board-column {
  display: grid;
  justify-items: center;
}

.placement-sidebar {
  min-height: 0;
  display: grid;
  justify-items: center;
  width: 100%;
}

.placement-sidebar-content {
  display: grid;
  align-content: start;
  gap: 12px;
  height: 100%;
  max-height: 100%;
  min-height: 0;
  width: 100%;
  justify-items: stretch;
  overflow: auto;
  padding-right: 6px;
}

.placement-sidebar-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.placement-title {
  margin: 0;
  color: var(--text);
  font-size: 0.68rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
}

.placement-fleet-list {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 14px;
}

.placement-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.placement-actions-sidebar {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  grid-template-areas:
    "randomize remove"
    "clear submit";
  gap: 10px;
  padding-top: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.placement-actions-sidebar > button {
  width: 100%;
  min-height: 58px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  line-height: 1.35;
  white-space: normal;
}

.action-randomize {
  grid-area: randomize;
}

.action-remove {
  grid-area: remove;
}

.action-clear {
  grid-area: clear;
}

.action-submit {
  grid-area: submit;
}

.compact-button {
  width: fit-content;
  min-width: 0;
  padding: 8px 12px;
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.placement-actions:not(.placement-actions-sidebar) > button:not(.placement-submit) {
  width: fit-content;
}

.placement-submit {
  width: 100%;
  min-width: 0;
}

.control-stack {
  display: grid;
  gap: 12px;
}

.fleet-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.fleet-group {
  display: grid;
  gap: 5px;
}

.fleet-group-title {
  color: var(--text);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.fleet-group-items {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
}

.ship-mini {
  padding: 0;
  border: none;
  background: transparent;
  box-shadow: none;
  color: var(--text);
}

.ship-mini:hover {
  border: none;
  color: var(--text-bright);
}

.ship-mini-shape {
  display: grid;
  grid-template-columns: repeat(var(--mini-cols), 7px);
  grid-template-rows: repeat(var(--mini-rows), 7px);
  gap: 2px;
}

.ship-mini-shape span {
  width: 7px;
  height: 7px;
}

.ship-mini-shape .is-filled {
  border: 1px solid var(--text-dim);
  background: rgba(255, 255, 255, 0.16);
}

.ship-mini-shape .is-empty {
  border: 1px solid transparent;
  background: transparent;
}

.ship-mini.placed .is-filled {
  border-color: rgba(142, 212, 106, 0.42);
  background: rgba(142, 212, 106, 0.5);
}

.ship-mini.selected .is-filled {
  border-color: rgba(29, 244, 255, 0.45);
  background: rgba(29, 244, 255, 0.55);
  box-shadow: 0 0 8px rgba(29, 244, 255, 0.18);
}

.setup-tip,
.battle-hint,
.feedback {
  margin: 0;
  color: var(--text);
  font-size: 0.84rem;
  text-align: center;
}

.finished-actions {
  display: grid;
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--line-strong);
  background: rgba(29, 244, 255, 0.04);
}

.boards-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(430px, 1fr));
  justify-content: center;
  gap: 54px;
  width: fit-content;
  margin: 0 auto;
  position: relative;
}

.boards-grid::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 18px;
  left: 50%;
  width: 1px;
  background: rgba(255, 255, 255, 0.05);
  transform: translateX(-50%);
}

.boards-panel {
  min-height: calc(100vh - 150px);
  padding: 56px 0 0;
  border: none;
  box-shadow: none;
  background: transparent;
}

.board-card {
  display: grid;
  gap: 12px;
  padding: 0 18px;
  border: none;
  background: transparent;
  align-content: start;
}

.board-header {
  text-align: center;
}

.board-header .meta-label {
  margin-top: 8px;
}

.board-wrap {
  overflow-x: auto;
  padding-bottom: 4px;
  display: flex;
  justify-content: center;
}

.placement-board-column .board-wrap,
.placement-board-column .board-grid,
.placement-board-column .cell {
  touch-action: none;
}

.board-grid {
  display: grid;
  grid-template-columns: var(--board-axis) repeat(15, var(--board-cell));
  grid-auto-rows: var(--board-cell);
  gap: var(--board-gap);
  width: fit-content;
  margin: 0 auto;
}

.axis {
  display: grid;
  place-items: center;
  color: var(--text);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
}

.axis-top,
.axis-side {
  color: var(--text);
}

.corner {
  opacity: 0;
}

.cell {
  position: relative;
  width: var(--board-cell);
  height: var(--board-cell);
  padding: 0;
  border: 1px solid rgba(74, 112, 152, 0.85);
  background: #040913;
}

.cell.empty,
.cell.unknown {
  background: #040913;
}

.cell.is-clickable:hover {
  border-color: rgba(29, 244, 255, 0.34);
  background: rgba(29, 244, 255, 0.05);
}

.cell.ship {
  background: var(--ship);
  border-color: rgba(255, 255, 255, 0.08);
}

.cell.preview-valid {
  background: rgba(29, 244, 255, 0.22);
  border-color: rgba(29, 244, 255, 0.38);
}

.cell.preview-invalid {
  background: rgba(215, 79, 88, 0.18);
  border-color: rgba(215, 79, 88, 0.34);
}

.cell.miss {
  background-color: #040913;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M3 10c1.5 0 1.5-1 3-1s1.5 1 3 1 1.5-1 3-1 1.5 1 3 1 1.5-1 3-1 1.5 1 3 1' fill='none' stroke='%239ab2d8' stroke-width='1.6' stroke-linecap='round'/%3E%3Cpath d='M5 15c1.5 0 1.5-1 3-1s1.5 1 3 1 1.5-1 3-1 1.5 1 3 1 1.5-1 3-1' fill='none' stroke='%23617392' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  background-size: 15px 15px;
}

.cell.hit {
  background: var(--ship-bright);
  border-color: rgba(255, 255, 255, 0.16);
}

.cell.sunk {
  background: var(--red);
  border-color: rgba(255, 255, 255, 0.12);
}

.fleet-gallery {
  display: grid;
  gap: 10px;
  padding: 10px 2px 0;
}

.fleet-gallery-head {
  text-align: center;
}

.fleet-rows {
  display: grid;
  gap: 8px;
  max-width: 360px;
  width: 100%;
  margin: 0 auto;
}

.fleet-row {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px;
  align-items: center;
}

.fleet-row-symbol {
  display: inline-flex;
  gap: 2px;
}

.fleet-row-symbol span {
  width: 10px;
  height: 10px;
  border: 1px solid var(--text-dim);
  background: var(--ship);
}

.fleet-row-copy {
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex-wrap: wrap;
}

.fleet-row-copy strong,
.fleet-row-copy span {
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.fleet-row-copy strong {
  color: var(--text-bright);
}

.fleet-row-copy span {
  color: var(--text);
}

.fleet-row.is-ready .fleet-row-copy span,
.fleet-row.is-ready .fleet-row-symbol span {
  color: var(--green);
  border-color: rgba(142, 212, 106, 0.34);
}

.fleet-row.is-hit .fleet-row-copy span,
.fleet-row.is-hit .fleet-row-symbol span {
  color: var(--red);
  border-color: rgba(215, 79, 88, 0.4);
}

.fleet-row.is-lost .fleet-row-copy strong,
.fleet-row.is-lost .fleet-row-copy span {
  color: var(--red);
}

.fleet-row.is-lost .fleet-row-symbol span {
  background: var(--red);
  border-color: rgba(215, 79, 88, 0.4);
}

.history-panel {
  padding-top: 14px;
}

.history-list {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 8px;
  color: var(--text);
  font-size: 0.84rem;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(1, 3, 8, 0.8);
  opacity: 0;
  transition: opacity 220ms ease;
}

.winner-modal {
  width: min(100%, 520px);
  padding: 26px;
  transform: translateY(18px) scale(0.97);
  opacity: 0;
  transition:
    transform 260ms cubic-bezier(0.2, 0.8, 0.2, 1),
    opacity 220ms ease,
    border-color 180ms ease,
    box-shadow 180ms ease;
  box-shadow:
    0 24px 80px rgba(0, 0, 0, 0.48),
    inset 0 0 0 1px rgba(255, 255, 255, 0.02);
}

.modal-backdrop.is-open {
  opacity: 1;
}

.modal-backdrop.is-open .winner-modal {
  transform: translateY(0) scale(1);
  opacity: 1;
}

.winner-modal.victory {
  border-color: rgba(29, 244, 255, 0.34);
  box-shadow:
    0 24px 80px rgba(0, 0, 0, 0.48),
    0 0 28px rgba(29, 244, 255, 0.08);
}

.winner-modal.defeat {
  border-color: rgba(215, 79, 88, 0.34);
  box-shadow:
    0 24px 80px rgba(0, 0, 0, 0.48),
    0 0 28px rgba(215, 79, 88, 0.08);
}

.winner-modal h2 {
  margin: 12px 0;
  color: var(--text-bright);
  font-size: clamp(1.8rem, 4vw, 2.7rem);
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.winner-modal.victory h2 {
  color: var(--cyan);
}

.winner-modal.defeat h2 {
  color: #ff7880;
}

.winner-modal p {
  margin: 0 0 18px;
  color: #c2d3ee;
  line-height: 1.75;
  font-size: 0.95rem;
}

.modal-actions .ghost {
  color: var(--text);
}

@media (max-width: 980px) {
  .waiting-panel {
    padding-top: 20px;
  }

  .waiting-shell {
    padding: 20px 16px;
  }

  .placement-shell {
    width: 100%;
    justify-items: center;
    gap: 10px;
  }

  .setup-overview {
    grid-template-columns: 1fr;
    align-items: start;
    gap: 8px;
    padding: 8px 10px;
  }

  .setup-copy .meta-label {
    display: none;
  }

  .setup-copy h2 {
    margin-top: 0;
    font-size: 0.86rem;
    letter-spacing: 0.14em;
    text-align: center;
  }

  .setup-stats {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    justify-content: stretch;
  }

  .setup-stat {
    min-width: 0;
    padding: 6px 8px;
  }

  .setup-stat .meta-label {
    font-size: 0.56rem;
    letter-spacing: 0.16em;
  }

  .setup-stat strong {
    font-size: 0.72rem;
  }

  .status-panel {
    grid-template-columns: 1fr;
    text-align: left;
  }

  .status-center,
  .status-player {
    text-align: left;
  }

  .boards-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .placement-grid {
    grid-template-columns: 1fr;
    gap: 18px;
    width: 100%;
    justify-items: center;
  }

  .placement-board-column {
    width: 100%;
    max-width: 100%;
  }

  .placement-sidebar {
    width: var(--placement-board-width);
    max-width: 100%;
  }

  .placement-sidebar-content {
    overflow: visible;
    padding-right: 0;
    margin: 0 auto;
  }

  .placement-top {
    width: 100%;
    max-width: 100%;
    gap: 8px;
  }

  .setup-instructions {
    display: none;
  }

  .setup-instructions-compact {
    display: block;
  }

  .placement-fleet-list {
    grid-template-columns: repeat(auto-fit, minmax(96px, 1fr));
    gap: 6px 10px;
  }

  .boards-grid::before {
    display: none;
  }

  .status-panel {
    margin-left: 0;
    margin-right: 0;
    border-left: 1px solid var(--line);
    border-right: 1px solid var(--line);
  }

  .boards-panel {
    padding-top: 20px;
  }

  .board-card {
    width: 100%;
    padding: 0;
  }

  #opponentBoard {
    --board-axis: 16px;
    --board-gap: 1px;
    --board-cell: clamp(16px, calc((100vw - 34px - 16px - 15px) / 15), 23px);
  }

  #placementBoard {
    --board-axis: 16px;
    --board-gap: 1px;
    --board-cell: clamp(16px, calc((100vw - 34px - 16px - 15px) / 15), 23px);
  }

  #selfBoard {
    --board-axis: 14px;
    --board-gap: 1px;
    --board-cell: clamp(13px, calc((100vw - 76px - 14px - 15px) / 15), 19px);
  }
}

@media (max-width: 640px) {
  :root {
    --placement-board-width: 305px;
  }

  .page-shell {
    width: 100%;
    padding: 8px 0 20px;
  }

  .panel {
    padding: 10px;
  }

  .lobby-shell {
    width: min(100%, 360px);
    gap: 14px;
  }

  .lobby-brand h1 {
    font-size: 2.5rem;
  }

  .lobby-highlights {
    display: grid;
    grid-template-columns: 1fr;
  }

  .lobby-mode {
    padding: 14px;
  }

  .setup-instructions-compact {
    display: block;
  }

  .status-panel {
    gap: 10px;
    padding: 8px 10px;
  }

  .controls-panel {
    gap: 8px;
  }

  .board-header h2 {
    font-size: 0.88rem;
    letter-spacing: 0.2em;
  }

  .board-header .meta-label {
    margin-top: 6px;
    font-size: 0.62rem;
    letter-spacing: 0.22em;
  }

  .board-wrap {
    padding-bottom: 0;
  }

  body.battle-phase .status-panel {
    padding: 6px 8px;
    gap: 8px;
  }

  body.battle-phase .controls-panel {
    padding: 0 10px;
    gap: 4px;
  }

  body.battle-phase .controls-panel .panel-head h2 {
    font-size: 0.76rem;
    letter-spacing: 0.14em;
  }

  body.battle-phase .controls-panel .panel-head p {
    margin-top: 4px;
    font-size: 0.72rem;
    line-height: 1.45;
  }

  body.battle-phase .battle-hint {
    font-size: 0.76rem;
    line-height: 1.45;
  }

  body.battle-phase .boards-panel {
    padding-top: 8px;
    min-height: 0;
  }

  body.battle-phase .boards-grid {
    gap: 8px;
  }

  #opponentBoard {
    --board-axis: 15px;
    --board-gap: 1px;
    --board-cell: clamp(16px, calc((100vw - 24px - 15px - 15px) / 15), 21px);
  }

  #placementBoard {
    --board-axis: 15px;
    --board-gap: 1px;
    --board-cell: clamp(16px, calc((100vw - 24px - 15px - 15px) / 15), 21px);
  }

  body.battle-phase #opponentBoard {
    --board-axis: 14px;
    --board-gap: 1px;
    --board-cell: clamp(17px, calc((100vw - 16px - 14px - 15px) / 15), 22px);
  }

  #selfBoard {
    --board-axis: 13px;
    --board-gap: 1px;
    --board-cell: clamp(12px, calc((100vw - 52px - 13px - 15px) / 15), 17px);
  }

  .fleet-row-copy {
    gap: 4px;
  }

  .placement-fleet-list {
    grid-template-columns: repeat(auto-fit, minmax(92px, 1fr));
    gap: 6px 8px;
  }

  .placement-sidebar-content {
    gap: 10px;
  }

  .ship-chip-copy strong {
    font-size: 0.64rem;
    letter-spacing: 0.1em;
  }

  .placement-actions-sidebar > button,
  .placement-submit {
    width: 100%;
    margin-left: 0;
  }

  .placement-actions-sidebar {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    grid-template-areas:
      "randomize remove"
      "clear submit";
    gap: 8px;
    padding-top: 10px;
  }

  .compact-button {
    width: fit-content;
    padding: 7px 10px;
  }

  .placement-sidebar-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding-bottom: 6px;
  }
}