:root {
  --canvas: #ffffff;
  --ink: #0a0a0a;
  --charcoal: #242424;
  --slate: #6a6f76;
  --steel: #8a8f98;
  --surface: #f5f5f3;
  --surface-soft: #fafafa;
  --hairline: #dfdfdc;
  --hairline-soft: #eeeeeb;
  --coral: #ff674d;
  --magenta: #e5488b;
  --blue: #2f6df6;
  --purple: #7357ff;
  --success-bg: #eaf7ee;
  --success-text: #1d6f3a;
  --error: #d45656;
  --board: #dcb778;
  --board-line: rgba(30, 20, 10, 0.52);
  --radius-card: 16px;
  --radius-hero: 32px;
  --radius-pill: 9999px;
  --shadow-subtle: 0 1px 2px rgba(0, 0, 0, 0.04);
  font-family: "DM Sans", Inter, "Helvetica Neue", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--canvas);
  color: var(--ink);
  font-family: "DM Sans", Inter, "Helvetica Neue", Arial, sans-serif;
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  padding: 0 32px;
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--hairline-soft);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
}

.brand-button {
  padding: 0;
  border: 0;
  color: inherit;
  background: transparent;
}

.brand-mark {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 62% 38%, var(--canvas) 0 16%, transparent 17%),
    var(--ink);
  box-shadow: inset 0 0 0 1px var(--ink);
}

.connection-pill {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--hairline);
  color: var(--slate);
  font-size: 13px;
  font-weight: 600;
}

.connection-pill.online {
  background: var(--success-bg);
  border-color: transparent;
  color: var(--success-text);
}

.connection-pill.offline {
  background: #fff0f0;
  border-color: transparent;
  color: var(--error);
}

.app-shell {
  position: relative;
  width: min(1280px, calc(100vw - 48px));
  margin: 0 auto;
  padding: 64px 0;
}

.game-select,
.lobby {
  display: grid;
  gap: 48px;
}

.game-select,
.lobby,
.game-layout {
  transform-origin: 50% 20%;
}

.app-shell.is-view-transitioning {
  overflow: hidden;
  pointer-events: none;
}

.view-enter {
  position: relative;
  z-index: 2;
  animation: view-enter 360ms cubic-bezier(0.16, 1, 0.3, 1) both;
}

.view-exit {
  position: absolute;
  top: var(--view-exit-top);
  left: var(--view-exit-left);
  z-index: 1;
  width: var(--view-exit-width);
  pointer-events: none;
  animation: view-exit 220ms cubic-bezier(0.4, 0, 1, 1) both;
}

.view-enter .hero-copy,
.view-enter .game-card,
.view-enter .entry-panel,
.view-enter .game-main,
.view-enter .status-panel {
  animation: view-content-enter 420ms cubic-bezier(0.16, 1, 0.3, 1) both;
}

.view-enter .game-card:nth-child(2),
.view-enter .entry-panel:nth-child(2),
.view-enter .status-panel {
  animation-delay: 45ms;
}

.view-enter .game-card:nth-child(3),
.view-enter .entry-panel:nth-child(3) {
  animation-delay: 80ms;
}

.view-enter .game-card:nth-child(4) {
  animation-delay: 115ms;
}

@keyframes view-enter {
  from {
    opacity: 0;
    filter: blur(4px);
    transform: translateY(18px) scale(0.985);
  }

  to {
    opacity: 1;
    filter: blur(0);
    transform: translateY(0) scale(1);
  }
}

@keyframes view-exit {
  from {
    opacity: 1;
    filter: blur(0);
    transform: translateY(0) scale(1);
  }

  to {
    opacity: 0;
    filter: blur(3px);
    transform: translateY(-10px) scale(0.99);
  }
}

@keyframes view-content-enter {
  from {
    opacity: 0;
    transform: translateY(14px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-copy {
  max-width: 720px;
}

.eyebrow,
.panel-kicker {
  margin: 0 0 10px;
  color: var(--steel);
  font-size: 13px;
  font-weight: 700;
  line-height: 1.5;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 16px;
  font-size: clamp(42px, 7vw, 80px);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 12px;
  font-size: 24px;
  font-weight: 600;
  line-height: 1.3;
}

.lead {
  margin-bottom: 0;
  color: var(--slate);
  font-size: 18px;
  line-height: 1.5;
}

.entry-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 24px;
}

.lobby-heading {
  display: grid;
  justify-items: start;
  gap: 22px;
}

.game-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

.game-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 22px;
  min-height: 320px;
  padding: 30px;
  border: 0;
  border-radius: var(--radius-hero);
  color: #ffffff;
  text-align: left;
  box-shadow: var(--shadow-subtle);
}

.game-card strong {
  display: block;
  color: #ffffff;
  font-size: clamp(32px, 4vw, 52px);
  font-weight: 600;
  line-height: 1.05;
}

.game-card span:last-child {
  max-width: 260px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 15px;
  line-height: 1.5;
}

.game-card .panel-kicker {
  color: rgba(255, 255, 255, 0.82);
}

.coral-card {
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.16), transparent 42%),
    linear-gradient(145deg, var(--coral), var(--magenta));
}

.blue-card {
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.16), transparent 42%),
    linear-gradient(145deg, var(--blue), #14b4d8);
}

.magenta-card {
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.16), transparent 42%),
    linear-gradient(145deg, var(--magenta), #ff7b9d);
}

.purple-card {
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.16), transparent 42%),
    linear-gradient(145deg, var(--purple), #111111);
}

.entry-panel,
.status-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 24px;
  min-height: 300px;
  padding: 32px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-hero);
  background: var(--canvas);
  box-shadow: var(--shadow-subtle);
}

.entry-panel p,
.status-card p {
  color: var(--slate);
  font-size: 15px;
  line-height: 1.5;
}

.coral-panel {
  color: #ffffff;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.16), transparent 42%),
    linear-gradient(145deg, var(--coral), var(--magenta));
  border-color: transparent;
}

.coral-panel .panel-kicker,
.coral-panel p {
  color: rgba(255, 255, 255, 0.82);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.4;
  transition: background 160ms ease, border-color 160ms ease, color 160ms ease;
}

.button.primary {
  background: var(--ink);
  color: #ffffff;
}

.button.primary:disabled {
  background: var(--hairline);
  color: var(--steel);
}

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

.coral-panel .button.primary {
  background: #ffffff;
  color: var(--ink);
}

.coral-panel .button.secondary {
  border-color: rgba(255, 255, 255, 0.72);
  color: #ffffff;
}

.button.compact {
  min-height: 36px;
  padding: 8px 16px;
}

.ghost-hidden {
  display: none;
}

.room-controls {
  display: grid;
  gap: 14px;
}

.ai-controls {
  display: grid;
  gap: 10px;
}

.ai-panel {
  background:
    linear-gradient(135deg, rgba(47, 109, 246, 0.08), transparent 48%),
    var(--canvas);
}

.room-input-label {
  color: var(--steel);
  font-size: 13px;
  font-weight: 700;
}

.join-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
}

.text-input {
  width: 100%;
  min-height: 42px;
  padding: 10px 14px;
  border: 1px solid var(--hairline);
  border-radius: 8px;
  color: var(--ink);
  background: var(--canvas);
  outline: none;
}

.text-input:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 1px var(--blue);
}

.game-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 32px;
  align-items: start;
}

.game-main {
  display: grid;
  gap: 24px;
  min-width: 0;
}

.game-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.game-heading h1 {
  margin-bottom: 0;
  font-size: clamp(34px, 5vw, 56px);
}

.board-wrap {
  width: min(100%, 760px);
  padding: clamp(12px, 2.6vw, 24px);
  border-radius: 24px;
  background: var(--surface);
  border: 1px solid var(--hairline);
}

.board {
  display: grid;
  grid-template-columns: repeat(var(--board-size, 15), minmax(0, 1fr));
  grid-template-rows: repeat(var(--board-size, 15), minmax(0, 1fr));
  width: 100%;
  aspect-ratio: 1;
  border-radius: 16px;
  background: var(--board);
  border: 1px solid rgba(36, 24, 12, 0.2);
  overflow: hidden;
  contain: layout paint;
}

.board-cells {
  gap: 2px;
  padding: 8px;
  background: #1f7a4d;
  border-color: rgba(0, 0, 0, 0.24);
}

.point {
  position: relative;
  display: grid;
  place-items: center;
  min-width: 0;
  min-height: 0;
  padding: 0;
  border: 0;
  appearance: none;
  background: transparent;
  color: inherit;
  line-height: 0;
}

.board-intersections .point::before,
.board-intersections .point::after {
  content: "";
  position: absolute;
  background: var(--board-line);
  pointer-events: none;
}

.board-intersections .point::before {
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  transform: translateY(-50%);
}

.board-intersections .point::after {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  transform: translateX(-50%);
}

.board-cells .point {
  border-radius: 6px;
  background: #2a9961;
}

.point.star .star-dot {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 18%;
  height: 18%;
  border-radius: 50%;
  background: rgba(30, 20, 10, 0.5);
  transform: translate(-50%, -50%);
}

.stone {
  position: absolute;
  inset: 11%;
  z-index: 2;
  border-radius: 50%;
  box-shadow: 0 7px 14px rgba(0, 0, 0, 0.18);
}

.stone.black {
  background: radial-gradient(circle at 34% 28%, #575757, #050505 58%, #000000);
}

.stone.white {
  background: radial-gradient(circle at 32% 26%, #ffffff, #f1f1ed 58%, #d8d8d2);
  border: 1px solid rgba(0, 0, 0, 0.12);
}

.stone.reversi-flip {
  animation: reversi-flip 520ms cubic-bezier(0.2, 0.7, 0.2, 1);
  transform-origin: 50% 50%;
  will-change: transform, box-shadow;
}

.stone.win {
  outline: 3px solid var(--coral);
  outline-offset: 2px;
}

.stone.last::after {
  content: "";
  position: absolute;
  inset: 18%;
  border-radius: 50%;
  border: 2px solid var(--coral);
}

.stone.white.last::after {
  border-color: var(--ink);
}

.stone.pending-stone {
  opacity: 0.72;
  outline: 2px solid rgba(255, 103, 77, 0.86);
  outline-offset: 2px;
}

.point.legal:hover {
  background: rgba(255, 255, 255, 0.22);
}

@keyframes reversi-flip {
  0% {
    transform: perspective(420px) rotateY(180deg) scale(1);
    box-shadow: 0 7px 14px rgba(0, 0, 0, 0.18);
  }

  48% {
    transform: perspective(420px) rotateY(92deg) scale(1.04);
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.28);
  }

  100% {
    transform: perspective(420px) rotateY(0deg) scale(1);
    box-shadow: 0 7px 14px rgba(0, 0, 0, 0.18);
  }
}

.board-cells .point.legal::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 28%;
  height: 28%;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.46);
  transform: translate(-50%, -50%);
}

.status-panel {
  position: sticky;
  top: 88px;
  display: grid;
  gap: 18px;
}

.status-card {
  min-height: 0;
  border-radius: var(--radius-card);
  padding: 24px;
}

.status-card h2 {
  margin-bottom: 8px;
}

.status-card p {
  margin-bottom: 0;
}

.meta-list {
  display: grid;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-card);
  overflow: hidden;
  background: var(--canvas);
}

.meta-list div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
  border-bottom: 1px solid var(--hairline-soft);
}

.meta-list div:last-child {
  border-bottom: 0;
}

.meta-list span {
  color: var(--steel);
  font-size: 13px;
  font-weight: 600;
}

.meta-list strong {
  color: var(--ink);
  font-size: 15px;
  font-weight: 700;
  text-align: right;
}

.action-stack {
  display: grid;
  gap: 10px;
}

.hidden {
  display: none !important;
}

.toast {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 30;
  max-width: min(420px, calc(100vw - 48px));
  padding: 14px 18px;
  border-radius: 14px;
  background: var(--ink);
  color: #ffffff;
  font-size: 14px;
  line-height: 1.45;
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.16);
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
  transition: opacity 160ms ease, transform 160ms ease;
}

.toast.visible {
  opacity: 1;
  transform: translateY(0);
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(10, 10, 10, 0.36);
}

.modal {
  width: min(420px, 100%);
  padding: 24px;
  border-radius: var(--radius-card);
  background: var(--canvas);
  border: 1px solid var(--hairline);
  box-shadow: 0 12px 16px -4px rgba(36, 36, 36, 0.08);
}

.modal h2 {
  margin-bottom: 10px;
}

.modal p {
  color: var(--slate);
  font-size: 15px;
  line-height: 1.5;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 24px;
}

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

  .view-enter,
  .view-exit,
  .view-enter .hero-copy,
  .view-enter .game-card,
  .view-enter .entry-panel,
  .view-enter .game-main,
  .view-enter .status-panel {
    animation: none !important;
    filter: none !important;
    transform: none !important;
  }
}

@media (max-width: 1023px) {
  .app-shell {
    padding: 48px 0;
  }

  .entry-grid,
  .game-layout {
    grid-template-columns: 1fr;
  }

  .game-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .status-panel {
    position: static;
  }

  .board-wrap {
    width: min(100%, 720px);
    margin: 0 auto;
  }
}

@media (max-width: 640px) {
  .topbar {
    min-height: 58px;
    padding: 0 18px;
  }

  .app-shell {
    width: min(100vw - 28px, 1280px);
    padding: 34px 0;
  }

  h1 {
    font-size: 40px;
  }

  .lead {
    font-size: 16px;
  }

  .entry-panel,
  .game-card {
    min-height: 260px;
    padding: 24px;
    border-radius: 24px;
  }

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

  .join-row,
  .game-heading {
    grid-template-columns: 1fr;
  }

  .join-row {
    display: grid;
  }

  .game-heading {
    display: grid;
  }

  .button,
  .text-input {
    min-height: 44px;
  }

  .modal-actions {
    display: grid;
  }

  .board-wrap {
    padding: 10px;
    border-radius: 18px;
  }

  .board {
    border-radius: 12px;
  }

  .stone {
    inset: 13%;
  }
}