/**
 * Memory Move — calm, warm, premium demo UI
 */

*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --bg: #f4ead8;
  --bg-deep: #e8dcc4;
  --ink: #2c2418;
  --muted: #6b5e4d;
  --accent: #8b5a2b;
  --accent-soft: #a67c52;
  --card: #fffdf8;
  --card-border: #d4c4a8;
  --board-light: #f0d9b5;
  --board-dark: #b58863;
  --success: #3d6b4f;
  --warn: #8b4513;
  --serif: "Georgia", "Times New Roman", serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --radius: 12px;
  --shadow: 0 8px 32px rgba(44, 36, 24, 0.08);
}

html {
  font-size: 18px;
  -webkit-font-smoothing: antialiased;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg);
  background-image: linear-gradient(180deg, var(--bg) 0%, var(--bg-deep) 100%);
  line-height: 1.5;
}

/*
 * chessboard.js positions pieces with CSS transforms — never override transform
 * on pieces (no hover lift, no scaling) — keeps drag smooth.
 */
#board .piece-417db,
#board img {
  transition: none !important;
}

#board .piece-417db {
  filter: drop-shadow(1px 2px 2px rgba(0, 0, 0, 0.28));
}

/* 3D-style board frame + wood-like squares (lighting on container so pieces stay on top) */
#board-container {
  max-width: 480px;
  width: 100%;
  margin: 0 auto;
  perspective: 1000px;
  border-radius: 12px;
  overflow: hidden;
  box-shadow:
    0 8px 24px rgba(0, 0, 0, 0.15),
    inset 0 2px 4px rgba(255, 255, 255, 0.35),
    inset 0 0 22px rgba(0, 0, 0, 0.14);
}

#board {
  position: relative;
  margin: 0 auto;
  width: 100%;
  height: 100%;
  border-radius: 12px;
  overflow: hidden;
}

#board .board-b72b1 .white-1e1d7,
#board .white-1e1d7 {
  background: linear-gradient(145deg, #f3d9b5, #e2c29c) !important;
}

#board .board-b72b1 .black-3c85d,
#board .black-3c85d {
  background: linear-gradient(145deg, #b58863, #9c6f4a) !important;
}

.app {
  max-width: 520px;
  margin: 0 auto;
  min-height: 100vh;
  padding: 24px 20px 48px;
  display: flex;
  flex-direction: column;
}

/* --- Welcome --- */
.screen {
  display: none;
  flex: 1;
  flex-direction: column;
  justify-content: center;
  gap: 24px;
}

.screen.is-active {
  display: flex;
}

.brand {
  text-align: center;
}

.brand h1 {
  font-family: var(--serif);
  font-size: 2.25rem;
  font-weight: 600;
  margin: 0 0 8px;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.brand p.sub {
  margin: 0;
  font-size: 1.1rem;
  color: var(--muted);
  font-style: italic;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field label {
  font-size: 0.85rem;
  color: var(--muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.field input[type="text"] {
  width: 100%;
  padding: 16px 18px;
  font-size: 1.15rem;
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  background: var(--card);
  color: var(--ink);
  font-family: var(--sans);
}

.field input:focus {
  outline: 2px solid var(--accent-soft);
  outline-offset: 2px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 16px 20px;
  font-size: 1.05rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  font-family: var(--sans);
  background: var(--accent);
  color: #fffef8;
  box-shadow: var(--shadow);
}

.btn:hover {
  background: #7a4d24;
}

.btn:active {
  transform: translateY(1px);
}

.btn.is-loading {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  cursor: wait;
  opacity: 0.92;
}

.btn.is-loading::before {
  content: '';
  width: 1.1em;
  height: 1.1em;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: btn-spin 0.65s linear infinite;
  flex-shrink: 0;
}

@keyframes btn-spin {
  to {
    transform: rotate(360deg);
  }
}

.btn-secondary {
  background: transparent;
  color: var(--accent);
  border: 2px solid var(--accent-soft);
  box-shadow: none;
}

.btn-secondary:hover {
  background: rgba(139, 90, 43, 0.08);
}

/* --- Game screen --- */
.game-header {
  text-align: center;
  margin-bottom: 12px;
}

.game-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.game-header-side {
  flex: 1;
  min-width: 0;
}

a.game-header-side.progress-nav-link {
  text-align: right;
}

.progress-nav-link {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
  padding: 6px 4px;
  border-radius: 8px;
}

.progress-nav-link:hover {
  background: rgba(139, 90, 43, 0.08);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.game-header .app-name {
  flex: 0 1 auto;
  font-family: var(--serif);
  font-size: 1rem;
  color: var(--muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-align: center;
}

.game-header .hello {
  margin: 6px 0 0;
  font-size: 1.25rem;
  font-family: var(--serif);
}

.difficulty-row {
  display: flex;
  justify-content: center;
  margin-bottom: 16px;
}

.difficulty-pill {
  padding: 8px 20px;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 999px;
  border: 1px solid var(--card-border);
  background: var(--card);
  color: var(--ink);
  cursor: pointer;
  font-family: var(--sans);
}

.difficulty-pill:focus {
  outline: 2px solid var(--accent-soft);
}

.board-wrap {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 12px;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
  flex-shrink: 0;
  width: 100%;
  max-width: 100%;
  overflow: hidden;
}

.welcome-actions {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 8px;
}

.header-settings-btn {
  font: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
  background: rgba(255, 253, 248, 0.6);
  border: 1px solid var(--card-border);
  border-radius: 10px;
  padding: 10px 14px;
  cursor: pointer;
  box-shadow: var(--shadow);
}

.header-settings-btn:hover {
  background: var(--card);
}

.game-header-actions {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 6px;
}

@media (min-width: 380px) {
  .game-header-actions {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: flex-end;
    align-items: center;
  }
}

.companion-card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 20px 22px;
  min-height: 5.5rem;
  box-shadow: var(--shadow);
}

.companion-card p {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.2rem;
  line-height: 1.65;
  font-style: italic;
  color: var(--ink);
}

.companion-card.loading {
  opacity: 0.55;
}

.status-line {
  text-align: center;
  margin-top: 14px;
  font-size: 0.95rem;
  color: var(--muted);
}

.status-line.status-turn {
  color: var(--success);
  font-weight: 600;
}

.status-line.status-wait {
  color: var(--muted);
}

.status-line.status-over {
  color: var(--warn);
  font-weight: 600;
}

.session-panel {
  margin-top: 20px;
  padding: 16px 18px;
  background: rgba(255, 253, 248, 0.85);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.session-panel-title {
  margin: 0 0 12px;
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink);
}

.session-panel-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 14px;
}

.session-stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.session-stat-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.session-stat-value {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--accent);
}

.session-panel-history {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid rgba(212, 196, 168, 0.6);
}

.session-history-title {
  margin: 0 0 8px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
}

.session-history-list {
  margin: 0;
  padding-left: 1.1rem;
  font-size: 0.88rem;
  line-height: 1.45;
  color: var(--ink);
}

.session-history-list li {
  margin-bottom: 4px;
}

.session-history-empty {
  list-style: none;
  margin-left: -1.1rem;
  color: var(--muted);
  font-style: italic;
}

.game-actions {
  margin-top: 28px;
}

/* --- Modals --- */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(44, 36, 24, 0.45);
  z-index: 100;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-overlay.visible {
  display: flex;
}

.modal {
  background: var(--card);
  border-radius: var(--radius);
  padding: 28px 24px;
  max-width: 420px;
  width: 100%;
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.15);
  border: 1px solid var(--card-border);
}

.modal h2 {
  font-family: var(--serif);
  font-size: 1.5rem;
  margin: 0 0 12px;
  text-align: center;
}

.modal p {
  margin: 0 0 20px;
  text-align: center;
  color: var(--muted);
  font-size: 1rem;
}

.modal-settings {
  max-width: 440px;
  text-align: left;
}

.modal-settings h2 {
  text-align: center;
}

.settings-intro {
  margin: 0 0 20px !important;
  font-size: 0.95rem !important;
  line-height: 1.5 !important;
}

.settings-field {
  margin-bottom: 18px;
}

.settings-field label {
  display: block;
  font-size: 0.82rem;
  color: var(--muted);
  letter-spacing: 0.03em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.settings-field input[type='text'],
.settings-field select {
  width: 100%;
  padding: 18px 16px;
  font-size: 1.05rem;
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  background: #fffdf8;
  color: var(--ink);
  font-family: var(--sans);
}

.settings-field select {
  cursor: pointer;
}

.settings-field input:focus,
.settings-field select:focus {
  outline: 2px solid var(--accent-soft);
  outline-offset: 2px;
}

.settings-hint {
  margin: 8px 0 0 !important;
  font-size: 0.88rem !important;
  color: var(--warn) !important;
  text-align: left !important;
}

.settings-checkbox-wrap {
  margin-bottom: 8px;
}

.settings-checkbox-label {
  display: flex !important;
  align-items: flex-start;
  gap: 12px;
  font-size: 1.05rem !important;
  color: var(--ink) !important;
  text-transform: none !important;
  letter-spacing: normal !important;
  cursor: pointer;
  line-height: 1.45 !important;
}

.settings-checkbox-label input {
  width: 1.15rem;
  height: 1.15rem;
  margin-top: 4px;
  flex-shrink: 0;
  cursor: pointer;
}

.modal-actions-row {
  flex-direction: row !important;
  gap: 12px !important;
}

.modal-actions-row .btn {
  flex: 1;
  width: auto;
}

.modal-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.report-body {
  max-height: 280px;
  overflow-y: auto;
  text-align: left;
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--ink);
  margin-bottom: 16px;
  white-space: pre-wrap;
}

/* Session modal: loading row (prompt-style + spinner) */
.session-loading-row {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 4px 0 8px;
}

.session-spinner {
  width: 22px;
  height: 22px;
  border: 2px solid var(--card-border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: btn-spin 0.75s linear infinite;
  flex-shrink: 0;
  margin-top: 2px;
}

.session-prompt-msg {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.45;
  color: var(--muted);
  font-family: ui-monospace, 'Cascadia Code', 'Consolas', monospace;
  border-left: 3px solid var(--accent-soft);
  padding-left: 12px;
}

.modal-session[aria-busy='true'] .modal-actions .btn {
  opacity: 0.65;
  pointer-events: none;
}

.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.badge-sent {
  background: #e8f5e9;
  color: #2e7d32;
}

.badge-not-sent {
  background: #fff3e0;
  color: #e65100;
}

.badge-sending {
  background: #ede7dc;
  color: var(--muted);
  font-style: italic;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

@media (min-width: 600px) {
  .app {
    max-width: 560px;
  }
}