/* ============================================================
   Base reset & custom properties
   ============================================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg: #0d1410;
  --color-surface: #111d16;
  --color-surface-alt: #0e1913;
  --color-border: #1e3828;
  --color-primary: #3ea86c;
  --color-primary-hover: #52c47e;
  --color-accent: #e94560;
  --color-text: #ececec;
  --color-text-muted: #7a9e87;
  --color-success: #3ecf8e;
  --color-error: #e94560;
  --radius: 0.5rem;
  --radius-lg: 1rem;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --color-on-primary: #fff;
  --color-overlay-scrim: rgba(0, 0, 0, 0.7);
  --color-card-face-bg: #f0ede8;
  --color-card-face-border: #bbb;
  --gradient-card-back: linear-gradient(
    135deg,
    var(--color-surface) 0%,
    var(--color-border) 50%,
    var(--color-surface) 100%
  );
  --touch-min: 2.75rem; /* 44px */
  --transition: 0.2s ease;
}

html,
body {
  height: 100%;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 1rem;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
}

/* ============================================================
   Utility
   ============================================================ */
/* !important so this beats higher-specificity rules (ID selectors,
   .modal-overlay) that set display: flex. */
.hidden {
  display: none !important;
}

/* ============================================================
   Screens
   ============================================================ */
.screen {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

/* ============================================================
   Card
   ============================================================ */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  width: 100%;
  max-width: 28rem;
  box-shadow: var(--shadow);
}

/* ============================================================
   Typography
   ============================================================ */
h1 {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-primary-hover);
  letter-spacing: -0.02em;
  text-align: center;
}

h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.subtitle {
  text-align: center;
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  min-height: var(--touch-min);
  padding: 0 1.25rem;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), opacity var(--transition);
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-on-primary);
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-hover);
}

.btn-secondary,
.btn--secondary {
  background: var(--color-surface-alt);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover:not(:disabled),
.btn--secondary:hover:not(:disabled) {
  border-color: var(--color-primary);
  color: var(--color-primary-hover);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}

.btn-ghost:hover:not(:disabled) {
  color: var(--color-text);
  border-color: var(--color-text-muted);
}

.btn-accent {
  background: var(--color-accent);
  color: var(--color-on-primary);
}

.btn-accent:hover:not(:disabled) {
  filter: brightness(1.1);
}

.btn-sm {
  min-height: 2rem;
  padding: 0 0.75rem;
  font-size: 0.85rem;
}

/* ============================================================
   Form elements
   ============================================================ */
label {
  display: block;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 0.4rem;
}

input[type="text"] {
  width: 100%;
  min-height: var(--touch-min);
  padding: 0 0.875rem;
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  font-size: 1rem;
  transition: border-color var(--transition);
}

input[type="text"]:focus {
  outline: none;
  border-color: var(--color-primary);
}

input[type="text"]::placeholder {
  color: var(--color-text-muted);
  opacity: 0.7;
}

/* ============================================================
   Nickname form
   ============================================================ */
#nickname-form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

#nickname-form .btn {
  width: 100%;
  margin-top: 0.25rem;
}

/* ============================================================
   Lobby layout
   ============================================================ */
#lobby-screen {
  min-height: 26rem;
  justify-content: flex-start;
  padding-top: 2rem;
}

.lobby-header {
  width: 100%;
  max-width: 42rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
  flex-shrink: 0;
}

/* The welcome greeting is longer in Russian; let it wrap/yield instead of
   shoving the action icons (language/rules/logout) off the row (FR-013). */
.lobby-header h2 {
  min-width: 0;
  overflow-wrap: anywhere;
}

.lobby-header-actions {
  display: flex;
  gap: 0.25rem;
  flex-shrink: 0;
}

.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--touch-min);
  height: var(--touch-min);
  border: none;
  border-radius: var(--radius);
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}

.icon-btn:hover {
  background: var(--color-surface);
  color: var(--color-text);
}

/* Language toggle (feature 013): an .icon-btn that shows the TARGET
   language's flag (gfx/en.gif / gfx/ru.gif) instead of an SVG glyph. The
   16×11 GIFs stay at native size for crispness inside the touch target;
   the outline keeps the flag's white edges visible on light hover. */
.lang-btn img {
  display: block;
  width: 16px;
  height: 11px;
  border-radius: 2px;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.35);
}

/* Nickname screen carries a single absolutely-positioned rules icon top-right.
   #nickname-screen is a .screen (flex-centred); make it the positioning context. */
#nickname-screen {
  position: relative;
}

.nickname-rules-btn {
  position: absolute;
  top: 1rem;
  right: 1rem;
}

/* Language toggle sits left of the rules icon, mirroring the lobby header. */
.nickname-lang-btn {
  position: absolute;
  top: 1rem;
  right: calc(1rem + var(--touch-min));
}

/* Rules modal: keep the long content readable on short viewports.
   Double class to beat the later `.modal-card` max-width in the cascade. */
.modal-card.rules-card {
  max-width: 41.6rem;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
}

.rules-body {
  overflow-y: auto;
  margin: 0.5rem 0 1rem;
}

.rules-body h3 {
  margin: 1rem 0 0.25rem;
  color: var(--color-primary-hover);
  font-size: 0.95rem;
}

.rules-body p {
  margin: 0.25rem 0;
  color: var(--color-text-muted);
  line-height: 1.45;
}

.rules-body ul {
  margin: 0.25rem 0;
  padding-left: 1.25rem;
  color: var(--color-text-muted);
}

.lobby-actions {
  width: 100%;
  max-width: 42rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1rem;
  flex-shrink: 0;
  padding-bottom: 1.5rem;
}

#join-selected-btn,
#new-game-btn {
  width: 100%;
}

.join-invite-row {
  display: flex;
  gap: 0.5rem;
  flex: 1;
  min-width: 0;
}

.join-invite-row input {
  flex: 1;
  min-width: 0;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* ============================================================
   Game list
   ============================================================ */
.game-list-section {
  display: flex;
  flex-direction: column;
}

#game-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  min-height: calc(3 * 3.125rem + 2 * 0.5rem);  /* 3 rows */
  max-height: calc(10 * 3.125rem + 9 * 0.5rem); /* 10 rows, then scroll */
  overflow-y: auto;
}

#game-list li {
  display: grid;
  grid-template-columns: 6.5rem 1fr auto auto;
  align-items: center;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  gap: 0.75rem 1.25rem;
  cursor: pointer;
  transition: border-color var(--transition);
}

#game-list li:hover {
  border-color: var(--color-primary);
}

#game-list li.selected {
  border-color: var(--color-primary);
  background: var(--color-surface-alt);
}


.game-id-label {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  font-family: monospace;
}

.game-owner {
  font-size: 0.85rem;
  color: var(--color-text);
  font-weight: 500;
}

.game-player-count {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  cursor: default;
}

.player-tooltip {
  position: fixed;
  z-index: 100;
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0.4rem 0.65rem;
  font-size: 0.8rem;
  color: var(--color-text);
  white-space: pre;
  pointer-events: none;
  box-shadow: var(--shadow);
}

.game-waiting-time {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  font-family: monospace;
  white-space: nowrap;
  flex-shrink: 0;
}

.empty-state {
  color: var(--color-text-muted);
  text-align: center;
  padding: 2rem 1rem;
  font-size: 0.95rem;
}

/* ============================================================
   Waiting room / game screen
   ============================================================ */
#game-screen {
  justify-content: center;
}


.game-id {
  font-family: monospace;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  margin-bottom: 1rem;
}

.invite-display {
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem;
  margin-bottom: 1rem;
}

.invite-display p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.invite-code-box {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.invite-code {
  font-family: monospace;
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--color-success);
}

.player-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.player-list li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  background: var(--color-surface-alt);
  border-radius: var(--radius);
  font-size: 0.95rem;
}

/* FR-012/FR-013: clear computer-opponent badge so a bot is never mistaken for a human. */
.bot-badge {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 0.1rem 0.4rem;
  border-radius: var(--radius);
  background: var(--color-accent);
  color: #fff;
}

#add-bot-btn {
  display: block;
  /* Finger-sized touch target (constitution §VI). */
  min-height: var(--touch-min);
  margin: 0 auto 0.5rem;
}

/* Host-only per-bot Remove control, pushed to the trailing edge of the seat row. */
.remove-bot-btn {
  margin-left: auto;
  min-height: var(--touch-min);
}

.waiting-hint {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  text-align: center;
}

.waiting-elapsed {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  text-align: center;
  font-family: monospace;
}

#leave-game-btn {
  display: block;
  margin: 1.25rem auto 0;
}

.modal-body-text {
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
}

/* ============================================================
   New Game modal
   ============================================================ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--color-overlay-scrim);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  z-index: 100;
}

.modal-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  width: 100%;
  max-width: 26rem;
  box-shadow: var(--shadow);
}

.modal-card h2 {
  margin-bottom: 1.25rem;
}

fieldset {
  border: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-bottom: 1.5rem;
}

fieldset legend {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.radio-label {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: 0.95rem;
  cursor: pointer;
  color: var(--color-text);
  min-height: var(--touch-min);
  padding: 0.5rem 0;
}

.radio-label input[type="radio"] {
  width: 1.1rem;
  height: 1.1rem;
  accent-color: var(--color-primary);
  margin-top: 0.15rem;
  flex-shrink: 0;
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1.5rem;
}

.form-row label {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.form-row select {
  width: 100%;
  min-height: var(--touch-min);
  padding: 0 0.875rem;
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  font-size: 1rem;
  transition: border-color var(--transition);
  appearance: none;
  cursor: pointer;
}

.form-row select:focus {
  outline: none;
  border-color: var(--color-primary);
}

.modal-actions {
  display: flex;
  gap: 0.75rem;
}

.modal-actions .btn {
  flex: 1;
}

/* ============================================================
   Reconnect overlay
   ============================================================ */
#reconnect-overlay {
  position: fixed;
  inset: 0;
  background: rgba(13, 20, 16, 0.88);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 300;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
}

/* ============================================================
   Error toast  (T043 / T045)
   ============================================================ */
.toast {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-error);
  color: var(--color-on-primary);
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  box-shadow: var(--shadow);
  z-index: 200;
  max-width: calc(100vw - 2rem);
  text-align: center;
  /* Accessible contrast — error red on white text is > 4.5:1 */
}

/* ============================================================
   Responsive breakpoints  (mobile-first)
   ============================================================ */

/* 480px — small phones */
@media (max-width: 480px) {
  h1 { font-size: 2rem; }

  .modal-actions {
    flex-direction: column;
  }

  .invite-code {
    font-size: 1.4rem;
  }
}

/* 768px — tablets */
@media (max-width: 768px) {
  .card {
    padding: 1.5rem 1rem;
  }

  .modal-card {
    padding: 1.5rem 1rem;
  }

  #game-list li {
    flex-direction: column;
    align-items: flex-start;
  }

  #game-list li .btn {
    width: 100%;
  }
}