*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --cyan: #00eeff;
  --cyan-dim: #0099aa;
  --cyan-dark: #003340;
  --cyan-glow: rgba(0, 238, 255, 0.12);
  --bg: #0a0a0a;
  --red: #ff4455;
  --green: #00ff88;
  --yellow: #ffcc44;
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--cyan);
  font-family: 'Share Tech Mono', monospace;
  overscroll-behavior: none;
  -webkit-tap-highlight-color: transparent;
}

.scanlines {
  position: fixed; inset: 0;
  background: repeating-linear-gradient(0deg, rgba(0,0,0,.1) 0px, rgba(0,0,0,.1) 1px, transparent 1px, transparent 3px);
  pointer-events: none; z-index: 100;
}
.vignette {
  position: fixed; inset: 0;
  background: radial-gradient(ellipse at center, transparent 55%, rgba(0,0,0,.75) 100%);
  pointer-events: none; z-index: 99;
}

#app {
  position: relative; z-index: 1;
  min-height: 100vh;
}

/* ═══════════════════════════════════════════════════════════════════════════
   SCREENS
   ═══════════════════════════════════════════════════════════════════════════ */
.screen {
  display: none;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  padding: 20px 16px 40px;
  max-width: 500px;
  margin: 0 auto;
}
.screen.active { display: flex; }

/* ── Back link (menu → site) ─────────────────────────────────────────────── */
.back-link {
  align-self: flex-start;
  font-size: 0.62rem; color: var(--cyan-dim);
  text-decoration: none; letter-spacing: 0.05em;
  margin-bottom: 4px; transition: color 0.15s;
}
.back-link:hover { color: var(--cyan); }

/* ── Nav back button (between screens) ──────────────────────────────────── */
.nav-back {
  background: transparent; border: none;
  color: var(--cyan-dim); font-family: 'Share Tech Mono', monospace;
  font-size: 0.7rem; cursor: pointer; padding: 2px 0;
  letter-spacing: 0.05em; transition: color 0.15s;
}
.nav-back:hover { color: var(--cyan); }

/* ═══════════════════════════════════════════════════════════════════════════
   NAME SCREEN
   ═══════════════════════════════════════════════════════════════════════════ */
#screen-name {
  justify-content: center;
  min-height: 100vh;
}
.name-screen-inner {
  display: flex; flex-direction: column; align-items: center;
  width: 100%; max-width: 340px; gap: 0;
}
.name-screen-card {
  width: 100%;
  display: flex; flex-direction: column; gap: 12px;
  background: #0c0c0c;
  border: 2px solid var(--cyan);
  border-radius: 10px;
  padding: 24px 20px;
  box-shadow: 0 0 28px rgba(0,238,255,.18);
}

/* ═══════════════════════════════════════════════════════════════════════════
   MAIN MENU SCREEN
   ═══════════════════════════════════════════════════════════════════════════ */
.logo-wrap {
  text-align: center;
  margin: 28px 0 36px;
}
.logo {
  font-family: 'Press Start 2P', monospace;
  font-size: clamp(1.1rem, 5vw, 1.8rem);
  color: var(--cyan);
  text-shadow: 0 0 10px var(--cyan), 0 0 30px rgba(0,238,255,.4), 0 0 60px rgba(0,238,255,.15);
  letter-spacing: 0.25em;
  animation: flicker 9s infinite;
}
@keyframes flicker { 0%,93%,100%{opacity:1} 94%{opacity:.65} 96%{opacity:1} 98%{opacity:.82} }
.tagline {
  margin-top: 10px;
  font-size: 0.7rem; color: var(--cyan-dim); letter-spacing: 0.15em;
}

.menu-cards {
  display: flex; gap: 14px;
  width: 100%; justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 28px;
}
.menu-card {
  flex: 1; min-width: 140px; max-width: 200px;
  background: transparent;
  border: 2px solid var(--cyan-dark);
  border-radius: 10px;
  padding: 24px 16px 20px;
  cursor: pointer; text-align: center;
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  transition: all 0.18s; color: var(--cyan);
}
.menu-card:hover {
  border-color: var(--cyan);
  box-shadow: 0 0 20px rgba(0,238,255,.2), inset 0 0 20px rgba(0,238,255,.04);
  transform: translateY(-3px);
}
.mcard-icon  { font-size: 2.4rem; line-height: 1; }
.mcard-title {
  font-family: 'Press Start 2P', monospace;
  font-size: 0.6rem; letter-spacing: 0.1em; color: var(--cyan);
}
.mcard-desc  { font-size: 0.62rem; color: var(--cyan-dim); line-height: 1.5; }

/* ═══════════════════════════════════════════════════════════════════════════
   CONFIG SCREENS (DAILY + PRACTICE)
   ═══════════════════════════════════════════════════════════════════════════ */
.screen-header {
  width: 100%; display: flex;
  align-items: center; justify-content: space-between;
  margin-bottom: 24px;
}
.screen-title {
  font-family: 'Press Start 2P', monospace;
  font-size: 0.7rem; color: var(--cyan);
  text-shadow: 0 0 8px rgba(0,238,255,.5);
  letter-spacing: 0.1em;
}

/* Date block */
.config-date-block {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  margin-bottom: 28px;
  padding: 14px 24px;
  border: 1px solid var(--cyan-dark); border-radius: 6px;
  width: 100%; text-align: center;
  background: rgba(0,238,255,.03);
}
.config-day-label { font-size: 0.55rem; color: var(--cyan-dim); letter-spacing: 0.15em; }
.config-date-value {
  font-family: 'Press Start 2P', monospace;
  font-size: 0.65rem; color: var(--cyan);
  letter-spacing: 0.08em;
}

/* Config sections */
.config-section { width: 100%; margin-bottom: 24px; }
.config-label {
  display: block;
  font-family: 'Press Start 2P', monospace;
  font-size: 0.42rem; color: var(--cyan-dim);
  letter-spacing: 0.15em; margin-bottom: 10px;
}

/* Size picker */
.size-picker { display: flex; gap: 10px; }
.size-opt {
  flex: 1;
  background: transparent;
  border: 2px solid var(--cyan-dark);
  border-radius: 7px; padding: 14px 12px;
  cursor: pointer; text-align: center;
  display: flex; flex-direction: column; gap: 5px;
  transition: all 0.15s; color: var(--cyan-dim);
}
.size-opt:hover   { border-color: var(--cyan-dim); color: var(--cyan); }
.size-opt.active  {
  border-color: var(--cyan); color: var(--cyan);
  background: var(--cyan-glow);
  box-shadow: 0 0 12px rgba(0,238,255,.15);
}
.size-num {
  font-family: 'Press Start 2P', monospace;
  font-size: 0.8rem; letter-spacing: 0.05em;
}
.size-sub { font-size: 0.6rem; color: inherit; opacity: 0.75; }

/* Difficulty picker */
.diff-picker { display: flex; flex-direction: column; gap: 8px; }
.diff-opt {
  width: 100%;
  background: transparent;
  border: 2px solid var(--cyan-dark);
  border-radius: 7px; padding: 13px 16px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: space-between;
  transition: all 0.15s; color: var(--cyan-dim);
}
.diff-opt:hover  { border-color: var(--cyan-dim); color: var(--cyan); }
.diff-opt.active {
  border-color: var(--cyan); color: var(--cyan);
  background: var(--cyan-glow);
  box-shadow: 0 0 12px rgba(0,238,255,.12);
}
.diff-name {
  font-family: 'Press Start 2P', monospace;
  font-size: 0.5rem; letter-spacing: 0.08em;
}
.diff-sub { font-size: 0.62rem; color: inherit; opacity: 0.7; }

/* Status block (daily completion) */
.status-block { width: 100%; margin-bottom: 20px; }
.done-badge {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 16px;
  border: 1px solid var(--green);
  border-radius: 6px;
  background: rgba(0,255,136,.07);
  font-size: 0.7rem; color: var(--green);
  letter-spacing: 0.05em;
}
.done-badge .done-time {
  font-family: 'Press Start 2P', monospace;
  font-size: 0.6rem;
}

/* Config name input */
.config-name-input {
  width: 100%;
  background: #0f0f0f;
  border: 2px solid var(--cyan-dark);
  color: var(--cyan);
  padding: 11px 14px;
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.9rem;
  border-radius: 6px;
  outline: none;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  transition: border-color 0.15s;
}
.config-name-input:focus { border-color: var(--cyan); box-shadow: 0 0 8px rgba(0,238,255,.15); }
.config-name-input::placeholder { color: var(--cyan-dark); font-size: 0.75rem; letter-spacing: 0.1em; }
.config-name-input.input-error { border-color: var(--red); animation: shake 0.3s ease; }
@keyframes shake {
  0%,100%{transform:translateX(0)} 25%{transform:translateX(-6px)} 75%{transform:translateX(6px)}
}

/* Blocked daily state */
.daily-done-block {
  width: 100%;
  border: 1px solid var(--green);
  border-radius: 8px;
  background: rgba(0,255,136,.05);
  padding: 16px;
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  text-align: center;
  margin-bottom: 4px;
}
.done-check  { font-size: 1.6rem; color: var(--green); text-shadow: 0 0 12px var(--green); }
.done-title  { font-family: 'Press Start 2P', monospace; font-size: 0.55rem; color: var(--green); letter-spacing: 0.1em; }
.done-time-val { font-family: 'Press Start 2P', monospace; font-size: 0.85rem; color: var(--green); text-shadow: 0 0 10px var(--green); }
.done-next   { font-size: 0.62rem; color: var(--cyan-dim); margin-top: 2px; }

/* Size opt done indicator */
.size-opt .done-dot {
  display: inline-block; width: 7px; height: 7px;
  border-radius: 50%; background: var(--green);
  box-shadow: 0 0 5px var(--green);
  margin-left: 4px; vertical-align: middle;
}

/* Win save status */
.win-save-status { font-size: 0.65rem; color: var(--cyan-dim); min-height: 18px; }
.win-save-status.saved { color: var(--green); }

/* Start button */
.start-btn {
  width: 100%;
  background: var(--cyan-glow);
  border: 2px solid var(--cyan);
  color: var(--cyan);
  font-family: 'Press Start 2P', monospace;
  font-size: 0.65rem; letter-spacing: 0.15em;
  padding: 16px;
  border-radius: 7px; cursor: pointer;
  margin-bottom: 14px;
  transition: all 0.15s;
  text-shadow: 0 0 6px rgba(0,238,255,.5);
  box-shadow: 0 0 14px rgba(0,238,255,.15);
}
.start-btn:hover {
  background: rgba(0,238,255,.2);
  box-shadow: 0 0 22px rgba(0,238,255,.3);
  transform: translateY(-1px);
}

/* Ghost button */
.ghost-btn {
  background: transparent; border: none;
  color: var(--cyan-dim); cursor: pointer;
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.72rem; letter-spacing: 0.08em;
  padding: 6px 12px; border-radius: 4px;
  transition: color 0.15s;
}
.ghost-btn:hover { color: var(--cyan); }

/* ═══════════════════════════════════════════════════════════════════════════
   GAME SCREEN
   ═══════════════════════════════════════════════════════════════════════════ */
#screen-game {
  padding-top: 10px;
  padding-bottom: 28px;
}

.game-topbar {
  width: 100%; display: flex;
  align-items: center; justify-content: space-between;
  margin-bottom: 8px; gap: 8px;
}
.game-topbar-center {
  display: flex; flex-direction: column; align-items: center; gap: 2px;
}
.game-label {
  font-size: 0.58rem; color: var(--cyan-dim); letter-spacing: 0.1em;
  text-align: center;
}
.game-timer {
  font-family: 'Press Start 2P', monospace;
  font-size: 0.9rem; color: var(--cyan);
  letter-spacing: 0.1em;
  text-shadow: 0 0 8px rgba(0,238,255,.5);
  min-width: 56px; text-align: center;
}
.ghost-btn-sm {
  background: transparent; border: 1px solid var(--cyan-dark);
  color: var(--cyan-dim); cursor: pointer;
  font-size: 1rem; padding: 5px 9px;
  border-radius: 4px; transition: all 0.12s;
}
.ghost-btn-sm:hover { border-color: var(--cyan); color: var(--cyan); }

/* Grid */
#grid-wrap {
  width: 100%; display: flex; justify-content: center;
  margin-bottom: 10px;
}
#sudoku-grid {
  display: grid;
  width: min(calc(100vw - 24px), 460px);
  aspect-ratio: 1;
  border: 2px solid var(--cyan);
  box-shadow: 0 0 20px rgba(0,238,255,.18), inset 0 0 20px rgba(0,0,0,.4);
  border-radius: 2px;
}
.cell {
  display: flex; align-items: center; justify-content: center;
  border: 1px solid rgba(0,238,255,.12);
  font-family: 'Share Tech Mono', monospace;
  font-size: clamp(13px, 3.2vw, 20px);
  cursor: pointer; user-select: none;
  position: relative; transition: background 0.07s; aspect-ratio: 1;
}
.cell.box-right  { border-right:  2px solid rgba(0,238,255,.45); }
.cell.box-bottom { border-bottom: 2px solid rgba(0,238,255,.45); }
.cell.given      { color: var(--cyan); }
.cell.filled     { color: rgba(0,238,255,.65); }
.cell.error      { color: var(--red); text-shadow: 0 0 6px rgba(255,68,85,.6); }
.cell.complete   { color: var(--green); }
.cell.highlighted { background: rgba(0,238,255,.06); }
.cell.same-num   { background: rgba(0,238,255,.14); }
.cell.selected   { background: rgba(0,238,255,.26) !important; box-shadow: inset 0 0 0 2px var(--cyan); }
.note-grid { display: grid; grid-template-columns: repeat(3,1fr); width: 88%; height: 88%; }
.note-num {
  display: flex; align-items: center; justify-content: center;
  font-size: clamp(5px,1.05vw,7.5px); color: rgba(0,238,255,.55); line-height: 1;
}

/* Numpad */
#numpad {
  display: flex; gap: 5px; width: 100%; max-width: 460px;
  margin-bottom: 8px; justify-content: center;
}
.num-btn {
  flex: 1; max-width: 46px; aspect-ratio: 1;
  font-family: 'Press Start 2P', monospace;
  font-size: clamp(11px,2.4vw,16px);
  border: 2px solid var(--cyan-dark); background: transparent; color: var(--cyan);
  cursor: pointer; border-radius: 4px; transition: all 0.1s;
  display: flex; align-items: center; justify-content: center;
}
.num-btn:hover, .num-btn:active {
  border-color: var(--cyan); background: var(--cyan-glow);
  text-shadow: 0 0 6px var(--cyan);
}
.num-btn.done-num    { opacity: 0.25; pointer-events: none; }
.num-btn.hidden-num  { display: none; }

/* Actions */
#actions { display: flex; gap: 10px; margin-bottom: 8px; }
.act-btn {
  background: transparent; border: 2px solid var(--cyan-dark);
  color: var(--cyan-dim); border-radius: 6px; padding: 8px 18px;
  cursor: pointer; text-align: center; transition: all 0.12s;
  display: flex; flex-direction: column; align-items: center; gap: 3px;
  min-width: 72px;
}
.act-icon  { font-size: 1.1rem; }
.act-label { font-family: 'Press Start 2P', monospace; font-size: 0.38rem; letter-spacing: 0.06em; }
.act-btn:hover { border-color: var(--cyan); color: var(--cyan); }
.act-btn.notes-on {
  border-color: var(--yellow); color: var(--yellow);
  background: rgba(255,204,68,.08); box-shadow: 0 0 8px rgba(255,204,68,.2);
}

.sec-btn {
  background: transparent; border: 1px solid var(--cyan-dark);
  color: var(--cyan-dim); padding: 8px 20px; border-radius: 4px;
  cursor: pointer; font-family: 'Share Tech Mono', monospace;
  font-size: 0.72rem; letter-spacing: 0.1em; transition: all 0.12s;
}
.sec-btn:hover { border-color: var(--cyan); color: var(--cyan); }

/* ═══════════════════════════════════════════════════════════════════════════
   OVERLAYS
   ═══════════════════════════════════════════════════════════════════════════ */
.overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.88);
  display: flex; align-items: center; justify-content: center;
  z-index: 200; padding: 16px;
}
.overlay.hidden { display: none !important; }

.loading-box {
  font-family: 'Press Start 2P', monospace; font-size: 0.75rem;
  color: var(--cyan); text-shadow: 0 0 12px var(--cyan);
  text-align: center; line-height: 1.8;
  animation: pulse 1.2s ease-in-out infinite;
}
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.3} }

/* Panel */
.panel {
  background: #0c0c0c; border: 2px solid var(--cyan);
  border-radius: 8px; padding: 22px 20px;
  width: 100%; max-width: 340px;
  box-shadow: 0 0 32px rgba(0,238,255,.2);
  display: flex; flex-direction: column; align-items: center; gap: 12px;
  max-height: 92vh; overflow-y: auto;
}

/* Win overlay */
.win-icon  { font-size: 2.6rem; color: var(--green); text-shadow: 0 0 20px var(--green); }
.win-title { font-family: 'Press Start 2P', monospace; font-size: 0.8rem; color: var(--cyan); }
.win-time  { font-family: 'Press Start 2P', monospace; font-size: 1.5rem; color: var(--green); text-shadow: 0 0 14px var(--green); }
.win-sub   { font-size: 0.67rem; color: var(--cyan-dim); text-align: center; }
.win-form  { display: flex; gap: 7px; width: 100%; }
.win-btns  { display: flex; gap: 8px; width: 100%; }
.win-btns .submit-btn { flex: 1; }
.win-btns .sec-btn    { flex: 1; text-align: center; }

.name-input {
  flex: 1; min-width: 0;
  background: #141414; border: 1px solid var(--cyan-dark);
  color: var(--cyan); padding: 8px 10px;
  font-family: 'Share Tech Mono', monospace; font-size: 0.8rem;
  border-radius: 4px; outline: none; text-transform: uppercase;
}
.name-input:focus { border-color: var(--cyan); }
.name-input::placeholder { color: var(--cyan-dark); text-transform: uppercase; }

.submit-btn {
  background: var(--cyan-glow); border: 1px solid var(--cyan); color: var(--cyan);
  padding: 8px 12px; font-family: 'Share Tech Mono', monospace; font-size: 0.7rem;
  cursor: pointer; border-radius: 4px; white-space: nowrap;
  letter-spacing: 0.05em; transition: all 0.12s;
}
.submit-btn:hover { background: rgba(0,238,255,.22); }
.submit-btn:disabled { opacity: 0.45; cursor: default; }

/* Rankings overlay */
.panel-title { font-family: 'Press Start 2P', monospace; font-size: 0.75rem; color: var(--cyan); text-shadow: 0 0 8px var(--cyan); }
.rank-mode-tabs { display: flex; gap: 7px; }
.rtab {
  font-family: 'Press Start 2P', monospace; font-size: 0.42rem;
  padding: 5px 11px; border: 1px solid var(--cyan-dark);
  background: transparent; color: var(--cyan-dim);
  cursor: pointer; border-radius: 3px; transition: all 0.12s;
}
.rtab.active { border-color: var(--cyan); color: var(--cyan); background: var(--cyan-glow); }
.rtab:hover:not(.active) { border-color: var(--cyan-dim); color: var(--cyan); }

.rank-size-row { display: flex; gap: 6px; }
.rsize {
  font-family: 'Press Start 2P', monospace; font-size: 0.4rem;
  padding: 4px 9px; border: 1px solid var(--cyan-dark);
  background: transparent; color: var(--cyan-dim);
  cursor: pointer; border-radius: 3px; transition: all 0.12s;
}
.rsize.active { border-color: var(--cyan); color: var(--cyan); background: var(--cyan-glow); }
.rsize:hover:not(.active) { border-color: var(--cyan-dim); color: var(--cyan); }

.rank-date-nav { display: flex; align-items: center; gap: 6px; width: 100%; justify-content: center; }
.date-nav-btn {
  background: transparent; border: 1px solid var(--cyan-dark); color: var(--cyan-dim);
  width: 28px; height: 28px; border-radius: 3px; cursor: pointer; font-size: 0.75rem;
  display: flex; align-items: center; justify-content: center; transition: all 0.12s;
}
.date-nav-btn:hover:not(:disabled) { border-color: var(--cyan); color: var(--cyan); }
.date-nav-btn:disabled { opacity: 0.25; cursor: default; }
.date-nav-lbl {
  font-family: 'Press Start 2P', monospace; font-size: 0.42rem;
  color: var(--cyan); letter-spacing: 0.06em; text-align: center; min-width: 82px;
}
.date-nav-today {
  font-family: 'Press Start 2P', monospace; font-size: 0.35rem;
  padding: 3px 6px; border: 1px solid var(--cyan-dark);
  background: transparent; color: var(--cyan-dim);
  cursor: pointer; border-radius: 3px; transition: all 0.12s; flex-shrink: 0;
}
.date-nav-today:hover { border-color: var(--cyan); color: var(--cyan); }
.date-nav-today.is-today { border-color: var(--cyan); color: var(--cyan); background: var(--cyan-glow); }

.rank-diff-row { display: flex; gap: 6px; }
.rdiff {
  font-family: 'Press Start 2P', monospace; font-size: 0.38rem;
  padding: 4px 8px; border: 1px solid var(--cyan-dark);
  background: transparent; color: var(--cyan-dim);
  cursor: pointer; border-radius: 3px; transition: all 0.12s;
}
.rdiff.active { border-color: var(--cyan); color: var(--cyan); background: var(--cyan-glow); }
.rdiff:hover:not(.active) { border-color: var(--cyan-dim); color: var(--cyan); }

.rank-list-wrap { width: 100%; }
.rank-section-label { font-size: 0.58rem; color: var(--cyan-dim); letter-spacing: 0.1em; margin-bottom: 6px; display: block; }
.rank-row {
  display: flex; align-items: center; gap: 7px;
  padding: 5px 4px; border-bottom: 1px solid rgba(0,238,255,.07); font-size: 0.73rem;
}
.rank-row:last-child { border-bottom: none; }
.rank-row.me { background: rgba(0,238,255,.06); border-radius: 3px; }
.rank-pos { font-family: 'Press Start 2P', monospace; font-size: 0.44rem; color: var(--cyan-dim); min-width: 24px; }
.rank-pos.gold   { color: #ffd700; }
.rank-pos.silver { color: #c0c0c0; }
.rank-pos.bronze { color: #cd7f32; }
.rank-name { flex: 1; color: var(--cyan); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.rank-time { font-family: 'Press Start 2P', monospace; font-size: 0.5rem; color: var(--green); white-space: nowrap; }
.no-entries { font-size: 0.68rem; color: var(--cyan-dim); padding: 20px; text-align: center; }

.hidden { display: none !important; }