/* Minecraft 像素风 */
:root {
  --grass-top:    #7cb342;
  --grass-side:   #5d943c;
  --grass-dark:   #3d6b25;
  --dirt:         #8b5a2b;
  --dirt-dark:    #5e3a18;
  --stone:        #9e9e9e;
  --stone-light:  #c4c4c4;
  --stone-dark:   #6e6e6e;
  --stone-shadow: #4a4a4a;
  --sky:          #6ec0f5;
  --sky-light:    #a8dcff;
  --wood:         #a07845;
  --wood-dark:    #6e4f2a;
  --gold:         #f8d048;
  --gold-dark:    #c89020;
  --redstone:     #c83232;
  --redstone-dark:#8a1a1a;
  --emerald:      #2eb978;
  --emerald-dark: #1a7a4a;
  --tnt:          #d44a3a;
  --tnt-dark:     #8a2515;
  --ink:          #2a1f14;
  --paper:        #f0e4c8;
  --paper-dark:   #c8b888;
  --shadow:       0 4px 0 rgba(0,0,0,0.25);
}

* {
  box-sizing: border-box;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

html, body {
  margin: 0;
  padding: 0;
  background:
    repeating-linear-gradient(0deg, transparent 0 32px, rgba(255,255,255,0.04) 32px 33px),
    repeating-linear-gradient(90deg, transparent 0 32px, rgba(0,0,0,0.04) 32px 33px),
    linear-gradient(180deg, var(--sky-light) 0%, var(--sky) 60%, var(--grass-top) 60%, var(--grass-side) 100%);
  background-attachment: fixed;
  color: var(--ink);
  font-family: "Courier New", "PingFang SC", "Microsoft YaHei", monospace;
  font-weight: 700;
  -webkit-font-smoothing: none;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: geometricPrecision;
  font-size: 15px;
  line-height: 1.5;
  letter-spacing: 0.5px;
  min-height: 100vh;
}

#app {
  max-width: 640px;
  margin: 0 auto;
  padding: 24px 16px 60px;
  min-height: 100vh;
}

.view.hidden { display: none; }

/* 像素方块边框 — 用 box-shadow 堆叠实现 */
.pixel-box {
  background: var(--paper);
  border: 4px solid var(--ink);
  box-shadow:
    inset 0 4px 0 rgba(255,255,255,0.4),
    inset 0 -4px 0 rgba(0,0,0,0.2),
    4px 4px 0 var(--ink);
}

/* Hero */
.hero {
  text-align: center;
  margin: 16px 0 24px;
  padding: 20px 16px;
  background:
    linear-gradient(180deg, var(--grass-top) 0%, var(--grass-top) 30%, var(--dirt) 30%, var(--dirt) 100%);
  border: 4px solid var(--ink);
  box-shadow:
    inset 0 -4px 0 rgba(0,0,0,0.25),
    inset 4px 0 0 rgba(255,255,255,0.15),
    inset -4px 0 0 rgba(0,0,0,0.15),
    4px 4px 0 var(--ink);
  position: relative;
}
.hero h1 {
  font-size: 26px;
  font-weight: 700;
  margin: 0 0 6px;
  letter-spacing: 2px;
  color: #fff;
  text-shadow:
    2px 0 0 var(--ink),
    -2px 0 0 var(--ink),
    0 2px 0 var(--ink),
    0 -2px 0 var(--ink),
    2px 2px 0 var(--ink),
    -2px 2px 0 var(--ink),
    3px 3px 0 rgba(0,0,0,0.4);
}
.hero .sub {
  color: #fff;
  margin: 0;
  font-size: 12px;
  letter-spacing: 1px;
  text-shadow: 2px 2px 0 var(--ink);
}

/* Cards */
.card {
  background: var(--paper);
  border: 4px solid var(--ink);
  padding: 18px;
  margin-bottom: 16px;
  box-shadow:
    inset 0 4px 0 rgba(255,255,255,0.5),
    inset 0 -4px 0 rgba(0,0,0,0.15),
    4px 4px 0 var(--ink);
}
.card h3 {
  margin: 0 0 12px;
  font-size: 14px;
  letter-spacing: 1px;
  color: var(--ink);
  padding-bottom: 6px;
  border-bottom: 3px dashed var(--paper-dark);
}
.card.info ol { margin: 0; padding-left: 22px; color: var(--ink); }
.card.info li { margin-bottom: 6px; font-size: 13px; }
.card.info strong { color: var(--redstone-dark); font-size: 15px; }
.card.info em {
  font-style: normal;
  background: var(--gold);
  padding: 0 4px;
  border: 2px solid var(--ink);
}

/* Buttons */
.actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 24px;
}
.btn {
  appearance: none;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  padding: 14px 20px;
  font-size: 14px;
  letter-spacing: 1px;
  background: var(--stone);
  color: var(--ink);
  border: 4px solid var(--ink);
  border-radius: 0;
  box-shadow:
    inset 0 4px 0 rgba(255,255,255,0.4),
    inset 0 -4px 0 rgba(0,0,0,0.25),
    4px 4px 0 var(--ink);
  transition: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  position: relative;
  text-shadow: 1px 1px 0 rgba(255,255,255,0.3);
}
.btn:hover { filter: brightness(1.08); }
.btn:active {
  transform: translate(4px, 4px);
  box-shadow:
    inset 0 4px 0 rgba(255,255,255,0.3),
    inset 0 -4px 0 rgba(0,0,0,0.3),
    0 0 0 var(--ink);
}

.btn.primary {
  background: var(--emerald);
  color: #fff;
  text-shadow: 2px 2px 0 var(--emerald-dark), -1px -1px 0 var(--emerald-dark);
}
.btn.big { padding: 18px 20px; font-size: 16px; letter-spacing: 2px; }
.btn.ghost {
  background: var(--paper-dark);
  color: var(--ink);
}
.btn.small { padding: 6px 12px; font-size: 12px; }
.btn.danger {
  background: var(--tnt);
  color: #fff;
  text-shadow: 2px 2px 0 var(--tnt-dark);
}

/* Test view */
.test-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
  padding: 12px;
  background: var(--stone-dark);
  border: 4px solid var(--ink);
  box-shadow:
    inset 0 4px 0 rgba(255,255,255,0.15),
    inset 0 -4px 0 rgba(0,0,0,0.3),
    4px 4px 0 var(--ink);
}
.progress { flex: 1; }
.progress-bar {
  height: 16px;
  background: var(--ink);
  border: 2px solid var(--ink);
  padding: 0;
  position: relative;
}
.progress-bar span {
  display: block;
  height: 100%;
  background: var(--gold);
  background-image: linear-gradient(180deg,
    var(--gold) 0%, var(--gold) 50%,
    var(--gold-dark) 50%, var(--gold-dark) 100%);
  width: 0%;
  transition: width .25s steps(20);
}
.progress-text {
  text-align: right;
  font-size: 11px;
  color: #fff;
  margin-top: 6px;
  letter-spacing: 1px;
  text-shadow: 2px 2px 0 var(--ink);
}

.char-stage {
  background: var(--paper);
  background-image:
    repeating-linear-gradient(0deg, transparent 0 12px, rgba(0,0,0,0.04) 12px 13px),
    repeating-linear-gradient(90deg, transparent 0 12px, rgba(0,0,0,0.04) 12px 13px);
  border: 4px solid var(--ink);
  padding: 50px 20px 30px;
  text-align: center;
  margin-bottom: 20px;
  box-shadow:
    inset 0 4px 0 rgba(255,255,255,0.5),
    inset 0 -4px 0 rgba(0,0,0,0.15),
    4px 4px 0 var(--ink);
}
.char {
  font-size: 180px;
  font-weight: 900;
  line-height: 1;
  font-family: "PingFang SC", "Microsoft YaHei", "SimHei", sans-serif;
  color: var(--ink);
  user-select: none;
  animation: pop .15s steps(3);
  text-shadow:
    4px 4px 0 var(--paper-dark),
    8px 8px 0 rgba(0,0,0,0.15);
}
@keyframes pop {
  0%   { opacity: 0; transform: scale(.85); }
  100% { opacity: 1; transform: scale(1); }
}
.hint {
  color: var(--dirt-dark);
  font-size: 12px;
  margin-top: 28px;
  letter-spacing: 3px;
}

.judge {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.judge-btn {
  flex-direction: column;
  padding: 26px 12px;
  font-size: 17px;
  gap: 8px;
}
.judge-btn .mark {
  font-size: 52px;
  line-height: 1;
  font-weight: 900;
  display: block;
}
.judge-btn .key {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  opacity: 0.85;
}
.judge-btn.known {
  background: var(--emerald);
  color: #fff;
  text-shadow: 2px 2px 0 var(--emerald-dark);
}
.judge-btn.unknown {
  background: var(--tnt);
  color: #fff;
  text-shadow: 2px 2px 0 var(--tnt-dark);
}

.undo {
  display: block;
  margin: 18px auto 0;
}

/* Result */
.score-card {
  text-align: center;
  padding: 26px 18px;
  background:
    linear-gradient(180deg,
      var(--gold) 0%, var(--gold) 40%,
      var(--gold-dark) 40%, var(--gold-dark) 100%);
}
.score-label {
  color: var(--ink);
  font-size: 12px;
  letter-spacing: 3px;
  text-shadow: 1px 1px 0 rgba(255,255,255,0.4);
}
.score-value {
  font-size: 64px;
  font-weight: 900;
  line-height: 1.1;
  margin: 10px 0;
  color: #fff;
  text-shadow:
    3px 0 0 var(--ink),
    -3px 0 0 var(--ink),
    0 3px 0 var(--ink),
    0 -3px 0 var(--ink),
    3px 3px 0 var(--ink),
    -3px 3px 0 var(--ink),
    4px 4px 0 rgba(0,0,0,0.3);
}
.score-value .unit { font-size: 22px; margin-left: 6px; }
.score-range { color: var(--ink); font-size: 11px; letter-spacing: 1px; }
.score-level {
  display: inline-block;
  margin-top: 14px;
  padding: 8px 14px;
  background: var(--ink);
  color: var(--gold);
  font-size: 12px;
  letter-spacing: 1px;
  border: 3px solid var(--gold-dark);
}

.tiers { display: flex; flex-direction: column; gap: 12px; }
.tier {
  display: grid;
  grid-template-columns: 70px 1fr 60px;
  align-items: center;
  gap: 10px;
  font-size: 12px;
}
.tier-label { color: var(--ink); letter-spacing: 1px; }
.tier-bar {
  height: 14px;
  background: var(--ink);
  border: 2px solid var(--ink);
}
.tier-bar span {
  display: block;
  height: 100%;
  background-image: linear-gradient(180deg,
    var(--emerald) 0%, var(--emerald) 50%,
    var(--emerald-dark) 50%, var(--emerald-dark) 100%);
  transition: width .4s steps(15);
}
.tier-num {
  text-align: right;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
}

.unknown-chars {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.unknown-chars span {
  display: inline-block;
  padding: 6px 10px;
  background: var(--tnt);
  color: #fff;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 18px;
  font-weight: 900;
  border: 2px solid var(--ink);
  text-shadow: 1px 1px 0 var(--tnt-dark);
  box-shadow: 2px 2px 0 var(--ink);
}
.unknown-chars .empty {
  color: var(--emerald-dark);
  font-size: 13px;
  padding: 6px 10px;
  background: transparent;
  font-family: inherit;
  border: none;
  box-shadow: none;
  text-shadow: none;
  letter-spacing: 1px;
}

/* History */
.history-item {
  background: var(--paper);
  border: 4px solid var(--ink);
  padding: 14px 16px;
  margin-bottom: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow:
    inset 0 4px 0 rgba(255,255,255,0.5),
    inset 0 -4px 0 rgba(0,0,0,0.15),
    4px 4px 0 var(--ink);
}
.history-item .date { color: var(--ink); font-size: 12px; letter-spacing: 1px; }
.history-item .score {
  font-size: 24px;
  font-weight: 900;
  color: var(--redstone-dark);
  text-shadow: 2px 2px 0 var(--paper-dark);
}
.history-item .score small { font-size: 11px; color: var(--ink); font-weight: 700; margin-left: 2px; }
.history-empty {
  text-align: center;
  color: var(--ink);
  padding: 40px 0;
  font-size: 13px;
  letter-spacing: 2px;
  opacity: 0.6;
}

/* Mobile */
@media (max-width: 480px) {
  .char { font-size: 140px; }
  .hero h1 { font-size: 22px; }
  .char-stage { padding: 40px 16px 24px; }
  .judge-btn .mark { font-size: 44px; }
  .score-value { font-size: 52px; }
}