:root {
  --navy: #003a73;
  --navy-dark: #002a54;
  --blue: #009fe6;
  --blue-soft: #e3f4fd;
  --ink: #1c2b36;
  --gray: #5b6b78;
  --line: #dde5ec;
  --bg: #f5f8fa;
  --white: #ffffff;
  --accent: #ff7a45;
  --green: #2bb673;
  --radius: 14px;
  --shadow: 0 2px 12px rgba(0, 42, 84, 0.08);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Noto Sans JP', 'Inter', sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.8;
}

.container { max-width: 980px; margin: 0 auto; padding: 0 20px; }

/* ---------- header / hero(シリーズ共通) ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: var(--navy);
  box-shadow: 0 2px 8px rgba(0,0,0,.15);
}
.header-inner {
  max-width: 980px; margin: 0 auto; padding: 0 20px;
  display: flex; align-items: center; justify-content: space-between;
  height: 58px;
}
.logo { color: #fff; font-weight: 900; font-size: 18px; display: flex; align-items: center; gap: 10px; }
.logo-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 30px; height: 30px; border-radius: 8px;
  background: var(--blue); color: #fff; font-weight: 800; font-size: 15px;
}
.nav { display: flex; gap: 4px; flex-wrap: wrap; }
.nav a {
  color: #cfe3f5; text-decoration: none; font-size: 13px; font-weight: 500;
  padding: 6px 12px; border-radius: 999px; transition: .15s;
}
.nav a:hover { background: rgba(255,255,255,.14); color: #fff; }
.nav { align-items: center; }
.nav .nav-home { background: rgba(255,255,255,.14); color: #fff; font-weight: 700; border: 1px solid rgba(255,255,255,.25); }
.nav .nav-home:hover { background: var(--blue); border-color: var(--blue); }

.hero {
  background: linear-gradient(135deg, var(--navy) 0%, #00518f 70%, #0070b8 100%);
  color: #fff; padding: 64px 0 56px;
}
.hero-eyebrow {
  font-family: 'Inter', sans-serif; font-weight: 600; font-size: 12px;
  letter-spacing: .22em; color: #7fd0f5; margin: 0 0 10px;
}
.hero h1 { font-size: 40px; font-weight: 900; margin: 0 0 16px; letter-spacing: .02em; }
.hero-lead { font-size: 15px; color: #d7e7f5; margin: 0 0 28px; }
.hero-lead strong { color: #fff; }
.hero-steps { display: flex; gap: 10px; flex-wrap: wrap; }
.step-chip {
  background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.3);
  color: #fff; text-decoration: none; font-size: 13px; font-weight: 700;
  padding: 8px 16px; border-radius: 999px; transition: .15s;
}
.step-chip:hover { background: var(--blue); border-color: var(--blue); }

.device-note {
  margin: 28px 0 -8px; background: #fff8f0; border: 1.5px solid #ffd9bd;
  border-radius: 10px; padding: 12px 18px; font-size: 13.5px; color: #6b4a2f;
}
.device-note strong { color: #b34a14; }

/* ---------- lesson(共通) ---------- */
.lesson {
  background: var(--white); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 36px 36px 32px; margin: 36px 0;
}
.lesson-head { display: flex; align-items: center; gap: 14px; margin-bottom: 8px; }
.step-badge {
  background: var(--blue); color: #fff;
  font-family: 'Inter', sans-serif; font-weight: 800; font-size: 12px;
  letter-spacing: .08em; padding: 4px 12px; border-radius: 999px;
}
.lesson h2 { font-size: 24px; font-weight: 900; color: var(--navy); margin: 0; }
.lesson-desc { color: var(--gray); font-size: 14.5px; margin: 10px 0 20px; }
.lesson-desc strong { color: var(--navy); }
.sub-head { color: var(--navy); font-size: 17px; margin: 32px 0 12px; }

.term-grid, .tips-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px; margin-top: 20px;
}
.term-card, .tip-card {
  background: var(--bg); border-radius: 10px; padding: 18px 18px 14px;
  border: 1px solid var(--line);
}
.term-card h3, .tip-card h3 { font-size: 14.5px; color: var(--navy); margin: 6px 0 6px; }
.term-card p, .tip-card p { font-size: 13px; color: var(--gray); margin: 0; line-height: 1.7; }
.term-icon { color: var(--blue); font-size: 18px; font-weight: 900; }

/* ---------- STEP1 キーボードマップ ---------- */
.key-tasks { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.key-task {
  display: flex; align-items: center; gap: 7px;
  background: var(--bg); border: 1.5px solid var(--line); border-radius: 999px;
  padding: 5px 14px 5px 6px; font-size: 12.5px; font-weight: 700; color: var(--gray);
}
.key-task.is-done { background: #f2fbf6; border-color: var(--green); color: #1d7a4d; }
.key-task .practice-check {
  width: 22px; height: 22px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--line); color: #fff; font-weight: 800; font-size: 13px; flex-shrink: 0;
}
.key-task.is-done .practice-check { background: var(--green); }

.kb-focus {
  border: 2px solid var(--line); border-radius: 14px; padding: 14px;
  background: #eef3f7; outline: none; cursor: pointer; transition: border-color .2s;
}
.kb-focus:focus { border-color: var(--blue); cursor: default; }
.kb-hint {
  text-align: center; font-size: 13px; font-weight: 700; color: var(--blue);
  margin-bottom: 10px;
}
.kb-focus:focus .kb-hint { color: var(--green); }
.kb-map { display: flex; flex-direction: column; gap: 5px; user-select: none; -webkit-user-select: none; }
.kb-row { display: flex; gap: 5px; }
.key {
  flex: 1 0 0; height: 44px; border-radius: 7px;
  background: #fff; border: 1px solid #cdd8e0; border-bottom-width: 3px;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 600; color: #44535e;
  position: relative; transition: background .08s, transform .08s;
  white-space: nowrap; overflow: hidden;
}
.key.is-target { background: var(--blue-soft); border-color: #8fd3f3; color: var(--navy); font-weight: 800; }
.key.is-pressed { background: var(--navy); border-color: var(--navy); color: #fff; transform: translateY(2px); border-bottom-width: 1px; }
.key.is-cleared { background: #d9f3e5; border-color: #9adbb9; color: #1d7a4d; }
.key.home::after {
  content: ''; position: absolute; bottom: 6px; left: 50%; transform: translateX(-50%);
  width: 14px; height: 3px; border-radius: 2px; background: #b7c4cd;
}

.practice-done {
  margin-top: 16px; background: #f2fbf6; border: 1.5px solid var(--green);
  border-radius: 10px; padding: 14px 20px; font-size: 14.5px; font-weight: 700; color: #1d7a4d;
}
.practice-done[hidden] { display: none; }

/* ---------- STEP2 疑似IME ---------- */
.ime-steps {
  display: flex; align-items: stretch; gap: 8px; margin-bottom: 18px; flex-wrap: wrap;
}
.ime-step {
  flex: 1; min-width: 140px; text-align: center;
  background: var(--bg); border: 1.5px solid var(--line); border-radius: 10px;
  padding: 10px 8px; font-size: 13px; font-weight: 700; color: var(--gray);
  line-height: 1.6;
}
.ime-step small { font-weight: 500; font-size: 11.5px; }
.ime-step.is-active { border-color: var(--blue); background: var(--blue-soft); color: var(--navy); }
.ime-step.is-done { border-color: var(--green); background: #f2fbf6; color: #1d7a4d; }
.ime-step-num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 20px; height: 20px; border-radius: 50%; background: var(--line); color: #fff;
  font-size: 11px; font-weight: 800; font-family: 'Inter', sans-serif; margin-right: 6px;
}
.ime-step.is-active .ime-step-num { background: var(--blue); }
.ime-step.is-done .ime-step-num { background: var(--green); }
.ime-arrow { display: flex; align-items: center; color: #b5c2cc; font-weight: 800; }

.ime-task {
  font-size: 14.5px; font-weight: 700; color: var(--navy); margin-bottom: 10px;
}
.ime-task .kbd { margin: 0 2px; }
.ime-box {
  border: 2px solid var(--line); border-radius: 12px; background: #fff;
  padding: 22px 26px; outline: none; cursor: text; position: relative;
  transition: border-color .2s;
}
.ime-box:focus { border-color: var(--blue); }
.ime-display { font-size: 30px; font-weight: 500; min-height: 46px; line-height: 1.5; }
.ime-placeholder { color: #b5c2cc; font-size: 16px; }
.ime-composing {
  border-bottom: 2px dotted var(--blue); color: var(--navy);
}
.ime-converting {
  background: var(--blue-soft); border-bottom: 2px solid var(--navy); color: var(--navy);
}
.ime-committed { color: var(--ink); }
.ime-caret {
  display: inline-block; width: 2px; height: 1.1em; background: var(--navy);
  vertical-align: text-bottom; animation: blink 1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }
.ime-candidates {
  position: absolute; left: 26px; top: calc(100% - 6px); z-index: 10;
  background: #fff; border: 1px solid var(--line); border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0,0,0,.15); padding: 4px; min-width: 150px;
}
.ime-candidates[hidden] { display: none; }
.ime-cand {
  padding: 4px 12px; font-size: 14px; border-radius: 5px;
  display: flex; gap: 10px; align-items: center;
}
.ime-cand .cand-num { font-size: 11px; color: #9aa8b3; font-family: 'Inter', sans-serif; }
.ime-cand.is-active { background: var(--blue); color: #fff; }
.ime-cand.is-active .cand-num { color: #cfeeff; }

/* ---------- STEP3 タイピングゲーム ---------- */
.type-stage {
  border: 2px solid var(--line); border-radius: 14px; background: #fff;
  min-height: 260px; display: flex; align-items: center; justify-content: center;
  outline: none; transition: border-color .2s; position: relative; padding: 24px;
}
.type-stage:focus { border-color: var(--blue); }
.type-stage.flash { animation: flash .15s; }
@keyframes flash { 0% { background: #ffe9e6; } 100% { background: #fff; } }
.type-start { text-align: center; }
.type-start p { font-size: 12.5px; color: var(--gray); margin: 10px 0 0; }
.type-play { width: 100%; text-align: center; }
.type-play[hidden] { display: none; }
.type-progress {
  display: flex; justify-content: space-between;
  font-family: 'Inter', sans-serif; font-weight: 600; font-size: 13px; color: var(--gray);
  margin-bottom: 18px;
}
.type-word { font-size: 44px; font-weight: 900; color: var(--navy); line-height: 1.3; }
.type-kana { font-size: 16px; color: var(--gray); margin-top: 2px; }
.type-roma {
  font-family: 'Inter', monospace; font-size: 26px; font-weight: 600;
  letter-spacing: .12em; margin-top: 14px; min-height: 36px;
}
.type-roma .done { color: var(--blue); }
.type-roma .rest { color: #b5c2cc; }
.type-result { text-align: center; }
.type-result[hidden] { display: none; }
.type-rank {
  font-family: 'Inter', sans-serif; font-size: 72px; font-weight: 800; color: var(--accent);
  line-height: 1;
}
.type-result-body p { margin: 10px 0 4px; font-weight: 900; color: var(--navy); font-size: 17px; }
.type-result-body .result-detail { font-weight: 500; }
.type-result-body .btn { margin-top: 14px; }

/* ---------- toolbar / kbd / table / note(共通) ---------- */
.toolbar { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-top: 14px; }
.btn {
  font-family: inherit; font-size: 13.5px; font-weight: 700;
  padding: 9px 18px; border-radius: 999px; cursor: pointer;
  border: 1.5px solid var(--line); background: #fff; color: var(--navy); transition: .15s;
}
.btn:hover { border-color: var(--blue); color: var(--blue); }
.btn-primary { background: var(--navy); border-color: var(--navy); color: #fff; }
.btn-primary:hover { background: var(--navy-dark); color: #fff; }
.btn-accent { background: var(--accent); border-color: var(--accent); color: #fff; font-size: 16px; padding: 12px 32px; }
.btn-accent:hover { background: #e8642f; border-color: #e8642f; color: #fff; }
.status { font-size: 13px; color: var(--gray); }

.result-detail { font-size: 13px; color: var(--gray); }

.kbd {
  display: inline-block; background: var(--navy); color: #fff;
  font-size: 11.5px; font-weight: 700; padding: 2px 9px; border-radius: 6px; white-space: nowrap;
}
.sym {
  display: inline-block; font-family: 'Inter', monospace; font-weight: 800;
  font-size: 16px; color: var(--navy); background: var(--bg);
  border: 1px solid var(--line); border-radius: 6px; width: 32px; text-align: center;
}
.shortcut-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.shortcut-table th, .shortcut-table td {
  text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--line);
}
.shortcut-table th { background: var(--bg); color: var(--navy); font-size: 12.5px; }
.shortcut-table td:first-child { width: 190px; }

.note {
  margin-top: 18px; background: #fff8f0; border: 1px solid #ffd9bd;
  border-radius: 10px; padding: 16px 20px; font-size: 13.5px; color: #6b4a2f;
}
.note .kbd { background: var(--accent); }

.toast {
  position: fixed; left: 50%; bottom: 28px; transform: translateX(-50%);
  background: var(--navy); color: #fff; font-size: 13.5px; font-weight: 700;
  padding: 10px 22px; border-radius: 999px; box-shadow: 0 6px 20px rgba(0,0,0,.25);
  z-index: 1000; transition: opacity .3s;
}
.toast[hidden] { display: none; }

.site-footer {
  background: var(--navy); color: #9fc0dd; text-align: center;
  padding: 24px 20px; font-size: 12.5px; margin-top: 48px;
}
.site-footer p { margin: 0; }

@media (max-width: 640px) {
  .hero h1 { font-size: 28px; }
  .lesson { padding: 24px 18px; }
  .header-inner { flex-direction: column; height: auto; padding: 10px 20px; gap: 4px; }
  .key { height: 34px; font-size: 9px; }
  .type-word { font-size: 30px; }
  .ime-display { font-size: 22px; }
  .ime-arrow { display: none; }
}

/* ---------- ページ送りナビ ---------- */
.page-nav { display: flex; gap: 12px; align-items: stretch; margin: 44px auto 0; }
.pgnav { flex: 1; display: flex; flex-direction: column; justify-content: center; gap: 3px;
  text-decoration: none; background: #fff; border: 1.5px solid #dde5ec;
  border-radius: 12px; padding: 14px 18px; transition: .15s; box-shadow: 0 2px 12px rgba(0,42,84,.08); }
.pgnav:hover { border-color: #009fe6; transform: translateY(-2px); }
.pgnav.prev { text-align: left; }
.pgnav.next { text-align: right; }
.pgnav.top { flex: 0 0 130px; text-align: center; background: #003a73; border-color: #003a73; }
.pgnav.top .pgnav-dir, .pgnav.top .pgnav-name { color: #fff; }
.pgnav.top:hover { background: #002a54; border-color: #002a54; }
.pgnav-dir { font-size: 12px; font-weight: 700; color: #ff7a45; }
.pgnav-name { font-size: 14px; font-weight: 900; color: #003a73; }
.pgnav.is-disabled { visibility: hidden; }
@media (max-width: 560px) {
  .page-nav { flex-wrap: wrap; }
  .pgnav.top { order: -1; flex-basis: 100%; }
}