@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Noto+Sans+JP:wght@300;400;500;700&display=swap');
:root {
  --bg: #0a0a1a; --bg2: #12122a; --bg3: #1a1a3a; --surface: rgba(255,255,255,0.05);
  --glass: rgba(255,255,255,0.08); --glass-border: rgba(255,255,255,0.12);
  --text: #e8e8f0; --text2: #a0a0c0; --text3: #6a6a8a;
  --pink: #ff6b9d; --pink2: #ff4081; --purple: #b388ff; --blue: #64b5f6;
  --green: #69f0ae; --red: #ff5252; --orange: #ffab40; --gold: #ffd740;
  --radius: 16px; --radius-sm: 10px; --shadow: 0 8px 32px rgba(0,0,0,0.4);
}
* { margin:0; padding:0; box-sizing:border-box; }
body { font-family:'Inter','Noto Sans JP',sans-serif; background:var(--bg); color:var(--text); min-height:100vh; overflow-x:hidden; }
body::before { content:''; position:fixed; top:0; left:0; width:100%; height:100%; background:radial-gradient(ellipse at 20% 50%, rgba(255,107,157,0.08) 0%, transparent 50%), radial-gradient(ellipse at 80% 20%, rgba(179,136,255,0.08) 0%, transparent 50%), radial-gradient(ellipse at 50% 80%, rgba(100,181,246,0.06) 0%, transparent 50%); pointer-events:none; z-index:0; }

/* NAV */
.navbar { position:fixed; top:0; left:0; right:0; height:64px; background:rgba(10,10,26,0.85); backdrop-filter:blur(20px); border-bottom:1px solid var(--glass-border); display:flex; align-items:center; padding:0 24px; z-index:100; }
.nav-brand { font-size:1.3rem; font-weight:700; background:linear-gradient(135deg,var(--pink),var(--purple)); -webkit-background-clip:text; -webkit-text-fill-color:transparent; margin-right:auto; cursor:pointer; }
.nav-links { display:flex; gap:4px; }
.nav-link { padding:8px 16px; border-radius:var(--radius-sm); color:var(--text2); text-decoration:none; font-size:.9rem; font-weight:500; cursor:pointer; transition:all .3s; border:none; background:none; }
.nav-link:hover, .nav-link.active { color:var(--pink); background:rgba(255,107,157,0.1); }

/* MAIN */
.main { padding:84px 24px 24px; max-width:1200px; margin:0 auto; position:relative; z-index:1; }
.page { display:none; animation:fadeIn .4s ease; }
.page.active { display:block; }
@keyframes fadeIn { from{opacity:0;transform:translateY(16px)} to{opacity:1;transform:translateY(0)} }

/* CARDS & GLASS */
.card { background:var(--glass); border:1px solid var(--glass-border); border-radius:var(--radius); padding:24px; backdrop-filter:blur(12px); transition:all .3s; }
.card:hover { border-color:rgba(255,107,157,0.3); transform:translateY(-2px); box-shadow:var(--shadow); }
.card-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(280px,1fr)); gap:20px; margin-top:20px; }

/* HEADINGS */
h1 { font-size:2rem; font-weight:700; margin-bottom:8px; }
h2 { font-size:1.4rem; font-weight:600; margin-bottom:16px; color:var(--text); }
h3 { font-size:1.1rem; font-weight:600; margin-bottom:8px; }
.gradient-text { background:linear-gradient(135deg,var(--pink),var(--purple)); -webkit-background-clip:text; -webkit-text-fill-color:transparent; }
.subtitle { color:var(--text2); font-size:.95rem; margin-bottom:24px; }

/* STAT CARDS */
.stat-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(200px,1fr)); gap:16px; margin-bottom:32px; }
.stat-card { text-align:center; padding:20px; }
.stat-value { font-size:2rem; font-weight:700; }
.stat-label { color:var(--text2); font-size:.85rem; margin-top:4px; }
.stat-icon { font-size:1.8rem; margin-bottom:8px; }

/* PROGRESS BAR */
.progress-bar { height:8px; background:var(--bg3); border-radius:4px; overflow:hidden; margin-top:8px; }
.progress-fill { height:100%; border-radius:4px; transition:width .6s ease; }
.progress-fill.pink { background:linear-gradient(90deg,var(--pink),var(--purple)); }
.progress-fill.blue { background:linear-gradient(90deg,var(--blue),var(--purple)); }
.progress-fill.green { background:linear-gradient(90deg,var(--green),var(--blue)); }
.progress-label { display:flex; justify-content:space-between; font-size:.85rem; color:var(--text2); margin-top:4px; }

/* BUTTONS */
.btn { padding:10px 24px; border-radius:var(--radius-sm); border:none; font-size:.9rem; font-weight:600; cursor:pointer; transition:all .3s; font-family:inherit; display:inline-flex; align-items:center; gap:8px; }
.btn-primary { background:linear-gradient(135deg,var(--pink),var(--purple)); color:#fff; }
.btn-primary:hover { transform:translateY(-2px); box-shadow:0 4px 20px rgba(255,107,157,0.4); }
.btn-secondary { background:var(--glass); color:var(--text); border:1px solid var(--glass-border); }
.btn-secondary:hover { border-color:var(--pink); }
.btn-success { background:linear-gradient(135deg,var(--green),#00c853); color:#000; }
.btn-danger { background:linear-gradient(135deg,var(--red),#d50000); color:#fff; }
.btn-sm { padding:6px 14px; font-size:.8rem; }
.btn-lg { padding:14px 32px; font-size:1rem; }
.btn-group { display:flex; gap:12px; flex-wrap:wrap; margin-top:16px; }

/* FLASHCARD */
.flashcard-container { display:flex; flex-direction:column; align-items:center; padding:20px 0; }
.flashcard-wrapper { width:640px; height:400px; perspective:1000px; margin:20px 0; cursor:pointer; max-width:90vw; }
.flashcard-inner { width:100%; height:100%; position:relative; transform-style:preserve-3d; transition:transform .6s cubic-bezier(.4,0,.2,1); }
.flashcard-inner.flipped { transform:rotateY(180deg); }
.flashcard-front, .flashcard-back { position:absolute; width:100%; height:100%; backface-visibility:hidden; border-radius:var(--radius); display:flex; flex-direction:column; align-items:center; justify-content:center; padding:32px; }
.flashcard-front { background:linear-gradient(135deg, #2a1528, #1f1835); border:1px solid rgba(255,107,157,0.3); }
.flashcard-back { background:linear-gradient(135deg, #142030, #132825); border:1px solid rgba(100,181,246,0.3); transform:rotateY(180deg); }
.flashcard-char { font-size:6rem; font-weight:700; font-family:'Noto Sans JP',sans-serif; line-height:1.2; }
.flashcard-hint { font-size:.85rem; color:var(--text3); margin-top:16px; }
.flashcard-romaji { font-size:2rem; font-weight:600; color:var(--blue); }
.flashcard-meaning { font-size:1.2rem; color:var(--text2); margin-top:8px; }
.flashcard-mnemonic { font-size:.9rem; color:var(--text3); margin-top:16px; font-style:italic; text-align:center; }
.flashcard-nav { display:flex; gap:16px; align-items:center; }
.flashcard-counter { color:var(--text2); font-size:.9rem; min-width:80px; text-align:center; }
.flashcard-filters { display:flex; gap:8px; flex-wrap:wrap; margin-bottom:16px; align-items:center; }
.fc-filter-divider { color:var(--text3); font-size:1.2rem; margin:0 4px; user-select:none; }

/* SRS MODE TOGGLE */
.srs-mode-toggle { display:flex; gap:4px; background:var(--surface); border-radius:var(--radius-sm); padding:4px; margin-bottom:16px; max-width:360px; }
.mode-btn { flex:1; padding:10px 16px; text-align:center; border-radius:8px; cursor:pointer; font-size:.9rem; font-weight:500; color:var(--text2); transition:all .3s; border:none; background:none; font-family:inherit; }
.mode-btn.active { background:linear-gradient(135deg,var(--pink),var(--purple)); color:#fff; }
.mode-btn:not(.active):hover { color:var(--text); background:rgba(255,255,255,0.05); }

/* SRS STATUS BAR */
.srs-status-bar { display:flex; gap:12px; margin-bottom:20px; }
.srs-stat { display:flex; align-items:center; gap:8px; padding:10px 16px; border-radius:var(--radius-sm); background:var(--glass); border:1px solid var(--glass-border); flex:1; max-width:180px; }
.srs-stat-icon { font-size:1.1rem; }
.srs-stat-count { font-size:1.4rem; font-weight:700; }
.srs-stat-label { font-size:.75rem; color:var(--text3); }
.srs-new .srs-stat-count { color:var(--blue); }
.srs-learning .srs-stat-count { color:var(--orange); }
.srs-review .srs-stat-count { color:var(--green); }

/* SRS GRADE BAR */
.srs-grade-bar { display:flex; gap:8px; justify-content:center; flex-wrap:wrap; animation:fadeIn .3s ease; }
.grade-btn { display:flex; flex-direction:column; align-items:center; gap:4px; padding:12px 20px; border-radius:var(--radius-sm); border:2px solid transparent; cursor:pointer; font-family:inherit; transition:all .25s ease; min-width:80px; }
.grade-btn:hover { transform:translateY(-3px); }
.grade-label { font-size:.9rem; font-weight:600; }
.grade-interval { font-size:.75rem; opacity:.8; }

.grade-again { background:rgba(255,82,82,0.15); border-color:rgba(255,82,82,0.4); color:var(--red); }
.grade-again:hover { background:rgba(255,82,82,0.25); box-shadow:0 4px 16px rgba(255,82,82,0.3); }
.grade-hard { background:rgba(255,171,64,0.15); border-color:rgba(255,171,64,0.4); color:var(--orange); }
.grade-hard:hover { background:rgba(255,171,64,0.25); box-shadow:0 4px 16px rgba(255,171,64,0.3); }
.grade-good { background:rgba(105,240,174,0.15); border-color:rgba(105,240,174,0.4); color:var(--green); }
.grade-good:hover { background:rgba(105,240,174,0.25); box-shadow:0 4px 16px rgba(105,240,174,0.3); }
.grade-easy { background:rgba(100,181,246,0.15); border-color:rgba(100,181,246,0.4); color:var(--blue); }
.grade-easy:hover { background:rgba(100,181,246,0.25); box-shadow:0 4px 16px rgba(100,181,246,0.3); }

/* SRS QUEUE COUNTER */
.srs-queue-counter { text-align:center; color:var(--text2); font-size:.9rem; margin-bottom:8px; font-weight:500; }
.srs-queue-counter span { color:var(--pink); font-weight:700; font-size:1.1rem; }


/* QUIZ */
.quiz-area { max-width:600px; margin:0 auto; }
.quiz-question { text-align:center; padding:40px 20px; }
.quiz-char { font-size:5rem; font-family:'Noto Sans JP',sans-serif; margin-bottom:16px; }
.quiz-prompt { color:var(--text2); font-size:1rem; margin-bottom:24px; }
.quiz-options { display:grid; grid-template-columns:1fr 1fr; gap:12px; }
.quiz-option { padding:16px; border-radius:var(--radius-sm); background:var(--glass); border:2px solid var(--glass-border); cursor:pointer; font-size:1.1rem; font-family:inherit; color:var(--text); transition:all .3s; text-align:center; }
.quiz-option:hover { border-color:var(--pink); background:rgba(255,107,157,0.1); }
.quiz-option.correct { border-color:var(--green); background:rgba(105,240,174,0.15); animation:pulse .4s; }
.quiz-option.wrong { border-color:var(--red); background:rgba(255,82,82,0.15); animation:shake .4s; }
.quiz-option.disabled { pointer-events:none; opacity:.7; }
.quiz-input { width:100%; padding:14px 20px; border-radius:var(--radius-sm); border:2px solid var(--glass-border); background:var(--glass); color:var(--text); font-size:1.2rem; font-family:inherit; text-align:center; outline:none; transition:border-color .3s; }
.quiz-input:focus { border-color:var(--pink); }
.quiz-score { display:flex; justify-content:center; gap:24px; margin-bottom:16px; }
.quiz-score-item { text-align:center; }
.quiz-score-value { font-size:1.5rem; font-weight:700; }
.quiz-progress { margin-bottom:24px; }
@keyframes pulse { 0%,100%{transform:scale(1)} 50%{transform:scale(1.03)} }
@keyframes shake { 0%,100%{transform:translateX(0)} 25%{transform:translateX(-8px)} 75%{transform:translateX(8px)} }

/* TUTORIAL */
.tutorial-list { display:grid; gap:12px; }
.lesson-card { display:flex; align-items:center; gap:16px; padding:16px 20px; cursor:pointer; }
.lesson-card.locked { opacity:.5; cursor:not-allowed; }
.lesson-card.completed { border-color:rgba(105,240,174,0.3); }
.lesson-num { width:40px; height:40px; border-radius:50%; display:flex; align-items:center; justify-content:center; font-weight:700; font-size:.9rem; flex-shrink:0; }
.lesson-card.completed .lesson-num { background:linear-gradient(135deg,var(--green),#00c853); color:#000; }
.lesson-card:not(.completed):not(.locked) .lesson-num { background:linear-gradient(135deg,var(--pink),var(--purple)); color:#fff; }
.lesson-card.locked .lesson-num { background:var(--bg3); color:var(--text3); }
.lesson-info h3 { margin-bottom:4px; }
.lesson-info p { color:var(--text2); font-size:.85rem; }
.lesson-view { max-width:700px; margin:0 auto; }
.lesson-char-display { text-align:center; padding:40px; }
.lesson-char-display .char { font-size:8rem; font-family:'Noto Sans JP',sans-serif; }
.lesson-char-display .romaji { font-size:2rem; color:var(--pink); margin-top:8px; }
.lesson-char-display .meaning { font-size:1.1rem; color:var(--text2); margin-top:4px; }
.lesson-char-display .mnemonic { color:var(--text3); margin-top:16px; font-style:italic; max-width:400px; margin-left:auto; margin-right:auto; }
.lesson-step-nav { display:flex; justify-content:center; gap:8px; margin:16px 0; }
.lesson-dot { width:10px; height:10px; border-radius:50%; background:var(--bg3); transition:all .3s; }
.lesson-dot.active { background:var(--pink); transform:scale(1.3); }
.lesson-dot.done { background:var(--green); }

/* DATABASE / VOCAB */
.vocab-table { width:100%; border-collapse:collapse; margin-top:16px; }
.vocab-table th { text-align:left; padding:12px; color:var(--text2); font-size:.85rem; border-bottom:1px solid var(--glass-border); }
.vocab-table td { padding:12px; border-bottom:1px solid rgba(255,255,255,0.04); font-size:.95rem; }
.vocab-table tr:hover td { background:rgba(255,107,157,0.05); }
.vocab-char { font-family:'Noto Sans JP',sans-serif; font-size:1.3rem; }
.search-box { width:100%; padding:12px 20px; border-radius:var(--radius-sm); border:1px solid var(--glass-border); background:var(--glass); color:var(--text); font-size:.95rem; font-family:inherit; outline:none; margin-bottom:16px; transition:border-color .3s; }
.search-box:focus { border-color:var(--pink); }
.tabs { display:flex; gap:4px; margin-bottom:20px; background:var(--surface); border-radius:var(--radius-sm); padding:4px; }
.tab { flex:1; padding:10px; text-align:center; border-radius:8px; cursor:pointer; font-size:.9rem; font-weight:500; color:var(--text2); transition:all .3s; border:none; background:none; font-family:inherit; }
.tab.active { background:linear-gradient(135deg,var(--pink),var(--purple)); color:#fff; }

/* MODAL */
.modal-overlay { position:fixed; inset:0; background:rgba(0,0,0,0.6); backdrop-filter:blur(4px); display:flex; align-items:center; justify-content:center; z-index:200; animation:fadeIn .2s; }
.modal { background:var(--bg2); border:1px solid var(--glass-border); border-radius:var(--radius); padding:32px; max-width:480px; width:90%; max-height:80vh; overflow-y:auto; }
.modal h2 { margin-bottom:16px; }
.modal-field { margin-bottom:16px; }
.modal-field label { display:block; font-size:.85rem; color:var(--text2); margin-bottom:6px; }
.modal-field input, .modal-field select { width:100%; padding:10px 14px; border-radius:8px; border:1px solid var(--glass-border); background:var(--glass); color:var(--text); font-size:.95rem; font-family:inherit; outline:none; }
.modal-field input:focus, .modal-field select:focus { border-color:var(--pink); }

/* BADGE */
.badge { display:inline-block; padding:3px 10px; border-radius:20px; font-size:.75rem; font-weight:600; }
.badge-pink { background:rgba(255,107,157,0.2); color:var(--pink); }
.badge-blue { background:rgba(100,181,246,0.2); color:var(--blue); }
.badge-green { background:rgba(105,240,174,0.2); color:var(--green); }
.badge-gold { background:rgba(255,215,64,0.2); color:var(--gold); }

/* LEVEL INDICATOR */
.level-dots { display:flex; gap:4px; }
.level-dot { width:8px; height:8px; border-radius:50%; background:var(--bg3); }
.level-dot.filled { background:var(--green); }

/* TOAST */
.toast { position:fixed; bottom:24px; right:24px; padding:14px 24px; border-radius:var(--radius-sm); color:#fff; font-weight:500; z-index:300; animation:slideUp .3s ease; }
.toast.success { background:linear-gradient(135deg,var(--green),#00c853); color:#000; }
.toast.error { background:linear-gradient(135deg,var(--red),#d50000); }
@keyframes slideUp { from{opacity:0;transform:translateY(20px)} to{opacity:1;transform:translateY(0)} }

/* SAKURA PARTICLES */
.sakura { position:fixed; pointer-events:none; z-index:0; }
.petal { position:fixed; width:12px; height:12px; background:radial-gradient(circle, rgba(255,107,157,0.6), rgba(255,107,157,0)); border-radius:50% 0 50% 0; animation:fall linear infinite; pointer-events:none; }
@keyframes fall { 0%{transform:translateY(-10vh) rotate(0deg); opacity:0.7} 100%{transform:translateY(110vh) rotate(720deg); opacity:0} }

/* RESPONSIVE */
@media(max-width:768px) {
  .navbar { padding:0 12px; }
  .nav-links { position:fixed; bottom:0; left:0; right:0; top:auto; background:rgba(10,10,26,0.95); backdrop-filter:blur(20px); border-top:1px solid var(--glass-border); padding:8px; justify-content:space-around; }
  .nav-link { font-size:.75rem; flex-direction:column; padding:6px 8px; }
  .main { padding:76px 12px 80px; }
  .stat-grid { grid-template-columns:1fr 1fr; }
  .flashcard-wrapper { width:340px; height:350px; }
  .flashcard-char { font-size:4.5rem; }
  .quiz-options { grid-template-columns:1fr; }
  .card-grid { grid-template-columns:1fr; }
}
@media(max-width:480px) {
  h1 { font-size:1.5rem; }
  .stat-grid { grid-template-columns:1fr; }
}