@import url('https://fonts.googleapis.com/css2?family=Rounded+Mplus+1c:wght@400;700;900&display=swap');

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
--c-bg:#FFF9F0;--c-text:#2D2D2D;--c-text-light:#6B7280;
--c-card:#FFFFFF;--c-border:#E8E0D4;
--c-accent:#FF6B6B;--c-accent2:#FFE66D;
--c-correct:#4ADE80;--c-wrong:#FF6B6B;
--c-grade:#4ADE80;
--c-grade-light:#4ADE8022;
--c-grade-mid:#4ADE8066;
--radius-sm:8px;--radius-md:14px;--radius-lg:20px;--radius-xl:28px;
--shadow-sm:0 2px 8px rgba(0,0,0,.06);
--shadow-md:0 4px 20px rgba(0,0,0,.08);
--shadow-lg:0 8px 40px rgba(0,0,0,.12);
--shadow-glow:0 0 20px var(--c-grade-mid);
--font:-apple-system,BlinkMacSystemFont,'Hiragino Sans','Hiragino Kaku Gothic ProN','Yu Gothic Medium','Yu Gothic',sans-serif;
--font-display:'Rounded Mplus 1c',var(--font);
--grid-size:10;
}

html{font-size:16px;scroll-behavior:smooth}
body{
font-family:var(--font-display);color:var(--c-text);
background:var(--c-bg);min-height:100vh;
overflow-x:hidden;position:relative;
}
body::before{
content:'';position:fixed;inset:0;z-index:-1;
background:
  radial-gradient(circle at 20% 20%,var(--c-grade-light) 0%,transparent 50%),
  radial-gradient(circle at 80% 80%,rgba(255,230,109,.08) 0%,transparent 50%),
  repeating-linear-gradient(0deg,transparent,transparent 24px,var(--c-border) 24px,var(--c-border) 25px);
opacity:.4;
}

.screen{display:none;min-height:100vh;padding-bottom:80px;animation:fadeIn .4s ease}
.screen.active{display:block}
@keyframes fadeIn{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}

/* ===== NAV ===== */
.bottom-nav{
position:fixed;bottom:0;left:0;right:0;z-index:100;
background:var(--c-card);border-top:2px solid var(--c-border);
display:flex;justify-content:space-around;padding:6px 0 env(safe-area-inset-bottom,8px);
box-shadow:0 -4px 20px rgba(0,0,0,.06);
}
.bottom-nav button{
background:none;border:none;display:flex;flex-direction:column;align-items:center;
padding:4px 8px;font-size:10px;color:var(--c-text-light);cursor:pointer;
font-family:var(--font-display);transition:all .2s;gap:2px;
}
.bottom-nav button .nav-icon{font-size:22px;line-height:1}
.bottom-nav button.active{color:var(--c-grade);font-weight:700}
.bottom-nav button.active .nav-icon{transform:scale(1.15)}

/* ===== HEADER ===== */
.header{
padding:16px 20px 12px;display:flex;align-items:center;justify-content:space-between;
}
.header-title{
font-size:22px;font-weight:900;
color:var(--c-grade);
}
.header-level{
background:var(--c-card);border:2px solid var(--c-border);border-radius:var(--radius-xl);
padding:4px 14px;font-size:13px;font-weight:700;
display:flex;align-items:center;gap:6px;
}

/* ===== CARDS ===== */
.card{
background:var(--c-card);border-radius:var(--radius-lg);
border:2px solid var(--c-border);padding:20px;
box-shadow:var(--shadow-sm);position:relative;overflow:hidden;
}
.card::before{
content:'';position:absolute;top:0;left:0;right:0;height:4px;
background:linear-gradient(90deg,var(--c-grade),var(--c-accent2));
}

.section-title{
font-size:15px;font-weight:900;margin-bottom:14px;
display:flex;align-items:center;gap:8px;
}

/* ===== HOME SCREEN ===== */
.home-container{padding:0 16px}

.greeting-card{
background:linear-gradient(135deg,var(--c-grade),color-mix(in srgb,var(--c-grade) 70%,#fff));
border-radius:var(--radius-lg);padding:20px;margin-bottom:16px;
color:#fff;border:none;position:relative;overflow:hidden;
}
.greeting-card::after{
content:'';position:absolute;right:-20px;top:-20px;
width:120px;height:120px;border-radius:50%;
background:rgba(255,255,255,.15);
}
.greeting-card h2{font-size:20px;font-weight:900;margin-bottom:4px;text-shadow:0 1px 2px rgba(0,0,0,.1)}
.greeting-card p{font-size:13px;opacity:.9}

.xp-bar-container{
margin-top:12px;background:rgba(255,255,255,.3);border-radius:20px;height:10px;overflow:hidden;
}
.xp-bar{height:100%;background:#fff;border-radius:20px;transition:width .6s ease}

/* Grade selector */
.grade-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:16px}
.grade-btn{
border:2.5px solid var(--c-border);border-radius:var(--radius-md);
padding:14px 8px;text-align:center;cursor:pointer;
background:var(--c-card);transition:all .2s;position:relative;
}
.grade-btn:active{transform:scale(.96)}
.grade-btn.selected{border-color:var(--c-grade);background:var(--c-grade-light);box-shadow:var(--shadow-glow)}
.grade-btn .grade-emoji{font-size:28px;display:block;margin-bottom:4px}
.grade-btn .grade-label{font-size:13px;font-weight:700}

/* Operation selector */
.op-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin-bottom:16px}
.op-btn{
border:2.5px solid var(--c-border);border-radius:var(--radius-md);
padding:16px;text-align:center;cursor:pointer;
background:var(--c-card);transition:all .2s;font-weight:700;font-size:15px;
font-family:var(--font-display);
}
.op-btn:active{transform:scale(.96)}
.op-btn.selected{border-color:var(--c-grade);background:var(--c-grade-light);box-shadow:var(--shadow-glow)}
.op-btn .op-symbol{font-size:24px;display:block;margin-bottom:4px}

.start-btn{
width:100%;padding:18px;border:none;border-radius:var(--radius-xl);
background:var(--c-grade);
color:#fff;font-size:20px;font-weight:900;cursor:pointer;
font-family:var(--font-display);
box-shadow:0 4px 15px var(--c-grade-mid);
transition:all .2s;letter-spacing:.05em;
}
.start-btn:hover{transform:translateY(-2px);box-shadow:0 6px 25px var(--c-grade-mid)}
.start-btn:active{transform:translateY(0)}

/* Streak */
.streak-card{margin-top:16px}
.streak-days{display:flex;gap:6px;justify-content:space-between;margin-top:8px}
.streak-day{
flex:1;text-align:center;padding:8px 2px;border-radius:var(--radius-sm);
background:var(--c-bg);font-size:11px;
}
.streak-day.done{background:var(--c-grade-light);color:var(--c-grade);font-weight:700}
.streak-day.today{border:2px solid var(--c-grade)}
.streak-day .day-label{display:block;font-size:9px;margin-bottom:2px;color:var(--c-text-light)}
.streak-day .day-icon{font-size:16px}

/* ===== PLAY SCREEN ===== */
.play-header{
display:flex;justify-content:space-between;align-items:center;
padding:12px 16px;background:var(--c-card);border-bottom:2px solid var(--c-border);
position:sticky;top:0;z-index:50;
}
.play-timer{font-size:24px;font-weight:900;font-variant-numeric:tabular-nums;letter-spacing:.03em}
.play-progress{font-size:13px;color:var(--c-text-light);font-weight:700}
.play-close{
background:none;border:2px solid var(--c-border);border-radius:50%;
width:36px;height:36px;font-size:18px;cursor:pointer;display:flex;align-items:center;justify-content:center;
}

.grid-wrapper{padding:8px;overflow-x:auto;-webkit-overflow-scrolling:touch}
.grid-table{
border-collapse:collapse;margin:0 auto;
}
.grid-table th,.grid-table td{
width:clamp(30px,8vw,48px);height:clamp(30px,8vw,48px);
text-align:center;vertical-align:middle;
border:1.5px solid var(--c-border);font-size:clamp(13px,3.5vw,18px);
font-weight:700;position:relative;
}
.grid-table th{
background:color-mix(in srgb,var(--c-grade) 15%,#fff);
color:var(--c-text);font-weight:900;
}
.grid-table th.op-cell{
background:var(--c-grade);color:#fff;font-size:clamp(16px,4vw,22px);
}
.grid-table td{background:#fff;cursor:pointer;transition:background .15s}
.grid-table td.focused{background:var(--c-grade-light);box-shadow:inset 0 0 0 2px var(--c-grade)}
.grid-table td.correct{background:#DCFCE7;animation:correctFlash .3s ease}
.grid-table td.wrong{background:#FEE2E2;animation:wrongShake .3s ease}
.grid-table td .cell-input{
width:100%;height:100%;border:none;background:transparent;
text-align:center;font-size:inherit;font-weight:700;font-family:var(--font-display);
color:var(--c-text);outline:none;
}
.grid-table td .cell-input::-webkit-inner-spin-button{display:none}

@keyframes correctFlash{0%{background:#4ADE80}100%{background:#DCFCE7}}
@keyframes wrongShake{0%,100%{transform:none}25%{transform:translateX(-4px)}75%{transform:translateX(4px)}}


/* ===== RESULT SCREEN ===== */
.result-container{padding:20px 16px;text-align:center}
.result-stars{font-size:40px;margin:16px 0;letter-spacing:8px}
.result-card{
background:var(--c-card);border-radius:var(--radius-xl);
padding:28px 24px;border:3px solid var(--c-grade);
box-shadow:var(--shadow-lg);margin-bottom:20px;
}
.result-msg{font-size:24px;font-weight:900;margin-bottom:16px}
.result-stats{display:flex;justify-content:center;gap:32px;margin-bottom:8px}
.result-stat{text-align:center}
.result-stat .stat-label{font-size:12px;color:var(--c-text-light);display:block;margin-bottom:2px}
.result-stat .stat-value{font-size:28px;font-weight:900}

.result-best{
background:linear-gradient(135deg,#FFF7E0,#FFFBEB);
border:2px solid #F59E0B;border-radius:var(--radius-md);
padding:12px 16px;margin:16px 0;font-weight:700;color:#92400E;
display:none;
}
.result-best.show{display:block;animation:bounceIn .5s ease}

.result-badge{
background:linear-gradient(135deg,#F0F0FF,#EEF2FF);
border:2px solid #818CF8;border-radius:var(--radius-md);
padding:12px 16px;margin:12px 0;display:none;
}
.result-badge.show{display:block;animation:bounceIn .5s ease}
.result-badge .badge-icon{font-size:32px}
.result-badge .badge-name{font-weight:900;font-size:15px}

.result-xp{
font-size:14px;color:var(--c-grade);font-weight:700;margin:12px 0;
}

.result-actions{display:flex;flex-direction:column;gap:10px;margin-top:20px}
.btn-primary{
padding:16px;border:none;border-radius:var(--radius-xl);
background:var(--c-grade);
color:#fff;font-size:17px;font-weight:900;cursor:pointer;
font-family:var(--font-display);box-shadow:0 4px 15px var(--c-grade-mid);
}
.btn-secondary{
padding:14px;border:2px solid var(--c-border);border-radius:var(--radius-xl);
background:var(--c-card);font-size:15px;font-weight:700;cursor:pointer;
font-family:var(--font-display);color:var(--c-text);
}

@keyframes bounceIn{0%{transform:scale(0);opacity:0}60%{transform:scale(1.1)}100%{transform:scale(1);opacity:1}}

/* ===== SHARE ===== */
.share-section{margin-top:24px;text-align:center}
.share-canvas{
width:100%;max-width:400px;border-radius:var(--radius-md);
margin:12px auto;display:block;box-shadow:var(--shadow-md);
}
.share-buttons{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:12px}
.share-btn{
padding:10px 20px;border:none;border-radius:var(--radius-xl);
font-size:13px;font-weight:700;cursor:pointer;
font-family:var(--font-display);transition:all .2s;
}
.share-btn:active{transform:scale(.96)}
.share-x{background:#000;color:#fff}
.share-line{background:#06C755;color:#fff}
.share-save{background:var(--c-card);border:2px solid var(--c-border);color:var(--c-text)}
.share-native{background:var(--c-grade);color:#fff}

/* ===== RECORDS SCREEN ===== */
.records-container{padding:16px}
.calendar-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:4px;margin-bottom:20px}
.cal-header{font-size:11px;text-align:center;color:var(--c-text-light);font-weight:700;padding:4px}
.cal-day{
aspect-ratio:1;display:flex;align-items:center;justify-content:center;
border-radius:50%;font-size:12px;font-weight:700;
}
.cal-day.has-record{background:var(--c-grade-light);color:var(--c-grade)}
.cal-day.today{border:2px solid var(--c-grade)}
.cal-day.empty{color:transparent}

.history-list{display:flex;flex-direction:column;gap:8px}
.history-item{
display:flex;justify-content:space-between;align-items:center;
padding:12px 16px;background:var(--c-card);border-radius:var(--radius-md);
border:2px solid var(--c-border);font-size:13px;
}
.history-item .hi-date{color:var(--c-text-light);font-weight:700}
.history-item .hi-op{font-weight:900}
.history-item .hi-time{font-variant-numeric:tabular-nums}
.history-item .hi-score{color:var(--c-grade);font-weight:900}

.chart-container{
background:var(--c-card);border-radius:var(--radius-md);
border:2px solid var(--c-border);padding:16px;margin-bottom:16px;
height:200px;position:relative;
}
.chart-canvas{width:100%;height:100%}

/* ===== BADGES SCREEN ===== */
.badges-container{padding:16px}
.badge-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.badge-item{
text-align:center;padding:16px 8px;background:var(--c-card);
border-radius:var(--radius-md);border:2px solid var(--c-border);
}
.badge-item.locked{opacity:.4;filter:grayscale(1)}
.badge-item .badge-icon{font-size:36px;display:block;margin-bottom:6px}
.badge-item .badge-name{font-size:11px;font-weight:700}
.badge-item .badge-desc{font-size:9px;color:var(--c-text-light);margin-top:2px}

/* ===== PRINT SCREEN ===== */
.print-container{padding:16px}
.print-options{display:flex;flex-direction:column;gap:12px;margin-bottom:20px}
.print-option{
display:flex;justify-content:space-between;align-items:center;
padding:12px 16px;background:var(--c-card);border-radius:var(--radius-md);
border:2px solid var(--c-border);
}
.print-option label{font-weight:700;font-size:14px}
.print-option select,.print-option input{
padding:6px 12px;border:2px solid var(--c-border);border-radius:var(--radius-sm);
font-family:var(--font-display);font-size:14px;
}
.print-preview{
background:#fff;border:2px solid var(--c-border);border-radius:var(--radius-md);
padding:20px;margin-bottom:16px;aspect-ratio:210/297;
max-width:400px;margin-left:auto;margin-right:auto;
overflow:hidden;font-size:10px;
}
.print-preview table{border-collapse:collapse;width:100%;margin-top:8px}
.print-preview th,.print-preview td{
border:1px solid #333;padding:3px;text-align:center;font-size:9px;
width:calc(100%/11);aspect-ratio:1;
}
.print-preview th{background:#f0f0f0;font-weight:700}

.print-btn{
width:100%;padding:16px;border:none;border-radius:var(--radius-xl);
background:var(--c-text);color:#fff;font-size:17px;font-weight:900;
cursor:pointer;font-family:var(--font-display);margin-bottom:10px;
}

/* ===== SETTINGS SCREEN ===== */
.settings-container{padding:16px}
.setting-group{
background:var(--c-card);border-radius:var(--radius-md);
border:2px solid var(--c-border);margin-bottom:12px;overflow:hidden;
}
.setting-item{
display:flex;justify-content:space-between;align-items:center;
padding:14px 16px;border-bottom:1px solid var(--c-border);
}
.setting-item:last-child{border-bottom:none}
.setting-item label{font-weight:700;font-size:14px}
.setting-item input[type=text]{
padding:6px 12px;border:2px solid var(--c-border);border-radius:var(--radius-sm);
font-family:var(--font-display);font-size:14px;text-align:right;width:140px;
}
.setting-item button,.setting-item select{
padding:6px 16px;border:2px solid var(--c-border);border-radius:var(--radius-sm);
background:var(--c-card);font-family:var(--font-display);font-weight:700;
cursor:pointer;font-size:13px;
}
.setting-item .danger{color:#EF4444;border-color:#FECACA}

/* Profile switcher */
.profile-item{
display:flex;justify-content:space-between;align-items:center;
padding:12px 16px;border-bottom:1px solid var(--c-border);
cursor:pointer;transition:all .2s;
}
.profile-item:active{background:var(--c-bg)}
.profile-item.active{background:var(--c-grade-light)}
.profile-item .profile-name{font-weight:700;font-size:14px}
.profile-item .profile-badge{
font-size:11px;background:var(--c-grade);color:#fff;
padding:2px 10px;border-radius:20px;font-weight:700;
}
.profile-item .profile-delete{font-size:14px;padding:4px;cursor:pointer}

/* ===== AFFILIATE / BOOKS ===== */
.books-section{text-align:left;margin-top:24px}
.books-section .section-title{font-size:15px;font-weight:900;margin-bottom:12px;display:flex;align-items:center;gap:8px}
.books-notice{font-size:10px;color:var(--c-text-light);margin-bottom:12px;line-height:1.6}
.book-list{display:flex;flex-direction:column;gap:10px}
.book-card{
display:flex;gap:12px;padding:14px;
background:var(--c-card);border-radius:var(--radius-md);
border:2px solid var(--c-border);text-align:left;
transition:all .2s;
}
.book-card:hover{border-color:var(--c-grade);box-shadow:var(--shadow-sm)}
.book-icon{font-size:36px;flex-shrink:0;display:flex;align-items:center}
.book-info{flex:1;min-width:0}
.book-title{font-size:13px;font-weight:900;line-height:1.4;margin-bottom:4px;color:var(--c-text)}
.book-desc{font-size:11px;color:var(--c-text-light);line-height:1.5;margin-bottom:8px}
.book-links{display:flex;gap:8px;flex-wrap:wrap}
.book-link{
display:inline-flex;align-items:center;gap:4px;
padding:5px 12px;border-radius:20px;font-size:11px;font-weight:700;
text-decoration:none;transition:all .2s;
font-family:var(--font-display);
}
.book-link:active{transform:scale(.96)}
.book-link.amazon{background:#FF9900;color:#fff}
.book-link.amazon:hover{background:#E88B00}
.book-link.rakuten{background:#BF0000;color:#fff}
.book-link.rakuten:hover{background:#A00000}

/* ===== AD CONTAINER ===== */
.ad-container{
background:transparent;border-radius:var(--radius-sm);
text-align:center;color:#999;font-size:12px;
margin:16px;overflow:hidden;
}
.ad-container ins.adsbygoogle{background:transparent!important}
.ad-container ins.adsbygoogle[data-ad-status="unfilled"]{display:none!important;height:0!important}
.ad-container:empty{display:none}

/* ===== CONFETTI ===== */
.confetti-canvas{position:fixed;inset:0;z-index:1000;pointer-events:none}

/* ===== PRIVACY ===== */
.privacy-section{
padding:16px;font-size:13px;line-height:1.8;color:var(--c-text-light);
}
.privacy-section h3{color:var(--c-text);margin:20px 0 8px;font-size:15px;border-bottom:2px solid var(--c-border);padding-bottom:6px}
.privacy-section h3:first-child{margin-top:8px}
.privacy-section h4{color:var(--c-text);margin:12px 0 4px;font-size:13px}
.privacy-section a{color:var(--c-grade);text-decoration:underline}

/* ===== MODAL ===== */
.modal-overlay{
position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:200;
display:none;align-items:center;justify-content:center;padding:20px;
}
.modal-overlay.show{display:flex}
.modal{
background:var(--c-card);border-radius:var(--radius-xl);
padding:28px 24px;max-width:320px;width:100%;text-align:center;
animation:bounceIn .4s ease;
}
.modal h3{font-size:20px;margin-bottom:8px}
.modal .badge-icon{font-size:64px;display:block;margin:16px 0}
.modal button{
margin-top:16px;padding:12px 32px;border:none;border-radius:var(--radius-xl);
background:var(--c-grade);color:#fff;font-size:16px;font-weight:900;
cursor:pointer;font-family:var(--font-display);
}

/* ===== LEVEL UP ===== */
.levelup-effect{
position:fixed;inset:0;z-index:300;display:none;
align-items:center;justify-content:center;
background:rgba(0,0,0,.7);
}
.levelup-effect.show{display:flex}
.levelup-content{
text-align:center;color:#fff;animation:bounceIn .5s ease;
}
.levelup-content .level-num{font-size:80px;font-weight:900;text-shadow:0 0 40px var(--c-grade)}
.levelup-content p{font-size:18px;font-weight:700;margin-top:8px}

/* ===== PRINT STYLES ===== */
@media print{
body{background:#fff!important}
body::before,.bottom-nav,.play-header,.ad-container,
.header,.greeting-card,.streak-card,.no-print{display:none!important}
.screen{display:none!important;padding:0!important}
.screen.print-active{display:block!important}
.print-sheet{
page-break-after:always;padding:10mm;
}
.print-sheet h2{font-size:16pt;margin-bottom:4mm}
.print-sheet .print-info{display:flex;justify-content:space-between;margin-bottom:4mm;font-size:11pt}
.print-sheet table{border-collapse:collapse;width:100%;margin-bottom:4mm}
.print-sheet th,.print-sheet td{
border:0.5pt solid #000;padding:4mm;text-align:center;
font-size:12pt;width:calc(100%/11);
}
.print-sheet th{background:#f0f0f0!important;-webkit-print-color-adjust:exact;print-color-adjust:exact}
.print-sheet .print-footer{font-size:10pt;margin-top:4mm}
@page{size:A4 portrait;margin:15mm}
}

/* ===== RESPONSIVE ===== */
@media(min-width:768px){
.screen{max-width:600px;margin:0 auto}
.bottom-nav{max-width:600px;left:50%;transform:translateX(-50%)}
}

/* ===== TOGGLE ===== */
.toggle{
width:48px;height:26px;border-radius:13px;border:none;
background:var(--c-border);cursor:pointer;position:relative;
transition:background .2s;
}
.toggle.on{background:var(--c-grade)}
.toggle::after{
content:'';position:absolute;top:3px;left:3px;
width:20px;height:20px;border-radius:50%;background:#fff;
transition:transform .2s;box-shadow:0 1px 3px rgba(0,0,0,.2);
}
.toggle.on::after{transform:translateX(22px)}