:root {
  --primary:#0f766e;--primary-dark:#0d5b52;--primary-light:#ccfbf1;--primary-mid:#14b8a6;
  --accent:#0ea5e9;--accent-light:#e0f2fe;
  --success:#059669;--success-light:#d1fae5;
  --warning:#d97706;--warning-light:#fef3c7;
  --danger:#dc2626;--danger-light:#fee2e2;
  --text:#1e293b;--text-secondary:#475569;--text-muted:#94a3b8;
  --bg:#f0fdfa;--card:#fff;--border:#e2e8f0;--border-strong:#cbd5e1;
  --radius:14px;--radius-sm:8px;
  --shadow:0 2px 8px rgba(0,0,0,0.07);--shadow-md:0 4px 16px rgba(0,0,0,0.1);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{font-family:'Hiragino Kaku Gothic ProN','Hiragino Sans',Meiryo,'Yu Gothic',sans-serif;background:var(--bg);color:var(--text);font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased;}
a{text-decoration:none;color:var(--primary);-webkit-tap-highlight-color:transparent;}
button{-webkit-tap-highlight-color:transparent;cursor:pointer;font-family:inherit;}

/* NAV */
.top-nav{background:rgba(255,255,255,.94);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border);padding:0 16px;position:sticky;top:0;z-index:100;}
.top-nav-inner{height:52px;display:flex;align-items:center;justify-content:space-between;max-width:720px;margin:0 auto;gap:8px;}
.top-nav-logo{font-weight:900;font-size:1rem;color:var(--primary);white-space:nowrap;}
.top-nav-back{font-size:.82rem;font-weight:700;color:var(--text-secondary);padding:6px 14px;border:1.5px solid var(--border);border-radius:20px;background:#fff;white-space:nowrap;transition:all .15s;min-height:36px;display:flex;align-items:center;}
.top-nav-back:hover{border-color:var(--primary);color:var(--primary);}

/* INDEX HERO */
.index-hero{background:linear-gradient(135deg,#0f766e 0%,#14b8a6 55%,#0ea5e9 100%);color:#fff;padding:36px 20px 32px;text-align:center;position:relative;overflow:hidden;}
.index-hero::before{content:'';position:absolute;inset:0;background:url("data:image/svg+xml,%3Csvg width='40' height='40' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%23fff' fill-opacity='.05'%3E%3Ccircle cx='20' cy='20' r='8'/%3E%3C/g%3E%3C/svg%3E");}
.index-hero h1{font-size:1.45rem;font-weight:900;position:relative;margin-bottom:6px;line-height:1.3;}
.index-hero p{font-size:.88rem;opacity:.88;position:relative;line-height:1.6;}
.hero-badge{display:inline-block;background:rgba(255,255,255,.22);border:1px solid rgba(255,255,255,.35);border-radius:20px;padding:3px 12px;font-size:.75rem;font-weight:700;margin-bottom:10px;position:relative;}
.hero-stats{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:14px;position:relative;}
.hero-stat{background:rgba(255,255,255,.15);border-radius:10px;padding:8px 14px;text-align:center;}
.hero-stat-num{font-size:1.3rem;font-weight:800;display:block;}
.hero-stat-label{font-size:.7rem;opacity:.85;}

/* MAIN */
.index-main{max-width:720px;margin:0 auto;padding:20px 16px 80px;}
.page-main{max-width:720px;margin:0 auto;padding:20px 16px 80px;}

/* PROGRESS */
.progress-card{background:var(--card);border-radius:var(--radius);padding:18px 16px;margin-bottom:16px;border:1px solid var(--border);box-shadow:var(--shadow);}
.progress-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px;}
.progress-title{font-size:.85rem;font-weight:700;}
.progress-count{font-size:1.1rem;font-weight:800;color:var(--primary);}
.progress-bar-track{background:var(--border);height:10px;border-radius:10px;overflow:hidden;margin-bottom:10px;}
.progress-bar-fill{height:100%;background:linear-gradient(90deg,var(--primary),var(--primary-mid));border-radius:10px;transition:width .4s ease;}
.progress-stats{display:flex;gap:16px;font-size:.8rem;color:var(--text-secondary);}
.stat-done{color:var(--success);font-weight:700;}

/* TODAY */
.today-section{background:var(--card);border-radius:var(--radius);padding:16px;margin-bottom:16px;border:1px solid var(--border);box-shadow:var(--shadow);}
.section-label{font-size:.78rem;font-weight:800;color:var(--text-muted);text-transform:uppercase;letter-spacing:.08em;margin-bottom:12px;padding-bottom:8px;border-bottom:2px solid var(--border);}
.today-grid{display:flex;flex-direction:column;gap:8px;}
.today-item{display:flex;align-items:center;gap:12px;padding:12px 14px;background:var(--primary-light);border-radius:var(--radius-sm);color:var(--text);transition:all .15s;border:1px solid rgba(15,118,110,.15);}
.today-item:hover{background:#99f6e4;}
.today-num{width:28px;height:28px;background:var(--primary);color:#fff;border-radius:50%;font-size:.8rem;font-weight:800;display:flex;align-items:center;justify-content:center;flex-shrink:0;}
.today-info .today-title{font-size:.88rem;font-weight:700;}
.today-info .today-meta{font-size:.75rem;color:var(--text-muted);}

/* FILTER */
.filter-section{margin-bottom:12px;}
.filter-bar{display:flex;gap:8px;overflow-x:auto;padding:0 16px 6px 0;-ms-overflow-style:none;scrollbar-width:none;}
.filter-bar::-webkit-scrollbar{display:none;}
.filter-btn{padding:7px 14px;border:1.5px solid var(--border);border-radius:20px;background:#fff;font-size:.78rem;font-weight:700;color:var(--text-secondary);white-space:nowrap;transition:all .15s;}
.filter-btn:hover{border-color:var(--primary);color:var(--primary);}
.filter-btn.active{background:var(--primary);border-color:var(--primary);color:#fff;}

/* TOPIC CARD */
.topic-list{display:flex;flex-direction:column;gap:10px;}
.topic-card{background:var(--card);border:1.5px solid var(--border);border-radius:var(--radius);padding:14px 16px;display:flex;gap:12px;align-items:center;transition:all .15s;box-shadow:var(--shadow);min-height:72px;}
.topic-card:hover{border-color:var(--primary);box-shadow:0 4px 16px rgba(15,118,110,.15);transform:translateY(-1px);}
.topic-card:active{transform:none;}
.topic-card.done{background:var(--success-light);border-color:#a7f3d0;}
.topic-card.done .topic-title{color:var(--success);}
.topic-card.hidden{display:none;}
.check-circle{width:32px;height:32px;border:2px solid var(--border);border-radius:50%;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:.9rem;transition:all .2s;color:transparent;}
.topic-card.done .check-circle{background:var(--success);border-color:var(--success);color:#fff;}
.topic-body{flex:1;min-width:0;}
.topic-title{font-size:.9rem;font-weight:700;color:var(--text);line-height:1.3;margin-bottom:4px;}
.topic-meta{display:flex;gap:6px;flex-wrap:wrap;align-items:center;}
.topic-summary{font-size:.75rem;color:var(--text-muted);margin-top:3px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.badge-time{font-size:.7rem;background:#f1f5f9;color:var(--text-secondary);padding:2px 8px;border-radius:10px;font-weight:600;}
.badge-high{background:var(--danger-light);color:var(--danger);font-size:.7rem;padding:2px 8px;border-radius:10px;font-weight:700;}
.badge-mid{background:var(--warning-light);color:var(--warning);font-size:.7rem;padding:2px 8px;border-radius:10px;font-weight:700;}
.badge-low{background:#f1f5f9;color:var(--text-muted);font-size:.7rem;padding:2px 8px;border-radius:10px;font-weight:700;}
.badge-imp{font-size:.72rem;color:var(--warning);letter-spacing:-.05em;}
.badge-cat{font-size:.68rem;background:var(--primary-light);color:var(--primary);padding:2px 6px;border-radius:6px;font-weight:700;}
.topic-arrow{color:var(--text-muted);font-size:.9rem;}
.category-header{font-size:.78rem;font-weight:800;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.08em;padding:4px 0;border-bottom:2px solid var(--border);margin:24px 0 10px;display:flex;align-items:center;gap:8px;}

/* PAGE HERO */
.page-hero{background:linear-gradient(135deg,#0f766e 0%,#14b8a6 80%,#0ea5e9 100%);color:#fff;padding:28px 20px 24px;}
.page-hero-inner{max-width:720px;margin:0 auto;}
.page-hero-meta{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:10px;}
.badge-time{font-size:.7rem;background:#f1f5f9;color:var(--text-secondary);padding:2px 8px;border-radius:10px;font-weight:600;}
.badge-stars{color:#fbbf24;font-size:.85rem;letter-spacing:-.04em;}
.badge-page-high{background:#ef4444;color:#fff;font-size:.72rem;font-weight:700;padding:3px 10px;border-radius:20px;}
.badge-page-mid{background:var(--warning);color:#fff;font-size:.72rem;font-weight:700;padding:3px 10px;border-radius:20px;}
.badge-page-low{background:rgba(255,255,255,.2);color:#fff;font-size:.72rem;font-weight:700;padding:3px 10px;border-radius:20px;}
.page-hero-title{font-size:1.35rem;font-weight:900;line-height:1.3;margin-bottom:6px;}
.page-hero-sub{font-size:.85rem;opacity:.88;line-height:1.6;margin:0;}

/* SECTION CARD */
.section-card{background:var(--card);border-radius:var(--radius);padding:20px 18px;margin-bottom:16px;border:1px solid var(--border);box-shadow:var(--shadow);}
.section-card h2{font-size:1rem;font-weight:800;color:var(--primary);margin-bottom:12px;padding-bottom:8px;border-bottom:2px solid var(--primary-light);display:flex;align-items:center;gap:6px;}
.section-card h3{font-size:.92rem;font-weight:700;color:var(--text);margin:14px 0 6px;}
.section-card p{font-size:.88rem;color:var(--text-secondary);line-height:1.8;margin-bottom:10px;}
.section-card ul,.section-card ol{padding-left:1.2rem;margin-bottom:10px;}
.section-card li{font-size:.88rem;color:var(--text-secondary);line-height:1.8;margin-bottom:4px;}
.section-label-top{display:inline-block;font-size:.7rem;font-weight:800;color:var(--primary);text-transform:uppercase;letter-spacing:.12em;background:var(--primary-light);padding:2px 8px;border-radius:10px;margin-bottom:8px;}

/* CALLOUTS */
.callout{border-radius:var(--radius-sm);padding:12px 14px;margin:12px 0;font-size:.85rem;line-height:1.7;}
.callout-info{background:var(--accent-light);border-left:4px solid var(--accent);border-radius:0 var(--radius-sm) var(--radius-sm) 0;padding:12px 14px;margin:12px 0;font-size:.85rem;color:#0c4a6e;line-height:1.7;}
.callout-warn{background:var(--warning-light);border-left:4px solid var(--warning);border-radius:0 var(--radius-sm) var(--radius-sm) 0;padding:12px 14px;margin:12px 0;font-size:.85rem;color:#78350f;line-height:1.7;}
.callout-tip{background:var(--success-light);border-left:4px solid var(--success);border-radius:0 var(--radius-sm) var(--radius-sm) 0;padding:12px 14px;margin:12px 0;font-size:.85rem;color:#064e3b;line-height:1.7;}
.callout-exam{background:#fef3c7;border:1.5px dashed var(--warning);border-radius:var(--radius-sm);padding:12px 14px;margin:12px 0;font-size:.85rem;color:#78350f;line-height:1.7;}
.callout-mistake{background:var(--danger-light);border-left:4px solid var(--danger);border-radius:0 var(--radius-sm) var(--radius-sm) 0;padding:12px 14px;margin:12px 0;font-size:.85rem;color:#7f1d1d;line-height:1.7;}

/* KEYWORDS */
.kw{background:var(--primary-light);color:var(--primary-dark);padding:1px 6px;border-radius:4px;font-weight:700;font-size:.92em;}
.kw-danger{background:var(--danger-light);color:var(--danger);padding:1px 6px;border-radius:4px;font-weight:700;font-size:.92em;}
.kw-success{background:var(--success-light);color:var(--success);padding:1px 6px;border-radius:4px;font-weight:700;font-size:.92em;}
.kw-warn{background:var(--warning-light);color:var(--warning);padding:1px 6px;border-radius:4px;font-weight:700;font-size:.92em;}

/* CONTENT LIST */
.content-list{list-style:none;padding:0;margin:0 0 12px;}
.content-list li{font-size:.88rem;color:var(--text-secondary);line-height:1.8;padding-left:1.3em;position:relative;margin-bottom:4px;}
.content-list li::before{content:'▸';position:absolute;left:0;color:var(--primary);font-weight:700;}

/* FIGURES */
.fig-box{background:#f0fdfa;border:1px solid #99f6e4;border-radius:var(--radius-sm);padding:16px;margin:14px 0;overflow-x:auto;}
.fig-title{font-size:.78rem;font-weight:700;color:var(--text-muted);text-align:center;margin-bottom:12px;text-transform:uppercase;letter-spacing:.05em;}
.fig-row{display:flex;align-items:center;justify-content:center;gap:8px;flex-wrap:wrap;margin:8px 0;}
.fig-node{background:var(--card);border:2px solid var(--primary);border-radius:10px;padding:10px 14px;text-align:center;font-size:.82rem;font-weight:700;color:var(--primary-dark);min-width:80px;box-shadow:0 2px 6px rgba(15,118,110,.12);}
.fig-node-danger{background:var(--danger-light);border-color:var(--danger);color:var(--danger);}
.fig-node-success{background:var(--success-light);border-color:var(--success);color:var(--success);}
.fig-node-warn{background:var(--warning-light);border-color:var(--warning);color:var(--warning);}
.fig-arrow{color:var(--text-muted);font-size:1.2rem;font-weight:700;flex-shrink:0;}

/* SQL CODE */
.sql-block{background:#0f172a;color:#e2e8f0;border-radius:var(--radius-sm);padding:14px 16px;margin:12px 0;font-family:'Fira Code','Courier New',monospace;font-size:.82rem;line-height:1.8;overflow-x:auto;white-space:pre;}
.sql-kw{color:#7dd3fc;}
.sql-str{color:#86efac;}
.sql-num{color:#fde68a;}
.sql-cmt{color:#64748b;font-style:italic;}

/* TABLE */
.compare-table{width:100%;border-collapse:collapse;font-size:.83rem;margin:12px 0;}
.compare-table th{background:var(--primary);color:#fff;padding:8px 10px;font-weight:700;text-align:left;font-size:.8rem;}
.compare-table th:first-child{border-radius:var(--radius-sm) 0 0 0;}
.compare-table th:last-child{border-radius:0 var(--radius-sm) 0 0;}
.compare-table td{padding:8px 10px;border-bottom:1px solid var(--border);color:var(--text-secondary);vertical-align:top;line-height:1.6;}
.compare-table tr:nth-child(even) td{background:#f0fdfa;}
.compare-table tr:last-child td{border-bottom:none;}

/* QUIZ */
.quiz-section{background:var(--card);border-radius:var(--radius);padding:20px 18px;margin-bottom:16px;border:1.5px solid var(--border);box-shadow:var(--shadow);}
.quiz-title{font-size:.95rem;font-weight:800;color:var(--text);margin-bottom:16px;display:flex;align-items:center;gap:8px;}
.quiz-item{margin-bottom:20px;}
.quiz-q{font-size:.88rem;font-weight:700;color:var(--text);margin-bottom:10px;line-height:1.6;}
.quiz-choices{display:flex;flex-direction:column;gap:8px;margin-bottom:8px;}
.quiz-choice{padding:13px 14px;border:1.5px solid var(--border);border-radius:var(--radius-sm);font-size:.86rem;color:var(--text);background:#fff;text-align:left;transition:border-color .12s,background .12s;line-height:1.5;min-height:48px;}
.quiz-choice:hover:not(:disabled){border-color:var(--primary);background:var(--primary-light);}
.quiz-choice:active:not(:disabled){background:#99f6e4;}
.quiz-choice.correct{background:var(--success-light)!important;border-color:var(--success)!important;color:#065f46!important;font-weight:700;}
.quiz-choice.wrong{background:var(--danger-light)!important;border-color:var(--danger)!important;color:#7f1d1d!important;}
.quiz-choice:disabled{cursor:default;}
.quiz-exp{display:none;margin-top:8px;}
.quiz-exp.show{display:block;animation:slideDown .22s ease;}
.quiz-answer-text{background:var(--success-light);border:1px solid #a7f3d0;border-radius:var(--radius-sm);padding:10px 14px;font-size:.82rem;color:#064e3b;line-height:1.75;}

/* DONE */
.done-area{text-align:center;margin:24px 0 8px;}
.done-note{font-size:.82rem;color:var(--success);margin-top:10px;min-height:1.4em;}
.done-btn{padding:16px 48px;background:var(--primary);color:#fff;border:none;border-radius:var(--radius);font-size:1rem;font-weight:800;transition:all .2s;box-shadow:0 4px 14px rgba(15,118,110,.35);letter-spacing:.04em;min-height:52px;}
.done-btn:hover{background:var(--primary-dark);transform:translateY(-1px);}
.done-btn:active{transform:none;}
.done-btn.done-state{background:var(--success);box-shadow:0 4px 14px rgba(5,150,105,.3);}

/* PAGE NAV */
.page-nav-bottom{display:flex;gap:10px;margin-top:10px;}
.nav-btn-prev,.nav-btn-next{flex:1;padding:14px 16px;border:1.5px solid var(--border);border-radius:var(--radius-sm);background:#fff;font-size:.82rem;font-weight:700;color:var(--text-secondary);text-align:center;transition:all .15s;line-height:1.4;min-height:52px;display:flex;align-items:center;}
.nav-btn-prev{justify-content:flex-start;}
.nav-btn-next{justify-content:flex-end;}
.nav-btn-prev:hover,.nav-btn-next:hover{border-color:var(--primary);color:var(--primary);}

/* SCROLL BAR */
#scrollBar{position:fixed;top:52px;left:0;height:3px;background:linear-gradient(90deg,var(--primary),var(--primary-mid),var(--accent));z-index:200;width:0%;pointer-events:none;border-radius:0 2px 2px 0;}

/* FOOTER */
footer{padding:32px 0;border-top:1px solid var(--border);background:rgba(255,255,255,.7);margin-top:40px;}
footer .footer-inner{max-width:720px;margin:0 auto;padding:0 20px;text-align:center;color:var(--text-muted);font-size:.75rem;}

/* ANIMATIONS */
@keyframes slideDown{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:translateY(0)}}

@media(min-width:600px){.index-hero h1{font-size:1.65rem;}.page-hero-title{font-size:1.55rem;}}
@media(max-width:380px){.page-hero-title{font-size:1.2rem;}.section-card{padding:16px 14px;}.compare-table th,.compare-table td{padding:6px 8px;}.quiz-choice{font-size:.82rem;padding:11px 12px;}}