:root{
  --bg:#0f1115; --panel:#171a21; --panel2:#1e222c; --line:#2a2f3a;
  --text:#e8eaef; --muted:#9aa3b2; --brand:#6c5ce7; --brand2:#a29bfe;
  --accent:#00d1b2; --warn:#ffb020; --danger:#ff5c7c; --ok:#22c58b;
  --radius:14px; --shadow:0 8px 30px rgba(0,0,0,.35);
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{font-family:"Noto Sans JP","Yu Gothic UI","Meiryo",system-ui,sans-serif;background:var(--bg);color:var(--text);font-size:14px;line-height:1.7}
button{font-family:inherit;cursor:pointer}
#app{display:flex;min-height:100vh}

/* Sidebar */
.sidebar{width:248px;background:linear-gradient(180deg,#14161d,#0f1115);border-right:1px solid var(--line);display:flex;flex-direction:column;position:sticky;top:0;height:100vh}
.brand{display:flex;gap:12px;align-items:center;padding:22px 20px 16px}
.brand-mark{width:42px;height:42px;border-radius:12px;background:linear-gradient(135deg,var(--brand),var(--brand2));display:grid;place-items:center;font-weight:900;font-size:22px;color:#fff;box-shadow:0 6px 16px rgba(108,92,231,.4)}
.brand-name{font-weight:900;letter-spacing:.5px;font-size:18px}
.brand-sub{font-size:11px;color:var(--muted)}
#nav{display:flex;flex-direction:column;gap:2px;padding:8px 12px;flex:1;overflow:auto}
#nav button{display:flex;gap:11px;align-items:center;background:transparent;border:none;color:var(--muted);padding:11px 14px;border-radius:10px;text-align:left;font-size:13.5px;font-weight:500;transition:.15s}
#nav button span{font-size:16px;width:20px;text-align:center}
#nav button:hover{background:var(--panel);color:var(--text)}
#nav button.active{background:linear-gradient(135deg,rgba(108,92,231,.22),rgba(162,155,254,.12));color:#fff;box-shadow:inset 0 0 0 1px rgba(108,92,231,.35)}
.sidebar-foot{padding:14px 18px;border-top:1px solid var(--line);font-size:11px;color:var(--muted)}
.key-status{margin-bottom:6px;padding:6px 10px;border-radius:8px;background:var(--panel);font-size:11px}
.key-status.ok{color:var(--ok)}

/* Main */
.main{flex:1;min-width:0;display:flex;flex-direction:column}
.topbar{display:flex;justify-content:space-between;align-items:center;padding:20px 30px;border-bottom:1px solid var(--line);background:rgba(15,17,21,.7);backdrop-filter:blur(6px);position:sticky;top:0;z-index:5}
.topbar h1{margin:0;font-size:20px;font-weight:900}
.mini-select{background:var(--panel);color:var(--text);border:1px solid var(--line);border-radius:9px;padding:8px 12px;font-size:12.5px}
#views{padding:26px 30px 60px;max-width:1100px}

/* Cards & layout */
.grid{display:grid;gap:16px}
.grid-2{grid-template-columns:1fr 1fr}
.grid-3{grid-template-columns:repeat(3,1fr)}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:20px}
.card h3{margin:0 0 12px;font-size:15px}
.card .desc{color:var(--muted);font-size:12.5px;margin:-6px 0 14px}
.hero{background:linear-gradient(135deg,rgba(108,92,231,.18),rgba(0,209,178,.08));border:1px solid rgba(108,92,231,.3)}
.hero h2{margin:0 0 6px;font-size:24px;font-weight:900}
.hero p{margin:0;color:var(--muted)}

/* Forms */
label{display:block;font-size:12px;color:var(--muted);margin:14px 0 5px;font-weight:500}
input,textarea,select{width:100%;background:var(--panel2);border:1px solid var(--line);color:var(--text);border-radius:10px;padding:11px 13px;font-family:inherit;font-size:13.5px}
input:focus,textarea:focus,select:focus{outline:none;border-color:var(--brand)}
textarea{resize:vertical;min-height:90px;line-height:1.7}
.row{display:flex;gap:12px;flex-wrap:wrap}
.row>*{flex:1;min-width:150px}

.btn{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;border:none;border-radius:10px;padding:12px 20px;font-weight:700;font-size:13.5px;transition:.15s;box-shadow:0 4px 14px rgba(108,92,231,.35)}
.btn:hover{filter:brightness(1.08);transform:translateY(-1px)}
.btn:disabled{opacity:.5;cursor:wait;transform:none}
.btn.ghost{background:transparent;border:1px solid var(--line);color:var(--text);box-shadow:none}
.btn.sm{padding:7px 13px;font-size:12px}
.btn.accent{background:linear-gradient(135deg,var(--accent),#1ee0c3);box-shadow:0 4px 14px rgba(0,209,178,.3)}
.btn.danger{background:transparent;border:1px solid var(--danger);color:var(--danger);box-shadow:none}

/* Misc */
.tag{display:inline-block;padding:3px 10px;border-radius:20px;font-size:11px;background:var(--panel2);border:1px solid var(--line);color:var(--muted);margin:2px 4px 2px 0}
.tag.lv{background:rgba(108,92,231,.15);color:var(--brand2);border-color:transparent}
.pill{display:inline-flex;gap:6px;align-items:center;padding:5px 12px;border-radius:20px;font-size:11.5px;font-weight:700}
.pill.ok{background:rgba(34,197,139,.15);color:var(--ok)}
.pill.warn{background:rgba(255,176,32,.15);color:var(--warn)}
.pill.bad{background:rgba(255,92,124,.15);color:var(--danger)}
.muted{color:var(--muted)}
.mono{font-family:ui-monospace,monospace;font-size:12px}
.output{white-space:pre-wrap;background:var(--panel2);border:1px solid var(--line);border-radius:10px;padding:16px;line-height:1.85;max-height:520px;overflow:auto}
.divider{height:1px;background:var(--line);margin:18px 0}
.empty{text-align:center;color:var(--muted);padding:40px 20px}
.stat{font-size:28px;font-weight:900;background:linear-gradient(135deg,var(--brand2),var(--accent));-webkit-background-clip:text;background-clip:text;color:transparent}
.list-item{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:12px 14px;background:var(--panel2);border:1px solid var(--line);border-radius:10px;margin-bottom:8px}
.chip-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.selectable{padding:14px;border:1px solid var(--line);border-radius:11px;background:var(--panel2);cursor:pointer;transition:.15s}
.selectable:hover{border-color:var(--brand)}
.selectable.sel{border-color:var(--brand);background:rgba(108,92,231,.12)}
.progress{height:8px;background:var(--panel2);border-radius:20px;overflow:hidden}
.progress>i{display:block;height:100%;background:linear-gradient(90deg,var(--brand),var(--accent))}

/* Gantt */
.gantt{overflow:auto;border:1px solid var(--line);border-radius:10px}
.gantt table{border-collapse:collapse;width:100%;font-size:12px}
.gantt th,.gantt td{border:1px solid var(--line);padding:7px 9px;text-align:left;white-space:nowrap}
.gantt th{background:var(--panel2);position:sticky;top:0}
.gantt .phase-row td{background:rgba(108,92,231,.14);font-weight:700}
.gantt .done{text-decoration:line-through;color:var(--muted)}

/* Carousel builder */
.slide-preview{width:100%;aspect-ratio:1/1;border-radius:14px;overflow:hidden;position:relative;box-shadow:var(--shadow)}
.slides-strip{display:flex;gap:10px;overflow-x:auto;padding:6px 2px}
.slide-thumb{width:84px;height:84px;border-radius:10px;flex:0 0 auto;border:2px solid var(--line);cursor:pointer;overflow:hidden}
.slide-thumb.sel{border-color:var(--brand)}

/* Auth */
.auth-wrap{position:fixed;inset:0;display:grid;place-items:center;padding:20px;background:radial-gradient(1200px 600px at 50% -10%,rgba(108,92,231,.25),transparent),var(--bg);overflow:auto}
.auth-card{width:100%;max-width:400px;background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:32px;box-shadow:var(--shadow)}
.auth-brand{display:flex;gap:12px;align-items:center;margin-bottom:20px}
.auth-card h2{margin:0 0 2px;font-size:22px}
.auth-link{color:var(--brand2);text-decoration:none;font-weight:700}
.user-row{display:flex;justify-content:space-between;align-items:center;gap:8px;padding:8px 10px;background:var(--panel);border:1px solid var(--line);border-radius:9px;margin-bottom:8px}
.plan-cur{border-color:var(--brand);box-shadow:inset 0 0 0 1px var(--brand)}
.plan-matsu{border-color:transparent;background:linear-gradient(180deg,rgba(255,176,32,.12),var(--panel));box-shadow:inset 0 0 0 1px rgba(255,176,32,.5),0 8px 30px rgba(255,176,32,.12)}

/* Task rows & detail modal */
.gantt .task-row{cursor:pointer}
.gantt .task-row:hover td{background:rgba(108,92,231,.12)}
.work-dot{font-size:12px;margin-left:4px}
.open-hint{color:var(--muted);font-size:11px;opacity:0;transition:.15s}
.gantt .task-row:hover .open-hint{opacity:1}
.modal-wrap{position:fixed;inset:0;background:rgba(0,0,0,.55);display:grid;place-items:center;padding:20px;z-index:200;backdrop-filter:blur(3px);overflow:auto}
.modal{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:26px;width:100%;max-width:600px;max-height:90vh;overflow:auto;box-shadow:var(--shadow);position:relative}
.modal-x{position:absolute;top:14px;right:14px;background:var(--panel2);border:1px solid var(--line);color:var(--muted);width:32px;height:32px;border-radius:9px;font-size:14px}
.modal-x:hover{color:var(--text)}
.guide-box{background:var(--panel2);border:1px solid var(--line);border-radius:11px;padding:14px 16px;margin:14px 0 4px}
.guide-box ol{margin:8px 0 10px;padding-left:20px}
.guide-box li{font-size:12.5px;color:var(--muted);margin:3px 0;line-height:1.6}
.cost-row{background:var(--panel2);border:1px solid var(--line);border-radius:10px;padding:11px 13px;margin-bottom:8px}
.cost-row a{margin-left:4px}

/* Task action box（作業に進む） */
.act-box{background:rgba(0,209,178,.07);border:1px solid rgba(0,209,178,.35);border-radius:12px;padding:13px 15px;margin:14px 0 0}
.act-box b{font-size:13px;color:var(--accent)}
.act-box .btn{white-space:normal;text-align:left;line-height:1.4}

/* Lesson viewer */
.lesson-box{background:var(--panel2);border:1px solid var(--line);border-radius:12px;padding:14px 16px;margin:14px 0 6px}
.lesson-head{display:flex;justify-content:space-between;align-items:center;gap:8px;margin-bottom:10px}
.lesson-head b{font-size:13.5px}
.fig-wrap{background:#0f1115;border:1px solid var(--line);border-radius:10px;padding:10px 12px 6px;margin-bottom:12px;text-align:center}
.fig-svg{width:100%;max-width:340px;height:auto}
.fig-cap{display:block;font-size:10px;color:var(--muted);margin-top:2px}
.lesson-title{font-weight:700;font-size:14.5px;color:var(--text);margin-bottom:6px}
.lesson-body{font-size:13px;color:#cfd4de;line-height:1.85;white-space:pre-wrap}
.ex-box{background:#12141a;border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:9px;margin-top:12px;overflow:hidden}
.ex-head{display:flex;justify-content:space-between;align-items:center;padding:8px 12px;background:rgba(0,209,178,.08);font-size:11.5px;color:var(--accent);font-weight:700}
.ex-text{margin:0;padding:12px;font-size:12.5px;line-height:1.8;color:#e8eaef;white-space:pre-wrap;font-family:inherit;overflow-x:auto}
.tip-box{margin-top:12px;background:rgba(255,176,32,.1);border:1px solid rgba(255,176,32,.3);border-radius:9px;padding:10px 12px;font-size:12px;color:#ffd08a;line-height:1.7}
.lesson-nav{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:14px}
.ldots{display:flex;gap:6px}
.ldot{width:8px;height:8px;border-radius:50%;background:var(--line);cursor:pointer;transition:.15s}
.ldot.on{background:var(--brand);transform:scale(1.25)}
.lesson-count{text-align:center;font-size:11px;color:var(--muted);margin-top:8px}

.toast{position:fixed;bottom:26px;left:50%;transform:translateX(-50%) translateY(30px);background:#fff;color:#111;padding:12px 22px;border-radius:12px;font-weight:700;font-size:13px;box-shadow:var(--shadow);opacity:0;pointer-events:none;transition:.25s;z-index:100}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
.spin{display:inline-block;width:14px;height:14px;border:2px solid rgba(255,255,255,.4);border-top-color:#fff;border-radius:50%;animation:sp .7s linear infinite;vertical-align:-2px;margin-right:6px}
@keyframes sp{to{transform:rotate(360deg)}}

@media(max-width:820px){
  #app{flex-direction:column}
  .sidebar{width:100%;height:auto;position:relative;flex-direction:row;flex-wrap:wrap}
  #nav{flex-direction:row;flex-wrap:wrap}
  .grid-2,.grid-3{grid-template-columns:1fr}
}