:root{
  --mincho:"Shippori Mincho B1","Hiragino Mincho ProN","Yu Mincho",serif;
  --gothic:"Zen Kaku Gothic New","Hiragino Kaku Gothic ProN","Yu Gothic",system-ui,sans-serif;
  --latin:"Cormorant Garamond","Baskerville",Georgia,serif;
  --bg:#FBF4F1; --bg-2:#F4E5E2; --surface:#FFFBF9;
  --ink:#2C2130; --ink-soft:#6C5A67; --ink-faint:#9C8894;
  --plum:#8B3A72; --plum-deep:#3E1B39; --rose:#C9738F; --gold:#B08A3C;
  --night:#2A1428; --night-ink:#F6E9EF; --night-soft:#CDB2C3;
  --line:rgba(78,34,71,.15); --line-strong:rgba(78,34,71,.3);
  --on-plum:#F8ECE6; --me:#8B3A72; --on-me:#FFF6FA; --board:#2F4A3A; --chalk:#F3F1E6;
  --shadow:0 18px 44px -30px rgba(70,30,64,.5);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#1B1119; --bg-2:#241723; --surface:#291A27;
    --ink:#F3E6EE; --ink-soft:#C6ABBC; --ink-faint:#9A8192;
    --plum:#D98CBB; --plum-deep:#5A2852; --rose:#E5A0B8; --gold:#D3AE5F;
    --night:#120A11; --line:rgba(240,215,232,.15); --line-strong:rgba(240,215,232,.3);
    --me:#7A2F64; --on-me:#FFF6FA; --board:#22382C; --shadow:0 18px 44px -30px rgba(0,0,0,.8);
    color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --bg:#1B1119; --bg-2:#241723; --surface:#291A27;
  --ink:#F3E6EE; --ink-soft:#C6ABBC; --ink-faint:#9A8192;
  --plum:#D98CBB; --plum-deep:#5A2852; --rose:#E5A0B8; --gold:#D3AE5F;
  --night:#120A11; --line:rgba(240,215,232,.15); --line-strong:rgba(240,215,232,.3);
  --me:#7A2F64; --on-me:#FFF6FA; --board:#22382C; color-scheme:dark;
}
*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--bg);color:var(--ink);font-family:var(--gothic);font-size:16px;line-height:1.85;letter-spacing:.02em;-webkit-text-size-adjust:100%}
h1,h2,h3{font-family:var(--mincho);line-height:1.45;margin:0;text-wrap:balance}
p{margin:0}
a{color:var(--plum)}
button,input,textarea,select{font:inherit;color:inherit}
.wrap{max-width:640px;margin:0 auto;padding-inline:16px}
.hidden{display:none!important}
.eyebrow{font-family:var(--latin);font-style:italic;letter-spacing:.12em;color:var(--rose)}
.muted{color:var(--ink-soft)}
.small{font-size:.86rem}
.center{text-align:center}

.top{position:sticky;top:0;z-index:5;background:color-mix(in srgb,var(--bg) 90%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;gap:10px;height:54px}
.top .logo{font-family:var(--mincho);font-weight:800;white-space:nowrap}
.top .right{margin-left:auto;display:flex;gap:8px;align-items:center;font-size:.78rem;color:var(--ink-soft);min-width:0;overflow:hidden}
.top .right span{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.top .logo .muted{display:none}@media(min-width:440px){.top .logo .muted{display:inline}}

.hero{background:radial-gradient(120% 90% at 50% 0%,#6B2A5E 0%,var(--night) 65%);color:var(--night-ink);padding:24px 0 40px}
.hero img{display:block;width:100%;aspect-ratio:3/2;object-fit:cover;border-radius:16px}
.hero h1{font-size:clamp(1.5rem,6vw,2.1rem);font-weight:800;margin-top:22px;text-align:center}
.hero h1 em{font-style:normal;color:#F2B6CF}
.hero p{color:var(--night-soft);text-align:center;margin-top:10px}

section{padding:36px 0}
.card{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:20px;box-shadow:var(--shadow)}
.card + .card{margin-top:14px}
.title{font-size:1.3rem;font-weight:800}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:999px;padding:13px 24px;background:var(--plum);color:var(--on-plum);font-weight:700;cursor:pointer;text-decoration:none;min-height:46px}
.btn:hover{filter:brightness(1.06)}
.btn:disabled{opacity:.5;cursor:default}
.btn.ghost{background:transparent;color:var(--plum);border:1.5px solid var(--plum)}
.btn.small{padding:7px 14px;min-height:34px;font-size:.86rem}
.btn.block{width:100%}
.btn:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid var(--gold);outline-offset:2px}
label.f{display:block;margin-top:14px;font-weight:700;font-size:.92rem}
label.f small{font-weight:400;color:var(--ink-faint);margin-left:6px}
input.t,textarea.t,select.t{display:block;width:100%;margin-top:6px;padding:12px 14px;border:1px solid var(--line-strong);border-radius:12px;background:var(--bg);font-size:16px}
textarea.t{min-height:110px;resize:vertical}
.err{color:#C0392B;font-size:.9rem;margin-top:10px}

.courses{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:14px}
.course{border:1.5px solid var(--line-strong);border-radius:14px;padding:16px 14px;cursor:pointer;background:var(--bg);text-align:left;min-width:0}
.course[aria-pressed="true"]{border-color:var(--plum);background:color-mix(in srgb,var(--plum) 9%,var(--bg))}
.course b{display:block;font-family:var(--mincho);font-size:1.08rem;color:var(--plum)}
.course span{font-size:.9rem;color:var(--ink-soft)}
@media (max-width:420px){.courses{grid-template-columns:1fr}}
.steps{counter-reset:s;list-style:none;padding:0;margin:14px 0 0}
.steps li{counter-increment:s;position:relative;padding-left:38px;margin-top:10px}
.steps li::before{content:counter(s);position:absolute;left:0;top:2px;width:26px;height:26px;border-radius:50%;background:var(--plum);color:var(--on-plum);font-family:var(--latin);display:flex;align-items:center;justify-content:center;font-size:.9rem}

/* 学生証 */
.idcard{background:var(--plum-deep);color:var(--on-plum);border-radius:16px;padding:20px;position:relative;overflow:hidden}
.idcard .lbl{font-family:var(--latin);font-style:italic;letter-spacing:.14em;opacity:.8;font-size:.9rem}
.idcard .cls{font-family:var(--mincho);font-weight:800;font-size:1.4rem;margin-top:4px}
.idcard .code{font-family:ui-monospace,Menlo,monospace;font-size:1.6rem;letter-spacing:.08em;background:rgba(255,255,255,.1);border-radius:10px;padding:8px 12px;margin-top:12px;display:inline-block;user-select:all}

/* 黒板（今日の時間割） */
.board{background:var(--board);color:var(--chalk);border-radius:14px;padding:14px 16px;border:6px solid #6B4A2E;font-family:var(--mincho)}
.board .row{display:flex;justify-content:space-between;gap:10px;align-items:baseline;flex-wrap:wrap}
.board .day{font-size:1.2rem;font-weight:800}
.board .mode{font-size:.88rem;opacity:.9}
.board button{background:none;border:1px dashed rgba(243,241,230,.6);color:var(--chalk);border-radius:8px;padding:2px 10px;cursor:pointer;font-size:.8rem}

/* モード選び */
.modes{display:grid;gap:12px;margin-top:14px}
.mode-btn{text-align:left;border:1.5px solid var(--line-strong);background:var(--bg);border-radius:14px;padding:16px;cursor:pointer}
.mode-btn b{font-family:var(--mincho);font-size:1.15rem;display:block}
.mode-btn span{font-size:.9rem;color:var(--ink-soft)}
.mode-btn[aria-pressed="true"]{border-color:var(--plum);background:color-mix(in srgb,var(--plum) 9%,var(--bg))}

/* トーク */
.room{display:flex;flex-direction:column;min-height:calc(100dvh - 54px)}
.thread{flex:1;padding:16px 0 12px;display:flex;flex-direction:column;gap:12px}
.msg{display:flex;gap:8px;align-items:flex-end;max-width:100%}
.msg .bubble{padding:10px 14px;border-radius:18px;white-space:pre-wrap;overflow-wrap:anywhere;max-width:min(82%,460px);line-height:1.75}
.msg.me{justify-content:flex-end}
.msg.me .bubble{background:var(--me);color:var(--on-me);border-bottom-right-radius:6px}
.msg.jun .bubble{background:var(--surface);border:1px solid var(--line);border-bottom-left-radius:6px}
.msg .av{width:34px;height:34px;border-radius:50%;object-fit:cover;flex:none}
.msg time{font-size:.7rem;color:var(--ink-faint);white-space:nowrap}
.dayline{align-self:center;font-size:.76rem;color:var(--ink-faint);background:var(--bg-2);border-radius:999px;padding:2px 12px}
.waiting{align-self:center;font-size:.84rem;color:var(--ink-soft);text-align:center;background:var(--bg-2);border-radius:12px;padding:8px 14px}
.composer{position:sticky;bottom:0;background:var(--bg);border-top:1px solid var(--line);padding:10px 0 calc(10px + env(safe-area-inset-bottom))}
.composer .wrap{display:flex;gap:8px;align-items:flex-end}
.composer textarea{display:block;width:100%;min-height:46px;max-height:180px;padding:11px 14px;border:1px solid var(--line-strong);border-radius:22px;background:var(--surface);resize:none;font-size:16px;line-height:1.5}
.composer .btn{padding:11px 18px}
.composer .note{font-size:.74rem;color:var(--ink-faint);margin-top:4px}