@import url("https://fonts.googleapis.com/css2?family=Atkinson+Hyperlegible:ital,wght@0,400;0,700;1,400&family=Lexend:wght@500;600;700&family=JetBrains+Mono:wght@500&display=swap");
/* Hocanot — tek sütun okuma alanı; "Sınıfta göster" = yeşil tahta */
:root{--bg:#f6f8f7;--card:#fff;--ink:#17232b;--quiet:#51616b;--line:#dbe3e1;--accent:#1f6b57;--accent-soft:#e3efe9;--tint:#eef2f0;
--board:#1f4a3d;--board-ink:#f3f1e6;--chalk:#f2d36b;--warn-soft:#fbf1dc;--warn-ink:#7a5410;
--f-display:"Lexend",system-ui,sans-serif;--f-body:"Atkinson Hyperlegible",system-ui,-apple-system,"Segoe UI",sans-serif;--f-code:"JetBrains Mono",ui-monospace,monospace;
--cds-text-primary:#17232b;--cds-text-secondary:#51616b;--cds-chart-axis:#8a938f;--cds-chart-categorical-1:#2f6fb3;--cds-chart-reference-tint:#eef2f0;--cds-chart-status-warning:#d99a1e;--cds-chart-status-critical:#c8452f;color-scheme:light}
@media (prefers-color-scheme:dark){:root{--bg:#121a1d;--card:#182226;--ink:#e7ecea;--quiet:#a3b0ad;--line:#2a383b;--accent:#6cc3a6;--accent-soft:#1d3530;--tint:#223035;
--board:#173a30;--warn-soft:#33291a;--warn-ink:#f0c879;
--cds-text-primary:#e7ecea;--cds-text-secondary:#a3b0ad;--cds-chart-axis:#7d8986;--cds-chart-categorical-1:#6aa5e6;--cds-chart-reference-tint:#223035;--cds-chart-status-warning:#e3ad3c;--cds-chart-status-critical:#e06a52;color-scheme:dark}}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.6 var(--f-body)}
.wrap{max-width:46rem;margin:0 auto;padding:0 max(16px,env(safe-area-inset-right)) 56px max(16px,env(safe-area-inset-left))}
a{color:var(--accent);text-underline-offset:3px}
.brand{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:18px 0 6px}
.brand a.logo{font:700 1.35rem/1 var(--f-display);color:var(--ink);text-decoration:none;letter-spacing:-.01em}
.brand a.logo span{color:var(--accent)}
.brand a.req{font:600 .9rem/1 var(--f-display);text-decoration:none}
.top{display:flex;flex-wrap:wrap;gap:6px;align-items:center;font-size:.9rem;color:var(--quiet);padding:4px 0 14px;margin-bottom:8px}
.top a{text-decoration:none}.top .sep{color:var(--quiet)}
h1,h2,h3{font-family:var(--f-display);text-wrap:balance;line-height:1.22}
h1{font-size:clamp(1.55rem,4.5vw,2.1rem);font-weight:700;letter-spacing:-.015em;margin:.3em 0 .5em}
h2{font-size:1.2rem;font-weight:600;margin:2em 0 .6em}
article.note h2{counter-increment:sec;display:flex;gap:10px;align-items:baseline}
article.note{counter-reset:sec}
article.note h2::before{content:counter(sec);font:500 .8rem/1 var(--f-code);color:var(--quiet)}
article.note > p:first-of-type{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px 18px}
article.note ul{list-style:none;padding:0;display:grid;gap:10px}
article.note ul li{padding-left:1.3rem;position:relative;max-width:65ch}
article.note ul li::before{content:"";position:absolute;left:0;top:.68em;width:.5rem;height:.5rem;border-radius:2px;background:var(--accent)}
li p{margin:0}
.tw{overflow-x:auto;margin:.6em 0;border:1px solid var(--line);border-radius:12px;background:var(--card)}
table{border-collapse:collapse;width:100%;font-size:.98rem}
th,td{text-align:left;vertical-align:top;padding:10px 12px;border-bottom:1px solid var(--line)}
th{font:600 .76rem/1.2 var(--f-display);text-transform:uppercase;letter-spacing:.07em;color:var(--quiet);background:var(--tint)}
tr:last-child td{border-bottom:0}
figure{margin:1.2em 0;padding:12px;overflow-x:auto;background:var(--card);border:1px solid var(--line);border-radius:12px}
figure svg{width:100%;min-width:620px;height:auto;display:block;font-family:var(--f-body)}
.hint{display:none;font-size:13px;color:var(--quiet);margin:-.6em 0 1em}@media (max-width:640px){.hint{display:block}}
.lead{color:var(--quiet);font-size:1rem;margin-top:-.2em}
.grade{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px 16px;margin:16px 0}
.grade h2{margin:0 0 .3em}
.unit{margin:.8em 0 .2em;font-weight:700}
.unit.soon{color:var(--quiet);font-weight:400}
.notes{list-style:none;padding:0;margin:.4em 0;display:grid;border-top:1px solid var(--line)}
.notes a{display:block;padding:14px 4px;border-bottom:1px solid var(--line);text-decoration:none;color:var(--ink)}
.notes a:hover{background:var(--accent-soft)}
.notes b{color:var(--accent);font:600 .92rem/1.3 var(--f-code);margin-right:8px}
.subj a{font-size:1.05rem}.subj b{display:block;font:700 1.05rem/1.3 var(--f-body);color:var(--ink)}
.grades{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;border:0}
.grades a{border:1px solid var(--line);border-radius:10px;background:var(--card);padding:16px 10px;text-align:center}
.grades a b{font:700 1.15rem/1.2 var(--f-display)}
@media (max-width:520px){.grades{grid-template-columns:repeat(3,1fr)}}
.pn{display:flex;justify-content:space-between;gap:12px;margin-top:32px}
.pn a{text-decoration:none;font:600 .95rem/1 var(--f-display);padding:12px 16px;border:1px solid var(--line);border-radius:10px;background:var(--card)}
form label{display:block;margin:14px 0;font:600 .95rem/1.3 var(--f-display)}
form input,form select,form textarea{display:block;width:100%;margin-top:6px;padding:12px;font:inherit;color:var(--ink);background:var(--card);border:1px solid var(--line);border-radius:10px}
button,.cta{display:inline-block;padding:12px 18px;border:0;border-radius:10px;background:var(--accent);color:var(--card);font:600 1rem/1.1 var(--f-display);text-decoration:none;cursor:pointer;min-height:44px}
.cta{display:block;text-align:center;margin:20px 0}
.cta.small{display:inline-block;margin:8px 0 0;padding:8px 14px;font-size:.92rem;min-height:0}
:focus-visible{outline:3px solid var(--chalk);outline-offset:2px}
.soon{color:var(--quiet);padding:10px 4px}
.msgbar{display:block;margin:16px 0;padding:14px 16px;border-radius:12px;background:var(--card);border:1px solid var(--line);color:var(--ink);text-decoration:none}
.msgbar b{display:block;font-family:var(--f-display);color:var(--accent)}.msgbar span{display:block;font-size:13px;color:var(--quiet)}
.msg{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 16px;margin:14px 0}
.mhead{display:flex;justify-content:space-between;gap:8px;flex-wrap:wrap;margin-bottom:6px}.mhead span{color:var(--quiet);font-size:13px}
/* haftanın konusu kartı = yeşil tahta */
.wkcard{background:var(--board);color:var(--board-ink);border-radius:14px;padding:20px;margin:14px 0}
.wkhead{font:600 .76rem/1.2 var(--f-display);text-transform:uppercase;letter-spacing:.09em;color:var(--chalk);margin-bottom:8px}
.wktitle{display:block;font:600 1.3rem/1.3 var(--f-display);color:var(--board-ink);text-decoration:none;margin-bottom:12px}
.wktitle b{color:var(--chalk);font-family:var(--f-code);font-size:.95rem;display:block;margin-bottom:4px}
.wkcard a{color:var(--chalk)}
.wkbtn{display:flex;justify-content:space-between;gap:8px}
.wkcard button{font:600 .92rem/1 var(--f-display);padding:10px 14px;border-radius:10px;border:1px solid rgba(243,241,230,.4);background:transparent;color:var(--board-ink);cursor:pointer;margin-top:8px;min-height:40px}
.wkcard .wkmark,button.wkmark{background:var(--chalk);color:#1b2a22;border:0}
button.wkmark{margin-top:18px}
.wklink{background:none!important;border:0!important;color:var(--chalk)!important;text-decoration:underline}
.wkbody{margin-top:8px}
footer{margin-top:40px;color:var(--quiet);font-size:13px;border-top:1px solid var(--line);padding-top:14px}
/* öğretmen notu + sınıfta göster */
.tips{background:var(--warn-soft);border-radius:12px;padding:14px 16px}
.mine{width:100%;min-height:120px;border:1px dashed var(--line);border-radius:10px;padding:12px;font:inherit;background:var(--card);color:var(--ink);resize:vertical}
.showbtn{margin:0 0 6px}
.show{position:fixed;inset:0;z-index:50;background:var(--board);color:var(--board-ink);display:grid;grid-template-rows:auto 1fr auto;padding:calc(14px + env(safe-area-inset-top)) max(20px,env(safe-area-inset-right)) calc(14px + env(safe-area-inset-bottom)) max(20px,env(safe-area-inset-left))}
.show[hidden]{display:none}
.show .bar{display:flex;justify-content:space-between;align-items:center;gap:12px;font:600 .95rem/1.3 var(--f-display)}
.show .bar b{color:var(--chalk);font-family:var(--f-code)}
.show .slide{display:grid;place-items:center;overflow:auto;padding:12px 0}
.show .txt{font:400 clamp(1.6rem,4.2vw,3.4rem)/1.35 var(--f-body);max-width:28ch;text-wrap:balance}
.show .txt b{color:var(--chalk)}
.show .fig{background:#f7f6ef;border-radius:12px;padding:12px;width:min(100%,1100px)}
.show .fig svg{width:100%;height:auto;display:block;--cds-text-primary:#17232b;--cds-text-secondary:#51616b;--cds-chart-axis:#8a938f;--cds-chart-categorical-1:#2f6fb3;--cds-chart-reference-tint:#e8ece6;--cds-chart-status-warning:#c98a12;--cds-chart-status-critical:#c8452f}
.show .ctl{display:flex;justify-content:space-between;align-items:center;gap:12px}
.show .bar .x,.show .ctl button{background:transparent;border:1px solid rgba(243,241,230,.4);color:var(--board-ink)}
.show .ctl button.next{background:var(--chalk);color:#1b2a22;border:0}
.dots{display:flex;gap:6px;flex-wrap:wrap;justify-content:center}
.dots i{width:10px;height:10px;border-radius:50%;background:rgba(243,241,230,.3)}.dots i.on{background:var(--chalk)}
/* hesap & tanıtım */
.authform{display:grid;gap:4px;max-width:30rem}
.authform button[type=submit]{margin-top:8px;width:100%}
.check{display:flex!important;gap:10px;align-items:flex-start;font-weight:400!important;font-family:var(--f-body)!important}
.check input{width:auto!important;margin:4px 0 0!important}
.err{color:var(--cds-chart-status-critical);min-height:1.2em;margin:6px 0 0;font-weight:700}
.ok{color:var(--accent);font-weight:700}
.quiet{color:var(--quiet);font-size:.92rem}
.steps{list-style:none;display:flex;gap:8px;padding:0;margin:8px 0 0;flex-wrap:wrap;counter-reset:st}
.steps li{counter-increment:st;font:600 .8rem/1 var(--f-display);color:var(--quiet);padding:8px 10px;border:1px solid var(--line);border-radius:999px}
.steps li::before{content:counter(st) ". "}
.steps li.on{background:var(--accent);color:var(--card);border-color:var(--accent)}
.steps li.done{color:var(--accent);border-color:var(--accent)}
.eyebrow{font:600 .78rem/1.2 var(--f-display);text-transform:uppercase;letter-spacing:.09em;color:var(--accent);margin:0}
.hero{padding:28px 0 8px}
.hero h1{font-size:clamp(1.8rem,5.5vw,2.7rem);margin:.35em 0 .4em}
.row{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}
.cta.inline{display:inline-block;margin:0}
.ghostbtn{background:var(--card)!important;color:var(--ink)!important;border:1px solid var(--line)!important}
.feat{display:grid;grid-template-columns:1fr 1fr;gap:18px 24px;margin:34px 0;padding:24px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.feat h2{margin:0 0 .3em;font-size:1.05rem}.feat p{margin:0;color:var(--quiet)}
@media (max-width:560px){.feat{grid-template-columns:1fr}}
.sample{background:var(--board);color:var(--board-ink);border-radius:14px;padding:22px}
.sample .eyebrow{color:var(--chalk)}.sample h2{margin:.4em 0 .6em}.sample .code{color:var(--chalk);font-family:var(--f-code);font-size:.9rem;margin-right:8px}
.sample .quiet{color:rgba(243,241,230,.75)}
.dotlist{list-style:none;padding:0;display:grid;gap:10px}
.dotlist li{padding-left:1.3rem;position:relative}
.dotlist li::before{content:"";position:absolute;left:0;top:.68em;width:.5rem;height:.5rem;border-radius:2px;background:var(--accent)}
.sample .dotlist li::before{background:var(--chalk)}
.who{margin-top:30px}