/* Boğaziçi University corporate identity (2020 guide): navy #1e4a8b, Bosphorus blue #8cc8ea */
:root{
 --navy:#1e4a8b;
 --bosphorus:#8cc8ea;
 --bg:#0b1830;
 --panel:#12263f;
 --line:#2a4570;
 --muted:#a9c0db;
 --text:#f4f8fc;
 --accent:var(--bosphorus);
 --accent-ink:#0b1f33;
 --blue:var(--bosphorus);
 --bad:#ffb4a8;
}
*{box-sizing:border-box}
body{margin:0;background:radial-gradient(1200px 500px at 10% -10%,#1a3a6e 0%,var(--bg) 55%);color:var(--text);font:16px/1.6 'Times New Roman',Times,serif;min-height:100vh}
button,input,select,textarea{font:inherit}
button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}
button{cursor:pointer;border:1px solid var(--line);border-radius:9px;padding:11px 17px;background:#183456;color:var(--text);font-weight:600;transition:background .15s,border-color .15s}
button:hover:not(:disabled){background:#214572}
button:disabled{opacity:.45;cursor:not-allowed}
button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid var(--bosphorus);outline-offset:4px}
.primary{background:var(--bosphorus);color:var(--accent-ink);border-color:var(--bosphorus)}
.primary:hover:not(:disabled){background:#a7d7f1}
.quiet{background:transparent}
.danger{color:var(--bad)}
header{max-width:1240px;margin:auto;padding:18px 28px;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20;background:rgba(11,24,48,.94);backdrop-filter:blur(8px)}
header a{color:var(--text);text-decoration:none;font-family:'Times New Roman',Times,serif;font-weight:700;letter-spacing:0}
#brand{display:flex;align-items:center;gap:13px}
.brand-wrap{display:flex;align-items:center;gap:13px;flex-wrap:wrap;min-width:0}
.logo{display:block;width:48px;height:48px;flex:0 0 auto;padding:0;overflow:hidden;border-radius:12px;background:transparent;border:none;line-height:0}
.logo img{display:block;width:100%;height:100%}
.brand-text{display:flex;flex-direction:column;gap:2px;min-width:0}
.brand-line{display:block;line-height:1.2;letter-spacing:.2px}
.brand-course{font-size:12px;font-weight:600;color:var(--muted);white-space:nowrap}
.brand-people{display:flex;flex-direction:column;align-items:flex-start;gap:4px;align-self:center;margin-left:2px;max-width:min(440px,72vw)}
.brand-instructor{display:block;font-size:12px;font-weight:600;color:var(--muted);font-family:'Times New Roman',Times,serif;line-height:1.35}
.brand-instructor a{color:var(--muted);text-decoration:none;font:inherit;font-weight:600}
.brand-instructor a:hover{color:var(--bosphorus);text-decoration:underline}
.brand-ta-block{display:flex;flex-direction:column;gap:1px;font-size:12px;font-weight:600;font-family:'Times New Roman',Times,serif;line-height:1.35;color:var(--muted)}
.brand-ta-label{color:var(--muted)}
a.brand-ta{display:inline;color:var(--bosphorus);text-decoration:none;font:inherit;font-weight:600}
a.brand-ta:hover{text-decoration:underline}
a.brand-mail{color:var(--bosphorus);text-decoration:none;font:inherit;font-weight:600;word-break:break-all}
a.brand-mail:hover{text-decoration:underline}
header small{display:block;font:11px/1.45 'Times New Roman',Times,serif;color:var(--muted);letter-spacing:.4px;text-transform:none;max-width:280px;white-space:normal}
.header-nav{display:flex;gap:6px;flex-wrap:wrap}
.nav-tab[aria-pressed="true"]{border-color:var(--bosphorus);background:#1a3d66;color:var(--bosphorus)}
.header-actions{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-left:auto}
.header-actions button{white-space:nowrap}
#adminBtn{background:transparent;border:1px solid var(--line);color:var(--muted);font-weight:600;letter-spacing:0;min-height:36px;padding:8px 12px;font-size:13px}
#adminBtn:hover{background:#183456;color:var(--text);border-color:var(--bosphorus)}
#adminBtn.admin-on,#adminBtn[aria-pressed="true"]{background:var(--navy);color:#fff;border-color:var(--bosphorus)}
main{max-width:1172px;margin:0 auto;padding:38px 28px 60px}
h1,h2,h3{font-family:'Times New Roman',Times,serif;line-height:1.15}
h1{font-size:clamp(34px,5vw,60px);letter-spacing:-0.5px;margin:12px 0 18px}
h2{font-size:28px;margin:12px 0 18px}
h3{font-size:20px}
p{margin:0 0 16px}
.eyebrow{font-size:12px;letter-spacing:2px;text-transform:uppercase;font-weight:700;color:var(--bosphorus)}
.muted{color:var(--muted)}
.intro{display:grid;grid-template-columns:1.2fr 1fr;gap:48px;align-items:start;padding:8px 0 28px}
.intro p{max-width:520px;font-size:17px}
.accent{color:var(--bosphorus)}
.setup{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:24px;position:relative}
.setup:before{content:'';display:block;width:55px;height:4px;background:var(--bosphorus);margin-bottom:18px}
.setup label{display:block;margin:16px 0 7px;font-size:14px;font-weight:600}
.mode-buttons{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.mode-buttons button{padding:14px 8px;line-height:1.4}
.mode-buttons button small{display:block;color:var(--muted);font-weight:400;font-size:13px;margin-top:6px}
.mode-buttons .selected{border-color:var(--bosphorus);background:#1a3d66}
.setup input,select,textarea,.edit-form input,.edit-form textarea,dialog input{background:#0b1830;color:var(--text);border:1px solid #3d5f8f;border-radius:8px;padding:12px;width:100%}
.setup .primary{margin-top:18px;width:100%}
.rooms{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.room-card{border-top:1px solid var(--line);padding:16px 10px 0 0}
.room-number{font-family:'Times New Roman',Times;font-size:28px;color:#6f8eb5}
.room-card h3{font-size:17px;margin:8px 0}
.topline{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:18px}
.score{font-family:'Times New Roman',Times;font-size:26px;color:var(--bosphorus);white-space:nowrap}
.score small{font-family:'Times New Roman',Times,serif;font-size:13px;color:var(--muted)}
.progress{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-bottom:24px}
.progress div{border-top:4px solid var(--line);padding-top:9px;color:var(--muted);font-size:13px}
.progress .active{border-color:var(--bosphorus);color:var(--bosphorus)}
.progress .done{border-color:#5aa0d4}
.play-grid{display:grid;grid-template-columns:1fr 240px;gap:26px}
.case{background:var(--panel);border:1px solid var(--line);padding:28px;border-radius:16px}
.case h2{font-size:30px}
.data{background:#0a1628;border:1px solid #355784;border-left:3px solid var(--bosphorus);border-radius:8px;padding:20px;margin:18px 0;font-family:'Times New Roman',Times,serif;font-size:24px;line-height:1.65;white-space:pre-line}
.question{font-size:18px}
.options{display:grid;gap:10px}
.option{text-align:left;display:flex;gap:13px;align-items:center;background:#153154;font-weight:400;width:100%}
.option .key{font-size:13px;border:1px solid #4a6d9a;min-width:27px;height:27px;display:grid;place-items:center;border-radius:5px;color:var(--muted)}
.option.selected{border-color:var(--bosphorus);background:#1c426c}
.option.selected .key{background:var(--bosphorus);color:var(--accent-ink);border-color:var(--bosphorus)}
.fields{display:grid;gap:13px}
.field-row{display:grid;grid-template-columns:1fr 1.25fr;gap:16px;align-items:center}
.reason{margin-top:22px;padding-top:20px;border-top:1px solid var(--line)}
.reason h3{margin-top:0}
.case-actions{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-top:22px;align-items:center}
.action-group{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.hint{border-left:3px solid var(--bosphorus);padding:10px 15px;margin-top:16px;background:#173556;font-size:15px}
.sidebar{padding:5px 0}
.sidebar p{font-size:14px;color:var(--muted)}
.dots{display:flex;gap:8px;margin:12px 0 18px}
.dots span{display:grid;place-items:center;width:38px;height:38px;border:1px solid var(--line);border-radius:50%;color:var(--muted)}
.dots .done{background:var(--bosphorus);color:var(--accent-ink);border-color:var(--bosphorus)}
.dots .current{border-color:var(--bosphorus);color:var(--bosphorus)}
.feedback{background:#143552;border:1px solid #4f8fbf;border-radius:12px;padding:22px;margin-top:22px}
.feedback h3{margin-top:0}
.source{font-size:13px;color:var(--muted)}
.correct-answer{color:var(--bosphorus)}
.results{max-width:880px;margin:auto}
.result-score{font:700 72px/1.1 'Times New Roman',Times;color:var(--bosphorus);margin:20px 0}
.result-score small{font-size:22px;color:var(--muted)}
.result-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:24px 0}
.result-grid div{padding:16px;background:var(--panel);border-radius:10px;border:1px solid var(--line)}
.result-grid strong{display:block;font-size:24px;color:var(--bosphorus)}
details{border:1px solid var(--line);border-radius:10px;padding:16px;margin:14px 0;background:var(--panel)}
summary{cursor:pointer;font-weight:600}
details p{margin-top:14px}
dialog{max-width:750px;width:calc(100% - 32px);max-height:88vh;background:var(--panel);color:var(--text);border:1px solid var(--line);border-radius:16px;padding:28px}
dialog::backdrop{background:#000b}
.dialog-head{display:flex;align-items:center;justify-content:space-between;gap:15px}
.dialog-head h2{font-size:26px;margin:0}
.guide-body p{font-size:15px;color:#d5e4f4}
.storage-warning{color:var(--bad);font-size:14px}
.break-panel{max-width:720px;margin:30px auto;text-align:center}
.break-panel .seal{display:grid;place-items:center;width:90px;height:90px;margin:24px auto;border:2px solid var(--bosphorus);border-radius:50%;font-size:38px;color:var(--bosphorus)}
.wide-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:18px}
.week-picker{margin:0 0 24px}
.week-picker h2{font-size:20px;margin:0 0 12px}
.week-options{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:10px}
.week-options button{text-align:left;padding:12px;font-size:14px}
.week-options small{display:block;font-size:12px;font-weight:400;color:var(--muted);margin-top:4px}
.week-options .selected{border-color:var(--bosphorus);background:#1a3d66}
.week-options .selected small{color:var(--bosphorus)}
.week-empty{border:1px solid var(--line);border-radius:16px;background:var(--panel);padding:36px 28px}
.week-empty h1{font-size:36px;letter-spacing:-1px}
.week-empty p{color:var(--muted);font-size:18px}
.library-head{display:flex;justify-content:space-between;gap:16px;align-items:end;flex-wrap:wrap;margin-bottom:8px}
.library-head h1{font-size:clamp(28px,4vw,44px);margin-bottom:0}
.library-note{color:var(--bosphorus)}
.q-card{padding:8px 16px}
.q-card summary .correct-answer{display:block;font-weight:500;margin-top:6px}
.q-card .data{font-size:18px;padding:14px}
.edited-pill{margin-left:8px;color:var(--bosphorus);font-size:12px;letter-spacing:1px;font-weight:700}
.edit-form textarea{min-height:88px;resize:vertical}
.edit-form label,dialog label{display:block;font-size:14px;font-weight:600;margin:14px 0 6px}
.edit-form .edit-mark{font-weight:500;font-size:13px;margin:0}
.edit-row{display:grid;grid-template-columns:108px minmax(0,1fr);gap:8px;align-items:center;margin-top:8px}
.edit-actions{display:flex;flex-wrap:wrap;gap:10px;margin:16px 0}
.edit-form fieldset{border:1px solid var(--line);border-radius:10px;margin:12px 0;padding:4px 12px 12px}
dialog form p{font-size:15px;color:#d5e4f4}
@media(max-width:1235px){main{padding:28px 28px 50px}}
@media(max-width:1000px){.week-options{grid-template-columns:repeat(4,minmax(0,1fr))}}
@media(max-width:850px){.intro{gap:24px;grid-template-columns:1fr}.play-grid{grid-template-columns:1fr}.sidebar{display:none}h1{font-size:40px}}
@media(max-width:620px){
 header{padding:14px 14px}
 header a{font-size:13px}
 .logo{width:36px;height:36px}
 .header-actions{width:100%;justify-content:flex-start;gap:6px}
 .header-actions button{font-size:13px;padding:9px 12px}
 #adminBtn{border-width:2px;font-size:13px;padding:9px 14px}
 main{padding:20px 14px 40px}
 .rooms{grid-template-columns:repeat(2,1fr)}
 .field-row{grid-template-columns:1fr;gap:5px}
 .data{font-size:20px;padding:14px}
 .progress div{font-size:11px}
 .result-grid{grid-template-columns:repeat(2,1fr)}
 .week-options{grid-template-columns:repeat(2,minmax(0,1fr))}
 .edit-row{grid-template-columns:1fr}
 .library-head{align-items:start}
}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
@media print{header,.wide-actions,.case-actions{display:none}body{background:white;color:black}.results{max-width:none}.result-score,.result-grid strong{color:black}details{break-inside:avoid;background:white}details>*{display:block}}

.office{max-width:720px;margin:0 auto}
.office h1{font-size:clamp(28px,4vw,44px);margin:8px 0 28px}
.office-layout{display:grid;gap:28px}
.office-layout:has(.admin-panel){grid-template-columns:1fr 1fr;max-width:1100px;margin:0 auto}
.book-panel,.office-card{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:28px}
.office-card h2{font-size:20px;margin:0 0 14px}
.book-kind{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:22px}
.book-kind button{min-height:52px;font-size:17px}
.book-kind button.selected,.book-kind button[aria-pressed="true"]{border-color:var(--bosphorus);background:#1a3d66;color:var(--bosphorus)}
.book-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:16px}
.book-field{display:flex;flex-direction:column;gap:7px;min-width:0}
.book-field label,.book-label{font-size:14px;font-weight:600;color:var(--muted)}
.book-field input,.book-field textarea,.office-card input:not([type="checkbox"]),.office-card textarea{background:#0b1830;color:var(--text);border:1px solid #3d5f8f;border-radius:8px;padding:12px;width:100%;color-scheme:dark}
.book-field input::placeholder,.book-field textarea::placeholder,.office-card input::placeholder,.office-card textarea::placeholder{color:#8aa4c4}
.book-members{margin-bottom:16px}
.book-block{margin:22px 0}
.day-tabs{display:flex;flex-wrap:nowrap;gap:8px;margin-top:10px}
.day-tabs button{flex:1;min-width:0;padding:12px 6px;font-size:15px}
.day-tabs button.selected{border-color:var(--bosphorus);background:#1a3d66;color:var(--bosphorus)}
.day-tabs button:disabled{opacity:.3}
.slot-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(88px,1fr));gap:10px;margin-top:10px}
.slot-grid button{padding:12px 8px;font-size:15px}
.slot-grid button.selected{border-color:var(--bosphorus);background:#1a3d66;color:var(--bosphorus)}
.slot-grid button.taken,.slot-grid button:disabled{opacity:.32;text-decoration:line-through}
.book-submit{width:100%;margin-top:8px;min-height:52px;font-size:17px}
.book-status{font-size:14px;color:var(--muted);margin:14px 0 0;min-height:1.4em}
.booking-list{display:grid;gap:10px}
.booking-item{border:1px solid var(--line);border-radius:10px;padding:14px;background:#0f2138}
.booking-item .status{font-size:12px;letter-spacing:1px;text-transform:uppercase;font-weight:700;color:var(--bosphorus)}
.booking-item .status.declined{color:var(--bad)}
.booking-item .status.approved{color:#9fe0a8}
.avail-row{display:grid;grid-template-columns:90px 70px 1fr 1fr;gap:8px;align-items:center;margin-bottom:10px}
.avail-row input[type="time"]{padding:8px}
.mailto-note{font-size:14px;color:var(--muted);margin-top:10px}
.reject-field{margin:12px 0 4px}
.reject-field input{background:#0b1830;color:var(--text);border:1px solid #3d5f8f;border-radius:8px;padding:12px;width:100%;color-scheme:dark}
@media(max-width:900px){.office-layout:has(.admin-panel){grid-template-columns:1fr}.avail-row{grid-template-columns:1fr 1fr}.header-nav{width:100%}}
@media(max-width:620px){
 .book-row{grid-template-columns:1fr}
 .day-tabs{flex-wrap:wrap}
 .day-tabs button{flex:1 1 calc(33.33% - 8px)}
 .brand-course{font-size:11px;letter-spacing:0}
}

.landing{max-width:min(960px,100%);margin:36px auto 20px;text-align:center;padding:0 8px}
.site-title{display:flex;flex-direction:column;align-items:center;gap:.18em;margin:0 0 8px;line-height:1.12}
.site-title .title-line{display:block;font-size:clamp(22px,3.4vw,34px);font-weight:700;letter-spacing:0;color:var(--muted)}
.site-title .title-course{font-size:clamp(20px,4.1vw,52px);font-weight:700;color:var(--text);letter-spacing:0;white-space:nowrap;max-width:100%}
.site-title .course-keep,.site-title .course-tail{white-space:nowrap}
.site-title .title-instructor{font-size:clamp(18px,2.6vw,28px);font-weight:600;color:var(--muted);margin-top:.2em}
.site-title .title-ta{font-size:clamp(18px,2.6vw,28px);font-weight:600;color:var(--bosphorus);margin-top:.08em}
.site-title .title-ta a{color:var(--bosphorus);text-decoration:none;font:inherit}
.site-title .title-ta a:hover{text-decoration:underline}
.office-place{display:block;margin-top:.45em;color:var(--muted);font-size:clamp(16px,2vw,20px);font-weight:400;line-height:1.45;letter-spacing:0}
.office>.office-place{margin:0 0 22px;text-align:left}
.landing-tabs{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:34px}
.landing-tabs button{min-height:120px;padding:28px 22px;font-size:clamp(20px,2.6vw,28px);font-weight:700;line-height:1.25;border-width:2px;background:var(--panel)}
.landing-tabs button:hover{border-color:var(--bosphorus);background:#1a3d66}
.home-nav{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 22px}
.home-nav button[aria-pressed="true"]{border-color:var(--bosphorus);background:#1a3d66;color:var(--bosphorus)}
@media(max-width:620px){
 .landing-tabs{grid-template-columns:1fr}
 .landing-tabs button{min-height:96px;font-size:22px}
 .site-title .title-course{font-size:clamp(16px,5.2vw,28px)}
}
@media(max-width:360px){
 .site-title .title-course{white-space:normal}
 .site-title .course-keep{display:inline}
 .site-title .course-tail{display:inline-block}
}

.ps-intro{display:grid;gap:28px;max-width:960px;margin:0 auto}
.material-picker .material-choices{display:grid;grid-template-columns:1fr;gap:12px}
.material-picker .material-choices button{min-height:72px;text-align:left;padding:18px 20px;font-size:20px;font-weight:700}
.material-picker .material-choices button small{display:block;margin-top:6px;font-size:14px;font-weight:500;color:var(--muted)}
.material-view{max-width:1100px;margin:0 auto}
.material-head{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-bottom:16px}
.material-head h1{margin:0;font-size:clamp(24px,3vw,36px)}
.embed-toolbar{display:flex;gap:10px;margin-bottom:12px}
.material-frame{width:100%;border:1px solid var(--line);border-radius:12px;background:#0b1830}
.pdf-frame{min-height:min(78vh,820px);height:78vh}
.game-frame{min-height:min(85vh,900px);height:85vh}
.week-empty{max-width:720px;margin:12px auto 40px;text-align:center}
.week-empty h1{margin:8px 0 12px}
.week-empty .muted{margin-top:18px;font-size:18px}
.week-line{font-size:15px;color:var(--muted);margin:0 0 14px}
.day-tabs button{font-size:13px;line-height:1.25;padding:10px 6px}
@media(max-width:620px){.brand-people{max-width:100%;width:100%}}

.class-meetings{list-style:none;margin:0 0 14px;padding:0;color:var(--bosphorus);font-weight:700;font-size:15px;line-height:1.55}
.class-meetings li{margin:0 0 4px}
.week-empty .class-meetings{text-align:left;max-width:520px;margin-left:auto;margin-right:auto}
.intro .class-meetings{margin-top:4px}

/* Course assistant chat (floating; does not restyle home/header) */
.ling101-chat{position:fixed;right:18px;bottom:18px;z-index:40;font-family:'Times New Roman',Times,serif}
.ling101-chat-toggle{background:var(--navy);color:#fff;border:1px solid var(--bosphorus);border-radius:999px;padding:12px 18px;font-size:14px;font-weight:700;box-shadow:0 8px 24px rgba(0,0,0,.35)}
.ling101-chat-toggle:hover:not(:disabled){background:#2457a0;border-color:var(--bosphorus)}
.ling101-chat-panel{position:absolute;right:0;bottom:56px;width:min(360px,calc(100vw - 28px));height:min(460px,70vh);display:flex;flex-direction:column;background:var(--panel);border:1px solid var(--line);border-radius:16px;box-shadow:0 16px 40px rgba(0,0,0,.45);overflow:hidden}
.ling101-chat-panel[hidden]{display:none!important}
.ling101-chat-header{display:flex;align-items:flex-start;justify-content:space-between;gap:10px;padding:14px 14px 12px;border-bottom:1px solid var(--line);background:#153154}
.ling101-chat-header h2{margin:0;font-size:16px;line-height:1.25;font-weight:700}
.ling101-chat-close{flex:0 0 auto;width:34px;height:34px;padding:0;border-radius:8px;background:transparent;border:1px solid var(--line);color:var(--muted);font-size:22px;line-height:1;font-weight:400}
.ling101-chat-close:hover:not(:disabled){background:#183456;color:var(--text);border-color:var(--bosphorus)}
.ling101-chat-transcript{flex:1;overflow-y:auto;padding:12px;display:flex;flex-direction:column;gap:8px;background:var(--bg)}
.ling101-chat-msg{max-width:92%;padding:9px 12px;border-radius:10px;font-size:14px;line-height:1.45;white-space:pre-wrap;word-break:break-word}
.ling101-chat-msg--user{align-self:flex-end;background:#1a3d66;border:1px solid #3d5f8f;color:var(--text)}
.ling101-chat-msg--assistant{align-self:flex-start;background:#12263f;border:1px solid var(--line);color:var(--muted)}
.ling101-chat-form{display:flex;gap:8px;padding:10px;border-top:1px solid var(--line);background:#153154}
.ling101-chat-input{flex:1;min-width:0;background:#0b1830;color:var(--text);border:1px solid #3d5f8f;border-radius:8px;padding:10px 12px;color-scheme:dark}
.ling101-chat-input::placeholder{color:#8aa4c4}
.ling101-chat-send{flex:0 0 auto;padding:10px 14px;font-size:14px}
@media(max-width:480px){
 .ling101-chat{right:10px;bottom:10px;left:10px}
 .ling101-chat-toggle{width:100%}
 .ling101-chat-panel{left:0;right:0;width:auto;bottom:54px;height:min(520px,72vh)}
}