/* How to Communicate with AI — styles for per-lesson pages + dashboard */
:root {
  --bg: #f3f8f4;
  --panel: #ffffff;
  --ink: #16241c;
  --muted: #5c6b61;
  --line: #dde8e0;
  --brand: #1f8a5b;          /* green */
  --brand-dark: #156a45;
  --brand-soft: #e7f5ec;
  --accent: #0f9d78;
  --warn: #b4530f;
  --warn-soft: #fbeee2;
  --teacher: #6d31c4;
  --teacher-soft: #f1eaff;
  /* light-green "script" boxes with black text (replaces the old dark boxes) */
  --script-bg: #e4f5ea;
  --script-ink: #12281c;
  --script-line: #b7e2c6;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(20,40,30,.05), 0 8px 24px rgba(20,40,30,.07);
  --maxw: 820px;
}
/* dark theme values. Script boxes stay light green with black text on purpose. */
:root[data-theme="dark"] {
  --bg: #0f1712; --panel: #16211a; --ink: #e7f0ea; --muted: #9bb0a3;
  --line: #26332b; --brand: #43b581; --brand-dark: #6fd3a3; --brand-soft: #17281f;
  --accent: #35c79a; --warn: #eb955f; --warn-soft: #2a1c12;
  --teacher: #b58cff; --teacher-soft: #221733;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 10px 30px rgba(0,0,0,.35);
}
/* follow the system setting only when the user hasn't picked a theme */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --bg: #0f1712; --panel: #16211a; --ink: #e7f0ea; --muted: #9bb0a3;
    --line: #26332b; --brand: #43b581; --brand-dark: #6fd3a3; --brand-soft: #17281f;
    --accent: #35c79a; --warn: #eb955f; --warn-soft: #2a1c12;
    --teacher: #b58cff; --teacher-soft: #221733;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 10px 30px rgba(0,0,0,.35);
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--brand-dark); text-decoration: none; }
a:hover { text-decoration: underline; }
code, .mono { font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace; }

/* ---------- top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  padding: 11px 20px; background: color-mix(in srgb, var(--panel) 90%, transparent);
  backdrop-filter: saturate(150%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.topbar .brand { font-weight: 700; letter-spacing: -.2px; }
.topbar .brand small { display:block; font-weight: 500; color: var(--muted); font-size: 12px; }
.edition-badge {
  font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .5px;
  padding: 4px 10px; border-radius: 999px; background: var(--brand-soft); color: var(--brand-dark);
}
.edition-badge.teacher { background: var(--teacher-soft); color: var(--teacher); }
.topbar .spacer { flex: 1; }
.topbar .lnk { font-size: 13px; padding: 6px 12px; border: 1px solid var(--line);
  border-radius: 999px; color: var(--muted); white-space: nowrap; }
.topbar .lnk:hover { border-color: var(--brand); color: var(--brand-dark); text-decoration: none; }
.topbar .lnk[aria-disabled="true"] { opacity: .4; pointer-events: none; }

/* ---------- generic page column ---------- */
.page { max-width: var(--maxw); margin: 0 auto; padding: 28px 22px 100px; }

/* ---------- lesson card ---------- */
.lesson { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 30px 34px; }
.lesson .lvl { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .5px; color: var(--brand-dark); }
.lesson h1 { margin: 6px 0 4px; font-size: 27px; line-height: 1.22; letter-spacing: -.3px; }
.lesson h1 .num { color: var(--muted); font-weight: 700; }
.objective { display: flex; gap: 10px; align-items: flex-start; margin: 14px 0 20px;
  padding: 12px 14px; background: var(--brand-soft); border-radius: 10px; font-size: 15px; }
.objective b { color: var(--brand-dark); }
.lesson h2 { font-size: 13px; text-transform: uppercase; letter-spacing: .6px; color: var(--muted); margin: 26px 0 8px; }
.lesson p { margin: 0 0 12px; }

/* script / prompt boxes — LIGHT GREEN bg, BLACK text */
.script-box { background: var(--script-bg); color: var(--script-ink);
  border: 1px solid var(--script-line); border-radius: 10px;
  padding: 14px 44px 14px 16px; position: relative; overflow-x: auto; }
.script-box pre { margin: 0; white-space: pre-wrap; word-break: break-word;
  font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace; font-size: 13.5px; line-height: 1.6;
  color: var(--script-ink); }
.copy-btn { position: absolute; top: 8px; right: 8px; font-size: 11px; padding: 3px 9px;
  border-radius: 6px; border: 1px solid var(--script-line); background: rgba(255,255,255,.6);
  color: var(--script-ink); cursor: pointer; }
.copy-btn:hover { background: #fff; }
.copy-btn.done { color: var(--brand-dark); border-color: var(--brand); }

.example { border: 1px solid var(--line); border-radius: 12px; overflow: hidden; margin-top: 6px; }
.example .row { padding: 12px 16px; border-bottom: 1px solid var(--line); }
.example .row:last-child { border-bottom: 0; }
.example .tag { font-size: 11px; font-weight: 700; letter-spacing: .5px; text-transform: uppercase;
  display: inline-block; padding: 2px 8px; border-radius: 6px; margin-bottom: 8px; }
.example .you .tag { background: var(--brand-soft); color: var(--brand-dark); }
.example .ai .tag { background: #eef2f7; color: #3a5063; }
.example .why .tag { background: var(--warn-soft); color: var(--warn); }
.example .ai pre.msg, .example .ai .msg { margin: 0; white-space: pre-wrap; word-break: break-word;
  font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace; font-size: 13px; color: var(--ink); }
.example .why div { color: var(--ink); }

ul.clean { margin: 4px 0 0; padding-left: 20px; }
ul.clean li { margin: 5px 0; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.mini { border: 1px solid var(--line); border-radius: 10px; padding: 12px 16px; }
.mini.tips { border-left: 3px solid var(--accent); }
.mini.mistakes { border-left: 3px solid var(--warn); }
.mini h2 { margin-top: 0; }
.exercise-box { background: var(--brand-soft); border-radius: 10px; padding: 12px 16px; }

/* teacher panel (teacher lesson files only) */
.teacher-panel { margin-top: 22px; border: 1px dashed var(--teacher); background: var(--teacher-soft);
  border-radius: 12px; padding: 16px 18px; }
.teacher-panel .th { display:flex; align-items:center; gap:8px; font-weight:700; color: var(--teacher);
  text-transform: uppercase; font-size: 12px; letter-spacing: .6px; margin-bottom: 8px; }
.teacher-panel .duration { margin-left:auto; background: var(--panel); border:1px solid var(--line);
  padding: 2px 8px; border-radius: 999px; font-size: 12px; color: var(--muted); letter-spacing: 0; text-transform: none; }
.teacher-panel h3 { margin: 12px 0 4px; font-size: 12px; letter-spacing: .4px; text-transform: uppercase; color: var(--muted); }

/* ---------- practice studio (student lessons) ---------- */
.studio { margin-top: 26px; border: 2px solid var(--brand); border-radius: 14px;
  background: var(--brand-soft); padding: 20px 22px; }
.studio h2 { color: var(--brand-dark); font-size: 16px; text-transform: none; letter-spacing: 0; margin: 0 0 4px; }
.studio .hint { color: var(--muted); font-size: 14px; margin: 0 0 14px; }
.studio label { display:block; font-weight: 700; font-size: 13px; margin: 12px 0 5px; color: var(--ink); }
.studio textarea { width: 100%; border: 1px solid var(--script-line); border-radius: 10px;
  background: #fff; color: #12281c; padding: 11px 13px; font: inherit; font-size: 14.5px; line-height: 1.5;
  resize: vertical; min-height: 84px; }
.studio textarea.q { min-height: 76px; }
.studio textarea.a { min-height: 120px; }
.studio textarea:focus { outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px rgba(31,138,91,.15); }
.studio-actions { display:flex; align-items:center; gap: 10px; margin-top: 14px; flex-wrap: wrap; }
.btn { display:inline-block; text-align:center; padding: 9px 16px; border-radius: 10px; border: 0;
  background: var(--brand); color:#fff; font-weight: 600; font-size: 14px; cursor: pointer; }
.btn:hover { text-decoration: none; filter: brightness(1.05); }
.btn.ghost { background: transparent; color: var(--brand-dark); border:1px solid var(--brand); }
.btn.small { padding: 6px 12px; font-size: 13px; }
.save-status { font-size: 13px; color: var(--brand-dark); }

/* mark-done control */
.done-bar { display:flex; align-items:center; gap: 12px; margin-top: 22px; padding-top: 18px;
  border-top: 1px solid var(--line); flex-wrap: wrap; }
.done-toggle { display:inline-flex; align-items:center; gap: 8px; padding: 9px 16px; border-radius: 10px;
  border: 1px solid var(--brand); background: #fff; color: var(--brand-dark); font-weight: 600; cursor: pointer; font-size: 14px; }
.done-toggle .box { width: 18px; height: 18px; border-radius: 5px; border: 2px solid var(--brand);
  display:inline-flex; align-items:center; justify-content:center; font-size: 12px; color:#fff; }
body.is-done .done-toggle { background: var(--brand); color: #fff; }
body.is-done .done-toggle .box { background: #fff; color: var(--brand-dark); border-color:#fff; }
.done-toggle .box::after { content: ""; }
body.is-done .done-toggle .box::after { content: "\2713"; }

/* prev / next footer nav */
.lesson-nav { display:flex; justify-content: space-between; gap: 12px; margin-top: 26px; }
.lesson-nav a { flex: 1; border: 1px solid var(--line); border-radius: 12px; padding: 12px 16px;
  background: var(--panel); box-shadow: var(--shadow); }
.lesson-nav a:hover { border-color: var(--brand); text-decoration: none; }
.lesson-nav a.next { text-align: right; }
.lesson-nav a .dir { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: .5px; }
.lesson-nav a .t { display:block; font-weight: 600; color: var(--ink); margin-top: 2px; }
.lesson-nav .disabled { opacity: .35; pointer-events: none; }

/* ---------- dashboard (index) ---------- */
.hero { text-align:center; padding: 46px 22px 8px; max-width: 820px; margin: 0 auto; }
.hero .kicker { color: var(--brand-dark); font-weight: 700; letter-spacing: .5px; text-transform: uppercase; font-size: 13px; }
.hero h1 { font-size: 40px; line-height: 1.1; letter-spacing: -1px; margin: 12px 0 10px; }
.hero p.sub { font-size: 18px; color: var(--muted); max-width: 640px; margin: 0 auto; }

/* theme toggle (top bar) */
.theme-toggle { display:inline-flex; border:1px solid var(--line); border-radius:999px; overflow:hidden; }
.theme-toggle button { border:0; background:transparent; color:var(--muted); font:inherit; font-size:12.5px;
  font-weight:600; padding:6px 13px; cursor:pointer; display:inline-flex; align-items:center; gap:5px; }
.theme-toggle button.active { background:var(--brand); color:#fff; }
.theme-toggle button:not(.active):hover { color:var(--brand-dark); }

/* who-chip on lesson pages */
.who-chip { font-size:13px; padding:6px 12px; border:1px solid var(--line); border-radius:999px;
  color:var(--brand-dark); background:var(--brand-soft); white-space:nowrap; }
.who-chip:hover { border-color:var(--brand); text-decoration:none; }

/* student area (dashboard) */
.student-card, #studentArea { max-width: 820px; margin: 22px auto 0; }
.student-setup { background: var(--panel); border: 2px solid var(--brand); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 22px 24px; }
.student-setup .ss-title { font-size: 18px; font-weight: 700; color: var(--ink); }
.student-setup .ss-row { display:flex; gap: 10px; margin: 14px 0 8px; flex-wrap: wrap; }
.student-setup input { flex: 1; min-width: 200px; border: 1px solid var(--line); border-radius: 10px;
  padding: 11px 14px; font: inherit; font-size: 15px; background: var(--bg); color: var(--ink); }
.student-setup input:focus { outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px rgba(31,138,91,.15); }
.student-setup .ss-hint { color: var(--muted); font-size: 13px; }
.student-live { display:flex; align-items:center; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 12px 18px; }
.student-live .sl-left { display:flex; align-items:center; gap: 10px; }
.student-live .sl-label { font-size: 13px; color: var(--muted); font-weight: 600; }
.student-live select { border: 1px solid var(--line); border-radius: 9px; padding: 8px 12px; font: inherit;
  font-size: 15px; font-weight: 600; background: var(--bg); color: var(--ink); cursor: pointer; }
.student-live .sl-actions { display:flex; gap: 8px; flex-wrap: wrap; }

.progress-card { max-width: 820px; margin: 14px auto 8px; padding: 20px 24px; background: var(--panel);
  border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.progress-top { display:flex; align-items: baseline; justify-content: space-between; gap: 10px; flex-wrap: wrap; }
.progress-top .pct { font-size: 30px; font-weight: 800; color: var(--brand-dark); letter-spacing: -.5px; }
.progress-top .count { color: var(--muted); font-size: 14px; }
.bar { height: 12px; border-radius: 999px; background: var(--brand-soft); overflow: hidden; margin-top: 12px; border: 1px solid var(--line); }
.bar > span { display:block; height: 100%; width: 0%; background: linear-gradient(90deg, var(--brand), var(--accent));
  transition: width .35s ease; }
.progress-actions { margin-top: 14px; display:flex; gap: 10px; flex-wrap: wrap; }

.section { max-width: 820px; margin: 26px auto; padding: 0 22px; }
.section h2 { font-size: 20px; letter-spacing: -.3px; margin-bottom: 4px; }
.section .part-h { font-size: 11px; text-transform: uppercase; letter-spacing: .6px; color: var(--brand-dark);
  font-weight: 700; margin: 20px 0 8px; }

.lesson-row { display:flex; align-items:center; gap: 14px; padding: 12px 16px; background: var(--panel);
  border: 1px solid var(--line); border-radius: 12px; margin-bottom: 8px; box-shadow: var(--shadow); }
.lesson-row:hover { border-color: var(--brand); }
.lesson-row .rn { width: 30px; height: 30px; flex: 0 0 30px; border-radius: 8px; background: var(--brand-soft);
  color: var(--brand-dark); font-weight: 700; display:flex; align-items:center; justify-content:center; font-size: 14px; }
.lesson-row .body { flex: 1; min-width: 0; }
.lesson-row .body a.title { font-weight: 600; color: var(--ink); }
.lesson-row .body a.title:hover { color: var(--brand-dark); }
.lesson-row .body .goal { font-size: 13px; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lesson-row .tlink { font-size: 12px; color: var(--muted); border:1px solid var(--line); padding: 4px 9px; border-radius: 999px; }
.lesson-row .tlink:hover { border-color: var(--teacher); color: var(--teacher); text-decoration:none; }
.status { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .4px;
  padding: 5px 11px; border-radius: 999px; white-space: nowrap; }
.status.new { background: #eef2f0; color: #7b8a80; }
.status.opened { background: #fff3e0; color: #b4530f; }
.status.done { background: var(--brand-soft); color: var(--brand-dark); }
.status.done::before { content: "\2713 "; }

.footer { text-align:center; color: var(--muted); font-size: 13px; padding: 30px 20px 60px; }
.footer a { color: var(--brand-dark); }

/* site footer (copyright + contact) — on every page */
.site-footer { text-align:center; color: var(--muted); font-size: 13px;
  padding: 26px 20px 44px; margin-top: 30px; border-top: 1px solid var(--line); }
.site-footer .cr { font-weight: 600; color: var(--ink); }
.site-footer .contact { margin-top: 4px; }
.site-footer a { color: var(--brand-dark); font-weight: 600; }

/* mobile */
@media (max-width: 720px) {
  .lesson { padding: 22px 18px; }
  .two-col { grid-template-columns: 1fr; }
  .hero h1 { font-size: 30px; }
  .lesson-nav { flex-direction: column; }
}