/* Young Developer Hub demo — presented as its own standalone application,
   styled on-brand with the OBL palette. */
.ydh {
  --ydh-green: #14342B;
  --ydh-green2: #1b4638;
  --ydh-terra: #A6432E;
  --ydh-ivy: #3B6E58;
  --ydh-sage: #E4ECE6;
  --ydh-ink: #1c2b26;
  --ydh-body: #4a5751;
  --ydh-line: #dfe6e1;
  --ydh-card: #ffffff;
  --ydh-paper: #f4f7f4;
  --ydh-gold: #d98a2b;
}
.ydh { color: var(--ydh-ink); }
.ydh__intro { max-width: 66ch; }

.ydh-badge {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 600; color: var(--ydh-terra);
  background: #fbeee9; border: 1px solid #f0d5cc; border-radius: 999px; padding: 6px 14px;
}
.ydh-note {
  border: 1px solid var(--ydh-line); border-left: 4px solid var(--ydh-ivy);
  background: var(--ydh-paper); border-radius: 10px; padding: 14px 18px;
  font-size: 14px; line-height: 1.6; color: var(--ydh-body);
}

/* ---- standalone app window ---- */
.ydh-window {
  border-radius: 16px; overflow: hidden;
  box-shadow: 0 24px 60px -24px rgba(15, 40, 31, .45), 0 6px 18px -8px rgba(15, 40, 31, .25);
  border: 1px solid var(--ydh-line); background: var(--ydh-card);
}
.ydh-chrome {
  display: flex; align-items: center; gap: 7px;
  padding: 10px 16px; background: #0f281f;
}
.ydh-chrome__dot { width: 11px; height: 11px; border-radius: 50%; background: #3a5a4d; }
.ydh-chrome__dot:nth-child(1) { background: #e5734f; }
.ydh-chrome__dot:nth-child(2) { background: #e0b23c; }
.ydh-chrome__dot:nth-child(3) { background: #5aa87a; }
.ydh-chrome__url {
  margin-left: 14px; font-size: 12px; color: #9fc0b1;
  background: #163a2d; padding: 4px 14px; border-radius: 999px; letter-spacing: .01em;
}

.ydh-app { background: var(--ydh-card); }
.ydh-appbar {
  display: flex; align-items: center; gap: 12px; padding: 16px 22px;
  background: linear-gradient(120deg, var(--ydh-green) 0%, var(--ydh-green2) 100%); color: #fff;
}
.ydh-logo {
  display: inline-flex; align-items: center; justify-content: center;
  width: 30px; height: 30px; border-radius: 9px; flex: none;
  background: var(--ydh-terra); color: #fff; font-size: 13px; transform: rotate(0deg);
}
.ydh-appbar__name { font-weight: 800; font-size: 18px; letter-spacing: -.01em; }
.ydh-appbar__name span { color: #8fc9ad; font-weight: 800; }
.ydh-appbar__tag { margin-left: auto; font-size: 12px; color: #b9d4c8; letter-spacing: .04em; text-transform: lowercase; }

/* tabs */
.ydh-tabs { display: flex; gap: 4px; padding: 10px 14px 0; border-bottom: 1px solid var(--ydh-line); background: var(--ydh-paper); flex-wrap: wrap; }
.ydh-tab {
  appearance: none; border: 1px solid transparent; border-bottom: none; background: transparent;
  padding: 11px 18px; font: inherit; font-size: 14px; font-weight: 600; color: var(--ydh-body);
  border-radius: 9px 9px 0 0; cursor: pointer;
}
.ydh-tab:hover { color: var(--ydh-green); }
.ydh-tab[aria-selected="true"] { background: var(--ydh-card); color: var(--ydh-green); border-color: var(--ydh-line); position: relative; }
.ydh-tab[aria-selected="true"]::after { content: ""; position: absolute; left: 0; right: 0; bottom: -1px; height: 2px; background: var(--ydh-terra); }
.ydh-panel { padding: 24px; }
.ydh-panel[hidden] { display: none; }

.ydh-h3 { font-size: 15px; font-weight: 700; color: var(--ydh-green); margin: 0 0 12px; }
.ydh-muted { color: var(--ydh-body); font-size: 14px; }

/* learn toolbar */
.ydh-toolbar { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; margin-bottom: 8px; }
.ydh-filters { display: flex; flex-wrap: wrap; gap: 8px; }
.ydh-chip {
  appearance: none; border: 1px solid var(--ydh-line); background: #fff; color: var(--ydh-body);
  padding: 8px 14px; border-radius: 999px; font: inherit; font-size: 13px; font-weight: 600; cursor: pointer;
}
.ydh-chip:hover { border-color: var(--ydh-ivy); color: var(--ydh-green); }
.ydh-chip[aria-pressed="true"] { background: var(--ydh-green); color: #fff; border-color: var(--ydh-green); }
.ydh-search {
  margin-left: auto; min-width: 200px; border: 1px solid var(--ydh-line); border-radius: 999px;
  padding: 9px 16px; font: inherit; font-size: 14px; background: #fff;
}
.ydh-search:focus-visible { outline: 2px solid var(--ydh-ivy); outline-offset: 1px; }
.ydh-count { font-size: 13px; color: var(--ydh-body); margin: 0 0 16px; }

/* lessons */
.ydh-lessons { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.ydh-lesson { border: 1px solid var(--ydh-line); border-radius: 12px; padding: 16px 18px; background: #fff; display: flex; flex-direction: column; transition: box-shadow .15s, transform .15s; }
.ydh-lesson:hover { box-shadow: 0 10px 24px -14px rgba(15,40,31,.35); transform: translateY(-1px); }
.ydh-lesson.is-done { border-color: #bcd9c9; background: #f5fbf7; }
.ydh-lesson__top { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; flex-wrap: wrap; }
.ydh-meta { font-size: 12px; color: var(--ydh-body); }
.ydh-lesson__title { font-size: 16px; font-weight: 700; margin: 0 0 6px; color: var(--ydh-ink); }
.ydh-check { color: #2f8a5b; }
.ydh-lesson__summary { font-size: 14px; line-height: 1.55; color: var(--ydh-body); margin: 0 0 12px; }
.ydh-lesson__body { font-size: 14px; line-height: 1.65; color: var(--ydh-ink); background: var(--ydh-paper); border-radius: 8px; padding: 14px; margin: 0 0 12px; }
.ydh-lesson__body > p { margin: 0 0 12px; }
.ydh-lesson__actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: auto; align-items: center; }

.ydh-tag { font-size: 12px; font-weight: 600; padding: 4px 10px; border-radius: 6px; white-space: nowrap; }
.ydh-tag--js { background: #fdf1d8; color: #8a6300; }
.ydh-tag--git { background: #e9edfb; color: #3946a5; }
.ydh-tag--a11y { background: #e3f2ea; color: #1f6b45; }
.ydh-tag--team { background: #fbeae6; color: #a6432e; }

/* quiz */
.ydh-quiz { border-top: 1px dashed var(--ydh-line); padding-top: 12px; }
.ydh-quiz__q { font-weight: 700; font-size: 13px; color: var(--ydh-green); margin: 0 0 10px; }
.ydh-quiz__opts { display: flex; flex-direction: column; gap: 8px; }
.ydh-quiz__opt {
  appearance: none; text-align: left; border: 1px solid var(--ydh-line); background: #fff; color: var(--ydh-ink);
  padding: 9px 12px; border-radius: 8px; font: inherit; font-size: 13px; cursor: pointer;
}
.ydh-quiz__opt:hover:not(:disabled) { border-color: var(--ydh-ivy); }
.ydh-quiz__opt.is-correct { background: #e3f5ea; border-color: #6dbf90; color: #1c6b43; font-weight: 600; }
.ydh-quiz__opt.is-wrong { background: #fdece9; border-color: #e2a99c; color: #9a3a28; }
.ydh-quiz__opt:disabled { cursor: default; }
.ydh-quiz__fb { margin: 10px 0 0; font-size: 13px; font-weight: 600; }
.ydh-quiz__fb.is-ok { color: #1c6b43; }
.ydh-quiz__fb.is-no { color: #9a3a28; }

/* buttons */
.ydh-btn { appearance: none; border: 1px solid var(--ydh-green); background: var(--ydh-green); color: #fff; font: inherit; font-weight: 600; border-radius: 8px; padding: 9px 16px; cursor: pointer; }
.ydh-btn:hover { background: #0f281f; }
.ydh-btn:disabled { opacity: .6; cursor: default; }
.ydh-btn--sm { padding: 7px 12px; font-size: 13px; }
.ydh-btn--ghost { background: #fff; color: var(--ydh-green); }
.ydh-btn--ghost:hover { background: var(--ydh-paper); }
.ydh-iconbtn { appearance: none; border: none; background: none; font: inherit; font-size: 13px; font-weight: 600; color: var(--ydh-terra); cursor: pointer; padding: 7px 4px; }
.ydh-link { appearance: none; border: none; background: none; color: var(--ydh-terra); font: inherit; text-decoration: underline; cursor: pointer; padding: 0; }

/* community */
.ydh-threads { display: flex; flex-direction: column; gap: 12px; }
.ydh-thread { border: 1px solid var(--ydh-line); border-radius: 12px; overflow: hidden; }
.ydh-thread__head { width: 100%; display: flex; align-items: center; gap: 12px; padding: 14px 16px; background: #fff; border: none; font: inherit; text-align: left; cursor: pointer; }
.ydh-thread__head:hover { background: var(--ydh-paper); }
.ydh-thread__title { font-weight: 700; color: var(--ydh-ink); flex: 1; }
.ydh-thread__meta { font-size: 12px; color: var(--ydh-body); white-space: nowrap; }
.ydh-thread__panel { padding: 4px 16px 16px; border-top: 1px solid var(--ydh-line); background: var(--ydh-paper); }
.ydh-thread__body { font-size: 14px; line-height: 1.6; color: var(--ydh-ink); margin: 14px 0; }
.ydh-replies { list-style: none; margin: 0 0 14px; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.ydh-reply { display: flex; gap: 10px; font-size: 14px; line-height: 1.55; }
.ydh-reply__author { font-weight: 700; color: var(--ydh-green); flex: none; }
.ydh-reply__text { color: var(--ydh-body); }
.ydh-replyform { display: flex; gap: 8px; }
.ydh-input { flex: 1; border: 1px solid var(--ydh-line); border-radius: 8px; padding: 9px 12px; font: inherit; font-size: 14px; }
.ydh-input:focus-visible { outline: 2px solid var(--ydh-ivy); outline-offset: 1px; }

/* opportunities */
.ydh-opps { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.ydh-opp { border: 1px solid var(--ydh-line); border-radius: 12px; padding: 16px 18px; background: #fff; display: flex; flex-direction: column; }
.ydh-opp__top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
.ydh-opp__type { font-size: 12px; font-weight: 700; color: var(--ydh-terra); background: #fbeae6; padding: 4px 10px; border-radius: 6px; }
.ydh-opp__role { font-size: 16px; font-weight: 700; margin: 0 0 2px; color: var(--ydh-ink); }
.ydh-opp__org { font-size: 13px; color: var(--ydh-body); margin: 0 0 10px; }
.ydh-opp__blurb { font-size: 14px; line-height: 1.55; color: var(--ydh-body); margin: 0 0 12px; }
.ydh-opp__tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 14px; }
.ydh-pill { font-size: 12px; font-weight: 600; color: var(--ydh-green); background: var(--ydh-sage); padding: 3px 10px; border-radius: 999px; }
.ydh-opp__actions { display: flex; gap: 8px; align-items: center; margin-top: auto; }

/* dashboard */
.ydh-levelcard { display: flex; gap: 16px; align-items: center; padding: 18px 20px; border-radius: 14px; margin-bottom: 22px;
  background: linear-gradient(120deg, var(--ydh-green) 0%, var(--ydh-green2) 100%); color: #fff; }
.ydh-levelcard__badge { flex: none; width: 54px; height: 54px; border-radius: 14px; display: flex; align-items: center; justify-content: center;
  background: var(--ydh-terra); color: #fff; font-weight: 800; font-size: 15px; }
.ydh-levelcard__body { flex: 1; }
.ydh-levelcard__row { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 8px; font-size: 15px; }
.ydh-levelcard__row span { font-size: 13px; color: #b9d4c8; }
.ydh-levelcard__hint { margin: 8px 0 0; font-size: 12px; color: #b9d4c8; }

.ydh-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 24px; }
.ydh-stat { border: 1px solid var(--ydh-line); border-radius: 10px; padding: 14px; text-align: center; }
.ydh-stat .n { display: block; font-size: 26px; font-weight: 800; color: var(--ydh-green); }
.ydh-stat .l { display: block; font-size: 12px; color: var(--ydh-body); margin-top: 4px; }
.ydh-dashgrid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.ydh-prog { margin-bottom: 12px; }
.ydh-prog__row { display: flex; justify-content: space-between; font-size: 13px; color: var(--ydh-body); margin-bottom: 5px; }
.ydh-bar { height: 8px; background: var(--ydh-sage); border-radius: 999px; overflow: hidden; }
.ydh-bar span { display: block; height: 100%; background: var(--ydh-ivy); border-radius: 999px; transition: width .4s ease; }
.ydh-bar--xp { height: 9px; background: rgba(255,255,255,.22); }
.ydh-bar--xp span { background: var(--ydh-gold); }

.ydh-badges { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.ydh-badge2 { display: flex; flex-direction: column; align-items: center; gap: 4px; text-align: center;
  border: 1px solid var(--ydh-line); border-radius: 10px; padding: 12px 8px; background: var(--ydh-paper); opacity: .45; filter: grayscale(1); }
.ydh-badge2.is-on { opacity: 1; filter: none; background: #fff; border-color: #cfe4d7; }
.ydh-badge2__i { font-size: 22px; }
.ydh-badge2__n { font-size: 11px; font-weight: 700; color: var(--ydh-green); line-height: 1.2; }

.ydh-savedlist { margin: 0; padding-left: 18px; font-size: 14px; color: var(--ydh-ink); display: flex; flex-direction: column; gap: 6px; }
.ydh-reset { margin-top: 22px; }

:where(.ydh) button:focus-visible, :where(.ydh) a:focus-visible, :where(.ydh) input:focus-visible { outline: 2px solid var(--ydh-ivy); outline-offset: 2px; }

@media (max-width: 680px) {
  .ydh-lessons, .ydh-opps { grid-template-columns: 1fr; }
  .ydh-stats { grid-template-columns: repeat(2, 1fr); }
  .ydh-dashgrid { grid-template-columns: 1fr; gap: 20px; }
  .ydh-badges { grid-template-columns: repeat(3, 1fr); }
  .ydh-search { margin-left: 0; width: 100%; }
}