/* ============================================================
   Chalk & Board — a toolkit for ESL teachers
   Design tokens
   ============================================================ */
:root{
  --board:        #24332B;   /* blackboard green */
  --board-deep:    #1a251f;  /* darker recess / shadow */
  --board-light:   #2d3f35;  /* raised panel green */
  --chalk:         #f3f1e7;  /* chalk white */
  --chalk-dim:     #cfd0c6;  /* dusty chalk */
  --chalk-yellow:  #e8c05f;
  --chalk-coral:   #e2836f;
  --chalk-blue:    #8db4d4;
  --wood:          #6b4a34;  /* frame wood */
  --wood-dark:     #4a3122;
  --shadow: 0 10px 30px rgba(0,0,0,.35);
  --radius: 14px;
  --font-display: 'Caveat', cursive;
  --font-body: 'Work Sans', sans-serif;
  --font-mono: 'Space Mono', monospace;
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; scrollbar-gutter: stable; }

body{
  margin:0;
  background: var(--board);
  color: var(--chalk);
  font-family: var(--font-body);
  min-height: 100vh;
  position: relative;
}

/* chalk dust / board texture, layered so it never needs JS */
body::before{
  content:"";
  position: fixed; inset:0;
  pointer-events:none;
  z-index: 0;
  background-image:
    radial-gradient(rgba(255,255,255,.035) 1px, transparent 1px),
    radial-gradient(rgba(255,255,255,.02) 1px, transparent 1.5px);
  background-size: 3px 3px, 7px 7px;
  background-position: 0 0, 2px 3px;
  mix-blend-mode: screen;
  opacity:.6;
}

a{ color: inherit; }

/* ---------- layout shell ---------- */
.frame{
  max-width: 1100px;
  margin: 0 auto;
  padding: 28px 24px 80px;
  position: relative;
  z-index: 1;
}

.top-nav{
  display:flex;
  align-items:center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.brand{
  display:flex;
  align-items:baseline;
  gap: 10px;
  text-decoration:none;
}
.brand-mark{ width:34px; height:34px; }
.brand-name{
  font-family: var(--font-display);
  font-size: 1.9rem;
  letter-spacing: .5px;
  color: var(--chalk);
}
.brand-tag{
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--chalk-yellow);
  opacity:.85;
}

.back-link{
  font-family: var(--font-mono);
  font-size: .8rem;
  text-decoration:none;
  color: var(--chalk-dim);
  border-bottom: 1px dashed rgba(243,241,231,.35);
  padding-bottom:2px;
  transition: color .15s ease, border-color .15s ease;
}
.back-link:hover{ color: var(--chalk-yellow); border-color: var(--chalk-yellow); }

/* ---------- chalk rule / dividers ---------- */
.chalk-rule{
  border:0;
  height: 2px;
  margin: 28px 0;
  background: repeating-linear-gradient(90deg, rgba(243,241,231,.4) 0 10px, transparent 10px 16px);
  opacity:.5;
}

/* ---------- headline block ---------- */
.hero{
  padding: 10px 0 36px;
}
.hero h1{
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 6vw, 4.4rem);
  line-height: 1.05;
  margin: 0 0 10px;
  color: var(--chalk);
}
.hero h1 .accent{ color: var(--chalk-yellow); }
.hero p{
  font-size: 1.05rem;
  max-width: 56ch;
  color: var(--chalk-dim);
  margin:0;
}

/* ---------- tool directory grid ---------- */
.tool-grid{
  display:grid;
  grid-template-columns: repeat(auto-fit, minmax(240px,1fr));
  gap: 22px;
  margin-top: 30px;
}

.tool-card{
  background: var(--board-light);
  border-radius: var(--radius);
  padding: 26px 22px 22px;
  text-decoration:none;
  color: var(--chalk);
  position: relative;
  box-shadow: var(--shadow), inset 0 0 0 1px rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.06);
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
  display:flex;
  flex-direction: column;
  gap: 14px;
  min-height: 190px;
}
.tool-card:hover{
  transform: translateY(-4px) rotate(-.3deg);
  background: #33473c;
  box-shadow: 0 16px 34px rgba(0,0,0,.4), inset 0 0 0 1px rgba(255,255,255,.08);
}
.tool-card:focus-visible{
  outline: 2px solid var(--chalk-yellow);
  outline-offset: 3px;
}
.tool-card .icon{
  width: 52px; height: 52px;
}
.tool-card h2{
  font-family: var(--font-display);
  font-size: 1.9rem;
  margin: 0;
  color: var(--chalk);
}
.tool-card p{
  margin:0;
  font-size: .92rem;
  color: var(--chalk-dim);
  line-height: 1.4;
}
.tool-card .go{
  margin-top:auto;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--chalk-yellow);
}

/* ---------- generic panel ---------- */
.panel{
  background: var(--board-light);
  border-radius: var(--radius);
  padding: 30px;
  box-shadow: var(--shadow), inset 0 0 0 1px rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.06);
}

/* ---------- buttons ---------- */
.btn{
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  border: none;
  border-radius: 10px;
  padding: 13px 22px;
  cursor:pointer;
  background: var(--chalk-yellow);
  color: #2a2210;
  box-shadow: 0 4px 0 #a9843b, 0 6px 14px rgba(0,0,0,.35);
  transition: transform .08s ease, box-shadow .08s ease;
}
.btn:hover{ transform: translateY(-1px); }
.btn:active{
  transform: translateY(3px);
  box-shadow: 0 1px 0 #a9843b, 0 2px 6px rgba(0,0,0,.35);
}
.btn.secondary{
  background: transparent;
  color: var(--chalk);
  box-shadow: inset 0 0 0 1.5px rgba(243,241,231,.4);
}
.btn.secondary:hover{ box-shadow: inset 0 0 0 1.5px var(--chalk-yellow); }
.btn.coral{ background: var(--chalk-coral); box-shadow: 0 4px 0 #a1503f, 0 6px 14px rgba(0,0,0,.35); color:#2a1109;}
.btn:disabled{ opacity:.5; cursor:not-allowed; }

.btn-row{ display:flex; gap:12px; flex-wrap:wrap; align-items:center; }

/* ---------- form controls ---------- */
label{
  font-family: var(--font-mono);
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--chalk-dim);
  display:block;
  margin-bottom: 6px;
}
input[type="text"], input[type="number"], textarea, select{
  width:100%;
  background: var(--board-deep);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 8px;
  color: var(--chalk);
  padding: 10px 12px;
  font-family: var(--font-body);
  font-size: .95rem;
}
textarea{ resize: vertical; min-height: 120px; }
input:focus, textarea:focus, select:focus{ outline: 2px solid var(--chalk-yellow); }

/* ---------- footer ---------- */
.site-footer{
  margin-top: 60px;
  padding-top: 20px;
  border-top: 1px dashed rgba(243,241,231,.2);
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--chalk-dim);
  opacity:.7;
  text-align:center;
}

/* ---------- utility ---------- */
.stack{ display:flex; flex-direction:column; gap: 18px; }
.center{ display:flex; align-items:center; justify-content:center; }
.mono{ font-family: var(--font-mono); }
.two-col{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 26px;
}
@media (max-width: 720px){
  .two-col{ grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce){
  *{ animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}

/* ---------- print ---------- */
@media print{
  body{ background:#fff; color:#000; }
  body::before{ display:none; }
  .top-nav, .site-footer, .no-print{ display:none !important; }
  .panel{ box-shadow:none; background:#fff; border:1px solid #999; }
}