/*
 * Student Digital Mailbox — shared styles for the student + teacher pages.
 * Reuses the Curriculum Hub palette/fonts so it feels native to the site.
 */
:root {
  --navy: #15487f;
  --teal: #205fa6;
  --teal-light: rgba(32, 95, 166, 0.08);
  --green: #2c7d6b;
  --green-light: rgba(44, 125, 107, 0.08);
  --cream: #eaf0f7;
  --ink: #14223a;
  --muted: #56627a;
  --line: rgba(20, 34, 58, 0.12);
  --card: #ffffff;
  --surface-2: #f3f7fc;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  background: var(--cream);
  color: var(--ink);
  font-family: "Atkinson Hyperlegible", system-ui, sans-serif;
  font-size: 18px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(
      1100px 520px at 88% -8%,
      rgba(44, 125, 107, 0.14),
      transparent 60%
    ),
    radial-gradient(
      1000px 520px at -5% 2%,
      rgba(32, 95, 166, 0.16),
      transparent 58%
    ),
    var(--cream);
}
a {
  color: var(--teal);
  text-decoration: none;
}
a:hover {
  color: var(--green);
}
.wrap {
  max-width: 920px;
  margin: 0 auto;
  padding: clamp(28px, 6vw, 64px) clamp(18px, 5vw, 40px) 64px;
}

/* ---- Header ---- */
.mb-head {
  margin: 0 0 26px;
}
.mb-eyebrow {
  color: var(--teal);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 12px;
  margin: 0;
}
.mb-head h1 {
  font-family: "Nunito", system-ui, sans-serif;
  color: var(--ink);
  margin: 8px 0 12px;
  font-size: clamp(2rem, 6vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.mb-head h1 .mb-emoji {
  margin-right: 0.3em;
}
.mb-intro {
  color: var(--ink);
  margin: 0;
  font-size: clamp(1rem, 2.4vw, 1.18rem);
  max-width: 62ch;
}

/* ---- Safety / info notes ---- */
.mb-note {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  border-radius: 14px;
  padding: 16px 18px;
  margin: 22px 0;
  font-size: 1rem;
  border: 1px solid var(--line);
}
.mb-note .mb-note-icon {
  font-size: 1.4rem;
  line-height: 1.2;
  flex: 0 0 auto;
}
.mb-note.safety {
  background: #fff4e9;
  border-color: #f3c79a;
  color: #6b4310;
}
.mb-note.info {
  background: var(--teal-light);
  border-color: rgba(32, 95, 166, 0.25);
  color: var(--navy);
}
.mb-note strong {
  font-weight: 800;
}

/* ---- Submission cards grid ---- */
.mb-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  margin: 8px 0 36px;
}
.mb-card {
  display: flex;
  flex-direction: column;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.05);
  transition:
    transform 0.18s,
    box-shadow 0.18s,
    border-color 0.18s;
}
.mb-card:hover,
.mb-card:focus-within {
  transform: translateY(-3px);
  box-shadow: 0 10px 24px rgba(21, 72, 127, 0.13);
  border-color: rgba(32, 95, 166, 0.4);
}
.mb-card .mb-card-icon {
  font-size: 2rem;
  line-height: 1;
}
.mb-card h2 {
  font-family: "Nunito", system-ui, sans-serif;
  font-size: 1.28rem;
  font-weight: 800;
  color: var(--ink);
  margin: 12px 0 6px;
}
.mb-card p {
  color: var(--muted);
  margin: 0 0 18px;
  font-size: 1rem;
  flex: 1;
}

/* ---- Buttons ---- */
.mb-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 50px;
  padding: 0 22px;
  border-radius: 12px;
  font-family: "Nunito", system-ui, sans-serif;
  font-weight: 800;
  font-size: 1.02rem;
  text-align: center;
  cursor: pointer;
  border: 2px solid transparent;
  transition:
    background 0.15s,
    color 0.15s,
    box-shadow 0.15s;
}
.mb-btn:focus-visible {
  outline: 3px solid var(--green);
  outline-offset: 2px;
}
.mb-btn.primary {
  background: var(--navy);
  color: #fff;
}
.mb-btn.primary:hover {
  background: var(--teal);
  color: #fff;
}
.mb-btn.ghost {
  background: #fff;
  color: var(--navy);
  border-color: var(--line);
}
.mb-btn.ghost:hover {
  border-color: var(--teal);
  color: var(--teal);
}
.mb-card .mb-btn {
  width: 100%;
}
/* Disabled placeholder state — button never links anywhere broken. */
.mb-btn.coming-soon,
.mb-btn[aria-disabled="true"] {
  background: var(--surface-2);
  color: var(--muted);
  border-color: var(--line);
  cursor: not-allowed;
  pointer-events: none;
}

/* ---- "How to use" steps ---- */
.mb-section {
  margin: 34px 0;
}
.mb-section h2 {
  font-family: "Nunito", system-ui, sans-serif;
  font-size: 1.5rem;
  color: var(--ink);
  margin: 0 0 16px;
}
.mb-steps {
  list-style: none;
  counter-reset: step;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 12px;
}
.mb-steps li {
  counter-increment: step;
  display: flex;
  gap: 14px;
  align-items: center;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px 18px;
  font-size: 1.05rem;
}
.mb-steps li::before {
  content: counter(step);
  flex: 0 0 auto;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--green);
  color: #fff;
  font-family: "Nunito", system-ui, sans-serif;
  font-weight: 800;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ---- Footer / back nav ---- */
.mb-foot {
  margin-top: 40px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

@media (max-width: 480px) {
  .mb-grid {
    grid-template-columns: 1fr;
  }
}
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    scroll-behavior: auto;
  }
}