/* Scoped stylesheet for APMATHS Platform; does not modify legacy AI-CLO. */
.platform { max-width: 1050px; margin: 0 auto; padding: 1rem 0 3rem; }
.platform [hidden] { display: none !important; }
.platform-hero { padding: clamp(1rem, 4vw, 2.5rem) 0 1.4rem; }
.platform-hero h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); margin: .35rem 0; }
.platform-hero p { max-width: 780px; }
.platform-label { text-transform: uppercase; font-size: .8rem; letter-spacing: .11em; font-weight: 700; opacity: .75; }
.platform-note,.platform-help {font-size: .92rem; opacity: .8; line-height: 1.6;}
.platform-grid {display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 1rem;}
.platform-card {
  border: 1px solid var(--border-color,#d9e0e9); border-radius: 18px;
  padding: clamp(1rem,3vw,1.6rem); margin-bottom: 1.2rem;
  background: var(--card-bg,transparent); box-shadow: 0 3px 18px rgb(0 0 0 / .035);
}
.platform-card h2 {font-size: 1.22rem; margin: 0 0 1rem;}
.platform-card h3 {font-size: 1rem; margin-top: 1.4rem;}
.platform form label {display: flex; flex-direction: column; gap: .35rem; margin: .7rem 0; font-weight: 600; font-size: .94rem;}
.platform input,.platform select,.platform textarea {
  box-sizing: border-box; width: 100%; min-height: 42px; padding: .7rem .75rem;
  border: 1px solid #a9b4c3; border-radius: 9px; background: var(--card-bg,transparent);
  color: inherit; font: inherit;
}
.platform input:focus-visible,.platform select:focus-visible,.platform textarea:focus-visible,.platform-button:focus-visible {
  outline: 2px solid #2563eb; outline-offset: 2px;
}
.platform-button {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 42px; padding: .65rem 1rem; margin: .45rem .5rem .45rem 0;
  border: 1px solid #1753a4; border-radius: 9px; background: #1753a4;
  color: white; font: inherit; font-weight: 650; cursor: pointer; text-decoration: none;
}
.platform-button:hover {filter: brightness(1.08);}
.platform-button:disabled {opacity: .58; cursor: not-allowed;}
.platform-secondary {background: transparent; color: inherit; border-color: #8091a9;}
.platform-alert {
  padding: .95rem 1rem; margin: .7rem 0 1.2rem;
  border-radius: 10px; border: 1px solid #86a7d2;
  background: rgb(70 130 200 / .09); overflow-wrap: anywhere;
}
.platform-alert.platform-error {border-color: #c15b5b; background: rgb(200 70 70 / .08);}
.platform-accountbar {display: flex; justify-content: space-between; align-items: center; gap: 1rem; margin: 1rem 0;}
.platform-accountbar p {margin: .25rem 0; font-size: .9rem; overflow-wrap: anywhere;}
.platform-inline-form {display: flex; flex-wrap: wrap; gap: .8rem; align-items: end;}
.platform-inline-form label {flex: 1 1 220px; margin: 0;}
.platform-list {list-style: none; padding: 0; margin: 1rem 0;}
.platform-list li {border-top: 1px solid var(--border-color,#d9e0e9); padding: .7rem .1rem; line-height: 1.7; overflow-wrap: anywhere;}
.platform-list li:last-child {border-bottom: 1px solid var(--border-color,#d9e0e9);}
.platform-list li button {margin-left: .6rem; font-size: .86rem;}
.platform-invite {border: 1px dashed #1753a4; padding: 1rem; border-radius: 10px; overflow-wrap: anywhere; user-select: text;}
@media(max-width:740px) {
  .platform-grid {grid-template-columns:1fr;}
  .platform-accountbar {align-items: flex-start;}
  .platform .platform-button {max-width: 100%;}
  .platform-card {border-radius: 12px;}
}