/* ===== Become an instructor ===== */
.bi-hero { padding: 48px 0 56px; }
.bi-hero-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 48px; align-items: center; margin-top: 8px; }
.bi-hero h1 { font-size: 60px; }
.bi-hero .lead { margin-top: 18px; }
.bi-hero .hero-cta { display: inline-flex; gap: 12px; margin-top: 26px; }
.bi-hero .hero-cta .btn-secondary { padding: 15px 24px; font-size: 15px; }
.bi-trust { margin-top: 20px; font-size: 13px; color: var(--muted); font-weight: 600; }
.bi-hero-media { border-radius: var(--r-2xl); overflow: hidden; aspect-ratio: 4/3; box-shadow: var(--shadow-lg); }
.bi-hero-media img { width: 100%; height: 100%; object-fit: cover; display: block; }
.bi-check { width: 72px; height: 72px; border-radius: 50%; background: var(--teal-bright); color: #fff; font-size: 36px; font-weight: 800; display: flex; align-items: center; justify-content: center; margin: 0 auto 20px; box-shadow: 0 12px 30px -8px rgba(21,164,122,0.5); }

/* steps */
.bi-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.bi-step { background: var(--bg); border: 1px solid var(--line); border-radius: var(--r-xl); overflow: hidden; }
.bi-step-img { aspect-ratio: 16/10; background: var(--plum-soft); background-size: cover; background-position: center; position: relative; }
.bi-step-n { position: absolute; left: 14px; bottom: 14px; width: 34px; height: 34px; border-radius: 50%; background: #fff; color: var(--plum); font-family: 'Inter Tight', sans-serif; font-weight: 800; font-size: 16px; display: flex; align-items: center; justify-content: center; box-shadow: var(--shadow-sm); }
.bi-step h3 { font-family: 'Inter Tight', sans-serif; font-size: 17px; font-weight: 800; letter-spacing: -0.01em; margin: 18px 18px 6px; color: var(--ink); }
.bi-step p { font-size: 13.5px; color: var(--muted); line-height: 1.55; margin: 0 18px 20px; }

/* why */
.bi-why { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.bi-why-card { background: var(--bg); border: 1px solid var(--line); border-radius: var(--r-xl); padding: 26px; }
.bi-why-card .ic { width: 44px; height: 44px; border-radius: 12px; background: var(--plum-soft); color: var(--plum); display: flex; align-items: center; justify-content: center; margin-bottom: 16px; }
.bi-why-card .ic svg { width: 22px; height: 22px; }
.bi-why-card h3 { font-family: 'Inter Tight', sans-serif; font-size: 16px; font-weight: 800; letter-spacing: -0.01em; margin-bottom: 8px; color: var(--ink); }
.bi-why-card p { font-size: 13.5px; color: var(--muted); line-height: 1.55; }

/* form */
.bi-form-head { max-width: 680px; margin-bottom: 32px; }
.bi-form { background: var(--bg); border: 1px solid var(--line); border-radius: var(--r-2xl); padding: 36px; box-shadow: var(--shadow-md); max-width: 960px; }
.bi-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-bottom: 8px; }
.bi-grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin: 20px 0; }
.fld { display: flex; flex-direction: column; gap: 7px; }
.fld.span2 { grid-column: 1 / -1; }
.fld > span { font-size: 13px; font-weight: 700; color: var(--ink); }
.fld > span small { font-weight: 500; color: var(--muted); }
.fld input, .fld select, .fld textarea { padding: 11px 13px; border: 1px solid var(--line-strong); border-radius: var(--r-sm); font-size: 14px; font-family: inherit; color: var(--ink); background: var(--bg); outline: none; transition: border-color 0.15s; }
.fld input:focus, .fld select:focus, .fld textarea:focus { border-color: var(--plum); box-shadow: 0 0 0 3px var(--plum-soft); }
.fld textarea { resize: vertical; line-height: 1.5; }
.fld select { -webkit-appearance: none; -moz-appearance: none; appearance: none; padding-right: 36px; cursor: pointer; color-scheme: light;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='13' height='13' viewBox='0 0 24 24' fill='none' stroke='%235C1E47' stroke-width='2.6' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 13px center; background-size: 13px; }
.fld select option { background: #fff; color: var(--ink); }

.bi-set { border: 1px solid var(--line); border-radius: var(--r-lg); padding: 18px; margin-top: 20px; }
.bi-set legend { font-size: 13px; font-weight: 800; color: var(--ink); padding: 0 8px; }
.bi-grid3 .bi-set { margin-top: 0; }
.bi-checks { display: flex; flex-wrap: wrap; gap: 8px; }
.bi-checks.col { flex-direction: column; gap: 10px; }
.chk { display: inline-flex; align-items: center; gap: 8px; padding: 8px 12px; border: 1px solid var(--line-strong); border-radius: var(--r-full); font-size: 13px; font-weight: 600; color: var(--ink-2); cursor: pointer; transition: all 0.15s; user-select: none; }
.bi-checks.col .chk { border-radius: var(--r-sm); }
.chk:hover { border-color: var(--ink); }
.chk input { accent-color: var(--plum); width: 15px; height: 15px; }
.chk:has(input:checked) { background: var(--plum-soft); border-color: var(--plum); color: var(--plum); }

.bi-errors { background: #FFE5E1; border: 1px solid #F3B4AC; color: #B83830; border-radius: var(--r-lg); padding: 16px 20px; margin-bottom: 24px; max-width: 960px; font-size: 14px; }
.bi-errors ul { margin: 8px 0 0 18px; }
.bi-submit { display: flex; align-items: center; gap: 18px; margin-top: 28px; flex-wrap: wrap; }
.bi-submit .btn-primary { padding: 15px 28px; font-size: 15px; }
.bi-submit span { font-size: 12.5px; color: var(--muted); }
.bi-submit a { color: var(--plum); font-weight: 700; }

@media (max-width: 1024px) {
  .bi-hero-grid { grid-template-columns: 1fr; }
  .bi-hero h1 { font-size: 42px; }
  .bi-hero-media { display: none; }
  .bi-steps, .bi-why { grid-template-columns: 1fr 1fr; }
  .bi-grid3 { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .bi-steps, .bi-why, .bi-grid { grid-template-columns: 1fr; }
  .bi-form { padding: 22px; }
}