/* ==========================================================================
   Stock Trading University — strategy-session signup, stub modal (no backend).
   Opened by any .tf-cta click. Light theme, green accent #0e8a50.
   ========================================================================== */
:root {
  --stu-accent: #0e8a50;
  --stu-accent-dark: #0b6e40;
  --stu-ink: #12271b;
  --stu-muted: #4a5f52;
  --stu-line: #d8e6dc;
  --stu-bg: #ffffff;
  --stu-soft: #f1f7f0;
  --stu-err: #e5484d;
}

.stu-overlay {
  position: fixed;
  inset: 0;
  background: rgba(11, 31, 21, 0.55);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 100000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s;
}
.stu-overlay.stu-open { opacity: 1; visibility: visible; }

.stu-modal {
  position: relative;
  width: 100%;
  max-width: 460px;
  background: var(--stu-bg);
  border-radius: 18px;
  box-shadow: 0 30px 90px rgba(11, 31, 21, 0.35);
  padding: 34px 32px 30px;
  color: var(--stu-ink);
  font-family: "Inter", system-ui, -apple-system, Arial, sans-serif;
  transform: translateY(16px) scale(0.97);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  box-sizing: border-box;
}
.stu-overlay.stu-open .stu-modal { transform: translateY(0) scale(1); }
.stu-modal *, .stu-modal *::before, .stu-modal *::after { box-sizing: border-box; }

.stu-close {
  position: absolute;
  top: 14px; right: 14px;
  width: 34px; height: 34px;
  border: none; background: transparent;
  color: var(--stu-muted);
  font-size: 26px; line-height: 1;
  cursor: pointer; border-radius: 8px;
  transition: color 0.15s, background 0.15s;
}
.stu-close:hover { color: var(--stu-ink); background: var(--stu-soft); }

.stu-bar { width: 46px; height: 4px; border-radius: 99px; background: var(--stu-accent); margin-bottom: 18px; }
.stu-modal h3 { font-size: 23px; font-weight: 800; margin: 0 0 6px; color: var(--stu-ink); line-height: 1.25; }
.stu-modal .stu-sub { font-size: 14px; color: var(--stu-muted); margin: 0 0 22px; line-height: 1.5; }

.stu-fields { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.stu-field { display: flex; flex-direction: column; gap: 6px; }
.stu-field.stu-full { grid-column: 1 / -1; }
.stu-field label { font-size: 12px; font-weight: 700; color: var(--stu-muted); text-transform: uppercase; letter-spacing: 0.03em; }
.stu-modal input {
  width: 100% !important;
  padding: 13px 14px !important;
  border: 1.5px solid var(--stu-line) !important;
  border-radius: 10px !important;
  font-size: 16px !important;
  font-family: inherit !important;
  color: var(--stu-ink) !important;
  background: #fff !important;
  box-shadow: none !important;
  margin: 0 !important; height: auto !important;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.stu-modal input::placeholder { color: #9bb0a2 !important; }
.stu-modal input:focus {
  outline: none;
  border-color: var(--stu-accent) !important;
  box-shadow: 0 0 0 3px rgba(14, 138, 80, 0.16) !important;
}
.stu-field.stu-invalid input { border-color: var(--stu-err) !important; }
.stu-field .stu-err { font-size: 12px; color: var(--stu-err); display: none; }
.stu-field.stu-invalid .stu-err { display: block; }

.stu-submit {
  appearance: none !important;
  width: 100% !important;
  margin-top: 22px !important;
  border: none !important;
  border-radius: 10px !important;
  padding: 15px 20px !important;
  font-family: inherit !important;
  font-size: 16px !important;
  font-weight: 800 !important;
  letter-spacing: 0.01em !important;
  color: #fff !important;
  background: var(--stu-accent) !important;
  cursor: pointer;
  transition: background 0.15s, transform 0.05s, opacity 0.15s;
}
.stu-submit:hover { background: var(--stu-accent-dark) !important; }
.stu-submit:active { transform: translateY(1px); }
.stu-submit[disabled] { opacity: 0.6; cursor: not-allowed; }
.stu-note { margin-top: 14px; font-size: 12px; color: var(--stu-muted); text-align: center; }

.stu-success { text-align: center; display: none; }
.stu-modal.stu-done .stu-form { display: none; }
.stu-modal.stu-done .stu-success { display: block; }
.stu-check {
  width: 72px; height: 72px; margin: 4px auto 20px; border-radius: 50%;
  background: rgba(14, 138, 80, 0.12);
  display: flex; align-items: center; justify-content: center;
}
.stu-check svg { width: 38px; height: 38px; stroke: var(--stu-accent); }

@media (max-width: 480px) {
  .stu-modal { padding: 28px 20px 24px; }
  .stu-fields { grid-template-columns: 1fr; }
  .stu-modal h3 { font-size: 21px; }
}