/* ==========================================================================
   DiveCohorts — theme layer on top of Bootstrap 5.
   Palette: deep teal + signal-buoy coral, cool sea-foam neutrals.
   Avoids the generic Bootstrap blue/purple defaults on purpose.
   ========================================================================== */

:root {
  --dc-teal-900: #0e2a32;
  --dc-teal-700: #0b6e7f;
  --dc-teal-500: #14879a;
  --dc-teal-100: #e3f0f1;
  --dc-coral: #ff6f59;
  --dc-coral-600: #e5573f;
  --dc-slate: #5c7079;
  --dc-mist: #f2f6f6;
  --dc-border: #dce6e6;
  --dc-success: #2e9e6d;

  --bs-primary: var(--dc-teal-700);
  --bs-primary-rgb: 11, 110, 127;
  --bs-body-bg: var(--dc-mist);
  --bs-body-color: var(--dc-teal-900);
  --bs-border-color: var(--dc-border);
  --bs-link-color: var(--dc-teal-700);
  --bs-link-hover-color: var(--dc-teal-900);

  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body {
  background-color: var(--dc-mist);
}

h1, h2, .display-heading {
  font-family: "Fraunces", Georgia, serif;
  font-weight: 600;
  color: var(--dc-teal-900);
}

/* ---- Signature element: a thin "depth gauge" tick rule under the navbar,
   the one deliberately decorative touch on an otherwise plain-UI app. ---- */
.depth-rule {
  height: 6px;
  background: repeating-linear-gradient(
    90deg,
    var(--dc-teal-700) 0px,
    var(--dc-teal-700) 2px,
    transparent 2px,
    transparent 10px
  );
  opacity: 0.35;
}

/* ---- Navbar ---- */
.navbar-dc {
  background-color: var(--dc-teal-900);
}
.navbar-dc .navbar-brand {
  font-family: "Fraunces", Georgia, serif;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: #fff !important;
}
.navbar-dc .nav-link {
  color: rgba(255, 255, 255, 0.78) !important;
  font-weight: 500;
}
.navbar-dc .nav-link.active {
  color: #fff !important;
  position: relative;
}
.navbar-dc .nav-link.active::after {
  content: "";
  position: absolute;
  left: 0.5rem;
  right: 0.5rem;
  bottom: -2px;
  height: 2px;
  background: var(--dc-coral);
  border-radius: 2px;
}

/* ---- Mobile nav: the collapsed menu becomes a dropdown-style panel
   (shadow, rounded corners, its own surface) instead of plain stacked
   links blending into the navbar. Only below the lg breakpoint, where
   Bootstrap's navbar-collapse is JS-controlled rather than always-visible
   flex. ---- */
@media (max-width: 991.98px) {
  .navbar-dc .navbar-collapse {
    background-color: var(--dc-teal-900);
    margin-top: 0.5rem;
    padding: 0.5rem 0.25rem 0.75rem;
    border-radius: 0 0 0.75rem 0.75rem;
    box-shadow: 0 12px 24px rgba(14, 42, 50, 0.35);
  }
  .navbar-dc .nav-link {
    padding: 0.6rem 0.75rem;
    border-radius: 0.5rem;
  }
  .navbar-dc .nav-link:active,
  .navbar-dc .nav-link:hover {
    background-color: rgba(255, 255, 255, 0.08);
  }
  /* The underline active-indicator reads well on a horizontal desktop
     bar but is easy to miss in a stacked list — use a filled pill
     instead, like a typical dropdown-menu active item. */
  .navbar-dc .nav-link.active {
    background-color: rgba(255, 255, 255, 0.12);
  }
  .navbar-dc .nav-link.active::after {
    display: none;
  }
}

/* ---- Buttons ---- */
.btn-primary {
  background-color: var(--dc-teal-700);
  border-color: var(--dc-teal-700);
}
.btn-primary:hover, .btn-primary:focus {
  background-color: var(--dc-teal-900);
  border-color: var(--dc-teal-900);
}
.btn-accent {
  background-color: var(--dc-coral);
  border-color: var(--dc-coral);
  color: #fff;
}
.btn-accent:hover {
  background-color: var(--dc-coral-600);
  border-color: var(--dc-coral-600);
  color: #fff;
}
.btn-outline-primary {
  color: var(--dc-teal-700);
  border-color: var(--dc-teal-700);
}
.btn-outline-primary:hover {
  background-color: var(--dc-teal-700);
  border-color: var(--dc-teal-700);
}

/* ---- Cards ---- */
.card {
  border: 1px solid var(--dc-border);
  border-radius: 0.75rem;
  box-shadow: 0 1px 2px rgba(14, 42, 50, 0.04);
}
.card-dc-clickable {
  cursor: pointer;
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}
.card-dc-clickable:hover {
  box-shadow: 0 6px 16px rgba(14, 42, 50, 0.1);
  transform: translateY(-1px);
}

/* ---- Avatars ---- */
.dc-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background-color: var(--dc-teal-100);
  color: var(--dc-teal-700);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  flex-shrink: 0;
}
.dc-avatar-lg {
  width: 88px;
  height: 88px;
  font-size: 2rem;
}

/* ---- Badges / difficulty pills ---- */
.badge-difficulty-beginner { background-color: #2e9e6d; }
.badge-difficulty-intermediate { background-color: #d99a2b; }
.badge-difficulty-advanced { background-color: #e5573f; }
.badge-difficulty-tech { background-color: #7a5cd9; }

/* ---- Empty states ---- */
.dc-empty {
  text-align: center;
  padding: 4rem 1.5rem;
  color: var(--dc-slate);
}
.dc-empty i {
  font-size: 2.75rem;
  opacity: 0.35;
  display: block;
  margin-bottom: 0.75rem;
}

/* ---- Auth screens ---- */
.auth-shell {
  min-height: calc(100vh - 46px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
}
.auth-card {
  max-width: 420px;
  width: 100%;
}

/* ---- Utility ---- */
.text-slate { color: var(--dc-slate) !important; }
.cursor-pointer { cursor: pointer; }
.dc-tab-bar .nav-link { color: var(--dc-slate); }
.dc-tab-bar .nav-link.active {
  color: var(--dc-teal-700);
  font-weight: 600;
  border-bottom: 2px solid var(--dc-teal-700);
}