/* =========================================================
   AILEARNIST — SHARED NAVBAR STYLES
   Loaded on every page by includes/header.php.
   Depends on the design tokens in /assets/css/base.css.
   ========================================================= */

/* ---------- Scroll progress ---------- */
.scroll-progress {
  position: fixed; top: 0; left: 0; right: 0; height: 3px; z-index: 1000; pointer-events: none;
}
.scroll-progress span {
  display: block; height: 100%; width: 100%;
  background: linear-gradient(90deg, var(--sk-lime), var(--sk-cyan) 50%, var(--sk-violet));
  transform-origin: left center; transform: scaleX(0);
  transition: transform .08s linear;
}

/* ---------- Bar ---------- */
.navbar {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--wrap); margin: 0 auto; padding: 12px 20px;
  display: flex; align-items: center; gap: 24px; position: relative;
}

/* ---------- Brand ---------- */
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); }
.brand-mark {
  width: 36px; height: 36px; border-radius: 11px; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--sk-cyan), var(--sk-violet));
  color: #fff; font-size: 1rem; box-shadow: 0 8px 18px -8px rgba(139, 92, 246, .7);
}
.brand-name { font-family: var(--font-head); font-weight: 700; font-size: 1.35rem; letter-spacing: -.02em; }
.brand-name span { color: var(--accent); }

/* ---------- Links ---------- */
.nav-links { display: flex; gap: 4px; flex: 1; }
.nav-links a {
  display: inline-flex; align-items: center; gap: 7px;
  text-decoration: none; color: var(--text-muted); font-weight: 500; font-size: .92rem;
  padding: 8px 11px; border-radius: 10px; transition: color .2s, background .2s;
}
.nav-links a:hover { color: var(--text); background: var(--bg-alt); }
.nav-links a.active { color: var(--accent); background: color-mix(in srgb, var(--accent) 10%, transparent); }
.nav-link-icon { display: none; width: 18px; text-align: center; }

/* ---------- Actions ---------- */
.nav-actions { display: flex; align-items: center; gap: 10px; margin-left: auto; }
.theme-toggle, .nav-burger {
  width: 38px; height: 38px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--bg-card); color: var(--text); cursor: pointer; display: grid; place-items: center;
  transition: border-color .2s, color .2s;
}
.theme-toggle:hover, .nav-burger:hover { border-color: var(--accent); color: var(--accent); }
.nav-burger { display: none; }
.nav-signin {
  text-decoration: none; font-weight: 600; font-size: .9rem; padding: 9px 16px; border-radius: 999px;
  background: var(--text); color: var(--bg); display: inline-block;
}

/* Sign-in tooltip */
.nav-login-wrap { position: relative; }
.nav-login-tooltip {
  position: absolute; top: calc(100% + 10px); right: 0; width: 240px; z-index: 60;
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 14px; box-shadow: var(--shadow);
  padding: 14px 16px; font-size: .84rem; color: var(--text-muted);
  opacity: 0; visibility: hidden; transform: translateY(-4px); transition: .18s ease;
}
.nav-login-tooltip strong { display: block; color: var(--text); margin-bottom: 6px; font-family: var(--font-head); }
.nav-login-tooltip ul { margin: 0; padding-left: 18px; }
.nav-login-wrap:hover .nav-login-tooltip,
.nav-login-wrap:focus-within .nav-login-tooltip { opacity: 1; visibility: visible; transform: none; }

/* ---------- Account menu ---------- */
.nav-user { position: relative; }
.nav-user__btn {
  display: inline-flex; align-items: center; gap: 6px; padding: 4px 8px 4px 4px;
  border: 1px solid var(--border); border-radius: 999px; background: var(--bg-card); color: var(--text); cursor: pointer;
}
.nav-avatar, .nav-initials { width: 30px; height: 30px; border-radius: 50%; object-fit: cover; }
.nav-initials {
  display: grid; place-items: center; font-weight: 700; font-size: .78rem; color: #fff;
  background: linear-gradient(135deg, var(--sk-cyan), var(--sk-violet));
}
.nav-user__caret { font-size: .7rem; color: var(--text-muted); transition: transform .2s; }
.nav-user.is-open .nav-user__caret { transform: rotate(180deg); }
.nav-user__menu {
  position: absolute; top: calc(100% + 10px); right: 0; min-width: 240px; z-index: 60;
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 16px; box-shadow: var(--shadow);
  padding: 8px; opacity: 0; visibility: hidden; transform: translateY(-4px); transition: .18s ease;
}
.nav-user.is-open .nav-user__menu { opacity: 1; visibility: visible; transform: none; }
.nav-user__head { padding: 10px 12px 12px; border-bottom: 1px solid var(--border); margin-bottom: 6px; display: grid; gap: 2px; }
.nav-user__name { font-weight: 700; }
.nav-user__email { font-size: .82rem; color: var(--text-muted); word-break: break-all; }
.nav-user__badge { font-size: .74rem; color: var(--text-muted); margin-top: 4px; }
.nav-user__menu a {
  display: flex; align-items: center; gap: 10px; padding: 9px 12px; border-radius: 10px;
  text-decoration: none; color: var(--text); font-size: .9rem;
}
.nav-user__menu a i { width: 16px; color: var(--text-muted); }
.nav-user__menu a:hover { background: var(--bg-alt); }
.nav-user__sep { height: 1px; background: var(--border); margin: 6px 4px; }
.nav-user__signout { color: var(--sk-coral) !important; }
.nav-user__signout i { color: var(--sk-coral) !important; }

/* ---------- Responsive ---------- */
@media (max-width: 1100px) {
  .nav-links {
    display: none; position: absolute; top: 100%; left: 0; right: 0; flex-direction: column;
    background: var(--bg-card); border-bottom: 1px solid var(--border); padding: 10px 16px 16px;
    box-shadow: var(--shadow);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 11px 12px; }
  .nav-link-icon { display: inline-block; }
  .nav-burger { display: grid; }
}
@media (max-width: 640px) {
  .nav-inner { gap: 12px; }
  .nav-signin { padding: 8px 13px; font-size: .84rem; }
  .nav-login-tooltip { display: none; }
}