/* ===================================================================
   SFDA Copilot — Base: reset, typography, app shell, scrollbars
   =================================================================== */

*, *::before, *::after { box-sizing: border-box; }

html { height: 100%; }
body {
  height: 100vh;
  margin: 0;
  padding: 0;
  font-family: var(--font-primary);
  color: var(--text-color-dark);
  background-color: var(--background-light);
  background-image: var(--gradient-background);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-headings);
  font-weight: 700;
  letter-spacing: -0.015em;
}

a { color: var(--primary-color); text-decoration: none; }
a:hover { color: var(--accent-link); }

.container-fluid, .row { height: 100%; margin: 0; padding: 0; }

/* Landing scrolls within the viewport; chat is a fixed-height shell so the
   input bar stays pinned and the messages list scrolls on its own. */
#unauthenticated-view { overflow-y: auto; }
#authenticated-view { display: flex; flex-direction: column; height: 100%; }
#authenticated-view > .row { flex: 1; min-height: 0; }

/* Brand wordmark gradient */
.text-gradient,
.hero-title-wrapper h1 {
  background: var(--gradient-brand-flow);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* Scrollbars */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: linear-gradient(var(--accent-color), var(--accent-warm));
  border-radius: 10px;
  border: 2px solid transparent;
  background-clip: padding-box;
}
::-webkit-scrollbar-thumb:hover { background: var(--accent-warm); background-clip: padding-box; }

/* Accessibility helpers */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
:focus-visible { outline: 2px solid var(--accent-color); outline-offset: 2px; }

.hidden { display: none !important; }

/* ——————————————— Mobile navbar ——————————————— */
.navbar.d-lg-none {
  color: #fff;
  background: var(--gradient-brand);
  box-shadow: var(--shadow-md);
}
.navbar.d-lg-none .navbar-brand {
  font-family: var(--font-headings);
  font-weight: 800;
  font-size: 1.1rem;
  color: #fff;
}
.navbar.d-lg-none .navbar-toggler { border-color: var(--white-20); }
.navbar.d-lg-none .navbar-toggler-icon { background-image: var(--navbar-toggler-icon); }

/* ——————————————— Sidebar ——————————————— */
.sidebar, .offcanvas.offcanvas-start {
  position: sticky;
  top: 0;
  display: flex;
  flex-direction: column;
  height: 100vh;
  padding: 22px;
  overflow-y: auto;
  color: var(--text-color-dark);
  background: var(--gradient-background);
  border-right: 1px solid var(--border-color-light);
}
.offcanvas.offcanvas-start { border-right: none; }
.offcanvas.offcanvas-start .offcanvas-header {
  border-bottom: 1px solid var(--border-color-light);
  background: var(--background-light);
}
.offcanvas.offcanvas-start .offcanvas-body.sidebar { padding: 20px; }

.sidebar-header {
  padding-bottom: 16px;
  margin-bottom: 22px;
  border-bottom: 1px solid var(--border-color-light);
  animation: sidebarReveal var(--duration-l) var(--ease-soft) forwards;
}
.sidebar-header h3 {
  margin-bottom: 8px;
  font-family: var(--font-headings);
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-color-dark);
}
.sidebar-header h3 i { font-size: 1.1rem; color: var(--accent-warm); }
.sidebar-header .text-muted {
  font-size: .85rem; font-weight: 500; color: var(--text-color-dark-muted);
}
.auth-status-container {
  padding: 10px 14px;
  margin-top: 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color-light);
  background: var(--glass-bg-subtle);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.auth-status-container .small { color: var(--text-color-light-secondary); font-size: .82rem; }

/* ——————————————— Chat shell ——————————————— */
.chat-area {
  position: relative;
  min-height: 0;
  overflow: hidden;
  background:
    radial-gradient(900px 500px at 80% -10%, rgba(59 130 246 / 0.10) 0%, transparent 55%),
    radial-gradient(800px 500px at 0% 110%, rgba(100 116 139 / 0.10) 0%, transparent 55%),
    var(--background-light);
}
.chat-container {
  position: relative;
  z-index: 2;
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
}
.messages {
  display: flex;
  flex-direction: column;
  gap: 18px;
  flex: 1;
  min-height: 0;
  padding: 24px clamp(12px, 4vw, 48px);
  overflow-y: auto;
  scroll-behavior: smooth;
}
/* Reserve a lane on the right wide enough to fully clear the floating
   companion (≈134px footprint) so message bubbles never collide with it. */
@media (min-width: 1200px) {
  .messages { padding-right: 168px; }
}

/* Reduced motion: calm everything down */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
}