learning_ai_notes/web/src/app/globals.css

@import "tailwindcss";

/* Design tokens imported via @bytelyst/design-tokens/css/notelett in layout.tsx */
/* === END design tokens === */

* {
  box-sizing: border-box;
}

html {
  background: var(--nl-bg-canvas);
}

body {
  margin: 0;
  min-height: 100vh;
  background: linear-gradient(180deg, var(--nl-bg-canvas) 0%, #0b1020 100%);
  color: var(--nl-text-primary);
  font-family: var(--nl-font-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
textarea,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 280px 1fr;
}

.sidebar {
  border-right: 1px solid var(--nl-border-default);
  background: rgba(12, 17, 31, 0.82);
  backdrop-filter: blur(16px);
}

.main-panel {
  min-width: 0;
  padding: var(--nl-space-8);
}

.surface-card {
  border: 1px solid var(--nl-border-default);
  border-radius: var(--nl-radius-md);
  background: rgba(18, 23, 37, 0.86);
  box-shadow: var(--nl-elevation-md);
}

.surface-muted {
  border: 1px solid var(--nl-border-default);
  border-radius: var(--nl-radius-sm);
  background: rgba(26, 35, 53, 0.72);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-radius: var(--nl-radius-pill);
  padding: 6px 10px;
  background: rgba(90, 140, 255, 0.14);
  color: var(--nl-text-primary);
  font-size: var(--nl-fs-sm);
}

.input-shell {
  width: 100%;
  border: 1px solid var(--nl-border-default);
  border-radius: var(--nl-radius-sm);
  background: rgba(10, 15, 28, 0.88);
  color: var(--nl-text-primary);
  padding: 12px 14px;
}

.page-grid {
  display: grid;
  gap: var(--nl-space-6);
}

@media (max-width: 980px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--nl-border-default);
  }
}

/* Focus-visible — keyboard accessibility */
*:focus-visible {
  outline: 2px solid var(--nl-accent-primary, #5A8CFF);
  outline-offset: 2px;
  border-radius: 4px;
}

*:focus:not(:focus-visible) {
  outline: none;
}

/* Screen-reader only utility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Interactive hover/active states */
button, [role="button"], a {
  transition: opacity 0.15s ease, background-color 0.15s ease;
}
button:hover:not(:disabled), [role="button"]:hover:not(:disabled) {
  opacity: 0.85;
}
button:active:not(:disabled), [role="button"]:active:not(:disabled) {
  opacity: 0.7;
}

/* Skip-to-content link (keyboard accessibility) */
.skip-to-content {
  position: absolute; left: -9999px; top: auto; width: 1px; height: 1px; overflow: hidden; z-index: 9999;
}
.skip-to-content:focus {
  position: fixed; top: 8px; left: 8px; width: auto; height: auto;
  padding: 12px 24px; background: var(--nl-bg-elevated); color: var(--nl-accent);
  border: 2px solid var(--nl-accent); border-radius: 8px; font-size: 14px; font-weight: 600; text-decoration: none;
}

/* Responsive sidebar */
@media (max-width: 768px) {
  .app-sidebar {
    position: fixed !important;
    left: -280px !important;
    top: 0 !important;
    z-index: 40;
    width: 260px !important;
    height: 100vh !important;
    transition: left 0.2s ease;
    overflow-y: auto;
  }
  .app-sidebar.open { left: 0 !important; }
  .sidebar-overlay { display: none; position: fixed; inset: 0; z-index: 39; background: rgba(0,0,0,0.5); }
  .sidebar-overlay.open { display: block; }
  .sidebar-toggle {
    display: flex; align-items: center; justify-content: center;
    position: fixed; top: 12px; left: 12px; z-index: 38;
    width: 40px; height: 40px; border-radius: 8px;
    border: 1px solid var(--nl-border-default, #2a2a4a);
    background: var(--nl-bg-elevated, #12151c);
    color: var(--nl-text-primary, #fff);
    cursor: pointer; font-size: 20px; line-height: 1;
  }
}
@media (min-width: 769px) {
  .sidebar-toggle { display: none !important; }
  .sidebar-overlay { display: none !important; }
}

/* Respect user motion preference */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Respect OS dark/light preference */
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --nl-bg-canvas: #F8FAFC;
    --nl-bg-elevated: #FFFFFF;
    --nl-surface-card: #FFFFFF;
    --nl-surface-muted: #F1F5F9;
    --nl-text-primary: #0F172A;
    --nl-text-secondary: #475569;
    --nl-text-tertiary: #94A3B8;
  }
}

/* ── Responsive Sidebar ──────────────────────────────────────── */

.app-layout {
  display: flex;
  min-height: 100vh;
}

.app-sidebar {
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  z-index: 40;
  transition: transform 0.22s ease;
}

.app-sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 39;
}

.app-main {
  flex: 1;
  min-width: 0;
}

@media (max-width: 768px) {
  .app-sidebar {
    transform: translateX(-100%);
  }
  .app-sidebar[data-open="true"] {
    transform: translateX(0);
  }
  .app-sidebar-overlay[data-open="true"] {
    display: block;
  }
  .app-main {
    margin-left: 0 !important;
  }
}

@media (min-width: 769px) {
  .app-sidebar {
    transform: translateX(0);
  }
}

.mobile-menu-btn {
  display: none;
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 38;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  font-size: 20px;
  align-items: center;
  justify-content: center;
}

@media (max-width: 768px) {
  .mobile-menu-btn {
    display: flex;
  }
}