src/styles/global.css

/* ============================================================
   FrameVis — global reset + base
   ============================================================ */

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

html,
body,
#root {
  height: 100%;
}

html {
  background: var(--bg);
  color-scheme: dark;
}

body {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-base);
  line-height: var(--lh-base);
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "ss01", "ss02";
  position: relative;
  overflow-x: hidden;
  overflow-y: auto;
}

/* Subtle film-grain overlay across the entire viewport, sits above bg
   but below interactive content. Keeps dark UI from feeling plastic. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: var(--grain);
  background-repeat: repeat;
  opacity: 0.35;
  mix-blend-mode: overlay;
  pointer-events: none;
  z-index: 1;
}

/* Cold blue undertone wash over the bottom of the viewport — adds depth */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% -10%, rgba(200, 169, 110, 0.04), transparent 60%),
    radial-gradient(ellipse at 110% 110%, rgba(50, 90, 130, 0.07), transparent 55%);
  pointer-events: none;
  z-index: 0;
}

#root {
  position: relative;
  z-index: 2;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--text);
}

p {
  margin: 0;
}

button {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--sp-2) var(--sp-4);
  cursor: pointer;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transition: background var(--transition), border-color var(--transition),
              color var(--transition);
}

button:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
}

button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #14110A;
  font-weight: 500;
}

button.primary:hover:not(:disabled) {
  background: #D8B97D;
  border-color: #D8B97D;
  color: #14110A;
}

button.ghost {
  border-color: transparent;
}

input,
textarea,
select {
  font-family: var(--font-mono);
  font-size: inherit;
  color: var(--text);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--sp-3) var(--sp-4);
  outline: none;
  transition: border-color var(--transition), background var(--transition);
}

input:focus,
textarea:focus,
select:focus {
  border-color: var(--accent);
  background: rgba(200, 169, 110, 0.04);
}

select option {
  background: var(--surface);
  color: var(--text);
}

input::placeholder {
  color: var(--text-faint);
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px dotted var(--accent-soft);
  transition: color var(--transition);
}

a:hover {
  color: #D8B97D;
}

::selection {
  background: var(--accent-dim);
  color: var(--text);
}

/* Custom scrollbars — narrow, monochrome */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}

*::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

*::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 0;
}

*::-webkit-scrollbar-thumb:hover {
  background: var(--accent-soft);
}

/* ---------- Utility classes ---------- */

.mono   { font-family: var(--font-mono); }
.serif  { font-family: var(--font-display); }
.muted  { color: var(--text-muted); }
.faint  { color: var(--text-faint); }
.accent { color: var(--accent); }
.danger { color: var(--danger); }

.label {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--text-muted);
}

.divider {
  height: 1px;
  background: var(--border);
  border: 0;
  margin: var(--sp-4) 0;
}

.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;
}

/* ---------- App shell layout ---------- */

.app {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  grid-template-rows: minmax(var(--topbar-h), auto) minmax(0, 1fr) auto;
  grid-template-areas:
    "sidebar topbar"
    "sidebar main"
    "sidebar footer";
  min-height: 100vh;
  min-height: 100dvh;
  width: 100%;
  max-width: 100%;
  overflow: visible;
}

.app--sidebar-hidden {
  grid-template-columns: 1fr;
  grid-template-areas:
    "topbar"
    "main"
    "footer";
}

.app--sidebar-hidden .app__sidebar {
  display: none;
}

.app__sidebar { grid-area: sidebar; }
.app__topbar  { grid-area: topbar; }
.app__main {
  grid-area: main;
  position: relative;
  overflow: visible;
  background: var(--bg);
  min-height: 0;
}

.app__footer {
  grid-area: footer;
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
  padding: var(--sp-4) var(--sp-6);
}

.app__footer-text {
  color: var(--text-faint);
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

@media (max-width: 1200px) {
  .app { grid-template-columns: var(--sidebar-w) 1fr; }
}

@media (max-width: 900px) {
  .app {
    grid-template-columns: 1fr;
    grid-template-rows: auto minmax(0, 1fr) auto;
    grid-template-areas:
      "topbar"
      "main"
      "footer";
    min-height: 100vh;
    min-height: 100dvh;
  }

  .app__sidebar {
    display: none;
  }

  .app--sidebar-hidden {
    grid-template-areas:
      "topbar"
      "main"
      "footer";
  }

  .app__footer {
    padding-inline: var(--sp-4);
  }
}