/* Topbar — calm header (Zerodha-like type, soft ink, generous nav air) */

:root {
  --topbar-height: 60px;
  --topbar-bg: var(--shell-frame-bg);
  --topbar-fg: #424242;
  --topbar-muted: #666666;
  --topbar-border: var(--shell-chrome-hairline);
  --topbar-hover-bg: color-mix(in srgb, var(--topbar-fg) 5%, transparent);
  --topbar-focus-ring: color-mix(in srgb, var(--topbar-fg) 28%, transparent);
  --topbar-item-radius: 4px;
  --topbar-pad-x: var(--shell-gutter);
  --topbar-cluster-gap: 1rem;
  --topbar-nav-gap: 1.35rem;
  --topbar-item-pad-x: 0.35rem;
  --topbar-item-pad-y: 0.4rem;
  --topbar-item-min-h: 36px;
  --topbar-link-size: calc(var(--kit-fs-md) + 0.6pt);
  --topbar-logo-size: calc(var(--kit-fs-md) + 0.6pt);
  --brand-mark: url("/assets/top20-mark.svg?v=6");
  /* Demo kit — How it works indigo/blue band (Back to home stays plain) */
  --demo-kit-bg: #eef0f9;
  --demo-kit-bg-hover: #e0e4f3;
  --demo-kit-border: color-mix(in srgb, var(--demo-kit-fg) 25%, transparent);
  --demo-kit-fg: #5a63a8;
}

[data-theme="dark"] {
  --topbar-bg: var(--shell-frame-bg);
  --topbar-fg: #e8e8e8;
  --topbar-muted: #9aa3b5;
  --topbar-border: var(--shell-chrome-hairline);
  --topbar-hover-bg: color-mix(in srgb, var(--topbar-fg) 8%, transparent);
  --topbar-focus-ring: color-mix(in srgb, var(--topbar-fg) 32%, transparent);
  --brand-mark: url("/assets/top20-mark.svg?v=6");
  --demo-kit-bg: #171826;
  --demo-kit-bg-hover: #1f2435;
  --demo-kit-border: color-mix(in srgb, var(--demo-kit-fg) 25%, transparent);
  --demo-kit-fg: #9aa3d4;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  height: calc(var(--topbar-height) + env(safe-area-inset-top, 0px));
  min-height: calc(var(--topbar-height) + env(safe-area-inset-top, 0px));
  padding: env(safe-area-inset-top, 0px) max(var(--topbar-pad-x), env(safe-area-inset-right, 0px)) 0
    max(var(--topbar-pad-x), env(safe-area-inset-left, 0px));
  background: var(--topbar-bg);
  border-bottom: 0.7px solid var(--topbar-border);
  box-shadow: none;
  color: var(--topbar-fg);
  font-family: var(--font-stack-body);
  -webkit-font-smoothing: antialiased;
}

/* Product + marketing pages — same white canvas as homepage / kit */
body:has(.app-shell) .topbar,
body:has(.page-shell) .topbar {
  padding: env(safe-area-inset-top, 0px) max(var(--topbar-pad-x), env(safe-area-inset-right, 0px)) 0
    max(var(--topbar-pad-x), env(safe-area-inset-left, 0px));
  background: var(--shell-frame-bg);
}

body:has(.app-shell) .topbar__start,
body:has(.app-shell) .topbar__actions,
body:has(.page-shell) .topbar__start,
body:has(.page-shell) .topbar__actions {
  background: transparent;
}

.topbar__start {
  display: flex;
  align-items: center;
  min-width: 0;
  flex: 0 0 auto;
}

.topbar__actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--topbar-cluster-gap);
  margin-left: auto;
  min-width: 0;
  flex: 0 1 auto;
}

.topbar__nav {
  display: flex;
  align-items: center;
  gap: var(--topbar-nav-gap);
  flex-wrap: nowrap;
}

.topbar__toolbar {
  display: flex;
  align-items: center;
  gap: var(--topbar-cluster-gap);
  flex-shrink: 0;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: var(--topbar-item-min-h);
  padding: var(--topbar-item-pad-y) var(--topbar-item-pad-x);
  margin-left: calc(var(--topbar-item-pad-x) * -1);
  border-radius: var(--topbar-item-radius);
  text-decoration: none;
  color: var(--topbar-fg);
  flex-shrink: 0;
  max-width: none;
  transition:
    color 160ms ease,
    background-color 160ms ease;
}

.logo::before {
  content: "";
  width: 24px;
  height: 24px;
  flex: 0 0 24px;
  background: var(--brand-mark) center / contain no-repeat;
}

.logo:hover {
  background: var(--topbar-hover-bg);
}

.logo__text,
.logo:not(:has(.logo__text)) {
  font-family: var(--font-body);
  font-size: var(--topbar-logo-size);
  font-weight: var(--font-medium);
  letter-spacing: normal;
  line-height: 1.4;
  white-space: nowrap;
  color: var(--topbar-fg);
}

.topbar__nav-link,
.demo-kit-link,
.topbar button.topbar__nav-link,
.topbar a.topbar__nav-link {
  font-family: var(--font-body);
  font-size: var(--topbar-link-size);
  font-weight: var(--font-regular);
  line-height: 1.7;
  letter-spacing: normal;
  text-transform: none;
  color: var(--topbar-muted);
}

.topbar__nav-link,
.topbar button.topbar__nav-link,
.topbar a.topbar__nav-link,
.demo-kit-link {
  display: inline-flex;
  align-items: center;
  min-height: var(--topbar-item-min-h);
  padding: var(--topbar-item-pad-y) var(--topbar-item-pad-x);
  border: none;
  border-radius: var(--topbar-item-radius);
  background: transparent;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition:
    color 160ms ease,
    background-color 160ms ease;
}

/* Demo kit — solid primary CTA (black / white by theme); Back stays plain */
.demo-kit-link {
  gap: 0.35rem;
  max-width: min(44ch, 42vw);
  overflow: hidden;
  text-overflow: ellipsis;
  font-weight: var(--font-medium);
  color: var(--color-btn-primary-fg);
  background: var(--color-btn-primary-bg);
  border: 1px solid var(--color-btn-primary-bg);
}

/*
  Index homepage (light / day only) — Demo kit matches CTA #1a1a1a / #ffffff.
  Button lives in .topbar (outside .home-page / .app-shell).
*/
html:not([data-theme="dark"]) body[data-state="sample"] #demo-kit-btn.demo-kit-link:not(.demo-kit-link--back),
html:not([data-theme="dark"])
  body:has(.app-shell.state-sample .home-page:not(.hidden))
  #demo-kit-btn.demo-kit-link:not(.demo-kit-link--back) {
  color: #ffffff;
  background: #1a1a1a;
  border-color: #1a1a1a;
}

html:not([data-theme="dark"]) body[data-state="sample"] #demo-kit-btn.demo-kit-link:not(.demo-kit-link--back):hover,
html:not([data-theme="dark"]) body[data-state="sample"] #demo-kit-btn.demo-kit-link:not(.demo-kit-link--back):focus-visible,
html:not([data-theme="dark"])
  body:has(.app-shell.state-sample .home-page:not(.hidden))
  #demo-kit-btn.demo-kit-link:not(.demo-kit-link--back):hover,
html:not([data-theme="dark"])
  body:has(.app-shell.state-sample .home-page:not(.hidden))
  #demo-kit-btn.demo-kit-link:not(.demo-kit-link--back):focus-visible {
  color: #ffffff;
  background: #1a1a1a;
  border-color: #1a1a1a;
  opacity: 0.92;
}

.demo-kit-link__label {
  flex-shrink: 0;
  font-weight: inherit;
  color: inherit;
}

.demo-kit-link__sep {
  flex-shrink: 0;
  opacity: 0.45;
  color: inherit;
}

.demo-kit-link__role {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  font-weight: var(--font-regular);
  color: inherit;
}

.demo-kit-link--back {
  max-width: none;
  font-weight: var(--font-regular);
  color: var(--topbar-muted);
  border-color: transparent;
  background: transparent;
}

.demo-kit-link--back:hover,
.demo-kit-link--back:focus-visible {
  color: var(--topbar-fg);
  border-color: transparent;
  background: var(--topbar-hover-bg);
  box-shadow: none;
  opacity: 1;
}

.topbar__nav-link:hover,
.topbar button.topbar__nav-link:hover,
.topbar a.topbar__nav-link:hover {
  color: var(--topbar-fg);
  background: var(--topbar-hover-bg);
}

.demo-kit-link:hover:not(.demo-kit-link--back),
.demo-kit-link:focus-visible:not(.demo-kit-link--back) {
  color: var(--color-btn-primary-fg);
  background: var(--color-btn-primary-bg);
  border-color: var(--color-btn-primary-bg);
  opacity: 0.92;
}

.topbar__nav-link:focus-visible,
.topbar button.topbar__nav-link:focus-visible,
.topbar a.topbar__nav-link:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--topbar-focus-ring);
}

.demo-kit-link:focus-visible:not(.demo-kit-link--back) {
  outline: none;
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--color-btn-primary-bg) 28%, transparent);
}

.topbar__nav-link[aria-current="page"],
.topbar a.topbar__nav-link[aria-current="page"] {
  color: var(--topbar-fg);
}

.topbar__status {
  display: inline-flex;
  align-items: center;
  max-width: min(24ch, 30vw);
  min-height: var(--topbar-item-min-h);
  padding: var(--topbar-item-pad-y) var(--topbar-item-pad-x);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-family: var(--font-body);
  font-size: var(--topbar-link-size);
  font-weight: var(--font-regular);
  line-height: 1.7;
  letter-spacing: normal;
  color: var(--topbar-muted);
}

.topbar__status[hidden] {
  display: none !important;
}

/* Download full kit — hidden on homepage; only when a kit is on screen */
#download-full-kit-btn {
  display: none !important;
}

html.topbar-show-download #download-full-kit-btn,
body[data-state="full"] #download-full-kit-btn,
body[data-state="uploaded"] #download-full-kit-btn {
  display: inline-flex !important;
}

.topbar__nav-link[hidden],
.topbar button.topbar__nav-link[hidden],
.topbar a.topbar__nav-link[hidden] {
  display: none !important;
}

/* Paid kit reading / generating: Home · My kit · Upload kit · Download full kit · theme only */
html.topbar-paid-kit .topbar [data-topbar-marketing],
body[data-state="full"] .topbar [data-topbar-marketing],
body[data-state="generating"] .topbar [data-topbar-marketing],
.app-shell.state-full .topbar [data-topbar-marketing],
.app-shell.state-generating .topbar [data-topbar-marketing] {
  display: none !important;
}

html.topbar-paid-kit .demo-kit-link:not(.demo-kit-link--back),
body[data-state="full"] .demo-kit-link:not(.demo-kit-link--back),
body[data-state="generating"] .demo-kit-link:not(.demo-kit-link--back),
.app-shell.state-full .demo-kit-link:not(.demo-kit-link--back),
.app-shell.state-generating .demo-kit-link:not(.demo-kit-link--back) {
  display: none !important;
}

.topbar .theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  gap: 0.35rem;
  width: auto;
  min-width: var(--topbar-item-min-h);
  min-height: var(--topbar-item-min-h);
  height: auto;
  padding: var(--topbar-item-pad-y) var(--topbar-item-pad-x);
  border: none;
  border-radius: var(--topbar-item-radius);
  background: transparent;
  color: var(--topbar-muted);
  cursor: pointer;
  font-family: var(--font-body);
  font-size: var(--topbar-link-size);
  font-weight: var(--font-regular);
  line-height: 1.7;
  letter-spacing: normal;
  text-transform: none;
  white-space: nowrap;
  transition:
    color 160ms ease,
    background-color 160ms ease;
}

/* Same type as My kit / Pricing — short labels, aria-label keeps full intent */
.topbar .theme-toggle::before {
  content: "Dark mode";
  display: inline-block;
  max-width: 14rem;
  overflow: hidden;
  text-overflow: ellipsis;
  font: inherit;
  line-height: inherit;
  letter-spacing: inherit;
}

[data-theme="dark"] .topbar .theme-toggle::before {
  content: "Light mode";
}

.topbar .theme-toggle:hover,
.topbar .theme-toggle:focus-visible {
  color: var(--topbar-fg);
  background: var(--topbar-hover-bg);
}

.topbar .theme-toggle:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--topbar-focus-ring);
}

.theme-toggle__icon {
  display: none;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.theme-toggle__icon svg {
  width: 16px;
  height: 16px;
  display: block;
}

[data-theme="light"] .theme-toggle__icon--moon,
html:not([data-theme]) .theme-toggle__icon--moon {
  display: inline-flex;
}

[data-theme="dark"] .theme-toggle__icon--sun {
  display: inline-flex;
}

.app-shell {
  min-height: calc(100dvh - var(--topbar-height) - env(safe-area-inset-top, 0px));
}

@media (min-width: 769px) {
  :root {
    --topbar-item-pad-x: 12px;
  }
}

@media (max-width: 768px) {
  body:has(.app-shell) .topbar {
    display: flex;
    justify-content: space-between;
    gap: var(--space-2);
    padding: env(safe-area-inset-top, 0px) max(var(--space-3), env(safe-area-inset-right, 0px)) 0
      max(var(--space-3), env(safe-area-inset-left, 0px));
  }

  body:has(.app-shell) .topbar__start {
    padding: 0;
    border-right: none;
    flex: 0 1 auto;
    min-width: 0;
  }

  body:has(.app-shell) .topbar__actions {
    padding: 0;
    flex: 1 1 auto;
    min-width: 0;
    justify-content: flex-end;
    overflow: hidden;
  }

  .topbar__nav {
    flex: 1 1 auto;
    min-width: 0;
    justify-content: flex-start;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    overscroll-behavior-x: contain;
    touch-action: pan-x;
    padding-right: var(--space-1);
    mask-image: linear-gradient(
      to right,
      #000 0,
      #000 calc(100% - 14px),
      transparent
    );
  }

  .topbar__nav .topbar__nav-link {
    flex: 0 0 auto;
  }

  .topbar__nav::-webkit-scrollbar {
    display: none;
  }

  .page-shell > .topbar {
    gap: var(--space-2);
  }

  .page-shell > .topbar .topbar__actions {
    flex: 1 1 auto;
    min-width: 0;
    overflow: hidden;
  }
}

@media (max-width: 900px) {
  /* Mid widths: theme label already short; keep icon+copy calm */
  .demo-kit-link:not(.demo-kit-link--back) {
    max-width: min(28ch, 34vw);
    padding-inline: 0.45rem;
  }
}

@media (max-width: 640px) {
  :root {
    --topbar-height: 48px;
    --topbar-pad-x: 0.65rem;
    --topbar-cluster-gap: 0.45rem;
    --topbar-nav-gap: 0.85rem;
    --topbar-item-pad-x: 0.3rem;
    --topbar-item-pad-y: 0.2rem;
    --topbar-item-min-h: 36px;
    --topbar-link-size: calc(0.75rem + 1pt);
    --topbar-logo-size: calc(0.75rem + 1pt);
  }

  .page-shell > .topbar {
    padding-inline: max(0.65rem, env(safe-area-inset-left, 0px)) max(0.65rem, env(safe-area-inset-right, 0px));
  }

  body:has(.app-shell) .topbar {
    padding: env(safe-area-inset-top, 0px) max(0.65rem, env(safe-area-inset-right, 0px)) 0
      max(0.65rem, env(safe-area-inset-left, 0px));
    gap: 0.5rem;
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
  }

  /* Flatten actions so nav can sit in the center column */
  body:has(.app-shell) .topbar__start {
    grid-column: 1;
    flex: 0 0 auto;
  }

  body:has(.app-shell) .topbar__actions {
    display: contents;
  }

  body:has(.app-shell) .topbar__nav {
    grid-column: 2;
    justify-self: stretch;
    justify-content: flex-start;
    flex: 1 1 auto;
    width: 100%;
    max-width: 100%;
    min-width: 0;
    overflow-x: auto;
    mask-image: linear-gradient(
      to right,
      #000 0,
      #000 calc(100% - 14px),
      transparent
    );
    gap: 0.85rem;
    padding-right: 0;
  }

  body:has(.app-shell) .topbar__toolbar {
    grid-column: 3;
    justify-self: end;
    gap: 0.45rem;
  }

  .logo::before {
    width: 1.35rem;
    height: 1.35rem;
    flex: 0 0 1.35rem;
  }

  .demo-kit-link {
    max-width: none;
    padding-inline: 0.3rem;
    font-size: 0.75rem;
    min-height: var(--topbar-item-min-h);
  }

  .topbar__status {
    display: none;
  }

  .logo__text,
  .logo:not(:has(.logo__text)) {
    font-size: var(--topbar-logo-size);
  }

  .topbar__nav-link,
  .topbar button.topbar__nav-link,
  .topbar a.topbar__nav-link {
    padding-inline: 0.35rem;
    font-size: var(--topbar-link-size);
    min-height: var(--topbar-item-min-h);
  }

  /* Phone: icon only — aria-label still says Switch to dark/light mode */
  .topbar .theme-toggle {
    width: var(--topbar-item-min-h);
    min-width: var(--topbar-item-min-h);
    height: var(--topbar-item-min-h);
    min-height: var(--topbar-item-min-h);
    padding: 0;
    gap: 0;
  }

  .topbar .theme-toggle::before {
    content: none;
    display: none;
  }

  .theme-toggle__icon svg {
    width: 14px;
    height: 14px;
  }

  /* Shorter Download label so My kit + Download + Back fit */
  html.topbar-show-download #download-full-kit-btn,
  body[data-state="full"] #download-full-kit-btn,
  body[data-state="uploaded"] #download-full-kit-btn {
    font-size: 0;
    letter-spacing: 0;
  }

  html.topbar-show-download #download-full-kit-btn::after,
  body[data-state="full"] #download-full-kit-btn::after,
  body[data-state="uploaded"] #download-full-kit-btn::after {
    content: "Download";
    font-size: var(--topbar-link-size);
    font-weight: inherit;
    letter-spacing: normal;
  }

  .demo-kit-link--back .demo-kit-link__label {
    font-size: 0;
  }

  .demo-kit-link--back .demo-kit-link__label::after {
    content: "← Home";
    font-size: var(--topbar-link-size);
  }

  /*
    Phone kit reading (demo / paid / kit.html):
    swap Upload kit → Download full kit so the header stays usable.
    Homepage keeps My kit + Upload kit + Demo kit.
  */
  html.topbar-show-download #upload-old-kit-btn,
  html.topbar-show-download .topbar a.topbar__nav-link[href="/?upload=kit"],
  html.topbar-show-download .topbar a.topbar__nav-link[href="?upload=kit"],
  body[data-state="full"] #upload-old-kit-btn,
  body[data-state="full"] .topbar a.topbar__nav-link[href="/?upload=kit"],
  body[data-state="full"] .topbar a.topbar__nav-link[href="?upload=kit"],
  body[data-state="uploaded"] #upload-old-kit-btn,
  body[data-state="generating"] #upload-old-kit-btn {
    display: none !important;
  }
}

@media (max-width: 480px) {
  .logo__text {
    display: none;
  }

  .logo {
    margin-left: 0;
    padding-inline: 0.25rem;
  }

  .topbar__nav-link,
  .topbar button.topbar__nav-link,
  .topbar a.topbar__nav-link {
    padding-inline: 0.45rem;
    font-size: 0.75rem;
  }
}