/* ==========================================================
   Font: Inter (SIL Open Font License), hosted in assets/fonts/ rather than
   loaded from Google, so pages don't wait on a second server. Two files:
   plain Latin, and accented Latin, which only downloads if a page needs it.
   "Inter Fallback" is Arial resized to Inter's proportions, so text doesn't
   jump when Inter arrives a moment after the page first shows.
   ========================================================== */
@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url(/assets/fonts/inter-latin-v20.woff2) format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url(/assets/fonts/inter-latin-ext-v20.woff2) format("woff2");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: "Inter Fallback";
  src: local("Arial"), local("Helvetica Neue"), local("Helvetica");
  size-adjust: 107.12%;
  ascent-override: 90.44%;
  descent-override: 22.52%;
  line-gap-override: 0%;
}

/* ==========================================================
   Design tokens — change these to restyle the whole site.
   Light values here; dark values in the block below, which applies
   when <html data-theme="dark"> (set by the switch, see theme.js).
   ========================================================== */
:root {
  color-scheme: light;      /* native scrollbars and form controls match */
  --bg: #ffffff;
  --tile: #f7f7f9;          /* light grey tile, same as marco.fyi */
  --text: #111111;
  --muted: #6b6b73;
  --body-text: #4a4a52;     /* longer paragraphs */
  --line: #e7e7ec;
  --outline: #d7d7dd;       /* arrow circles, outlined boxes */
  --card: #ffffff;          /* raised surfaces inside tiles */
  --on-text: #ffffff;       /* text on dark buttons (buttons use --text as background) */
  --glass: rgba(255, 255, 255, .85);   /* frosted pills: nav, captions */
  --glass-active: #eeeef1;  /* highlighted item in the nav */
  --shadow: rgba(0, 0, 0, .18);
  --hover-ring: transparent;           /* dark mode adds a faint outline on hover */
  --dark-tile-edge: transparent;       /* dark mode outlines the always-dark tiles */
  --accent: #2fd08a;        /* green, from Sam's logo */
  --font-system: -apple-system, BlinkMacSystemFont, "SF Pro Text", system-ui, "Inter", sans-serif; /* San Francisco on Apple devices */
  --ss-sidebar: #efeff2;    /* Settings-style sidebar */
  --ss-hover: rgba(0, 0, 0, .06);
  --ss-select: #0071e3;     /* Apple blue that passes 4.5:1 with white text */
  --apple-blue: #007aff;    /* Apple system colours, for Settings-style icons */
  --apple-orange: #ff9500;
  --apple-teal: #30b0c7;
  --apple-green: #34c759;
  --apple-purple: #af52de;
  --apple-pink: #ff2d55;
  --badge: #ff3b30;         /* Apple's system red: the Newsletter link's unread dot */
  --radius: 32px;           /* tile corners */
  --tile-pad: 32px;         /* default space inside a tile */
  --gap: 16px;
  --font: "Inter", "Inter Fallback", system-ui, -apple-system, sans-serif;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --badge: #ff453a;         /* system red, dark-mode version */
  --bg: #0e0e10;            /* near-black: softer on the eyes than pure black */
  --tile: #1a1a1d;
  --text: #f2f2f4;
  --muted: #9d9da6;
  --body-text: #c6c6ce;
  --line: #2e2e33;
  --outline: #3a3a41;
  --card: #26262b;
  --on-text: #0e0e10;
  --glass: rgba(34, 34, 38, .8);
  --glass-active: #34343a;
  --shadow: rgba(0, 0, 0, .5);
  --hover-ring: rgba(255, 255, 255, .14);
  --dark-tile-edge: rgba(255, 255, 255, .08);
  --ss-sidebar: #232327;
  --ss-hover: rgba(255, 255, 255, .07);
}

/* The light/dark cross-fade (theme.js runs it as a View Transition) */
::view-transition-old(root),
::view-transition-new(root) { animation-duration: .35s; }

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

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

/* Words for screen readers only: off screen, but still read out */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}
img { display: block; max-width: 100%; }
ul { list-style: none; }

/* ==========================================================
   Floating pill navigation
   ========================================================== */
.nav {
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  gap: 2px;
  padding: 4px;
  background: var(--glass);
  backdrop-filter: blur(12px);           /* frosted-glass effect */
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--line);
  border-radius: 999px;
  box-shadow: 0 10px 10px -5px rgba(0, 0, 0, 0.1);
  font-family: var(--font);              /* same on every page, whatever the page's own font */
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
  transition: color .2s, background .2s;
}
.nav-link:hover { color: var(--text); }
.nav-link.is-active { background: var(--glass-active); color: var(--text); font-weight: 600; }

/* Unread dot on the Newsletter link, added by nav-badge.js when there's an issue the
   visitor hasn't seen. It sits on the top-right corner of the word; the negative margins
   cancel out the room it takes, so the nav doesn't change width when it appears. */
.nav-link.has-news::after {
  content: '';
  align-self: flex-start;
  width: 6px; height: 6px;
  margin: -1px -7px 0 -5px;
  border-radius: 50%;
  background: var(--badge);
}

/* ==========================================================
   Light/dark switch — top left, styled to match the nav pill
   ========================================================== */
.theme-toggle {
  position: fixed;
  top: 28px;              /* 42px tall, so this centres it on the 51px nav pill (which starts at 24px) */
  left: 24px;
  z-index: 10;
  width: 42px;            /* same height as the highlighted link inside the nav */
  height: 42px;
  display: grid;
  place-items: center;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 10px 10px -5px rgba(0, 0, 0, 0.1);
  color: var(--text);
  cursor: pointer;
  transition: transform .2s ease;
}
.theme-toggle:hover { transform: rotate(-12deg); }
.theme-toggle:focus-visible { outline: 2px solid var(--text); outline-offset: 2px; }
.theme-toggle svg { width: 18px; height: 18px; }
.icon-sun,
:root[data-theme="dark"] .icon-moon { display: none; }
:root[data-theme="dark"] .icon-sun { display: block; }

/* Spotlight's search button (spotlight.js): phones only, at the right end of the nav pill,
   mirroring the light/dark switch at the left. Laptops press ⌘K or / instead. */
.nav-search { display: none; }

/* ==========================================================
   Page + bento grid
   ========================================================== */
.page {
  max-width: 1400px;
  margin: 0 auto;
  padding: 110px 16px 40px;
}

/* 4 equal columns; rows are roughly square on a laptop screen */
.grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-auto-rows: clamp(260px, 23vw, 330px);
  grid-auto-flow: dense;   /* lets small tiles fill gaps left by big ones */
  gap: var(--gap);
}
::view-transition-group(*) { animation-duration: .5s; animation-timing-function: cubic-bezier(.2, .9, .3, 1); }

/* ==========================================================
   Base tile
   ========================================================== */
.tile {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: var(--tile-pad);
  background: var(--tile);
  border-radius: var(--radius);
  overflow: hidden;
}

/* Tiles that are links get a subtle hover */
a.tile { transition: transform .3s ease, box-shadow .3s ease; }
a.tile:hover {
  transform: translateY(-3px);
  box-shadow: 0 0 0 1px var(--hover-ring), 0 16px 32px -16px var(--shadow);
}

/* Shared text styles */
.label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
}
.small  { font-size: 14px; color: var(--muted); line-height: 1.55; }
.small strong { color: var(--text); }
.tile-app-icon { flex-shrink: 0; width: 20px; height: 20px; border-radius: 5px; }
.tile-heading { font-size: 24px; font-weight: 600; line-height: 1.2; letter-spacing: -0.01em; }

.button {
  align-self: flex-start;
  margin-top: auto;
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--text);
  color: var(--on-text);
  font-size: 13px;
  font-weight: 600;
}

/* Show the map that matches the theme (the hidden one isn't downloaded) */
.fm-map--dark,
:root[data-theme="dark"] .fm-map--light { display: none; }
:root[data-theme="dark"] .fm-map--dark { display: block; }
.fm-map {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;          /* findmy.js assumes this when placing the pin */
}

/* Compass and zoom buttons, bottom-right (just for show) */
.fm-controls {
  position: absolute;
  right: 12px; bottom: 12px;
  display: flex;
  align-items: flex-end;
  gap: 6px;
  color: var(--fm-text);
  font-size: 13px;
  font-weight: 600;
}
.fm-compass,
.fm-zoom {
  background: var(--fm-button);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 2px 8px rgba(0, 0, 0, .25);
}
.fm-compass {
  width: 30px; height: 30px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border-top: 2px solid #ff453a;   /* the red "north" tick */
}
.fm-zoom {
  display: flex;
  flex-direction: column;
  width: 28px;
  border-radius: 14px;
  text-align: center;
  font-size: 16px;
  font-weight: 400;
  line-height: 26px;
}
.fm-zoom span + span { border-top: 1px solid var(--fm-divider); }

.fm-legal {
  position: absolute;
  top: 8px; right: 12px;
  font-size: 9px;
  color: var(--fm-text-2);
}
.fm-legal:hover { color: var(--fm-text); }

/* 404 page: its own styles are in lost.css. The soft button is shared. */
.button--soft { background: var(--card); color: var(--text); box-shadow: inset 0 0 0 1px var(--line); }
/* The Books app's orange icon, also used on /books */
.bk-glyph { flex-shrink: 0; width: 24px; height: 24px; display: grid; place-items: center; border-radius: 6px; background: var(--apple-orange); }
.bk-glyph svg { width: 15px; height: 15px; fill: none; stroke: #fff; stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; }

/* ==========================================================
   Responsive: smaller laptops, tablet (2 columns) and phone (1 column)
   ========================================================== */
/* Smaller laptops: tiles are narrower, so tighten the spacing inside them */
@media (max-width: 1300px) {
  :root { --tile-pad: 24px; }
}

/* Below ~1180px four columns get too narrow for the text tiles, so switch to two */
@media (max-width: 1180px) {
  .grid { grid-template-columns: repeat(2, 1fr); grid-auto-rows: minmax(280px, auto); }   /* rows grow to fit here, so fix the height and let the inbox scroll */
}

/* Narrower screens: slimmer nav links so the nav never touches the light/dark switch */
@media (max-width: 760px) {
  .nav-link { padding: 10px 14px; }
}

@media (max-width: 640px) {
  :root { --radius: 24px; }
  .page { padding-top: 88px; }
  /* One centred pill: theme.js moves the light/dark switch inside the nav, before the links */
  .nav { top: 16px; align-items: center; }
  .nav-link { padding: 8px 6px; font-size: 12px; }
  .nav + .theme-toggle { visibility: hidden; }   /* not moved in yet: hide it rather than overlap the nav */
  .nav .theme-toggle {
    position: relative;
    top: 0; left: 0;                /* undo the corner position it has on wide screens */
    width: 34px; height: 34px;      /* same height as the links */
    margin-right: 5px;              /* room for the divider */
    border: 0;
    background: none;
    box-shadow: none;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
  .nav .theme-toggle svg { width: 17px; height: 17px; }
  .nav .theme-toggle::after {       /* thin divider between the switch and the links */
    content: "";
    position: absolute;
    right: -3px; top: 9px; bottom: 9px;
    width: 1px;
    background: var(--outline);
  }
  .nav-search {
    display: grid;
    place-items: center;
    position: relative;
    width: 34px; height: 34px;
    margin-left: 5px;               /* room for the divider */
    padding: 0;
    border: 0;
    border-radius: 50%;
    background: none;
    color: var(--text);
    cursor: pointer;
  }
  .nav-search svg { width: 17px; height: 17px; fill: none; stroke: currentColor; stroke-width: 2.4; stroke-linecap: round; }
  .nav-search:focus-visible { outline: 2px solid var(--text); outline-offset: -2px; }
  .nav-search::before {             /* divider between the links and the button */
    content: "";
    position: absolute;
    left: -3px; top: 9px; bottom: 9px;
    width: 1px;
    background: var(--outline);
  }
  .grid { grid-template-columns: 1fr; grid-auto-rows: minmax(260px, auto); }
}

/* Most phones: slimmer links and buttons so the pill, with the switch and the search
   button at either end, keeps a gap from the screen edges */
@media (max-width: 440px) {
  .nav-link { padding: 8px 5px; }
  .nav .theme-toggle, .nav-search { width: 32px; }
}
@media (max-width: 389px) {
  .nav-link { padding: 8px 4px; }
}

/* Very small phones: drop the "Home" link (you're already on it) so the nav fits beside the switch */
@media (max-width: 374px) {
  .nav-link[href="/"] { display: none; }
  .nav-link { padding: 8px 3px; }
}

/* Respect people who've asked their device to reduce motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}