/* ==========================================================================
   Shared styles + home page.   (Gallery-only styles live in gallery.css)

   Palette
   #FFFFFC white   #3B3E40 grey   #FC2A17 red   #4BB3FD blue
   ========================================================================== */


/* 1. Tokens
   ========================================================================== */
:root {
  --bg: #ffffff;
  --text: #3B3E40;
  --accent: #FC2A17;
  --footer-bg: #161616;
  --footer-text: #FFFFFC;
}

:root[data-theme="dark"] {
  --bg: #161616;
  --text: #FFFFFC;
}


/* 2. Base
   ========================================================================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: "DM Mono", monospace;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

a {
  color: var(--text);
  text-decoration: none;
}

ul {
  list-style: none;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.accent {
  color: var(--accent);
}

section {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
  min-height: 100vh;
  min-height: 100svh;
  padding: 24px;
  scroll-margin-top: 70px; /* keeps content clear of the fixed header */
}


/* 3. Header / navigation
   ========================================================================== */
header {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 10;
  width: 100%;
  background: color-mix(in srgb, var(--bg) 20%, transparent);
}

.site-nav {
  display: flex;
  flex-wrap: wrap; /* last-resort fallback on very narrow screens */
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  padding: 16px 24px 12px;
}

.site-nav ul {
  display: flex;
  gap: 24px;
  font-size: 0.8em;
}

.site-nav a:hover,
.theme-toggle:hover {
  color: var(--accent);
}

.site-nav .site-name {
  color: var(--accent);
}

.site-nav .site-name:hover {
  color: var(--text);
}

/* The link for the section you are on is struck through */
.site-nav li a[aria-current] {
  text-decoration: line-through;
  text-decoration-thickness: 1px;
}

.theme-toggle {
  padding: 0;
  border: none;
  background: none;
  color: var(--text);
  font: inherit;
  letter-spacing: inherit;
  text-transform: inherit;
  cursor: pointer;
}


/* 4. Home: drawing board
   ========================================================================== */
#home {
  position: relative;
  padding: 0;
}

canvas {
  display: block;
  width: 100%;
  height: 100vh;
  height: 100svh;
  background: #fff; /* inverted in dark mode (see below), which gives a near-black page */
  cursor: url("images/cursorPen.png") 10 52, crosshair;
  touch-action: none; /* lets touch / pen draw instead of scroll */
}

/* On touch screens the board starts in "scroll" mode so it never traps the page.
   The Draw button (and the nav) switch modes. See script.js. */
canvas[data-mode="scroll"] {
  touch-action: pan-y pinch-zoom;
}

:root[data-theme="dark"] canvas {
  filter: invert(0.91);
}

#home .overlay {
  position: absolute;
  top: 70%;
  left: 45vw;
  z-index: 10;
  max-width: min(28rem, 40vw);
  transform: translateY(-50%);
  pointer-events: none; /* the canvas still receives mouse / touch events */
}

.hint-touch {
  display: none;
}

.draw-toggle {
  display: none; /* touch screens only, see media query below */
  position: absolute;
  right: 16px;
  bottom: 16px;
  z-index: 11;
  min-height: 44px; /* comfortable touch target */
  padding: 10px 18px;
  border: 1px solid currentColor;
  background: var(--bg);
  color: var(--text);
  font: inherit;
  font-size: 0.8rem;
  letter-spacing: inherit;
  text-transform: inherit;
  cursor: pointer;
}

/* Hidden once the board is mostly off screen, so it never covers the nav */
.draw-toggle.is-offscreen {
  visibility: hidden;
  pointer-events: none;
}

@media (hover: none) and (pointer: coarse) {
  .draw-toggle { display: block; }
  .hint-pointer { display: none; }
  .hint-touch { display: inline; }
}


/* 5. About
   ========================================================================== */
.about {
  position: relative; /* the gallery arrow is positioned against this */
  overflow-x: clip;   /* hides the slide-in animation without creating a scroll box */
}

.about > * {
  flex: 1 1 300px;
}

.tagline {
  align-self: center;
  max-width: 60ch;
  font-size: clamp(1.6rem, 5.5vw + 0.5rem, 4rem);
  font-weight: 500;
  opacity: 0; /* revealed by script.js */
}

.tagline.is-visible {
  opacity: 1;
}

.about-row {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: clamp(2rem, 14.5vw, 13rem);
  width: 100%;
}

.about-figure {
  position: relative; /* anchors the caption */
  flex: 0 0 auto;
  align-self: center;
  width: min(300px, 100%);
}

.about-figure figcaption {
  position: absolute;
  bottom: 0;
  left: 100%;
  padding: 10px 6px;
  background: var(--bg);
  color: var(--text);
  font-size: 12px;
  white-space: nowrap;
  writing-mode: vertical-rl;
  transform: translateX(-50%) rotate(180deg); /* reads bottom-to-top */
}

.blurb {
  flex: 1 1 0;
  min-width: 0;
  max-width: 40ch;
  align-self: flex-start;
  margin-top: -8rem; /* pulls the text up beside the image; adjust to taste */
  font-size: 1rem;
  font-weight: 400;
}

.gallery-arrow {
  position: absolute;
  top: 70%;
  right: 24px;
  display: inline-flex;
  align-items: center;
  gap: 16px;
  transform: translateY(-50%);
  transition: transform 0.3s, color 0.3s;
}

.gallery-arrow svg {
  transition: transform 0.3s;
}

@media (hover: hover) {
  .gallery-arrow:hover {
    color: var(--accent);
    transform: translateY(-50%) translateX(8px);
  }

  .gallery-arrow:hover svg {
    transform: translateX(8px);
  }
}


/* 6. Footer
   ========================================================================== */
footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding: 24px;
  background: var(--footer-bg);
  font-size: 0.7em;
}

footer ul {
  display: flex;
  gap: 24px;
}

footer a,
footer p {
  color: var(--footer-text);
}

footer a:hover {
  color: var(--accent);
}


/* 7. Responsive
   Desktop (~1440px) is the default above. These adapt it down to 375px.
   ========================================================================== */

/* Small laptops / tablets: the arrow joins the page flow instead of floating,
   so it can't overlap the text */
@media (max-width: 1100px) {
  .gallery-arrow {
    position: static;
    align-self: flex-end;
    transform: none;
  }

  @media (hover: hover) {
    .gallery-arrow:hover { transform: translateX(8px); }
  }
}

/* Tablets and phones */
@media (max-width: 800px) {
  .site-nav {
    gap: 8px 16px;
    padding: 14px 16px 10px;
  }

  .site-nav ul {
    gap: 14px;
  }

  .site-nav .site-name {
    font-size: 0.85em;
  }

  #home .overlay {
    top: 60%;
    right: 0;
    left: 0;
    max-width: none;
    text-align: center;
  }

  section {
    padding: 20px 16px;
  }

  .about {
    align-items: stretch;
    justify-content: flex-start;
    gap: 32px;
    padding-top: 96px;
    padding-bottom: 48px;
  }

  .about > * {
    flex: 0 1 auto; /* no stretching on small screens */
  }

  .tagline {
    align-self: auto;
  }

  .about-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 24px;
  }

  .about-figure {
    align-self: flex-start;
  }

  /* The rotated side caption becomes a normal line under the image */
  .about-figure figcaption {
    position: static;
    padding: 8px 0 0;
    writing-mode: horizontal-tb;
    white-space: normal;
    transform: none;
  }

  .blurb {
    align-self: auto;
    margin-top: 0;
  }

  .gallery-arrow {
    align-self: flex-start;
  }
}

/* Phones (375px and up) */
@media (max-width: 480px) {
  .gallery-arrow span {
    font-size: 0.8rem;
  }

  footer {
    padding: 20px 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}