/* site/style.css — single stylesheet for the birthday letter.
   Palette: soft-white · warm-white · french · graphite · night · coral.
   Theme:   data-theme on <html>, OS preference by default, explicit choice wins.
   Fonts:   Google Sans Flex (body) · Cormorant Garamond (epigraph). */

/* ─── palette ─────────────────────────────────────────────────────────── */
:root {
  --soft-white: #FAFAFA;
  --warm-white: #FCFEFF;
  --french:     #ADACB5;
  --graphite:   #353A3E;
  --night:      #0F110D;
  --coral:      #FF4444;

  color-scheme: light;
}

/* ─── light mode (default) ───────────────────────────────────────────── */
:root,
:root[data-theme="light"] {
  color-scheme: light;

  --bg:           var(--warm-white);
  --bg-dim:       color-mix(in srgb, var(--graphite) 4%, var(--warm-white));

  --text:         var(--graphite);
  --text-muted:   color-mix(in srgb, var(--graphite) 55%, var(--french));
  --text-faint:   var(--french);

  --border:       color-mix(in srgb, var(--graphite) 14%, var(--warm-white));
  --border-soft:  color-mix(in srgb, var(--graphite) 8%,  var(--warm-white));

  --me:           color-mix(in srgb, var(--coral) 78%, var(--graphite));
  --me-line:      color-mix(in srgb, var(--coral) 45%, transparent);
  --me-tint:      color-mix(in srgb, var(--coral) 6%,  transparent);

  --accent:       var(--coral);
  --accent-ink:   var(--warm-white);
}

/* ─── dark mode ───────────────────────────────────────────────────────── */
:root[data-theme="dark"] {
  color-scheme: dark;

  --bg:           var(--night);
  --bg-dim:       color-mix(in srgb, var(--soft-white) 5%, var(--night));

  --text:         var(--soft-white);
  --text-muted:   var(--french);
  --text-faint:   color-mix(in srgb, var(--french) 60%, var(--night));

  --border:       color-mix(in srgb, var(--soft-white) 16%, var(--night));
  --border-soft:  color-mix(in srgb, var(--soft-white) 9%,  var(--night));

  --me:           var(--coral);
  --me-line:      color-mix(in srgb, var(--coral) 55%, transparent);
  --me-tint:      color-mix(in srgb, var(--coral) 10%, transparent);

  --accent:       var(--coral);
  --accent-ink:   var(--night);
}

/* ─── typography ─────────────────────────────────────────────────────── */
:root {
  --font-body:  "Google Sans Flex", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-quote: "Cormorant Garamond", Georgia, "Times New Roman", serif;

  --leading:   1.7;
  --measure:   34em;

  --radius:        3px;
  --radius-pill:   999px;
  --radius-music:  16px;

  --safe-top:    env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur:  200ms;
}

/* ─── reset ──────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }

body {
  min-height: 100dvh;
  background: var(--bg);
  color: var(--text);
  font: 400 1rem/var(--leading) var(--font-body);
  font-optical-sizing: auto;
  padding: 2.5rem 1.25rem calc(3rem + var(--safe-bottom));
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--dur) var(--ease),
              color            var(--dur) var(--ease);
}

/* ─── letter ─────────────────────────────────────────────────────────── */
#app { max-width: var(--measure); margin: 0 auto; }

article#letter p {
  margin: 1.35em 0;
  font-size: 1em;
}
article#letter em { font-style: italic; }
article#letter strong { font-weight: 600; }

/* epigraph — Cormorant Garamond, italic, smaller than body */
blockquote.epigraph {
  margin: 0 0 2.75rem;
  padding: 1.3rem 1.5rem;
  background: var(--bg-dim);
  border-left: 3px solid var(--me-line);
  border-radius: var(--radius);
  font-family: var(--font-quote);
  font-style: italic;
  font-weight: 400;
  font-size: 1.15rem;
  line-height: 1.5;
  letter-spacing: 0.004em;
  color: var(--text);
}
blockquote.epigraph p { margin: 0 0 0.8em; max-width: none; }
blockquote.epigraph p:last-child { margin-bottom: 0; }
blockquote.epigraph br { display: block; content: ""; margin-top: 0.45em; }

blockquote.epigraph footer {
  margin-top: 1rem;
  font-family: var(--font-body);
  font-style: normal;
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text);
  text-align: right;
}

/* greeting */
p.greeting {
  font-size: 1em;
  font-weight: 500;
  margin: 2.4rem 0 2rem !important;
}

/* note / praise */
p.pnote { font-size: 1em; }
p.praise {
  font-size: 1em;
  font-weight: 600;
  margin: 2rem 0 !important;
}

/* joined paragraphs — remove the visual gap */
p.cont { margin-top: -1.35em !important; }

/* the reader's own references — italic only, no colour change */
.me {
  font-style: italic;
  font-weight: 500;
}

/* personal message — inline, part of the paragraph, no box */
.special {
  color: var(--text);
}

/* birthday line */
p.birthday {
  margin: 2.5rem 0 1.5rem !important;
  text-align: center;
  font-weight: 500;
  font-size: 1em;
}
p.birthday :is(em, span, .accent) {
  color: var(--me);
  font-style: normal;
  font-weight: 600;
}

/* ─── music player ───────────────────────────────────────────────────── */
.music {
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-rows: auto auto;
  column-gap: 1rem;
  row-gap: 0.6rem;
  align-items: center;
  margin: 0 0 2.6rem;
  padding: 1rem 1.1rem 1.05rem;
  background: var(--bg-dim);
  border-radius: var(--radius-music);
}

.music__play {
  grid-area: 1 / 1;
  width: 56px;
  height: 56px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--coral);
  display: inline-grid;
  place-items: center;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: transform 80ms var(--ease), opacity var(--dur) var(--ease);
}
.music__play:hover  { opacity: 0.85; }
.music__play:active { transform: scale(0.95); }

.music__play svg {
  width: 100%;
  height: 100%;
  display: block;
}
.music__play .icon-pause { display: none; }
.music.is-playing .music__play .icon-play  { display: none; }
.music.is-playing .music__play .icon-pause { display: block; }

.music__title {
  grid-area: 1 / 2;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}

.music__time {
  grid-area: 1 / 3;
  font-size: 0.72rem;
  font-variant-numeric: tabular-nums;
  color: var(--text-muted);
  white-space: nowrap;
}

.music__bar {
  grid-area: 2 / 1 / 2 / -1;
  position: relative;
  height: 2px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--text) 12%, transparent);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.music__bar:focus-visible {
  outline: 2px solid var(--me);
  outline-offset: 6px;
}
.music__fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0;
  background: var(--coral);
  border-radius: inherit;
  transition: width 120ms linear;
}

/* ─── signature ──────────────────────────────────────────────────────── */
.sign-wrap { margin: 3rem 0 2rem; text-align: center; }

.sign-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  appearance: none;
  font: inherit;
  font-size: 1em;
  font-weight: 500;
  color: var(--me);
  background: transparent;
  border: 1px solid var(--me-line);
  border-radius: var(--radius-pill);
  padding: 0.6rem 1.3rem;
  cursor: pointer;
  transition: background var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              color var(--dur) var(--ease);
  -webkit-tap-highlight-color: transparent;
}
.sign-btn:hover  { background: var(--me-tint); border-color: var(--me); }
.sign-btn:active { background: var(--me-line); }
.sign-btn[disabled] {
  cursor: default;
  color: var(--me);
  border-color: var(--me-line);
  background: transparent;
}
.sign-btn[disabled]:hover { background: transparent; }

.sign-heart {
  width: 1.5em;
  height: 1.5em;
  flex: none;
  transform: translateY(0.5px);
}

.sign-note {
  margin-top: 0.85rem;
  font-size: 0.85em;
  color: var(--text-muted);
}

/* ─── states ─────────────────────────────────────────────────────────── */
.state {
  max-width: var(--measure);
  margin: 4rem auto;
  text-align: center;
  color: var(--text-muted);
  font-size: 1em;
}
.state a { color: var(--me); }

/* ─── theme toggle ───────────────────────────────────────────────────── */
.theme-toggle {
  position: fixed;
  top: max(1rem, var(--safe-top));
  right: max(1rem, env(safe-area-inset-right, 0px));
  z-index: 10;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 8px 15px 8px 13px;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  -webkit-backdrop-filter: blur(10px);
          backdrop-filter: blur(10px);
  color: var(--text);
  font: inherit;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: -0.005em;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 4px 14px -10px rgba(0, 0, 0, 0.4);
  transition: background-color var(--dur) var(--ease),
              color            var(--dur) var(--ease),
              border-color     var(--dur) var(--ease),
              transform 80ms   var(--ease);
  -webkit-tap-highlight-color: transparent;
}
.theme-toggle:active { transform: translateY(1px); }

.theme-toggle__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--graphite);
  transition: background-color var(--dur) var(--ease),
              box-shadow       var(--dur) var(--ease);
}
:root[data-theme="dark"] .theme-toggle__dot {
  background: var(--soft-white);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--soft-white) 25%, transparent);
}

/* ─── focus ──────────────────────────────────────────────────────────── */
:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--me);
  outline-offset: 3px;
  border-radius: var(--radius);
}
.theme-toggle:focus-visible,
.music__play:focus-visible,
.sign-btn:focus-visible {
  outline-offset: 2px;
  border-radius: var(--radius-pill);
}

::selection { background: var(--me-tint); color: var(--text); }

/* ─── responsive ─────────────────────────────────────────────────────── */
@media (max-width: 480px) {
  body { padding-top: 2rem; }
  blockquote.epigraph {
    padding: 1.1rem 1.2rem;
    font-size: 1.1rem;
  }
  .music { padding: 0.9rem 1rem 1rem; column-gap: 0.85rem; }
  .music__play { width: 48px; height: 48px; }
}

/* ─── reduced motion ─────────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
  .music__fill { transition: none; }
}