/* ───────── Reset & tokens ───────── */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; }

:root {
  /* Themes set: --bg, --bg-soft, --ink, --ink-soft, --rule, --accent, --accent-ink, --grain */
  --max: 880px;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow-1: 0 1px 0 rgba(0,0,0,.04), 0 10px 30px -18px rgba(0,0,0,.18);
  --shadow-2: 0 20px 50px -22px rgba(0,0,0,.28);
  --t-fast: 140ms ease;
  --t-med: 260ms cubic-bezier(.2,.7,.2,1);

  --font-serif: 'Crimson Pro', 'Iowan Old Style', 'Palatino', 'Cambria', Georgia, serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --font-ui: var(--font-sans);
}

/* ───────── Themes ───────── */
[data-theme="paper"] {
  --bg: #f4ecd8;
  --bg-soft: #ece2c8;
  --ink: #2a2418;
  --ink-soft: #6b5f47;
  --rule: rgba(42,36,24,.14);
  --accent: #b3361b;
  --accent-ink: #fff;
  --grain: .04;
}
[data-theme="cream"] {
  --bg: #faf6ef;
  --bg-soft: #f1ebde;
  --ink: #2e2a22;
  --ink-soft: #76705f;
  --rule: rgba(46,42,34,.12);
  --accent: #a8341b;
  --accent-ink: #fff;
  --grain: .03;
}
[data-theme="sepia"] {
  --bg: #e9ddc4;
  --bg-soft: #dccfb1;
  --ink: #3a2e1d;
  --ink-soft: #7a6747;
  --rule: rgba(58,46,29,.18);
  --accent: #a93c1d;
  --accent-ink: #fff;
  --grain: .05;
}
[data-theme="slate"] {
  --bg: #2c2f36;
  --bg-soft: #232529;
  --ink: #e7e2d4;
  --ink-soft: #9c9788;
  --rule: rgba(231,226,212,.14);
  --accent: #ff7a5c;
  --accent-ink: #1b1d20;
  --grain: .04;
}
[data-theme="ink"] {
  --bg: #14140f;
  --bg-soft: #0d0d0a;
  --ink: #ede5cf;
  --ink-soft: #a39c87;
  --rule: rgba(237,229,207,.13);
  --accent: #ff8e6e;
  --accent-ink: #14140f;
  --grain: .06;
}

/* ───────── Base ───────── */
html, body {
  min-height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-serif);
  font-feature-settings: 'kern','liga','onum';
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--t-med), color var(--t-med);
}

body {
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: 100dvh;
  position: relative;
  overflow-x: hidden;
}

/* paper grain — softly inked */
body::before {
  content: '';
  position: fixed; inset: 0;
  pointer-events: none;
  opacity: var(--grain);
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='240' height='240'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' seed='3'/><feColorMatrix values='0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 0.7 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
  mix-blend-mode: multiply;
  z-index: 0;
}
[data-theme="slate"] body::before,
[data-theme="ink"] body::before { mix-blend-mode: screen; }

/* ───────── Topbar ───────── */
.topbar {
  position: relative; z-index: 5;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 22px;
  border-bottom: 1px solid var(--rule);
  background: linear-gradient(180deg, color-mix(in srgb, var(--bg) 86%, transparent), transparent);
  backdrop-filter: saturate(120%) blur(6px);
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark { width: 22px; height: 22px; fill: currentColor; opacity: .85; }
.brand-name {
  font-family: var(--font-ui);
  font-weight: 600;
  letter-spacing: .01em;
  font-size: 14px;
  opacity: .85;
}
.topbar-actions { display: flex; align-items: center; gap: 4px; }

/* ───────── Buttons ───────── */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 14px;
  border-radius: 10px;
  font-family: var(--font-ui);
  font-size: 13.5px;
  font-weight: 500;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--rule);
  transition: background var(--t-fast), border-color var(--t-fast), transform var(--t-fast), color var(--t-fast);
  white-space: nowrap;
}
.btn:hover { background: color-mix(in srgb, var(--ink) 6%, transparent); }
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn svg { width: 16px; height: 16px; fill: currentColor; }

.btn.ghost { border-color: transparent; padding: 9px 11px; opacity: .75; }
.btn.ghost:hover { opacity: 1; background: color-mix(in srgb, var(--ink) 6%, transparent); }
.btn.icon-only { padding: 9px; gap: 0; }
.btn.icon-only svg { width: 18px; height: 18px; }

.btn.primary {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: transparent;
}
.btn.primary:hover { background: color-mix(in srgb, var(--accent) 90%, #000); }
.btn.primary svg { fill: var(--accent-ink); }
.btn.large { padding: 14px; }
.btn.large svg { width: 26px; height: 26px; }
.btn.danger { color: #b3361b; }

/* ───────── Stage ───────── */
.stage {
  position: relative; z-index: 1;
  display: grid;
  place-items: start center;
  width: 100%;
  padding: 36px 22px 24px;
}

/* ───────── Welcome ───────── */
.welcome {
  max-width: var(--max);
  width: 100%;
  margin: clamp(24px, 6vh, 64px) auto 0;
  text-align: center;
}
.welcome-title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(34px, 5.5vw, 56px);
  line-height: 1.05;
  letter-spacing: -.01em;
  margin: 0 0 14px;
}
.welcome-sub {
  font-family: var(--font-ui);
  color: var(--ink-soft);
  max-width: 60ch;
  margin: 0 auto 36px;
  line-height: 1.55;
  font-size: 15px;
}

.upload-card {
  position: relative;
  display: grid;
  gap: 14px;
  justify-items: center;
  padding: 38px 24px 28px;
  border: 1.5px dashed var(--rule);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--bg-soft) 60%, transparent);
  transition: border-color var(--t-fast), background var(--t-fast), transform var(--t-fast);
  cursor: pointer;
}
.upload-card:hover { border-color: color-mix(in srgb, var(--accent) 60%, var(--rule)); }
.upload-card.is-drag {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 6%, var(--bg-soft));
  transform: scale(1.005);
}
.upload-icon svg {
  width: 36px; height: 36px;
  fill: none; stroke: currentColor; stroke-width: 1.8;
  stroke-linecap: round; stroke-linejoin: round;
  opacity: .7;
}
.upload-text { display: grid; gap: 4px; line-height: 1.4; font-family: var(--font-ui); }
.upload-text strong { font-size: 17px; font-weight: 600; }
.upload-text span { color: var(--ink-soft); font-size: 14px; }
.upload-actions { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; margin-top: 6px; }
.upload-note { font-family: var(--font-ui); color: var(--ink-soft); font-size: 12px; margin: 6px 0 0; }

.welcome-tips {
  max-width: 64ch;
  margin: 32px auto 0;
  text-align: left;
  font-family: var(--font-ui);
  font-size: 14px;
  color: var(--ink-soft);
}
.welcome-tips summary {
  cursor: pointer;
  padding: 10px 0;
  border-bottom: 1px solid var(--rule);
  list-style: none;
  display: flex; align-items: center; gap: 8px;
}
.welcome-tips summary::before {
  content: '+'; font-family: var(--font-mono); width: 14px; text-align: center;
}
.welcome-tips[open] summary::before { content: '−'; }
.welcome-tips ul { padding-left: 18px; line-height: 1.65; }

/* ───────── Reader ───────── */
.reader {
  width: 100%;
  max-width: var(--max);
  display: grid;
  gap: 22px;
}
.reader-meta {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 16px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--rule);
}
.doc-title {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 18px;
  margin: 0;
  letter-spacing: .005em;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  max-width: 60%;
}
.doc-stats { font-family: var(--font-ui); font-size: 12px; color: var(--ink-soft); }

.rsvp {
  position: relative;
  padding: clamp(28px, 8vh, 70px) 14px;
  display: grid;
  place-items: center;
  text-align: center;
  min-height: 36vh;
  user-select: none;
}
.rsvp-gauge {
  position: absolute; left: 0; right: 0; top: 50%;
  display: flex; justify-content: space-between;
  pointer-events: none;
}
.rsvp-tick {
  display: block;
  width: 38%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--rule), transparent);
}
.rsvp-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: baseline;
  gap: clamp(12px, 2vw, 28px);
  font-size: 5.2rem; /* updated via JS */
  line-height: 1.1;
  font-weight: 500;
  letter-spacing: -.01em;
  width: 100%;
  max-width: 100%;
}
.rsvp-current {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  white-space: nowrap;
  color: var(--ink);
}
.rsvp-current .word-orp {
  color: var(--accent);
  position: relative;
}
[data-orp="off"] .rsvp-current .word-orp { color: inherit; }
[data-bionic="on"] .rsvp-current .word-pre { font-weight: 700; }

.rsvp-context {
  font-family: inherit;
  color: var(--ink-soft);
  opacity: .35;
  font-size: .55em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.rsvp-prev { text-align: right; }
.rsvp-next { text-align: left; }
[data-context="off"] .rsvp-context { visibility: hidden; }

.rsvp-paragraph-cue {
  position: absolute; left: 50%; transform: translateX(-50%);
  bottom: 14px;
  width: 32px; height: 2px;
  background: var(--rule);
  border-radius: 2px;
  opacity: 0;
  transition: opacity var(--t-fast);
}
.rsvp.is-paragraph .rsvp-paragraph-cue { opacity: 1; background: var(--accent); }

/* font choices */
[data-font="serif"] .rsvp-row { font-family: var(--font-serif); }
[data-font="sans"] .rsvp-row { font-family: var(--font-sans); font-weight: 600; }
[data-font="mono"] .rsvp-row { font-family: var(--font-mono); font-weight: 500; }

/* ───────── Transport / scrubber ───────── */
.transport {
  display: flex; align-items: center; justify-content: center;
  gap: 8px;
}
.transport .btn { border-color: var(--rule); }
.transport .btn.primary { box-shadow: var(--shadow-1); }
.scrubber-wrap { display: grid; gap: 6px; padding: 0 4px; }
.scrubber {
  appearance: none; -webkit-appearance: none;
  width: 100%; height: 4px;
  background: var(--rule);
  border-radius: 4px;
  outline: none;
}
.scrubber::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 1px var(--rule);
  cursor: pointer;
  transition: transform var(--t-fast);
}
.scrubber::-webkit-slider-thumb:hover { transform: scale(1.15); }
.scrubber::-moz-range-thumb {
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--accent); border: 2px solid var(--bg);
}
.scrubber-labels {
  font-family: var(--font-ui);
  font-size: 12px; color: var(--ink-soft);
  display: flex; justify-content: space-between;
}

.reader-toc {
  font-family: var(--font-ui); font-size: 13px;
  color: var(--ink-soft);
  border-top: 1px solid var(--rule);
  padding-top: 14px;
}
.reader-toc summary {
  cursor: pointer; list-style: none;
  display: flex; align-items: center; gap: 8px;
}
.reader-toc summary::before { content: '+'; font-family: var(--font-mono); }
.reader-toc[open] summary::before { content: '−'; }
.toc-list {
  display: grid; gap: 4px; margin-top: 10px;
  max-height: 240px; overflow-y: auto;
}
.toc-item {
  text-align: left; padding: 6px 10px;
  border-radius: 6px;
  cursor: pointer;
  border: 1px solid transparent;
}
.toc-item:hover { background: color-mix(in srgb, var(--ink) 6%, transparent); }
.toc-item-pos { color: var(--ink-soft); font-family: var(--font-mono); font-size: 11px; margin-right: 8px; }

/* ───────── Settings drawer ───────── */
.settings {
  position: fixed; z-index: 20;
  top: 0; right: 0; bottom: 0;
  width: min(380px, 92vw);
  background: var(--bg-soft);
  border-left: 1px solid var(--rule);
  box-shadow: var(--shadow-2);
  display: grid;
  grid-template-rows: auto 1fr auto;
  transform: translateX(100%);
  transition: transform var(--t-med);
}
.settings:not([hidden]) { transform: translateX(0); }
.settings-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--rule);
}
.settings-head h2 { font-family: var(--font-ui); font-size: 14px; font-weight: 600; margin: 0; letter-spacing: .03em; text-transform: uppercase; opacity: .7; }

.settings > .settings-group { padding: 16px 18px; border-bottom: 1px solid var(--rule); }
.settings > .settings-group:nth-of-type(2n) { /* zebra subtle */ }
.settings-label {
  display: flex; justify-content: space-between; align-items: center;
  font-family: var(--font-ui); font-size: 13.5px; font-weight: 500;
  margin-bottom: 10px;
}
.settings-label output { font-family: var(--font-mono); font-size: 12px; color: var(--ink-soft); }
.settings-group input[type="range"] { width: 100%; appearance: none; height: 4px; background: var(--rule); border-radius: 4px; }
.settings-group input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 14px; height: 14px; border-radius: 50%;
  background: var(--accent); border: 2px solid var(--bg);
}
.settings-group select {
  width: 100%; padding: 9px 11px;
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: var(--radius-sm);
}
.settings-hint {
  display: flex; justify-content: space-between;
  font-family: var(--font-mono); font-size: 11px; color: var(--ink-soft);
  margin-top: 6px;
}

.toggle-row { display: flex; align-items: center; justify-content: space-between; gap: 14px; }
.toggle-row label { display: grid; gap: 2px; font-family: var(--font-ui); font-size: 13.5px; font-weight: 500; }
.toggle-row label small { color: var(--ink-soft); font-weight: 400; font-size: 12px; }
.toggle {
  appearance: none; -webkit-appearance: none;
  width: 38px; height: 22px; flex-shrink: 0;
  border-radius: 999px;
  background: var(--rule);
  position: relative;
  cursor: pointer;
  transition: background var(--t-fast);
}
.toggle::after {
  content: ''; position: absolute;
  top: 2px; left: 2px;
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--bg);
  transition: transform var(--t-fast);
}
.toggle:checked { background: var(--accent); }
.toggle:checked::after { transform: translateX(16px); }

.theme-picker {
  display: grid; grid-template-columns: repeat(5, 1fr);
  gap: 6px;
}
.theme-swatch {
  display: grid; gap: 6px; justify-items: center;
  padding: 8px 4px 6px;
  border: 1px solid var(--rule);
  border-radius: var(--radius-sm);
  font-family: var(--font-ui); font-size: 11px; color: var(--ink-soft);
  transition: border-color var(--t-fast);
}
.theme-swatch:hover { border-color: color-mix(in srgb, var(--accent) 50%, var(--rule)); }
.theme-swatch[aria-pressed="true"] { border-color: var(--accent); color: var(--ink); }
.theme-swatch span {
  display: block; width: 22px; height: 22px;
  border-radius: 50%;
  border: 1px solid var(--rule);
}
.theme-swatch[data-theme="paper"] span { background: #f4ecd8; }
.theme-swatch[data-theme="cream"] span { background: #faf6ef; }
.theme-swatch[data-theme="sepia"] span { background: #e9ddc4; }
.theme-swatch[data-theme="slate"] span { background: #2c2f36; }
.theme-swatch[data-theme="ink"] span { background: #14140f; }

.settings-foot {
  padding: 12px 18px;
  border-top: 1px solid var(--rule);
  font-family: var(--font-ui);
  font-size: 11.5px;
  color: var(--ink-soft);
  line-height: 1.6;
}
kbd {
  font-family: var(--font-mono);
  background: color-mix(in srgb, var(--ink) 8%, transparent);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 1px 5px;
  font-size: 10.5px;
  margin: 0 1px;
}

/* ───────── Modals ───────── */
.modal {
  position: fixed; inset: 0; z-index: 30;
  display: grid; place-items: center;
  padding: 22px;
  background: color-mix(in srgb, var(--bg) 60%, transparent);
  backdrop-filter: blur(8px);
}
.modal[hidden] { display: none !important; }
.settings[hidden] { display: none !important; }
.modal-inner {
  position: relative;
  width: min(580px, 100%);
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-2);
  display: grid; gap: 14px;
  font-family: var(--font-ui);
}
.modal-x {
  position: absolute; top: 10px; right: 10px;
  width: 34px; height: 34px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 50%;
  font-size: 22px; line-height: 1;
  color: var(--ink-soft);
  background: transparent;
  border: 1px solid transparent;
  cursor: pointer;
  z-index: 1;
  transition: background var(--t-fast), color var(--t-fast), border-color var(--t-fast);
}
.modal-x:hover { background: color-mix(in srgb, var(--ink) 8%, transparent); color: var(--ink); }
.modal-x:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.modal-inner h2 { margin: 0; font-family: var(--font-serif); font-weight: 600; font-size: 24px; }
.modal-inner p { margin: 0; line-height: 1.6; color: var(--ink-soft); font-size: 14.5px; }
.modal-inner p b { color: var(--ink); }
.modal-inner code {
  font-family: var(--font-mono); font-size: 12.5px;
  background: color-mix(in srgb, var(--ink) 8%, transparent);
  padding: 1px 5px; border-radius: 4px;
}
.modal-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 4px; }

#paste-area {
  width: 100%; min-height: 280px;
  padding: 14px 16px;
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: var(--radius-sm);
  font-family: var(--font-serif);
  font-size: 16px;
  line-height: 1.55;
  resize: vertical;
  color: var(--ink);
}
#paste-area:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

.library-inner { max-width: 640px; }
.library-sub { font-family: var(--font-ui); font-size: 13px; color: var(--ink-soft); margin-top: -4px; }
.library-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 6px; max-height: 50vh; overflow-y: auto; }
.library-item {
  display: grid; grid-template-columns: 1fr auto; gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--rule);
  border-radius: var(--radius-sm);
  background: var(--bg);
  align-items: center;
}
.library-item-main { display: grid; gap: 2px; min-width: 0; }
.library-item-title {
  font-family: var(--font-serif); font-size: 17px;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.library-item-meta { font-family: var(--font-ui); font-size: 12px; color: var(--ink-soft); }
.library-item-actions { display: flex; gap: 4px; }
.library-empty { font-family: var(--font-ui); color: var(--ink-soft); text-align: center; padding: 20px; }

/* ───────── Ad strip ───────── */
.adstrip {
  position: relative; z-index: 2;
  border-top: 1px solid var(--rule);
  background: color-mix(in srgb, var(--bg-soft) 70%, transparent);
  padding: 8px 16px 10px;
}
.adstrip-inner {
  max-width: 1100px; margin: 0 auto;
  display: grid; gap: 4px;
  grid-template-columns: 1fr auto;
  align-items: center;
}
.ad-slot {
  min-height: 60px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--ink) 4%, transparent);
  border: 1px solid var(--rule);
  overflow: hidden;
}
.ad-placeholder {
  display: flex; align-items: center; gap: 12px;
  font-family: var(--font-ui); font-size: 12.5px; color: var(--ink-soft);
}
.ad-marker {
  font-family: var(--font-mono); font-size: 10px;
  padding: 2px 6px; border-radius: 4px;
  background: color-mix(in srgb, var(--ink) 10%, transparent);
  letter-spacing: .08em; text-transform: uppercase;
}
.adstrip-meta {
  font-family: var(--font-ui); font-size: 11.5px; color: var(--ink-soft);
  display: flex; align-items: center; gap: 6px;
  padding-left: 12px;
}
.adstrip-meta a { color: inherit; text-decoration: none; border-bottom: 1px dotted currentColor; }
.adstrip-meta .dot { opacity: .5; }

/* ───────── Toast ───────── */
.toast {
  position: fixed; left: 50%; bottom: 90px;
  transform: translateX(-50%);
  background: var(--ink); color: var(--bg);
  font-family: var(--font-ui); font-size: 13px;
  padding: 9px 14px; border-radius: 999px;
  z-index: 40;
  box-shadow: var(--shadow-2);
  opacity: 0;
  transition: opacity var(--t-fast), transform var(--t-fast);
}
.toast.show { opacity: 1; transform: translate(-50%, -6px); }

/* ───────── View switching ───────── */
[data-view="welcome"] #reader { display: none; }
[data-view="reader"] #welcome { display: none; }

/* ───────── Responsive ───────── */
@media (max-width: 640px) {
  .topbar { padding: 10px 14px; }
  .brand-name { display: none; }
  .topbar-actions .btn span { display: none; }
  .topbar-actions .btn { padding: 9px; }
  .stage { padding: 20px 14px 16px; }
  .welcome-title { font-size: 36px; }
  .rsvp-row { font-size: 3.6rem; }
  .adstrip-inner { grid-template-columns: 1fr; }
  .adstrip-meta { justify-content: center; padding-left: 0; }
  .upload-card { padding: 28px 16px 22px; }
}

@media (max-width: 380px) {
  .rsvp-row { font-size: 2.8rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0ms !important; animation: none !important; }
}