/* =============================================================
 * style.css — Semiotic AI Translator (research prototype)
 * Tool-style restraint: calm surfaces, one accent, high contrast.
 * ============================================================= */

:root {
  --bg:          #eef1f5;
  --surface:     #ffffff;
  --surface-2:   #f6f8fb;
  --ink:         #1c2330;
  --ink-soft:    #5a6473;
  --ink-faint:   #8a94a3;
  --line:        #dce2ea;
  --accent:      #3a6df0;
  --accent-soft: #e7eefe;
  --ai-bg:       #141a26;
  --ai-bg-2:     #1d2533;
  --ai-line:     #2c3647;
  --ai-ink:      #e7ecf4;
  --ai-ink-soft: #9aa6bb;
  --ai-glow:     #5b8cff;
  --good:        #2fae66;
  --warn:        #e0883a;
  --radius:      14px;
  --radius-sm:   10px;
  --shadow:      0 1px 2px rgba(20,26,38,.05), 0 8px 24px rgba(20,26,38,.06);
  --font:        "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono:        "JetBrains Mono", ui-monospace, "SFMono-Regular", monospace;
}

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

html, body { height: 100%; }

body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ---------- Header ---------- */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 24px;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}
.app-header h1 { font-size: 19px; font-weight: 700; letter-spacing: -.02em; line-height: 1.1; }
.header-left { display: flex; align-items: center; gap: 10px; }
.header-left .brand-text { margin-left: 8px; }
.app-subtitle { font-size: 11.5px; color: var(--ink-soft); margin-top: 3px; letter-spacing: .01em; }
.header-tag {
  font-size: 10.5px;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 10px;
  border-radius: 999px;
  letter-spacing: .02em;
}
.header-right { display: flex; align-items: center; gap: 14px; }
.header-back {
  font-size: 12px;
  font-weight: 600;
  color: var(--ink-soft);
  text-decoration: none;
  padding: 5px 0;
  transition: color .12s ease;
}
.header-back:hover { color: var(--accent); }

/* ---------- Workspace (3 columns) ---------- */
.workspace {
  flex: 1;
  display: grid;
  grid-template-columns: 18% 1fr 32%;
  gap: 18px;
  padding: 18px 22px;
  min-height: 0;
}
.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  min-height: 0;
}
.panel-head { padding: 18px 18px 12px; }
.panel-head h2 { font-size: 14px; font-weight: 700; letter-spacing: -.01em; }
.panel-sub { font-size: 12px; color: var(--ink-soft); margin-top: 3px; line-height: 1.4; }

/* ---------- Left: Library ---------- */
.panel-left { overflow: hidden; }
.library {
  overflow-y: auto;
  padding: 14px 12px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.lib-cat {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .09em;
  color: var(--ink-faint);
  padding: 12px 4px 4px;
}
.lib-cat:first-child { padding-top: 2px; }
.lib-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 7px;
}
.lib-item {
  aspect-ratio: 1 / 1;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: grab;
  user-select: none;
  transition: transform .12s ease, border-color .12s ease, box-shadow .12s ease;
}
.lib-item:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(58,109,240,.12);
}
.lib-item:active { cursor: grabbing; transform: scale(.95); }
.lib-item .emoji { font-size: 26px; line-height: 1; }

/* ---------- Center: Canvas ---------- */
.panel-center { overflow: hidden; }
.canvas-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 18px 10px;
}
.btn {
  font-family: var(--font);
  font-size: 12.5px;
  font-weight: 600;
  border-radius: 9px;
  padding: 8px 14px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background .12s ease, border-color .12s ease, color .12s ease;
}
.btn-ghost {
  background: var(--surface);
  border-color: var(--line);
  color: var(--ink-soft);
}
.btn-ghost:hover { border-color: var(--warn); color: var(--warn); }
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: #2f5fde; border-color: #2f5fde; }

.canvas {
  position: relative;
  flex: 1;
  margin: 4px 18px;
  border-radius: var(--radius-sm);
  background-color: var(--surface-2);
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 26px 26px;
  border: 1px dashed var(--line);
  overflow: hidden;
  min-height: 0;
  transition: border-color .15s ease, background-color .15s ease;
}
.canvas.drag-over {
  border-color: var(--accent);
  background-color: var(--accent-soft);
}

.canvas-hint {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  color: var(--ink-faint);
  pointer-events: none;
  text-align: center;
  padding: 20px;
}
.canvas-hint.hidden { display: none; }
.hint-icon { font-size: 34px; opacity: .5; }
.canvas-hint p { font-size: 13px; }
.hint-sub { font-size: 18px; letter-spacing: 4px; opacity: .8; }

/* placed symbol token — frameless, free-floating */
.token {
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 58px;
  height: 58px;
  font-size: 40px;
  line-height: 1;
  background: transparent;
  border: none;
  box-shadow: none;
  cursor: grab;
  user-select: none;
  touch-action: none;
  transition: transform .15s ease, filter .15s ease;
}
.token:active { cursor: grabbing; }
.token .token-remove {
  position: absolute;
  top: -7px; right: -7px;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--ink);
  color: #fff;
  font-size: 12px;
  line-height: 18px;
  text-align: center;
  border: none;
  cursor: pointer;
  opacity: 0;
  transition: opacity .12s ease;
}
.token:hover .token-remove { opacity: 1; }
.token.focused {
  transform: scale(1.12);
  animation: tokenGlow 1.4s ease-in-out infinite;
}
@keyframes tokenGlow {
  0%,100% { filter: drop-shadow(0 0 5px rgba(91,140,255,.55)); }
  50%     { filter: drop-shadow(0 0 11px rgba(91,140,255,.85)); }
}

/* ---------- Tag strip (inside dark AI panel) ---------- */
.tag-strip {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 20px;
  border-bottom: 1px solid var(--ai-line);
  flex-wrap: wrap;
}
.tag-strip-label {
  font-family: var(--mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: .08em;
  font-weight: 600;
  color: var(--ai-ink-soft);
  padding-top: 4px;
  flex-shrink: 0;
}
.tag-list { display: flex; gap: 6px; flex-wrap: wrap; }
.tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 12px;
  background: var(--ai-bg-2);
  color: var(--ai-ink);
  border: 1px solid var(--ai-line);
  border-radius: 999px;
  padding: 4px 10px;
  font-weight: 500;
}
.tag .t-emoji { font-size: 13px; }
.tag-empty { font-size: 12px; color: var(--ai-ink-soft); font-style: italic; padding-top: 3px; }

/* ---------- Right: AI panel (dark) ---------- */
.panel-right {
  background: var(--ai-bg);
  border-color: var(--ai-line);
  color: var(--ai-ink);
  overflow: hidden;
}
.ai-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 18px 20px 14px;
  border-bottom: 1px solid var(--ai-line);
}
.ai-head h2 { font-size: 14px; font-weight: 700; color: var(--ai-ink); }
.ai-dot {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--ai-glow);
  box-shadow: 0 0 0 0 rgba(91,140,255,.5);
  animation: aiPulse 2s infinite;
}
@keyframes aiPulse {
  0%   { box-shadow: 0 0 0 0 rgba(91,140,255,.5); }
  70%  { box-shadow: 0 0 0 8px rgba(91,140,255,0); }
  100% { box-shadow: 0 0 0 0 rgba(91,140,255,0); }
}
.ai-body {
  flex: 1;
  overflow-y: auto;
  padding: 18px 20px 22px;
}
.ai-idle { color: var(--ai-ink-soft); }
.ai-idle-title { font-size: 13px; font-weight: 600; color: var(--ai-ink); margin-bottom: 6px; }
.ai-idle-text { font-size: 12.5px; line-height: 1.6; }

/* typing indicator */
.ai-typing {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ai-ink-soft);
}
.ai-typing .dots { display: inline-flex; gap: 4px; }
.ai-typing .dots span {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--ai-glow);
  animation: blink 1.2s infinite;
}
.ai-typing .dots span:nth-child(2) { animation-delay: .2s; }
.ai-typing .dots span:nth-child(3) { animation-delay: .4s; }
@keyframes blink { 0%,80%,100% { opacity: .25; } 40% { opacity: 1; } }

/* result — one primary translation + two secondary readings */
.ai-result { animation: fadeUp .35s ease both; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

/* primary: the loudest element in the panel */
.translation {
  font-size: 20px;
  line-height: 1.5;
  color: var(--ai-ink);
  font-weight: 600;
  letter-spacing: -.01em;
}

/* secondary: tappable choice cards — a higher-priority element */
.options-block {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--ai-line);
}
.options-lead {
  font-size: 11px;
  font-family: var(--mono);
  letter-spacing: .03em;
  color: var(--ai-ink-soft);
  margin: 0 0 12px;
  transition: color .2s ease;
}

.options { display: flex; flex-direction: column; gap: 9px; }
.option {
  display: flex;
  align-items: flex-start;
  gap: 11px;
  width: 100%;
  text-align: left;
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.45;
  color: var(--ai-ink);
  background: var(--ai-bg-2);
  border: 1px solid var(--ai-line);
  border-radius: var(--radius-sm);
  padding: 13px 14px;
  cursor: pointer;
  transition: border-color .15s ease, background .15s ease, transform .1s ease;
}
.option:hover {
  border-color: var(--ai-glow);
  background: #232d3d;
}
.option:active { transform: scale(.99); }

/* the radio dot that fills in when chosen */
.option-tick {
  flex-shrink: 0;
  width: 14px; height: 14px;
  margin-top: 3px;
  border: 1.5px solid var(--ai-ink-soft);
  border-radius: 50%;
  transition: border-color .15s ease, background .15s ease;
}
.option-text { flex: 1; }

/* chosen state — solid fill, no checkmark (simulated "the AI learned this") */
.option.is-chosen {
  border-color: var(--ai-glow);
  background: var(--ai-glow);
  color: #fff;
}
.option.is-chosen .option-tick {
  border-color: #fff;
  background: #fff;
}

/* micro disclaimer pinned to the bottom of the AI panel */
.ai-disclaimer {
  margin: 0;
  padding: 11px 20px 14px;
  border-top: 1px solid var(--ai-line);
  font-size: 10.5px;
  line-height: 1.4;
  font-style: italic;
  color: var(--ai-ink-soft);
  opacity: .75;
}

/* ---------- Footer (blends into the gray page background) ---------- */
.app-footer {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px 28px 16px;
  background: transparent;
  border: none;
  font-size: 11.5px;
  color: #9aa3b2;
}
.footer-note { font-style: italic; }

/* ---------- Scrollbars ---------- */
.library::-webkit-scrollbar, .ai-body::-webkit-scrollbar { width: 8px; }
.library::-webkit-scrollbar-thumb { background: var(--line); border-radius: 8px; }
.ai-body::-webkit-scrollbar-thumb { background: var(--ai-line); border-radius: 8px; }

/* ---------- Responsive fallback ---------- */
@media (max-width: 1024px) {
  .workspace { grid-template-columns: 1fr; grid-auto-rows: minmax(220px, auto); }
  .canvas { min-height: 320px; }
}

/* =============================================================
 * Landing page (index.html) — compact, fits within one screen
 * ============================================================= */
body.landing {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: var(--bg);
}

/* nav */
.lp-nav {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 28px;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}
.lp-nav-brand { display: flex; align-items: center; gap: 12px; }
.lp-logo { font-size: 18px; font-weight: 700; letter-spacing: -.02em; color: var(--ink); }
.lp-nav-tag {
  font-size: 10.5px;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 10px;
  border-radius: 999px;
}
.lp-nav-cta {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
  transition: color .12s ease;
}
.lp-nav-cta:hover { color: #2f5fde; }

.lp-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 30px;
  max-width: 920px;
  width: 100%;
  margin: 0 auto;
  padding: 28px 28px;
}

/* hero */
.lp-hero { text-align: center; }
.lp-eyebrow {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .05em;
  color: var(--ink-faint);
  text-transform: uppercase;
  margin-bottom: 16px;
}
.lp-title {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -.025em;
  color: var(--ink);
  max-width: 760px;
  margin: 0 auto;
}
.lp-lede {
  margin: 18px auto 0;
  max-width: 580px;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-soft);
}
.lp-hero-actions { margin-top: 26px; display: flex; justify-content: center; flex-wrap: wrap; gap: 12px; }
.lp-btn {
  font-size: 14px;
  padding: 11px 22px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}

/* how-it-works steps */
.lp-section { text-align: center; }
.lp-kicker {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}
.lp-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  max-width: 820px;
  margin: 0 auto;
}
.lp-step {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px 18px 20px;
  text-align: left;
}
.lp-step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
  font-size: 13px;
  margin-bottom: 12px;
}
.lp-step-title { font-size: 14.5px; font-weight: 700; color: var(--ink); margin-bottom: 6px; }
.lp-step-text { font-size: 13px; line-height: 1.55; color: var(--ink-soft); }

/* compact note line */
.lp-note {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--ink-faint);
}
.lp-note strong { color: var(--ink-soft); font-weight: 600; }

/* footer */
.lp-footer {
  flex-shrink: 0;
  text-align: center;
  padding: 14px 28px 18px;
  border-top: 1px solid var(--line);
}
.lp-footer-line { font-size: 11.5px; font-style: italic; color: var(--ink-faint); }

@media (max-width: 720px) {
  .lp-steps { grid-template-columns: 1fr; }
  .lp-main { gap: 24px; }
}

/* =============================================================
 * Back-to-portfolio button (fixed, both pages)
 * ============================================================= */
.back-portfolio {
  position: fixed;
  top: 14px;
  left: 16px;
  z-index: 60;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 14px 8px 11px;
  border-radius: 999px;
  font-family: var(--font);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: .005em;
  color: var(--accent);
  background: rgba(255, 255, 255, .82);
  border: 1px solid var(--line);
  backdrop-filter: blur(12px) saturate(140%);
  -webkit-backdrop-filter: blur(12px) saturate(140%);
  box-shadow: var(--shadow);
  text-decoration: none;
  transition: background .15s ease, border-color .15s ease, box-shadow .15s ease, color .15s ease;
}
.back-portfolio:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
  box-shadow: 0 6px 18px -8px rgba(58,109,240,.35);
}
.back-portfolio svg { transition: transform .22s cubic-bezier(.22,.61,.36,1); }
.back-portfolio:hover svg { transform: translateX(-2px); }

/* On the prototype workspace, the app header already sits at the top-left,
   so the button reflows into the header instead of overlapping the brand. */
.app-header .back-portfolio {
  position: static;
  box-shadow: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  background: var(--surface);
}

/* On the landing page the button lives inside the nav bar (left slot),
   so it flows in place rather than floating over the page. */
.lp-nav .back-portfolio {
  position: static;
  box-shadow: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  background: var(--surface-2);
}

/* Icon-only round "back to previous page" button (prototype header),
   visually distinct from the labelled "Back to portfolio" pill. */
.back-prev {
  width: 34px;
  height: 34px;
  padding: 0;
  gap: 0;
  border-radius: 50%;
  justify-content: center;
}

@media (prefers-reduced-motion: reduce) {
  .back-portfolio, .back-portfolio svg { transition: none; }
}