/* ============================================================
   Polyglyph — styles
   ============================================================ */

:root {
  --bg:        #f6f7fb;
  --bg-soft:   #ffffff;
  --card:      #ffffff;
  --card-2:    #f1f3f9;
  --text:      #1a1c27;
  --text-soft: #5b6072;
  --text-dim:  #8a8fa3;
  --border:    #e6e8f0;
  --accent:    #6366f1;
  --accent-2:  #8b5cf6;
  --accent-3:  #ec4899;
  --ok:        #10b981;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --shadow: 0 1px 2px rgba(20, 22, 40, .04), 0 8px 24px rgba(20, 22, 40, .06);
  --shadow-lg: 0 12px 40px rgba(20, 22, 40, .12);
  --radius: 18px;
  --maxw: 1120px;
}

[data-theme="dark"] {
  --bg:        #0c0e16;
  --bg-soft:   #11131e;
  --card:      #161927;
  --card-2:    #1d2132;
  --text:      #eef0f8;
  --text-soft: #aab0c6;
  --text-dim:  #7a8099;
  --border:    #262b3d;
  --accent:    #818cf8;
  --accent-2:  #a78bfa;
  --accent-3:  #f472b6;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 10px 30px rgba(0,0,0,.35);
  --shadow-lg: 0 16px 50px rgba(0,0,0,.5);
}

* { box-sizing: border-box; }

/* Ensure the HTML hidden attribute always wins over display rules (e.g. .decode-from). */
[hidden] { display: none !important; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 80% -10%, color-mix(in srgb, var(--accent-2) 16%, transparent), transparent 60%),
    radial-gradient(1000px 500px at -10% 0%, color-mix(in srgb, var(--accent-3) 12%, transparent), transparent 55%),
    var(--bg);
  background-attachment: fixed;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: 20px; }

.skip-link {
  position: absolute; left: -999px; top: 0;
  background: var(--accent); color: #fff; padding: 10px 16px; border-radius: 8px; z-index: 100;
}
.skip-link:focus { left: 12px; top: 12px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 40;
  backdrop-filter: saturate(140%) blur(12px);
  background: color-mix(in srgb, var(--bg-soft) 75%, transparent);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); font-weight: 800; }
.brand-mark {
  font-size: 1.5rem; line-height: 1;
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  -webkit-background-clip: text; background-clip: text; color: transparent;
  animation: spin 14s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.brand-text { font-size: 1.15rem; letter-spacing: -.02em; }

.header-actions { display: flex; align-items: center; gap: 10px; }

.lang-select {
  appearance: none; -webkit-appearance: none;
  border: 1px solid var(--border); background: var(--card); color: var(--text);
  border-radius: 12px; padding: 9px 30px 9px 12px; font-family: var(--sans);
  font-size: .88rem; font-weight: 600; cursor: pointer; height: 40px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238a8fa3' stroke-width='3' stroke-linecap='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 10px center;
  transition: border-color .15s ease;
}
.lang-select:hover { border-color: var(--accent); }
.lang-select:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.theme-toggle {
  width: 40px; height: 40px; border-radius: 12px;
  border: 1px solid var(--border); background: var(--card);
  cursor: pointer; font-size: 1.1rem; display: grid; place-items: center;
  transition: transform .15s ease, background .2s ease;
}
.theme-toggle:hover { transform: translateY(-1px); background: var(--card-2); }
.theme-toggle:active { transform: translateY(0); }

/* ---------- Hero ---------- */
.hero { padding: clamp(36px, 7vw, 80px) 20px 24px; text-align: center; }
.hero h1 {
  font-size: clamp(2.1rem, 6vw, 4rem); line-height: 1.05; letter-spacing: -.03em;
  margin: 0 0 18px; font-weight: 800;
}
.grad {
  background: linear-gradient(110deg, var(--accent), var(--accent-2) 45%, var(--accent-3));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lede {
  max-width: 620px; margin: 0 auto 36px; color: var(--text-soft);
  font-size: clamp(1rem, 2.2vw, 1.15rem);
}

.input-card {
  max-width: 760px; margin: 0 auto; text-align: left;
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow-lg);
}
.mode-switch {
  display: inline-flex; gap: 4px; margin-bottom: 16px;
  background: var(--card-2); border: 1px solid var(--border);
  border-radius: 12px; padding: 4px;
}
.mode-btn {
  border: none; background: transparent; color: var(--text-soft);
  padding: 7px 18px; border-radius: 9px; font-weight: 600; font-size: .88rem;
  cursor: pointer; font-family: var(--sans); transition: all .15s ease;
}
.mode-btn.active { background: var(--card); color: var(--text); box-shadow: var(--shadow); }
[data-theme="dark"] .mode-btn.active {
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #fff;
}

.decode-from { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; flex-wrap: wrap; }
.decode-from label {
  font-size: .78rem; font-weight: 600; letter-spacing: .05em;
  text-transform: uppercase; color: var(--text-dim);
}

.input-label {
  display: block; font-size: .78rem; font-weight: 600; letter-spacing: .05em;
  text-transform: uppercase; color: var(--text-dim); margin-bottom: 8px;
}
#sourceText {
  width: 100%; resize: vertical; min-height: 56px;
  border: none; outline: none; background: transparent; color: var(--text);
  font-family: var(--sans); font-size: clamp(1.05rem, 3vw, 1.35rem); font-weight: 500;
  line-height: 1.4;
}
#sourceText::placeholder { color: var(--text-dim); }

.input-actions {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--border); flex-wrap: wrap;
}
.action-cluster { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.btn-soft {
  display: inline-flex; align-items: center; gap: 7px;
  border: 1px solid var(--border); background: var(--card-2); color: var(--text-soft);
  padding: 8px 13px; border-radius: 10px; font-size: .85rem; font-weight: 600;
  cursor: pointer; font-family: var(--sans); transition: all .15s ease;
}
.btn-soft:hover { color: var(--text); border-color: var(--accent); transform: translateY(-1px); }
.btn-soft svg { width: 15px; height: 15px; }
#shareBtn {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff; border-color: transparent;
}
#shareBtn:hover { color: #fff; filter: brightness(1.06); }

.chips { display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
  border: 1px solid var(--border); background: var(--card-2); color: var(--text-soft);
  padding: 6px 12px; border-radius: 999px; font-size: .82rem; font-weight: 500;
  cursor: pointer; transition: all .15s ease; font-family: var(--sans);
}
.chip:hover { color: var(--text); border-color: var(--accent); transform: translateY(-1px); }
.btn-ghost {
  border: none; background: transparent; color: var(--text-dim);
  cursor: pointer; font-size: .85rem; font-weight: 600; font-family: var(--sans);
  padding: 6px 10px; border-radius: 8px; transition: color .15s ease;
}
.btn-ghost:hover { color: var(--accent-3); }

/* ---------- Results grid ---------- */
.results { padding: 24px 20px 8px; }
.grid {
  display: grid; gap: 18px;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}

.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow);
  display: flex; flex-direction: column; gap: 14px;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
  position: relative; overflow: hidden;
}
.card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2), var(--accent-3));
  opacity: 0; transition: opacity .2s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); }
.card:hover::before { opacity: 1; }

.card-head { display: flex; align-items: center; gap: 12px; }
.card-icon {
  width: 42px; height: 42px; flex: none; border-radius: 12px; display: grid; place-items: center;
  font-size: 1.25rem;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 18%, transparent), color-mix(in srgb, var(--accent-3) 18%, transparent));
}
.card-titles { min-width: 0; }
.card-title { font-weight: 700; font-size: 1.02rem; letter-spacing: -.01em; }
.card-tag { font-size: .8rem; color: var(--text-dim); }

.output {
  font-family: var(--mono); font-size: .95rem; line-height: 1.6;
  background: var(--card-2); border: 1px solid var(--border); border-radius: 12px;
  padding: 14px; min-height: 58px; word-break: break-word; white-space: pre-wrap;
  color: var(--text); flex: 1; user-select: all;
}
.output.is-empty { color: var(--text-dim); font-style: italic; user-select: none; }
/* Conversion results are symbol streams — keep them LTR even when the UI is RTL. */
.output, .card-tag { direction: ltr; }
[dir="rtl"] .output, [dir="rtl"] .card-tag { text-align: right; }
.output.runic, .output.braille { font-size: 1.3rem; letter-spacing: .04em; }
.output.flip { font-size: 1.15rem; }

.card-actions { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.copy-btn {
  display: inline-flex; align-items: center; gap: 7px;
  border: 1px solid var(--border); background: var(--card-2); color: var(--text-soft);
  padding: 8px 14px; border-radius: 10px; font-size: .85rem; font-weight: 600;
  cursor: pointer; font-family: var(--sans); transition: all .15s ease;
}
.copy-btn:hover { color: var(--text); border-color: var(--accent); }
.copy-btn.copied { color: var(--ok); border-color: var(--ok); }
.copy-btn svg { width: 15px; height: 15px; }

.about-btn {
  border: none; background: transparent; color: var(--text-dim);
  font-size: .82rem; font-weight: 600; cursor: pointer; font-family: var(--sans);
  display: inline-flex; align-items: center; gap: 5px; padding: 6px;
}
.about-btn:hover { color: var(--accent); }
.about-btn .chev { transition: transform .2s ease; display: inline-block; }
.about-btn[aria-expanded="true"] .chev { transform: rotate(180deg); }

.about {
  display: grid; grid-template-rows: 0fr; transition: grid-template-rows .25s ease;
}
.about-inner { overflow: hidden; }
.about.open { grid-template-rows: 1fr; }
.about-inner > div { padding-top: 6px; }
.about h4 {
  margin: 10px 0 4px; font-size: .72rem; text-transform: uppercase; letter-spacing: .07em;
  color: var(--accent); font-weight: 700;
}
.about p { margin: 0; font-size: .88rem; color: var(--text-soft); line-height: 1.55; }

/* ---------- Decode result ---------- */
.decode-result { padding: 24px 20px 8px; }
.decode-card { max-width: 760px; margin: 0 auto; }
#decodeOut { min-height: 80px; font-size: 1.15rem; font-family: var(--sans); }
.lossy-note {
  font-size: .82rem; line-height: 1.5; color: var(--accent-3);
  background: color-mix(in srgb, var(--accent-3) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent-3) 30%, transparent);
  border-radius: 10px; padding: 9px 13px;
}

/* ---------- Long-form content + FAQ ---------- */
.content { max-width: 800px; margin-inline: auto; padding: 56px 20px 8px; }
.content-head { margin-bottom: 28px; }
.eyebrow {
  display: inline-block; font-size: .74rem; font-weight: 700; letter-spacing: .12em;
  text-transform: uppercase; color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  padding: 4px 12px; border-radius: 999px; margin-bottom: 14px;
}
.content-head h2 { font-size: clamp(1.5rem, 4vw, 2.1rem); letter-spacing: -.02em; margin: 0 0 12px; }
.content-intro { color: var(--text-soft); font-size: 1.02rem; margin: 0; max-width: 64ch; }

.explained-item { padding: 24px 0; border-bottom: 1px solid var(--border); }
.explained-item:last-child { border-bottom: none; }
.explained-item h3 {
  display: flex; align-items: center; gap: 11px;
  font-size: 1.18rem; letter-spacing: -.01em; margin: 0 0 10px;
}
.explained-item h3 .ico {
  width: 36px; height: 36px; flex: none; border-radius: 10px; display: grid; place-items: center;
  font-size: 1.1rem;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 18%, transparent), color-mix(in srgb, var(--accent-3) 18%, transparent));
}
.explained-item p { color: var(--text-soft); line-height: 1.7; margin: 0 0 12px; }
.explained-item p:last-child { margin-bottom: 0; }
.content code {
  font-family: var(--mono); font-size: .88em;
  background: var(--card-2); border: 1px solid var(--border);
  border-radius: 6px; padding: 1px 6px; color: var(--text);
}
.content em { color: var(--text); font-style: normal; font-weight: 600; }

.faq { padding-top: 40px; }
.faq-item {
  border: 1px solid var(--border); border-radius: 14px; background: var(--card);
  margin-bottom: 10px; overflow: hidden; transition: border-color .15s ease;
}
.faq-item[open] { border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); }
.faq-item summary {
  cursor: pointer; list-style: none; padding: 16px 18px;
  font-weight: 600; font-size: 1rem; line-height: 1.45;
  display: flex; justify-content: space-between; align-items: center; gap: 14px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+"; flex: none; font-size: 1.4rem; font-weight: 400; color: var(--accent);
  line-height: 1; transition: transform .2s ease;
}
.faq-item[open] summary::after { content: "−"; }
.faq-item summary:hover { color: var(--accent); }
.faq-a { padding: 0 18px 18px; }
.faq-a p { margin: 0; color: var(--text-soft); line-height: 1.7; }

/* Document pages (privacy / about / contact) */
.doc h3 { font-size: 1.12rem; letter-spacing: -.01em; margin: 26px 0 8px; }
.doc p { color: var(--text-soft); line-height: 1.7; margin: 0 0 12px; }
.doc-meta { font-size: .88rem; color: var(--text-dim); margin: 0 0 14px; }
.content a { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }
.content a:hover { color: var(--accent-3); }
.content ul { color: var(--text-soft); line-height: 1.7; padding-left: 1.25em; margin: 0 0 14px; }
.content li { margin-bottom: 8px; }
.contact-email { font-size: 1.15rem; font-weight: 600; }
.contact-email a { font-family: var(--mono); }

/* Footer navigation */
.footer-nav { display: flex; gap: 8px 22px; justify-content: center; flex-wrap: wrap; margin-bottom: 12px; }
.footer-nav a { color: var(--text-soft); text-decoration: none; font-size: .88rem; font-weight: 600; }
.footer-nav a:hover { color: var(--accent); }

/* ---------- About site / footer ---------- */
.about-site { padding: 56px 20px 20px; max-width: 720px; text-align: center; }
.about-site h2 { font-size: clamp(1.4rem, 4vw, 2rem); letter-spacing: -.02em; margin: 0 0 14px; }
.about-site p { color: var(--text-soft); margin: 0; }

.site-footer { margin-top: 40px; border-top: 1px solid var(--border); padding: 24px 0; }
.site-footer p { text-align: center; color: var(--text-dim); font-size: .85rem; margin: 0; }

/* ---------- Toast ---------- */
.toast {
  position: fixed; left: 50%; bottom: 28px; transform: translate(-50%, 20px);
  background: var(--text); color: var(--bg); padding: 11px 20px; border-radius: 12px;
  font-size: .88rem; font-weight: 600; box-shadow: var(--shadow-lg);
  opacity: 0; pointer-events: none; transition: opacity .25s ease, transform .25s ease; z-index: 80;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto; }
}

/* ---------- Small screens ---------- */
@media (max-width: 480px) {
  .grid { grid-template-columns: 1fr; }
  .input-card { padding: 14px; }
  .card { padding: 16px; }
}