/* ============================================================
   VYRON — ui.css · controls, progress, language, help overlay
   ============================================================ */

/* ---- Progress bar (top) ----------------------------------- */
#progress {
  position: fixed; top: 0; left: 0; height: 3px; width: 0%;
  background: linear-gradient(90deg, var(--accent-deep), var(--accent), var(--accent-soft));
  z-index: 50; transition: width .6s var(--ease);
  box-shadow: 0 0 18px rgba(201,162,75,.5);
}

/* ---- Control bar (bottom) --------------------------------- */
#controls {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: clamp(.8rem, 2vw, 1.4rem) clamp(1rem, 3vw, 2.2rem);
  background: linear-gradient(0deg, rgba(0,0,0,.55), transparent);
  opacity: 0; transform: translateY(8px);
  transition: opacity .4s var(--ease), transform .4s var(--ease);
  pointer-events: none;
}
#controls.show, #stage:hover #controls { opacity: 1; transform: none; }
#controls > * { pointer-events: auto; }

.ctrl-group { display: flex; align-items: center; gap: .4rem; }

.btn {
  display: inline-grid; place-items: center;
  width: 40px; height: 40px; border-radius: 10px;
  color: var(--fg-dim); border: 1px solid transparent;
  transition: all .25s var(--ease);
}
.btn:hover { color: var(--fg); background: rgba(255,255,255,.06); border-color: var(--line); }
.btn svg { width: 20px; height: 20px; stroke: currentColor; fill: none; stroke-width: 1.7; }
.btn.is-on { color: var(--accent); }

/* Autoplay button: filled play / pause icons that swap on state */
#btn-autoplay svg { fill: currentColor; stroke: none; }
#btn-autoplay .ic-pause { display: none; }
#btn-autoplay.is-on .ic-play { display: none; }
#btn-autoplay.is-on .ic-pause { display: block; }

/* Speed button: shows the current autoplay multiplier (e.g. 1.5×) */
.btn--speed { width: auto; min-width: 44px; padding: 0 .6rem; }
.speed-val {
  font-family: var(--font-display); font-weight: 700;
  font-size: .8rem; letter-spacing: .02em; color: currentColor;
}

/* ---- Counter ---------------------------------------------- */
#counter {
  font-family: var(--font-display); font-weight: 600;
  font-size: .85rem; letter-spacing: .18em; color: var(--fg-dim);
  min-width: 78px; text-align: center;
}
#counter .cur { color: var(--fg); }
#counter .sep { color: var(--fg-faint); margin: 0 .35em; }

/* ---- Language switcher ------------------------------------ */
#lang {
  display: flex; align-items: center; gap: .15rem;
  border: 1px solid var(--line); border-radius: 999px; padding: .2rem;
  background: rgba(0,0,0,.3); backdrop-filter: blur(8px);
}
.lang-btn {
  font-family: var(--font-display); font-weight: 600;
  font-size: .76rem; letter-spacing: .12em;
  padding: .42em .9em; border-radius: 999px; color: var(--fg-faint);
  transition: all .25s var(--ease);
}
.lang-btn:hover { color: var(--fg); }
.lang-btn.is-active { color: var(--bg); background: var(--accent); }

/* ---- Slide title chip (section label, top-left) ----------- */
#section-tag {
  position: fixed; top: clamp(1rem,3vh,2rem); left: clamp(1rem,3vw,2.4rem);
  z-index: 40; font-family: var(--font-display); font-weight: 600;
  font-size: .72rem; letter-spacing: .26em; text-transform: uppercase;
  color: var(--fg-faint); opacity: 0; transition: opacity .5s var(--ease);
}
#section-tag.show { opacity: 1; }
#section-tag .num { color: var(--accent); }

/* ---- Help / notes overlay --------------------------------- */
#help {
  position: fixed; inset: 0; z-index: 100;
  display: grid; place-items: center; padding: 2rem;
  background: rgba(4,4,6,.8); backdrop-filter: blur(14px);
  opacity: 0; visibility: hidden; transition: opacity .35s var(--ease);
}
#help.show { opacity: 1; visibility: visible; }
.help-card {
  max-width: 760px; width: 100%; max-height: 86vh; overflow: auto;
  background: linear-gradient(160deg, var(--bg-3), var(--bg-2));
  border: 1px solid var(--line); border-radius: 18px;
  padding: clamp(1.6rem, 4vw, 3rem);
  transform: translateY(16px) scale(.98); transition: transform .35s var(--ease);
}
#help.show .help-card { transform: none; }
.help-card h2 { font-size: clamp(1.4rem,3vw,2rem); margin-bottom: .3rem; }
.help-card h3 { font-size: 1rem; letter-spacing: .04em; color: var(--accent-soft); margin: 1.4rem 0 .5rem; }
.help-card p, .help-card li { color: var(--fg-dim); font-size: .95rem; line-height: 1.65; }
.help-card ul { display: grid; gap: .4rem; padding-left: 1.1rem; list-style: disc; }
.help-card code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .85em;
  background: rgba(255,255,255,.07); padding: .15em .45em; border-radius: 5px; color: var(--accent-soft);
}
.kbd {
  display: inline-grid; place-items: center; min-width: 26px; height: 26px; padding: 0 .5em;
  border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 6px;
  font-family: var(--font-display); font-size: .8rem; color: var(--fg);
  background: rgba(255,255,255,.05);
}
.help-close { position: absolute; top: 1rem; right: 1rem; }

/* ---- Edge nav hint arrows (subtle) ------------------------ */
.nav-edge {
  position: fixed; top: 0; bottom: 0; width: 12%; z-index: 30;
  display: grid; place-items: center; opacity: 0; transition: opacity .3s var(--ease);
}
.nav-edge svg { width: 30px; height: 30px; stroke: var(--fg); fill: none; stroke-width: 1.5; opacity: .6; }
.nav-edge:hover { opacity: 1; }
.nav-edge--prev { left: 0; cursor: w-resize; }
.nav-edge--next { right: 0; cursor: e-resize; }

/* ---- First-run hint --------------------------------------- */
#hint {
  position: fixed; left: 50%; bottom: clamp(4.5rem, 9vh, 6rem); transform: translateX(-50%);
  z-index: 45; font-size: .8rem; letter-spacing: .1em; color: var(--fg-faint);
  display: flex; align-items: center; gap: .6rem;
  transition: opacity .6s var(--ease);
}
#hint.hide { opacity: 0; pointer-events: none; }

/* ---- Overview / index panel ------------------------------- */
#index-panel {
  position: fixed; inset: 0; z-index: 95;
  display: grid; place-items: center; padding: 2rem;
  background: rgba(4,4,6,.82); backdrop-filter: blur(14px);
  opacity: 0; visibility: hidden; transition: opacity .35s var(--ease);
}
#index-panel.show { opacity: 1; visibility: visible; }
.index-card {
  max-width: 720px; width: 100%; max-height: 84vh; overflow: auto;
  background: linear-gradient(160deg, var(--bg-3), var(--bg-2));
  border: 1px solid var(--line); border-radius: 18px;
  padding: clamp(1.4rem, 4vw, 2.6rem);
  transform: translateY(16px); transition: transform .35s var(--ease);
}
#index-panel.show .index-card { transform: none; }
.index-card h2 { font-size: 1.4rem; margin-bottom: 1.2rem; }
.index-list { display: grid; gap: .25rem; }
.index-item {
  display: grid; grid-template-columns: auto 1fr auto; gap: 1rem; align-items: center;
  text-align: left; padding: .7rem .9rem; border-radius: 10px;
  border: 1px solid transparent; transition: all .2s var(--ease); width: 100%;
}
.index-item:hover { background: rgba(255,255,255,.05); border-color: var(--line); }
.index-item.is-current { border-color: rgba(201,162,75,.5); background: rgba(201,162,75,.08); }
.ix-num { font-family: var(--font-display); font-weight: 700; color: var(--accent); font-size: .9rem; letter-spacing: .1em; }
.ix-label { font-family: var(--font-display); font-weight: 600; color: var(--fg); }
.ix-odak { font-size: .7rem; letter-spacing: .2em; color: var(--fg-faint); text-transform: uppercase; }