:root {
  --bg: #f7f7f5;
  --panel: #ffffff;
  --ink: #1f2328;
  --muted: #6b7280;
  --line: #e3e3df;
  --accent: #3b5bdb;
  --green: #2f9e44;
  --green-bg: #ebfbee;
  --amber: #f08c00;
  --amber-bg: #fff9db;
  --red: #e03131;
  --red-bg: #fff5f5;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: var(--bg);
}

.hidden { display: none !important; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.25rem;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
}
.topbar h1 { font-size: 1.15rem; margin: 0; }
.user-area { font-size: 0.9rem; color: var(--muted); display: flex; gap: 0.75rem; align-items: center; }

.signed-out { max-width: 30rem; margin: 4rem auto; text-align: center; }

.app { max-width: 46rem; margin: 1.5rem auto; padding: 0 1rem 4rem; }

.controls {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}
.controls label { font-weight: 600; }
select {
  padding: 0.4rem 0.5rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 1rem;
  background: var(--panel);
}

.btn {
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  cursor: pointer;
  font-size: 0.9rem;
}
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); color: #fff; border-color: var(--accent); text-decoration: none; display: inline-block; }
.btn.ghost { color: var(--muted); }

/* Verb banner + accent bar ride together as one pinned header while scrolling. */
.sticky-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--bg);
  padding-bottom: 0.75rem;
}

.accent-bar { display: flex; flex-wrap: wrap; gap: 0.25rem; }
.accent-bar button {
  min-width: 2rem;
  padding: 0.3rem;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--panel);
  cursor: pointer;
  font-size: 1rem;
}
.accent-bar button:hover { border-color: var(--accent); }

/* Banner naming the current verb; pinned via its .sticky-header parent. */
.verb-indicator {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  background: var(--accent);
  color: #fff;
  padding: 0.5rem 0.9rem;
  border-radius: 8px;
  margin-bottom: 0.5rem;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.12);
}
.verb-indicator .vi-label { font-size: 0.8rem; opacity: 0.85; text-transform: uppercase; letter-spacing: 0.03em; }
.verb-indicator .vi-verb { font-size: 1.1rem; font-weight: 700; }
.verb-indicator .vi-progress {
  margin-left: auto;
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
  opacity: 0.95;
}
.verb-indicator .vi-progress.perfect {
  font-weight: 700;
  opacity: 1;
}
.verb-indicator .vi-progress:empty { display: none; }

.tense-block {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.75rem 1rem;
  margin-bottom: 1rem;
  /* Clear the sticky header when scrolled into view (height set in JS). */
  scroll-margin-top: var(--sticky-h, 3.5rem);
}
.tense-block h3 {
  margin: 0 0 0.5rem;
  font-size: 0.95rem;
}
.tense-block .mood { color: var(--muted); font-weight: 400; font-size: 0.8rem; }

.row { padding: 0.2rem 0; }
.row-line {
  display: grid;
  grid-template-columns: 6.5rem 1fr 1.6rem;
  gap: 0.5rem;
  align-items: center;
}
.row .person { color: var(--muted); font-size: 0.9rem; text-align: right; }
.row input {
  padding: 0.4rem 0.5rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 1rem;
  width: 100%;
}
.row input:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
.row .mark { text-align: center; font-weight: 700; }

/* Example sentence: faint until this field is focused, then dark + bold. */
.row-example {
  padding-left: 7rem; /* align under the input */
  margin-top: 0.15rem;
  font-size: 0.82rem;
  color: var(--muted);
  opacity: 0.65;
}
.row-example:empty { display: none; }
.row.focused .row-example { color: var(--ink); opacity: 1; font-weight: 600; }

/* pt-PT translation, revealed under the English once the form is answered. */
.row-example-pt {
  padding-left: 7rem;
  margin-top: 0.05rem;
  font-size: 0.82rem;
  font-style: italic;
  color: var(--muted);
}
.row-example-pt:empty { display: none; }

/* The field reflects the current value: green when right, red when wrong. */
.row.correct input { background: var(--green-bg); border-color: var(--green); }
.row.correct .mark { color: var(--green); }
.row.wrong input { background: var(--red-bg); border-color: var(--red); }
.row.wrong .mark { color: var(--red); }

/* Sticky "missed it first try" note; persists even once the field goes green. */
.answer {
  padding-left: 7rem; /* align under the input: person col (6.5rem) + gap (0.5rem) */
  margin: -0.1rem 0 0.2rem;
  font-size: 0.85rem;
  color: var(--red);
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}
/* Once the field is green, soften the record from alarming red to muted. */
.answer.resolved { color: var(--muted); }
.answer b { color: var(--ink); }

.typo-btn {
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--muted);
  border-radius: 5px;
  padding: 0.05rem 0.5rem;
  font-size: 0.78rem;
  cursor: pointer;
}
.typo-btn:hover { border-color: var(--accent); color: var(--ink); }

/* Bottom-of-drill controls: restart this verb, or move on to another. */
.footer-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  /* Leave breathing room below when scrolled into view (block: "end"). */
  scroll-margin-bottom: 2rem;
}
.footer-controls .next-verb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
}
.footer-controls .next-verb label { color: var(--muted); font-weight: 600; }
.footer-summary {
  flex-basis: 100%; /* sits on its own line above the buttons */
  font-size: 1.15rem;
  font-weight: 700;
}
.footer-summary.perfect { color: var(--green); }
.footer-summary:empty { display: none; }

/* Fixed, non-interactive "Correct!" toast. Same spot regardless of scroll. */
.toast {
  position: fixed;
  top: 1rem;
  left: 50%;
  transform: translate(-50%, -0.5rem);
  z-index: 100;
  padding: 0.45rem 1rem;
  border-radius: 999px;
  background: var(--green);
  color: #fff;
  font-weight: 700;
  font-size: 0.95rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.18);
  pointer-events: none; /* never steals clicks or focus */
  opacity: 0;
  transition: opacity 0.12s ease, transform 0.12s ease;
}
.toast.show {
  opacity: 1;
  transform: translate(-50%, 0);
}