:root {
  --bg: #f4f6f8;
  --card: #ffffff;
  --ink: #1c2430;
  --muted: #67727e;
  --accent: #2f6f4f;
  --accent-dark: #245a40;
  --ok: #2e9e5b;
  --ok-bg: #e6f6ec;
  --err: #d23b3b;
  --err-bg: #fbe9e9;
  --border: #d6dde3;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 4px 12px rgba(0, 0, 0, 0.05);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
}

.app-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  background: var(--accent);
  color: #fff;
}

.title-block h1 { margin: 0; font-size: 1.6rem; letter-spacing: 0.5px; }
.subtitle { margin: 0.15rem 0 0; font-size: 0.85rem; opacity: 0.9; }

.header-actions { flex: none; display: flex; gap: 0.5rem; }

.help-btn {
  flex: none;
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.8);
  background: transparent;
  color: #fff;
  font-size: 1.2rem;
  font-weight: 700;
  cursor: pointer;
  line-height: 1;
}
.help-btn:hover { background: rgba(255, 255, 255, 0.18); }

/* Tabs */
.tabs {
  display: flex;
  gap: 0.25rem;
  max-width: 760px;
  margin: 0 auto;
  padding: 0.6rem 1.25rem 0;
}
.tab {
  border: none;
  border-radius: var(--radius) var(--radius) 0 0;
  padding: 0.55rem 1.1rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--muted);
  background: #e4e9ee;
  cursor: pointer;
}
.tab:hover { background: #d6dee5; }
.tab.active { background: var(--card); color: var(--accent-dark); box-shadow: var(--shadow); }

main { max-width: 760px; margin: 0 auto; padding: 1.25rem; }

.case-toggle {
  font-size: 0.85rem;
  color: var(--muted);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-left: auto;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
  margin-bottom: 1.25rem;
}

button { font-family: inherit; }

.primary-btn, .secondary-btn {
  border: none;
  border-radius: var(--radius);
  padding: 0.6rem 1.1rem;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
}
.primary-btn { background: var(--accent); color: #fff; }
.primary-btn:hover { background: var(--accent-dark); }
.secondary-btn { background: #e4e9ee; color: var(--ink); }
.secondary-btn:hover { background: #d6dee5; }

/* Special-character copy bar */
.char-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  max-width: 760px;
  margin: 0 auto;
  padding: 0.6rem 1.25rem;
}
.char-bar-label { font-size: 0.8rem; color: var(--muted); }
.char-chips { display: flex; flex-wrap: wrap; gap: 0.3rem; }
.char-chip {
  min-width: 2rem;
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card);
  color: var(--ink);
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s;
}
.char-chip:hover { background: #eef2f5; border-color: var(--accent); }
.char-chip:active { background: var(--ok-bg); }
.char-copied { font-size: 0.8rem; color: var(--ok); min-height: 1rem; }

/* Tense toggles */
.tense-toggles {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}
.toggles-label { font-size: 0.85rem; color: var(--muted); font-weight: 600; }
.toggles { display: flex; flex-wrap: wrap; gap: 0.5rem 1rem; }
.tense-toggle {
  font-size: 0.85rem;
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  cursor: pointer;
}

.verb-prompt {
  background: var(--card);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  box-shadow: var(--shadow);
  margin-bottom: 1.25rem;
}
.verb-prompt h2 { margin: 0; font-size: 1.8rem; color: var(--accent-dark); }
.principal-parts-label { margin: 0.1rem 0 0; font-size: 0.72rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }
.translation { margin: 0.35rem 0 0; color: var(--muted); font-style: italic; }
.verb-governs { margin: 0.5rem 0 0; font-size: 0.9rem; color: var(--ink); }
.verb-governs strong { color: var(--accent-dark); }
.verb-governs .case-name { color: var(--muted); font-size: 0.85rem; }
.verb-example {
  margin: 0.5rem 0 0;
  padding: 0.5rem 0.7rem;
  background: #eef2f5;
  border-left: 3px solid var(--accent);
  border-radius: 0 6px 6px 0;
  font-size: 0.9rem;
}
.verb-example .example-lt { font-weight: 600; }
.verb-example .example-en { color: var(--muted); font-style: italic; }
.verb-class { margin: 0.5rem 0 0; font-size: 0.8rem; color: var(--muted); }
.score { margin: 0.5rem 0 0; font-size: 0.9rem; font-weight: 600; }

.placeholder { color: var(--muted); text-align: center; padding: 2rem 0; }

.tense-block {
  background: var(--card);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  box-shadow: var(--shadow);
  margin-bottom: 1rem;
}
.tense-block h3 {
  margin: 0 0 0.15rem;
  font-size: 1.05rem;
  color: var(--accent-dark);
}
.tense-block .lt-name { font-weight: 400; color: var(--muted); font-size: 0.85rem; }

.rows { display: grid; gap: 0.55rem; margin-top: 0.75rem; }

.conj-row {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  align-items: center;
  gap: 0.6rem;
}
.pronoun { color: var(--muted); font-size: 0.95rem; }

.conj-row input {
  width: 100%;
  padding: 0.55rem 0.7rem;
  font-size: 1rem;
  border: 2px solid var(--border);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  transition: border-color 0.15s, background 0.15s;
}
.conj-row input:focus { outline: none; border-color: var(--accent); }

.conj-row input.correct {
  border-color: var(--ok);
  background: var(--ok-bg);
}
.conj-row input.incorrect {
  border-color: var(--err);
  background: var(--err-bg);
}
.conj-row .answer {
  grid-column: 2;
  font-size: 0.85rem;
  color: var(--err);
  margin-top: -0.2rem;
}

.app-footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.8rem;
  padding: 1.5rem 1rem 2.5rem;
}
.app-footer p { margin: 0.25rem 0; }
.app-footer .contact { font-size: 0.75rem; }
.app-footer .contact a { color: var(--muted); }
.app-footer .contact a:hover { color: var(--accent-dark); }

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(20, 28, 36, 0.55);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 1.5rem;
  overflow-y: auto;
  z-index: 50;
}
.modal-content {
  background: var(--card);
  border-radius: var(--radius);
  max-width: 720px;
  width: 100%;
  padding: 1.75rem 1.75rem 2rem;
  box-shadow: var(--shadow);
  position: relative;
}
.modal-close {
  position: absolute;
  top: 0.6rem;
  right: 0.8rem;
  border: none;
  background: transparent;
  font-size: 1.8rem;
  line-height: 1;
  color: var(--muted);
  cursor: pointer;
}
.modal-close:hover { color: var(--ink); }

#help-body h2 { margin-top: 0; color: var(--accent-dark); }
#help-body h3 { color: var(--accent-dark); margin-top: 1.5rem; }
#help-body table { border-collapse: collapse; width: 100%; margin: 0.5rem 0 1rem; font-size: 0.9rem; }
#help-body th, #help-body td { border: 1px solid var(--border); padding: 0.4rem 0.55rem; text-align: left; }
#help-body th { background: #eef2f5; }
#help-body code { background: #eef2f5; padding: 0.1rem 0.35rem; border-radius: 4px; font-size: 0.9em; }
#help-body .note { background: var(--ok-bg); border-left: 3px solid var(--ok); padding: 0.6rem 0.8rem; border-radius: 0 6px 6px 0; margin: 0.75rem 0; }
#help-body .tscroll { overflow-x: auto; margin: 0.5rem 0 1rem; }
#help-body .tscroll table { margin: 0; white-space: nowrap; }
#help-body a { color: var(--accent-dark); }
#help-body .suffix-table { font-size: 0.82rem; }
#help-body .suffix-table th, #help-body .suffix-table td { text-align: center; padding: 0.3rem 0.45rem; }
#help-body .suffix-table td:first-child, #help-body .suffix-table th:first-child { text-align: left; }
#help-body .suffix-table .section th { background: #e4e9ee; }
#help-body .suffix-table .rare { color: var(--muted); }

/* Verb list modal */
#list-modal h2 { margin-top: 0; color: var(--accent-dark); }
.list-hint { margin: 0 0 0.75rem; color: var(--muted); font-size: 0.85rem; }
.list-filter {
  width: 100%;
  padding: 0.55rem 0.7rem;
  font-size: 1rem;
  border: 2px solid var(--border);
  border-radius: 8px;
  margin-bottom: 1rem;
}
.list-filter:focus { outline: none; border-color: var(--accent); }
.verb-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.4rem;
}
.verb-list-item {
  width: 100%;
  text-align: left;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card);
  padding: 0.5rem 0.7rem;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  transition: background 0.12s, border-color 0.12s;
}
.verb-list-item:hover { background: #eef2f5; border-color: var(--accent); }
.vli-inf { font-weight: 600; color: var(--accent-dark); }
.vli-tr { font-size: 0.8rem; color: var(--muted); }
.verb-list-empty { color: var(--muted); font-size: 0.9rem; padding: 0.5rem 0; }

.hidden { display: none !important; }

@media (max-width: 520px) {
  .conj-row { grid-template-columns: 4.5rem 1fr; }
  .title-block h1 { font-size: 1.35rem; }
}