:root {
  --bg: #f7f5fc;
  --card: #ffffff;
  --text: #2d2640;
  --muted: #7a7291;
  --primary: #7c4dcc;
  --primary-dark: #5e35a8;
  --lavender: #ece6fa;
  --lilac: #c9b6f0;
  --ok: #2e9e6a;
  --bad: #d64c6b;
  --radius: 18px;
  --shadow: 0 8px 28px rgba(92, 60, 160, 0.10);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  margin: 0;
  font-family: "Segoe UI", "Inter", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}
[hidden] { display: none !important; }

a { color: var(--primary); text-decoration: none; }
h1, h2, h3 { line-height: 1.2; margin: 0 0 .5rem; }
h2 { font-size: 1.6rem; }

/* Шапка */
.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; justify-content: space-between; align-items: center;
  padding: .9rem 1.5rem;
  background: rgba(255, 255, 255, .85);
  backdrop-filter: blur(10px);
  box-shadow: 0 1px 0 rgba(124, 77, 204, .08);
}
.logo { font-weight: 800; font-size: 1.3rem; color: var(--text); }
.logo span { color: var(--primary); }
.nav a { margin-left: 1.2rem; color: var(--muted); font-weight: 500; }
.nav a:hover { color: var(--primary); }

main { max-width: 1100px; margin: 0 auto; padding: 0 1.25rem 3rem; }

/* Герой */
.hero { text-align: center; padding: 3.5rem 0 2rem; }
.eyebrow { color: var(--primary); text-transform: uppercase; letter-spacing: .12em; font-size: .8rem; font-weight: 700; }
.hero h1 { font-size: clamp(2rem, 5vw, 3.2rem); margin-bottom: 1rem; }
.lead { max-width: 640px; margin: 0 auto 1.8rem; color: var(--muted); font-size: 1.05rem; }
.hero-actions { display: flex; gap: .8rem; justify-content: center; flex-wrap: wrap; }
.counters { display: flex; gap: 1rem; justify-content: center; margin-top: 2rem; flex-wrap: wrap; }
.counter {
  background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow);
  padding: .9rem 1.8rem; min-width: 140px;
}
.counter strong { display: block; font-size: 1.9rem; color: var(--primary); }
.counter span { color: var(--muted); font-size: .9rem; }

/* Кнопки */
.btn {
  display: inline-block; border: 0; cursor: pointer; font: inherit; font-weight: 600;
  padding: .75rem 1.4rem; border-radius: 999px; transition: transform .15s, background .15s;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 6px 16px rgba(124, 77, 204, .3); }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost { background: var(--lavender); color: var(--primary-dark); }
.btn-ghost:hover { background: #e0d6f7; }
.btn-small { padding: .45rem 1rem; font-size: .9rem; }
.btn-small:disabled, .btn:disabled { opacity: .5; cursor: not-allowed; transform: none; }
.link { background: none; border: 0; padding: 0; color: var(--primary); cursor: pointer; font: inherit; text-decoration: underline; }

/* Панели */
.panel {
  background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 1.8rem; margin-top: 1.5rem;
}
.section-head { display: flex; justify-content: space-between; align-items: center; gap: 1rem; flex-wrap: wrap; margin-bottom: .6rem; }
.muted { color: var(--muted); }

/* Папки */
.folder-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 1rem; margin-top: 1rem; }
.folder-card {
  background: linear-gradient(135deg, #fff, var(--lavender));
  border: 1px solid #e6dcf7; border-radius: var(--radius);
  padding: 1.2rem; cursor: pointer; text-align: left; font: inherit; color: inherit;
  transition: transform .15s, box-shadow .15s;
}
.folder-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.folder-card h3 { font-size: 1.1rem; }
.folder-card p { margin: 0; color: var(--muted); font-size: .9rem; }
.folder-card .count { display: inline-block; margin-top: .6rem; color: var(--primary); font-weight: 700; font-size: .9rem; }
.folder-card .tag { font-size: .7rem; background: var(--lilac); color: #fff; padding: .1rem .5rem; border-radius: 999px; margin-left: .4rem; vertical-align: middle; }

/* Поиск */
.toolbar { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: .7rem; margin: 1rem 0 1.4rem; }
.input {
  width: 100%; padding: .75rem 1rem; border-radius: 12px; border: 1px solid #ddd5ee;
  background: #fdfcff; font: inherit; color: var(--text);
}
.input:focus { outline: 2px solid var(--lilac); border-color: var(--primary); }
textarea.input { resize: vertical; min-height: 70px; }

/* Карточки слов */
.word-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: 1.1rem; }
.word-card {
  background: #fff; border: 1px solid #efe9f9; border-radius: var(--radius);
  padding: 1.3rem; box-shadow: 0 2px 10px rgba(92, 60, 160, .06);
  display: flex; flex-direction: column; gap: .5rem;
}
.word-head { display: flex; justify-content: space-between; align-items: baseline; gap: .5rem; }
.word-title { font-size: 1.5rem; font-weight: 800; color: var(--text); margin: 0; }
.pron { color: var(--muted); font-size: .9rem; }
.badge { font-size: .75rem; background: var(--lavender); color: var(--primary-dark); padding: .2rem .6rem; border-radius: 999px; white-space: nowrap; }
.word-card .meaning { margin: 0; font-weight: 600; }
.example { background: #faf8ff; border-left: 3px solid var(--lilac); padding: .6rem .8rem; border-radius: 10px; margin: 0; }
.example em { display: block; color: var(--muted); font-style: normal; font-size: .92rem; margin-top: .2rem; }
.context { color: var(--muted); font-size: .92rem; margin: 0; }
.card-actions { margin-top: auto; display: flex; gap: .5rem; flex-wrap: wrap; padding-top: .4rem; }

/* Пустое состояние */
.empty { text-align: center; padding: 2rem 1rem; color: var(--muted); }

/* Тренировка */
.quiz { margin-top: 1rem; }
.question {
  background: linear-gradient(135deg, #fff, #f6f2fd); border-radius: var(--radius);
  padding: 1.4rem; border: 1px solid #efe9f9;
}
.question .sentence { font-size: 1.25rem; font-weight: 600; margin: 0 0 1rem; }
.question .sentence mark { background: var(--lilac); color: var(--text); border-radius: 6px; padding: 0 .25rem; }
.options { display: grid; gap: .6rem; }
.option {
  text-align: left; font: inherit; color: var(--text); background: #fff;
  border: 2px solid #e6dcf7; border-radius: 14px; padding: .8rem 1rem; cursor: pointer;
  transition: border-color .15s, background .15s;
}
.option:hover:not(:disabled) { border-color: var(--primary); }
.option:disabled { cursor: default; }
.option.correct { border-color: var(--ok); background: #e9f8f0; }
.option.wrong { border-color: var(--bad); background: #fdecf0; }
.feedback { margin-top: 1rem; padding: 1rem; border-radius: 14px; }
.feedback.ok { background: #e9f8f0; }
.feedback.bad { background: #fdecf0; }
.feedback p { margin: .3rem 0; }
.quiz-actions { margin-top: 1rem; display: flex; justify-content: flex-end; }

/* Исследование */
.research { background: linear-gradient(135deg, #fff, var(--lavender)); }

.footer { text-align: center; color: var(--muted); font-size: .85rem; padding: 2rem 1rem; }

/* Модальное окно */
.modal {
  position: fixed; inset: 0; background: rgba(45, 38, 64, .45);
  display: flex; align-items: center; justify-content: center; padding: 1rem; z-index: 50;
}
.modal-card {
  position: relative; background: #fff; border-radius: 22px; box-shadow: var(--shadow);
  width: 100%; max-width: 540px; max-height: 92vh; overflow-y: auto; padding: 1.8rem;
}
.modal-close {
  position: absolute; top: .6rem; right: .8rem; background: none; border: 0;
  font-size: 1.8rem; color: var(--muted); cursor: pointer; line-height: 1;
}
.form { display: grid; gap: .9rem; }
.form label { display: grid; gap: .3rem; font-weight: 600; font-size: .92rem; }
.form small { font-weight: 400; color: var(--muted); }
.form .error { color: var(--bad); font-size: .85rem; min-height: 1em; font-weight: 500; }
.form-actions { display: flex; justify-content: flex-end; gap: .6rem; margin-top: .4rem; }
.row-inline { display: flex; gap: .5rem; align-items: stretch; }
.row-inline .input { flex: 1; }

/* Уведомления */
.toast {
  position: fixed; left: 50%; bottom: 1.5rem; transform: translateX(-50%);
  background: var(--text); color: #fff; padding: .8rem 1.4rem; border-radius: 999px;
  box-shadow: var(--shadow); z-index: 60; font-weight: 500;
}

/* Нижнее меню (видно только на телефоне) */
.tabbar { display: none; }

/* Адаптация */
@media (max-width: 800px) {
  .toolbar { grid-template-columns: 1fr; }
  .nav { display: none; }
  .tabbar {
    display: flex; justify-content: space-around; align-items: center;
    position: fixed; left: 0; right: 0; bottom: 0; z-index: 20;
    background: #fff; box-shadow: 0 -4px 20px rgba(92, 60, 160, .08);
    padding: .5rem .6rem calc(.5rem + env(safe-area-inset-bottom));
  }
  .tabbar a { color: var(--muted); font-size: .72rem; font-weight: 600; }
  .tab-add {
    width: 52px; height: 52px; margin-top: -26px; border: 0; border-radius: 50%;
    background: var(--primary); color: #fff; font-size: 1.8rem; cursor: pointer;
    box-shadow: 0 6px 16px rgba(124, 77, 204, .4);
  }
  main { padding-bottom: 6rem; }
}
@media (max-width: 480px) {
  .topbar { padding: .8rem 1rem; }
  .panel { padding: 1.2rem; }
  .hero { padding-top: 2rem; }
  .word-grid { grid-template-columns: 1fr; }
}