/* SQL-тренажёр — стилистика Duolingo (Refero style 7088d695).
   Токены: Eager Green #58cc02, Storybook #d7ffb8, Spark Blue #1cb0f6,
   Charcoal #4b4b4b, Pencil Gray #777, Faded Gray #afafaf, Paper #fff.
   Плоские «стикерные» поверхности, радиус 12px, бордеры 2px, без градиентов. */

:root {
  --color-eager-green: #58cc02;
  --color-green-dark: #58a700;      /* нижняя грань 3D-кнопки */
  --color-storybook-green: #d7ffb8;
  --color-spark-blue: #1cb0f6;
  --color-blue-dark: #1899d6;
  --color-charcoal: #4b4b4b;
  --color-pencil-gray: #777777;
  --color-faded-gray: #afafaf;
  --color-paper-white: #ffffff;
  --color-night-ink: #131f38;       /* тёмная поверхность редактора кода */
  --radius: 12px;
  --font-main: 'Nunito', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font-main);
  font-weight: 500;
  background: var(--color-paper-white);
  color: var(--color-pencil-gray);
  font-size: 17px;
  line-height: 1.4;
}

h1, h2, h3, h4 { color: var(--color-charcoal); font-weight: 800; }
.green { color: var(--color-eager-green); }

/* ---------- Кастомные SVG-иконки ---------- */
.ic {
  width: 1.15em;
  height: 1.15em;
  vertical-align: -0.22em;
  flex-shrink: 0;
}
.logo-ic { width: 26px; height: 26px; vertical-align: -5px; }
.card h3, .step-card h3, .schema-card-head h3 { display: flex; align-items: center; gap: 10px; }
.card h3 .ic, .step-card h3 .ic { color: var(--color-eager-green); }
.step-card h3 { justify-content: center; }
.schema-card-head h3 .ic { color: var(--color-spark-blue); }
.task-btn .ic { margin-right: 10px; }
.task-btn .ic-done { color: var(--color-eager-green); }
.task-btn .ic-todo { color: var(--color-faded-gray); }

/* ---------- Верхняя навигация ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--color-paper-white);
  border-bottom: 2px solid #e5e5e5;
}
.topbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.logo {
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-main);
  font-weight: 900;
  font-size: 22px;
  color: var(--color-eager-green);
  letter-spacing: -0.02em;
  padding: 0;
}
.topnav { display: flex; align-items: center; gap: 12px; }
.nav-link {
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-main);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.053em;
  text-transform: uppercase;
  color: var(--color-faded-gray);
  padding: 10px 12px;
  border-radius: var(--radius);
}
.nav-link.active, .nav-link:hover { color: var(--color-spark-blue); }
.progress-pill {
  font-weight: 800;
  font-size: 15px;
  color: var(--color-pencil-gray);
  border: 2px solid var(--color-faded-gray);
  border-radius: var(--radius);
  padding: 8px 14px;
  white-space: nowrap;
}

/* ---------- Кнопки-стикеры ---------- */
.btn {
  font-family: var(--font-main);
  font-weight: 800;
  font-size: 15px;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  border-radius: var(--radius);
  padding: 12px 20px;
  cursor: pointer;
  border: 2px solid transparent;
  text-decoration: none;
  display: inline-block;
  transition: transform 0.05s ease, box-shadow 0.05s ease, filter 0.1s ease;
}
.btn:active { transform: translateY(4px); box-shadow: 0 0 0 transparent !important; }
.btn:disabled { opacity: 0.45; cursor: default; transform: none; box-shadow: none; }
.btn-green { background: var(--color-eager-green); color: #fff; box-shadow: 0 4px 0 var(--color-green-dark); }
.btn-green:hover { filter: brightness(1.05); }
.btn-outline {
  background: #fff;
  color: var(--color-spark-blue);
  border-color: var(--color-faded-gray);
  box-shadow: 0 4px 0 var(--color-faded-gray);
}
.btn-outline:hover { background: #f7f7f7; }
.btn-white {
  background: #fff;
  color: var(--color-eager-green);
  box-shadow: 0 4px 0 rgba(0, 0, 0, 0.2);
}
.btn-white-outline {
  background: transparent;
  color: #fff;
  border-color: #fff;
  box-shadow: 0 4px 0 rgba(0, 0, 0, 0.2);
}
.btn-sm { padding: 8px 14px; font-size: 13px; }

/* ---------- Каркас ---------- */
.page { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.screen { padding-bottom: 40px; }
.screen-title { font-size: 32px; margin: 32px 0 8px; }
.section { margin: 96px 0; }
.section h2 { font-size: 32px; margin: 0 0 8px; text-align: center; }
.section-sub { text-align: center; margin: 0 0 32px; font-size: 19px; }

.error-banner {
  background: #fff;
  color: #d33131;
  border: 2px solid #d33131;
  border-radius: var(--radius);
  padding: 12px 16px;
  margin: 16px 0;
  font-weight: 700;
}

/* ---------- Hero ---------- */
.hero {
  display: flex;
  align-items: center;
  gap: 48px;
  padding: 64px 0 32px;
}
.hero-text { flex: 1; min-width: 0; }
.hero-text h1 {
  font-size: 48px;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 16px 0;
}
.sticker {
  display: inline-block;
  font-weight: 800;
  font-size: 13px;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--color-spark-blue);
  border: 2px solid var(--color-faded-gray);
  border-radius: var(--radius);
  padding: 8px 14px;
}
.lead { font-size: 19px; max-width: 480px; color: var(--color-pencil-gray); }
.lead b { color: var(--color-charcoal); }
.hero-cta { display: flex; gap: 12px; margin: 24px 0; flex-wrap: wrap; }
.hero-progress { display: flex; align-items: center; gap: 12px; font-weight: 700; color: var(--color-charcoal); }
.progress-bar {
  width: 220px;
  height: 16px;
  background: #e5e5e5;
  border-radius: 8px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  width: 0;
  background: var(--color-eager-green);
  border-radius: 8px;
  transition: width 0.3s ease;
}

.hero-art {
  flex: 0 0 320px;
  height: 320px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}
.mascot {
  width: 260px;
  max-width: 100%;
  height: auto;
}
.float-chip {
  position: absolute;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 800;
  font-size: 14px;
  background: #fff;
  border: 2px solid var(--color-charcoal);
  border-radius: var(--radius);
  padding: 8px 12px;
  box-shadow: 0 4px 0 var(--color-charcoal);
  white-space: nowrap;
}
.chip-1 { top: 24px; left: 0; color: var(--color-spark-blue); font-family: var(--font-mono); }
.chip-2 { top: 120px; right: 0; color: var(--color-eager-green); }
.chip-3 { bottom: 24px; left: 24px; color: var(--color-charcoal); font-family: var(--font-mono); }

/* ---------- Шаги ---------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.step-card {
  border: 2px solid var(--color-faded-gray);
  border-radius: var(--radius);
  padding: 24px 20px;
  text-align: center;
}
.step-card h3 { margin: 12px 0 8px; font-size: 19px; }
.step-card p { margin: 0; }
.step-num {
  width: 48px;
  height: 48px;
  margin: 0 auto;
  border-radius: 50%;
  background: var(--color-eager-green);
  color: #fff;
  font-weight: 900;
  font-size: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ---------- Карточки уровней ---------- */
.levels { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.level-card {
  font-family: var(--font-main);
  background: #fff;
  border: 2px solid var(--color-faded-gray);
  border-radius: var(--radius);
  box-shadow: 0 4px 0 var(--color-faded-gray);
  padding: 24px 20px;
  text-align: center;
  cursor: pointer;
  transition: transform 0.05s ease, box-shadow 0.05s ease;
}
.level-card:hover { background: #f7f7f7; }
.level-card:active { transform: translateY(4px); box-shadow: none; }
.level-ic { color: var(--color-eager-green); }
.level-ic .ic { width: 44px; height: 44px; }
.level-card h3 { margin: 8px 0 4px; font-size: 19px; }
.level-card p { margin: 0 0 12px; font-size: 15px; }
.level-bar { height: 12px; background: #e5e5e5; border-radius: 6px; overflow: hidden; margin-bottom: 8px; }
.level-bar i { display: block; height: 100%; background: var(--color-eager-green); border-radius: 6px; }
.level-card small { font-weight: 700; color: var(--color-charcoal); }

/* ---------- Карточки таблиц ---------- */
.schema-cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.schema-card {
  border: 2px solid var(--color-charcoal);
  border-radius: var(--radius);
  box-shadow: 0 4px 0 var(--color-charcoal);
  padding: 20px;
}
.schema-card-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 8px; }
.schema-card-head h3 { margin: 0; font-size: 19px; font-family: var(--font-mono); }
.row-count {
  font-weight: 800;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--color-eager-green);
  background: var(--color-storybook-green);
  border-radius: var(--radius);
  padding: 4px 10px;
  white-space: nowrap;
}
.schema-card p { margin: 0 0 12px; }
.col-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.col-chip {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  background: #f1f1f1;
  border: 2px solid #e0e0e0;
  border-radius: var(--radius);
  padding: 4px 10px;
  color: var(--color-charcoal);
}
.col-chip span { color: var(--color-spark-blue); font-weight: 500; }

/* ---------- Зелёная полоса CTA ---------- */
.cta-band {
  background: var(--color-eager-green);
  border-radius: var(--radius);
  padding: 48px 24px;
  text-align: center;
  margin: 96px 0;
}
.cta-band h2, .cta-band p { color: #fff; }
.cta-band h2 { font-size: 32px; margin: 0 0 8px; }
.cta-band p { color: var(--color-storybook-green); font-size: 19px; margin: 0 0 24px; }

/* ---------- Подвал ---------- */
.footer-band { background: var(--color-eager-green); margin-top: 40px; }
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  color: #fff;
  font-weight: 700;
}
.footer-inner span { color: var(--color-storybook-green); margin-left: 12px; font-weight: 500; }

/* ---------- Список заданий ---------- */
.tasks { display: flex; flex-direction: column; gap: 12px; margin: 24px 0; }
.task-btn {
  font-family: var(--font-main);
  text-align: left;
  font-size: 17px;
  font-weight: 700;
  color: var(--color-charcoal);
  background: #fff;
  border: 2px solid var(--color-faded-gray);
  border-radius: var(--radius);
  box-shadow: 0 4px 0 var(--color-faded-gray);
  padding: 14px 18px;
  cursor: pointer;
}
.task-btn:hover { background: #f7f7f7; }
.task-btn:active { transform: translateY(4px); box-shadow: none; }
.task-btn.done { border-color: var(--color-eager-green); box-shadow: 0 4px 0 var(--color-eager-green); }

/* ---------- Карточки задания ---------- */
.card {
  background: #fff;
  border: 2px solid var(--color-faded-gray);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
}
.card h3 { margin: 0 0 8px; font-size: 19px; }
.card p { margin: 0; color: var(--color-charcoal); white-space: pre-wrap; }

/* ---------- SQL-редактор ---------- */
.editor-shell {
  position: relative;
  background: var(--color-night-ink);
  border: 2px solid var(--color-charcoal);
  border-radius: var(--radius);
}
.editor-layer, .editor-input {
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.6;
  padding: 14px 16px;
  margin: 0;
  border: 0;
  white-space: pre;
  overflow: auto;
  tab-size: 2;
}
.editor-layer {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  color: #e8ecf5;
  scrollbar-width: none;
}
.editor-layer::-webkit-scrollbar { display: none; }
.editor-layer code { font-family: inherit; }
.editor-input {
  position: relative;
  display: block;
  width: 100%;
  min-height: 150px;
  background: transparent;
  color: transparent;
  caret-color: #fff;
  resize: vertical;
  outline: none;
}
.editor-input::selection { background: rgba(28, 176, 246, 0.35); }

/* Токены подсветки */
.tk-kw  { color: #4fc3f7; font-weight: 700; }  /* ключевые слова — Spark Blue */
.tk-str { color: #ffc800; }                    /* строки — жёлтый */
.tk-num { color: #ce82ff; }                    /* числа — фиолетовый */
.tk-com { color: #7a86a1; font-style: italic; }/* комментарии — серый */
.tk-fn  { color: #a5ed6e; font-weight: 700; }  /* функции — Fresh Leaf */

.editor-tip { font-size: 15px; margin-top: 8px; }
.editor-tip b { font-family: var(--font-mono); color: var(--color-charcoal); }

/* Автодополнение */
.autocomplete {
  position: absolute;
  z-index: 20;
  min-width: 230px;
  max-width: 320px;
  max-height: 240px;
  overflow-y: auto;
  background: #fff;
  border: 2px solid var(--color-charcoal);
  border-radius: var(--radius);
  box-shadow: 0 4px 0 var(--color-charcoal);
  padding: 4px;
}
.ac-item {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--color-charcoal);
  background: none;
  border: none;
  border-radius: 8px;
  padding: 8px 10px;
  cursor: pointer;
}
.ac-item.active { background: var(--color-storybook-green); }
.ac-kind {
  font-family: var(--font-main);
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-radius: 6px;
  padding: 2px 6px;
  flex-shrink: 0;
}
.ac-kind.kw { background: #e3f4fd; color: var(--color-spark-blue); }
.ac-kind.tbl { background: #e9fbe0; color: #3d8b00; }
.ac-kind.col { background: #f1f1f1; color: var(--color-pencil-gray); }

/* ---------- Кнопки-ряды, подсказки, результат ---------- */
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 16px; }
.nav-row { justify-content: space-between; align-items: center; }
.prev-next { display: flex; gap: 12px; }

.hint, .answer {
  margin-top: 16px;
  padding: 14px 16px;
  border-radius: var(--radius);
  background: #fffbe8;
  border: 2px solid #ffc800;
  color: var(--color-charcoal);
}
.answer-sql {
  background: var(--color-night-ink);
  border-radius: 8px;
  padding: 14px 16px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  white-space: pre;
  color: #e8ecf5;
}
.answer-sql code { font-family: inherit; }

.result { padding: 14px 16px; border-radius: var(--radius); color: var(--color-charcoal); }
.result-empty { color: var(--color-pencil-gray); }
.result-success { background: #e9fbe0; border: 2px solid var(--color-eager-green); }
.result-error { background: #fdeceb; border: 2px solid #ff6b6b; }
.result-message { font-weight: 800; margin-bottom: 8px; display: flex; align-items: center; gap: 8px; }
.result-message .ic { width: 22px; height: 22px; }
.msg-ok { color: var(--color-eager-green); }
.msg-bad { color: #ff6b6b; }
.level-card small { display: flex; align-items: center; justify-content: center; gap: 6px; }
.level-card small .ic { color: var(--color-eager-green); }
.task-btn { display: flex; align-items: center; }
.footer-inner b { display: inline-flex; align-items: center; gap: 8px; }

.table-wrap {
  max-height: 400px;
  overflow: auto;
  background: #fff;
  border: 2px solid #e0e0e0;
  border-radius: 8px;
  margin-top: 8px;
}
table.result-table { border-collapse: collapse; width: 100%; font-size: 0.9rem; }
.result-table th, .result-table td {
  border: 1px solid #e0e0e0;
  padding: 6px 10px;
  text-align: left;
  white-space: nowrap;
  color: var(--color-charcoal);
}
.result-table th { background: #f1f1f1; position: sticky; top: 0; }

.schema-table { margin-bottom: 16px; }
.schema-table:last-child { margin-bottom: 0; }
.schema-table h4 { margin: 0 0 8px; font-family: var(--font-mono); }

/* ---------- Адаптив ---------- */
@media (max-width: 860px) {
  .hero { flex-direction: column; padding-top: 40px; }
  .hero-text h1 { font-size: 36px; }
  .hero-art { flex: none; height: 260px; }
  .steps, .levels, .schema-cards { grid-template-columns: 1fr; }
  .section { margin: 64px 0; }
  .nav-link { display: none; }
  .nav-row { flex-direction: column; align-items: stretch; }
  .prev-next { justify-content: space-between; }
  .footer-inner { flex-direction: column; text-align: center; }
}