:root {
  --bg: #050505;
  --bg2: #0b0b0b;
  --bg3: #161616;
  --border: #2c2c2c;
  --border2: #3d3d3d;
  --text: #e8e8e8;
  --muted: #8a8a8a;
  --dim: #555;
  --white: #ffffff;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  background-color: var(--bg);
  /* halftone-паттерн как в референсах */
  background-image: radial-gradient(#141414 1px, transparent 1px);
  background-size: 14px 14px;
  color: var(--text);
  font-family: "Courier New", ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 14px;
}
.layout { display: flex; min-height: 100vh; }

/* ===== Sidebar ===== */
.sidebar {
  width: 230px; flex-shrink: 0;
  background: var(--bg2);
  border-right: 1px solid var(--border);
  padding: 18px 12px;
  position: sticky; top: 0; height: 100vh;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  padding: 0 6px 16px;
  font-weight: 700; font-size: 15px;
  letter-spacing: 3px; text-transform: uppercase;
  color: var(--white);
}
.logo img {
  width: 40px; height: 40px; object-fit: cover;
  border: 1px solid var(--border2);
}
.nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 10px; cursor: pointer;
  color: var(--muted); margin-bottom: 2px; user-select: none;
  border: 1px solid transparent;
  text-transform: uppercase; letter-spacing: 1px; font-size: 12px;
}
.nav-item .glyph { font-size: 16px; width: 20px; text-align: center; font-family: serif; }
.nav-item:hover { color: var(--text); border-color: var(--border); }
.nav-item.active {
  color: var(--white); background: var(--bg3);
  border: 1px solid var(--border2); font-weight: 700;
}
.nav-item .badge {
  margin-left: auto; background: var(--white); color: #000;
  font-size: 11px; padding: 1px 7px; font-weight: 700;
}

/* ===== Main ===== */
.main { flex: 1; padding: 24px 28px; max-width: 1200px; }
h1 {
  font-size: 18px; margin-bottom: 18px;
  text-transform: uppercase; letter-spacing: 4px; font-weight: 700;
  border-bottom: 1px solid var(--border); padding-bottom: 10px;
}
h1::before { content: "// "; color: var(--dim); }
h2 { font-size: 13px; margin: 18px 0 10px; color: var(--muted); font-weight: 700;
     text-transform: uppercase; letter-spacing: 2px; }

.grid { display: grid; gap: 14px; }
.grid.cols2 { grid-template-columns: 1fr 1fr; }
.grid.cols3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) {
  .grid.cols2, .grid.cols3 { grid-template-columns: 1fr; }
  .grid.cols4 { grid-template-columns: 1fr 1fr; }
  .sidebar { width: 62px; }
  .sidebar .label, .logo { display: none; }
}

.card {
  background: var(--bg2);
  border: 1px solid var(--border);
  padding: 16px;
}
.card .title {
  color: var(--muted); font-size: 11px; text-transform: uppercase;
  letter-spacing: 2px; margin-bottom: 8px;
}
.card .title::before { content: "▚ "; color: var(--dim); }
.big { font-size: 26px; font-weight: 700; color: var(--white); }
.sub { color: var(--muted); font-size: 12px; margin-top: 4px; }

/* ===== Forms ===== */
input, select, textarea, button {
  font: inherit; color: var(--text);
  background: var(--bg3); border: 1px solid var(--border);
  border-radius: 0; padding: 8px 10px; outline: none;
}
input:focus, select:focus, textarea:focus { border-color: var(--white); }
textarea { width: 100%; resize: vertical; min-height: 70px; }
button {
  cursor: pointer; background: var(--white); border: 1px solid var(--white);
  color: #000; font-weight: 700; padding: 8px 14px;
  text-transform: uppercase; letter-spacing: 1px; font-size: 12px;
}
button:hover { background: #cfcfcf; border-color: #cfcfcf; }
button.ghost { background: transparent; color: var(--text); border: 1px solid var(--border2); }
button.ghost:hover { border-color: var(--white); color: var(--white); background: transparent; }
button.danger { background: transparent; color: var(--dim); border: none; padding: 4px 6px; }
button.danger:hover { color: var(--white); }
button.small { padding: 4px 10px; font-size: 11px; }
.row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.row > input, .row > select { flex: 1; min-width: 100px; }

/* ===== Lists & tables ===== */
table { width: 100%; border-collapse: collapse; }
th { text-align: left; color: var(--muted); font-size: 11px; font-weight: 700;
     text-transform: uppercase; letter-spacing: 1px;
     padding: 6px 8px; border-bottom: 1px solid var(--border2); }
td { padding: 7px 8px; border-bottom: 1px solid var(--border); }
tr:last-child td { border-bottom: none; }

.list-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px; border-bottom: 1px solid var(--border);
}
.list-item:last-child { border-bottom: none; }
.list-item .grow { flex: 1; }

.tag {
  display: inline-block; background: transparent; border: 1px solid var(--border2);
  padding: 2px 10px; font-size: 11px; color: #bdbdbd;
  margin: 2px 3px 2px 0; letter-spacing: 1px;
}
.pill {
  padding: 2px 10px; font-size: 11px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 1px;
  border: 1px solid var(--border2); color: var(--muted);
}
.pill.open { color: var(--white); border-color: var(--white); }
.pill.in_progress { color: #bdbdbd; border-color: var(--border2); border-style: dashed; }
.pill.done { color: var(--dim); border-color: var(--border); text-decoration: line-through; }
.pill.overdue { background: var(--white); color: #000; border-color: var(--white); }

.money-plus { color: var(--white); font-weight: 700; }
.money-plus::before { content: "▲ "; font-size: 10px; }
.money-minus { color: var(--muted); font-weight: 700; }
.money-minus::before { content: "▼ "; font-size: 10px; }
.muted { color: var(--muted); }
.mt { margin-top: 14px; }

/* ===== Progress ===== */
.progress {
  background: var(--bg3); height: 10px; overflow: hidden;
  border: 1px solid var(--border);
}
.progress > div {
  height: 100%;
  background: repeating-linear-gradient(135deg, var(--white) 0 6px, #9a9a9a 6px 12px);
}

pre {
  background: #000; border: 1px solid var(--border); border-left: 3px solid var(--border2);
  padding: 12px; overflow-x: auto; font-size: 12.5px; margin-top: 8px;
  white-space: pre-wrap; color: #cfcfcf;
}
.checkbox { width: 16px; height: 16px; accent-color: #ffffff; flex: none; }
.clickable { cursor: pointer; }
.section { display: none; }
.section.active { display: block; }
.flashcard {
  background: var(--bg2); border: 1px solid var(--border2);
  padding: 40px 30px; text-align: center; font-size: 17px; min-height: 160px;
  display: flex; flex-direction: column; justify-content: center; gap: 16px;
}
.toast {
  position: fixed; bottom: 20px; right: 20px; background: #000;
  border: 1px solid var(--white); padding: 12px 18px;
  opacity: 0; transition: opacity .3s; pointer-events: none; z-index: 99;
  text-transform: uppercase; font-size: 12px; letter-spacing: 1px;
}
.toast.show { opacity: 1; }
details summary { cursor: pointer; color: #bdbdbd; margin: 8px 0;
                  text-transform: uppercase; font-size: 11px; letter-spacing: 1px; }
details summary:hover { color: var(--white); }

/* ===== Login ===== */
.login-wrap {
  display: flex; align-items: center; justify-content: center;
  min-height: 100vh; gap: 0;
}
.login-card {
  width: min(340px, 92vw); border: 1px solid var(--border2); background: var(--bg2);
  padding: 0 0 24px;
}
.login-card img { width: 100%; display: block; border-bottom: 1px solid var(--border2); }
.login-inner { padding: 20px 24px 0; text-align: center; }
.login-title {
  font-size: 14px; letter-spacing: 4px; text-transform: uppercase;
  font-weight: 700; color: var(--white); margin-bottom: 14px;
}

/* --- Детали учебной задачи (Кодекс) --- */
.study-details {
  border: 1px solid var(--border);
  border-left: 3px solid var(--border2);
  background: var(--bg2);
  padding: 12px 14px;
  margin: 2px 0 8px 26px;
  font-size: 13px;
}
.study-details p { margin: 6px 0; color: var(--text); }
.study-details textarea { width: 100%; margin-top: 4px; }

/* ============================================================
   МОБИЛЬНАЯ ВЕРСИЯ (телефоны, ≤ 720px)
   Сайдбар становится нижней навигацией, формы — под палец.
   ============================================================ */
@media (max-width: 720px) {

  body { font-size: 13px; }

  /* --- каркас: колонка, навигация прибита снизу --- */
  .layout { flex-direction: column; }
  .sidebar {
    position: fixed; top: auto; bottom: 0; left: 0; right: 0;
    width: 100%; height: auto;
    display: flex; flex-direction: row; align-items: stretch;
    padding: 0;
    background: #000;
    border-right: none; border-top: 1px solid var(--border2);
    z-index: 50;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .sidebar::-webkit-scrollbar { display: none; }
  .logo { display: none; }

  .nav-item {
    position: relative;
    flex: 1 0 auto;
    flex-direction: column; justify-content: center; align-items: center;
    gap: 3px;
    min-width: 52px;
    margin: 0;
    padding: 9px 7px calc(9px + env(safe-area-inset-bottom, 0px));
    border: none;
    font-size: 8px; letter-spacing: .5px;
  }
  .nav-item .glyph { font-size: 19px; width: auto; }
  .sidebar .label { display: block; white-space: nowrap; }
  .nav-item:hover { border: none; }
  .nav-item.active {
    border: none;
    background: var(--bg3);
    box-shadow: inset 0 2px 0 var(--white);
  }
  .nav-item .badge {
    position: absolute; top: 3px; right: 6px;
    margin-left: 0; font-size: 9px; padding: 0 5px;
  }

  /* --- контент --- */
  .main { padding: 14px 12px 86px; max-width: 100%; }
  h1 { font-size: 15px; letter-spacing: 2px; margin-bottom: 14px; }
  h2 { letter-spacing: 1px; }
  .grid { gap: 10px; }
  .grid.cols4 { grid-template-columns: 1fr 1fr; }
  .card { padding: 13px; }
  .big { font-size: 21px; }

  /* --- формы: крупные поля, кнопки во всю ширину --- */
  input, select, textarea { font-size: 16px; padding: 10px 12px; } /* 16px = без авто-зума iOS */
  button { padding: 11px 14px; }
  button.small { padding: 6px 10px; font-size: 11px; }
  button.danger { padding: 6px 8px; }
  .row > input, .row > select {
    flex: 1 1 130px;
    max-width: 100% !important;
    min-width: 0;
  }
  .row > input[type="date"], .row > input[type="month"],
  .row > input[type="datetime-local"] { flex: 1 1 100%; }
  .row > button { flex: 1 1 100%; }
  .row > button.small, .row > button.danger { flex: 0 0 auto; }

  /* --- таблицы: горизонтальная прокрутка вместо ломания --- */
  table { display: block; overflow-x: auto; white-space: nowrap; }
  th, td { padding: 8px 8px; }

  /* --- списки: разрешаем перенос плашек --- */
  .list-item { flex-wrap: wrap; row-gap: 4px; padding: 10px 8px; }
  .list-item .grow { flex: 1 1 55%; min-width: 0; overflow-wrap: break-word; }

  /* --- учёба: детали задач без отступа слева --- */
  .study-details { margin-left: 0; padding: 10px 10px; }

  /* --- карточки повторения --- */
  .flashcard { padding: 26px 16px; min-height: 130px; font-size: 15px; }

  /* --- код в сниппетах --- */
  pre { font-size: 11.5px; padding: 10px; }

  /* --- тосты над нижней навигацией --- */
  .toast {
    left: 12px; right: 12px; bottom: 76px;
    text-align: center;
  }

  /* --- логин --- */
  .login-wrap { padding: 16px; align-items: flex-start; padding-top: 6vh; }
}

/* совсем узкие экраны: карточки дашборда в один столбец */
@media (max-width: 360px) {
  .grid.cols4 { grid-template-columns: 1fr; }
  .nav-item { min-width: 46px; }
}

/* --- раскрываемые заметки в таблицах --- */
.note-toggle { cursor: pointer; border-bottom: 1px dashed var(--dim); }
.note-toggle:hover { color: var(--text); }