/* Страница OSI. Цвет уровня приходит в переменной --lc из data.js */

/* ===== Вкладки ===== */
.osi-tabs{
  display:flex;
  gap:6px;
  margin-bottom:14px;
  overflow-x:auto;
  scrollbar-width:none;
  border-bottom:1px solid var(--line);
}
.osi-tabs::-webkit-scrollbar{ display:none; }
.osi-tab{
  position:relative;
  appearance:none;
  border:none;
  background:transparent;
  color:var(--muted);
  font:inherit;
  font-size:13px;
  font-weight:600;
  padding:10px 12px 12px;
  cursor:pointer;
  white-space:nowrap;
  transition:color .16s ease;
}
.osi-tab:hover, .osi-tab.active{ color:var(--accent); }
.osi-tab.active::after{
  content:"";
  position:absolute;
  left:12px; right:12px; bottom:-1px;
  height:2px;
  background:var(--accent);
}
.osi-panel{ animation:osiIn .2s ease both; }
@keyframes osiIn{ from{ opacity:0; transform:translateY(4px); } to{ opacity:1; transform:none; } }

/* ===== Общие мелочи ===== */
.osi-card__title{
  font-family:var(--mono);
  font-size:11px;
  color:var(--green);
  text-transform:uppercase;
  letter-spacing:.04em;
  margin-bottom:10px;
}
.osi-chips{ display:flex; flex-wrap:wrap; gap:6px; }
.osi-chip{
  display:inline-flex;
  align-items:center;
  gap:6px;
  border:1px solid var(--line);
  background:var(--bg);
  color:var(--text);
  border-radius:999px;
  padding:4px 10px;
  font:inherit;
  font-size:12px;
  line-height:1.4;
  cursor:default;
}
.osi-chip[title]{ cursor:help; }
.osi-chip--lc{ border-color:color-mix(in srgb, var(--lc) 45%, transparent); color:var(--lc); }
.osi-chip--link, .osi-chip--btn{ cursor:pointer; transition:border-color .16s ease, color .16s ease, background .16s ease; }
.osi-chip--link:hover, .osi-chip--btn:hover{ border-color:var(--accent); color:var(--accent); }
.osi-chip--btn.active{ background:rgba(249,201,64,.08); border-color:rgba(249,201,64,.35); color:var(--accent); }
.osi-chip--layer{ font-family:var(--mono); color:var(--muted); }
.osi-chip--layer.active{
  background:color-mix(in srgb, var(--lc) 14%, transparent);
  border-color:color-mix(in srgb, var(--lc) 55%, transparent);
  color:var(--lc);
}
.osi-chip.is-hit{ border-color:var(--accent); color:var(--accent); box-shadow:0 0 0 3px rgba(249,201,64,.15); }

.osi-list{ margin:0; padding-left:18px; color:var(--text-2); font-size:13px; line-height:1.6; }
.osi-list li + li{ margin-top:4px; }
.osi-list--plain{ list-style:none; padding:0; }
.osi-list--plain b{ color:var(--text); font-weight:600; }
.osi-list li.is-hit, .osi-attacks li.is-hit{
  outline:1px solid var(--accent);
  outline-offset:4px;
  border-radius:4px;
}
.osi-text{ margin:0; color:var(--text-2); font-size:13px; line-height:1.6; }
.osi-text--mono{ font-family:var(--mono); font-size:12px; color:var(--text); }

.osi-attacks{ list-style:none; margin:0; padding:0; display:grid; grid-template-columns:repeat(2, minmax(0,1fr)); gap:12px 18px; }
.osi-attack__name{ font-weight:700; font-size:13px; margin-bottom:3px; }
.osi-attack__note{ color:var(--text-2); font-size:12px; line-height:1.55; }
.osi-attack__def{ color:var(--green); font-size:12px; line-height:1.55; margin-top:4px; }
.osi-attack__def span{ font-family:var(--mono); font-size:11px; color:var(--muted); }

/* ===== Уровни ===== */
.osi-explorer{
  display:grid;
  grid-template-columns:330px minmax(0,1fr);
  gap:16px;
  align-items:start;
}
.osi-side{
  position:sticky;
  top:calc(var(--header-h) + 14px);
  display:flex;
  flex-direction:column;
  gap:10px;
}
.osi-stack{ display:flex; flex-direction:column; gap:6px; }
.osi-layer{
  display:grid;
  grid-template-columns:38px minmax(0,1fr) auto;
  align-items:center;
  gap:10px;
  width:100%;
  text-align:left;
  border:1px solid var(--line);
  border-left:3px solid var(--lc);
  background:var(--panel);
  color:var(--text);
  border-radius:10px;
  padding:9px 12px 9px 10px;
  font:inherit;
  cursor:pointer;
  transition:border-color .16s ease, background .16s ease, transform .16s ease, opacity .16s ease;
}
.osi-layer:hover{ transform:translateX(3px); border-color:color-mix(in srgb, var(--lc) 55%, var(--line)); }
.osi-layer.active{
  background:color-mix(in srgb, var(--lc) 13%, var(--panel));
  border-color:color-mix(in srgb, var(--lc) 70%, transparent);
  transform:translateX(6px);
}
.osi-layer.is-dim{ opacity:.35; }
.osi-layer.is-match{ box-shadow:0 0 0 2px color-mix(in srgb, var(--lc) 40%, transparent); }
.osi-layer__num{
  display:flex;
  align-items:center;
  justify-content:center;
  width:30px;
  height:30px;
  border-radius:8px;
  background:color-mix(in srgb, var(--lc) 18%, transparent);
  color:var(--lc);
  font-family:var(--mono);
  font-weight:700;
  font-size:15px;
}
.osi-layer__name{ font-weight:600; font-size:14px; display:flex; flex-direction:column; min-width:0; }
.osi-layer__name small{ color:var(--muted); font-weight:500; font-size:11px; font-family:var(--mono); }
.osi-layer__pdu{ font-family:var(--mono); font-size:10px; color:var(--muted); text-align:right; max-width:90px; }

.osi-results{ display:flex; flex-direction:column; gap:4px; }
.osi-results:empty{ display:none; }
.osi-result{
  display:grid;
  grid-template-columns:30px minmax(0,1fr) auto;
  align-items:center;
  gap:8px;
  border:1px solid var(--line);
  background:var(--panel-2);
  color:var(--text);
  border-radius:8px;
  padding:6px 10px;
  font:inherit;
  font-size:12px;
  text-align:left;
  cursor:pointer;
}
.osi-result:hover{ border-color:var(--lc); }
.osi-result__layer{ font-family:var(--mono); color:var(--lc); font-weight:700; }
.osi-result__name{ overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.osi-result__kind{ color:var(--muted); font-size:11px; }
.osi-results__empty{ color:var(--muted); font-size:12px; padding:4px 2px; }

.osi-mnem{
  border:1px dashed var(--line);
  border-radius:10px;
  padding:10px 12px;
  font-size:12px;
  color:var(--text-2);
  line-height:1.5;
}
.osi-mnem .osi-card__title{ margin-bottom:6px; }
.osi-mnem__row span{ font-family:var(--mono); font-size:11px; color:var(--muted); }

.osi-detail{ border-top:3px solid var(--lc); padding:20px; }
.osi-detail__head{ display:flex; gap:16px; align-items:flex-start; margin-bottom:12px; }
.osi-detail__num{
  flex:0 0 auto;
  width:64px;
  height:64px;
  border-radius:14px;
  display:flex;
  align-items:center;
  justify-content:center;
  background:color-mix(in srgb, var(--lc) 16%, transparent);
  border:1px solid color-mix(in srgb, var(--lc) 45%, transparent);
  color:var(--lc);
  font-family:var(--mono);
  font-size:32px;
  font-weight:700;
}
.osi-detail__info{ min-width:0; }
.osi-detail__en{ font-family:var(--mono); font-size:11px; color:var(--lc); margin-bottom:2px; }
.osi-detail__title{ margin:0 0 8px; font-size:24px; line-height:1.2; }
.osi-detail__summary{ margin:0 0 16px; color:var(--text-2); font-size:14px; line-height:1.65; max-width:760px; }
.osi-cards{ display:grid; grid-template-columns:repeat(2, minmax(0,1fr)); gap:12px; }
.osi-card{
  background:var(--panel-2);
  border:1px solid var(--line-2);
  border-radius:10px;
  padding:14px;
  min-width:0;
}
.osi-card--wide{ grid-column:1 / -1; }
.osi-detail__nav{ display:flex; justify-content:space-between; gap:10px; margin-top:16px; flex-wrap:wrap; }

/* ===== Инкапсуляция ===== */
.enc{ padding:18px; }
.enc-scene{
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(70px, 160px) minmax(0,1fr);
  gap:12px;
  align-items:stretch;
}
.enc-stack{ display:flex; flex-direction:column; gap:5px; }
.enc-stack__title{ font-family:var(--mono); font-size:11px; color:var(--muted); margin-bottom:4px; }
.enc-stack--recv .enc-stack__title{ text-align:right; }
.enc-row{
  display:flex;
  align-items:center;
  gap:10px;
  border:1px solid var(--line-2);
  border-left:3px solid color-mix(in srgb, var(--lc) 40%, transparent);
  background:var(--panel-2);
  border-radius:8px;
  padding:6px 10px;
  font-size:12px;
  color:var(--muted);
  transition:all .25s ease;
}
.enc-stack--recv .enc-row{ flex-direction:row-reverse; border-left-width:1px; border-right:3px solid color-mix(in srgb, var(--lc) 40%, transparent); }
.enc-row__num{ font-family:var(--mono); font-weight:700; color:color-mix(in srgb, var(--lc) 60%, var(--muted)); }
.enc-row.is-done{ color:var(--text-2); border-color:color-mix(in srgb, var(--lc) 25%, var(--line-2)); }
.enc-row.is-active{
  color:var(--text);
  background:color-mix(in srgb, var(--lc) 16%, var(--panel-2));
  border-color:var(--lc);
  box-shadow:0 0 0 3px color-mix(in srgb, var(--lc) 18%, transparent);
  transform:scale(1.03);
}
.enc-row.is-active .enc-row__num{ color:var(--lc); }

.enc-wire{ position:relative; display:flex; align-items:flex-end; justify-content:center; padding-bottom:16px; }
.enc-wire__line{
  position:absolute;
  left:0; right:0; bottom:28px;
  height:2px;
  background:repeating-linear-gradient(90deg, var(--line) 0 8px, transparent 8px 14px);
}
.enc-wire__label{ font-family:var(--mono); font-size:10px; color:var(--muted); }
.enc-wire__dot{
  position:absolute;
  bottom:23px;
  left:0;
  width:12px; height:12px;
  border-radius:50%;
  background:#d68fe0;
  box-shadow:0 0 12px #d68fe0;
  opacity:0;
}
.enc-wire.is-active .enc-wire__line{ background:repeating-linear-gradient(90deg, #d68fe0 0 8px, transparent 8px 14px); }
.enc-wire.is-active .enc-wire__dot{ opacity:1; animation:encDot 1.6s linear infinite; }
.enc-wire.is-past .enc-wire__dot{ opacity:0; }
@keyframes encDot{ from{ left:0; } to{ left:calc(100% - 12px); } }

.enc-progress{ height:3px; background:var(--line-2); border-radius:3px; margin:16px 0 14px; overflow:hidden; }
.enc-progress span{ display:block; height:100%; background:var(--accent); transition:width .3s ease; }

.enc-meta{ display:flex; gap:12px; flex-wrap:wrap; font-family:var(--mono); font-size:11px; }
.enc-counter{ color:var(--accent); }
.enc-where{ color:var(--muted); }
.enc-title{ margin:6px 0 6px; font-size:19px; }
.enc-text{ margin:0; color:var(--text-2); font-size:14px; line-height:1.65; max-width:820px; min-height:3.3em; }

.enc-packet-wrap{ margin-top:16px; }
.enc-packet{ display:flex; gap:4px; min-height:62px; }
.enc-block{
  flex:1 1 0;
  min-width:0;
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  justify-content:center;
  gap:2px;
  border:1px solid color-mix(in srgb, var(--lc) 55%, transparent);
  background:color-mix(in srgb, var(--lc) 14%, var(--panel-2));
  color:var(--text);
  border-radius:8px;
  padding:8px 10px;
  font:inherit;
  text-align:left;
  cursor:pointer;
  transition:transform .16s ease, box-shadow .16s ease, opacity .25s ease;
  animation:encIn .35s ease both;
}
.enc-block:hover{ transform:translateY(-2px); }
.enc-block.is-picked{ box-shadow:0 0 0 2px var(--lc); }
.enc-block.is-added{ box-shadow:0 0 0 2px color-mix(in srgb, var(--lc) 60%, transparent), 0 0 18px color-mix(in srgb, var(--lc) 35%, transparent); }
.enc-block.is-strip{ opacity:.55; border-style:dashed; }
.enc-block.is-picked.is-added{ box-shadow:0 0 0 2px var(--lc); }
.enc-block__layer{ font-family:var(--mono); font-size:10px; color:var(--lc); }
.enc-block__label{ font-family:var(--mono); font-size:12px; font-weight:700; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; max-width:100%; }
.enc-block__tag{ font-size:10px; color:var(--text-2); }
@keyframes encIn{ from{ opacity:0; transform:translateY(6px); } to{ opacity:1; transform:none; } }
.enc-block.is-strip{ animation:none; }
.enc-bits{
  flex:1;
  display:flex;
  align-items:center;
  border:1px solid color-mix(in srgb, var(--lc) 45%, transparent);
  background:color-mix(in srgb, var(--lc) 8%, var(--panel-2));
  border-radius:8px;
  padding:10px 12px;
  font-family:var(--mono);
  font-size:12px;
  color:var(--lc);
  letter-spacing:.06em;
  overflow:hidden;
  white-space:nowrap;
  animation:encIn .35s ease both;
}

.enc-fields-box{
  margin-top:12px;
  background:var(--panel-2);
  border:1px solid color-mix(in srgb, var(--lc) 40%, var(--line-2));
  border-radius:10px;
  padding:12px 14px;
}
.enc-fields{ width:100%; border-collapse:collapse; font-size:13px; }
.enc-fields th, .enc-fields td{ text-align:left; padding:6px 8px; border-bottom:1px solid var(--line-2); vertical-align:top; }
.enc-fields tr:last-child th, .enc-fields tr:last-child td{ border-bottom:none; }
.enc-fields th{ color:var(--muted); font-weight:500; width:42%; }
.enc-fields td{ font-family:var(--mono); font-size:12px; color:var(--text); }

.enc-controls{ display:flex; flex-wrap:wrap; gap:8px; justify-content:flex-end; margin-top:16px; }

/* ===== OSI и TCP/IP ===== */
.tcp-grid{
  display:grid;
  grid-template-columns:minmax(0,1.1fr) minmax(0,1fr) minmax(0,1fr);
  grid-template-rows:auto repeat(7, minmax(46px, auto));
  gap:6px 12px;
}
.tcp-head{ font-family:var(--mono); font-size:11px; color:var(--green); text-transform:uppercase; letter-spacing:.04em; padding-bottom:4px; grid-row:1; }
.tcp-osi{
  grid-column:1;
  display:grid;
  grid-template-columns:34px minmax(0,1fr) auto;
  align-items:center;
  gap:8px;
  border:1px solid var(--line);
  border-left:3px solid var(--lc);
  background:var(--panel-2);
  color:var(--text);
  border-radius:8px;
  padding:8px 12px;
  font:inherit;
  font-size:13px;
  text-align:left;
  cursor:pointer;
  transition:background .16s ease, border-color .16s ease;
}
.tcp-osi__num{ font-family:var(--mono); color:var(--lc); font-weight:700; }
.tcp-osi small{ color:var(--muted); font-family:var(--mono); font-size:10px; }
.tcp-osi.is-lit{ background:color-mix(in srgb, var(--lc) 15%, var(--panel-2)); border-color:var(--lc); }
.tcp-model{
  grid-column:2;
  display:flex;
  flex-direction:column;
  justify-content:center;
  gap:2px;
  border:1px solid var(--line);
  background:var(--panel-2);
  border-radius:8px;
  padding:10px 14px;
  font-size:14px;
  outline:none;
  transition:background .16s ease, border-color .16s ease;
}
.tcp-model small{ color:var(--muted); font-family:var(--mono); font-size:10px; }
.tcp-model__layers{ font-family:var(--mono); font-size:10px; color:var(--violet); margin-top:4px; }
.tcp-model.is-lit, .tcp-model:focus{ background:rgba(249,201,64,.07); border-color:rgba(249,201,64,.4); }
.tcp-ex{
  grid-column:3;
  display:flex;
  align-items:center;
  border-left:1px dashed var(--line);
  padding:0 0 0 14px;
  font-family:var(--mono);
  font-size:12px;
  color:var(--text-2);
  line-height:1.6;
}
.tcp-notes{ margin-top:18px; }

/* ===== Атаки ===== */
.atk-toolbar{ display:grid; grid-template-columns:minmax(200px, 340px) minmax(0,1fr) auto; align-items:center; gap:12px; margin-bottom:14px; }
.atk-counter{ font-family:var(--mono); font-size:11px; color:var(--muted); white-space:nowrap; }
.atk-list{ display:flex; flex-direction:column; gap:16px; }
.atk-group__head{
  display:flex;
  align-items:baseline;
  gap:10px;
  appearance:none;
  border:none;
  background:none;
  color:var(--text);
  font:inherit;
  font-size:16px;
  font-weight:700;
  padding:0;
  margin-bottom:8px;
  cursor:pointer;
}
.atk-group__head:hover{ color:var(--lc); }
.atk-group__head small{ color:var(--muted); font-family:var(--mono); font-size:11px; font-weight:400; }
.atk-group__num{ font-family:var(--mono); color:var(--lc); }
.atk-cards{ display:grid; grid-template-columns:repeat(auto-fill, minmax(260px, 1fr)); gap:10px; }
.atk-card{
  background:var(--panel);
  border:1px solid var(--line);
  border-top:2px solid var(--lc);
  border-radius:10px;
  padding:12px 14px;
}

/* ===== Тренажёр ===== */
.quiz{ padding:18px; }
.quiz-top{ display:flex; justify-content:space-between; align-items:center; gap:12px; flex-wrap:wrap; margin-bottom:18px; }
.quiz-score{ display:flex; gap:14px; font-family:var(--mono); font-size:12px; color:var(--muted); }
.quiz-score b{ color:var(--accent); }
.quiz-card{
  text-align:center;
  padding:22px 12px 20px;
  border:1px dashed var(--line);
  border-radius:12px;
  background:var(--panel-2);
  margin-bottom:14px;
}
.quiz-kind{ font-family:var(--mono); font-size:11px; color:var(--green); text-transform:uppercase; letter-spacing:.04em; }
.quiz-q{ color:var(--text-2); font-size:14px; margin:8px 0 6px; }
.quiz-name{ font-family:var(--mono); font-size:clamp(22px, 4vw, 32px); font-weight:700; line-height:1.25; }
.quiz-empty{ color:var(--muted); font-size:14px; }
.quiz-answers{ display:grid; grid-template-columns:repeat(7, minmax(0,1fr)); gap:6px; }
.quiz-btn{
  position:relative;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:4px;
  border:1px solid var(--line);
  border-bottom:3px solid var(--lc);
  background:var(--panel-2);
  color:var(--text);
  border-radius:10px;
  padding:10px 4px 9px;
  font:inherit;
  font-size:12px;
  cursor:pointer;
  transition:transform .14s ease, background .14s ease, opacity .2s ease;
}
.quiz-btn:hover:not(:disabled){ transform:translateY(-2px); background:color-mix(in srgb, var(--lc) 12%, var(--panel-2)); }
.quiz-btn:disabled{ cursor:default; opacity:.45; }
.quiz-btn__num{ font-family:var(--mono); font-size:20px; font-weight:700; color:var(--lc); }
.quiz-btn kbd{ display:none; }
.quiz-btn.is-right{ opacity:1; background:rgba(97,209,173,.14); border-color:var(--green); }
.quiz-btn.is-wrong{ opacity:1; background:rgba(255,143,143,.12); border-color:var(--danger); }
.quiz-fb{
  margin-top:14px;
  border-radius:10px;
  padding:12px 14px;
  font-size:14px;
  line-height:1.55;
  border:1px solid;
}
.quiz-fb.is-ok{ border-color:rgba(97,209,173,.45); background:rgba(97,209,173,.07); }
.quiz-fb.is-ok b{ color:var(--green); }
.quiz-fb.is-bad{ border-color:rgba(255,143,143,.45); background:rgba(255,143,143,.06); }
.quiz-fb.is-bad b{ color:var(--danger); }
.quiz-fb__note{ color:var(--text-2); font-size:13px; margin-top:4px; }
.quiz-fb__link{ appearance:none; border:none; background:none; padding:0; margin-top:6px; color:var(--lc); font:inherit; font-size:12px; cursor:pointer; }
.quiz-fb__link:hover{ text-decoration:underline; }
.quiz-controls{ display:flex; justify-content:space-between; gap:8px; margin-top:14px; flex-wrap:wrap; }
.quiz-hint{ margin-top:12px; font-family:var(--mono); font-size:11px; color:var(--muted); }

/* ===== Адаптив ===== */
@media (max-width: 900px){
  .osi-explorer{ grid-template-columns:1fr; }
  .osi-side{ position:static; }
  .osi-layer:hover, .osi-layer.active{ transform:none; }
  .osi-detail{ padding:16px; scroll-margin-top:calc(var(--header-h) + 10px); }
  .osi-cards, .osi-attacks{ grid-template-columns:1fr; }
  .enc-scene{ grid-template-columns:minmax(0,1fr) 34px minmax(0,1fr); gap:6px; }
  .enc-row{ padding:5px 7px; gap:6px; font-size:11px; }
  .enc-wire__label{ display:none; }
  .enc-packet{ flex-wrap:wrap; }
  .enc-block{ flex-basis:30%; }
  .atk-toolbar{ grid-template-columns:1fr; }
  .tcp-grid{ grid-template-columns:minmax(0,1.2fr) minmax(0,1fr); }
  .tcp-ex, .tcp-head--ex{ display:none; }
  .quiz-answers{ grid-template-columns:repeat(4, minmax(0,1fr)); }
  .quiz-tabs-hint, .quiz-hint{ display:none; }
}
@media (max-width: 560px){
  .osi-detail__head{ gap:12px; }
  .osi-detail__num{ width:48px; height:48px; font-size:24px; border-radius:10px; }
  .osi-detail__title{ font-size:20px; }
  .enc{ padding:12px; }
  .enc-row__name{ overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
  .enc-controls .btn{ flex:1 1 auto; }
  .tcp-osi small{ display:none; }
  .tcp-osi{ padding:8px; grid-template-columns:28px minmax(0,1fr); }
  .tcp-model{ padding:8px 10px; font-size:13px; }
}
@media (prefers-reduced-motion: reduce){
  .osi-panel, .enc-block, .enc-bits{ animation:none; }
  .enc-wire.is-active .enc-wire__dot{ animation:none; left:50%; }
}