/* CHEMIA LEKCJE */

:root {
  --blue: #05b;
  --blue-light: #3d8fe6;
  --blue-mid: #1a73d4;
  --blue-dark: #004a9c;
  --blue-edge: #003a7a;
  --steel-hi: #f7f9fb;
  --steel-1: #e6eaee;
  --steel-2: #d2d8de;
  --steel-3: #bfc7cf;
  --steel-line: #9aa4ae;
  --steel-dark: #5d6873;
  --steel-darker: #3f4852;
  --ink: #1d242b;

  --sans: "Lucida Grande", "Lucida Sans Unicode", Tahoma, Verdana, sans-serif;
  --serif: Georgia, "Times New Roman", serif;
  --pad: 20px;

  --blue-gloss: linear-gradient(to bottom,
    #4a9bf0 0%, #2a80dd 49%, #05b 50%, #004a9c 100%);
  --btn: linear-gradient(to bottom,
    #ffffff 0%, #eef1f4 50%, #dbe0e5 50%, #e8ecef 100%);
  --btn-hover: linear-gradient(to bottom,
    #3d8fe6 0%, #1a73d4 50%, #05b 50%, #004a9c 100%);
}

html {
  background-color: #aab3bc;
  background-image:
    repeating-linear-gradient(90deg,
      rgba(255, 255, 255, .13) 0, rgba(255, 255, 255, .13) 1px,
      rgba(0, 0, 0, .05) 1px, rgba(0, 0, 0, .05) 2px,
      rgba(255, 255, 255, 0) 2px, rgba(255, 255, 255, 0) 4px),
    linear-gradient(to bottom, #c9d0d7 0%, #aab3bc 100%);
  min-height: 100%;
}

body {
  box-sizing: border-box;
  max-width: 800px;
  margin: 24px auto;
  padding: 0 var(--pad) 28px;
  font-family: var(--serif);
  font-size: 16px;
  line-height: 1.6;
  text-align: justify;
  hyphens: auto;
  color: var(--ink);
  background:
    repeating-linear-gradient(90deg,
      rgba(255, 255, 255, .3) 0, rgba(255, 255, 255, .3) 1px,
      rgba(0, 0, 0, .015) 1px, rgba(0, 0, 0, .015) 2px,
      rgba(255, 255, 255, 0) 2px, rgba(255, 255, 255, 0) 4px),
    linear-gradient(to bottom, #f5f7f9 0%, #e6eaee 100%);
  border: 1px solid #6c7782;
  outline: 1px solid #f4f6f8;
  outline-offset: -2px;
}

/* ---------- pasek języków ---------- */
body > span:first-child {
  display: block;
  margin: 0 calc(-1 * var(--pad));
  padding: 6px 14px;
  font-family: var(--sans);
  font-size: 12px;
  line-height: 1.5;
  text-align: right;
  hyphens: manual;
  color: var(--steel-darker);
  background: linear-gradient(to bottom,
    #fdfdfe 0%, #e9edf0 50%, #d6dce1 50%, #e3e7eb 100%);
  border-bottom: 1px solid var(--steel-line);
}

body > span:first-child a {
  display: inline-block;
  margin: 0 1px;
  padding: 1px 8px;
  color: var(--blue);
  text-decoration: none;
  background: var(--btn);
  border: 1px solid var(--steel-line);
  border-top-color: #fff;
  border-left-color: #cfd5db;
}

body > span:first-child a:hover {
  color: #fff;
  background: var(--btn-hover);
  border-color: var(--blue-edge);
}

/* ---------- pasek nawigacji (Spis treści / następna lekcja) ---------- */
p#c {
  margin: 0 calc(-1 * var(--pad));
  padding: 6px 14px;
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.8;
  text-align: center;
  hyphens: manual;
  color: var(--steel-darker);
  background: linear-gradient(to bottom, #e9edf0 0%, #d3d9df 100%);
  border-top: 1px solid #fff;
  border-bottom: 1px solid var(--steel-line);
}

p#c + p#c {
  border-top: 0;
}

p#c a {
  display: inline-block;
  padding: 1px 10px;
  color: var(--blue);
  text-decoration: none;
  background: var(--btn);
  border: 1px solid var(--steel-line);
  border-top-color: #fff;
  border-left-color: #cfd5db;
}

p#c a:hover,
p#c a:focus-visible {
  color: #fff;
  background: var(--btn-hover);
  border-color: var(--blue-edge);
}

/* ---------- tytuł lekcji: błyszczący niebieski pasek ---------- */
h1 {
  margin: 0 calc(-1 * var(--pad)) 0;
  padding: 18px var(--pad) 16px;
  font-family: var(--sans);
  font-size: 26px;
  line-height: 1.25;
  font-weight: bold;
  text-align: left;
  hyphens: manual;
  color: #fff;
  background: var(--blue-gloss);
  border-top: 1px solid #8cc4ff;
  border-bottom: 1px solid var(--blue-edge);
}

h1 + p {
  margin-top: 20px;
}

/* ---------- nagłówki sekcji ---------- */
h2 {
  clear: both;
  margin: 30px 0 14px;
  padding: 6px 12px;
  font-family: var(--sans);
  font-size: 19px;
  line-height: 1.3;
  text-align: left;
  hyphens: manual;
  color: var(--ink);
  background: linear-gradient(to bottom,
    #ffffff 0%, #eef1f4 50%, #d5dbe0 50%, #e4e8ec 100%);
  border: 1px solid var(--steel-line);
  border-left: 8px solid var(--blue);
  border-top-color: #fff;
}

h3 {
  clear: both;
  margin: 24px 0 10px;
  padding: 3px 10px;
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.3;
  text-align: left;
  hyphens: manual;
  color: var(--blue);
  background: linear-gradient(to bottom, #ffffff 0%, #e3e7eb 100%);
  border: 1px solid var(--steel-3);
  border-left: 4px solid var(--blue);
  border-top-color: #fff;
}

/* zgodność ze starym arkuszem */
h1#c, h2#c {
  text-align: center;
}

/* ---------- tekst ---------- */
p {
  margin: 12px 0;
}

b, strong {
  color: var(--ink);
}

a {
  color: var(--blue);
  text-decoration: underline;
}

a:hover {
  color: #fff;
  background: var(--blue);
  text-decoration: none;
}

a:visited {
  color: #4a3f9a;
}

a:visited:hover {
  color: #fff;
}

a:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 1px;
}

sub, sup {
  line-height: 0;
}

code, kbd {
  padding: 0 4px;
  font-family: Consolas, "Courier New", monospace;
  font-size: .92em;
  background: var(--steel-1);
  border: 1px solid var(--steel-3);
}

/* wcięcie: linia graweru */
hr {
  height: 2px;
  margin: 24px 0;
  border: 0;
  background: linear-gradient(to bottom,
    var(--steel-line) 0, var(--steel-line) 1px, #fff 1px, #fff 2px);
}

/* ---------- listy ---------- */
ul {
  list-style: none;
  margin: 12px 0;
  padding: 0 0 0 6px;
}

ul > li {
  position: relative;
  margin: 5px 0;
  padding-left: 22px;
}

/* punktor: ostry, błyszczący niebieski kwadrat */
ul > li::before {
  content: "";
  position: absolute;
  left: 3px;
  top: .62em;
  width: 7px;
  height: 7px;
  background: linear-gradient(to bottom,
    #5aa5f2 0%, #1a73d4 50%, #05b 50%, #004a9c 100%);
  border: 1px solid var(--blue-edge);
}

ol {
  margin: 12px 0;
  padding-left: 2.2em;
}

ol > li {
  margin: 5px 0;
  padding-left: 4px;
}

ol > li::marker {
  font-family: var(--sans);
  font-weight: bold;
  color: var(--blue);
}

ol ol {
  margin: 6px 0;
}

/* ---------- ramki: .z (czerwona - uwaga) i .zz (zielona - dodatek) ---------- */
.z, .zz {
  display: flow-root;
  margin: 18px 0;
  padding: 2px 14px;
  hyphens: manual;
  border-style: solid;
  border-width: 1px 1px 1px 10px;
}

.z {
  border-color: #8f0000;
  border-left-color: #e00;
  background: linear-gradient(to bottom,
    #ffffff 0, #ffffff 3px, #fff4f2 3px, #fbdcd7 100%);
}

.zz {
  border-color: #04501f;
  border-left-color: #083;
  background: linear-gradient(to bottom,
    #ffffff 0, #ffffff 3px, #f0faf3 3px, #d3ebdb 100%);
}

.z p, .zz p {
  margin: 10px 0;
}

.z ul, .zz ul,
.z ol, .zz ol {
  margin: 8px 0 12px;
}

/* ---------- tabele ---------- */
table {
  width: 100%;
  margin: 18px 0;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 15px;
  line-height: 1.5;
  text-align: left;
  hyphens: manual;
  border: 1px solid #5d6873;
}

th {
  padding: 7px 10px;
  font-family: var(--sans);
  font-size: 14px;
  text-align: left;
  color: #fff;
  background: var(--blue-gloss);
  border-top: 1px solid #8cc4ff;
  border-bottom: 1px solid var(--blue-edge);
}

th + th {
  border-left: 1px solid rgba(255, 255, 255, .3);
}

td {
  padding: 7px 10px;
  vertical-align: top;
  background: #f6f8fa;
  border-top: 1px solid #fff;
  border-bottom: 1px solid #c5ccd3;
}

td + td {
  border-left: 1px solid #c5ccd3;
}

tbody tr:nth-child(even) td {
  background: #e9edf0;
}

tbody tr:last-child td {
  border-bottom: 0;
}

/* stary wariant table.b - ta sama tabela, bez dodatkowych reguł */
table.b td, table.b th {
  padding: 7px 10px;
}

table.b td {
  vertical-align: middle;
}

/* ---------- obrazy i podpisy ---------- */
img {
  box-sizing: border-box;
  max-width: 100%;
  height: auto;
  padding: 3px;
  background: #fff;
  border: 1px solid var(--steel-line);
}

td img {
  display: block;
  padding: 0;
  border: 0;
}

img#c {
  display: block;
  margin-left: auto;
  margin-right: auto;
}

#l, #r {
  width: 180px;
  margin-bottom: 12px;
  font-family: var(--sans);
  line-height: 1.3;
  text-align: center;
  hyphens: manual;
}

#l {
  float: left;
  margin-right: 20px;
}

#r {
  float: right;
  margin-left: 20px;
}

#l img, #r img {
  display: block;
  width: 100%;
}

/* podpis pod zdjęciem: metalowa listewka */
span#c {
  display: block;
  padding: 4px 8px;
  text-align: center;
  color: var(--steel-darker);
  background: linear-gradient(to bottom, #e9edf0 0%, #d3d9df 100%);
  border: 1px solid var(--steel-line);
  border-top: 0;
}

/* Ułamek pionowy: <span class="ulamek"><span>licznik</span><span>mianownik</span></span> */
.ulamek {
  display: inline-flex;
  flex-direction: column;
  vertical-align: middle;
  text-align: center;
  line-height: 1.2;
  margin: 0 0.15em;
}
.ulamek > span {
  padding: 0 0.25em;
}
.ulamek > span:first-child {
  border-bottom: 1px solid currentColor;
}

/* Listy obok obrazów (#l, #r): lista tworzy własny blok i nie wchodzi pod float,
   dzięki czemu kropki i numery pozostają poza obrazem */
ul, ol {
  display: flow-root;
}

/* ---------- małe ekrany ---------- */
@media (max-width: 800px) {
  :root {
    --pad: 14px;
  }
  body {
    margin: 0;
    border-left: 0;
    border-right: 0;
  }
  h1 {
    font-size: 22px;
  }
}

@media (max-width: 560px) {
  body {
    font-size: 15px;
    text-align: left;
  }
  #l, #r {
    float: none;
    width: auto !important;
    margin: 14px 0;
  }
  td, th {
    padding: 5px 6px;
  }
}

/* ---------- klucz odpowiedzi (details.klucz) ---------- */
.klucz {
  clear: both;
  margin: 30px 0;
}

/* przycisk: błyszczący niebieski, ostre krawędzie, jak nagłówek tabeli */
.klucz > summary {
  display: inline-block;
  list-style: none;
  padding: 8px 24px;
  font-family: var(--sans);
  font-size: 15px;
  font-weight: bold;
  line-height: 1.3;
  hyphens: manual;
  color: #fff;
  background: var(--blue-gloss);
  border: 1px solid var(--blue-edge);
  border-top-color: #8cc4ff;
  cursor: pointer;
  user-select: none;
}

.klucz > summary::-webkit-details-marker {
  display: none;
}

.klucz > summary:hover {
  background: var(--btn-hover);
}

.klucz > summary:active {
  border-top-color: var(--blue-edge);
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, .45);
}

.klucz > summary:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

/* po rozwinięciu przycisk robi się metalowy, jak przyciski nawigacji */
.klucz[open] > summary {
  color: var(--blue);
  background: var(--btn);
  border-color: var(--steel-line);
  border-top-color: #fff;
  border-left-color: #cfd5db;
}

.klucz[open] > summary:hover {
  color: #fff;
  background: var(--btn-hover);
  border-color: var(--blue-edge);
}

/* napis: "Klucz odpowiedzi" / "Ukryj klucz odpowiedzi" */
.klucz .ukryj {
  display: none;
}

.klucz[open] .pokaz {
  display: none;
}

.klucz[open] .ukryj {
  display: inline;
}

/* rozwinięta treść: zielona ramka jak .zz */
.klucz > .odpowiedzi {
  display: flow-root;
  margin-top: 18px;
  padding: 2px 14px 12px;
  hyphens: manual;
  border: 1px solid #04501f;
  border-left: 10px solid #083;
  background: linear-gradient(to bottom,
    #ffffff 0, #ffffff 3px, #f0faf3 3px, #d3ebdb 100%);
}

/* klucza nie drukujemy razem ze sprawdzianem */
@media print {
  .klucz {
    display: none;
  }
}

/* ---------- druk ---------- */
@media print {
  html {
    background: #fff;
  }
  body {
    max-width: none;
    margin: 0;
    background: #fff;
    border: 0;
    outline: 0;
  }
  body > span:first-child,
  p#c {
    display: none;
  }
  a {
    color: var(--ink);
    text-decoration: none;
  }
}