/* ============================================================
   CUSTOM PROPERTIES
   ============================================================ */
:root {
  --c-dark:          #343e57;
  --c-accent:        #fbcd0c;
  --c-accent-light:  #f8e9ab;
  --c-bg:            #f2f2ee;
  --c-white:         #ffffff;
  --c-muted:         #868ea9;
  --c-border:        #d8d8d4;

  --f-display: 'Red Hat Display', sans-serif;
  --f-text:    'Red Hat Text', sans-serif;

  --s-1: 0.5rem;
  --s-2: 1rem;
  --s-3: 1.5rem;
  --s-4: 2.5rem;
  --s-5: 4rem;
  --s-6: 6rem;

  --radius: 4px;
  --radius-lg: 8px;
  --max-w: 1100px;
}

/* ============================================================
   RESET & BASE
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--f-text);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--c-dark);
  background-color: var(--c-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
}

ul {
  list-style: none;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* ============================================================
   TYPOGRAPHY
   ============================================================ */
h1, h2, h3 {
  font-family: var(--f-display);
  line-height: 1.2;
  color: var(--c-dark);
}

h1 { font-size: clamp(1.6rem, 4vw, 2.4rem); font-weight: 700; }
h2 { font-size: clamp(1.4rem, 3.5vw, 2rem); font-weight: 700; }
h3 { font-size: clamp(1rem, 2.5vw, 1.2rem); font-weight: 500; }

/* ============================================================
   LAYOUT
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding-inline: var(--s-3);
}

section {
  padding-block: var(--s-5);
}

/* ============================================================
   HEADER
   ============================================================ */
.header {
  padding-block: var(--s-2);
  background-color: var(--c-white);
}

.header__logo {
  font-family: var(--f-display);
  font-weight: 700;
  font-size: 1rem;
  text-decoration: none;
  color: var(--c-dark);
}

/* ============================================================
   BUTTON
   ============================================================ */
.btn {
  display: inline-block;
  padding: 0.7rem 1.4rem;
  font-family: var(--f-display);
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: filter 0.15s ease, border-color 0.15s ease;
  white-space: nowrap;
  line-height: 1.4;
  text-align: center;
}

.btn:hover {
  filter: brightness(0.92);
}

.btn--accent {
  background-color: var(--c-accent);
  color: var(--c-dark);
  border-color: var(--c-accent);
}

.btn--outline {
  background-color: transparent;
  color: var(--c-dark);
  border-color: var(--c-dark);
}

.btn--outline:hover {
  background-color: var(--c-dark);
  color: var(--c-white);
  filter: none;
}

/* ============================================================
   LINK ARROW
   ============================================================ */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.3em;
  font-family: var(--f-display);
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--c-dark);
  border-bottom: 2px solid var(--c-accent);
  padding-bottom: 1px;
  transition: border-color 0.15s ease;
}

.link-arrow::after {
  content: '\2192';
}

.link-arrow:hover {
  border-bottom-color: var(--c-dark);
}

/* ============================================================
   QUOTE
   ============================================================ */
.quote {
  border-left: 3px solid var(--c-accent);
  padding-left: var(--s-3);
  margin-top: var(--s-4);
}

.quote p {
  font-size: 1rem;
  line-height: 1.65;
  font-style: italic;
}

.quote cite {
  display: block;
  margin-top: var(--s-1);
  font-style: normal;
  font-family: var(--f-display);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--c-muted);
}

.quote .quote__bridge {
  display: block;
  font-size: 0.8rem;
  font-style: normal;
  color: var(--c-muted);
  margin-top: 0.2rem;
}

/* ============================================================
   LABEL BADGE
   ============================================================ */
.label {
  display: inline-block;
  font-family: var(--f-display);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.25em 0.65em;
  border-radius: var(--radius);
  margin-bottom: var(--s-2);
}

.label--accent {
  background-color: var(--c-accent);
  color: var(--c-dark);
}

/* ============================================================
   NEWSLETTER FORM
   ============================================================ */
.form {
  margin-top: var(--s-3);
}

.form__row {
  display: flex;
  flex-direction: column;
  gap: var(--s-1);
}

.form__input {
  flex: 1;
  padding: 0.7rem 1rem;
  font-family: var(--f-text);
  font-size: 1rem;
  color: var(--c-dark);
  background-color: var(--c-white);
  border: 1.5px solid var(--c-border);
  border-radius: var(--radius);
  outline: none;
  transition: border-color 0.15s ease;
  min-width: 0;
}

.form__input::placeholder {
  color: #aaa;
}

.form__input:focus {
  border-color: var(--c-dark);
}

.form__note {
  margin-top: var(--s-2);
  font-size: 0.85rem;
  color: var(--c-muted);
  max-width: 52ch;
}

.form__consent {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  margin-top: var(--s-2);
  font-size: 0.8rem;
  color: var(--c-muted);
  line-height: 1.5;
  cursor: pointer;
}

.form__consent input[type="checkbox"] {
  margin-top: 0.15rem;
  flex-shrink: 0;
}

.form__consent a {
  color: var(--c-muted);
  text-decoration: underline;
}

.form__consent a:hover {
  color: var(--c-dark);
}

/* ============================================================
   SECTION: HERO
   ============================================================ */
.hero {
  background-color: var(--c-white);
  padding-top: 0;
}

.hero__inner {
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
}

.hero__heading {
  margin-bottom: var(--s-2);
}

.hero__subheading {
  font-size: 1.1rem;
  margin-bottom: var(--s-2);
  max-width: 52ch;
}

.hero__lead {
  font-size: 1rem;
  color: var(--c-muted);
  max-width: 52ch;
  margin-bottom: var(--s-3);
}

.hero__buttons {
  display: flex;
  flex-direction: column;
  gap: var(--s-1);
}

.hero__photo {
  width: 100%;
  max-width: 420px;
  margin-inline: auto;
  order: -1;
}

.hero__photo img {
  width: 100%;
  border-radius: var(--radius-lg);
  aspect-ratio: 4 / 3;
  object-fit: cover;
  object-position: top center;
}

/* ============================================================
   SECTION: METRICS
   ============================================================ */
.metrics {
  background-color: var(--c-white);
  padding-top: 0;
  padding-bottom: var(--s-5);
}

.metrics__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--s-2);
}

.metrics__item {
  background-color: var(--c-bg);
  border-radius: var(--radius-lg);
  padding: var(--s-3);
  text-align: center;
}

.metrics__number {
  display: block;
  font-family: var(--f-display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--c-dark);
  line-height: 1.2;
}

.metrics__label {
  display: block;
  font-size: 0.85rem;
  color: var(--c-muted);
  margin-top: 0.25rem;
}

/* ============================================================
   SECTION: FREE (co zdarma)
   ============================================================ */
.free {
  background-color: var(--c-bg);
}

.free h2 {
  margin-bottom: var(--s-4);
}

.free__newsletter {
  background-color: var(--c-accent-light);
  border-radius: var(--radius-lg);
  padding: var(--s-4) var(--s-3);
  margin-bottom: var(--s-3);
}

.free__newsletter h3 {
  font-size: 1.25rem;
  margin-bottom: var(--s-2);
}

.free__newsletter p {
  max-width: 58ch;
}

.free__items {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-2);
}

.free__item {
  border: 1.5px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: var(--s-3);
  background-color: var(--c-white);
}

.free__item h3 {
  margin-bottom: var(--s-1);
}

.free__item p {
  font-size: 0.95rem;
  color: var(--c-muted);
  margin-bottom: var(--s-2);
}

/* ============================================================
   SECTION: COURSE (Konečně Python)
   ============================================================ */
.course {
  background-color: var(--c-dark);
}

.course h2 {
  color: var(--c-white);
  margin-bottom: var(--s-3);
}

.course__inner {
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
}

.course__text p {
  color: rgba(255, 255, 255, 0.75);
  max-width: 52ch;
  margin-bottom: var(--s-3);
}

.course__note {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
  margin-top: var(--s-2);
}

.course__metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--s-2);
  margin-bottom: var(--s-4);
}

.course__metric {
  background-color: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  padding: var(--s-3);
  text-align: center;
}

.course__metric-number {
  display: block;
  font-family: var(--f-display);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--c-white);
  line-height: 1.3;
}

.course__metric-label {
  display: block;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.5);
  margin-top: 0.25rem;
}

.course__quote {
  border-left-color: var(--c-accent);
  margin-top: 0;
}

.course__quote p {
  color: rgba(255, 255, 255, 0.9);
  font-style: italic;
}

.course__quote cite {
  color: rgba(255, 255, 255, 0.5);
}

.course__quote .quote__bridge {
  color: rgba(255, 255, 255, 0.4);
}

/* ============================================================
   SECTION: ABOUT
   ============================================================ */
.about {
  background-color: var(--c-bg);
}

.about__inner {
  display: flex;
  flex-direction: column;
  gap: var(--s-4);
}

.about__photo {
  width: 100%;
  max-width: 340px;
  margin-inline: auto;
}

.about__photo img {
  width: 100%;
  border-radius: var(--radius-lg);
  aspect-ratio: 3 / 4;
  object-fit: cover;
  object-position: top center;
}

.about__text h2 {
  margin-bottom: var(--s-3);
}

.about__text p {
  max-width: 56ch;
  margin-bottom: var(--s-2);
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background-color: var(--c-dark);
  color: var(--c-white);
  padding-block: var(--s-3);
  text-align: center;
  font-size: 0.75rem;
  margin-top: auto;
}

.footer__name {
  font-family: var(--f-display);
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: var(--s-1);
}

.footer__nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.3rem var(--s-2);
  margin-bottom: var(--s-2);
}

.footer__nav a {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.6);
  text-decoration: underline;
  transition: color 0.15s ease;
}

.footer__nav a:hover {
  color: var(--c-accent);
}

.footer__legal {
  margin-bottom: 0.3rem;
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.4);
  line-height: 1.5;
}

.footer__legal p + p {
  margin-top: 0.3rem;
}

.footer__legal a {
  color: rgba(255, 255, 255, 0.5);
  text-decoration: underline;
}

.footer__legal a:hover {
  color: var(--c-accent);
}

.footer__copy {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.4);
}

/* ============================================================
   PAGE: NEWSLETTER (newsletter.html)
   ============================================================ */
.nl-hero {
  background-color: var(--c-white);
  text-align: center;
  padding-top: var(--s-4);
}

.nl-hero h1 {
  margin-bottom: var(--s-2);
}

.nl-hero p {
  max-width: 56ch;
  margin-inline: auto;
  color: var(--c-muted);
}

.nl-hero .form {
  max-width: 580px;
  margin-inline: auto;
}

.articles {
  background-color: var(--c-bg);
}

.articles h2 {
  margin-bottom: var(--s-4);
}

.article-card {
  background-color: var(--c-white);
  border-radius: var(--radius-lg);
  padding: var(--s-4) var(--s-3);
  margin-bottom: var(--s-3);
}

.article-card h2 {
  font-size: clamp(1.2rem, 3vw, 1.5rem);
  margin-bottom: var(--s-2);
}

.article-card h3 {
  font-size: 1.05rem;
  margin-bottom: var(--s-1);
  margin-top: var(--s-3);
}

.article-card p {
  color: var(--c-muted);
  margin-bottom: var(--s-1);
  line-height: 1.65;
}

.article-card p:last-of-type {
  margin-bottom: var(--s-2);
}

.article-full {
  display: none;
}

.article-full.open {
  display: block;
}

.article-full p {
  margin-bottom: var(--s-2);
}

.article-full strong {
  color: var(--c-dark);
}

.article-full ul,
.article-full ol {
  margin-bottom: var(--s-2);
  padding-left: var(--s-3);
}

.article-full li {
  color: var(--c-muted);
  margin-bottom: var(--s-1);
  line-height: 1.65;
}

.article-full ul li {
  list-style: disc;
}

.article-full ol li {
  list-style: decimal;
}

.article-full h3 {
  font-size: 1.05rem;
  margin-bottom: var(--s-1);
  margin-top: var(--s-3);
}

.expand-btn {
  background: none;
  border: none;
  font-family: var(--f-display);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--c-dark);
  cursor: pointer;
  border-bottom: 2px solid var(--c-accent);
  padding: 0 0 1px;
  transition: border-color 0.15s ease;
}

.expand-btn:hover {
  border-bottom-color: var(--c-dark);
}

.expand-btn::after {
  content: ' \2193';
}

.expand-btn.open::after {
  content: ' \2191';
}

/* ============================================================
   PAGE: SPOLUPRACE-S-AI (spoluprace-s-ai.html)
   ============================================================ */
.hero--workshop .hero__inner {
  align-items: stretch;
}

.workshop-form {
  margin-top: var(--s-3);
  max-width: 520px;
}

.workshop-form .btn {
  margin-top: var(--s-3);
}

.workbook-preview {
  margin: var(--s-4) 0 0;
  text-align: left;
}

.workbook-preview img {
  display: block;
  width: 100%;
  max-width: 480px;
  height: auto;
  border-radius: var(--radius);
  box-shadow: 0 8px 32px rgba(52, 62, 87, 0.12);
}

.workbook-preview__caption {
  margin-top: var(--s-1);
  font-size: 0.85rem;
  color: var(--c-muted);
  font-style: italic;
}

@media (min-width: 1024px) {
  .hero--workshop .hero__inner {
    display: block;
    max-width: 680px;
  }

  .hero--workshop .hero__text {
    padding-top: var(--s-4);
  }
}

/* ============================================================
   PAGE MESSAGE (potvrdte, dekuji, ochrana)
   ============================================================ */
.page-message {
  padding-block: var(--s-5);
}

.page-message__box {
  max-width: 540px;
  margin: 0 auto;
  background-color: var(--c-white);
  border-radius: var(--radius-lg);
  padding: var(--s-4) var(--s-3);
}

.page-message__box--wide {
  max-width: 640px;
}

.page-message__box h1 {
  margin-bottom: var(--s-3);
}

.page-message__box h2 {
  font-size: clamp(1.1rem, 2.5vw, 1.3rem);
  margin-top: var(--s-4);
  margin-bottom: var(--s-2);
}

.page-message__box p {
  margin-bottom: var(--s-2);
  color: var(--c-muted);
}

.page-message__box p strong {
  color: var(--c-dark);
}

.page-message__box a {
  color: var(--c-dark);
  text-decoration: underline;
}

.page-message__box a:hover {
  color: var(--c-accent);
}

.page-message__box ul {
  margin-bottom: var(--s-3);
  padding-left: var(--s-3);
}

.page-message__box li {
  list-style: disc;
  color: var(--c-muted);
  margin-bottom: var(--s-1);
  line-height: 1.65;
}

.page-message__box li strong {
  color: var(--c-dark);
}

.page-message__back {
  margin-top: var(--s-4);
}

.link-arrow-back {
  font-family: var(--f-display);
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--c-dark);
  border-bottom: 2px solid var(--c-accent);
  padding-bottom: 1px;
  transition: border-color 0.15s ease;
}

.link-arrow-back:hover {
  border-bottom-color: var(--c-dark);
}

/* ============================================================
   RESPONSIVE — TABLET (640px+)
   ============================================================ */
@media (min-width: 640px) {
  .hero__buttons {
    flex-direction: row;
  }

  .form__row {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .form__row .form__input {
    flex: 1 1 40%;
    min-width: 140px;
  }

  .form__row .btn {
    flex: 0 0 auto;
  }

  .free__items {
    grid-template-columns: 1fr 1fr;
  }

  .free__newsletter {
    padding: var(--s-4);
  }

  .metrics__grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .course__metrics {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ============================================================
   RESPONSIVE — DESKTOP (1024px+)
   ============================================================ */
@media (min-width: 1024px) {
  section {
    padding-block: var(--s-6);
  }

  .hero {
    padding-top: 0;
  }

  .metrics {
    padding-top: 0;
  }

  .hero__inner {
    display: grid;
    grid-template-columns: 1fr 400px;
    column-gap: var(--s-5);
    row-gap: 0;
    align-items: start;
  }

  .hero__text {
    grid-column: 1;
    grid-row: 1;
    padding-top: var(--s-4);
  }

  .hero__photo {
    grid-column: 2;
    grid-row: 1;
    margin-inline: 0;
    order: 0;
    max-width: none;
  }

  .hero__photo img {
    aspect-ratio: 1 / 1;
  }

  .course__inner {
    flex-direction: row;
    align-items: flex-start;
    gap: var(--s-5);
  }

  .course__quote {
    margin-top: 0;
  }

  .course__text {
    flex: 1;
  }

  .course__quote {
    flex: 0 0 340px;
    margin-top: 4.5rem;
  }

  .about__inner {
    flex-direction: row;
    align-items: flex-start;
    gap: var(--s-5);
  }

  .about__photo {
    flex: 0 0 300px;
    margin-inline: 0;
  }

  .about__text {
    flex: 1;
  }
}