/* ==========================================================================
   ČSSM – Česká společnost pro sexuální medicínu
   Design system v2: serifové titulky (Source Serif 4), tmavě modrá + bílá,
   rytmus sekcí, mobile-first, WCAG AA
   ========================================================================== */

:root {
  /* Barvy */
  --c-primary: #1b3a5f;
  --c-primary-dark: #142c49;
  --c-primary-soft: #eef3f8;
  --c-accent: #4076b4;
  --c-link: #15497f;
  --c-link-hover: #0f3a68;
  --c-text: #1f2933;
  --c-text-muted: #4b5a68;
  --c-border: #d9e2ec;
  --c-bg: #ffffff;
  --c-bg-alt: #f4f7fa;
  --c-footer-bg: #142c49;
  --c-footer-text: #d5dee9;

  /* Typografie */
  --font-sans: "Source Sans 3", -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Source Serif 4", "Iowan Old Style", "Times New Roman", Georgia,
    serif;
  --fs-base: 1.0625rem;      /* 17px */
  --fs-sm: 0.9375rem;        /* 15px */
  --fs-xs: 0.8125rem;        /* 13px */
  --fs-hero: clamp(2.375rem, 1.6rem + 3.2vw, 3.75rem);   /* 38 → 60px */
  --fs-h1: clamp(1.9rem, 1.45rem + 1.8vw, 2.6rem);
  --fs-h2: clamp(1.45rem, 1.2rem + 1vw, 1.8rem);
  --fs-h3: 1.25rem;
  --lh-body: 1.65;
  --lh-heading: 1.2;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --section-pad: clamp(3.25rem, 7vw, 5.5rem);   /* min ~52px mobil, ~88px desktop */

  --radius: 8px;
  --radius-sm: 6px;
  --shadow-sm: 0 1px 2px rgba(20, 44, 73, 0.06), 0 1px 3px rgba(20, 44, 73, 0.1);
  --shadow-md: 0 4px 16px rgba(20, 44, 73, 0.12);
  --container: 72rem;
  --prose-width: 70ch;

  /* Výška hlavičky: logo ~52px + 2×12px padding + 1px border ≈ 76,7px.
     Zaokrouhleno dolů, aby hero (100vh − header) vždy sahalo až po spodní
     hranu viewportu. Používá se v .site-header__inner i v .home-hero. */
  --header-height: 76px;
}

/* --------------------------------------------------------------------------
   Reset a základ
   -------------------------------------------------------------------------- */

*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: var(--lh-body);
  color: var(--c-text);
  background: var(--c-bg);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

main {
  flex: 1;
}

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

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  color: var(--c-primary-dark);
  line-height: var(--lh-heading);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 0.6em;
}

h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }

p {
  margin: 0 0 1em;
}

a {
  color: var(--c-link);
  text-decoration: underline;
  text-decoration-color: var(--c-primary);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  transition: color 0.15s ease, text-decoration-color 0.15s ease;
}

a:hover {
  color: var(--c-link-hover);
  text-decoration-thickness: 2px;
}

:focus-visible {
  outline: 2px solid var(--c-link);
  outline-offset: 2px;
  border-radius: 2px;
}

hr {
  border: 0;
  border-top: 1px solid var(--c-border);
  margin: var(--space-6) 0;
}

ul, ol {
  padding-left: 1.4em;
  margin: 0 0 1em;
}

li {
  margin-bottom: 0.35em;
}

time {
  color: var(--c-text-muted);
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2rem);
}

.section {
  padding-block: var(--section-pad);
}

.section--alt {
  background: var(--c-bg-alt);
  border-block: 1px solid var(--c-border);
}

.prose {
  max-width: var(--prose-width);
}

.prose img {
  margin: var(--space-5) 0;
  border-radius: var(--radius-sm);
}

/* Eyebrow – drobný nadtitulek sekce */

.eyebrow {
  display: block;
  font-family: var(--font-sans);
  font-size: var(--fs-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--c-link);
  margin: 0 0 var(--space-3);
}

/* --------------------------------------------------------------------------
   Hlavička a navigace
   -------------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--c-bg);
  border-bottom: 1px solid var(--c-border);
  transition: box-shadow 0.2s ease;
}

.site-header.is-scrolled {
  box-shadow: 0 2px 12px rgba(20, 44, 73, 0.1);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-block: var(--space-3);
  /* -1px = spodní border na .site-header */
  min-height: calc(var(--header-height) - 1px);
}

.site-header__logo img {
  width: auto;
  max-height: 52px;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: none;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  color: var(--c-primary-dark);
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.nav-toggle:hover {
  background: var(--c-bg-alt);
}

.nav-toggle .icon-close { display: none; }
.nav-toggle[aria-expanded="true"] .icon-menu { display: none; }
.nav-toggle[aria-expanded="true"] .icon-close { display: block; }

.site-nav {
  display: none;
}

.site-nav.is-open {
  display: block;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--c-bg);
  border-bottom: 1px solid var(--c-border);
  box-shadow: var(--shadow-md);
  max-height: calc(100vh - 80px);
  overflow-y: auto;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: var(--space-3) 0;
}

.site-nav a,
.site-nav .nav-group__label {
  display: block;
  padding: var(--space-3) clamp(1rem, 4vw, 2rem);
  font-size: 1rem;
  font-weight: 600;
  color: var(--c-text);
  text-decoration: none;
  transition: color 0.15s ease, background-color 0.15s ease;
}

.site-nav a:hover {
  color: var(--c-primary);
  background: var(--c-bg-alt);
}

.site-nav a[aria-current="page"] {
  color: var(--c-primary);
  box-shadow: inset 3px 0 0 var(--c-primary);
}

.nav-group__label {
  width: 100%;
  border: 0;
  background: none;
  text-align: left;
  font-family: inherit;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.nav-group__label .chevron {
  transition: transform 0.15s ease;
  flex: none;
}

.nav-group[data-open="true"] > .nav-group__label .chevron {
  transform: rotate(180deg);
}

.nav-group__menu {
  display: none;
}

.nav-group[data-open="true"] > .nav-group__menu {
  display: block;
}

.nav-group__menu a {
  font-weight: 400;
  padding-left: calc(clamp(1rem, 4vw, 2rem) + 1rem);
}

.site-nav a.nav-cta {
  margin: var(--space-3) clamp(1rem, 4vw, 2rem) var(--space-2);
  color: #fff;
}

.site-nav a.nav-cta:hover {
  color: #fff;
  background: var(--c-primary-dark);
}

/* Desktopová navigace */
@media (min-width: 900px) {
  .nav-toggle {
    display: none;
  }

  .site-nav,
  .site-nav.is-open {
    display: block;
    position: static;
    background: none;
    border: 0;
    box-shadow: none;
    max-height: none;
    overflow: visible;
  }

  .site-nav > ul {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    padding: 0;
  }

  .nav-group__menu {
    display: none;
  }

  .site-nav a,
  .site-nav .nav-group__label {
    padding: var(--space-2) var(--space-3);
    font-size: var(--fs-sm);
    white-space: nowrap;
    border-radius: var(--radius-sm);
  }

  .site-nav a:hover {
    background: var(--c-bg-alt);
  }

  .site-nav a[aria-current="page"] {
    box-shadow: inset 0 -3px 0 var(--c-primary);
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  }

  .nav-group {
    position: relative;
  }

  .nav-group__menu {
    position: absolute;
    top: calc(100% + 2px);
    left: 0;
    min-width: 14rem;
    background: var(--c-bg);
    border: 1px solid var(--c-border);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
    padding: var(--space-2) 0 !important;
  }

  .nav-group[data-open="true"] > .nav-group__menu {
    display: block;
  }

  .nav-group__menu li {
    margin: 0;
  }

  .nav-group__menu a {
    padding: var(--space-2) var(--space-4);
    font-weight: 400;
    white-space: normal;
  }

  .site-nav a.nav-cta {
    margin: 0 0 0 var(--space-3);
  }
}

/* --------------------------------------------------------------------------
   Tlačítka
   -------------------------------------------------------------------------- */

.btn {
  display: inline-block;
  padding: 0.6rem 1.25rem;
  font-family: var(--font-sans);
  font-size: var(--fs-sm);
  font-weight: 600;
  line-height: 1.4;
  text-align: center;
  text-decoration: none;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.btn--primary {
  background: var(--c-primary);
  color: #fff;
}

.btn--primary:hover {
  background: var(--c-primary-dark);
  color: #fff;
}

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

.btn--outline:hover {
  background: var(--c-primary-soft);
  color: var(--c-primary-dark);
}

/* Světlá varianta pro tmavé panely */
.btn--outline-light {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.55);
}

.btn--outline-light:hover {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  border-color: #fff;
}

/* --------------------------------------------------------------------------
   Záhlaví stránky (titulní pruh)
   -------------------------------------------------------------------------- */

.page-header {
  background: var(--c-bg-alt);
  border-bottom: 1px solid var(--c-border);
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
}

.page-header h1 {
  margin: 0;
  max-width: 28ch;
}

.page-header .page-header__meta {
  margin-top: var(--space-3);
  font-size: var(--fs-sm);
  color: var(--c-text-muted);
}

/* --------------------------------------------------------------------------
   Homepage – hero
   -------------------------------------------------------------------------- */

.home-hero {
  background: var(--c-bg-alt);
  border-bottom: 1px solid var(--c-border);
  padding-block: clamp(3.5rem, 8vw, 6.5rem);
}

.home-hero__grid {
  display: grid;
  gap: clamp(2.5rem, 6vw, 4.5rem);
  align-items: center;
}

@media (min-width: 900px) {
  .home-hero__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(20rem, 1fr);
  }
}

/* Od tabletu nahoru hero vyplní celý viewport pod hlavičkou;
   na mobilu zůstává přirozená výška. */
@media (min-width: 992px) {
  .home-hero {
    display: flex;
    align-items: center;
    min-height: calc(100vh - var(--header-height));
    min-height: calc(100dvh - var(--header-height));
  }

  .home-hero .home-hero__grid {
    flex: 1;
  }
}

.hero-accent {
  display: block;
  width: 3.5rem;
  height: 3px;
  background: var(--c-primary);
  margin-bottom: var(--space-5);
}

.home-hero h1 {
  font-size: var(--fs-hero);
  margin-bottom: var(--space-5);
}

.hero-lead {
  font-size: clamp(1.1rem, 1rem + 0.5vw, 1.3rem);
  line-height: 1.55;
  color: var(--c-text-muted);
  max-width: 56ch;
  margin: 0;
}

/* --------------------------------------------------------------------------
   Countdown – tmavý panel
   -------------------------------------------------------------------------- */

.countdown-card {
  background: var(--c-primary);
  color: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: var(--space-6) var(--space-5);
}

.countdown-card__title {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 600;
  color: #fff;
  line-height: 1.35;
  margin: 0 0 var(--space-5);
}

.countdown-card__timer {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.countdown-card__unit {
  flex: 1;
  text-align: center;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-sm);
  padding: var(--space-4) var(--space-2);
}

.countdown-card__value {
  display: block;
  font-size: clamp(2rem, 1.6rem + 1.2vw, 2.6rem);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: #fff;
  line-height: 1.1;
}

.countdown-card__label {
  display: block;
  margin-top: var(--space-2);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: rgba(255, 255, 255, 0.75);
}

.countdown-card__note {
  font-size: var(--fs-sm);
  color: rgba(255, 255, 255, 0.78);
  margin-bottom: var(--space-5);
}

/* --------------------------------------------------------------------------
   Aktuality – výpis
   -------------------------------------------------------------------------- */

.news-list {
  max-width: var(--prose-width);
}

.news-item {
  padding-block: var(--space-6);
  border-bottom: 1px solid var(--c-border);
}

.news-item:first-child {
  padding-top: 0;
}

.news-item__meta {
  font-size: var(--fs-sm);
  color: var(--c-text-muted);
  margin-bottom: var(--space-2);
}

.news-item__title {
  font-size: 1.4rem;
  margin-bottom: var(--space-2);
}

.news-item__title a {
  color: var(--c-primary-dark);
  text-decoration: none;
}

.news-item__title a:hover {
  color: var(--c-link);
  text-decoration: underline;
}

.news-item__excerpt {
  margin: 0;
  color: var(--c-text-muted);
}

/* Článek */

.article__meta {
  font-size: var(--fs-sm);
  color: var(--c-text-muted);
}

.article__aside-img {
  max-width: 22rem;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  margin-top: var(--space-5);
}

/* --------------------------------------------------------------------------
   Profily osob (Předseda a rada, Kandidáti)
   -------------------------------------------------------------------------- */

.profile {
  padding-block: var(--section-pad);
}

.profile + .profile {
  border-top: 1px solid var(--c-border);
}

.profile:nth-of-type(even) {
  background: var(--c-bg-alt);
}

.profile__grid {
  display: grid;
  gap: var(--space-6);
  align-items: start;
}

@media (min-width: 760px) {
  .profile__grid {
    grid-template-columns: minmax(0, 1.8fr) minmax(14rem, 1fr);
  }
}

.profile__role {
  display: block;
  font-size: var(--fs-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--c-link);
  margin-bottom: var(--space-2);
}

.profile__photo img {
  width: 100%;
  max-width: 20rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
}

@media (min-width: 760px) {
  .profile__photo {
    justify-self: end;
  }
}

.profile__text {
  max-width: var(--prose-width);
}

/* --------------------------------------------------------------------------
   Informační boxy (platby, dokumenty)
   -------------------------------------------------------------------------- */

.info-box {
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-left: 3px solid var(--c-primary);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  padding: var(--space-5) var(--space-6);
  margin-block: var(--space-6);
  max-width: var(--prose-width);
}

.info-box h3 {
  margin-top: 0;
}

.info-box img {
  max-width: 12rem;
  margin: var(--space-4) 0;
}

/* --------------------------------------------------------------------------
   Formulář
   -------------------------------------------------------------------------- */

.form {
  max-width: 42rem;
}

.form__row {
  display: grid;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

@media (min-width: 640px) {
  .form__row--split {
    grid-template-columns: 1fr 1fr;
  }
}

.form__field label {
  display: block;
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--c-primary-dark);
  margin-bottom: var(--space-1);
}

.form__field input[type="text"],
.form__field input[type="tel"],
.form__field input[type="email"],
.form__field input[type="date"] {
  width: 100%;
  padding: 0.55rem 0.75rem;
  font-family: inherit;
  font-size: 1rem;
  color: var(--c-text);
  background: var(--c-bg);
  border: 1px solid #b3c1cf;
  border-radius: var(--radius-sm);
  transition: border-color 0.15s ease;
}

.form__field input:focus {
  outline: 2px solid var(--c-link);
  outline-offset: 1px;
  border-color: var(--c-link);
}

.form__consent {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  font-size: var(--fs-sm);
  margin-block: var(--space-4);
}

.form__consent input {
  width: 1.1rem;
  height: 1.1rem;
  margin-top: 0.2rem;
  accent-color: var(--c-primary);
}

.form__note {
  font-size: var(--fs-sm);
  color: var(--c-text-muted);
}

/* --------------------------------------------------------------------------
   Seznam dokumentů (sympozium)
   -------------------------------------------------------------------------- */

.doc-list {
  list-style: none;
  padding: 0;
  max-width: var(--prose-width);
}

.doc-list li {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-4);
  align-items: baseline;
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--c-border);
  margin: 0;
}

.doc-list__date {
  font-variant-numeric: tabular-nums;
  color: var(--c-text-muted);
  font-size: var(--fs-sm);
  min-width: 9rem;
}

/* --------------------------------------------------------------------------
   Patička
   -------------------------------------------------------------------------- */

.site-footer {
  margin-top: var(--space-8);
  background: var(--c-footer-bg);
  border-top: 3px solid var(--c-accent);
  color: var(--c-footer-text);
  padding-block: var(--space-7) var(--space-6);
}

.site-footer__grid {
  display: grid;
  gap: var(--space-6);
}

@media (min-width: 760px) {
  .site-footer__grid {
    grid-template-columns: 1fr 1fr auto;
    align-items: start;
  }
}

.site-footer__heading {
  font-size: var(--fs-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: #fff;
  margin-bottom: var(--space-3);
}

.site-footer p {
  margin: 0 0 var(--space-1);
}

.site-footer a {
  color: #fff;
  text-decoration-color: rgba(255, 255, 255, 0.5);
}

.site-footer a:hover {
  color: #cfe0f2;
}

.site-footer__essm {
  display: inline-block;
  background: #fff;
  border-radius: var(--radius-sm);
  padding: var(--space-2);
}

.site-footer__essm img {
  width: 90px;
  height: auto;
}

/* --------------------------------------------------------------------------
   Drobnosti
   -------------------------------------------------------------------------- */

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  background: var(--c-primary-dark);
  color: #fff;
  padding: var(--space-2) var(--space-4);
  border-radius: 0 0 var(--radius-sm) 0;
}

.skip-link:focus {
  left: 0;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    transition: none !important;
  }
}