/* ==========================================================================
   Design systém projektu — jediný zdroj pravdy pro vzhled.
   --------------------------------------------------------------------------
   Načítají ho obě vstupní stránky (front i administrace). Vzniklo sloučením
   front.css a portal.css poté, co administrace přestala používat Bootstrap;
   díky tomu vypadá celá aplikace stejně.

   Obsah:
     1. proměnné (barvy, typografie, rozestupy) + tmavý režim
     2. reset a základní typografie
     3. layout (container, sekce) a tlačítka
     4. hlavička, hero a patička frontu
     5. komponenty administrace (grid, formuláře, karty, tabulky, navbar)

   Pravidlo: nové opakující se prvky patří sem, ne do jednotlivých komponent.
   Ukázky použití jsou v administraci pod Design system.
   ========================================================================== */

:root {
  --color-primary: #2E83FB;
  --color-primary-hover: #1576EC;
  --color-primary-light: #EAF3FF;
  --color-accent: #FCCF0A;
  --color-accent-soft: #FFCB65;
  --text-primary: #111827;
  --text-secondary: #64748B;
  --text-tertiary: #94A3B8;
  --text-inverse: #FFFFFF;
  --text-on-primary: #FFFFFF;
  --text-on-accent: #111827;
  --bg-page: #FFFFFF;
  --bg-surface: #FFFFFF;
  --bg-muted: #F8FAFC;
  --bg-input: rgba(0, 0, 0, 0.05);
  --border-default: #E2E8F0;
  --border-strong: #CBD5E1;
  --color-success: #0DAF04;
  --color-success-bg: rgba(13, 175, 4, 0.1);
  --color-warning: #F57B08;
  --color-warning-bg: rgba(245, 123, 8, 0.1);
  --color-danger: #F54C68;
  --color-danger-bg: rgba(245, 76, 104, 0.1);
  --color-info: #05A8C1;
  --color-info-bg: rgba(5, 168, 193, 0.1);
  --font-base: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
  --fs-xs: 12px;
  --fs-sm: 14px;
  --fs-base: 16px;
  --fs-lg: 18px;
  --fs-xl: 20px;
  --fs-2xl: 24px;
  --fs-3xl: 30px;
  --fs-4xl: 36px;
  --fs-5xl: 48px;
  --lh-base: 1.5;
  --lh-heading: 1.2;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;
  --shadow-card: inset 0 0 0 1px var(--border-default);
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.12);
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 20px;
  --sp-6: 24px;
  --sp-8: 32px;
  --sp-10: 40px;
  --sp-12: 48px;
  --sp-16: 64px;
  --header-height: 60px;
  --banner-height: 36px;
  --content-max-width: 1280px;
  --transition: 150ms ease;
}
[data-theme="dark"] {
  --color-primary-light: rgba(46, 131, 251, 0.15);
  --text-primary: #F1F5F9;
  --text-secondary: #94A3B8;
  --text-tertiary: #64748B;
  --text-inverse: #111827;
  --bg-page: #0F172A;
  --bg-surface: #1E293B;
  --bg-muted: #16213A;
  --bg-input: rgba(255, 255, 255, 0.06);
  --border-default: #334155;
  --border-strong: #475569;
}

/* ---------- Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + var(--banner-height));
}
body {
  font-family: var(--font-base);
  font-size: var(--fs-base);
  line-height: var(--lh-base);
  color: var(--text-primary);
  background: var(--bg-page);
  -webkit-font-smoothing: antialiased;
}
img {
  max-width: 100%;
  display: block;
}
a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover {
  color: var(--color-primary-hover);
}
h1,
h2,
h3,
h4,
h5 {
  line-height: var(--lh-heading);
  color: var(--text-primary);
}
button {
  font-family: inherit;
  cursor: pointer;
}
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ---------- Layout ---------- */
.container {
  /* width: 100% je nutná - jako flex item (viz sticky patička níž) by se jinak
     kontejner scvrkl na šířku obsahu místo na šířku stránky. */
  width: 100%;
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 var(--sp-6);
}
@media (max-width: 720px) {
  .container {
    padding: 0 var(--sp-5);
  }
}
.section {
  padding: var(--sp-16) 0;
  border-bottom: 1px solid var(--border-default);
}
@media (max-width: 720px) {
  .section {
    padding: var(--sp-12) 0;
  }
}
.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto var(--sp-12);
}
.section-head h2 {
  font-size: var(--fs-4xl);
  font-weight: 700;
  margin-bottom: var(--sp-3);
}
@media (max-width: 720px) {
  .section-head h2 {
    font-size: var(--fs-3xl);
  }
}
.section-head p {
  color: var(--text-secondary);
  font-size: var(--fs-lg);
}
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--sp-3);
}
.section-foot {
  text-align: center;
  margin-top: var(--sp-10);
}

/* ---------- Tlačítka ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  height: 40px;
  padding: 0 var(--sp-4);
  font-family: var(--font-base);
  font-size: var(--fs-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), box-shadow var(--transition);
  white-space: nowrap;
}
.btn-lg {
  height: 48px;
  padding: 0 var(--sp-6);
  font-size: var(--fs-base);
}
.btn-primary {
  background: var(--color-primary);
  color: var(--text-on-primary);
}
.btn-primary:hover {
  background: var(--color-primary-hover);
  color: var(--text-on-primary);
}
.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  box-shadow: inset 0 0 0 1px var(--border-strong);
}
.btn-secondary:hover {
  background: var(--bg-muted);
  color: var(--text-primary);
}
/* Tlačítko v hlavičce - dřív inline styl v Latte layoutu, teď regulérní třída. */
.btn-header {
  height: 36px;
  font-size: 13px;
  padding: 0 14px;
}
.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  box-shadow: inset 0 0 0 1px var(--border-default);
}
.btn-ghost:hover {
  background: var(--bg-muted);
  color: var(--text-primary);
}
.btn-accent {
  background: var(--color-accent);
  color: var(--text-on-accent);
}
.btn-accent:hover {
  background: var(--color-accent-soft);
  color: var(--text-on-accent);
}
.btn-outline {
  background: transparent;
  color: var(--text-on-primary);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.4);
}
.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
}
.btn-link {
  background: transparent;
  color: var(--text-primary);
  padding: 0 4px;
  border-bottom: 1px solid var(--text-primary);
  border-radius: 0;
  height: auto;
}

/* ---------- Hlavička ---------- */
.site-header {
  position: sticky;
  top: var(--banner-height);
  z-index: 100;
  height: var(--header-height);
  background: color-mix(in srgb, var(--bg-page) 80%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-default);
}
.site-header .container {
  height: 100%;
  display: flex;
  align-items: center;
  gap: var(--sp-8);
}
.brand {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-weight: 700;
  font-size: var(--fs-base);
  color: var(--text-primary);
  letter-spacing: -0.01em;
}
.brand:hover {
  color: var(--text-primary);
}
.logo-mark {
  width: 28px;
  height: 28px;
  object-fit: contain;
  display: block;
  flex: none;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  margin-left: auto;
}
.main-nav .nav-link {
  display: inline-flex;
  align-items: center;
  height: 36px;
  padding: 0 var(--sp-3);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
}
.main-nav .nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-muted);
}
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: transparent;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  border: none;
}
.theme-toggle:hover {
  background: var(--bg-muted);
  color: var(--text-primary);
}
.theme-toggle svg {
  width: 18px;
  height: 18px;
}
[data-theme="dark"] .icon-moon {
  display: none;
}
:root:not([data-theme="dark"]) .icon-sun {
  display: none;
}
@media (max-width: 860px) {
  .main-nav .nav-link {
    display: none;
  }
}
@media (max-width: 720px) {
  .nav-burger {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    margin-left: auto;
    background: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    border-radius: var(--radius-md);
  }
  .nav-burger svg {
    width: 22px;
    height: 22px;
  }
  .main-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: var(--sp-1);
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-default);
    padding: var(--sp-4) var(--sp-6);
    box-shadow: var(--shadow-lg);
  }
  .main-nav.open {
    display: flex;
  }
  .main-nav.open .nav-link {
    display: inline-flex;
  }
}

/* ---------- Hero (tmavá scéna, split layout) ---------- */
.hero {
  position: relative;
  overflow: hidden;
  background: radial-gradient(900px 500px at 78% 30%, color-mix(in srgb, var(--color-primary) 55%, transparent), transparent 70%), linear-gradient(135deg, #0B1D3A 0%, #0F172A 55%, #102A56 100%);
  color: var(--text-on-primary);
}
.hero h1 {
  font-size: var(--fs-5xl);
  font-weight: 700;
  line-height: 1.1;
  color: var(--text-on-primary);
  margin-bottom: var(--sp-5);
}
.hero-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-10);
  align-items: center;
  min-height: 520px;
  padding: var(--sp-16) 0;
}
/* cert visual */
/* certificate card */
.cert {
  position: relative;
  z-index: 1;
  aspect-ratio: 0.78;
  background: white;
  border: 1px solid #CBD5E1;
  border-radius: 14px;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.15), 0 24px 64px rgba(2, 8, 23, 0.5);
  padding: 32px 30px;
  transform: rotate(1.4deg);
  overflow: hidden;
  color: #111827;
}
.cert::before {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid #E2E8F0;
  border-radius: 8px;
  pointer-events: none;
}
.cert-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 28px;
}
.cert-title {
  font-size: 22px;
  font-weight: 700;
  line-height: 1.1;
}
.cert-title small {
  display: block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: #64748B;
  text-transform: uppercase;
  margin-bottom: 4px;
}
.cert-seal {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: 1.5px solid #2E83FB;
  display: grid;
  place-items: center;
  font-size: 13px;
  font-weight: 700;
  color: #2E83FB;
  position: relative;
}
.cert-seal::after {
  content: "";
  position: absolute;
  inset: 4px;
  border: 1px dashed rgba(46, 131, 251, 0.4);
  border-radius: 50%;
}
.cert-row {
  display: flex;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px dashed #E2E8F0;
  font-size: 13px;
}
.cert-row:last-of-type {
  border-bottom: none;
}
.cert-row .k {
  color: #64748B;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.cert-row .v {
  font-weight: 500;
}
.cert-row .v.ok {
  color: #0DAF04;
  display: inline-flex;
  gap: 6px;
  align-items: center;
}
.cert-row .v.ok::before {
  content: "";
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #0DAF04;
  flex: none;
}
.cert-foot {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid #E2E8F0;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 16px;
}
.cert-sig {
  font-size: 22px;
  font-weight: 700;
  color: #2E83FB;
  border-bottom: 1px solid #E2E8F0;
  padding-bottom: 2px;
}
.cert-no {
  font-family: var(--font-mono);
  font-size: 10px;
  color: #94A3B8;
  letter-spacing: 0.06em;
}
@media (max-width: 900px) {
  .hero-split {
    grid-template-columns: 1fr;
    min-height: 0;
    padding: var(--sp-12) 0;
  }
  .hero h1 {
    font-size: var(--fs-4xl);
  }
  .hero .hero-visual {
    margin-top: var(--sp-6);
    max-width: 380px;
    margin-left: auto;
    margin-right: auto;
  }
}
@media (max-width: 720px) {
  .hero h1 {
    font-size: var(--fs-3xl);
  }
  .hero .hero-lead {
    font-size: var(--fs-base);
  }
}

/* ---------- Patička ---------- */
.site-footer {
  background: var(--bg-muted);
  border-top: 1px solid var(--border-default);
  padding: var(--sp-16) 0 var(--sp-8);
}
@media (max-width: 860px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}
.footer-bottom {
  padding-top: var(--sp-6);
  display: flex;
  justify-content: space-between;
  gap: var(--sp-4);
  flex-wrap: wrap;
  font-size: var(--fs-sm);
  color: var(--text-tertiary);
}

/* ==========================================================================
   Komponenty administrace
   --------------------------------------------------------------------------
   Náhrada Bootstrapu. Stojí na proměnných z první části app.css, takže
   administrace vypadá jako front — jedny barvy, jedna typografie, jeden
   tmavý režim. Názvy tříd zůstaly bootstrapové (.card, .form-control, .row),
   aby se nemusel přepisovat každý JSX; chování je ale jen to, co používáme.
   ========================================================================== */

/* ---------- Grid ---------- */
.row {
  display: flex;
  flex-wrap: wrap;
  margin-left: calc(var(--sp-3) * -1);
  margin-right: calc(var(--sp-3) * -1);
}
.row > * {
  /* Bez flex-basis by se sloupec ve flexu smrskl na obsah a width by neplatila. */
  flex: 0 0 auto;
  padding-left: var(--sp-3);
  padding-right: var(--sp-3);
  width: 100%;
}
.g-2 { gap: var(--sp-2) 0; }
.g-3 { gap: var(--sp-4) 0; }
.g-4 { gap: var(--sp-6) 0; }

.col { flex: 1 0 0%; }
.col-5 { width: 41.6667%; }
.col-6 { width: 50%; }
.col-7 { width: 58.3333%; }

@media (min-width: 768px) {
  .col-md-5 { width: 41.6667%; }
}
@media (min-width: 576px) {
  .col-sm-6 { width: 50%; }
}
@media (min-width: 992px) {
  .col-lg-2 { width: 16.6667%; }
  .col-lg-4 { width: 33.3333%; }
  .col-lg-5 { width: 41.6667%; }
  .col-lg-7 { width: 58.3333%; }
}

/* ---------- Utility ---------- */
.d-flex { display: flex; }
.d-block { display: block; }
.flex-column { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.justify-content-between { justify-content: space-between; }
.justify-content-center { justify-content: center; }
.align-items-center { align-items: center; }
.align-items-end { align-items: flex-end; }
.ms-auto { margin-left: auto; }
.me-auto { margin-right: auto; }
.mt-auto { margin-top: auto; }
.text-center { text-align: center; }
.text-end { text-align: right; }
.text-muted { color: var(--text-secondary); }
.small { font-size: var(--fs-sm); }
.fw-normal { font-weight: 400; }
.fw-semibold { font-weight: 600; }
.w-100 { width: 100%; }
.w-auto { width: auto; }
.h-100 { height: 100%; }
.position-relative { position: relative; }
.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--sp-1); }
.mb-3 { margin-bottom: var(--sp-4); }
.mb-4 { margin-bottom: var(--sp-6); }
.mb-5 { margin-bottom: var(--sp-10); }
.mt-3 { margin-top: var(--sp-4); }
.mt-5 { margin-top: var(--sp-10); }
.me-3 { margin-right: var(--sp-4); }
.py-2 { padding-top: var(--sp-2); padding-bottom: var(--sp-2); }
.py-4 { padding-top: var(--sp-6); padding-bottom: var(--sp-6); }
.py-5 { padding-top: var(--sp-10); padding-bottom: var(--sp-10); }
.pt-3 { padding-top: var(--sp-4); }
.p-4 { padding: var(--sp-6); }
.gap-2 { gap: var(--sp-2); }
.gap-3 { gap: var(--sp-4); }
.border-bottom { border-bottom: 1px solid var(--border-default); }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

/* ---------- Nadpisy ---------- */
.h3 { font-size: var(--fs-3xl); font-weight: 700; }
.h4 { font-size: var(--fs-2xl); font-weight: 700; }
.h5 { font-size: var(--fs-xl); font-weight: 600; }
.h6 { font-size: var(--fs-base); font-weight: 600; }
.lead { font-size: var(--fs-lg); color: var(--text-secondary); }

/* ---------- Karta ---------- */
.card {
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}
.card-body { padding: var(--sp-6); }
.card-title { margin-bottom: var(--sp-4); }
.shadow-sm { box-shadow: var(--shadow-card), var(--shadow-sm); }

/* ---------- Formuláře ---------- */
.form-label {
  display: block;
  margin-bottom: var(--sp-2);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--text-secondary);
}
.form-control,
.form-select {
  display: block;
  width: 100%;
  height: 42px;
  padding: 0 var(--sp-4);
  font-family: inherit;
  font-size: var(--fs-base);
  color: var(--text-primary);
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.form-control:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}
.form-control-sm,
.form-select-sm {
  height: 34px;
  font-size: var(--fs-sm);
  padding: 0 var(--sp-3);
}
.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath fill='none' stroke='%2364748B' stroke-width='2' d='m2 5 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--sp-3) center;
  background-size: 14px;
  padding-right: var(--sp-8);
}
.form-text {
  margin-top: var(--sp-1);
  font-size: var(--fs-xs);
  color: var(--text-tertiary);
}
.form-check {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}
.form-check-input {
  width: 16px;
  height: 16px;
  accent-color: var(--color-primary);
  cursor: pointer;
}
.form-check-label {
  font-size: var(--fs-sm);
  cursor: pointer;
}

/* Chybové stavy. .invalid-feedback je skrytá, dokud pole nemá .is-invalid —
   stejná logika jako v Bootstrapu, na kterou spoléhá React Hook Form. */
.is-invalid {
  border-color: var(--color-danger);
}
.is-invalid:focus {
  box-shadow: 0 0 0 3px var(--color-danger-bg);
}
.invalid-feedback {
  display: none;
  margin-top: var(--sp-1);
  font-size: var(--fs-xs);
  color: var(--color-danger);
}
.is-invalid ~ .invalid-feedback {
  display: block;
}

/* ---------- Hlášky ---------- */
.alert {
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--radius-md);
  font-size: var(--fs-sm);
  margin-bottom: var(--sp-4);
}
.alert-danger { background: var(--color-danger-bg); color: var(--color-danger); }
.alert-success { background: var(--color-success-bg); color: var(--color-success); }
.alert-warning { background: var(--color-warning-bg); color: var(--color-warning); }
.alert-info { background: var(--color-info-bg); color: var(--color-info); }

/* ---------- Odznaky ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px var(--sp-2);
  font-size: var(--fs-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
}
.text-bg-success { background: var(--color-success-bg); color: var(--color-success); }
.text-bg-secondary { background: var(--bg-muted); color: var(--text-secondary); }
.text-bg-primary { background: var(--color-primary-light); color: var(--color-primary); }

/* ---------- Tabulka ---------- */
.table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--fs-sm);
}
.table th,
.table td {
  padding: var(--sp-3) var(--sp-4);
  text-align: left;
  border-bottom: 1px solid var(--border-default);
}
.table th {
  font-weight: 600;
  color: var(--text-secondary);
  white-space: nowrap;
}
.table-light th {
  background: var(--bg-muted);
}
.table tbody tr:last-child td {
  border-bottom: none;
}
.table-hover tbody tr:hover {
  background: var(--bg-muted);
}
.align-middle th,
.align-middle td {
  vertical-align: middle;
}
.table-responsive {
  overflow-x: auto;
}

/* ---------- Tlačítka: doplňky pro administraci ---------- */
.btn-sm {
  height: 34px;
  padding: 0 var(--sp-3);
  font-size: var(--fs-sm);
}
.btn-danger {
  background: var(--color-danger);
  color: var(--text-inverse);
}
.btn-danger:hover {
  background: color-mix(in srgb, var(--color-danger) 85%, black);
  color: var(--text-inverse);
}
.btn-outline-primary {
  background: transparent;
  color: var(--color-primary);
  box-shadow: inset 0 0 0 1px var(--color-primary);
}
.btn-outline-primary:hover {
  background: var(--color-primary-light);
}
.btn-outline-secondary {
  background: transparent;
  color: var(--text-secondary);
  box-shadow: inset 0 0 0 1px var(--border-strong);
}
.btn-outline-secondary:hover:not(:disabled) {
  background: var(--bg-muted);
  color: var(--text-primary);
}
.btn:disabled,
.btn.disabled {
  opacity: 0.55;
  cursor: default;
}
.btn-group {
  display: inline-flex;
}
.btn-group > .btn {
  border-radius: 0;
}
.btn-group > .btn:first-child { border-radius: var(--radius-md) 0 0 var(--radius-md); }
.btn-group > .btn:last-child { border-radius: 0 var(--radius-md) var(--radius-md) 0; }
.btn-group > .btn + .btn { margin-left: -1px; }
.btn-link {
  background: transparent;
  border: none;
  color: inherit;
}

/* ---------- Načítání ---------- */
.spinner-border {
  display: inline-block;
  width: 28px;
  height: 28px;
  border: 3px solid var(--color-primary-light);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spinner-rotate 0.7s linear infinite;
}
@keyframes spinner-rotate {
  to { transform: rotate(360deg); }
}
.text-primary { color: var(--color-primary); }

/* ---------- Navbar administrace ---------- */
.portal-navbar {
  height: var(--header-height);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-default);
  margin-bottom: var(--sp-8);
}
.portal-navbar .container {
  height: 100%;
  display: flex;
  align-items: center;
  gap: var(--sp-6);
}
.portal-navbar .navbar-brand {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-weight: 700;
  font-size: var(--fs-base);
  color: var(--text-primary);
  letter-spacing: -0.01em;
}
.portal-navbar .navbar-brand:hover {
  color: var(--text-primary);
}
.portal-logo {
  width: 28px;
  height: 28px;
  object-fit: contain;
  display: block;
  flex: none;
}
.navbar-nav {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  list-style: none;
}
.navbar-nav .nav-link {
  display: inline-flex;
  align-items: center;
  height: 36px;
  padding: 0 var(--sp-3);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}
.navbar-nav .nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-muted);
}
.navbar-nav .nav-link.active {
  color: var(--text-primary);
  background: var(--bg-muted);
}
.portal-theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: transparent;
  color: var(--text-secondary);
  border: none;
  border-radius: var(--radius-md);
}
.portal-theme-toggle:hover {
  background: var(--bg-muted);
  color: var(--text-primary);
}
.portal-theme-toggle svg {
  width: 18px;
  height: 18px;
}

/* Ikony přepínače: v světlém režimu měsíc, v tmavém slunce. */
.icon-sun,
.portal-icon-sun { display: none; }
[data-theme="dark"] .icon-moon,
[data-theme="dark"] .portal-icon-moon { display: none; }
[data-theme="dark"] .icon-sun,
[data-theme="dark"] .portal-icon-sun { display: inline-block; }

/* ---------- Rozbalovací menu ---------- */
.nav-dropdown {
  position: relative;
}
.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + var(--sp-1));
  left: 0;
  min-width: 220px;
  padding: var(--sp-2);
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  list-style: none;
  z-index: 50;
}
.nav-dropdown-section {
  padding: var(--sp-2) var(--sp-3) var(--sp-1);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}
.nav-dropdown-menu .nav-link {
  width: 100%;
  justify-content: flex-start;
}
.nav-dropdown-toggle::after {
  content: "";
  width: 8px;
  height: 8px;
  margin-left: var(--sp-2);
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translateY(-2px);
}

/* ---------- Stránka: sticky patička ---------- */
/* Krátká stránka nesmí nechat patičku viset uprostřed okna. */
body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
#root {
  display: flex;
  flex-direction: column;
  flex: 1;
}
main {
  flex: 1;
  display: flex;
  flex-direction: column;
}
/* Hero na krátké stránce vyplní zbytek výšky, ať mezi ním a patičkou nezůstane díra. */
main > .hero {
  flex: 1;
}

/* ---------- Design system: dokumentace komponent ---------- */
.design-code {
  margin: 0 0 var(--sp-4);
  padding: var(--sp-4);
  background: var(--bg-muted);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  line-height: 1.6;
  color: var(--text-primary);
  overflow-x: auto;
}
.design-note {
  padding: var(--sp-3) var(--sp-4);
  border-left: 3px solid var(--color-primary);
  background: var(--color-primary-light);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-size: var(--fs-sm);
  color: var(--text-primary);
}
code {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

/* Formuláře nemají být přes celou šířku obrazovky - špatně se čtou. */
.form-row {
  max-width: 520px;
}

/* Překryv nad tabulkou při načítání, aby nepodkládal obsah skokem. */
.datagrid-loading {
  position: absolute;
  inset: 0;
  display: flex;
  justify-content: center;
  padding-top: var(--sp-6);
  background: color-mix(in srgb, var(--bg-surface) 75%, transparent);
  z-index: 1;
}