/* Šachovka — základní styly (mobile-first, bez frameworku) */

:root {
  --color-bg: #f7f5f0;
  --color-surface: #ffffff;
  --color-text: #2b2a28;
  --color-muted: #6b6963;
  --color-border: #e4e0d6;
  --color-primary: #2e7d55;
  --color-primary-dark: #235f41;
  --color-primary-contrast: #ffffff;
  --color-accent: #d98c2b;
  --color-danger: #b3413a;
  --radius: 12px;
  --shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font);
  line-height: 1.5;
  /* Zruší ~300ms čekání prohlížeče "je to dvojklik pro zoom?" před kliknutím
     — bez toho na iOS občas nešlo kliknout na odkazy napoprvé. */
  touch-action: manipulation;
}

a { color: var(--color-primary-dark); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3 { line-height: 1.25; margin: 0 0 0.5rem; }

img { max-width: 100%; }

/* --- Layout --- */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  /* env(safe-area-inset-top) = odskok pod notch/Dynamic Island/status bar
     v Capacitor obálce na iOS (na webu bez notche je to 0, neškodí). */
  padding: calc(0.75rem + env(safe-area-inset-top)) 1rem 0.75rem;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  flex-wrap: wrap;
}

.brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-text);
}

.topnav {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  font-size: 0.95rem;
}

.topnav-user {
  color: var(--color-muted);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface);
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  height: 2px;
  margin: 0 6px;
  background: var(--color-text);
  border-radius: 2px;
}

@media (max-width: 720px) {
  .nav-toggle { display: flex; }

  .topnav {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
    order: 3;
  }
  .topnav.is-open { display: flex; }
  .topnav a,
  .topnav .streak-badge,
  .topnav .topnav-user {
    padding: 0.6rem 0.25rem;
    border-top: 1px solid var(--color-border);
  }
  .topnav .streak-badge {
    border-radius: 0;
    background: transparent;
    border-width: 1px 0 0;
  }
}

.streak-badge {
  font-size: 0.85rem;
  font-weight: 600;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 0.25rem 0.65rem;
  white-space: nowrap;
}

.content {
  max-width: 960px;
  margin: 0 auto;
  padding: 1.25rem 1rem 3rem;
}

.footer {
  text-align: center;
  color: var(--color-muted);
  font-size: 0.85rem;
  padding: 2rem 1rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 1.25rem;
  margin-top: 0.5rem;
}
.footer-links a {
  color: var(--color-muted);
}

.legal-page {
  max-width: 42rem;
  margin: 0 auto;
}
.legal-page h2 {
  font-size: 1.1rem;
  margin-top: 1.75rem;
}
.legal-page p, .legal-page li {
  color: var(--color-text);
  line-height: 1.6;
}
.legal-page ul {
  padding-left: 1.25rem;
}
.legal-updated {
  color: var(--color-muted);
  font-size: 0.85rem;
}
.contact-email {
  margin: 1.5rem 0;
}

/* --- Buttons --- */

.btn-primary,
.btn-ghost {
  display: inline-block;
  border-radius: var(--radius);
  padding: 0.6rem 1.1rem;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-primary-contrast);
  border-color: var(--color-primary);
}
.btn-primary:hover { background: var(--color-primary-dark); text-decoration: none; }

.btn-ghost {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-text);
}
.btn-ghost:hover { border-color: var(--color-primary); text-decoration: none; }

/* --- Hero / dashboard --- */

.hero { padding: 1rem 0 1.5rem; }
.hero--narrow { padding-bottom: 0.75rem; }
.hero p { color: var(--color-muted); max-width: 40rem; }

.mode-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .mode-grid { grid-template-columns: repeat(3, 1fr); }
}

.mode-card {
  display: block;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
  color: var(--color-text);
  position: relative;
  transition: transform 0.1s ease, box-shadow 0.1s ease;
}
.mode-card:hover { transform: translateY(-2px); text-decoration: none; box-shadow: 0 6px 18px rgba(0,0,0,0.08); }
.mode-card p { color: var(--color-muted); font-size: 0.9rem; margin: 0; }
.mode-icon { font-size: 1.8rem; }

.mode-card--soon { opacity: 0.6; cursor: default; }
.mode-card--soon:hover { transform: none; box-shadow: var(--shadow); }

.app-promo {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-top: 2.5rem;
  padding: 1.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  flex-wrap: wrap;
}
.app-promo-icon {
  width: 72px;
  height: 72px;
  border-radius: 18px;
  flex-shrink: 0;
}
.app-promo-text h2 { font-size: 1.15rem; margin-bottom: 0.35rem; }
.app-promo-text p { color: var(--color-muted); margin: 0 0 0.75rem; font-size: 0.9rem; }
.store-badges { display: flex; gap: 0.6rem; flex-wrap: wrap; }
.store-badge {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-muted);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 0.4rem 0.75rem;
}

.badge-soon {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: var(--color-accent);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  text-transform: uppercase;
}

/* --- Opening list --- */

.opening-color-group { margin-bottom: 2rem; }

.opening-grid {
  display: grid;
  gap: 0.9rem;
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .opening-grid { grid-template-columns: repeat(2, 1fr); }
}

.opening-card {
  display: block;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1rem 1.1rem;
  color: var(--color-text);
}
.opening-card:hover { text-decoration: none; border-color: var(--color-primary); }
.opening-card h3 { font-size: 1.05rem; display: flex; align-items: center; gap: 0.5rem; }
.opening-card p { margin: 0; color: var(--color-muted); font-size: 0.88rem; }

.eco {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--color-muted);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 0.05rem 0.4rem;
}

.empty-hint { color: var(--color-muted); font-style: italic; }

/* --- Auth forms --- */

.auth-form {
  max-width: 26rem;
  margin: 0 auto;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
}

.auth-form form {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.auth-form label {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-size: 0.9rem;
  color: var(--color-muted);
}

.auth-form input {
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 1rem;
  font-family: inherit;
}

.auth-switch { text-align: center; font-size: 0.9rem; margin-top: 1rem; margin-bottom: 0; }

.form-errors {
  background: #fbeceb;
  color: var(--color-danger);
  border: 1px solid #eecac7;
  border-radius: 8px;
  padding: 0.7rem 1rem;
  margin: 0 0 1rem;
  font-size: 0.9rem;
}

/* --- Trainer --- */

.trainer-header { padding: 0.5rem 0 1rem; }
.trainer-header p { color: var(--color-muted); margin: 0; }

.trainer-layout {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: 1fr;
}

@media (min-width: 800px) {
  .trainer-layout { grid-template-columns: minmax(0, 1fr) 20rem; align-items: start; }
}

.board-wrap {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.chessboard {
  width: 100%;
  max-width: 520px;
  aspect-ratio: 1 / 1;
  margin: 0 auto;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow);
  background: var(--color-surface);
}

.chessboard--mini {
  max-width: 220px;
  margin: 0.75rem auto 0.5rem;
}

.btn-small {
  font-size: 0.85rem;
  padding: 0.4rem 0.8rem;
  width: 100%;
}

.target-board-wrap {
  text-align: center;
}
.target-board-wrap .hint-placeholder {
  margin: 0;
}

.board-error {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  height: 100%;
  padding: 1.5rem;
  text-align: center;
  color: var(--color-danger);
  font-size: 0.95rem;
}
.board-error p:last-child { color: var(--color-muted); font-size: 0.85rem; }

.board-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.control-checkbox {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  color: var(--color-muted);
  cursor: pointer;
}

.difficulty-control {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  max-width: 320px;
  margin: 0 auto;
  width: 100%;
}

.difficulty-control label {
  font-size: 0.85rem;
  color: var(--color-muted);
}

.difficulty-control input[type="range"] {
  width: 100%;
  accent-color: var(--color-primary);
}

.hint-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1rem 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.hint-panel h2 { font-size: 1rem; margin: 0; }

.hint-block { font-size: 0.9rem; }
.hint-placeholder { color: var(--color-muted); margin: 0; }

.hint-block--book .hint-ok { color: var(--color-primary-dark); font-weight: 600; }
.hint-block--book .hint-off-book { color: var(--color-accent); font-weight: 600; }
.hint-focus { color: var(--color-primary-dark); font-weight: 600; margin: 0; }

.hint-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.hint-list li {
  background: var(--color-bg);
  border-radius: 8px;
  padding: 0.5rem 0.65rem;
  font-size: 0.85rem;
}

.hint-engine-status { color: var(--color-muted); font-size: 0.85rem; margin: 0; }
.hint-engine-score { font-weight: 700; }
.hint-engine-score.good { color: var(--color-primary-dark); }
.hint-engine-score.bad { color: var(--color-danger); }

/* Ukazatel načítání stránky — okamžitá zpětná vazba po kliknutí, viz nav.js */
#page-loading-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: var(--color-primary);
  z-index: 9999;
  opacity: 0;
  pointer-events: none;
  transition: width 0s, opacity 0.15s ease;
}
#page-loading-bar.is-loading {
  width: 70%;
  opacity: 1;
  transition: width 8s cubic-bezier(0.1, 0.8, 0.2, 1), opacity 0.15s ease;
}