/* =====================================================================
   Numernabis design system · nb-core.css
   Jeden zestaw tokenów i komponentów wspólny dla całej witryny.
   Ładowany jako pierwszy arkusz na każdej stronie.

   Zasady kształtu: przyciski są pigułkami, pola mają 14 px, karty 20 px,
   duże ramy produktu i dialogi 28 px. Jeden akcent (błękit z sygnetu),
   jeden gradient (zorza) używany wyłącznie jako poświata pod produktem.
   ===================================================================== */

:root {
  /* Kolory: biel, chłodna szarość, granatowy atrament z sygnetu, błękit akcentu */
  --nb-white: #ffffff;
  --nb-ink: #0f1633;
  --nb-ink-2: #454c6b;
  --nb-ink-3: #5f6689;
  --nb-ink-4: #666c8b;
  --nb-navy: #101a3d;
  --nb-navy-2: #18244f;
  --nb-dark: #0b1026;
  --nb-dark-2: #151c3a;

  --nb-bg: #f5f5f7;
  --nb-bg-2: #ffffff;
  --nb-surface: #ffffff;
  --nb-surface-2: #f5f5f7;
  --nb-surface-3: #ebebef;
  --nb-line: rgba(15, 22, 51, 0.08);
  --nb-line-2: rgba(15, 22, 51, 0.16);

  --nb-accent: #4557f5;
  --nb-accent-2: #3344de;
  --nb-accent-3: #6b7aff;
  --nb-accent-soft: #eef0ff;
  --nb-accent-soft-2: #dfe3ff;
  --nb-accent-ink: #2a38c9;
  --nb-on-accent: #ffffff;

  --nb-success: #137a4b;
  --nb-success-soft: #e6f6ee;
  --nb-warning: #945b0d;
  --nb-warning-soft: #fdf2df;
  --nb-danger: #c42e39;
  --nb-danger-soft: #fdeaec;

  /* Kolory ilustracyjne (tylko treść tablicy, nigdy chrome UI) */
  --nb-marker: #ff6a3d;
  --nb-chalk: #1ea07f;

  /* Zorza: jedyny gradient w systemie */
  --nb-aurora: linear-gradient(115deg, #4557f5 0%, #2fb7ea 48%, #5fe0bd 100%);
  --nb-aurora-glow:
    radial-gradient(55% 60% at 28% 40%, rgba(69, 87, 245, 0.55), transparent 72%),
    radial-gradient(50% 55% at 74% 58%, rgba(47, 183, 234, 0.5), transparent 72%),
    radial-gradient(45% 45% at 55% 88%, rgba(95, 224, 189, 0.45), transparent 72%);

  /* Typografia: jedna rodzina na całą witrynę */
  --nb-font-display: "Onest", "Segoe UI", system-ui, -apple-system, sans-serif;
  --nb-font-text: "Onest", "Segoe UI", system-ui, -apple-system, sans-serif;
  --nb-font-mono: "Geist Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;

  /* Kształt */
  --nb-r-xs: 8px;
  --nb-r-sm: 10px;
  --nb-r: 14px;
  --nb-r-lg: 20px;
  --nb-r-xl: 28px;
  --nb-r-pill: 999px;

  /* Cienie barwione granatem, jedno źródło światła z góry */
  --nb-shadow-xs: 0 1px 2px rgba(15, 22, 51, 0.05), 0 1px 1px rgba(15, 22, 51, 0.03);
  --nb-shadow-sm: 0 2px 6px rgba(15, 22, 51, 0.06), 0 8px 20px -10px rgba(15, 22, 51, 0.12);
  --nb-shadow: 0 4px 10px rgba(15, 22, 51, 0.05), 0 20px 48px -20px rgba(15, 22, 51, 0.22);
  --nb-shadow-lg: 0 10px 24px -10px rgba(15, 22, 51, 0.1), 0 44px 90px -36px rgba(15, 22, 51, 0.32);
  --nb-shadow-xl: 0 30px 60px -20px rgba(15, 22, 51, 0.22), 0 80px 140px -60px rgba(15, 22, 51, 0.35);
  --nb-ring: 0 0 0 4px rgba(69, 87, 245, 0.18);

  /* Szkło */
  --nb-glass: rgba(255, 255, 255, 0.72);
  --nb-glass-dark: rgba(11, 16, 38, 0.72);
  --nb-glass-blur: saturate(180%) blur(20px);

  /* Ruch */
  --nb-ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  --nb-ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --nb-ease-spring: cubic-bezier(0.34, 1.4, 0.64, 1);
  --nb-fast: 150ms;
  --nb-base: 240ms;
  --nb-slow: 520ms;

  /* Warstwy */
  --nb-z-rail: 20;
  --nb-z-float: 40;
  --nb-z-header: 60;
  --nb-z-popover: 80;
  --nb-z-dialog: 100;
  --nb-z-toast: 120;

  /* Tekstura siatki (motyw tablicy) */
  --nb-grid: radial-gradient(circle at center, rgba(15, 22, 51, 0.14) 1px, transparent 1.4px);

  /* Aliasy dla starszych arkuszy i skryptów */
  --ink: var(--nb-ink);
  --muted: var(--nb-ink-3);
  --line: var(--nb-line);
  --paper: var(--nb-bg);
  --blue: var(--nb-accent);
  --violet: var(--nb-accent);
  --green: var(--nb-accent);
  --coral: var(--nb-accent);
  --numernabis-navy: var(--nb-navy);
  --numernabis-indigo: var(--nb-accent);
  --numernabis-indigo-light: var(--nb-accent-3);
  --nb-indigo: var(--nb-accent);
  --nb-indigo-soft: var(--nb-accent-soft);
  --nb-ink-soft: var(--nb-ink-3);
  --nb-ink-faint: var(--nb-ink-4);
  --nb-line-strong: var(--nb-line-2);
  --nb-surface-sunken: var(--nb-surface-2);
  --nb-radius-sm: var(--nb-r-sm);
  --nb-radius: var(--nb-r-lg);
  --nb-radius-lg: var(--nb-r-xl);
  color-scheme: light;
}

/* ---------- Reset i podstawy ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100dvh;
  background: var(--nb-bg);
  color: var(--nb-ink);
  font-family: var(--nb-font-text);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
img, svg, video, canvas { display: block; max-width: 100%; }
img { height: auto; }
button, input, select, textarea { font: inherit; color: inherit; letter-spacing: inherit; }
button { cursor: pointer; border: 0; background: none; padding: 0; }
a { color: inherit; text-decoration: none; }
p { margin: 0; }
h1, h2, h3, h4 { margin: 0; font-family: var(--nb-font-display); font-weight: 700; line-height: 1.08; letter-spacing: -0.03em; text-wrap: balance; }
h1 { font-size: clamp(2.75rem, 6vw, 5rem); letter-spacing: -0.045em; line-height: 1; }
h2 { font-size: clamp(2rem, 3.8vw, 3.25rem); letter-spacing: -0.04em; line-height: 1.04; }
h3 { font-size: 1.375rem; letter-spacing: -0.02em; font-weight: 600; }
h4 { font-size: 1.0625rem; letter-spacing: -0.01em; font-weight: 600; }
small { font-size: 0.8125rem; }
strong, b { font-weight: 600; }
ul, ol { margin: 0; padding: 0; list-style: none; }
::selection { background: var(--nb-accent-soft-2); color: var(--nb-ink); }
:focus-visible { outline: 2px solid var(--nb-accent); outline-offset: 3px; border-radius: var(--nb-r-xs); }
[hidden] { display: none !important; }

.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; }
.skip-link { position: absolute; left: 12px; top: -56px; z-index: var(--nb-z-toast); padding: 12px 18px; background: var(--nb-ink); color: #fff; border-radius: var(--nb-r-pill); font-weight: 600; transition: top var(--nb-fast) var(--nb-ease); }
.skip-link:focus { top: 12px; }

/* Przejścia między stronami (site-navigation.js) */
html.axio-page-leaving body { opacity: 0.6; transition: opacity 130ms ease; }

/* Strony chronione: treść pojawia się po weryfikacji sesji (auth-guard.js) */
.auth-gate { opacity: 0; transition: opacity var(--nb-base) var(--nb-ease); }
html.auth-ready .auth-gate { opacity: 1; }

/* ---------- Typografia pomocnicza ---------- */
.nb-display { font-family: var(--nb-font-display); font-weight: 700; letter-spacing: -0.04em; line-height: 1.02; }
.nb-lead { font-size: 1.25rem; line-height: 1.5; color: var(--nb-ink-2); max-width: 56ch; text-wrap: pretty; }
.nb-muted { color: var(--nb-ink-3); }
.nb-mono { font-family: var(--nb-font-mono); font-variant-numeric: tabular-nums; }
.nb-num { font-variant-numeric: tabular-nums; }
.nb-label { font-size: 0.8125rem; font-weight: 600; color: var(--nb-ink-3); }
.nb-gradient-text { background: var(--nb-aurora); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* ---------- Przyciski (pigułki) ---------- */
.nb-btn {
  --btn-bg: var(--nb-surface);
  --btn-fg: var(--nb-ink);
  --btn-border: var(--nb-line-2);
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 44px; padding: 0 22px;
  border-radius: var(--nb-r-pill);
  background: var(--btn-bg); color: var(--btn-fg);
  border: 1px solid var(--btn-border);
  font-weight: 600; font-size: 0.9375rem; line-height: 1; letter-spacing: -0.005em; white-space: nowrap;
  transition: background var(--nb-fast) var(--nb-ease), color var(--nb-fast) var(--nb-ease), border-color var(--nb-fast) var(--nb-ease), transform var(--nb-fast) var(--nb-ease), box-shadow var(--nb-fast) var(--nb-ease);
  user-select: none;
}
.nb-btn:hover { --btn-bg: var(--nb-surface-2); }
.nb-btn:active { transform: scale(0.98); }
.nb-btn:disabled, .nb-btn[aria-disabled="true"] { opacity: 0.55; cursor: not-allowed; transform: none; }
.nb-btn svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; flex: none; }

.nb-btn-primary { --btn-bg: var(--nb-accent); --btn-fg: var(--nb-on-accent); --btn-border: transparent; box-shadow: 0 1px 2px rgba(15, 22, 51, 0.15), 0 8px 20px -8px rgba(69, 87, 245, 0.55); }
.nb-btn-primary:hover { --btn-bg: var(--nb-accent-2); box-shadow: 0 1px 2px rgba(15, 22, 51, 0.15), 0 12px 24px -8px rgba(69, 87, 245, 0.6); }
.nb-btn-ink { --btn-bg: var(--nb-ink); --btn-fg: #fff; --btn-border: transparent; }
.nb-btn-ink:hover { --btn-bg: var(--nb-navy-2); }
.nb-btn-white { --btn-bg: #fff; --btn-fg: var(--nb-ink); --btn-border: transparent; }
.nb-btn-white:hover { --btn-bg: #f0f1f6; }
.nb-btn-secondary { --btn-bg: var(--nb-surface); }
.nb-btn-soft { --btn-bg: var(--nb-accent-soft); --btn-fg: var(--nb-accent-ink); --btn-border: transparent; }
.nb-btn-soft:hover { --btn-bg: var(--nb-accent-soft-2); }
.nb-btn-ghost { --btn-bg: transparent; --btn-border: transparent; }
.nb-btn-ghost:hover { --btn-bg: var(--nb-surface-2); }
.nb-btn-danger { --btn-bg: var(--nb-danger); --btn-fg: #fff; --btn-border: transparent; }
.nb-btn-danger:hover { --btn-bg: #b92f39; }
.nb-btn-lg { min-height: 52px; padding: 0 28px; font-size: 1.0625rem; }
.nb-btn-sm { min-height: 34px; padding: 0 14px; font-size: 0.8125rem; }
.nb-btn-block { width: 100%; }
.nb-btn .arrow { display: inline-block; transition: transform var(--nb-fast) var(--nb-ease); }
.nb-btn:hover .arrow { transform: translateX(3px); }

.nb-link { padding: 4px 0; color: var(--nb-accent-ink); font-weight: 600; text-decoration: underline; text-decoration-color: transparent; text-underline-offset: 4px; transition: text-decoration-color var(--nb-fast) var(--nb-ease); }
.nb-link:hover { text-decoration-color: currentColor; }

/* Ikona w przycisku okrągłym */
.nb-icon-btn { display: inline-grid; place-items: center; width: 40px; height: 40px; border-radius: var(--nb-r-pill); border: 1px solid var(--nb-line); background: var(--nb-surface); color: var(--nb-ink-2); transition: background var(--nb-fast) var(--nb-ease), color var(--nb-fast) var(--nb-ease), border-color var(--nb-fast) var(--nb-ease), transform var(--nb-fast) var(--nb-ease); }
.nb-icon-btn:hover { background: var(--nb-surface-2); color: var(--nb-ink); }
.nb-icon-btn:active { transform: scale(0.96); }
.nb-icon-btn svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

/* ---------- Pola formularzy ---------- */
.nb-field { display: grid; gap: 8px; font-size: 0.875rem; font-weight: 600; color: var(--nb-ink-2); }
.nb-field small, .nb-field .hint { font-weight: 400; color: var(--nb-ink-3); }
.nb-input, .nb-field input:not([type="checkbox"]):not([type="radio"]), .nb-field select, .nb-field textarea {
  width: 100%; min-height: 48px; padding: 12px 16px;
  border: 1px solid var(--nb-line-2); border-radius: var(--nb-r);
  background: var(--nb-surface); color: var(--nb-ink);
  font-weight: 400; font-size: 1rem; line-height: 1.4;
  transition: border-color var(--nb-fast) var(--nb-ease), box-shadow var(--nb-fast) var(--nb-ease), background var(--nb-fast) var(--nb-ease);
}
.nb-field textarea { min-height: 128px; resize: vertical; }
.nb-input::placeholder, .nb-field input::placeholder, .nb-field textarea::placeholder { color: var(--nb-ink-4); }
.nb-input:focus, .nb-field input:focus, .nb-field select:focus, .nb-field textarea:focus { outline: none; border-color: var(--nb-accent); box-shadow: var(--nb-ring); }
.nb-field input[readonly] { background: var(--nb-surface-2); color: var(--nb-ink-3); }
.nb-field select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%236b7190' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 14px center; background-size: 16px; padding-right: 42px; }
.nb-check { display: flex; align-items: flex-start; gap: 10px; font-weight: 400; color: var(--nb-ink-2); cursor: pointer; }
.nb-check input { width: 18px; height: 18px; margin: 2px 0 0; accent-color: var(--nb-accent); flex: none; }
.nb-error { color: var(--nb-danger); font-size: 0.875rem; font-weight: 500; }
.nb-error:empty { display: none; }

/* ---------- Karty i powierzchnie ---------- */
.nb-card { background: var(--nb-surface); border: 1px solid var(--nb-line); border-radius: var(--nb-r-lg); }
.nb-panel { background: var(--nb-surface); border-radius: var(--nb-r-xl); box-shadow: var(--nb-shadow); }
.nb-tile { position: relative; overflow: hidden; background: var(--nb-surface); border-radius: var(--nb-r-xl); }
.nb-tile-grey { background: var(--nb-surface-2); }
.nb-tile-dark { background: var(--nb-dark); color: #fff; }
.nb-sunken { background: var(--nb-surface-2); border-radius: var(--nb-r-lg); }
.nb-divider { height: 1px; background: var(--nb-line); border: 0; margin: 0; }
.nb-glass { background: var(--nb-glass); -webkit-backdrop-filter: var(--nb-glass-blur); backdrop-filter: var(--nb-glass-blur); border: 1px solid rgba(255, 255, 255, 0.5); box-shadow: 0 0 0 1px rgba(15, 22, 51, 0.06), var(--nb-shadow-sm); }
.nb-glass-dark { background: var(--nb-glass-dark); -webkit-backdrop-filter: var(--nb-glass-blur); backdrop-filter: var(--nb-glass-blur); border: 1px solid rgba(255, 255, 255, 0.1); color: #fff; }

/* ---------- Odznaki i chipy ---------- */
.nb-chip { display: inline-flex; align-items: center; gap: 6px; min-height: 30px; padding: 0 12px; border-radius: var(--nb-r-pill); background: var(--nb-surface-2); color: var(--nb-ink-2); font-size: 0.8125rem; font-weight: 600; white-space: nowrap; }
.nb-chip-accent { background: var(--nb-accent-soft); color: var(--nb-accent-ink); }
.nb-chip-success { background: var(--nb-success-soft); color: var(--nb-success); }
.nb-chip-warning { background: var(--nb-warning-soft); color: var(--nb-warning); }
.nb-chip-danger { background: var(--nb-danger-soft); color: var(--nb-danger); }
.nb-chip-dark { background: rgba(255, 255, 255, 0.12); color: #fff; }
.nb-tag { display: inline-flex; align-items: center; padding: 3px 9px; border-radius: var(--nb-r-pill); background: var(--nb-surface-2); color: var(--nb-ink-3); font-size: 0.75rem; font-weight: 600; }
.nb-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--nb-success); display: inline-block; }

/* ---------- Awatar ---------- */
.nb-avatar { display: inline-grid; place-items: center; width: 36px; height: 36px; border-radius: 50%; background: var(--nb-accent-soft); color: var(--nb-accent-ink); font-weight: 700; font-size: 0.8125rem; letter-spacing: 0.02em; overflow: hidden; flex: none; }
.nb-avatar img { width: 100%; height: 100%; object-fit: cover; }

/* ---------- Toast ---------- */
.toast, #toast {
  position: fixed; left: 50%; bottom: 24px; z-index: var(--nb-z-toast);
  transform: translate(-50%, 16px); opacity: 0; pointer-events: none;
  padding: 12px 20px; border-radius: var(--nb-r-pill); background: var(--nb-ink); color: #fff;
  font-size: 0.9rem; font-weight: 500; box-shadow: var(--nb-shadow-lg);
  transition: opacity var(--nb-base) var(--nb-ease), transform var(--nb-base) var(--nb-ease-out);
  max-width: min(92vw, 520px); text-align: center;
}
.toast.show, #toast.show { opacity: 1; transform: translate(-50%, 0); pointer-events: auto; }
.toast.success, #toast.success { background: var(--nb-success); }
.toast.error, #toast.error { background: var(--nb-danger); }

/* ---------- Dialogi (numernabis-dialogs.js + statyczne <dialog>) ---------- */
dialog.nb-dialog, dialog.axio-dialog, dialog.profile-dialog, dialog#file-preview-dialog, dialog#learning-calendar-dialog {
  margin: auto; padding: 0; border: 0; border-radius: var(--nb-r-xl);
  background: var(--nb-surface); color: var(--nb-ink); box-shadow: var(--nb-shadow-xl);
  width: min(92vw, 480px); max-height: min(92dvh, 900px); overflow: auto;
  animation: nb-dialog-in var(--nb-base) var(--nb-ease-out);
}
dialog.nb-dialog::backdrop, dialog.axio-dialog::backdrop, dialog.profile-dialog::backdrop, dialog#file-preview-dialog::backdrop, dialog#learning-calendar-dialog::backdrop { background: rgba(11, 16, 38, 0.45); -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px); }
@keyframes nb-dialog-in { from { opacity: 0; transform: translateY(10px) scale(0.97); } to { opacity: 1; transform: none; } }
.nb-dialog form, .axio-dialog form { display: grid; gap: 18px; padding: 28px; }
.nb-dialog header, .axio-dialog header { display: grid; grid-template-columns: auto 1fr auto; gap: 14px; align-items: center; }
.nb-dialog header small, .axio-dialog header small { display: block; font-size: 0.8125rem; font-weight: 500; color: var(--nb-ink-3); margin-bottom: 2px; text-transform: none; letter-spacing: 0; }
.nb-dialog header h2, .axio-dialog header h2, .axio-dialog header h3 { font-size: 1.25rem; letter-spacing: -0.02em; }
.nb-dialog-icon, .dialog-icon { display: grid; place-items: center; width: 42px; height: 42px; border-radius: var(--nb-r); background: var(--nb-accent-soft); color: var(--nb-accent-ink); font-weight: 700; }
.nb-dialog-icon svg, .dialog-icon svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.nb-dialog-icon.is-danger, .dialog-icon.warning { background: var(--nb-danger-soft); color: var(--nb-danger); }
.nb-dialog-icon.is-success { background: var(--nb-success-soft); color: var(--nb-success); }
.nb-dialog-close, .dialog-close { width: 36px; height: 36px; border-radius: 50%; color: var(--nb-ink-3); font-size: 1.4rem; line-height: 1; display: grid; place-items: center; transition: background var(--nb-fast) var(--nb-ease), color var(--nb-fast) var(--nb-ease); }
.nb-dialog-close:hover, .dialog-close:hover { background: var(--nb-surface-2); color: var(--nb-ink); }
.nb-dialog-body p, .axio-dialog > form > p { color: var(--nb-ink-2); line-height: 1.55; }
.nb-dialog-body label, .axio-dialog label { display: grid; gap: 8px; font-size: 0.875rem; font-weight: 600; color: var(--nb-ink-2); }
.nb-dialog-body input, .nb-dialog-body textarea, .axio-dialog input:not([type="checkbox"]):not([type="radio"]), .axio-dialog select, .axio-dialog textarea { width: 100%; min-height: 48px; padding: 12px 16px; border: 1px solid var(--nb-line-2); border-radius: var(--nb-r); background: var(--nb-surface); font-weight: 400; font-size: 1rem; transition: border-color var(--nb-fast) var(--nb-ease), box-shadow var(--nb-fast) var(--nb-ease); }
.nb-dialog-body input:focus, .nb-dialog-body textarea:focus, .axio-dialog input:focus, .axio-dialog select:focus, .axio-dialog textarea:focus { outline: none; border-color: var(--nb-accent); box-shadow: var(--nb-ring); }
.nb-dialog footer, .axio-dialog footer { display: flex; justify-content: flex-end; gap: 10px; flex-wrap: wrap; }
.nb-button, .dialog-primary, .dialog-secondary, .dialog-danger { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; padding: 0 20px; border-radius: var(--nb-r-pill); border: 1px solid var(--nb-line-2); background: var(--nb-surface); font-weight: 600; font-size: 0.9375rem; transition: background var(--nb-fast) var(--nb-ease), transform var(--nb-fast) var(--nb-ease); }
.nb-button:hover, .dialog-secondary:hover { background: var(--nb-surface-2); }
.nb-button:active, .dialog-primary:active, .dialog-secondary:active, .dialog-danger:active { transform: scale(0.98); }
.nb-button-primary, .dialog-primary { background: var(--nb-accent); border-color: transparent; color: #fff; }
.nb-button-primary:hover, .dialog-primary:hover { background: var(--nb-accent-2); }
.nb-button-danger, .dialog-danger { background: var(--nb-danger); border-color: transparent; color: #fff; }
.nb-button-danger:hover, .dialog-danger:hover { background: #b92f39; }
.nb-button-secondary { background: var(--nb-surface); }

/* ---------- Animacje wejścia (script.js dodaje html.js-reveal i .reveal.visible) ----------
   Bez JS albo bez IntersectionObserver treść jest widoczna od razu. */
html.js-reveal .reveal { opacity: 0; transform: translateY(18px); transition: opacity var(--nb-slow) var(--nb-ease-out), transform var(--nb-slow) var(--nb-ease-out); }
html.js-reveal .reveal.visible { opacity: 1; transform: none; }
.reveal-delay-1 { transition-delay: 80ms; }
.reveal-delay-2 { transition-delay: 160ms; }
.reveal-delay-3 { transition-delay: 240ms; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
  html.js-reveal .reveal { opacity: 1; transform: none; }
}

/* ---------- Układ pomocniczy ---------- */
.nb-container { width: min(100% - 48px, 1120px); margin-inline: auto; }
.nb-container-wide { width: min(100% - 48px, 1320px); margin-inline: auto; }
.nb-container-narrow { width: min(100% - 48px, 760px); margin-inline: auto; }
.nb-stack { display: grid; gap: 16px; }
.nb-row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.nb-grid-texture { background-image: var(--nb-grid); background-size: 24px 24px; }
@media (max-width: 640px) { .nb-container, .nb-container-wide, .nb-container-narrow { width: min(100% - 32px, 1120px); } }

/* ---------- Marka ---------- */
.nb-brand { display: inline-flex; align-items: center; gap: 10px; font-family: var(--nb-font-display); font-weight: 700; font-size: 1.2rem; letter-spacing: -0.03em; color: var(--nb-ink); }
.nb-brand img { width: 32px; height: 32px; border-radius: 9px; }
.nb-brand span span, .numernabis-wordmark span { color: var(--nb-accent); }
.numernabis-wordmark { font-family: var(--nb-font-display); font-weight: 700; letter-spacing: -0.03em; }

/* ---------- Skeleton ---------- */
.nb-skeleton { position: relative; overflow: hidden; background: var(--nb-surface-2); border-radius: var(--nb-r-sm); color: transparent; }
.nb-skeleton::after { content: ""; position: absolute; inset: 0; transform: translateX(-100%); background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.7), transparent); animation: nb-shimmer 1.4s infinite; }
@keyframes nb-shimmer { to { transform: translateX(100%); } }

/* ---------- Pusty stan ---------- */
.nb-empty { display: grid; justify-items: center; text-align: center; gap: 8px; padding: 44px 24px; border-radius: var(--nb-r-lg); background: var(--nb-surface-2); color: var(--nb-ink-3); }
.nb-empty strong { color: var(--nb-ink); font-weight: 600; }
.nb-empty .nb-empty-icon { display: grid; place-items: center; width: 52px; height: 52px; border-radius: 16px; background: var(--nb-surface); color: var(--nb-accent-ink); margin-bottom: 6px; box-shadow: var(--nb-shadow-xs); }
.nb-empty .nb-empty-icon svg { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

/* ---------- Kbd ---------- */
kbd { display: inline-block; min-width: 20px; padding: 1px 6px; border-radius: 6px; border: 1px solid var(--nb-line-2); border-bottom-width: 2px; background: var(--nb-surface); font-family: var(--nb-font-mono); font-size: 0.75rem; color: var(--nb-ink-2); text-align: center; }