/* Średnia Kalk — custom tool site
   Direction: graph-paper school tool — navy ink + teal, not purple/dark-glow AI defaults */

:root {
  --ink: #102a43;
  --ink-soft: #243b53;
  --muted: #627d98;
  --paper: #f4f7fa;
  --paper-2: #e8eef4;
  --line: #cdd6e0;
  --accent: #0f766e;
  --accent-2: #0d9488;
  --accent-soft: #ccfbf1;
  --warn: #9a3412;
  --warn-bg: #ffedd5;
  --ok: #14532d;
  --ok-bg: #dcfce7;
  --white: #ffffff;
  --shadow: 0 12px 40px rgba(16, 42, 67, 0.08);
  --radius: 14px;
  --font-display: "Fraunces", Georgia, serif;
  --font-body: "IBM Plex Sans", "Segoe UI", sans-serif;
  --max: 1120px;
  --tool-max: 640px;
  --header-h: 56px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  /* Cleaner first fold (closer to srednia.com fact) — light wash, soft grid only */
  background-color: #eef1f5;
  background-image:
    linear-gradient(180deg, #f7f8fa 0%, #eef1f5 40%, #e8ecf1 100%);
  line-height: 1.55;
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.35;
  background-image:
    linear-gradient(rgba(205, 214, 224, 0.55) 1px, transparent 1px),
    linear-gradient(90deg, rgba(205, 214, 224, 0.55) 1px, transparent 1px);
  background-size: 32px 32px;
  z-index: -1;
}

img {
  max-width: 100%;
}

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

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--ink);
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--ink);
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 100;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

.wrap {
  width: min(var(--max), calc(100% - 2rem));
  margin-inline: auto;
}

.wrap--narrow {
  width: min(var(--tool-max), calc(100% - 2rem));
}

/* Header — slim (competitor has almost none; we keep minimal brand + links) */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(10px);
  background: rgba(247, 248, 250, 0.92);
  border-bottom: 1px solid rgba(205, 214, 224, 0.7);
}

.site-header--slim .header-inner {
  min-height: var(--header-h);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: var(--header-h);
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  text-decoration: none;
  color: var(--ink);
  animation: brand-in 0.55s ease both;
}

.brand-mark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.brand-mark span {
  color: var(--accent);
}

.brand-tag {
  font-size: 0.78rem;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.nav {
  display: flex;
  align-items: center;
  gap: 0.35rem 1.1rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--accent);
}

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: var(--white);
  border-radius: 10px;
  padding: 0.45rem 0.7rem;
  font: inherit;
  color: var(--ink);
  cursor: pointer;
}

/* Hero + tool — tool-first card (srednia.com pattern + our dual calc) */
.hero {
  padding: clamp(1.25rem, 3.5vw, 2.25rem) 0 1rem;
}

.hero--tool-first {
  padding-top: clamp(1.5rem, 4vw, 2.75rem);
}

.hero-grid {
  display: grid;
  gap: 1.25rem;
}

.hero-copy {
  animation: rise 0.65s ease both;
}

.hero-kicker {
  margin: 0 0 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.hero h1,
.tool-panel > h1 {
  margin: 0 0 0.55rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.45rem, 3.2vw, 1.85rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.hero-lead {
  margin: 0;
  max-width: 42rem;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.hero-lead--tight {
  font-size: 0.98rem;
  margin-bottom: 0.75rem;
}

.trust-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
}

.trust-strip li {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--ink-soft);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.35rem 0.55rem;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  padding: 0.65rem 0 0;
  font-size: 0.85rem;
  color: var(--muted);
}

.breadcrumbs a {
  color: var(--muted);
  text-decoration: none;
}

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

.tool-choice-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  margin: 0 0 1rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--line);
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.tool-choice-links a {
  color: #1d4ed8;
  text-decoration: none;
}

.tool-choice-links a:hover {
  text-decoration: underline;
  color: var(--ink);
}

.tool-panel {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 2px);
  box-shadow: 0 8px 28px rgba(16, 42, 67, 0.07);
  padding: clamp(1.1rem, 2.5vw, 1.45rem);
  animation: rise 0.6s ease both;
}

.tool-panel h2 {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
}

.target-box--nested {
  margin-top: 0.75rem;
  border-style: solid;
  padding: 0.85rem;
}

.target-details .target-grid {
  grid-template-columns: 1fr 1fr;
}

.tool-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.85rem;
}

.btn {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--white);
  color: var(--ink);
  font: inherit;
  font-weight: 600;
  font-size: 0.92rem;
  padding: 0.55rem 0.9rem;
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

.btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn:active {
  transform: scale(0.98);
}

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

.btn-primary:hover {
  background: var(--accent-2);
  color: #fff;
}

.btn-ghost {
  background: transparent;
}

.grade-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
}

.grade-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 420px;
}

.grade-table th,
.grade-table td {
  padding: 0.55rem 0.65rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: middle;
}

.grade-table th {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  background: var(--paper-2);
}

.grade-table tr:last-child td {
  border-bottom: 0;
}

.grade-table input {
  width: 100%;
  max-width: 140px;
  font: inherit;
  padding: 0.45rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  color: var(--ink);
}

.grade-table input:focus {
  outline: 2px solid rgba(15, 118, 110, 0.35);
  border-color: var(--accent);
  background: #fff;
}

.row-remove {
  border: 0;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.9rem;
  padding: 0.35rem 0.5rem;
}

.row-remove:hover {
  color: var(--warn);
}

.results {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 1rem;
}

.result-card {
  background: linear-gradient(160deg, var(--accent-soft), #fff 55%);
  border: 1px solid #99f6e4;
  border-radius: 12px;
  padding: 0.9rem 1rem;
}

.result-card.alt {
  background: linear-gradient(160deg, #e0f2fe, #fff 55%);
  border-color: #bae6fd;
}

.result-label {
  margin: 0;
  font-size: 0.82rem;
  color: var(--muted);
  font-weight: 600;
}

.result-value {
  margin: 0.15rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}

.result-meta {
  margin: 0.35rem 0 0;
  font-size: 0.82rem;
  color: var(--ink-soft);
}

.target-box {
  margin-top: 1rem;
  padding: 1rem;
  border-radius: 12px;
  border: 1px dashed var(--line);
  background: var(--paper);
}

.target-box h3 {
  margin: 0 0 0.65rem;
  font-size: 1rem;
  font-family: var(--font-display);
}

.target-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.65rem;
  align-items: end;
}

.field label {
  display: block;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 0.3rem;
}

.field input {
  width: 100%;
  font: inherit;
  padding: 0.5rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.target-out {
  margin: 0.75rem 0 0;
  padding: 0.75rem 0.9rem;
  border-radius: 10px;
  background: var(--ok-bg);
  color: var(--ok);
  font-weight: 600;
  display: none;
}

.target-out.is-visible {
  display: block;
}

.target-out.is-warn {
  background: var(--warn-bg);
  color: var(--warn);
}

.map-details {
  margin-top: 1rem;
}

.map-details summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--ink-soft);
}

.map-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
  gap: 0.45rem;
  margin-top: 0.75rem;
}

.map-grid label {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--muted);
}

.map-grid input {
  width: 100%;
  padding: 0.35rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  font: inherit;
}

/* Content */
.content {
  padding: 1.5rem 0 3.5rem;
}

.content > .wrap {
  max-width: 760px;
}

.content-block {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(1.2rem, 2.5vw, 1.75rem);
  margin-bottom: 1.1rem;
  box-shadow: 0 4px 18px rgba(16, 42, 67, 0.04);
  animation: rise 0.6s ease both;
}

.content-block h2 {
  margin: 0 0 0.7rem;
  font-family: var(--font-display);
  font-size: clamp(1.28rem, 2.5vw, 1.58rem);
  letter-spacing: -0.02em;
  color: var(--ink);
}

.content-block h3 {
  margin: 1.15rem 0 0.45rem;
  font-size: 1.05rem;
  color: var(--ink);
}

.content-block p {
  margin: 0 0 0.8rem;
  color: var(--ink-soft);
  font-size: 1.02rem;
  line-height: 1.65;
}

.content-block p:last-child {
  margin-bottom: 0;
}

.content-block ol,
.content-block ul {
  margin: 0.35rem 0 0.85rem;
  padding-left: 1.25rem;
  color: var(--ink-soft);
  font-size: 1.02rem;
  line-height: 1.6;
}

.content-block li + li {
  margin-top: 0.4rem;
}

.example-table {
  width: 100%;
  border-collapse: collapse;
  margin: 0.85rem 0;
  font-size: 0.95rem;
}

.example-table th,
.example-table td {
  border: 1px solid var(--line);
  padding: 0.5rem 0.65rem;
  text-align: left;
  vertical-align: top;
}

.example-table th {
  background: var(--paper-2);
  font-weight: 600;
  color: var(--ink);
}

.compare-table th:first-child,
.compare-table td:first-child {
  font-weight: 600;
  color: var(--ink);
  width: 28%;
}

.faq details {
  border-top: 1px solid var(--line);
  padding: 0.85rem 0;
}

.faq details:first-of-type {
  border-top: 0;
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--ink);
}

.faq details p {
  margin: 0.5rem 0 0;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 0.85rem;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--ink);
  color: #d9e2ec;
  padding: 2rem 0 2.5rem;
}

.footer-inner {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: 1.4fr 1fr 1fr;
}

.site-footer a {
  color: #9fb3c8;
  text-decoration: none;
}

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

.footer-brand {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: #fff;
  margin: 0 0 0.4rem;
}

.footer-note,
.footer-col p {
  margin: 0;
  font-size: 0.9rem;
  color: #829ab1;
}

.footer-col h3 {
  margin: 0 0 0.5rem;
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #bcccdc;
}

.footer-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-col li + li {
  margin-top: 0.35rem;
}

.footer-bottom {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.82rem;
  color: #829ab1;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes brand-in {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 820px) {
  .nav-toggle {
    display: inline-flex;
  }

  .nav {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    padding-bottom: 0.85rem;
  }

  .nav.is-open {
    display: flex;
  }

  .results,
  .target-grid,
  .target-details .target-grid,
  .footer-inner {
    grid-template-columns: 1fr;
  }
}

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