/* =========================================================================
   EKW — Kalkulator cyfry kontrolnej księgi wieczystej
   Estetyka: nowoczesne "cassette futurism" / bursztynowy terminal CRT.
   Inspiracja tokenami z NovusGFX/retro-design-system.
   ========================================================================= */

/* ----------------------------- Design tokens ----------------------------- */
:root {
  /* palette — dark (default) */
  --bg:            #100d08;
  --bg-2:          #161109;
  --surface:       #1c160d;
  --surface-2:     #221b10;
  --line:          #3a2f1c;
  --line-soft:     #2a2214;

  --text:          #f6efdf;
  --text-muted:    #b6a988;
  --text-faint:    #7e745c;

  --amber:         #ffb340;
  --amber-bright:  #ffc966;
  --amber-deep:    #c8801c;
  --phosphor:      #56e39f;
  --cyan:          #57d7e6;

  --ok:            #56e39f;
  --ok-bg:         rgba(86, 227, 159, 0.10);
  --err:           #ff6b6b;
  --err-bg:        rgba(255, 107, 107, 0.10);
  --warn:          #ffd166;

  /* effects */
  --glow-amber:    0 0 0 1px rgba(255, 179, 64, 0.30), 0 0 24px -6px rgba(255, 179, 64, 0.55);
  --shadow:        0 18px 50px -24px rgba(0, 0, 0, 0.85);
  --shadow-card:   0 1px 0 rgba(255,255,255,0.03) inset, 0 20px 45px -30px rgba(0,0,0,0.9);
  --radius:        16px;
  --radius-sm:     10px;

  /* type */
  --font-head: "Space Grotesk", system-ui, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", monospace;

  --maxw: 1080px;
}

html[data-theme="light"] {
  --bg:            #f4ede0;
  --bg-2:          #efe6d4;
  --surface:       #fffaf0;
  --surface-2:     #fbf2e2;
  --line:          #e3d4b6;
  --line-soft:     #ece0c8;

  --text:          #241c0e;
  --text-muted:    #6c5d3e;
  --text-faint:    #97875f;

  --amber:         #b9740a;
  --amber-bright:  #d98a13;
  --amber-deep:    #8a560a;
  --phosphor:      #0f8f5b;
  --cyan:          #1597a6;

  --ok:            #0f8f5b;
  --ok-bg:         rgba(15, 143, 91, 0.10);
  --err:           #d23b3b;
  --err-bg:        rgba(210, 59, 59, 0.10);

  --glow-amber:    0 0 0 1px rgba(185, 116, 10, 0.25), 0 0 22px -8px rgba(185, 116, 10, 0.4);
  --shadow:        0 18px 50px -28px rgba(120, 90, 30, 0.5);
  --shadow-card:   0 1px 0 rgba(255,255,255,0.6) inset, 0 18px 40px -30px rgba(120, 90, 30, 0.45);
}

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

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  transition: background 0.4s ease, color 0.4s ease;
}

a { color: inherit; }
img { max-width: 100%; }
code, .mono { font-family: var(--font-mono); }

h1, h2, h3 { font-family: var(--font-head); line-height: 1.1; margin: 0; }

::selection { background: var(--amber); color: #1a1206; }

/* --------------------------- Decorative layers --------------------------- */
.bg-grid, .bg-glow, .scanlines {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}
.bg-grid {
  background-image:
    linear-gradient(to right, var(--line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-soft) 1px, transparent 1px);
  background-size: 46px 46px;
  -webkit-mask-image: radial-gradient(120% 90% at 50% -10%, #000 35%, transparent 78%);
          mask-image: radial-gradient(120% 90% at 50% -10%, #000 35%, transparent 78%);
  opacity: 0.5;
}
.bg-glow {
  background:
    radial-gradient(60% 40% at 12% 0%, rgba(255, 179, 64, 0.16), transparent 60%),
    radial-gradient(50% 45% at 100% 8%, rgba(86, 227, 159, 0.10), transparent 60%);
}
.scanlines {
  background: repeating-linear-gradient(to bottom, rgba(0,0,0,0.05) 0 1px, transparent 1px 3px);
  mix-blend-mode: overlay;
  opacity: 0.6;
}
html[data-theme="light"] .scanlines { opacity: 0.25; }

/* ------------------------------- Layout ---------------------------------- */
.site-header, main, .site-footer { position: relative; z-index: 1; }

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 clamp(16px, 4vw, 32px) 80px;
}

/* ------------------------------- Header ---------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 16px;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px clamp(16px, 4vw, 32px);
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  backdrop-filter: blur(12px) saturate(140%);
  -webkit-backdrop-filter: blur(12px) saturate(140%);
  border-bottom: 1px solid var(--line-soft);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-family: var(--font-head);
  font-weight: 700;
  letter-spacing: 0.02em;
}
.brand-mark { color: var(--amber); letter-spacing: -3px; font-size: 1.1rem; }
.brand-text { font-size: 1.15rem; }
.brand-dot { color: var(--amber); }

.nav {
  display: flex;
  gap: clamp(10px, 2vw, 26px);
  margin-left: auto;
  font-size: 0.92rem;
  font-weight: 500;
}
.nav a {
  text-decoration: none;
  color: var(--text-muted);
  padding: 6px 2px;
  position: relative;
  transition: color 0.18s ease;
}
.nav a::after {
  content: "";
  position: absolute;
  left: 0; right: 100%; bottom: -2px;
  height: 2px;
  background: var(--amber);
  transition: right 0.22s ease;
}
.nav a:hover { color: var(--text); }
.nav a:hover::after { right: 0; }
.nav-ext { color: var(--amber) !important; }

.theme-toggle {
  flex: none;
  width: 40px; height: 40px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--amber);
  font-size: 1.1rem;
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.theme-toggle:hover { transform: rotate(-25deg) scale(1.05); box-shadow: var(--glow-amber); border-color: var(--amber); }

/* -------------------------------- Hero ----------------------------------- */
.hero {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(48px, 9vw, 110px) clamp(16px, 4vw, 32px) clamp(28px, 5vw, 56px);
  position: relative;
  z-index: 1;
}
.hero-inner { max-width: 760px; }
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--phosphor);
  margin: 0 0 22px;
}
.blink { color: var(--phosphor); animation: blink 1.1s steps(2, start) infinite; }
@keyframes blink { to { opacity: 0; } }

.hero-title {
  font-size: clamp(2.6rem, 8vw, 5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 22px;
}
.hero-title .accent {
  color: var(--amber);
  text-shadow: 0 0 32px rgba(255, 179, 64, 0.35);
}
.hero-sub {
  font-size: clamp(1rem, 2.2vw, 1.2rem);
  color: var(--text-muted);
  max-width: 620px;
  margin: 0 0 32px;
}
.hero-sub strong { color: var(--text); font-weight: 600; }

.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 30px; }
.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  list-style: none;
  padding: 0; margin: 0;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-faint);
}
.hero-badges li { display: flex; align-items: center; gap: 8px; }
.hero-badges li::before { content: "▸"; color: var(--amber); }

/* ------------------------------- Buttons --------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 0.98rem;
  text-decoration: none;
  padding: 13px 24px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: linear-gradient(180deg, var(--amber-bright), var(--amber));
  color: #1a1206;
  box-shadow: var(--glow-amber);
}
.btn-primary:hover { box-shadow: 0 0 0 1px var(--amber), 0 0 30px -4px rgba(255,179,64,0.7); }
.btn-ghost {
  background: var(--surface);
  color: var(--text);
  border-color: var(--line);
}
.btn-ghost:hover { border-color: var(--amber); color: var(--amber); }
.btn-small { padding: 9px 16px; font-size: 0.86rem; border-radius: 8px; }
.btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none; }

/* ------------------------------- Panels ---------------------------------- */
.panel {
  background:
    linear-gradient(180deg, var(--surface), var(--surface-2));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(22px, 4vw, 40px);
  margin-top: clamp(24px, 5vw, 48px);
  box-shadow: var(--shadow-card);
  scroll-margin-top: 84px;
}
.panel-head { margin-bottom: 26px; }
.panel-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--amber);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 3px 8px;
  display: inline-block;
  margin-bottom: 12px;
}
.panel-head h2 {
  font-size: clamp(1.6rem, 4vw, 2.3rem);
  letter-spacing: -0.01em;
  margin-bottom: 8px;
}
.panel-desc { color: var(--text-muted); margin: 0; font-size: 0.98rem; }
.panel-desc code, .panel code {
  font-size: 0.86em;
  background: var(--bg-2);
  border: 1px solid var(--line-soft);
  padding: 1px 6px;
  border-radius: 5px;
  color: var(--amber-bright);
}

/* ------------------------- Calculator / validator ------------------------ */
.kw-grid, .val-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(18px, 3vw, 32px);
  align-items: stretch;
}

.field-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 10px;
}
.kw-field { position: relative; display: flex; align-items: center; }
.kw-input {
  width: 100%;
  font-family: var(--font-mono);
  font-size: clamp(1.05rem, 3.2vw, 1.5rem);
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--text);
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 16px 50px 16px 16px;
  outline: none;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}
.kw-input::placeholder { color: var(--text-faint); }
.kw-input:focus { border-color: var(--amber); box-shadow: var(--glow-amber); }
.icon-btn {
  position: absolute;
  right: 8px;
  width: 34px; height: 34px;
  border: none;
  background: transparent;
  color: var(--text-faint);
  font-size: 0.95rem;
  cursor: pointer;
  border-radius: 8px;
  transition: color 0.15s ease, background 0.15s ease;
}
.icon-btn:hover { color: var(--err); background: var(--err-bg); }
.field-hint { font-size: 0.84rem; color: var(--text-faint); margin: 10px 0 0; }
.field-hint strong { color: var(--text-muted); }
.kw-actions { display: flex; gap: 10px; margin-top: 16px; flex-wrap: wrap; }

/* ---- result card ---- */
.result-card {
  height: 100%;
  display: flex;
  flex-direction: column;
  gap: 18px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: clamp(18px, 3vw, 26px);
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}
.result-card[data-state="ok"]    { border-color: color-mix(in srgb, var(--ok) 55%, var(--line)); box-shadow: 0 0 30px -16px var(--ok); }
.result-card[data-state="err"]   { border-color: color-mix(in srgb, var(--err) 55%, var(--line)); box-shadow: 0 0 30px -16px var(--err); }
.result-card[data-state="calc"]  { border-color: color-mix(in srgb, var(--amber) 55%, var(--line)); box-shadow: var(--glow-amber); }

.result-state { display: flex; align-items: center; gap: 14px; }
.result-badge {
  flex: none;
  width: 44px; height: 44px;
  border-radius: 12px;
  display: grid; place-items: center;
  font-size: 1.3rem; font-weight: 700;
  background: var(--surface-2);
  border: 1px solid var(--line);
  color: var(--text-faint);
}
.result-card[data-state="ok"]   .result-badge { background: var(--ok-bg);  color: var(--ok);  border-color: var(--ok); }
.result-card[data-state="err"]  .result-badge { background: var(--err-bg); color: var(--err); border-color: var(--err); }
.result-card[data-state="calc"] .result-badge { background: rgba(255,179,64,0.12); color: var(--amber); border-color: var(--amber); }
.result-label { font-family: var(--font-head); font-weight: 600; font-size: 1.05rem; }

.kw-checkdigit {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
  border-radius: 12px;
  background: linear-gradient(180deg, rgba(255,179,64,0.12), rgba(255,179,64,0.04));
  border: 1px dashed var(--amber-deep);
}
.kw-checkdigit-label { font-family: var(--font-mono); font-size: 0.8rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-muted); }
.kw-checkdigit-value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2.4rem, 9vw, 3.4rem);
  line-height: 1;
  color: var(--amber);
  text-shadow: 0 0 26px rgba(255,179,64,0.5);
}
.kw-formatted { display: flex; flex-direction: column; gap: 6px; }
.kw-formatted-label { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-faint); }
.kw-formatted code {
  font-size: clamp(1rem, 3.6vw, 1.35rem);
  letter-spacing: 0.06em;
  color: var(--text);
  word-break: break-all;
}

/* ---- breakdown table ---- */
.breakdown {
  margin-top: 24px;
  border-top: 1px solid var(--line-soft);
  padding-top: 18px;
}
.breakdown summary {
  cursor: pointer;
  font-family: var(--font-head);
  font-weight: 600;
  color: var(--amber);
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.breakdown summary::-webkit-details-marker { display: none; }
.breakdown summary::before { content: "+"; font-family: var(--font-mono); }
.breakdown[open] summary::before { content: "–"; }
.breakdown-note { color: var(--text-muted); font-size: 0.9rem; margin: 14px 0 16px; }
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.breakdown-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  min-width: 360px;
}
.breakdown-table th, .breakdown-table td {
  text-align: right;
  padding: 8px 12px;
  border-bottom: 1px solid var(--line-soft);
}
.breakdown-table th:first-child, .breakdown-table td:first-child { text-align: left; }
.breakdown-table thead th { color: var(--text-faint); font-weight: 500; text-transform: uppercase; font-size: 0.72rem; letter-spacing: 0.08em; }
.breakdown-table tbody td { color: var(--text); }
.breakdown-table tbody tr:hover td { background: var(--surface-2); }
.breakdown-table tfoot td { font-weight: 700; color: var(--amber); border-bottom: none; padding-top: 12px; }

/* ------------------------------- Chips ----------------------------------- */
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 24px; }
.chip {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--bg-2);
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.16s ease;
}
.chip:hover { border-color: var(--amber); color: var(--text); }
.chip.is-active {
  background: linear-gradient(180deg, var(--amber-bright), var(--amber));
  color: #1a1206;
  border-color: var(--amber);
  box-shadow: var(--glow-amber);
}

/* ---- validator meta ---- */
.val-meta {
  display: grid;
  gap: 10px;
  padding-top: 4px;
}
.val-meta .meta-row {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  font-size: 0.92rem;
  padding: 8px 0;
  border-bottom: 1px solid var(--line-soft);
}
.val-meta .meta-row:last-child { border-bottom: none; }
.val-meta .meta-key { color: var(--text-faint); font-family: var(--font-mono); font-size: 0.8rem; letter-spacing: 0.06em; text-transform: uppercase; }
.val-meta .meta-val { color: var(--text); font-family: var(--font-mono); text-align: right; word-break: break-all; }

/* ------------------------------ Reference -------------------------------- */
.ref-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
}
.ref-card {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 18px;
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}
.ref-card:hover { transform: translateY(-3px); border-color: var(--amber); box-shadow: var(--shadow); }
.ref-card h3 {
  font-size: 1.1rem;
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 8px;
  color: var(--amber);
}
.ref-card h3 span { font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-faint); font-weight: 400; letter-spacing: 0.04em; }
.ref-card p { margin: 0; font-size: 0.9rem; color: var(--text-muted); }

/* ------------------------------- Footer ---------------------------------- */
.site-footer {
  max-width: var(--maxw);
  margin: 60px auto 0;
  padding: 40px clamp(16px, 4vw, 32px) 50px;
  border-top: 1px solid var(--line-soft);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 26px;
}
.footer-brand { max-width: 460px; }
.footer-brand .brand-text { font-family: var(--font-head); font-weight: 700; font-size: 1.2rem; }
.footer-brand p { color: var(--text-muted); font-size: 0.9rem; margin: 10px 0 0; }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a { color: var(--amber); text-decoration: none; font-weight: 500; font-size: 0.92rem; }
.footer-links a:hover { text-decoration: underline; }
.footer-fine { color: var(--text-faint); font-size: 0.8rem; margin: 0; }

/* ----------------------------- Responsive -------------------------------- */
@media (max-width: 720px) {
  .kw-grid, .val-grid { grid-template-columns: 1fr; }
  .nav { display: none; }
  .site-header { gap: 10px; }
  .brand { margin-right: auto; }
}

@media (max-width: 420px) {
  .hero-cta .btn { flex: 1 1 100%; }
  .kw-actions .btn { flex: 1 1 100%; }
}

/* --------------------------- Motion / a11y ------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}
:focus-visible { outline: 2px solid var(--amber); outline-offset: 2px; border-radius: 4px; }