/* Educta — landing page
   Vizuální směr: "Rozvrh jako motiv" (blokový systém týdenní mřížky).
   Jeden soubor, žádné externí závislosti (fonty, CDN). */

:root {
  --bg: #ffffff;
  --soft: #f7f8fa;
  --ink: #14181f;
  --muted: #59606e;
  --line: #eceef2;
  --line-strong: #dde0e7;

  /* jedna akční barva — nese CTA a nic jiného */
  --accent: #4f46e5;
  --accent-hover: #4038c9;
  --accent-soft: #eef0fe;
  --accent-ink: #ffffff;

  /* datové barvy — bloky rozvrhu, nikdy ne dekorace */
  --c1: #4f46e5;
  --c2: #0ea5a5;
  --c3: #f59e0b;
  --c4: #f43f5e;
  --slot: #eef0f4;

  --ok: #0f7a52;
  --err: #b3261e;
  --radius: 12px;
  --wrap: 1120px;

}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1117;
    --soft: #161a22;
    --ink: #e9ecf3;
    --muted: #98a0b0;
    --line: #242a36;
    --line-strong: #2f3644;

    --accent: #7c85ff;
    --accent-hover: #9199ff;
    --accent-soft: #1c2140;
    --accent-ink: #0b0e17;

    --c1: #7c85ff;
    --c2: #2cc5c0;
    --c3: #fbbf24;
    --c4: #fb7185;
    --slot: #1d222c;

    --ok: #4ec99a;
    --err: #ff8a80;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

/* Užší textové sekce drží stejnou levou svislici jako hlavička a hero —
   omezuje se obsah, ne samotný wrap. */
.narrow > * { max-width: 720px; }
.narrow.center > * { margin-left: auto; margin-right: auto; }
.center { text-align: center; }
.muted { color: var(--muted); }

.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;
}

h1, h2, h3 { line-height: 1.15; letter-spacing: -0.025em; margin: 0 0 16px; }
h1 {
  font-size: clamp(1.9rem, 3.3vw, 3.05rem); font-weight: 700;
  text-wrap: balance;   /* ať na posledním řádku nezůstane jedno slovo */
}
h2 { font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 680; margin-bottom: 18px; }
h3 { font-size: 1.08rem; font-weight: 660; letter-spacing: -0.015em; }
p { margin: 0 0 18px; }
a { color: var(--accent); }

/* ---------- značka ---------- */

.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); }
.brand-mark {
  display: grid; flex: 0 0 auto;
  grid-template-columns: 8px 8px; grid-template-rows: 8px 8px; gap: 3px;
}
.brand-mark i { display: block; border-radius: 2.5px; }
.brand-mark i:nth-child(1) { background: var(--c1); }
.brand-mark i:nth-child(2) { background: var(--c2); }
.brand-mark i:nth-child(3) { background: var(--c3); }
.brand-mark i:nth-child(4) { background: var(--c4); }
.brand-name { font-weight: 700; letter-spacing: -0.02em; font-size: 1.16rem; }

/* blokové pravítko nad nadpisy sekcí */
.block-rule {
  display: flex; gap: 4px; margin-bottom: 16px;
}
.block-rule span { width: 12px; height: 5px; border-radius: 2px; }
.block-rule span:nth-child(1) { background: var(--c1); }
.block-rule span:nth-child(2) { background: var(--c2); }
.block-rule span:nth-child(3) { background: var(--c3); }
.block-rule span:nth-child(4) { background: var(--c4); }
.center .block-rule { justify-content: center; }

/* ---------- header ---------- */

.site-header {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}

/* ---------- tlačítka ---------- */

.btn {
  display: inline-block; border: 1px solid transparent; border-radius: 10px;
  padding: 13px 22px; font: inherit; font-weight: 620; line-height: 1.2;
  text-decoration: none; cursor: pointer; white-space: nowrap;
  transition: background-color .15s ease, border-color .15s ease, transform .05s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { background: var(--accent-hover); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line-strong); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-sm { padding: 9px 16px; font-size: 0.94rem; }
.btn-lg { padding: 15px 30px; font-size: 1.05rem; }

/* ---------- hero ---------- */

.hero {
  background: var(--soft);
  border-bottom: 1px solid var(--line);
  padding: clamp(40px, 6vw, 72px) 0 0;
  overflow: hidden;
}
.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
  gap: clamp(28px, 4vw, 52px);
  align-items: center;
  /* Levý sloupec drží stejnou svislici jako hlavička (střed + vnitřní odsazení
     wrapu), pravý utíká k okraji obrazovky. */
  padding-left: max(24px, calc((100vw - var(--wrap)) / 2 + 24px));
  padding-right: 0;
}
.hero .input { background: var(--bg); }

/* screenshot useknutý za pravým okrajem */
.shot-crop {
  overflow: hidden;
  height: clamp(360px, 44vw, 560px);
  background: var(--bg);
  border: 1px solid var(--line); border-right: 0;
  border-radius: 14px 0 0 14px;
  box-shadow: -2px 0 0 color-mix(in srgb, var(--accent) 22%, transparent),
              0 20px 50px rgba(16, 20, 30, .12);
}
@media (prefers-color-scheme: dark) {
  .shot-crop { box-shadow: -2px 0 0 color-mix(in srgb, var(--accent) 30%, transparent),
                           0 20px 50px rgba(0, 0, 0, .45); }
}
.shot-crop img {
  display: block; height: auto; max-width: none;
  /* pevné měřítko, ne procento ze sloupce — jinak se rozvrh na širokém
     monitoru nafoukne a je vidět jen půlka týdne */
  width: clamp(720px, 56vw, 1040px);
  transform: translate(-2%, -4%);
}

.hero-caption {
  display: flex; gap: 9px; align-items: flex-start;
  max-width: var(--wrap); margin: 0 auto;
  padding: 20px 24px clamp(40px, 6vw, 64px);
  font-size: .9rem; color: var(--muted);
}
.hero-caption::before {
  content: ""; flex: 0 0 auto;
  width: 9px; height: 9px; border-radius: 3px; margin-top: .5em;
  background: var(--c3);
}
.eyebrow {
  display: inline-block; margin: 0 0 18px;
  background: var(--accent-soft); color: var(--accent);
  border-radius: 999px; padding: 6px 14px;
  font-size: 0.87rem; font-weight: 620;
}
.lead { font-size: clamp(1.02rem, 1.6vw, 1.15rem); color: var(--muted); max-width: 560px; }
.lead-sm { font-size: 1.06rem; color: var(--muted); }

.signup { margin: 28px 0 24px; }
.signup-form { display: flex; flex-wrap: wrap; gap: 10px; max-width: 560px; }
.input {
  flex: 1 1 150px; min-width: 0;
  padding: 13px 15px; font: inherit;
  color: var(--ink); background: var(--bg);
  border: 1px solid var(--line-strong); border-radius: 10px;
}
.input::placeholder { color: color-mix(in srgb, var(--muted) 80%, transparent); }
.input:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: transparent; }
.input-optional { flex: 1 1 140px; }
.signup-form .btn { flex: 0 0 auto; }
.signup-form input[name="_gotcha"] { position: absolute; left: -9999px; }

.signup-note { margin: 12px 0 0; font-size: 0.9rem; color: var(--muted); }
.signup-success { margin: 12px 0 0; font-weight: 620; color: var(--ok); }
.signup-error { margin: 12px 0 0; color: var(--err); }

.hero-points {
  list-style: none; margin: 0; padding: 0;
  display: flex; flex-wrap: wrap; gap: 8px 22px;
  color: var(--muted); font-size: 0.94rem;
}
.hero-points li { position: relative; padding-left: 18px; }
.hero-points li::before {
  content: ""; position: absolute; left: 0; top: 0.58em;
  width: 9px; height: 9px; border-radius: 3px;
}
.hero-points li:nth-child(1)::before { background: var(--c1); }
.hero-points li:nth-child(2)::before { background: var(--c3); }
.hero-points li:nth-child(3)::before { background: var(--c2); }

/* ---------- screenshot produktu ---------- */

.hero-visual { margin-top: clamp(36px, 5vw, 52px); }

.shot { margin: 0; }
.shot img {
  display: block; width: 100%; height: auto;
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: 0 1px 2px rgba(16, 20, 30, .04), 0 12px 32px rgba(16, 20, 30, .07);
}
@media (prefers-color-scheme: dark) {
  .shot img { box-shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 12px 32px rgba(0, 0, 0, .45); }
}
.shot figcaption {
  display: flex; align-items: flex-start; gap: 9px;
  margin: 14px 0 0; font-size: .9rem; color: var(--muted);
  max-width: 640px;
}
.shot figcaption::before {
  content: ""; flex: 0 0 auto;
  width: 9px; height: 9px; border-radius: 3px; margin-top: .52em;
  background: var(--c3);
}

/* ---------- sekce ---------- */

.section { padding: clamp(52px, 7vw, 80px) 0; }
.section-soft { background: var(--soft); }

.checks, .dashes { list-style: none; margin: 0 0 18px; padding: 0; }
.checks li, .dashes li { position: relative; padding-left: 24px; margin-bottom: 8px; }
.checks li::before, .dashes li::before {
  content: ""; position: absolute; left: 0; top: 0.6em;
  width: 9px; height: 9px; border-radius: 3px;
}
.checks li::before { background: var(--c1); }
.checks li:nth-child(2n)::before { background: var(--c2); }
.dashes li::before { background: var(--slot); border: 1px solid var(--line-strong); }

/* Čtyři karty drží 2×2, aby čtvrtá nezůstávala sama na druhém řádku. */
.cards {
  display: grid; gap: 18px; margin-top: 8px;
  grid-template-columns: 1fr;
}
@media (min-width: 720px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
}
.card {
  background: var(--bg); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 24px;
}
.card::before {
  content: ""; display: block; width: 26px; height: 8px;
  border-radius: 3px; margin-bottom: 16px; background: var(--c1);
}
.card:nth-child(2)::before { background: var(--c2); }
.card:nth-child(3)::before { background: var(--c3); }
.card:nth-child(4)::before { background: var(--c4); }
.card p { margin: 0; color: var(--muted); font-size: 0.96rem; }

.compare {
  display: grid; gap: 16px; margin-top: 24px;
  grid-template-columns: repeat(auto-fit, minmax(258px, 1fr));
}
.compare-col {
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px 24px; background: var(--bg);
}
.compare-col h3 { margin-bottom: 14px; }

/* Pruh bloků nad každým sloupcem: rozsypaný provoz vs. srovnaný. */
.strip { display: flex; gap: 5px; align-items: flex-end; height: 30px; margin-bottom: 18px; }
.strip i { display: block; width: 13px; border-radius: 3px; }
.strip-messy i {
  background: var(--slot); border: 1px solid var(--line-strong);
}
.strip-messy i:nth-child(1) { height: 14px; transform: translateY(-8px); }
.strip-messy i:nth-child(2) { height: 22px; }
.strip-messy i:nth-child(3) { height: 10px; transform: translateY(-14px); }
.strip-messy i:nth-child(4) { height: 18px; transform: translateY(-3px); }
.strip-messy i:nth-child(5) { height: 12px; }
.strip-messy i:nth-child(6) { height: 24px; transform: translateY(-9px); }
.strip-messy i:nth-child(7) { height: 9px; transform: translateY(-5px); }
.strip-messy i:nth-child(8) { height: 16px; transform: translateY(-12px); }
.strip-neat i { height: 20px; }
.strip-neat i:nth-child(4n+1) { background: var(--c1); }
.strip-neat i:nth-child(4n+2) { background: var(--c2); }
.strip-neat i:nth-child(4n+3) { background: var(--c3); }
.strip-neat i:nth-child(4n+4) { background: var(--c4); }
.compare-col ul { list-style: none; margin: 0; padding: 0; color: var(--muted); }
.compare-col li { position: relative; padding-left: 22px; margin-bottom: 8px; }
.compare-col li::before {
  content: ""; position: absolute; left: 0; top: 0.6em;
  width: 9px; height: 9px; border-radius: 3px;
}
.compare-before li::before { background: var(--slot); border: 1px solid var(--line-strong); }
.compare-before h3 { color: var(--muted); }
.compare-after { border-color: color-mix(in srgb, var(--accent) 40%, var(--line)); }
.compare-after h3 { color: var(--accent); }
.compare-after li:nth-child(1)::before { background: var(--c1); }
.compare-after li:nth-child(2)::before { background: var(--c2); }
.compare-after li:nth-child(3)::before { background: var(--c3); }
.compare-after li:nth-child(4)::before { background: var(--c4); }

.faq { border-bottom: 1px solid var(--line); padding: 16px 0; }
.faq summary {
  cursor: pointer; font-weight: 620; list-style: none;
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; color: var(--accent); font-size: 1.3rem; line-height: 1; flex: 0 0 auto;
}
.faq[open] summary::after { content: "\2212"; }
.faq p { margin: 14px 0 4px; color: var(--muted); }

.cta-final { background: var(--soft); border-top: 1px solid var(--line); }

/* ---------- footer ---------- */

.site-footer {
  border-top: 1px solid var(--line);
  padding: 28px 0;
  font-size: 0.92rem;
}
.footer-inner p { margin: 0 0 4px; }

/* ---------- responsive ---------- */

/* Mezi 760 a 1100 px zůstává hero dvousloupcové, jen se stáhne:
   nepovinné pole školy jde pryč a mezera mezi sloupci se zmenší. */
@media (max-width: 1100px) {
  .hero-inner { gap: 24px; }
  .hero .input-optional { display: none; }
  .shot-crop { height: clamp(320px, 46vw, 460px); }
  .shot-crop img { width: clamp(560px, 78vw, 900px); }
}

@media (max-width: 760px) {
  .hero-inner {
    grid-template-columns: 1fr;
    padding-left: 24px; padding-right: 24px;
  }
  .shot-crop {
    height: auto;
    border-right: 1px solid var(--line);
    border-radius: 12px;
  }
  .shot-crop img { width: 100%; transform: none; }
}

@media (max-width: 560px) {
  .signup-form { flex-direction: column; align-items: stretch; }
  /* ve sloupci by se flex-basis choval jako výška — pole byla 190 px vysoká */
  .signup-form .input { flex: 0 0 auto; width: 100%; }
  .signup-form .btn { width: 100%; }
  .hero-points { flex-direction: column; gap: 6px; }
  .shot-crop { border-radius: 10px; }
}

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