/* ============================================================
   SQL Практика — лендинг
   Два регистра: «бумага» — то, что объясняют человеку;
   «графит» — то, что делает машина. Знак страницы — полоса
   прогона: один штрих на вариант данных, как в приложении.
   ============================================================ */

:root {
  --paper:      #edf0f4;
  --paper-hi:   #ffffff;
  --paper-2:    #e3e8ee;
  --ink:        #10151b;
  --ink-2:      #4b5665;
  --ink-3:      #78838f;
  --line:       #d5dbe3;
  --line-hi:    #c2cad5;

  --graphite:   #12151a;
  --graphite-2: #1a1e25;
  --graphite-3: #21262e;
  --g-line:     #2a3038;
  --chalk:      #e6e9ee;
  --chalk-2:    #98a2b0;

  --blue:       #1f5fe0;
  --blue-lt:    #4d8dff;
  --blue-wash:  #e6eeff;
  --red:        #d93a4c;
  --red-lt:     #ff6b7a;
  --green:      #0f9c68;
  --amber:      #c07a10;

  --serif: "Bitter", "Charter", "Georgia", serif;
  --sans:  "Golos Text", "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono:  "JetBrains Mono", "SF Mono", ui-monospace, "Cascadia Mono", monospace;

  --wrap: 1140px;
  --r: 10px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 84px; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 17px/1.62 var(--sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; height: auto; display: block; }

a { color: inherit; }

::selection { background: #cadcff; color: var(--ink); }

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

.skip {
  position: absolute; left: -9999px; top: 0;
  background: var(--ink); color: #fff; padding: 10px 16px; z-index: 99;
}
.skip:focus { left: 8px; top: 8px; }

:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
  border-radius: 3px;
}

/* --- типографика ------------------------------------------------ */

.kicker {
  font: 500 11.5px/1 var(--mono);
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 18px;
}
.band-dark .kicker { color: var(--chalk-2); }

.h1 {
  font: 700 clamp(40px, 6.4vw, 76px)/0.98 var(--serif);
  letter-spacing: -.025em;
  margin: 0 0 24px;
}
.h1 em { font-style: normal; color: var(--blue); }

.h2 {
  font: 700 clamp(28px, 3.6vw, 42px)/1.08 var(--serif);
  letter-spacing: -.02em;
  margin: 0 0 18px;
  max-width: 22ch;
}

.h3 {
  font: 600 19px/1.3 var(--sans);
  letter-spacing: -.01em;
  margin: 0 0 8px;
}

.lead {
  font-size: 19px;
  line-height: 1.6;
  color: var(--ink-2);
  max-width: 62ch;
  margin: 0 0 32px;
}
.band-dark .lead { color: var(--chalk-2); }

.note { color: var(--ink-2); max-width: 68ch; }
.band-dark .note { color: var(--chalk-2); }

code {
  font: 500 .89em/1.4 var(--mono);
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: .1em .34em;
}
.band-dark code { background: var(--graphite-3); border-color: var(--g-line); color: var(--chalk); }

/* --- полоса прогона: знак страницы ------------------------------ */

.runs { margin: 0; }

.runs-bar {
  display: flex;
  gap: 3px;
  align-items: stretch;
  height: 34px;
}
.runs-bar i {
  flex: 1 1 0;
  min-width: 2px;
  border-radius: 2px;
  background: var(--green);
  transform: scaleY(0);
  transform-origin: bottom;
  animation: run-in .34s cubic-bezier(.2,.85,.3,1) both;
  animation-delay: calc(var(--i) * 22ms);
}
.runs-bar i.miss { background: var(--red-lt); }

.runs-tall .runs-bar { height: 58px; }

.runs-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  margin-top: 12px;
  font: 500 12.5px/1 var(--mono);
  color: var(--chalk-2);
}
.runs-legend b { color: var(--chalk); font-weight: 600; }
.runs-legend .miss-txt { color: var(--red-lt); }

@keyframes run-in { from { transform: scaleY(0); } to { transform: scaleY(1); } }

/* --- шапка -------------------------------------------------------- */

.top {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgb(237 240 244 / .88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.top-in {
  display: flex;
  align-items: center;
  gap: 28px;
  height: 66px;
}
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; margin-right: auto; }
.brand svg { flex: none; }
.brand-name { display: block; white-space: nowrap; font: 700 16px/1 var(--serif); letter-spacing: -.01em; }
.brand-sub { display: block; white-space: nowrap; font: 500 10.5px/1 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); margin-top: 5px; }

.top-nav { display: flex; gap: 22px; }
.top-nav a { white-space: nowrap; }
.top-nav a {
  font-size: 14.5px;
  text-decoration: none;
  color: var(--ink-2);
  padding: 4px 0;
  border-bottom: 1px solid transparent;
}
.top-nav a:hover { color: var(--ink); border-bottom-color: var(--blue); }

.top-links { display: flex; gap: 10px; }

/* --- кнопки ------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font: 500 14.5px/1 var(--sans);
  text-decoration: none;
  padding: 11px 18px;
  border-radius: 8px;
  border: 1px solid var(--line-hi);
  background: var(--paper-hi);
  color: var(--ink);
  transition: transform .12s ease, background .12s ease, border-color .12s ease;
}
.btn:hover { transform: translateY(-1px); border-color: var(--ink-3); }
.btn svg { flex: none; }

.btn-primary { background: var(--ink); border-color: var(--ink); color: #fff; }
.btn-primary:hover { background: #000; border-color: #000; }

.btn-lg { font-size: 16px; padding: 15px 24px; border-radius: 9px; }

.band-dark .btn { background: var(--graphite-3); border-color: var(--g-line); color: var(--chalk); }
.band-dark .btn:hover { border-color: var(--chalk-2); }
.band-dark .btn-primary { background: var(--blue-lt); border-color: var(--blue-lt); color: #0b1220; }
.band-dark .btn-primary:hover { background: #6ea2ff; border-color: #6ea2ff; }

/* --- полосы-секции ------------------------------------------------ */

.band { padding: 96px 0; }
.band-tight { padding: 72px 0; }
.band-dark { background: var(--graphite); color: var(--chalk); }
.band-paper { background: var(--paper-hi); }
.band-line { border-top: 1px solid var(--line); }

/* --- герой -------------------------------------------------------- */

.hero { padding: 88px 0 84px; }
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  gap: 64px;
  align-items: start;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }

.hero-meta {
  margin-top: 34px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 26px;
  font: 500 12.5px/1.5 var(--mono);
  color: var(--ink-3);
}

.rig {
  background: var(--graphite);
  color: var(--chalk);
  border-radius: 14px;
  padding: 26px 26px 28px;
  box-shadow: 0 26px 60px -30px rgb(16 21 27 / .55);
}
.rig-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 18px;
  font: 500 11.5px/1 var(--mono);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--chalk-2);
}
.rig-ok { color: var(--green); letter-spacing: .06em; }
.rig-rows { margin-top: 26px; border-top: 1px solid var(--g-line); }
.rig-row {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px solid var(--g-line);
  font: 500 13px/1.3 var(--mono);
  color: var(--chalk-2);
}
.rig-row b { color: var(--chalk); font-weight: 600; }
.rig-foot { margin: 20px 0 0; font-size: 14.5px; line-height: 1.55; color: var(--chalk-2); }

/* --- части системы ------------------------------------------------ */

.parts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.part {
  background: var(--paper-hi);
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 26px 24px 24px;
  display: flex;
  flex-direction: column;
}
.part-tag {
  font: 500 11px/1 var(--mono);
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 16px;
}
.part p { margin: 0 0 18px; color: var(--ink-2); font-size: 15.5px; }
.part-where {
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font: 500 12px/1.3 var(--mono);
  color: var(--ink-3);
}

/* --- шаги --------------------------------------------------------- */

.steps { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0; margin-top: 12px; }
.step {
  padding: 26px 24px 24px 0;
  border-top: 2px solid var(--ink);
  margin-right: 24px;
}
.step:last-child { margin-right: 0; }
.step-n {
  min-height: 12px;
  white-space: nowrap;
  font: 500 11.5px/1 var(--mono);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 14px;
}
.step p { margin: 0 0 18px; font-size: 15.5px; color: var(--ink-2); }
.step-out {
  font: 500 12px/1.5 var(--mono);
  color: var(--blue);
}
.step-hand {
  margin-top: 40px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  display: flex;
  gap: 16px;
  align-items: baseline;
  color: var(--ink-2);
  font-size: 15.5px;
}
.step-hand-k {
  flex: none;
  font: 500 11px/1.6 var(--mono);
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--blue);
}

/* --- детерминизм (тёмная полоса) ---------------------------------- */

.det-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 56px;
  align-items: start;
}
.det-list { list-style: none; margin: 0; padding: 0; }
.det-list li { padding: 20px 0; border-top: 1px solid var(--g-line); min-width: 0; }
.det-list li:first-child { border-top: 0; padding-top: 0; }
.det-k {
  display: block;
  font: 500 11.5px/1 var(--mono);
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--blue-lt);
  margin-bottom: 9px;
}
.det-list p { margin: 0; color: var(--chalk-2); font-size: 15.5px; }
.det-list b { color: var(--chalk); font-weight: 600; }

.slab {
  max-width: 100%;
  background: var(--graphite-2);
  border: 1px solid var(--g-line);
  border-radius: var(--r);
  padding: 22px 24px;
  font: 500 13px/1.85 var(--mono);
  color: var(--chalk-2);
  white-space: pre;
  overflow-x: auto;
}
.slab b { color: var(--chalk); font-weight: 600; }
.slab .c { color: var(--ink-3); }

.fail-card {
  margin-top: 24px;
  background: var(--graphite-2);
  border: 1px solid var(--g-line);
  border-radius: var(--r);
  padding: 22px 24px 24px;
}
.fail-card .kicker { margin-bottom: 14px; }

/* --- скриншоты ---------------------------------------------------- */

.shots { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 26px; }
.shot-wide { grid-column: 1 / -1; }

.shot { margin: 0; }
.shot a {
  display: block;
  border: 1px solid var(--g-line);
  border-radius: var(--r);
  overflow: hidden;
  background: var(--graphite-2);
  transition: border-color .15s ease, transform .15s ease;
}
.shot a { position: relative; }
.shot a::after {
  content: "полный размер ↗";
  position: absolute;
  right: 10px;
  top: 10px;
  padding: 5px 10px;
  border-radius: 6px;
  background: rgb(18 21 26 / .82);
  border: 1px solid var(--g-line);
  font: 500 10.5px/1.6 var(--mono);
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--chalk);
  opacity: 0;
  transition: opacity .15s ease;
}
.shot a:hover { border-color: var(--blue-lt); transform: translateY(-2px); }
.shot a:hover::after, .shot a:focus-visible::after { opacity: 1; }
.shot figcaption {
  margin-top: 12px;
  display: flex;
  gap: 12px;
  align-items: baseline;
  font-size: 14.5px;
  color: var(--chalk-2);
}
.shot-mark {
  flex: none;
  font: 500 10.5px/1.7 var(--mono);
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--blue-lt);
  border: 1px solid var(--g-line);
  border-radius: 4px;
  padding: 0 7px;
}

/* --- таблица проверок --------------------------------------------- */

.checks {
  width: 100%;
  border-collapse: collapse;
  font-size: 15.5px;
}
.checks th {
  text-align: left;
  font: 500 11px/1 var(--mono);
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-3);
  padding: 0 16px 12px 0;
  border-bottom: 1px solid var(--line-hi);
}
.checks td { padding: 14px 16px 14px 0; border-bottom: 1px solid var(--line); vertical-align: top; color: var(--ink-2); }
.checks td:first-child { width: 190px; }
.checks .t { font: 500 13.5px/1.5 var(--mono); color: var(--ink); }

.feats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px 32px; margin-top: 56px; }
.feat { border-top: 1px solid var(--line-hi); padding-top: 16px; }
.feat h3 { font: 600 16px/1.35 var(--sans); margin: 0 0 6px; }
.feat p { margin: 0; font-size: 15px; color: var(--ink-2); }

/* --- пак ---------------------------------------------------------- */

.pack-grid { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: 56px; align-items: start; }

/* --- быстрый старт ------------------------------------------------ */

.starts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
.start { display: flex; flex-direction: column; }
.start-t {
  font: 500 11.5px/1 var(--mono);
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 12px;
}
.start h3 { margin-bottom: 12px; }
.start p { margin: 0 0 16px; font-size: 15px; color: var(--ink-2); }
.cmd {
  margin: auto 0 0;
  background: var(--graphite);
  color: var(--chalk);
  border-radius: 8px;
  padding: 16px 18px;
  font: 500 12.5px/1.75 var(--mono);
  white-space: pre-wrap;
  word-break: break-word;
  overflow-x: auto;
}
.cmd .c { color: #6f7b8b; }
.cmd .p { color: var(--blue-lt); }

/* --- темы --------------------------------------------------------- */

.themes { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.theme {
  display: flex;
  align-items: center;
  gap: 11px;
  border: 1px solid var(--line);
  background: var(--paper-hi);
  border-radius: 999px;
  padding: 9px 16px 9px 10px;
  font: 500 13.5px/1 var(--mono);
}
.theme span {
  width: 22px; height: 22px; border-radius: 50%;
  border: 1px solid rgb(0 0 0 / .12);
  flex: none;
}
.theme small { color: var(--ink-3); font: 400 12px/1 var(--sans); }

/* --- подвал ------------------------------------------------------- */

.end { text-align: center; }
.end .h2 { margin-left: auto; margin-right: auto; }
.end .lead { margin-left: auto; margin-right: auto; }
.end-actions { display: flex; justify-content: center; flex-wrap: wrap; gap: 14px; }
.end-note {
  margin-top: 30px;
  font: 500 12.5px/1.7 var(--mono);
  color: var(--chalk-2);
}

.foot {
  border-top: 1px solid var(--g-line);
  padding: 26px 0 34px;
  background: var(--graphite);
  color: var(--chalk-2);
}
.foot-in { display: flex; flex-wrap: wrap; gap: 14px 28px; align-items: center; font: 500 12.5px/1.6 var(--mono); }
.foot-in a { color: var(--chalk-2); }
.foot-in a:hover { color: var(--blue-lt); }
.foot-sep { margin-left: auto; }

/* --- адаптив ------------------------------------------------------ */

@media (max-width: 1020px) {
  .hero-grid { grid-template-columns: minmax(0, 1fr); gap: 44px; }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .step:nth-child(2) { margin-right: 0; }
  .det-grid, .pack-grid { grid-template-columns: minmax(0, 1fr); gap: 36px; }
  .parts, .feats, .starts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .top-nav { display: none; }
}

@media (max-width: 720px) {
  body { font-size: 16px; }
  .band { padding: 64px 0; }
  .hero { padding: 56px 0; }
  .steps, .parts, .feats, .starts, .shots { grid-template-columns: minmax(0, 1fr); }
  .step { margin-right: 0; }
  .shot-wide { grid-column: auto; }
  .brand-sub { display: none; }
  .top-in { height: 60px; gap: 14px; }
  .top-links .btn svg + span { display: none; }
  .top-links .btn { padding: 10px 13px; }
  .end-actions .btn { width: 100%; justify-content: center; }
  .checks td:first-child { width: auto; }
  .checks, .checks tbody, .checks tr, .checks td { display: block; }
  .checks thead { display: none; }
  .checks tr { padding: 14px 0; border-bottom: 1px solid var(--line); }
  .checks td { border: 0; padding: 0 0 4px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .runs-bar i { animation: none; transform: scaleY(1); }
  .btn:hover, .shot a:hover { transform: none; }
}