/* ============================================================
   Case study — «Улучшение UX корзины покупок для sodamoda.ru»
   Тёмная тема. Текст — центрированной колонкой, картинки — на всю ширину.
   ============================================================ */
:root {
  --bg:        #07080b;
  --bg-2:      #0a0c11;
  --card:      #0f1218;
  --card-2:    #14181f;
  --line:      rgba(255, 255, 255, 0.08);
  --line-2:    rgba(255, 255, 255, 0.14);

  --ink:       #f3f5f8;
  --muted:     #9aa1ad;
  --faint:     #5c636e;

  --accent:    #FF090D;                 /* красный — только для выделения текста */
  --good:      #ffffff;                  /* accent-элементы: нейтральный белый (без зелёного) */
  --good-dim:  rgba(255, 255, 255, 0.09);
  --cool:      #cdd4e0;
  --cool-dim:  rgba(205, 212, 224, 0.12);

  --r:         16px;
  --r-lg:      22px;
  --ease:      cubic-bezier(0.16, 1, 0.3, 1);

  --wide:      1120px;
  --text:      900px;    /* ширина читаемой текстовой колонки, как в референсе */
  --pad:       clamp(20px, 5vw, 56px);

  /* ---------- единая система отступов между блоками ---------- */
  --sp-xs:     clamp(18px, 2.4vw, 26px);
  --sp-sm:     clamp(26px, 3.4vw, 40px);
  --sp-md:     clamp(34px, 4.6vw, 54px);
  --sp-lg:     clamp(46px, 6.2vw, 76px);
  --sp-xl:     clamp(62px, 8.4vw, 108px);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; overflow-x: hidden; scroll-padding-top: 72px; }
body { overflow-x: hidden; padding-bottom: 96px; }

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--ink);
  font-size: 17px;
  line-height: 1.6;
  letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { display: block; max-width: 100%; }
a { color: inherit; }
::selection { background: #4d4d4d; color: #fff; }
/* ---------- layout: centered text column ---------- */
.wrap { max-width: var(--wide); margin: 0 auto; padding-inline: var(--pad); }
.col  { max-width: var(--text); margin-inline: auto; }   /* текст посередине */
.section { padding-block: var(--sp-md); }

.eyebrow { font-size: 0.8rem; font-weight: 600; letter-spacing: 0.16em; text-transform: uppercase; color: var(--muted); margin-bottom: 18px; }
.h2 { font-size: clamp(1.9rem, 4vw, 3rem); font-weight: 800; letter-spacing: -0.03em; line-height: 1.05; margin-bottom: 24px; }
.h2--xl { font-size: clamp(2.6rem, 6.4vw, 5.2rem); letter-spacing: -0.04em; line-height: 1.0; }
.h3 { font-size: clamp(1.2rem, 2.2vw, 1.6rem); font-weight: 700; letter-spacing: -0.02em; margin-bottom: 12px; }
.lead { font-size: clamp(1.05rem, 1.6vw, 1.25rem); color: var(--ink); }
p { color: var(--muted); }
p + p { margin-top: 1em; }
.subtitle { color: var(--muted); font-size: 1.1rem; margin-bottom: 32px; }

/* ---------- full-bleed media: картинки на всю ширину экрана ---------- */
.shot {
  width: 100%;
  margin-block: clamp(12px, 1.6vw, 22px);
}
.shot img { width: 100%; display: block; }
.shot__cap { text-align: center; color: var(--faint); font-size: 0.95rem; font-style: italic; padding: 16px var(--pad) 0; }
.shot--pad img { max-width: var(--wide); margin-inline: auto; border-radius: 14px; }

/* ============================ TOP BAR ============================ */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(7, 8, 11, 0.72);
  backdrop-filter: saturate(1.4) blur(14px);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid var(--line);
}
.topbar .wrap { padding-block: 13px; }
.topbar__row { display: flex; align-items: center; justify-content: space-between; }
.topbar__back { display: inline-flex; align-items: center; gap: 8px; font-weight: 600; text-decoration: none; font-size: 0.95rem; }
.topbar__back:hover { color: var(--ink); }
.topbar__lang { font-size: 0.78rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--faint); text-decoration: none; transition: color 0.2s var(--ease); }
.topbar__lang:hover { color: var(--ink); }
.topbar__label { font-size: 0.9rem; color: var(--faint); }
.toc { display: flex; gap: 22px; list-style: none; font-size: 0.9rem; }
.toc a { color: var(--faint); text-decoration: none; transition: color 0.2s var(--ease); }
.toc a:hover { color: var(--ink); }

/* ============================ FLOATING CASE NAV ============================ */
.casedock {
  position: fixed;
  left: 50%;
  bottom: 22px;
  transform: translateX(-50%);
  z-index: 60;
  display: flex;
  gap: 2px;
  max-width: calc(100vw - 28px);
  padding: 6px;
  background: rgba(13, 16, 22, 0.82);
  border: 1px solid var(--line-2);
  border-radius: 100px;
  box-shadow: 0 24px 60px -24px rgba(0, 0, 0, 0.9);
  backdrop-filter: saturate(1.4) blur(16px);
  -webkit-backdrop-filter: saturate(1.4) blur(16px);
  overflow-x: auto;
  scrollbar-width: none;
}
.casedock::-webkit-scrollbar { display: none; }
.casedock a {
  flex: 0 0 auto;
  font-size: 0.86rem;
  font-weight: 500;
  color: var(--muted);
  text-decoration: none;
  padding: 8px 15px;
  border-radius: 100px;
  white-space: nowrap;
  transition: color 0.2s var(--ease), background 0.2s var(--ease);
}
.casedock a:hover { color: var(--ink); background: rgba(255, 255, 255, 0.06); }
.casedock a.active { color: var(--ink); background: rgba(255, 255, 255, 0.12); }

/* ============================ HERO / TITLE ============================ */
.hero { padding-top: var(--sp-xl); }
.hero__meta { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; color: var(--faint); font-size: 0.98rem; margin-bottom: 26px; }
.hero__meta a { color: var(--muted); text-decoration: underline; text-underline-offset: 3px; text-decoration-color: var(--faint); }
.hero__meta a:hover { color: var(--ink); text-decoration-color: var(--ink); }
.hero__badge {
  display: grid; place-items: center;
  width: 28px; height: 28px;
  border-radius: 8px;
  background: var(--card-2);
  border: 1px solid var(--line);
  font-size: 0.82rem; font-weight: 800; color: var(--ink);
}
.hero__title { font-size: clamp(2.4rem, 6.4vw, 5.2rem); font-weight: 800; letter-spacing: -0.04em; line-height: 1.02; }
.hero__lead { margin-top: 26px; font-size: clamp(1.25rem, 2.2vw, 1.7rem); font-weight: 600; line-height: 1.32; letter-spacing: -0.02em; color: var(--ink); }
.specs { list-style: none; margin-top: var(--sp-lg); display: grid; gap: 12px; }
.hero + .shot--pad { margin-top: var(--sp-lg); }
.specs li { position: relative; padding-left: 20px; color: var(--ink); line-height: 1.5; }
.specs li::before { content: "·"; position: absolute; left: 4px; color: var(--faint); }
.specs__k { color: var(--muted); }
.block { margin-top: var(--sp-lg); }
.block__label { font-size: clamp(1.3rem, 2.4vw, 1.9rem); font-weight: 700; letter-spacing: -0.02em; margin-bottom: 16px; }

/* Команда и роли card */
.roles { margin-top: 20px; background: var(--card); border: 1px solid var(--line); border-radius: var(--r-lg); padding: clamp(24px, 4vw, 40px); display: grid; grid-template-columns: 1fr 1.2fr; gap: clamp(24px, 5vw, 56px); }
.roles__k { font-size: 0.82rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--faint); margin-bottom: 8px; }
.roles__v { font-weight: 600; margin-bottom: 20px; color: #fff; }
.roles__v:last-child { margin-bottom: 0; }
.roles ul { list-style: none; }
.roles ul li { position: relative; padding-left: 18px; font-weight: 600; margin-bottom: 6px; color: #fff; }
.roles ul li::before { content: "•"; position: absolute; left: 2px; color: var(--muted); }
.roles__resp { color: #fff; font-weight: 400; line-height: 1.65; }

/* ============================ CALLOUT (research fact) ============================ */
.callout { display: flex; gap: 16px; background: var(--card-2); border: 1px solid var(--line); border-radius: var(--r); padding: 20px 22px; margin-block: 22px; }
.callout__icon { flex: 0 0 auto; width: 30px; height: 30px; border-radius: 50%; display: grid; place-items: center; background: var(--good-dim); color: var(--good); font-size: 1rem; }
.callout p { color: var(--muted); font-size: 0.98rem; margin: 0; }
.callout a { color: var(--ink); text-decoration: underline; text-underline-offset: 3px; text-decoration-color: var(--faint); transition: text-decoration-color 0.2s var(--ease); }
.callout a:hover { text-decoration-color: var(--ink); }

/* ============================ RESEARCH ============================ */
.research__item { margin-top: var(--sp-md); }
.research__item .h3 { color: var(--ink); }
.closing { margin-top: var(--sp-sm); color: var(--muted); }

/* problem notes */
.notes { display: flex; flex-wrap: wrap; gap: 10px 24px; margin-block: 28px; }
.notes span { font-style: italic; color: var(--faint); font-size: 0.98rem; }

/* ============================ HYPOTHESES ============================ */
/* full-width hypotheses section */
.wrap--full { max-width: none; margin: 0 auto; padding-inline: var(--pad); }
.hypos__head { margin-bottom: var(--sp-sm); }

.hypos { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin-top: var(--sp-md); }
.hypo { background: var(--card); border: 1px solid var(--line); border-radius: var(--r); padding: 24px; }
.hypo__tag { display: block; font-size: 0.85rem; font-weight: 600; color: var(--faint); margin-bottom: 12px; }
.hypo p { color: var(--muted); }
.hypo b { color: var(--ink); }

/* Приоритизация — матрица impact/effort */
.matrix-wrap { margin-top: var(--sp-lg); }
.matrix-bleed { width: 100vw; margin-left: calc(50% - 50vw); margin-right: calc(50% - 50vw); }
.matrix {
  position: relative;
  background:
    radial-gradient(90% 130% at 100% 0%, rgba(184, 233, 134, 0.22), transparent 55%),
    radial-gradient(90% 130% at 0% 100%, rgba(255, 138, 120, 0.20), transparent 55%),
    var(--bg-2);
  border-block: 1px solid var(--line);
  aspect-ratio: 16 / 9;
  min-height: 520px;
  overflow: hidden;
}
.matrix__v { position: absolute; left: 50%; top: 6%; bottom: 6%; border-left: 1px dashed var(--line-2); }
.matrix__h { position: absolute; top: 50%; left: 4%; right: 4%; border-top: 1px dashed var(--line-2); }
.matrix__chip { position: absolute; transform: translate(-50%, -50%); font-size: 0.75rem; font-weight: 600; padding: 5px 14px; border-radius: 100px; white-space: nowrap; }
.matrix__chip--good { background: rgba(184, 233, 134, 0.20); color: #cdf0a0; }
.matrix__chip--cool { background: rgba(255, 138, 120, 0.20); color: #ffb3a3; }
.chip-top { left: 50%; top: 5%; }
.chip-bottom { left: 50%; top: 95%; }
.chip-left { left: 6%; top: 50%; }
.chip-right { left: 94%; top: 50%; }
.mcard { position: absolute; transform: translate(-50%, -50%); width: clamp(150px, 20vw, 210px); background: var(--card); border: 1px solid var(--line-2); border-radius: 12px; padding: 12px 14px; box-shadow: 0 12px 30px -18px rgba(0,0,0,0.9); }
.mcard span { display: block; font-size: 0.72rem; color: var(--faint); margin-bottom: 4px; }
.mcard b { font-size: 0.9rem; font-weight: 600; }

/* ============================ SOLUTIONS ============================ */
.solution { padding-top: var(--sp-sm); }
.solution + .solution { margin-top: var(--sp-md); }
.solution__head { display: flex; gap: 10px; align-items: baseline; margin-bottom: 26px; }
.solution__num { font-size: clamp(1.3rem, 2.4vw, 1.9rem); font-weight: 700; letter-spacing: -0.02em; color: var(--ink); line-height: 1.15; flex: 0 0 auto; }
.solution__num::after { content: "."; }
.solution__title { font-size: clamp(1.3rem, 2.4vw, 1.9rem); font-weight: 700; letter-spacing: -0.02em; line-height: 1.15; }
.solution__cols { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(16px, 3vw, 28px); }
.solution__col { background: var(--card); border: 1px solid var(--line); border-radius: var(--r); padding: 22px 24px; }
.solution__col h4 { display: block; font-size: 0.85rem; font-weight: 600; letter-spacing: -0.01em; text-transform: none; color: var(--faint); margin-bottom: 12px; }
.solution__col p { color: var(--ink); margin: 0; }
.solution__col p + p { margin-top: 0.8em; }

/* ============================ UX TESTING ============================ */
.deflist { margin-top: 8px; }
.deflist > div { display: grid; grid-template-columns: 190px 1fr; gap: 24px; padding: 14px 0; }
.deflist dt { font-weight: 700; }
.deflist dd { color: var(--muted); }
.deflist dd ul { list-style: none; display: grid; gap: 8px; }
.deflist dd ul li { position: relative; padding-left: 18px; }
.deflist dd ul li::before { content: "•"; position: absolute; left: 2px; color: var(--good); }

.shots-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 4px; margin-top: var(--sp-sm); }
.shots-2 img { width: 100%; display: block; }

.insights { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-top: 16px; }
.insight { background: var(--card); border: 1px solid var(--line); border-radius: var(--r); padding: 24px; }
.insight__tag { font-size: 0.85rem; font-weight: 600; color: var(--faint); margin-bottom: 10px; }
.insight p { color: var(--muted); }
.insight__fix { color: var(--good); font-size: 0.95rem; margin-top: 12px; }

/* user quotes panel */
.quotes-bleed { width: 100vw; margin-left: calc(50% - 50vw); padding-inline: clamp(12px, 3vw, 48px); margin-top: 16px; }
.quotes {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: clamp(28px, 4vw, 72px);
}
.quotes__grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(32px, 5vw, 72px); }
.quote:nth-child(n+3) { border-top: 1px solid var(--line); padding-top: var(--sp-md); }
.quote__mark { font-size: 2.4rem; line-height: 0.6; color: var(--faint); font-weight: 700; }
.quote__text { margin-top: 12px; font-size: clamp(1.2rem, 2vw, 1.7rem); line-height: 1.38; font-weight: 600; color: var(--muted); letter-spacing: -0.02em; }
.quote__text b { color: var(--ink); font-weight: 700; }
.quote__insight { margin-top: 16px; font-size: clamp(0.95rem, 1.2vw, 1.05rem); color: var(--faint); }
.quote__insight b { color: var(--muted); font-weight: 600; }

.quotes__people { display: flex; align-items: center; gap: 12px; margin-top: var(--sp-md); }
.quotes__avatars { display: flex; }
.avatar {
  width: 38px; height: 38px;
  border-radius: 50%;
  border: 2px solid var(--card);
  background: linear-gradient(135deg, #2a2f39, #14181f);
  margin-left: -10px;
  display: grid; place-items: center;
  font-size: 0.72rem; font-weight: 700; color: var(--ink);
}
.avatar:first-child { margin-left: 0; }
.avatar--more { background: #0b0d11; color: var(--muted); }
.quotes__caption { font-size: 0.92rem; color: var(--faint); }

/* ============================ A/B ============================ */
.goals { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-block: 32px; }
.goals--single { grid-template-columns: 1fr; max-width: 420px; }
.goal { background: var(--card); border: 1px solid var(--line); border-radius: var(--r-lg); padding: 26px 28px; }
.goal__k { font-size: 0.82rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--faint); margin-bottom: 8px; }
.goal__v { font-size: 1.2rem; font-weight: 700; margin-bottom: 18px; }
.goal__k2 { font-size: 0.82rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--faint); margin-bottom: 8px; }
.goal ul { list-style: none; display: grid; gap: 6px; }
.goal ul li { position: relative; padding-left: 18px; color: var(--muted); }
.goal ul li::before { content: "•"; position: absolute; left: 2px; color: var(--good); }

.table-wrap { overflow-x: auto; border-radius: var(--r-lg); border: 1px solid var(--line); margin-top: var(--sp-md); }
table.ab { width: 100%; border-collapse: collapse; background: #0b0d11; font-size: 0.95rem; min-width: 720px; }
table.ab th, table.ab td { text-align: left; padding: 18px 22px; border-bottom: 1px solid var(--line); vertical-align: top; }
table.ab thead th { font-size: 0.82rem; letter-spacing: 0.04em; color: var(--ink); font-weight: 700; }
table.ab tbody tr:last-child td { border-bottom: none; }
table.ab td .delta { font-weight: 700; color: var(--good); }
table.ab td .delta--soft { font-weight: 500; color: var(--muted); }
table.ab td .delta--soft b { color: var(--good); }
.ab__note { margin-top: 24px; color: var(--muted); }

/* ============================ OUTCOME / REFLECTIONS ============================ */
.outcome-list { list-style: none; margin-top: 16px; display: grid; gap: 12px; }
.outcome-list li { position: relative; padding-left: 20px; color: var(--muted); line-height: 1.55; }
.outcome-list li::before { content: "·"; position: absolute; left: 4px; color: var(--faint); }
.outcome-list b { color: var(--ink); font-weight: 700; }

.goal-list { list-style: none; margin-top: 8px; display: grid; gap: 6px; }
.goal-list li { position: relative; padding-left: 20px; color: var(--muted); line-height: 1.55; }
.goal-list li::before { content: "·"; position: absolute; left: 4px; color: var(--faint); }

.reflections { margin-top: 18px; display: grid; gap: clamp(22px, 3vw, 34px); }
.reflection { display: grid; grid-template-columns: auto 1fr; gap: 14px; align-items: start; }
.reflection__mark { font-size: 1.8rem; line-height: 0.9; color: var(--faint); font-weight: 700; }
.reflection p { font-size: clamp(1.15rem, 1.8vw, 1.5rem); font-weight: 700; line-height: 1.36; color: var(--ink); letter-spacing: -0.02em; margin: 0; }

/* ============================ CTA ============================ */
.endcta { border-top: 1px solid var(--line); padding-block: var(--sp-xl); text-align: center; }
.endcta h2 { font-size: clamp(1.8rem, 4vw, 3rem); font-weight: 800; letter-spacing: -0.03em; margin-bottom: 24px; }
.btn { display: inline-flex; align-items: center; gap: 10px; background: var(--ink); color: #0b0d0a; text-decoration: none; font-weight: 600; padding: 15px 28px; border-radius: 100px; transition: transform 0.2s var(--ease), background 0.2s var(--ease); }
.btn:hover { transform: translateY(-2px); background: var(--good); }
.contact a.btn, .contact a.btn:hover { color: #0b0d0a; text-decoration: none; margin-top: var(--sp-sm); }

/* ============================ CONTACT ============================ */
.contact a { color: var(--ink); text-decoration: underline; text-underline-offset: 3px; text-decoration-color: var(--faint); transition: text-decoration-color 0.2s var(--ease); }
.contact a:hover { text-decoration-color: var(--ink); }
.contact__links { margin-top: 10px; color: var(--muted); }
.cardline { display: flex; align-items: center; gap: 14px; margin-top: var(--sp-lg); }
.cardline__badge {
  flex: 0 0 auto;
  width: 46px; height: 46px;
  border-radius: 13px;
  border: 1px solid var(--line-2);
  display: grid; place-items: center;
  font-size: 1.05rem; font-weight: 800; color: var(--ink);
}
.cardline__text { color: var(--muted); }
.cardline__text b { color: var(--ink); font-weight: 700; }

/* ---------- reveal ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* ============================ RESPONSIVE ============================ */
@media (max-width: 860px) {
  .toc { display: none; }
  .roles, .insights, .goals, .shots-2 { grid-template-columns: 1fr; }
  .hypos { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .quotes__grid { grid-template-columns: 1fr; }
  .quote:nth-child(n+2) { border-top: 1px solid var(--line); padding-top: var(--sp-sm); }
  .solution__cols { grid-template-columns: 1fr; }
  .deflist > div { grid-template-columns: 1fr; gap: 6px; }
  .matrix { position: static; display: grid; gap: 10px; padding: 16px; aspect-ratio: auto; min-height: 0; }
  .matrix__v, .matrix__h, .matrix__chip { display: none; }
  .mcard { position: static; transform: none; width: 100%; }
}
@media (max-width: 520px) {
  body { font-size: 16px; }
  .solution__head { gap: 8px; }
  .hypos { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}