/* ==========================================================================
   serp-base.com — лендинг. Тёмная тема, mobile-first.
   Только свой CSS, без внешних библиотек.
   ========================================================================== */

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

:root {
  --bg:          #0f0f14;
  --bg-soft:     #13131b;
  --card:        #171720;
  --card-hi:     #1b1b26;
  --line:        #262636;
  --line-hi:     #35354e;
  --text:        #ececf5;
  --muted:       #9a9ab4;
  --muted-2:     #6f6f8c;
  --violet:      #8b5cf6;
  --violet-hi:   #7c4ce8;
  --violet-soft: rgba(139, 92, 246, .13);
  --orange:      #f97316;
  --orange-soft: rgba(249, 115, 22, .13);
  --green:       #3fbf7f;
  --r:           14px;
  --r-sm:        10px;
  --t:           .25s;
  --ease:        cubic-bezier(.22, .61, .36, 1);
  color-scheme:  dark;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 76px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.62 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  overflow-x: hidden;
}

/* мягкое свечение сверху — не шум, просто глубина */
body::before {
  content: "";
  position: fixed;
  inset: -20% -10% auto -10%;
  height: 520px;
  background:
    radial-gradient(48% 60% at 22% 0%, rgba(139, 92, 246, .16), transparent 70%),
    radial-gradient(42% 55% at 82% 4%, rgba(249, 115, 22, .09), transparent 70%);
  pointer-events: none;
  z-index: 0;
}
main, header, footer { position: relative; z-index: 1; }

[hidden] { display: none !important; }
img, svg { max-width: 100%; }

.wrap { width: 100%; max-width: 1120px; margin: 0 auto; padding: 0 18px; }
.skip {
  position: absolute; left: -9999px; top: 0; z-index: 99;
  background: var(--violet); color: #fff; padding: 8px 14px; border-radius: 0 0 8px 0;
}
.skip:focus { left: 0; }

h1, h2, h3 { margin: 0 0 10px; line-height: 1.2; letter-spacing: -.015em; }
h1 { font-size: clamp(28px, 5.4vw, 46px); line-height: 1.1; letter-spacing: -.025em; }
h2 { font-size: clamp(23px, 3.4vw, 32px); }
h3 { font-size: 16px; }
p  { margin: 0 0 12px; }
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  font-size: .92em;
  color: #cfc6ff;
  background: rgba(139, 92, 246, .10);
  border-radius: 5px;
  padding: 1px 5px;
}
a { color: inherit; }

/* ============================== КНОПКИ ================================= */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 22px;
  border-radius: var(--r-sm);
  border: 1px solid transparent;
  font: inherit; font-size: 15px; font-weight: 600;
  text-decoration: none; cursor: pointer;
  transition: background var(--t) var(--ease), border-color var(--t) var(--ease),
              box-shadow var(--t) var(--ease), transform .2s var(--ease), color var(--t);
}
.btn-primary {
  background: var(--violet); color: #fff;
  box-shadow: 0 6px 20px rgba(139, 92, 246, .22);
}
.btn-primary:hover { background: var(--violet-hi); box-shadow: 0 10px 26px rgba(139, 92, 246, .3); }
.btn-ghost {
  background: rgba(255, 255, 255, .02); color: var(--text); border-color: var(--line-hi);
}
.btn-ghost:hover { border-color: var(--violet); background: var(--violet-soft); }
.btn:active { transform: translateY(1px); }
.btn-block { width: 100%; margin-top: 4px; }

/* ============================== ШАПКА ================================== */
.hd {
  position: sticky; top: 0; z-index: 40;
  background: rgba(15, 15, 20, .84);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, .045);
}
.hd-in { display: flex; align-items: center; gap: 14px; min-height: 62px; }

.logo { display: inline-flex; align-items: center; gap: 9px; text-decoration: none; }
.logo-mark {
  display: grid; place-items: center;
  width: 32px; height: 32px; border-radius: 9px;
  color: var(--violet);
  background: var(--violet-soft);
  border: 1px solid rgba(139, 92, 246, .3);
}
.logo-mark svg { width: 18px; height: 18px; }
.logo-text { font-size: 18px; font-weight: 700; letter-spacing: -.02em; }
.logo-text span { color: var(--orange); }

.top-nav { display: none; margin-left: auto; gap: 4px; }
.top-nav a {
  padding: 8px 14px; border-radius: 999px;
  font-size: 14px; color: var(--muted); text-decoration: none;
  transition: color var(--t) var(--ease), background var(--t) var(--ease);
}
.top-nav a:hover { color: var(--text); background: rgba(255, 255, 255, .04); }

.auth { margin-left: auto; display: flex; align-items: center; }
.top-nav + .auth { margin-left: 0; }

.btn-login {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 16px; border-radius: 999px;
  background: rgba(255, 255, 255, .03);
  border: 1px solid var(--line-hi);
  color: var(--text); font: inherit; font-size: 14px; font-weight: 600;
  cursor: pointer;
  transition: border-color var(--t) var(--ease), background var(--t) var(--ease), color var(--t);
}
.btn-login svg { width: 16px; height: 16px; color: var(--violet); }
.btn-login:hover { border-color: var(--violet); background: var(--violet-soft); }

.auth-user { position: relative; }
.user-btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 5px 12px 5px 5px; border-radius: 999px;
  background: rgba(255, 255, 255, .03);
  border: 1px solid var(--line-hi);
  color: var(--text); font: inherit; font-size: 14px; cursor: pointer;
  transition: border-color var(--t) var(--ease), background var(--t) var(--ease);
}
.user-btn:hover { border-color: var(--violet); background: var(--violet-soft); }
.avatar {
  display: grid; place-items: center;
  width: 28px; height: 28px; border-radius: 50%;
  background: linear-gradient(140deg, var(--violet), var(--orange));
  color: #fff; font-size: 13px; font-weight: 700; text-transform: uppercase;
}
.user-name { max-width: 150px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tick { width: 15px; height: 15px; color: var(--violet); flex: none; }

.user-menu {
  position: absolute; right: 0; top: calc(100% + 8px);
  min-width: 190px; padding: 6px;
  background: var(--card-hi);
  border: 1px solid var(--line-hi);
  border-radius: 12px;
  box-shadow: 0 18px 40px rgba(0, 0, 0, .45);
  animation: pop .2s var(--ease);
}
@keyframes pop { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: none; } }
.user-menu a, .user-menu button {
  display: block; width: 100%; text-align: left;
  padding: 9px 12px; border-radius: 8px; border: 0; background: none;
  color: var(--muted); font: inherit; font-size: 14px; text-decoration: none; cursor: pointer;
  transition: color var(--t), background var(--t);
}
.user-menu a:hover, .user-menu button:hover { color: var(--text); background: rgba(255, 255, 255, .05); }

/* ============================== HERO =================================== */
.hero { padding: 44px 0 8px; }
.hero-grid { display: grid; gap: 28px; align-items: center; }

.kicker {
  display: inline-block; margin-bottom: 14px;
  font-size: 12px; letter-spacing: .1em; text-transform: uppercase;
  color: var(--violet);
}
.lead { color: var(--muted); font-size: clamp(15px, 2.2vw, 17px); max-width: 46ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 20px 0 22px; }

.stats { list-style: none; margin: 0; padding: 0; display: grid; gap: 9px; }
.stats li { display: flex; gap: 10px; align-items: baseline; font-size: 14px; color: var(--muted); }
.stats b { color: var(--orange); font-size: 16px; min-width: 62px; flex: none; }

.code-card { padding: 16px; }

/* ============================ КАРТОЧКИ/КОД ============================= */
.card {
  background: linear-gradient(180deg, var(--card), #141420);
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 18px;
  min-width: 0;
}

/* grid-элементы должны уметь сжиматься, иначе длинные строки кода
   растягивают колонку и ломают раскладку на телефоне */
.hero-grid > *,
.demo-grid > *,
.steps > *,
.notes > *,
.tools > *,
.cta > * { min-width: 0; }

.code-card, .demo-out { max-width: 100%; }
pre { max-width: 100%; }

.code-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 10px; }
.code-lang {
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 12px; letter-spacing: .06em; text-transform: lowercase; color: var(--muted-2);
}
.copy {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 12px; border-radius: 999px;
  background: var(--bg-soft); border: 1px solid var(--line);
  color: var(--muted); font: inherit; font-size: 12px; cursor: pointer;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease), background var(--t);
}
.copy svg { width: 14px; height: 14px; }
.copy:hover { color: var(--text); border-color: var(--violet); background: var(--violet-soft); }
.copy.done { color: var(--orange); border-color: rgba(249, 115, 22, .45); }

pre {
  margin: 0;
  padding: 15px;
  background: #101018;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow-x: auto;
  font-size: 12.5px; line-height: 1.7;
}
pre code {
  background: none; padding: 0; color: #d3d3e8;
  font-size: inherit;
  white-space: pre;
}
pre.out { min-height: 240px; }
.code-foot { margin: 10px 0 0; font-size: 13px; color: var(--muted-2); }
.code-foot b { color: var(--violet); font-weight: 600; }

/* ============================== СЕКЦИИ ================================= */
.sec { padding: 62px 0; }
.sec-head { margin-bottom: 26px; }
.sec-sub { color: var(--muted); max-width: 62ch; margin: 0; }

/* ============================ ИНСТРУМЕНТЫ ============================== */
.grid { display: grid; gap: 12px; }
.tools { grid-template-columns: 1fr; }

.tool { display: flex; flex-direction: column; gap: 8px; padding: 16px; }
.tool:hover { border-color: var(--line-hi); background: linear-gradient(180deg, var(--card-hi), #16161f); }
.tool .ic {
  display: grid; place-items: center;
  width: 38px; height: 38px; border-radius: 11px; margin-bottom: 4px;
  color: var(--violet); background: var(--violet-soft);
  border: 1px solid rgba(139, 92, 246, .26);
}
.tool .ic svg { width: 20px; height: 20px; }
.tool:nth-child(4n+2) .ic {
  color: var(--orange); background: var(--orange-soft); border-color: rgba(249, 115, 22, .26);
}
.tool h3 { margin: 0; }
.tool p { margin: 0; font-size: 13.5px; color: var(--muted); }
.tool .price { margin-top: auto; padding-top: 10px; font-size: 13px; color: var(--muted-2); }
.tool .price b { color: var(--orange); font-size: 15px; }

/* ============================== ДЕМО =================================== */
.demo-grid { display: grid; gap: 14px; }
.demo-form { display: block; }
.demo-form .btn-block { margin-top: 16px; }
.status { margin: 14px 0 0; }
.pill { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; color: var(--muted); }
.pdot { width: 8px; height: 8px; border-radius: 50%; background: var(--muted-2); transition: background var(--t); }
.pill.on  .pdot { background: var(--green); box-shadow: 0 0 0 4px rgba(63, 191, 127, .13); }
.pill.off .pdot { background: var(--orange); box-shadow: 0 0 0 4px rgba(249, 115, 22, .13); }
.hint { margin: 12px 0 0; font-size: 13px; color: var(--muted-2); }
.demo-out { display: flex; flex-direction: column; }
.demo-out pre { flex: 1; }

/* ============================== ФОРМЫ ================================== */
.field { display: block; margin-bottom: 14px; }
.field > span { display: block; margin-bottom: 6px; font-size: 13px; color: var(--muted); }
input, select {
  width: 100%;
  padding: 11px 13px;
  border-radius: var(--r-sm);
  border: 1px solid var(--line);
  background: var(--bg-soft);
  color: var(--text);
  font: inherit; font-size: 15px;
  transition: border-color var(--t) var(--ease), background var(--t) var(--ease);
}
input:focus, select:focus { outline: none; border-color: var(--violet); background: #15151f; }
input::placeholder { color: var(--muted-2); }

/* ============================ КАК НАЧАТЬ =============================== */
.steps { display: grid; gap: 10px; }
.step { position: relative; padding-top: 20px; }
.step-num {
  display: grid; place-items: center;
  width: 26px; height: 26px; margin-bottom: 10px;
  border-radius: 8px;
  background: var(--violet-soft); border: 1px solid rgba(139, 92, 246, .3);
  color: var(--violet); font-size: 13px; font-weight: 700;
}
.step h3 { margin: 0 0 6px; }
.step p { margin: 0; font-size: 13.5px; color: var(--muted); }
.step-arrow { display: grid; place-items: center; color: var(--muted-2); }
.step-arrow svg { width: 30px; height: 14px; transform: rotate(90deg); }

/* ============================== ТАРИФЫ ================================= */
.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: linear-gradient(180deg, var(--card), #141420);
}
.price-table { width: 100%; min-width: 560px; border-collapse: collapse; font-size: 14px; }
.price-table th, .price-table td {
  padding: 12px 14px; text-align: left;
  border-bottom: 1px solid var(--line);
}
.price-table th {
  font-size: 11.5px; font-weight: 600; letter-spacing: .07em; text-transform: uppercase;
  color: var(--muted-2);
}
.price-table td:first-child { color: var(--text); }
.price-table td b { color: var(--orange); }
.price-table tbody tr:last-child td { border-bottom: 0; }
.price-table tbody tr { transition: background var(--t) var(--ease); }
.price-table tbody tr:hover { background: rgba(139, 92, 246, .05); }
.price-table code { background: rgba(255, 255, 255, .04); color: var(--muted); }

.notes { display: grid; gap: 12px; margin-top: 16px; }
.note h3 { margin: 0 0 8px; font-size: 15px; }
.note p { margin: 0; font-size: 13.5px; color: var(--muted); }
.note-accent { border-color: rgba(139, 92, 246, .35); background: linear-gradient(180deg, rgba(139, 92, 246, .09), #141420); }
.note-accent h3 { color: var(--violet); }

/* ============================ ПРИМЕРЫ КОДА ============================= */
.tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.tab {
  padding: 7px 18px; border-radius: 999px;
  background: transparent; border: 1px solid var(--line);
  color: var(--muted); font: inherit; font-size: 13px; font-weight: 600; cursor: pointer;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease), background var(--t) var(--ease);
}
.tab:hover { color: var(--text); border-color: var(--line-hi); }
.tab.is-active { color: #fff; border-color: var(--violet); background: var(--violet-soft); }
.pane { display: none; animation: fade .28s var(--ease); }
.pane.is-active { display: block; }
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }

/* =============================== FAQ =================================== */
.faq { display: grid; gap: 10px; }
.faq details {
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: linear-gradient(180deg, var(--card), #141420);
  transition: border-color var(--t) var(--ease);
}
.faq details[open] { border-color: var(--line-hi); }
.faq summary {
  position: relative;
  padding: 15px 46px 15px 16px;
  font-size: 15px; font-weight: 600;
  cursor: pointer; list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "";
  position: absolute; right: 18px; top: 50%;
  width: 9px; height: 9px;
  border-right: 2px solid var(--violet); border-bottom: 2px solid var(--violet);
  transform: translateY(-70%) rotate(45deg);
  transition: transform var(--t) var(--ease);
}
.faq details[open] summary::after { transform: translateY(-30%) rotate(-135deg); }
.faq p { margin: 0; padding: 0 16px 16px; font-size: 14px; color: var(--muted); }

/* =============================== CTA =================================== */
.cta-sec { padding-bottom: 34px; }
.cta {
  display: grid; gap: 16px; align-items: center;
  border-color: rgba(139, 92, 246, .3);
  background: linear-gradient(120deg, rgba(139, 92, 246, .12), rgba(249, 115, 22, .07) 70%, #141420);
}
.cta h2 { margin: 0 0 6px; }
.cta p { margin: 0; color: var(--muted); font-size: 14px; }
.cta .btn { justify-self: start; }

/* ============================== ФУТЕР ================================== */
.ft { border-top: 1px solid var(--line); background: rgba(15, 15, 20, .6); padding: 28px 0 20px; margin-top: 20px; }
.ft-in { display: flex; flex-wrap: wrap; gap: 18px 26px; align-items: center; }
.ft-brand { display: grid; gap: 4px; }
.ft-note { margin: 0; font-size: 13px; color: var(--muted-2); }
.ft-links { display: flex; flex-wrap: wrap; gap: 6px 16px; }
.ft-links a {
  font-size: 13.5px; color: var(--muted); text-decoration: none;
  transition: color var(--t) var(--ease);
}
.ft-links a:hover { color: var(--violet); }
.lang { display: flex; gap: 6px; margin-left: auto; }
.lang-btn {
  padding: 6px 12px; border-radius: 999px;
  background: transparent; border: 1px solid var(--line);
  color: var(--muted); font: inherit; font-size: 12px; font-weight: 700; letter-spacing: .04em;
  cursor: pointer;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease), background var(--t) var(--ease);
}
.lang-btn:hover { color: var(--text); }
.lang-btn.is-active { color: #fff; border-color: var(--violet); background: var(--violet-soft); }
.ft-bottom {
  display: flex; flex-wrap: wrap; gap: 6px 18px; justify-content: space-between;
  margin-top: 20px; padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, .045);
  font-size: 12.5px; color: var(--muted-2);
}

/* ============================== МОДАЛКА ================================ */
.modal { position: fixed; inset: 0; z-index: 60; display: grid; place-items: center; padding: 16px; }
.modal-bd { position: absolute; inset: 0; background: rgba(8, 8, 12, .72); backdrop-filter: blur(3px); }
.modal-card {
  position: relative;
  width: min(400px, 100%);
  padding: 22px;
  background: var(--card-hi);
  border: 1px solid var(--line-hi);
  border-radius: 16px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, .55);
  animation: rise .26s var(--ease);
}
@keyframes rise { from { opacity: 0; transform: translateY(10px) scale(.985); } to { opacity: 1; transform: none; } }
.modal-card h3 { margin: 0 0 6px; }
.modal-sub { margin: 0 0 18px; font-size: 13px; color: var(--muted-2); }
.modal-x {
  position: absolute; top: 10px; right: 12px;
  width: 30px; height: 30px; border-radius: 50%;
  background: none; border: 0; color: var(--muted-2);
  font-size: 22px; line-height: 1; cursor: pointer;
  transition: color var(--t), background var(--t);
}
.modal-x:hover { color: var(--text); background: rgba(255, 255, 255, .05); }

/* =============================== ТОСТ ================================== */
.toast {
  position: fixed; left: 50%; bottom: 22px; z-index: 70;
  transform: translate(-50%, 10px);
  padding: 10px 18px; border-radius: 999px;
  background: var(--card-hi); border: 1px solid rgba(139, 92, 246, .45);
  color: var(--text); font-size: 13.5px;
  box-shadow: 0 14px 34px rgba(0, 0, 0, .5);
  opacity: 0;
  transition: opacity var(--t) var(--ease), transform var(--t) var(--ease);
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ======================= ПОЯВЛЕНИЕ ПРИ СКРОЛЛЕ ========================= */
/* opacity:0 только когда JS доступен — без JS контент виден сразу */
.js .reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .3s var(--ease), transform .3s var(--ease);
  transition-delay: var(--d, 0s);
}
.js .reveal.is-in { opacity: 1; transform: none; }

/* ============================== БРЕЙКПОИНТЫ ============================ */
@media (min-width: 640px) {
  .wrap { padding: 0 24px; }
  .tools { grid-template-columns: repeat(2, 1fr); }
  .hd-in { min-height: 66px; }
}

@media (min-width: 860px) {
  .top-nav { display: flex; }
  .sec { padding: 84px 0; }
  .hero { padding: 66px 0 16px; }
  .steps { grid-template-columns: 1fr auto 1fr auto 1fr; align-items: stretch; }
  .step-arrow svg { transform: none; }
  .notes { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 900px) {
  .demo-grid { grid-template-columns: 1fr 1.15fr; }
  .cta { grid-template-columns: 1fr auto; }
  .cta .btn { justify-self: end; }
}

@media (min-width: 960px) {
  .hero-grid { grid-template-columns: 1.05fr 1fr; gap: 40px; }
  .tools { grid-template-columns: repeat(3, 1fr); }
}

/* шапка на узких экранах: длинный email не должен растягивать страницу */
@media (max-width: 520px) {
  .logo-text { font-size: 17px; }
  .user-name { max-width: 88px; }
  .hd-in { gap: 10px; }
}

/* ========================= УВАЖЕНИЕ К НАСТРОЙКАМ ======================= */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .reveal { opacity: 1; transform: none; transition: none; }
  *, *::before, *::after { animation-duration: .001s !important; transition-duration: .001s !important; }
}

/* ==== вход/регистрация: вкладки-пилюли, отступы, сообщения ==== */
.auth-tabs{display:flex;gap:6px;margin:4px 0 18px;padding:4px;background:rgba(255,255,255,.04);
  border-radius:999px;border:1px solid rgba(255,255,255,.07)}
.auth-tab{flex:1;padding:10px 14px;border:0;border-radius:999px;background:transparent;color:#9a9ab0;
  font:inherit;font-size:14px;cursor:pointer;transition:background .22s cubic-bezier(.22,.61,.36,1),color .22s}
.auth-tab:hover{color:#ececf5}
.auth-tab.on{background:linear-gradient(135deg,#8b5cf6,#a855f7);color:#fff;
  box-shadow:0 4px 14px rgba(139,92,246,.28)}
.auth-msg{margin:2px 0 14px;padding:11px 14px;border-radius:12px;font-size:13.5px;line-height:1.45}
.auth-msg.err{background:rgba(249,115,22,.1);border:1px solid rgba(249,115,22,.32);color:#fdba74}
.auth-msg.ok{background:rgba(34,197,94,.1);border:1px solid rgba(34,197,94,.3);color:#86efac}
/* кнопка «Регистрация» под «Войти» — отступ как у соседних кнопок формы */
#authSubmit{margin-bottom:22px}
.auth-alt{margin-top:0}
.auth-tabs{display:none}
.modal-card .field+.field{margin-top:14px}
.modal-card .btn-block{width:100%}