/* Spark Chat Landing — chat.kidion.ru
   Built on same tokens as chat.css (Geist, oklch).
   Adds landing-page sections: hero, features, safety, characters, pricing, footer. */

/* ============ Page shell ============ */
.sp {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  letter-spacing: -0.005em;
}
.sp * { box-sizing: border-box; }
.sp button { font-family: inherit; cursor: pointer; }

/* ============ Top nav ============ */
.sp-nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  position: sticky; top: 0; z-index: 5;
}
@media (min-width: 769px) { .sp-nav { padding: 16px 40px; } }

.sp-brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 600; font-size: 17px;
  letter-spacing: -0.022em;
  text-decoration: none;
  color: var(--text);
}
.sp-brand-mark {
  width: 32px; height: 32px; border-radius: 10px;
  background: var(--spark-grad);
  display: grid; place-items: center;
  color: white; font-weight: 700; font-size: 16px;
  box-shadow: inset 0 -3px 8px rgba(0,0,0,0.15), 0 1px 2px rgba(70,40,110,0.20);
  position: relative; overflow: hidden;
}
.sp-brand-mark::after {
  content: ""; position: absolute; top: 8px; right: 8px;
  width: 4px; height: 4px; background: white; border-radius: 50%;
  opacity: 0.85; box-shadow: 0 0 6px rgba(255,255,255,0.6);
}

.sp-nav-links {
  display: none; align-items: center; gap: 4px;
  list-style: none; margin: 0; padding: 0;
}
@media (min-width: 769px) { .sp-nav-links { display: flex; } }
/* Mobile menu open */
@media (max-width: 768px) {
  .sp-nav-links.is-open {
    display: flex; flex-direction: column;
    position: absolute; top: 100%; left: 0; right: 0;
    background: var(--surface); border-bottom: 1px solid var(--border);
    padding: 12px 20px 16px; gap: 4px; z-index: 10;
    box-shadow: 0 8px 24px -8px rgba(15,18,35,0.12);
  }
  .sp-nav-links.is-open .sp-nav-link { display: block; width: 100%; padding: 10px 12px; }
  .sp-nav { position: relative; }
}
.sp-nav-link {
  padding: 8px 12px;
  font-size: 14px;
  color: var(--text-2);
  text-decoration: none;
  border-radius: 8px;
  transition: background .12s, color .12s;
}
.sp-nav-link:hover { background: var(--surface-2); color: var(--text); }

.sp-nav-cta { display: flex; align-items: center; gap: 8px; }
.sp-nav-login { display: none; }
@media (min-width: 769px) { .sp-nav-login { display: inline-flex; } }
.sp-nav-burger {
  display: inline-flex;
  width: 36px; height: 36px;
  border-radius: 9px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  align-items: center; justify-content: center;
  padding: 0;
}
@media (min-width: 769px) { .sp-nav-burger { display: none; } }

/* ============ Buttons ============ */
.sp-btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px;
  height: 40px; padding: 0 16px;
  border-radius: 10px;
  font-size: 14px; font-weight: 500;
  letter-spacing: -0.005em;
  border: 1px solid transparent;
  transition: background .12s, border-color .12s, box-shadow .12s, transform .08s;
  white-space: nowrap;
  background: none;
  color: var(--text);
  font-family: inherit;
  text-decoration: none;
}
.sp-btn-primary {
  background: var(--spark-grad);
  color: white;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.20), 0 1px 2px rgba(70,40,110,0.20), 0 6px 16px -8px rgba(70,40,110,0.30);
}
.sp-btn-primary:hover { filter: brightness(1.06); transform: translateY(-1px); }
.sp-btn-ghost {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border);
}
.sp-btn-ghost:hover { background: var(--surface-2); }
.sp-btn-lg { height: 48px; padding: 0 22px; font-size: 15px; border-radius: 12px; }
.sp-btn-block { width: 100%; }
.sp-btn-sub {
  font-size: 11.5px;
  opacity: 0.78;
  font-weight: 400;
  margin-left: 2px;
}

/* ============ Containers ============ */
.sp-container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
}
@media (min-width: 769px) { .sp-container { padding: 0 40px; } }

.sp-section { padding: 44px 0; }
@media (min-width: 769px) { .sp-section { padding: 88px 0; } }

.sp-section-head {
  text-align: center;
  margin: 0 auto 28px;
  max-width: 640px;
}
@media (min-width: 769px) { .sp-section-head { margin-bottom: 56px; } }

.sp-eyebrow {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px 4px 8px;
  border-radius: 999px;
  background: var(--spark-violet-soft);
  border: 1px solid var(--spark-violet-border);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--spark-violet-ink);
  margin-bottom: 14px;
}
.sp-eyebrow::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--spark-violet);
  box-shadow: 0 0 0 3px var(--spark-violet-softer);
}

.sp-h2 {
  margin: 0 0 12px;
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.028em;
  line-height: 1.12;
}
@media (min-width: 769px) { .sp-h2 { font-size: 40px; } }

.sp-section-sub {
  margin: 0;
  font-size: 14.5px;
  color: var(--text-2);
  line-height: 1.55;
}
@media (min-width: 769px) { .sp-section-sub { font-size: 16px; } }

/* ============ HERO ============ */
.sp-hero {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  padding: 32px 0 48px;
}
@media (min-width: 769px) { .sp-hero { padding: 72px 0 96px; } }

.sp-hero::before {
  content: "";
  position: absolute;
  top: -160px; left: -120px;
  width: 520px; height: 520px;
  border-radius: 50%;
  background: radial-gradient(circle, oklch(0.82 0.16 295) 0%, transparent 65%);
  opacity: 0.35; z-index: -2; filter: blur(20px);
}
.sp-hero::after {
  content: "";
  position: absolute;
  bottom: -180px; right: -120px;
  width: 560px; height: 560px;
  border-radius: 50%;
  background: radial-gradient(circle, oklch(0.85 0.13 55) 0%, transparent 60%);
  opacity: 0.4; z-index: -2; filter: blur(20px);
}

.sp-hero-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: center;
}
@media (min-width: 769px) {
  .sp-hero-inner { grid-template-columns: 1.05fr 1fr; gap: 56px; }
}

.sp-hero-pill {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 5px 12px 5px 5px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 12.5px;
  color: var(--text-2);
  margin-bottom: 22px;
}
.sp-hero-pill-tag {
  background: var(--spark-grad);
  color: white;
  font-size: 10.5px; font-weight: 600;
  letter-spacing: 0.04em; text-transform: uppercase;
  padding: 3px 9px; border-radius: 999px;
}

.sp-h1 {
  margin: 0 0 18px;
  font-size: 36px;
  font-weight: 600;
  letter-spacing: -0.032em;
  line-height: 1.04;
}
@media (min-width: 769px) { .sp-h1 { font-size: 60px; } }
.sp-grad-text {
  background: var(--spark-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.sp-hero-sub {
  margin: 0 0 28px;
  font-size: 15.5px;
  color: var(--text-2);
  line-height: 1.55;
  max-width: 36ch;
}
@media (min-width: 769px) { .sp-hero-sub { font-size: 18px; max-width: 42ch; } }

.sp-hero-ctas {
  display: flex; gap: 10px; flex-wrap: wrap;
  margin-bottom: 22px;
}

.sp-hero-trust {
  display: flex; align-items: center; gap: 14px;
  font-size: 12.5px; color: var(--text-3); flex-wrap: wrap;
}
.sp-hero-trust-item { display: inline-flex; align-items: center; gap: 6px; }
.sp-hero-trust-check { width: 14px; height: 14px; flex: 0 0 14px; color: oklch(0.55 0.13 158); }

/* Hero stage (right side — Spark + chat mockup) */
.sp-hero-stage {
  position: relative;
  isolation: isolate;
  display: flex;
  justify-content: center;
  align-items: flex-end;
  min-height: 380px;
}
@media (min-width: 769px) { .sp-hero-stage { min-height: 440px; } }

.sp-hero-spark {
  position: absolute;
  top: -12px; left: 50%;
  transform: translateX(-30%);
  width: 220px; height: auto;
  z-index: 2;
  filter: drop-shadow(0 14px 24px rgba(74,35,110,0.18));
  pointer-events: none;
  animation: sp-bob 5s ease-in-out infinite;
}
@media (min-width: 769px) {
  .sp-hero-spark { width: 280px; top: -24px; transform: translateX(-40%); animation-name: sp-bob-d; }
}
@keyframes sp-bob {
  0%, 100% { transform: translateX(-30%) translateY(0); }
  50%      { transform: translateX(-30%) translateY(-8px); }
}
@keyframes sp-bob-d {
  0%, 100% { transform: translateX(-40%) translateY(0); }
  50%      { transform: translateX(-40%) translateY(-10px); }
}

.sp-hero-sparkle {
  position: absolute;
  font-size: 24px;
  pointer-events: none;
  filter: drop-shadow(0 2px 4px rgba(70,40,110,0.15));
  z-index: 1;
}
.sp-hero-sparkle.s1 { top: 30px; left: -8px; animation: sp-float 6s ease-in-out infinite; }
.sp-hero-sparkle.s2 { top: 80px; right: 10px; animation: sp-float 5s ease-in-out infinite 0.7s; }
.sp-hero-sparkle.s3 { bottom: 18px; left: 8px; animation: sp-float 7s ease-in-out infinite 0.3s; }
@keyframes sp-float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50%      { transform: translateY(-6px) rotate(8deg); }
}

.sp-hero-chat {
  position: relative;
  width: 100%; max-width: 340px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 18px 16px 16px;
  box-shadow: 0 1px 2px rgba(30,20,60,0.04), 0 18px 50px -18px rgba(70,40,110,0.25);
  margin-top: 140px;
}
@media (min-width: 769px) { .sp-hero-chat { max-width: 380px; margin-top: 160px; } }

.sp-hero-chat-head {
  display: flex; align-items: center; gap: 10px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 14px;
}
.sp-hero-chat-av {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--spark-grad);
  display: grid; place-items: center;
  color: white; font-size: 18px;
}
.sp-hero-chat-name { margin: 0; font-size: 14px; font-weight: 600; letter-spacing: -0.012em; }
.sp-hero-chat-status {
  margin: 1px 0 0;
  font-size: 11.5px;
  color: oklch(0.52 0.12 158);
  display: inline-flex; align-items: center; gap: 5px;
}
.sp-hero-chat-status::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: oklch(0.62 0.14 158);
  box-shadow: 0 0 0 2px oklch(0.96 0.05 158);
}

.sp-hero-msgs { display: flex; flex-direction: column; gap: 8px; }
.sp-msg {
  max-width: 78%;
  padding: 9px 12px;
  font-size: 13.5px;
  line-height: 1.45;
  border-radius: 14px;
}
.sp-msg-user {
  align-self: flex-end;
  background: var(--spark-violet-soft);
  color: var(--spark-violet-ink);
  border-bottom-right-radius: 4px;
}
.sp-msg-bot {
  align-self: flex-start;
  background: var(--surface-2);
  color: var(--text);
  border-bottom-left-radius: 4px;
}
.sp-msg-bot strong { font-weight: 600; }
.sp-msg-typing {
  align-self: flex-start;
  background: var(--surface-2);
  border-bottom-left-radius: 4px;
  padding: 11px 14px;
}
.sp-typing-dots { display: inline-flex; gap: 3px; }
.sp-typing-dots span {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--text-4);
  animation: sp-dot 1.2s ease-in-out infinite;
}
.sp-typing-dots span:nth-child(2) { animation-delay: 0.15s; }
.sp-typing-dots span:nth-child(3) { animation-delay: 0.30s; }
@keyframes sp-dot {
  0%, 60%, 100% { opacity: 0.35; transform: translateY(0); }
  30%           { opacity: 1; transform: translateY(-2px); }
}

.sp-hero-input {
  margin-top: 12px;
  display: flex; align-items: center; gap: 8px;
  padding: 8px 8px 8px 14px;
  background: var(--surface-2);
  border-radius: 999px;
  border: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-3);
}
.sp-hero-input-send {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--spark-grad);
  display: grid; place-items: center;
  color: white; margin-left: auto; flex: 0 0 32px;
}

/* ============ Features ============ */
.sp-feats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
@media (min-width: 769px) { .sp-feats { grid-template-columns: repeat(4, 1fr); gap: 16px; } }

.sp-feat {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px 20px 20px;
  display: flex; flex-direction: column;
  gap: 10px;
  transition: border-color .12s, box-shadow .12s, transform .12s;
}
.sp-feat:hover { border-color: var(--spark-violet-border); transform: translateY(-2px); }
.sp-feat-icon {
  width: 52px; height: 52px;
  border-radius: 14px;
  background: linear-gradient(135deg, oklch(0.97 0.025 295) 0%, oklch(0.965 0.030 35) 100%);
  border: 1px solid var(--spark-violet-border);
  display: grid; place-items: center;
  font-size: 24px; margin-bottom: 6px;
}
.sp-feat-title { margin: 0; font-size: 16px; font-weight: 600; letter-spacing: -0.018em; }
.sp-feat-body { margin: 0; font-size: 13.5px; color: var(--text-2); line-height: 1.5; }
.sp-feat-tag { margin-top: auto; padding-top: 12px; font-size: 11.5px; color: var(--text-3); font-family: var(--font-mono); }

/* ============ Safety ============ */
.sp-safety {
  background:
    radial-gradient(80% 60% at 0% 0%, var(--spark-violet-softer) 0%, transparent 60%),
    radial-gradient(70% 80% at 100% 100%, oklch(0.985 0.018 60) 0%, transparent 60%),
    var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.sp-safety-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
@media (min-width: 769px) { .sp-safety-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; } }

.sp-safety-item {
  display: flex; gap: 16px;
  padding: 22px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  align-items: flex-start;
}
.sp-safety-icon {
  flex: 0 0 44px;
  width: 44px; height: 44px;
  border-radius: 12px;
  background: var(--spark-violet-soft);
  border: 1px solid var(--spark-violet-border);
  display: grid; place-items: center;
  color: var(--spark-violet-ink);
}
.sp-safety-title { margin: 0 0 4px; font-size: 15.5px; font-weight: 600; letter-spacing: -0.015em; }
.sp-safety-body { margin: 0; font-size: 13.5px; color: var(--text-2); line-height: 1.5; }

/* ============ Characters ============ */
.sp-chars {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
@media (min-width: 769px) { .sp-chars { grid-template-columns: repeat(4, 1fr); gap: 16px; } }

.sp-char {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px 18px 18px;
  display: flex; flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 4px;
  overflow: hidden; isolation: isolate;
}
.sp-char::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 110px;
  background: radial-gradient(100% 90% at 50% 0%, var(--char-tint, var(--spark-violet-soft)) 0%, transparent 70%);
  z-index: -1;
}
.sp-char-av {
  width: 96px; height: 96px;
  border-radius: 50%;
  display: grid; place-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  margin-bottom: 10px;
  box-shadow: 0 6px 18px -8px rgba(40,25,80,0.18);
  overflow: hidden;
}
.sp-char-av img { width: 100%; height: 100%; object-fit: cover; object-position: center 18%; transform: scale(1.08); }
.sp-char-av svg { width: 100%; height: 100%; }
.sp-char-name { margin: 0; font-size: 17px; font-weight: 600; letter-spacing: -0.018em; }
.sp-char-role { margin: 0; font-size: 12px; color: var(--text-3); font-weight: 500; letter-spacing: 0.02em; text-transform: uppercase; }
.sp-char-body { margin: 8px 0 12px; font-size: 13px; color: var(--text-2); line-height: 1.5; }
.sp-char-quote {
  margin: 0;
  padding: 10px 12px;
  background: var(--surface-2);
  border-radius: 12px;
  font-size: 12.5px;
  font-style: italic;
  color: var(--text-2);
  line-height: 1.45;
  position: relative;
  width: 100%;
}
.sp-char-quote::before {
  content: "";
  position: absolute;
  top: -6px; left: 16px;
  width: 12px; height: 12px;
  background: var(--surface-2);
  transform: rotate(45deg);
  border-radius: 2px;
}
.sp-char-badge {
  position: absolute;
  top: 14px; right: 14px;
  font-size: 10px; font-weight: 600;
  letter-spacing: 0.06em; text-transform: uppercase;
  padding: 3px 8px; border-radius: 999px;
}
.sp-char-badge.is-free { background: oklch(0.96 0.04 158); color: oklch(0.42 0.11 158); }
.sp-char-badge.is-pro { background: var(--spark-violet-soft); color: var(--spark-violet-ink); }

/* ============ Pricing ============ */
.sp-price {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  max-width: 840px;
  margin: 0 auto;
}
@media (min-width: 769px) { .sp-price { grid-template-columns: 1fr 1fr; gap: 18px; } }

.sp-tier {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 24px 22px;
  display: flex; flex-direction: column;
  gap: 18px;
}
@media (min-width: 769px) { .sp-tier { padding: 28px 26px; } }
.sp-tier.is-pro {
  background:
    radial-gradient(120% 90% at 100% 0%, oklch(0.97 0.03 295) 0%, transparent 55%),
    radial-gradient(80% 80% at 0% 100%, oklch(0.97 0.03 50) 0%, transparent 60%),
    var(--surface);
  border: 2px solid var(--spark-violet);
  padding: 23px 21px;
}
@media (min-width: 769px) { .sp-tier.is-pro { padding: 27px 25px; } }

.sp-tier-head {
  display: flex; align-items: flex-start; justify-content: space-between;
  gap: 12px;
}
.sp-tier-name { margin: 0; font-size: 17px; font-weight: 600; letter-spacing: -0.018em; }
.sp-tier-tagline { margin: 4px 0 0; font-size: 13px; color: var(--text-3); line-height: 1.4; }
.sp-tier-badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 4px 10px;
  background: var(--spark-grad);
  color: white;
  border-radius: 999px;
  font-size: 11px; font-weight: 600;
  letter-spacing: 0.02em; text-transform: uppercase;
  flex-shrink: 0;
}

.sp-tier-price {
  display: flex; align-items: baseline; gap: 6px;
  letter-spacing: -0.028em;
}
.sp-tier-price-num {
  font-size: 36px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  line-height: 1;
}
@media (min-width: 769px) { .sp-tier-price-num { font-size: 42px; } }
.sp-tier-price-unit { font-size: 14px; color: var(--text-3); font-weight: 500; }
.sp-tier-price-aux { font-size: 12.5px; color: var(--text-3); margin-top: 4px; }
.sp-tier.is-pro .sp-tier-price-num {
  background: var(--spark-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.sp-tier-feats { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.sp-tier-feat {
  display: flex; gap: 10px;
  align-items: flex-start;
  font-size: 13.5px;
  color: var(--text);
  line-height: 1.45;
}
.sp-tier-feat-icon {
  flex: 0 0 18px;
  width: 18px; height: 18px;
  margin-top: 1px;
  border-radius: 50%;
  background: var(--surface-2);
  color: var(--text-3);
  display: grid; place-items: center;
}
.sp-tier-feat.is-on .sp-tier-feat-icon { background: oklch(0.96 0.04 158); color: oklch(0.42 0.11 158); }
.sp-tier-feat.is-off { color: var(--text-3); }
.sp-tier-feat strong { font-weight: 600; color: var(--text); }
.sp-tier.is-pro .sp-tier-feat.is-on .sp-tier-feat-icon { background: var(--spark-violet-soft); color: var(--spark-violet-ink); }
.sp-tier-cta { margin-top: 4px; }

/* ============ Footer ============ */
.sp-foot {
  border-top: 1px solid var(--border);
  background: var(--surface);
  padding: 32px 0 28px;
}
@media (min-width: 769px) { .sp-foot { padding: 48px 0 36px; } }

.sp-foot-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
@media (min-width: 769px) { .sp-foot-grid { grid-template-columns: 1.5fr 1fr 1fr; gap: 36px; } }

.sp-foot-tag { font-size: 13px; color: var(--text-3); line-height: 1.5; margin: 12px 0 0; max-width: 36ch; }
.sp-foot-col-title {
  margin: 0 0 12px;
  font-size: 11px; font-weight: 600;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--text-3);
}
.sp-foot-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.sp-foot-list a { color: var(--text-2); text-decoration: none; font-size: 13.5px; }
.sp-foot-list a:hover { color: var(--text); }

.sp-foot-bot {
  margin-top: 24px; padding-top: 18px;
  border-top: 1px solid var(--border);
  display: flex; justify-content: space-between; align-items: center;
  gap: 12px; flex-wrap: wrap;
  font-size: 12px; color: var(--text-3);
}