:root {
  color-scheme: light dark;
  --grad: linear-gradient(135deg, #ff5a8a 0%, #c04dff 100%);
  --accent: #e0457b;
  --bg: #ffffff;
  --page: #eef0f4;
  --surface: #ffffff;
  --them: #f0f1f4;
  --text: #121216;
  --muted: #8b8e98;
  --line: rgba(0, 0, 0, 0.07);
  --online: #31c46b;
  --field: #f0f1f4;
  --shadow: 0 0 0 1px rgba(0, 0, 0, 0.04), 0 18px 60px rgba(30, 20, 60, 0.12);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16161a;
    --page: #0b0b0d;
    --surface: #16161a;
    --them: #2a2a31;
    --text: #f2f2f5;
    --muted: #8f919c;
    --line: rgba(255, 255, 255, 0.08);
    --field: #26262c;
    --shadow: 0 0 0 1px rgba(255, 255, 255, 0.05);
  }
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html, body {
  margin: 0;
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--page);
  -webkit-font-smoothing: antialiased;
}

button { font: inherit; color: inherit; }

.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
  max-width: 480px;
  margin: 0 auto;
  background: var(--bg);
  overflow: hidden;
}

@media (min-width: 560px) {
  body { display: grid; place-items: center; padding: 24px; }
  .app { height: min(860px, calc(100dvh - 48px)); width: 100%; border-radius: 28px; box-shadow: var(--shadow); }
}

/* ---------- ikony ---------- */
.icon-btn {
  flex: none;
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: none;
  cursor: pointer;
  color: var(--accent);
}
.icon-btn:active { background: var(--line); }
.icon-btn svg {
  width: 24px;
  height: 24px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.9;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ---------- awatary ---------- */
.avatar {
  position: relative;
  flex: none;
  border-radius: 50%;
  background: #ccc center / cover no-repeat;
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 700;
}
.avatar.sm { width: 40px; height: 40px; font-size: 17px; }
.avatar.xs { width: 28px; height: 28px; font-size: 12px; }
.avatar.xl { width: 96px; height: 96px; font-size: 38px; }
.avatar.online::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--online);
  border: 2.5px solid var(--surface);
}

/* ---------- nagłówek ---------- */
.chat-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 8px 8px 4px;
  padding-top: max(8px, env(safe-area-inset-top));
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  z-index: 2;
}
.back svg { stroke-width: 2.4; }
.who { flex: 1; min-width: 0; margin-left: 2px; }
.name { font-weight: 650; font-size: 16.5px; line-height: 1.2; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.status { font-size: 12.5px; color: var(--muted); transition: color 0.2s; }
.status.typing { color: var(--accent); }
.header-actions { display: flex; }

/* ---------- lista wiadomości ---------- */
.messages {
  flex: 1;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 8px 12px 10px;
  display: flex;
  flex-direction: column;
  -webkit-overflow-scrolling: touch;
  /* cienki, dyskretny pasek – widoczny dopiero po najechaniu myszką */
  scrollbar-width: thin;
  scrollbar-color: transparent transparent;
  transition: scrollbar-color 0.3s;
}
.messages:hover { scrollbar-color: rgba(140, 140, 150, 0.45) transparent; }
.messages::-webkit-scrollbar { width: 6px; }
.messages::-webkit-scrollbar-track { background: transparent; }
.messages::-webkit-scrollbar-thumb { background: transparent; border-radius: 3px; }
.messages:hover::-webkit-scrollbar-thumb { background: rgba(140, 140, 150, 0.45); }

.intro {
  text-align: center;
  padding: 26px 16px 18px;
}
.intro .avatar { margin: 0 auto 12px; box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12); }
.intro h1 { margin: 0; font-size: 21px; font-weight: 700; }
.intro-sub { margin: 6px 0 2px; font-size: 14.5px; }
.intro-meta { margin: 0; font-size: 12.5px; color: var(--muted); }

.time-sep {
  text-align: center;
  font-size: 11.5px;
  font-weight: 500;
  color: var(--muted);
  margin: 6px 0 12px;
}

.msg {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  margin-top: 2px;
  animation: pop 0.22s cubic-bezier(0.2, 0.9, 0.3, 1.2);
}
.me + .them, .them + .me, .seen + .msg { margin-top: 12px; }
.msg.me { justify-content: flex-end; }
.msg.them .avatar { visibility: hidden; }
.msg.them.last .avatar { visibility: visible; }

.bubble {
  position: relative;
  max-width: 74%;
  padding: 8px 12px;
  border-radius: 20px;
  font-size: 15.5px;
  line-height: 1.36;
  overflow-wrap: anywhere;
  white-space: pre-wrap;
}
.them .bubble { background: var(--them); color: var(--text); }
.me .bubble { background: var(--grad); color: #fff; }

/* zaokrąglenia w grupach, jak w komunikatorach */
.them:not(.last) .bubble { border-bottom-left-radius: 6px; }
.them + .them .bubble { border-top-left-radius: 6px; }
.me:has(+ .me) .bubble { border-bottom-right-radius: 6px; }
.me + .me .bubble { border-top-right-radius: 6px; }

.meta {
  float: right;
  display: inline-flex;
  align-items: center;
  gap: 3px;
  margin: 7px -3px -3px 10px;
  font-size: 10.5px;
  line-height: 1;
  opacity: 0.7;
}
.them .meta { color: var(--muted); opacity: 1; }
.ticks { font-size: 11px; letter-spacing: -4px; padding-right: 4px; transition: color 0.3s; }
.ticks.read { color: #fff; opacity: 1; font-weight: 700; }
.me .meta:has(.read) { opacity: 1; }

.seen {
  align-self: flex-end;
  display: flex;
  align-items: center;
  gap: 5px;
  margin: 4px 2px 0 0;
  font-size: 11.5px;
  color: var(--muted);
  animation: fade 0.3s ease-out;
}
.seen .avatar { width: 15px; height: 15px; font-size: 7px; }

/* "pisze..." */
.typing .bubble { display: flex; gap: 4px; padding: 13px 15px; }
.typing i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--muted);
  animation: blink 1.3s infinite ease-in-out;
}
.typing i:nth-child(2) { animation-delay: 0.18s; }
.typing i:nth-child(3) { animation-delay: 0.36s; }

@keyframes blink { 0%, 60%, 100% { opacity: 0.35; transform: translateY(0); } 30% { opacity: 1; transform: translateY(-3px); } }
@keyframes pop { from { opacity: 0; transform: translateY(8px) scale(0.97); } to { opacity: 1; transform: none; } }
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }

/* ---------- dół: pole wpisywania / przycisk ---------- */
.bottom {
  background: var(--surface);
  border-top: 1px solid var(--line);
  padding-bottom: env(safe-area-inset-bottom);
}

.composer {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 8px 8px 8px 4px;
}

.field {
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
  margin-left: 4px;
  background: var(--field);
  border-radius: 22px;
}
.field input {
  flex: 1;
  min-width: 0;
  border: 0;
  outline: 0;
  background: none;
  padding: 10px 4px 10px 15px;
  font: inherit;
  font-size: 16px; /* 16px = brak auto-zoomu na iOS */
  color: var(--text);
}
.field input::placeholder { color: var(--muted); }
.icon-btn.emoji { width: 36px; height: 36px; }

.send {
  flex: none;
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  margin-left: 4px;
  border: 0;
  border-radius: 50%;
  background: var(--grad);
  color: #fff;
  cursor: pointer;
  transition: transform 0.15s, opacity 0.2s;
}
.send svg { width: 20px; height: 20px; fill: currentColor; margin-left: 2px; }
.send:active { transform: scale(0.9); }
.send:disabled { opacity: 0.35; cursor: default; }

.cta {
  padding: 12px 16px 14px;
  text-align: center;
  animation: rise 0.35s cubic-bezier(0.2, 0.9, 0.3, 1.1);
}
.cta[hidden], .composer[hidden] { display: none; }
.cta-info { margin: 0 0 10px; font-size: 14px; color: var(--muted); }
.cta-btn {
  display: block;
  padding: 15px 20px;
  border-radius: 16px;
  background: var(--grad);
  color: #fff;
  font-weight: 650;
  font-size: 16.5px;
  text-decoration: none;
  box-shadow: 0 8px 24px rgba(224, 69, 123, 0.35);
  animation: pulse 2s 0.6s infinite;
}
.cta-btn:active { transform: scale(0.98); }

@keyframes rise { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: none; } }
@keyframes pulse { 0%, 100% { box-shadow: 0 8px 24px rgba(224, 69, 123, 0.35); } 50% { box-shadow: 0 8px 34px rgba(224, 69, 123, 0.6); } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

/* ---------- okienko "funkcja w głównej wersji" ---------- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 10;
  display: grid;
  place-items: end center;
  padding: 16px;
  padding-bottom: max(16px, env(safe-area-inset-bottom));
  background: rgba(10, 10, 20, 0.45);
  -webkit-backdrop-filter: blur(3px);
  backdrop-filter: blur(3px);
  animation: fade 0.2s ease-out;
}
.modal[hidden] { display: none; }
@media (min-width: 560px) { .modal { place-items: center; } }

.modal-card {
  width: 100%;
  max-width: 400px;
  padding: 26px 20px 12px;
  border-radius: 24px;
  background: var(--surface);
  text-align: center;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  animation: rise 0.3s cubic-bezier(0.2, 0.9, 0.3, 1.1);
}
.modal-icon {
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  margin: 0 auto 14px;
  border-radius: 50%;
  background: var(--grad);
  color: #fff;
}
.modal-icon svg { width: 26px; height: 26px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; }
.modal-card h2 { margin: 0 0 6px; font-size: 19px; }
.modal-card p { margin: 0 0 20px; font-size: 15px; line-height: 1.45; color: var(--muted); }
.modal-card .cta-btn { animation: none; }
.modal-close {
  width: 100%;
  margin-top: 6px;
  padding: 13px;
  border: 0;
  background: none;
  color: var(--muted);
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
}