/* ============================================================
   Panda Talk — landing styles
   Self-contained. Zero external requests. System font stack only.
   ============================================================ */

:root{
  --bg:        #0a0d13;
  --bg-2:      #0d1016;
  --surface:   #141922;
  --surface-2: #1b212c;
  --line:      #232b38;
  --line-soft: #1c232f;
  --text:      #eef2f7;
  --text-dim:  #aab3c2;
  --text-mute: #76808f;
  --accent:    #3ddc84;
  --accent-2:  #2bb673;
  --accent-ink:#062014;
  --shadow:    0 24px 60px -24px rgba(0,0,0,.7);
  --shadow-sm: 0 10px 30px -16px rgba(0,0,0,.6);
  --radius:    20px;
  --radius-sm: 12px;
  --maxw:      1140px;
  --ease:      cubic-bezier(.22,.61,.36,1);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Ubuntu,
          "Helvetica Neue", Arial, "Noto Sans", sans-serif;
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; -webkit-text-size-adjust:100%; }
body{
  margin:0;
  font-family:var(--font);
  color:var(--text);
  background:var(--bg);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img,svg{ display:block; max-width:100%; }
a{ color:inherit; text-decoration:none; }
h1,h2,h3{ line-height:1.15; margin:0; letter-spacing:-.02em; font-weight:750; }
p{ margin:0; }
button{ font-family:inherit; cursor:pointer; }

.container{ width:100%; max-width:var(--maxw); margin:0 auto; padding:0 22px; }
.accent{ color:var(--accent); }

/* focus a11y */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:3px;
  border-radius:8px;
}

/* ---------- icons ---------- */
.ico{ width:24px; height:24px; }
.ico-xs{ width:18px; height:18px; flex:0 0 auto; }

/* ---------- buttons ---------- */
.btn{
  --bh:46px;
  display:inline-flex; align-items:center; gap:10px;
  padding:0 18px; min-height:var(--bh);
  border:1px solid transparent; border-radius:999px;
  font-weight:650; font-size:15px; color:var(--text);
  background:var(--surface-2);
  transition:transform .25s var(--ease), box-shadow .25s var(--ease),
             background .25s var(--ease), border-color .25s var(--ease);
}
.btn:hover{ transform:translateY(-2px); }
.btn:active{ transform:translateY(0); }
.btn-sm{ --bh:40px; padding:0 16px; font-size:14px; }
.btn-lg{ --bh:62px; padding:0 24px; font-size:16px; border-radius:18px; }
.btn-block{ width:100%; justify-content:center; }

.btn-accent{
  background:linear-gradient(135deg, var(--accent), var(--accent-2));
  color:var(--accent-ink);
  box-shadow:0 14px 34px -14px rgba(61,220,132,.7);
}
.btn-accent:hover{ box-shadow:0 20px 44px -14px rgba(61,220,132,.85); }

.btn-ghost{
  background:transparent;
  border-color:var(--line);
  color:var(--text-dim);
}
.btn-ghost:hover{ border-color:#33414f; color:var(--text); }

.btn.is-disabled, .btn[disabled]{
  opacity:.55; cursor:not-allowed;
}
.btn.is-disabled:hover{ transform:none; box-shadow:none; }

.btn-stack{ display:flex; flex-direction:column; align-items:flex-start; line-height:1.1; }
.btn-stack b{ font-size:1.02em; }
.btn-stack small{ font-size:.72em; opacity:.85; font-weight:600; }
.btn-download .ico-dl{ width:20px; height:20px; margin-left:4px; opacity:.85; }
.btn-download .dot{ opacity:.5; margin:0 2px; }

/* ---------- header ---------- */
.site-header{
  position:sticky; top:0; z-index:50;
  background:rgba(10,13,19,.72);
  backdrop-filter:saturate(140%) blur(14px);
  border-bottom:1px solid var(--line-soft);
}
.nav{ display:flex; align-items:center; gap:20px; height:68px; }
.brand{ display:flex; align-items:center; gap:11px; }
.brand-logo{ width:38px; height:38px; border-radius:11px; }
.brand-logo.sm{ width:32px; height:32px; }
.brand-name{ font-weight:700; font-size:18px; letter-spacing:-.02em; }
.brand-name b{ color:var(--accent); font-weight:800; }
.nav-links{ display:flex; gap:26px; margin-left:auto; }
.nav-links a{ color:var(--text-dim); font-size:15px; font-weight:550; transition:color .2s; }
.nav-links a:hover{ color:var(--text); }
.nav-actions{ display:flex; align-items:center; gap:12px; margin-left:18px; }
.lang-toggle{
  background:transparent; border:1px solid var(--line); color:var(--text-dim);
  border-radius:999px; padding:7px 12px; font-size:12.5px; font-weight:650; letter-spacing:.02em;
  transition:border-color .2s, color .2s;
}
.lang-toggle:hover{ color:var(--text); border-color:#33414f; }

/* ---------- hero ---------- */
.hero{ position:relative; padding:70px 0 80px; overflow:hidden; }
.hero-glow{
  position:absolute; inset:-30% 0 auto 0; height:680px; z-index:0; pointer-events:none;
  background:
    radial-gradient(60% 55% at 18% 12%, rgba(61,220,132,.16), transparent 60%),
    radial-gradient(50% 50% at 88% 4%, rgba(46,121,255,.10), transparent 60%);
  filter:blur(6px);
}
.hero-grid{
  position:relative; z-index:1;
  display:grid; grid-template-columns:1.08fr .92fr; gap:54px; align-items:center;
}
.eyebrow{
  display:inline-flex; align-items:center; gap:8px;
  background:rgba(61,220,132,.1); color:var(--accent);
  border:1px solid rgba(61,220,132,.25);
  padding:7px 14px; border-radius:999px; font-size:13px; font-weight:650;
  margin-bottom:22px;
}
.hero h1{ font-size:clamp(34px, 5vw, 56px); font-weight:800; }
.lead{ color:var(--text-dim); font-size:clamp(16px,1.6vw,19px); margin:22px 0 30px; max-width:34em; }
.hero-cta{ display:flex; flex-wrap:wrap; gap:14px; }
.hero-trust{
  list-style:none; padding:0; margin:30px 0 0;
  display:flex; flex-wrap:wrap; gap:10px 22px;
}
.hero-trust li{ display:flex; align-items:center; gap:8px; color:var(--text-dim); font-size:14.5px; }
.hero-trust .ico-xs{ color:var(--accent); }

/* ---------- phone mockup ---------- */
.hero-device{ position:relative; display:flex; justify-content:center; }
.phone{
  position:relative; width:300px; max-width:84vw; aspect-ratio:300/620;
  background:linear-gradient(160deg,#222a36,#10141c);
  border-radius:42px; padding:12px;
  border:1px solid #2c3543;
  box-shadow:var(--shadow), inset 0 1px 0 rgba(255,255,255,.05);
  animation:floaty 6s ease-in-out infinite;
}
@keyframes floaty{ 0%,100%{ transform:translateY(0) } 50%{ transform:translateY(-12px) } }
.phone-notch{
  position:absolute; top:18px; left:50%; transform:translateX(-50%);
  width:120px; height:22px; background:#0a0d13; border-radius:0 0 14px 14px; z-index:3;
}
.phone-screen{
  height:100%; background:linear-gradient(180deg,#0c1017,#0a0d13);
  border-radius:32px; overflow:hidden; display:flex; flex-direction:column;
  border:1px solid #1a2230;
}
.chat-top{
  display:flex; align-items:center; gap:10px; padding:34px 14px 12px;
  background:linear-gradient(180deg, rgba(61,220,132,.07), transparent);
  border-bottom:1px solid var(--line-soft);
}
.chat-avatar{ width:34px; height:34px; border-radius:10px; }
.chat-meta{ display:flex; flex-direction:column; line-height:1.2; }
.chat-name{ font-size:14px; font-weight:700; }
.chat-status{ font-size:11px; color:var(--text-mute); display:flex; align-items:center; gap:5px; }
.online-dot{ width:7px; height:7px; border-radius:50%; background:var(--accent); box-shadow:0 0 8px var(--accent); }
.chat-lock{ width:18px; height:18px; margin-left:auto; color:var(--accent); }
.chat-body{ flex:1; padding:14px 12px; display:flex; flex-direction:column; gap:9px; overflow:hidden; }
.bubble{
  max-width:80%; padding:9px 12px; border-radius:16px; font-size:12.5px; line-height:1.4;
  position:relative; opacity:0; transform:translateY(8px);
  animation:bubbleIn .5s var(--ease) forwards;
}
.bubble time{ display:block; font-size:9.5px; color:rgba(255,255,255,.45); margin-top:3px; text-align:right; }
.bubble time .rr{ width:11px; height:11px; display:inline-block; vertical-align:-1px; color:var(--accent); }
.bubble.in{ align-self:flex-start; background:var(--surface-2); border-bottom-left-radius:5px; }
.bubble.out{ align-self:flex-end; background:linear-gradient(135deg,var(--accent),var(--accent-2)); color:var(--accent-ink); border-bottom-right-radius:5px; }
.bubble.out time{ color:rgba(6,32,20,.55); }
.bubble.out time .rr{ color:var(--accent-ink); }
.bubble:nth-child(1){ animation-delay:.2s }
.bubble:nth-child(2){ animation-delay:.7s }
.bubble:nth-child(3){ animation-delay:1.2s }
.bubble:nth-child(4){ animation-delay:1.7s }
@keyframes bubbleIn{ to{ opacity:1; transform:translateY(0) } }
.typing{ align-self:flex-start; display:flex; gap:4px; padding:10px 12px; background:var(--surface-2); border-radius:16px; border-bottom-left-radius:5px; opacity:0; animation:bubbleIn .4s 2.2s forwards; }
.typing i{ width:6px; height:6px; border-radius:50%; background:var(--text-mute); animation:blink 1.2s infinite; }
.typing i:nth-child(2){ animation-delay:.2s } .typing i:nth-child(3){ animation-delay:.4s }
@keyframes blink{ 0%,60%,100%{ opacity:.3; transform:translateY(0) } 30%{ opacity:1; transform:translateY(-3px) } }
.chat-input{
  display:flex; align-items:center; gap:8px; padding:10px 12px;
  border-top:1px solid var(--line-soft); background:var(--bg-2);
}
.chat-input-field{ flex:1; font-size:12px; color:var(--text-mute); background:var(--surface); padding:8px 12px; border-radius:999px; }
.chat-send{ display:grid; place-items:center; width:32px; height:32px; border-radius:50%; background:linear-gradient(135deg,var(--accent),var(--accent-2)); color:var(--accent-ink); }
.device-badge{
  position:absolute; bottom:30px; left:-14px;
  display:flex; align-items:center; gap:7px;
  background:var(--surface); border:1px solid var(--line);
  padding:9px 13px; border-radius:14px; font-size:12.5px; font-weight:650;
  box-shadow:var(--shadow-sm); color:var(--text);
  animation:floaty 6s ease-in-out infinite reverse;
}
.device-badge .ico-xs{ color:var(--accent); }

/* ---------- sections ---------- */
.section{ padding:88px 0; }
.section-alt{ background:linear-gradient(180deg, var(--bg-2), var(--bg)); border-top:1px solid var(--line-soft); border-bottom:1px solid var(--line-soft); }
.section-head{ max-width:660px; margin:0 auto 50px; text-align:center; }
.kicker{ display:inline-block; color:var(--accent); font-weight:700; font-size:13px; letter-spacing:.12em; text-transform:uppercase; margin-bottom:14px; }
.section-head h2, .how-copy h2, .contact-intro h2{ font-size:clamp(26px,3.2vw,38px); }
.section-sub{ color:var(--text-dim); font-size:17px; margin-top:16px; }

/* ---------- features ---------- */
.features-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:22px; }
.card{
  background:linear-gradient(180deg, var(--surface), var(--bg-2));
  border:1px solid var(--line); border-radius:var(--radius);
  padding:28px 24px; transition:transform .3s var(--ease), border-color .3s var(--ease), box-shadow .3s var(--ease);
}
.card:hover{ transform:translateY(-5px); border-color:#2f3a48; box-shadow:var(--shadow-sm); }
.card-ico{
  display:inline-grid; place-items:center; width:52px; height:52px; border-radius:15px;
  background:rgba(61,220,132,.1); color:var(--accent);
  border:1px solid rgba(61,220,132,.22); margin-bottom:18px;
}
.card-ico svg{ width:26px; height:26px; }
.card h3{ font-size:18.5px; margin-bottom:9px; }
.card p{ color:var(--text-dim); font-size:15px; }

/* ---------- how it works ---------- */
.how-grid{ display:grid; grid-template-columns:1.1fr .9fr; gap:60px; align-items:center; }
.how-copy .section-sub{ margin-bottom:34px; }
.steps{ display:flex; flex-direction:column; gap:22px; }
.step{ display:flex; gap:16px; }
.step-ico{
  flex:0 0 auto; display:grid; place-items:center; width:46px; height:46px; border-radius:13px;
  background:rgba(61,220,132,.1); color:var(--accent); border:1px solid rgba(61,220,132,.22);
}
.step-ico svg{ width:24px; height:24px; }
.step h3{ font-size:17px; margin-bottom:5px; }
.step p{ color:var(--text-dim); font-size:14.5px; }

.how-visual{ position:relative; display:grid; gap:16px; }
.layer-card{
  display:grid; grid-template-columns:auto 1fr; column-gap:14px; row-gap:1px; align-items:center;
  background:linear-gradient(160deg, var(--surface), var(--bg-2));
  border:1px solid var(--line); border-radius:var(--radius); padding:20px 22px;
  box-shadow:var(--shadow-sm);
}
.layer-card .ico{ grid-row:span 2; width:30px; height:30px; }
.layer-card b{ font-size:16px; }
.layer-card small{ color:var(--text-dim); font-size:13.5px; }
.layer-1{ color:var(--text-mute); margin-right:36px; }
.layer-2{ color:var(--text); border-color:#2e3a47; margin-left:18px; }
.layer-3{ color:var(--accent); border-color:rgba(61,220,132,.35); margin-left:40px; background:linear-gradient(160deg, rgba(61,220,132,.08), var(--bg-2)); }
.layer-card b, .layer-card small{ color:var(--text); }
.layer-3 b{ color:var(--accent); }

/* ---------- cta strip ---------- */
.cta-strip{ padding:70px 0; }
.cta-inner{
  display:flex; align-items:center; gap:28px; flex-wrap:wrap;
  background:
    radial-gradient(120% 140% at 0% 0%, rgba(61,220,132,.12), transparent 55%),
    linear-gradient(160deg, var(--surface), var(--bg-2));
  border:1px solid var(--line); border-radius:28px; padding:38px 40px;
  box-shadow:var(--shadow);
}
.cta-logo{ width:72px; height:72px; border-radius:20px; flex:0 0 auto; }
.cta-text{ flex:1; min-width:240px; }
.cta-text h2{ font-size:clamp(22px,2.6vw,30px); }
.cta-text p{ color:var(--text-dim); margin-top:8px; }
.cta-buttons{ display:flex; gap:12px; flex-wrap:wrap; }

/* ---------- forms ---------- */
.contact-grid{ display:grid; grid-template-columns:1.05fr .95fr; gap:48px; align-items:start; }
.contact-intro .section-sub{ margin-bottom:28px; }
.form{ display:flex; flex-direction:column; gap:16px; margin-top:8px; }
.field{ position:relative; }
.field input, .field textarea{
  width:100%; background:var(--surface); color:var(--text);
  border:1px solid var(--line); border-radius:var(--radius-sm);
  padding:18px 14px 8px; font-size:15px; font-family:inherit; resize:vertical;
  transition:border-color .2s, background .2s;
}
.field textarea{ min-height:112px; }
.field input:focus, .field textarea:focus{ border-color:var(--accent); background:var(--bg-2); outline:none; }
.field label{
  position:absolute; left:15px; top:14px; color:var(--text-mute); font-size:15px;
  pointer-events:none; transition:.18s var(--ease); background:transparent; padding:0 3px;
}
.field input:focus + label, .field input:not(:placeholder-shown) + label,
.field textarea:focus + label, .field textarea:not(:placeholder-shown) + label{
  top:-9px; left:11px; font-size:11.5px; color:var(--accent); background:var(--surface);
}
.field-inline{ display:flex; gap:10px; align-items:stretch; }
.field-inline input{ flex:1; }
.field-inline .btn{ white-space:nowrap; align-self:stretch; }
.form-status{ font-size:14px; min-height:1.2em; color:var(--accent); font-weight:600; }
.form-status.error{ color:#ff7a7a; }

.contact-side{ display:flex; flex-direction:column; gap:24px; }
.news-card{
  background:linear-gradient(160deg, var(--surface), var(--bg-2));
  border:1px solid var(--line); border-radius:var(--radius); padding:28px 26px;
}
.news-card .card-ico{ margin-bottom:14px; }
.news-card h3{ font-size:19px; margin-bottom:8px; }
.news-card p{ color:var(--text-dim); font-size:14.5px; margin-bottom:18px; }
.news-card .field label{ background:var(--surface); }
.news-card .field input:focus + label, .news-card .field input:not(:placeholder-shown) + label{ background:var(--surface); }
.contact-meta{ display:flex; flex-direction:column; gap:8px; padding:0 4px; }
.contact-meta p{ display:flex; align-items:center; gap:9px; color:var(--text-dim); font-size:14.5px; }
.contact-meta a:hover{ color:var(--accent); }
.contact-meta .ico-xs{ color:var(--accent); }

/* ---------- footer ---------- */
.site-footer{ border-top:1px solid var(--line-soft); background:var(--bg-2); padding:46px 0 28px; }
.footer-grid{ display:flex; flex-wrap:wrap; gap:28px; align-items:center; justify-content:space-between; }
.footer-tag{ color:var(--text-mute); font-size:14px; margin-top:10px; }
.footer-links{ display:flex; flex-wrap:wrap; gap:22px; }
.footer-links a{ color:var(--text-dim); font-size:14.5px; transition:color .2s; }
.footer-links a:hover{ color:var(--text); }
.footer-social{ display:flex; gap:10px; }
.soc{
  display:grid; place-items:center; width:40px; height:40px; border-radius:12px;
  background:var(--surface); border:1px solid var(--line); color:var(--text-dim);
  transition:color .2s, border-color .2s, transform .2s;
}
.soc:hover{ color:var(--accent); border-color:rgba(61,220,132,.4); transform:translateY(-2px); }
.footer-bottom{
  display:flex; flex-wrap:wrap; gap:10px; justify-content:space-between;
  margin-top:30px; padding-top:22px; border-top:1px solid var(--line-soft);
  color:var(--text-mute); font-size:13.5px;
}

/* ---------- scroll reveal ---------- */
.reveal{ opacity:0; transform:translateY(26px); transition:opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.is-visible{ opacity:1; transform:none; }

/* ---------- responsive ---------- */
@media (max-width:980px){
  .hero-grid{ grid-template-columns:1fr; gap:44px; }
  .hero-device{ order:-1; }
  .how-grid{ grid-template-columns:1fr; gap:40px; }
  .contact-grid{ grid-template-columns:1fr; gap:34px; }
  .features-grid{ grid-template-columns:repeat(2,1fr); }
  .nav-links{ display:none; }
}
@media (max-width:620px){
  .section{ padding:64px 0; }
  .hero{ padding:46px 0 60px; }
  .features-grid{ grid-template-columns:1fr; }
  .cta-inner{ padding:28px 24px; text-align:center; justify-content:center; }
  .cta-text{ text-align:center; }
  .cta-buttons{ width:100%; justify-content:center; }
  .hero-cta .btn, .cta-buttons .btn{ flex:1 1 auto; justify-content:center; }
  .field-inline{ flex-direction:column; }
  .footer-grid{ flex-direction:column; align-items:flex-start; }
  .layer-1,.layer-2,.layer-3{ margin:0; }
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion:reduce){
  *{ animation:none !important; transition:none !important; scroll-behavior:auto; }
  .reveal{ opacity:1; transform:none; }
}