/* ============================================================
   REALUMA — light/dark design system
   Light board: ivory morning · Dark board: obsidian dusk
   Tokens map 1:1 between themes. --brand = the company speaks,
   --ai = the assistant speaks. Never mix the roles.
   ============================================================ */

:root{
  /* LIGHT THEME (default) */
  --bg:#FBFAF6;
  --bg-alt:#F5F1E8;
  --surface:#FFFFFF;
  --surface-2:#F5F1E8;
  --text:#16333A;
  --text-2:#2F5B63;
  --muted:rgba(22,51,58,.58);
  --brand:#C9A170;
  --brand-ink:#8F6B36;            /* champagne darkened for small text on light */
  --brand-contrast:#16333A;       /* text on champagne fills */
  --ai:#4E8593;
  --ai-strong:#2F5B63;
  --ai-wash:#DDE9EB;
  --sand:#EDE3D2;
  --line:rgba(143,107,54,.30);
  --shadow:0 10px 34px rgba(22,51,58,.10);
  --danger:#B0574C;

  /* hero scene — MORNING */
  --sky-top:#EAF3F4; --sky-bottom:#F8F3E7;
  --sea-top:#9FC6CC; --sea-bottom:#6FA7B1;
  --celestial:#F3D9A4; --celestial-glow:rgba(243,217,164,.55);
  --skyline:rgba(22,51,58,.16);
  --palm:#3E6B62; --terrace:#EDE3D2;
  --glint:rgba(255,255,255,.55);

  /* social-channel accents — evocative, deliberately NOT the platforms'
     exact brand colors. The only sanctioned hardcoded hexes outside tokens. */
  --ch-messenger:#1E88E5;
  --ch-zalo:#1A94E0;
  --ch-whatsapp:#25806B;
  --ch-telegram:#3AA0D8;

  --display:'Marcellus',serif;
  --body:'Albert Sans','Noto Sans KR','Noto Sans SC','Malgun Gothic','Microsoft YaHei',sans-serif;
  --mono:'IBM Plex Mono',monospace;
}

[data-theme="dark"]{
  --bg:#0E1518;
  --bg-alt:#101A1E;
  --surface:#17282E;
  --surface-2:#132126;
  --text:#F0EBDF;
  --text-2:#9DB4B8;
  --muted:rgba(240,235,223,.55);
  --brand:#C9A170;
  --brand-ink:#C9A170;
  --brand-contrast:#0E1518;
  --ai:#5FA0AE;
  --ai-strong:#5FA0AE;
  --ai-wash:#1E3A40;
  --sand:#1B2A2F;
  --line:rgba(201,161,112,.26);
  --shadow:0 12px 40px rgba(0,0,0,.45);

  /* hero scene — DUSK */
  --sky-top:#0C1524; --sky-bottom:#22364A;
  --sea-top:#16333E; --sea-bottom:#0D2128;
  --celestial:#EFE6CE; --celestial-glow:rgba(239,230,206,.28);
  --skyline:rgba(240,235,223,.20);
  --palm:#0A1A18; --terrace:#101C21;
  --glint:rgba(201,161,112,.35);
}

html[lang="ru"]{ --display:'Playfair Display',serif; }

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--bg);color:var(--text);
  font-family:var(--body);font-size:16px;line-height:1.65;
  transition:background .5s ease,color .5s ease;
}
h1,h2,h3,.wordmark{font-family:var(--display);font-weight:400;line-height:1.12}
h2{font-size:clamp(26px,3.6vw,40px);max-width:760px;margin:14px 0 18px}
a{color:inherit}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}
section{padding:100px 0;border-top:1px solid var(--line)}
.eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.22em;text-transform:uppercase;color:var(--brand-ink)}
.section-lede{max-width:640px;color:var(--muted);font-size:17px}
.section-lede.center{margin:0 auto}

/* ---------- buttons ---------- */
.btn{display:inline-block;padding:15px 32px;text-decoration:none;cursor:pointer;
  font-family:var(--mono);font-size:13px;letter-spacing:.12em;text-transform:uppercase;
  border:1px solid var(--brand);transition:transform .18s ease,box-shadow .18s ease,background .18s ease,color .18s ease}
.btn:focus-visible{outline:2px solid var(--ai);outline-offset:3px}
.btn-primary{background:var(--brand);color:var(--brand-contrast);font-weight:500}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 22px rgba(201,161,112,.35)}
.btn-ghost{background:transparent;color:var(--brand-ink)}
.btn-ghost:hover{background:var(--brand);color:var(--brand-contrast)}
.btn-small{padding:9px 18px;font-size:11px}
.btn-large{padding:18px 44px}
.btn-agent{display:inline-flex;align-items:center;gap:7px}

/* ---------- nav ---------- */
nav{position:sticky;top:0;z-index:60;background:color-mix(in srgb,var(--bg) 84%,transparent);
  backdrop-filter:blur(14px);border-bottom:1px solid var(--line);transition:background .5s ease}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:68px;gap:18px}
.wordmark{font-size:20px;letter-spacing:.22em;color:var(--brand-ink);text-decoration:none}
[data-theme="dark"] .wordmark{color:var(--brand)}
.nav-links{display:flex;gap:26px;font-size:14.5px}
.nav-links a{text-decoration:none;color:var(--text-2);transition:color .15s}
.nav-links a:hover{color:var(--brand-ink)}
.nav-controls{display:flex;align-items:center;gap:14px}
.langs{display:flex;border:1px solid var(--line)}
.langs button{background:none;border:none;color:var(--muted);font-family:var(--mono);font-size:11px;
  padding:7px 11px;cursor:pointer;letter-spacing:.1em;transition:background .15s,color .15s}
.langs button[aria-pressed="true"]{background:var(--brand);color:var(--brand-contrast)}
#theme-toggle{background:none;border:1px solid var(--line);color:var(--text-2);width:36px;height:34px;
  display:grid;place-items:center;cursor:pointer;transition:color .2s,border-color .2s}
#theme-toggle:hover{color:var(--brand-ink);border-color:var(--brand)}
[data-theme="light"] .icon-moon{display:none}
[data-theme="dark"] .icon-sun{display:none}

/* ---------- door routing (lobby ↔ doors) ----------
   Pre-JS the body has no data-view: lobby shows, doors hidden — no flash. */
.door{display:none}
body[data-view="real-estate"] [data-door="real-estate"],
body[data-view="tours"] [data-door="tours"],
body[data-view="business"] [data-door="business"]{display:block}
body[data-view="real-estate"] .lobby,
body[data-view="tours"] .lobby,
body[data-view="business"] .lobby{display:none}

/* ---------- lobby ---------- */
.lobby{position:relative;min-height:calc(100svh - 68px);display:grid;align-items:center;
  overflow:hidden;padding:72px 0;border-top:none}
.lobby-scene{position:absolute;inset:0;
  background:linear-gradient(180deg,var(--sky-top),var(--bg) 82%);transition:background 1s ease}
/* faint stars, dusk only */
.lobby-scene::after{content:"";position:absolute;inset:0;opacity:0;transition:opacity 1s ease;
  background-image:
    radial-gradient(1.3px 1.3px at 11% 18%,var(--celestial) 50%,transparent 51%),
    radial-gradient(1px 1px at 27% 9%,var(--celestial) 50%,transparent 51%),
    radial-gradient(1.4px 1.4px at 41% 22%,var(--celestial) 50%,transparent 51%),
    radial-gradient(1px 1px at 56% 7%,var(--celestial) 50%,transparent 51%),
    radial-gradient(1.2px 1.2px at 68% 16%,var(--celestial) 50%,transparent 51%),
    radial-gradient(1px 1px at 79% 6%,var(--celestial) 50%,transparent 51%),
    radial-gradient(1.4px 1.4px at 88% 20%,var(--celestial) 50%,transparent 51%),
    radial-gradient(1px 1px at 18% 34%,var(--celestial) 50%,transparent 51%),
    radial-gradient(1px 1px at 63% 30%,var(--celestial) 50%,transparent 51%),
    radial-gradient(1.2px 1.2px at 93% 36%,var(--celestial) 50%,transparent 51%)}
[data-theme="dark"] .lobby-scene::after{opacity:.65}
.lobby-inner{position:relative;text-align:center}
.lobby-mark{font-family:var(--display);font-size:clamp(38px,5.4vw,60px);letter-spacing:.3em;
  margin-right:-.3em;color:var(--brand-ink)}
[data-theme="dark"] .lobby-mark{color:var(--brand)}
.lobby-tag{margin-top:10px;color:var(--muted);font-size:17px}
.lobby-q{margin-top:52px;font-family:var(--mono);font-size:13px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--brand-ink)}
[data-theme="dark"] .lobby-q{color:var(--brand)}
.doors{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin:26px auto 0;max-width:1000px}
.door-card{display:flex;flex-direction:column;align-items:flex-start;text-align:left;gap:12px;
  background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:32px 28px;
  text-decoration:none;box-shadow:var(--shadow);
  transition:transform .22s ease,border-color .22s ease,box-shadow .3s ease,background .5s ease}
.door-card:hover,.door-card:focus-visible{transform:translateY(-6px);border-color:var(--brand)}
.door-card:focus-visible{outline:2px solid var(--ai);outline-offset:3px}
[data-theme="dark"] .door-card{
  box-shadow:0 0 24px color-mix(in srgb,var(--ai) 14%,transparent),var(--shadow)}
[data-theme="dark"] .door-card:hover,[data-theme="dark"] .door-card:focus-visible{
  box-shadow:0 0 30px color-mix(in srgb,var(--ai) 26%,transparent),var(--shadow)}
.door-icon{width:46px;height:46px;color:var(--brand-ink)}
[data-theme="dark"] .door-icon{color:var(--brand)}
.door-icon path,.door-icon circle{stroke-dasharray:100;stroke-dashoffset:0}
.door-card:hover .door-icon path,.door-card:hover .door-icon circle,
.door-card:focus-visible .door-icon path,.door-card:focus-visible .door-icon circle{
  animation:icon-draw .9s ease forwards}
@keyframes icon-draw{from{stroke-dashoffset:100}to{stroke-dashoffset:0}}
.door-card h3{font-size:20px;color:var(--text)}
.door-card p{font-size:14.5px;color:var(--text-2);flex:1}
.door-enter{font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--brand-ink);border:1px solid var(--brand);padding:9px 18px;margin-top:6px;
  transition:background .18s ease,color .18s ease}
[data-theme="dark"] .door-enter{color:var(--brand)}
.door-card:hover .door-enter,.door-card:focus-visible .door-enter{
  background:var(--brand);color:var(--brand-contrast)}
.lobby-line{margin-top:48px;font-family:var(--mono);font-size:12px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--muted)}

/* stub doors (replaced in Stage 3) */
.door-stub{min-height:50vh;display:grid;align-items:center}
.door-stub h2{margin:14px 0 26px}

/* ---------- hero ---------- */
.hero{padding:86px 0 96px;overflow:hidden;position:relative}
.hero-grid{display:grid;grid-template-columns:1.05fr 1fr;gap:56px;align-items:center;position:relative;z-index:1}
.hero h1{font-size:clamp(36px,4.8vw,58px)}
.hero h1 em{font-style:normal;color:var(--brand-ink)}
[data-theme="dark"] .hero h1 em{color:var(--brand)}
.lede{margin:24px 0 34px;max-width:520px;color:var(--muted);font-size:18px}
.hero-ctas{display:flex;gap:14px;flex-wrap:wrap}

/* the living scene */
.hero-scene{position:relative}
/* full-bleed hero photo (Task 1) — shown only for a theme whose file loaded */
.hero-bg{position:absolute;inset:0;z-index:0;display:none;overflow:hidden}
.hero-bg img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;
  object-position:center;display:none}
/* scrim: --bg-based so it adapts per theme (lightens left in light, darkens in dark),
   keeping the left-side headline legible; plus a soft bottom grounding fade */
.hero-bg::after{content:"";position:absolute;inset:0;background:
  linear-gradient(90deg,color-mix(in srgb,var(--bg) 88%,transparent),
    color-mix(in srgb,var(--bg) 45%,transparent) 38%,transparent 66%),
  linear-gradient(0deg,color-mix(in srgb,var(--bg) 55%,transparent),transparent 30%)}
[data-theme="light"] .hero.has-photo-light .hero-bg,
[data-theme="light"] .hero.has-photo-light .hp-light{display:block}
[data-theme="dark"] .hero.has-photo-dark .hero-bg,
[data-theme="dark"] .hero.has-photo-dark .hp-dark{display:block}
[data-theme="light"] .hero.has-photo-light .scene,
[data-theme="dark"] .hero.has-photo-dark .scene{display:none}
[data-theme="light"] .hero.has-photo-light .hero-scene,
[data-theme="dark"] .hero.has-photo-dark .hero-scene{min-height:400px}
.scene{position:relative;height:420px;border:1px solid var(--line);overflow:hidden;
  box-shadow:var(--shadow);border-radius:10px}
.scene>*{position:absolute}
.sky{inset:0;background:linear-gradient(180deg,var(--sky-top),var(--sky-bottom));transition:background 1s ease}
.celestial{width:74px;height:74px;border-radius:50%;background:var(--celestial);
  box-shadow:0 0 70px 26px var(--celestial-glow);right:19%;top:14%;
  transition:background 1s ease,box-shadow 1s ease,top 1s ease}
[data-theme="dark"] .celestial{top:9%;width:58px;height:58px}
.skyline{left:0;right:0;bottom:41%;height:44px;display:flex;align-items:flex-end;gap:5px;padding:0 8%}
.skyline span{flex:1;background:var(--skyline);transition:background 1s ease}
.skyline span:nth-child(1){height:40%}.skyline span:nth-child(2){height:72%}
.skyline span:nth-child(3){height:52%}.skyline span:nth-child(4){height:90%}
.skyline span:nth-child(5){height:60%}.skyline span:nth-child(6){height:82%}
.skyline span:nth-child(7){height:46%}.skyline span:nth-child(8){height:68%}
.skyline span:nth-child(9){height:36%}
/* lit windows appear at dusk */
[data-theme="dark"] .skyline span{background-image:repeating-linear-gradient(
  0deg,transparent 0 4px,rgba(201,161,112,.5) 4px 5.5px,transparent 5.5px 9px)}
.sea{left:0;right:0;bottom:12%;height:30%;
  background:linear-gradient(180deg,var(--sea-top),var(--sea-bottom));transition:background 1s ease}
.sea-glint{left:8%;right:36%;bottom:24%;height:2px;background:var(--glint);
  filter:blur(1px);animation:glint 5.5s ease-in-out infinite;transition:background 1s ease}
@keyframes glint{0%,100%{opacity:.35;transform:scaleX(.9)}50%{opacity:.9;transform:scaleX(1)}}
.terrace{left:0;right:0;bottom:0;height:12%;background:var(--terrace);transition:background 1s ease}
.palm{left:-4%;bottom:-2%;width:52%;height:auto}
.palm-trunk{stroke:var(--palm);transition:stroke 1s ease}
.palm-leaves path{fill:var(--palm);transition:fill 1s ease}
.palm{transform-origin:60% 100%;animation:sway 9s ease-in-out infinite}
@keyframes sway{0%,100%{transform:rotate(0deg)}50%{transform:rotate(1.4deg)}}

/* floating chat card */
.chat-card{position:absolute;right:-14px;bottom:-30px;width:min(320px,86%);z-index:2;
  background:var(--surface);border:1px solid var(--line);border-radius:14px;
  box-shadow:var(--shadow);padding:16px;animation:floaty 7s ease-in-out infinite;
  transition:background .5s ease}
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-8px)}}
.chat-card-head{font-family:var(--mono);font-size:11px;letter-spacing:.14em;color:var(--text-2);
  display:flex;align-items:center;gap:8px;margin-bottom:12px}
.spark{color:var(--brand-ink)}
[data-theme="dark"] .spark{color:var(--brand)}
.online{margin-left:auto;display:flex;align-items:center;gap:6px;color:var(--ai-strong);
  font-size:10px;letter-spacing:.1em;text-transform:uppercase}
.live-dot{width:7px;height:7px;border-radius:50%;background:var(--ai);animation:pulse 1.8s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.3}}
.chat-card-body{display:flex;flex-direction:column;gap:8px;min-height:150px}
.chat-card-langs{display:flex;gap:6px;margin-top:12px;flex-wrap:wrap}
.chat-card-langs span{font-family:var(--mono);font-size:10px;padding:4px 10px;
  border:1px solid var(--ai);color:var(--ai-strong);border-radius:5px;letter-spacing:.1em}

/* chat bubbles (hero card + demo share these) */
.bubble{max-width:88%;padding:9px 13px;font-size:13.5px;line-height:1.5;border-radius:3px 12px 12px 12px;
  opacity:0;transform:translateY(8px);transition:opacity .45s,transform .45s}
.bubble.show{opacity:1;transform:none}
.bubble .who{display:block;font-family:var(--mono);font-size:9.5px;letter-spacing:.12em;
  text-transform:uppercase;margin-bottom:3px;color:var(--muted)}
.bubble.lead{background:var(--surface-2);border:1px solid var(--line);align-self:flex-start}
.bubble.ai{background:var(--ai);color:#FFFFFF;align-self:flex-end;border-radius:12px 3px 12px 12px}
[data-theme="dark"] .bubble.ai{background:var(--ai-wash);color:var(--text);
  border:1px solid var(--ai);box-shadow:0 0 18px rgba(95,160,174,.25)}
.bubble.ai .who{color:rgba(255,255,255,.75)}
[data-theme="dark"] .bubble.ai .who{color:var(--ai)}

/* ---------- division ---------- */
.two-cols{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:44px}
.col{background:var(--surface);border:1px solid var(--line);padding:34px;border-radius:10px;box-shadow:var(--shadow);transition:background .5s ease}
.col h3{font-size:21px;margin-bottom:16px;letter-spacing:.04em}
.col-old h3{color:var(--muted)}
.col-new h3{color:var(--brand-ink)}
[data-theme="dark"] .col-new h3{color:var(--brand)}
.col-new{border-color:var(--brand)}
.col ul{list-style:none}
.col li{padding:9px 0;border-bottom:1px solid var(--line);font-size:15px;color:var(--text-2)}
.col li:last-child{border-bottom:none}
.col-old li{color:var(--muted)}

/* ---------- roi ---------- */
.roi{background:var(--bg-alt);transition:background .5s ease}
/* Rent/Sell toggle — company voice, so champagne fill + dark ink (contrast rule) */
.roi-modes{margin-top:36px;display:inline-flex;border:1px solid var(--line);border-radius:8px;overflow:hidden}
.roi-mode{background:none;border:none;color:var(--text-2);font-family:var(--mono);font-size:12px;
  letter-spacing:.1em;text-transform:uppercase;padding:11px 22px;cursor:pointer;transition:background .15s,color .15s}
.roi-mode[aria-pressed="true"]{background:var(--brand);color:var(--brand-contrast)}
.roi-mode:focus-visible{outline:2px solid var(--brand);outline-offset:-2px}
.roi-grid{display:grid;grid-template-columns:1fr 1fr;gap:52px;margin-top:28px;align-items:start}
.roi-grid[data-roi-mode="rent"] [data-panel="sell"]{display:none}
.roi-grid[data-roi-mode="sell"] [data-panel="rent"]{display:none}
.roi-note{font-family:var(--mono);font-size:12px;letter-spacing:.06em;color:var(--brand-ink);
  border:1px dashed var(--line);border-radius:8px;padding:10px 14px;display:inline-block}
[data-theme="dark"] .roi-note{color:var(--brand)}
.field{margin-bottom:28px}
.field label{display:flex;justify-content:space-between;gap:14px;font-size:14.5px;color:var(--text-2);margin-bottom:12px}
.field .val{font-family:var(--mono);color:var(--brand-ink);white-space:nowrap}
[data-theme="dark"] .field .val{color:var(--brand)}
input[type=range]{width:100%;accent-color:var(--brand);cursor:pointer}
.roi-out{background:var(--surface);border:1px solid var(--brand);padding:38px;border-radius:10px;box-shadow:var(--shadow);transition:background .5s ease}
.roi-label{font-family:var(--mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--muted)}
.roi-big{font-family:var(--mono);font-size:clamp(30px,4vw,44px);color:var(--danger);font-weight:500;margin:10px 0}
[data-theme="dark"] .roi-big{color:#D98A7F}
.roi-vs{margin-top:24px;padding-top:22px;border-top:1px solid var(--line);font-size:15px;color:var(--text-2)}
.roi-vs strong{color:var(--ai-strong);font-family:var(--mono)}

/* ---------- demo: dual-mode ---------- */
.demo-modes{margin-top:36px;display:inline-flex;border:1px solid var(--line);border-radius:8px;overflow:hidden}
.demo-mode{background:none;border:none;color:var(--text-2);font-family:var(--mono);font-size:12px;
  letter-spacing:.1em;text-transform:uppercase;padding:11px 20px;cursor:pointer;transition:background .15s,color .15s}
.demo-mode[aria-pressed="true"]{background:var(--ai);color:#fff}
.demo-mode:focus-visible{outline:2px solid var(--ai);outline-offset:-2px}
.demo-stage{margin-top:22px}
.demo-stage[data-demo-view="customer"] [data-panel="agent"]{display:none}
.demo-stage[data-demo-view="agent"] [data-panel="customer"]{display:none}
.demo-panel{display:flex;flex-direction:column;align-items:flex-start;gap:16px}
.demo-intro{font-size:14.5px;color:var(--ai-strong);max-width:520px}
/* demo cap card — company voice (champagne), shown when the visitor's demo messages run out */
.demo-cap{padding:18px 20px;border:1px dashed var(--brand);border-radius:10px;
  background:var(--surface);max-width:520px}
.demo-cap strong{display:block;color:var(--brand-ink);margin-bottom:6px;font-size:15px}
[data-theme="dark"] .demo-cap strong{color:var(--brand)}
.demo-cap p{font-size:14px;color:var(--text-2);margin-bottom:14px}
.demo-cap .btn{padding:11px 22px}

.demo-shell{background:var(--surface);border:1px solid var(--ai);
  max-width:640px;width:100%;border-radius:12px;overflow:hidden;box-shadow:var(--shadow);transition:background .5s ease}
.demo-head{padding:14px 18px;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:10px;
  font-family:var(--mono);font-size:12px;letter-spacing:.12em;color:var(--ai-strong)}
#agent-msgs{height:360px;overflow-y:auto;padding:18px;display:flex;flex-direction:column;gap:10px}
.chips{display:flex;gap:8px;flex-wrap:wrap;padding:0 18px 14px}
.demo-panel>.chips{padding:0}  /* standalone chips under the phone, outside a shell */
.chips button{background:none;border:1px solid var(--ai);color:var(--text-2);padding:7px 13px;
  font-size:13px;cursor:pointer;border-radius:20px;font-family:var(--body);transition:background .15s,color .15s}
.chips button:hover{background:var(--ai);color:#fff}
.chips button:disabled,.demo-input input:disabled,.demo-input button:disabled,
.phone-input input:disabled,.phone-input button:disabled{opacity:.4;cursor:default;pointer-events:none}
.demo-input{display:flex;border-top:1px solid var(--line)}
.demo-input input{flex:1;background:transparent;border:none;color:var(--text);padding:16px 18px;
  font-family:var(--body);font-size:15px}
.demo-input input:focus{outline:none;background:var(--surface-2)}
.demo-input button{background:var(--ai);border:none;color:#fff;padding:0 24px;cursor:pointer;
  font-family:var(--mono);font-size:12px;letter-spacing:.1em}
.demo-input button:hover{background:var(--ai-strong)}

/* ---------- demo: phone (customer tab) ---------- */
.channel-tabs{display:flex;gap:8px;flex-wrap:wrap}
.channel-tabs button{--ch:var(--text-2);background:none;border:1px solid var(--line);border-radius:20px;
  color:var(--text-2);font-family:var(--mono);font-size:12px;letter-spacing:.08em;
  padding:8px 16px;cursor:pointer;transition:border-color .15s,color .15s,background .15s}
.channel-tabs [data-channel="messenger"]{--ch:var(--ch-messenger)}
.channel-tabs [data-channel="zalo"]{--ch:var(--ch-zalo)}
.channel-tabs [data-channel="whatsapp"]{--ch:var(--ch-whatsapp)}
.channel-tabs [data-channel="telegram"]{--ch:var(--ch-telegram)}
.channel-tabs button[aria-pressed="true"]{border-color:var(--ch);color:var(--ch);
  background:color-mix(in srgb,var(--ch) 10%,transparent)}
.channel-tabs button:focus-visible{outline:2px solid var(--ai);outline-offset:2px}

/* the accent cascades from the active channel */
.phone{--ch:var(--ch-messenger);width:min(340px,100%);border-radius:46px;padding:10px;
  background:var(--brand-contrast);border:1px solid var(--line);box-shadow:var(--shadow)}
.phone[data-channel="zalo"]{--ch:var(--ch-zalo)}
.phone[data-channel="whatsapp"]{--ch:var(--ch-whatsapp)}
.phone[data-channel="telegram"]{--ch:var(--ch-telegram)}
.phone-screen{position:relative;background:var(--surface);border-radius:37px;overflow:hidden;
  display:flex;flex-direction:column;height:600px;transition:background .5s ease}
.phone-screen::before{content:"";position:absolute;top:11px;left:50%;transform:translateX(-50%);
  width:94px;height:26px;border-radius:14px;background:var(--brand-contrast);z-index:5}
.phone-status{display:flex;justify-content:space-between;align-items:center;
  padding:15px 26px 4px;font-size:13px;font-weight:600;color:var(--text)}
.p-status-icons{display:flex;align-items:center;gap:5px}
.phone-chat-head{display:flex;align-items:center;gap:10px;padding:10px 16px 12px;
  border-bottom:1px solid var(--line)}
.p-avatar{width:34px;height:34px;border-radius:50%;background:var(--ch);color:#fff;
  display:grid;place-items:center;font-size:15px;font-weight:600;transition:background .3s ease}
.p-contact{display:flex;flex-direction:column;line-height:1.25}
.p-contact strong{font-size:14.5px;font-weight:600;color:var(--text)}
.p-channel-name{font-size:11.5px;color:var(--muted)}
.phone-msgs{flex:1;overflow-y:auto;padding:14px 14px 8px;display:flex;flex-direction:column;gap:7px}
.p-msg{display:flex;flex-direction:column;max-width:80%}
.p-msg.in{align-self:flex-start}
.p-msg.out{align-self:flex-end;align-items:flex-end}
.p-bubble{position:relative;padding:8px 13px;font-size:14.5px;line-height:1.4;border-radius:18px}
.p-msg.in .p-bubble{background:color-mix(in srgb,var(--text) 9%,var(--surface));color:var(--text)}
.p-msg.out .p-bubble{background:var(--ch);color:#fff;transition:background .3s ease}
/* iMessage tails: an accent lobe + a screen-colored cut */
.p-msg.in .p-bubble::before{content:"";position:absolute;left:-7px;bottom:0;width:18px;height:18px;
  background:color-mix(in srgb,var(--text) 9%,var(--surface));border-bottom-right-radius:15px}
.p-msg.in .p-bubble::after{content:"";position:absolute;left:-10px;bottom:0;width:10px;height:20px;
  background:var(--surface);border-bottom-right-radius:10px;transition:background .5s ease}
.p-msg.out .p-bubble::before{content:"";position:absolute;right:-7px;bottom:0;width:18px;height:18px;
  background:var(--ch);border-bottom-left-radius:15px;transition:background .3s ease}
.p-msg.out .p-bubble::after{content:"";position:absolute;right:-10px;bottom:0;width:10px;height:20px;
  background:var(--surface);border-bottom-left-radius:10px;transition:background .5s ease}
.p-bubble>*{position:relative;z-index:1}
/* typing indicator */
.p-typing{display:inline-flex;gap:4px;align-items:center;min-height:20px}
.p-typing span{width:7px;height:7px;border-radius:50%;
  background:color-mix(in srgb,var(--text) 45%,transparent);animation:p-bounce 1.2s infinite}
.p-typing span:nth-child(2){animation-delay:.15s}
.p-typing span:nth-child(3){animation-delay:.3s}
@keyframes p-bounce{0%,60%,100%{transform:none;opacity:.45}30%{transform:translateY(-4px);opacity:1}}
/* delivered / read ticks */
.p-tick{font-size:10.5px;color:var(--muted);margin:3px 5px 0;letter-spacing:-.05em}
.p-tick.read{color:var(--ch)}
.phone-input{display:flex;align-items:center;gap:8px;padding:8px 12px 4px;border-top:1px solid var(--line)}
.phone-input input{flex:1;background:var(--surface-2);border:1px solid var(--line);border-radius:18px;
  padding:9px 14px;font-family:var(--body);font-size:14px;color:var(--text)}
.phone-input input:focus{outline:none;border-color:var(--ch)}
.phone-input button{width:34px;height:34px;border-radius:50%;border:none;background:var(--ch);
  color:#fff;font-size:17px;line-height:1;cursor:pointer;transition:background .3s ease}
.p-home{height:24px;display:grid;place-items:center}
.p-home::after{content:"";width:118px;height:5px;border-radius:3px;
  background:color-mix(in srgb,var(--text) 30%,transparent)}

/* ---------- tiers ---------- */
.tier-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:44px}
.tier{background:var(--surface);border:1px solid var(--line);padding:36px 30px;border-radius:10px;
  display:flex;flex-direction:column;box-shadow:var(--shadow);position:relative;
  transition:transform .2s ease,border-color .2s ease,background .5s ease}
.tier:hover{transform:translateY(-5px)}
.tier-feature{border-color:var(--brand)}
.tier-tag{position:absolute;top:-11px;left:30px;background:var(--brand);color:var(--brand-contrast);
  font-family:var(--mono);font-size:10px;letter-spacing:.14em;text-transform:uppercase;padding:4px 12px;border-radius:4px}
.tier h3{font-size:22px;letter-spacing:.1em;margin-bottom:4px}
.tier .price{font-family:var(--mono);color:var(--brand-ink);font-size:16px;margin-bottom:22px}
[data-theme="dark"] .tier .price{color:var(--brand)}
.tier .price span{color:var(--muted);font-size:13px}
.tier ul{list-style:none;flex:1;margin-bottom:26px}
.tier li{padding:8px 0;font-size:14.5px;color:var(--text-2);border-bottom:1px solid var(--line)}
.tier li:last-child{border:none}
.tier-cta{text-align:center}
.tier-addon{margin-top:30px;font-size:14.5px;color:var(--text-2);border:1px dashed var(--brand);
  border-radius:10px;padding:14px 18px;display:inline-block;background:var(--surface)}
.tier-note{margin-top:14px;font-size:13px;color:var(--muted);max-width:640px}
.slots{margin-top:26px;font-family:var(--mono);font-size:13px;color:var(--brand-ink);
  letter-spacing:.08em;display:flex;align-items:center;gap:10px}
[data-theme="dark"] .slots{color:var(--brand)}
.slots-dot{width:8px;height:8px;border-radius:50%;background:var(--brand);animation:pulse 2s infinite}
.reserve{margin-top:24px;display:flex;flex-direction:column;align-items:flex-start;gap:12px}
.reserve-note{font-size:13px;color:var(--muted);max-width:440px}

/* ---------- feature showcase (Task 3) ---------- */
.showcase .wrap{max-width:1000px}
.feat{display:grid;grid-template-columns:1fr 1fr;gap:52px;align-items:center;margin-top:72px}
.feat:first-of-type{margin-top:52px}
.feat--rev .feat-text{order:2}                 /* alternating: text right, visual left */
.feat-text h3{font-family:var(--display);font-weight:400;line-height:1.16;
  font-size:clamp(23px,2.5vw,31px);color:var(--brand-ink);margin-bottom:14px}
[data-theme="dark"] .feat-text h3{color:var(--brand)}
.feat-text p{color:var(--text-2);font-size:17px;line-height:1.6;max-width:430px}
.feat-visual{position:relative;aspect-ratio:4/3;border-radius:14px;overflow:hidden;
  border:1px solid var(--line);box-shadow:var(--shadow);
  background:linear-gradient(140deg,var(--sea-top),var(--sea-bottom))}
.feat-visual img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;display:block}
.feat-ph{position:absolute;inset:0;display:grid;place-items:center;font-size:34px;color:var(--brand);opacity:.5}
/* CSS mockups (blocks 4-6) */
.feat-mock{background:var(--surface-2);display:grid;place-items:center;padding:30px}
.mk-cal{width:min(300px,100%);display:flex;flex-direction:column;gap:8px}
.mk-cal-row{display:flex;align-items:center;gap:12px;background:var(--surface);border:1px solid var(--line);
  border-radius:9px;padding:12px 14px;font-size:14px;color:var(--text-2)}
.mk-cal-row .mk-t{font-family:var(--mono);font-size:12px;color:var(--muted)}
.mk-cal-row .mk-l{flex:1}
.mk-cal-row.mk-on{border-color:var(--brand);color:var(--text);background:color-mix(in srgb,var(--brand) 9%,var(--surface))}
.mk-ok{color:var(--brand-ink);font-weight:600}
[data-theme="dark"] .mk-ok{color:var(--brand)}
.mk-wake{display:flex;align-items:center;gap:18px}
.mk-old{width:70px;height:34px;border-radius:16px;background:var(--surface);border:1px solid var(--line);
  display:grid;place-items:center;color:var(--muted);letter-spacing:2px}
.mk-new{width:52px;height:52px;border-radius:50%;background:var(--ai);color:#fff;display:grid;place-items:center;
  font-size:22px;box-shadow:var(--shadow)}
.mk-take{display:flex;align-items:center;gap:12px;background:var(--surface);border:1px solid var(--line);
  border-radius:10px;padding:14px 16px}
.mk-take-dot{width:8px;height:8px;border-radius:50%;background:var(--ai);animation:pulse 2s infinite}
.mk-take-ai{font-family:var(--mono);font-size:12px;letter-spacing:.12em;color:var(--ai-strong);flex:1}
.mk-take-btn{font-family:var(--mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;
  background:var(--brand);color:var(--brand-contrast);padding:7px 14px;border-radius:6px}

/* ---------- cockpit — dashboard preview (CSS mockup of the agent platform) ---------- */
.cockpit{background:var(--bg-alt);transition:background .5s ease}
.cockpit-grid{display:grid;grid-template-columns:1.15fr 1fr;gap:52px;margin-top:44px;align-items:center}
.ck-frame{background:var(--surface);border:1px solid var(--line);border-radius:14px;overflow:hidden;
  box-shadow:var(--shadow);transition:background .5s ease}
.ck-bar{display:flex;align-items:center;gap:6px;padding:10px 14px;border-bottom:1px solid var(--line);background:var(--surface-2)}
.ck-bar span{width:9px;height:9px;border-radius:50%;background:var(--line)}
.ck-bar em{margin-left:10px;font-style:normal;font-family:var(--mono);font-size:11px;color:var(--muted);letter-spacing:.06em}
.ck-screen{padding:18px}
.ck-head{font-family:var(--mono);font-size:11px;letter-spacing:.14em;color:var(--brand-ink);
  display:flex;align-items:center;gap:8px;margin-bottom:14px}
[data-theme="dark"] .ck-head{color:var(--brand)}
.ck-agent{color:var(--muted)}
.ck-head .online{margin-left:auto}
.ck-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.ck-stat{background:var(--surface-2);border:1px solid var(--line);border-radius:8px;padding:12px 8px;text-align:center}
.ck-stat b{display:block;font-family:var(--mono);font-size:20px;font-weight:500;color:var(--brand-ink)}
[data-theme="dark"] .ck-stat b{color:var(--brand)}
.ck-stat.ck-ai b{color:var(--ai-strong)}
.ck-stat span{font-size:10.5px;color:var(--muted);letter-spacing:.04em}
.ck-hot{display:flex;align-items:center;gap:12px;margin-top:12px;padding:12px 14px;
  border:1px solid var(--brand);border-radius:8px;background:color-mix(in srgb,var(--brand) 8%,transparent)}
.ck-hot-dot{width:8px;height:8px;border-radius:50%;background:var(--brand);animation:pulse 2s infinite;flex:none}
.ck-hot-info{flex:1;min-width:0}
.ck-hot-info b{display:block;font-size:13.5px}
.ck-hot-info span{font-size:12px;color:var(--muted)}
.ck-take{font-family:var(--mono);font-size:10px;letter-spacing:.1em;text-transform:uppercase;
  background:var(--ai);color:#fff;padding:6px 12px;border-radius:5px;flex:none}
.ck-props{margin-top:12px;display:flex;flex-direction:column}
.ck-prop{display:flex;align-items:center;gap:12px;padding:10px 2px;border-bottom:1px solid var(--line)}
.ck-prop:last-child{border-bottom:none}
.ck-thumb{width:38px;height:30px;border-radius:5px;flex:none;background:linear-gradient(135deg,var(--sea-top),var(--sea-bottom))}
.ck-prop > div{flex:1;min-width:0}
.ck-prop b{display:block;font-size:13px}
.ck-prop div span{font-size:11.5px;color:var(--muted)}
.ck-prop em{font-style:normal;font-family:var(--mono);font-size:10px;letter-spacing:.08em;
  color:var(--brand-ink);border:1px solid var(--brand);border-radius:4px;padding:3px 8px;flex:none}
.ck-prop em.ck-ok{color:var(--ai-strong);border-color:var(--ai)}
.ck-feats{list-style:none;margin-bottom:30px}
.ck-feats li{padding:11px 0;border-bottom:1px solid var(--line);font-size:15.5px;color:var(--text-2)}
.ck-feats li:last-child{border-bottom:none}

/* ---------- case ---------- */
.case{background:var(--bg-alt);transition:background .5s ease}
.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;margin-top:44px}
.metric{background:var(--surface);border:1px solid var(--line);padding:30px 24px;border-radius:10px;box-shadow:var(--shadow);transition:background .5s ease}
.metric .n{font-family:var(--mono);font-size:34px;color:var(--ai-strong);font-weight:500}
.metric .l{font-size:13.5px;color:var(--muted);margin-top:8px}
.case-note{margin-top:20px;color:var(--muted);font-size:13px}

/* ---------- cta / footer ---------- */
.cta{text-align:center}
.cta h2{margin:14px auto 18px}
.cta .btn{margin-top:34px}
footer{border-top:1px solid var(--line);padding:44px 0}
.footer-inner{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;
  color:var(--muted);font-size:13.5px}
footer .wordmark{font-size:15px}

/* ---------- scroll reveal ---------- */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:960px){
  .doors{grid-template-columns:1fr;max-width:440px}
  .lobby{min-height:0}
  .hero-grid{grid-template-columns:1fr}
  .hero-scene{margin-top:26px}
  .chat-card{right:6px;bottom:-24px}
  /* mobile hero scrim: top-weighted so the stacked headline stays legible */
  .hero-bg::after{background:linear-gradient(180deg,color-mix(in srgb,var(--bg) 82%,transparent),
    color-mix(in srgb,var(--bg) 35%,transparent) 45%,color-mix(in srgb,var(--bg) 60%,transparent))}
  .nav-links{display:none}
  .feat{grid-template-columns:1fr;gap:24px;margin-top:48px}
  .feat--rev .feat-text{order:0}               /* text always above the visual on mobile */
  .two-cols,.roi-grid,.cockpit-grid{grid-template-columns:1fr}
  .tier-grid{grid-template-columns:1fr}
  .metrics{grid-template-columns:1fr 1fr}
  section{padding:68px 0}
}
@media (max-width:480px){
  .metrics{grid-template-columns:1fr}
  .nav-controls .btn-small{display:none}
  .ck-stats{grid-template-columns:1fr 1fr}
}

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