/* Toàn bộ CSS từ file index.html gốc */
*{box-sizing:border-box;margin:0;padding:0}

/* ===== Palette mặc định (sáng, chuyên nghiệp) ===== */
:root{
  --bg:#f9fafb; 
  --text:#111827; 
  --muted:#6b7280; 
  --border:#e5e7eb;

  --primary1:#2563eb; 
  --primary2:#3b82f6;

  /* (Giữ tương thích) */
  --blue1:#3b82f6; 
  --blue2:#2563eb;

  --card:#ffffff; 
  --ring:#93c5fd; 
  --shadow:0 8px 28px rgba(2,6,23,.06);
}

/* ===== Theme classes (toggle) ===== */
body.light{
  --bg:#f9fafb;
  --text:#111827;
  --muted:#6b7280;
  --border:#e5e7eb;
  --card:#ffffff;
  --primary1:#2563eb;
  --primary2:#3b82f6;
  --shadow:0 8px 28px rgba(2,6,23,.06);
}
body.dark{
  --bg:#0b1220;
  --text:#e6e9ef;
  --muted:#98a3b7;
  --border:#22304a;
  --card:#0f172a;
  --primary1:#3b82f6;
  --primary2:#60a5fa;
  --shadow:0 8px 32px rgba(0,0,0,.45);
}
/* Chuyển mượt giữa theme */
html, body, .card, .chat, .stepper, .topbar{
  transition: background-color .25s ease, color .25s ease, border-color .25s ease, box-shadow .25s ease;
}

body{
  font-family:'Inter',system-ui,Segoe UI,Roboto,sans-serif;
  background:var(--bg);color:var(--text);
  min-height:100vh;
}

/* ================================ */
/* ===== UI CHUNG (Global) ===== */
/* ================================ */

.wrap{max-width:1100px;margin:0 auto;padding:16px}

/* Topbar - Updated Clean Style */
.topbar{
  position:sticky;
  top:0;
  z-index:90;
  background:#ffffff; /* Nền trắng sạch */
  border-bottom:1px solid var(--border);
}
body.dark .topbar{
  background:linear-gradient(180deg,#020617 0%,#020617 55%,#020617 100%);
  border-bottom:1px solid rgba(148,163,184,.35);
}

.tb-row{display:flex;align-items:center;gap:10px;padding:10px 12px}
.hamburger{
  width:36px;height:36px;border-radius:10px;
  border:1.5px solid var(--border);
  display:grid;place-items:center;cursor:pointer;background:#fff
}
body.dark .hamburger{ background:var(--card) }
.brand{font-weight:800; letter-spacing:.2px; margin-right:auto;} 

/* ===== SUBTITLE (typing text) ===== */
#typing-container {
  margin-top: -6px;     
  padding: 0 0 0 42px;  
  line-height: 1;
}

#typing-notify {
  font-size: 12px;
  font-style: italic;
  color: var(--muted);
}

/* Nút V1/V2 (Icon) */
.btn-version {
  display:flex;align-items:center;justify-content:center;
  width:40px;height:40px;border-radius:12px;
  border:1.5px solid var(--border);
  background:var(--card); color:var(--text);
  cursor:pointer; transition:all .25s ease;
  font-size:14px; font-weight: 700;
  box-shadow:0 4px 12px rgba(0,0,0,.06);
  text-decoration: none;
  margin-left:auto; 
}
.btn-version:hover{ transform:translateY(-1px); box-shadow:0 6px 16px rgba(0,0,0,.1) }
.btn-version svg { color: var(--text); } 

/* Theme toggle button */
.theme-toggle{
  width:40px;height:40px;border-radius:12px;
  border:1.5px solid var(--border);
  display:flex;align-items:center;justify-content:center;
  background:var(--card); color:var(--text);
  cursor:pointer; transition:all .25s ease;
  font-size:18px; box-shadow:0 4px 12px rgba(0,0,0,.06)
}
.theme-toggle:hover{ transform:translateY(-1px); box-shadow:0 6px 16px rgba(0,0,0,.1) }
.theme-toggle:focus{ outline:2px solid var(--ring); outline-offset:2px }

/* Typing effect adjustments */
#typing-container {
  padding: 0 12px 2px 56px;  
  margin-top: -10px;        
  text-align: left;
  background: transparent;
  border-bottom: none;
  opacity: 0;
  transform: translateY(-2px);
  animation: typingContainerIn .4s ease-out forwards;
}

@keyframes typingContainerIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

#typing-notify {
  font-size: 11.5px;
  color: var(--muted);
  font-family: inherit;
  font-weight: 500;
  font-style: italic; 
  white-space: nowrap;
  overflow: hidden;
  width: 0;
}

#typing-notify.typing-effect {
  animation: typing 3s steps(40, end) forwards;
}

@keyframes typing {
  from { width: 0 }
  to   { width: 100% }
}

#typing-notify.done {
  animation: none;
  border-right: none;
  width: auto;
}

/* Drawer */
.drawer{
  position:fixed;inset:0 35% 0 0;max-width:320px;background:#fff;
  border-right:1px solid var(--border);
  box-shadow:20px 0 60px rgba(2,6,23,.18);
  transform:translateX(-100%);
  transition:transform .5s cubic-bezier(.22,.61,.36,1);
  z-index:100;touch-action:pan-y
}
body.dark .drawer{ background:var(--card) }
.drawer.open{transform:none}
.drawer-head{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 16px;font-weight:900;border-bottom:1px solid var(--border)
}
#btnCloseDrawer{
  width:32px;height:32px;border-radius:8px;border:1px solid var(--border);background:#fff;cursor:pointer
}
body.dark #btnCloseDrawer{ background:var(--card) }
.drawer .menu{display:flex;flex-direction:column}
.drawer .menu a, .drawer .menu button{
  padding:14px 16px;text-align:left;background:var(--card);border:none;border-bottom:1px solid var(--border);
  font-weight:700;color:var(--text);cursor:pointer;display:flex;justify-content:space-between;align-items:center
}
.overlay{
  position:fixed;inset:0;background:rgba(15,23,42,.35);backdrop-filter:blur(2px);
  opacity:0;pointer-events:none;transition:opacity .4s;z-index:95
}
.overlay.show{opacity:1;pointer-events:auto}

/* Toast */
#toast {
  position:fixed; right:16px; bottom:16px; z-index:9999;
  background:#0f172acc; color:#fff; padding:10px 14px;
  border-radius:10px; box-shadow:0 10px 30px rgba(0,0,0,.2);
  font-size:14px; opacity:0; transition:opacity .2s;
  pointer-events: none;
}

/* ================================ */
/* ===== VIEW V2 (STEPPER) ===== */
/* ================================ */
#view-v1, #view-v2 { opacity: 1; transition: opacity .28s ease, transform .28s ease; }
.view-leave { opacity: 0; transform: translateY(8px); }
.view-active { opacity: 1; transform: none; }

#view-v2 .stepper{
  display:flex;gap:8px;justify-content:center;background:var(--card);padding:10px 8px;
  border-bottom:1px solid var(--border);position:sticky;top:55px; 
  z-index:80;
}
body.dark #view-v2 .stepper { background: rgba(11,18,32,.85); backdrop-filter: blur(8px); }
body.light #view-v2 .stepper { background: rgba(249,250,251,.85); backdrop-filter: blur(8px); }

#view-v2 .stepper button{
  appearance:none;border:1.5px solid var(--border);background:var(--card);
  border-radius:12px;padding:8px 14px;font-weight:800;color:var(--text);
  transition:box-shadow .15s ease, transform .15s ease
}
#view-v2 .stepper button:hover{transform:translateY(-1px); box-shadow:0 10px 28px rgba(2,6,23,.08)}
#view-v2 .stepper button.active{
  background:linear-gradient(90deg,var(--primary1),var(--primary2));color:#fff;border:none
}

/* Slider */
#view-v2 .viewport{overflow:hidden}
#view-v2 .steps{
  display:flex;
  transition:transform .9s cubic-bezier(.22,.61,.36,1);
  will-change:transform
}
#view-v2 .step{flex:0 0 100%;padding:16px}

/* Cards (V2) */
#view-v2 .card{
  background:var(--card);border:1px solid var(--border);
  border-radius:16px;box-shadow:var(--shadow);padding:14px
}
#view-v2 .row{display:flex;gap:12px;flex-wrap:wrap}
#view-v2 .pill{
  display:inline-flex;align-items:center;gap:8px;background:#f2f6fb;
  padding:6px 10px;border-radius:999px;border:1px solid #e7edf5;
  font-weight:500;font-size:12px
}
body.dark #view-v2 .pill{ background:#0f172a; border-color:#1f2a44 }

#view-v2 textarea, #view-v2 input, #view-v2 button{font-family:inherit}
#view-v2 textarea, #view-v2 input[type="text"]{
  width:100%;border:1.5px solid var(--border);border-radius:12px;
  padding:12px 14px;background:#fbfdff;transition:border .15s, box-shadow .15s; line-height:1.7; color:var(--text)
}
body.dark #view-v2 textarea, body.dark #view-v2 input[type="text"]{ background:#0f172a }
#view-v2 textarea{min-height:150px;resize:vertical}
#view-v2 textarea:focus, #view-v2 input[type="text"]:focus{border-color:#c7d2fe; box-shadow:0 0 0 3px rgba(59,130,246,.15)}

/* Nút V2 */
#view-v2 .btn{
  cursor:pointer;border:none;border-radius:12px;padding:12px 14px;font-weight:900;
  transition:transform .15s ease, box-shadow .15s ease
}
#view-v2 .btn:hover{transform:translateY(-1px); box-shadow:0 10px 28px rgba(2,6,23,.08)}
#view-v2 .btn:focus{outline:2px solid var(--ring); outline-offset:2px}
#view-v2 .btn-primary{
  background:linear-gradient(135deg,var(--primary1),var(--primary2));
  color:#fff;box-shadow:0 6px 18px rgba(37,99,235,.22)
}
#view-v2 .btn-danger{background:#fee2e2;color:#b91c1c}
#view-v2 .btn-outline{background:#fff;border:1.5px solid var(--border); color:var(--text)}
body.dark #view-v2 .btn-outline{ background:transparent }
#view-v2 .count{font-size:12px;color:var(--muted);margin-top:6px}
#view-v2 .hint{font-size:12px;color:var(--muted)}
#view-v2 .group-btn{
  border:none;border-radius:10px;padding:8px 12px;
  background:linear-gradient(135deg,var(--primary1),var(--primary2));color:#fff;font-weight:800;cursor:pointer
}

/* Bước 1 — Hero + Chatbar */
#view-v2 .ghost-hero {
  height:24vh;
  display:grid;
  place-items:center;
  color:#334155;
  font-weight:500;
  font-size:18px;
  text-align:center;
  padding:0 12px;
  letter-spacing:.2px;
}
#view-v2 .ghost-hero span {
  display:inline-block;
  opacity:0;
  transform: translateY(6px);
  font-weight:600;
  font-size:19px;
  animation: heroLineIn .6s ease-out .25s forwards;
}
#view-v2 .hero-tight { margin-top:8px; }
@keyframes heroLineIn {
  from { opacity:0; transform: translateY(6px); }
  to { opacity:1; transform: translateY(0); }
}

#view-v2 .chatbar{
  position:fixed;left:0;right:0;bottom:0;
  padding:12px 12px calc(12px + env(safe-area-inset-bottom,12px));
  background:linear-gradient(180deg,transparent,rgba(255,255,255,.92));
  backdrop-filter:saturate(160%) blur(6px);z-index:120; opacity:0; transform:translateY(8px);
  animation: fadeUp .35s ease .1s forwards;
  transition: transform 0.25s ease-out;
}
body.dark #view-v2 .chatbar { background:linear-gradient(180deg,transparent,rgba(11,18,32,.92)); }
@keyframes fadeUp{to{opacity:1; transform:translateY(0)}}

#view-v2 .chat{
  max-width:900px;margin:0 auto;display:flex;gap:10px;align-items:flex-end;
  background:var(--card);border:1.5px solid var(--border);border-radius:18px;padding:10px;box-shadow:0 8px 24px rgba(2,6,23,.08)
}
#view-v2 .chat textarea{
  flex:1;border:none;background:transparent;outline:none;resize:none;overflow:hidden;
  min-height:42px;max-height:40vh;line-height:1.6
}
#view-v2 .chat .btn-round{
  width:44px;height:44px;border-radius:999px;border:1px solid var(--border);
  background:var(--card);color:var(--text);cursor:pointer;
  display:grid;place-items:center;font-size:18px;font-weight:900
}
#view-v2 #chatSend{border:none;background:linear-gradient(135deg,var(--primary1),var(--primary2));color:#fff}

#view-v2 .grid{display:grid;gap:16px}
@media (min-width: 940px){ #view-v2 .grid{grid-template-columns:1fr 1fr} }

#v2_groupedDisplay .group-line{
  display:flex;gap:8px;align-items:center;justify-content:space-between;
  border:1px dashed var(--border);padding:8px 10px;border-radius:10px;background:#f8fafc;
  transition:background .15s, border-color .15s
}
body.dark #v2_groupedDisplay .group-line{ background:#0f172a; border-color:#273556 }
#v2_groupedDisplay .group-line:hover{background:#f9fbff; border-color:#dbeafe}

#view-v2 .chevron{
  width:30px;height:30px;border:1px solid var(--border);border-radius:8px;background:var(--card);display:grid;place-items:center;cursor:pointer;transition:background .15s, border-color .15s
}
#view-v2 .chevron svg{transition:transform .25s}
#view-v2 .chevron[aria-expanded="true"] svg{transform:rotate(180deg)}
#view-v2 .chevron:hover{background:#f8fafc; border-color:#dbe3ec}
#view-v2 .chevron:focus{outline:2px solid var(--ring); outline-offset:2px}
#view-v2 .pill-wrap{display:flex;gap:10px;flex-wrap:wrap}
#view-v2 .pill-wrap[hidden]{display:none !important}

#view-v2 .fade-in{animation:fade .28s ease-in-out}
@keyframes fade{from{opacity:0;transform:translateY(6px)} to{opacity:1;transform:none}}

/* ================================ */
/* ===== VIEW V1 (DESKTOP) ===== */
/* ================================ */
body.dark {
  --v1-border:rgba(75,85,129,.3);
  --v1-card-bg:rgba(15,23,52,.82);
  --v1-input-bg:rgba(20,29,61,.9);
  --v1-pill-bg:rgba(26,43,94,.58);
  --v1-text:#e8eef7; --v1-label:#b8c5e0; --v1-muted:#8b9cc9; --v1-count:#a3b3db;
  --v1-btn-bg:linear-gradient(135deg,#3b5998,#5a7ec7);
  --v1-btn-hover:linear-gradient(135deg,#4a68a7,#6a8ed7);
  --v1-btn-text:#fff; --v1-btn-shadow:rgba(59,89,152,.3); --v1-btn-shadow-hover:rgba(59,89,152,.45);
  --v1-accent:#5b8def; --v1-accent-shadow:rgba(91,141,239,.22);
  --v1-ok:#3dd68d; --v1-bad:#ff6b6b; --v1-warning:#ffa94d; --v1-progress-bg:rgba(30,42,73,.6); --v1-shadow:rgba(0,0,0,.18);
}
body.light {
  --v1-border:rgba(203,213,224,.6); --v1-card-bg:#fff; --v1-input-bg:#f7fafc; --v1-pill-bg:#edf2f7;
  --v1-text:#1e293b; --v1-label:#475569; --v1-muted:#64748b; --v1-count:#475569;
  --v1-btn-bg:linear-gradient(135deg,#3b82f6,#2563eb);
  --v1-btn-hover:linear-gradient(135deg,#2563eb,#1d4ed8);
  --v1-btn-text:#fff; --v1-btn-shadow:rgba(59,130,246,.28); --v1-btn-shadow-hover:rgba(59,130,246,.42);
  --v1-accent:#3b82f6; --v1-accent-shadow:rgba(59,130,246,.18);
  --v1-ok:#10b981; --v1-bad:#ef4444; --v1-warning:#f59e0b; --v1-progress-bg:rgba(226,232,240,.85); --v1-shadow:rgba(0,0,0,.06);
}

body.dark #view-v1 {
  --border: var(--v1-border); --card-bg: var(--v1-card-bg); --input-bg: var(--v1-input-bg);
  --pill-bg: var(--v1-pill-bg); --text: var(--v1-text); --label: var(--v1-label);
  --muted: var(--v1-muted); --count: var(--v1-count); --btn-bg: var(--v1-btn-bg);
  --btn-hover: var(--v1-btn-hover); --btn-text: var(--v1-btn-text); --btn-shadow: var(--v1-btn-shadow);
  --btn-shadow-hover: var(--v1-btn-shadow-hover); --accent: var(--v1-accent); --accent-shadow: var(--v1-accent-shadow);
  --ok: var(--v1-ok); --bad: var(--v1-bad); --warning: var(--v1-warning); --progress-bg: var(--v1-progress-bg);
  --shadow: var(--v1-shadow);
  color: var(--v1-text);
  background: linear-gradient(135deg,#0a0e27 0%,#1a1f3a 100%);
}
body.light #view-v1 {
  --border: var(--v1-border); --card-bg: var(--v1-card-bg); --input-bg: var(--v1-input-bg);
  --pill-bg: var(--v1-pill-bg); --text: var(--v1-text); --label: var(--v1-label);
  --muted: var(--v1-muted); --count: var(--v1-count); --btn-bg: var(--v1-btn-bg);
  --btn-hover: var(--v1-btn-hover); --btn-text: var(--v1-btn-text); --btn-shadow: var(--v1-btn-shadow);
  --btn-shadow-hover: var(--v1-btn-shadow-hover); --accent: var(--v1-accent); --accent-shadow: var(--v1-accent-shadow);
  --ok: var(--v1-ok); --bad: var(--v1-bad); --warning: var(--v1-warning); --progress-bg: var(--v1-progress-bg);
  --shadow: var(--v1-shadow);
  color: var(--v1-text);
  background: linear-gradient(135deg,#f0f4f8 0%,#d9e2ec 100%);
}
 
#view-v1 .grid{display:grid;gap:16px}
@media(min-width:940px){#view-v1 .grid{grid-template-columns:1fr 1fr}}
 
#view-v1 textarea, #view-v1 input, #view-v1 button{
  width:100%;border-radius:14px;border:2px solid var(--border);background:var(--input-bg);
  color:var(--text);padding:12px 14px;font-size:14px;outline:none;transition:all .2s;font-family:inherit
}
#view-v1 textarea{min-height:160px;resize:vertical;line-height:1.7}
#view-v1 textarea:focus, #view-v1 input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-shadow)}

#view-v1 label{display:block;margin:6px 0 4px 2px;font-size:12px;font-weight:700;color:var(--label);text-transform:uppercase;letter-spacing:.5px}
#view-v1 .hint{font-size:12px;color:var(--muted);margin:2px 0 8px 2px}

#view-v1 .card{border:2px solid var(--border);background:var(--card-bg);border-radius:16px;padding:14px;box-shadow:0 4px 14px var(--shadow)}
#view-v1 .row{display:flex;gap:10px;flex-wrap:wrap}
#view-v1 .row>button{flex:1;min-width:130px}
 
#view-v1 button{
  cursor:pointer;
  padding:10px 14px;border-radius:12px;font-weight:700;font-size:13px;transition:transform .15s, box-shadow .2s;
  text-transform:uppercase;letter-spacing:.4px
}
#view-v1 button.btn-primary {
  background: var(--v1-btn-bg);
  color: var(--v1-btn-text);
  box-shadow: var(--v1-btn-shadow);
  border: 2px solid transparent; 
}
#view-v1 button.btn-primary:hover:not(:disabled){
  background:var(--v1-btn-hover);
  transform:translateY(-1px);
  box-shadow:0 4px 14px var(--v1-btn-shadow-hover);
}
#view-v1 button.btn-danger {
  background: #fee2e2;
  color: #b91c1c;
  border: 2px solid transparent;
}
#view-v1 button.btn-danger:hover:not(:disabled){
  transform: translateY(-1px);
  box-shadow:0 3px 10px rgba(248,113,113,.4);
}
#view-v1 button.btn-outline {
  background: transparent;
  color: var(--v1-text);
  border: 2px solid var(--border);
}
#view-v1 button.btn-outline:hover:not(:disabled){
  transform: translateY(-1px);
  box-shadow:0 3px 10px var(--v1-shadow);
}
#view-v1 .count{font-size:12px;color:var(--count);margin-top:4px}
#view-v1 .mono{font-family:'JetBrains Mono','Fira Code',monospace;font-size:11px}

/* Progress bar V1 */
#view-v1 .progress{
  margin-top:8px;
  width:100%;
  background:var(--v1-progress-bg);
  border-radius:999px;
  overflow:hidden;
  height:8px;
  box-shadow:0 2px 8px rgba(15,23,42,.25)
}
#view-v1 .progress-bar{
  height:100%;
  width:0;
  border-radius:999px;
  background:var(--v1-accent);
  box-shadow:0 0 0 1px rgba(255,255,255,.3),0 0 20px var(--v1-accent-shadow);
  transition:width .15s ease-out;
}

#view-v1 .hint.ok{color:var(--v1-ok)}
#view-v1 .hint.bad{color:var(--v1-bad)}
#view-v1 .hint.warning{color:var(--v1-warning)}

#view-v1 .togglebar{
  display:flex;align-items:center;justify-content:space-between;margin-bottom:4px
}
#view-v1 .chev-wrap{
  display:flex;align-items:center;gap:6px
}
#view-v1 .chev-hint{
  font-size:11px;color:var(--v1-muted)
}
#view-v1 .chev-btn{
  width:26px;height:26px;border-radius:999px;border:1px solid var(--border);background:var(--card-bg);
  display:grid;place-items:center;font-size:13px;cursor:pointer;color:var(--muted)
}

#view-v1 .pillgroup { display:flex; gap:8px; flex-wrap:wrap; }
#view-v1 .pillgroup[hidden] { display:none !important; }
#view-v1 .pillgroup .pill{
  background:var(--v1-pill-bg);border-radius:999px;padding:5px 10px;font-size:11px;font-weight:600;color:var(--v1-text);
  display:inline-flex;align-items:center;gap:4px
}
#view-v1 .pillgroup .pill input{accent-color:var(--v1-accent)}

#view-v1 #v1_groupedDisplay{
  margin-top:10px;
  display:flex;flex-direction:column;gap:8px
}
#view-v1 #v1_groupedDisplay .group-btn{
  border-radius:999px;
  padding:6px 12px;
  border:1px solid var(--v1-accent);
  background:transparent;
  color:var(--v1-accent);
  font-size:11px;
  font-weight:700;
  text-transform:uppercase;
  letter-spacing:.5px;
}
#view-v1 #v1_groupedDisplay .group-btn.copied{
  background:var(--v1-accent);
  color:#fff;
}

/* ===== BRAND + GRADIENT TITLE UPDATED (Clean Orange) ===== */
.brand {
  display:flex;
  align-items:center;
  gap:10px;
  line-height:1.05;
  cursor:pointer; 
}

.brand-logo {
  width:32px;
  height:32px;
  object-fit:contain;
  filter:drop-shadow(0 2px 4px rgba(0,0,0,.15));
  transition:transform .18s ease, filter .18s ease;
}

.brand-title {
  font-weight:800;
  font-size:16px;
  color:#f97316; /* Clean Orange */
  letter-spacing:0.2px;
  text-decoration:none; 
  display:inline-block;
  text-shadow: none;
  transition:transform .18s ease;
}

.brand:hover .brand-logo,
.brand:hover .brand-title {
  transform:translateY(-1px);
}

body.dark .brand-title{
  color:#fbb794;
}

/* Responsive nhỏ cho V1 */
@media(max-width:768px){
  #view-v1 .row{flex-direction:column}
}

/* =========================================
   2. BANNER "CLEAN SLIDE" (THEO YÊU CẦU)
   ========================================= */
.promo-banner {
        /* Nền trắng sáng, pha chút loang màu hồng nhạt rất nhẹ */
        background: linear-gradient(to right, #ffffff, #fff1f2);
        border-bottom: 1px solid #fda4af; /* Viền hồng đỏ tinh tế */
        padding: 12px 16px;
        display: flex; align-items: center; justify-content: center; gap: 12px;
        position: relative;
        text-decoration: none;
        box-shadow: 0 4px 15px rgba(253, 164, 175, 0.2); /* Bóng nhẹ */
        animation: slideDown 0.5s ease-out;
        z-index: 99;
}
body.dark .promo-banner {
    background: #0f172a;
    border-bottom: 1px solid #ea580c;
    box-shadow: none;
}

/* Animation trượt xuống */
@keyframes slideDown {
    from { transform: translateY(-100%); opacity: 0; max-height: 0; }
    to { transform: translateY(0); opacity: 1; max-height: 60px; }
}

.promo-content {
        font-size: 15px; 
        /* Chữ màu Đỏ Berry (Đậm đà, dễ đọc trên nền sáng) */
        color: #be123c; 
        font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
        font-weight: 700;
        letter-spacing: 0.3px;
        display: flex; align-items: center; gap: 8px;
}
body.dark .promo-content { color: #e2e8f0; }

.promo-badge {
        /* Badge màu Đỏ, chữ Trắng để nổi bật */
        background: #e11d48; 
        color: #ffffff;
        font-size: 11px; font-weight: 800;
        padding: 3px 10px; border-radius: 99px; 
        box-shadow: 0 2px 5px rgba(225, 29, 72, 0.3);
        animation: bounce 2s infinite;
}

@keyframes pulse-badge {
    0% { transform: scale(1); box-shadow: 0 0 0 0 rgba(249, 115, 22, 0.7); }
    70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(249, 115, 22, 0); }
    100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(249, 115, 22, 0); }
}

.promo-arrow {
        color: #be123c; font-weight: bold; transition: transform 0.2s;
}
.promo-banner:hover .promo-arrow {
    transform: translateX(4px); /* Hiệu ứng di chuyển mũi tên khi hover */
}

.promo-close {
        position: absolute; right: 12px; top: 50%; transform: translateY(-50%);
        background: transparent; border: none; font-size: 16px;
        color: #fda4af; cursor: pointer; padding: 4px; transition: color 0.2s;
}
.promo-close:hover { color: #be123c; }

@keyframes pulse-slow {
    0% { opacity: 1; }
    50% { opacity: 0.85; }
    100% { opacity: 1; }
}

/* =========================================
   3. HIỆU ỨNG TUYẾT RƠI (CSS)
   ========================================= */
.snowflake {
    position: fixed;
    top: -10px;
    color: #e0f2fe; 
    font-size: 1em;
    font-family: Arial, sans-serif;
    text-shadow: 0 0 5px #fff;
    pointer-events: none;
    z-index: 9999;
    animation-name: snowfall;
    animation-timing-function: linear;
    animation-iteration-count: infinite;
}
body.dark .snowflake { color: #334155; opacity: 0.3; }

@keyframes snowfall {
    0% { transform: translateY(0); }
    100% { transform: translateY(100vh); }
}
/* =========================================
   4. TWEAKS THEO YÊU CẦU MỚI
   ========================================= */

/* 1. Ẩn tuyết trên mobile (< 768px) để không phân tâm */
@media (max-width: 768px) {
    .snowflake { display: none !important; }
}

/* 2. Class khóa Zoom (chỉ cho phép cuộn dọc, cấm pinch/double tap) */
body.zoom-locked {
    touch-action: pan-y; /* Chỉ cho phép lướt dọc */
    -webkit-user-select: none; /* Hạn chế select text gây double tap nhầm */
    user-select: none;
    overflow-x: hidden;
}

/* Style cho nút Khóa Zoom */
#btnLockZoom i { transition: transform 0.2s; }
.zoom-locked #btnLockZoom { 
    background: #fee2e2; /* Màu đỏ nhạt cảnh báo đang khóa */
    color: #ef4444; 
    border-color: #fca5a5;
}
/* =========================================
   5. FIX LỖI ZOOM INPUT & MOBILE TWEAKS
   ========================================= */

/* Ép cỡ chữ 16px cho ô nhập liệu trên Mobile */
/* Đây là "thuốc đặc trị" để iPhone không tự zoom khi bấm vào ô chat */
@media (max-width: 768px) {
    input[type="text"],
    textarea,
    select {
        font-size: 16px !important; 
    }
    
    /* Tùy chỉnh lại padding một chút để chữ 16px không bị lệch */
    #view-v2 textarea {
        padding: 10px 12px;
    }
}