/* ============================================================
   FBAgent AI — design system
   Palette: deep moss-black bg, bone text, single amber accent (locked)
   Type: Be Vietnam Pro (display+body, vietnamese), JetBrains Mono (code/data)
   Radius rule: buttons pill · cards 14px · inputs 10px
   ============================================================ */
*{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#0C1210;
  --bg-raise:#101915;
  --panel:#121C17;
  --panel-2:#16241D;
  --border:#243328;
  --border-strong:#33463A;
  --text:#E9E6DC;
  --muted:#98A69B;
  --faint:#5E6D62;
  --accent:#E8B23B;
  --accent-soft:#E8B23B26;
  --accent-ink:#1E1503;
  --ok:#69C797;
  --warn:#E0C067;
  --err:#E07B6B;
  --code-bg:#0A100D;
  --font:"Be Vietnam Pro",-apple-system,"Segoe UI",Roboto,sans-serif;
  --mono:"JetBrains Mono","SF Mono",Menlo,Consolas,monospace;
}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
}
body{font-family:var(--font);background:var(--bg);color:var(--text);
  line-height:1.65;min-height:100vh;display:flex;flex-direction:column;
  -webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:3px}
::selection{background:var(--accent);color:var(--accent-ink)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}

/* ---------- nav ---------- */
.nav{display:flex;justify-content:space-between;align-items:center;height:64px;
  padding:0 28px;border-bottom:1px solid var(--border);
  background:color-mix(in srgb,var(--bg) 88%,transparent);
  position:sticky;top:0;backdrop-filter:blur(10px);z-index:10}
.brand{font-family:var(--mono);font-weight:700;font-size:1.02rem;color:var(--text);letter-spacing:-.02em}
.brand:hover{text-decoration:none}
.brand .cursor{display:inline-block;width:.55em;height:1.05em;background:var(--accent);
  vertical-align:text-bottom;margin-left:2px;animation:blink 1.2s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.nav-links{display:flex;gap:22px;align-items:center}
.nav-links a{color:var(--muted);font-size:.93rem;font-weight:500}
.nav-links a:hover{color:var(--text);text-decoration:none}

/* ---------- layout ---------- */
.container{max-width:1120px;margin:0 auto;padding:40px 24px;width:100%;flex:1}
.footer{border-top:1px solid var(--border);padding:26px 28px;
  display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;
  color:var(--faint);font-size:.86rem}
.footer a{color:var(--muted)}

/* ---------- buttons: pill, one accent ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 22px;border-radius:999px;
  font-weight:600;font-size:.95rem;font-family:var(--font);
  border:1px solid transparent;cursor:pointer;white-space:nowrap;
  transition:transform .12s ease,opacity .12s ease,border-color .12s ease}
.btn:active{transform:translateY(1px) scale(.985)}
.btn:hover{text-decoration:none}
.btn-primary{background:var(--accent);color:var(--accent-ink)!important}
.btn-primary:hover{opacity:.88}
.btn-outline{border-color:var(--border-strong);color:var(--text)!important;background:transparent}
.btn-outline:hover{border-color:var(--accent);color:var(--accent)!important}
.btn-sm{padding:5px 14px;font-size:.83rem}
.btn-danger{border-color:var(--err);color:var(--err)!important;background:transparent}
.btn-danger:hover{background:#e07b6b1a}

/* ---------- hero (landing) ---------- */
.hero{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,6fr);gap:56px;
  align-items:center;padding:64px 0 72px}
.hero h1{font-size:clamp(1.9rem,4.2vw,3.1rem);line-height:1.14;font-weight:800;
  letter-spacing:-.03em;margin-bottom:18px}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero .lede{color:var(--muted);font-size:1.08rem;max-width:44ch;margin-bottom:28px}
.hero .cta{display:flex;gap:14px;align-items:center;flex-wrap:wrap}
.hero .cta .quiet{color:var(--muted);font-size:.93rem}

/* terminal — the signature element */
.term{background:var(--code-bg);border:1px solid var(--border-strong);border-radius:14px;
  overflow:hidden;box-shadow:0 24px 60px -24px #000c;font-family:var(--mono);font-size:.82rem}
.term-bar{display:flex;align-items:center;gap:7px;padding:11px 16px;
  border-bottom:1px solid var(--border);color:var(--faint);font-size:.75rem}
.term-bar i{width:11px;height:11px;border-radius:50%;background:var(--border-strong);display:inline-block}
.term-bar i:first-child{background:#3a4d40}
.term-body{padding:18px 20px;line-height:1.75;overflow-x:auto}
.term-body .p{color:var(--faint)}          /* prompt $ */
.term-body .c{color:#B9C4BB}               /* command */
.term-body .f{color:var(--accent)}         /* flags/keys */
.term-body .s{color:var(--ok)}             /* strings/output */
.term-body .vn{color:var(--text)}          /* vietnamese output */

/* measured-numbers strip */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));
  border:1px solid var(--border);border-radius:14px;overflow:hidden;margin:8px 0 30px;
  background:var(--bg-raise)}
.stats>div{padding:20px 24px;border-left:1px solid var(--border)}
.stats>div:first-child{border-left:none}
.stats b{display:block;font-family:var(--mono);font-size:1.45rem;font-weight:700;color:var(--text)}
.stats span{color:var(--muted);font-size:.85rem}

/* sections */
.section{margin:72px 0}
.section>h2{font-size:1.65rem;font-weight:700;letter-spacing:-.02em;margin-bottom:8px}
.section>.sub{color:var(--muted);max-width:60ch;margin-bottom:30px}

/* steps — real sequence, numbering justified */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:0;
  border:1px solid var(--border);border-radius:14px;overflow:hidden}
.steps>div{padding:26px 26px 30px;border-left:1px solid var(--border);background:var(--panel)}
.steps>div:first-child{border-left:none}
.steps .n{font-family:var(--mono);color:var(--accent);font-size:.8rem;display:block;margin-bottom:12px}
.steps h3{font-size:1.02rem;margin-bottom:6px}
.steps p{color:var(--muted);font-size:.92rem}

/* asymmetric feature layout: one wide + column of three */
.feat{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,5fr);gap:18px}
.feat-main{background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:30px}
.feat-main h3{font-size:1.2rem;margin-bottom:8px}
.feat-main p{color:var(--muted);max-width:52ch}
.feat-main .mini-table{margin-top:22px;font-family:var(--mono);font-size:.8rem;color:var(--muted)}
.feat-main .mini-table div{display:flex;justify-content:space-between;gap:12px;
  padding:9px 2px;border-top:1px solid var(--border)}
.feat-main .mini-table b{color:var(--text);font-weight:500}
.feat-side{display:flex;flex-direction:column;gap:18px}
.feat-side>div{background:var(--bg-raise);border:1px solid var(--border);border-radius:14px;
  padding:20px 22px;flex:1}
.feat-side h3{font-size:.98rem;margin-bottom:4px}
.feat-side p{color:var(--muted);font-size:.9rem}

/* code blocks */
pre{background:var(--code-bg);border:1px solid var(--border);border-radius:14px;
  padding:20px 22px;overflow-x:auto;font-size:.84rem;line-height:1.7;margin:16px 0}
code{font-family:var(--mono);color:#C8D4C9}
pre .f{color:var(--accent)} pre .s{color:var(--ok)} pre .cm{color:var(--faint)}
p code,li code,td code{background:var(--panel-2);border:1px solid var(--border);
  padding:1px 7px;border-radius:6px;font-size:.85em;color:var(--text)}

/* CTA band */
.band{border:1px solid var(--border-strong);border-radius:14px;background:var(--panel);
  padding:44px 40px;display:flex;justify-content:space-between;align-items:center;
  gap:24px;flex-wrap:wrap;margin:80px 0 20px}
.band h2{font-size:1.5rem;letter-spacing:-.02em}
.band p{color:var(--muted);margin-top:4px}

/* ---------- forms ---------- */
.form-box{max-width:420px;margin:48px auto;background:var(--panel);
  border:1px solid var(--border);border-radius:14px;padding:36px}
.form-box h2{margin-bottom:4px;font-size:1.35rem;letter-spacing:-.02em}
.form-box .form-sub{color:var(--muted);font-size:.9rem;margin-bottom:18px}
.form-box label{display:block;margin:16px 0 6px;color:var(--muted);font-size:.87rem;font-weight:500}
.form-box input{width:100%;padding:11px 14px;border-radius:10px;border:1px solid var(--border-strong);
  background:var(--bg);color:var(--text);font-size:.97rem;font-family:var(--font)}
.form-box input:focus{outline:none;border-color:var(--accent)}
.form-box input::placeholder{color:var(--faint)}
.form-box .btn{width:100%;justify-content:center;margin-top:24px}
.form-box .alt{text-align:center;margin-top:18px;color:var(--muted);font-size:.88rem}

/* ---------- alerts: left rule, no emoji ---------- */
.alert{padding:13px 18px;border-radius:10px;margin:16px 0;font-size:.92rem;
  border:1px solid var(--border);border-left:3px solid var(--muted);background:var(--bg-raise)}
.alert-error{border-left-color:var(--err);color:#F0B7AE}
.alert-warn{border-left-color:var(--warn);color:#EBD9A3}
.alert-ok{border-left-color:var(--ok);color:#B5E3CC}

/* ---------- tables ---------- */
.table-wrap{overflow-x:auto;background:var(--panel);border:1px solid var(--border);
  border-radius:14px;padding:4px 18px 10px;margin:16px 0}
table{width:100%;border-collapse:collapse;font-size:.9rem}
th,td{text-align:left;padding:11px 12px;border-bottom:1px solid var(--border);vertical-align:top}
tr:last-child td{border-bottom:none}
th{color:var(--faint);font-weight:600;font-size:.76rem;text-transform:uppercase;
  letter-spacing:.08em;font-family:var(--mono)}
td b{font-weight:600}
.num{font-family:var(--mono);font-size:.86rem}

/* status badges */
.badge{display:inline-block;padding:2px 12px;border-radius:999px;font-size:.76rem;
  font-weight:600;font-family:var(--mono);border:1px solid;
  white-space:nowrap;line-height:1.6;vertical-align:middle}
.badge-approved{color:var(--ok);border-color:var(--ok);background:#69c79714}
.badge-pending{color:var(--warn);border-color:var(--warn);background:#e0c06714}
.badge-blocked{color:var(--err);border-color:var(--err);background:#e07b6b14}

/* ---------- dashboard ---------- */
.page-title{font-size:1.55rem;letter-spacing:-.02em;margin-bottom:4px}
.sub{color:var(--muted);margin-bottom:24px}
.tiles{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px;margin:22px 0}
.tile{background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:20px 22px}
.tile span{color:var(--muted);font-size:.84rem}
.tile b{display:block;font-family:var(--mono);font-size:1.6rem;font-weight:700;margin-top:2px}
.tile small{color:var(--faint);font-size:.8rem}

.key-box{display:block;background:var(--code-bg);border:1px dashed var(--border-strong);
  border-radius:10px;padding:14px 16px;margin:12px 0;
  font-family:var(--mono);font-size:.86rem;word-break:break-all;color:var(--accent)}
.section-title{margin:38px 0 12px;font-size:1.15rem;letter-spacing:-.01em}

/* progress bar cho campaign */
.progress{height:8px;background:var(--panel-2);border-radius:999px;overflow:hidden;margin:8px 0}
.progress i{display:block;height:100%;background:var(--accent);border-radius:999px}
.checks{display:flex;gap:20px;flex-wrap:wrap;margin:12px 0}
.checks label{display:flex;gap:8px;align-items:center;color:var(--muted);font-size:.92rem;cursor:pointer}
.site-pick{border:1px solid var(--border);border-radius:10px;padding:12px 16px;margin:8px 0;
  display:flex;gap:14px;align-items:center;flex-wrap:wrap}
.site-pick select{padding:6px 10px;border-radius:8px;border:1px solid var(--border-strong);
  background:var(--bg);color:var(--text);font-size:.86rem}
textarea{width:100%;padding:12px 14px;border-radius:10px;border:1px solid var(--border-strong);
  background:var(--bg);color:var(--text);font-size:.93rem;font-family:var(--mono);
  min-height:130px;resize:vertical}
textarea:focus{outline:none;border-color:var(--accent)}
.form-wide{background:var(--panel);border:1px solid var(--border);border-radius:14px;
  padding:28px;margin:18px 0}
.form-wide h3{margin-bottom:4px}
.form-wide .form-sub{color:var(--muted);font-size:.88rem;margin-bottom:10px}
.form-wide label{display:block;margin:16px 0 6px;color:var(--muted);font-size:.87rem;font-weight:500}
.form-wide input[type=text],.form-wide input[type=url],.form-wide input[type=password],
.form-wide input[type=number],.form-wide select{
  width:100%;padding:10px 13px;border-radius:10px;
  border:1px solid var(--border-strong);background:var(--bg);color:var(--text);font-size:.95rem}
.form-wide input:focus,.form-wide select:focus{outline:none;border-color:var(--accent)}
.form-wide input::placeholder,textarea::placeholder{color:var(--faint)}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 22px}
@media (max-width:700px){.form-grid{grid-template-columns:1fr}}
.hint{color:var(--faint);font-size:.82rem;margin-top:5px;line-height:1.5}
.hint code{font-size:.9em}
.help-steps{background:var(--bg-raise);border:1px solid var(--border);border-radius:10px;
  padding:14px 18px;margin:14px 0;font-size:.88rem;color:var(--muted)}
.help-steps b{color:var(--text)}

/* admin inline forms */
.inline-form{display:inline-flex;gap:6px;align-items:center;margin:3px 6px 3px 0}
.inline-form input[type=number]{width:110px;padding:6px 10px;border-radius:10px;
  border:1px solid var(--border-strong);background:var(--bg);color:var(--text);
  font-family:var(--mono);font-size:.84rem}
.inline-form select{padding:6px 10px;border-radius:10px;border:1px solid var(--border-strong);
  background:var(--bg);color:var(--text);font-size:.84rem}

/* admin: khu sửa/xóa user */
.edit-box{margin-top:6px}
.edit-box summary{cursor:pointer;color:var(--muted);font-size:.82rem;user-select:none}
.edit-box summary:hover{color:var(--accent)}
.edit-box form{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0;align-items:center}
.edit-box input{padding:6px 10px;border-radius:8px;border:1px solid var(--border-strong);
  background:var(--bg);color:var(--text);font-size:.84rem;min-width:200px}
.edit-box input:focus{outline:none;border-color:var(--accent)}

/* ---------- docs ---------- */
.docs-grid{display:grid;grid-template-columns:220px minmax(0,1fr);gap:48px;align-items:start}
.docs-toc{position:sticky;top:88px;border-left:1px solid var(--border);padding-left:18px}
.docs-toc b{display:block;font-family:var(--mono);font-size:.72rem;text-transform:uppercase;
  letter-spacing:.1em;color:var(--faint);margin-bottom:10px}
.docs-toc a{display:block;padding:4px 0;color:var(--muted);font-size:.88rem}
.docs-toc a:hover{color:var(--accent);text-decoration:none}
.docs h2{font-size:1.3rem;letter-spacing:-.01em;margin:46px 0 12px;padding-top:18px;
  border-top:1px solid var(--border)}
.docs h2:first-of-type{border-top:none;margin-top:10px;padding-top:0}
.docs h3{margin:26px 0 8px;font-size:1rem}
.docs h3 code{color:var(--accent);background:var(--accent-soft);border-color:transparent}
.docs ul{margin:10px 0 10px 22px;color:var(--muted)}
.docs li{margin:5px 0}
.docs p{margin:10px 0;color:var(--muted)}
.docs p b,.docs li b{color:var(--text)}

/* entrance motion — single orchestrated moment on landing hero */
@media (prefers-reduced-motion:no-preference){
  .rise{opacity:0;transform:translateY(14px);animation:rise .6s cubic-bezier(.16,1,.3,1) forwards}
  .rise.d1{animation-delay:.08s}.rise.d2{animation-delay:.16s}.rise.d3{animation-delay:.24s}
  @keyframes rise{to{opacity:1;transform:none}}
}

/* ---------- responsive ---------- */
@media (max-width:900px){
  .hero{grid-template-columns:1fr;gap:36px;padding:40px 0 48px}
  .feat{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr}
  .steps>div{border-left:none;border-top:1px solid var(--border)}
  .steps>div:first-child{border-top:none}
  .docs-grid{grid-template-columns:1fr}
  .docs-toc{position:static;border-left:none;padding-left:0;
    border-bottom:1px solid var(--border);padding-bottom:14px}
  .stats>div{border-left:none;border-top:1px solid var(--border)}
  .stats>div:first-child{border-top:none}
}
@media (max-width:560px){
  .nav{padding:0 16px}
  .nav-links{gap:14px}
  .nav-links a:not(.btn){display:none}
  .container{padding:28px 16px}
  .band{padding:30px 24px}
}