/* ============================================================
   KHOI AN TECHNOLOGY — SafeDrop water systems
   Design tokens + shared components
   Derived from logo: tech blue (K) + steel gray, white ground
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:ital,wght@0,400;0,500;0,600;0,700;0,800;1,500&family=Barlow+Semi+Condensed:wght@600;700&display=swap');

:root{
  /* --- Brand palette (sampled from logo) --- */
  --navy:      #0e3a5f;   /* deepest — footer, headings */
  --blue-800:  #103f6b;
  --blue-700:  #134f86;
  --blue:      #1668a8;   /* PRIMARY — the K */
  --blue-500:  #2076b8;
  --blue-400:  #4193cf;
  --blue-200:  #b6d6ee;
  --cyan:      #149fc4;   /* water accent */
  --cyan-soft: #e2f4f9;

  --steel:     #9aa3ab;   /* logo gray */
  --steel-700: #5f6b75;

  /* --- Neutrals (cool-tinted) --- */
  --ink:       #15212c;
  --muted:     #5b6a76;
  --line:      #e3eaf0;
  --line-soft: #eef3f7;
  --bg:        #ffffff;
  --bg-soft:   #f4f8fb;
  --bg-blue:   #eaf3fb;
  --white:     #ffffff;

  /* --- Status --- */
  --ok:        #1e9e6a;
  --warn:      #e0892a;
  --hot:       #d83b3b;   /* price / sale */

  /* --- Type --- */
  --font:  'Be Vietnam Pro', system-ui, sans-serif;
  --font-cond: 'Barlow Semi Condensed', var(--font);

  /* --- Radius --- */
  --r-xs: 6px;
  --r-sm: 10px;
  --r-md: 14px;
  --r-lg: 20px;
  --r-xl: 28px;
  --r-pill: 999px;

  /* --- Shadow (cool blue-tinted) --- */
  --sh-sm: 0 1px 2px rgba(16,63,107,.06), 0 1px 3px rgba(16,63,107,.05);
  --sh-md: 0 6px 18px rgba(16,63,107,.08), 0 2px 6px rgba(16,63,107,.05);
  --sh-lg: 0 18px 44px rgba(16,63,107,.12), 0 6px 14px rgba(16,63,107,.07);
  --sh-blue: 0 14px 30px rgba(22,104,168,.28);

  /* --- Layout --- */
  --maxw: 1200px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font);
  color:var(--ink);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  line-height:1.55;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer}
h1,h2,h3,h4{margin:0;line-height:1.12;letter-spacing:-.01em;color:var(--navy);font-weight:800}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ---------- Eyebrow / section heads ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;
  color:var(--blue);
}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--cyan);border-radius:2px}
.sec-title{font-size:clamp(26px,3.4vw,40px);margin:14px 0 0}
.sec-sub{color:var(--muted);font-size:17px;max-width:60ch;margin:12px 0 0}

/* ---------- Buttons ---------- */
.btn{
  --bg:var(--blue);--fg:#fff;
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  padding:13px 22px;border-radius:var(--r-pill);border:0;
  background:var(--bg);color:var(--fg);
  font-weight:700;font-size:15px;letter-spacing:.01em;
  transition:transform .15s ease, box-shadow .2s ease, background .2s ease;
  white-space:nowrap;
}
.btn:hover{transform:translateY(-2px)}
.btn--primary{background:linear-gradient(135deg,var(--blue) 0%,var(--blue-700) 100%);box-shadow:var(--sh-blue)}
.btn--primary:hover{box-shadow:0 18px 36px rgba(22,104,168,.38)}
.btn--cyan{background:linear-gradient(135deg,var(--cyan) 0%,#0e84a6 100%);box-shadow:0 12px 26px rgba(20,159,196,.3)}
.btn--ghost{background:#fff;color:var(--blue);border:1.5px solid var(--blue-200)}
.btn--ghost:hover{border-color:var(--blue);background:var(--bg-blue)}
.btn--dark{background:var(--navy)}
.btn--lg{padding:16px 30px;font-size:16px}
.btn--block{width:100%}

/* ---------- Badges / chips ---------- */
.badge{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 12px;border-radius:var(--r-pill);
  font-size:12.5px;font-weight:700;letter-spacing:.02em;
}
.badge--auth{background:var(--cyan-soft);color:#0e84a6}
.badge--nsf{background:#eef3f9;color:var(--blue-700)}
.badge--gift{background:#fde7e7;color:var(--hot)}
.badge--soft{background:var(--bg-blue);color:var(--blue-700)}
.badge--ink{background:var(--navy);color:#fff}
.badge--ok{background:#e7f5ee;color:var(--ok)}

.chip{
  display:inline-flex;align-items:center;gap:7px;
  padding:9px 16px;border-radius:var(--r-pill);
  border:1.5px solid var(--line);background:#fff;color:var(--steel-700);
  font-size:14px;font-weight:600;transition:all .18s ease;
}
.chip:hover{border-color:var(--blue-200);color:var(--blue)}
.chip.is-active{background:var(--blue);border-color:var(--blue);color:#fff;box-shadow:var(--sh-blue)}

/* ---------- Card ---------- */
.card{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--sh-sm)}

/* ---------- Utility ---------- */
.tag-dot{width:7px;height:7px;border-radius:50%;background:var(--cyan);display:inline-block}
.divider{height:1px;background:var(--line);border:0;margin:0}
.muted{color:var(--muted)}
.hide{display:none!important}