/* ===========================
   TrendReward Global Styles
   Author: ChatGPT (Em Tiền)
   Notes:
   - System font stack for speed
   - Mobile-first; small JS only for nav toggle
   - Utility classes for spacing/visibility
   =========================== */

/* ---------- CSS Variables ---------- */
:root{
  --bg: #0b0e13;              /* dark ink */
  --bg-alt: #0f141c;           /* card/alt section */
  --surface: #121826;          /* surfaces */
  --border: #1f2a3b;
  --text: #e7edf7;
  --muted: #9fb0c9;
  --accent: #ff8a3d;           /* primary accent (warm) */
  --accent-2: #66e0d6;         /* secondary accent (mint) */
  --link: #8ab4ff;
  --shadow: 0 8px 32px rgba(0,0,0,.35);
  --radius: 16px;
  --radius-sm: 12px;
  --radius-lg: 22px;
  --container: 1160px;
}

/* ---------- Reset / Base ---------- */
*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0; color:var(--text); background:linear-gradient(180deg,var(--bg) 0%, #0c1017 100%);
  font: 400 16px/1.6 system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
}
img{ max-width:100%; display:block; }
a{ color:var(--link); text-decoration:none; }
a:hover{ text-decoration:underline; }
h1,h2,h3{ line-height:1.25; margin:0 0 .5rem; }
h1{ font-size:clamp(28px, 4vw, 44px); letter-spacing:.2px; }
h2{ font-size:clamp(22px, 2.6vw, 30px); }
h3{ font-size:clamp(18px, 2vw, 22px); }
p{ margin:.5rem 0 1rem; }
.lead{ color:#eaf2ff; font-size:clamp(16px,2.2vw,18px); opacity:.95; }
.muted{ color:var(--muted); }
.tiny-note{ color:var(--muted); font-size:12.5px; }
.badge{
  display:inline-block; font-size:12px; padding:.25rem .5rem; border-radius:999px;
  background:rgba(255,255,255,.06); border:1px solid var(--border); color:var(--muted);
}

/* ---------- Layout ---------- */
.container{
  width:100%; max-width:var(--container); margin:0 auto; padding:0 16px;
}
.section{ padding:64px 0; }
.section--alt{ background:var(--bg-alt); box-shadow: inset 0 1px 0 rgba(255,255,255,.03), inset 0 -1px 0 rgba(0,0,0,.25); }
.section__intro{ color:var(--muted); max-width:920px; }

/* ---------- Header / Nav ---------- */
.site-header{
  position:sticky; top:0; z-index:40; backdrop-filter:saturate(160%) blur(8px);
  background:rgba(10,14,20,.7); border-bottom:1px solid rgba(255,255,255,.04);
}
.header__inner{ display:flex; align-items:center; justify-content:space-between; padding:14px 0; gap:14px; }
.brand img{ filter: drop-shadow(0 0 0 rgba(0,0,0,0)); }

.nav__toggle{
  display:inline-flex; align-items:center; gap:8px; padding:.55rem .8rem;
  background:transparent; color:var(--text); border:1px solid var(--border); border-radius:10px;
}
.nav__list{
  list-style:none; margin:0; padding:0; display:flex; align-items:center; gap:18px;
}
.nav__list a{ color:var(--text); opacity:.92; }
.nav__list a:hover{ opacity:1; }
.nav__cta .btn{ padding:.55rem .9rem; }

@media (max-width: 920px){
  .nav__toggle{ display:inline-flex; }
  .nav__list{ 
    position:absolute; right:16px; top:60px; flex-direction:column; align-items:flex-start;
    background:var(--surface); border:1px solid var(--border); border-radius:14px; padding:12px;
    width:min(86vw, 320px); box-shadow:var(--shadow); display:none;
  }
  .nav__list.is-open, .nav__list.is-open{ display:flex; }
}
@media (min-width: 921px){
  .nav__toggle{ display:none; }
}

/* ---------- Buttons ---------- */
.btn{
  --btn-bg: var(--accent);
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  font-weight:600; border-radius:12px; padding:.8rem 1.05rem; border:0; cursor:pointer;
  color:#0b0e13; background:var(--btn-bg); box-shadow:0 6px 16px rgba(255,138,61,.25);
  transition: transform .08s ease, box-shadow .18s ease, background .2s ease;
}
.btn:hover{ text-decoration:none; transform: translateY(-1px); box-shadow:0 10px 24px rgba(255,138,61,.33); }
.btn--ghost{
  --btn-bg: transparent; color:var(--text); border:1px solid var(--border); box-shadow:none;
}
.btn--ghost:hover{ background:rgba(255,255,255,.04); }
.btn--lg{ padding:1rem 1.2rem; font-size:17px; }
.btn--primary{ --btn-bg: var(--accent); color:#111; }

/* ---------- Hero ---------- */
.hero{ padding:64px 0 48px; }
.hero__grid{
  display:grid; grid-template-columns: 1.1fr .9fr; gap:32px; align-items:center;
}
.hero__cta{ display:flex; flex-wrap:wrap; gap:12px; margin:14px 0 6px; }
.hero__media{ margin:0; }
.img-ph--hero{ height:320px; }

@media (max-width: 960px){
  .hero__grid{ grid-template-columns: 1fr; }
}

/* ---------- Image Placeholders ---------- */
.img-ph{
  display:grid; place-items:center; text-align:center; color:var(--muted);
  border:1px dashed var(--border); border-radius:var(--radius); background:rgba(255,255,255,.02);
  min-height:180px; padding:16px;
}
.img-ph--logos{ min-height:80px; }

/* ---------- Cards / Grids ---------- */
.cards--grid{
  display:grid; gap:18px;
  grid-template-columns: repeat(12, 1fr);
}
.card{
  grid-column: span 6;
  display:flex; flex-direction:column; background:var(--surface);
  border:1px solid var(--border); border-radius:var(--radius); overflow:hidden;
  transition:transform .08s ease, box-shadow .18s ease, border-color .18s ease;
}
.card:hover{ transform:translateY(-2px); box-shadow:var(--shadow); border-color:rgba(255,255,255,.08); }
.card__media{ display:block; background:rgba(255,255,255,.02); }
.card__body{ padding:16px; }
.card__title a{ color:#eaf2ff; }
.card__text{ color:var(--muted); }
.card__link{ display:inline-flex; gap:6px; align-items:center; margin-top:6px; }

.card--ghost{ opacity:.9; }
.card--ghost .badge{ background:rgba(102,224,214,.12); border-color:rgba(102,224,214,.35); color:var(--accent-2); }

@media (max-width: 960px){
  .card{ grid-column: span 12; }
}

/* ---------- Benefits ---------- */
.benefits{
  display:grid; gap:18px; grid-template-columns: repeat(12, 1fr); margin-top:14px;
}
.benefit{
  grid-column: span 6; background:var(--surface); border:1px solid var(--border);
  border-radius:var(--radius); padding:16px;
}
@media (max-width: 960px){
  .benefit{ grid-column: span 12; }
}

/* ---------- Logo Row ---------- */
.logo-row{ margin-top:18px; }
.logo-row .img-ph{ border-style:solid; }

/* ---------- Two / Three Column Grids ---------- */
.grid-2{ display:grid; gap:22px; grid-template-columns: 1fr 1fr; }
.grid-3{ display:grid; gap:18px; grid-template-columns: repeat(3, 1fr); }
@media (max-width: 900px){
  .grid-2{ grid-template-columns: 1fr; }
  .grid-3{ grid-template-columns: 1fr; }
}

/* ---------- Lists ---------- */
.checklist, .bullets, .metrics{
  margin:0 0 14px; padding-left:0; list-style:none; color:var(--text);
}
.checklist li, .bullets li, .metrics li{
  position:relative; padding-left:26px; margin:8px 0; color:var(--muted);
}
.checklist li::before{
  content:"✓"; position:absolute; left:0; top:0; color:var(--accent-2);
}
.bullets li::before{
  content:"•"; position:absolute; left:4px; top:0; color:var(--accent);
}

/* ---------- KPI Cards ---------- */
.kpis{ display:grid; grid-template-columns: repeat(4, 1fr); gap:12px; margin-top:10px; }
.kpi{
  background:var(--surface); border:1px solid var(--border); border-radius:12px; padding:12px;
}
.kpi__label{ display:block; color:var(--muted); font-size:12px; }
.kpi__val{ font-weight:700; font-size:18px; }

@media (max-width: 780px){
  .kpis{ grid-template-columns: repeat(2, 1fr); }
}

/* ---------- Tiles (Tech Section) ---------- */
.tile{
  background:var(--surface); border:1px solid var(--border); border-radius:var(--radius);
  padding:16px; height:100%;
}

/* ---------- CTA Row ---------- */
.cta-row{ display:flex; gap:12px; flex-wrap:wrap; margin-top:14px; }

/* ---------- Contact Box ---------- */
.contact-box{
  display:grid; grid-template-columns: 1.2fr .8fr; gap:18px;
  background:var(--surface); border:1px solid var(--border); border-radius:var(--radius);
  padding:18px;
}
.contact-box__cta p{ margin:.5rem 0 0; }
@media (max-width: 900px){
  .contact-box{ grid-template-columns: 1fr; }
}

/* ---------- Footer ---------- */
.site-footer{
  margin-top:34px; border-top:1px solid rgba(255,255,255,.06); background:rgba(10,14,20,.6);
}
.footer__grid{
  display:grid; grid-template-columns: 1.2fr 1fr 1fr; gap:18px; padding:24px 0;
}
.footer__links ul{ list-style:none; margin:0; padding:0; }
.footer__links li{ margin:6px 0; }
.footer__brand img{ opacity:.95; }
.disclosure{ margin:.5rem 0; }
.footer__cta .btn{ margin-bottom:8px; }
@media (max-width: 900px){
  .footer__grid{ grid-template-columns: 1fr; }
}

/* ---------- Helpers ---------- */
.header-spacer{ height:64px; }
.img-ph--hero{ min-height:320px; }
.img-ph--sm{ min-height:120px; }

.hidden{ display:none !important; }
.center{ text-align:center; }
.maxw-760{ max-width:760px; }

/* ---------- Smooth focus styles ---------- */
:focus-visible{
  outline:2px solid var(--accent-2); outline-offset:3px; border-radius:8px;
}

/* ---------- Tables (if any future use) ---------- */
table{ width:100%; border-collapse:collapse; }
th,td{ padding:10px 12px; border-bottom:1px solid var(--border); }
th{ text-align:left; color:#dfe9ff; }

/* ---------- Small view polish ---------- */
@media (max-width: 400px){
  .btn{ width:100%; }
  .hero__cta{ gap:10px; }
}