/* ===========================================================
   Runway AI Reseller – Guest UI
   Palette (Ất Sửu 1985 – Hải Trung Kim):
     --navy    #0B1220   nền chủ đạo (Thủy tương sinh Kim)
     --ink     #1A2436   nền phụ
     --gold    #C9A45C   nhấn kim loại (Kim bản mệnh)
     --gold-2  #E7C989   sáng
     --bronze  #8B6E4E   nâu đồng (Thổ sinh Kim)
     --cream   #F5EFE1   chữ nhạt / bảng sáng
     --line    rgba(201,164,92,.18)
   =========================================================== */

:root{
  --navy:#0B1220;
  --ink:#1A2436;
  --ink-2:#111A2A;
  --gold:#C9A45C;
  --gold-2:#E7C989;
  --bronze:#8B6E4E;
  --cream:#F5EFE1;
  --muted:#9AA3B2;
  --line:rgba(201,164,92,.18);
  --line-strong:rgba(201,164,92,.35);
  --shadow:0 20px 60px -20px rgba(0,0,0,.6);
  --radius:14px;
  --radius-lg:22px;
  --font-serif:"Cormorant Garamond","Noto Serif",Georgia,serif;
  --font-sans:"Inter","Be Vietnam Pro",system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:
    radial-gradient(1200px 700px at 85% -10%, rgba(201,164,92,.10), transparent 60%),
    radial-gradient(900px 600px at -5% 20%, rgba(139,110,78,.10), transparent 55%),
    linear-gradient(180deg,#080D18 0%, #0B1220 40%, #0B1220 100%);
  color:var(--cream);
  font-family:var(--font-sans);
  font-size:15px;
  line-height:1.6;
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
}

a{color:var(--gold-2);text-decoration:none}
a:hover{color:var(--gold)}
img{max-width:100%;display:block}
h1,h2,h3,h4{font-family:var(--font-serif);color:var(--cream);font-weight:600;letter-spacing:.2px;margin:0 0 .6em}
h1{font-size:clamp(2.2rem,4.2vw,3.6rem);line-height:1.1}
h2{font-size:clamp(1.6rem,2.6vw,2.2rem)}
h3{font-size:1.2rem}
p{margin:0 0 1em;color:#CBD3E1}
.container{max-width:1200px;margin:0 auto;padding:0 24px}

/* ---------- NAVBAR ---------- */
.nav{
  position:sticky;top:0;z-index:50;
  backdrop-filter:blur(14px);
  background:linear-gradient(180deg,rgba(11,18,32,.85),rgba(11,18,32,.55));
  border-bottom:1px solid var(--line);
}
.nav-inner{
  display:flex;align-items:center;justify-content:space-between;
  height:72px;
}
.brand{display:flex;align-items:center;gap:10px;color:var(--cream);font-family:var(--font-serif);font-size:1.35rem;letter-spacing:.5px}
.brand-mark{
  width:40px;height:40px;
  background:url("logo/ai-api-mark.svg") center/contain no-repeat;
  filter:drop-shadow(0 4px 12px rgba(201,164,92,.35));
  flex-shrink:0;
}
.brand em{color:var(--gold-2);font-style:normal;font-weight:600;margin-left:2px;letter-spacing:1px}
.nav-links{display:flex;gap:26px;align-items:center}
.nav-links a{color:#DDE4EF;font-size:.95rem}
.nav-links a.active,.nav-links a:hover{color:var(--gold-2)}
.nav-cta{display:flex;gap:10px;align-items:center}

/* ---------- BUTTONS ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 20px;border-radius:999px;font-weight:600;font-size:.9rem;
  border:1px solid transparent;cursor:pointer;transition:all .2s ease;
  letter-spacing:.3px;
}
.btn-ghost{color:var(--cream);border-color:var(--line-strong);background:transparent}
.btn-ghost:hover{border-color:var(--gold);color:var(--gold-2)}
.btn-primary{
  color:#0B1220;
  background:linear-gradient(135deg,var(--gold-2) 0%,var(--gold) 60%,var(--bronze) 130%);
  box-shadow:0 10px 24px -10px rgba(201,164,92,.7);
}
.btn-primary:hover{filter:brightness(1.05);transform:translateY(-1px)}
.btn-outline{color:var(--gold-2);border-color:var(--gold);background:rgba(201,164,92,.06)}
.btn-outline:hover{background:rgba(201,164,92,.14)}
.btn-lg{padding:14px 28px;font-size:1rem}

/* ---------- HERO ---------- */
.hero{padding:80px 0 60px;position:relative;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:60px;align-items:center}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  padding:6px 14px;border-radius:999px;
  background:rgba(201,164,92,.08);border:1px solid var(--line-strong);
  color:var(--gold-2);font-size:.8rem;letter-spacing:1.4px;text-transform:uppercase;
  margin-bottom:22px;
}
.eyebrow .dot{width:6px;height:6px;border-radius:50%;background:var(--gold);box-shadow:0 0 10px var(--gold)}
.hero h1 em{font-style:italic;color:var(--gold-2);font-weight:500}
.hero p.lead{font-size:1.1rem;color:#CBD3E1;max-width:560px}
.hero-actions{display:flex;gap:14px;margin-top:28px;flex-wrap:wrap}
.hero-stats{display:flex;gap:38px;margin-top:44px;padding-top:26px;border-top:1px solid var(--line)}
.hero-stats .s-num{font-family:var(--font-serif);font-size:1.8rem;color:var(--gold-2);line-height:1}
.hero-stats .s-lbl{font-size:.8rem;color:var(--muted);letter-spacing:1px;text-transform:uppercase;margin-top:6px}

/* Decorative preview card */
.preview{
  position:relative;border-radius:var(--radius-lg);overflow:hidden;
  background:linear-gradient(160deg,#141E33 0%,#0B1220 100%);
  border:1px solid var(--line-strong);box-shadow:var(--shadow);
  aspect-ratio: 4/5;
}
.preview::before{
  content:"";position:absolute;inset:0;
  background:
    radial-gradient(600px 300px at 20% 10%,rgba(201,164,92,.25),transparent 60%),
    radial-gradient(400px 400px at 90% 90%,rgba(139,110,78,.35),transparent 60%);
}
.preview-content{position:relative;padding:26px;height:100%;display:flex;flex-direction:column;justify-content:space-between;z-index:2}
.preview-chip{
  align-self:flex-start;font-size:.72rem;letter-spacing:1.5px;text-transform:uppercase;
  color:var(--gold-2);padding:5px 12px;border:1px solid var(--line-strong);border-radius:999px;
  background:rgba(0,0,0,.35);
}
.preview-title{font-family:var(--font-serif);font-size:1.6rem;color:var(--cream);margin:0}
.preview-meta{display:flex;justify-content:space-between;font-size:.82rem;color:#B7C0CE;margin-top:14px}
.preview-orb{
  position:absolute;left:50%;top:52%;transform:translate(-50%,-50%);
  width:60%;aspect-ratio:1;border-radius:50%;
  background:conic-gradient(from 210deg,#C9A45C,#8B6E4E,#0B1220,#E7C989,#C9A45C);
  filter:blur(1px);
  box-shadow:0 40px 120px -20px rgba(201,164,92,.4);
  animation:spin 26s linear infinite;
  opacity:.85;
}
.preview-orb::after{
  content:"";position:absolute;inset:14%;border-radius:50%;
  background:radial-gradient(circle at 30% 30%,#F5EFE1,#8B6E4E 55%,#0B1220);
  mix-blend-mode:overlay;
}
@keyframes spin{to{transform:translate(-50%,-50%) rotate(1turn)}}

/* ---------- SECTIONS ---------- */
section{padding:80px 0}
.section-head{max-width:720px;margin:0 auto 48px;text-align:center}
.section-head .eyebrow{margin-bottom:14px}
.section-head p{color:#B7C0CE}

/* ---------- FEATURE GRID ---------- */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.card{
  background:linear-gradient(180deg,rgba(26,36,54,.7),rgba(17,26,42,.7));
  border:1px solid var(--line);border-radius:var(--radius);
  padding:26px;transition:all .25s ease;
  position:relative;overflow:hidden;
}
.card:hover{border-color:var(--line-strong);transform:translateY(-3px);box-shadow:var(--shadow)}
.card .ico{
  width:44px;height:44px;border-radius:12px;
  background:linear-gradient(135deg,rgba(201,164,92,.2),rgba(139,110,78,.1));
  border:1px solid var(--line-strong);
  display:grid;place-items:center;color:var(--gold-2);font-family:var(--font-serif);font-size:1.15rem;
  margin-bottom:18px;
}
.card h3{margin-bottom:8px}
.card p{font-size:.92rem;color:#B7C0CE;margin:0}

/* ---------- MODEL CATALOG ---------- */
.filters{
  display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-bottom:36px;
}
.chip{
  padding:8px 16px;border-radius:999px;font-size:.85rem;
  border:1px solid var(--line);color:#CBD3E1;background:rgba(26,36,54,.5);cursor:pointer;
  transition:all .2s;
}
.chip:hover{border-color:var(--gold);color:var(--gold-2)}
.chip.on{background:linear-gradient(135deg,var(--gold-2),var(--gold));color:#0B1220;border-color:transparent;font-weight:600}

.model-card{
  display:flex;flex-direction:column;
  background:linear-gradient(180deg,#131C30 0%,#0E1626 100%);
  border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  transition:all .25s;
}
.model-card:hover{border-color:var(--gold);transform:translateY(-4px);box-shadow:var(--shadow)}
.model-cover{
  aspect-ratio:16/10;position:relative;
  background:linear-gradient(135deg,#1A2540,#0B1220);
  display:grid;place-items:center;overflow:hidden;
}
.model-cover .cover-img{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;
}
.model-cover::after{
  content:"";position:absolute;inset:0;pointer-events:none;z-index:0;
  background:linear-gradient(180deg,rgba(11,18,32,.12),rgba(11,18,32,.55));
}
.model-cover .abstract{
  position:absolute;inset:0;
  background:
    radial-gradient(circle at 30% 30%,rgba(201,164,92,.35),transparent 55%),
    radial-gradient(circle at 70% 70%,rgba(139,110,78,.45),transparent 60%),
    linear-gradient(120deg,transparent 60%,rgba(231,201,137,.15));
}
.model-cover .tag{
  position:absolute;top:14px;left:14px;z-index:1;
  background:rgba(11,18,32,.75);border:1px solid var(--line-strong);
  color:var(--gold-2);font-size:.72rem;padding:4px 10px;border-radius:999px;
  letter-spacing:1px;text-transform:uppercase;
}
.model-cover .id{
  position:absolute;bottom:14px;right:14px;z-index:1;
  color:#8B98AE;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.78rem;
  background:rgba(0,0,0,.4);padding:3px 8px;border-radius:6px;
}
.model-body{padding:20px 22px 24px}
.model-body h3{font-size:1.15rem;margin-bottom:6px}
.model-body .desc{font-size:.9rem;color:#B7C0CE;min-height:56px}
.model-strengths{
  list-style:none;padding:0;margin:10px 0 0;
  display:flex;flex-wrap:wrap;gap:6px;
}
.model-strengths li{
  font-size:.72rem;color:var(--gold-2);
  border:1px solid var(--line);padding:3px 8px;border-radius:999px;
}
.model-meta{display:flex;justify-content:space-between;align-items:center;margin-top:16px;padding-top:14px;border-top:1px dashed var(--line)}
.tier{font-size:.75rem;text-transform:uppercase;letter-spacing:1.2px}
.tier.high{color:#E9835D}
.tier.mid{color:var(--gold-2)}
.tier.low{color:#8FC59A}

/* ---------- PRICING ---------- */
.price-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;align-items:stretch}
.price{
  background:linear-gradient(180deg,#131C30,#0E1626);
  border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:34px 30px;display:flex;flex-direction:column;position:relative;
}
.price.featured{
  border-color:var(--gold);
  background:linear-gradient(180deg,#1A2540 0%,#0E1626 100%);
  box-shadow:0 20px 80px -30px rgba(201,164,92,.4);
}
.price .badge{
  position:absolute;top:-14px;left:30px;
  background:linear-gradient(135deg,var(--gold-2),var(--gold));
  color:#0B1220;font-size:.72rem;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;
  padding:5px 14px;border-radius:999px;
}
.price h3{font-family:var(--font-serif);font-size:1.5rem;color:var(--cream)}
.price .amount{margin:14px 0 6px;display:flex;align-items:baseline;gap:6px}
.price .amount .num{font-family:var(--font-serif);font-size:3rem;color:var(--gold-2);line-height:1}
.price .amount .u{color:#8B98AE;font-size:.9rem}
.price .sub{color:#B7C0CE;font-size:.88rem;margin-bottom:22px}
.price ul{list-style:none;padding:0;margin:0 0 26px;flex:1}
.price li{padding:9px 0;border-bottom:1px dashed var(--line);font-size:.92rem;color:#DDE4EF;display:flex;gap:10px}
.price li::before{content:"◆";color:var(--gold);font-size:.7rem;margin-top:6px}

/* ---------- CTA BAND ---------- */
.cta-band{
  background:
    radial-gradient(600px 300px at 20% 20%,rgba(201,164,92,.18),transparent 60%),
    linear-gradient(135deg,#1A2540,#0B1220);
  border:1px solid var(--line-strong);border-radius:var(--radius-lg);
  padding:56px;text-align:center;position:relative;overflow:hidden;
}
.cta-band h2{margin-bottom:12px}
.cta-band p{color:#B7C0CE;max-width:560px;margin:0 auto 26px}

/* ---------- FOOTER ---------- */
footer{
  border-top:1px solid var(--line);margin-top:80px;
  background:#080D18;padding:56px 0 30px;color:#8B98AE;font-size:.88rem;
}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;margin-bottom:36px}
.foot-grid h4{color:var(--cream);font-family:var(--font-sans);font-size:.85rem;letter-spacing:1.5px;text-transform:uppercase;margin-bottom:14px}
.foot-grid a{display:block;color:#B7C0CE;padding:5px 0}
.foot-grid a:hover{color:var(--gold-2)}
.foot-bottom{display:flex;justify-content:space-between;padding-top:24px;border-top:1px solid var(--line);color:#6B7688}

/* ---------- AUTH PAGES ---------- */
.auth-wrap{min-height:calc(100vh - 72px);display:grid;grid-template-columns:1fr 1fr}
.auth-hero{
  background:
    radial-gradient(600px 400px at 30% 30%,rgba(201,164,92,.18),transparent 60%),
    radial-gradient(500px 500px at 80% 80%,rgba(139,110,78,.20),transparent 60%),
    linear-gradient(160deg,#0B1220,#050810);
  padding:64px;display:flex;flex-direction:column;justify-content:space-between;position:relative;overflow:hidden;
  border-right:1px solid var(--line);
}
.auth-hero .quote{font-family:var(--font-serif);font-style:italic;font-size:1.6rem;color:var(--cream);line-height:1.4;max-width:480px}
.auth-hero .quote::before{content:"“";color:var(--gold);font-size:3rem;font-family:var(--font-serif);display:block;line-height:.6}
.auth-hero .attr{color:#B7C0CE;font-size:.9rem;letter-spacing:1px}
.auth-form-wrap{display:flex;align-items:center;justify-content:center;padding:64px 40px;background:#0B1220}
.auth-form{width:100%;max-width:420px}
.auth-form h1{font-size:2rem;margin-bottom:8px}
.auth-form .sub{color:#B7C0CE;margin-bottom:32px}
.field{margin-bottom:18px}
.field label{display:block;font-size:.82rem;color:var(--muted);letter-spacing:.5px;margin-bottom:6px}
.field input{
  width:100%;background:#131C30;border:1px solid var(--line-strong);border-radius:10px;
  padding:13px 16px;color:var(--cream);font-family:var(--font-sans);font-size:.95rem;
  transition:all .2s;
}
.field input:focus{outline:none;border-color:var(--gold);box-shadow:0 0 0 3px rgba(201,164,92,.15)}
.row-between{display:flex;justify-content:space-between;align-items:center;margin:6px 0 20px;font-size:.85rem}
.divider{display:flex;align-items:center;gap:14px;color:var(--muted);font-size:.78rem;letter-spacing:1.5px;text-transform:uppercase;margin:24px 0}
.divider::before,.divider::after{content:"";flex:1;height:1px;background:var(--line)}
.social-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.social{
  padding:12px;border-radius:10px;border:1px solid var(--line-strong);
  background:#131C30;color:var(--cream);text-align:center;font-size:.9rem;cursor:pointer;
}
.social:hover{border-color:var(--gold)}

/* ---------- DOCS ---------- */
.docs-layout{display:grid;grid-template-columns:260px 1fr;gap:48px;padding-top:40px}
.docs-side{position:sticky;top:96px;align-self:start;border-right:1px solid var(--line);padding-right:22px}
.docs-side h4{font-family:var(--font-sans);font-size:.78rem;letter-spacing:1.5px;text-transform:uppercase;color:var(--muted);margin:22px 0 10px}
.docs-side a{display:block;padding:6px 0;color:#CBD3E1;font-size:.9rem;border-left:2px solid transparent;padding-left:12px;margin-left:-14px}
.docs-side a.active,.docs-side a:hover{color:var(--gold-2);border-left-color:var(--gold)}
.docs-main{max-width:800px}
.docs-main h1{font-size:2.4rem}
.docs-main h2{margin-top:44px}
.docs-main pre{
  background:#080D18;border:1px solid var(--line);border-radius:12px;
  padding:20px 22px;overflow-x:auto;color:#DDE4EF;font-size:.85rem;line-height:1.65;
}
.docs-main code{color:var(--gold-2);font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
.docs-main pre code{color:#DDE4EF}
.docs-main .note{
  border-left:3px solid var(--gold);background:rgba(201,164,92,.06);
  padding:14px 18px;border-radius:0 10px 10px 0;color:#DDE4EF;margin:18px 0;
}

/* ---------- LEGAL PAGES ---------- */
.legal-meta{color:var(--muted);font-size:.9rem;margin:0 0 28px}
.legal-meta strong{color:var(--gold-2);font-weight:600}
.docs-main.legal h2{font-size:1.35rem;scroll-margin-top:96px}
.docs-main.legal h3{font-family:var(--font-sans);font-size:1.02rem;color:var(--gold-2);margin:22px 0 10px;font-weight:600}
.docs-main.legal ol,.docs-main.legal ul{margin:0 0 1em;padding-left:1.25em;color:#CBD3E1}
.docs-main.legal li{margin:0 0 .45em}
.docs-main.legal ol.toc-list{list-style:decimal}
.docs-main.legal table{
  width:100%;border-collapse:collapse;margin:16px 0 24px;
  border:1px solid var(--line);border-radius:12px;overflow:hidden;font-size:.92rem;
}
.docs-main.legal th,.docs-main.legal td{
  padding:12px 14px;border-top:1px solid var(--line);text-align:left;vertical-align:top;color:#DDE4EF;
}
.docs-main.legal th{background:#131C30;color:var(--gold-2);font-size:.78rem;letter-spacing:1px;text-transform:uppercase;border-top:0}
.docs-main.legal .legal-stamp{
  margin-top:48px;padding-top:24px;border-top:1px solid var(--line);
  color:var(--muted);font-size:.85rem;
}

/* ---------- RESPONSIVE ---------- */
@media (max-width:900px){
  .hero-grid,.grid-3,.grid-4,.grid-2,.price-grid,.foot-grid,.auth-wrap,.docs-layout{grid-template-columns:1fr}
  .nav-links{display:none}
  .hero{padding:56px 0 30px}
  section{padding:56px 0}
  .cta-band{padding:36px 24px}
  .auth-hero{padding:40px 28px}
  .docs-side{position:static;border-right:0;border-bottom:1px solid var(--line);padding-bottom:20px}
}