/* ============================================================
   FFLO · 百工 — fflo.ai marketing site (LIGHT theme)
   Merged from the design-system bundle in cascade order:
     1) colors_and_type.css  (foundation tokens + type)
     2) site.css             (site layout & components)
     3) site-light.css       (light token flip + overrides)
   @import rules resolved/inlined; Google Fonts import hoisted.
   ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600;700&family=Noto+Sans+SC:wght@400;500;700;900&family=Noto+Serif+SC:wght@400;500;600&display=swap');

/* ========== [1] colors_and_type.css — foundation tokens ========== */
/* ============================================================
   FFLO · 百工 — Foundations: Color & Type
   FDE tech-brand aesthetic (Palantir / Anduril / Cognition / Bloomberg)
   Dark + gold · high information density · multilingual juxtaposition
   ============================================================ */

/* --- Webfonts -----------------------------------------------
   EN display/body : Inter (brief: Inter Black / Geist Sans)
   EN mono/data    : JetBrains Mono (brief: JetBrains Mono / Geist Mono)
   CN sans         : Noto Sans SC  (= 思源黑体 Source Han Sans)
   CN serif/quotes : Noto Serif SC (= 思源宋体 Source Han Serif)
   Loaded from Google Fonts CDN — these are the open-source twins of
   the families named in the brief. Swap to licensed Helvetica Now /
   阿里普惠体 in production if desired.
------------------------------------------------------------- */

:root {
  /* ---------- Surface / background (90% dark) ---------- */
  --onyx:      #0E1419;  /* 黑曜 — primary background        60% */
  --slate:     #14181E;  /* 墨灰 — secondary background      20% */
  --graphite:  #1A1D24;  /* 石墨 — cards / panels            10% */
  --dim:       #2A2D35;  /* 暗界 — borders / hairlines        5% */
  --graphite-hi: #20242C;/* card hover / raised surface         */

  /* ---------- Brand gold (the 5% that carries the brand) ---------- */
  --atelier-gold: #C9A961; /* 工肆金 — brand primary             */
  --forge-yellow: #E8C547; /* 高亮金 — key data / CTA            */
  --gold-soft:    #C9A96133;/* gold @ 20% — fills / glows        */
  --gold-line:    #C9A961;  /* the "flow" hairline               */

  /* ---------- Accents (semantic — never >5 colors per view) ---------- */
  --pulse-green: #7CA982; /* 在线 / 完成                         */
  --alert-red:   #FF6B47; /* 风险 / 错误                         */
  --signal-blue: #4A6FA5; /* 链接 / 提示                         */

  /* ---------- Text ---------- */
  --text-1: #FFFFFF;  /* primary                                 */
  --text-2: #E8E4D9;  /* secondary (warm 米)                     */
  --text-3: #8B919E;  /* muted                                   */
  --text-4: #5A6068;  /* faint / axis labels / disabled          */

  /* ---------- Light-surface UI (Bottega main pane) ---------- */
  --paper:    #FAFAFA; /* main work surface                      */
  --paper-2:  #FFFFFF;
  --paper-ink:#1A1D24; /* ink on paper                           */
  --paper-line:#E6E4DD;

  /* ---------- Type families ---------- */
  --font-display: 'Inter', 'Noto Sans SC', system-ui, sans-serif;
  --font-sans:    'Inter', 'Noto Sans SC', system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', ui-monospace, 'SFMono-Regular', monospace;
  --font-serif-cn:'Noto Serif SC', 'Songti SC', serif; /* 典故 / 引文 */

  /* ---------- Type scale (display weights are heavy/black) ---------- */
  --fs-hero:   72px;  --lh-hero:   0.98; --fw-hero:   900;
  --fs-h1:     48px;  --lh-h1:     1.04; --fw-h1:     800;
  --fs-h2:     34px;  --lh-h2:     1.10; --fw-h2:     800;
  --fs-h3:     24px;  --lh-h3:     1.20; --fw-h3:     700;
  --fs-lead:   19px;  --lh-lead:   1.55; --fw-lead:   400;
  --fs-body:   16px;  --lh-body:   1.62; --fw-body:   400;
  --fs-sm:     14px;  --lh-sm:     1.55;
  --fs-mono:   13px;  --lh-mono:   1.5;
  --fs-label:  11px;  --lh-label:  1.3;  /* mono eyebrow / kicker */

  /* tracking */
  --track-logo:  0.09em;  /* FFLO letterspacing               */
  --track-cn:    0.40em;  /* 百 ⇄ 工 ceremonial spread        */
  --track-label: 0.22em;  /* mono kickers, all-caps           */
  --track-tight: -0.02em; /* large display                    */

  /* ---------- Spacing (8pt base, dense) ---------- */
  --sp-1: 4px;  --sp-2: 8px;  --sp-3: 12px; --sp-4: 16px;
  --sp-5: 24px; --sp-6: 32px; --sp-7: 48px; --sp-8: 64px; --sp-9: 96px;

  /* ---------- Radii (4–12px only; no big rounding) ---------- */
  --r-xs: 3px; --r-sm: 5px; --r-md: 8px; --r-lg: 12px; --r-pill: 999px;

  /* ---------- Borders ---------- */
  --bd:       1px solid var(--dim);
  --bd-gold:  1px solid var(--atelier-gold);
  --bd-faint: 1px solid #20242C;

  /* ---------- Shadows / elevation (subtle, cool) ---------- */
  --sh-1: 0 1px 2px rgba(0,0,0,.4);
  --sh-2: 0 4px 16px rgba(0,0,0,.45);
  --sh-3: 0 12px 40px rgba(0,0,0,.55);
  --glow-gold: 0 0 0 1px rgba(201,169,97,.35), 0 0 24px rgba(201,169,97,.12);

  /* ---------- Grid / blueprint background ---------- */
  --grid-line: rgba(42,45,53,.55);
  --grid-size: 28px;
}

/* ============================================================
   Semantic element styles — apply via class or copy as needed
   ============================================================ */

.fflo-hero   { font-family: var(--font-display); font-weight: var(--fw-hero); font-size: var(--fs-hero); line-height: var(--lh-hero); letter-spacing: var(--track-tight); color: var(--text-1); }
.fflo-h1     { font-family: var(--font-display); font-weight: var(--fw-h1); font-size: var(--fs-h1); line-height: var(--lh-h1); letter-spacing: var(--track-tight); color: var(--text-1); }
.fflo-h2     { font-family: var(--font-display); font-weight: var(--fw-h2); font-size: var(--fs-h2); line-height: var(--lh-h2); color: var(--text-1); }
.fflo-h3     { font-family: var(--font-display); font-weight: var(--fw-h3); font-size: var(--fs-h3); line-height: var(--lh-h3); color: var(--text-1); }
.fflo-lead   { font-family: var(--font-sans); font-size: var(--fs-lead); line-height: var(--lh-lead); color: var(--text-2); }
.fflo-body   { font-family: var(--font-sans); font-size: var(--fs-body); line-height: var(--lh-body); color: var(--text-2); }
.fflo-muted  { color: var(--text-3); }

/* mono — data / status / commands / units */
.fflo-mono   { font-family: var(--font-mono); font-size: var(--fs-mono); line-height: var(--lh-mono); color: var(--text-2); }
.fflo-label  { font-family: var(--font-mono); font-size: var(--fs-label); line-height: var(--lh-label); letter-spacing: var(--track-label); text-transform: uppercase; color: var(--text-3); }
.fflo-data   { font-family: var(--font-mono); font-variant-numeric: tabular-nums; color: var(--forge-yellow); }

/* CN classical quote */
.fflo-quote-cn { font-family: var(--font-serif-cn); font-weight: 500; color: var(--text-2); line-height: 1.7; }

/* gold flow hairline (logo + dividers) */
.fflo-flowline {
  height: 2px; border: 0;
  background: linear-gradient(90deg, var(--forge-yellow) 0%, var(--forge-yellow) 25%, var(--atelier-gold) 25%, var(--atelier-gold) 100%);
}

/* blueprint grid background utility */
.fflo-grid-bg {
  background-color: var(--onyx);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: var(--grid-size) var(--grid-size);
}

/* ========== [2] site.css — layout & components ========== */
/* FFLO 官网 — fflo.ai marketing site styles. Imports root tokens. */

*{box-sizing:border-box}
html,body{margin:0;background:var(--onyx);color:var(--text-1);font-family:var(--font-sans);
  -webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
.wrap{max-width:1200px;margin:0 auto;padding:0 40px}
.mono{font-family:var(--font-mono)}
.eyebrow{font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;text-transform:uppercase;color:var(--atelier-gold)}
.grid-bg{background-image:
  linear-gradient(var(--grid-line) 1px,transparent 1px),
  linear-gradient(90deg,var(--grid-line) 1px,transparent 1px);
  background-size:32px 32px}

/* ---------- Nav ---------- */
.nav{position:sticky;top:0;z-index:50;backdrop-filter:blur(10px);
  background:rgba(14,20,25,.78);border-bottom:1px solid var(--dim)}
.nav-inner{display:flex;align-items:center;gap:32px;height:64px}
.nav .logo{font-family:var(--font-display);font-weight:900;letter-spacing:.08em;font-size:21px}
.nav .logo b{color:var(--text-1)}
.nav .cn{font-family:var(--font-sans);font-weight:900;color:var(--text-2);letter-spacing:.22em;font-size:13px;margin-left:8px}
.nav-links{display:flex;gap:26px;margin-left:8px}
.nav-links a{font-size:14px;color:var(--text-3);white-space:nowrap}
.nav-links a:hover{color:var(--text-1)}
.nav-cta{margin-left:auto;display:flex;gap:12px;align-items:center}

/* ---------- Buttons ---------- */
.btn{font-family:var(--font-sans);font-size:14px;font-weight:600;border-radius:6px;
  padding:10px 18px;cursor:pointer;border:1px solid transparent;display:inline-flex;
  align-items:center;gap:8px;white-space:nowrap;transition:all .18s cubic-bezier(.2,.6,.2,1)}
.btn-primary{background:var(--forge-yellow);color:#1A1D24;border-color:var(--forge-yellow)}
.btn-primary:hover{filter:brightness(1.08)}
.btn-ghost{background:transparent;color:var(--text-2);border-color:var(--dim)}
.btn-ghost:hover{border-color:var(--atelier-gold);color:var(--text-1)}
.btn-sm{padding:7px 13px;font-size:13px}

/* ---------- Hero ---------- */
.hero{position:relative;padding:96px 0 80px;overflow:hidden;border-bottom:1px solid var(--dim)}
.hero .grid-layer{position:absolute;inset:0;opacity:.5;
  mask-image:radial-gradient(ellipse 80% 70% at 50% 30%,#000 30%,transparent 80%)}
.hero-inner{position:relative;display:grid;grid-template-columns:1.15fr .85fr;gap:56px;align-items:center}
.hero h1{font-family:var(--font-display);font-weight:900;font-size:76px;line-height:.98;
  letter-spacing:-.02em;margin:18px 0 0}
.hero h1 .gold{color:var(--atelier-gold)}
.hero .cnline{font-family:var(--font-sans);font-weight:900;font-size:26px;color:var(--text-2);
  letter-spacing:.06em;margin-top:18px}
.hero .sub{font-size:18px;line-height:1.6;color:var(--text-3);max-width:46ch;margin-top:20px}
.hero .cta-row{display:flex;gap:14px;margin-top:30px}
.hero .metrics{display:flex;gap:30px;margin-top:40px;padding-top:26px;border-top:1px solid var(--dim)}
.metric .n{font-family:var(--font-mono);font-weight:700;font-size:26px;color:var(--forge-yellow)}
.metric .l{font-family:var(--font-mono);font-size:11px;color:var(--text-4);letter-spacing:.04em;margin-top:4px}

/* hero quote panel */
.quote-panel{background:var(--graphite);border:1px solid var(--dim);border-radius:10px;
  padding:30px 28px;position:relative}
.quote-panel .corner{position:absolute;width:12px;height:12px;border-color:var(--atelier-gold)}
.q-tl{top:10px;left:10px;border-top:1.5px solid;border-left:1.5px solid}
.q-br{bottom:10px;right:10px;border-bottom:1.5px solid;border-right:1.5px solid}
.quote-panel .zh{font-family:var(--font-serif-cn);font-weight:500;font-size:23px;line-height:1.7;color:var(--text-2)}
.quote-panel .src{font-family:var(--font-mono);font-size:11px;color:var(--text-4);margin-top:14px;letter-spacing:.04em}
.quote-panel .en{font-size:13px;color:var(--text-3);line-height:1.6;margin-top:14px;border-top:1px dashed var(--dim);padding-top:14px}

/* ---------- Section ---------- */
.section{padding:84px 0;border-bottom:1px solid var(--dim)}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:42px;gap:24px}
.section-head h2{font-family:var(--font-display);font-weight:800;font-size:38px;letter-spacing:-.01em;margin:8px 0 0}
.section-head p{font-size:15px;color:var(--text-3);max-width:42ch;margin:0}

/* arguments */
.args{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.arg{background:var(--graphite);border:1px solid var(--dim);border-radius:10px;padding:26px 24px;
  transition:border-color .18s}
.arg:hover{border-color:#3a3d46}
.arg .idx{font-family:var(--font-mono);font-size:12px;color:var(--atelier-gold)}
.arg h3{font-family:var(--font-display);font-weight:800;font-size:22px;margin:14px 0 6px}
.arg .zh{font-size:14px;color:var(--text-3);line-height:1.6}
.arg .ico{width:34px;height:34px;color:var(--atelier-gold);margin-bottom:6px}

/* product demo */
.demo{background:linear-gradient(180deg,var(--slate),var(--onyx));border:1px solid var(--dim);
  border-radius:12px;overflow:hidden}
.demo-bar{display:flex;align-items:center;gap:8px;padding:11px 16px;border-bottom:1px solid var(--dim);
  background:var(--graphite)}
.demo-bar .dot{width:10px;height:10px;border-radius:50%}
.demo-bar .t{font-family:var(--font-mono);font-size:12px;color:var(--text-4);margin-left:8px}
.demo-body{display:grid;grid-template-columns:200px 1fr;min-height:340px}
.demo-side{background:var(--onyx);border-right:1px solid var(--dim);padding:16px 14px;font-family:var(--font-mono);font-size:12px}
.demo-side .item{display:flex;align-items:center;gap:9px;padding:7px 8px;border-radius:5px;color:var(--text-3)}
.demo-side .item.active{background:rgba(201,169,97,.10);color:var(--text-1)}
.demo-main{padding:24px 26px}

/* atelier grid */
.atelier-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:12px}
.atelier{background:var(--graphite);border:1px solid var(--dim);border-radius:8px;padding:16px 15px;
  cursor:pointer;transition:all .16s;position:relative}
.atelier:hover{border-color:var(--atelier-gold);background:var(--graphite-hi);transform:translateY(-2px)}
.atelier .name{font-family:var(--font-display);font-weight:800;font-size:19px}
.atelier .en{font-family:var(--font-mono);font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:var(--text-4);margin-top:3px}
.atelier .skills{font-family:var(--font-mono);font-size:11px;color:var(--atelier-gold);margin-top:14px;
  display:flex;align-items:center;gap:6px}

/* pricing */
.pricing{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;align-items:stretch}
.plan{background:var(--graphite);border:1px solid var(--dim);border-radius:12px;padding:28px 26px;display:flex;flex-direction:column}
.plan.feature{border-color:var(--atelier-gold);background:linear-gradient(180deg,rgba(201,169,97,.08),transparent 60%)}
.plan .pname{font-family:var(--font-display);font-weight:800;font-size:21px}
.plan .pen{font-family:var(--font-mono);font-size:11px;color:var(--text-4);letter-spacing:.12em;text-transform:uppercase;margin-top:3px}
.plan .price{font-family:var(--font-mono);font-weight:700;font-size:42px;color:var(--text-1);margin:22px 0 2px}
.plan .price .u{font-size:15px;color:var(--text-4);font-weight:400}
.plan ul{list-style:none;padding:0;margin:22px 0 24px;display:flex;flex-direction:column;gap:11px}
.plan li{font-size:14px;color:var(--text-3);display:flex;gap:10px;align-items:flex-start}
.plan li .ck{color:var(--pulse-green);font-family:var(--font-mono)}
.plan .btn{margin-top:auto;justify-content:center}

/* footer */
.footer{padding:64px 0 40px;background:var(--slate)}
.footer-top{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:32px;padding-bottom:40px;border-bottom:1px solid var(--dim)}
.footer h4{font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--text-4);margin:0 0 16px}
.footer a{display:block;font-size:14px;color:var(--text-3);margin-bottom:11px}
.footer a:hover{color:var(--text-1)}
.footer .zh-close{font-family:var(--font-serif-cn);font-size:16px;color:var(--text-3);line-height:1.7;max-width:30ch}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;padding-top:26px;
  font-family:var(--font-mono);font-size:12px;color:var(--text-4)}

/* toast */
.toast{position:fixed;bottom:28px;left:50%;transform:translateX(-50%);background:var(--graphite);
  border:1px solid var(--atelier-gold);border-radius:8px;padding:13px 20px;font-size:14px;color:var(--text-1);
  box-shadow:var(--sh-3);z-index:100;display:flex;align-items:center;gap:10px}

/* ========== [3] site-light.css — light token flip + overrides ========== */
/* FFLO 官网 — LIGHT theme. Token flip over site.css + a few hardcoded overrides.
   Keeps the FDE discipline: warm paper, deeper gold, grid + brackets + mono. */

/* ---- light token values ---- */
:root, body {
  --onyx:      #F4F1EA;  /* page — warm paper */
  --slate:     #ECE8DE;  /* secondary surface (footer) */
  --graphite:  #FFFFFF;  /* cards */
  --graphite-hi:#F8F5EE; /* hover */
  --dim:       #E3DECF;  /* hairline borders */

  --atelier-gold: #A8842F; /* deeper gold — reads on paper */
  --forge-yellow: #C79A2C; /* deep gold for data / CTA fill */

  --pulse-green: #5B8A63;
  --alert-red:   #D8492A;
  --signal-blue: #3C5C8A;

  --text-1: #1A1D24;  /* ink */
  --text-2: #3C3F46;
  --text-3: #6E7178;
  --text-4: #9A9CA2;

  --grid-line: rgba(40,36,24,.06);
}

/* ---- overrides for spots that hardcoded dark values ---- */
html,body{background:var(--onyx)}
.nav{background:rgba(244,241,234,.82);border-bottom:1px solid var(--dim)}
.nav .logo b{color:var(--text-1)}

/* demo strip: was dark gradient → make it a light terminal-on-paper */
.demo{background:#FBFAF6}
.demo-bar{background:#F1EEE5}
.demo-side{background:#F6F3EB}
.demo-side .item.active{background:rgba(168,132,47,.12)}

/* CTA primary keeps gold fill + ink text (already token-driven) */
.btn-primary{color:#1A1D24}

/* toast on light */
.toast{box-shadow:0 12px 40px rgba(60,50,20,.18)}

/* slightly stronger card hover border on paper */
.arg:hover{border-color:var(--atelier-gold)}

/* keep the AI report mono block readable on the demo */
.demo-main .mono, .demo-main{color:var(--text-2)}