:root{
    --navy:#012F7F;
    --navy-deep:#021E52;
    --cyan:#1A8FB0;
    --sky:#1E9AFE;
    --gold:#E3B721;
    --ink:#2C2C2A;
    --muted:#5b6472;
    --bg:#F4F7FC;
    --bg-soft:#E8EEF8;
    --white:#ffffff;
    --line:#d7e2f2;
    --maxw:820px;
  }
  *{box-sizing:border-box;margin:0;padding:0;}
  html{scroll-behavior:smooth;}
  body{
    font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
    color:var(--ink);
    background:var(--bg);
    line-height:1.75;
    font-size:18px;
    -webkit-font-smoothing:antialiased;
  }
  img{max-width:100%;display:block;}
  a{color:var(--sky);text-decoration:none;}

  /* ---- reading progress bar ---- */
  #progress{
    position:fixed;top:0;left:0;height:4px;width:0;z-index:100;
    background:linear-gradient(90deg,var(--sky),var(--cyan));
    transition:width .1s linear;
  }

  /* ---- HERO ---- */
  .hero{
    position:relative;
    min-height:100vh;
    display:flex;flex-direction:column;justify-content:center;
    padding:80px 0 96px;
    color:#fff;
    background-image:
      linear-gradient(90deg, rgba(1,17,50,.92) 0%, rgba(1,23,63,.74) 40%, rgba(1,23,63,.42) 64%, rgba(1,23,63,.30) 100%),
      url('hero-bg.jpg');
    background-size:cover; background-position:center; background-repeat:no-repeat;
    overflow:hidden;
  }
  .hero::after{
    content:"";position:absolute;inset:0;
    background-image:
      linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),
      linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
    background-size:44px 44px;
    mask-image:radial-gradient(circle at 50% 40%, #000 0%, transparent 75%);
    -webkit-mask-image:radial-gradient(circle at 50% 40%, #000 0%, transparent 75%);
    pointer-events:none;
  }
  .hero-inner{position:relative;z-index:2;max-width:980px;margin:0;width:100%;padding:0 24px 0 clamp(28px,7vw,120px);}
  .brand-row{display:flex;align-items:center;gap:12px;margin-bottom:44px;}
  .brand-mark{
    display:flex;align-items:center;gap:10px;
    font-weight:800;letter-spacing:.5px;font-size:20px;
    background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.25);
    padding:8px 16px;border-radius:999px;backdrop-filter:blur(4px);
  }
  .brand-mark svg{width:22px;height:22px;}
  .kicker{
    display:inline-block;font-size:14px;font-weight:700;letter-spacing:3px;
    text-transform:uppercase;color:#9ecbff;margin-bottom:20px;
  }
  .hero h1{
    font-size:clamp(38px,7vw,74px);
    line-height:1.18;font-weight:900;letter-spacing:-1px;
    margin-bottom:24px;
  }
  .hero h1 .accent{
    background:linear-gradient(90deg,#5fb8ff,#2ee6c5);
    -webkit-background-clip:text;background-clip:text;color:transparent;
  }
  .hero .lead{
    font-size:clamp(17px,2.4vw,22px);color:#d8e6ff;max-width:640px;font-weight:400;
  }
  .hero .years{
    margin-top:40px;display:flex;align-items:center;gap:18px;
    font-weight:800;font-size:clamp(20px,3vw,30px);color:#fff;
  }
  .hero .years span{color:var(--gold);}
  .hero .years .bar{flex:0 0 60px;height:3px;background:linear-gradient(90deg,var(--gold),transparent);}
  .scroll-hint{
    position:absolute;bottom:28px;left:50%;transform:translateX(-50%);
    z-index:2;color:#bcd4ff;font-size:13px;letter-spacing:2px;text-transform:uppercase;
    display:flex;flex-direction:column;align-items:center;gap:8px;
  }
  .scroll-hint .dot{width:26px;height:42px;border:2px solid rgba(255,255,255,.5);border-radius:14px;position:relative;}
  .scroll-hint .dot::before{content:"";position:absolute;left:50%;top:8px;transform:translateX(-50%);width:4px;height:8px;background:#fff;border-radius:2px;animation:sd 1.6s infinite;}
  @keyframes sd{0%{opacity:0;transform:translate(-50%,0);}40%{opacity:1;}80%{opacity:0;transform:translate(-50%,14px);}100%{opacity:0;}}

  /* ---- LEAD / intro ---- */
  .wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px;}
  .section{padding:72px 0;}
  .lead-block{padding-top:56px;}
  .dropcap p:first-of-type::first-letter{
    float:left;font-size:78px;line-height:.82;font-weight:900;color:var(--navy);
    padding:6px 14px 0 0;
  }
  .lead-block p{font-size:20px;color:#3a4150;margin-bottom:22px;}

  /* ---- chapters ---- */
  .chapter{padding:30px 0;}
  .chapter-tag{
    display:inline-flex;align-items:center;gap:10px;
    font-size:13px;font-weight:800;letter-spacing:2px;text-transform:uppercase;
    color:var(--cyan);margin-bottom:14px;
  }
  .chapter-tag .num{
    display:inline-flex;align-items:center;justify-content:center;
    width:30px;height:30px;border-radius:50%;background:var(--navy);color:#fff;font-size:13px;
  }
  .chapter h2{
    font-size:clamp(26px,4.4vw,40px);line-height:1.15;font-weight:800;
    color:var(--navy);letter-spacing:-.5px;margin-bottom:8px;
  }
  .chapter .period{color:var(--sky);font-weight:700;font-size:15px;letter-spacing:1px;margin-bottom:22px;}
  .chapter p{margin-bottom:20px;color:#39414f;}
  .chapter p strong{color:var(--navy);font-weight:700;}

  /* pull quote */
  .pull{
    margin:24px 0;padding:24px 30px;border-left:5px solid var(--gold);
    background:var(--white);border-radius:0 14px 14px 0;
    box-shadow:0 10px 30px rgba(1,47,127,.06);
  }
  .pull q, .pull .q{
    font-size:clamp(20px,3vw,27px);font-weight:800;color:var(--navy);line-height:1.35;
    display:block;quotes:none;
  }
  .pull .q::before{content:"“";color:var(--gold);}
  .pull .q::after{content:"”";color:var(--gold);}

  /* mini stat inline row */
  .facts{display:flex;flex-wrap:wrap;gap:14px;margin:30px 0 6px;}
  .fact{
    flex:1 1 160px;background:var(--bg-soft);border-radius:14px;padding:18px 20px;
    border:1px solid var(--line);
  }
  .fact b{display:block;font-size:30px;font-weight:900;color:var(--cyan);line-height:1;}
  .fact span{font-size:13.5px;color:var(--muted);font-weight:500;}

  /* ---- TIMELINE (infographic style) ---- */
  .timeline-section{background:linear-gradient(180deg,#fff, #eef4fd);padding:80px 0 90px;}
  .sec-head{text-align:center;max-width:640px;margin:0 auto 54px;padding:0 24px;}
  .sec-head .kicker2{color:var(--cyan);font-weight:800;letter-spacing:2px;text-transform:uppercase;font-size:13px;}
  .sec-head h2{font-size:clamp(28px,4.6vw,42px);color:var(--navy);font-weight:800;margin:10px 0 12px;letter-spacing:-.5px;}
  .sec-head p{color:var(--muted);font-size:17px;}

  .timeline{position:relative;max-width:760px;margin:0 auto;padding:0 24px;}
  .timeline::before{
    content:"";position:absolute;left:53px;top:8px;bottom:8px;width:3px;
    background:linear-gradient(180deg,var(--sky),var(--cyan));border-radius:3px;
  }
  .tl-item{position:relative;padding:0 0 44px 96px;}
  .tl-item:last-child{padding-bottom:0;}
  .tl-year{
    position:absolute;left:0;top:0;width:60px;height:60px;border-radius:50%;
    background:var(--navy);color:#fff;display:flex;align-items:center;justify-content:center;
    font-weight:800;font-size:15px;box-shadow:0 6px 16px rgba(1,47,127,.28);z-index:2;
  }
  .tl-icon{
    position:absolute;left:80px;top:6px;width:48px;height:48px;border-radius:50%;
    background:#e2f0f7;display:flex;align-items:center;justify-content:center;
  }
  .tl-icon svg{width:24px;height:24px;stroke:var(--cyan);fill:none;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round;}
  .tl-body{padding-left:56px;}
  .tl-body h3{color:var(--navy);font-size:19px;font-weight:800;margin-bottom:4px;}
  .tl-body p{color:#48505f;font-size:15.5px;line-height:1.6;}

  /* ---- STATS BAR ---- */
  .stats{
    background-image:linear-gradient(rgba(2,18,54,.72),rgba(1,24,66,.82)),url('stats-bg.jpg');
    background-size:cover;background-position:center;background-repeat:no-repeat;
    color:#fff;padding:64px 24px;
  }
  .stats-grid{
    max-width:960px;margin:0 auto;display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center;
  }
  .stat b{display:block;font-size:clamp(34px,6vw,54px);font-weight:900;color:#5fb8ff;line-height:1;}
  .stat span{display:block;margin-top:10px;font-size:13px;letter-spacing:2px;text-transform:uppercase;color:#c6d9f5;font-weight:600;}
  .stat.gold b{color:var(--gold);}

  /* ---- OUTRO / CTA ---- */
  .outro{background:var(--bg);padding:84px 0;text-align:center;}
  .outro .wrap{max-width:720px;}
  .outro h2{font-size:clamp(26px,4.4vw,38px);color:var(--navy);font-weight:800;margin-bottom:20px;letter-spacing:-.5px;}
  .outro p{font-size:19px;color:#3a4150;margin-bottom:18px;}
  .cta-card{
    margin-top:40px;background:#fff;border:1px solid var(--line);border-radius:20px;
    padding:38px 32px;box-shadow:0 20px 50px rgba(1,47,127,.08);
  }
  .cta-card h3{color:var(--navy);font-size:22px;font-weight:800;margin-bottom:10px;}
  .cta-card p{font-size:16.5px;color:var(--muted);margin-bottom:24px;}
  .btns{display:flex;flex-wrap:wrap;gap:14px;justify-content:center;}
  .btn{
    display:inline-flex;align-items:center;gap:9px;font-weight:700;font-size:16px;
    padding:14px 26px;border-radius:999px;transition:transform .15s,box-shadow .15s;
  }
  .btn-primary{background:var(--sky);color:#fff;box-shadow:0 8px 20px rgba(30,154,254,.35);}
  .btn-ghost{background:var(--bg-soft);color:var(--navy);border:1px solid var(--line);}
  .btn:hover{transform:translateY(-2px);}
  .btn svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;}

  /* ---- FOOTER ---- */
  footer{background:var(--navy-deep);color:#a9c1e6;padding:44px 24px;text-align:center;font-size:14.5px;}
  footer .fbrand{color:#fff;font-weight:800;font-size:18px;letter-spacing:.5px;margin-bottom:10px;}
  footer a{color:#7fb6ff;}
  footer .disc{margin-top:16px;font-size:12.5px;color:#6f89b5;max-width:640px;margin-left:auto;margin-right:auto;}

  /* ============ ADDED HIGHLIGHTS ============ */
  /* 1) Glowing intro card */
  .glow-sec{padding:70px 24px 40px;}
  .glow-card{position:relative;max-width:800px;margin:0 auto;border-radius:24px;padding:2.5px;
    background:linear-gradient(120deg,#1E9AFE,#2ee6c5,#012F7F,#1E9AFE);background-size:300% 300%;
    animation:borderflow 9s ease infinite;box-shadow:0 34px 80px rgba(1,47,127,.28);}
  @keyframes borderflow{0%{background-position:0% 50%}50%{background-position:100% 50%}100%{background-position:0% 50%}}
  .glow-card-inner{background:radial-gradient(120% 140% at 10% 0%, #063089 0%, #04246a 45%, #021640 100%);
    border-radius:21px;padding:46px 44px;color:#eaf2ff;}
  .glow-card .gc-kicker{font-size:13px;font-weight:800;letter-spacing:3px;text-transform:uppercase;color:#7fd0ff;}
  .glow-card h2{color:#fff;font-size:clamp(24px,3.6vw,34px);font-weight:900;line-height:1.2;margin:12px 0 20px;letter-spacing:-.5px;}
  .glow-card p{color:#c9dbf5;font-size:17.5px;margin-bottom:16px;line-height:1.7;}
  .glow-card p:last-of-type{margin-bottom:0;}
  .glow-card .gc-first::first-letter{float:left;font-size:64px;line-height:.8;font-weight:900;color:#5fb8ff;padding:6px 12px 0 0;}
  .glow-card .gc-meta{display:flex;align-items:center;gap:14px;margin-top:28px;padding-top:20px;border-top:1px solid rgba(255,255,255,.14);}
  .glow-card .gc-av{width:50px;height:50px;border-radius:50%;background:#fff;display:flex;align-items:center;justify-content:center;padding:7px;box-shadow:0 6px 16px rgba(0,0,0,.3);}
  .glow-card .gc-av img{width:100%;height:auto;}
  .glow-card .gc-name{font-weight:800;color:#fff;font-size:15px;letter-spacing:.5px;display:block;}
  .glow-card .gc-sub{color:#9ec2f0;font-size:13px;}

  /* 2) Immersive reveal band (full-viewport, parallax bg) */
  .reveal-band{position:relative;min-height:88vh;display:flex;align-items:center;justify-content:center;
    text-align:center;color:#fff;padding:90px 24px;overflow:hidden;}
  .rb-bg{position:absolute;inset:0;background-size:cover;background-position:center;background-attachment:fixed;}
  .rb-ov{position:absolute;inset:0;background:linear-gradient(180deg,rgba(2,16,50,.72),rgba(1,20,55,.82));}
  .rb-inner{position:relative;z-index:2;max-width:800px;}
  .rb-kicker{font-size:13px;font-weight:800;letter-spacing:4px;text-transform:uppercase;color:var(--gold);}
  .reveal-band h2{font-size:clamp(30px,5.4vw,58px);font-weight:900;line-height:1.08;letter-spacing:-1px;margin-top:16px;text-shadow:0 6px 30px rgba(0,0,0,.4);}
  .rb-line{width:72px;height:4px;background:var(--gold);margin:26px auto 0;border-radius:3px;}
  .rb-sub{margin-top:22px;color:#dbe8ff;font-size:clamp(16px,2.2vw,20px);font-weight:400;}

  /* 3) Spotlight quote card */
  .spotlight{position:relative;padding:96px 24px;overflow:hidden;background-image:linear-gradient(180deg,rgba(2,18,55,.55),rgba(1,14,42,.78)),url('spotlight-bg.jpg');background-size:cover,cover;background-position:center,center;background-repeat:no-repeat;}
  .spot-card{position:relative;z-index:2;max-width:740px;margin:0 auto;text-align:center;color:#fff;
    background:linear-gradient(160deg,#06296b,#03123a);border:1px solid rgba(120,180,255,.22);
    border-radius:26px;padding:56px 46px;box-shadow:0 40px 90px rgba(0,0,0,.45);}
  .spot-glow{position:absolute;border-radius:50%;filter:blur(80px);z-index:1;opacity:.38;}
  .spot-glow.g1{width:360px;height:360px;background:#1E9AFE;top:-70px;left:8%;animation:floaty 9s ease-in-out infinite;}
  .spot-glow.g2{width:320px;height:320px;background:#2ee6c5;bottom:-80px;right:8%;animation:floaty 12s ease-in-out infinite reverse;}
  @keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(26px)}}
  .spot-av{width:88px;height:88px;border-radius:50%;background:#fff;margin:0 auto 24px;display:flex;align-items:center;justify-content:center;padding:12px;box-shadow:0 0 0 7px rgba(30,154,254,.22),0 12px 30px rgba(0,0,0,.4);}
  .spot-av img{width:100%;height:auto;}
  .spot-quote{font-size:clamp(21px,3.2vw,31px);font-weight:800;line-height:1.4;color:#fff;}
  .spot-quote .qm{color:var(--gold);}
  .spot-line{width:64px;height:4px;background:var(--gold);margin:28px auto;border-radius:3px;}
  .spot-author{color:#9ecbff;font-weight:600;letter-spacing:.5px;font-size:15.5px;}

  @media(max-width:640px){
    .rb-bg{background-attachment:scroll;}
    .reveal-band{min-height:70vh;}
    .glow-card-inner{padding:34px 24px;}
    .spot-card{padding:40px 24px;}
  }

  /* reveal animation */
  .reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease;}
  .reveal.in{opacity:1;transform:none;}

  @media(max-width:640px){
    body{font-size:17px;}
    .lead-block p{font-size:18px;}
    .stats-grid{grid-template-columns:repeat(2,1fr);gap:28px 12px;}
    .timeline::before{left:43px;}
    .tl-item{padding-left:84px;}
    .tl-year{width:52px;height:52px;font-size:13px;}
    .tl-icon{left:66px;width:42px;height:42px;}
    .tl-body{padding-left:44px;}
    .dropcap p:first-of-type::first-letter{font-size:60px;}
  }

  /* ===== FIX: chống rớt dòng lẻ (orphan) & cân dòng tiêu đề/câu trích ===== */
  h1, h2, h3,
  .hero h1, .chapter h2, .reveal-band h2, .glow-card h2, .sec-head h2, .outro h2,
  .rb-sub, .glow-card .gc-kicker,
  .spot-quote, .cta-card h3, .cta-card p {
    text-wrap: balance;            /* cân đều số chữ giữa các dòng, tránh 1 chữ rớt xuống */
  }
  .pull .q{ text-wrap: pretty; }   /* pull-quote canh trái: lấp đầy dòng, không để trống phải */
  p, .chapter p, .glow-card p, .outro p, .tl-body p, .fact span, .stat span,
  .spot-author, .sec-head p, figcaption {
    text-wrap: pretty;             /* tránh dòng cuối chỉ còn 1 chữ mồ côi */
  }
  /* nhãn/cụm ngắn không nên tách làm đôi */
  .chapter-tag, .chapter .period, .rb-kicker, .sec-head .kicker2, .kicker { text-wrap: nowrap; }

  /* figure minh họa trong chương */
  .ch-figure{margin:34px 0 10px;}
  .ch-figure img{width:100%;border-radius:16px;border:1px solid var(--line);box-shadow:0 14px 36px rgba(1,47,127,.10);display:block;}
  .ch-figure figcaption{margin-top:12px;font-size:14px;font-style:italic;color:var(--muted);text-align:center;text-wrap:pretty;}

  /* ===== Sections kết bài: Lời cảm ơn & Thập kỷ mới ===== */
  .closing{max-width:var(--maxw);margin:0 auto;padding:34px 24px;}
  .ck-tag{display:inline-block;font-size:13px;font-weight:800;letter-spacing:2px;text-transform:uppercase;color:var(--cyan);margin-bottom:12px;}
  .closing h2{font-size:clamp(26px,4.4vw,38px);color:var(--navy);font-weight:800;letter-spacing:-.5px;margin-bottom:18px;}
  .closing > p{margin-bottom:18px;color:#39414f;}
  .thanks-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:6px;}
  .thanks-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:24px;box-shadow:0 10px 26px rgba(1,47,127,.05);}
  .thanks-card h3{color:var(--navy);font-size:16.5px;font-weight:800;margin-bottom:10px;}
  .thanks-card p{font-size:15.5px;color:#48505f;margin:0;}
  .principle{margin:30px 0 4px;padding:22px 26px;border-left:5px solid var(--gold);background:var(--bg-soft);border-radius:0 14px 14px 0;font-weight:600;color:var(--navy);font-size:clamp(17px,2.4vw,20px);line-height:1.55;}
  .principle b{font-weight:800;}
  @media(max-width:600px){.thanks-grid{grid-template-columns:1fr;}}

  .hero-logo{height:70px;width:auto;display:block;filter:drop-shadow(0 4px 14px rgba(0,0,0,.4));}
  footer .flogo{height:40px;width:auto;margin:0 auto 12px;display:block;}
  .closing strong{color:var(--navy);font-weight:700;}

  /* ===== Finale (dải kết) ===== */
  .finale{background:linear-gradient(120deg,var(--navy-deep),var(--navy) 68%,#0140a8);color:#fff;padding:88px 24px;text-align:center;}
  .finale-inner{max-width:680px;margin:0 auto;}
  .finale-logo{height:66px;width:auto;margin:0 auto 26px;display:block;opacity:.96;}
  .finale h2{font-size:clamp(28px,4.6vw,44px);font-weight:900;color:#fff;letter-spacing:-.5px;line-height:1.18;}
  .finale-line{width:64px;height:4px;background:var(--gold);margin:22px auto 24px;border-radius:3px;}
  .finale p{color:#cfe0ff;font-size:clamp(16px,2vw,19px);line-height:1.7;margin-bottom:32px;}
  .finale-btn{display:inline-flex;align-items:center;gap:8px;background:var(--gold);color:#3a2c00;font-weight:800;font-size:16px;padding:15px 32px;border-radius:999px;text-decoration:none;transition:transform .15s,box-shadow .15s;box-shadow:0 12px 28px rgba(227,183,33,.28);}
  .finale-btn:hover{transform:translateY(-2px);}
  .finale-hotline{margin-top:20px;font-size:14px;color:#9ec2f0;letter-spacing:.3px;}
  .ch-figure.plain{margin:20px auto 24px;}
  .ch-figure.plain img{border:none;box-shadow:none;border-radius:14px;background:transparent;}
  .chapter h2{ text-wrap: pretty; }   /* tiêu đề chương: lấp đầy dòng, không chừa trống phải */
  .standfirst{font-size:clamp(16px,2.1vw,20px);font-style:italic;font-weight:600;color:var(--cyan);margin-bottom:14px;line-height:1.5;text-wrap:pretty;}