:root{
  /* ---- BẢNG MÀU SÁNG, lấy theo trang "Passion for Water" của Suntory ---- */
  --ground:#c6e8fd;       /* NỀN TRANG — xanh nhạt, màu chiếm tỉ lệ lớn nhất ở trang Suntory */
  --ground-deep:#a4dafc;  /* dải nền xanh đậm hơn */
  --paper:#ffffff;        /* trắng — chỉ dùng cho khối nội dung, thẻ, khung ảnh */
  --sky:#c6e8fd;
  --sky-soft:#e6f5fe;     /* xanh rất nhạt — nền phụ trong thẻ */
  --sky-deep:#a4dafc;
  --aqua:#0aa2e0;         /* xanh nước sáng — MÀU DẪN */
  --aqua-deep:#0b7cb5;
  --aqua-dark:#075b86;
  --ink:#0d2437;          /* navy chữ */
  --ink-soft:#3d5a71;     /* chữ phụ */
  --mist:#42606f;         /* chú thích, nhãn */
  --line:#d5e7f2;         /* đường kẻ */
  --leaf:#5aa832;         /* xanh lá — màu phụ (rừng) */
  --leaf-deep:#3f7d22;
  --leaf-soft:#eaf6e2;
  --serif:'Space Grotesk','Be Vietnam Pro',sans-serif;
  --sans:'Be Vietnam Pro',sans-serif;
  --mono:'IBM Plex Mono',monospace;
  --vw:100vw;             /* JS ghi đè bằng clientWidth: 100vw tính cả thanh cuộn */
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);
  background:var(--ground);
  color:var(--ink);
  overflow-x:hidden;
  line-height:1.8;
}
::selection{background:var(--sky);color:var(--ink)}

/* ---------- PROGRESS BAR ---------- */
#progress{
  position:fixed;top:0;left:0;height:3px;width:0;
  background:linear-gradient(90deg,var(--aqua),var(--leaf));
  z-index:100;transition:width .1s linear;
}

/* ---------- CHAPTER NAV ---------- */
#chapnav{
  position:fixed;top:0;left:0;right:0;z-index:90;
  display:flex;align-items:center;justify-content:center;gap:clamp(10px,2.4vw,30px);
  min-height:74px;padding:12px 16px;
  background:rgba(255,255,255,.94);backdrop-filter:blur(12px);
  border-bottom:1px solid rgba(255,255,255,.9);box-shadow:0 2px 18px rgba(9,64,102,.10);
  transform:translateY(-100%);transition:transform .5s ease;
}
#chapnav.show{transform:none}
#chapnav a{
  font-family:var(--mono);font-size:.6rem;letter-spacing:.22em;text-transform:uppercase;
  color:var(--ink-soft);text-decoration:none;transition:all .3s ease;white-space:nowrap;
  padding:10px 4px;
}
#chapnav a:hover,#chapnav a.active{color:var(--aqua)}
#chapnav .nav-logo{
  position:absolute;left:clamp(14px,2vw,30px);top:50%;transform:translateY(-50%);
  height:50px;width:auto;
}
@media (max-width:860px){#chapnav .nav-logo{display:none}}

/* ---------- KHUNG ẢNH ---------- */
.ph{
  position:relative;width:100%;aspect-ratio:16/9;overflow:hidden;border-radius:10px;
  border:3px solid var(--paper);
  background:linear-gradient(155deg,var(--sky-soft),#f4fbff);
  box-shadow:0 10px 26px rgba(9,64,102,.12);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;
}
.ph--tall{aspect-ratio:4/5}
.ph--wide{aspect-ratio:21/9}
.ph .lbl{
  font-family:var(--mono);font-size:.62rem;letter-spacing:.2em;text-transform:uppercase;
  color:var(--aqua);text-align:center;max-width:82%;line-height:1.9;
}
.ph img,.ph video,.ph iframe{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;border:0;
}
.ph:has(img) .lbl,.ph:has(video) .lbl,.ph:has(iframe) .lbl{display:none}
figure{margin:0}
figcaption{
  font-family:var(--sans);font-size:.78rem;font-weight:400;letter-spacing:.02em;
  color:var(--mist);margin-top:9px;line-height:1.55;font-style:italic;
}
.media-grid{display:grid;gap:22px;margin-top:54px}
.media-grid.cols-2{grid-template-columns:1fr 1fr}

/* ---------- HERO ---------- */
#hero{
  position:relative;min-height:100vh;
  display:flex;align-items:flex-end;
  overflow:hidden;padding:0 0 4vh;
}
.hero-bg{position:absolute;inset:0}
.hero-bg .ph{
  position:absolute;inset:0;width:100%;height:100%;aspect-ratio:auto;border:0;border-radius:0;
  justify-content:flex-start;padding-top:9vh;
}
.hero-bg .ph img{filter:brightness(.62) saturate(1)}
.hero-veil{
  position:absolute;inset:0;pointer-events:none;
  background:
    linear-gradient(180deg,rgba(8,44,70,.34) 0%,rgba(8,44,70,.16) 34%,rgba(9,48,74,.78) 80%,rgba(11,60,92,.94) 100%);
}
/* dải sóng trắng nối hero xuống phần nội dung sáng */
#hero::after{
  content:"";position:absolute;left:-2%;right:-2%;bottom:-1px;height:clamp(46px,7vw,96px);z-index:4;
  background:var(--ground);
  border-radius:50% 50% 0 0/100% 100% 0 0;
}
.hero-content{
  position:relative;z-index:3;max-width:1120px;margin:0 auto;padding:0 24px clamp(30px,5vw,64px);width:100%;
}
.hero-logo{
  display:block;height:clamp(92px,13vw,150px);width:auto;margin-bottom:34px;
  filter:drop-shadow(0 6px 24px rgba(0,0,0,.45));
}
.hero-eyebrow{
  font-family:var(--mono);font-size:.68rem;letter-spacing:.4em;text-transform:uppercase;
  color:#bfe6ff;margin-bottom:18px;display:flex;align-items:center;gap:14px;
}
.hero-eyebrow::before{content:"";width:44px;height:1px;background:#bfe6ff;opacity:.8}
h1{
  font-family:var(--serif);font-weight:700;letter-spacing:-.015em;
  font-size:clamp(1.95rem,5vw,3.95rem);
  line-height:1.16;margin:0;max-width:960px;text-wrap:balance;color:#fff;
  text-shadow:0 8px 50px rgba(3,26,44,.6);
}
.hero-sub{
  margin-top:26px;max-width:640px;color:#dbecf7;
  font-size:clamp(.95rem,1.6vw,1.06rem);font-weight:300;line-height:1.75;
  text-shadow:0 2px 18px rgba(3,26,44,.6);
}
.hero-sub b{color:#8fd8ff;font-weight:600}
.scroll-cue{
  position:absolute;bottom:clamp(56px,8vw,104px);right:clamp(24px,5vw,64px);
  z-index:5;display:flex;flex-direction:column;align-items:center;gap:10px;
  color:#cfe7f5;font-family:var(--mono);font-size:.6rem;letter-spacing:.35em;
  text-transform:uppercase;writing-mode:vertical-rl;
}
.scroll-cue .line{width:1px;height:52px;background:linear-gradient(#bfe6ff,transparent);
  animation:drip 2.2s ease-in-out infinite}
@keyframes drip{0%{transform:scaleY(0);transform-origin:top}55%{transform:scaleY(1);transform-origin:top}56%{transform-origin:bottom}100%{transform:scaleY(0);transform-origin:bottom}}

/* ---------- SAPO ---------- */
#sapo{padding:clamp(26px,4vw,54px) 24px 8px;background:var(--ground)}
.sapo-inner{max-width:820px;margin:0 auto}
.sapo-inner p{
  font-family:var(--serif);font-size:clamp(1.12rem,2.1vw,1.46rem);
  line-height:1.75;font-weight:500;color:var(--ink);
}
.sapo-inner p::first-letter{
  font-size:3.2em;float:left;line-height:.82;padding:6px 14px 0 0;
  color:var(--aqua);font-weight:700;
}

/* ---------- SHARED ---------- */
.section{position:relative;padding:clamp(72px,9vw,130px) 24px;scroll-margin-top:78px}
.wrap{max-width:1120px;margin:0 auto}
.narrow{max-width:820px;margin:0 auto}
/* vạch accent mở đầu mỗi chương */
.section>.wrap>.reveal>h2::before{
  content:"";display:block;width:52px;height:3px;margin-bottom:26px;border-radius:2px;
  background:var(--aqua);
}
.section.leaf-accent>.wrap>.reveal>h2::before{background:var(--leaf)}
h2{
  font-family:var(--serif);font-weight:700;letter-spacing:-.015em;
  font-size:clamp(1.6rem,3.6vw,2.7rem);line-height:1.18;max-width:820px;
  margin-bottom:34px;text-wrap:balance;color:var(--ink);
}
.article p{
  color:var(--ink-soft);font-weight:400;margin-bottom:1.5em;
  font-size:clamp(1rem,1.4vw,1.08rem);
}
.article p strong{color:var(--ink);font-weight:600}

/* ---------- REVEAL / WIPE / PARALLAX ---------- */
/* --- các kiểu ảnh hiện ra: mỗi khối một nhịp khác nhau --- */
.reveal-wipe>*{clip-path:inset(0 100% 0 0);transition:clip-path 1.15s cubic-bezier(.65,0,.2,1);transition-delay:inherit}
.reveal-wipe.wipe-right>*{clip-path:inset(0 0 0 100%)}          /* quét từ phải sang */
.reveal-wipe.wipe-up>*{clip-path:inset(100% 0 0 0)}             /* mở dần từ dưới lên */
.reveal-wipe.wipe-down>*{clip-path:inset(0 0 100% 0)}           /* đổ dần từ trên xuống */
.reveal-wipe.wipe-split>*{clip-path:inset(0 50% 0 50%)}         /* mở từ giữa ra hai bên */
.reveal-wipe.wipe-iris>*{clip-path:circle(0% at 50% 55%);transition:clip-path 1.25s cubic-bezier(.55,0,.25,1)}
.reveal-wipe.in>*{clip-path:inset(0 0 0 0)}
.reveal-wipe.wipe-iris.in>*{clip-path:circle(78% at 50% 55%)}

/* ảnh lùi nhẹ về đúng khuôn, kèm mờ dần
   (chỉ phóng khung ảnh, và cắt phần dôi ra để trang không cuộn ngang) */
.reveal-zoom{opacity:0;transition:opacity 1s ease;overflow:clip}
.reveal-zoom>.ph{transform:scale(1.07);transition:transform 1.25s cubic-bezier(.19,1,.22,1);transition-delay:inherit}
.reveal-zoom.in{opacity:1}
.reveal-zoom.in>.ph{transform:none}

/* ảnh trượt lên kèm mờ dần — dùng cho khung ảnh đơn */
.reveal-rise{opacity:0;transform:translateY(54px);transition:opacity 1s ease,transform 1.1s cubic-bezier(.19,1,.22,1)}
.reveal-rise.in{opacity:1;transform:none}
[data-parallax]{overflow:hidden}
[data-parallax] img{transform:translateY(var(--py,0)) scale(1.14);will-change:transform}
.hero-bg .ph img{transform:scale(var(--hz,1));transform-origin:50% 34%;will-change:transform}
.reveal{opacity:0;transform:translateY(36px);filter:blur(10px);
  transition:opacity .9s ease,transform .9s cubic-bezier(.19,1,.22,1),filter .9s ease}
.reveal.in{opacity:1;transform:none;filter:none}
.reveal-left{opacity:0;transform:translateX(-46px);filter:blur(10px);
  transition:opacity .9s ease,transform .9s cubic-bezier(.19,1,.22,1),filter .9s ease}
.reveal-left.in{opacity:1;transform:none;filter:none}

/* ---------- VIDEO PHỎNG VẤN ---------- */
.video-feature{max-width:1000px;margin:60px auto 56px;padding:0}
.video-shell{position:relative;border-radius:14px}
.video-shell::before{
  content:"";position:absolute;inset:-3px;border-radius:17px;z-index:0;
  background:linear-gradient(120deg,var(--aqua),var(--sky) 45%,var(--leaf));
  opacity:.85;
}
.video-frame{
  position:relative;z-index:1;aspect-ratio:16/9;border-radius:14px;overflow:hidden;
  background:#0b1c28;
}
.video-frame video,.video-frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0;object-fit:cover;background:#000}
.video-feature figcaption{
  font-family:var(--sans);font-size:.78rem;font-weight:400;letter-spacing:.02em;
  color:var(--mist);margin-top:12px;line-height:1.55;font-style:italic;text-align:center;
}
.video-kicker{
  font-family:var(--mono);font-size:.6rem;letter-spacing:.28em;text-transform:uppercase;
  color:var(--aqua);margin-bottom:12px;display:flex;align-items:center;gap:10px;justify-content:center;
}
.video-kicker::before,.video-kicker::after{content:"";width:26px;height:1px;background:var(--aqua);opacity:.55}

/* ---------- CLIP DỌC (reel) ---------- */
.reel{
  display:grid;grid-template-columns:minmax(0,300px) minmax(0,1fr);
  gap:clamp(22px,4vw,52px);align-items:center;
  margin:60px auto;max-width:900px;
}
.reel-media{
  position:relative;aspect-ratio:9/16;border-radius:16px;overflow:hidden;
  background:#0b1c28;border:1px solid var(--line);
  box-shadow:0 22px 48px rgba(13,58,88,.16);
}
.reel-media video,.reel-media iframe{position:absolute;inset:0;width:100%;height:100%;border:0;object-fit:cover;background:#000}
.reel-body .kicker{
  font-family:var(--mono);font-size:.62rem;letter-spacing:.3em;text-transform:uppercase;
  color:var(--leaf-deep);margin-bottom:14px;display:flex;align-items:center;gap:10px;
}
.reel-body .kicker::before{content:"";width:20px;height:1px;background:var(--leaf-deep);opacity:.7}
.reel-body h3{font-family:var(--serif);font-weight:700;font-size:clamp(1.25rem,2.2vw,1.62rem);line-height:1.3;margin-bottom:14px;color:var(--ink)}
.article .reel-body p{color:var(--ink-soft);font-weight:400;font-size:1rem;margin-bottom:1em}
.article .reel-body p:last-child{margin-bottom:0}
@media (max-width:760px){
  .reel{grid-template-columns:1fr;gap:22px}
  .reel-media{max-width:320px;margin:0 auto;width:100%}
}

/* ---------- HỎI - ĐÁP ---------- */
.qa{margin:44px 0 26px}
.qa-role{
  font-family:var(--mono);font-size:.62rem;letter-spacing:.3em;text-transform:uppercase;
  color:var(--leaf-deep);margin-bottom:10px;display:flex;align-items:center;gap:10px;
}
.qa-role::before{content:"";width:18px;height:1px;background:var(--leaf-deep);opacity:.7}
.qa-q{
  font-family:var(--serif);font-weight:500;font-style:italic;
  font-size:clamp(1.05rem,1.9vw,1.32rem);color:var(--aqua-dark);line-height:1.55;
}

/* ---------- QUOTE ---------- */
blockquote.big-quote{
  position:relative;margin:56px auto;max-width:860px;
  padding:clamp(30px,4vw,52px) clamp(24px,4vw,56px);
  border-left:4px solid var(--aqua);
  background:var(--paper);
  border-radius:0 10px 10px 0;box-shadow:0 12px 30px rgba(9,64,102,.12);
}
blockquote.big-quote::before{
  content:"\201C";position:absolute;top:-4px;left:22px;
  font-family:var(--serif);font-size:5.6rem;line-height:1;color:var(--aqua);opacity:.35;
}
blockquote.big-quote p{
  font-family:var(--serif);font-weight:500;
  font-size:clamp(1.1rem,2vw,1.42rem);line-height:1.65;color:var(--ink);
  margin:0;
}
blockquote.big-quote cite{
  display:block;margin-top:26px;font-style:normal;
  font-family:var(--mono);font-size:.66rem;letter-spacing:.22em;text-transform:uppercase;
  color:var(--mist);line-height:2;
}
blockquote.big-quote cite b{color:var(--aqua-deep);font-weight:500}
blockquote.big-quote.leaf{border-left-color:var(--leaf)}
blockquote.big-quote.leaf::before{color:var(--leaf)}
blockquote.big-quote.leaf cite b{color:var(--leaf-deep)}
.pull-quote{
  border-left:3px solid var(--aqua);padding:8px 0 8px 28px;margin:44px 0;
  font-family:var(--serif);font-weight:500;font-size:clamp(1.12rem,2vw,1.36rem);
  line-height:1.6;color:var(--aqua-dark);
}
.pull-quote.leaf{border-left-color:var(--leaf);color:var(--leaf-deep)}
.lead-quote{
  max-width:780px;margin:44px auto 60px;text-align:center;
  font-family:var(--serif);font-weight:500;
  font-size:clamp(1.2rem,2.2vw,1.62rem);line-height:1.6;color:var(--ink);
}
.lead-quote::after{
  content:"";display:block;width:52px;height:3px;margin:26px auto 0;border-radius:2px;
  background:linear-gradient(90deg,var(--aqua),var(--leaf));
}

/* ---------- BOX SỐ LIỆU ---------- */
.stat-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:1px;
  background:var(--line);border:1px solid var(--line);border-radius:12px;overflow:hidden;
  margin:56px 0;box-shadow:0 10px 26px rgba(9,64,102,.10);
}
.stat-grid.cols-3{grid-template-columns:repeat(3,1fr)}
.stat-grid.cols-5{grid-template-columns:repeat(5,1fr)}
.stat{background:var(--paper);padding:38px 26px}
.stat .num{
  font-family:var(--serif);font-weight:700;
  font-size:clamp(1.8rem,3.4vw,2.7rem);color:var(--aqua-deep);line-height:1.05;
}
.stat .num .unit{font-size:.4em;color:var(--leaf-deep);font-weight:600;margin-left:5px}
.stat .num .pre{font-size:.4em;color:var(--mist);font-weight:500;margin-right:5px}
.stat .lbl{margin-top:14px;color:var(--ink-soft);font-size:.84rem;font-weight:400;line-height:1.6}
.stat-grid.leaf .stat{background:var(--paper)}
.stat-grid.leaf .stat .num{color:var(--leaf-deep)}
.stat-grid.leaf .stat .num .unit{color:var(--aqua-deep)}
.box-title{
  font-family:var(--mono);font-size:.66rem;letter-spacing:.34em;text-transform:uppercase;
  color:var(--ink);margin:56px 0 -34px;display:flex;align-items:center;gap:14px;
}
.box-title::after{content:"";flex:1;height:1px;background:var(--line)}

/* ---------- CHU TRÌNH RPDCA ---------- */
.rpdca{
  display:grid;grid-template-columns:repeat(5,1fr);gap:14px;margin:56px 0;
}
.rp-step{
  position:relative;background:var(--paper);border:1px solid rgba(255,255,255,.9);
  border-top:3px solid var(--aqua);border-radius:0 0 12px 12px;
  padding:26px 20px 22px;box-shadow:0 10px 26px rgba(9,64,102,.10);
}
.rp-step:nth-child(2){border-top-color:#3ab4e2}
.rp-step:nth-child(3){border-top-color:#6cc38c}
.rp-step:nth-child(4){border-top-color:var(--leaf)}
.rp-step:nth-child(5){border-top-color:var(--leaf-deep)}
.rp-k{
  display:block;font-family:var(--serif);font-weight:700;font-size:2.1rem;line-height:1;
  color:var(--aqua);opacity:.28;margin-bottom:10px;
}
.rp-step b{display:block;font-family:var(--serif);font-size:1.02rem;color:var(--ink);margin-bottom:8px}
.article .rp-step p{margin:0;color:var(--ink-soft);font-size:.88rem;line-height:1.6;font-weight:400}
@media (max-width:900px){.rpdca{grid-template-columns:repeat(2,1fr)}}
@media (max-width:520px){.rpdca{grid-template-columns:1fr}}

/* ---------- THẺ KHÁI NIỆM ---------- */
.keyword-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin:50px 0}
.keyword-card{
  background:var(--paper);
  border:1px solid rgba(255,255,255,.9);border-top:3px solid var(--aqua);
  border-radius:0 0 12px 12px;padding:clamp(26px,3vw,34px) clamp(22px,3vw,28px);
  box-shadow:0 10px 26px rgba(9,64,102,.10);
}
.keyword-card:nth-child(2){border-top-color:var(--leaf)}
.keyword-card:nth-child(3){border-top-color:var(--aqua-deep)}
.keyword-card .kw{
  font-family:var(--serif);font-weight:700;font-size:1.4rem;color:var(--aqua-deep);margin-bottom:14px;
}
.keyword-card:nth-child(2) .kw{color:var(--leaf-deep)}
.keyword-card:nth-child(3) .kw{color:var(--aqua-dark)}
.keyword-card p{color:var(--ink-soft);font-weight:400;font-size:.95rem;line-height:1.75;margin:0}

/* ---------- HÀNH TRÌNH GIỌT NƯỚC ---------- */
.droplet{max-width:760px;margin:56px auto;position:relative;padding-left:46px}
.droplet::before{
  content:"";position:absolute;left:14px;top:6px;bottom:6px;width:2px;
  background:linear-gradient(180deg,var(--aqua),var(--leaf) 60%,transparent);
  opacity:.45;
}
.drop-step{position:relative;margin-bottom:34px}
.drop-step:last-child{margin-bottom:0}
.drop-step::before{
  content:"";position:absolute;left:-39px;top:9px;width:12px;height:12px;border-radius:50% 50% 50% 0;
  transform:rotate(-45deg);background:var(--aqua);box-shadow:0 0 0 4px rgba(10,162,224,.14);
}
.drop-step:nth-child(n+4)::before{background:var(--leaf);box-shadow:0 0 0 4px rgba(90,168,50,.14)}
.drop-step .dt{
  font-family:var(--mono);font-size:.62rem;letter-spacing:.28em;text-transform:uppercase;
  color:var(--aqua-deep);margin-bottom:6px;
}
.drop-step:nth-child(n+4) .dt{color:var(--leaf-deep)}
.article .drop-step p{margin:0;color:var(--ink-soft);font-size:1rem;font-weight:400}
@media (max-width:560px){.droplet{padding-left:34px}.droplet::before{left:8px}.drop-step::before{left:-32px}}

/* ---------- SCROLLMATION ---------- */
.scrolly{position:relative;margin:70px calc(50% - var(--vw)/2) 0;width:var(--vw)}
.scrolly-media{position:sticky;top:0;height:100vh;overflow:hidden}
.scrolly-media img{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;
  opacity:0;transform:scale(1.07);
  transition:opacity 1s ease,transform 7s linear;
}
.scrolly-media img.on{opacity:1;transform:scale(1)}
.scrolly-veil{
  position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(255,255,255,.28) 0%,rgba(255,255,255,0) 22%,rgba(255,255,255,0) 72%,rgba(255,255,255,.3) 100%);
}
.scrolly-steps{position:relative;z-index:2;margin-top:-100vh}
.step{min-height:100vh;display:flex;align-items:center;padding:0 clamp(20px,6vw,80px)}
.step:nth-child(even){justify-content:flex-end}
.step-card{
  max-width:440px;padding:30px 34px;border-radius:14px;
  background:rgba(255,255,255,.93);backdrop-filter:blur(10px);
  border:1px solid rgba(255,255,255,.9);
  box-shadow:0 20px 50px rgba(9,48,74,.18);
  opacity:.25;transform:translateY(28px);
  transition:opacity .6s ease,transform .6s cubic-bezier(.19,1,.22,1);
}
.step.on .step-card{opacity:1;transform:none}
.step-card .kicker{
  font-family:var(--mono);font-size:.62rem;letter-spacing:.3em;
  text-transform:uppercase;color:var(--leaf-deep);margin-bottom:12px;
}
.step-card h3{font-family:var(--serif);font-weight:700;font-size:1.35rem;line-height:1.3;margin-bottom:12px;color:var(--ink)}
.article .step-card p{color:var(--ink-soft);font-weight:400;font-size:.98rem;margin:0}
@media (max-width:560px){
  .step{align-items:flex-end;padding-bottom:10vh}
  .step:nth-child(even){justify-content:flex-start}
  .step-card{max-width:100%}
}

/* ---------- SECTION BACKGROUNDS (dải xanh nhạt xen trắng) ---------- */
#ch1{background:var(--ground)}
#ch2{background:linear-gradient(180deg,var(--ground),var(--ground-deep) 26%,var(--ground-deep) 74%,var(--ground))}
#ch4{background:var(--ground)}
#ch5{background:linear-gradient(180deg,var(--ground),var(--ground-deep) 22%,var(--ground-deep) 78%,var(--ground))}
#ch6{background:var(--ground)}
#ch7{
  padding-bottom:0;
  background:
    radial-gradient(ellipse at 50% 118%,rgba(10,162,224,.22),transparent 60%),
    linear-gradient(180deg,var(--ground),var(--ground-deep));
}

/* ---------- LIGHTBOX ---------- */
#lightbox{
  position:fixed;inset:0;z-index:200;display:none;
  flex-direction:column;align-items:center;justify-content:center;gap:16px;
  background:rgba(9,32,48,.9);padding:4vh 4vw;cursor:zoom-out;
}
#lightbox.open{display:flex}
#lightbox img{max-width:100%;max-height:84vh;object-fit:contain;border-radius:8px}
#lightbox .cap{color:#d7e8f2;font-size:.95rem;text-align:center;max-width:720px}
.ph img{cursor:zoom-in}
.hero-bg .ph img,.scrolly-media img{cursor:default}

/* ---------- NÚT VỀ ĐẦU TRANG ---------- */
#toTop{
  position:fixed;right:22px;bottom:22px;z-index:95;
  width:46px;height:46px;border-radius:50%;
  border:1px solid var(--line);background:#fff;
  color:var(--aqua);font-size:1.15rem;line-height:1;cursor:pointer;
  box-shadow:0 6px 20px rgba(9,48,74,.14);
  opacity:0;pointer-events:none;transition:opacity .4s ease,transform .3s ease;
}
#toTop.show{opacity:1;pointer-events:auto}
#toTop:hover{transform:translateY(-3px);border-color:var(--aqua)}

/* ---------- FOOTER ---------- */
footer{
  margin:70px calc(50% - var(--vw)/2) 0;width:var(--vw);max-width:none;
  padding:clamp(46px,6vw,76px) clamp(24px,6vw,80px) clamp(40px,5vw,60px);
  background:linear-gradient(180deg,#0f4a70,#0a3552);
  color:rgba(255,255,255,.7);
  font-family:var(--sans);font-size:.86rem;letter-spacing:0;line-height:1.7;
}
.footer-inner{max-width:1080px;margin:0 auto;display:flex;flex-direction:column;gap:clamp(28px,3.5vw,42px)}
.footer-brand{display:flex;align-items:center;gap:clamp(18px,3vw,34px);flex-wrap:wrap}
.footer-logo{height:56px;width:auto;flex:none}
.footer-title{
  font-family:var(--serif);font-weight:600;color:#fff;
  font-size:clamp(1rem,1.7vw,1.22rem);line-height:1.4;max-width:620px;
}
.credit-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(168px,1fr));gap:20px 26px;
  padding-top:clamp(24px,3vw,32px);border-top:1px solid rgba(255,255,255,.16);
}
.credit span{
  display:block;font-family:var(--mono);font-size:.58rem;letter-spacing:.24em;
  text-transform:uppercase;color:rgba(255,255,255,.5);margin-bottom:5px;
}
.credit b{color:#fff;font-weight:500;font-size:.92rem}
.footer-links{
  display:flex;flex-direction:column;gap:10px;
  padding-top:clamp(22px,3vw,30px);border-top:1px solid rgba(255,255,255,.16);
}
footer .back-link{
  display:inline-flex;align-items:center;gap:9px;color:#9fdcff;
  text-decoration:none;width:fit-content;font-size:.9rem;transition:color .25s ease;
}
footer .back-link::before{content:"←";opacity:.75}
footer .back-link:hover{color:#fff}

@media (max-width:900px){
  .stat-grid,.stat-grid.cols-3,.stat-grid.cols-5{grid-template-columns:repeat(2,1fr)}
  .keyword-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:560px){
  .stat-grid,.stat-grid.cols-3,.stat-grid.cols-5{grid-template-columns:1fr}
  .media-grid.cols-2{grid-template-columns:1fr}
  .keyword-grid{grid-template-columns:1fr}
  #chapnav{min-height:0;padding:14px 16px;gap:14px;overflow-x:auto;justify-content:flex-start;-webkit-overflow-scrolling:touch;
    mask-image:linear-gradient(90deg,transparent,#000 20px,#000 calc(100% - 28px),transparent);
    -webkit-mask-image:linear-gradient(90deg,transparent,#000 20px,#000 calc(100% - 28px),transparent)}
  .scroll-cue{display:none}
  /* khung hero cao hơn để chừa nhiều ảnh rừng phía trên khối chữ */
  #hero{padding-bottom:6vh;min-height:104vh}
  .hero-bg .ph img{filter:brightness(.5) saturate(.95)}
  .hero-veil{
    background:linear-gradient(180deg,rgba(8,44,70,.42) 0%,rgba(8,44,70,.2) 28%,rgba(9,48,74,.78) 62%,rgba(11,60,92,.95) 100%);
  }
  .hero-content::before{
    content:"";position:absolute;left:-24px;right:-24px;top:-56px;bottom:-40vh;z-index:-1;
    background:linear-gradient(180deg,transparent,rgba(7,40,64,.68) 26%,rgba(8,46,72,.9) 62%,rgba(10,56,86,.96));
  }
  .hero-logo{height:clamp(58px,15vw,84px);margin-bottom:22px}
  .hero-eyebrow{font-size:.6rem;letter-spacing:.28em;margin-bottom:14px}
  .hero-eyebrow::before{width:26px}
  .hero-sub{margin-top:18px}
  #sapo{padding-top:32px}
  .section{padding:56px 18px}
  .media-grid{gap:14px;margin-top:36px}
  blockquote.big-quote{margin:36px auto}
  .stat{padding:28px 22px}
  h2{margin-bottom:24px}
  .box-title{margin:44px 0 -30px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  .reveal,.reveal-left{opacity:1;transform:none;filter:none}
  .reveal-wipe>*{clip-path:none!important}
  [data-parallax] img{transform:none}
}
a:focus-visible,button:focus-visible{outline:2px solid var(--aqua);outline-offset:4px}

/* ---------- TOAST ---------- */
#toast{
  position:fixed;bottom:30px;left:50%;transform:translateX(-50%) translateY(100px);
  background:var(--aqua);color:#fff;
  padding:12px 24px;border-radius:30px;font-family:var(--sans);font-weight:600;
  font-size:.9rem;z-index:300;box-shadow:0 10px 30px rgba(9,48,74,.28);
  pointer-events:none;opacity:0;transition:transform .4s cubic-bezier(.175,.885,.32,1.275),opacity .3s ease;
}
#toast.show{transform:translateX(-50%) translateY(0);opacity:1}

/* ---------- NÚT CHIA SẺ NỔI ---------- */
.share-float-container{
  position:fixed;right:22px;bottom:78px;z-index:95;
  display:flex;flex-direction:column;align-items:center;gap:10px;
  opacity:0;pointer-events:none;transition:opacity .4s ease,transform .3s ease;
}
.share-float-container.show{opacity:1;pointer-events:auto}
.share-float-trigger{
  width:46px;height:46px;border-radius:50%;
  border:1px solid var(--line);background:#fff;
  color:var(--aqua);display:flex;align-items:center;justify-content:center;cursor:pointer;
  transition:all .3s ease;box-shadow:0 6px 20px rgba(9,48,74,.14);outline:none;
}
.share-float-trigger:hover,.share-float-container.open .share-float-trigger{
  transform:scale(1.05);border-color:var(--aqua);background:var(--aqua);color:#fff;
}
.share-float-menu{
  display:flex;flex-direction:column;gap:8px;
  opacity:0;transform:translateY(15px) scale(0.9);pointer-events:none;
  transition:opacity .3s ease,transform .3s cubic-bezier(.175,.885,.32,1.275);
}
.share-float-container.open .share-float-menu{opacity:1;transform:none;pointer-events:auto}
.share-float-item{
  width:38px;height:38px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;cursor:pointer;
  border:1px solid var(--line);background:#fff;
  color:var(--mist);transition:all .3s ease;outline:none;
  box-shadow:0 4px 14px rgba(9,48,74,.1);
}
.share-float-item:hover{color:var(--ink);border-color:var(--ink-soft)}
.share-float-item.share-fb:hover{background:#1877f2;color:#fff;border-color:#1877f2}
.share-float-item.share-zl:hover{background:#0068ff;color:#fff;border-color:#0068ff}
.share-float-item.share-cp:hover{background:var(--aqua);color:#fff;border-color:var(--aqua)}

/* ---------- KHỐI CHIA SẺ CUỐI BÀI ---------- */
.share-block{
  padding:38px 24px 0;margin:56px auto 0;
  max-width:820px;text-align:center;
  border-top:1px solid rgba(13,63,94,.16);
}
.share-title{
  font-family:var(--mono);font-size:.66rem;font-weight:500;text-transform:uppercase;
  color:var(--mist);margin-bottom:18px;letter-spacing:.3em;
}
.share-row{display:flex;justify-content:center;align-items:center;gap:16px;flex-wrap:wrap}
.share-link{
  display:inline-flex;align-items:center;gap:10px;
  padding:10px 22px;border-radius:30px;
  font-family:var(--sans);font-size:.86rem;font-weight:500;
  text-decoration:none;cursor:pointer;transition:all .3s ease;
  background:var(--paper);border:1px solid var(--line);color:var(--ink-soft);outline:none;
  box-shadow:0 3px 10px rgba(9,64,102,.08);
}
.share-link:hover{color:var(--ink);border-color:var(--ink-soft)}
.share-link.share-fb:hover{background:rgba(24,119,242,.1);color:#1877f2;border-color:rgba(24,119,242,.35)}
.share-link.share-zl:hover{background:rgba(0,104,255,.1);color:#0068ff;border-color:rgba(0,104,255,.35)}
.share-link.share-cp:hover{background:rgba(10,162,224,.1);color:var(--aqua-deep);border-color:rgba(10,162,224,.4)}
.share-link svg{flex-shrink:0}

/* ==========================================================================
   CÁC KIỂU CHUYỂN ĐỘNG THEO CUỘN — lối dựng của Shorthand
   ========================================================================== */

/* ---------- 1. TẤM CHUYỂN CHƯƠNG TRÀN VIỀN, HAI ẢNH HOÀ VÀO NHAU ----------
   Ảnh được ghim đứng yên, chữ trôi qua; cuộn tới đâu ảnh sau hiện dần đè lên
   ảnh trước, kèm chữ lớn nổi giữa khung. */
.transition{position:relative;margin:clamp(70px,9vw,120px) calc(50% - var(--vw)/2) 0;width:var(--vw);height:200vh;overflow-x:clip}
.transition-stage{position:sticky;top:0;height:100vh;overflow:hidden}
.transition-stage img{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;
  transform:scale(calc(1 + var(--tz,0) * .12));
  will-change:transform,opacity;
}
.transition-stage img:first-of-type{opacity:1}
.transition-stage img:last-of-type{opacity:var(--tx,0)}
.transition-veil{
  position:absolute;inset:0;
  background:
    radial-gradient(ellipse 78% 52% at 50% 50%,rgba(4,28,46,.74),rgba(4,28,46,.3) 70%,transparent),
    linear-gradient(180deg,rgba(5,32,52,.62),rgba(5,32,52,.42) 45%,rgba(5,32,52,.78));
}
.transition-text{
  position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  padding:0 clamp(24px,7vw,90px);text-align:center;
}
.transition-text p{
  font-family:var(--serif);font-weight:700;color:#fff;margin:0;
  font-size:clamp(1.6rem,4.4vw,3.3rem);line-height:1.24;max-width:20ch;letter-spacing:-.01em;
  text-shadow:0 6px 30px rgba(2,20,34,.85),0 2px 8px rgba(2,20,34,.6);
  opacity:var(--tt,0);transform:translateY(calc((1 - var(--tt,0)) * 26px));
}
.transition-text p span,.transition-text p b{display:block;text-wrap:balance}
.transition-text p b{color:#8fd8ff;font-weight:700;margin-top:.18em}
/* hai vệt cong trắng khép tấm chuyển vào nền xanh của trang */
.transition::before,.transition::after{
  content:"";position:absolute;left:0;right:0;height:clamp(30px,4vw,58px);z-index:3;
  pointer-events:none;
}
.transition::before{top:-1px;background:radial-gradient(150% 100% at 50% 0,var(--ground) 99.5%,transparent 100%)}
.transition::after{bottom:-1px;background:radial-gradient(150% 100% at 50% 100%,var(--ground) 99.5%,transparent 100%)}

/* ---------- 2. KEN BURNS THEO CUỘN ----------
   Ảnh phóng và dịch rất chậm suốt quãng nó nằm trong khung nhìn. */
[data-kenburns]{overflow:hidden}
[data-kenburns] img{
  transform:scale(calc(1.1 + var(--kb,0) * .1)) translate3d(0,calc(var(--kb,0) * -2.5%),0);
  will-change:transform;
}

/* ---------- 3. DẢI ẢNH TRÔI NGANG KHI CUỘN DỌC ---------- */
.hstrip{position:relative;margin:clamp(56px,7vw,86px) calc(50% - var(--vw)/2) 0;width:var(--vw);height:190vh;overflow-x:clip}
.hstrip-stage{position:sticky;top:0;height:100vh;display:flex;align-items:center;overflow:hidden}
.hstrip-track{
  display:flex;gap:clamp(14px,2vw,26px);padding:0 6vw;
  transform:translate3d(calc(var(--hx,0) * -1px),0,0);will-change:transform;
}
.hstrip-item{flex:none;width:clamp(230px,32vw,460px)}
.hstrip-item .ph{aspect-ratio:3/4;margin:0}
.hstrip-item:nth-child(even) .ph{aspect-ratio:4/3}
.hstrip-item figcaption{color:var(--mist);margin-top:10px;max-width:34ch}
.hstrip-lead{
  position:absolute;left:6vw;top:clamp(60px,9vh,110px);z-index:2;max-width:min(420px,64vw);
  font-family:var(--mono);font-size:.64rem;letter-spacing:.3em;text-transform:uppercase;color:var(--aqua-deep);
}
@media (max-width:760px){
  .transition{height:150vh}
  /* trên điện thoại: bỏ ghim, cho vuốt ngang bằng tay — không còn cảm giác trang bị trôi */
  .hstrip{height:auto;margin-top:clamp(40px,8vw,56px)}
  .hstrip-stage{position:static;height:auto;display:block;overflow:visible}
  .hstrip-lead{position:static;margin:0 0 16px 24px}
  .hstrip-track{
    transform:none;overflow-x:auto;overflow-y:hidden;
    padding:0 24px 12px;scroll-snap-type:x mandatory;
    scrollbar-width:none;-webkit-overflow-scrolling:touch;
  }
  .hstrip-track::-webkit-scrollbar{display:none}
  .hstrip-item{width:76vw;scroll-snap-align:center}
  .hstrip-item .ph,.hstrip-item:nth-child(even) .ph{aspect-ratio:3/4}
}

@media (prefers-reduced-motion:reduce){
  .transition{height:auto}
  .transition-stage{position:static;height:auto;aspect-ratio:16/9}
  .transition-stage img{transform:none}
  .transition-stage img:last-of-type{opacity:1}
  .transition-text p{opacity:1;transform:none}
  [data-kenburns] img{transform:none}
  .hstrip{height:auto;margin-top:40px}
  .hstrip-stage{position:static;height:auto;display:block}
  .hstrip-track{transform:none;overflow-x:auto;padding:0 24px 10px;scroll-snap-type:x mandatory}
  .hstrip-item{scroll-snap-align:center}
}