/* ==========================================================================
   xuanphucloc.com — Sổ tay 100 ngày cầm bút
   Brand: MỰC TÍM + GIẤY KEM (sinh từ chính cuốn vở chép tay của chị Xuân)
   Luật chữ: TO – ĐẬM – RÕ. Font Việt an toàn: Playfair Display + Lora (Google,
   có subset vietnamese). CẤM Georgia/Times cho chữ Việt.
   ========================================================================== */
:root{
  --paper:#F6EFDC;
  --paper-hi:#FCF7EA;
  --card:#FBF5E4;
  --ink:#241A44;          /* tím than — chữ chính */
  --violet:#4B3A8F;       /* mực tím — heading, link */
  --violet-deep:#372A6E;
  --red:#A72F16;          /* mực đỏ — ngày, nhấn */
  --blue-ink:#2B4A8C;     /* mực xanh — phụ */
  --line:rgba(120,140,172,.30);   /* kẻ ô ly */
  --gold:#9A7B33;
  --disp:"Playfair Display",serif;
  --serif:"Lora",serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--paper);color:var(--ink);font-family:var(--serif);font-size:19px;line-height:1.75}
img{max-width:100%;height:auto}
a{color:var(--violet)}

/* ---- header ---- */
header.site{position:sticky;top:0;z-index:50;background:rgba(246,239,220,.94);backdrop-filter:blur(6px);border-bottom:1.5px solid rgba(75,58,143,.25)}
.nav{max-width:1060px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:14px 22px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink)}
.brand .mono{display:inline-grid;place-items:center;width:44px;height:44px;border:2px solid var(--violet);border-radius:50%;font-family:var(--disp);font-weight:800;font-size:15px;color:var(--violet);letter-spacing:.5px}
.brand-name{font-family:var(--disp);font-weight:800;font-size:21px}
nav.links{display:flex;gap:26px}
nav.links a{font-weight:600;font-size:17.5px;text-decoration:none;color:var(--violet-deep)}
nav.links a:hover{color:var(--red)}
.navtoggle{display:none;background:none;border:1.5px solid var(--violet);color:var(--violet);font-size:16px;padding:7px 12px;border-radius:6px;font-family:var(--serif)}
@media(max-width:760px){
  .navtoggle{display:block}
  nav.links{display:none;position:absolute;right:16px;top:64px;background:var(--paper-hi);border:1.5px solid var(--violet);flex-direction:column;gap:0;min-width:220px;box-shadow:0 12px 30px rgba(36,26,68,.18)}
  nav.links.open{display:flex}
  nav.links a{padding:14px 18px;border-bottom:1px solid rgba(75,58,143,.15)}
}

/* ---- hero ---- */
.hero{max-width:1060px;margin:0 auto;padding:72px 22px 30px;text-align:center}
.hero .eyebrow{font-size:15.5px;letter-spacing:.24em;text-transform:uppercase;color:var(--gold);font-weight:700}
.hero h1{font-family:var(--disp);font-weight:800;font-size:clamp(44px,7vw,72px);color:var(--violet-deep);margin:14px 0 10px}
.hero .sub{font-size:clamp(19px,2.6vw,23px);color:var(--ink);max-width:34em;margin:0 auto 14px}
.hero .sub em{color:var(--violet)}

/* ---- notebook card (trang vở ô ly) ---- */
.notecard{position:relative;background:
  linear-gradient(var(--line) 1px,transparent 1px),
  linear-gradient(90deg,var(--line) 1px,transparent 1px),
  var(--card);
  background-size:26px 26px,26px 26px,auto;
  border:1px solid rgba(75,58,143,.28);
  box-shadow:0 14px 34px rgba(36,26,68,.14);
  padding:34px 34px 30px 58px;text-align:left}
.notecard::before{content:"";position:absolute;top:8px;bottom:8px;left:38px;width:1.6px;background:rgba(203,84,80,.55)}
.notecard .ndate{font-size:15.5px;font-weight:700;color:var(--red);letter-spacing:.06em;margin-bottom:8px}
.notecard .ntext{font-size:clamp(20px,2.6vw,24px);line-height:1.65;color:var(--violet-deep);font-style:italic;font-weight:500}
.notecard .nsrc{margin-top:12px;font-size:15.5px;color:var(--blue-ink)}
.hero .notecard{max-width:640px;margin:26px auto 0;transform:rotate(-.6deg)}

.cta{display:inline-block;margin-top:34px;background:var(--violet);color:#FCF7EA;text-decoration:none;font-weight:700;font-size:18.5px;letter-spacing:.04em;padding:16px 34px;border-radius:4px;box-shadow:0 10px 24px rgba(75,58,143,.32)}
.cta:hover{background:var(--violet-deep)}
.cta.ghost{background:transparent;color:var(--violet);border:2px solid var(--violet);box-shadow:none}

/* ---- số liệu ---- */
.stats{max-width:900px;margin:56px auto 0;padding:0 22px;display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.stat{background:var(--paper-hi);border:1.5px solid rgba(75,58,143,.30);padding:26px 14px;text-align:center}
.stat b{display:block;font-family:var(--disp);font-size:44px;font-weight:800;color:var(--violet-deep);line-height:1.1}
.stat span{font-size:16.5px;color:var(--ink)}
@media(max-width:640px){.stats{grid-template-columns:1fr;max-width:420px}}

/* ---- section ---- */
section.blk{max-width:1060px;margin:0 auto;padding:72px 22px 10px}
section.blk h2{font-family:var(--disp);font-weight:800;font-size:clamp(30px,4.4vw,42px);color:var(--violet-deep);margin-bottom:8px}
section.blk .lede{font-size:19.5px;max-width:44em;color:var(--ink)}
.rule{width:110px;height:3px;background:var(--gold);margin:18px 0 26px}

.about p{margin:0 0 18px;max-width:46em}
.about .quote-thay{border-left:4px solid var(--violet);background:var(--paper-hi);padding:20px 24px;margin:26px 0;font-style:italic;font-size:20px;color:var(--violet-deep);max-width:46em}
.about .quote-thay small{display:block;margin-top:8px;font-style:normal;font-size:15.5px;color:var(--blue-ink)}

/* ---- lưới trích đoạn ---- */
.notes-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:26px;margin-top:10px}
.notes-grid .notecard{transform:rotate(-.4deg)}
.notes-grid .notecard:nth-child(2n){transform:rotate(.5deg)}
.notes-grid .notecard .ntext{font-size:20px}

/* ---- footer ---- */
footer.site{margin-top:90px;background:var(--violet-deep);color:#EDE7F8;padding:44px 22px 40px;text-align:center}
footer.site .fname{font-family:var(--disp);font-weight:800;font-size:24px;color:#FCF7EA}
footer.site p{font-size:16.5px;max-width:40em;margin:10px auto 0}
footer.site a{color:#D9C77A}