/* ============================================================
   TBH Xinh Nguyễn — design system (tông đồng cỏ)
   ============================================================ */

/* ---------- fonts (self-hosted Be Vietnam Pro) ---------- */
@font-face{font-family:'Be Vietnam Pro';font-style:normal;font-weight:400;font-display:swap;
  src:url(../fonts/bvp-400-vietnamese.woff2) format('woff2');
  unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB;}
@font-face{font-family:'Be Vietnam Pro';font-style:normal;font-weight:400;font-display:swap;
  src:url(../fonts/bvp-400-latin.woff2) format('woff2');
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;}
@font-face{font-family:'Be Vietnam Pro';font-style:normal;font-weight:500;font-display:swap;
  src:url(../fonts/bvp-500-vietnamese.woff2) format('woff2');
  unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB;}
@font-face{font-family:'Be Vietnam Pro';font-style:normal;font-weight:500;font-display:swap;
  src:url(../fonts/bvp-500-latin.woff2) format('woff2');
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;}
@font-face{font-family:'Be Vietnam Pro';font-style:normal;font-weight:600;font-display:swap;
  src:url(../fonts/bvp-600-vietnamese.woff2) format('woff2');
  unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB;}
@font-face{font-family:'Be Vietnam Pro';font-style:normal;font-weight:600;font-display:swap;
  src:url(../fonts/bvp-600-latin.woff2) format('woff2');
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;}
@font-face{font-family:'Be Vietnam Pro';font-style:normal;font-weight:700;font-display:swap;
  src:url(../fonts/bvp-700-vietnamese.woff2) format('woff2');
  unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB;}
@font-face{font-family:'Be Vietnam Pro';font-style:normal;font-weight:700;font-display:swap;
  src:url(../fonts/bvp-700-latin.woff2) format('woff2');
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;}
@font-face{font-family:'Be Vietnam Pro';font-style:normal;font-weight:800;font-display:swap;
  src:url(../fonts/bvp-800-vietnamese.woff2) format('woff2');
  unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB;}
@font-face{font-family:'Be Vietnam Pro';font-style:normal;font-weight:800;font-display:swap;
  src:url(../fonts/bvp-800-latin.woff2) format('woff2');
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;}

/* ---------- tokens ---------- */
:root{
  /* --- bảng màu "bức tranh đồng cỏ": núi xa, dòng sông, cỏ xanh, bồ công anh --- */
  --meadow:#2f6b47;        /* xanh đồng cỏ — màu chính */
  --meadow-700:#235138;
  --meadow-300:#5f9c79;
  --stem:#1f4a33;          /* cọng cỏ, cuống hoa */
  --river:#2b7d93;         /* xanh dòng sông */
  --river-soft:#7cc0d2;
  --mountain:#56798f;      /* xanh xám dãy núi xa */
  --sky-1:#dceff7;         /* trời cao */
  --sky-2:#f2f6e8;         /* trời sát chân núi, ngả nắng */
  --sun:#8f6516;           /* nắng chiều — đủ tương phản để làm màu chữ */
  --sun-soft:#dcab45;      /* nhụy bồ công anh — chỉ dùng trang trí */
  --seed:#ffffff;          /* hạt bồ công anh bay trong gió */
  --seed-shadow:rgba(20,45,32,.22);

  /* tên cũ giữ lại làm bí danh, để toàn bộ quy tắc sẵn có vẫn chạy */
  --plum:var(--meadow);
  --plum-700:var(--meadow-700);
  --plum-300:var(--meadow-300);
  --gold:var(--sun);
  --gold-soft:var(--sun-soft);

  --bg:#f6faf5;
  --bg-alt:#e9f3ea;
  --surface:#ffffff;
  --surface-2:#f2f8f2;
  --text:#16241c;
  --text-soft:#47584e;
  --text-faint:#6e8177;
  --line:#d6e5d9;
  --line-strong:#b3ccba;
  --ring:#2f6b47;
  --on-primary:#ffffff;
  --shadow-sm:0 1px 2px rgba(22,36,28,.06),0 2px 8px rgba(22,36,28,.05);
  --shadow-md:0 4px 10px rgba(22,36,28,.07),0 14px 36px rgba(22,36,28,.09);

  --radius:14px;
  --radius-lg:22px;
  --maxw:1140px;
  --gutter:16px;
  --font:'Be Vietnam Pro',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
}
:root[data-theme="dark"]{
  /* đồng cỏ lúc chạng vạng */
  --meadow:#7fc99f;
  --meadow-700:#9bdcb7;
  --meadow-300:#58a27c;
  --stem:#4e9777;
  --river:#58b4cc;
  --river-soft:#9ad9e8;
  --mountain:#36596d;
  --sky-1:#13232c;
  --sky-2:#182a23;
  --sun:#e6bc63;
  --sun-soft:#f2d28d;
  --seed:#eef6ef;
  --seed-shadow:rgba(0,0,0,.35);

  --plum:var(--meadow);
  --plum-700:var(--meadow-700);
  --plum-300:var(--meadow-300);
  --gold:var(--sun);
  --gold-soft:var(--sun-soft);

  --bg:#0f1714;
  --bg-alt:#14201b;
  --surface:#19251f;
  --surface-2:#1f2e27;
  --text:#eef5f0;
  --text-soft:#b6c7bd;
  --text-faint:#8a9d93;
  --line:#2a3a32;
  --line-strong:#3e5447;
  --ring:#7fc99f;
  --on-primary:#0f1714;
  --shadow-sm:0 1px 2px rgba(0,0,0,.4);
  --shadow-md:0 10px 34px rgba(0,0,0,.45);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:84px}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms!important;transition-duration:.001ms!important}}
body{
  margin:0;font-family:var(--font);font-weight:400;font-size:16px;line-height:1.7;
  color:var(--text);background:var(--bg);
  -webkit-font-smoothing:antialiased;overflow-wrap:break-word;
}
img{max-width:100%;display:block}
h1,h2,h3,h4{line-height:1.22;letter-spacing:-.02em;margin:0 0 .5em;font-weight:800}
p{margin:0 0 1em}
a{color:var(--plum);text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:var(--gold)}
:focus-visible{outline:3px solid var(--ring);outline-offset:2px;border-radius:6px}
button{font:inherit;color:inherit}
.sr{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip{position:absolute;left:-9999px;top:8px;z-index:200;background:var(--plum);color:#fff;padding:10px 16px;border-radius:10px}
:root[data-theme="dark"] .skip{color:var(--on-primary)}
.skip:focus{left:16px}
.wrap{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:48px;padding:12px 22px;border-radius:999px;border:1.5px solid transparent;
  font-weight:600;font-size:1rem;text-decoration:none;cursor:pointer;
  transition:transform .15s ease,box-shadow .2s ease,background-color .2s ease,color .2s ease;
}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--plum);color:#fff;box-shadow:var(--shadow-sm)}
:root[data-theme="dark"] .btn-primary{color:var(--on-primary)}
.btn-primary:hover{background:var(--plum-700);color:#fff;box-shadow:var(--shadow-md)}
:root[data-theme="dark"] .btn-primary:hover{color:var(--on-primary)}
.btn-ghost{background:transparent;color:var(--text);border-color:var(--line-strong)}
.btn-ghost:hover{background:var(--surface);border-color:var(--plum);color:var(--text)}
.btn-sm{min-height:40px;padding:8px 16px;font-size:.94rem}
.link-btn{background:none;border:0;padding:0;color:var(--plum);font-weight:600;text-decoration:underline;cursor:pointer}

/* ---------- header ---------- */
.site-head{position:sticky;top:0;z-index:100;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(12px);border-bottom:1px solid transparent;transition:border-color .2s,box-shadow .2s}
.site-head.is-stuck{border-bottom-color:var(--line);box-shadow:var(--shadow-sm)}
.head-inner{display:flex;align-items:center;gap:12px;min-height:68px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);margin-right:auto}
.brand-mark{display:grid;place-items:center;width:40px;height:40px;border-radius:12px;background:var(--plum);color:#fff;font-weight:800;font-size:.95rem;letter-spacing:.02em;flex:none}
:root[data-theme="dark"] .brand-mark{color:var(--on-primary)}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-text strong{font-size:1.02rem;font-weight:800;letter-spacing:-.01em}
.brand-text small{font-size:.74rem;color:var(--text-faint);letter-spacing:.06em;text-transform:uppercase}
.nav{display:none;gap:4px}
.nav a{padding:8px 12px;border-radius:999px;font-size:.94rem;font-weight:500;color:var(--text-soft);text-decoration:none}
.nav a:hover{background:var(--surface);color:var(--text)}
.head-actions{display:flex;gap:8px}
.icon-btn{display:grid;place-items:center;width:44px;height:44px;border-radius:12px;border:1px solid var(--line);background:var(--surface);cursor:pointer;font-size:1.05rem;line-height:1}
.icon-btn:hover{border-color:var(--plum)}
.ic-moon{display:none}
:root[data-theme="dark"] .ic-sun{display:none}
:root[data-theme="dark"] .ic-moon{display:inline}
.mobile-nav{display:flex;flex-direction:column;border-top:1px solid var(--line);background:var(--surface);padding:8px var(--gutter) 14px}
.mobile-nav[hidden]{display:none}
.mobile-nav a{padding:13px 8px;border-radius:10px;text-decoration:none;color:var(--text);font-weight:500;border-bottom:1px solid var(--line)}
.mobile-nav a:last-child{border-bottom:0}
@media (min-width:900px){
  .nav{display:flex}
  .menu-btn{display:none}
  .mobile-nav{display:none!important}
}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;padding:52px 0 44px;background:linear-gradient(180deg,var(--bg-alt),var(--bg))}
.hero-glow{position:absolute;inset:-30% -10% auto;height:520px;background:
  radial-gradient(42% 60% at 22% 30%,color-mix(in srgb,var(--plum) 22%,transparent),transparent 70%),
  radial-gradient(38% 55% at 78% 20%,color-mix(in srgb,var(--gold-soft) 26%,transparent),transparent 70%);
  pointer-events:none;filter:blur(6px)}
.hero-inner{position:relative}
.eyebrow{font-size:.78rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--gold);margin:0 0 14px}
.hero-title{font-size:clamp(2.3rem,9vw,4.4rem);margin:0 0 18px;letter-spacing:-.035em}
.grad{background:linear-gradient(100deg,var(--plum),var(--gold));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-sub{max-width:62ch;font-size:clamp(1rem,2.6vw,1.16rem);color:var(--text-soft);margin-bottom:26px}
.hero-sub strong{color:var(--text);font-weight:600}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px}
.hero-stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:34px 0 0;padding:0;max-width:520px}
.hero-stats div{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:14px 12px;box-shadow:var(--shadow-sm)}
.hero-stats dt{font-size:.74rem;color:var(--text-faint);letter-spacing:.04em;text-transform:uppercase}
.hero-stats dd{margin:4px 0 0;font-size:1.5rem;font-weight:800;color:var(--plum);letter-spacing:-.02em}
@media (min-width:900px){.hero{padding:86px 0 72px}}

/* ---------- sections ---------- */
.section{padding:56px 0}
.section-alt{background:var(--bg-alt)}
.sec-head{max-width:72ch;margin-bottom:30px}
.sec-head h2{font-size:clamp(1.55rem,5vw,2.3rem);margin:0 0 12px}
.sec-lead{color:var(--text-soft);margin:0;font-size:1.02rem}
.sec-lead strong{color:var(--text);font-weight:600}
@media (min-width:900px){.section{padding:84px 0}}

/* ---------- pillars ---------- */
.pillars{display:grid;gap:14px;grid-template-columns:1fr}
@media (min-width:640px){.pillars{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (min-width:1000px){.pillars{grid-template-columns:repeat(3,minmax(0,1fr))}}
.pillar{
  display:flex;flex-direction:column;gap:8px;padding:22px;border-radius:var(--radius-lg);
  background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow-sm);
  text-align:left;cursor:pointer;transition:transform .18s ease,box-shadow .2s ease,border-color .2s ease;
}
.pillar:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:color-mix(in srgb,var(--plum) 40%,var(--line))}
.pillar-ic{width:46px;height:46px;border-radius:14px;display:grid;place-items:center;font-size:1.35rem;background:color-mix(in srgb,var(--gold-soft) 22%,var(--surface-2));border:1px solid var(--line)}
.pillar h3{font-size:1.14rem;margin:6px 0 0}
.pillar p{color:var(--text-soft);font-size:.96rem;margin:0}
.pillar-meta{margin-top:auto;padding-top:12px;font-size:.84rem;font-weight:600;color:var(--gold)}

/* ---------- library tools ---------- */
.lib-tools{display:flex;flex-direction:column;gap:14px;margin-bottom:18px}
.search{position:relative;display:flex;align-items:center;background:var(--surface);border:1.5px solid var(--line);border-radius:999px;padding:0 14px;box-shadow:var(--shadow-sm)}
.search:focus-within{border-color:var(--plum)}
.search-ic{font-size:1.15rem;color:var(--text-faint);flex:none}
.search input{flex:1;min-width:0;border:0;background:none;outline:none;padding:14px 10px;font-size:1rem;color:var(--text)}
.search input::placeholder{color:var(--text-faint)}
.clear-q{border:0;background:var(--bg-alt);border-radius:999px;padding:6px 12px;font-size:.84rem;font-weight:600;cursor:pointer;color:var(--text-soft)}
.clear-q:hover{background:var(--line);color:var(--text)}
.chips{display:flex;gap:8px;overflow-x:auto;padding-bottom:4px;-webkit-overflow-scrolling:touch;scrollbar-width:thin}
.chip{
  flex:none;border:1.5px solid var(--line);background:var(--surface);color:var(--text-soft);
  border-radius:999px;padding:9px 16px;font-size:.92rem;font-weight:600;cursor:pointer;white-space:nowrap;min-height:42px;
}
.chip:hover{border-color:var(--plum);color:var(--text)}
.chip[aria-pressed="true"]{background:var(--plum);border-color:var(--plum);color:#fff}
:root[data-theme="dark"] .chip[aria-pressed="true"]{color:var(--on-primary)}
.lib-count{font-size:.9rem;color:var(--text-faint);margin:0 0 14px}

/* ---------- cards ---------- */
.cards{display:grid;gap:14px;grid-template-columns:1fr}
@media (min-width:660px){.cards{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (min-width:1020px){.cards{grid-template-columns:repeat(3,minmax(0,1fr))}}
.card{
  display:flex;flex-direction:column;gap:10px;text-align:left;padding:20px;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);
  box-shadow:var(--shadow-sm);cursor:pointer;transition:transform .18s ease,box-shadow .2s ease,border-color .2s;
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:color-mix(in srgb,var(--plum) 40%,var(--line))}
.card-top{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.tag{font-size:.75rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--plum);background:color-mix(in srgb,var(--plum) 12%,var(--surface-2));border-radius:999px;padding:5px 11px}
.read{font-size:.8rem;color:var(--text-faint)}
.card h3{font-size:1.1rem;margin:0}
.card p{color:var(--text-soft);font-size:.95rem;margin:0}
.card-more{margin-top:auto;padding-top:10px;font-size:.88rem;font-weight:700;color:var(--gold)}
.empty{background:var(--surface);border:1px dashed var(--line-strong);border-radius:var(--radius-lg);padding:28px;text-align:center}
.empty p{margin:0 0 6px}
.empty p:last-child{margin:0;color:var(--text-soft)}

/* ---------- road ---------- */
.road{list-style:none;counter-reset:step;margin:0;padding:0;display:grid;gap:12px}
@media (min-width:760px){.road{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (min-width:1060px){.road{grid-template-columns:repeat(3,minmax(0,1fr))}}
.road li{
  counter-increment:step;position:relative;padding:22px 22px 22px 66px;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);
}
.road li::before{
  content:counter(step);position:absolute;left:20px;top:22px;width:34px;height:34px;border-radius:50%;
  display:grid;place-items:center;font-weight:800;font-size:.95rem;
  background:var(--plum);color:#fff;
}
:root[data-theme="dark"] .road li::before{color:var(--on-primary)}
.road h3{font-size:1.06rem;margin:0 0 6px}
.road p{margin:0;color:var(--text-soft);font-size:.95rem}
.road .road-when{display:block;margin-top:10px;font-size:.82rem;font-weight:700;color:var(--gold);letter-spacing:.03em;text-transform:uppercase}

/* ---------- about ---------- */
.about{display:grid;gap:18px}
@media (min-width:920px){.about{grid-template-columns:1.1fr .9fr;align-items:start}}
.about-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);padding:26px;box-shadow:var(--shadow-sm)}
.avatar{width:72px;height:72px;border-radius:24px;display:grid;place-items:center;font-size:1.5rem;font-weight:800;background:linear-gradient(135deg,var(--plum),var(--gold));color:#fff;margin-bottom:16px}
.about-card h2{font-size:1.5rem;margin:0 0 4px}
.role{color:var(--gold);font-weight:600;margin:0 0 16px}
.about-card p{color:var(--text-soft)}
.about-card p strong{color:var(--text)}
.values{list-style:none;margin:0;padding:0;display:grid;gap:12px}
.values li{background:var(--surface);border:1px solid var(--line);border-left:4px solid var(--gold);border-radius:var(--radius);padding:18px 20px}
.values h3{font-size:1.02rem;margin:0 0 4px}
.values p{margin:0;color:var(--text-soft);font-size:.94rem}

/* ---------- contact ---------- */
.contact{display:grid;gap:12px}
@media (min-width:700px){.contact{grid-template-columns:repeat(3,minmax(0,1fr))}}
.contact a{
  display:flex;flex-direction:column;gap:4px;padding:20px;text-decoration:none;color:var(--text);
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);
  transition:transform .18s ease,box-shadow .2s ease,border-color .2s;
}
.contact a:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--plum);color:var(--text)}
.contact .c-ic{font-size:1.4rem}
.contact .c-label{font-size:.78rem;letter-spacing:.08em;text-transform:uppercase;color:var(--text-faint);font-weight:700}
.contact .c-value{font-weight:700;font-size:1.02rem;letter-spacing:-.01em}
.contact .c-note{font-size:.86rem;color:var(--text-soft)}

/* ---------- message form ---------- */
.msg-form{margin-top:28px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);padding:24px;box-shadow:var(--shadow-sm);max-width:720px}
.msg-form h3{font-size:1.06rem;margin:0 0 16px}
.msg-row{display:grid;gap:14px}
@media (min-width:560px){.msg-row{grid-template-columns:1fr 1fr}}
.msg-field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px;font-size:.9rem;font-weight:600;color:var(--text-soft)}
.msg-field input,.msg-field textarea{
  font:inherit;font-weight:400;color:var(--text);background:var(--surface-2);
  border:1.5px solid var(--line);border-radius:10px;padding:11px 13px;outline:none;resize:vertical;
}
.msg-field input:focus,.msg-field textarea:focus{border-color:var(--plum)}
.msg-hp{position:absolute;left:-9999px;width:1px;height:1px;opacity:0}
.msg-actions{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-top:4px}
.msg-status{margin:0;font-size:.9rem;color:var(--text-soft)}
.msg-status[data-state="ok"]{color:#2f7a4f}
.msg-status[data-state="err"]{color:#b4442f}
:root[data-theme="dark"] .msg-status[data-state="ok"]{color:#6fd999}
:root[data-theme="dark"] .msg-status[data-state="err"]{color:#ff9d84}

/* ---------- footer ---------- */
.site-foot{background:var(--plum);color:#fff;padding:36px 0}
:root[data-theme="dark"] .site-foot{background:#0b120f;border-top:1px solid var(--line)}
.site-foot .foot-brand{font-size:1rem;margin-bottom:14px}
.site-foot .note{font-size:.86rem;line-height:1.65;color:rgba(255,255,255,.76);max-width:90ch;border-left:3px solid var(--gold-soft);padding-left:14px}
.site-foot .copy{font-size:.84rem;color:rgba(255,255,255,.6);margin:0}

/* ---------- reader ---------- */
.reader{position:fixed;inset:0;z-index:150;background:var(--bg);overflow-y:auto;overscroll-behavior:contain}
.reader-bar{position:sticky;top:0;z-index:5;background:color-mix(in srgb,var(--bg) 92%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.reader-bar-inner{display:flex;align-items:center;gap:12px;min-height:62px}
.reader-crumb{font-size:.82rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--gold);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.progress{height:3px;background:var(--line)}
.progress span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--plum),var(--gold));transition:width .1s linear}
.reader-body{padding-top:30px;padding-bottom:12px;max-width:min(74ch,100%)}
.reader-body h1{font-size:clamp(1.7rem,6vw,2.6rem);letter-spacing:-.03em;margin-bottom:14px}
.doc-meta{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:0 0 22px;padding-bottom:20px;border-bottom:1px solid var(--line)}
.doc-lead{font-size:1.08rem;color:var(--text-soft);font-weight:500}
.reader-body h2{font-size:clamp(1.22rem,4vw,1.6rem);margin:34px 0 10px;padding-top:4px}
.reader-body h3{font-size:1.08rem;margin:22px 0 8px}
.reader-body p,.reader-body li{font-size:1.04rem;line-height:1.78}
.reader-body ul,.reader-body ol{padding-left:22px;margin:0 0 1.1em}
.reader-body li{margin-bottom:.5em}
.reader-body li strong{color:var(--text)}
.reader-body blockquote{margin:20px 0;padding:14px 20px;border-left:4px solid var(--gold);background:var(--surface-2);border-radius:0 var(--radius) var(--radius) 0;color:var(--text-soft);font-style:italic}
.reader-body table{width:100%;border-collapse:collapse;margin:18px 0;font-size:.96rem;display:block;overflow-x:auto}
.reader-body th,.reader-body td{border:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}
.reader-body th{background:var(--surface-2);font-weight:700}
.box{background:var(--surface);border:1px solid var(--line);border-left:4px solid var(--plum);border-radius:0 var(--radius) var(--radius) 0;padding:18px 20px;margin:24px 0;box-shadow:var(--shadow-sm)}
.box h3{margin-top:0;color:var(--plum)}
.box.drill{border-left-color:var(--gold)}
.box.drill h3{color:var(--gold)}
.box.warn{border-left-color:#b4442f;background:color-mix(in srgb,#b4442f 7%,var(--surface))}
.box.warn h3{color:#b4442f}
:root[data-theme="dark"] .box.warn{background:color-mix(in srgb,#ff7a5e 10%,var(--surface))}
:root[data-theme="dark"] .box.warn h3{color:#ff9d84}
.box p:last-child,.box ul:last-child,.box ol:last-child{margin-bottom:0}
.reader-nav{display:grid;gap:12px;padding-bottom:60px}
@media (min-width:700px){.reader-nav{grid-template-columns:1fr 1fr}}
.reader-nav a{
  display:flex;flex-direction:column;gap:4px;padding:18px 20px;text-decoration:none;color:var(--text);
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);
}
.reader-nav a:hover{border-color:var(--plum);color:var(--text);box-shadow:var(--shadow-md)}
.reader-nav .rn-dir{font-size:.76rem;letter-spacing:.08em;text-transform:uppercase;color:var(--text-faint);font-weight:700}
.reader-nav .rn-title{font-weight:700;letter-spacing:-.01em}
.reader-nav a.rn-next{text-align:right;align-items:flex-end}
body.reader-open{overflow:hidden}

/* ---------- to top ---------- */
.to-top{position:fixed;right:16px;bottom:16px;z-index:120;width:48px;height:48px;border-radius:50%;
  border:1px solid var(--line);background:var(--surface);box-shadow:var(--shadow-md);cursor:pointer;font-size:1.2rem}
.to-top:hover{border-color:var(--plum)}


/* ============================================================
   Bức tranh: núi xa, dòng sông, đồng cỏ và bồ công anh bay trong gió
   ============================================================ */
.hero{
  background:linear-gradient(180deg,var(--sky-1) 0%,var(--sky-2) 52%,var(--bg) 100%);
  padding-bottom:clamp(185px,30vw,340px);
}
.hero-glow{
  inset:0 0 auto;height:min(460px,74%);
  background:
    radial-gradient(circle 84px at 80% 19%,color-mix(in srgb,var(--sun-soft) 80%,transparent),transparent 72%),
    radial-gradient(44% 60% at 80% 16%,color-mix(in srgb,var(--sun-soft) 24%,transparent),transparent 72%),
    radial-gradient(42% 56% at 15% 24%,color-mix(in srgb,var(--river-soft) 22%,transparent),transparent 70%);
  filter:blur(5px);
}
.hero-inner{z-index:2;display:grid;gap:26px;align-items:center}
/* dòng chuyên mục chạy hết bề ngang, nằm trên cả chữ lẫn ảnh, để không bị vắt dòng */
.hero-inner > .eyebrow{margin-bottom:0}
/* trên điện thoại: đưa ảnh lên ngay sau dòng chuyên mục, trước tiêu đề,
   để không bị rớt xuống tận dưới nút bấm và thẻ số liệu */
@media (max-width:899px){
  .hero-figure{order:-1;width:min(220px,56vw);margin:2px auto 6px}
}
@media (min-width:900px){
  .hero{padding-bottom:clamp(260px,25vw,365px)}
  .hero-inner{grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);column-gap:48px;row-gap:14px}
  .hero-inner > .eyebrow{grid-column:1 / -1}
}

/* --- ảnh chân dung trong khối mở đầu --- */
.hero-figure{margin:0;justify-self:center;width:min(300px,70vw)}
@media (min-width:760px){.hero-figure{width:320px}}
@media (min-width:1000px){.hero-figure{width:380px}}
.hero-figure img{
  width:100%;height:auto;aspect-ratio:1;object-fit:cover;
  border-radius:clamp(28px,5vw,46px);border:6px solid var(--surface);
  box-shadow:0 0 0 2px color-mix(in srgb,var(--meadow) 38%,transparent),var(--shadow-md);
}

/* --- lớp phong cảnh --- */
.scene{position:absolute;left:0;right:0;bottom:-1px;z-index:0;pointer-events:none;
  height:clamp(175px,29vw,330px)}
.scene svg{display:block;width:100%;height:100%}

/* --- hạt bồ công anh bay --- */
.seeds{position:absolute;inset:0;z-index:1;overflow:hidden;pointer-events:none;
  --seed-img:url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 26'><g fill='none' stroke='black' stroke-width='1.3' stroke-linecap='round'><path d='M12 14.5V25'/><path d='M12 14.5 4.6 8.8'/><path d='M12 14.5 8.2 4.2'/><path d='M12 14.5 12 2.6'/><path d='M12 14.5 15.8 4.2'/><path d='M12 14.5 19.4 8.8'/><path d='M12 14.5 2.6 13.4'/><path d='M12 14.5 21.4 13.4'/></g><circle cx='12' cy='25' r='1.4' fill='black'/></svg>")}
.seeds span{
  position:absolute;left:0;width:var(--sz,20px);height:var(--sz,20px);opacity:0;
  background-color:var(--seed);
  -webkit-mask:var(--seed-img) center/contain no-repeat;
          mask:var(--seed-img) center/contain no-repeat;
  filter:drop-shadow(0 1px 2px var(--seed-shadow));
  animation:bay-trong-gio var(--dur,30s) linear var(--delay,0s) infinite;
}
@keyframes bay-trong-gio{
  0%  {opacity:0;  transform:translate3d(-10vw,0,0) rotate(-12deg)}
  7%  {opacity:.95}
  25% {transform:translate3d(20vw,-26px,0) rotate(52deg)}
  50% {transform:translate3d(50vw,18px,0) rotate(148deg)}
  75% {transform:translate3d(80vw,-20px,0) rotate(232deg)}
  93% {opacity:.9}
  100%{opacity:0;  transform:translate3d(118vw,10px,0) rotate(324deg)}
}
.seeds span:nth-child(1){top:13%;--sz:24px;--dur:28s;--delay:-2s}
.seeds span:nth-child(2){top:31%;--sz:16px;--dur:34s;--delay:-9s}
.seeds span:nth-child(3){top:53%;--sz:20px;--dur:24s;--delay:-16s}
.seeds span:nth-child(4){top:69%;--sz:13px;--dur:39s;--delay:-5s}
.seeds span:nth-child(5){top:7%; --sz:14px;--dur:31s;--delay:-22s}
.seeds span:nth-child(6){top:45%;--sz:26px;--dur:43s;--delay:-12s}
.seeds span:nth-child(7){top:79%;--sz:18px;--dur:27s;--delay:-19s}
.seeds span:nth-child(8){top:61%;--sz:12px;--dur:36s;--delay:-29s}
.seeds span:nth-child(9){top:22%;--sz:19px;--dur:46s;--delay:-34s}
@media (prefers-reduced-motion:reduce){.seeds{display:none}}

/* --- ảnh chân dung ở phần Giới thiệu --- */
.portrait{
  width:clamp(112px,27vw,152px);height:auto;aspect-ratio:1;object-fit:cover;
  border-radius:30px;border:4px solid var(--surface);
  box-shadow:0 0 0 2px color-mix(in srgb,var(--meadow) 42%,transparent),var(--shadow-md);
  margin:0 0 18px;
}

/* --- ô biểu trưng đầu trang dùng ảnh chân dung --- */
.brand-mark{
  overflow:hidden;padding:0;background:var(--surface-2);
  box-shadow:0 0 0 1.5px color-mix(in srgb,var(--meadow) 45%,transparent);
}
.brand-mark img{width:100%;height:100%;object-fit:cover;border-radius:inherit}

/* --- đường cỏ nhấp nhô viền chân trang --- */
.site-foot{position:relative;padding:0 0 36px}
.foot-hills{display:block;width:100%;height:clamp(44px,6vw,80px);color:var(--bg)}

@media print{
  .site-head,.to-top,.reader-bar,.reader-nav,.site-foot .copy{display:none!important}
  .reader{position:static;overflow:visible}
  body{background:#fff;color:#000}
}