/* ============================================================
   Thủy Thành Edu — shared styles
   Palette: ink navy + scholarly gold on warm paper
   ============================================================ */

:root{
  --paper:      #F6F2E9;
  --paper-deep: #EDE7D8;
  --ink:        #16324F;
  --ink-soft:   #24425F;
  --gold:       #C08A2D;
  --gold-soft:  #E4C67E;
  --green:      #2F5D50;
  --text:       #1C2733;
  --muted:      #5A6672;
  --line:       #D9D2C2;
  --white:      #FFFDF8;

  --wrap: 1140px;
  --r: 14px;
  --shadow: 0 18px 40px -24px rgba(22,50,79,.45);
}

*{ box-sizing:border-box; }

html{ scroll-behavior:smooth; }

body{
  margin:0;
  font-family:"Be Vietnam Pro", system-ui, sans-serif;
  color:var(--text);
  background:var(--paper);
  line-height:1.65;
  font-size:17px;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3{
  font-family:"Lora", Georgia, serif;
  color:var(--ink);
  line-height:1.2;
  margin:0 0 .4em;
  font-weight:600;
}

a{ color:var(--ink); text-decoration:none; }

img{ max-width:100%; display:block; }

.wrap{ max-width:var(--wrap); margin:0 auto; padding:0 24px; }

.eyebrow{
  font-size:.78rem;
  letter-spacing:.18em;
  text-transform:uppercase;
  font-weight:600;
  color:var(--gold);
  margin-bottom:.9rem;
}

/* ---------- Buttons ---------- */
.btn{
  display:inline-block;
  padding:.85rem 1.6rem;
  border-radius:999px;
  font-weight:600;
  font-size:.98rem;
  transition:transform .15s ease, box-shadow .15s ease, background .15s ease;
  cursor:pointer;
  border:1.5px solid transparent;
}
.btn-primary{ background:var(--gold); color:#2A1E05; box-shadow:0 10px 22px -12px rgba(192,138,45,.9); }
.btn-primary:hover{ transform:translateY(-2px); box-shadow:0 16px 28px -12px rgba(192,138,45,.95); }
.btn-ghost{ border-color:var(--ink); color:var(--ink); background:transparent; }
.btn-ghost:hover{ background:var(--ink); color:var(--white); }
.btn-light{ background:var(--white); color:var(--ink); }
.btn-light:hover{ transform:translateY(-2px); }

/* ---------- Header ---------- */
.site-header{
  position:sticky; top:0; z-index:50;
  background:rgba(246,242,233,.9);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.nav{ display:flex; align-items:center; justify-content:space-between; padding:14px 24px; max-width:var(--wrap); margin:0 auto; }
.brand{ display:flex; align-items:center; gap:12px; }
.brand-mark{
  width:44px; height:44px; border-radius:11px;
  background:var(--ink); color:var(--gold-soft);
  display:grid; place-items:center;
  font-family:"Lora",serif; font-weight:700; font-size:1.35rem;
  box-shadow:var(--shadow);
}
.brand-name{ font-family:"Lora",serif; font-weight:600; font-size:1.15rem; color:var(--ink); line-height:1.1; }
.brand-sub{ font-size:.72rem; letter-spacing:.12em; text-transform:uppercase; color:var(--muted); }
.nav-links{ display:flex; align-items:center; gap:8px; }
.nav-links a{ padding:.5rem .9rem; border-radius:8px; font-weight:500; font-size:.96rem; color:var(--ink-soft); }
.nav-links a:hover{ background:var(--paper-deep); }
.nav-links a.active{ color:var(--gold); font-weight:600; }
.nav-cta{ margin-left:8px; }

.menu-toggle{ display:none; background:none; border:0; font-size:1.6rem; color:var(--ink); cursor:pointer; }

/* ---------- Hero ---------- */
.hero{ position:relative; overflow:hidden; }
.hero-inner{ display:grid; grid-template-columns:1.05fr .95fr; gap:56px; align-items:center; padding:88px 0 76px; }
.hero h1{ font-size:clamp(2.3rem, 5vw, 3.5rem); letter-spacing:-.01em; }
.hero p.lead{ font-size:1.16rem; color:var(--ink-soft); max-width:46ch; margin:1.2rem 0 2rem; }
.hero-actions{ display:flex; gap:14px; flex-wrap:wrap; }

.hero-card{
  background:var(--ink);
  color:var(--white);
  border-radius:22px;
  padding:38px 34px;
  box-shadow:var(--shadow);
  position:relative;
}
.hero-card::before{
  content:""; position:absolute; inset:0;
  border-radius:22px;
  background:
    radial-gradient(120% 120% at 100% 0%, rgba(228,198,126,.22), transparent 55%);
  pointer-events:none;
}
.hero-card h3{ color:var(--gold-soft); font-size:1.15rem; }
.hero-stats{ display:grid; grid-template-columns:1fr 1fr; gap:22px; margin-top:22px; }
.hero-stat .num{ font-family:"Lora",serif; font-size:2.3rem; color:var(--white); font-weight:600; }
.hero-stat .lbl{ font-size:.85rem; color:#C9D4DF; line-height:1.35; }

/* ---------- Sections ---------- */
section{ padding:74px 0; }
.section-head{ max-width:60ch; margin-bottom:44px; }
.section-head.center{ margin-left:auto; margin-right:auto; text-align:center; }
.section-head h2{ font-size:clamp(1.8rem, 3.4vw, 2.5rem); }
.section-head p{ color:var(--muted); font-size:1.08rem; margin:.6rem 0 0; }

.alt{ background:var(--paper-deep); }

/* ---------- Service cards ---------- */
.cards{ display:grid; grid-template-columns:repeat(4,1fr); gap:22px; }
.card{
  background:var(--white);
  border:1px solid var(--line);
  border-radius:var(--r);
  padding:28px 24px;
  transition:transform .18s ease, box-shadow .18s ease, border-color .18s;
}
.card:hover{ transform:translateY(-4px); box-shadow:var(--shadow); border-color:var(--gold-soft); }
.card .ic{
  width:46px; height:46px; border-radius:12px;
  background:var(--paper-deep); color:var(--ink);
  display:grid; place-items:center; margin-bottom:16px;
  font-size:1.4rem;
}
.card h3{ font-size:1.18rem; margin-bottom:.35em; }
.card p{ color:var(--muted); font-size:.96rem; margin:0; }

/* ---------- Roadmap (signature) ---------- */
.roadmap{ display:grid; grid-template-columns:repeat(4,1fr); gap:0; margin-top:20px; }
.step{ position:relative; padding:28px 22px 28px 0; }
.step:not(:last-child)::after{
  content:""; position:absolute; top:44px; right:14px; left:52px; height:2px;
  background:linear-gradient(90deg, var(--gold), var(--gold-soft));
}
.step .n{
  width:52px; height:52px; border-radius:50%;
  background:var(--ink); color:var(--gold-soft);
  display:grid; place-items:center;
  font-family:"Lora",serif; font-size:1.35rem; font-weight:700;
  margin-bottom:16px; box-shadow:var(--shadow);
  position:relative; z-index:2;
}
.step h3{ font-size:1.12rem; }
.step p{ color:var(--muted); font-size:.94rem; margin:.3rem 0 0; }

/* ---------- Why / feature list ---------- */
.split{ display:grid; grid-template-columns:1fr 1fr; gap:56px; align-items:center; }
.feature-list{ list-style:none; padding:0; margin:1.2rem 0 0; }
.feature-list li{ display:flex; gap:14px; padding:14px 0; border-bottom:1px dashed var(--line); }
.feature-list li:last-child{ border-bottom:0; }
.feature-list .tick{ color:var(--gold); font-weight:700; flex:0 0 auto; }
.feature-list b{ color:var(--ink); }
.panel{
  background:var(--white); border:1px solid var(--line);
  border-radius:20px; padding:34px; box-shadow:var(--shadow);
}
.panel .quote{ font-family:"Lora",serif; font-size:1.3rem; color:var(--ink); line-height:1.45; }
.panel .cite{ margin-top:18px; color:var(--muted); font-size:.92rem; }

/* ---------- CTA band ---------- */
.cta-band{ background:var(--ink); color:var(--white); border-radius:24px; padding:56px 48px; text-align:center; box-shadow:var(--shadow); }
.cta-band h2{ color:var(--white); font-size:clamp(1.7rem,3.2vw,2.4rem); }
.cta-band p{ color:#C9D4DF; max-width:52ch; margin:.6rem auto 1.8rem; }

/* ---------- About specifics ---------- */
.values{ display:grid; grid-template-columns:repeat(3,1fr); gap:22px; }
.value{ background:var(--white); border:1px solid var(--line); border-radius:var(--r); padding:26px; }
.value .k{ font-family:"Lora",serif; color:var(--gold); font-size:1.5rem; font-weight:700; }
.value h3{ font-size:1.1rem; margin:.4rem 0 .3rem; }
.value p{ color:var(--muted); font-size:.95rem; margin:0; }

.info-grid{ display:grid; grid-template-columns:1.15fr .85fr; gap:40px; align-items:start; }
.info-table{ width:100%; border-collapse:collapse; }
.info-table th, .info-table td{ text-align:left; padding:16px 0; border-bottom:1px solid var(--line); vertical-align:top; }
.info-table th{ width:190px; color:var(--muted); font-weight:600; font-size:.9rem; letter-spacing:.02em; }
.info-table td{ color:var(--ink); }
.map-card{ background:var(--ink); color:var(--white); border-radius:20px; padding:30px; box-shadow:var(--shadow); }
.map-card h3{ color:var(--gold-soft); }
.map-card p{ color:#C9D4DF; margin:.2rem 0 1rem; }
.map-card a{ color:var(--gold-soft); }

/* ---------- Footer ---------- */
.site-footer{ background:#0F2740; color:#C9D4DF; padding:56px 0 28px; }
.foot-grid{ display:grid; grid-template-columns:1.4fr 1fr 1.3fr; gap:40px; }
.site-footer h4{ color:var(--white); font-family:"Lora",serif; font-size:1.05rem; margin:0 0 14px; }
.site-footer a{ color:#C9D4DF; }
.site-footer a:hover{ color:var(--gold-soft); }
.site-footer ul{ list-style:none; padding:0; margin:0; }
.site-footer li{ padding:5px 0; font-size:.95rem; }
.foot-brand .brand-name{ color:var(--white); }
.foot-brand p{ font-size:.93rem; line-height:1.6; }
.foot-bottom{ border-top:1px solid rgba(255,255,255,.12); margin-top:36px; padding-top:20px; font-size:.85rem; color:#8FA2B4; display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px; }

/* ---------- Responsive ---------- */
@media (max-width:900px){
  .hero-inner{ grid-template-columns:1fr; gap:36px; padding:56px 0 48px; }
  .cards{ grid-template-columns:1fr 1fr; }
  .roadmap{ grid-template-columns:1fr 1fr; }
  .step:not(:last-child)::after{ display:none; }
  .split, .info-grid{ grid-template-columns:1fr; gap:32px; }
  .values{ grid-template-columns:1fr; }
  .foot-grid{ grid-template-columns:1fr; gap:28px; }
  .nav-links{
    display:none; position:absolute; top:72px; left:0; right:0;
    flex-direction:column; align-items:stretch; gap:2px;
    background:var(--paper); border-bottom:1px solid var(--line);
    padding:12px 20px 20px;
  }
  .nav-links.open{ display:flex; }
  .nav-links .nav-cta{ margin:8px 0 0; text-align:center; }
  .menu-toggle{ display:block; }
}
@media (max-width:520px){
  .cards{ grid-template-columns:1fr; }
  .roadmap{ grid-template-columns:1fr; }
  .cta-band{ padding:40px 24px; }
}