/* Khung site (danh sách bài, đăng nhập). Trang bài học KHÔNG dùng file này —
   CSS riêng của bài sở hữu cả trang đó. Bảng màu lấy theo bài cho đỡ lệch. */
:root {
  --paper: #FBFDFC; --ink: #14322C; --walnut: #0F5E50; --taupe: #4F6B64;
  --accent: #E8643C; --card: #E3F3EE; --card2: #EEF7F3; --line: #BBD6CD; --dark: #0B4034;
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: 'Inter', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, system-ui, sans-serif;
}
.sitebar {
  background: var(--dark); color: #fff; display: flex; align-items: center;
  gap: 14px; padding: 10px 18px; flex-wrap: wrap;
}
.sitebar .logo { color: #fff; font-weight: 700; text-decoration: none; margin-right: auto; }
.sitebar .who { color: #9FD8C9; font-size: 14px; }
.sitebar a { color: #DDEDE7; font-size: 14px; }
.sitebar form { margin: 0; }
.sitebar button {
  background: #12483C; color: #EAF4F0; border: 1px solid #2C6C5C;
  border-radius: 14px; padding: 4px 12px; font-size: 13px; cursor: pointer;
}
main { max-width: 900px; margin: 0 auto; padding: 24px 18px 60px; }
h1 { font-size: 28px; color: var(--walnut); margin: 0 0 22px; }
.course { margin-bottom: 34px; }
.course h2 { font-size: 21px; color: var(--walnut); border-left: 6px solid var(--accent); padding-left: 12px; margin: 0 0 6px; }
.progress { color: var(--taupe); font-size: 14px; margin: 0 0 12px; }
.empty { color: var(--taupe); font-style: italic; }
ul.lessons { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
ul.lessons a {
  display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap;
  background: var(--card2); border: 1px solid var(--line); border-radius: 10px;
  padding: 11px 15px; text-decoration: none; color: var(--ink);
}
ul.lessons a:hover { background: var(--card); border-color: var(--accent); }
ul.lessons .num { font-size: 13px; color: var(--taupe); min-width: 58px; }
ul.lessons .zh {
  font-size: 20px; font-weight: 600;
  font-family: "ARPLUKaiTW", "標楷體", "DFKai-SB", BiauKai, KaiTi, "Noto Serif TC", serif;
}
ul.lessons .vi { font-size: 14px; color: var(--taupe); }

.loginbox { max-width: 360px; }
.loginbox label { display: block; font-size: 14px; color: var(--taupe); margin: 12px 0 4px; }
.loginbox input {
  width: 100%; padding: 9px 11px; border: 1px solid var(--line);
  border-radius: 8px; font-size: 15px; background: #fff;
}
.loginbox button {
  margin-top: 18px; background: var(--accent); color: #fff; border: none;
  border-radius: 8px; padding: 10px 20px; font-size: 15px; cursor: pointer;
}
.errors { color: #C0392B; font-size: 14px; margin: 10px 0 0; }

/* ---------- Trang nền ---------- */
/* Cố tình không dùng ảnh chụp: bố cục phải hoàn chỉnh khi chưa có ảnh thật của
   trường. Thay khối .hero-art bằng <img> khi có ảnh. */

main { max-width: 1040px; }

.hero {
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  gap: 36px;
  align-items: center;
  padding: 18px 0 46px;
}
.hero .eyebrow {
  margin: 0 0 10px; font-size: 13px; letter-spacing: 2.5px;
  color: var(--accent); font-weight: 700;
}
.hero h1 {
  font-size: clamp(34px, 5vw, 52px); line-height: 1.08; margin: 0 0 16px;
  color: var(--dark);
}
.hero .lede { font-size: 17px; line-height: 1.7; color: var(--taupe); margin: 0 0 26px; max-width: 34em; }

.cta { display: flex; gap: 10px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 11px 22px; border-radius: 10px;
  border: 1px solid var(--line); color: var(--walnut);
  text-decoration: none; font-size: 15px; font-weight: 600;
}
.btn:hover { background: var(--card2); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { filter: brightness(1.07); }

.hero-art {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 6px; padding: 40px 20px; border-radius: 16px;
  background: var(--dark); color: #fff; min-height: 230px;
}
.hero-art .art-hz {
  font-family: "ARPLUKaiTW", "標楷體", "DFKai-SB", BiauKai, KaiTi, "Noto Serif TC", serif;
  font-size: clamp(58px, 9vw, 92px); line-height: 1;
}
.hero-art .art-py { font-size: 16px; color: #9FD8C9; letter-spacing: 2px; }
/* Ảnh (SVG minh hoạ mặc định, hoặc ảnh thật khi có file) */
img.hero-art {
  padding: 0; width: 100%; height: auto; display: block;
  object-fit: cover; background: var(--dark);
}
.hero-art-text { /* bản dự phòng bằng chữ, dùng khi không có ảnh nào */ }

.procard .proimg {
  width: 100%; height: 132px; object-fit: cover;
  border-radius: 10px; margin-bottom: 12px; display: block;
}

.loginnote { font-size: 14px; color: var(--taupe); margin-top: 22px; max-width: 34em; }
.loginnote a { color: var(--walnut); }

.programs, .features { padding: 8px 0 44px; }
.programs h2, .features h2 {
  font-size: 24px; color: var(--walnut);
  border-left: 6px solid var(--accent); padding-left: 12px; margin: 0 0 20px;
}

.progrid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; }
.procard {
  background: var(--card2); border: 1px solid var(--line);
  border-radius: 14px; padding: 20px;
}
.procard .promark {
  font-family: "ARPLUKaiTW", "標楷體", "DFKai-SB", BiauKai, KaiTi, "Noto Serif TC", serif;
  font-size: 46px; line-height: 1; color: var(--accent); margin-bottom: 10px;
}
.procard h3 { font-size: 18px; margin: 0 0 4px; color: var(--dark); }
.procard .proexam {
  display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: 1px;
  background: var(--walnut); color: #fff; padding: 2px 9px; border-radius: 10px; margin: 0 0 10px;
}
.procard .problurb { font-size: 14.5px; line-height: 1.65; color: var(--taupe); margin: 0 0 12px; }
.procard .prostat { font-size: 13px; color: var(--walnut); margin: 0; }
.procard .prostat.soon { color: var(--taupe); font-style: italic; }

.featlist { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.featlist li {
  font-size: 15px; line-height: 1.65; color: var(--taupe);
  padding-left: 26px; position: relative;
}
.featlist li::before {
  content: "·"; position: absolute; left: 8px; top: -2px;
  color: var(--accent); font-size: 26px; font-weight: 700;
}
.featlist b { color: var(--ink); }

.sitefoot {
  border-top: 1px solid var(--line); margin-top: 20px;
  padding: 18px; display: flex; gap: 14px; justify-content: space-between;
  flex-wrap: wrap; font-size: 13px; color: var(--taupe);
}

@media (max-width: 760px) {
  .hero { grid-template-columns: 1fr; gap: 22px; padding-bottom: 30px; }
  .hero-art { min-height: 150px; padding: 26px; }
}

/* ---------- Liên hệ ---------- */
.contact { padding: 8px 0 46px; }
.contactbox {
  background: var(--dark); color: #fff;
  border-radius: 14px; padding: 24px 26px;
}
.contactbox .cname {
  margin: 0 0 16px; font-size: 20px; font-weight: 700;
}
.clist { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.clist li { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.clabel {
  font-size: 12px; letter-spacing: 1.5px; text-transform: uppercase;
  color: #8FD3C2; min-width: 148px;
}
.cval { color: #fff; font-size: 18px; font-weight: 600; text-decoration: none; }
.cval:hover { text-decoration: underline; }
.cbtn {
  background: var(--accent); color: #fff; text-decoration: none;
  font-size: 13.5px; font-weight: 700; padding: 6px 14px; border-radius: 20px;
}
.cbtn:hover { filter: brightness(1.08); }
.cnote { margin: 18px 0 0; font-size: 14px; color: #9FD8C9; }

.sitefoot a { color: var(--walnut); text-decoration: none; }
.sitefoot a:hover { text-decoration: underline; }

@media (max-width: 560px) {
  .clabel { min-width: 100%; }
  .contactbox { padding: 20px; }
}