/* ===== English With Tom — pastel xanh-tím ===== */
:root {
  --bg: #F7F6FD;
  --surface: #FFFFFF;
  --primary: #7B6EF6;
  --primary-2: #6FA8F5;
  --primary-soft: #ECE9FE;
  --blue-soft: #E6F0FE;
  --teal-soft: #E2F5F0;
  --amber-soft: #FCF1DD;
  --pink-soft: #FBEAF3;
  --text: #2E2B45;
  --text-muted: #6B6880;
  --text-faint: #9C99AE;
  --border: #E8E6F2;
  --success: #2E9E7B;
  --success-soft: #E2F5EE;
  --warning: #C98A1E;
  --warning-soft: #FBF0DA;
  --info: #4F7BD6;
  --info-soft: #E6EEFB;
  --gradient: linear-gradient(135deg, #6F58EE 0%, #4F8BF0 100%);
  --gradient-soft: linear-gradient(135deg, #BDA9F4 0%, #9DC0F6 100%);
  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 4px 20px rgba(123, 110, 246, 0.08);
  --shadow-hover: 0 8px 28px rgba(123, 110, 246, 0.16);
  --font: 'Be Vietnam Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font);
  background: linear-gradient(150deg, #ece8ff 0%, #e4effe 40%, #f0e8ff 100%) fixed;
  color: var(--text);
  line-height: 1.6;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* Chặn scroll ngang trên mọi thiết bị */
html { overflow-x: hidden; }

a { color: inherit; text-decoration: none; }
img, video, iframe { max-width: 100%; height: auto; }

/* Văn bản không tràn ra ngoài khung */
h1, h2, h3, h4 { word-break: break-word; overflow-wrap: break-word; }
p { overflow-wrap: break-word; }

.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }
.site-header .container { max-width: 1240px; }

/* ===== Header ===== */
.site-header {
  background: rgba(255,255,255,0.85);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 100;
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: nowrap; gap: 14px; height: 74px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; flex-shrink: 0; }
.brand > span { white-space: nowrap; line-height: 1.2; }
.brand-logo {
  width: 38px; height: 38px; border-radius: 11px;
  background: var(--gradient);
  display: grid; place-items: center; color: #fff; font-size: 20px;
  flex-shrink: 0;
}
/* Khi dùng ảnh logo thay thế chữ T */
img.brand-logo {
  background: none; border-radius: 0;
  object-fit: contain; width: 52px; height: 52px;
}
.footer-seal {
  width: 110px; height: 110px; object-fit: contain;
  display: block; margin-bottom: 14px;
}
.brand span { color: var(--text); }
.brand small { display:block; font-size: 11px; font-weight: 500; color: var(--text-faint); margin-top:-2px; white-space: nowrap;}

.nav-links { display: flex; align-items: center; gap: 1px; flex-wrap: nowrap; }
.nav-links a {
  padding: 8px 9px; border-radius: 9px; font-size: 13px; font-weight: 500;
  color: var(--text-muted); transition: .15s; white-space: nowrap;
}
.nav-links a:hover { background: var(--primary-soft); color: var(--primary); }
.nav-links a.active { background: var(--primary-soft); color: var(--primary); }

.nav-actions { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.btn {
  font-family: inherit; font-size: 14px; font-weight: 600; cursor: pointer;
  padding: 9px 18px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); transition: .15s; white-space: nowrap;
}
.btn:hover { border-color: var(--primary); color: var(--primary); }
.btn-primary { background: var(--gradient); color: #fff; border: none; box-shadow: var(--shadow); }
.btn-primary:hover { color: #fff; box-shadow: var(--shadow-hover); transform: translateY(-1px); }
.btn-ghost { background: transparent; border: none; }
.btn-sm { padding: 6px 13px; font-size: 13px; }
.btn-block { width: 100%; display:block; text-align:center; }

.menu-toggle { display:none; background:none; border:none; font-size:24px; cursor:pointer; color:var(--text);}

/* ===== Galaxy pattern (sao + tinh vân) ===== */
.galaxy { position: relative; overflow: hidden; }
.galaxy::before {
  content: ''; position: absolute; inset: 0; pointer-events: none; z-index: 0;
  background-image:
    radial-gradient(circle at 12% 22%, rgba(255,255,255,.45), transparent 42%),
    radial-gradient(circle at 88% 18%, rgba(167,139,250,.40), transparent 44%),
    radial-gradient(circle at 75% 88%, rgba(96,165,250,.38), transparent 46%),
    radial-gradient(2px 2px at 20px 30px, #fff, transparent),
    radial-gradient(1.5px 1.5px at 130px 80px, rgba(255,255,255,.9), transparent),
    radial-gradient(1px 1px at 220px 50px, rgba(255,255,255,.8), transparent),
    radial-gradient(2px 2px at 300px 140px, #fff, transparent),
    radial-gradient(1.5px 1.5px at 80px 170px, rgba(255,255,255,.85), transparent),
    radial-gradient(1px 1px at 360px 100px, rgba(255,255,255,.75), transparent),
    radial-gradient(1.5px 1.5px at 180px 210px, rgba(255,255,255,.8), transparent);
  background-repeat: repeat;
  background-size: 100% 100%, 100% 100%, 100% 100%, 400px 260px, 400px 260px, 400px 260px, 400px 260px, 400px 260px, 400px 260px, 400px 260px;
}
.galaxy > .container { position: relative; z-index: 1; }
.galaxy-card { position: relative; overflow: hidden; }
.galaxy-card::before {
  content: ''; position: absolute; inset: 0; pointer-events: none; z-index: 0;
  background-image:
    radial-gradient(circle at 15% 20%, rgba(255,255,255,.4), transparent 42%),
    radial-gradient(circle at 85% 85%, rgba(96,165,250,.38), transparent 46%),
    radial-gradient(2px 2px at 30px 30px, #fff, transparent),
    radial-gradient(1.5px 1.5px at 150px 80px, rgba(255,255,255,.9), transparent),
    radial-gradient(1px 1px at 260px 50px, rgba(255,255,255,.8), transparent),
    radial-gradient(2px 2px at 350px 120px, #fff, transparent);
  background-repeat: repeat;
  background-size: 100% 100%, 100% 100%, 430px 200px, 430px 200px, 430px 200px, 430px 200px;
}
.galaxy-card > * { position: relative; z-index: 1; }

/* ===== Hero ===== */
.hero { padding: 64px 0 48px; text-align: center; background: var(--gradient-soft); position: relative; overflow: hidden; }
.hero::before {
  content: ''; position: absolute; inset: 0; pointer-events: none; z-index: 0;
  background-image:
    radial-gradient(circle at 10% 20%, rgba(255,255,255,.5), transparent 40%),
    radial-gradient(circle at 90% 15%, rgba(150,110,250,.45), transparent 42%),
    radial-gradient(circle at 80% 90%, rgba(90,150,250,.42), transparent 45%),
    radial-gradient(2px 2px at 20px 30px, #fff, transparent),
    radial-gradient(1.5px 1.5px at 130px 80px, rgba(255,255,255,.9), transparent),
    radial-gradient(1px 1px at 220px 50px, rgba(255,255,255,.8), transparent),
    radial-gradient(2px 2px at 300px 140px, #fff, transparent),
    radial-gradient(1.5px 1.5px at 80px 180px, rgba(255,255,255,.85), transparent),
    radial-gradient(1px 1px at 360px 110px, rgba(255,255,255,.75), transparent),
    radial-gradient(1.5px 1.5px at 180px 220px, rgba(255,255,255,.8), transparent),
    radial-gradient(1px 1px at 420px 60px, rgba(255,255,255,.7), transparent);
  background-repeat: repeat;
  background-size: 100% 100%, 100% 100%, 100% 100%, 460px 280px, 460px 280px, 460px 280px, 460px 280px, 460px 280px, 460px 280px, 460px 280px, 460px 280px;
}
.hero > .container { position: relative; z-index: 1; }
.hero h1 { font-size: 40px; font-weight: 700; line-height: 1.2; margin-bottom: 16px; letter-spacing: -0.5px; }
.hero h1 .grad { background: var(--gradient); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.hero p { font-size: 17px; color: var(--text-muted); max-width: 560px; margin: 0 auto 28px; }
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.hero-badge {
  display:inline-flex; align-items:center; gap:7px; background:#fff; border:1px solid var(--border);
  padding:6px 14px; border-radius:999px; font-size:13px; color:var(--primary); font-weight:600; margin-bottom:20px;
}

/* ===== Section ===== */
.section { padding: 52px 0; }
.section-head { text-align: center; margin-bottom: 34px; }
.section-head h2 { font-size: 28px; font-weight: 700; margin-bottom: 8px; }
.section-head p { color: var(--text-muted); font-size: 15px; }

/* ===== Cards grid ===== */
.grid { display: grid; gap: 18px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-auto { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }

.course-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; transition: .18s; display: block;
}
.course-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: transparent; }
.course-ico {
  width: 50px; height: 50px; border-radius: 13px; display: grid; place-items: center;
  font-size: 25px; margin-bottom: 14px;
}
.ico-blue { background: var(--blue-soft); color: #4F7BD6; }
.ico-purple { background: var(--primary-soft); color: #7B6EF6; }
.ico-teal { background: var(--teal-soft); color: #2E9E7B; }
.ico-amber { background: var(--amber-soft); color: #C98A1E; }
.ico-pink { background: var(--pink-soft); color: #C2557F; }
.course-card h3 { font-size: 19px; font-weight: 700; margin-bottom: 6px; display:flex; align-items:center; gap:8px;}
.course-card p { color: var(--text-muted); font-size: 14px; margin-bottom: 14px; }
.course-meta { display: flex; gap: 14px; font-size: 12.5px; color: var(--text-faint); }
.course-meta span { display:flex; align-items:center; gap:5px;}
.tag {
  display:inline-block; font-size: 11px; font-weight: 700; padding: 3px 9px; border-radius: 999px;
  background: var(--primary-soft); color: var(--primary);
}
.tag-featured { background: var(--amber-soft); color: var(--warning); }

/* featured card border */
.course-card.featured { border: 2px solid var(--primary); }

/* ===== Page header ===== */
.page-hero { background: var(--gradient-soft); padding: 44px 0 36px; position: relative; overflow: hidden; }
.page-hero::before {
  content: ''; position: absolute; inset: 0; pointer-events: none; z-index: 0;
  background-image:
    radial-gradient(circle at 12% 25%, rgba(255,255,255,.45), transparent 42%),
    radial-gradient(circle at 88% 80%, rgba(90,150,250,.40), transparent 46%),
    radial-gradient(2px 2px at 30px 30px, #fff, transparent),
    radial-gradient(1.5px 1.5px at 140px 70px, rgba(255,255,255,.9), transparent),
    radial-gradient(1px 1px at 240px 40px, rgba(255,255,255,.8), transparent),
    radial-gradient(2px 2px at 330px 110px, #fff, transparent),
    radial-gradient(1.5px 1.5px at 90px 130px, rgba(255,255,255,.85), transparent);
  background-repeat: repeat;
  background-size: 100% 100%, 100% 100%, 440px 200px, 440px 200px, 440px 200px, 440px 200px, 440px 200px;
}
.page-hero > .container { position: relative; z-index: 1; }
.page-hero .crumb { font-size: 13px; color: var(--text-muted); margin-bottom: 10px; }
.page-hero h1 { font-size: 32px; font-weight: 700; }
.page-hero p { color: var(--text-muted); margin-top: 8px; max-width: 620px; }

/* ===== Dashboard ===== */
.profile-row { display:flex; align-items:center; gap:14px; margin-bottom: 26px; }
.avatar {
  width: 56px; height: 56px; border-radius: 50%; background: var(--gradient);
  display:grid; place-items:center; color:#fff; font-weight:700; font-size:20px;
}
.profile-row h2 { font-size: 20px; font-weight: 700; }
.profile-row .sub { color: var(--text-muted); font-size: 14px; }

.stat-grid { display:grid; grid-template-columns: repeat(3,1fr); gap: 16px; margin-bottom: 32px; }
.stat-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px; position: relative; overflow: hidden;
}
.stat-card .stat-ico { position:absolute; right:18px; top:18px; font-size:22px; opacity:.5;}
.stat-card .label { font-size: 13.5px; color: var(--text-muted); margin-bottom: 8px; }
.stat-card .value { font-size: 36px; font-weight: 700; line-height: 1; }
.stat-card .delta { font-size: 12.5px; color: var(--success); margin-top: 8px; }
.stat-card.accent .value { background: var(--gradient); -webkit-background-clip:text; background-clip:text; -webkit-text-fill-color:transparent;}

.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; margin-bottom: 22px;
}
.card-head { display:flex; align-items:center; justify-content:space-between; margin-bottom: 18px; }
.card-head h3 { font-size: 18px; font-weight: 700; }

/* task list */
.task { display:flex; align-items:center; justify-content:space-between; padding: 14px 0; border-bottom: 1px solid var(--border); }
.task:last-child { border-bottom: none; }
.task-left { display:flex; align-items:center; gap: 14px; }
.task-ico { width:42px; height:42px; border-radius: 11px; display:grid; place-items:center; font-size:19px; flex-shrink:0; }
.task-info h4 { font-size: 15px; font-weight: 600; }
.task-info .meta { font-size: 12.5px; color: var(--text-faint); margin-top:2px;}
.badge { font-size: 12px; font-weight: 600; padding: 5px 12px; border-radius: 999px; white-space:nowrap; }
.badge-todo { background: var(--warning-soft); color: var(--warning); }
.badge-grading { background: var(--info-soft); color: var(--info); }
.badge-done { background: var(--success-soft); color: var(--success); }

/* progress bar */
.progress { height: 8px; background: var(--primary-soft); border-radius: 999px; overflow:hidden; }
.progress > span { display:block; height:100%; background: var(--gradient); border-radius:999px; }

/* ===== Skill / test rows ===== */
.skill-grid { display:grid; grid-template-columns: repeat(2,1fr); gap: 16px; }
.skill-card { background:var(--surface); border:1px solid var(--border); border-radius:var(--radius); padding: 20px; }
.skill-card h3 { display:flex; align-items:center; gap:10px; font-size:17px; margin-bottom:6px;}
.skill-card p { color:var(--text-muted); font-size:13.5px; margin-bottom:14px;}
.test-row { display:flex; align-items:center; justify-content:space-between; padding:11px 0; border-top:1px solid var(--border); }
.test-row .name { font-size:14px; font-weight:500; }
.test-row .lvl { font-size:12px; color:var(--text-faint);}

/* ===== Forms ===== */
.form-wrap { max-width: 420px; margin: 0 auto; }
.auth-card { background:var(--surface); border:1px solid var(--border); border-radius: var(--radius); padding: 32px; box-shadow: var(--shadow); }
.field { margin-bottom: 16px; }
.field label { display:block; font-size:13.5px; font-weight:600; margin-bottom:7px; }
.field input, .field select, .field textarea {
  width:100%; font-family:inherit; font-size:14.5px; padding:11px 13px;
  border:1px solid var(--border); border-radius: var(--radius-sm); background:#fff; color:var(--text);
}
.field input:focus, .field select:focus, .field textarea:focus { outline:none; border-color:var(--primary); box-shadow:0 0 0 3px rgba(123,110,246,.12); }
.field textarea { resize:vertical; min-height: 90px; }
.divider { display:flex; align-items:center; gap:12px; margin:20px 0; color:var(--text-faint); font-size:13px; }
.divider::before, .divider::after { content:''; flex:1; height:1px; background:var(--border); }
.btn-google { display:flex; align-items:center; justify-content:center; gap:10px; }
.role-pick { display:flex; gap:10px; margin-bottom:18px; }
.role-pick label {
  flex:1; text-align:center; padding:11px; border:1px solid var(--border); border-radius:var(--radius-sm);
  font-size:14px; font-weight:600; cursor:pointer; color:var(--text-muted);
}
.role-pick input { display:none; }
.role-pick input:checked + label { border-color:var(--primary); background:var(--primary-soft); color:var(--primary); }

/* ===== Features ===== */
.feature { text-align:center; padding: 10px; }
.feature .fico { width:54px; height:54px; border-radius:15px; background:var(--primary-soft); color:var(--primary); display:grid; place-items:center; font-size:25px; margin:0 auto 14px; }
.feature h3 { font-size:17px; margin-bottom:7px; }
.feature p { color:var(--text-muted); font-size:14px; }

/* ===== Footer ===== */
.site-footer { background:#fff; border-top:1px solid var(--border); padding: 40px 0 28px; margin-top: 40px; }
.footer-grid { display:grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 26px; margin-bottom: 28px; }
.footer-grid h4 { font-size:14px; margin-bottom:12px; }
.footer-grid a { display:block; color:var(--text-muted); font-size:13.5px; padding:4px 0; }
.footer-grid a:hover { color:var(--primary); }
.footer-grid p { color:var(--text-muted); font-size:13.5px; }
.footer-bottom { border-top:1px solid var(--border); padding-top:18px; text-align:center; color:var(--text-faint); font-size:13px; }

/* ===== Practice page ===== */
.practice-bar { background:#fff; border:1px solid var(--border); border-radius:var(--radius); padding:14px 20px; display:flex; align-items:center; justify-content:space-between; margin-bottom:20px; }
.timer { display:flex; align-items:center; gap:8px; font-weight:700; color:var(--primary); }
.passage { background:#fff; border:1px solid var(--border); border-radius:var(--radius); padding:26px; font-size:14.5px; line-height:1.8; color:#403d57; }
.passage h3 { margin-bottom:12px; }
.passage p { margin-bottom:14px; }
.q-block { background:#fff; border:1px solid var(--border); border-radius:var(--radius); padding:22px; }
.q-item { padding:14px 0; border-bottom:1px solid var(--border); }
.q-item:last-child { border-bottom:none; }
.q-item .q-text { font-weight:600; font-size:14.5px; margin-bottom:10px; }
.opt { display:flex; align-items:center; gap:9px; padding:8px 11px; border:1px solid var(--border); border-radius:9px; margin-bottom:7px; cursor:pointer; font-size:14px; transition:.12s;}
.opt:hover { border-color:var(--primary); background:var(--primary-soft); }
.opt input { accent-color: var(--primary); }
.two-col { display:grid; grid-template-columns: 1fr 1fr; gap:20px; align-items:start; }

/* ===== Table (teacher) ===== */
.table { width:100%; border-collapse:collapse; }
.table th { text-align:left; font-size:12.5px; color:var(--text-faint); font-weight:600; padding:10px 12px; border-bottom:1px solid var(--border); }
.table td { padding:13px 12px; border-bottom:1px solid var(--border); font-size:14px; }
.table tr:last-child td { border-bottom:none; }

.note { background:var(--blue-soft); border:1px solid #cfe0fa; border-radius:var(--radius-sm); padding:13px 16px; font-size:13.5px; color:#3d5a8c; display:flex; gap:10px; }

/* ===== Responsive ===== */

/* ── 860px: tablet ── */
@media (max-width: 860px) {
  .grid-3, .skill-grid, .two-col { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }

  /* Nav dropdown */
  .nav-links {
    display: none;
    position: absolute; top: 74px; left: 0; right: 0;
    background: rgba(255,255,255,.97);
    backdrop-filter: blur(12px);
    flex-direction: column;
    padding: 8px 14px 14px;
    border-bottom: 1px solid var(--border);
    z-index: 98;
    box-shadow: 0 8px 24px rgba(0,0,0,.1);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 11px 12px; border-radius: 9px; font-size: 14px; }
  .menu-toggle { display: block; }

  /* Hero */
  .hero h1 { font-size: 30px; }
}

/* ── 640px: phone ── */
@media (max-width: 640px) {
  .container { padding: 0 14px; }

  /* Header — compact */
  .nav { height: 60px; gap: 6px; }
  .nav-links { top: 60px; }
  .brand { font-size: 14.5px; gap: 7px; }
  .brand small { display: none; }                 /* bỏ subtitle trên mobile */
  img.brand-logo { width: 34px; height: 34px; }
  .brand-logo:not(img) { width: 32px; height: 32px; font-size: 16px; border-radius: 8px; }
  .nav-actions { gap: 5px; }
  .nav-actions .btn-sm { padding: 6px 9px; font-size: 12px; }

  /* Hero */
  .hero { padding: 32px 0 26px; }
  .hero h1 { font-size: 22px; letter-spacing: 0; }
  .hero p { font-size: 14.5px; margin-bottom: 20px; }
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }
  .hero-actions a.btn, .hero-actions button.btn {
    display: block; width: 100%; text-align: center;
  }
  .hero-badge { font-size: 12px; padding: 5px 12px; margin-bottom: 14px; }

  /* Sections */
  .section { padding: 32px 0; }
  .section-head h2 { font-size: 22px; }
  .section-head p { font-size: 14px; }
  .page-hero { padding: 24px 0 18px; }
  .page-hero h1 { font-size: 22px; }
  .page-hero p { font-size: 14px; }
  .page-hero .crumb { font-size: 12px; }

  /* Cards */
  .card { padding: 16px; margin-bottom: 16px; }
  .card-head { flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
  .card-head h3 { font-size: 16px; }
  .auth-card { padding: 22px 16px; }

  /* Dashboard */
  .stat-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; margin-bottom: 18px; }
  .stat-card { padding: 16px 12px; }
  .stat-card .value { font-size: 28px; }
  .stat-card .label { font-size: 12.5px; }
  .stat-card .delta { font-size: 12px; }
  .profile-row { flex-wrap: wrap; gap: 10px; }
  .profile-row > a.btn, .profile-row > button.btn {
    margin-left: 0 !important; flex: 0 0 100%; text-align: center;
  }
  .avatar { width: 48px; height: 48px; font-size: 17px; }
  .profile-row h2 { font-size: 18px; }

  /* Task list */
  .task { flex-wrap: wrap; gap: 8px; }
  .task-left { flex: 1 1 100%; }

  /* Footer */
  .footer-grid { grid-template-columns: 1fr; gap: 16px; margin-bottom: 16px; }
  .footer-seal { width: 80px; height: 80px; }
  .site-footer { padding: 28px 0 20px; }

  /* Tables — allow horizontal scroll within card */
  .table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .table { min-width: 520px; }

  /* Test/exercise rows — wrap name & button */
  .test-row { flex-wrap: wrap; gap: 8px; padding: 10px 0; }
  .test-row .name { font-size: 13.5px; }

  /* Skill cards */
  .skill-card { padding: 16px; }
  .skill-card h3 { font-size: 16px; }

  /* Course cards */
  .course-card { padding: 18px; }
  .grid-auto { grid-template-columns: repeat(2, 1fr); }

  /* Practice bar */
  .practice-bar { flex-wrap: wrap; gap: 10px; padding: 12px 14px; }
}

/* ── 400px: rất nhỏ (iPhone SE, fold) ── */
@media (max-width: 400px) {
  .hero h1 { font-size: 19px; }
  .stat-grid { grid-template-columns: 1fr; }
  /* Ẩn nút Đăng nhập, chỉ giữ Đăng ký + hamburger */
  .nav-actions > a:not(.btn-primary):not(.menu-toggle) { display: none; }
}

/* ── Hero <br> ẩn trên mobile — text tự xuống dòng tự nhiên ── */
@media (max-width: 640px) {
  .hero h1 br { display: none; }
  .hero h1 .grad { display: inline; }
}

/* ── CTA section — giảm padding trên mobile ── */
@media (max-width: 640px) {
  .galaxy-card[style*="padding"] { padding: 28px 20px !important; }
  .galaxy-card h2 { font-size: 20px !important; }
}

/* =====================================================================
   Rich Text Editor (RichEditor) — js/editor.js
   ===================================================================== */
.re-wrap {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: #fff;
  transition: border-color .15s, box-shadow .15s;
  overflow: hidden;
}
.re-wrap:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-soft);
}

/* ── Toolbar ── */
.re-toolbar {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 5px 8px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  min-height: 36px;
}
.re-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px; height: 26px;
  border: none;
  background: transparent;
  border-radius: 5px;
  cursor: pointer;
  font-family: var(--font);
  font-size: 12.5px;
  color: var(--text-muted);
  transition: background .12s, color .12s;
  flex-shrink: 0;
  line-height: 1;
  padding: 0;
}
.re-btn:hover  { background: var(--primary-soft); color: var(--primary); }
.re-btn.active { background: var(--primary-soft); color: var(--primary); font-weight: 700; }
.re-btn svg    { display: block; }
.re-sep {
  width: 1px; height: 18px;
  background: var(--border);
  margin: 0 3px;
  flex-shrink: 0;
  align-self: center;
}

/* Color icons */
.re-ci-text {
  font-weight: 800; font-size: 13px;
  background: linear-gradient(135deg,#6F58EE,#e53e3e);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.re-ci-hl {
  font-weight: 800; font-size: 13px;
  background: #ffd43b;
  -webkit-text-fill-color: #555;
  padding: 0 2px; border-radius: 2px;
}

/* Color-picker label/input */
.re-color-wrap {
  cursor: pointer;
  position: relative;
  overflow: hidden;
}
.re-color-inp {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  opacity: 0;
  cursor: pointer;
  padding: 0;
  border: none;
}

/* ── Editable body ── */
.re-body {
  padding: 10px 13px;
  font-family: var(--font);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text);
  outline: none;
  word-break: break-word;
  overflow-wrap: break-word;
}
.re-body:empty::before {
  content: attr(data-placeholder);
  color: var(--text-faint);
  pointer-events: none;
  display: block;
}
.re-body p        { margin: 0 0 4px; }
.re-body ul, .re-body ol { padding-left: 22px; margin: 5px 0; }
.re-body li       { margin: 3px 0; }
.re-body b, .re-body strong { font-weight: 700; }
.re-body i, .re-body em    { font-style: italic; }
.re-body u  { text-decoration: underline; }
.re-body s  { text-decoration: line-through; }
.re-body h2, .re-body h3 { font-weight: 700; margin: 8px 0 4px; }

/* word-count bar that can sit under the editor */
.re-wc-bar {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 6px;
  font-size: 12.5px;
  color: var(--text-faint);
  margin-top: 4px;
}
.re-wc-bar .wc    { font-weight: 600; color: var(--text-muted); }
.re-wc-bar .wc.ok   { color: var(--success); }
.re-wc-bar .wc.over { color: var(--danger, #e53e3e); }