@import url('https://fonts.googleapis.com/css2?family=Lora:ital,wght@0,400;0,500;0,600;0,700;1,400;1,600;1,700&family=Be+Vietnam+Pro:wght@400;500;600;700;800&display=swap');
@import url('https://cdn.jsdelivr.net/npm/katex@0.16.8/dist/katex.min.css');

/* ============================================
   VINHMATH — LINH KIỆN GIAO DIỆN DÙNG CHUNG
   (nút, ô nhập, thẻ, nhãn, bảng…)
   Mọi trang đều nhập file này + tokens.css
   ============================================ */

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body {
  background: var(--bg);
  background-image: var(--bg-gradient);
  background-attachment: fixed;
  background-size: cover;
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  transition: background 0.3s, color 0.3s;
  -webkit-font-smoothing: antialiased;
  position: relative;
  overflow-x: hidden;
  min-height: 100vh;
}
body::before, body::after {
  content: "";
  position: fixed;
  width: 45vw;
  height: 45vw;
  border-radius: 50%;
  filter: blur(120px);
  z-index: -2;
  opacity: 0.25;
  pointer-events: none;
  transition: opacity 0.5s ease, background 0.5s ease;
}
@keyframes floatBlob1 {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(6vw, 4vh) scale(1.1); }
  100% { transform: translate(0, 0) scale(1); }
}
@keyframes floatBlob2 {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-4vw, -6vh) scale(0.9); }
  100% { transform: translate(0, 0) scale(1); }
}
body::before {
  top: -10vw;
  right: -10vw;
  background: radial-gradient(circle, rgba(30, 78, 140, 0.25) 0%, rgba(30, 78, 140, 0) 70%);
  animation: floatBlob1 25s ease-in-out infinite;
}
body::after {
  bottom: -10vw;
  left: -10vw;
  background: radial-gradient(circle, rgba(194, 125, 0, 0.15) 0%, rgba(194, 125, 0, 0) 70%);
  animation: floatBlob2 20s ease-in-out infinite;
}

[data-theme="dark"] body::before {
  background: radial-gradient(circle, rgba(30, 78, 140, 0.2) 0%, rgba(30, 78, 140, 0) 70%);
  opacity: 0.45;
}
[data-theme="dark"] body::after {
  background: radial-gradient(circle, rgba(194, 125, 0, 0.1), rgba(194, 125, 0, 0) 70%);
  opacity: 0.35;
}

h1{font-family:var(--font-title);font-size:2.25rem;font-weight:700;letter-spacing:0.04em;line-height:1.25;color:var(--ink-2);text-transform:uppercase}
h2{font-family:var(--font-title);font-size:1.625rem;font-weight:700;letter-spacing:0.03em;color:var(--ink-2);text-transform:uppercase}
h3{font-family:var(--font-serif);font-size:1.25rem;font-weight:600;color:var(--ink-2)}
p{color:var(--ink)}
a{color:inherit}
img{max-width:100%;display:block}

/* ---- Thanh đầu trang (Kính mờ trong suốt thích ứng) ---- */
.topbar{
  position:sticky;top:0;z-index:990;
  background:var(--topbar-bg);
  backdrop-filter:blur(20px);
  -webkit-backdrop-filter:blur(20px);
  border-bottom:var(--topbar-border);
  box-shadow:var(--shadow);
  transition: background 0.3s, border-color 0.3s;
}
.topbar .nav{max-width:1080px;margin:0 auto;padding:14px 24px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.logo{display:flex;align-items:center;gap:10px;font-family:var(--font-title);font-weight:700;font-size:1.15rem;letter-spacing:0.05em;text-decoration:none;color:var(--topbar-text);text-transform:uppercase}
.logo .dot{
  width:30px;height:30px;border-radius:6px;background:var(--accent);
  color:#ffffff;display:grid;place-items:center;font-size:.95rem;font-weight:700;flex:none;
}
[data-theme="dark"] .logo .dot{
  color:#09152e;
}
.logo img{
  width:30px;height:30px;border-radius:6px;object-fit:cover;flex:none;
}
.logo small{font-family:var(--font-sans);font-weight:500;color:var(--topbar-text-muted);font-size:.78rem;margin-left:2px;text-transform:none;letter-spacing:0}
.role-badge{font-family:var(--font-sans);font-size:.72rem;font-weight:700;padding:3px 8px;border-radius:6px;margin-left:8px;text-transform:uppercase;letter-spacing:.5px;display:inline-block;line-height:1.2;vertical-align:middle}
.role-badge.badge-admin{background:var(--accent-soft);color:var(--accent);border:1px solid rgba(194, 125, 0, 0.25)}
.role-badge.badge-teacher{background:var(--ok-soft);color:var(--ok);border:1px solid rgba(26, 117, 86, 0.25)}
.role-badge.badge-assistant{background:var(--warn-soft);color:var(--warn);border:1px solid rgba(184, 125, 20, 0.25)}
.role-badge.badge-student{background:var(--topbar-btn-bg);color:var(--topbar-link);border:1px solid var(--topbar-btn-border)}
.role-badge.badge-parent{background:var(--topbar-btn-bg);color:var(--topbar-link);border:1px solid var(--topbar-btn-border)}

.navlinks{display:flex;gap:4px;align-items:center}
.navlinks a{
  text-decoration:none;font-size:.92rem;font-weight:600;color:var(--topbar-link);
  padding:7px 14px;border-radius:var(--r-sm);transition:all .15s;
}
.navlinks a:hover{background:var(--topbar-btn-bg);color:var(--topbar-link-hover)}
.navlinks a.active {
  color: var(--topbar-link-active);
  font-weight: 700;
  text-shadow: 0 0 8px rgba(194, 125, 0, 0.2);
  position: relative;
}
.navlinks a.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 15%;
  width: 70%;
  height: 3px;
  background: var(--accent-gradient);
  border-radius: 99px;
  box-shadow: 0 0 8px var(--accent);
}

/* Đồng bộ toàn bộ nút bấm trong Topbar để không bị che khuất và hiển thị đẹp mắt */
.topbar .btn-secondary {
  background: var(--topbar-btn-bg) !important;
  border: var(--topbar-btn-border) !important;
  color: var(--topbar-btn-text) !important;
  box-shadow: none !important;
  transition: all 0.2s ease !important;
  font-family: var(--font-sans) !important;
  text-transform: uppercase !important;
  font-weight: 700 !important;
  letter-spacing: 0.05em !important;
  font-size: 0.8rem !important;
  padding: 0 16px !important;
  height: 38px !important;
  display: inline-flex !important;
  align-items: center;
  justify-content: center;
  border-radius: var(--r-sm) !important;
  white-space: nowrap !important;
}
.topbar .btn-secondary:hover {
  background: var(--topbar-btn-hover-bg) !important;
  color: var(--topbar-link-hover) !important;
  border-color: var(--topbar-link-hover) !important;
}
.topbar #themeBtn {
  background: var(--topbar-btn-bg) !important;
  border: var(--topbar-btn-border) !important;
  color: var(--topbar-btn-text) !important;
  box-shadow: none !important;
  transition: all 0.2s ease !important;
  width: 38px !important;
  height: 38px !important;
  padding: 0 !important;
  display: inline-flex !important;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem !important;
  border-radius: var(--r-sm) !important;
  cursor: pointer;
}
.topbar #themeBtn:hover {
  background: var(--topbar-btn-hover-bg) !important;
  color: var(--topbar-link-hover) !important;
  border-color: var(--topbar-link-hover) !important;
}

/* ---- Dropdown menu quản trị ---- */
.nav-dropdown {
  position: relative;
  display: inline-block;
}
.nav-dropdown-btn {
  text-decoration: none;
  font-size: .92rem;
  font-weight: 600;
  color: var(--topbar-link);
  padding: 7px 14px;
  border-radius: var(--r-sm);
  background: transparent;
  border: none;
  cursor: pointer;
  font-family: inherit;
  transition: all .15s;
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-dropdown-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--topbar-link-hover);
}
.nav-dropdown-btn.active {
  color: var(--topbar-link-active);
  font-weight: 700;
  text-shadow: 0 0 8px rgba(194, 125, 0, 0.4);
  position: relative;
}
.nav-dropdown-btn.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 15%;
  width: 70%;
  height: 3px;
  background: var(--accent-gradient);
  border-radius: 99px;
  box-shadow: 0 0 8px var(--accent);
}
.nav-dropdown-content {
  display: none;
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--surface-solid);
  border: 1px solid var(--line-2);
  box-shadow: var(--shadow);
  border-radius: var(--r-sm);
  min-width: 180px;
  z-index: 500;
  padding: 6px 0;
  margin-top: 6px;
}
.nav-dropdown-content a {
  display: block;
  padding: 8px 16px;
  font-size: 0.88rem !important;
  font-weight: 500;
  color: var(--ink-2);
  text-decoration: none;
  border-radius: 0 !important;
}
.nav-dropdown-content a:hover {
  background: var(--surface-2);
  color: var(--ink-2);
}
.nav-dropdown-content a.active {
  color: var(--accent) !important;
  font-weight: 700;
  background: var(--accent-soft);
}
.nav-dropdown-content a.active::after {
  display: none !important;
}
.nav-dropdown.open .nav-dropdown-content {
  display: block;
}

/* ---- Chuông thông báo ---- */
.bell-wrap{position:relative;flex:none}
.nav-bell {
  position: relative;
  border: var(--topbar-btn-border);
  background: var(--topbar-btn-bg);
  width: 38px;
  height: 38px;
  border-radius: var(--r-sm);
  cursor: pointer;
  display: grid;
  place-items: center;
  color: var(--topbar-btn-text);
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}
.nav-bell:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--topbar-btn-hover-bg);
  box-shadow: 0 0 12px var(--accent-soft);
}
.bell-svg {
  width: 20px;
  height: 20px;
  stroke: currentColor !important;
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: transform 0.2s ease;
}
.bell-svg path {
  fill: none;
  stroke: currentColor !important;
}
.bell-svg path:first-child {
  fill: var(--accent-soft);
}
.bell-svg path:last-child {
  fill: currentColor !important;
}
.nav-bell:hover .bell-svg {
  transform: rotate(15deg);
}
.bell-badge{position:absolute;top:-6px;right:-6px;background:var(--err);color:#fff;font-size:.66rem;font-weight:700;min-width:17px;height:17px;border-radius:99px;display:grid;place-items:center;padding:0 4px;border:2px solid var(--topbar-bg)}
.bell-panel{position:absolute;right:0;top:calc(100% + 8px);width:330px;max-width:88vw;background:var(--surface-solid);border:1px solid var(--line-2);border-radius:var(--r-md);box-shadow:var(--shadow);z-index:300;overflow:hidden}
.bell-head{display:flex;justify-content:space-between;align-items:center;padding:10px 14px;border-bottom:1px solid var(--line)}
.bell-readall{border:none;background:none;color:var(--accent);cursor:pointer;font-size:.82rem;font-family:inherit}
.bell-list{max-height:340px;overflow-y:auto}
.bell-item{padding:10px 14px;border-bottom:1px solid var(--line);cursor:pointer;display:flex;flex-direction:column;gap:2px}
.bell-item:hover{background:var(--surface-2)}
.bell-item b{font-size:.85rem;line-height:1.4;color:var(--ink-2)}
.bell-item span{font-size:.8rem;color:var(--ink);line-height:1.45}
.bell-item small{font-size:.72rem;color:var(--ink-3)}
.bell-item.unread{background:var(--accent-soft)}

.nav-burger{display:none;border:var(--topbar-btn-border);background:var(--topbar-btn-bg);color:var(--topbar-btn-text);font-size:1.1rem;width:38px;height:38px;border-radius:var(--r-sm);cursor:pointer;flex:none;transition:all 0.2s ease}
.nav-burger:hover {
  background: var(--topbar-btn-hover-bg);
  color: var(--topbar-link-hover);
  border-color: var(--topbar-link-hover);
}
@media(max-width:960px){
  .topbar .nav{position:relative;flex-wrap:wrap}
  .nav-burger{display:grid;place-items:center}
  .navlinks{display:none;position:absolute;top:100%;left:0;right:0;background:var(--bg);border:1px solid var(--line);border-top:none;box-shadow:0 14px 34px rgba(0,0,0,.35);flex-direction:column;align-items:stretch;padding:8px 16px 14px;gap:2px;z-index:99;max-height:calc(100vh - 60px);overflow-y:auto}
  .navlinks.open{display:flex}
  .navlinks a{padding:12px 14px;font-size:1rem}
  .nav-dropdown {
    width: 100%;
  }
  .nav-dropdown-btn {
    width: 100%;
    justify-content: space-between;
    padding: 12px 14px;
    font-size: 1rem;
  }
  .nav-dropdown-btn.active::after {
    display: none !important;
  }
  .nav-dropdown-content {
    display: none;
    position: static;
    transform: none;
    width: 100%;
    box-shadow: none;
    border: none;
    background: transparent;
    padding: 0 0 0 16px;
    margin-top: 0;
  }
}

/* ---- Nút ---- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-family:inherit;font-size:.94rem;font-weight:600;
  padding:10px 20px;border-radius:var(--r-sm);border:1px solid transparent;
  cursor:pointer;transition:all 0.25s cubic-bezier(0.4, 0, 0.2, 1);text-decoration:none;
  box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}
.btn-primary{
  background: var(--accent-gradient);
  color: #fff;
  border: 1px solid var(--accent);
  position: relative;
  overflow: hidden;
}
.btn-primary::before {
  content: "";
  position: absolute;
  top: 0;
  left: -150%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.25), transparent);
  transition: left 0.6s ease;
}
.btn-primary:hover::before {
  left: 150%;
}
.btn-primary:hover{
  transform: translateY(-2px);
  box-shadow: 0 8px 20px var(--accent-soft), 0 0 12px var(--accent-soft);
  filter: brightness(1.1);
}
.btn-secondary{
  background: var(--surface);
  color: var(--ink);
  border: var(--glass-border);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
}
.btn-secondary:hover{
  background: var(--surface-2);
  border-color: var(--line-2);
  transform: translateY(-1px);
}
.btn-ghost{background:transparent;color:var(--ink-2)}
.btn-ghost:hover{background:var(--surface-2);color:var(--ink)}
.btn-sm{padding:6px 14px;font-size:.85rem}
.btn-lg{padding:13px 26px;font-size:1rem}

/* ---- Ô nhập ---- */
.field{margin-bottom:16px}
.field label{display:block;font-size:.875rem;font-weight:500;margin-bottom:6px}
.input{
  width:100%;font-family:inherit;font-size:.95rem;color:var(--ink);
  background:var(--surface);border:1px solid var(--line-2);border-radius:var(--r-sm);
  padding:10px 14px;transition:border-color .15s,box-shadow .15s;
}
.input::placeholder{color:var(--ink-3)}
.input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}

/* ---- Thẻ ---- */
.card{
  background: var(--card-glow, transparent), var(--surface);
  border:var(--glass-border);
  backdrop-filter:var(--glass-blur);
  -webkit-backdrop-filter:var(--glass-blur);
  border-radius:var(--r-md);
  padding:24px;
  box-shadow:var(--shadow);
  position:relative;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1),
              background-color 0.3s, border-color 0.3s, box-shadow 0.3s;
}
/* Bỏ thanh vàng 4px cạnh trên — thay bằng lớp đổ màu gradient (--card-glow) */
.card::before { display: none !important; }
/* .card::after {
  content: "";
  position: absolute;
  top: 8px; left: 8px; right: 8px; bottom: 8px;
  border: 1px dashed rgba(194, 125, 0, 0.15);
  border-radius: calc(var(--r-md) - 6px);
  pointer-events: none;
  transition: border-color 0.3s;
}
.card:hover::after {
  border-color: rgba(194, 125, 0, 0.4);
} */
.card:hover {
  background: var(--card-glow, transparent), var(--surface-2);
  transform: translateY(-4px);
  box-shadow: 0 16px 36px 0 rgba(31, 58, 96, 0.12), 0 0 15px var(--accent-soft);
  border-color: var(--line-2);
}
[data-theme="dark"] .card:hover {
  box-shadow: 0 16px 48px 0 rgba(0, 0, 0, 0.55), 0 0 20px var(--accent-soft);
  border-color: rgba(194, 125, 0, 0.35);
}

/* ---- LaTeX-inspired document boxes ---- */
.box-vd {
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-left: 5px solid var(--ink-2);
  border-radius: var(--r-sm);
  padding: 16px;
  margin-bottom: 20px;
  color: var(--ink);
  position: relative;
  box-shadow: var(--shadow);
}
.box-vd .box-title {
  font-family: var(--font-title);
  color: var(--ink-2);
  font-weight: 700;
  margin-bottom: 8px;
  text-transform: uppercase;
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: 6px;
}
.box-bt {
  background: #fffbeb;
  border: 1px solid rgba(194, 125, 0, 0.2);
  border-left: 5px solid #c27d00;
  border-radius: var(--r-sm);
  padding: 16px;
  margin-bottom: 20px;
  color: #1e293b;
  position: relative;
  box-shadow: 0 2px 8px rgba(194, 125, 0, 0.03);
}
.box-bt .box-title {
  font-family: var(--font-title);
  color: #c27d00;
  font-weight: 700;
  margin-bottom: 8px;
  text-transform: uppercase;
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ---- Classic Western decorative line divider ---- */
.classic-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin: 32px 0;
}
.classic-divider::before, .classic-divider::after {
  content: "";
  height: 1px;
  flex: 1;
  background: linear-gradient(to right, transparent, var(--line-2), transparent);
}
.classic-divider::after {
  background: linear-gradient(to left, transparent, var(--line-2), transparent);
}
.classic-divider-symbol {
  font-family: var(--font-title);
  color: var(--accent);
  font-size: 1.1rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.grid{display:grid;gap:16px}
.grid-2{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.grid-3{grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}
.grid-4{grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}

/* ---- Nhãn ---- */
.badge{display:inline-block;font-size:.78rem;font-weight:600;padding:3px 10px;border-radius:99px}
.badge-accent{background:var(--accent-soft);color:var(--accent)}
.badge-ok{background:var(--ok-soft);color:var(--ok)}
.badge-warn{background:var(--warn-soft);color:var(--warn)}
.badge-err{background:var(--err-soft);color:var(--err)}
.badge-mute{background:var(--surface-2);color:var(--ink-2)}

/* ---- Bảng ---- */
table{width:100%;border-collapse:collapse;font-size:.92rem}
th{text-align:left;font-size:.78rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-3);padding:10px 14px;border-bottom:1px solid var(--line-2)}
td{padding:12px 14px;border-bottom:1px solid var(--line)}
tr:last-child td{border-bottom:none}
.num{font-variant-numeric:tabular-nums}

/* ---- Thanh tiến độ ---- */
.bar{height:6px;border-radius:99px;background:var(--surface-2);overflow:hidden}
.bar i{display:block;height:100%;border-radius:99px;background:var(--accent)}

/* ---- Thống kê ---- */
.stat b{font-size:1.7rem;font-weight:700;letter-spacing:-.02em;display:block;line-height:1.2}
.stat span{font-size:.85rem;color:var(--ink-2)}

/* ---- Nhãn mục ---- */
.sec-label{font-size:.8rem;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);margin-bottom:8px}

/* ---- Hiệu ứng vinh danh Sáng lập/Owner ---- */
@keyframes shimmer {
  0% { background-position: -200% center; }
  100% { background-position: 200% center; }
}
.name-owner {
  font-weight: 800 !important;
  color: #e74c3c !important;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.badge-owner {
  background: linear-gradient(120deg, #FFD700 0%, #FF8C00 50%, #FFD700 100%) !important;
  background-size: 200% auto !important;
  color: #fff !important;
  padding: 1px 5px !important;
  border-radius: 4px !important;
  font-size: 0.68rem !important;
  font-weight: 800 !important;
  text-shadow: 0 1px 1px rgba(0,0,0,0.2) !important;
  box-shadow: 0 1px 3px rgba(230,126,34,0.4) !important;
  border: 1px solid rgba(255,255,255,0.2) !important;
  animation: shimmer 3s linear infinite !important;
  display: inline-block;
  vertical-align: middle;
}

/* ---- Hiệu ứng cuộn trồi lên (Scroll Reveal) ---- */
.reveal {
  opacity: 0;
  transform: translateY(35px);
  transition: opacity 0.9s cubic-bezier(0.16, 1, 0.3, 1), transform 0.9s cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* ---- Phần Hành trình Thầy Vinh (Giao diện Carousel cao cấp) ---- */
.journey-section {
  padding: 56px 24px;
  max-width: 1120px;
  margin: 0 auto;
  overflow: hidden;
}
.timeline-wrapper {
  position: relative;
  width: 100%;
  padding: 0 48px; /* Chừa khoảng trống cho nút điều hướng tràn lề */
}
.timeline-track {
  display: flex;
  gap: 32px;
  overflow-x: auto;
  padding: 24px 0 36px; /* Chừa chỗ cho hiệu ứng scale của card active */
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none; /* Ẩn thanh cuộn mặc định */
}
.timeline-track::-webkit-scrollbar {
  display: none; /* Ẩn thanh cuộn trên Chrome/Safari */
}
.timeline-card {
  flex: 0 0 320px;
  scroll-snap-align: center;
  background: var(--surface);
  border: var(--glass-border);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: var(--r-lg);
  padding: 24px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), 
              border-color 0.4s ease, 
              box-shadow 0.4s ease, 
              background-color 0.4s ease,
              opacity 0.4s ease;
  opacity: 0.65; /* Các card hai bên mờ nhẹ để hướng tiêu điểm vào giữa */
  transform: scale(0.94);
}
/* Card active ở trung tâm */
.timeline-card.active-card {
  transform: scale(1.05);
  border-color: var(--accent);
  box-shadow: 0 16px 36px var(--accent-soft);
  opacity: 1;
  z-index: 2;
}
.timeline-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: var(--r-md);
  background: var(--surface-2);
}
.timeline-card h4 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
  margin: 0;
}
.timeline-card p {
  font-size: 0.9rem;
  color: var(--ink-2);
  line-height: 1.55;
  margin: 0;
}

/* Nút bấm tròn trắng/glassmorphic sang trọng */
.timeline-nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: #ffffff;
  border: 1px solid #e2e8f0;
  color: #4a5568;
  font-size: 1.3rem;
  font-weight: bold;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 14px rgba(0,0,0,0.06);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 10;
}
/* Hỗ trợ dark mode cho nút điều hướng */
[data-theme="dark"] .timeline-nav-btn {
  background: #2d3748;
  border-color: #4a5568;
  color: #e2e8f0;
  box-shadow: 0 4px 16px rgba(0,0,0,0.3);
}
.timeline-nav-btn:hover {
  background: var(--accent);
  color: #ffffff;
  border-color: var(--accent);
  transform: translateY(-50%) scale(1.1);
  box-shadow: 0 8px 20px var(--accent-soft);
}
.prev-btn {
  left: -4px;
}
.next-btn {
  right: -4px;
}
.timeline-nav-btn.disabled {
  opacity: 0;
  pointer-events: none;
}

/* Chấm trang (Dots Indicator) */
.timeline-dots {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
}
.timeline-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--line-2);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.timeline-dot.active {
  width: 24px;
  border-radius: 99px;
  background: var(--accent);
}

@media (max-width: 768px) {
  .timeline-wrapper {
    padding: 0 16px;
  }
  .timeline-nav-btn {
    display: none; /* Ẩn nút trên di động, vuốt trực quan hơn */
  }
  .timeline-card {
    flex: 0 0 280px;
  }
}

/* Modal Upgrades & Interactive Elements */
.modal-tabs {
  display: flex;
  gap: 8px;
  border-bottom: 1px solid var(--line-2);
  margin-bottom: 20px;
  padding-bottom: 10px;
  flex-wrap: wrap;
}

.tab-btn {
  background: transparent;
  border: none;
  padding: 8px 16px;
  font-size: .88rem;
  font-weight: 600;
  color: var(--ink-3);
  cursor: pointer;
  border-radius: var(--r-sm);
  transition: all 0.15s;
}

.tab-btn:hover {
  background: var(--surface-2);
  color: var(--ink);
}

.tab-btn.active {
  background: var(--accent);
  color: #fff;
}

.inline-modal {
  animation: fadeIn 0.2s ease-out;
}

/* Styled Table for Topics list */
#modalChuyenDe table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 10px;
}

#modalChuyenDe th, #modalChuyenDe td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--line-2);
  text-align: left;
}

#modalChuyenDe th {
  font-weight: 700;
  color: var(--ink-2);
  background: var(--surface-2);
}

#modalChuyenDe tr:hover td {
  background: var(--surface-2);
}

/* --- STUDENT ATTENDANCE POPUP MODAL --- */
.student-attendance-modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  animation: samFadeIn 0.25s ease;
}
.sam-inner {
  background: var(--surface);
  border: var(--glass-border);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: var(--r-lg);
  max-width: 400px;
  width: 100%;
  padding: 32px 24px;
  text-align: center;
  box-shadow: var(--shadow);
  position: relative;
  animation: samScaleUp 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.sam-close {
  position: absolute;
  top: 16px;
  right: 16px;
  font-size: 1.5rem;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--ink-3);
  line-height: 1;
}
.sam-close:hover {
  color: var(--ink);
}
.sam-icon {
  font-size: 3rem;
  margin-bottom: 12px;
  animation: samPulseIcon 2s infinite;
}
.sam-inner h2 {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 8px;
  color: var(--ink);
}
.sam-inner p {
  color: var(--ink-2);
  font-size: 0.9rem;
  margin-bottom: 4px;
}
.sam-session-title {
  font-weight: 700;
  font-size: 1rem;
  color: var(--accent);
  margin-bottom: 20px;
  padding: 8px 12px;
  background: var(--accent-soft);
  border-radius: var(--r-md);
  display: inline-block;
}
.sam-input-wrapper {
  margin: 12px 0;
}

@keyframes samFadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes samScaleUp {
  from { transform: scale(0.9); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}
@keyframes samPulseIcon {
  0% { transform: scale(1); }
  50% { transform: scale(1.15); }
  100% { transform: scale(1); }
}

/* --- APPLE CONTROL CENTER WIDGETS --- */
.control-center-wrapper {
  position: relative;
  display: inline-block;
  z-index: 999;
}
.control-center-btn {
  background: var(--topbar-btn-bg);
  border: var(--topbar-btn-border);
  color: var(--topbar-btn-text);
  width: 38px;
  height: 38px;
  border-radius: var(--r-sm);
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}
.control-center-btn:hover {
  background: var(--topbar-btn-hover-bg);
  color: var(--topbar-link-hover);
  border-color: var(--topbar-link-hover);
  transform: translateY(-1px);
}
.control-center-btn svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.control-center-panel {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 320px;
  background: var(--surface);
  border: var(--glass-border);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow);
  padding: 18px;
  display: none;
  flex-direction: column;
  gap: 14px;
  animation: ccSlideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 1000;
}
.control-center-panel.open {
  display: flex;
}

@keyframes ccSlideUp {
  from { transform: translateY(12px) scale(0.95); opacity: 0; }
  to { transform: translateY(0) scale(1); opacity: 1; }
}

/* Widgets Grid */
.cc-widgets-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.cc-widget {
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--r-md);
  padding: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}
[data-theme="light"] .cc-widget {
  background: rgba(0, 0, 0, 0.04);
  border-color: rgba(0, 0, 0, 0.03);
}
.cc-widget-icon {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 0.95rem;
}
.cc-widget-info {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}
.cc-widget-info b {
  font-size: 0.85rem;
  color: var(--ink);
}
.cc-widget-info span {
  font-size: 0.72rem;
  color: var(--ink-2);
}

/* Slider Controls */
.cc-control-row {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--r-md);
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
[data-theme="light"] .cc-control-row {
  background: rgba(0, 0, 0, 0.02);
  border-color: rgba(0, 0, 0, 0.03);
}
.cc-control-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink);
}
.cc-control-label span {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
}
.cc-slider-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}
.cc-slider {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  border-radius: 99px;
  background: var(--line);
  outline: none;
  cursor: pointer;
}
.cc-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--surface-solid);
  box-shadow: 0 1px 3px rgba(0,0,0,0.15);
  transition: transform 0.1s;
}
.cc-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

/* Segmented Theme Switcher */
.cc-theme-switcher {
  display: flex;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--r-md);
  padding: 4px;
}
[data-theme="light"] .cc-theme-switcher {
  background: rgba(0, 0, 0, 0.02);
  border-color: rgba(0, 0, 0, 0.03);
}
.cc-theme-btn {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--ink-2);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 6px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}
.cc-theme-btn.active {
  background: var(--surface-solid);
  color: var(--ink);
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

/* Accent Color Picker */
.cc-color-picker {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--r-md);
  padding: 12px;
}
[data-theme="light"] .cc-color-picker {
  background: rgba(0, 0, 0, 0.02);
  border-color: rgba(0, 0, 0, 0.03);
}
.cc-color-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink);
}
.cc-color-dots {
  display: flex;
  gap: 8px;
}
.cc-color-dot {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  border: 2px solid var(--surface-solid);
}
.cc-color-dot:hover {
  transform: scale(1.25);
}
.cc-color-dot.active {
  transform: scale(1.25);
  box-shadow: 0 0 0 2px var(--accent);
}

/* --- VINHMATH AI CHAT WIDGET --- */
.ai-chat-bubble {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--accent-gradient);
  color: #fff;
  display: grid;
  place-items: center;
  box-shadow: 0 4px 20px var(--accent-soft), 0 0 10px var(--accent-soft);
  cursor: pointer;
  z-index: 9999;
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.ai-chat-bubble:hover {
  transform: scale(1.1) rotate(5deg);
  box-shadow: 0 8px 24px var(--accent-soft), 0 0 15px var(--accent);
}
.ai-chat-bubble svg {
  width: 24px;
  height: 24px;
}
.ai-chat-box {
  position: fixed;
  bottom: 92px;
  right: 24px;
  width: 380px;
  height: 520px;
  max-width: 90vw;
  max-height: 80vh;
  border-radius: var(--r-lg, 14px);
  background: var(--surface);
  border: var(--glass-border);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--shadow);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: aiChatSlideIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  transition: background-color 0.3s, border-color 0.3s;
}
@keyframes aiChatSlideIn {
  from { transform: translateY(20px) scale(0.95); opacity: 0; }
  to { transform: translateY(0) scale(1); opacity: 1; }
}
.acb-header {
  padding: 14px 16px;
  background: var(--accent-gradient);
  color: #fff;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 700;
  font-size: 0.95rem;
}
.acb-title {
  display: flex;
  align-items: center;
  gap: 8px;
}
.acb-close {
  background: none;
  border: none;
  color: #fff;
  font-size: 1.5rem;
  cursor: pointer;
  line-height: 1;
  opacity: 0.8;
  transition: opacity 0.2s;
}
.acb-close:hover {
  opacity: 1;
}
.acb-body {
  flex: 1;
  padding: 16px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 0.92rem;
  background: transparent;
}
.acb-msg {
  max-width: 80%;
  padding: 10px 14px;
  border-radius: 14px;
  line-height: 1.5;
  word-break: break-word;
}
.acb-msg.ai {
  background: var(--surface-2);
  color: var(--ink);
  align-self: flex-start;
  border-bottom-left-radius: 4px;
  border: 1px solid var(--line-2);
}
.acb-msg.user {
  background: var(--accent);
  color: #fff;
  align-self: flex-end;
  border-bottom-right-radius: 4px;
}
.acb-msg p {
  color: inherit;
  margin-bottom: 0.5em;
}
.acb-msg p:last-child {
  margin-bottom: 0;
}
.acb-msg ul, .acb-msg ol {
  padding-left: 1.2em;
  margin: 0.5em 0;
}
.acb-msg a {
  color: inherit;
  text-decoration: underline;
}
.acb-msg code {
  background: rgba(0,0,0,0.1);
  padding: 1px 4px;
  border-radius: 4px;
  font-family: var(--font-mono, monospace);
  font-size: 0.85em;
}
[data-theme="dark"] .acb-msg code {
  background: rgba(255,255,255,0.15);
}
.acb-footer {
  padding: 12px;
  border-top: 1px solid var(--line-2);
  display: flex;
  gap: 8px;
  background: var(--surface-solid);
}
.acb-footer input {
  flex: 1;
  border: 1px solid var(--line-2);
  border-radius: 8px;
  padding: 8px 12px;
  font-family: inherit;
  font-size: 0.9rem;
  background: var(--surface);
  color: var(--ink);
  outline: none;
  transition: border-color 0.2s;
}
.acb-footer input:focus {
  border-color: var(--accent);
}
.acb-footer button {
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
}
.acb-typing {
  display: flex;
  gap: 4px;
  padding: 12px 16px;
  align-self: flex-start;
  background: var(--surface-2);
  border-radius: 14px;
  border-bottom-left-radius: 4px;
  border: 1px solid var(--line-2);
}
.acb-typing span {
  width: 6px;
  height: 6px;
  background: var(--ink-3);
  border-radius: 50%;
  animation: acbTyping 1.4s infinite both;
}
.acb-typing span:nth-child(2) { animation-delay: .2s; }
.acb-typing span:nth-child(3) { animation-delay: .4s; }
@keyframes acbTyping {
  0%, 80%, 100% { transform: scale(0.6); opacity: 0.4; }
  40% { transform: scale(1); opacity: 1; }
}

/* CC Toggle row styling */
.cc-toggle-row {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--r-md);
  padding: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
[data-theme="light"] .cc-toggle-row {
  background: rgba(0, 0, 0, 0.02);
  border-color: rgba(0, 0, 0, 0.03);
}
.cc-toggle-label {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
}
.cc-toggle-label b {
  font-size: 0.82rem;
  color: var(--ink);
}
.cc-toggle-label span {
  font-size: 0.7rem;
  color: var(--ink-2);
}
.cc-switch {
  position: relative;
  display: inline-block;
  width: 46px;
  height: 24px;
}
.cc-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}
.cc-slider-switch {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background-color: var(--line);
  border-radius: 24px;
  transition: .3s;
}
.cc-slider-switch:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: var(--surface-solid);
  border-radius: 50%;
  transition: .3s;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}
.cc-switch input:checked + .cc-slider-switch {
  background-color: var(--accent);
}
.cc-switch input:checked + .cc-slider-switch:before {
  transform: translateX(22px);
}
.cc-input-row {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--r-md);
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
[data-theme="light"] .cc-input-row {
  background: rgba(0, 0, 0, 0.02);
  border-color: rgba(0, 0, 0, 0.03);
}
.cc-input-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink);
}
.cc-input-group {
  display: flex;
  gap: 6px;
}
.cc-input-group input {
  flex: 1;
  padding: 6px 10px;
  border-radius: 6px;
  border: 1px solid var(--line-2);
  background: var(--surface);
  color: var(--ink);
  font-size: 0.8rem;
  font-family: var(--font-mono, monospace);
  outline: none;
}
.cc-input-group button {
  padding: 6px 12px;
  font-size: 0.8rem;
  border-radius: 6px;
}

/* ===== TỐI ƯU GIAO DIỆN MOBILE TOÀN HỆ THỐNG ===== */
@media (max-width: 960px) {
  /* Cho phép thanh đầu trang chứa menu burger thu gọn */
  .topbar .nav {
    flex-wrap: nowrap !important;
    gap: 10px !important;
    padding: 10px 16px !important;
    justify-content: space-between !important;
    align-items: center !important;
  }
}

@media (max-width: 768px) {
  /* Chặn cuộn ngang toàn trang -> hết tình trạng trượt sang phải bị dư một khúc.
     (Lịch tuần/bảng rộng vẫn cuộn được bên trong khung của nó) */
  html, body { overflow-x: hidden !important; max-width: 100% !important; }

  /* 1. Tối ưu Topbar (Thanh đầu trang) không bị vỡ/xuống dòng */
  .topbar .nav {
    padding: 8px 10px !important;
    gap: 6px !important;
    max-width: 100% !important;
  }
  /* Ẩn các nút rườm rà trên mobile để tránh chật chội */
  #controlCenterWrapper,
  #screenshotBtn {
    display: none !important;
  }
  /* Đảm bảo các nút còn lại không bị rớt chữ */
  .topbar .btn,
  .topbar button,
  .topbar a {
    white-space: nowrap !important;
  }
  /* Luôn giữ nút menu ☰ và chuông hiển thị, không bị cắt */
  .nav-burger, .bell-wrap { flex: 0 0 auto !important; }
  /* Ẩn nhãn vai trò (QUẢN TRỊ) trên mobile để chừa chỗ cho nút ☰ */
  .role-badge { display: none !important; }
  .logo {
    font-size: 1rem !important;
    gap: 6px !important;
    flex-shrink: 0 !important;
  }
  .logo .dot {
    width: 26px !important;
    height: 26px !important;
    font-size: 0.85rem !important;
  }
  .logo img {
    width: 26px !important;
    height: 26px !important;
  }
  .logo small {
    display: none !important; /* Ẩn chữ phụ trên mobile */
  }
  
  /* Giảm khoảng cách trong div tiện ích bên phải */
  .topbar .nav > div[style*="display:flex"],
  .topbar .nav > div {
    gap: 6px !important;
  }
  
  /* Biến nút Đăng xuất thành biểu tượng để siêu tiết kiệm diện tích */
  .topbar button[onclick*="dangXuat"] {
    font-size: 0 !important;
    padding: 8px 10px !important;
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    min-width: 36px !important;
    height: 36px !important;
    border-radius: var(--r-sm, 8px) !important;
  }
  .topbar button[onclick*="dangXuat"]::before {
    content: "🚪";
    font-size: 1.05rem !important;
  }

  /* Bảng Control Center: thành tấm phủ gần full màn hình, cuộn được, không bị khuất/lệch */
  .control-center-panel {
    position: fixed !important;
    top: 58px !important;
    left: 10px !important;
    right: 10px !important;
    width: auto !important;
    max-width: none !important;
    max-height: calc(100vh - 72px) !important;
    overflow-y: auto !important;
    -webkit-overflow-scrolling: touch;
  }

  /* Khung chat Trợ lý AI cũng vừa màn hình, không tràn ra ngoài */
  #aiChatBox {
    left: 10px !important;
    right: 10px !important;
    width: auto !important;
    max-width: none !important;
    bottom: 80px !important;
    max-height: calc(100vh - 150px) !important;
  }

  /* 2. Tối ưu kiểu chữ, nút bấm & thẻ trên mobile */
  h1 { font-size: 1.6rem !important; }
  h2 { font-size: 1.3rem !important; }
  h3 { font-size: 1.12rem !important; }

  .wrap {
    padding: 0 16px 64px !important; /* Thu hẹp lề hai bên lề để tăng diện tích hiển thị */
  }
  
  .card, [class*="-card"] {
    padding: 16px !important; /* Giảm padding thẻ */
  }
  
  .btn {
    padding: 8px 14px !important;
    font-size: 0.88rem !important;
  }
  .btn-sm {
    padding: 6px 10px !important;
    font-size: 0.8rem !important;
  }
  .input {
    padding: 8px 12px !important;
    font-size: 0.9rem !important;
  }

  /* Đảm bảo bảng biểu tự cuộn ngang khi tràn */
  .card:has(table) {
    overflow-x: auto !important;
  }
  th, td {
    padding: 8px 10px !important; /* Thu nhỏ cell padding */
  }

  /* 3. Tối ưu mục Blog trên trang chủ */
  .blog-sec-head {
    flex-direction: column !important;
    align-items: flex-start !important;
    gap: 8px !important;
    margin-bottom: 12px !important;
  }
  .blog-sec-head h2 {
    font-size: 1.15rem !important;
  }
  #btnVietBlogTrangChu {
    width: auto !important;
    padding: 6px 12px !important;
  }
  .blog-slider-container {
    padding: 12px !important;
  }
  .blog-slider {
    gap: 12px !important;
  }
  .blog-card {
    flex: 0 0 250px !important; /* Giảm chiều rộng card trên mobile */
    padding: 14px !important;
  }
  .blog-card .bc-title {
    font-size: 0.98rem !important;
  }
  .blog-card .bc-ex {
    font-size: 0.82rem !important;
  }
  
  /* 4. Tối ưu bảng Lịch tuần và Đếm ngược để vừa vặn hơn */
  .date-display-card {
    padding: 20px 14px !important;
  }
  .date-day-num {
    font-size: 3.5rem !important;
  }
  .countdown-timer-grid {
    gap: 6px !important;
  }
  .timer-box {
    padding: 8px 4px !important;
  }
  .timer-box b {
    font-size: 1.1rem !important;
  }
  .timer-box span {
    font-size: 0.65rem !important;
  }
}

@media (max-width: 480px) {
  /* Lề cực nhỏ cho màn hình siêu hẹp như iPhone SE */
  .wrap {
    padding: 0 12px 48px !important;
  }
  
  /* Đăng nhập di động */
  .main {
    padding: 24px 12px !important;
  }
  .box {
    padding: 24px 16px !important;
    border-radius: var(--r-sm) !important;
  }

  /* Khung thống kê nhanh 3 cột nằm ngang cực sang xịn mịn */
  .stats .grid-3 {
    grid-template-columns: repeat(3, 1fr) !important;
    gap: 6px !important;
  }
  .stats .stat {
    padding: 8px 4px !important;
  }
  .stats .stat b {
    font-size: 1.1rem !important;
  }
  .stats .stat span {
    font-size: 0.62rem !important;
    line-height: 1.25 !important;
  }
}


/* ============================================================
   BỘ NHẬN DIỆN CLB M.A.P (áp cho lớp có theme = map)
   ============================================================ */
body.theme-map {
  --accent:#1B2644; --accent-soft:#EAEFF6;
  /* Gradient nút/nhấn: đổi vàng -> navy (chữ trắng dễ đọc trên nền sáng) */
  --accent-gradient: linear-gradient(135deg, #2A3B66 0%, #16213D 100%);
  --accent-2:#24335C; --accent-strong:#16213D; --gold:#1B2644;
  --topbar-link-active: var(--accent); --topbar-link-hover: var(--accent);
}
/* Dark mode: làm xanh navy sáng lên, nổi bật dễ nhìn */
[data-theme="dark"] body.theme-map {
  --accent:#8FB3EC; --accent-soft:#233149;
  --accent-gradient: linear-gradient(135deg, #3E5EA0 0%, #24335C 100%);
  --accent-2:#5B7FC0; --accent-strong:#8FB3EC; --gold:#8FB3EC;
  --topbar-link-active: var(--accent); --topbar-link-hover: var(--accent);
}
/* Ép các mảng vàng đặc trưng còn sót (badge/gạch chân/vòng %) sang navy trong theme M.A.P */
body.theme-map .new-lesson-badge,
body.theme-map .badge-accent { background: var(--accent-gradient) !important; color:#fff !important; }

/* Logo chìm giữa màn hình, mờ, đè lên mọi cửa sổ (không chặn thao tác) */
#mapWatermarkGlobal {
  position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%);
  width: min(620px, 60vw); max-width: 620px; height: auto;
  opacity: .06; pointer-events: none; z-index: 9998; display: none; user-select: none;
}
[data-theme="dark"] #mapWatermarkGlobal { opacity: .12; }
body.theme-map #mapWatermarkGlobal { display: block; }

/* Logo M.A.P to & nổi bật hơn trên thanh điều hướng */
body.theme-map .topbar .logo img { width:44px; height:44px; border-radius:50%; object-fit:contain; }
body.theme-map .topbar .logo { font-size:1.3rem; letter-spacing:.08em; }

/* ============================================================
   BỘ NHẬN DIỆN TRUNG TÂM DUY MINH (áp cho lớp có theme = duyminh)
   Tông đỏ – trắng. DUY đỏ · MINH trắng.
   ============================================================ */
body.theme-duyminh {
  --accent:#C81E27; --accent-soft:#FCEBEC;
  --accent-gradient: linear-gradient(135deg, #D42730 0%, #8E1018 100%);
  --accent-2:#A5161E; --accent-strong:#8E1119; --gold:#C81E27;
  --topbar-link-active: var(--accent); --topbar-link-hover: var(--accent);
}
/* Dark mode: đỏ sáng hơn để nổi bật, dễ đọc trên nền tối */
[data-theme="dark"] body.theme-duyminh {
  --accent:#F3767B; --accent-soft:#3A1F22;
  --accent-gradient: linear-gradient(135deg, #E5484D 0%, #B0313A 100%);
  --accent-2:#E5565C; --accent-strong:#F3767B; --gold:#F3767B;
  --topbar-link-active: var(--accent); --topbar-link-hover: var(--accent);
}
body.theme-duyminh .new-lesson-badge,
body.theme-duyminh .badge-accent { background: var(--accent-gradient) !important; color:#fff !important; }
body.theme-duyminh .topbar .logo img { width:44px; height:44px; border-radius:50%; object-fit:contain; }
body.theme-duyminh .topbar .logo { font-size:1.3rem; letter-spacing:.05em; }
/* Wordmark DUY (đỏ) + MINH (trắng trên nền đỏ) — đọc tốt trên nền sáng lẫn tối */
.dm-mark { display:inline-flex; align-items:center; font-weight:900; letter-spacing:.02em; }
.dm-mark .dm-duy { color:var(--accent); }
.dm-mark .dm-minh { background:var(--accent); color:#fff; padding:0 6px; border-radius:5px; margin-left:3px; }

/* =========================================================================
   LỚP TINH CHỈNH "ANTIGRAVITY × VINHMATH"  (v6.0)
   Cảm hứng antigravity.google: tối giản, nhiều khoảng trắng, chuyển động
   mượt & tinh tế, dải sáng aurora nhẹ. Giữ bản sắc VÀNG GOLD của VinhMath
   (đen + vàng ở nền tối, kem/trắng + vàng ở nền sáng).
   ========================================================================= */
:root {
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);      /* mượt, giảm tốc êm */
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1); /* nảy nhẹ tinh tế */
  --dur-1: 0.18s;
  --dur-2: 0.35s;
  --dur-3: 0.6s;
  --r-xl: 22px;
  --r-pill: 999px;
  /* Bóng đổ nhiều lớp, mềm mại kiểu Apple/Google */
  --shadow-soft: 0 1px 2px rgba(20,20,40,.04), 0 8px 24px rgba(20,20,40,.06);
  --shadow-lift: 0 2px 6px rgba(20,20,40,.06), 0 18px 40px rgba(20,20,40,.12);
  --aurora-1: rgba(223, 188, 94, 0.28);  /* vàng gold */
  --aurora-2: rgba(48, 120, 200, 0.16);  /* xanh dương nhạt */
  --aurora-3: rgba(240, 176, 64, 0.14);
  /* Đổ màu gradient vàng dịu cho thẻ (thay thanh vàng cạnh trên) — nền sáng */
  --card-glow:
    radial-gradient(circle at 20% -12%, rgba(224,160,32,0.10), transparent 56%),
    radial-gradient(circle at 84% -4%, rgba(181,96,52,0.055), transparent 56%);
}
[data-theme="dark"] {
  --shadow-soft: 0 1px 2px rgba(0,0,0,.5), 0 10px 30px rgba(0,0,0,.45);
  --shadow-lift: 0 2px 8px rgba(0,0,0,.55), 0 24px 60px rgba(0,0,0,.6);
  --aurora-1: rgba(223, 188, 94, 0.20);
  --aurora-2: rgba(70, 140, 220, 0.12);
  --aurora-3: rgba(243, 212, 131, 0.10);
  /* Đổ màu gradient ấm hơn cho nền tối (giống bảng vinh danh) */
  --card-glow:
    radial-gradient(circle at 20% -12%, rgba(241,196,15,0.13), transparent 56%),
    radial-gradient(circle at 84% -4%, rgba(181,72,58,0.10), transparent 56%);
}

/* --- Chuyển động mượt cho các thành phần tương tác --- */
a, button, .btn, .card, .nav-btn, .navlinks a, input, select, textarea, summary {
  transition: color var(--dur-1) var(--ease-out),
              background-color var(--dur-1) var(--ease-out),
              border-color var(--dur-1) var(--ease-out),
              box-shadow var(--dur-2) var(--ease-out),
              transform var(--dur-2) var(--ease-out);
}

/* --- Nút bấm tinh chỉnh: nâng nhẹ khi hover, bo tròn mềm --- */
.btn { border-radius: var(--r-md); }
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-lg { border-radius: var(--r-pill); padding: 14px 30px; font-weight: 700; letter-spacing: .01em; }
.btn-primary.btn-lg:hover { box-shadow: 0 10px 30px var(--accent-soft), 0 4px 12px var(--accent-soft); }

/* --- Thẻ (card) nâng nhẹ mềm mại --- */
.card { box-shadow: var(--shadow-soft); }
.card:hover { box-shadow: var(--shadow-lift); }

/* --- Vòng focus vàng gold rõ ràng, dễ nhìn (a11y) --- */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* --- Thanh cuộn mảnh, tinh tế --- */
* { scrollbar-width: thin; scrollbar-color: var(--accent-soft) transparent; }
*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-thumb { background: color-mix(in srgb, var(--accent) 35%, transparent); border-radius: 999px; border: 2px solid transparent; background-clip: padding-box; }
*::-webkit-scrollbar-thumb:hover { background: color-mix(in srgb, var(--accent) 55%, transparent); background-clip: padding-box; }

/* =========================================================================
   AURORA — dải sáng gradient mềm, trôi rất chậm (phong cách antigravity)
   Đặt <div class="vm-aurora"><span></span><span></span><span></span></div>
   ngay sau <body> để có nền sáng dịu. Rất nhẹ, không gây rối mắt.
   ========================================================================= */
.vm-aurora {
  position: fixed; inset: 0; z-index: -2; overflow: hidden; pointer-events: none;
}
.vm-aurora span {
  position: absolute; display: block; border-radius: 50%;
  filter: blur(70px); opacity: .9; will-change: transform;
}
.vm-aurora span:nth-child(1) {
  width: 46vw; height: 46vw; left: -8vw; top: -10vw;
  background: radial-gradient(circle at 50% 50%, var(--aurora-1), transparent 70%);
  animation: auroraDrift1 26s var(--ease-out) infinite alternate;
}
.vm-aurora span:nth-child(2) {
  width: 40vw; height: 40vw; right: -6vw; top: 8vh;
  background: radial-gradient(circle at 50% 50%, var(--aurora-2), transparent 70%);
  animation: auroraDrift2 32s var(--ease-out) infinite alternate;
}
.vm-aurora span:nth-child(3) {
  width: 38vw; height: 38vw; left: 30vw; bottom: -14vw;
  background: radial-gradient(circle at 50% 50%, var(--aurora-3), transparent 70%);
  animation: auroraDrift3 38s var(--ease-out) infinite alternate;
}
@keyframes auroraDrift1 { from { transform: translate3d(0,0,0) scale(1); } to { transform: translate3d(6vw,4vh,0) scale(1.12); } }
@keyframes auroraDrift2 { from { transform: translate3d(0,0,0) scale(1.05); } to { transform: translate3d(-5vw,6vh,0) scale(1); } }
@keyframes auroraDrift3 { from { transform: translate3d(0,0,0) scale(1); } to { transform: translate3d(4vw,-5vh,0) scale(1.15); } }

/* =========================================================================
   SCROLL REVEAL — hiện dần khi cuộn tới (JS gắn .is-visible)
   ========================================================================= */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity var(--dur-3) var(--ease-out), transform var(--dur-3) var(--ease-out); animation: revealFailsafe 0s linear 3s forwards; }
.reveal.is-visible, .reveal.active { opacity: 1; transform: none; }
/* Failsafe: nếu JS lỗi/không chạy, vẫn hiện nội dung sau 1.5s (không khoá màn đăng nhập) */
@keyframes revealFailsafe { to { opacity: 1; transform: none; } }
.reveal-delay-1 { transition-delay: .08s; }
.reveal-delay-2 { transition-delay: .16s; }
.reveal-delay-3 { transition-delay: .24s; }
.reveal-scale { transform: translateY(22px) scale(.98); }
.reveal-scale.is-visible, .reveal-scale.active { transform: none; }
/* An toàn: nếu JS không chạy, sau 1.2s vẫn hiện nội dung */
.no-js .reveal { opacity: 1; transform: none; }

/* --- Tôn trọng người dùng tắt hiệu ứng chuyển động --- */
@media (prefers-reduced-motion: reduce) {
  .vm-aurora span { animation: none !important; }
  .reveal { opacity: 1 !important; transform: none !important; }
  a, button, .btn, .card { transition: none !important; }
  * { scroll-behavior: auto !important; }
}

/* Cuộn mượt toàn trang */
html { scroll-behavior: smooth; }

/* ===== FIX MODAL BỊ ĐẨY LÊN CAO CHE NÚT X (áp dụng mọi trang) ===== */
/* Modal căn từ trên xuống + chừa khoảng cho thanh điều hướng cố định, cho phép cuộn overlay khi nội dung dài */
.modal {
  align-items: flex-start !important;
  overflow-y: auto !important;
  padding: 84px 14px 28px !important;
  -webkit-overflow-scrolling: touch;
}
.modal > .modal-content {
  max-height: none !important;
  margin-left: auto !important;
  margin-right: auto !important;
}
@media (max-width: 640px) {
  .modal { padding: 70px 10px 24px !important; }
}