@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700;800&display=swap');
 
/* ---------- 1. DESIGN TOKENS ---------- */
:root{
  /* Thương hiệu */
  --matcha-primary:      #7EA88A;
  --matcha-primary-dark: #5C8265;
  --matcha-primary-light:#A9C9B4;
  --matcha-deep:         #2F4736;
  --matcha-deep-2:       #3F6250;
  --matcha-pale:         #F2F8F4;
  --matcha-badge-bg:     #DCEAE0;
  --matcha-badge-text:   #4C7358;
 
  /* Chữ */
  --text-dark:  #22302A;
  --text-muted: #62766B;
  --text-faint: #98A79E;
  --white:      #FFFFFF;
 
  /* Viền / nền phụ */
  --border-color: #E4EAE6;
  --surface-tint: #FAFCFA;
 
  /* Trạng thái / số liệu */
  --stat-blue:     #3F72AF;
  --stat-blue-bg:  #E7F0FA;
  --stat-orange:   #C97A2E;
  --stat-orange-bg:#FBEEDF;
  --stat-green:    var(--matcha-primary-dark);
  --stat-green-bg: #E7F3EA;
  --danger:      #C24B41;
  --danger-bg:   #FBECEA;
  --success:     #3F8256;
  --success-bg:  #E9F5EC;
 
  /* Bo góc & bóng đổ */
  --radius-s: 10px;
  --radius-m: 16px;
  --radius-l: 24px;
  --radius-pill: 999px;
  --shadow-soft: 0 4px 14px rgba(34,48,42,.06);
  --shadow-card: 0 10px 30px -12px rgba(34,48,42,.18);
  --shadow-lift: 0 20px 40px -16px rgba(34,48,42,.28);
 
  --font-main: 'Poppins', sans-serif;
}
 
/* ---------- 2. RESET & BASE ---------- */
*, *::before, *::after{ box-sizing:border-box; }
 
html{ scroll-behavior:smooth; }
 
body{
  margin:0;
  font-family:var(--font-main);
  color:var(--text-dark);
  background:var(--matcha-pale);
  -webkit-font-smoothing:antialiased;
  line-height:1.6;
}
 
h1,h2,h3,h4{ margin:0 0 .5em; font-weight:700; letter-spacing:-0.01em; color:var(--text-dark); }
p{ margin:0 0 1em; color:var(--text-muted); }
a{ color:inherit; text-decoration:none; }
ul{ list-style:none; margin:0; padding:0; }
img{ max-width:100%; display:block; }
 
button{
  cursor:pointer;
  border:none;
  font-family:inherit;
  background:none;
  color:inherit;
}
 
.hidden{ display:none !important; }
 
/* Focus rõ ràng cho bàn phím (a11y) */
a:focus-visible,
button:focus-visible,
input:focus-visible,
label:focus-within{
  outline:2px solid var(--matcha-primary-dark);
  outline-offset:2px;
  border-radius:4px;
}
 
@media (prefers-reduced-motion: reduce){
  *{ animation-duration:.001ms !important; transition-duration:.001ms !important; scroll-behavior:auto !important; }
}
 
/* Khung căn giữa dùng chung */
.container{
  max-width:1120px;
  margin:0 auto;
  padding:0 24px;
}
 
/* "Thẻ" nổi màu trắng cho từng khối nội dung chính */
.panel-card{
  background:var(--white);
  border-radius:var(--radius-l);
  box-shadow:var(--shadow-card);
  padding:36px clamp(20px,4vw,44px);
  margin:28px auto 48px;
  border:1px solid var(--border-color);
}
 
/* ---------- 3. NAVBAR ---------- */
.navbar{
  position:sticky;
  top:0;
  z-index:100;
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--border-color);
}
 
.nav-content{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  padding-top:16px;
  padding-bottom:16px;
}
 
.logo{
  font-size:22px;
  font-weight:800;
  color:var(--text-dark);
  letter-spacing:-.02em;
  white-space:nowrap;
}
.logo span{ color:var(--matcha-primary-dark); }
 
.nav-links{
  display:flex;
  align-items:center;
  gap:32px;
  font-size:15px;
  font-weight:500;
  color:var(--text-dark);
}
.nav-links a{
  position:relative;
  padding:6px 2px;
  transition:color .15s ease;
}
.nav-links a:hover{ color:var(--matcha-primary-dark); }
.nav-links a.active{ color:var(--matcha-primary-dark); }
.nav-links a.active::after{
  content:"";
  position:absolute;
  left:0; right:0; bottom:-4px;
  height:2px;
  border-radius:2px;
  background:var(--matcha-primary);
}
.login-link{ opacity:.85; }
 
.nav-right{ display:flex; align-items:center; gap:16px; }
 
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 24px;
  border-radius:var(--radius-pill);
  font-weight:600;
  font-size:14.5px;
  transition:transform .15s ease, box-shadow .15s ease, background .15s ease;
  white-space:nowrap;
}
.btn-primary{
  background:var(--matcha-primary);
  color:var(--white);
  box-shadow:0 8px 18px -8px rgba(94,133,101,.55);
}
.btn-primary:hover{ background:var(--matcha-primary-dark); transform:translateY(-1px); }
 
/* Chip thông tin học viên trên thanh điều hướng (được JS điền dữ liệu) —
   giờ là link dẫn tới trang hồ sơ cá nhân (profile.html) */
.nav-user-chip{
  display:flex;
  align-items:center;
  gap:10px;
  padding:6px 14px 6px 6px;
  border-radius:var(--radius-pill);
  background:var(--matcha-badge-bg);
  font-size:13.5px;
  font-weight:600;
  color:var(--matcha-badge-text);
  transition:background .15s ease, transform .15s ease;
}
.nav-user-chip:hover{
  background:var(--matcha-primary);
  color:var(--white);
  transform:translateY(-1px);
}
.nav-user-chip:hover .avatar-sm{
  background:var(--white);
  color:var(--matcha-primary-dark);
}
.nav-user-chip .avatar-sm{
  width:28px; height:28px;
  border-radius:50%;
  background:var(--matcha-primary);
  color:var(--white);
  display:flex; align-items:center; justify-content:center;
  font-size:12px; font-weight:700;
}
 
@media (max-width:860px){
  .nav-links{ display:none; }
}
 
/* ---------- 4. WELCOME / STUDENT INFO BAR ---------- */
.welcome-bar{
  display:flex;
  align-items:center;
  gap:20px;
  padding:22px 26px;
  border-radius:var(--radius-m);
  background:linear-gradient(120deg, var(--matcha-deep) 0%, var(--matcha-deep-2) 100%);
  color:var(--white);
  margin-bottom:28px;
  position:relative;
  overflow:hidden;
}
.welcome-bar::after{
  content:"";
  position:absolute;
  right:-40px; top:-60px;
  width:200px; height:200px;
  border-radius:50%;
  background:rgba(255,255,255,.06);
}
.welcome-avatar{
  flex:none;
  width:56px; height:56px;
  border-radius:50%;
  background:rgba(255,255,255,.16);
  border:2px solid rgba(255,255,255,.35);
  display:flex; align-items:center; justify-content:center;
  font-size:20px; font-weight:700;
  z-index:1;
}
.welcome-text{ z-index:1; }
.welcome-eyebrow{
  margin:0 0 2px;
  font-size:12.5px;
  text-transform:uppercase;
  letter-spacing:.08em;
  color:rgba(255,255,255,.65);
}
.welcome-text h2{ margin:0 0 4px; color:var(--white); font-size:21px; }
.welcome-sub{ margin:0; font-size:13.5px; color:rgba(255,255,255,.8); }
.welcome-sub span{ font-weight:600; color:var(--white); }
 
@media (max-width:560px){
  .welcome-bar{ flex-direction:column; align-items:flex-start; text-align:left; }
}
 
/* [THÊM MỚI] Banner "Lớp đang học" — tiến độ / điểm / hạng của học viên trong lớp thật */
.my-class-banner{
  display:flex;
  align-items:center;
  gap:24px;
  flex-wrap:wrap;
  padding:20px 26px;
  border-radius:var(--radius-m);
  background:var(--surface-tint);
  border:1.5px solid var(--matcha-primary-light);
  margin-bottom:28px;
}
.my-class-info{ flex:1; min-width:220px; }
.my-class-info h3{ margin:2px 0 10px; font-size:18px; color:var(--text-dark); }
.my-class-progress{ display:flex; align-items:center; gap:12px; }
.progress-track{
  flex:1; max-width:220px;
  height:8px; border-radius:99px;
  background:var(--border-color);
  overflow:hidden;
}
.progress-fill{
  height:100%; border-radius:99px;
  background:linear-gradient(90deg, var(--matcha-primary), var(--matcha-primary-dark));
  transition:width .5s ease;
}
#my-class-progress-text{ font-size:12.5px; color:var(--text-muted); font-weight:600; white-space:nowrap; }

.my-class-stats{ display:flex; gap:22px; flex:none; }
.my-class-stat{ text-align:center; }
.my-class-stat .stat-label{
  display:block; font-size:11px; color:var(--text-muted);
  margin-bottom:4px; text-transform:uppercase; letter-spacing:.04em;
}
.my-class-stat strong{ font-size:21px; color:var(--matcha-primary-dark); }

#btn-goto-my-class{ flex:none; white-space:nowrap; }

@media (max-width:700px){
  .my-class-banner{ flex-direction:column; align-items:stretch; }
  .my-class-stats{ justify-content:space-around; }
  .progress-track{ max-width:none; }
}

/* ---------- 5. STATS OVERVIEW (mini tổng quan trên trang chọn khóa) ---------- */
.stats-overview{
  display:grid;
  grid-template-columns:repeat(auto-fit, minmax(190px,1fr));
  gap:16px;
  margin-bottom:34px;
}
.summary-card{
  background:var(--surface-tint);
  padding:20px 22px;
  border-radius:var(--radius-m);
  border:1px solid var(--border-color);
  box-shadow:var(--shadow-soft);
  position:relative;
  overflow:hidden;
}
.summary-card::before{
  content:"";
  position:absolute; left:0; top:0; bottom:0;
  width:4px;
  background:var(--matcha-primary);
}
.summary-card h3{
  font-size:12.5px;
  font-weight:600;
  color:var(--text-muted);
  text-transform:uppercase;
  letter-spacing:.04em;
  margin-bottom:8px;
}
.summary-card .val{
  font-size:26px;
  font-weight:700;
  color:var(--matcha-primary-dark) !important;
}
 
/* ---------- 6. SECTION TITLES ---------- */
.section-heading{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:12px;
  margin-bottom:6px;
}
.section-heading h2{ font-size:24px; margin-bottom:0; }
.section-sub{ color:var(--text-muted); font-size:14.5px; margin-bottom:26px; }
 
/* ---------- 7. GRID & CARD (chọn khóa học / danh sách bài) ---------- */
.grid{
  display:grid;
  grid-template-columns:repeat(auto-fill, minmax(250px,1fr));
  gap:20px;
  margin-top:22px;

}
 
.card{
  position:relative;
  border:1px solid var(--border-color);
  padding:24px 22px 22px;
  border-radius:var(--radius-m);
  cursor:pointer;
  background:var(--white);
  box-shadow:var(--shadow-soft);
  transition:transform .18s ease, box-shadow .18s ease, border-color .18s ease;
  overflow:hidden;
}
.card::before{
  content:"";
  position:absolute; left:0; right:0; top:0;
  height:4px;
  background:var(--matcha-primary);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .25s ease;
}
.card:hover{
  box-shadow:var(--shadow-lift);
  transform:translateY(-4px);
  border-color:transparent;
}
.card:hover::before{ transform:scaleX(1); }
 
.card h3{ font-size:17.5px; margin:0 0 8px; color:var(--text-dark); }
.card p{ font-size:14px; margin-bottom:14px; }
 
/* Tô màu riêng cho 3 khóa học chính để dễ nhận diện */
#classes-grid .card:nth-child(1)::before{ background:var(--matcha-primary); }
#classes-grid .card:nth-child(2)::before{ background:var(--stat-blue); }
#classes-grid .card:nth-child(3)::before{ background:var(--stat-orange); }
 
.card .btn-primary{
  margin-top:6px;
  width:100%;
  padding:11px 18px;
}
 
/* Chip mô tả số câu / thời gian trong thẻ bài tập (được JS chèn) */
.lesson-meta{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin-bottom:16px;
}
.meta-chip{
  font-size:12.5px;
  font-weight:600;
  padding:5px 11px;
  border-radius:var(--radius-pill);
  background:var(--matcha-badge-bg);
  color:var(--matcha-badge-text);
}
.meta-chip-audio{ background:var(--stat-blue-bg); color:var(--stat-blue); }

/* [THÊM MỚI] Thẻ bài tập ĐÃ HOÀN THÀNH — tô xanh nhạt để dễ phân biệt */
.card.already-done{
  background:var(--success-bg);
  border-color:#BEE0C6;
}
.card.already-done::before{ background:var(--success); transform:scaleX(1); }
.done-badge{
  position:absolute; top:14px; right:14px;
  font-size:11px; font-weight:700;
  padding:4px 10px;
  border-radius:var(--radius-pill);
  background:var(--success);
  color:var(--white);
}
 
/* Nút xem thống kê */
.btn-outline{
  background:var(--white);
  border:1.5px solid var(--matcha-primary);
  color:var(--matcha-primary-dark);
}
.btn-outline:hover{
  background:var(--matcha-primary);
  color:var(--white);
}
.stats-cta{ text-align:center; margin:6px 0 8px; }
 
/* ---------- 8. NÚT QUAY LẠI ---------- */
.btn-back{
  background:transparent;
  color:var(--matcha-primary-dark);
  font-weight:600;
  padding:0;
  margin-bottom:18px;
  font-size:14.5px;
  text-decoration:none;
  display:inline-flex;
  align-items:center;
  gap:6px;
}
.btn-back:hover{ text-decoration:underline; }
 
#current-class-title{ font-size:23px; }
 
/* ---------- 9. GIAO DIỆN LÀM BÀI (SPLIT VIEW) ---------- */
.test-area{
  max-width:1320px;
  margin:28px auto 48px;
  background:var(--white);
  border-radius:var(--radius-l);
  height:88vh;
  min-height:560px;
  display:flex;
  flex-direction:column;
  overflow:hidden;
  box-shadow:var(--shadow-lift);
  border:1px solid var(--border-color);
}
 
.test-header{
  padding:16px clamp(18px,3vw,32px);
  background:linear-gradient(120deg, var(--matcha-deep) 0%, var(--matcha-deep-2) 100%);
  color:var(--white);
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:16px;
}
.test-header .btn-back{
  color:rgba(255,255,255,.9);
  background:rgba(255,255,255,.14);
  padding:6px 14px;
  border-radius:var(--radius-pill);
  margin-bottom:0;
  font-size:13.5px;
}
.test-header .btn-back:hover{ background:rgba(255,255,255,.24); text-decoration:none; }
#current-test-title{ font-size:17px; color:var(--white); margin:4px 0 0; }
 
.timer{
  font-size:15px;
  font-weight:700;
  background:rgba(255,255,255,.14);
  padding:9px 16px;
  border-radius:var(--radius-pill);
  display:flex;
  align-items:center;
  gap:8px;
  white-space:nowrap;
  transition:background .2s ease;
}
/* [THÊM MỚI] Nhấp nháy cảnh báo khi còn <= 60 giây */
.timer.timer-warning{
  background:var(--danger);
  animation:timer-pulse 1s ease-in-out infinite;
}
@keyframes timer-pulse{
  0%, 100% { opacity:1; }
  50% { opacity:.6; }
}
#timer{ font-variant-numeric:tabular-nums; }
 
.test-split-view{ display:flex; flex:1; overflow:hidden; }
 
.passage-panel{
  flex:1;
  padding:32px clamp(18px,3vw,36px);
  overflow-y:auto;
  border-right:1px solid var(--border-color);
  background:var(--surface-tint);
  line-height:1.85;
  font-size:15.5px;
}
.passage-panel h2{ font-size:20px; }

/* [THÊM MỚI] Khung phát audio bài nghe (Listening) */
.audio-player-box{
  background:var(--white);
  border:1px solid var(--border-color);
  border-radius:var(--radius-m);
  padding:16px 18px;
  margin-bottom:22px;
  box-shadow:var(--shadow-soft);
}
.audio-player-label{
  font-size:13px;
  font-weight:700;
  color:var(--matcha-primary-dark);
  margin:0 0 10px;
}
.audio-player-box audio{
  width:100%;
  height:38px;
}
 
.questions-panel{
  flex:1;
  padding:32px clamp(18px,3vw,36px);
  overflow-y:auto;
  background:var(--white);
}
 
/* Thanh cuộn tinh gọn */
.passage-panel::-webkit-scrollbar,
.questions-panel::-webkit-scrollbar{ width:8px; }
.passage-panel::-webkit-scrollbar-thumb,
.questions-panel::-webkit-scrollbar-thumb{
  background:var(--matcha-primary-light);
  border-radius:99px;
}
.passage-panel::-webkit-scrollbar-track,
.questions-panel::-webkit-scrollbar-track{ background:transparent; }
 
@media (max-width:900px){
  .test-area{ height:auto; }
  .test-split-view{ flex-direction:column; }
  .passage-panel{ border-right:none; border-bottom:1px solid var(--border-color); max-height:40vh; }
}
 
/* ---------- 10. CÂU HỎI ---------- */
.question-block{
  margin-bottom:22px;
  padding:20px;
  border:1px solid var(--border-color);
  border-radius:var(--radius-m);
  background:var(--surface-tint);
  transition:border-color .15s ease, box-shadow .15s ease;
}
.question-block:focus-within{
  border-color:var(--matcha-primary);
  box-shadow:0 0 0 3px rgba(126,168,138,.15);
}
 
.question-text{ margin-top:0; font-size:15.5px; display:flex; gap:10px; align-items:flex-start; }
 
.q-number{
  flex:none;
  width:26px; height:26px;
  border-radius:50%;
  background:var(--matcha-primary);
  color:var(--white);
  font-size:12.5px;
  font-weight:700;
  display:flex; align-items:center; justify-content:center;
  margin-top:1px;
}
 
.q-img{ max-width:100%; border-radius:var(--radius-s); margin-bottom:15px; border:1px solid var(--border-color); }
 
label{
  display:flex;
  align-items:center;
  gap:10px;
  padding:11px 14px;
  margin:8px 0;
  background:var(--white);
  border-radius:var(--radius-s);
  cursor:pointer;
  border:1.5px solid var(--border-color);
  font-size:14.5px;
  transition:background .15s ease, border-color .15s ease;
}
label:hover{ background:var(--matcha-badge-bg); border-color:var(--matcha-primary-light); }
label:has(input:checked){
  background:var(--matcha-badge-bg);
  border-color:var(--matcha-primary);
  font-weight:600;
  color:var(--matcha-primary-dark);
}
label input[type="radio"]{ accent-color:var(--matcha-primary-dark); width:16px; height:16px; flex:none; }
 
.text-input{
  width:100%;
  padding:12px 14px;
  border:1.5px solid var(--border-color);
  border-radius:var(--radius-s);
  box-sizing:border-box;
  font-family:inherit;
  font-size:14.5px;
  transition:border-color .15s ease, box-shadow .15s ease;
}
.text-input:focus{
  outline:none;
  border-color:var(--matcha-primary);
  box-shadow:0 0 0 3px rgba(126,168,138,.15);
}
 
.btn-submit{
  background:var(--matcha-primary);
  color:var(--white);
  width:100%;
  padding:15px;
  border-radius:var(--radius-s);
  font-size:16px;
  font-weight:700;
  margin-top:8px;
  box-shadow:0 10px 22px -10px rgba(94,133,101,.6);
  transition:background .15s ease, transform .15s ease;
}
.btn-submit:hover:not(:disabled){ background:var(--matcha-primary-dark); transform:translateY(-1px); }
.btn-submit:disabled{ opacity:.7; cursor:progress; }
 
/* ---------- 11. KẾT QUẢ ---------- */
.result-hero{
  display:flex;
  align-items:center;
  gap:28px;
  flex-wrap:wrap;
  padding-bottom:22px;
  margin-bottom:22px;
  border-bottom:1px solid var(--border-color);
}
.score-ring{
  --pct:0;
  flex:none;
  width:128px; height:128px;
  border-radius:50%;
  display:flex; align-items:center; justify-content:center;
  background:
    radial-gradient(closest-side, var(--white) 74%, transparent 75% 100%),
    conic-gradient(var(--matcha-primary) calc(var(--pct)*1%), var(--matcha-badge-bg) 0);
}
#score-display{
  font-size:30px;
  font-weight:800;
  color:var(--matcha-primary-dark);
}
.result-hero h2{ font-size:20px; margin-bottom:6px; }
.result-meta{ display:flex; gap:10px; flex-wrap:wrap; }
.result-meta p{
  margin:0;
  font-size:13.5px;
  background:var(--surface-tint);
  border:1px solid var(--border-color);
  padding:8px 14px;
  border-radius:var(--radius-pill);
}
.text-red{ color:var(--danger); }
.text-green{ color:var(--success); }
 
#detailed-results h3, .result-section-title{ font-size:17px; margin-bottom:16px; }
 
.result-item{
  margin-bottom:15px;
  padding:18px 20px;
  border-radius:var(--radius-m);
  border:1px solid var(--border-color);
}
.result-item.correct{ background:var(--success-bg); border-color:#BEE0C6; }
.result-item.incorrect{ background:var(--danger-bg); border-color:#F1C7C2; }
.result-item h4{ font-size:14.5px; margin-bottom:8px; color:var(--text-dark); }
.result-item p{ margin:0 0 6px; font-size:14px; }
.explanation-box{
  margin-top:10px;
  padding:10px 14px;
  background:rgba(255,255,255,.6);
  border-radius:var(--radius-s);
  font-size:13.5px !important;
  color:var(--text-muted) !important;
}
 
hr{ border:none; border-top:1px solid var(--border-color); margin:26px 0; }
 
/* ---------- 12. THỐNG KÊ HỌC TẬP TỔNG QUAN ---------- */
.dashboard-dark{
  background:linear-gradient(135deg, var(--matcha-deep) 0%, var(--matcha-deep-2) 100%);
  color:var(--white);
  padding:34px clamp(20px,4vw,40px);
  border-radius:var(--radius-l);
  margin-bottom:28px;
  position:relative;
  overflow:hidden;
}
.dashboard-dark::after{
  content:"";
  position:absolute; right:-60px; bottom:-80px;
  width:260px; height:260px;
  border-radius:50%;
  background:rgba(255,255,255,.05);
}
.dash-title{
  color:var(--white);
  font-size:22px;
  margin-bottom:22px;
  position:relative;
  z-index:1;
}
.stats-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit, minmax(180px,1fr));
  gap:16px;
  position:relative;
  z-index:1;
}
.stat-card{
  background:rgba(255,255,255,.1);
  border:1px solid rgba(255,255,255,.16);
  backdrop-filter:blur(6px);
  padding:20px 22px;
  border-radius:var(--radius-m);
}
.stat-desc{
  font-size:12.5px;
  color:rgba(255,255,255,.72);
  text-transform:uppercase;
  letter-spacing:.04em;
  margin-bottom:8px;
}
.stat-value{ font-size:27px; font-weight:800; }
.text-blue{ color:#8FC1F2; }
.text-orange{ color:#F2B673; }
 
.detailed-results-container{ display:flex; flex-direction:column; gap:12px; }
.detailed-results-container .result-item{
  transition:transform .15s ease, box-shadow .15s ease;
}
.detailed-results-container .result-item:hover{
  transform:translateY(-2px);
  box-shadow:var(--shadow-soft);
}
 
.panel-card.wide{ max-width:1280px; }
 
.history-panel{
  background:var(--white);
  padding:30px clamp(18px,3vw,34px);
  border-radius:var(--radius-l);
  border:1px solid var(--border-color);
}
.history-panel h3{ margin-bottom:20px; font-size:17px; }
 
/* ---------- 13. FOOTER ---------- */
.site-footer{
  margin-top:40px;
  padding:26px 0;
  background:var(--matcha-deep);
  color:rgba(255,255,255,.75);
  text-align:center;
  font-size:13.5px;
}
.site-footer strong{ color:var(--white); }
 
/* ---------- 14. RESPONSIVE CHUNG ---------- */
@media (max-width:640px){
  .panel-card{ padding:26px 18px; margin:18px auto 32px; border-radius:var(--radius-m); }
  .grid{ grid-template-columns:repeat(auto-fill, minmax(210px,1fr)); }
  .stats-grid{ grid-template-columns:1fr 1fr; }
  .result-hero{ flex-direction:column; align-items:flex-start; }
}