/* ===== Azota Hub — Material 3 Expressive (vàng), mobile-first ===== */
:root{
  --primary:#F5B301;--primary-hover:#E0A200;--primary-container:#FFF3C4;--on-primary:#3D2E00;
  --accent:#FFD966;--surface:#FFFCF5;--surface-1:#FFFFFF;--surface-2:#FFF8E7;
  --on-surface:#2B2410;--on-surface-2:#6B5D2E;--outline:#E8DCB0;--success:#7CB342;--error:#D32F2F;
  --glass:rgba(255,252,245,.72);--shadow:0 4px 20px rgba(120,90,0,.10);--shadow-lg:0 14px 36px rgba(120,90,0,.20);
  --spring:cubic-bezier(.34,1.56,.64,1);
  --f-display:"Plus Jakarta Sans",system-ui,sans-serif;--f-body:"Be Vietnam Pro",system-ui,sans-serif;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--primary:#FFD54F;--primary-hover:#FFCA28;--primary-container:#4A3B00;--on-primary:#2B2000;--surface:#1A1600;--surface-1:#241E00;--surface-2:#2E2700;--on-surface:#FFF8E1;--on-surface-2:#D4C68A;--outline:#4A4020;--glass:rgba(26,22,0,.72);--shadow:0 4px 20px rgba(0,0,0,.4);--shadow-lg:0 14px 36px rgba(0,0,0,.55)}}
:root[data-theme="dark"]{--primary:#FFD54F;--primary-hover:#FFCA28;--primary-container:#4A3B00;--on-primary:#2B2000;--surface:#1A1600;--surface-1:#241E00;--surface-2:#2E2700;--on-surface:#FFF8E1;--on-surface-2:#D4C68A;--outline:#4A4020;--glass:rgba(26,22,0,.72);--shadow:0 4px 20px rgba(0,0,0,.4);--shadow-lg:0 14px 36px rgba(0,0,0,.55)}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font:400 .9rem/1.6 var(--f-body);color:var(--on-surface);overflow-x:hidden;min-height:100vh;
  background:radial-gradient(circle at 0 0,color-mix(in srgb,var(--accent) 35%,transparent),transparent 45%),
             radial-gradient(circle at 100% 100%,color-mix(in srgb,var(--accent) 28%,transparent),transparent 45%),var(--surface);
  background-attachment:fixed;transition:background-color .3s,color .3s}
img{max-width:100%;height:auto;object-fit:cover}
a{color:inherit}
h1,h2,h3{font-family:var(--f-display);font-weight:800;line-height:1.25;margin:0}
:focus-visible{outline:3px solid var(--primary);outline-offset:2px}

/* Header kính mờ */
.app-header{position:sticky;top:0;z-index:50;display:flex;align-items:center;justify-content:space-between;gap:8px;
  padding:10px 16px;padding-top:max(10px,env(safe-area-inset-top));
  background:var(--glass);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:1px solid var(--outline)}
.brand{display:flex;align-items:center;gap:8px;text-decoration:none;font:800 1.05rem var(--f-display);color:var(--on-surface)}
.brand i{color:var(--primary)}
.header-actions{display:flex;align-items:center;gap:8px}
.hide-sm{display:none}

.container{max-width:1280px;margin:0 auto;padding:16px;padding-bottom:max(32px,env(safe-area-inset-bottom))}
.container.narrow{max-width:460px;padding-top:32px}

/* Nút */
.btn,.icon-btn{position:relative;overflow:hidden;display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;border:0;border-radius:999px;font:600 .9rem var(--f-body);cursor:pointer;text-decoration:none;
  transition:transform .3s var(--spring),box-shadow .3s,background .2s;-webkit-tap-highlight-color:transparent}
.btn{padding:0 18px}
.icon-btn{width:44px;background:var(--surface-2);color:var(--on-surface)}
.btn-filled{background:var(--primary);color:var(--on-primary)}
.btn-tonal{background:var(--primary-container);color:var(--on-surface)}
.btn-text{background:transparent;color:var(--on-surface-2)}
.btn-danger{background:transparent;color:var(--error);border:1px solid color-mix(in srgb,var(--error) 40%,transparent)}
.btn.block{width:100%}
.btn:active,.icon-btn:active,.card:active{transform:scale(.96)}
.spin{animation:spin .6s var(--spring)}
@keyframes spin{to{transform:rotate(360deg)}}
.ripple-dot{position:absolute;border-radius:50%;background:currentColor;opacity:.25;transform:scale(0);animation:rip .6s ease-out forwards;pointer-events:none}
@keyframes rip{to{transform:scale(2.4);opacity:0}}

/* Hero */
.hero{position:relative;overflow:hidden;text-align:center;border-radius:28px;padding:32px 20px;margin-bottom:24px;
  background:linear-gradient(135deg,var(--primary-container),var(--surface-2));border:1px solid var(--outline)}
.hero>*{position:relative}
.hero-title{font-size:clamp(1.6rem,5vw,3rem);font-weight:800;letter-spacing:-.02em;
  background:linear-gradient(90deg,#E0A200,#F5B301 50%,#FFD966);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-sub{margin:8px 0 0;color:var(--on-surface-2);font-size:clamp(.9rem,2.5vw,1.1rem)}
.orb{display:none;position:absolute;border-radius:50%;background:var(--accent);opacity:.35;filter:blur(8px)}
.orb1{width:140px;height:140px;top:-40px;left:-30px}.orb2{width:100px;height:100px;bottom:-30px;right:-20px}

/* Grid thẻ bài */
.grid{display:grid;grid-template-columns:1fr;gap:12px}
.card{position:relative;display:flex;flex-direction:column;gap:12px;min-height:150px;padding:20px;border-radius:24px;
  background:var(--surface-1);border:1px solid var(--outline);box-shadow:var(--shadow);text-decoration:none;
  overflow-wrap:anywhere;word-wrap:break-word;transition:transform .35s var(--spring),box-shadow .3s}
.card::before{content:"";position:absolute;inset:0;border-radius:inherit;padding:2px;opacity:0;transition:opacity .3s;pointer-events:none;
  background:linear-gradient(135deg,#FFD966,#F5B301,#E0A200);
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude}
.badge{align-self:flex-start;padding:4px 12px;border-radius:999px;background:var(--primary);color:var(--on-primary);font:700 .78rem var(--f-display)}
.card-title{font-size:1.05rem;flex:1}
.card-meta{display:flex;align-items:center;gap:6px;color:var(--on-surface-2);font-size:.82rem}
.card-meta .go{margin-left:auto;color:var(--primary)}

/* Fade-in-up khi cuộn */
.reveal{opacity:0;transform:translateY(20px);transition:opacity .5s ease,transform .5s var(--spring)}
.reveal.in{opacity:1;transform:none}

/* Trạng thái rỗng */
.empty{text-align:center;padding:48px 20px;border:2px dashed var(--outline);border-radius:28px;color:var(--on-surface-2)}
.empty i{font-size:2.6rem;color:var(--primary);margin-bottom:12px}
.empty h2{color:var(--on-surface);font-size:1.2rem;margin-bottom:4px}.empty p{margin:0}
.empty.small{padding:24px}

/* Panel & form */
.panel{background:var(--surface-1);border:1px solid var(--outline);border-radius:28px;padding:20px;box-shadow:var(--shadow);margin-bottom:24px}
.panel-title{font-size:1.2rem;margin-bottom:16px}
.page-title{font-size:clamp(1.4rem,4vw,2rem);margin:8px 0 16px}
.section-title{font-size:1.1rem;margin:8px 0 12px}
.field{display:block;margin-bottom:14px}
.field span{display:block;margin-bottom:6px;font-weight:600;color:var(--on-surface-2)}
.field input{width:100%;min-height:48px;padding:0 16px;font:16px var(--f-body);color:var(--on-surface);
  background:var(--surface-2);border:2px solid var(--outline);border-radius:16px;transition:border-color .2s,box-shadow .2s}
.field input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 4px color-mix(in srgb,var(--primary) 25%,transparent)}
.alert{display:flex;gap:8px;align-items:flex-start;padding:12px 16px;border-radius:16px;margin-bottom:16px;font-weight:500}
.alert-ok{background:color-mix(in srgb,var(--success) 18%,var(--surface-1));color:var(--on-surface)}
.alert-ok i{color:var(--success)}
.alert-error{background:color-mix(in srgb,var(--error) 14%,var(--surface-1))}
.alert-error i{color:var(--error)}

/* Bảng: mobile = thẻ xếp chồng */
.table-wrap{max-width:100%}
table{width:100%;border-collapse:collapse}
table.stack thead{display:none}
table.stack tr{display:block;background:var(--surface-1);border:1px solid var(--outline);border-radius:20px;padding:12px 16px;margin-bottom:12px;box-shadow:var(--shadow)}
table.stack td{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:6px 0;text-align:right;overflow-wrap:anywhere}
table.stack td::before{content:attr(data-label);flex:none;font-weight:600;color:var(--on-surface-2);text-align:left}
table.stack td.actions{justify-content:flex-end;padding-top:10px}
table.stack td.actions::before{display:none}
td a{color:var(--on-surface-2)}

/* Mobile lớn */
@media (min-width:481px){.grid{grid-template-columns:repeat(2,1fr)}}
@media (min-width:481px){.hide-sm{display:inline}}
/* Tablet */
@media (min-width:768px){
  body{font-size:1rem}
  .container{padding:24px}
  .app-header{padding:12px 24px}
  .hero{padding:48px 32px}.orb{display:block}
  .grid{grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}
  .panel{padding:28px}
  .panel:not(.narrow .panel){max-width:640px}
  .container.narrow .panel{max-width:none}
}
/* Laptop */
@media (min-width:1024px){
  .container{padding:40px 24px}
  .app-header{padding:16px 32px}
  .grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}
  /* Bảng dạng thường */
  .table-wrap{overflow-x:auto;background:var(--surface-1);border:1px solid var(--outline);border-radius:24px;box-shadow:var(--shadow)}
  table.stack thead{display:table-header-group}
  table.stack tr{display:table-row;background:none;border:0;border-radius:0;padding:0;margin:0;box-shadow:none}
  table.stack th,table.stack td{display:table-cell;padding:14px 16px;text-align:left;border-bottom:1px solid var(--outline);vertical-align:middle}
  table.stack th{color:var(--on-surface-2);font-weight:600}
  table.stack td::before{display:none}
  table.stack td.wrap{max-width:320px}
  table.stack tr:last-child td{border-bottom:0}
}
/* Màn hình rộng */
@media (min-width:1440px){.grid{gap:24px}}

/* Hover chỉ trên thiết bị có chuột */
@media (hover:hover){
  .card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
  .card:hover::before{opacity:1}
  .btn:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
  .btn-filled:hover{background:var(--primary-hover)}
  .icon-btn:hover{background:var(--primary-container)}
}
/* Thiết bị cảm ứng: vùng chạm lớn hơn */
@media (hover:none){.btn,.icon-btn{min-height:48px}.icon-btn{width:48px}.header-actions{gap:10px}}

@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}.reveal{opacity:1;transform:none}}

/* ===== Thẻ cố định & danh sách tệp (Môn Nghề) ===== */
.card-pinned{background:linear-gradient(135deg,var(--primary-container),var(--surface-1));border-color:var(--primary)}
.file-list{list-style:none;margin:0;padding:0;display:grid;gap:12px}
.file-item{display:flex;flex-wrap:wrap;align-items:center;gap:12px;padding:16px;border-radius:24px;
  background:var(--surface-1);border:1px solid var(--outline);box-shadow:var(--shadow)}
.file-ico{font-size:1.8rem;color:var(--primary);flex:none}
.file-info{flex:1 1 160px;min-width:0;display:flex;flex-direction:column}
.file-name{overflow-wrap:anywhere;font-family:var(--f-display)}
.file-meta{color:var(--on-surface-2);font-size:.82rem}
.file-actions{display:flex;gap:8px;width:100%}
.file-actions form{margin:0}
.file-actions .btn-filled{flex:1}
input[type=file]{padding:10px 12px !important;height:auto !important}
@media (min-width:600px){.file-actions{width:auto}.file-actions .btn-filled{flex:none}}

/* Tiến trình tải lên */
.up-list{margin-top:16px;display:grid;gap:10px}
.up-row{padding:10px 14px;border-radius:16px;background:var(--surface-2);border:1px solid var(--outline)}
.up-top{display:flex;justify-content:space-between;gap:12px;font-size:.85rem;margin-bottom:6px}
.up-name{overflow-wrap:anywhere;font-weight:600}
.track{height:8px;border-radius:999px;background:var(--outline);overflow:hidden}
.bar{height:100%;width:0;background:var(--primary);border-radius:inherit;transition:width .25s}
.up-row.ok .bar{background:var(--success)}
.up-row.fail{border-color:var(--error)}.up-row.fail .st{color:var(--error)}