/* VnDoc Tank English – lightweight UI refinement V8.
   Visual-only override of V7. Keep real controls, Canvas, touch dock and game logic.
*/
:root{
  --light-ink:#173d55;
  --light-muted:#628091;
  --light-border:rgba(112,169,193,.23);
  --light-shadow:0 6px 22px rgba(13,51,76,.10);
  --light-card:rgba(255,255,253,.96);
  --light-blue:#1686c8;
  --light-green:#13a887;
}
body{color:var(--light-ink);background:#cfeff4}
body::before{filter:saturate(.8) brightness(1.08);opacity:.85}
body::after{background:linear-gradient(180deg,rgba(234,248,255,.16),rgba(216,242,248,.21) 46%,rgba(22,74,89,.14));opacity:1}
main{max-width:1500px;padding-top:16px}
.top{
  min-height:62px;padding:8px clamp(12px,2.6vw,42px);gap:12px;
  background:rgba(10,49,78,.86);
  border:0;border-bottom:1px solid rgba(226,250,255,.24);
  box-shadow:0 2px 10px rgba(12,43,63,.13);
  backdrop-filter:blur(15px)
}
.top .brand{gap:8px}
.top .brand-icon,.top .brand-icon img{width:42px;height:44px}
.top .brand strong{
  font-size:clamp(18px,1.7vw,23px);font-weight:900;letter-spacing:-.5px;
  color:#ffe4a1;text-shadow:none
}
.top .brand small{font-size:11px;color:#dcebf3}
.top nav{gap:3px}
.top nav a,.top nav button,.top .game-help summary{
  min-height:38px;padding:7px 10px;
  background:transparent;color:#e8f7ff;
  border:1px solid transparent;border-radius:10px;
  box-shadow:none;font-weight:700;font-size:12px;
  transition:background .15s ease,color .15s ease
}
.top nav #nav-grades{color:#ffedb2}
.top nav a:hover,.top nav button:hover,.top .game-help summary:hover{
  background:rgba(225,247,255,.13);border-color:transparent
}
.top .game-help-content{
  background:rgba(255,255,255,.98);border:1px solid var(--light-border);
  box-shadow:var(--light-shadow);border-radius:12px;color:var(--light-ink)
}
body[data-screen="home"] #nav-home{display:none}
body[data-screen="units"] #nav-grades{display:none}
#view-home .hero{
  border:1px solid rgba(243,253,255,.55);border-radius:22px;min-height:312px;
  padding:clamp(20px,3vw,42px);
  background:linear-gradient(90deg,rgba(14,57,86,.74),rgba(24,102,136,.38) 72%,rgba(33,134,136,.16)),url('/assets/canva-game-world.svg') center 56%/cover;
  box-shadow:0 10px 28px rgba(11,50,77,.16)
}
#view-home .hero::before{background:linear-gradient(90deg,rgba(8,40,65,.13),transparent 70%)}
#view-home .hero h1{
  font-size:clamp(34px,4.4vw,64px);font-weight:900;letter-spacing:-1.4px;
  line-height:1.13;text-shadow:0 3px 12px rgba(6,37,61,.25);margin-bottom:13px
}
#view-home .hero h1 span{color:#adf9db;text-shadow:0 3px 10px rgba(3,45,55,.22)}
#view-home .hero .hero-kicker{letter-spacing:1px;text-shadow:none}
#view-home .hero p{font-size:clamp(14px,1.15vw,17px);max-width:590px}
#view-home .hero-mascot{filter:drop-shadow(0 8px 8px rgba(7,38,52,.23))}
#view-home .panel,#view-learning .panel,#view-results .panel{
  background:rgba(251,254,255,.96);border:1px solid var(--light-border);
  border-radius:20px;box-shadow:var(--light-shadow)
}
#view-home .panel h2{font-size:clamp(22px,2.1vw,28px);margin-bottom:12px}
#view-home #grades{gap:10px}
#view-home #grades .grade{
  min-height:100px;padding:14px;border:1px solid #d1e7ed;border-radius:13px;
  background:rgba(255,255,255,.92);
  box-shadow:0 3px 10px rgba(16,81,96,.06);transition:transform .15s,background .15s,box-shadow .15s
}
#view-home #grades .grade:hover{
  background:#f0fcf9;border-color:#78cdbb;transform:translateY(-2px);
  box-shadow:0 7px 16px rgba(13,98,101,.11)
}
#view-home #grades .grade::before{font-size:20px}
#view-home #grades .grade strong{font-size:19px;font-weight:850}
#view-units>.back{color:#efffff;font-size:14px;text-shadow:0 1px 6px rgba(4,35,51,.4);margin-bottom:9px}
#view-units .selection-layout{gap:13px;grid-template-columns:minmax(200px,243px) minmax(0,1fr)}
#view-units .grade-sidebar{
  padding:11px;background:rgba(13,49,75,.87);border:1px solid rgba(177,222,239,.37);
  border-radius:16px;box-shadow:0 8px 24px rgba(7,36,59,.18);top:80px;
  backdrop-filter:blur(13px)
}
#view-units .grade-sidebar h2{
  margin:0 0 10px;padding:5px 7px;color:#f9e7b9;font-size:17px;
  border:none;border-radius:0;background:none;text-shadow:none;letter-spacing:0
}
#view-units .grade-menu{gap:5px}
#view-units .grade-menu button{
  min-height:47px;gap:9px;padding:6px 10px;background:rgba(236,250,255,.07);
  border:1px solid transparent;border-radius:10px;box-shadow:none;
  color:#eaf5f9;transition:background .14s,transform .14s
}
#view-units .grade-menu button::before{
  width:28px;height:28px;flex-shrink:0;font-size:17px;color:#f8d97c;
  border:0;border-radius:9px;background:rgba(255,255,255,.1);text-shadow:none
}
#view-units .grade-menu button strong{font-size:15px;font-weight:800}
#view-units .grade-menu button small{font-size:10px;color:#c5dce8}
#view-units .grade-menu button:hover{background:rgba(236,250,255,.16);transform:none}
#view-units .grade-menu button[aria-current="true"]{
  background:linear-gradient(100deg,#ffe7a0,#ffcf74);color:#574110;
  border:1px solid rgba(255,240,186,.75);box-shadow:0 3px 10px rgba(33,35,24,.13)
}
#view-units .grade-menu button[aria-current="true"]::before{
  background:rgba(255,255,255,.48);border:0;color:#d79528
}
#view-units .grade-menu button[aria-current="true"] small{color:#82622a}
#view-units .grade-panel{
  padding:clamp(13px,2vw,23px);border:1px solid rgba(220,247,255,.54);
  border-radius:19px;box-shadow:0 10px 30px rgba(7,44,70,.20);
  background:linear-gradient(125deg,rgba(12,59,94,.75),rgba(18,81,112,.66)),url('/assets/canva-game-world.svg') center/cover;
  backdrop-filter:blur(8px)
}
#view-units .grade-heading{gap:12px;margin-bottom:14px}
#view-units .grade-heading h2{
  color:#fff5ca;font-weight:900;letter-spacing:-.6px;
  font-size:clamp(25px,2.7vw,39px);text-shadow:0 2px 8px rgba(5,35,55,.3);margin:0 0 8px
}
#view-units .grade-heading .muted{
  border:0;border-radius:9px;background:rgba(8,39,61,.37);
  padding:7px 10px;font-weight:600;font-size:12px;color:#effbff
}
#view-units .grade-summary{
  min-width:185px;padding:12px;border:1px solid rgba(211,242,250,.20);
  border-radius:12px;background:rgba(7,43,70,.55);
  box-shadow:none;font-size:12px
}
#view-units .grade-summary strong{color:#e8f6fa;font-size:12px;font-weight:800}
#view-units .grade-summary .progressbar{height:7px;border:0}
#view-units #unit-list{gap:11px}
#view-units #unit-list .unit{
  min-height:220px;border:1px solid #e5eeea;border-radius:14px;
  background:rgba(255,255,251,.97);box-shadow:0 4px 14px rgba(6,38,55,.13);
  transition:transform .15s,box-shadow .15s
}
#view-units #unit-list .unit:hover,#view-units #unit-list .unit:focus-visible{
  transform:translateY(-2px);border-color:#a5dbd4;
  box-shadow:0 9px 18px rgba(6,38,55,.18)
}
#view-units #unit-list .unit-art{height:94px;min-height:94px;border:0}
#view-units #unit-list .unit-art .unit-glyph{
  font-size:clamp(32px,3.6vw,52px);filter:drop-shadow(0 3px 3px rgba(23,61,74,.2));text-shadow:none
}
#view-units #unit-list .unit-body{padding:10px;gap:4px}
#view-units #unit-list .unit strong{font-size:clamp(15px,1.3vw,18px);font-weight:850;color:#153e53}
#view-units #unit-list .unit small{color:var(--light-muted)}
#view-units #unit-list .stage-stars{font-size:15px;letter-spacing:1px}
#view-units #unit-list .progressbar{height:4px;margin:3px 0}
#view-units #unit-list .unit-cta{
  padding:9px 7px;color:white;font-size:12px;font-weight:800;
  border:0;border-radius:9px;background:#258edd;box-shadow:none;
  transition:background .15s
}
#view-units #unit-list .unit:hover .unit-cta{background:#147ac0}
#view-units #unit-list .unit-complete .unit-cta{background:#19a77a}
#view-units .unit-pager button{
  min-height:40px;min-width:42px;padding:8px 12px;border:1px solid rgba(227,252,255,.28);
  border-radius:11px;box-shadow:none;background:rgba(10,59,91,.66);color:#fff
}
#view-units .selection-footer{margin-top:15px}
#view-units #quick-join{
  min-height:44px;padding:11px 18px;font-size:14px;font-weight:850;
  border:0;border-radius:11px;background:linear-gradient(120deg,#ffe293,#ffcb66);
  box-shadow:0 4px 12px rgba(40,50,30,.18);color:#584018
}
#view-learning .difficulty-row{padding:16px;background:#f0f8fb;border:1px solid var(--light-border);border-radius:13px}
#view-learning .difficulty-cards{gap:11px}
#view-learning .difficulty-card,#view-learning .difficulty-card[data-difficulty]{
  padding:16px;border:1px solid #d6e5e9;border-radius:13px;
  box-shadow:0 3px 10px rgba(12,73,100,.06);
  background:#fff;transition:background .15s,transform .15s
}
#view-learning .difficulty-card:hover{transform:translateY(-1px)}
#view-learning .difficulty-card[aria-pressed="true"]{
  outline:none;border:2px solid #57bcae;
  box-shadow:0 4px 13px rgba(12,107,113,.12);background:#edfbf7
}
#view-learning .difficulty-card .mode-title{font-size:20px}
#view-learning .difficulty-card .mode-speed{box-shadow:none;background:#ebf6fa;border-radius:8px}
#view-learning .difficulty-card[aria-pressed="true"] .mode-speed{background:#c9f3e7}
#view-learning .voice-setting,#view-learning .flashcard{
  border:1px solid var(--light-border);border-radius:12px;box-shadow:none;background:#fff
}
#view-learning .button,.results .button{
  border-radius:11px;box-shadow:none;font-weight:800
}
#view-game .battle{background:rgba(248,254,255,.97);border:1px solid rgba(207,236,246,.9);border-radius:16px;box-shadow:var(--light-shadow)}
#view-game .mission-card{border:1px solid rgba(209,242,251,.28);border-radius:16px;box-shadow:var(--light-shadow)}
#view-game .energy-card{border:1px solid #e0eaf0;background:#f5fbfd;border-radius:10px;box-shadow:none}
#view-game .energy-bar{height:11px}
#view-game #arena{border:1px solid #b8e2e3;border-radius:13px;box-shadow:none}
#view-game .mascot-coach{background:#fff9e9;border:1px solid #f1e4be;border-radius:11px;box-shadow:none}
#view-game .word-slots .slot{border-radius:7px;border:1px solid #deedf0;border-bottom:3px solid #4d9bbd;box-shadow:none}
#view-game .controls .button{border-radius:10px;box-shadow:none}
#view-game .power-section{border:1px solid #d4e7e8;background:#f0fbfa;border-radius:13px;box-shadow:none}
#view-game .power-button{
  border:1px solid #c8e0e3;border-bottom:2px solid #a5cacf;
  border-radius:10px;background:#fff;box-shadow:none;font-weight:800
}
#view-game .keyboard>.key{
  border:1px solid #b7d7e2;border-bottom:3px solid #94bac8;
  border-radius:9px;background:#f9fdff;box-shadow:none;color:#15516e
}
#view-game .feedback{border-radius:9px}
#view-game .scores>span{box-shadow:none;border:1px solid rgba(198,237,249,.24);background:rgba(12,57,84,.52)}
#view-game .mobile-quick-toggle{border-radius:9px;border:1px solid rgba(184,220,236,.32);background:#194e6a}
#view-results .stat,#view-results .local-leaderboard{border:1px solid #dbe9ed;border-radius:12px;box-shadow:none;background:#f7fbfb}
footer{box-shadow:none}
@media(max-width:1040px){
 .top nav{gap:3px}
 .top nav a,.top nav button,.top .game-help summary{min-height:35px;padding:6px 9px}
 #view-units .selection-layout{grid-template-columns:195px minmax(0,1fr)}
}
@media(max-width:780px){
 .top{min-height:unset;gap:5px;padding:8px 10px}
 .top .brand-icon,.top .brand-icon img{width:35px;height:38px}
 .top .brand strong{font-size:18px}
 .top nav{gap:3px}
 .top nav a,.top nav button,.top .game-help summary{font-size:11px;min-height:35px;padding:6px 9px}
 #view-units .selection-layout{grid-template-columns:minmax(0,1fr);gap:10px}
 #view-units .grade-sidebar{padding:9px;border-radius:12px}
 #view-units .grade-sidebar h2{font-size:15px;margin:0 0 6px;padding:4px}
 #view-units .grade-menu{gap:6px}
 #view-units .grade-menu button{min-height:43px;min-width:94px;padding:5px 7px;border-radius:8px}
 #view-units .grade-menu button::before{width:24px;height:24px;font-size:15px}
 #view-units .grade-menu button strong{font-size:13px}
 #view-units .grade-panel{padding:12px;border-radius:14px}
 #view-units .grade-heading h2{font-size:clamp(26px,5vw,34px)}
 #view-units #unit-list .unit-art{height:78px;min-height:78px}
 #view-units #unit-list .unit{min-height:202px;border-radius:11px}
 #view-units #unit-list .unit strong{font-size:15px}
 #view-learning .difficulty-card{padding:12px}
}
@media(max-width:560px){
 #view-home .hero{min-height:260px;border-radius:17px;padding:20px}
 #view-home .hero h1{font-size:clamp(32px,8vw,43px)}
 #view-home .panel{padding:14px;border-radius:15px}
 #view-home #grades{gap:8px}
 #view-home #grades .grade{min-height:84px;padding:9px;border-radius:11px}
 #view-units #unit-list{gap:8px}
 #view-units #unit-list .unit{min-height:198px}
 #view-units #unit-list .unit-body{padding:8px}
 #view-units #unit-list .stage-stars{font-size:14px}
 #view-units #unit-list .unit-cta{padding:8px 4px}
 #view-game .battle{padding:5px;border-radius:11px}
 #view-game .mission-card{border-radius:8px;box-shadow:none}
 #view-game .power-section{border:1px solid #b4ddd9;border-top:1px solid #87c7c0;border-radius:11px 11px 0 0;background:#effcf9f8;box-shadow:0 -2px 10px rgba(13,54,67,.12)}
 #view-game .keyboard{background:#eef8fd;border-top:1px solid #bedce8;box-shadow:0 -2px 10px rgba(13,54,67,.12)}
 #view-game .keyboard>.key{border:1px solid #bad6e0;border-bottom:3px solid #a6c3ce;border-radius:7px;background:#fff}
 #view-game .power-button{border:1px solid #c3dfe2;border-bottom:2px solid #aecbd0;border-radius:8px}
}
@media(prefers-reduced-motion:reduce){
 #view-home #grades .grade,#view-units #unit-list .unit,#view-learning .difficulty-card{transition:none}
}