/* ============================================================
   DESIGN TOKENS
   ============================================================ */
:root{
  --charcoal-950:#14161b;
  --charcoal-900:#1b1e24;
  --charcoal-800:#252832;
  --charcoal-700:#31353f;
  --charcoal-600:#3d4250;
  --steel-400:#8b8f99;
  --steel-300:#aeb2bb;
  --brass-500:#c9a34f;
  --brass-400:#dab86a;
  --brass-300:#e8cd8e;
  --ivory-100:#f1ede3;
  --danger-500:#c0453a;
  --success-500:#4c9a5c;
  --station-blue:#3b7dc4;
  --station-red:#c0453a;
  --station-yellow:#d4a52a;
  --station-green:#4c9a5c;
  --station-purple:#8a5aa6;
  --station-teal:#2f9e8f;
  --font-display:'Rajdhani',-apple-system,'Segoe UI',sans-serif;
  --font-body:'Inter',-apple-system,'Segoe UI',sans-serif;
  --radius-sm:8px;
  --radius-md:14px;
  --radius-lg:22px;
  --shadow-soft:0 10px 30px rgba(0,0,0,.35);
  --shadow-deep:0 20px 50px rgba(0,0,0,.5);
}
@font-face{font-family:'Rajdhani';src:local('Rajdhani');}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent;user-select:none;}
html,body{margin:0;padding:0;width:100%;height:100%;overflow:hidden;background:var(--charcoal-950);
  font-family:var(--font-body);color:var(--ivory-100);overscroll-behavior:none;touch-action:none;}
#app{position:fixed;inset:0;width:100%;height:100%;}
canvas#three-canvas{position:absolute;inset:0;width:100%;height:100%;display:block;touch-action:none;}

/* ---------- generic screen / modal chrome ---------- */
.screen{position:fixed;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;
  background:radial-gradient(120% 120% at 50% 0%,#22262f 0%,#14161b 70%);z-index:10;transition:opacity .5s ease;}
.hidden{display:none !important;}
.fading-out{opacity:0;pointer-events:none;}

.title-lockup{text-align:center;margin-bottom:40px;position:relative;z-index:1;}
.logo-mark{display:flex;justify-content:center;margin-bottom:2px;filter:drop-shadow(0 8px 16px rgba(0,0,0,.45));
  animation:logoFloat 3.4s ease-in-out infinite;}
.logo-mark svg{width:132px;height:auto;}
@keyframes logoFloat{0%,100%{transform:translateY(0);}50%{transform:translateY(-6px);}}
.logo-smoke{transform-box:fill-box;transform-origin:center;opacity:0;animation:logoSmoke 2.4s ease-out infinite;}
.logo-smoke.s1{animation-delay:0s;}
.logo-smoke.s2{animation-delay:.5s;}
.logo-smoke.s3{animation-delay:1s;}
@keyframes logoSmoke{0%{opacity:0;transform:translateY(4px) scale(.4);}
  30%{opacity:.9;}70%{opacity:.5;}100%{opacity:0;transform:translateY(-16px) scale(1.15);}}
.title-lockup .brand{font-family:var(--font-display);font-weight:700;font-size:clamp(46px,10vw,84px);
  letter-spacing:3px;margin:0;line-height:.92;
  color:#f6efdd;
  text-shadow:
    0 1px 0 #c9c0a6, 0 2px 0 #b3aa8e,
    0 3px 0 #9d947a, 0 4px 0 #877e66,
    0 6px 8px rgba(0,0,0,.55);}
.title-lockup .brand span{
  color:#f0b93f;
  background:linear-gradient(180deg,#ffe7a0,#f0b93f 55%,#c98a1f);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
  text-shadow:none;
  filter:drop-shadow(0 2px 0 #8a5f16) drop-shadow(0 4px 0 #6e4a10) drop-shadow(0 6px 7px rgba(0,0,0,.5));}
.title-lockup .sub{display:flex;align-items:center;justify-content:center;gap:12px;
  font-family:var(--font-display);font-weight:600;letter-spacing:5px;font-size:clamp(11px,2.3vw,15px);
  text-transform:uppercase;color:#e9dfc5;margin-top:12px;text-shadow:0 1px 0 #7a7256,0 2px 3px rgba(0,0,0,.5);}
.title-lockup .sub::before,.title-lockup .sub::after{content:"";height:3px;width:clamp(28px,8vw,64px);border-radius:3px;
  background:linear-gradient(90deg,transparent,var(--brass-400));}
.title-lockup .sub::after{background:linear-gradient(90deg,var(--brass-400),transparent);}
.rail-divider{width:120px;height:3px;margin:18px auto 0;background:linear-gradient(90deg,transparent,var(--brass-500),transparent);}
.menu-screen{overflow:hidden;}
.menu-rail-glow{position:absolute;top:-10%;left:50%;transform:translateX(-50%);width:900px;height:900px;
  background:radial-gradient(circle,rgba(201,163,79,.16) 0%,rgba(201,163,79,0) 62%);pointer-events:none;z-index:0;}
.menu-track-strip{position:absolute;left:0;right:0;bottom:0;height:64px;pointer-events:none;z-index:0;
  background:
    repeating-linear-gradient(90deg,#4a3c2a 0 10px,transparent 10px 46px) bottom 14px / 100% 8px,
    linear-gradient(180deg,transparent,rgba(0,0,0,.35));
  opacity:.55;}
.menu-track-strip::before{content:"";position:absolute;left:0;right:0;bottom:20px;height:3px;background:#8a8f94;box-shadow:0 24px 0 #8a8f94;}
.title-lockup, .menu-stack{animation:menuFadeIn .7s ease both;}
.menu-stack{animation-delay:.12s;}
@keyframes menuFadeIn{from{opacity:0;transform:translateY(14px);}to{opacity:1;transform:translateY(0);}}

/* ---------- premium 3D buttons ---------- */
.btn{font-family:var(--font-display);font-weight:700;letter-spacing:2.5px;text-transform:uppercase;
  font-size:15px;color:var(--ivory-100);cursor:pointer;position:relative;overflow:hidden;isolation:isolate;
  border:none;border-radius:var(--radius-md);padding:17px 36px;min-width:236px;
  background:linear-gradient(180deg,#3a4150 0%,#2a2f3b 55%,#20242e 100%);
  box-shadow:
    inset 0 1.5px 0 rgba(255,255,255,.22),
    inset 0 -2px 3px rgba(0,0,0,.45),
    0 7px 0 #10131a,
    0 12px 22px rgba(0,0,0,.5);
  transition:transform .11s cubic-bezier(.34,1.56,.64,1), box-shadow .11s ease, filter .2s ease;
  text-shadow:0 1px 0 rgba(0,0,0,.4);}
.btn::before{content:"";position:absolute;inset:1px 1px 45% 1px;border-radius:var(--radius-md) var(--radius-md) 40% 40%;
  background:linear-gradient(180deg,rgba(255,255,255,.28),rgba(255,255,255,0));pointer-events:none;z-index:-1;}
.btn::after{content:"";position:absolute;top:0;left:-140%;width:55%;height:100%;pointer-events:none;z-index:1;
  background:linear-gradient(105deg,transparent,rgba(255,255,255,.5),transparent);transform:skewX(-20deg);}
.btn:hover{transform:translateY(-1px);filter:brightness(1.06);}
.btn:hover::after{animation:btnShine .85s ease;}
@keyframes btnShine{0%{left:-140%;}100%{left:160%;}}
.btn:active{transform:translateY(6px);
  box-shadow:inset 0 1.5px 0 rgba(255,255,255,.16),inset 0 -1px 2px rgba(0,0,0,.4),0 1px 0 #10131a,0 4px 10px rgba(0,0,0,.4);}
.btn.primary{color:#3a2a06;
  background:linear-gradient(180deg,#ffeaa6 0%,#f2c250 48%,#d99a2c 100%);
  box-shadow:
    inset 0 1.5px 0 rgba(255,255,255,.7),
    inset 0 -2px 4px rgba(140,95,20,.55),
    0 7px 0 #916417,
    0 12px 26px rgba(214,164,66,.4);
  text-shadow:0 1px 0 rgba(255,255,255,.35);}
.btn.primary:active{box-shadow:inset 0 1.5px 0 rgba(255,255,255,.5),inset 0 -1px 2px rgba(140,95,20,.5),0 1px 0 #916417,0 4px 12px rgba(214,164,66,.35);}
.btn.primary::before{background:linear-gradient(180deg,rgba(255,255,255,.6),rgba(255,255,255,0));}
.btn.primary.pulse{animation:btnPulse 2.2s ease-in-out infinite;}
@keyframes btnPulse{0%,100%{box-shadow:inset 0 1.5px 0 rgba(255,255,255,.7),inset 0 -2px 4px rgba(140,95,20,.55),0 7px 0 #916417,0 12px 26px rgba(214,164,66,.4);}
  50%{box-shadow:inset 0 1.5px 0 rgba(255,255,255,.8),inset 0 -2px 4px rgba(140,95,20,.55),0 7px 0 #916417,0 12px 34px rgba(255,196,80,.75);}}
.btn.ghost{color:var(--ivory-100);
  background:linear-gradient(180deg,rgba(58,66,82,.55),rgba(28,32,40,.65));
  box-shadow:inset 0 1px 0 rgba(255,255,255,.14),inset 0 0 0 1px rgba(255,255,255,.08),0 5px 0 rgba(8,10,14,.8),0 9px 18px rgba(0,0,0,.4);}
.btn.ghost::before{background:linear-gradient(180deg,rgba(255,255,255,.14),rgba(255,255,255,0));}
.btn.ghost:active{transform:translateY(4px);box-shadow:inset 0 1px 0 rgba(255,255,255,.1),inset 0 0 0 1px rgba(255,255,255,.06),0 1px 0 rgba(8,10,14,.8),0 4px 9px rgba(0,0,0,.4);}
.btn.small{padding:13px 24px;font-size:12.5px;min-width:0;border-radius:var(--radius-sm);}
.btn-row{display:flex;gap:16px;flex-wrap:wrap;justify-content:center;}
.menu-stack{display:flex;flex-direction:column;gap:15px;align-items:center;}

/* ---------- loading screen ---------- */
#loading-screen .loading-bar-track{width:220px;height:4px;border-radius:4px;background:var(--charcoal-700);
  overflow:hidden;margin-top:30px;}
#loading-screen .loading-bar-fill{width:0%;height:100%;background:linear-gradient(90deg,var(--brass-400),var(--brass-500));
  border-radius:4px;transition:width .25s linear;}
#loading-screen .loading-label{margin-top:12px;font-size:11px;letter-spacing:3px;color:var(--steel-400);text-transform:uppercase;}

/* ---------- level select (paginated, no scrollbar) ---------- */
#level-select{justify-content:flex-start;padding:min(6vh,54px) 0 22px;}
.ls-header{display:flex;align-items:center;justify-content:space-between;width:min(92vw,760px);margin-bottom:18px;}
.ls-header h2{font-family:var(--font-display);letter-spacing:3px;font-size:22px;margin:0;text-transform:uppercase;
  text-shadow:0 2px 6px rgba(0,0,0,.5);}
.ls-grid{width:min(92vw,760px);display:grid;grid-template-columns:repeat(5,1fr);grid-auto-rows:1fr;
  gap:14px;padding:6px 4px;overflow:visible;}
@media(max-width:520px){.ls-grid{grid-template-columns:repeat(4,1fr);gap:11px;}}
.level-card{position:relative;aspect-ratio:1/1;border-radius:14px;overflow:hidden;isolation:isolate;
  background:linear-gradient(165deg,#3a4150,#232833 70%,#1b1f28);
  border:1px solid rgba(255,255,255,.09);display:flex;flex-direction:column;align-items:center;justify-content:center;
  cursor:pointer;transition:transform .13s cubic-bezier(.34,1.56,.64,1),box-shadow .13s ease,filter .2s ease;
  box-shadow:inset 0 1.5px 0 rgba(255,255,255,.16),inset 0 -3px 5px rgba(0,0,0,.4),0 6px 0 #10131a,0 10px 18px rgba(0,0,0,.45);}
.level-card::before{content:"";position:absolute;inset:1px 1px 55% 1px;border-radius:13px 13px 40% 40%;
  background:linear-gradient(180deg,rgba(255,255,255,.2),rgba(255,255,255,0));pointer-events:none;z-index:0;}
.level-card>*{position:relative;z-index:1;}
.level-card:hover{transform:translateY(-2px);filter:brightness(1.08);}
.level-card:active{transform:translateY(4px);box-shadow:inset 0 1.5px 0 rgba(255,255,255,.12),0 1px 0 #10131a,0 4px 10px rgba(0,0,0,.4);}
.level-card.done{background:linear-gradient(165deg,#4a3f22,#2c2413 72%,#221b0e);border-color:rgba(240,197,90,.4);
  box-shadow:inset 0 1.5px 0 rgba(255,230,160,.4),inset 0 -3px 5px rgba(0,0,0,.4),0 6px 0 #6e4a10,0 10px 20px rgba(180,130,40,.35);}
.level-card .num{font-family:var(--font-display);font-weight:700;font-size:30px;color:#f4ecd6;text-shadow:0 2px 3px rgba(0,0,0,.5);}
.level-card.done .num{color:#ffe9a8;text-shadow:0 1px 0 #7a5410,0 2px 4px rgba(0,0,0,.4);}
.level-card .stars{display:flex;gap:3px;margin-top:7px;}
.level-card .stars .star-ico{width:13px;height:13px;}
.level-card.locked{cursor:default;background:linear-gradient(165deg,#2a2e37,#1d2129 70%,#171a20);
  border-color:rgba(255,255,255,.05);box-shadow:inset 0 1px 0 rgba(255,255,255,.06),0 4px 0 #0d0f14,0 7px 12px rgba(0,0,0,.4);}
.level-card.locked::before{opacity:.4;}
.level-card.locked:hover{transform:none;filter:none;}
.level-card.locked:active{transform:none;}
.level-card .lock-ico{width:30px;height:30px;filter:drop-shadow(0 2px 3px rgba(0,0,0,.5));opacity:.85;}
.level-card.locked .num{display:none;}
/* pagination footer */
.ls-nav{display:flex;align-items:center;justify-content:center;gap:22px;margin-top:20px;width:min(92vw,760px);}
.ls-page-ind{font-family:var(--font-display);font-weight:700;letter-spacing:2px;font-size:14px;color:var(--steel-300);
  min-width:96px;text-align:center;text-shadow:0 1px 2px rgba(0,0,0,.5);}
.nav-btn{width:52px;height:52px;border:none;border-radius:50%;cursor:pointer;position:relative;overflow:hidden;
  display:flex;align-items:center;justify-content:center;color:#3a2a06;
  background:linear-gradient(180deg,#ffeaa6 0%,#f2c250 48%,#d99a2c 100%);
  box-shadow:inset 0 1.5px 0 rgba(255,255,255,.7),inset 0 -2px 4px rgba(140,95,20,.5),0 5px 0 #916417,0 9px 16px rgba(214,164,66,.4);
  transition:transform .11s cubic-bezier(.34,1.56,.64,1),box-shadow .11s ease,filter .2s ease;}
.nav-btn svg{width:22px;height:22px;}
.nav-btn:hover{filter:brightness(1.07);transform:translateY(-1px);}
.nav-btn:active{transform:translateY(5px);box-shadow:inset 0 1.5px 0 rgba(255,255,255,.5),0 1px 0 #916417,0 4px 10px rgba(214,164,66,.35);}
.nav-btn:disabled{background:linear-gradient(180deg,#454b57,#2c313b);color:#6b7280;cursor:not-allowed;
  box-shadow:inset 0 1px 0 rgba(255,255,255,.08),0 4px 0 #10131a,0 7px 12px rgba(0,0,0,.4);filter:none;transform:none;}

/* ---------- game HUD ---------- */
#game-screen{position:fixed;inset:0;z-index:5;pointer-events:none;}
#hud-top{position:fixed;top:0;left:0;right:0;display:flex;justify-content:space-between;align-items:flex-start;
  padding:calc(14px + env(safe-area-inset-top)) 16px 0;pointer-events:none;z-index:6;}
.hud-pill{pointer-events:auto;background:rgba(20,22,27,.72);backdrop-filter:blur(6px);border:1px solid rgba(255,255,255,.08);
  border-radius:var(--radius-sm);padding:9px 16px;display:flex;flex-direction:column;align-items:center;min-width:64px;}
.hud-pill .label{font-size:9px;letter-spacing:1.5px;color:var(--steel-400);text-transform:uppercase;}
.hud-pill .value{font-family:var(--font-display);font-weight:700;font-size:19px;line-height:1.2;}
#hud-objective{position:fixed;top:calc(78px + env(safe-area-inset-top));left:50%;transform:translateX(-50%);
  pointer-events:none;background:rgba(20,22,27,.6);border:1px solid rgba(255,255,255,.08);border-radius:20px;
  padding:6px 18px;font-size:12px;letter-spacing:.5px;color:var(--steel-300);z-index:6;text-align:center;max-width:80vw;}
#pause-btn{pointer-events:auto;width:42px;height:42px;border-radius:50%;background:rgba(20,22,27,.72);
  border:1px solid rgba(255,255,255,.1);display:flex;align-items:center;justify-content:center;font-family:var(--font-display);
  font-weight:700;font-size:15px;color:var(--ivory-100);cursor:pointer;letter-spacing:1px;}
#hud-hint{position:fixed;bottom:calc(18px + env(safe-area-inset-bottom));left:50%;transform:translateX(-50%);
  background:rgba(20,22,27,.62);border:1px solid rgba(255,255,255,.08);border-radius:20px;padding:8px 18px;
  font-size:11.5px;letter-spacing:.4px;color:var(--steel-300);z-index:6;pointer-events:none;text-align:center;max-width:88vw;}

/* ---------- modals ---------- */
.modal-backdrop{position:fixed;inset:0;background:rgba(10,11,14,.68);backdrop-filter:blur(3px);z-index:20;
  display:flex;align-items:center;justify-content:center;}
.modal-panel{width:min(90vw,380px);background:linear-gradient(165deg,var(--charcoal-800),var(--charcoal-900));
  border:1px solid rgba(255,255,255,.07);border-radius:var(--radius-lg);padding:32px 28px 26px;box-shadow:var(--shadow-deep);
  text-align:center;}
.modal-panel h3{font-family:var(--font-display);letter-spacing:3px;font-size:24px;margin:0 0 6px;text-transform:uppercase;}
.modal-panel .sub-line{font-size:13px;color:var(--steel-300);margin-bottom:20px;}
.stars-row{display:flex;justify-content:center;gap:10px;margin:18px 0;}
.stars-row svg{width:38px;height:38px;opacity:.25;transform:scale(.6);transition:opacity .35s ease,transform .35s ease;}
.stars-row svg.lit{opacity:1;transform:scale(1);}
.stat-line{display:flex;justify-content:space-between;font-size:13px;color:var(--steel-300);padding:6px 4px;
  border-bottom:1px solid rgba(255,255,255,.06);}
.stat-line b{color:var(--ivory-100);font-family:var(--font-display);font-size:15px;}
.modal-panel .btn-row{margin-top:22px;}
.modal-panel.fail h3{color:var(--danger-500);}

/* ---------- settings ---------- */
.settings-row{display:flex;align-items:center;justify-content:space-between;padding:12px 2px;
  border-bottom:1px solid rgba(255,255,255,.06);}
.settings-row .lbl{font-size:13px;letter-spacing:.5px;color:var(--steel-300);}
.seg-toggle{display:flex;background:var(--charcoal-700);border-radius:10px;padding:3px;gap:2px;}
.seg-toggle button{border:none;background:transparent;color:var(--steel-400);font-family:var(--font-display);
  font-size:11px;letter-spacing:1px;padding:7px 12px;border-radius:8px;cursor:pointer;}
.seg-toggle button.active{background:var(--brass-500);color:#241b0a;font-weight:700;}

/* ---------- tutorial overlay ---------- */
#tutorial-overlay{position:fixed;inset:0;z-index:15;pointer-events:none;}
.tut-bubble{position:absolute;pointer-events:auto;background:rgba(20,22,27,.9);border:1px solid var(--brass-500);
  border-radius:var(--radius-md);padding:12px 16px;max-width:240px;font-size:12.5px;line-height:1.4;color:var(--ivory-100);
  box-shadow:var(--shadow-soft);opacity:0;transition:opacity .35s ease, transform .35s ease;transform:translateY(6px);}
.tut-bubble.show{opacity:1;transform:translateY(0);}
.tut-bubble .step-tag{display:block;font-family:var(--font-display);color:var(--brass-400);letter-spacing:2px;
  font-size:10px;margin-bottom:4px;text-transform:uppercase;}

/* misc */
.icon-btn{background:linear-gradient(180deg,rgba(58,66,82,.6),rgba(28,32,40,.7));border:1px solid rgba(255,255,255,.1);
  color:var(--ivory-100);cursor:pointer;padding:9px 16px;border-radius:10px;font-family:var(--font-display);
  font-weight:600;letter-spacing:1.5px;font-size:12px;text-transform:uppercase;
  box-shadow:inset 0 1px 0 rgba(255,255,255,.12),0 4px 0 rgba(8,10,14,.8),0 7px 12px rgba(0,0,0,.4);
  transition:transform .11s ease,filter .2s ease;}
.icon-btn:hover{filter:brightness(1.1);}
.icon-btn:active{transform:translateY(3px);box-shadow:inset 0 1px 0 rgba(255,255,255,.1),0 1px 0 rgba(8,10,14,.8);}
/* shared icon defs + states */
.svg-defs{position:absolute;width:0;height:0;overflow:hidden;}
.star-ico path{fill:url(#gStarGrey);}
.star-ico.lit path,.stars-row svg.lit path{fill:url(#gStarGold);}
.star-ico.lit,.level-card .stars .star-ico.lit{filter:drop-shadow(0 1px 2px rgba(190,140,30,.6));}
::-webkit-scrollbar{width:0;height:0;}
::-webkit-scrollbar-thumb{background:transparent;}

/* ============================================================
   MOBILE RESPONSIVE  (phones & small tablets)
   ============================================================ */
@media (max-width:820px){
  .btn{padding:15px 28px;min-width:200px;font-size:14px;letter-spacing:2px;}
  .btn.small{padding:11px 20px;font-size:12px;}
  .hud-pill{padding:7px 12px;min-width:56px;}
  .hud-pill .value{font-size:17px;}
  .modal-panel{width:min(92vw,360px);padding:22px 20px;}
  .ls-grid{width:min(94vw,680px);gap:12px;}
}
@media (max-width:560px){
  .btn{padding:14px 22px;min-width:170px;font-size:13px;}
  #hud-top{padding:8px 10px calc(8px + env(safe-area-inset-top));}
  .hud-pill{padding:6px 10px;min-width:48px;border-radius:10px;}
  .hud-pill .label{font-size:8px;}
  .hud-pill .value{font-size:15px;}
  #hud-objective{font-size:11px;padding:5px 12px;top:calc(66px + env(safe-area-inset-top));}
  #hud-hint{font-size:10.5px;}
  .ls-header h2{font-size:18px;}
  .level-card .num{font-size:24px;}
  .level-card .stars .star-ico{width:11px;height:11px;}
  .nav-btn{width:44px;height:44px;}
  .modal-panel h3{font-size:20px;}
  .modal-panel{padding:20px 16px;}
}
/* short landscape phones: shrink the title lockup so menu buttons stay visible */
@media (max-height:480px) and (orientation:landscape){
  .title-lockup{transform:scale(.72);transform-origin:top center;margin-bottom:-14px;}
  .btn{padding:11px 24px;}
  .menu-actions{gap:9px;}
}
/* comfortable min tap-target for all interactive chips */
@media (pointer:coarse){
  .icon-btn,.nav-btn,.seg-toggle button{min-width:44px;min-height:44px;}
  .switch-tap-safe{touch-action:manipulation;}
}