*{box-sizing:border-box}
body{margin:0;font-family:Cairo,sans-serif;background:#f5f8ff;color:#122033}
button,input{font:inherit}
.hidden{display:none!important}
.shell{max-width:1380px;margin:0 auto;padding:20px}
.card{background:#fff;border:1px solid #e6eefb;border-radius:24px;box-shadow:0 14px 30px rgba(18,32,51,.06)}
.padded-card{padding:18px}
.topbar{display:flex;gap:16px;align-items:center;justify-content:space-between;padding:16px 20px;position:sticky;top:10px;z-index:50}
.brand{display:flex;gap:12px;align-items:center}.brand h1{margin:0;font-size:20px}.brand p{margin:0;color:#63708a;font-size:13px}
.logo{width:50px;height:50px;border-radius:18px;background:linear-gradient(135deg,#4f8ef7,#8fc4ff);display:grid;place-items:center;color:#fff;font-weight:800}
.nav{display:flex;gap:8px;flex-wrap:wrap}
.nav-btn,.tab,.chip-btn,.ghost,.primary,.pill,.session-chip,.upload-box{border:0;border-radius:999px;padding:10px 14px}
.nav-btn,.tab,.chip-btn,.ghost,.upload-box{background:#edf3ff;color:#365077;cursor:pointer}
.nav-btn.active,.tab.active,.chip-btn.active,.primary{background:#4f8ef7;color:#fff}.primary,.ghost{cursor:pointer}
.ghost.danger{background:#fff2f3;color:#b42318}.session-wrap{display:flex;gap:10px;align-items:center}.session-chip{background:#f3f7ff;color:#365077}
.main-content{margin-top:18px}.page{display:none}.page.active{display:block}
.hero{display:flex;justify-content:space-between;gap:24px;padding:28px}.gradient{background:linear-gradient(135deg,#4f8ef7,#8fc4ff 58%,#d6eeff);color:#fff}.chip{display:inline-flex;background:rgba(255,255,255,.18);padding:6px 12px;border-radius:999px;font-size:13px}
.hero h2{font-size:34px;line-height:1.25;margin:10px 0}.hero-copy p{max-width:720px}
.row,.badge-row,.tab-row,.group,.stack-actions,.studio-stats,.stats-strip,.meta-line,.card-top,.actions-row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.hero-stats{display:grid;grid-template-columns:repeat(2,minmax(120px,1fr));gap:12px;min-width:280px}
.stat-box{background:#fff;color:#122033;border-radius:18px;padding:16px;text-align:center}.stat-box strong{display:block;color:#4f8ef7;font-size:28px}
.grid{display:grid;gap:16px;margin-top:18px}.grid.one{grid-template-columns:1fr}.grid.two{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}.grid.three{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}.inner-grid{margin-top:0}
.section-head{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:14px}.section-head h2,.section-head h3{margin:0}
.feature-card,.auth-wrap,.filters-card,.side-card,.studio-table-card{padding:18px}.feature-list{margin:0;padding-right:18px;display:grid;gap:8px}.demo-list p{margin:8px 0}.muted{color:#5f6d86}
.panels .panel{display:none}.panels .panel.active{display:grid;gap:12px}.stack-form{display:grid;gap:12px}
input.search,.stack-form input,.panel input{width:100%;padding:12px;border:1px solid #cad6ea;border-radius:14px;background:#fff}.full{width:100%}
.message-box{margin-top:12px;display:none;padding:12px;border-radius:14px}.message-box.show{display:block}.message-box.success{background:#ecfdf3;color:#027948;border:1px solid #9de2be}.message-box.error{background:#fff1f2;color:#b42318;border:1px solid #f4b6bf}
.pill{background:#f3f7ff;color:#365077}.checkbox-inline{display:flex;gap:10px;align-items:center;color:#365077}
.activity-card{padding:18px;display:grid;gap:10px}.type-badge,.difficulty-badge,.completed-badge,.badge-pill{display:inline-flex;align-items:center;justify-content:center;border-radius:999px;padding:6px 10px;font-size:13px}.type-badge{background:#eef5ff;color:#4f8ef7}.difficulty-badge{background:#fff8da;color:#8d6a00}.completed-badge{background:#ecfdf3;color:#027948}.activity-card.is-completed{border:1px solid #9de2be}.meta-line{justify-content:space-between;color:#5f6d86;font-size:13px}
.modal{position:fixed;inset:0;z-index:100}.overlay{position:absolute;inset:0;background:rgba(18,32,51,.6)}.modal-card{position:relative;max-width:860px;margin:4vh auto;z-index:2;max-height:92vh;overflow:auto;padding:20px}.close-btn{position:absolute;left:14px;top:10px;border:0;background:transparent;font-size:32px;cursor:pointer}
.player-card{padding:18px;background:#f8fbff;border:1px solid #e6eefb;border-radius:18px}.progress-line{font-size:13px;color:#5b6b82;margin-bottom:8px}
.options-wrap,.mission-list,.leaderboard-list,.recent-list,.path-totals,.studio-table,.table-wrap{display:grid;gap:10px}
.option,.mission-item,.leader-item,.child-card,.path-total-item{display:flex;gap:10px;background:#fff;border:1px solid #e6eefb;padding:12px;border-radius:16px;align-items:flex-start}
.fact-box{background:#fff;border:1px dashed #d6deee;padding:16px;border-radius:16px}
.flashcard{border-radius:22px;border:1px solid #dce9fb;overflow:hidden;background:linear-gradient(135deg,#fff,#edf7ff)}.flash-face{min-height:180px;display:grid;place-items:center;padding:20px;font-size:28px;font-weight:800;text-align:center}.flashcard .back{display:none}.flashcard.flipped .front{display:none}.flashcard.flipped .back{display:grid;background:#fffdf3}
.badge-pill{background:#f3f8ff;border:1px solid #dce9fb}.path-total-item{justify-content:space-between}.progress-bar{height:10px;background:#e7effc;border-radius:999px;overflow:hidden}.progress-bar span{display:block;height:100%;background:linear-gradient(90deg,#4f8ef7,#10b981)}.child-card{display:grid;gap:10px}
.studio-stats .studio-stat{background:#f8fbff;border:1px solid #dce9fb;border-radius:16px;padding:14px;min-width:120px}.studio-stat strong{display:block;color:#4f8ef7;font-size:28px}.upload-box{display:flex;justify-content:center;align-items:center;width:100%;position:relative;overflow:hidden}.upload-box input{position:absolute;inset:0;opacity:0;cursor:pointer}.table-wrap{overflow:auto}.table-grid{display:grid;gap:10px}.table-row{display:grid;grid-template-columns:1.2fr .8fr .6fr .8fr .6fr;gap:12px;padding:12px;border:1px solid #e6eefb;border-radius:16px;align-items:center}.table-row.header{background:#f8fbff;font-weight:700}
@media(max-width:980px){.topbar,.hero{flex-direction:column;align-items:flex-start}.hero-stats{grid-template-columns:repeat(2,1fr);width:100%}.nav{width:100%}.table-row{grid-template-columns:1fr 1fr}}