/* ============================================================
   SG Maths Exam — shared landing/marketing design system
   Used by landing.html, parents.html, tutors.html so the
   marketing pages stay visually aligned. Loaded AFTER app.css.
   ============================================================ */
:root{
  /* base */
  --primary:#7c5cff;--primary-dark:#6741ff;--primary-light:#efeaff;
  --accent:#ff6b6b;--accent-dark:#f04e4e;--accent-light:#fff0f0;
  --success:#10b981;--success-light:#ecfdf5;--danger:#ef4444;--warning:#f59e0b;
  --text:#1e2a4a;--text-muted:#5b6680;--text-soft:#94a3b8;
  --border:#e8ecf5;--border-strong:#cbd5e1;
  --bg:#ffffff;--bg-soft:#f4f7ff;--card:#ffffff;
  /* playful KooBits-style palette */
  --kb-yellow:#ffd23f;--kb-coral:#ff6b6b;--kb-teal:#2dd4bf;--kb-purple:#7c5cff;
  --kb-blue:#3b82f6;--kb-sky:#eef6ff;--kb-mint:#e9fbf5;--kb-cream:#fff8ec;--kb-lilac:#f3effe;
  --shadow-sm:0 2px 6px rgba(30,42,74,.06);
  --shadow:0 10px 30px -8px rgba(30,42,74,.14);
  --shadow-lg:0 28px 60px -18px rgba(30,42,74,.22);
  --radius:14px;--radius-lg:20px;--radius-xl:28px;
}
*{box-sizing:border-box;}html,body{margin:0;padding:0;}
body{font-family:'Nunito','Segoe UI',-apple-system,BlinkMacSystemFont,system-ui,sans-serif;font-size:16px;line-height:1.6;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;}
a{color:var(--primary);text-decoration:none;}a:hover{text-decoration:underline;}
img{max-width:100%;display:block;}button{font-family:inherit;cursor:pointer;}
h1,h2,h3,h4{line-height:1.15;margin:0 0 .5em;letter-spacing:-0.02em;font-weight:800;}
h1{font-size:3rem;font-weight:900;}
h2{font-size:2.3rem;font-weight:900;}h3{font-size:1.3rem;}
.container{max-width:1180px;margin:0 auto;padding:0 24px;}
.text-muted{color:var(--text-muted);}.text-center{text-align:center;}
.mt-24{margin-top:24px;}.mt-32{margin-top:32px;}.mb-24{margin-bottom:24px;}

/* nav */
.nav{background:rgba(255,255,255,.9);border-bottom:1px solid var(--border);padding:14px 0;position:sticky;top:0;z-index:50;backdrop-filter:saturate(150%) blur(8px);}
.nav-inner{display:flex;align-items:center;justify-content:space-between;}
.brand{display:flex;align-items:center;gap:10px;font-weight:900;font-size:1.18rem;color:var(--text);text-decoration:none;}
.brand-mark{width:34px;height:34px;border-radius:9px;display:block;flex:0 0 34px;}
.nav-links{display:flex;gap:6px;align-items:center;flex-wrap:wrap;}
.nav-links a{color:var(--text-muted);padding:8px 12px;border-radius:10px;font-weight:700;}
.nav-links a:hover{color:var(--text);background:var(--bg-soft);text-decoration:none;}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 24px;border-radius:999px;border:2px solid transparent;font-weight:800;font-size:.98rem;text-decoration:none;cursor:pointer;transition:all .15s;white-space:nowrap;}
.btn:hover{text-decoration:none;transform:translateY(-2px);}.btn:active{transform:translateY(0);}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 8px 20px rgba(255,107,107,.35);}
.btn-primary:hover{background:var(--accent-dark);color:#fff;}
.btn-purple{background:var(--primary);color:#fff;box-shadow:0 8px 20px rgba(124,92,255,.32);}
.btn-purple:hover{background:var(--primary-dark);color:#fff;}
.btn-ghost{background:#fff;color:var(--text);border-color:var(--border-strong);}
.btn-ghost:hover{background:var(--bg-soft);color:var(--text);}
.btn-light{background:rgba(255,255,255,.16);color:#fff;border-color:rgba(255,255,255,.4);}
.btn-light:hover{background:rgba(255,255,255,.26);color:#fff;}
.btn-lg{padding:17px 34px;font-size:1.08rem;}.btn-block{width:100%;}

/* kickers / badges */
.kicker{display:inline-flex;align-items:center;gap:8px;padding:8px 16px;border-radius:999px;background:var(--kb-yellow);color:#7a5c00;font-size:.85rem;font-weight:900;letter-spacing:.01em;}
.kicker.light{background:rgba(255,255,255,.18);color:#fff;border:1px solid rgba(255,255,255,.3);}

/* persona toggle */
.persona-switch{display:inline-flex;gap:12px;flex-wrap:wrap;justify-content:center;}
.persona-pill{display:inline-flex;align-items:center;gap:8px;padding:12px 26px;border-radius:999px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.4);color:#fff;font-weight:800;font-size:.95rem;text-decoration:none;cursor:pointer;transition:all .2s;backdrop-filter:blur(8px);}
.persona-pill span{transition:transform .2s;}
.persona-pill:hover{background:#fff;color:var(--primary);transform:translateY(-2px);box-shadow:0 6px 16px rgba(0,0,0,.18);}
.persona-pill:hover span{transform:translateX(3px);}
.persona-section{display:none;}.persona-section.active{display:block;}
.persona-section:not(.active) .hero-grid{display:none;}

/* hero */
.hero{background:radial-gradient(circle at 12% 18%,rgba(255,210,63,.32),transparent 32%),radial-gradient(circle at 88% 80%,rgba(45,212,191,.28),transparent 34%),linear-gradient(135deg,#7c5cff 0%,#5b7cff 48%,#3bb6f6 100%);color:#fff;padding:76px 0 92px;position:relative;overflow:hidden;}
.hero-inner{position:relative;}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(360px,.95fr);align-items:center;gap:44px;text-align:left;}
.hero-copy h1{color:#fff;font-size:3.3rem;max-width:760px;margin:0 0 16px;}
.hero-copy h1 .hl{color:var(--kb-yellow);}
.hero-copy p.lead{font-size:1.22rem;opacity:.96;max-width:600px;margin:0 0 26px;}
.hero-cta{display:flex;gap:14px;justify-content:flex-start;flex-wrap:wrap;margin-top:22px;}
.hero-note{opacity:.85;font-size:.92rem;margin-top:16px;}
.hero-stats{display:flex;gap:34px;justify-content:center;margin-top:54px;flex-wrap:wrap;}
.hero-stat{text-align:center;}
.hero-stat-num{font-size:2.3rem;font-weight:900;line-height:1;}
.hero-stat-label{opacity:.85;font-size:.9rem;margin-top:5px;}
.hero-game{position:relative;min-height:420px;}

/* battle preview (Tower Defence) */
.battle-preview{position:relative;overflow:hidden;border:1px solid rgba(255,255,255,.22);border-radius:22px;background:#d9f99d;box-shadow:0 28px 80px rgba(15,23,42,.32);min-height:420px;}
.battle-preview::before{content:'';position:absolute;inset:0;background:linear-gradient(160deg,rgba(255,255,255,.18),transparent 38%),linear-gradient(90deg,rgba(22,101,52,.13) 1px,transparent 1px),linear-gradient(0deg,rgba(22,101,52,.13) 1px,transparent 1px);background-size:auto,54px 54px,54px 54px;}
.battle-path{position:absolute;left:-8%;right:-8%;top:44%;height:82px;background:#fbbf24;border-top:10px solid rgba(146,64,14,.28);border-bottom:10px solid rgba(146,64,14,.28);transform:rotate(-6deg);box-shadow:0 8px 0 rgba(120,53,15,.12);}
.battle-path::after{content:'';position:absolute;inset:24px 0;border-top:4px dashed rgba(120,53,15,.38);}
.tower-token,.enemy-token{position:absolute;z-index:2;filter:drop-shadow(0 10px 12px rgba(15,23,42,.25));}
.tower-token img{width:74px;height:74px;object-fit:contain;}
.tower-token.arrow{left:12%;top:18%;}.tower-token.freeze{left:58%;top:15%;}.tower-token.laser{left:68%;bottom:13%;}.tower-token.cannon{left:26%;bottom:11%;}
.enemy-token{width:40px;height:40px;border-radius:50%;display:grid;place-items:center;background:#ef4444;color:white;font-weight:900;border:4px solid #fee2e2;}
.enemy-token.one{left:18%;top:48%;}.enemy-token.two{left:43%;top:40%;background:#7c3aed;}.enemy-token.three{right:18%;top:51%;background:#dc2626;width:54px;height:54px;}
.shot-line{position:absolute;z-index:1;height:4px;border-radius:999px;background:#60a5fa;box-shadow:0 0 18px #93c5fd;transform-origin:left center;}
.shot-line.one{width:145px;left:25%;top:30%;transform:rotate(23deg);}.shot-line.two{width:128px;left:64%;top:30%;transform:rotate(66deg);background:#22d3ee;}.shot-line.three{width:135px;left:39%;bottom:25%;transform:rotate(-25deg);background:#f97316;}
.battle-hud{position:absolute;left:18px;right:18px;top:16px;z-index:3;display:flex;gap:8px;flex-wrap:wrap;}
.battle-pill{background:rgba(255,255,255,.92);border:1px solid rgba(15,23,42,.12);border-radius:999px;color:#172033;font-size:.78rem;font-weight:900;padding:7px 10px;box-shadow:0 6px 16px rgba(15,23,42,.12);}
.battle-question{position:absolute;left:22px;right:22px;bottom:20px;z-index:3;background:rgba(255,255,255,.94);border:1px solid rgba(15,23,42,.12);border-radius:14px;color:#172033;padding:16px;box-shadow:0 18px 40px rgba(15,23,42,.18);}
.battle-question strong{display:block;font-size:.92rem;margin-bottom:4px;}.battle-question p{margin:0;color:#475569;font-size:.9rem;line-height:1.45;}
.battle-answer{display:flex;gap:8px;margin-top:12px;flex-wrap:wrap;}.battle-answer span{padding:6px 10px;border-radius:8px;background:#eef2ff;color:#263c8f;font-weight:900;font-size:.78rem;}
.battle-answer span.correct{background:#dcfce7;color:#166534;}

/* sample question card (parents/students hero) */
.sample-card{position:relative;background:#fff;border-radius:22px;border:1px solid var(--border);box-shadow:0 28px 80px rgba(15,23,42,.32);padding:24px;color:var(--text);text-align:left;max-width:430px;margin:0 auto;}
.sample-source{font-size:.78rem;font-weight:800;color:var(--text-soft);margin-bottom:12px;}
.sample-head{display:flex;align-items:center;gap:7px;flex-wrap:wrap;margin-bottom:14px;}
.sample-tag{font-size:.72rem;font-weight:900;padding:5px 11px;border-radius:999px;}
.sample-tag.paper{background:var(--primary-light);color:var(--primary-dark);}
.sample-tag.topic{background:var(--kb-mint);color:#0f766e;}
.sample-tag.marks{background:var(--kb-cream);color:#9a6b00;}
.sample-q{font-size:1.02rem;font-weight:700;line-height:1.5;margin:0 0 16px;color:var(--text);}
.sample-answer{display:flex;align-items:center;gap:10px;border:2px solid var(--success);background:var(--success-light);border-radius:12px;padding:12px 14px;margin-bottom:14px;}
.sample-answer .label{font-size:.78rem;font-weight:800;color:var(--text-muted);}
.sample-answer .val{font-weight:900;font-size:1.1rem;color:var(--text);}
.sample-answer .mark{margin-left:auto;display:inline-flex;align-items:center;gap:6px;color:var(--success);font-weight:900;font-size:.9rem;}
.sample-solution{background:var(--bg-soft);border-radius:12px;padding:14px 16px;border:1px solid var(--border);}
.sample-solution strong{display:block;font-size:.74rem;font-weight:900;color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:7px;}
.sample-solution p{margin:0;font-size:.9rem;color:var(--text-muted);line-height:1.6;}
.sample-badge{position:absolute;top:-14px;right:18px;background:var(--accent);color:#fff;font-weight:900;font-size:.76rem;padding:7px 14px;border-radius:999px;box-shadow:0 8px 20px rgba(255,107,107,.4);}

/* sections */
.section{padding:80px 0;}
.section-soft{background:var(--bg-soft);}
.section-cream{background:var(--kb-cream);}
.section-title{text-align:center;margin-bottom:14px;}
.section-sub{text-align:center;color:var(--text-muted);max-width:640px;margin:0 auto 52px;font-size:1.12rem;}

/* trust strip */
.trust{padding:30px 0;background:#fff;border-bottom:1px solid var(--border);}
.trust-line{text-align:center;color:var(--text-muted);font-weight:800;letter-spacing:.05em;text-transform:uppercase;font-size:.78rem;margin:0 0 16px;}
.schools-strip{display:flex;flex-wrap:wrap;justify-content:center;align-items:flex-start;gap:14px 22px;}
.school-pill{background:var(--kb-lilac);border:1px solid var(--border);padding:8px 16px;border-radius:999px;font-weight:800;font-size:.88rem;color:var(--primary-dark);}
.school-logo{display:flex;flex-direction:column;align-items:center;gap:7px;width:96px;text-align:center;}
.school-logo img{height:56px;width:auto;max-width:80px;object-fit:contain;filter:grayscale(.15);transition:filter .2s,transform .2s;}
.school-logo:hover img{filter:grayscale(0);transform:translateY(-2px);}
.school-logo .school-name{font-size:.72rem;font-weight:800;color:var(--text-muted);line-height:1.2;}
.school-logo img.is-broken{display:none;}
.school-logo.is-broken .school-name{background:var(--kb-lilac);border:1px solid var(--border);padding:8px 14px;border-radius:999px;color:var(--primary-dark);font-size:.85rem;}
.trust-disclaimer{text-align:center;color:var(--text-muted);font-size:.72rem;line-height:1.5;max-width:620px;margin:16px auto 0;}

/* how it works */
.hiw{display:flex;flex-direction:column;gap:40px;max-width:980px;margin:0 auto;}
.hiw-step{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;}
.hiw-step:nth-child(even) .hiw-art{order:-1;}
.hiw-num{display:inline-flex;align-items:center;justify-content:center;width:46px;height:46px;border-radius:14px;background:var(--primary);color:#fff;font-weight:900;font-size:1.25rem;margin-bottom:14px;box-shadow:0 8px 18px rgba(124,92,255,.3);}
.hiw-step:nth-child(2) .hiw-num{background:var(--kb-teal);box-shadow:0 8px 18px rgba(45,212,191,.32);}
.hiw-step:nth-child(3) .hiw-num{background:var(--accent);box-shadow:0 8px 18px rgba(255,107,107,.32);}
.hiw-step h3{font-size:1.55rem;margin-bottom:8px;}
.hiw-step p{color:var(--text-muted);font-size:1.05rem;margin:0;}
.hiw-art{border-radius:var(--radius-xl);min-height:240px;display:grid;place-items:center;font-size:4.5rem;box-shadow:var(--shadow);}
.hiw-art.a1{background:linear-gradient(140deg,#efeaff,#dce7ff);}
.hiw-art.a2{background:linear-gradient(140deg,#e9fbf5,#d7f6ee);}
.hiw-art.a3{background:linear-gradient(140deg,#fff0f0,#ffe3d6);}

/* feature grid (teacher) */
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
@media (max-width:768px){.feature-grid{grid-template-columns:1fr;}}
.feature{background:#fff;border:1px solid var(--border);border-radius:var(--radius-lg);padding:28px;transition:all .15s;box-shadow:var(--shadow-sm);}
.feature:hover{transform:translateY(-4px);box-shadow:var(--shadow);}
.feature-icon{width:52px;height:52px;border-radius:14px;background:var(--primary-light);color:var(--primary);display:grid;place-items:center;font-size:1.6rem;margin-bottom:16px;}
.feature-icon.accent{background:var(--accent-light);color:var(--accent);}
.feature-icon.success{background:var(--success-light);color:var(--success);}

/* game showcase */
.game-showcase{background:#101a33;color:white;overflow:hidden;position:relative;}
.game-showcase::before{content:'';position:absolute;inset:0;background:radial-gradient(circle at 82% 18%,rgba(255,107,107,.22),transparent 26%),radial-gradient(circle at 16% 72%,rgba(45,212,191,.22),transparent 28%);}
.game-showcase .container{position:relative;}
.game-grid{display:grid;grid-template-columns:minmax(0,.9fr) minmax(360px,1.1fr);gap:38px;align-items:center;}
.game-copy h2{color:white;font-size:2.35rem;}.game-copy p{color:#cbd5e1;font-size:1.08rem;max-width:560px;}
.game-list{display:grid;gap:12px;margin:26px 0 30px;}
.game-list-item{display:flex;gap:12px;align-items:flex-start;color:#e2e8f0;}
.game-list-icon{width:30px;height:30px;border-radius:9px;background:var(--accent);color:white;display:grid;place-items:center;font-weight:900;flex-shrink:0;}
.game-panel{position:relative;border:1px solid rgba(255,255,255,.14);border-radius:20px;background:rgba(255,255,255,.08);padding:18px;box-shadow:0 24px 70px rgba(0,0,0,.28);}
.game-panel .battle-preview{min-height:360px;border-radius:14px;box-shadow:none;}
.game-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:12px;}
.game-card{border:1px solid rgba(255,255,255,.16);background:rgba(255,255,255,.08);border-radius:10px;padding:12px;color:white;}
.game-card strong{display:block;font-size:.9rem;}.game-card span{display:block;color:#cbd5e1;font-size:.78rem;margin-top:3px;}
.game-card img{width:44px;height:44px;object-fit:contain;margin-bottom:8px;filter:drop-shadow(0 7px 8px rgba(0,0,0,.24));}

/* pricing */
.pricing-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;max-width:820px;margin:0 auto;}
@media (max-width:768px){.pricing-grid{grid-template-columns:1fr;}}
.price-card{background:#fff;border:2px solid var(--border);border-radius:var(--radius-lg);padding:34px;box-shadow:var(--shadow-sm);}
.price-card.featured{border-color:var(--primary);box-shadow:0 0 0 4px rgba(124,92,255,.1);position:relative;}
.price-card.featured::before{content:'MOST POPULAR';position:absolute;top:-13px;left:50%;transform:translateX(-50%);background:var(--primary);color:white;padding:5px 14px;border-radius:999px;font-size:.7rem;font-weight:900;letter-spacing:.05em;}
.price-amount{font-size:2.6rem;font-weight:900;}.price-period{color:var(--text-muted);}
.price-features{list-style:none;padding:0;margin:22px 0;}
.price-features li{padding:8px 0;display:flex;gap:8px;align-items:flex-start;}
.check{color:var(--success);font-weight:900;}

/* 4-up step grid (tutors) */
.steps-4{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;}
@media (max-width:900px){.steps-4{grid-template-columns:repeat(2,1fr);}}
@media (max-width:560px){.steps-4{grid-template-columns:1fr;}}

/* FAQ (marketing pages) */
.faq{max-width:720px;margin:0 auto;}
.faq details{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:16px 20px;margin-bottom:12px;box-shadow:var(--shadow-sm);}
.faq summary{font-weight:800;cursor:pointer;color:var(--text);list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px;}
.faq summary::-webkit-details-marker{display:none;}
.faq summary::after{content:'+';color:var(--primary);font-weight:900;font-size:1.3rem;line-height:1;}
.faq details[open] summary::after{content:'−';}
.faq details p{color:var(--text-muted);margin:12px 0 0;line-height:1.6;}

/* CTA band */
.cta-band{background:radial-gradient(circle at 15% 20%,rgba(255,210,63,.3),transparent 34%),linear-gradient(135deg,var(--primary),#3bb6f6);border-radius:var(--radius-xl);padding:60px 40px;text-align:center;color:white;}
.cta-band h2{color:white;font-size:2.4rem;}
.cta-band p{font-size:1.15rem;opacity:.95;max-width:560px;margin:0 auto 26px;}

/* footer */
footer{background:#101a33;color:#cbd5e1;padding:54px 0 36px;margin-top:0;text-align:center;}
footer .brand{color:white;justify-content:center;margin-bottom:16px;}
footer a{color:#cbd5e1;margin:0 12px;}

/* level modal */
.level-modal-overlay{display:none;position:fixed;inset:0;z-index:2000;background:rgba(15,23,42,.65);backdrop-filter:blur(4px);align-items:center;justify-content:center;}
.level-modal-overlay.open{display:flex;}
.level-modal-box{background:white;border-radius:24px;padding:44px 40px 32px;max-width:420px;width:90%;text-align:center;box-shadow:0 30px 70px rgba(15,23,42,.28);animation:modal-in .18s ease;}
@keyframes modal-in{from{opacity:0;transform:translateY(16px) scale(.97);}to{opacity:1;transform:none;}}
.level-btn{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;height:88px;border-radius:14px;border:2px solid transparent;cursor:pointer;transition:all .15s;font-family:inherit;}
.level-btn-p5{background:var(--primary-light);color:var(--primary);border-color:var(--primary);}
.level-btn-p5:hover{background:var(--primary);color:white;}
.level-btn-p6{background:var(--accent-light);color:var(--accent);border-color:var(--accent);}
.level-btn-p6:hover{background:var(--accent);color:white;}

@media (max-width:900px){
  .hero-grid,.game-grid{grid-template-columns:1fr;text-align:center;}
  .hero-copy h1,.hero-copy p.lead{margin-left:auto;margin-right:auto;}
  .hero-cta{justify-content:center;}.hero-game{min-height:360px;}.battle-preview{min-height:360px;}
  .game-list{text-align:left;}
  .hiw-step{grid-template-columns:1fr;gap:18px;text-align:center;}
  .hiw-step:nth-child(even) .hiw-art{order:0;}
  .hiw-num{margin-left:auto;margin-right:auto;}
}
@media (max-width:560px){
  .container{padding:0 16px;}.nav{padding:10px 0;}.brand{white-space:nowrap;font-size:1rem;}
  .nav-links{gap:4px;justify-content:flex-end;}.nav-links a{padding:7px 9px;font-size:.9rem;}
  .nav-links a[href="#tower-defence"]{display:none;}
  .hero{padding:44px 0 56px;}.hero-copy h1{font-size:2.2rem;}.hero-copy p.lead{font-size:1.05rem;}
  .hero-cta .btn{width:100%;max-width:300px;}.hero-game{min-height:300px;}.battle-preview{min-height:300px;}
  .tower-token img{width:52px;height:52px;}.game-cards{grid-template-columns:1fr;}
  h2{font-size:1.8rem;}.cta-band{padding:40px 24px;}
}