*{box-sizing:border-box;margin:0;padding:0}
body{font-family:'Segoe UI',sans-serif;background:#f5f7fa;color:#1a1a2e}
header{background:linear-gradient(135deg,#1a1a2e,#16213e);color:white;padding:16px 28px;display:flex;align-items:center;gap:14px}
header .logo{font-size:2.2rem;flex-shrink:0}
header h1{font-size:1.15rem;font-weight:700;line-height:1.3}
header .meta{font-size:.72rem;opacity:.6;margin-top:4px;letter-spacing:.3px}
.steps{display:flex;background:white;border-bottom:1px solid #e0e0e0;padding:0 16px;overflow-x:auto}
.step-item{padding:12px 14px;font-size:.78rem;color:#999;border-bottom:3px solid transparent;cursor:default;display:flex;align-items:center;gap:5px;white-space:nowrap}
.step-item.active{color:#4361ee;border-color:#4361ee;font-weight:600}
.step-item.done{color:#2ec4b6;border-color:#2ec4b6}
.step-num{width:19px;height:19px;border-radius:50%;background:#eee;color:#999;display:flex;align-items:center;justify-content:center;font-size:.68rem;font-weight:700;flex-shrink:0}
.step-item.active .step-num{background:#4361ee;color:white}
.step-item.done   .step-num{background:#2ec4b6;color:white}
.step-trial{cursor:pointer!important;color:#ef4444!important;border-bottom-color:#ef4444!important}
.step-trial .step-num{background:linear-gradient(135deg,#f59e0b,#ef4444)!important;color:white!important}
.step-trial:hover{background:#fff5f5}
.container{max-width:960px;margin:24px auto;padding:0 16px}
.card{background:white;border-radius:12px;box-shadow:0 2px 12px rgba(0,0,0,.07);padding:26px;margin-bottom:18px}
.card h2{font-size:1.05rem;font-weight:600;margin-bottom:18px;color:#16213e}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.form-group{display:flex;flex-direction:column;gap:5px}
.form-group.full{grid-column:1/-1}
label{font-size:.8rem;font-weight:500;color:#555}
input,select{padding:8px 11px;border:1px solid #ddd;border-radius:7px;font-size:.88rem;transition:border .2s;font-family:inherit;background:white}
input:focus,select:focus{outline:none;border-color:#4361ee;box-shadow:0 0 0 3px rgba(67,97,238,.1)}
.sec-label{font-size:.76rem;font-weight:600;color:#4361ee;text-transform:uppercase;letter-spacing:.8px;margin:18px 0 10px;padding-bottom:5px;border-bottom:1px solid #eef}
.btn{padding:9px 22px;border-radius:7px;font-size:.88rem;font-weight:600;cursor:pointer;border:none;transition:all .2s;font-family:inherit}
.btn-primary{background:#4361ee;color:white}
.btn-primary:hover{background:#3451d1;transform:translateY(-1px)}
.btn-secondary{background:#f0f0f0;color:#333}
.btn-secondary:hover{background:#e0e0e0}
.btn-success{background:#2ec4b6;color:white}
.btn-success:hover{background:#25a99d;transform:translateY(-1px)}
.btn-danger{background:#ff6b6b;color:white;font-size:.8rem;padding:6px 14px}
.btn-danger:hover{background:#e05555}
.btn-analyze{background:linear-gradient(135deg,#7c3aed,#4361ee);color:white;width:100%;padding:13px;font-size:.98rem}
.btn-analyze:hover{background:linear-gradient(135deg,#6d28d9,#3451d1);transform:translateY(-1px)}
.btn:disabled{opacity:.5;cursor:not-allowed;transform:none!important}
.btn-row{display:flex;gap:10px;justify-content:flex-end;margin-top:20px}
.metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:18px}
.metric{background:#f8f9ff;border:1px solid #e8ebff;border-radius:10px;padding:14px;text-align:center}
.metric-val{font-size:1.5rem;font-weight:700;color:#4361ee}
.metric-lbl{font-size:.76rem;color:#888;margin-top:3px}
#plot{width:100%;height:420px;border-radius:10px;overflow:hidden}
.log-box{background:#1a1a2e;color:#a8e6cf;border-radius:10px;padding:14px;font-family:monospace;font-size:.83rem;line-height:1.8;min-height:80px;max-height:200px;overflow-y:auto}
.progress-wrap{margin:14px 0}
.progress-bar-bg{background:#eee;border-radius:99px;height:7px;overflow:hidden}
.progress-bar{background:linear-gradient(90deg,#4361ee,#2ec4b6);height:100%;border-radius:99px;transition:width .4s ease;width:0%}
.progress-label{font-size:.78rem;color:#888;margin-top:5px}
.notice{background:#fff8e1;border:1px solid #ffe082;border-radius:10px;padding:14px 18px;display:flex;gap:10px;align-items:flex-start;margin-top:16px}
.hint-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:10px}
.hint-card{background:white;border:1px solid #ffe082;border-radius:8px;padding:12px;text-align:center}
.hint-card .icon{font-size:1.4rem;margin-bottom:5px}
.hint-card .title{font-size:.8rem;font-weight:600;color:#555;margin-bottom:3px}
.hint-card .desc{font-size:.76rem;color:#888;line-height:1.4}
.hint-card code{background:#f5f5f5;padding:1px 5px;border-radius:4px;font-size:.82rem}
.alert{padding:11px 15px;border-radius:8px;font-size:.86rem;margin-bottom:14px}
.alert-error{background:#fff0f0;border:1px solid #ffcdd2;color:#c62828}
.alert-info{background:#e8f4fd;border:1px solid #bee3f8;color:#2b6cb0}
.alert-success{background:#f0fff4;border:1px solid #c8e6c9;color:#1b5e20}
.hidden{display:none!important}
/* Product selection card */
.prod-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:8px 0 16px}
.prod-card{border:3px solid #e0e0e0;border-radius:16px;padding:36px 20px;text-align:center;cursor:pointer;transition:all .25s;position:relative;background:white}
.prod-card:hover{border-color:#4361ee;background:#f8f9ff;transform:translateY(-3px);box-shadow:0 8px 28px rgba(67,97,238,.18)}
.prod-card.selected{border-color:#4361ee;background:#eef0ff;box-shadow:0 4px 18px rgba(67,97,238,.22)}
.prod-check{position:absolute;top:14px;right:14px;width:26px;height:26px;border-radius:50%;background:#4361ee;color:white;display:flex;align-items:center;justify-content:center;font-size:.9rem;font-weight:700;opacity:0;transition:opacity .2s}
.prod-card.selected .prod-check{opacity:1}
.prod-icon{width:80px;height:80px;margin-bottom:14px;object-fit:contain;display:block;margin-left:auto;margin-right:auto}
.prod-name{font-size:1.2rem;font-weight:700;color:#16213e;margin-bottom:10px}
.prod-desc{font-size:.82rem;color:#666;line-height:1.75}
.prod-badge{display:inline-block;background:#e8ebff;color:#4361ee;border-radius:20px;padding:3px 12px;font-size:.74rem;font-weight:600;margin-top:10px}
/* Boundary conditions */
.support-types{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-bottom:14px}
.sup-card{border:2px solid #e0e0e0;border-radius:9px;padding:12px 8px;text-align:center;cursor:pointer;transition:all .2s}
.sup-card:hover{border-color:#4361ee;background:#f8f9ff}
.sup-card.selected{border-color:#4361ee;background:#eef0ff}
.sup-card .sicon{font-size:1.5rem;margin-bottom:5px}
.sup-card .sname{font-size:.8rem;font-weight:600;color:#333}
.sup-card .sdesc{font-size:.73rem;color:#888;margin-top:2px}
.dof-grid{display:flex;gap:8px;flex-wrap:wrap;margin-top:8px}
.dof-item{display:flex;align-items:center;gap:5px;background:#f8f9ff;border:1px solid #e0e8ff;border-radius:6px;padding:6px 10px;font-size:.82rem;cursor:pointer}
.dof-item input{width:15px;height:15px;cursor:pointer}
/* Load cases */
.lc-row{background:#f9faff;border:1px solid #e8ebff;border-radius:9px;padding:14px;margin-bottom:12px;position:relative}
.lc-row .lc-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}
.lc-badge{background:#4361ee;color:white;border-radius:5px;padding:2px 9px;font-size:.76rem;font-weight:600}
.tag-toggle{display:flex;gap:6px}
.tag{padding:5px 14px;border-radius:20px;font-size:.8rem;font-weight:500;cursor:pointer;border:1.5px solid #ddd;color:#666;background:white;transition:all .15s}
.tag.on{border-color:#4361ee;background:#4361ee;color:white}
.node-mode-tabs{display:flex;gap:8px;margin-bottom:12px}
.node-tab{padding:5px 14px;border-radius:6px;font-size:.8rem;cursor:pointer;border:1.5px solid #ddd;color:#666;background:white;transition:all .15s}
.node-tab.on{border-color:#4361ee;background:#f0f3ff;color:#4361ee;font-weight:600}
/* Analysis results */
.analysis-badge{display:inline-flex;align-items:center;gap:8px;padding:7px 16px;border-radius:20px;font-size:.84rem;font-weight:600;margin-bottom:16px}
.badge-wait{background:#f0f0f0;color:#888}
.badge-run{background:#fff3e0;color:#e65100}
.badge-done{background:#f0fff4;color:#1b5e20}
.badge-err{background:#fff0f0;color:#c62828}
.result-tabs{display:flex;gap:8px;margin-bottom:16px;flex-wrap:wrap}
.rtab{padding:7px 18px;border-radius:7px;font-size:.84rem;font-weight:600;cursor:pointer;border:1.5px solid #ddd;color:#666;background:white;transition:all .15s}
.rtab.on{border-color:#4361ee;background:#4361ee;color:white}
.stat-cards{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-bottom:16px}
.stat-card{background:#f8f9ff;border:1px solid #e8ebff;border-radius:10px;padding:12px;text-align:center}
.stat-val{font-size:1.15rem;font-weight:700;color:#4361ee;font-family:monospace}
.stat-lbl{font-size:.72rem;color:#888;margin-top:3px}
.result-chart{width:100%;border-radius:10px;overflow:hidden;margin-bottom:16px}
.result-table-wrap{max-height:340px;overflow:auto;border:1px solid #e8ebff;border-radius:8px;font-size:.8rem}
.result-table-wrap table{width:100%;border-collapse:collapse;min-width:700px}
.result-table-wrap th{background:#4361ee;color:white;padding:8px 10px;position:sticky;top:0;text-align:right;font-size:.76rem}
.result-table-wrap th:first-child,.result-table-wrap th:nth-child(2){text-align:left}
.result-table-wrap td{padding:6px 10px;border-bottom:1px solid #f0f0f0;text-align:right;font-family:monospace}
.result-table-wrap td:first-child,.result-table-wrap td:nth-child(2){text-align:left;font-family:inherit}
.result-table-wrap tr:hover td{background:#f8f9ff}
.result-table-wrap .hi-pos{color:#d32f2f;font-weight:700}
.result-table-wrap .hi-neg{color:#1565c0;font-weight:700}
.lc-select-row{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.lc-select-row label{font-size:.82rem;font-weight:600;color:#555;white-space:nowrap}
.lc-select-row select{flex:1;max-width:260px}
/* Free Trial button */
.btn-trial{background:linear-gradient(135deg,#f59e0b,#ef4444);color:white;padding:9px 22px}
.btn-trial:hover{background:linear-gradient(135deg,#d97706,#dc2626);transform:translateY(-1px)}
/* Step 9 Hero */
.trial-hero{background:linear-gradient(135deg,#1a1a2e 0%,#16213e 50%,#0f3460 100%);border-radius:16px;padding:52px 32px 44px;text-align:center;margin-bottom:20px;position:relative;overflow:hidden}
.trial-hero::before{content:'';position:absolute;inset:0;background:radial-gradient(circle at 70% 30%,rgba(67,97,238,.25) 0%,transparent 60%);pointer-events:none}
.trial-ball{font-size:4.5rem;margin-bottom:14px;animation:bounce 2s ease-in-out infinite}
@keyframes bounce{0%,100%{transform:translateY(0)}50%{transform:translateY(-12px)}}
.trial-headline{font-size:2rem;font-weight:800;color:white;line-height:1.25;margin-bottom:14px;letter-spacing:-.5px}
.trial-sub{font-size:.95rem;color:rgba(255,255,255,.75);line-height:1.8;margin-bottom:32px}
.btn-trial-cta{display:inline-block;background:linear-gradient(135deg,#f59e0b,#ef4444);color:white;padding:16px 44px;border-radius:50px;font-size:1.05rem;font-weight:700;text-decoration:none;transition:all .25s;box-shadow:0 6px 24px rgba(239,68,68,.4)}
.btn-trial-cta:hover{transform:translateY(-3px);box-shadow:0 10px 32px rgba(239,68,68,.55)}
/* Feature cards */
.trial-features{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:20px}
.tf-card{background:white;border-radius:12px;padding:24px 18px;text-align:center;box-shadow:0 2px 12px rgba(0,0,0,.07);border-top:4px solid #4361ee;transition:transform .2s}
.tf-card:hover{transform:translateY(-4px)}
.tf-icon{font-size:2.4rem;margin-bottom:10px}
.tf-logo{width:64px;height:64px;object-fit:contain;display:block;margin:0 auto 10px}
.tf-title{font-size:.95rem;font-weight:700;color:#16213e;margin-bottom:8px}
.tf-desc{font-size:.8rem;color:#666;line-height:1.7}
/* Steps row */
.trial-steps-row{display:flex;align-items:center;justify-content:center;gap:8px;background:white;border-radius:12px;padding:22px 20px;margin-bottom:20px;box-shadow:0 2px 12px rgba(0,0,0,.07);flex-wrap:wrap}
.ts-step{text-align:center}
.ts-num{width:36px;height:36px;border-radius:50%;background:#4361ee;color:white;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.9rem;margin:0 auto 6px}
.ts-txt{font-size:.78rem;font-weight:600;color:#333;white-space:nowrap}
.ts-arrow{font-size:1.2rem;color:#4361ee;font-weight:700;margin:0 4px}
/* CTA link buttons */
.trial-links{display:flex;gap:14px;justify-content:center;margin-bottom:10px;flex-wrap:wrap}
.tl-btn{display:inline-flex;align-items:center;gap:8px;padding:14px 30px;border-radius:10px;font-size:.92rem;font-weight:700;text-decoration:none;transition:all .2s}
.tl-primary{background:linear-gradient(135deg,#4361ee,#7c3aed);color:white;box-shadow:0 4px 16px rgba(67,97,238,.35)}
.tl-primary:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(67,97,238,.45)}
.tl-secondary{background:white;color:#4361ee;border:2px solid #4361ee}
.tl-secondary:hover{background:#f0f3ff;transform:translateY(-2px)}
/* Intro banner — ad-style 2 panels */
/* 3-column layout */
.three-col{display:grid;grid-template-columns:260px 1fr 260px;gap:0;max-width:1460px;margin:0 auto;padding:16px 16px 0;align-items:start;min-width:800px}
.three-col.two-col{grid-template-columns:260px 1fr}
.three-col.with-live-preview{grid-template-columns:260px 1fr 320px}
.col-left,.col-right{position:sticky;top:16px;max-height:calc(100vh - 80px);overflow-y:auto;scrollbar-width:thin;scrollbar-color:rgba(255,255,255,.2) transparent}
.col-left{padding-right:12px}
.col-right{padding-left:12px}
.col-center{min-width:0;overflow:hidden}
.live-preview-card{position:sticky;top:16px}
.live-preview-title{font-size:.92rem;font-weight:700;color:#333;margin-bottom:12px;display:flex;align-items:center;gap:6px}
.live-preview-metric{font-size:.78rem;color:#666;text-align:center;margin-top:8px}
.live-preview-metric b{color:#4361ee;font-size:.95rem}
.col-center .steps{background:white;border-bottom:1px solid #e0e0e0;padding:0 10px;overflow-x:auto;display:flex}
.col-center .container{max-width:none;margin:16px 0 0;padding:0}
/* Free trial nudge banner */
.free-trial-nudge{background:linear-gradient(135deg,#7c3aed,#4361ee);border-radius:12px;padding:16px 16px 14px;margin-top:12px;display:flex;flex-direction:column;gap:10px}
.ftn-icon{font-size:1.6rem;line-height:1}
.ftn-title{font-size:.82rem;font-weight:800;color:white;margin-bottom:3px}
.ftn-desc{font-size:.75rem;color:rgba(255,255,255,.8);line-height:1.6}
.ftn-btn{display:block;background:white;color:#4361ee;border-radius:8px;padding:10px 14px;font-size:.8rem;font-weight:800;text-align:center;text-decoration:none;transition:all .2s;box-shadow:0 2px 8px rgba(0,0,0,.15)}
.ftn-btn:hover{background:#f0f3ff;transform:translateY(-2px);box-shadow:0 4px 14px rgba(0,0,0,.2)}
/* API usage score (gamification) */
.api-score-card{background:linear-gradient(135deg,#0f3020,#1a3a2a);border-radius:12px;padding:14px 16px;margin-top:12px;display:flex;align-items:center;gap:12px}
.asc-icon{font-size:1.8rem;line-height:1}
.asc-label{font-size:.68rem;font-weight:700;color:#9be8b8;text-transform:uppercase;letter-spacing:.6px;margin-bottom:3px}
.asc-value{font-size:1.4rem;font-weight:800;color:white;transition:transform .2s ease}
.asc-value.pop{transform:scale(1.3)}
/* Left panel — experience guide */
.ip-left{background:linear-gradient(145deg,#1a1a2e 0%,#1e2a5e 100%);border-radius:14px;padding:24px 20px 20px;position:relative;overflow:hidden;display:flex;flex-direction:column;gap:0}
.ip-left::before{content:'🔌';position:absolute;right:18px;bottom:14px;font-size:5.5rem;opacity:.08;pointer-events:none;line-height:1}
.ip-left .ip-eyebrow{font-size:.68rem;font-weight:700;color:#818cf8;text-transform:uppercase;letter-spacing:1.2px;margin-bottom:8px}
.ip-left h2{font-size:1.1rem;font-weight:800;color:white;margin-bottom:12px;line-height:1.3}
.ip-left p{font-size:.82rem;color:rgba(255,255,255,.72);line-height:1.85;margin-bottom:14px}
.iflow{display:flex;flex-direction:column;gap:5px}
.iflow-row{display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.iflow-item{background:rgba(99,102,241,.3);border:1px solid rgba(99,102,241,.4);color:#c7d2fe;border-radius:6px;padding:3px 10px;font-size:.73rem;font-weight:600;white-space:nowrap}
.iflow-sep{color:rgba(255,255,255,.25);font-size:.75rem}
/* Right panel — World Cup */
.ip-right{background:linear-gradient(145deg,#0f2027 0%,#1a3a2a 50%,#0f3020 100%);border-radius:14px;padding:24px 20px 20px;position:relative;overflow:hidden;display:flex;flex-direction:column}
.ip-right::before{content:'⚽';position:absolute;right:16px;bottom:12px;font-size:6rem;opacity:.1;pointer-events:none;line-height:1}
.ip-right .ip-eyebrow{font-size:.68rem;font-weight:700;color:#4ade80;text-transform:uppercase;letter-spacing:1.2px;margin-bottom:8px}
.ip-right h2{font-size:1.1rem;font-weight:800;color:white;margin-bottom:16px;line-height:1.3}
.wc-rows{display:flex;flex-direction:column;gap:8px;flex:1}
.wc-row{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.08);border-radius:9px;padding:10px 14px;display:grid;grid-template-columns:auto 1fr;gap:0 12px;align-items:center}
.wr-icon{font-size:1.4rem}
.wr-info .wr-label{font-size:.64rem;color:rgba(255,255,255,.45);font-weight:600;text-transform:uppercase;letter-spacing:.5px;margin-bottom:2px}
.wr-info .wr-date{font-size:.86rem;color:white;font-weight:700;margin-bottom:1px}
.wr-info .wr-kst{font-size:.72rem;color:#fbbf24;font-weight:600}
.wr-info .wr-venue{font-size:.68rem;color:rgba(255,255,255,.4);margin-top:1px}
.wc-countdown-box{margin-top:12px;background:rgba(251,191,36,.1);border:1px solid rgba(251,191,36,.25);border-radius:9px;padding:10px 14px;text-align:center}
.wc-countdown-box .cd-label{font-size:.68rem;color:rgba(255,255,255,.5);margin-bottom:4px}
.wc-countdown-box #countdown-val{font-size:1.1rem;font-weight:800;color:#fbbf24;letter-spacing:.5px;font-variant-numeric:tabular-nums}

.lang-sw{display:flex;gap:5px;margin-left:auto;align-items:center;flex-shrink:0}
.lang-btn{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.28);color:rgba(255,255,255,.8);border-radius:6px;padding:5px 11px;font-size:.73rem;cursor:pointer;font-family:inherit;transition:all .2s;font-weight:500}
.lang-btn:hover{background:rgba(255,255,255,.22);color:white}
.lang-btn.active{background:rgba(255,255,255,.9);color:#1a1a2e;font-weight:700;border-color:transparent}
.lang-select{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.28);color:white;border-radius:6px;padding:5px 28px 5px 11px;font-size:.78rem;cursor:pointer;font-family:inherit;font-weight:500;transition:all .2s;appearance:none;-webkit-appearance:none;background-image:url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath fill='%23ffffff' d='M0 0l5 6 5-6z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 10px center}
.lang-select:hover{background-color:rgba(255,255,255,.22)}
.lang-select:focus{outline:none;border-color:rgba(255,255,255,.6)}
.lang-select option{color:#1a1a2e;background:#fff}