:root{--bg:#050a10;--panel:#09121c;--line:#20364a;--text:#f4f7fb;--muted:#9db0c5;--blue:#25b8ff;--violet:#7768ff;--max:1440px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:radial-gradient(circle at 70% 0,#0b2132 0,transparent 30%),var(--bg);color:var(--text);font-family:Inter,"PingFang SC","Microsoft YaHei",system-ui,sans-serif}a{color:inherit;text-decoration:none}button{font:inherit;color:inherit}.nav{height:72px;max-width:var(--max);margin:auto;padding:0 28px;display:flex;align-items:center;gap:42px;position:sticky;top:0;z-index:20;background:rgba(5,10,16,.82);backdrop-filter:blur(18px);border-bottom:1px solid rgba(255,255,255,.06)}.brand{display:flex;align-items:center;gap:10px;white-space:nowrap}.brand b{font-size:20px}.brand em{font-style:normal;color:#9b9cff;font-size:13px}.mark{display:grid;place-items:center;width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--blue),var(--violet));font-size:12px}.nav nav{display:flex;gap:28px;flex:1}.nav nav a{font-size:14px;color:#c8d3df}.nav nav a:hover,.nav nav .active{color:#fff}.actions{display:flex;gap:10px;align-items:center}.icon,.login,.secondary,.text-btn{background:transparent;border:1px solid var(--line);border-radius:12px;padding:10px 15px}.login{border-color:#586dd9}.hero{max-width:var(--max);min-height:590px;margin:auto;position:relative;display:grid;grid-template-columns:1.15fr .85fr;overflow:hidden;padding:82px 42px 54px}.hero-bg{position:absolute;inset:0;background:linear-gradient(90deg,rgba(5,10,16,.98) 5%,rgba(5,10,16,.75) 48%,rgba(5,10,16,.25)),url('design-reference.png') center/cover;opacity:.3}.hero-copy,.hero-card{position:relative;z-index:1}.eyebrow{color:#a5a2ff;letter-spacing:.18em;font-size:12px;font-weight:700}.hero h1{font-size:72px;line-height:1.04;margin:16px 0}.hero h1 span{background:linear-gradient(90deg,#9d76ff,#27bfff);-webkit-background-clip:text;color:transparent}.lead{max-width:650px;color:#c0cfdd;font-size:19px;line-height:1.8}.stats{display:flex;gap:30px;margin:30px 0}.stats span{color:var(--muted);font-size:12px}.stats b{display:block;color:#fff;font-size:18px}.cta{display:flex;gap:14px}.primary{display:inline-block;padding:16px 25px;border-radius:12px;background:linear-gradient(90deg,var(--violet),var(--blue));font-weight:700}.secondary{padding:15px 22px}.hero-card{align-self:center;justify-self:center;text-align:center;width:330px;height:390px;border:1px solid #34506b;border-radius:28px;background:linear-gradient(160deg,#13283b,#080d13);box-shadow:0 30px 80px #000;display:flex;flex-direction:column;align-items:center;justify-content:center;overflow:hidden}.hero-card:before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 50% 35%,#3a6790,transparent 35%),linear-gradient(160deg,transparent,#090d12);opacity:.8}.hero-card>*{z-index:1}.hero-card p{font-size:14px;letter-spacing:.14em}.hero-card button{width:82px;height:82px;border-radius:50%;border:1px solid #7b79ff;background:#07101a;font-size:24px;margin:25px}.hero-card small{margin-top:40px;color:#9db0c5}.categories,.workflow,.section,.prompt-zone,.final-cta,footer{max-width:calc(var(--max) - 60px);margin:0 auto}.categories{display:grid;grid-template-columns:repeat(6,1fr);gap:12px;margin-top:-12px;position:relative;z-index:3}.categories article{min-height:116px;padding:20px;border:1px solid var(--line);border-radius:14px;background:linear-gradient(160deg,#102131,#071019)}.categories b,.categories span{display:block}.categories span{font-size:12px;color:var(--muted);margin-top:8px}.workflow{margin-top:22px;padding:25px;border:1px solid var(--line);border-radius:16px;background:#08121b;display:grid;grid-template-columns:230px 1fr;gap:20px}.workflow h2{margin:0}.workflow>div>p:last-child{color:var(--muted);font-size:13px}.workflow ol{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(6,1fr);gap:8px}.workflow li{padding:12px;border-left:1px solid #263b4c}.workflow i,.workflow b,.workflow span{display:block}.workflow i{font-style:normal;color:#7d8dff;font-size:12px}.workflow span{color:var(--muted);font-size:11px;margin-top:5px}.section{padding:64px 0 0}.section-head{display:flex;justify-content:space-between;align-items:end;margin-bottom:22px}.section-head h2{font-size:30px;margin:5px 0}.section-head span{color:var(--muted);font-size:13px}.text-btn{color:#9e9eff}.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.tutorial{position:relative;padding-bottom:18px}.tutorial.extra{display:none}.cards.expanded .extra{display:block}.thumb{height:155px;border-radius:14px;border:1px solid #33475b;position:relative;overflow:hidden;background:radial-gradient(circle at 50% 40%,#325f80,#0b1420 50%,#050a10)}.thumb:after{content:"";position:absolute;inset:0;background:linear-gradient(135deg,transparent,rgba(118,103,255,.25))}.t1{background:radial-gradient(circle,#65486c,#0c1721 55%)}.t2{background:radial-gradient(circle at 70%,#426279,#09131d 55%)}.t3{background:radial-gradient(circle at 30%,#705234,#0b1118 55%)}.t4{background:radial-gradient(circle,#2e6d63,#081219 55%)}.t5{background:radial-gradient(circle,#69446b,#081119 55%)}.thumb span{position:absolute;right:10px;top:10px;z-index:2;padding:5px 8px;background:#5148b8;border-radius:9px;font-size:11px}.thumb i{position:absolute;left:18px;bottom:15px;z-index:2}.num{color:#8b8dff;margin-top:13px}.tutorial h3{margin:5px 0;font-size:17px}.tutorial p{color:var(--muted);font-size:13px;line-height:1.6;margin:0 0 10px}.tutorial small{color:#b7c6d5}.prompt-zone{margin-top:65px;border:1px solid #2b4260;border-radius:20px;padding:34px;background:linear-gradient(120deg,#0b1521,#11153a 65%,#09151f);display:grid;grid-template-columns:1fr 340px;gap:30px}.prompt-zone h2{font-size:32px;margin:8px 0}.prompt-zone p{color:#b4c3d2}.chips{display:flex;flex-wrap:wrap;gap:8px;margin:20px 0}.chips button{background:#0b1824;border:1px solid #38516b;border-radius:999px;padding:8px 12px}.chips button.selected{background:#4f50b5}.prompt-box{display:flex;gap:12px;background:#050a10;border:1px solid #273c50;border-radius:14px;padding:15px}.prompt-box code{flex:1;line-height:1.7;color:#d5e0e9}.prompt-box button{background:#4d58c9;border:0;border-radius:9px;padding:8px 12px}.prompt-zone aside{border:1px solid #44577d;border-radius:16px;padding:24px;background:rgba(255,255,255,.04)}.prompt-zone aside b{color:#91a0ff}.prompt-zone aside a{color:#53c7ff}.tools{display:grid;grid-template-columns:repeat(5,1fr);gap:13px}.tools article{border:1px solid var(--line);border-radius:15px;padding:18px;background:#08121b;min-height:160px}.tool-icon{width:42px;height:42px;border-radius:11px;background:linear-gradient(135deg,#243b4f,#171940);display:grid;place-items:center;font-weight:800;font-size:20px;margin-bottom:12px}.tools b,.tools span{display:block}.tools span{font-size:12px;color:#a8b8c7;margin:4px 0}.tools p{font-size:12px;color:#70879b;line-height:1.5}.gallery{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.gallery article{height:190px;border-radius:16px;border:1px solid #33475b;padding:18px;display:flex;flex-direction:column;justify-content:end;background:radial-gradient(circle at 50% 30%,#32618c,#09131c 60%)}.gallery .g2{background:radial-gradient(circle,#3f4657,#090e14 60%)}.gallery .g3{background:radial-gradient(circle,#7d563a,#101017 60%)}.gallery .g4{background:radial-gradient(circle,#6b4e62,#0a1318 60%)}.gallery span{font-size:12px;color:#b5c5d4}.updates{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.updates article{padding:24px;border:1px solid var(--line);border-radius:15px;background:#08121b}.updates time{color:#8f90ff}.updates p{color:var(--muted);line-height:1.7}.final-cta{margin-top:64px;margin-bottom:35px;padding:30px 45px;border:1px solid #355ca0;border-radius:18px;background:linear-gradient(100deg,#141747,#0d3461);display:flex;justify-content:space-between;align-items:center}.final-cta p{font-size:26px;font-weight:800;margin:0 0 8px}.final-cta span{color:#c5d3e0}.final-cta a{padding:16px 25px;border-radius:12px;background:linear-gradient(90deg,#7868ff,#20b9ff);font-weight:700}footer{border-top:1px solid var(--line);padding:30px 0 45px;display:flex;gap:28px;align-items:center;color:#879bae}footer p{flex:1}footer nav{display:flex;gap:20px;font-size:13px}.modal{display:none;position:fixed;inset:0;z-index:50;background:rgba(0,0,0,.88);place-items:center;padding:20px}.modal.show{display:grid}.modal-inner{width:min(900px,95vw);position:relative}.modal video{width:100%;max-height:75vh;background:#000;border-radius:18px}.modal-inner>button{position:absolute;right:-10px;top:-45px;background:none;border:0;font-size:35px}.modal p{color:#aebdcc;font-size:12px}.search-panel{position:fixed;right:-520px;top:0;width:min(500px,100%);height:100vh;z-index:60;background:#07111a;border-left:1px solid var(--line);padding:30px;transition:.3s}.search-panel.show{right:0}.search-panel>button{float:right;background:none;border:0;font-size:30px}.search-panel input{width:100%;margin-top:45px;padding:16px;border-radius:12px;border:1px solid var(--line);background:#0b1721;color:#fff}.search-panel a{display:block;padding:18px 0;border-bottom:1px solid #1a2b3a}.search-panel a span{display:block;color:var(--muted);font-size:12px;margin-top:5px}.soft{--bg:#0b1118;--panel:#111b25}.soft .hero-bg{opacity:.2}@media(max-width:900px){.nav{height:62px;padding:0 16px}.nav nav{display:none}.brand b{font-size:17px}.actions .icon:nth-child(2){display:none}.hero{min-height:650px;display:block;padding:58px 20px 28px}.hero h1{font-size:47px}.hero-card{display:none}.lead{font-size:16px}.stats{display:grid;grid-template-columns:1fr 1fr;gap:16px}.cta{flex-direction:column}.cta a,.cta button{text-align:center}.categories{overflow-x:auto;grid-template-columns:repeat(6,170px);padding:0 18px;margin-top:0}.workflow{margin:18px;display:block}.workflow ol{overflow-x:auto;grid-template-columns:repeat(6,150px);margin-top:20px}.section,.prompt-zone,.final-cta,footer{margin-left:18px;margin-right:18px}.section{padding-top:48px}.section-head{align-items:start;gap:15px}.section-head h2{font-size:24px}.cards{grid-template-columns:1fr 1fr}.thumb{height:125px}.prompt-zone{grid-template-columns:1fr;padding:22px}.prompt-zone aside{display:none}.tools{grid-template-columns:1fr 1fr}.gallery{grid-template-columns:1fr 1fr}.gallery article{height:150px}.updates{grid-template-columns:1fr}.final-cta{padding:24px;display:block}.final-cta a{display:block;text-align:center;margin-top:20px}footer{display:block}footer nav{flex-wrap:wrap}.prompt-box{display:block}.prompt-box button{margin-top:10px;width:100%}}@media(max-width:520px){.cards{grid-template-columns:1fr}.thumb{height:190px}.hero h1{font-size:42px}.hero .eyebrow{margin-top:10px}.tools{grid-template-columns:1fr 1fr}.gallery{grid-template-columns:1fr}.gallery article{height:180px}}

/* v2 platform pages */
.page-shell{max-width:1180px;margin:0 auto;padding:120px 28px 72px}.page-kicker{color:#9aa8ff;letter-spacing:.18em;font-size:12px;font-weight:700}.page-title{font-size:clamp(38px,6vw,72px);line-height:1.02;margin:14px 0 18px}.page-lead{max-width:760px;color:#aebbd0;font-size:18px;line-height:1.75}.subnav{display:flex;gap:10px;flex-wrap:wrap;margin:34px 0}.subnav a,.filter-btn{border:1px solid #263a4c;background:#0d1720;color:#c8d4e4;border-radius:999px;padding:10px 16px;text-decoration:none}.subnav a.active,.filter-btn.active{background:linear-gradient(135deg,#6d5cff,#18a9ff);color:#fff;border-color:transparent}.content-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.content-card{background:linear-gradient(180deg,#101b25,#0a1219);border:1px solid #203241;border-radius:20px;overflow:hidden;transition:.2s}.content-card:hover{transform:translateY(-3px);border-color:#4b62a6}.content-card .visual{height:170px;background:radial-gradient(circle at 70% 25%,#3754a4,transparent 25%),linear-gradient(135deg,#182b3c,#0a1118 60%);display:flex;align-items:end;padding:18px}.content-card .visual b{font-size:34px;color:#cfd6ff}.content-card .body{padding:20px}.content-card h3{margin:0 0 8px}.content-card p{color:#91a2b8;line-height:1.6;min-height:52px}.meta{display:flex;gap:12px;color:#7f91a7;font-size:13px}.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:28px}.article{background:#0b141c;border:1px solid #20313e;border-radius:22px;padding:clamp(22px,4vw,46px)}.article h2{margin-top:40px;font-size:28px}.article p,.article li{color:#b2bfd0;line-height:1.85}.article .callout{padding:18px 20px;border:1px solid #334a63;border-radius:16px;background:#0f1b27;margin:24px 0}.toc{position:sticky;top:100px;height:max-content;background:#0b141c;border:1px solid #20313e;border-radius:20px;padding:20px}.toc a{display:block;color:#91a4ba;text-decoration:none;padding:9px 0}.toc a:hover{color:#fff}.progress{height:7px;background:#14222d;border-radius:9px;overflow:hidden;margin:14px 0}.progress i{display:block;width:16%;height:100%;background:linear-gradient(90deg,#725cff,#1db7ff)}.prompt-builder{display:grid;grid-template-columns:1fr 1fr;gap:22px}.builder-panel,.result-panel{background:#0b141c;border:1px solid #20313e;border-radius:22px;padding:24px}.field{margin:0 0 18px}.field label{display:block;font-weight:700;margin-bottom:8px}.field select,.field textarea,.field input{width:100%;box-sizing:border-box;background:#071018;border:1px solid #293c4b;color:#eaf2ff;border-radius:12px;padding:13px}.result-box{min-height:210px;background:#071018;border:1px dashed #344a5c;border-radius:16px;padding:18px;color:#c8d5e7;line-height:1.7}.tool-directory{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.tool-card{background:#0b141c;border:1px solid #20313e;border-radius:18px;padding:20px}.tool-card .logo{width:48px;height:48px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,#1f3850,#272250);font-weight:800;font-size:20px}.tool-card p{color:#8fa0b5;line-height:1.5}.gallery-grid{columns:3;column-gap:16px}.gallery-item{break-inside:avoid;margin:0 0 16px;border-radius:18px;overflow:hidden;border:1px solid #223541;background:#0b141c}.gallery-art{height:220px;background:radial-gradient(circle at 30% 30%,#4b68a8,transparent 24%),linear-gradient(150deg,#111f2c,#090e13)}.gallery-item:nth-child(2n) .gallery-art{height:310px}.gallery-item .cap{padding:14px 16px}.stat-row{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:36px 0}.stat-box{background:#0b141c;border:1px solid #20313e;border-radius:18px;padding:20px}.stat-box b{font-size:28px}.stat-box span{display:block;color:#8fa0b5;margin-top:5px}.free-note{margin-top:34px;padding:20px;border-radius:18px;background:linear-gradient(135deg,rgba(112,87,255,.15),rgba(21,169,255,.08));border:1px solid #344a7c}.mobile-bottom{display:none}
@media(max-width:900px){.content-grid{grid-template-columns:1fr 1fr}.lesson-layout,.prompt-builder{grid-template-columns:1fr}.toc{position:static}.tool-directory{grid-template-columns:1fr 1fr}.gallery-grid{columns:2}.stat-row{grid-template-columns:1fr 1fr}}
@media(max-width:600px){.page-shell{padding:92px 16px 80px}.content-grid{grid-template-columns:1fr}.tool-directory{grid-template-columns:1fr 1fr;gap:10px}.gallery-grid{columns:1}.stat-row{grid-template-columns:1fr 1fr}.page-lead{font-size:16px}.mobile-bottom{display:flex;position:fixed;bottom:0;left:0;right:0;z-index:30;background:rgba(5,11,16,.94);backdrop-filter:blur(18px);border-top:1px solid #1c2d39;justify-content:space-around;padding:10px 6px calc(10px + env(safe-area-inset-bottom))}.mobile-bottom a{font-size:12px;color:#9aacbf;text-decoration:none}.mobile-bottom a.active{color:#fff}}

/* v3 course system */
.lesson-actions{display:flex;gap:12px;flex-wrap:wrap;margin:28px 0}
.complete-btn{border:1px solid #4d6b85;background:#101d28;color:#eaf4ff;padding:13px 18px;border-radius:12px;font-weight:800;cursor:pointer}
.complete-btn.done{background:linear-gradient(135deg,#705cff,#16b7ff);border-color:transparent}
.done-badge{position:absolute;right:14px;top:14px;background:#122d2a;color:#7fffd4;border:1px solid #2b6f61;padding:5px 8px;border-radius:999px;font-size:12px}
.content-card .visual{position:relative}.content-card.is-done{outline:1px solid #2b6f61}
.practice-box{margin:28px 0;padding:22px;border:1px solid #37516a;border-radius:16px;background:linear-gradient(135deg,rgba(94,79,255,.12),rgba(0,183,255,.06))}
.practice-box h3{margin-top:0}.lesson-nav{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:30px}.lesson-nav a{padding:16px;border:1px solid #263c50;border-radius:14px;text-decoration:none;color:#dcecff;background:#0c1720}.lesson-nav a:last-child{text-align:right}
.learning-dashboard{margin:26px 0;padding:20px;border:1px solid #24394d;border-radius:16px;background:#0a151e}.learning-dashboard .bar{height:9px;background:#142432;border-radius:99px;overflow:hidden;margin-top:10px}.learning-dashboard .bar i{display:block;height:100%;background:linear-gradient(90deg,#755cff,#16b7ff);border-radius:99px}
@media(max-width:720px){.lesson-nav{grid-template-columns:1fr}.lesson-nav a:last-child{text-align:left}}

/* v4 libraries */
.filter-row{display:flex;gap:9px;flex-wrap:wrap;margin:24px 0}.filter-btn{border:1px solid #294055;background:#0b1720;color:#bcd0e5;padding:9px 13px;border-radius:999px;cursor:pointer}.filter-btn.active,.filter-btn:hover{border-color:#6c63ff;color:white;background:#17243b}
.prompt-output{padding:20px;border-radius:15px;background:#08131b;border:1px solid #294055;line-height:1.9;margin:14px 0 16px;color:#e7f1ff}
.tool-detail-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin:30px 0}.tool-detail-card{display:grid;grid-template-columns:70px 1fr;gap:16px;padding:20px;border:1px solid #24394d;border-radius:17px;background:#0a151e;text-decoration:none;color:#eaf4ff}.tool-detail-card:hover{transform:translateY(-2px);border-color:#506a85}.tool-detail-card h3{margin:4px 0 7px}.tool-detail-card p{color:#91a7bc;line-height:1.6}.tool-icon{width:60px;height:60px;display:grid;place-items:center;border-radius:15px;background:linear-gradient(135deg,#6659ff,#10b8ff);font-weight:900;font-size:18px}.chip-row{display:flex;gap:7px;flex-wrap:wrap}.chip-row span{font-size:12px;padding:5px 8px;border-radius:999px;background:#122230;color:#9fc2e4;border:1px solid #243b50}
@media(max-width:760px){.tool-detail-grid{grid-template-columns:1fr}.tool-detail-card{grid-template-columns:52px 1fr}.tool-icon{width:48px;height:48px}}

/* v5 projects + retention */
.project-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:30px 0}.project-card{display:block;padding:22px;border-radius:18px;border:1px solid #263c50;background:linear-gradient(145deg,#0c1822,#0a121a);text-decoration:none;color:#edf6ff;min-height:210px}.project-card:hover{transform:translateY(-3px);border-color:#536f8d}.project-no{font-size:12px;letter-spacing:.12em;color:#7f91ff;font-weight:800}.project-card h3{font-size:22px;margin:22px 0 9px}.project-card p{color:#91a7bc;line-height:1.65}.project-card .meta{display:flex;justify-content:space-between;color:#7f96ac;font-size:12px;margin-top:18px}.table-wrap{overflow-x:auto}.shot-table{width:100%;border-collapse:collapse;margin:14px 0 25px}.shot-table th,.shot-table td{padding:13px;border-bottom:1px solid #223647;text-align:left}.shot-table th{color:#8fa9c1;font-size:12px}.related-block{margin:70px 0 20px;padding:26px;border:1px solid #2a4155;border-radius:20px;background:linear-gradient(135deg,rgba(105,86,255,.10),rgba(0,190,255,.05));display:grid;grid-template-columns:1fr 1fr;gap:24px}.related-block h2{margin:5px 0}.related-block p{color:#91a7bc}.related-links{display:grid;grid-template-columns:1fr 1fr;gap:9px}.related-links a{padding:13px;border-radius:12px;background:#0a1720;border:1px solid #294155;text-decoration:none;color:#ddecff}.home-projects{margin-top:70px}
@media(max-width:820px){.project-grid{grid-template-columns:1fr}.related-block{grid-template-columns:1fr}.related-links{grid-template-columns:1fr 1fr}}

/* v6 product polish */
.nav-mini{color:#91a7bc;text-decoration:none;font-size:13px;margin-right:12px}.nav-mini:hover{color:#fff}
.continue-card{margin:20px 0 28px;padding:20px 22px;border-radius:18px;border:1px solid #3b5268;background:linear-gradient(135deg,rgba(102,83,255,.13),rgba(0,188,255,.07));display:flex;justify-content:space-between;gap:20px;align-items:center;text-decoration:none;color:#edf7ff}.continue-card small{color:#8f83ff}.continue-card h3{margin:5px 0}.continue-card p{margin:0;color:#8fa6bb}.continue-card>b{white-space:nowrap}
.search-box{display:flex;gap:10px;margin:26px 0 12px}.search-box input{flex:1;min-width:0;padding:16px 18px;border-radius:14px;border:1px solid #2b4256;background:#08131b;color:#edf7ff;font-size:16px;outline:none}.search-box input:focus{border-color:#6e64ff}.search-box button{padding:0 22px;border:0;border-radius:14px;background:linear-gradient(135deg,#6c59ff,#12baff);color:white;font-weight:800;cursor:pointer}.search-meta{color:#7890a7;margin:12px 0}.search-results{display:grid;gap:10px;margin:20px 0 50px}.search-result{display:grid;grid-template-columns:70px 1fr 30px;gap:16px;align-items:center;padding:17px;border-radius:15px;border:1px solid #23394c;background:#0a151e;color:#eaf4ff;text-decoration:none}.search-result>span{font-size:12px;color:#8e83ff}.search-result h3{margin:0 0 5px}.search-result p{margin:0;color:#8ca3b8;line-height:1.5}.empty-state{padding:22px;border:1px dashed #344c61;border-radius:15px;color:#8fa6bb;background:#09131b}.error-page{min-height:70vh;display:flex;flex-direction:column;justify-content:center}.error-code{font-size:clamp(80px,18vw,180px);font-weight:950;line-height:.8;color:#101f2d;text-shadow:0 0 50px rgba(83,91,255,.15)}
@media(max-width:760px){.nav-mini{display:none}.continue-card{align-items:flex-start;flex-direction:column}.search-result{grid-template-columns:55px 1fr 20px}.search-box button{padding:0 16px}}

/* v7 launch polish */
.goal-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:26px 0}.goal-grid>a{min-height:210px;padding:21px;border:1px solid #253b4f;border-radius:18px;background:linear-gradient(145deg,#0b1720,#09121a);text-decoration:none;color:#edf6ff}.goal-grid>a:hover{border-color:#536f8d;transform:translateY(-3px)}.goal-grid b{color:#786dff;font-size:13px}.goal-grid h3{margin:34px 0 8px;font-size:19px}.goal-grid p{color:#8fa5ba;line-height:1.6}
.smart-rec{margin:56px 0 20px}.smart-rec .section-head{display:flex;justify-content:space-between;align-items:end;gap:20px}.smart-rec .section-head small{color:#8177ff}.smart-rec .section-head h2{margin:5px 0}.smart-rec .section-head>a{color:#90b9df;text-decoration:none}.rec-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:18px}.rec-grid>a{padding:17px;border:1px solid #263b4e;border-radius:15px;background:#0a151e;text-decoration:none;color:#eaf4ff}.rec-grid span{font-size:11px;color:#8a80ff}.rec-grid h3{font-size:15px;line-height:1.4;margin:9px 0}.rec-grid p{font-size:12px;color:#7f96ab;line-height:1.55}
@media(max-width:900px){.goal-grid{grid-template-columns:1fr 1fr}.rec-grid{grid-template-columns:1fr 1fr}}
@media(max-width:430px){
  html{scroll-padding-top:72px} body{padding-bottom:76px}
  .page-shell{padding-left:16px!important;padding-right:16px!important}
  .nav{padding-left:15px!important;padding-right:15px!important;min-height:62px}
  .nav nav{display:none!important}.brand b{font-size:15px}.brand em{font-size:9px}
  .page-title{font-size:clamp(31px,9vw,42px)!important;line-height:1.08!important;letter-spacing:-.035em}
  .page-lead{font-size:15px!important;line-height:1.7!important}
  .goal-grid,.rec-grid{grid-template-columns:1fr}
  .goal-grid>a{min-height:auto}.goal-grid h3{margin-top:20px}
  .content-grid{grid-template-columns:1fr!important}
  .article{font-size:16px;line-height:1.85}.article h2{font-size:23px;margin-top:38px}
  .toc{display:none!important}
  .lesson-layout{display:block!important}
  .prompt-output{font-size:15px;line-height:1.8}
  .hero-actions{display:grid!important;grid-template-columns:1fr;gap:10px}
  .hero-actions a,.hero-actions button{width:100%;justify-content:center;text-align:center}
  .mobile-bottom{padding-bottom:max(8px,env(safe-area-inset-bottom))}
  .search-box{position:sticky;top:8px;z-index:20;background:rgba(6,13,19,.92);padding:8px 0;backdrop-filter:blur(12px)}
  .search-result{padding:14px 12px;gap:10px}
  .continue-card{padding:17px}
}
@media(max-width:390px){
  .page-shell{padding-left:14px!important;padding-right:14px!important}
  .section{padding-left:14px!important;padding-right:14px!important}
  .content-card .body{padding:15px}
}

/* v8 original media */
.lesson-video{margin:24px 0;padding:16px;border:1px solid #263d50;border-radius:18px;background:#08131b}.lesson-video video{display:block;width:100%;max-height:680px;border-radius:13px;background:#000;margin:10px 0}.lesson-video small{color:#7890a6}

/* v9 video library */
.video-library{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:30px 0}.video-card{border:1px solid #253b4e;border-radius:18px;background:#09141d;overflow:hidden}.video-thumb{aspect-ratio:9/16;background:#000;max-height:440px;overflow:hidden}.video-thumb video{width:100%;height:100%;object-fit:cover}.video-card .body{padding:16px}.video-card small{color:#8178ff}.video-card h3{font-size:17px;margin:7px 0}.video-card p{font-size:13px;color:#8ca3b8;line-height:1.55}.video-card code{font-size:10px;color:#657d92;word-break:break-all}
@media(max-width:900px){.video-library{grid-template-columns:repeat(2,1fr)}}@media(max-width:520px){.video-library{grid-template-columns:1fr}.video-thumb{max-height:620px}}

/* v10 teaching demos */
.lesson-demo-section{margin:34px 0}.lesson-demo-section h2{margin:6px 0 16px}.demo-grid,.demo-library{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.demo-library{margin:30px 0}.demo-card{overflow:hidden;border:1px solid #263d50;border-radius:16px;background:#09141d}.demo-card video{display:block;width:100%;aspect-ratio:9/16;max-height:380px;object-fit:cover;background:#000}.demo-card>div{padding:13px}.demo-card b{display:block;color:#edf6ff;margin-bottom:5px}.demo-card p{margin:0;color:#9bb0c4;font-size:13px;line-height:1.5}.demo-card small{display:block;color:#718aa1;font-size:11px;margin-top:6px}
@media(max-width:760px){.demo-grid,.demo-library{grid-template-columns:1fr 1fr}.demo-card video{max-height:460px}}@media(max-width:430px){.demo-grid,.demo-library{grid-template-columns:1fr}.demo-card video{max-height:600px}}

/* v11 problem-to-fix teaching */
.compare-section{margin:36px 0}.compare-section h2{margin:6px 0 16px}.compare-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.compare-card{padding:17px;border:1px solid #263d50;border-radius:16px;background:#09141d}.compare-no{font-size:11px;color:#8177ff}.compare-card h3{margin:8px 0 15px}.compare-card .bad,.compare-card .fix{padding:11px;border-radius:11px;margin-top:8px;background:#0c1822}.compare-card small{color:#7890a6}.compare-card p{margin:4px 0 0;line-height:1.55;color:#b6c8d8;font-size:13px}.compare-card .fix{border:1px solid #29465a}
@media(max-width:700px){.compare-grid{grid-template-columns:1fr}}

/* v12 full case studies */
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:28px 0}.case-card{overflow:hidden;border:1px solid #263c50;border-radius:19px;background:#09141d;text-decoration:none;color:#edf6ff}.case-card img{width:100%;aspect-ratio:16/10;object-fit:cover;display:block}.case-card>div{padding:18px}.case-card small{color:#8178ff}.case-card h3{font-size:22px;margin:7px 0}.case-card p{color:#8fa6bb;line-height:1.6}.case-card b{font-size:13px;color:#b9d7f5}.case-hero{display:block;width:100%;max-height:620px;object-fit:cover;border-radius:22px;border:1px solid #263c50;margin:24px 0}.case-article{max-width:900px}.case-step{display:grid;grid-template-columns:150px 1fr;gap:20px;padding:18px 0;border-bottom:1px solid #203444}.case-step span{font-weight:800;color:#8d84ff}.case-step p{margin:0}.check-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:16px 0}.check-grid>div{padding:13px;border:1px solid #294054;border-radius:12px;background:#0a151e;color:#b9cbdc}
@media(max-width:800px){.case-grid{grid-template-columns:1fr}.home-cases .case-card:nth-child(n+3){display:none}.case-step{grid-template-columns:1fr;gap:5px}.check-grid{grid-template-columns:1fr}.case-hero{border-radius:15px}}

/* v13 production dossier */
.production-dossier{margin:42px 0}.identity-card{display:grid;grid-template-columns:1fr 1fr;gap:20px;padding:20px;border:1px solid #2b4358;border-radius:18px;background:#09151e;margin:14px 0 28px}.identity-card h3{margin:5px 0}.identity-card ul{margin:0;padding-left:20px;color:#a9bdcf;line-height:1.8}.shot-table-wrap{overflow:auto;margin:12px 0 30px;border:1px solid #263d50;border-radius:15px}.shot-table{width:100%;border-collapse:collapse;min-width:850px}.shot-table th,.shot-table td{padding:12px;border-bottom:1px solid #1e3343;text-align:left;font-size:12px}.shot-table th{color:#8f89ff;background:#0b1822}.shot-done{border:1px solid #3b5367;border-radius:9px;background:#0d1b25;color:#c1d0dc;padding:7px 9px}.shot-done.is-done{border-color:#6e65ff;color:white}.prompt-versions{display:grid;gap:10px}.prompt-version{border:1px solid #273e51;border-radius:14px;padding:15px;background:#09151e}.prompt-version>div{display:flex;justify-content:space-between;gap:12px}.prompt-version b{color:#938cff}.prompt-version small{color:#748ba0}.prompt-version p{color:#b8c9d8;line-height:1.65;margin-bottom:0}.final-film{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:38px 0}.final-placeholder{min-height:240px;border:1px dashed #425c72;border-radius:18px;background:radial-gradient(circle at 50% 30%,#172b3c,#071119);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;text-align:center}.final-placeholder span{font-size:36px}.final-placeholder small{color:#7890a6}
@media(max-width:700px){.identity-card,.final-film{grid-template-columns:1fr}.identity-card{gap:8px}.prompt-version>div{display:block}.prompt-version small{display:block;margin-top:5px}.shot-table-wrap{margin-left:-4px;margin-right:-4px}}

/* v14 case films */
.shot-reel{margin:42px 0}.shot-reel-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.shot-reel-grid article{border:1px solid #263d50;border-radius:14px;overflow:hidden;background:#09141d}.shot-reel-grid video{display:block;width:100%;aspect-ratio:9/16;max-height:360px;object-fit:cover;background:#000}.shot-reel-grid span{display:block;padding:10px 12px;font-size:12px;color:#a9bdd0}.final-video-wrap{width:100%;max-width:360px;margin:auto}.final-video-wrap video{width:100%;aspect-ratio:9/16;object-fit:cover;background:#000;border-radius:16px}.final-video-wrap small{display:block;text-align:center;color:#7890a6;margin-top:7px}
@media(max-width:650px){.shot-reel-grid{grid-template-columns:repeat(2,1fr)}.shot-reel-grid video{max-height:420px}}@media(max-width:390px){.shot-reel-grid{grid-template-columns:1fr 1fr}}


/* v15 — iPhone-first UX */
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-padding-top:76px}
body{overflow-x:hidden;-webkit-tap-highlight-color:transparent}
button,a,input{touch-action:manipulation}
button,a{min-height:44px}
img,video{max-width:100%}
@supports(padding:max(0px)){
 body{padding-left:env(safe-area-inset-left);padding-right:env(safe-area-inset-right)}
 .mobile-nav{padding-bottom:max(8px,env(safe-area-inset-bottom))}
}
@media(max-width:430px){
 body{padding-bottom:calc(78px + env(safe-area-inset-bottom,0px))}
 .page-shell{width:auto;max-width:none;padding-left:16px;padding-right:16px}
 .page-title{font-size:clamp(30px,9vw,40px);line-height:1.06;letter-spacing:-.035em}
 .page-lead{font-size:15px;line-height:1.68}
 .section{padding-top:42px;padding-bottom:42px}
 .section-head{align-items:flex-start;gap:14px}
 .section-head h2{font-size:25px;line-height:1.12}
 .hero{min-height:auto;padding-top:78px;padding-bottom:38px}
 .hero h1{font-size:clamp(38px,11vw,52px);line-height:1.01;letter-spacing:-.045em}
 .hero p{font-size:15px;line-height:1.65}
 .hero-actions{display:grid;grid-template-columns:1fr;gap:10px}
 .hero-actions a,.hero-actions button{width:100%;min-height:50px;display:flex;align-items:center;justify-content:center}
 .mobile-nav{position:fixed;left:8px;right:8px;bottom:8px;z-index:999;border-radius:20px;background:rgba(7,14,20,.92);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);border:1px solid rgba(118,145,166,.2);box-shadow:0 12px 40px rgba(0,0,0,.35)}
 .mobile-nav a{min-width:56px;min-height:54px;padding:7px 5px;font-size:10px}
 .case-card,.video-card,.demo-card,.compare-card{border-radius:16px}
 .case-card img{aspect-ratio:16/9}
 .case-card>div{padding:15px}
 .case-card h3{font-size:20px}
 .case-hero{max-height:440px;aspect-ratio:4/5;object-fit:cover}
 .article{font-size:15px;line-height:1.75}
 .article h2{font-size:24px;line-height:1.18;margin-top:36px}
 .article h3{font-size:18px}
 .callout,.practice-box{padding:16px;border-radius:14px}
 .prompt-output{font-size:13px;line-height:1.65;overflow-wrap:anywhere}
 .complete-btn{width:100%;min-height:48px}
 .identity-card{padding:15px}
 .shot-table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;scroll-snap-type:x proximity}
 .shot-table{min-width:760px}
 .shot-table th,.shot-table td{padding:10px;font-size:11px}
 .shot-done{min-height:40px;white-space:nowrap}
 .shot-reel-grid{display:flex;overflow-x:auto;gap:10px;padding-bottom:8px;scroll-snap-type:x mandatory;-webkit-overflow-scrolling:touch}
 .shot-reel-grid article{flex:0 0 72%;scroll-snap-align:start}
 .shot-reel-grid video{max-height:none}
 .final-film{display:block}
 .final-film>div:first-child{margin-bottom:16px}
 .final-video-wrap{max-width:100%}
 .final-video-wrap video{max-height:68vh}
 .demo-grid,.demo-library{display:flex;overflow-x:auto;gap:10px;padding-bottom:8px;scroll-snap-type:x mandatory;-webkit-overflow-scrolling:touch}
 .demo-card{flex:0 0 76%;scroll-snap-align:start}
 .demo-card video{max-height:none}
 .compare-grid{display:flex;overflow-x:auto;gap:10px;padding-bottom:8px;scroll-snap-type:x mandatory}
 .compare-card{flex:0 0 84%;scroll-snap-align:start}
 .check-grid{gap:8px}
 .check-grid>div{font-size:13px;padding:11px}
 .related-block{padding:18px;border-radius:16px}
 .related-links{display:grid;grid-template-columns:1fr;gap:8px}
 .related-links a{display:flex;align-items:center;padding:11px 13px}
 input[type="search"],input[type="text"]{font-size:16px;min-height:48px} /* prevent iOS auto zoom */
}
@media(max-width:390px){
 .page-shell{padding-left:14px;padding-right:14px}
 .hero{padding-top:70px}
 .page-title{font-size:34px}
 .shot-reel-grid article{flex-basis:78%}
 .demo-card{flex-basis:82%}
}
@media(max-width:375px){
 .page-shell{padding-left:12px;padding-right:12px}
 .hero h1{font-size:38px}
 .mobile-nav{left:6px;right:6px;bottom:6px}
}

.iphone-quick-start{display:none}
@media(max-width:430px){.iphone-quick-start{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:0 14px 12px;padding:14px 15px;border:1px solid #2b4358;border-radius:15px;background:#0a1620}.iphone-quick-start div{min-width:0}.iphone-quick-start small{display:block;color:#8178ff;font-size:10px}.iphone-quick-start b{display:block;font-size:13px;margin-top:4px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.iphone-quick-start a{flex:0 0 auto;font-size:12px;color:#c9dfff;text-decoration:none;padding:0 4px}}

/* v16 production mobile performance */
@media(max-width:430px){
 .case-card,.video-card,.demo-card,.compare-card,.tool-card,.prompt-card{content-visibility:auto;contain-intrinsic-size:320px 420px}
 .section:not(:first-of-type){content-visibility:auto;contain-intrinsic-size:390px 700px}
 img{height:auto}
 video{background:#05090d}
}
@media(prefers-reduced-motion:reduce){
 *,*::before,*::after{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}

.site-footer{max-width:1180px;margin:60px auto 0;padding:30px 22px 40px;border-top:1px solid #203444;color:#8097aa}.site-footer b{color:#e9f3fb}.site-footer p{max-width:620px;font-size:13px;line-height:1.6}.site-footer nav{display:flex;gap:18px;flex-wrap:wrap;margin:16px 0}.site-footer a{color:#a8bdd0;text-decoration:none;font-size:13px;display:inline-flex;align-items:center}.site-footer small{font-size:11px;line-height:1.6}
@media(max-width:430px){.site-footer{margin-top:42px;padding:24px 16px calc(100px + env(safe-area-inset-bottom,0px))}.site-footer nav{display:grid;grid-template-columns:1fr 1fr;gap:8px}.site-footer a{min-height:44px;border:1px solid #253a4b;border-radius:11px;padding:0 12px}}

/* v17 final iPhone 390x844 first-screen tuning */
@media (width:390px) and (max-height:844px){
 .hero{padding-top:64px!important;padding-bottom:24px!important}
 .hero h1{font-size:40px!important;max-width:355px;margin-bottom:12px}
 .hero p{font-size:14px!important;line-height:1.58!important;max-width:350px}
 .hero-actions{margin-top:18px!important;gap:8px!important}
 .hero-actions a,.hero-actions button{min-height:48px!important}
 .iphone-quick-start{margin-top:4px!important}
}

@media(max-width:430px){
 body:has(.article) .page-shell{padding-top:70px}
 body:has(.article) .page-kicker{font-size:10px;margin-bottom:7px}
 body:has(.article) .page-title{font-size:32px;line-height:1.08;margin-bottom:10px}
 body:has(.article) .page-lead{margin-bottom:16px}
 body:has(.article) .lesson-video{margin-top:16px}
}

@media(max-width:430px){
 .case-hero{aspect-ratio:16/10!important;max-height:245px!important;margin:16px 0!important}
 .case-article{margin-top:0}
 .production-dossier{margin-top:30px}
}

@media(max-width:430px){
 body{font-size:15px}
 .site-footer small{font-size:12px}
 .page-kicker,.eyebrow{letter-spacing:.08em}
 .hero-actions>*:nth-child(n+3){display:none}
 .section-head .text-link{min-height:44px;display:inline-flex;align-items:center}
}

/* v20 verified iPhone bottom navigation selector */
@media(max-width:600px){
 .mobile-bottom{left:8px;right:8px;bottom:8px;width:auto;border:1px solid rgba(118,145,166,.22);border-radius:18px;background:rgba(7,14,20,.94);box-shadow:0 12px 40px rgba(0,0,0,.35);padding:7px 6px max(7px,env(safe-area-inset-bottom));}
 .mobile-bottom a{min-width:56px;min-height:44px;display:flex;align-items:center;justify-content:center;border-radius:11px;}
 .tool-home-card{display:block;border:1px solid var(--line);border-radius:15px;padding:18px;background:#08121b;min-height:160px;}
}

/* v20 audit follow-up: linked cards must keep desktop card layout */
.tutorial{display:block;color:inherit;text-decoration:none}
.tool-home-card{display:block;border:1px solid var(--line);border-radius:15px;padding:18px;background:#08121b;min-height:160px;color:inherit;text-decoration:none}
.tool-home-card b,.tool-home-card span{display:block}
.tool-home-card span{font-size:12px;color:#a8b8c7;margin:4px 0}
.tool-home-card p{font-size:12px;color:#70879b;line-height:1.5}
.tool-home-card:hover,.tutorial:hover{border-color:#4b62a6}