:root{--ink:#102a35;--muted:#5b6e75;--paper:#f7f7f2;--line:#d6e1dc;--mint:#63d6a4;--teal:#0d5d61;--navy:#102a35;--sun:#f3ca65}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:"Hiragino Sans","Yu Gothic",Meiryo,sans-serif;font-feature-settings:"palt"}a{color:inherit}.shell{width:min(1120px,calc(100% - 48px));margin:auto}.skip-link{position:fixed;z-index:20;top:-64px;left:20px;padding:12px 18px;border-radius:8px;background:#fff;box-shadow:0 6px 20px #0002}.skip-link:focus{top:20px}.eyebrow{margin:0 0 16px;color:var(--teal);font-size:.72rem;font-weight:800;letter-spacing:.16em}.light{color:#a7ecc8}.hero{position:relative;isolation:isolate;min-height:720px;overflow:hidden;background:linear-gradient(118deg,#102a35 0%,#123f48 52%,#0e5254 100%);color:#fff}.hero:after{position:absolute;z-index:-1;right:-170px;bottom:-280px;width:740px;height:740px;border:1px solid #8df0c466;border-radius:50%;box-shadow:0 0 0 62px #8df0c414,0 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0;color:#d6eae4;font-size:.94rem;line-height:1.9}.text-link{display:inline-flex;gap:16px;color:#bbf1d8;font-size:.83rem;font-weight:800;text-decoration:none}.attention-panel{padding:28px;border:1px solid #9dd8c5;background:#0b5154}.attention-panel>p{margin:0 0 14px;color:#bdebd5;font-size:.75rem;font-weight:800;letter-spacing:.08em}.attention-panel>div{display:grid;grid-template-columns:88px 1fr;gap:14px;padding:19px 0;border-top:1px solid #6fae9f}.attention-panel span{color:#aee2ca;font-size:.76rem;font-weight:800}.attention-panel strong{font-size:.95rem;line-height:1.5}.safety{display:grid;grid-template-columns:.8fr 1.2fr;gap:10%;padding:124px 0}.safety ol{display:grid;gap:0;margin:0;padding:0;list-style:none;border-top:1px solid var(--line)}.safety li{display:grid;grid-template-columns:38px 1fr;gap:14px;padding:22px 0;border-bottom:1px solid var(--line)}.safety li>span{color:var(--teal);font-family:Georgia,serif;font-size:1.2rem}.safety h3{margin:0;font-size:1.05rem}.safety li 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div:nth-child(2){display:none}.principles,.curriculum,.safety{padding:84px 0}.split,.curriculum-intro,.highlight-grid,.safety{display:block}.split>.eyebrow{min-width:0;padding-top:0}.principle-grid,.path-grid,.course-grid{grid-template-columns:1fr}.principle-grid{margin-top:42px}.principle-grid article{min-height:220px}.principle-grid h3{margin-top:28px}.path{padding:74px 0}.path-grid{margin-top:38px}.path-grid a{min-height:188px}.curriculum-intro>p{margin-top:18px}.course-grid{margin-top:38px}.course-card{min-height:0;padding:24px 21px 20px}.highlight-grid{padding:80px 0}.attention-panel{margin-top:42px}.safety ol{margin-top:42px}.footer{grid-template-columns:1fr;gap:18px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.button,.path-grid a{transition:none}}
/* PHP lesson pages */
.inner-header{border-bottom:1px solid var(--line);background:#fff}.inner-header>.shell{display:flex;align-items:center;justify-content:space-between;padding:17px 0}.inner-brand{display:inline-flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none}.inner-brand b,.inner-brand small{display:block}.inner-brand b{font-size:.96rem;letter-spacing:.06em}.inner-brand small{margin-top:2px;color:#6a8981;font-size:.55rem;letter-spacing:.16em}.inner-header nav{display:flex;gap:24px}.inner-header nav a{color:var(--teal);font-size:.8rem;font-weight:800;text-decoration:none}.read-link{display:flex;justify-content:space-between;margin-top:17px;padding-top:14px;border-top:1px solid var(--line);color:var(--teal);font-size:.8rem;font-weight:800;text-decoration:none}.chapter-main{padding:50px 0 88px}.chapter-shell{width:min(920px,calc(100% - 48px));margin:auto}.chapter-back{margin:0 0 30px;font-size:.84rem;font-weight:800}.chapter-back a{color:var(--teal);text-decoration:none}.chapter-hero{padding:44px 48px;background:linear-gradient(125deg,#103440,#125f61);color:#fff}.chapter-hero .eyebrow{color:#a7ecc8}.chapter-hero h1{max-width:790px;margin:0;font-family:Georgia,"Yu Mincho",serif;font-size:clamp(2.3rem,5vw,4.4rem);font-weight:500;line-height:1.22;letter-spacing:-.045em}.chapter-hero>p:not(.eyebrow){max-width:680px;margin:24px 0;color:#d5e7e2;font-size:.98rem;line-height:1.9}.chapter-hero .tags{margin-top:0;padding-top:0}.chapter-article{padding:58px 8px 20px;font-size:1rem;line-height:1.95}.chapter-article h1,.chapter-article h2,.chapter-article h3,.chapter-article h4{scroll-margin-top:24px;color:var(--ink);line-height:1.4}.chapter-article h1{margin:0 0 28px;font-family:Georgia,"Yu Mincho",serif;font-size:2.15rem}.chapter-article h2{margin:60px 0 22px;padding-bottom:13px;border-bottom:2px solid #9ed6bd;font-family:Georgia,"Yu Mincho",serif;font-size:1.75rem}.chapter-article h3{margin:38px 0 15px;font-size:1.2rem}.chapter-article h4{margin:28px 0 10px;font-size:1.05rem}.chapter-article p{margin:0 0 20px}.chapter-article a{color:#0d5d61;text-decoration-thickness:1px;text-underline-offset:3px}.chapter-article ul,.chapter-article ol{margin:0 0 22px;padding-left:1.65rem}.chapter-article li{margin:7px 0}.chapter-article blockquote{margin:28px 0;padding:18px 21px;border-left:4px solid var(--mint);background:#eaf5ed;color:#31534d}.chapter-article hr{margin:46px 0;border:0;border-top:1px solid var(--line)}.chapter-article code{padding:2px 5px;border-radius:3px;background:#edf3ef;font-family:Consolas,"Courier New",monospace;font-size:.88em}.code-block,.mermaid-block{margin:25px 0;border:1px solid #b8cbc3;background:#172d35;color:#effbf5}.code-block pre,.mermaid-block pre{overflow:auto;margin:0;padding:20px;white-space:pre-wrap;line-height:1.65}.code-block code,.mermaid-block code{padding:0;background:transparent;color:inherit}.mermaid-block{background:#f1f7f3;color:var(--ink)}.mermaid-block figcaption{padding:11px 18px;border-bottom:1px solid #b8cbc3;background:#e4f0e8;color:#35675b;font-size:.78rem;font-weight:800}.table-wrap{overflow-x:auto;margin:25px 0;border:1px solid var(--line)}.chapter-article table{width:100%;border-collapse:collapse;min-width:560px;font-size:.88rem;line-height:1.65}.chapter-article th,.chapter-article td{padding:12px 14px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);text-align:left;vertical-align:top}.chapter-article th{background:#eaf5ed;color:#204d45;font-size:.8rem}.diagram-note{margin:20px 8px 0;padding:13px 16px;border:1px solid var(--line);background:#fffaf0;color:#745d37;font-size:.78rem;line-height:1.7}.chapter-nav{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:55px;padding-top:25px;border-top:1px solid var(--line)}.chapter-nav a{min-height:87px;padding:17px 20px;border:1px solid var(--line);background:#fff;color:var(--teal);text-decoration:none}.chapter-nav a:hover{border-color:#8db7a7}.chapter-nav .next{text-align:right}.chapter-nav small,.chapter-nav strong{display:block}.chapter-nav small{margin-bottom:7px;color:#718783;font-size:.7rem}.chapter-nav strong{font-size:.9rem}@media(max-width:760px){.inner-header nav{display:none}.chapter-main{padding:30px 0 58px}.chapter-shell{width:min(100% - 34px,760px)}.chapter-hero{padding:33px 24px}.chapter-article{padding:38px 0 14px;font-size:.95rem}.chapter-article h1{font-size:1.8rem}.chapter-article h2{margin-top:45px;font-size:1.48rem}.chapter-article h3{font-size:1.12rem}.chapter-nav{grid-template-columns:1fr}.chapter-nav .next{text-align:left}}
/* Visual hierarchy refinement */
:root{--sky:#e9f4f0;--soft-navy:#173f49;--soft-gold:#fff4d4;--accent-blue:#5aa5c7;--accent-green:#58ad86;--accent-orange:#e88a59;--accent-purple:#8371b9}
body{background:linear-gradient(180deg,#f7f7f2 0,#f7f7f2 92%,#e9f4f0 100%)}
.hero{border-bottom:9px solid var(--sun)}
.hero-content{position:relative}.hero-content:after{position:absolute;right:3%;top:46px;width:88px;height:88px;border:2px solid #8ce1b3;border-radius:50%;box-shadow:0 0 0 16px #8ce1b318;content:""}
.principles{position:relative;margin-top:0;background:#fff}.principles:before{position:absolute;top:0;left:50%;width:100vw;height:1px;background:var(--line);transform:translateX(-50%);content:""}
.section-intro{position:relative}.section-intro .eyebrow{position:relative;font-size:.73rem}.section-intro .eyebrow:after{display:block;width:34px;margin-top:14px;border-top:3px solid var(--mint);content:""}
.principle-grid article{position:relative;border-top:5px solid var(--teal);box-shadow:0 10px 24px #173f4909}.principle-grid article:nth-child(2){border-top-color:var(--accent-blue)}.principle-grid article:nth-child(3){border-top-color:var(--accent-orange)}
.path{border-top:1px solid #cce2d7;border-bottom:1px solid #cce2d7}.path-grid{border:1px solid #a8cfc0}.path-grid a{border-left:4px solid transparent}.path-grid a:nth-child(1){border-left-color:var(--accent-green)}.path-grid a:nth-child(2){border-left-color:var(--accent-orange)}.path-grid a:nth-child(3){border-left-color:var(--accent-purple)}
.curriculum{position:relative}.curriculum:before{position:absolute;top:70px;right:0;left:0;height:1px;background:var(--line);content:""}.curriculum-intro{position:relative;padding-bottom:34px}.curriculum-intro>p{padding:15px 0 15px 20px;border-left:3px solid var(--mint);font-weight:600}
.course-grid{gap:22px}.course-card{position:relative;overflow:hidden;border:1px solid #cbdcd5;border-top:6px solid var(--teal);box-shadow:0 10px 24px #173f4909;transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease}.course-card:nth-child(2){border-top-color:var(--accent-blue)}.course-card:nth-child(3){border-top-color:var(--accent-green)}.course-card:nth-child(4){border-top-color:var(--accent-orange)}.course-card:nth-child(5){border-top-color:var(--accent-purple)}.course-card:nth-child(6){border-top-color:#bf7f95}.course-card:nth-child(7){border-top-color:#6d9d93}.course-card:nth-child(8){border-top-color:#8c8552}.course-card:hover{transform:translateY(-5px);border-color:#91bbae;box-shadow:0 18px 32px #173f4918}.course-top{padding-bottom:14px;border-bottom:1px solid #dbe7e1}.course-top p{display:inline-block;padding:5px 8px;background:#eaf5ed;color:#155746;border-radius:3px;letter-spacing:.1em}.course-card h3{min-height:3.1em;margin-top:19px;color:#173f49;font-weight:600}.course-card>p{max-width:95%;font-size:.92rem}.tags{gap:8px}.tags span{border:1px solid #d6e8df;background:#f3f8f4}.read-link{align-items:center;min-height:43px;margin-top:19px;padding:12px 14px;border:0;background:#eaf5ed;color:#155746}.read-link span{font-size:1.15rem;transition:transform .2s ease}.course-card:hover .read-link{background:var(--teal);color:#fff}.course-card:hover .read-link span{transform:translateX(5px)}
.highlight{position:relative;border-top:8px solid #0a4749;border-bottom:8px solid #0a4749}.highlight h2{position:relative;padding-bottom:19px}.highlight h2:after{position:absolute;bottom:0;left:0;width:56px;border-top:4px solid var(--sun);content:""}.attention-panel{box-shadow:14px 14px 0 #0a4749}.attention-panel>div:first-of-type{border-top:3px solid #9dd8c5}
.safety{position:relative;padding-top:136px;padding-bottom:136px}.safety>div{padding:26px 0 26px 26px;border-left:6px solid var(--teal);background:#fff}.safety ol{background:#fff;box-shadow:0 10px 24px #173f4908}.safety li{padding:25px 24px}.safety li>span{display:grid;width:30px;height:30px;place-items:center;border-radius:50%;background:#e5f1e9;color:var(--teal);font-size:1rem;font-weight:700}.safety li:nth-child(2)>span{background:#e4f3f9;color:#287496}.safety li:nth-child(3)>span{background:#fff0e8;color:#b85d37}
.inner-header{position:sticky;top:0;z-index:10;box-shadow:0 4px 12px #173f4909}.inner-header>.shell{min-height:70px}.inner-header nav a{padding:8px 0;border-bottom:2px solid transparent}.inner-header nav a:hover{border-bottom-color:var(--mint)}
.chapter-main{background:linear-gradient(180deg,#edf5f0 0,#f7f7f2 420px)}.chapter-back a{display:inline-flex;padding:8px 12px;border:1px solid #b8d4c8;border-radius:999px;background:#fff}.chapter-back a:hover{background:#eaf5ed}.chapter-hero{position:relative;overflow:hidden;border-left:9px solid var(--sun);box-shadow:0 14px 30px #173f4922}.chapter-hero:after{position:absolute;right:-36px;bottom:-55px;width:180px;height:180px;border:1px solid #9ce2c5;border-radius:50%;box-shadow:0 0 0 20px #9ce2c51c;content:""}.chapter-hero>*{position:relative;z-index:1}.chapter-article{margin-top:24px;padding:62px 64px 38px;border:1px solid #d7e3dd;background:#fff;box-shadow:0 10px 28px #173f490d}.chapter-article h1{padding-bottom:16px;border-bottom:3px solid var(--teal)}.chapter-article h2{padding:14px 18px 15px;border-bottom:0;border-left:6px solid var(--teal);background:linear-gradient(90deg,#e8f3ed 0,#f8fbf8 100%);font-weight:600}.chapter-article h3{position:relative;padding-left:18px;color:#155746;font-weight:700}.chapter-article h3:before{position:absolute;top:.36em;left:0;width:8px;height:8px;border-radius:50%;background:var(--mint);content:""}.chapter-article h4{padding-bottom:7px;border-bottom:1px dashed #9fc3b4;color:#35675b}.chapter-article p{color:#293f45}.chapter-article blockquote{border-left-width:6px;box-shadow:inset 0 0 0 1px #cbe4d6}.chapter-article table{font-size:.9rem}.chapter-article th{border-bottom:2px solid #93c9ae;background:#dcefe4}.chapter-article tr:nth-child(even) td{background:#f7fbf8}.code-block,.mermaid-block{border-left:6px solid var(--accent-blue);box-shadow:0 8px 16px #173f4912}.mermaid-block{border-left-color:var(--accent-green)}.diagram-note{border-left:5px solid var(--sun);box-shadow:0 6px 14px #173f4908}.chapter-nav{gap:22px}.chapter-nav a{position:relative;border-top:5px solid var(--teal);box-shadow:0 8px 18px #173f490b}.chapter-nav .next{border-top-color:var(--accent-blue)}.chapter-nav a:hover{transform:translateY(-3px);box-shadow:0 13px 22px #173f4918}
@media(max-width:760px){.hero-content:after{right:0;top:22px;width:54px;height:54px}.principles{padding-top:86px}.curriculum:before{top:42px}.curriculum-intro{padding-bottom:23px}.course-grid{gap:16px}.course-card h3{min-height:0}.safety{padding-top:88px;padding-bottom:88px}.safety>div{padding:20px;border-left-width:5px}.chapter-article{padding:35px 23px 24px}.chapter-article h2{padding:12px 14px;font-size:1.4rem}.chapter-hero{border-left-width:6px}.chapter-nav{gap:12px}}
/* Hero contact link */
.hero-contact {
  margin: 20px 0 0;
  color: #d5e7e2;
  font-size: clamp(1rem, 1.8vw, 1.18rem);
  font-weight: 700;
  letter-spacing: .03em;
}

.hero-contact a {
  color: #a7ecc8;
  font-weight: 800;
  text-decoration-thickness: 2px;
  text-underline-offset: 5px;
}

.hero-contact a:hover {
  color: #ffffff;
}
/* AI Classroom access counter */
.access-counter {
  display: block;
  margin-top: 5px;
  color: var(--teal);
  font-size: 1.08em;
  font-weight: 800;
  letter-spacing: .05em;
}
/* Chapter body readability */
.chapter-article {
  font-size: 1.0625rem;
}

@media (max-width: 760px) {
  .chapter-article {
    font-size: 1rem;
  }
}

/* Main site return logo */
.main-home-link {
  display: inline-flex;
  flex: 0 0 126px;
  width: 126px;
  height: 38px;
  align-items: center;
  justify-content: center;
  padding: 4px 8px;
  border-radius: 4px;
  background: transparent;
  text-decoration: none;
}

.main-home-link:hover {
  background: transparent;
  box-shadow: 0 0 0 2px #a7ecc8;
}

.main-home-logo {
  display: block;
  width: auto;
  height: auto;
  max-width: 100%;
  max-height: 100%;
}

.site-header .brand,
.inner-header .inner-brand {
  margin-right: auto;
  margin-left: 18px;
}

@media (max-width: 760px) {
  .site-header .brand,
  .inner-header .inner-brand {
    margin-left: 10px;
  }
}