/* Midnight blue, warm metal accents and a quiet daylight companion. */
:root{--bg:#091427;--panel:#11213b;--text:#f2f5fc;--muted:#a8b8cf;--line:#8eaacf29;--orange:#ff9a63;--gold:#dac39b;--surface:#0d1c33;--shadow:0 20px 65px #02081555;color-scheme:dark}
:root[data-theme=light]{--bg:#f4f6fb;--panel:#fff;--surface:#eaf0f9;--text:#152642;--muted:#52647d;--line:#203d6926;--orange:#ae461c;--gold:#896128;--shadow:0 20px 65px #233d6c12;color-scheme:light}
body{background:radial-gradient(ellipse at 85% 5%,#497ec015,transparent 38%),var(--bg)}
.site-header{position:sticky;top:16px;max-width:1280px;margin:22px auto 0;padding:18px 25px;border:1px solid var(--line);border-top-color:color-mix(in srgb,var(--gold) 45%,transparent);border-radius:18px;background:color-mix(in srgb,var(--panel) 90%,transparent);backdrop-filter:blur(22px);box-shadow:var(--shadow);gap:20px}
.site-header:after{content:"";position:absolute;bottom:-1px;left:28px;right:28px;height:1px;background:linear-gradient(90deg,transparent,var(--gold),transparent);opacity:.35;pointer-events:none}
.brand-mark{text-shadow:0 0 22px #ff9a6325}.domain{color:var(--muted)}
.site-header nav{gap:25px}.site-header nav>a{color:var(--muted)}.site-header nav>a:hover,.site-header nav>a[aria-current]{color:var(--text)}
.site-header nav .nav-contact{border-color:var(--line);color:var(--text);margin-left:0;border-radius:9px;background:var(--surface)}
.theme-toggle{display:flex;align-items:center;gap:7px;white-space:nowrap;margin-left:auto;border:1px solid var(--line);border-radius:30px;background:transparent;color:var(--text);padding:9px 12px;font-size:10px;min-height:40px}.theme-toggle>span:first-child{font-size:19px;line-height:1;color:var(--gold)}.theme-toggle:hover{background:var(--surface)}
.home-hero{padding-top:90px}.orb-stage{background:radial-gradient(ellipse at 55% 50%,#3e79c526,transparent 63%)}
.orb-caption strong,.experience-generations strong,.footer-top p{color:var(--gold)}
.eyebrow,.orb-coordinate,.orb-axis,.hero-bottom,.orb-caption span{color:var(--muted)}
.hero-bottom a,.language-ribbon,.semester-note strong,.topic-list li,.breadcrumb a{color:var(--text)}
.language-ribbon{padding:30px 0}.language-ribbon i{color:var(--gold)}
.course-card,.format-card,.format-group,.contact-form,.subject-note,.quiz-panel,.quiz-board,.quiz-dialog,.about-monogram{background:linear-gradient(135deg,var(--panel),var(--surface));border-color:var(--line);box-shadow:0 12px 40px #0000000a;border-radius:16px}
.course-card{--art:var(--orange)}.art-data{--art:#9ecfbf}.art-ai{--art:#c0b5f4}.art-web{--art:#96c9ec}.art-apps{--art:#e1c48c}
.course-card:hover{border-color:var(--gold);box-shadow:var(--shadow)}.course-card-main{border-radius:16px}.course-card-main:after{content:"";position:absolute;top:0;left:24px;right:24px;height:1px;background:linear-gradient(90deg,transparent,var(--gold),transparent);opacity:.45}
.course-card p,.card-category,.course-card-top,.card-bottom,.format-number,.experience-row>div>span,.recording-section small,.source-note,.contact-recording,.contact-details>a:last-child,.catalog-count,.quiz-muted,.quiz-hero p,.quiz-faq>p{color:var(--muted)}
.art-orbit,.card-arrow,.card-bottom,.quiz-rules,.quiz-rules>div,.quiz-board li,.quiz-session-meta span{border-color:var(--line)}
.invitation{background:radial-gradient(ellipse at 90% 100%,#3871b82b,transparent 60%),var(--panel);border-color:color-mix(in srgb,var(--gold) 45%,transparent);border-radius:20px;box-shadow:var(--shadow)}
.invitation .eyebrow,.invitation-phone,.footer-bottom,.footer-bottom a{color:var(--muted)}
.contact-details>a:nth-child(2),.footer-top>div>a:first-child{color:var(--gold)}
.contact-form label,.format-choice legend,.quiz-dialog,.quiz-question-top,.quiz-score-line{color:var(--text)}
.catalog-controls input,.catalog-controls select,.contact-form input:not([type=radio]),.contact-form select,.contact-form textarea,.quiz-layout input,.quiz-layout select,.quiz-dialog input{background:var(--bg);color:var(--text);border-color:var(--line);border-radius:8px}
input::placeholder,textarea::placeholder{color:var(--muted)}.faculty-tabs button{color:var(--muted);border-color:var(--line)}
.button{border-radius:9px;background:linear-gradient(120deg,#ffb17b,#ff8a55);border-color:#ffc09688;color:#152139;box-shadow:0 6px 24px #ff9a6312}.button:hover{background:#ffc195}
.button-outline{background:transparent;color:var(--text);border-color:var(--line);box-shadow:none}.button-outline:hover{background:var(--panel)}
.quiz-art{background:radial-gradient(ellipse at center,#477cca30,transparent 65%),var(--surface);border-color:var(--line);border-radius:22px}.quiz-art-ticket{background:var(--panel);border-color:var(--gold);border-radius:8px}.quiz-art-label{color:var(--muted)}
.quiz-panel label.quiz-option{border-color:var(--line);border-radius:10px}.quiz-feedback{background:var(--surface);border-radius:8px}.quiz-progress{background:var(--line)}.quiz-dialog-close{color:var(--muted)}
.quiz-layout input[type=radio]{background:unset}.quiz-status,#quiz-auth-status{color:var(--gold)}
.menu-toggle{color:var(--text)}
.real-example,.recursion-example{background:linear-gradient(135deg,var(--panel),var(--surface));border-color:var(--line);border-radius:16px}.guide-intro>p,.example-scenario,.example-steps p,.example-result p,.example-disclaimer,.student-question>p{color:var(--muted)}.example-result strong,.student-question summary,.student-question[open] summary{color:var(--text)}.example-heading .eyebrow,.example-label{color:var(--gold)}
:root[data-theme=light] .orb-core{color:var(--orange)}
:root[data-theme=light] .course-card{--art:#ae461c}:root[data-theme=light] .art-data{--art:#276653}:root[data-theme=light] .art-ai{--art:#7050a8}:root[data-theme=light] .art-web{--art:#27628e}:root[data-theme=light] .art-apps{--art:#876119}
:root[data-theme=light] .quiz-hero h1 em,:root[data-theme=light] .quiz-panel h2 em,:root[data-theme=light] .quiz-faq h2 em{color:var(--orange)}
:root[data-theme=light] .experience-row strong span,:root[data-theme=light] .format-card .text-link,:root[data-theme=light] .source-note a,:root[data-theme=light] .format-choice label>span,:root[data-theme=light] .contact-form>.eyebrow,:root[data-theme=light] .quiz-session-meta span{color:var(--muted)}
:root[data-theme=light] .about-monogram>div>strong,:root[data-theme=light] .about-monogram>.eyebrow,:root[data-theme=light] .monogram{color:var(--gold)}
:root[data-theme=light] .learning-example,:root[data-theme=light] .learning-question,:root[data-theme=light] .recursion-example,:root[data-theme=light] .recursion-output,:root[data-theme=light] .recursion-exercise{background:var(--panel);border-color:var(--line);color:var(--text)}
:root[data-theme=light] .learning-guide p,:root[data-theme=light] .learning-guide li,:root[data-theme=light] .learning-guide h3,:root[data-theme=light] .learning-guide strong,:root[data-theme=light] .recursion-scenario,:root[data-theme=light] .recursion-rules p,:root[data-theme=light] .recursion-note,:root[data-theme=light] .recursion-exercise p,:root[data-theme=light] .recursion-exercise strong{color:var(--muted)}
/* Code terminals retain their dark surface for syntax readability in both modes. */
.code-lab,.recording-frame,.recursion-code-wrap{box-shadow:var(--shadow)}
@media(max-width:1200px){.site-header{margin:16px 24px 0;padding:16px 20px}.site-header nav{gap:17px}.site-header .brand{font-size:20px}.theme-toggle{padding:8px 10px}}
@media(max-width:1000px){.site-header{gap:12px}.site-header nav{gap:12px;font-size:11px}.site-header nav .nav-contact{padding:9px 12px}.nav-contact span{margin-left:8px}.theme-toggle>span:last-child{display:none}}
@media(max-width:800px){.site-header{top:10px;margin:12px 16px 0;padding:14px 18px;border-radius:14px;flex-wrap:wrap}.theme-toggle{margin-left:auto;order:1}.menu-toggle{order:2;display:block;background:transparent;border:0;font-size:11px;padding:10px 0}.site-header nav{order:3;display:none;width:100%;flex-direction:column;align-items:stretch;padding:16px 0 4px;gap:5px;border-top:1px solid var(--line);background:transparent;position:static}.site-header nav.open{display:flex}.site-header nav>a{padding:10px 12px}.site-header nav .nav-contact{margin:4px 0}.home-hero{padding-top:55px}.site-header .brand{font-size:19px}.brand-mark{font-size:30px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.course-card,.button{transition:none}}