/* ===========================================================
   course.css — shared stylesheet for the Cerruti 1881 lesson plans
   Paper & Ink (warm) · identical tokens to training.sunovation.ai
   =========================================================== */
:root {
    --cream:        #faf7f2;
    --ink:          #262019;
    --ink-soft:     rgba(38, 32, 25, .82);
    --ink-mute:     rgba(38, 32, 25, .64);
    --ink-faint:    rgba(38, 32, 25, .16);
    --ink-hairline: rgba(38, 32, 25, .10);
    --crimson:      #d97757;
    --crimson-ink:  #b4552f;
    --crimson-soft: rgba(217, 119, 87, .13);
    --crimson-line: rgba(217, 119, 87, .5);

    --serif-cjk: "Noto Serif SC", "Songti SC", "SimSun", serif;
    --serif-lat: "Cormorant Garamond", var(--serif-cjk);
    --sans-cjk:  "Noto Sans SC", "Microsoft YaHei", "PingFang SC", sans-serif;
    --mono:      ui-monospace, "SFMono-Regular", "Cascadia Mono", Consolas, monospace;

    --t-h1:    clamp(2rem, 6.2vw, 4.4rem);
    --t-h2:    clamp(1.3rem, 3.3vw, 2.3rem);
    --t-h3:    clamp(1rem, 2.1vw, 1.5rem);
    --t-latin: clamp(.95rem, 2.1vw, 1.6rem);
    --t-lead:  clamp(.86rem, 1.7vw, 1.22rem);
    --t-body:  clamp(.78rem, 1.4vw, 1.02rem);
    --t-small: clamp(.68rem, 1.08vw, .88rem);
    --t-meta:  clamp(.56rem, .92vw, .74rem);

    --pad: clamp(1.1rem, 4.4vw, 4.2rem);
    --gap-sm: clamp(.28rem, .9vh, .6rem);
    --ease: cubic-bezier(.16, 1, .3, 1);
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    font-family: var(--serif-cjk);
    color: var(--ink);
    background-color: var(--cream);
    background-image:
        repeating-linear-gradient(0deg,  rgba(38,32,25,.013) 0 1px, transparent 1px 3px),
        repeating-linear-gradient(90deg, rgba(38,32,25,.013) 0 1px, transparent 1px 3px),
        radial-gradient(ellipse at 16% 4%,  rgba(217,119,87,.045), transparent 55%),
        radial-gradient(ellipse at 92% 98%, rgba(38,32,25,.05),  transparent 60%);
    background-attachment: fixed;
    -webkit-font-smoothing: antialiased;
    line-height: 1.6;
}

/* ---- i18n: one language at a time ---- */
body[data-lang="zh"] .fr, body[data-lang="zh"] .en,
body[data-lang="fr"] .zh, body[data-lang="fr"] .en,
body[data-lang="en"] .zh, body[data-lang="en"] .fr { display: none !important; }

.fr { font-family: var(--serif-lat); font-style: italic; }
.en { font-style: normal; }
h1 .fr, h2 .fr, h3 .fr, .ttl .fr, h1 .en, h2 .en, h3 .en, .ttl .en { font-family: var(--serif-lat); font-weight: 700; }
h1 .en, h2 .en, h3 .en, .ttl .en { font-style: normal; }
h1 .fr, h2 .fr, h3 .fr, .ttl .fr { font-style: italic; }

/* ---- nav ---- */
.nav {
    position: sticky; top: 0; z-index: 50;
    display: flex; justify-content: space-between; align-items: center; gap: 1rem;
    padding: clamp(.6rem, 1.6vh, 1rem) var(--pad);
    font-family: var(--sans-cjk); font-size: var(--t-meta); letter-spacing: .14em; color: var(--ink-mute);
    background: rgba(250, 247, 242, .86); backdrop-filter: saturate(140%) blur(8px);
    border-bottom: 1px solid var(--ink-hairline);
}
.nav .brand b { font-family: var(--serif-lat); font-weight: 700; color: var(--crimson-ink); letter-spacing: .1em; }
.nav .links { display: flex; gap: clamp(.5rem,1.6vw,1.3rem); }
.nav a { color: var(--ink-mute); text-decoration: none; white-space: nowrap; }
.nav a:hover { color: var(--crimson-ink); }
.langswitch { margin-left: auto; display: flex; gap: .3rem; }
.langswitch button {
    font-family: var(--sans-cjk); font-size: var(--t-meta); font-weight: 700; letter-spacing: .1em;
    color: var(--ink-mute); background: transparent; cursor: pointer;
    border: 1px solid var(--ink-faint); padding: .3em .7em; line-height: 1;
}
.langswitch button:hover { color: var(--crimson-ink); border-color: var(--crimson-line); }
.langswitch button.on { color: #fff; background: var(--crimson-ink); border-color: var(--crimson-ink); }
@media (max-width: 820px) { .nav .links { display: none; } }

/* ---- layout ---- */
main { width: min(100%, 1120px); margin: 0 auto; }
section.page { padding: clamp(2.4rem, 7vh, 5.4rem) var(--pad); border-bottom: 1px solid var(--ink-hairline); }
section.page:last-of-type { border-bottom: none; }

.kicker {
    font-family: var(--sans-cjk); font-weight: 700; font-size: var(--t-meta);
    letter-spacing: .3em; color: var(--crimson-ink);
    display: flex; align-items: center; gap: clamp(.45rem,1.1vw,.9rem);
    margin-bottom: clamp(.8rem,2.2vh,1.4rem);
}
.kicker::before { content: ""; flex: none; width: clamp(5px,.68vw,8px); height: clamp(5px,.68vw,8px); background: var(--crimson); transform: rotate(45deg); }

h1 { font-family: var(--serif-cjk); font-weight: 900; font-size: var(--t-h1); line-height: 1.12; }
h1 em { font-style: normal; color: var(--crimson); }
h2 { font-family: var(--serif-cjk); font-weight: 900; font-size: var(--t-h2); line-height: 1.22; }
h3 { font-family: var(--serif-cjk); font-weight: 900; font-size: var(--t-h3); line-height: 1.28; }
.ttl { font-family: var(--serif-cjk); font-weight: 900; font-size: var(--t-h3); line-height: 1.25; }
.lead { font-size: var(--t-lead); line-height: 1.85; color: var(--ink-soft); max-width: 60ch; }
.lead b { color: var(--ink); font-weight: 700; }
.lead.small { font-size: var(--t-body); }
.rule-mid { position: relative; height: 1px; background: var(--ink-faint); width: min(52vw,460px); margin: clamp(1rem,3vh,2rem) 0; }
.rule-mid::after { content: ""; position: absolute; left: 50%; top: 50%; width: clamp(26px,4.6vw,60px); height: 3px; background: var(--crimson); transform: translate(-50%,-50%); }

/* ---- session meta strip ---- */
.meta-strip { display: flex; flex-wrap: wrap; gap: .45em .6em; list-style: none; margin-top: 1rem; }
.meta-strip li {
    font-family: var(--sans-cjk); font-size: var(--t-small); color: var(--ink-soft);
    border: 1px solid var(--ink-faint); background: rgba(255,255,255,.5); padding: .32em .8em;
}
.meta-strip li b { font-family: var(--serif-lat); font-weight: 700; color: var(--crimson-ink); font-size: 1.08em; }

/* ---- cover, facts and module cards (same language as the overview) ---- */
.subline { font-family: var(--serif-lat); font-style: italic; font-weight: 600; font-size: var(--t-latin); color: var(--ink-soft); margin-top: .5rem; }
.subline.plain { font-family: var(--sans-cjk); font-style: normal; font-size: var(--t-body); color: var(--ink-mute); letter-spacing: .03em; }

.cover { min-height: 78vh; display: flex; flex-direction: column; justify-content: center; }
.facts { margin-top: clamp(1.4rem,4vh,2.6rem); display: grid; grid-template-columns: repeat(auto-fit, minmax(140px,1fr)); gap: clamp(.6rem,1.6vw,1.1rem); }
.fact { border-top: 2px solid var(--crimson); padding-top: .6rem; }
.fact b { display: block; font-family: var(--serif-lat); font-weight: 700; font-size: var(--t-h2); color: var(--ink); line-height: 1; }
.fact span { font-family: var(--sans-cjk); font-size: var(--t-meta); letter-spacing: .1em; color: var(--ink-mute); display: block; margin-top: .35rem; }

.grid-modules { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%,300px),1fr)); gap: clamp(.7rem,1.8vw,1.3rem); margin-top: clamp(1.2rem,3vh,2rem); }
.mod {
    border: 1px solid var(--ink-faint); border-top: 2px solid var(--ink);
    background: rgba(255,255,255,.5); padding: clamp(.8rem,2.2vw,1.4rem);
    display: flex; flex-direction: column; gap: var(--gap-sm); min-width: 0;
}
.mod.accent { border-top-color: var(--crimson); background: var(--crimson-soft); }
.mod .no { font-family: var(--serif-lat); font-weight: 700; font-style: italic; font-size: var(--t-h2); color: rgba(217,119,87,.4); line-height: .9; }
.mod p { font-family: var(--sans-cjk); font-size: var(--t-small); line-height: 1.55; color: var(--ink-soft); }
.mod .hrs { font-family: var(--sans-cjk); font-size: var(--t-meta); letter-spacing: .12em; color: var(--ink-mute); margin-top: auto; padding-top: .6rem; border-top: 1px solid var(--ink-hairline); }
.mod ul.topics { margin-top: .2rem; }

.topics { list-style: none; display: flex; flex-direction: column; gap: .42rem; }
.topics li { font-family: var(--sans-cjk); font-size: var(--t-body); line-height: 1.5; color: var(--ink-soft); padding-left: 1.1em; position: relative; }
.topics li::before { content: ""; position: absolute; left: 0; top: .62em; width: 5px; height: 5px; background: var(--crimson); transform: rotate(45deg); }

.deliv { display: grid; grid-template-columns: repeat(auto-fit,minmax(min(100%,240px),1fr)); gap: clamp(.6rem,1.6vw,1rem); margin-top: clamp(.8rem,2vh,1.4rem); }
.deliv .d { border: 1px solid var(--ink-faint); background: var(--crimson-soft); padding: .65rem .85rem; }
.deliv .d .lab { font-family: var(--sans-cjk); font-size: var(--t-meta); letter-spacing: .16em; color: var(--crimson-ink); font-weight: 700; display: block; margin-bottom: .3rem; }
.deliv .d .txt { font-family: var(--sans-cjk); font-size: var(--t-small); color: var(--ink-soft); line-height: 1.5; }

.peda { display: grid; grid-template-columns: repeat(auto-fit,minmax(min(100%,220px),1fr)); gap: clamp(.7rem,1.8vw,1.2rem); margin-top: clamp(1.2rem,3vh,2rem); }
.peda .p { border-top: 2px solid var(--ink); padding-top: .6rem; }
.peda .p b { display: block; font-family: var(--serif-lat); font-weight: 700; font-size: var(--t-h2); color: var(--crimson); line-height: 1; }
.peda .p span { font-family: var(--sans-cjk); font-size: var(--t-small); color: var(--ink-soft); line-height: 1.5; display: block; margin-top: .4rem; }

@media (max-width: 640px) { .facts { grid-template-columns: repeat(2, 1fr); } }

/* ---- tables (timeline etc.) ---- */
.tbl-wrap { overflow-x: auto; margin-top: clamp(.8rem,2.4vh,1.4rem); }
.tbl { width: 100%; border-collapse: collapse; font-family: var(--sans-cjk); }
.tbl th, .tbl td { text-align: left; padding: clamp(.4rem,1.1vh,.75rem) clamp(.5rem,1.2vw,.9rem); border-bottom: 1px solid var(--ink-hairline); font-size: var(--t-body); line-height: 1.45; vertical-align: top; }
.tbl th { font-size: var(--t-meta); letter-spacing: .14em; color: var(--ink-mute); border-bottom: 1px solid var(--ink-faint); text-transform: uppercase; font-weight: 700; }
.tbl tr:hover td { background: rgba(217,119,87,.05); }
.tbl td.time { font-family: var(--serif-lat); font-weight: 700; font-style: italic; color: var(--crimson-ink); white-space: nowrap; }
.tbl td.dur { font-family: var(--serif-lat); font-weight: 700; color: var(--ink-mute); white-space: nowrap; }

/* ---- type badges ---- */
.badge {
    display: inline-block; font-family: var(--sans-cjk); font-size: var(--t-meta); font-weight: 700;
    letter-spacing: .1em; padding: .18em .6em; border: 1px solid var(--ink-faint); color: var(--ink-mute);
    white-space: nowrap;
}
.badge.theory { color: var(--ink-soft); border-color: var(--ink-faint); background: rgba(255,255,255,.6); }
.badge.case   { color: var(--crimson-ink); border-color: var(--crimson-line); background: var(--crimson-soft); }
.badge.lab    { color: #fff; background: var(--crimson-ink); border-color: var(--crimson-ink); }
.badge.exam   { color: var(--ink); border-color: var(--ink-mute); background: rgba(38,32,25,.06); }
.badge.break  { color: var(--ink-mute); border-color: var(--ink-hairline); }

/* ---- content blocks ---- */
.block { margin-top: clamp(1.6rem,4vh,2.6rem); }
.block > h3 { display: flex; align-items: baseline; gap: .7em; flex-wrap: wrap; }
.block > h3 .no { font-family: var(--serif-lat); font-weight: 700; font-style: italic; color: var(--crimson); font-size: 1.5em; line-height: 1; }

ul.points { list-style: none; display: flex; flex-direction: column; gap: .5rem; margin-top: .9rem; }
ul.points li { font-family: var(--sans-cjk); font-size: var(--t-body); line-height: 1.6; color: var(--ink-soft); padding-left: 1.15em; position: relative; }
ul.points li::before { content: ""; position: absolute; left: 0; top: .62em; width: 5px; height: 5px; background: var(--crimson); transform: rotate(45deg); }
ul.points li b { color: var(--ink); font-weight: 700; }

/* case card */
.case {
    border: 1px solid var(--ink-faint); border-left: 3px solid var(--crimson);
    background: rgba(255,255,255,.5); padding: clamp(.8rem,2.2vw,1.3rem); margin-top: .9rem;
}
.case .ttl { margin-bottom: .4rem; }
.case p { font-family: var(--sans-cjk); font-size: var(--t-body); line-height: 1.65; color: var(--ink-soft); }

/* hands-on steps */
ol.steps { list-style: none; counter-reset: s; display: flex; flex-direction: column; gap: .6rem; margin-top: .9rem; }
ol.steps > li {
    counter-increment: s; position: relative; padding-left: 2.3em;
    font-family: var(--sans-cjk); font-size: var(--t-body); line-height: 1.6; color: var(--ink-soft);
}
ol.steps > li::before {
    content: counter(s); position: absolute; left: 0; top: .05em;
    font-family: var(--serif-lat); font-weight: 700; font-style: italic; font-size: 1.15em;
    color: var(--crimson-ink); width: 1.6em; text-align: right;
}
ol.steps > li b { color: var(--ink); font-weight: 700; }

/* Copilot prompt blocks */
.prompt {
    margin: .5rem 0 .2rem; border: 1px solid var(--crimson-line); border-left: 3px solid var(--crimson);
    background: rgba(255,255,255,.62); padding: .6rem .8rem;
    font-family: var(--mono); font-size: var(--t-small); line-height: 1.6; color: var(--ink);
    white-space: pre-wrap; word-break: break-word;
}
.prompt + .prompt { margin-top: .45rem; }
.prompt .who { display: block; font-family: var(--sans-cjk); font-size: var(--t-meta); letter-spacing: .12em; color: var(--crimson-ink); font-weight: 700; margin-bottom: .3em; }

/* compliance / warning callout */
.note {
    border: 1px solid var(--ink-faint); border-top: 2px solid var(--ink);
    background: var(--crimson-soft); padding: clamp(.8rem,2.2vw,1.2rem); margin-top: .9rem;
}
.note .ttl { margin-bottom: .35rem; }
.note p, .note li { font-family: var(--sans-cjk); font-size: var(--t-body); line-height: 1.6; color: var(--ink-soft); }

/* checklist */
ul.check { list-style: none; display: flex; flex-direction: column; gap: .4rem; margin-top: .8rem; }
ul.check li { font-family: var(--sans-cjk); font-size: var(--t-body); color: var(--ink-soft); padding-left: 1.5em; position: relative; line-height: 1.55; }
ul.check li::before { content: "✓"; position: absolute; left: 0; color: var(--crimson-ink); font-weight: 700; }

/* deliverable / assessment cards */
.cards { display: grid; grid-template-columns: repeat(auto-fit,minmax(min(100%,240px),1fr)); gap: clamp(.6rem,1.6vw,1rem); margin-top: 1rem; }
.card { border: 1px solid var(--ink-faint); background: rgba(255,255,255,.5); padding: .7rem .9rem; }
.card.accent { background: var(--crimson-soft); }
.card .lab { font-family: var(--sans-cjk); font-size: var(--t-meta); letter-spacing: .16em; color: var(--crimson-ink); font-weight: 700; display: block; margin-bottom: .3rem; }
.card .txt { font-family: var(--sans-cjk); font-size: var(--t-small); color: var(--ink-soft); line-height: 1.55; }

/* chips */
.chips { display: flex; flex-wrap: wrap; gap: .45em .55em; list-style: none; margin-top: .9rem; }
.chips li { font-family: var(--sans-cjk); font-size: var(--t-small); color: var(--ink-soft); border: 1px solid var(--ink-faint); padding: .3em .8em; background: rgba(255,255,255,.4); }
.chips li.solid { color: var(--crimson-ink); border-color: var(--crimson-line); background: var(--crimson-soft); font-weight: 500; }

/* session divider */
.session-head { margin-top: clamp(2.2rem,6vh,3.6rem); padding-top: clamp(1rem,3vh,1.6rem); border-top: 2px solid var(--ink); }
.session-head .when { font-family: var(--serif-lat); font-weight: 700; font-style: italic; font-size: var(--t-latin); color: var(--crimson-ink); }

/* footer */
.foot {
    display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; flex-wrap: wrap;
    padding: clamp(1rem,3vh,1.8rem) var(--pad); border-top: 1px solid var(--ink-hairline);
    font-family: var(--sans-cjk); font-size: var(--t-meta); letter-spacing: .14em; color: var(--ink-mute);
}
.foot b { font-family: var(--serif-lat); font-weight: 700; color: var(--crimson-ink); letter-spacing: .1em; }

/* reveal */
.reveal { opacity: 0; transform: translateY(clamp(10px,2.4vh,24px)); transition: opacity .8s var(--ease), transform .8s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .15s !important; }
    html { scroll-behavior: auto; }
    .reveal { opacity: 1; transform: none; }
}
@media print {
    .nav { display: none; }
    body { background: #fff; }
    section.page { break-inside: avoid; padding: 1.2rem 0; }
    .reveal { opacity: 1 !important; transform: none !important; }
    .prompt { white-space: pre-wrap; }
    a { color: inherit; text-decoration: none; }
}