/* =============================================================
   College instructor landing page (/instructors)
   Scoped under the .ins- prefix. Translates the approved
   "unQbd Instructors Page" Claude Design: brand tokens on .ins-shell,
   desktop layout first, a <900px block for phones, and a dark-mode
   token remap on the site's html/body .dark-mode class.
   ============================================================= */

.ins-shell {
    --ins-step-build: #A86A00;
    --ins-step-check: #0B6E99;
    --ins-blue: #00B4FF;
    --ins-blue-deep: #0174B1;
    --ins-tint: #F6FBFF;
    --ins-orange: #FFAA00;
    --ins-ink: #222222;
    --ins-ink-2: #4A5560;
    --ins-muted: #6B7680;
    --ins-surface: #FFFFFF;
    --ins-border: #DCEBF5;
    --ins-code-bg: #0F1A26;
    --ins-code-ink: #E6F1FA;
    --ins-radius: 18px;
    --ins-shadow: 0 10px 30px rgba(2, 6, 23, .08);
    --ins-maxw: 1160px;
    --ins-font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --ins-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

    background: var(--ins-surface);
    color: var(--ins-ink);
    font-family: var(--ins-font);
    overflow-x: clip;
}

.ins-wrap { max-width: var(--ins-maxw); margin: 0 auto; padding: 0 24px; }
.ins-section { padding: 72px 0; }
.ins-tinted { background: var(--ins-tint); }
.ins-two { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.ins-center { text-align: center; }
.ins-mono { font-family: var(--ins-mono); }

.ins-shell h1, .ins-shell h2, .ins-shell h3 { color: var(--ins-ink); letter-spacing: -.02em; }
.ins-shell h2 { font-size: clamp(1.8rem, 3vw, 2.5rem); font-weight: 800; margin: 0 0 16px; }
.ins-shell h3 { font-size: 1.15rem; font-weight: 700; margin: 0 0 8px; }
.ins-shell p { color: var(--ins-ink-2); line-height: 1.6; }
.ins-shell code { font-family: var(--ins-mono); font-size: .92em; color: var(--ins-blue-deep); }

.ins-eyebrow { color: var(--ins-blue-deep) !important; font-weight: 600; font-size: .95rem; margin: 0 0 12px; }
.ins-eyebrow::before { content: ""; display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--ins-orange); margin-right: 8px; vertical-align: middle; }
.ins-accent { color: var(--ins-blue); }
.ins-fine { font-size: .9rem; color: var(--ins-muted) !important; }

.ins-btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    min-height: 48px; padding: 12px 22px; border-radius: 12px; border: 2px solid var(--ins-blue);
    background: var(--ins-blue); color: #08131C; font-weight: 700; text-decoration: none; cursor: pointer;
    box-shadow: 0 8px 22px rgba(0, 180, 255, .25);
}
.ins-btn:hover, .ins-btn:focus-visible { background: #33C3FF; color: #08131C; }
.ins-btn:disabled { opacity: .6; cursor: default; }
.ins-btn-ghost { background: var(--ins-surface); color: var(--ins-blue-deep); box-shadow: none; }
.ins-btn-ghost:hover, .ins-btn-ghost:focus-visible { background: var(--ins-tint); color: var(--ins-blue-deep); }

/* ---------- hero ---------- */
/* Top pad clears the global fixed top nav, the same offset /kids uses. */
.ins-hero { padding: calc(136px + var(--topnav-inset-top, 0px)) 0 48px; background: radial-gradient(1200px 500px at 85% 20%, #E3F6FF 0%, rgba(227, 246, 255, 0) 70%); }
.ins-hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 40px; align-items: center; }
.ins-hero h1 { font-size: clamp(2.4rem, 5vw, 4rem); font-weight: 800; line-height: 1.05; margin: 0 0 20px; }
.ins-lede { font-size: 1.2rem; max-width: 34em; }
.ins-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0 12px; }
.ins-hero-visual { position: relative; display: flex; justify-content: flex-end; }
.ins-hero-book { width: min(420px, 100%); height: auto; filter: drop-shadow(0 24px 40px rgba(2, 6, 23, .22)); }

/* Shared labels for the full lesson below the hero. */
.ins-mini-title { font-weight: 700; color: var(--ins-ink) !important; margin: 0 0 10px; }
.ins-step { display: block; font-weight: 700; font-size: .74rem; letter-spacing: .08em; text-transform: uppercase; margin: 0 0 2px; }
.ins-shell .ins-step-explain { color: var(--ins-blue-deep); }
.ins-shell .ins-step-build { color: var(--ins-step-build); }
.ins-shell .ins-step-check { color: var(--ins-step-check); }

/* ---------- proof strip ---------- */
.ins-proof {
    list-style: none; margin: 8px 0 0; padding: 18px 24px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
    background: var(--ins-tint); border: 1px solid var(--ins-border); border-radius: var(--ins-radius);
}
.ins-proof li { font-weight: 600; color: var(--ins-ink); padding-left: 26px; position: relative; }
.ins-proof li::before { content: "\2713"; position: absolute; left: 0; color: var(--ins-blue-deep); font-weight: 800; }

/* ---------- course fit ---------- */
.ins-callout { margin-top: 24px; padding: 22px; border: 1px solid var(--ins-border); border-radius: var(--ins-radius); background: var(--ins-surface); box-shadow: var(--ins-shadow); }
.ins-callout-title { font-weight: 700; color: var(--ins-ink) !important; font-size: 1.1rem; margin: 0 0 8px; }
.ins-callout a, .ins-book a { color: var(--ins-blue-deep); font-weight: 700; }
.ins-chapters { margin: 0; }
.ins-chapters > div { display: grid; grid-template-columns: 90px 1fr; gap: 12px; padding: 14px 0; border-bottom: 1px solid var(--ins-border); }
.ins-chapters dt { color: var(--ins-blue-deep); font-weight: 700; font-family: var(--ins-mono); font-size: .9rem; }
.ins-chapters dd { margin: 0; color: var(--ins-ink); }

/* ---------- inside every chapter ---------- */
.ins-steps { margin: 0; padding: 0; list-style: none; counter-reset: ins-step; }
.ins-steps li { counter-increment: ins-step; padding: 14px 0; border-bottom: 1px solid var(--ins-border); font-weight: 600; color: var(--ins-ink); }
.ins-steps li::before { content: "0" counter(ins-step); color: var(--ins-blue-deep); font-family: var(--ins-mono); margin-right: 16px; }
.ins-lesson { padding: 24px; border: 1px solid var(--ins-border); border-radius: var(--ins-radius); background: var(--ins-surface); box-shadow: var(--ins-shadow); min-width: 0; }
.ins-lesson-step { padding: 10px 0 10px 16px; border-left: 2px solid var(--ins-border); margin-bottom: 8px; }
.ins-lesson-step p { margin: 4px 0; }
.ins-code { margin: 10px 0 0; padding: 12px 14px; border-radius: 10px; background: var(--ins-tint); border: 1px solid var(--ins-border); overflow-x: auto; font-size: .85rem; }
.ins-code code { color: var(--ins-ink); white-space: pre; }
.ins-code-dark { background: var(--ins-code-bg); border-color: var(--ins-code-bg); }
.ins-code-dark code { color: var(--ins-code-ink); }
.ins-output code { color: #7FD3FF; }
.ins-quiz { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 10px; }
.ins-quiz-choice { min-height: 44px; border: 1px solid var(--ins-border); border-radius: 10px; background: var(--ins-surface); font-family: var(--ins-mono); color: var(--ins-ink); cursor: pointer; }
.ins-quiz-choice:hover, .ins-quiz-choice:focus-visible { border-color: var(--ins-blue); }
.ins-quiz-picked { border: 2px solid var(--ins-blue); background: var(--ins-tint); }
.ins-quiz-feedback { margin-top: 10px !important; font-weight: 600; color: var(--ins-ink) !important; }
.ins-back { margin-top: 24px; padding: 14px 18px; border: 1px solid var(--ins-border); border-radius: 14px; background: var(--ins-surface); }

/* ---------- students ---------- */
.ins-options { display: grid; grid-template-columns: 1.3fr 1fr; gap: 20px; align-items: start; }
.ins-option { position: relative; padding: 28px; border: 1px solid var(--ins-border); border-radius: var(--ins-radius); background: var(--ins-surface); }
.ins-option-featured { border: 2px solid var(--ins-blue); box-shadow: var(--ins-shadow); }
.ins-badge { position: absolute; top: 20px; right: 20px; margin: 0; padding: 4px 12px; border-radius: 999px; background: var(--ins-orange); color: #2A1A00 !important; font-weight: 700; font-size: .8rem; }
.ins-price { font-size: 2.6rem; font-weight: 800; color: var(--ins-ink) !important; margin: 8px 0 12px; }
.ins-price span { font-size: 1rem; font-weight: 500; color: var(--ins-muted); }
.ins-checks { list-style: none; margin: 0 0 14px; padding: 0; display: grid; gap: 10px; }
.ins-checks li { padding-left: 26px; position: relative; color: var(--ins-ink-2); line-height: 1.5; }
.ins-checks li::before { content: "\2713"; position: absolute; left: 0; color: var(--ins-blue-deep); font-weight: 800; }
.ins-note { padding: 12px 14px; border-radius: 12px; background: var(--ins-tint); }
.ins-status { margin: 24px auto 0; max-width: 640px; padding: 20px 24px; border: 1px solid var(--ins-border); border-radius: var(--ins-radius); background: var(--ins-tint); text-align: center; }
.ins-status .ins-btn { margin: 6px; }

/* ---------- bookstores ---------- */
.ins-bookstores {
    display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: center; padding: 36px;
    border: 1px solid var(--ins-border); border-radius: 24px; background: linear-gradient(120deg, #F6FBFF, #E3F6FF);
}
.ins-terms { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.ins-terms li { padding: 14px 16px; border-radius: 14px; background: var(--ins-surface); border: 1px solid var(--ins-border); font-weight: 600; color: var(--ins-ink); }

/* ---------- author ---------- */
.ins-author { display: grid; grid-template-columns: 180px 1fr; gap: 40px; align-items: center; }
.ins-author img { width: 180px; height: 180px; border-radius: 50%; object-fit: cover; border: 6px solid var(--ins-surface); box-shadow: var(--ins-shadow); }
.ins-author blockquote { margin: 0 0 14px; font-size: 1.3rem; line-height: 1.55; color: var(--ins-ink); font-weight: 500; }
.ins-signature { margin: 0; }

/* ---------- more books ---------- */
.ins-books { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.ins-book { display: flex; gap: 14px; padding: 16px; border: 1px solid var(--ins-border); border-radius: 16px; background: var(--ins-surface); }
.ins-book img { width: 72px; height: auto; border-radius: 4px; box-shadow: 0 4px 10px rgba(2, 6, 23, .18); flex: none; align-self: flex-start; }
.ins-book h3 { font-size: 1rem; }
.ins-book p { margin: 0 0 8px; font-size: .92rem; }

/* ---------- FAQ ---------- */
.ins-faq { max-width: 860px; }
.ins-faq details { border: 1px solid var(--ins-border); border-radius: 14px; background: var(--ins-surface); margin-bottom: 10px; }
.ins-faq summary { padding: 16px 20px; font-weight: 600; cursor: pointer; color: var(--ins-ink); }
.ins-faq details p { margin: 0; padding: 0 20px 16px; }

/* ---------- closing ---------- */
.ins-closing { margin: 72px 0; padding: 56px 24px; text-align: center; border: 1px solid var(--ins-border); border-radius: 28px; background: radial-gradient(600px 240px at 50% 0%, #D9F3FF, var(--ins-tint)); }
.ins-closing h2 { margin-bottom: 24px; }

/* ---------- phones ---------- */
@media (max-width: 899.98px) {
    .ins-section { padding: 48px 0; }
    .ins-wrap { padding: 0 16px; }
    .ins-hero { padding: calc(96px + var(--topnav-inset-top, 0px)) 0 24px; }
    .ins-hero-grid, .ins-two, .ins-options, .ins-bookstores, .ins-author { grid-template-columns: 1fr; }
    .ins-hero-visual { justify-content: center; }
    .ins-hero-book { width: min(300px, 80%); }
    .ins-proof { grid-template-columns: 1fr 1fr; padding: 16px; }
    .ins-quiz { grid-template-columns: 1fr 1fr; }
    .ins-books { grid-template-columns: 1fr; }
    .ins-terms { grid-template-columns: 1fr; }
    .ins-bookstores { padding: 24px; }
    .ins-author { text-align: center; justify-items: center; gap: 20px; }
    .ins-author blockquote { font-size: 1.1rem; }
    .ins-actions .ins-btn { width: 100%; }
}

@media (max-width: 420px) {
    .ins-proof { grid-template-columns: 1fr; }
}

/* ---------- dark mode: tokens only, on the site's single dark-mode signal ---------- */
html.dark-mode .ins-shell,
body.dark-mode .ins-shell {
    --ins-blue-deep: #7FD3FF;
    --ins-step-build: #FFD080;
    --ins-step-check: #7FD3FF;
    --ins-tint: #121D28;
    --ins-ink: #EEF4F9;
    --ins-ink-2: #C3CED8;
    --ins-muted: #93A0AC;
    --ins-surface: #0B141D;
    --ins-border: #253545;
    --ins-shadow: 0 10px 30px rgba(0, 0, 0, .35);
}
html.dark-mode .ins-hero,
body.dark-mode .ins-hero { background: radial-gradient(1200px 500px at 85% 20%, #10293A 0%, rgba(16, 41, 58, 0) 70%); }
html.dark-mode .ins-bookstores,
body.dark-mode .ins-bookstores { background: linear-gradient(120deg, #121D28, #10293A); }
html.dark-mode .ins-closing,
body.dark-mode .ins-closing { background: radial-gradient(600px 240px at 50% 0%, #10293A, var(--ins-tint)); }
html.dark-mode .ins-shell code,
body.dark-mode .ins-shell code { color: #7FD3FF; }