@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=IBM+Plex+Mono:wght@500;600&display=swap');

/* W3COACH — 워크북/문서형 미니멀.
   orisea.cc(다크 사이버)와 의도적으로 다른 팔레트: 같은 서버에 올라가지만
   별개 브랜드로 읽혀야 한다. */
:root {
    --ink: #16181d;
    --ink-soft: #4d5461;
    --ink-faint: #8a909c;
    --paper: #fcfcfd;
    --paper-alt: #f4f5f8;
    --line: #e2e5ec;
    --line-strong: #c9cdd8;
    --brand: #3341c4;
    --brand-dark: #242fa0;
    --brand-tint: #eef0fc;
    --radius: 6px;
    --maxw: 1060px;
    --mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    background: var(--paper);
    color: var(--ink);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Apple SD Gothic Neo', sans-serif;
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3 {
    line-height: 1.3;
    letter-spacing: -0.021em;
    font-weight: 700;
}

a {
    color: var(--brand);
}

strong {
    font-weight: 600;
    color: var(--ink);
}

/* 섹션 머리의 [ PART 01 ] 류 모노스페이스 라벨 */
.label {
    font-family: var(--mono);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--brand);
    text-transform: uppercase;
    margin-bottom: 1rem;
}

/* --- Header --- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
    padding: 1rem 6%;
    background: rgba(252, 252, 253, 0.88);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--line);
}

.logo {
    font-family: var(--mono);
    font-weight: 600;
    font-size: 1.05rem;
    letter-spacing: -0.01em;
    text-decoration: none;
    color: var(--ink);
}

.logo span {
    color: var(--brand);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1.6rem;
}

.nav-links a {
    color: var(--ink-soft);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.18s;
}

.nav-links a:hover {
    color: var(--ink);
}

.nav-links .nav-cta {
    padding: 0.45rem 1.05rem;
    border-radius: var(--radius);
    background: var(--ink);
    color: var(--paper);
    font-weight: 600;
}

.nav-links .nav-cta:hover {
    background: var(--brand);
    color: #fff;
}

/* --- Hero --- */
.hero {
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 6.5rem 6% 5rem;
}

.hero h1 {
    font-size: clamp(2.1rem, 5.4vw, 3.5rem);
    font-weight: 800;
    margin-bottom: 1.6rem;
}

.lede {
    max-width: 620px;
    color: var(--ink-soft);
    font-size: 1.07rem;
}

.cta-group {
    display: flex;
    flex-wrap: wrap;
    gap: 0.7rem;
    margin-top: 2.25rem;
}

.btn {
    display: inline-block;
    padding: 0.8rem 1.7rem;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: 0.18s;
    border: 1px solid transparent;
}

.btn-primary {
    background: var(--ink);
    color: var(--paper);
}

.btn-primary:hover {
    background: var(--brand);
    color: #fff;
}

.btn-ghost {
    border-color: var(--line-strong);
    color: var(--ink);
    background: transparent;
}

.btn-ghost:hover {
    border-color: var(--ink);
}

.btn-lg {
    padding: 1rem 2.2rem;
    font-size: 1rem;
    font-family: var(--mono);
    font-weight: 600;
}

.stat-row {
    display: flex;
    flex-wrap: wrap;
    gap: 3.5rem;
    margin-top: 4rem;
    padding-top: 2.25rem;
    border-top: 1px solid var(--line);
    list-style: none;
}

.stat-row li {
    display: flex;
    flex-direction: column;
}

.stat-row strong {
    font-family: var(--mono);
    font-size: 1.3rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.stat-row span {
    color: var(--ink-faint);
    font-size: 0.85rem;
}

/* --- Sections --- */
.section {
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 5.5rem 6%;
}

.section-alt {
    max-width: none;
    background: var(--paper-alt);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}

.section-alt>* {
    max-width: var(--maxw);
    margin-left: auto;
    margin-right: auto;
}

.section-title {
    font-size: clamp(1.55rem, 3.4vw, 2.1rem);
    margin-bottom: 1rem;
}

.section-lede {
    color: var(--ink-soft);
    max-width: 640px;
    margin-bottom: 3rem;
}

/* --- Generic cards (교육 방식 / 교육 대상) --- */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.25rem;
}

.card-grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.card {
    background: var(--paper);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 1.75rem;
}

.card-tag {
    font-family: var(--mono);
    color: var(--brand);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    margin-bottom: 0.7rem;
}

.card h3 {
    font-size: 1.15rem;
    margin-bottom: 0.65rem;
}

.card-desc {
    color: var(--ink-soft);
    font-size: 0.93rem;
}

/* --- Programs --- */
.program-list {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.program {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 2.5rem;
    background: var(--paper);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 2rem;
}

.program-featured {
    border-color: var(--brand);
    box-shadow: 0 6px 24px rgba(51, 65, 196, 0.08);
}

.program-head h3 {
    font-size: 1.3rem;
    margin-bottom: 0.4rem;
}

.program-meta {
    font-family: var(--mono);
    font-size: 0.8rem;
    color: var(--ink-faint);
}

.program-body>p {
    color: var(--ink-soft);
    font-size: 0.95rem;
    margin-bottom: 1.2rem;
}

.tick-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 0.5rem 1.5rem;
}

.tick-list li {
    position: relative;
    padding-left: 1.3rem;
    font-size: 0.91rem;
    color: var(--ink-soft);
}

.tick-list li::before {
    content: "—";
    position: absolute;
    left: 0;
    color: var(--brand);
}

/* --- Syllabus --- */
.syllabus {
    list-style: none;
    border-top: 1px solid var(--line-strong);
}

.syllabus li {
    display: grid;
    grid-template-columns: 160px 1fr;
    gap: 2rem;
    padding: 1.6rem 0;
    border-bottom: 1px solid var(--line);
}

.syllabus-part {
    font-family: var(--mono);
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    color: var(--brand);
    padding-top: 0.2rem;
}

.syllabus h3 {
    font-size: 1.08rem;
    margin-bottom: 0.3rem;
}

.syllabus li>p:last-child {
    color: var(--ink-soft);
    font-size: 0.93rem;
    grid-column: 2;
}

/* --- Company / prose --- */
.prose {
    max-width: 660px;
    display: flex;
    flex-direction: column;
    gap: 1.1rem;
    color: var(--ink-soft);
}

.contact-card {
    margin-top: 1rem;
    padding: 1.4rem 1.6rem;
    background: var(--paper);
    border: 1px solid var(--line);
    border-radius: var(--radius);
}

.contact-card dt {
    font-family: var(--mono);
    font-size: 0.74rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--ink-faint);
    margin-bottom: 0.3rem;
}

.contact-card dd {
    font-family: var(--mono);
    font-size: 1rem;
}

.contact-card dd a {
    text-decoration: none;
}

.contact-card dd a:hover {
    text-decoration: underline;
}

/* --- FAQ --- */
.faq-list {
    max-width: 740px;
    border-top: 1px solid var(--line-strong);
}

.faq-list details {
    border-bottom: 1px solid var(--line);
}

.faq-list summary {
    padding: 1.1rem 2rem 1.1rem 0;
    font-weight: 600;
    cursor: pointer;
    list-style: none;
    position: relative;
}

.faq-list summary::-webkit-details-marker {
    display: none;
}

.faq-list summary::after {
    content: "+";
    position: absolute;
    right: 0.25rem;
    top: 0.95rem;
    font-family: var(--mono);
    color: var(--brand);
    font-size: 1.2rem;
    font-weight: 500;
    line-height: 1;
}

.faq-list details[open] summary::after {
    content: "\2212";
}

.faq-list details p {
    padding: 0 2rem 1.25rem 0;
    color: var(--ink-soft);
    font-size: 0.94rem;
}

/* --- Contact --- */
.contact .section-lede {
    margin-bottom: 2.25rem;
}

.contact-note {
    margin-top: 1.25rem;
    color: var(--ink-faint);
    font-size: 0.85rem;
}

/* --- Footer --- */
.site-footer {
    padding: 3rem 6%;
    border-top: 1px solid var(--line);
    background: var(--paper-alt);
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1.5rem;
    color: var(--ink-faint);
    font-size: 0.85rem;
}

.footer-brand {
    font-family: var(--mono);
    font-weight: 600;
    color: var(--ink);
    font-size: 0.95rem;
}

.footer-meta {
    text-align: right;
}

.footer-meta a {
    color: var(--ink-soft);
    text-decoration: none;
}

.footer-meta a:hover {
    color: var(--brand);
}

/* --- Mobile --- */
@media (max-width: 860px) {
    .program {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }

    .syllabus li {
        grid-template-columns: 1fr;
        gap: 0.4rem;
    }

    .syllabus li>p:last-child {
        grid-column: 1;
    }
}

@media (max-width: 768px) {
    .site-header {
        flex-wrap: wrap;
        gap: 0.75rem;
    }

    .nav-links a:not(.nav-cta) {
        display: none;
    }

    .stat-row {
        gap: 1.75rem;
        margin-top: 3rem;
    }

    .footer-meta {
        text-align: left;
    }
}