/* ========================================
   RESET & BASE
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: #ffffff;
    color: #000000;
    line-height: 1.6;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    display: flex;
    min-height: 100vh;
}

::selection {
    background-color: #000000;
    color: #ffffff;
}

/* ========================================
   TYPOGRAPHY
   ======================================== */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Noto Sans KR', sans-serif;
    line-height: 1.2;
    font-weight: 600;
    letter-spacing: -0.02em;
}

a {
    color: #000000;
    text-decoration: none;
    transition: all 0.2s ease;
}

/* ========================================
   SIDEBAR
   ======================================== */
.sidebar {
    width: 400px;
    min-height: 100vh;
    background-color: #fafafa;
    border-right: 1px solid #e0e0e0;
    padding: 3rem 2.5rem;
    overflow-y: auto;
    position: sticky;
    top: 0;
    height: 100vh;
}

.sidebar-content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Site Header */
.site-header {
    padding-bottom: 1.5rem;
    border-bottom: 1px solid #d0d0d0;
}

.site-title {
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 0.5rem;
    letter-spacing: -0.03em;
}

.site-subtitle {
    font-size: 0.75rem;
    color: #666666;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Reference Box */
.reference-box {
    background-color: #ffffff;
    padding: 1.25rem;
    border-left: 2px solid #000000;
    font-size: 0.75rem;
    line-height: 1.6;
    color: #555555;
}

/* Info Sections */
.info-section {
    padding-bottom: 1.5rem;
    border-bottom: 1px solid #e8e8e8;
}

.info-title {
    font-size: 0.625rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: #999999;
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.info-list {
    list-style: none;
    padding-left: 0;
}

.info-list li {
    font-size: 0.875rem;
    line-height: 1.6;
    margin-bottom: 0.5rem;
    padding-left: 0.75rem;
    position: relative;
    word-break: keep-all;
    overflow-wrap: break-word;
}

.info-list li:before {
    content: "·";
    position: absolute;
    left: 0;
    color: #999999;
}

.inline-link {
    color: #000000;
    border-bottom: 1px solid #d0d0d0;
    transition: all 0.2s ease;
}

.inline-link:hover {
    border-bottom-color: #000000;
    font-weight: 500;
}

.location-name {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.location-name .inline-link {
    font-weight: 600;
}

.location-address {
    font-size: 0.875rem;
    line-height: 1.5;
    margin-bottom: 0;
    color: #555555;
}

.map-link {
    font-size: 0.75rem;
    margin-left: 0.5rem;
}

.partner-name {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.partner-name:last-child {
    margin-bottom: 0;
}

.partner-name .inline-link {
    font-weight: 600;
}

.location-link {
    font-size: 0.75rem;
    border-bottom: 1px solid #000000;
    padding-bottom: 0.125rem;
}

.location-link:hover {
    background-color: #000000;
    color: #ffffff;
}

/* CTA Box */
.cta-box {
    margin-top: 1rem;
}

/* 신청 가능 시: Apply Now 버튼 보이기 */
.cta-box.open .cta-open {
    display: block;
}

.cta-box.open .cta-closed {
    display: none;
}

/* 신청 마감 시: 마감 메시지 보이기 */
.cta-box.closed .cta-open {
    display: none;
}

.cta-box.closed .cta-closed {
    display: block;
}

.cta-button {
    display: block;
    text-align: center;
    border: 1px solid #000000;
    padding: 1rem 2rem;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    font-weight: 500;
    transition: all 0.25s ease;
}

.cta-button:hover {
    background-color: #000000;
    color: #ffffff;
}

.cta-closed {
    text-align: center;
    border: 1px solid #d0d0d0;
    padding: 1rem 2rem;
}

.closed-text {
    font-size: 0.875rem;
    color: #999999;
    letter-spacing: 0.05em;
}

/* Sidebar Footer */
.sidebar-footer {
    margin-top: auto;
    padding-top: 2rem;
}

.footer-credit {
    font-size: 0.6875rem;
    line-height: 1.6;
    color: #888888;
    margin-bottom: 1.5rem;
    word-break: keep-all;
    overflow-wrap: break-word;
}

.footer-credit a {
    color: #000000;
    border-bottom: 1px solid #d0d0d0;
}

.footer-credit a:hover {
    border-bottom-color: #000000;
}

.footer-contact {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.contact-link {
    font-size: 0.6875rem;
    color: #666666;
    border-bottom: 1px solid transparent;
    transition: all 0.2s ease;
}

.contact-link:hover {
    color: #000000;
    border-bottom-color: #000000;
}

/* ========================================
   MAIN CONTENT
   ======================================== */
.main-content {
    flex: 1;
    padding: 3rem;
    max-width: 1200px;
    display: flex;
    flex-direction: column;
    gap: 4rem;
}

/* Hero Section */
.hero-section {
    padding: 2rem 0;
}

.hero-question {
    font-size: clamp(1.5rem, 3vw, 2.25rem);
    font-weight: 400;
    font-style: italic;
    line-height: 1.4;
    color: #333333;
    margin-bottom: 1.25rem;
}

.hero-question:last-child {
    margin-bottom: 0;
}

/* Intro Section */
.intro-section {
    padding: 0 0 2rem 0;
    border-bottom: 1px solid #e0e0e0;
}

.intro-text {
    font-size: 1.125rem;
    line-height: 1.7;
    max-width: 1000px;
    word-break: keep-all;
    overflow-wrap: break-word;
}

.intro-question {
    font-style: italic;
}

/* Schedule Section */
.schedule-section {
    padding: 2rem 0;
}

.section-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.3em;
    color: #999999;
    margin-bottom: 2rem;
    font-weight: 600;
}

.schedule-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.schedule-card {
    border: 1px solid #e0e0e0;
    padding: 1.5rem;
    transition: all 0.25s ease;
    background-color: #ffffff;
}

.schedule-card:hover {
    border-color: #000000;
    box-shadow: 2px 2px 0 #000000;
    transform: translate(-2px, -2px);
}

.schedule-meta {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 1rem;
    font-size: 0.625rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: #999999;
}

.week-label {
    font-weight: 600;
    color: #000000;
}

.schedule-title {
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 1rem;
}

.schedule-topics {
    list-style: none;
    padding-left: 0;
}

.schedule-topics li {
    font-size: 0.8125rem;
    line-height: 1.6;
    margin-bottom: 0.25rem;
    padding-left: 1rem;
    position: relative;
    color: #555555;
}

.schedule-topics li:before {
    content: "—";
    position: absolute;
    left: 0;
    color: #d0d0d0;
}

.schedule-description {
    margin-top: 1rem;
    font-size: 0.9375rem;
    line-height: 1.6;
    opacity: 0.8;
    word-break: keep-all;
    overflow-wrap: break-word;
}

/* Philosophy Section */
.philosophy-section {
    padding: 4rem 0 2rem;
    border-top: 1px solid #e0e0e0;
    text-align: center;
}

.philosophy-text {
    font-size: 1.25rem;
    font-weight: 300;
    line-height: 1.8;
    color: #333333;
    margin-bottom: 0.5rem;
}

.philosophy-text:last-child {
    margin-bottom: 0;
}

/* ========================================
   CURRICULUM PAGE
   ======================================== */

/* Back Link */
.back-section {
    padding-bottom: 1.5rem;
    border-bottom: 1px solid #e8e8e8;
}

.back-link {
    font-size: 0.75rem;
    color: #666666;
    border-bottom: 1px solid transparent;
    transition: all 0.2s ease;
}

.back-link:hover {
    color: #000000;
    border-bottom-color: #000000;
}

/* Curriculum Navigation */
.curriculum-nav {
    padding-bottom: 1.5rem;
    border-bottom: 1px solid #e8e8e8;
}

.nav-title {
    font-size: 0.625rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: #999999;
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.nav-list {
    list-style: none;
    padding-left: 0;
}

.nav-list li {
    margin-bottom: 0.5rem;
}

.nav-link {
    font-size: 0.875rem;
    color: #000000;
    padding: 0.25rem 0;
    display: block;
    transition: all 0.2s ease;
}

.nav-link:hover {
    padding-left: 0.5rem;
    font-weight: 500;
}

/* Curriculum Main Content */
.curriculum-main {
    gap: 3rem;
}

.curriculum-intro {
    padding: 2rem 0;
    border-bottom: 1px solid #e0e0e0;
}

.intro-message {
    font-size: 1rem;
    line-height: 1.7;
    color: #555555;
    word-break: keep-all;
    overflow-wrap: break-word;
}

.intro-quote {
    font-style: italic;
    color: #333333;
}

/* Week Sections */
.week-section {
    padding: 2.5rem 0;
    border-bottom: 1px solid #e0e0e0;
}

.week-section:last-of-type {
    border-bottom: none;
}

.week-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 0.75rem;
}

.week-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: #000000;
    font-weight: 600;
}

.week-date {
    font-size: 0.625rem;
    color: #999999;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.week-theme {
    font-size: 1.5rem;
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 2rem;
    color: #000000;
}

/* Material List */
.material-list {
    list-style: none;
    padding-left: 0;
}

.material-item {
    display: flex;
    align-items: baseline;
    padding: 1rem 0;
    border-bottom: 1px solid #f0f0f0;
    transition: all 0.2s ease;
}

.material-item:hover {
    background-color: #fafafa;
    padding-left: 0.5rem;
}

.material-item:last-child {
    border-bottom: none;
}

.material-number {
    font-size: 0.75rem;
    color: #999999;
    min-width: 60px;
    margin-right: 1rem;
    font-weight: 500;
    font-family: monospace;
}

.material-link {
    font-size: 1rem;
    color: #000000;
    border-bottom: 1px solid #e0e0e0;
    transition: all 0.2s ease;
}

.material-link:hover {
    border-bottom-color: #000000;
    font-weight: 500;
}

/* ========================================
   RESPONSIVE
   ======================================== */
@media (max-width: 1024px) {
    body {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        min-height: auto;
        height: auto;
        position: relative;
        border-right: none;
        border-bottom: 1px solid #e0e0e0;
        padding: 2rem 1.5rem;
    }

    .sidebar-content {
        gap: 1.5rem;
    }

    .main-content {
        padding: 2rem 1.5rem;
        gap: 3rem;
    }

    .schedule-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .site-title {
        font-size: 1.25rem;
    }

    .hero-question {
        font-size: 1.25rem;
    }

    .intro-text {
        font-size: 1rem;
    }

    .schedule-card {
        padding: 1.25rem;
    }

    .philosophy-text {
        font-size: 1rem;
    }
}