/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Brand Colors from Images */
    --primary-green: #00FF41;
    --secondary-green: #39FF14;
    --primary-purple: #6B46C1;
    --secondary-purple: #8B5CF6;
    --primary-blue: #3B82F6;
    --secondary-blue: #60A5FA;
    --dark-bg: #000000;
    --dark-section: #0A0A0A;
    --text-white: #FFFFFF;
    --text-gray: #E5E7EB;
    --text-dark: #1F2937;
    --border-green: rgba(0, 255, 65, 0.3);
    --shadow-green: rgba(0, 255, 65, 0.1);
    --gradient-primary: linear-gradient(135deg, var(--primary-green), var(--secondary-green));
    --gradient-purple: linear-gradient(135deg, var(--primary-purple), var(--secondary-purple));
    --gradient-blue: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans KR', sans-serif;
    line-height: 1.6;
    color: var(--text-white);
    background-color: var(--dark-bg);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-green);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-image {
    height: 40px;
    width: auto;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: var(--text-white);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: var(--primary-green);
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background: var(--gradient-primary);
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background: var(--primary-green);
    margin: 3px 0;
    transition: 0.3s;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: var(--dark-bg);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.floating-character {
    position: absolute;
    animation: float 6s ease-in-out infinite;
    opacity: 0.8;
}

.char-1 {
    top: 10%;
    left: 10%;
    width: 80px;
    animation-delay: 0s;
}

.char-2 {
    top: 60%;
    left: 5%;
    width: 100px;
    animation-delay: 2s;
}

.char-3 {
    top: 20%;
    right: 15%;
    width: 90px;
    animation-delay: 1s;
}

.char-4 {
    bottom: 20%;
    right: 10%;
    width: 85px;
    animation-delay: 3s;
}

.char-5 {
    top: 50%;
    right: 50%;
    width: 70px;
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    25% { transform: translateY(-20px) rotate(2deg); }
    50% { transform: translateY(-10px) rotate(-1deg); }
    75% { transform: translateY(-15px) rotate(1deg); }
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 800px;
    padding: 2rem;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 900;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.title-main {
    display: block;
    color: var(--text-white);
    margin-bottom: 0.5rem;
}

.title-brand {
    display: block;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: clamp(2.5rem, 6vw, 4rem);
}

.hero-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.3rem);
    color: var(--text-gray);
    margin-bottom: 2.5rem;
    line-height: 1.6;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.cta-button {
    padding: 1rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.cta-button.primary {
    background: var(--gradient-primary);
    color: var(--dark-bg);
}

.cta-button.primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px var(--shadow-green);
}

.cta-button.secondary {
    background: transparent;
    color: var(--primary-green);
    border-color: var(--primary-green);
}

.cta-button.secondary:hover {
    background: var(--primary-green);
    color: var(--dark-bg);
    transform: translateY(-3px);
}

/* Section Styles */
.section-title {
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Calendar Section */
.calendar-section {
    padding: 5rem 0;
    background: var(--dark-section);
}

.calendar-container {
    max-width: 900px;
    margin: 0 auto;
    background: rgba(0, 255, 65, 0.05);
    border-radius: 20px;
    padding: 2rem;
    border: 1px solid var(--border-green);
}

.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.calendar-nav {
    background: var(--gradient-primary);
    border: none;
    color: var(--dark-bg);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    font-weight: bold;
    transition: all 0.3s ease;
}

.calendar-nav:hover {
    transform: scale(1.1);
}

.calendar-month {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-white);
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 1px;
    background: var(--border-green);
    border-radius: 10px;
    overflow: hidden;
}

.calendar-day-header {
    background: var(--dark-bg);
    padding: 1rem 0.5rem;
    text-align: center;
    font-weight: 600;
    color: var(--primary-green);
    font-size: 0.9rem;
}

.calendar-days {
    display: contents;
}

.calendar-day {
    background: var(--dark-bg);
    padding: 1.2rem 0.8rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    min-height: 100px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
}

.calendar-day:hover {
    background: rgba(0, 255, 65, 0.1);
}

.calendar-day.has-event {
    background: rgba(0, 255, 65, 0.05);
}

.calendar-day-number {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-white);
    margin-bottom: 0.5rem;
}

.calendar-day.has-event .calendar-day-number {
    color: var(--primary-green);
}

.calendar-event-container {
    display: flex;
    flex-direction: column;
    gap: 2px;
    width: 100%;
    align-items: center;
}

.calendar-event-label {
    font-size: 0.65rem;
    padding: 2px 6px;
    border-radius: 8px;
    font-weight: 600;
    text-align: center;
    width: fit-content;
    min-width: 45px;
    line-height: 1.2;
}

.event-handson {
    background: rgba(0, 255, 65, 0.9);
    color: var(--dark-bg);
}

.event-seminar {
    background: rgba(107, 70, 193, 0.9);
    color: var(--text-white);
}

.event-networking {
    background: rgba(59, 130, 246, 0.9);
    color: var(--text-white);
}

/* Events Section */
.events-section {
    padding: 5rem 0;
    background: var(--dark-bg);
}

.events-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.event-card {
    background: rgba(0, 255, 65, 0.05);
    border-radius: 20px;
    padding: 2rem;
    border: 1px solid var(--border-green);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.event-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px var(--shadow-green);
    border-color: var(--primary-green);
}

.event-category {
    display: inline-block;
    padding: 0.5rem 1rem;
    border-radius: 25px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 1rem;
}

.event-category.handson {
    background: var(--gradient-primary);
    color: var(--dark-bg);
}

.event-category.seminar {
    background: var(--gradient-purple);
    color: var(--text-white);
}

.event-category.networking {
    background: var(--gradient-blue);
    color: var(--text-white);
}

.event-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-white);
    line-height: 1.3;
}

.event-meta {
    margin-bottom: 1rem;
}

.event-date, .event-location {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-gray);
}

.event-description {
    color: var(--text-gray);
    line-height: 1.6;
    margin-bottom: 2rem;
}

.event-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.event-price {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary-green);
}

.event-button {
    padding: 0.75rem 1.5rem;
    background: var(--gradient-primary);
    color: var(--dark-bg);
    text-decoration: none;
    border-radius: 25px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.event-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--shadow-green);
}

/* About Section */
.about-section {
    padding: 5rem 0;
    background: var(--dark-section);
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-description {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    color: var(--text-gray);
}

.about-description strong {
    color: var(--primary-green);
}

.target-audience h3 {
    font-size: 1.4rem;
    margin-bottom: 1.5rem;
    color: var(--text-white);
}

.target-audience ul {
    list-style: none;
}

.target-audience li {
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-green);
    color: var(--text-gray);
    line-height: 1.6;
}

.target-audience li:last-child {
    border-bottom: none;
}

.target-audience strong {
    color: var(--primary-green);
}

.about-mascot {
    width: 100%;
    max-width: 300px;
    height: auto;
    margin: 0 auto;
    display: block;
    animation: float 4s ease-in-out infinite;
}

/* Footer */
.footer {
    background: var(--dark-bg);
    border-top: 1px solid var(--border-green);
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-logo-image {
    height: 60px;
    width: auto;
}

.footer-info h3 {
    color: var(--primary-green);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.footer-info p {
    color: var(--text-gray);
    margin-bottom: 1rem;
}

.social-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.social-link {
    color: var(--text-gray);
    text-decoration: none;
    transition: color 0.3s ease;
}

.social-link:hover {
    color: var(--primary-green);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-green);
    color: var(--text-gray);
    font-size: 0.9rem;
}

/* Mobile Responsive */
@media screen and (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: rgba(0, 0, 0, 0.95);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        padding: 2rem 0;
        border-top: 1px solid var(--border-green);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .nav-toggle.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .cta-button {
        width: 100%;
        max-width: 300px;
    }

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

    .about-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .floating-character {
        display: none;
    }
}

@media screen and (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .event-card {
        padding: 1.5rem;
    }

    .calendar-container {
        padding: 1rem;
    }

    .calendar-day-header {
        padding: 0.5rem;
        font-size: 0.8rem;
    }

    .calendar-day {
        padding: 0.8rem 0.4rem;
        min-height: 80px;
    }

    .calendar-day-number {
        font-size: 1rem;
    }

    .calendar-event-label {
        font-size: 0.6rem;
        padding: 1px 4px;
        min-width: 35px;
    }
}
/* ===== 정보글(Posts) 추가 스타일 ===== */

/* Posts 목록 */
.posts-section {
    padding: 5rem 0;
    background: var(--dark-bg);
}

.posts-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 2rem;
}

.post-item {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    background: rgba(0, 255, 65, 0.03);
    border: 1px solid var(--border-green);
    border-radius: 16px;
    padding: 1.5rem 2rem;
    text-decoration: none;
    transition: all 0.3s ease;
}

.post-item:hover {
    transform: translateX(6px);
    border-color: var(--primary-green);
    background: rgba(0, 255, 65, 0.07);
}

.post-emoji {
    font-size: 2rem;
    line-height: 1;
    flex-shrink: 0;
}

.post-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.4rem;
    flex-wrap: wrap;
}

.post-tag {
    font-size: 0.75rem;
    padding: 0.2rem 0.7rem;
    border-radius: 20px;
    font-weight: 600;
}

.post-tag.azure { background: rgba(59,130,246,0.15); color: #60a5fa; border: 1px solid rgba(59,130,246,0.3); }
.post-tag.github { background: rgba(139,92,246,0.15); color: #a78bfa; border: 1px solid rgba(139,92,246,0.3); }
.post-tag.career { background: rgba(245,158,11,0.15); color: #fbbf24; border: 1px solid rgba(245,158,11,0.3); }
.post-tag.opensource { background: rgba(0,255,65,0.1); color: var(--primary-green); border: 1px solid var(--border-green); }

.post-date {
    font-size: 0.8rem;
    color: #6b7280;
}

.post-title {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-white);
    margin-bottom: 0.3rem;
    line-height: 1.4;
}

.post-excerpt {
    font-size: 0.85rem;
    color: #9ca3af;
    line-height: 1.5;
}

/* Filter buttons */
.filter-bar {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-bottom: 2.5rem;
}

.filter-btn {
    padding: 0.5rem 1.25rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    background: transparent;
    border: 1px solid var(--border-green);
    color: #9ca3af;
    transition: all 0.3s ease;
}

.filter-btn:hover,
.filter-btn.active {
    border-color: var(--primary-green);
    color: var(--primary-green);
    background: rgba(0, 255, 65, 0.08);
}

/* 행사/정보글 상세 공통 */
.detail-hero {
    padding: 8rem 0 4rem;
    background: linear-gradient(135deg, rgba(0, 255, 65, 0.08), rgba(0, 0, 0, 0.95));
    min-height: 55vh;
    display: flex;
    align-items: center;
}

.badge {
    display: inline-block;
    padding: 0.4rem 1rem;
    border-radius: 25px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-right: 0.5rem;
    margin-bottom: 1.5rem;
}

.badge.offline { background: rgba(0,255,65,0.15); color: var(--primary-green); border: 1px solid var(--border-green); }
.badge.online { background: rgba(59,130,246,0.15); color: #60a5fa; border: 1px solid rgba(59,130,246,0.3); }
.badge.recruiting { background: rgba(245,158,11,0.15); color: #fbbf24; border: 1px solid rgba(245,158,11,0.3); }

/* 정보 그리드 */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1rem;
    margin-bottom: 2.5rem;
}

.info-card {
    background: rgba(0,255,65,0.05);
    border: 1px solid var(--border-green);
    border-radius: 16px;
    padding: 1.25rem;
    text-align: center;
}

.info-card .icon { font-size: 1.75rem; margin-bottom: 0.4rem; }
.info-card .label { font-size: 0.75rem; color: #6b7280; margin-bottom: 0.3rem; text-transform: uppercase; }
.info-card .value { font-size: 0.95rem; font-weight: 600; color: var(--text-white); }
.info-card .value.accent { color: var(--primary-green); }

/* CTA 배너 */
.cta-banner {
    background: linear-gradient(135deg, rgba(0,255,65,0.08), rgba(59,130,246,0.08));
    border: 1px solid var(--border-green);
    border-radius: 20px;
    padding: 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.cta-banner .cta-text .deadline {
    font-size: 0.85rem;
    color: #9ca3af;
    margin-top: 0.3rem;
}

/* Prose 본문 */
.prose {
    color: #d1d5db;
    line-height: 1.85;
}

.prose h2 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--primary-green);
    margin: 2.5rem 0 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-green);
}

.prose h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-white);
    margin: 1.75rem 0 0.6rem;
}

.prose p { margin: 0.85rem 0; }

.prose a { color: var(--primary-green); text-decoration: underline; text-underline-offset: 3px; }
.prose a:hover { color: var(--secondary-green); }

.prose ul { list-style: disc; padding-left: 1.5rem; margin: 0.75rem 0; }
.prose li { margin: 0.4rem 0; }

.prose blockquote {
    border-left: 3px solid var(--primary-green);
    padding: 0.75rem 1.25rem;
    color: #9ca3af;
    font-style: italic;
    margin: 1.5rem 0;
    background: rgba(0,255,65,0.04);
    border-radius: 0 8px 8px 0;
}

.prose code {
    background: rgba(0,255,65,0.08);
    border: 1px solid var(--border-green);
    border-radius: 4px;
    padding: 0.15em 0.4em;
    font-size: 0.875em;
    font-family: 'Fira Code', 'Cascadia Code', monospace;
    color: var(--primary-green);
}

.prose strong { color: var(--text-white); }

/* 브레드크럼 */
.breadcrumb {
    font-size: 0.85rem;
    color: #6b7280;
    margin-bottom: 1.5rem;
}

.breadcrumb a { color: #9ca3af; text-decoration: none; }
.breadcrumb a:hover { color: var(--primary-green); }
.breadcrumb .sep { margin: 0 0.5rem; }

/* 커뮤니티 CTA 섹션 */
.community-cta {
    background: rgba(0,255,65,0.05);
    border: 1px solid var(--border-green);
    border-radius: 20px;
    padding: 3rem 2rem;
    text-align: center;
    margin-top: 2rem;
}

.community-cta h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.community-cta p { color: #9ca3af; margin-bottom: 1.5rem; font-size: 0.95rem; }

.btn-group { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

.btn-primary {
    padding: 0.85rem 2rem;
    background: var(--gradient-primary);
    color: var(--dark-bg);
    text-decoration: none;
    border-radius: 50px;
    font-weight: 700;
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 8px 25px var(--shadow-green); }

.btn-secondary {
    padding: 0.85rem 2rem;
    background: transparent;
    color: var(--primary-green);
    border: 2px solid var(--primary-green);
    text-decoration: none;
    border-radius: 50px;
    font-weight: 700;
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

.btn-secondary:hover { background: var(--primary-green); color: var(--dark-bg); transform: translateY(-3px); }

/* 페이지 헤더 (목록 페이지) */
.page-header {
    padding: 7rem 0 3rem;
    background: var(--dark-section);
    border-bottom: 1px solid var(--border-green);
}

.page-header h1 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.75rem;
}

.page-header p { color: #9ca3af; font-size: 1.05rem; }

/* 행사 상세 content 영역 */
.event-detail-section {
    padding: 4rem 0;
    background: var(--dark-bg);
}