/* ===========================
   style.css — Full Redesign
   =========================== */

/* Reset */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    font-family: 'Pretendard Variable', Pretendard, -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
    background: var(--bg-main);
    color: var(--text-body);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    word-break: keep-all;
    overflow-x: hidden;
    cursor: none;
}

::selection { background: var(--accent-bg); color: var(--accent); }
a { color: inherit; text-decoration: none; cursor: none; }
button { cursor: none; }

/* =====================
   Custom Cursor
   ===================== */
.cursor-dot {
    position: fixed;
    width: 6px;
    height: 6px;
    background: var(--accent);
    border-radius: 50%;
    pointer-events: none;
    z-index: 9999;
    transform: translate(-50%, -50%);
    transition: opacity 0.2s;
}

.cursor-ring {
    position: fixed;
    width: 36px;
    height: 36px;
    border: 1.5px solid var(--accent);
    border-radius: 50%;
    pointer-events: none;
    z-index: 9998;
    transform: translate(-50%, -50%);
    transition: width 0.25s ease, height 0.25s ease, background 0.25s ease, border-color 0.25s ease;
}

.cursor-ring.hovering {
    width: 56px;
    height: 56px;
    background: rgba(37, 99, 235, 0.08);
    border-color: transparent;
}

/* =====================
   Layout
   ===================== */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 32px;
}

section { padding: var(--section-padding); }

.section-label {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    text-align: center;
    margin-bottom: 12px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-title);
    letter-spacing: -0.04em;
    margin-bottom: 16px;
}

.section-desc {
    color: var(--text-muted);
    font-size: 1rem;
    margin-bottom: 64px;
    text-align: center;
}

/* =====================
   Header
   ===================== */
header {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    padding: 20px 0;
    transition: background 0.3s, backdrop-filter 0.3s, border-bottom 0.3s;
}

header.scrolled {
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-light);
}

.nav-inner {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.25rem;
    font-weight: 900;
    color: var(--text-title);
    letter-spacing: -0.02em;
}

nav { display: flex; gap: 32px; }

nav a {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-muted);
    transition: color var(--transition-fast);
}

nav a:hover { color: var(--text-title); }

/* =====================
   Hero
   ===================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
}

.hero-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 60px;
    flex-wrap: wrap-reverse;
    width: 100%;
}

.hero-text { flex: 1; min-width: 280px; }

.hero-tag {
    display: inline-block;
    padding: 6px 16px;
    background: var(--accent-bg);
    color: var(--accent);
    border-radius: 30px;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    margin-bottom: 24px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 900;
    color: var(--text-title);
    line-height: 1.15;
    letter-spacing: -0.04em;
    margin-bottom: 20px;
}

.hero-desc {
    font-size: 1.1rem;
    color: var(--text-body);
    line-height: 1.8;
    max-width: 560px;
    margin-bottom: 36px;
}

.btn-group { display: flex; gap: 12px; flex-wrap: wrap; }

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: 10px;
    font-weight: 700;
    font-size: 0.95rem;
    transition: all var(--transition-fast);
}

.btn-primary { background: var(--text-title); color: var(--bg-main); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.15); }

.btn-outline {
    background: transparent;
    border: 1.5px solid var(--border-light);
    color: var(--text-title);
}
.btn-outline:hover { background: var(--bg-sub); border-color: var(--border-hover); }

.hero-avatar {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: var(--bg-sub);
    border: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 0.9rem;
    flex-shrink: 0;
    overflow: hidden;
}

/* =====================
   Tech Stacks
   ===================== */
.stack-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.stack-card {
    background: var(--bg-sub);
    border: 1px solid var(--border-light);
    border-radius: 16px;
    padding: 28px;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.stack-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.06);
}

.stack-card-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-title);
    margin-bottom: 16px;
}

.stack-items { display: flex; flex-wrap: wrap; gap: 8px; }

.stack-item {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: 30px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-title);
    transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.stack-item:hover { transform: translateY(-2px); border-color: var(--text-muted); }
.stack-item i { font-size: 1.1rem; }

/* =====================
   Projects — Marquee Carousel
   ===================== */
#projects { overflow: hidden; padding-bottom: 80px; }
#projects .section-title, #projects .section-desc { padding: 0 32px; max-width: var(--container-max); margin-left: auto; margin-right: auto; }
#projects .section-title { text-align: center; }

.carousel-outer {
    position: relative;
    width: 100%;
    overflow: hidden;
}

/* Fade edges */
.carousel-outer::before,
.carousel-outer::after {
    content: '';
    position: absolute;
    top: 0; bottom: 0;
    width: 120px;
    z-index: 2;
    pointer-events: none;
}
.carousel-outer::before { left: 0; background: linear-gradient(to right, var(--bg-main), transparent); }
.carousel-outer::after { right: 0; background: linear-gradient(to left, var(--bg-main), transparent); }

.carousel-track {
    display: flex;
    gap: 28px;
    padding: 12px 24px 20px;
    width: max-content;
    animation: marquee-left 40s linear infinite;
    user-select: none;
}

.carousel-track.paused { animation-play-state: paused; }
.carousel-track.dragging { animation-play-state: paused; transition: none; }

@keyframes marquee-left {
    from { transform: translateX(0); }
    to   { transform: translateX(calc(-50% - 14px)); }
}

/* =====================
   Project Card
   ===================== */
.project-card {
    width: 380px;
    flex-shrink: 0;
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: 20px;
    overflow: hidden;
    transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.project-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.07);
    border-color: var(--border-hover);
}

.project-thumb {
    width: 100%;
    aspect-ratio: 16/10;
    background: var(--bg-sub);
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 500;
    overflow: hidden;
    position: relative;
}

.project-thumb img {
    width: 100%; height: 100%;
    object-fit: cover;
}

.project-body {
    padding: 24px;
}

.project-meta-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.project-period {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
}

.project-links { display: flex; gap: 12px; align-items: center; }

.project-link {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--accent);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.project-link:hover { text-decoration: underline; }

.project-name {
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--text-title);
    margin-bottom: 8px;
    line-height: 1.3;
    letter-spacing: -0.02em;
}

.project-desc {
    font-size: 0.9rem;
    color: var(--text-body);
    line-height: 1.6;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.project-tags { display: flex; flex-wrap: wrap; gap: 6px; }

.project-tag {
    padding: 4px 10px;
    background: var(--accent-bg);
    color: var(--accent);
    border-radius: 6px;
    font-size: 0.78rem;
    font-weight: 700;
}

/* =====================
   Activities — Same Marquee
   ===================== */
#activities { overflow: hidden; padding-bottom: 80px; }
#activities .section-title { text-align: center; }

/* =====================
   Background / Education
   ===================== */
.edu-section {
    max-width: 700px;
    margin: 0 auto;
}

.edu-category-label {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-muted);
    text-align: center;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 32px;
}

.edu-divider {
    border: none;
    border-top: 1px solid var(--border-light);
    margin: 48px 0;
}

.edu-row {
    display: flex;
    gap: 32px;
    margin-bottom: 40px;
    position: relative;
    padding-left: 16px;
}

.edu-row::before {
    content: '✳';
    position: absolute;
    left: -20px;
    top: 2px;
    font-size: 0.75rem;
    color: var(--accent);
}

.edu-period {
    width: 100px;
    flex-shrink: 0;
    font-size: 0.85rem;
    color: var(--text-muted);
    padding-top: 4px;
}

.edu-content {}

.edu-title {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--text-title);
    margin-bottom: 4px;
    letter-spacing: -0.02em;
}

.edu-sub {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 10px;
}

.edu-bullets {
    list-style: disc;
    padding-left: 20px;
    font-size: 0.9rem;
    color: var(--text-body);
    line-height: 1.7;
}

/* =====================
   GitHub Repos
   ===================== */
.github-filter {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 32px;
}

.filter-btn {
    padding: 8px 20px;
    border-radius: 30px;
    border: 1px solid var(--border-light);
    background: var(--bg-main);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-muted);
    transition: all var(--transition-fast);
}

.filter-btn.active, .filter-btn:hover {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.repo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 16px;
}

.repo-card {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: 14px;
    padding: 24px;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.repo-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.06);
}

.repo-name {
    font-size: 1.05rem;
    font-weight: 800;
    color: var(--accent);
    word-break: break-all;
}

.repo-desc {
    font-size: 0.875rem;
    color: var(--text-muted);
    flex-grow: 1;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.repo-meta {
    display: flex;
    gap: 16px;
    font-size: 0.8rem;
    color: var(--text-muted);
    align-items: center;
    margin-top: 4px;
}

.repo-lang-dot {
    width: 10px; height: 10px;
    border-radius: 50%;
    display: inline-block;
    margin-right: 4px;
}

.repo-meta-item {
    display: flex;
    align-items: center;
    gap: 4px;
}

.repo-loading { text-align: center; color: var(--text-muted); padding: 40px; }

/* =====================
   Ending / Footer
   ===================== */
.ending {
    text-align: center;
    padding: 160px 32px;
}

.ending h2 {
    font-size: 3rem;
    font-weight: 900;
    color: var(--text-title);
    line-height: 1.2;
    letter-spacing: -0.04em;
    margin-bottom: 20px;
}

.ending p {
    font-size: 1.1rem;
    color: var(--text-body);
    max-width: 560px;
    margin: 0 auto 40px;
    line-height: 1.8;
}

footer {
    padding: 32px;
    text-align: center;
    border-top: 1px solid var(--border-light);
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* =====================
   Responsive
   ===================== */
@media (max-width: 768px) {
    .hero-title { font-size: 2.5rem; }
    .section-title { font-size: 2rem; }
    .project-card { width: 300px; }
    .ending h2 { font-size: 2rem; }
}


/* =====================
   Modal
   ===================== */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--bg-main);
    border: 1px solid var(--border-light);
    border-radius: 20px;
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
    padding: 32px;
    position: relative;
    transform: translateY(20px);
    transition: transform 0.3s ease;
    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
    /* For custom scrollbar */
    scrollbar-width: thin;
    scrollbar-color: var(--accent) var(--bg-sub);
}

.modal-content::-webkit-scrollbar {
    width: 8px;
}
.modal-content::-webkit-scrollbar-track {
    background: var(--bg-sub);
    border-radius: 4px;
}
.modal-content::-webkit-scrollbar-thumb {
    background: var(--accent);
    border-radius: 4px;
}

.modal-overlay.active .modal-content {
    transform: translateY(0);
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 20px;
    background: var(--bg-sub);
    border: 1px solid var(--border-light);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--accent-bg);
    color: var(--accent);
}

.modal-title {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-title);
    margin-bottom: 12px;
    padding-right: 40px;
    letter-spacing: -0.02em;
}

.modal-body {
    font-size: 1rem;
    color: var(--text-body);
    line-height: 1.7;
}

.modal-body ul {
    margin-left: 20px;
    margin-bottom: 16px;
}

.modal-body p {
    margin-bottom: 16px;
}