@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@100;300;400;500;600;700&family=Sanchez&family=Varela+Round&display=swap');

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

html {
  scroll-behavior: smooth;
}

html, body {
  width: 100%;
  font-size: calc(0.75rem + 1.5vw);
  overflow-x: hidden;
}

body {
  background: #ffffff;
  color: #000000;
}

/* ========== SCROLLBAR ========== */
::-webkit-scrollbar { width: 10px; background: #fff; }
::-webkit-scrollbar-thumb { background: #888; border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: #aaa; }

/* ========== PROGRESS BAR ========== */
#progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  z-index: 9999;
  appearance: none;
  -webkit-appearance: none;
  background: transparent;
  border: none;
}
#progress-bar::-webkit-progress-bar { background: transparent; }
#progress-bar::-webkit-progress-value {
  background: linear-gradient(to right, #7f7fd5, #86a8e7, #91eae4);
}
#progress-bar::-moz-progress-bar {
  background: linear-gradient(to right, #7f7fd5, #86a8e7, #91eae4);
}

/* ========== LOADING PAGE ========== */
.loading-page {
  position: fixed;
  inset: 0;
  background: white;
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 24px;
  transition: opacity 0.7s ease, visibility 0.7s ease;
}

.loading-page.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loading-logo {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  width: 64px;
  height: 64px;
}

.loading-logo div {
  background: black;
  border-radius: 4px;
  transform: scale(0);
  animation: loadScale 0.35s ease forwards;
}

.loading-logo div:nth-child(1) { animation-delay: 0.0s; border-radius: 50% 4px 4px 4px; }
.loading-logo div:nth-child(2) { animation-delay: 0.1s; border-radius: 4px 50% 4px 4px; }
.loading-logo div:nth-child(3) { animation-delay: 0.2s; border-radius: 4px 4px 4px 50%; }
.loading-logo div:nth-child(4) { animation-delay: 0.3s; border-radius: 4px 4px 50% 4px; }

@keyframes loadScale { to { transform: scale(1); } }

.loading-name {
  font-family: 'Poppins', sans-serif;
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: 6px;
  opacity: 0;
  animation: fadeInUp 0.5s ease 0.45s forwards;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ========== HEADER ========== */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 80px;
  display: grid;
  grid-template-columns: repeat(13, 1fr);
  align-items: center;
  z-index: 100;
  background: transparent;
  transition: background 0.3s ease, backdrop-filter 0.3s ease;
}

header.scrolled {
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 24px rgba(0, 0, 0, 0.06);
}

.logo {
  grid-column: 2;
  display: flex;
  align-items: center;
}

.logo a {
  font-family: 'Varela Round', sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: black;
  text-decoration: none;
  transform: translateY(2px);
  display: block;
}

.nav-bar {
  grid-column: 7;
  display: flex;
  justify-content: center;
  align-items: flex-end;
  width: 100%;
}

nav {
  background: black;
  border-radius: 61px;
  height: 2rem;
  max-width: 40vw;
  width: 40vw;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

nav ul {
  display: flex;
  justify-content: space-between;
  list-style: none;
  align-items: center;
  width: 100%;
  padding: 0 24px;
  height: 100%;
}

nav ul li {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  border-radius: 50px;
  padding: 0 10px;
  cursor: pointer;
  transition: background 0.3s ease;
}

nav ul li a {
  text-decoration: none;
  color: white;
  font-family: 'Poppins', sans-serif;
  font-size: 0.52rem;
  font-weight: 500;
  white-space: nowrap;
  transition: color 0.3s ease;
  position: relative;
  z-index: 1;
}

nav ul li.active::before,
nav ul li:hover::before {
  content: '';
  background: white;
  border-radius: 50px;
  position: absolute;
  inset: 3px -4px;
  transition: all 0.4s ease;
}

nav ul li.active a,
nav ul li:hover a {
  color: black;
}

/* Hamburger */
.hamburger-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
  padding: 5px;
  position: absolute;
  right: 40px;
}

.hamburger-btn span {
  display: block;
  width: 26px;
  height: 2px;
  background: black;
  border-radius: 2px;
  transition: all 0.3s ease;
}

/* Mobile Menu */
.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.96);
  z-index: 200;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 40px;
  backdrop-filter: blur(12px);
  transform: translateY(-100%);
  transition: transform 0.5s cubic-bezier(0.76, 0, 0.24, 1);
}

.mobile-menu.open {
  transform: translateY(0);
}

.mobile-menu a {
  color: white;
  text-decoration: none;
  font-family: 'Poppins', sans-serif;
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: 2px;
  transition: opacity 0.2s ease;
}

.mobile-menu a:hover { opacity: 0.5; }

.mobile-close {
  position: absolute;
  top: 30px;
  right: 40px;
  background: none;
  border: none;
  color: white;
  font-size: 1.5rem;
  cursor: pointer;
  font-family: 'Poppins', sans-serif;
}

/* ========== LANDING PAGE ========== */
.landing-page {
  position: relative;
  height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding-top: 80px;
  width: 100%;
}

.subtitle {
  font-family: 'Sanchez', serif;
  font-size: 0.9rem;
  font-weight: 400;
  color: #333;
  letter-spacing: 3px;
  text-transform: uppercase;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 0.8s ease 1.0s forwards;
}

.main-photo {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 30px;
  margin-top: 30px;
}

.first-title,
.second-title {
  padding-top: 24px;
  opacity: 0;
  animation: fadeInUp 0.8s ease 1.2s forwards;
}

.first-title { text-align: right; }
.second-title { text-align: left; }

.first-title h1,
.second-title h1 {
  font-family: 'Poppins', sans-serif;
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  font-weight: 700;
  letter-spacing: -4px;
  line-height: 1;
}

.first-title h3,
.second-title h3 {
  font-family: 'Poppins', sans-serif;
  font-size: 0.5rem;
  color: #8C8C8C;
  font-weight: 400;
  letter-spacing: 1px;
  margin-top: 6px;
}

.profile-image-wrapper {
  width: clamp(120px, 10vw, 160px);
  height: clamp(160px, 13vw, 210px);
  border-radius: 10px;
  overflow: hidden;
  background: linear-gradient(180deg, #7F7FD5 0%, #86A8E7 30%, #78CAC4 65%, #FFFFFF 95%);
  flex-shrink: 0;
  opacity: 0;
  animation: fadeInUp 0.8s ease 1.4s forwards;
}

.profile-image-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top;
}

.profile-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Poppins', sans-serif;
  font-size: 2rem;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.85);
}

.bottom-main {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 24px;
  opacity: 0;
  animation: fadeInUp 0.8s ease 1.7s forwards;
}

.bottom-main p {
  font-family: 'Poppins', sans-serif;
  font-size: 0.5rem;
  color: #555;
}

.social-icons {
  display: flex;
  gap: 10px;
}

.social-icons a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border: 1.5px solid #333;
  border-radius: 50%;
  text-decoration: none;
  color: #333;
  transition: all 0.3s ease;
}

.social-icons a:hover {
  background: black;
  color: white;
  border-color: black;
}

/* ========== TALK BUTTON ========== */
.talk-btn-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 22vh;
}

/* gravity — 요소 자신이 직접 움직이는 경우 */
[data-gravity]:not([data-gravity-target]) {
  transition: transform 0.5s ease-out;
  transform: translate(var(--tx, 0px), var(--ty, 0px));
}

.talk-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 30px;
  border: 2px solid black;
  border-radius: 100px;
  background: transparent;
  font-family: 'Poppins', sans-serif;
  font-size: 0.5rem;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  color: black;
  transition: background 0.3s ease, color 0.3s ease, transform 0.5s ease-out;
  transform: translate(var(--tx, 0px), var(--ty, 0px));
}

.talk-btn:hover {
  background: black;
  color: white;
}

/* ========== DESCRIPTION ========== */
.description-section {
  display: flex;
  min-height: 70vh;
  align-items: center;
  justify-content: center;
  width: 100%;
}

.description {
  width: 75%;
  font-family: 'Poppins', sans-serif;
  font-size: 0.85rem;
  font-weight: 500;
  line-height: 1.9;
  text-align: justify;
}

.highlight {
  background: linear-gradient(black, black);
  background-size: 0 100%;
  background-repeat: no-repeat;
  border-radius: 8px;
  padding: 2px 10px;
  transition: background-size 0.8s ease-out, color 0.8s ease-out;
}

.highlight.active {
  background-size: 100% 100%;
  color: white;
}

.cv-link {
  color: black;
  font-weight: 600;
  text-decoration: none;
  border-bottom: 2px solid black;
  padding-bottom: 1px;
  transition: opacity 0.3s ease;
}

.cv-link:hover { opacity: 0.4; }

/* ========== SECTION TITLE ========== */
.section-title-wrapper {
  position: relative;
  width: 80%;
  font-family: 'Poppins', sans-serif;
}

.main-title-wrapper {
  overflow: hidden;
}

.section-title {
  font-size: 2rem;
  font-weight: 500;
  /* initial hidden state managed by GSAP */
}

.section-subtitle {
  font-size: 0.6rem;
  font-weight: 500;
  color: #666;
  margin-top: 4px;
}

/* ========== WORKS / CAROUSEL (GSAP 3D CYLINDER) ========== */
.works-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 80px 0 40px;
  width: 100%;
}

/* wrapper that holds the click zones + 3D stage */
.demoWrapper {
  position: relative;
  width: 100%;
  height: 520px;
  margin-top: 60px;
  overflow: visible;
}

/* left / right click zones — narrow so cards in center keep normal cursor */
.wrapperCursor {
  position: absolute;
  top: 0;
  height: 100%;
  width: 28%;
  z-index: 20;
  cursor: none; /* custom cursor shown via JS */
}
#wrapperCursor-left  { left: 0; }
#wrapperCursor-right { right: 0; }

/* cards themselves: normal cursor so links/text are usable */
.box { cursor: default; }

/* GSAP sets perspective + transformStyle on this element via JS */
.stage {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 240px;
  height: 400px;
  transform: translate(-50%, -50%);
}

/* all boxes stack at origin; GSAP sets rotationY + transformOrigin */
.box {
  position: absolute;
  top: 0;
  left: 0;
  width: 240px;
  height: 400px;
  border-radius: 28px;
  overflow: hidden;
  cursor: pointer;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.box-inner {
  position: absolute;
  inset: 0;
  border-radius: 28px;
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.box-bg-1 { background: linear-gradient(145deg, #667eea 0%, #764ba2 100%); }
.box-bg-2 { background: linear-gradient(160deg, #f5af19 0%, #f12711 100%); }
.box-bg-3 { background: linear-gradient(160deg, #0f0c29 0%, #302b63 50%, #24243e 100%); }
.box-bg-4 { background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%); }
.box-bg-5 { background: linear-gradient(135deg, #a18cd1 0%, #fbc2eb 100%); }

/* custom cursor arrows that follow the mouse */
.cursor-arrow {
  position: fixed;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: white;
  border: 2px solid black;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 2.4rem;
  line-height: 1;
  pointer-events: none;
  z-index: 9997;
  transform: translate(-50%, -50%);
}

.card-tag {
  font-family: 'Poppins', sans-serif;
  font-size: 0.35rem;
  font-weight: 600;
  letter-spacing: 2px;
  color: rgba(255, 255, 255, 0.75);
  text-transform: uppercase;
  margin-bottom: 6px;
}

.card-title {
  font-family: 'Poppins', sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: white;
  line-height: 1.1;
  margin-bottom: 10px;
}

.card-desc {
  font-family: 'Poppins', sans-serif;
  font-size: 0.38rem;
  color: rgba(255, 255, 255, 0.78);
  line-height: 1.6;
  margin-bottom: 16px;
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: white;
  text-decoration: none;
  font-family: 'Poppins', sans-serif;
  font-size: 0.38rem;
  font-weight: 600;
  border: 1.5px solid rgba(255, 255, 255, 0.65);
  border-radius: 50px;
  padding: 6px 14px;
  width: fit-content;
  transition: background 0.3s ease, color 0.3s ease;
  word-break: break-all;
}

.card-link:hover {
  background: white;
  color: #333;
}


/* ========== EDUCATION ========== */
.education-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 80px 0;
  width: 100%;
}

.edu-card {
  margin-top: 5%;
  width: 100%;
  display: flex;
  justify-content: center;
}

.edu-card > span {
  display: block;
  width: 80%;
  transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.card-wrapper {
  position: relative;
  padding: 50px 60px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  width: 100%;
  font-family: 'Poppins', sans-serif;
  border-radius: 30px;
  transition: box-shadow 0.5s ease;
}

.card-wrapper::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 30px;
  background: linear-gradient(49deg, rgba(127, 127, 213, 0.22) 0%, rgba(134, 168, 231, 0.22) 51%, rgba(145, 234, 228, 0.22) 100%);
  opacity: 0;
  transition: opacity 0.5s ease;
}

.edu-card:hover .card-wrapper::before { opacity: 1; }
.edu-card:hover .card-wrapper { box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08); }

.edu-item + .edu-item {
  margin-top: 50px;
}

.edu-year {
  font-size: 0.5rem;
  font-weight: 500;
  color: #8C8C8C;
}

.edu-degree {
  font-size: 1.1rem;
  font-weight: 500;
  padding-left: 20px;
  margin-top: 4px;
}

.edu-school {
  font-size: 0.55rem;
  font-weight: 500;
  color: #444;
  padding-left: 20px;
}

/* 3D tilt effect on edu card */
.button-3d {
  perspective: 1200px;
}

.button-3d > span {
  will-change: transform, filter;
  transition: transform 0.4s ease-out, filter 0.4s ease-out;
  transform: rotateY(0deg) rotateX(0deg) scale(1);
  display: block;
  border-radius: 30px;
}

/* ========== SOFT SKILLS ========== */
.soft-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 100px 0;
  width: 100%;
}

.soft-wrapper {
  margin-top: 80px;
  width: 100%;
  display: flex;
  justify-content: flex-end;
}

.soft-content {
  width: 65%;
  margin-right: 8%;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
}

.soft-item {
  font-family: 'Poppins', sans-serif;
  font-size: 0.7rem;
  font-weight: 500;
  margin-bottom: 9vh;
  position: relative;
}

.soft-item::after {
  content: '';
  position: absolute;
  border-radius: 10px;
  top: 8vh;
  left: 0;
  width: 0;
  height: 9px;
  background: linear-gradient(to right, #7f7fd5, #86a8e7, #91eae4);
  transition: width 0.8s ease-in-out;
}

.soft-item.active::after {
  width: 200%;
}

/* ========== HARD SKILLS (GSAP HORIZONTAL SCROLL) ========== */
.hard-section {
  width: 100%;
  overflow: hidden;
}

.section2 {
  width: 200vw;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 80px 10%;
  will-change: transform;
}

.line-skill {
  font-family: 'Poppins', sans-serif;
  font-size: clamp(2.5rem, 6vw, 7rem);
  font-weight: 700;
  white-space: nowrap;
  margin: 0.12em 0;
  display: flex;
  align-items: center;
  gap: 60px;
  letter-spacing: -2px;
  will-change: transform;
}

.text-skill {
  display: inline-block;
}
.text-skill + .text-skill::before {
  content: '/';
  margin-right: 60px;
  color: #ccc;
  font-weight: 300;
}

/* ========== CONTACT ========== */
.contact-section {
  margin-top: 30vh;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-bottom: 0;
}

#mail-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.contact-email-btn {
  width: 55%;
  background: linear-gradient(90deg, rgba(127, 127, 213, 0.75) -11.71%, rgba(134, 168, 231, 0.38) 48.4%, rgba(120, 202, 196, 0.04) 106.06%);
  border-radius: 155px;
  border: 2px solid #ACB2E7;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-family: 'Poppins', sans-serif;
  font-size: 0.65rem;
  font-weight: 500;
  padding: 20px 40px;
  transition: box-shadow 0.3s ease;
}

.contact-email-btn:hover {
  box-shadow: 0 4px 20px rgba(127, 127, 213, 0.3);
}

.email-text {
  background: linear-gradient(90deg, #000000 39.45%, rgba(0, 0, 0, 0.15) 106.69%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.copy-text {
  color: #8087E4;
}

.link-grid {
  margin-top: 8vh;
  display: grid;
  grid-template-columns: 40% repeat(3, 20%);
  grid-template-rows: repeat(2, 1fr);
  width: 80%;
  height: 20vh;
  font-family: 'Poppins', sans-serif;
  align-items: center;
}

.link-grid > p {
  font-size: 0.6rem;
  color: #8C8C8C;
  font-weight: 500;
}

.link-grid > p a {
  color: #8C8C8C;
  text-decoration: none;
}

#study {
  grid-row: 2;
}

.wrapper-gravity {
  padding: 5px;
}

.wrapper-gravity a,
.gravity-btn {
  font-size: 0.9rem;
  text-decoration: none;
  color: black;
  font-weight: 500;
  padding-left: 20%;
  display: inline-block;
  transition: transform 0.5s ease-out, opacity 0.2s ease-out;
  transform: translate(var(--tx, 0px), var(--ty, 0px));
}

.wrapper-gravity a:hover,
.gravity-btn:hover {
  opacity: 0.4;
}

/* ========== FOOTER LANDING ========== */
.footer-landing {
  border-top: 1px solid #eeeeee;
  margin-top: 120px;
}

.footer-landing .landing-page {
  justify-content: flex-start;
  padding-left: 10%;
  height: auto;
  padding-top: 80px;
  padding-bottom: 80px;
}

.footer-landing .first-title {
  position: static;
  transform: none;
  text-align: left;
  z-index: auto;
}

.footer-landing .first-title h1 {
  font-family: 'Poppins', sans-serif;
  font-size: clamp(2.5rem, 8vw, 6rem);
  font-weight: 700;
  letter-spacing: -3px;
  line-height: 1.1;
  text-align: left;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 1000px) {
  header {
    display: flex;
    align-items: center;
    padding: 0 30px;
  }

  .nav-bar { display: none; }
  .hamburger-btn { display: flex; }
  .mobile-menu { display: flex; }

  .first-title h1, .second-title h1 {
    font-size: 2.2rem;
    letter-spacing: -2px;
  }

  .soft-content {
    width: 85%;
    margin-right: 5%;
  }

  .soft-item::after {
    width: 0;
  }

  .soft-item.active::after {
    width: 180%;
  }

  .contact-section { margin-top: 15vh; }

  #mail-wrapper {
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
  }

  .contact-email-btn {
    width: 100%;
    font-size: 0.55rem;
    padding: 16px 24px;
  }

  .link-grid {
    display: flex;
    flex-direction: column;
    align-items: center;
    height: auto;
    gap: 24px;
    margin-top: 40px;
  }

  .wrapper-gravity a {
    padding-left: 0;
  }

  .card-wrapper {
    padding: 30px;
    width: 90%;
  }

  .description { width: 88%; }
}

@media (max-width: 600px) {
  .main-photo { gap: 16px; }

  .first-title h1, .second-title h1 {
    font-size: 1.8rem;
    letter-spacing: -1px;
  }

  .profile-image-wrapper {
    width: 90px;
    height: 130px;
  }

  .profile-placeholder { font-size: 1.4rem; }

  .section-title { font-size: 1.5rem; }

  /* mobile carousel — show boxes in a horizontal scrollable strip */
  .demoWrapper {
    height: auto;
    overflow-x: auto;
    overflow-y: visible;
    padding-bottom: 20px;
  }
  .wrapperCursor { display: none; }
  .stage {
    position: relative;
    left: auto;
    top: auto;
    transform: none;
    width: auto;
    height: 340px;
    display: flex;
    gap: 20px;
    padding: 0 20px;
  }
  .box {
    position: relative;
    width: 200px;
    height: 340px;
    flex-shrink: 0;
    transform: none !important;
  }

  /* mobile hard skills — simple vertical list */
  .hard-section { overflow: visible; }
  .section2 {
    width: 100%;
    min-height: auto;
    padding: 60px 8%;
  }
  .line-skill {
    font-size: clamp(1.6rem, 8vw, 3rem);
    flex-wrap: wrap;
    gap: 20px;
    white-space: normal;
  }
}