/* ===== CSS Variables (Aurora-inspired dark) ===== */
:root {
  --bg: #06091c;
  --bg-soft: #0a1130;
  --surface: rgba(255,255,255,.05);
  --surface-2: rgba(255,255,255,.08);
  --border: rgba(180,220,255,.14);
  --text-1: #e8f0ff;
  --text-2: #b4c4e4;
  --text-3: #6a7a9e;
  --accent: #5ef2c6;
  --accent-2: #7aa2ff;
  --accent-3: #c984ff;
  --grad: linear-gradient(135deg,#5ef2c6,#7aa2ff 50%,#c984ff);
  --grad-soft: linear-gradient(135deg,rgba(94,242,198,.2),rgba(201,132,255,.2));
  --radius: 20px;
  --radius-sm: 14px;
  --radius-lg: 28px;
  --shadow: 0 20px 60px rgba(0,0,0,.4), inset 0 1px 0 rgba(255,255,255,.06);
  --shadow-lg: 0 30px 80px rgba(0,0,0,.55);
  --font-sans: 'Inter', 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans SC', sans-serif;
  --anim-dur: .7s;
  --anim-ease: cubic-bezier(.4,0,.2,1);
}

/* ===== Aurora gradient background ===== */
body {
  background:
    radial-gradient(60% 50% at 20% 10%, rgba(94,242,198,.18), transparent 70%),
    radial-gradient(55% 50% at 80% 20%, rgba(122,162,255,.16), transparent 70%),
    radial-gradient(70% 60% at 50% 100%, rgba(201,132,255,.14), transparent 70%),
    #06091c;
  font-family: var(--font-sans);
  color: var(--text-1);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background: rgba(122,162,255,.35);
  color: #fff;
}

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

html {
  scroll-behavior: smooth;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ===== Glass Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  transition: background .4s, backdrop-filter .4s, border-color .4s;
}

.header.scrolled {
  background: rgba(6,9,28,.78);
  backdrop-filter: blur(24px) saturate(160%);
  -webkit-backdrop-filter: blur(24px) saturate(160%);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: .02em;
  background: var(--grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: 36px;
}

.nav-link {
  font-size: .85rem;
  color: var(--text-3);
  transition: color .3s;
  position: relative;
  letter-spacing: .04em;
  font-weight: 500;
}

.nav-link:hover { color: var(--text-2); }
.nav-link.active { color: var(--text-1); }

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 50%;
  width: 0;
  height: 1.5px;
  background: var(--grad);
  transition: width .35s ease, left .35s ease;
  border-radius: 2px;
}

.nav-link.active::after {
  width: 100%;
  left: 0;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-1);
  transition: .3s;
  border-radius: 2px;
}

/* ===== Sections ===== */
.section {
  padding: 120px 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.section-title {
  font-size: 2.4rem;
  font-weight: 800;
  margin-bottom: 12px;
  text-align: center;
  letter-spacing: -.02em;
  background: var(--grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-desc {
  text-align: center;
  color: var(--text-3);
  margin-bottom: 56px;
  font-size: 1rem;
  letter-spacing: .02em;
}

/* ===== Hero ===== */
.hero {
  text-align: center;
  min-height: 100vh;
}

.hero-content {
  max-width: 780px;
}

.hero-title {
  font-size: 3.8rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -.03em;
  color: var(--text-1);
}

.gradient-text {
  background: var(--grad);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: kf-gradflow 4s linear infinite;
}

.hero-subtitle {
  font-size: 1.3rem;
  color: var(--text-2);
  margin-bottom: 10px;
  font-weight: 400;
  letter-spacing: .04em;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-3);
  margin-bottom: 44px;
  font-weight: 300;
}

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 36px;
  border-radius: var(--radius-sm);
  font-size: .9rem;
  font-weight: 600;
  transition: all .4s cubic-bezier(.25,.46,.45,.94);
  cursor: pointer;
  border: none;
  letter-spacing: .02em;
}

.btn-primary {
  background: var(--grad);
  color: #06091c;
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(122,162,255,.3);
}

.btn-secondary {
  background: transparent;
  color: var(--text-2);
  border: 1px solid var(--border);
  backdrop-filter: blur(4px);
}

.btn-secondary:hover {
  border-color: rgba(255,255,255,.25);
  background: var(--surface);
  transform: translateY(-3px);
}

/* ===== About ===== */
.about-content {
  max-width: 720px;
  margin: 0 auto;
}

.about-text p {
  color: var(--text-2);
  margin-bottom: 18px;
  font-size: 1.05rem;
  line-height: 1.8;
}

.about-text p:first-child {
  font-size: 1.2rem;
  color: var(--text-1);
  font-weight: 500;
}

.about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 32px;
}

.tag {
  padding: 8px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: .82rem;
  color: var(--text-2);
  transition: all .3s;
  letter-spacing: .02em;
  backdrop-filter: blur(8px);
}

.tag:hover {
  background: var(--surface-2);
  border-color: rgba(94,242,198,.25);
  color: var(--accent);
  transform: translateY(-2px);
}

/* ===== Works Grid ===== */
.works-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.work-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  background: var(--surface);
  border: 1px solid var(--border);
  transition: all .5s cubic-bezier(.25,.46,.45,.94);
  transform-style: preserve-3d;
}

.work-card:hover {
  transform: translateY(-8px) scale(1.01);
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(94,242,198,.12);
  border-color: rgba(94,242,198,.2);
}

.work-thumb {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: #0a1130;
  transition: transform .6s ease;
}

.work-card:hover .work-thumb {
  transform: scale(1.04);
}

.work-info {
  padding: 18px 20px 20px;
}

.work-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--text-1);
  letter-spacing: .01em;
}

.work-desc {
  font-size: .82rem;
  color: var(--text-3);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.5;
}

.work-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.work-tags .tag {
  font-size: .7rem;
  padding: 3px 10px;
  background: rgba(255,255,255,.03);
  border-color: rgba(255,255,255,.06);
}

.work-play-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
  width: 60px;
  height: 60px;
  background: rgba(6,9,28,.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: all .4s;
  border: 1px solid rgba(255,255,255,.1);
}

.work-card:hover .work-play-icon {
  opacity: 1;
  transform: translate(-50%,-50%) scale(1.05);
}

.work-play-icon::after {
  content: '';
  display: block;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent #fff;
  margin-left: 4px;
}

/* ===== Modal ===== */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 200;
  align-items: center;
  justify-content: center;
}

.modal.open {
  display: flex;
  animation: modalFadeIn .3s ease;
}

@keyframes modalFadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.modal-content {
  position: relative;
  width: 90%;
  max-width: 960px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  animation: modalSlideUp .35s cubic-bezier(.25,.46,.45,.94);
}

@keyframes modalSlideUp {
  from { opacity: 0; transform: translateY(30px) scale(.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-close {
  position: absolute;
  top: -44px;
  right: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-1);
  font-size: 1.5rem;
  cursor: pointer;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all .3s;
  z-index: 1;
  border-radius: 50%;
  line-height: 1;
}

.modal-close:hover {
  background: var(--surface-2);
  transform: rotate(90deg);
}

.modal-video-wrapper {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
  border-radius: var(--radius) var(--radius) 0 0;
  overflow: hidden;
  position: relative;
}

.modal-video-wrapper iframe {
  width: 100%;
  height: 100%;
  display: block;
  border: none;
}

#modalVideo {
  width: 100%;
  height: 100%;
  display: block;
}

.modal-info {
  background: rgba(10,17,48,.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 22px 28px;
  border-radius: 0 0 var(--radius) var(--radius);
  border-top: 1px solid var(--border);
}

.modal-info h3 {
  font-size: 1.2rem;
  margin-bottom: 6px;
  font-weight: 600;
  color: var(--text-1);
}

.modal-info p {
  font-size: .9rem;
  color: var(--text-3);
}

/* ===== Contact ===== */
.contact-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  max-width: 600px;
  margin: 0 auto;
}

.contact-item {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: .92rem;
  color: var(--text-2);
  transition: all .4s cubic-bezier(.25,.46,.45,.94);
  letter-spacing: .02em;
  backdrop-filter: blur(8px);
}

.contact-item:hover {
  background: rgba(122,162,255,.08);
  border-color: rgba(122,162,255,.2);
  color: var(--text-1);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(122,162,255,.12);
}

/* ===== Footer ===== */
.footer {
  padding: 40px 0;
  text-align: center;
  border-top: 1px solid var(--border);
  color: var(--text-3);
  font-size: .82rem;
  letter-spacing: .02em;
}

/* =============================================
   CSS Animations (from html-ppt-skill)
   ============================================= */

/* Fade directional */
@keyframes kf-fade-up{from{opacity:0;transform:translateY(32px)}to{opacity:1;transform:none}}
@keyframes kf-fade-down{from{opacity:0;transform:translateY(-32px)}to{opacity:1;transform:none}}
@keyframes kf-fade-left{from{opacity:0;transform:translateX(-40px)}to{opacity:1;transform:none}}
@keyframes kf-fade-right{from{opacity:0;transform:translateX(40px)}to{opacity:1;transform:none}}
.anim-fade-up{animation:kf-fade-up var(--anim-dur) var(--anim-ease) both}
.anim-fade-down{animation:kf-fade-down var(--anim-dur) var(--anim-ease) both}
.anim-fade-left{animation:kf-fade-left var(--anim-dur) var(--anim-ease) both}
.anim-fade-right{animation:kf-fade-right var(--anim-dur) var(--anim-ease) both}

/* Rise / drop / zoom / blur */
@keyframes kf-rise{from{opacity:0;transform:translateY(60px) scale(.97);filter:blur(6px)}to{opacity:1;transform:none;filter:none}}
@keyframes kf-drop{from{opacity:0;transform:translateY(-60px) scale(.97)}to{opacity:1;transform:none}}
@keyframes kf-zoom{0%{opacity:0;transform:scale(.6)}60%{transform:scale(1.04)}100%{opacity:1;transform:scale(1)}}
@keyframes kf-blur{from{opacity:0;filter:blur(18px)}to{opacity:1;filter:none}}
.anim-rise-in{animation:kf-rise .9s var(--anim-ease) both}
.anim-drop-in{animation:kf-drop .8s var(--anim-ease) both}
.anim-zoom-pop{animation:kf-zoom .7s cubic-bezier(.22,1.3,.36,1) both}
.anim-blur-in{animation:kf-blur .8s var(--anim-ease) both}

/* Gradient flow text */
@keyframes kf-gradflow{to{background-position:200% 0}}

/* Stagger list */
.anim-stagger-list > *{opacity:0;animation:kf-rise .65s var(--anim-ease) both}
.anim-stagger-list > *:nth-child(1){animation-delay:.05s}
.anim-stagger-list > *:nth-child(2){animation-delay:.15s}
.anim-stagger-list > *:nth-child(3){animation-delay:.25s}
.anim-stagger-list > *:nth-child(4){animation-delay:.35s}
.anim-stagger-list > *:nth-child(5){animation-delay:.45s}
.anim-stagger-list > *:nth-child(6){animation-delay:.55s}
.anim-stagger-list > *:nth-child(7){animation-delay:.65s}
.anim-stagger-list > *:nth-child(8){animation-delay:.75s}
.anim-stagger-list > *:nth-child(n+9){animation-delay:.85s}

/* Parallax tilt on hover */
.anim-parallax-tilt{transform-style:preserve-3d;transition:transform .4s var(--anim-ease)}
.anim-parallax-tilt:hover{transform:perspective(900px) rotateX(4deg) rotateY(-6deg) translateZ(10px)}

/* Neon glow accent */
@keyframes kf-neon{0%,100%{text-shadow:0 0 8px var(--accent),0 0 20px var(--accent)}50%{text-shadow:0 0 16px var(--accent),0 0 40px var(--accent),0 0 80px var(--accent)}}

/* ===== Work card scroll reveal ===== */
.work-card {
  transition: opacity .6s ease, transform .6s ease, box-shadow .5s, border-color .5s;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .hero-title { font-size: 2.4rem; }
  .hero-subtitle { font-size: 1.05rem; }
  .section-title { font-size: 1.8rem; }

  .nav-links {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(6,9,28,.95);
    backdrop-filter: blur(20px);
    padding: 20px 28px;
    gap: 18px;
    border-bottom: 1px solid var(--border);
  }
  .nav-links.open { display: flex; }
  .menu-toggle { display: flex; }

  .works-grid { grid-template-columns: repeat(2, 1fr); }
  .section { padding: 80px 0; min-height: auto; }
}

@media (max-width: 480px) {
  .hero-title { font-size: 1.9rem; }
  .works-grid { grid-template-columns: 1fr; }
  .contact-links { flex-direction: column; align-items: center; }
  .section { padding: 64px 0; }
}