:root {
  --bg: #0b0f17;
  /* base dark */
  --card: #111827aa;
  /* glass dark */
  --text: #e5e7eb;
  /* gray-200 */
  --muted: #9ca3af;
  /* gray-400 */
  --primary: #7c3aed;
  /* violet-600 */
  --primary-2: #06b6d4;
  /* cyan-500 */
  --accent: #22d3ee;
  /* cyan-400 */
  --ring: rgba(124, 58, 237, .35);
}

* {
  box-sizing: border-box
}

html,
body {
  height: 100%
}

body {
  margin: 0;
  font-family: "Poppins", system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, "Helvetica Neue", Arial;
  background: radial-gradient(1200px 800px at 10% -10%, rgba(124, 58, 237, .15), transparent),
    radial-gradient(1000px 700px at 110% 10%, rgba(6, 182, 212, .12), transparent),
    var(--bg);
  color: var(--text);
}

/* layout */
.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: 260px;
  background: rgba(10, 12, 20, .7);
  backdrop-filter: blur(10px);
  border-right: 1px solid rgba(255, 255, 255, .06);
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 24px 18px;
  z-index: 999;
}

.sidebar .brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: .3px
}

.sidebar .brand i {
  font-size: 24px;
  color: var(--accent)
}

.sidebar .menu {
  display: flex;
  flex-direction: column;
  gap: 8px
}

.menu-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  color: var(--muted);
  text-decoration: none;
  border-radius: 10px;
  transition: .2s
}

.menu-link i {
  font-size: 20px
}

.menu-link:hover,
.menu-link.active {
  color: var(--text);
  background: rgba(255, 255, 255, .06);
  box-shadow: 0 0 0 2px rgba(255, 255, 255, .03) inset
}

.toggle {
  margin-top: auto;
  border: 1px solid rgba(255, 255, 255, .08);
  background: transparent;
  color: var(--text);
  border-radius: 10px;
  padding: 10px;
  cursor: pointer
}

.content {
  margin-left: 260px;
  padding: 40px 32px;
  max-width: 1200px
}

/* backdrop overlay */
.backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: 998;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.backdrop.active {
  opacity: 1;
  visibility: visible;
}

/* sections */
.section {
  padding: 64px 0
}

.section-title {
  margin: 0 0 28px;
  font-size: 28px
}

/* hero */
.hero {
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 28px;
  align-items: center
}

.hero-text h1 {
  margin: 0 0 12px;
  font-size: 40px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent
}

.hero-text p {
  margin: 0 0 24px;
  color: var(--muted)
}

.hero-actions {
  display: flex;
  gap: 12px
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  color: var(--text);
  border: 1px solid rgba(255, 255, 255, .12);
  padding: 10px 16px;
  border-radius: 12px;
  transition: .2s
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 18px -6px rgba(0, 0, 0, .6)
}

.btn.primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  border-color: transparent
}

.btn.ghost {
  background: transparent
}

.btn.tiny {
  padding: 8px 12px;
  font-size: 14px
}

.btn.stretch {
  width: 100%
}

.hero-media .glass-card {
  border-radius: 16px;
  padding: 10px;
  background: linear-gradient(135deg, rgba(124, 58, 237, .18), rgba(6, 182, 212, .18));
  border: 1px solid rgba(255, 255, 255, .12);
  box-shadow: 0 10px 40px -15px rgba(124, 58, 237, .35)
}

.hero-media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 12px
}

/* about */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 24px
}

.about-card {
  background: var(--card);
  border: 1px solid rgba(255, 255, 255, .08);
  border-radius: 14px;
  padding: 20px
}

.about-card h2 {
  margin: 0 0 10px
}

.about-card p {
  margin: 0;
  color: var(--muted)
}

.about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px
}

.about-stats li {
  background: linear-gradient(180deg, rgba(255, 255, 255, .06), rgba(255, 255, 255, .02));
  border: 1px solid rgba(255, 255, 255, .08);
  border-radius: 14px;
  padding: 14px;
  text-align: center
}

.about-stats .num {
  display: block;
  font-size: 28px;
  font-weight: 700;
  color: var(--accent)
}

.about-stats .label {
  display: block;
  color: var(--muted);
  font-size: 13px
}

/* skills */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px
}

.skill {
  background: var(--card);
  border: 1px solid rgba(255, 255, 255, .08);
  border-radius: 14px;
  padding: 16px
}

.skill i {
  font-size: 28px;
  color: var(--accent)
}

.skill h3 {
  margin: 8px 0 10px;
  font-size: 16px
}

.bar {
  height: 8px;
  background: rgba(255, 255, 255, .06);
  border-radius: 999px;
  overflow: hidden
}

.bar span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent))
}

/* work */
.work-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px
}

.work-card {
  position: relative;
  overflow: hidden;
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, .08);
  background: rgba(255, 255, 255, .03)
}

.work-card img {
  display: block;
  width: 100%;
  height: auto;
  transition: transform .35s ease
}

.work-card:hover img {
  transform: scale(1.06)
}

.work-info {
  position: absolute;
  inset: auto 0 0 0;
  background: linear-gradient(180deg, transparent, rgba(0, 0, 0, .65));
  padding: 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px
}

.work-info h3 {
  margin: 0;
  font-size: 16px
}

/* contact */
.contact-form {
  background: var(--card);
  border: 1px solid rgba(255, 255, 255, .08);
  border-radius: 14px;
  padding: 18px
}

.contact-form .row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 12px
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  background: rgba(255, 255, 255, .04);
  color: var(--text);
  border: 1px solid rgba(255, 255, 255, .1);
  border-radius: 12px;
  padding: 12px 14px;
  outline: none
}

.contact-form input:focus,
.contact-form textarea:focus {
  box-shadow: 0 0 0 3px var(--ring);
  border-color: transparent
}

/* footer */
.footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 36px 0;
  color: var(--muted);
  border-top: 1px solid rgba(255, 255, 255, .06);
  margin-top: 40px;
}

.footer p {
  margin: 0;
  font-size: 14px;
}

.to-top {
  display: inline-flex;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  text-decoration: none;
  color: var(--text);
  border: 1px solid rgba(255, 255, 255, .12);
  transition: all 0.2s ease;
  flex-shrink: 0;
}

.to-top:hover {
  background: rgba(255, 255, 255, .06);
  transform: translateY(-2px);
}

/* sidebar collapsed state */
.sidebar.collapsed {
  width: 78px !important;
}

.sidebar.collapsed .menu-link span,
.sidebar.collapsed .brand span {
  display: none;
}

.sidebar.collapsed .menu-link {
  justify-content: center;
  padding: 10px;
}

.sidebar.collapsed .brand {
  justify-content: center;
}

/* responsive */
@media (max-width: 1024px) {
  .skills-grid {
    grid-template-columns: repeat(2, 1fr)
  }

  .work-grid {
    grid-template-columns: repeat(2, 1fr)
  }
}

@media (max-width: 860px) {
  .sidebar {
    width: 78px
  }

  .content {
    margin-left: 78px
  }

  .menu-link span {
    display: none
  }

  .brand span {
    display: none
  }

  .menu-link {
    justify-content: center;
    padding: 10px
  }

  .brand {
    justify-content: center
  }

  .backdrop {
    display: block
  }
}

@media (min-width: 861px) {
  .backdrop {
    display: none
  }
}

@media (max-width: 720px) {
  .hero {
    grid-template-columns: 1fr
  }

  .about-grid {
    grid-template-columns: 1fr
  }

  .contact-form .row {
    grid-template-columns: 1fr
  }

  .footer {
    flex-direction: column;
    gap: 16px;
    text-align: center;
    padding: 24px 0;
  }

  .footer p {
    margin: 0;
    order: 2;
  }

  .to-top {
    order: 1;
    align-self: center;
  }
}

@media (max-width: 480px) {
  .content {
    padding: 20px 16px
  }

  .section {
    padding: 40px 0
  }

  .hero-text h1 {
    font-size: 32px
  }

  .section-title {
    font-size: 24px
  }

  .footer {
    padding: 20px 0;
    gap: 12px;
  }

  .footer p {
    font-size: 13px;
  }

  .to-top {
    width: 36px;
    height: 36px;
  }

  .hero-actions {
    flex-direction: column;
    gap: 8px;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }
}