:root {
  --bg: #050816;
  --bg-alt: #0f172a;
  --card: #020617;
  --accent: #38bdf8;
  --accent-soft: rgba(56, 189, 248, 0.1);
  --text: #e5e7eb;
  --muted: #9ca3af;
  --radius-xl: 18px;
  --radius-2xl: 26px;
  --shadow-soft: 0 18px 45px rgba(15, 23, 42, 0.8);
  --transition: 0.2s ease-out;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #0f172a 0, #020617 55%, #020617 100%);
  color: var(--text);
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 24px 16px 80px;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 8px 32px;
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: linear-gradient(
    to bottom,
    rgba(2, 6, 23, 0.92),
    rgba(2, 6, 23, 0.6),
    transparent
  );
}

.logo {
  font-weight: 700;
  letter-spacing: 0.08em;
  font-size: 0.9rem;
  text-transform: uppercase;
  color: var(--muted);
}

nav a {
  margin-left: 16px;
  font-size: 0.9rem;
  color: var(--muted);
  position: relative;
}

.language-switch {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: 24px;
}

.language-switch::before {
  content: attr(aria-label);
  font-size: 0.75rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.language-option {
  border: 1px solid rgba(56, 189, 248, 0.3);
  background: transparent;
  color: var(--muted);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}

.language-option.active {
  background: var(--accent);
  color: #04111f;
}

nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 999px;
  transition: width var(--transition);
}

nav a:hover::after {
  width: 100%;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
  gap: 40px;
  align-items: center;
  margin-bottom: 64px;
}

.hero-photo {
  position: relative;
  border-radius: var(--radius-2xl);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(56, 189, 248, 0.24);
}

.hero-photo::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, rgba(56, 189, 248, 0.1), transparent 65%);
  pointer-events: none;
}

.hero-photo img {
  width: 100%;
  display: block;
}

.hero-content {
  display: grid;
  gap: 18px;
}

.hero-title {
  font-size: clamp(2.2rem, 4vw, 3rem);
  font-weight: 800;
}

.hero-subtitle {
  color: var(--muted);
  max-width: 620px;
}

.hero-description {
  color: var(--muted);
  max-width: 640px;
  line-height: 1.7;
  display: grid;
  gap: 12px;
}

.hero-description p {
  margin: 0;
}

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

@media (max-width: 800px) {
  header {
    flex-direction: column;
    gap: 12px;
  }

  nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
  }

  nav a {
    margin: 0 8px;
  }

  .language-switch {
    margin-left: 0;
    justify-content: center;
  }

  .hero {
    grid-template-columns: minmax(0, 1fr);
    text-align: center;
  }

  .hero-photo {
    max-width: 320px;
    margin: 0 auto;
  }

  .hero-content {
    justify-items: center;
  }

  .hero-links {
    justify-content: center;
  }
}

.about {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.5fr);
  gap: 40px;
  align-items: center;
  margin-bottom: 64px;
}

.about-photo {
  position: relative;
  border-radius: var(--radius-2xl);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(56, 189, 248, 0.24);
}

.about-photo::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, rgba(56, 189, 248, 0.1), transparent 65%);
  pointer-events: none;
}

.about-photo img {
  width: 100%;
  display: block;
}

.about-content p + p {
  margin-top: 16px;
}

@media (max-width: 800px) {
  .about {
    grid-template-columns: minmax(0, 1fr);
  }

  .about-photo {
    max-width: 320px;
  }
}

.link-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.12);
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
  transition: transform var(--transition), box-shadow var(--transition);
}

.link-pill:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(56, 189, 248, 0.16);
}

.link-pill--ghost {
  background: rgba(148, 163, 184, 0.16);
  color: var(--muted);
  font-weight: 500;
  cursor: default;
}

.link-pill--ghost:hover {
  transform: none;
  box-shadow: none;
}

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  margin-bottom: 8px;
}

.section-subtitle {
  color: var(--muted);
  margin-bottom: 28px;
}

.filter-bar {
  display: flex;
  gap: 12px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 8px 18px;
  border-radius: 999px;
  border: 1px solid rgba(56, 189, 248, 0.28);
  background: rgba(56, 189, 248, 0.08);
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
  transition: background var(--transition), color var(--transition);
  cursor: pointer;
}

.filter-btn.disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.filter-btn.active {
  background: var(--accent);
  color: #04111f;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.project-card {
  position: relative;
  background: radial-gradient(circle at top, rgba(15, 23, 42, 0.92), rgba(2, 6, 23, 0.96));
  border-radius: var(--radius-xl);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  box-shadow: 0 30px 60px rgba(2, 6, 23, 0.85);
  border: 1px solid rgba(56, 189, 248, 0.2);
  overflow: hidden;
  isolation: isolate;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.project-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(120deg, rgba(56, 189, 248, 0.2), rgba(99, 102, 241, 0.2), transparent 65%);
  opacity: 0.9;
  z-index: -2;
}

.project-card::after {
  content: "";
  position: absolute;
  inset: 1px;
  border-radius: inherit;
  border: 1px solid rgba(56, 189, 248, 0.18);
  z-index: -1;
  pointer-events: none;
}

.project-card:hover {
  transform: translateY(-8px);
  border-color: rgba(56, 189, 248, 0.5);
  box-shadow: 0 35px 70px rgba(2, 6, 23, 0.9);
}

.project-type {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.project-title {
  font-size: 1.3rem;
  font-weight: 700;
}

.project-desc {
  color: var(--muted);
}

.project-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.project-tag {
  background: rgba(148, 163, 184, 0.14);
  color: var(--muted);
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 0.75rem;
}

.project-footer {
  margin-top: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.link-pill--footer {
  background: rgba(56, 189, 248, 0.18);
}

.project-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  align-self: flex-start;
}

.status-progress {
  background: rgba(250, 204, 21, 0.12);
  color: #facc15;
  border: 1px solid rgba(250, 204, 21, 0.4);
}

.hidden {
  display: none !important;
}

.android {
  margin-top: 80px;
}

.android-grid {
  display: grid;
  gap: 32px;
}

.android-case {
  background: rgba(15, 23, 42, 0.72);
  border-radius: var(--radius-2xl);
  padding: 30px;
  border: 1px solid rgba(56, 189, 248, 0.18);
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.android-case header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
}

.android-case h3 {
  font-size: 1.4rem;
  font-weight: 700;
}

.pill {
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.16);
  color: var(--accent);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.android-body {
  display: grid;
  gap: 24px;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
  align-items: center;
}

.android-body img {
  width: 100%;
  border-radius: var(--radius-xl);
  border: 1px solid rgba(56, 189, 248, 0.24);
}

.android-case ul {
  list-style: none;
  display: grid;
  gap: 10px;
  color: var(--muted);
}

.android-case ul li::before {
  content: "•";
  margin-right: 8px;
  color: var(--accent);
}

.android-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

@media (max-width: 880px) {
  .android-body {
    grid-template-columns: minmax(0, 1fr);
  }
}

.split-layout {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.card-panel {
  background: rgba(15, 23, 42, 0.7);
  border-radius: var(--radius-xl);
  padding: 24px;
  border: 1px solid rgba(56, 189, 248, 0.14);
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.card-panel h3 {
  font-size: 1rem;
  font-weight: 700;
}

.resource-list {
  list-style: none;
  display: grid;
  gap: 10px;
}

.resource-list a {
  color: var(--accent);
  font-weight: 600;
}

.error-list {
  list-style: none;
  display: grid;
  gap: 10px;
}

.error-list li::before {
  content: "•";
  margin-right: 10px;
  color: var(--accent);
}

.terminal-demo {
  background: #020617;
  border: 1px solid rgba(56, 189, 248, 0.24);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-soft);
  padding: 24px;
  font-family: "Fira Code", "Source Code Pro", monospace;
  color: var(--text);
  position: relative;
  overflow: hidden;
}

.terminal-demo::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(56, 189, 248, 0.08), transparent 45%);
  pointer-events: none;
}

.terminal-header {
  display: flex;
  gap: 6px;
  margin-bottom: 18px;
}

.terminal-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(148, 163, 184, 0.4);
}

.terminal-body {
  display: grid;
  gap: 8px;
}

.terminal-line {
  opacity: 0;
  transform: translateY(6px);
  animation: reveal-line 0.6s forwards;
}

.terminal-line:nth-child(1) {
  animation-delay: 0.2s;
}

.terminal-line:nth-child(2) {
  animation-delay: 0.8s;
}

.terminal-line:nth-child(3) {
  animation-delay: 1.4s;
}

.terminal-line:nth-child(4) {
  animation-delay: 2.1s;
}

.terminal-line span {
  color: #22c55e;
}

@keyframes reveal-line {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.playground-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.playground-card {
  background: rgba(15, 23, 42, 0.7);
  border-radius: var(--radius-xl);
  padding: 24px;
  border: 1px solid rgba(56, 189, 248, 0.14);
  box-shadow: var(--shadow-soft);
}

.playground-code {
  background: rgba(15, 23, 42, 0.9);
  border-radius: 12px;
  padding: 18px;
  font-family: "Fira Code", "Source Code Pro", monospace;
  font-size: 0.85rem;
  overflow-x: auto;
}

.contact-section {
  text-align: center;
  margin-top: 80px;
}

.contact-title {
  margin-bottom: 24px;
}

.contact-box {
  background: rgba(15, 23, 42, 0.72);
  border-radius: var(--radius-2xl);
  padding: 26px;
  border: 1px solid rgba(56, 189, 248, 0.16);
  box-shadow: var(--shadow-soft);
  display: grid;
  gap: 16px;
  justify-items: center;
  text-align: center;
}

#contact .section-subtitle {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

.contact-label {
  font-weight: 600;
  color: var(--muted);
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.contact-pill {
  background: rgba(56, 189, 248, 0.08);
  border-radius: 999px;
  padding: 10px 18px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
  transition: transform var(--transition);
}

.contact-pill img,
.link-pill img {
  display: block;
  width: 18px;
  height: 18px;
  object-fit: contain;
  flex-shrink: 0;
}

.contact-pill:hover {
  transform: translateY(-2px);
}

footer {
  text-align: center;
  padding: 48px 0 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.empty-state {
  color: rgba(148, 163, 184, 0.8);
  font-size: 0.9rem;
  background: rgba(15, 23, 42, 0.6);
  border-radius: var(--radius-xl);
  padding: 18px;
  border: 1px dashed rgba(56, 189, 248, 0.24);
}