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

:root {
  --bg: #080a0e;
  --surface: #0f1117;
  --surface2: #161b24;
  --border: rgba(255, 255, 255, 0.06);
  --border-hover: rgba(91, 140, 255, 0.3);
  --accent: #5b8cff;
  --accent2: #3dffd0;
  --accent-glow: rgba(91, 140, 255, 0.15);
  --text: #e8eaf0;
  --muted: #52576a;
  --danger: #ff6b6b;
  --danger-bg: rgba(255, 107, 107, 0.08);
  --success: #3dffd0;
  --success-bg: rgba(61, 255, 208, 0.06);
  --mono: 'DM Mono', monospace;
}

body {
  font-family: 'Sora', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 10vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 80px 16px 32px;
  position: relative;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(91, 140, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(91, 140, 255, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

body::after {
  content: '';
  position: fixed;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(91, 140, 255, 0.08) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}



.project-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 200;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  background: rgba(10, 10, 15, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid #1e1e2e;
  font-family: 'DM Mono', monospace;
}

.project-nav::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 28px;
  width: 60px;
  height: 1px;
  background: var(--accent);
}

.nav-home {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: #e8e8f0;
  text-decoration: none;
  transition: color 0.2s;
}

.nav-home svg {
  color: var(--accent);
  transition: transform 0.2s;
}

.nav-home:hover {
  color: var(--accent);
}

.nav-home:hover svg {
  transform: translateX(-3px);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2.5rem;
  list-style: none;
  margin: 0 auto;
}

.nav-links a {
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s;
}

.nav-links a:hover {
  color: var(--accent);
}

.nav-links a:hover::after {
  transform: scaleX(1);
}


/* ── LANGUAGE TOGGLE ── */
.lang-toggle {
  display: flex;
  align-items: center;
  gap: 2px;
}

.lang-btn {
  padding: 0.22rem 0.52rem;
  font-family: var(--sans);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  border-radius: 5px;
  cursor: pointer;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-faint);
  transition: background 0.2s, color 0.2s, border-color 0.2s;
  line-height: 1;
}

.lang-btn:hover {
  color: var(--accent);
  border-color: rgba(0, 229, 195, 0.3);
}

.lang-btn.active {
  background: rgba(0, 229, 195, 0.12);
  border-color: rgba(0, 229, 195, 0.35);
  color: var(--accent);
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes tick {
  from {
    opacity: 0.3;
    transform: translateY(-5px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes popIn {
  0% {
    transform: scale(0.8);
    opacity: 0;
  }

  70% {
    transform: scale(1.05);
  }

  100% {
    transform: scale(1);
    opacity: 1;
  }
}

/* ── Mobile Buttons ── */
.mobile-nav-btns {
  display: none;
}

.back-btn,
.authors-btn {
  display: inline-flex;
}

/* ─── Mobile Nav: bis 600px ──────────────────────── */
@media (max-width: 600px) {

  .project-nav {
    padding: 0 16px;
  }

  .nav-links {
    display: none;
  }

  .mobile-nav-btns {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    align-self: flex-start;
    margin-bottom: 3vh;
  }

  .back-btn,
  .authors-btn {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 8px 16px;
    font-family: 'DM Mono', monospace;
    font-size: 0.68rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    text-decoration: none;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 2px;
    position: relative;
    overflow: hidden;
    transition: border-color 0.25s, box-shadow 0.25s, transform 0.25s, background 0.25s;
    animation: fadeUp 0.5s ease both;
  }

  .back-btn { color: var(--accent); }
  .authors-btn { color: var(--accent2); }

  .back-btn::before,
  .authors-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
  }

  .back-btn::before    { background: rgba(91, 140, 255, 0.06); }
  .authors-btn::before { background: rgba(0, 181, 168, 0.06); }

  .back-btn:hover {
    border-color: rgba(91, 140, 255, 0.4);
    box-shadow: 0 0 16px rgba(91, 140, 255, 0.12);
    transform: translateY(-2px);
  }

  .authors-btn:hover {
    border-color: rgba(0, 181, 168, 0.4);
    box-shadow: 0 0 16px rgba(0, 181, 168, 0.12);
    transform: translateY(-2px);
  }

  .back-btn:hover::before,
  .authors-btn:hover::before {
    opacity: 1;
  }

  .back-btn:hover svg    { transform: translateX(-3px); }
  .authors-btn:hover svg { transform: scale(1.1); }

  .back-btn:active,
  .authors-btn:active {
    transform: scale(0.97);
  }

}


.card {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 520px;
  animation: rise 0.6s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(24px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.card-label {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--accent);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--border), transparent);
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
  transition: border-color 0.3s;
}

.panel:focus-within {
  border-color: rgba(91, 140, 255, 0.2);
}

h1 {
  font-size: 1.75rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 6px;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

h1 span {
  color: var(--accent);
}

.subtitle {
  font-size: 0.82rem;
  color: var(--muted);
  margin-bottom: 28px;
  letter-spacing: 0.02em;
}

.input-row {
  display: flex;
  gap: 8px;
}

.input-wrap {
  flex: 1;
  position: relative;
}

.input-prefix {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--muted);
  pointer-events: none;
  user-select: none;
}

input {
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px 12px 44px;
  font-size: 0.9rem;
  font-family: var(--mono);
  color: var(--text);
  outline: none;
  transition: border-color 0.2s, background 0.2s;
}

input::placeholder {
  color: var(--muted);
}

input:focus {
  border-color: rgba(91, 140, 255, 0.4);
  background: rgba(91, 140, 255, 0.04);
}

button {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 12px 22px;
  font-size: 0.88rem;
  font-weight: 600;
  font-family: 'Sora', sans-serif;
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s, opacity 0.2s;
  white-space: nowrap;
}

button:hover {
  background: #4a7af0;
}

button:active {
  transform: scale(0.97);
}

button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.result {
  margin-top: 16px;
  border-radius: 12px;
  padding: 20px;
  background: var(--success-bg);
  border: 1px solid rgba(61, 255, 208, 0.15);
}

.result-label {
  font-family: var(--mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent2);
  opacity: 0.6;
  margin-bottom: 6px;
}

.result-ip {
  font-family: var(--mono);
  font-size: 1.5rem;
  font-weight: 500;
  color: #fff;
  letter-spacing: 0.04em;
}

.error {
  margin-top: 16px;
  border-radius: 12px;
  padding: 16px 20px;
  background: var(--danger-bg);
  border: 1px solid rgba(255, 107, 107, 0.15);
  font-size: 0.88rem;
  color: #ff9090;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.error::before {
  content: '!';
  font-family: var(--mono);
  font-weight: 600;
  font-size: 0.75rem;
  background: rgba(255, 107, 107, 0.2);
  color: var(--danger);
  border-radius: 50%;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 1px;
}

.hidden {
  display: none;
}

@media (max-width: 600px) {
  nav {
    padding: 0 10px;
  }

  .nav-links {
    gap: 4px;
  }

  .panel {
    padding: 24px 20px;
  }

  h1 {
    font-size: 1.6rem;
  }

  .input-row {
    flex-direction: column;
  }

  button {
    width: 100%;
    padding: 12px;
  }
}


/* Footer */
footer {
  width: 100%;
  margin-top: 80px;
  padding-top: 28px;
  border-top: 1px solid var(--border);

  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 14px;
}

.footer-info {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.footer-name {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--text);
}

.footer-social {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 16px;
  font-family: 'DM Mono', monospace;
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  border-radius: 2px;
  border: 1px solid var(--border);
  background: transparent;
  transition: border-color 0.25s, box-shadow 0.25s, transform 0.25s, background 0.25s;
  position: relative;
  overflow: hidden;
}

.footer-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}

.footer-btn--github {
  color: var(--accent);
}

.footer-btn--github::before {
  background: rgba(91, 140, 255, 0.06);
}

.footer-btn--github:hover {
  border-color: rgba(91, 140, 255, 0.4);
  box-shadow: 0 0 16px rgba(91, 140, 255, 0.12);
  transform: translateY(-2px);
}

.footer-btn--github:hover::before {
  opacity: 1;
}

.footer-btn--linkedin {
  color: var(--accent2);
}

.footer-btn--linkedin::before {
  background: rgba(61, 255, 208, 0.06);
}

.footer-btn--linkedin:hover {
  border-color: rgba(61, 255, 208, 0.4);
  box-shadow: 0 0 16px rgba(61, 255, 208, 0.12);
  transform: translateY(-2px);
}

.footer-btn--linkedin:hover::before {
  opacity: 1;
}

.lang-switcher {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: 8px;
  padding-left: 12px;
  border-left: 1px solid var(--border);
}

nav .lang-btn {
  background: transparent;
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 4px 8px;
  font-size: 0.7rem;
  font-family: var(--mono);
  color: var(--muted);
  cursor: pointer;
  letter-spacing: 0.05em;
  font-weight: 500;
  transition: all 0.2s;
  white-space: nowrap;
}

nav .lang-btn:hover {
  color: var(--text);
  border-color: var(--border);
  background: var(--surface2);
  transform: none;
}

nav .lang-btn:active {
  transform: none;
}

nav .lang-btn.active {
  color: var(--accent);
  border-color: rgba(91, 140, 255, 0.3);
  background: var(--accent-glow);
}

.lang-sep {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.7rem;
  opacity: 0.4;
  user-select: none;
}