:root {
  --bg: #0b0f14;
  --card: #0f141b;
  --text: #e6edf3;
  --muted: #aab8c5;
  --accent: #7aa2ff;
  --ring: #2b74ff55;
  --tile: #111824;
  --tile-hover: #0f1b2d;
  --form-title-color: #000000;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  --cert: #ffffff;
  --border: #000000;
  --card_p: #ffffff;
  --card_desc: #ddddde;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7f9fc;
    --card: #ffffff;
    --text: #0b1220;
    --muted: #4b5565;
    --accent: #335cff;
    --ring: #335cff33;
    --tile: #f3f6fb;
    --tile-hover: #e8eefb;
    --form-title-color: #ffffff;
    --shadow: 0 8px 24px rgba(2, 12, 27, 0.08);
    --cert: #000000;
    --border: #e5e7eb;
    --card_p: #2c2d2f;
    --card_desc: #5e5f75;
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: radial-gradient(1200px 700px at 10% -10%, #335cff22, transparent 60%),
    radial-gradient(900px 500px at 90% 10%, #09b6ff22, transparent 60%),
    linear-gradient(180deg, var(--bg), var(--bg));
  min-height: 100dvh;
}

.page {
  max-width: 880px;
  margin: 0 auto;
  padding: 32px 20px 48px;
}

.hero {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 22px;
}

.headings {
  flex-grow: 1;
}

.title {
  padding: 18px;
  margin: 0 0 12px 0;
  font-size: 35px;
  letter-spacing: 0.2px;
}

.subtitle {
  margin: 2px 0 0 0;
  color: var(--muted);
  font-size: 18px;
}

#hackingNameSubtitle {
  display: inline-block;
  width: 100%;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.certifications {
  margin-top: 3rem;
  padding: 1rem 0;
}

.certifications h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 2rem;
  color: var(--cert);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.cert-card {
  background: var(--card);
  border: 2px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  text-align: center;
  transition: all 0.3s ease;
  cursor: pointer;
  text-decoration: none;
  display: block;
}

.cert-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
  border-color: var(--cert);
}

.cert-card img {
  width: 100%;
  height: 140px;
  object-fit: contain;
  margin-bottom: 0.75rem;
  border-radius: 8px;
}

.cert-card h4 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  margin: 0;
  line-height: 1.3;
}

.cert-card p {
  font-size: 0.75rem;
  color: var(--card_p);
  margin: 0.75rem 0 0 0;
}

.cert-card .desc {
  margin-top: 0.75rem;
  font-size: 0.7rem;
  color: var(--card_desc);
  font-style: italic;
}

.links-section {
  margin-top: 20px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.tile {
  position: relative;
  border-radius: 18px;
  background: linear-gradient(180deg, var(--tile), var(--card));
  padding: 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  color: var(--text);
  transform: translateY(0);
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.25s ease;
  box-shadow: var(--shadow);
  outline: none;
}

.tile:hover,
.tile:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.25);
  background: linear-gradient(180deg, var(--tile-hover), var(--card));
}

.tile:focus-visible {
  box-shadow: 0 0 0 6px var(--ring), var(--shadow);
}

.icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  background: #0c1220;
  color: white;
  font-size: 18px;
  flex: 0 0 auto;
}

.tile .icon img {
  border-radius: 6px;
  width: 20px;
  height: 20px;
}

.tile .meta {
  display: grid;
  gap: 2px;
}

.tile .label {
  font-weight: 600;
}

.tile .subtitle {
  font-size: 12px;
  line-height: 1.2;
  margin-top: 4px;
  color: var(--muted);
  font-style: italic;
}

.about {
  margin-top: 28px;
  background: var(--card);
  border-radius: 20px;
  padding: 20px;
  box-shadow: var(--shadow);
}

.about h2 {
  margin: 0 0 8px 0;
  font-size: 20px;
}

.about-text {
  margin: 0;
  line-height: 1.6;
  color: var(--text);
}

.cv {
  margin-top: 32px;
  border-radius: 16px;
  background: linear-gradient(180deg, var(--tile), var(--card));
  padding: 14px 16px;
  line-height: 1.4;
}

.cv summary {
  cursor: pointer;
  font-weight: 600;
  outline: none;
}

.cv summary:focus-visible {
  box-shadow: 0 0 0 6px var(--ring);
  border-radius: 10px;
}

.cv-grid {
  margin-top: 12px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.cv-grid .full {
  grid-column: 1 / -1;
}

.cv-section h3 {
  margin-bottom: 10px;
}

.cv ul {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding-left: 20px;
  margin: 0;
}

.cv ul li {
  margin-bottom: 7px;
}

.contact-form-section {
  padding-top: 20px;
}

form {
  width: 100%;
  max-width: 640px;
  margin: 40px auto;
  text-align: left;
  background: var(--card);
  border-radius: 16px;
  padding: 2rem 2.2rem;
  box-shadow: var(--shadow);
  transition: box-shadow 0.3s ease, transform 0.3s ease;
}

form:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.25);
}

form label {
  display: block;
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
  margin-bottom: 6px;
  letter-spacing: 0.3px;
}

form input,
form textarea {
  width: 100%;
  margin-bottom: 18px;
  padding: 12px 16px;
  border-radius: 10px;
  border: 2px solid transparent;
  font-size: 1rem;
  background: var(--tile);
  color: var(--text);
  font-family: 'Inter', system-ui, sans-serif;
  transition: border-color 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
}

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

form input:focus,
form textarea:focus {
  border-color: var(--accent);
  outline: none;
  background: var(--tile-hover);
  box-shadow: 0 0 0 4px var(--ring);
}

form textarea {
  min-height: 120px;
  resize: vertical;
  line-height: 1.5;
}

form button[type='submit'] {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  padding: 12px 28px;
  border-radius: 12px;
  border: none;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.25s ease, background 0.3s ease;
  font-size: 1rem;
  letter-spacing: 0.4px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

form button[type='submit']:hover,
form button[type='submit']:focus-visible {
  background: #5a7bff;
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2);
  outline: none;
}

.form-title {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  text-align: center;
  color: var(--text);
}

.footer {
  text-align: center;
  color: var(--muted);
  margin-top: 28px;
  font-size: 0.85rem;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 1100px) {
  .page {
    padding: 28px 18px 40px;
  }

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

  #hackingNameSubtitle {
    display: block;
    white-space: normal;
    overflow: visible;
    text-overflow: unset;
  }

}

@media (max-width: 800px) {
  .hero {
    flex-direction: column;
    align-items: center;
    gap: 12px;
  }

  .title {
    font-size: 24px;
    text-align: center;
    padding: 10px;
  }

  .subtitle {
    font-size: 14px;
    text-align: center;
  }

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

  .tile {
    padding: 14px;
  }

  .tile .icon {
    width: 32px;
    height: 32px;
  }

  .tile .icon img {
    width: 18px;
    height: 18px;
  }

  .tile .label {
    font-size: 1rem;
  }

  .tile .subtitle {
    font-size: 11px;
  }

  .about {
    padding: 15px;
  }

  .about h2 {
    font-size: 18px;
  }

  .about-text {
    font-size: 0.95rem;
  }

  .cv {
    padding: 12px 14px;
  }

  .cv summary {
    font-size: 0.95rem;
  }

  .cv-section h3 {
    font-size: 1rem;
  }

  form {
    padding: 1.5rem 1rem;
  }

  form label {
    font-size: 0.9rem;
  }

  form input,
  form textarea {
    font-size: 0.95rem;
    padding: 10px 12px;
    margin-bottom: 15px;
  }

  form textarea {
    min-height: 100px;
  }

  form button[type='submit'] {
    font-size: 0.95rem;
    padding: 10px 20px;
  }

  .footer {
    font-size: 0.8rem;
  }
}

@media (max-width: 480px) {
  .cert-grid {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .page {
    padding: 20px 15px 30px;
  }

  .title {
    font-size: 22px;
  }

  .subtitle {
    font-size: 13px;
  }

  .tile {
    padding: 12px;
  }

  .tile .icon {
    width: 28px;
    height: 28px;
  }

  .tile .icon img {
    width: 16px;
    height: 16px;
  }

  .tile .label {
    font-size: 0.95rem;
  }

  .tile .subtitle {
    font-size: 10px;
  }

  .about {
    padding: 12px;
  }

  .about h2 {
    font-size: 16px;
  }

  .about-text {
    font-size: 0.9rem;
  }

  .cv {
    padding: 10px 12px;
  }

  .cv summary {
    font-size: 0.9rem;
  }

  .cv-section h3 {
    font-size: 0.95rem;
  }

  form {
    padding: 1rem;
  }

  form input,
  form textarea {
    font-size: 0.85rem;
    padding: 8px 10px;
  }

  form button[type='submit'] {
    font-size: 0.9rem;
    padding: 8px 16px;
  }
}