:root {
  --bg: #071116;
  --bg-soft: #0b171d;
  --surface: rgba(15, 29, 36, .76);
  --surface-solid: #0e1d24;
  --text: #f2f6f7;
  --muted: #8fa2aa;
  --line: rgba(152, 190, 204, .15);
  --cyan: #20d4e6;
  --blue: #4c8dff;
  --violet: #8a70ff;
  --shadow: 0 24px 80px rgba(0, 0, 0, .22);
  color-scheme: dark;
}

:root[data-theme="light"] {
  --bg: #f4f7f7;
  --bg-soft: #eaf0f1;
  --surface: rgba(255, 255, 255, .78);
  --surface-solid: #fff;
  --text: #0c2027;
  --muted: #5e7179;
  --line: rgba(22, 61, 74, .13);
  --cyan: #0099ad;
  --blue: #286dd7;
  --violet: #6952d8;
  --shadow: 0 24px 70px rgba(25, 65, 76, .1);
  color-scheme: light;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  color: var(--text);
  background: var(--bg);
  font-family: "DM Sans", sans-serif;
  line-height: 1.6;
  transition: background .35s, color .35s;
}
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }

.ambient {
  position: fixed;
  z-index: -1;
  border-radius: 50%;
  filter: blur(110px);
  opacity: .12;
  pointer-events: none;
}
.ambient-one { width: 520px; height: 520px; left: -250px; top: 5vh; background: var(--cyan); }
.ambient-two { width: 520px; height: 520px; right: -270px; top: 25vh; background: var(--violet); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  width: min(1280px, calc(100% - 40px));
  height: 78px;
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 84%, transparent);
  backdrop-filter: blur(18px);
}
.brand { display: flex; align-items: center; gap: 11px; white-space: nowrap; }
.brand > span {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  background: var(--surface);
  font: 600 10px "Manrope", sans-serif;
  letter-spacing: .1em;
}
.brand strong { font-size: 13px; font-weight: 600; }
.header-actions { display: flex; align-items: center; gap: 12px; }
.back-link { color: var(--muted); font-size: 12px; transition: color .2s; }
.back-link:hover { color: var(--cyan); }
.theme-toggle {
  position: relative;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--text);
  background: var(--surface);
  cursor: pointer;
}
.theme-toggle span { grid-area: 1 / 1; transition: .25s; }
.theme-toggle .sun { opacity: 0; transform: rotate(-30deg); }
[data-theme="light"] .theme-toggle .sun { opacity: 1; transform: none; }
[data-theme="light"] .theme-toggle .moon { opacity: 0; transform: rotate(30deg); }

.container { width: min(1180px, calc(100% - 48px)); margin-inline: auto; }
.catalogue-heading { padding: 92px 0 58px; }
.eyebrow, .filter-label {
  color: var(--cyan);
  font: 700 10px "Manrope", sans-serif;
  letter-spacing: .2em;
  text-transform: uppercase;
}
.eyebrow { margin: 0 0 18px; }
h1 {
  max-width: 780px;
  margin: 0;
  font: 700 clamp(44px, 7vw, 82px) / 1 "Manrope", sans-serif;
  letter-spacing: -.055em;
}
h1 span {
  color: transparent;
  background: linear-gradient(100deg, var(--cyan), var(--blue), var(--violet));
  background-clip: text;
  -webkit-background-clip: text;
}
.subtitle { max-width: 650px; margin: 26px 0 0; color: var(--muted); font-size: 15px; }

.catalogue-panel {
  padding: 28px;
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: var(--shadow);
}
.filter-label { display: block; margin-bottom: 10px; }
#certFilter {
  width: 100%;
  margin: 0 0 24px;
  padding: 13px 15px;
  border: 1px solid var(--line);
  border-radius: 2px;
  outline: none;
  color: var(--text);
  background: var(--bg-soft);
  font-size: 13px;
  transition: border-color .2s, box-shadow .2s;
}
#certFilter:focus { border-color: var(--cyan); box-shadow: 0 0 0 3px color-mix(in srgb, var(--cyan) 12%, transparent); }
#certFilter::placeholder { color: var(--muted); }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); }
table { width: 100%; min-width: 870px; border-collapse: collapse; background: var(--surface-solid); }
thead th {
  position: sticky;
  top: 0;
  z-index: 2;
  padding: 14px 16px;
  color: var(--cyan);
  background: var(--bg-soft);
  border-bottom: 1px solid var(--line);
  font: 700 9px "Manrope", sans-serif;
  letter-spacing: .14em;
  text-align: left;
  text-transform: uppercase;
}
tbody td { padding: 14px 16px; border-bottom: 1px solid var(--line); color: var(--muted); font-size: 12px; vertical-align: top; }
tbody tr { transition: background .2s; }
tbody tr:hover { background: color-mix(in srgb, var(--surface-solid) 90%, var(--cyan)); }
tbody tr:last-child td { border-bottom: 0; }
tbody a { color: var(--text); transition: color .2s; }
tbody a:hover { color: var(--cyan); }
.group { color: var(--text); font-weight: 600; }
.date { white-space: nowrap; }

footer {
  min-height: 110px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-size: 10px;
}
footer a { color: var(--text); }
footer a:hover { color: var(--cyan); }

@media (max-width: 620px) {
  .site-header { width: calc(100% - 28px); }
  .brand strong { display: none; }
  .back-link { font-size: 0; }
  .back-link::before { content: "Portfolio"; font-size: 11px; }
  .container { width: min(100% - 28px, 1180px); }
  .catalogue-heading { padding: 68px 0 42px; }
  h1 { font-size: clamp(42px, 14vw, 64px); }
  .catalogue-panel { padding: 14px; }
  footer { flex-direction: column; justify-content: center; align-items: flex-start; padding: 28px 0; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; }
}