/* =========================================================
   Chordix tools Index
   ========================================================= */

@font-face {
  font-family: "Aldrich";
  src: url("fonts/Aldrich.ttf") format("truetype");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

:root {
  --bg: #000000;
  --ink: #d3def0;
  --ink-dim: rgba(211, 222, 240, 0.68);
  --ink-faint: rgba(211, 222, 240, 0.42);
  --line: rgba(211, 222, 240, 0.14);
  --line-soft: rgba(211, 222, 240, 0.08);
  --card: #08090b;
  --card-2: #0b0c0f;
  --accent: #7fe6dc;
  --font-en: "Aldrich", "Saira", "Bahnschrift", "Segoe UI", sans-serif;
  --font-zh: "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
  --font: var(--font-en), var(--font-zh);
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ---------- background ---------- */

.bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.bg__glow {
  position: absolute;
  top: -32vh;
  left: 50%;
  width: 120vw;
  height: 90vh;
  transform: translateX(-50%);
  background: radial-gradient(
    50% 50% at 50% 50%,
    rgba(127, 230, 220, 0.07) 0%,
    rgba(127, 230, 220, 0.02) 40%,
    transparent 72%
  );
}

.bg__grid {
  position: absolute;
  inset: 0;
  opacity: 0.5;
  background-image:
    linear-gradient(to right, rgba(211, 222, 240, 0.035) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(211, 222, 240, 0.035) 1px, transparent 1px);
  background-size: 96px 96px;
  mask-image: radial-gradient(75% 60% at 50% 0%, #000 0%, transparent 78%);
  -webkit-mask-image: radial-gradient(75% 60% at 50% 0%, #000 0%, transparent 78%);
}

/* ---------- layout ---------- */

.page {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: clamp(48px, 9vh, 104px) clamp(20px, 4vw, 40px) 120px;
}

/* ---------- masthead ---------- */

.masthead {
  margin-bottom: clamp(32px, 5vh, 56px);
}

.masthead__eyebrow {
  margin: 0 0 18px;
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: 0.42em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.masthead__title {
  margin: 0;
  font-family: var(--font-en);
  font-weight: 400;
  font-size: clamp(38px, 6.4vw, 76px);
  line-height: 1.02;
  letter-spacing: 0.005em;
  color: var(--ink);
}

.masthead__sub {
  margin: 20px 0 0;
  font-family: var(--font-zh);
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--ink-dim);
}

/* ---------- grid ---------- */

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
}

/* ---------- card ---------- */

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 232px;
  padding: 22px 22px 20px;
  border: 1px solid var(--line-soft);
  border-radius: 14px;
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(211, 222, 240, 0.045), transparent 55%),
    linear-gradient(160deg, var(--card-2), var(--card));
  color: inherit;
  text-decoration: none;
  overflow: hidden;
  isolation: isolate;
  transition: border-color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
}

.card::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: radial-gradient(70% 55% at 50% 0%, rgba(127, 230, 220, 0.09), transparent 68%);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.card:hover,
.card:focus-visible {
  transform: translateY(-3px);
  border-color: rgba(211, 222, 240, 0.26);
  box-shadow: 0 18px 44px -22px rgba(0, 0, 0, 0.9), 0 0 0 1px rgba(211, 222, 240, 0.03);
  outline: none;
}

.card:hover::after,
.card:focus-visible::after { opacity: 1; }

.card__top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 30px;
}

.card__icon {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--ink);
  background: rgba(211, 222, 240, 0.02);
  transition: border-color 0.25s ease, color 0.25s ease;
}

.card__icon svg { width: 19px; height: 19px; }

.card:hover .card__icon {
  border-color: rgba(127, 230, 220, 0.5);
  color: var(--accent);
}

.card__arrow {
  color: var(--ink-faint);
  transition: color 0.25s ease, transform 0.25s ease;
}

.card__arrow svg { width: 17px; height: 17px; }

.card:hover .card__arrow {
  color: var(--ink);
  transform: translate(1px, -1px);
}

.card__title {
  margin: 0 0 10px;
  font-family: var(--font-en), var(--font-zh);
  font-weight: 400;
  font-size: 19px;
  line-height: 1.35;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.card__title span {
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-left: 6px;
  white-space: nowrap;
}

.card__desc {
  margin: 0;
  font-family: var(--font-zh);
  font-size: 13px;
  line-height: 1.85;
  letter-spacing: 0.03em;
  color: var(--ink-dim);
}

.card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: auto 0 0;
  padding: 22px 0 0;
  list-style: none;
}

.card__tags li {
  padding: 4px 10px;
  border: 1px solid var(--line-soft);
  border-radius: 6px;
  font-family: var(--font-en), var(--font-zh);
  font-size: 10.5px;
  line-height: 1.5;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
  white-space: nowrap;
  transition: color 0.25s ease, border-color 0.25s ease;
}

.card:hover .card__tags li {
  color: var(--ink-dim);
  border-color: var(--line);
}

/* ---------- outro ---------- */

.outro {
  margin: 34px 2px 0;
  font-family: var(--font-zh);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ink-faint);
}

/* ---------- version ---------- */

.version {
  position: fixed;
  right: clamp(14px, 2.2vw, 26px);
  bottom: clamp(14px, 2.2vw, 26px);
  z-index: 5;
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.72);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--ink-dim);
  user-select: none;
}

/* ---------- scrollbar ---------- */

::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: #000; }
::-webkit-scrollbar-thumb {
  background: rgba(211, 222, 240, 0.14);
  border: 2px solid #000;
  border-radius: 99px;
}
::-webkit-scrollbar-thumb:hover { background: rgba(211, 222, 240, 0.26); }

/* ---------- responsive ---------- */

@media (max-width: 560px) {
  .page { padding-bottom: 96px; }
  .card { min-height: 210px; padding: 20px; }
  .card__top { margin-bottom: 24px; }
  .version { font-size: 10px; padding: 6px 11px; }
}

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