/* MECH//KEYS summary stylesheet !!! */

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

/* Design Bits & Tokens */
:root {
  --bg:            #000000;
  --dot:           rgba(134, 154, 186, 0.55);
  --dark:          #2d2e3b;
  --darker:        #14141c;
  --light:         #869aba;
  --light-2:       #b8c4db;

  --text-strong:   #ffffff;
  --text-soft:     #b8c4db;
  --text-muted:    #869aba;

  --card-top:      rgba(45, 46, 59, 0.9);
  --card-bottom:   rgba(20, 20, 28, 0.9);
  --card-border:   rgba(134, 154, 186, 0.22);
  --card-hover:    rgba(134, 154, 186, 0.55);

  --rule:          rgba(134, 154, 186, 0.25);
  --tag-bg:        rgba(45, 46, 59, 0.55);

  --ambient-a:     rgba(134, 154, 186, 0.08);
  --ambient-b:     rgba(45, 46, 59, 0.45);

  --radius:        4px;
  --ease:          cubic-bezier(.2,.7,.2,1);
  --mono:          "Share Tech Mono", monospace;
}

/* Base Canvas */
html, body {
  width: 100%;
  min-height: 100%;
  font-family: var(--mono);
  font-weight: 400;
  color: var(--text-soft);
  background-color: var(--bg);
  line-height: 1.6;
  letter-spacing: 0.01em;
  overflow-x: hidden;
}

/* Dotted Grid */
body {
  background-image: radial-gradient(circle, var(--dot) 1px, transparent 1px);
  background-size: 22px 22px;
  background-attachment: fixed;
  position: relative;
}

/* Ambient Glow */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(60% 45% at 15% 10%, var(--ambient-a), transparent 70%),
    radial-gradient(50% 40% at 85% 90%, var(--ambient-b), transparent 70%);
  z-index: 0;
}

/* HEADER */
.doc-header {
  position: relative;
  z-index: 1;
  padding: clamp(72px, 10vw, 140px) clamp(24px, 6vw, 72px) clamp(56px, 7vw, 96px);
  border-bottom: 1px solid var(--rule);
}

.doc-header-inner {
  max-width: 1100px;
  margin: 0 auto;
}

/* Top Kicker */
.doc-kicker {
  display: inline-block;
  font-size: 0.78rem;
  letter-spacing: 0.3em;
  color: var(--light);
  padding: 5px 12px;
  border: 1px solid rgba(134,154,186,0.55);
  border-radius: 2px;
  background: var(--tag-bg);
  margin-bottom: 28px;
}

/* Big Title */
.doc-title {
  font-family: var(--mono);
  font-weight: 400;
  font-size: clamp(2.8rem, 9vw, 6rem);
  color: var(--text-strong);
  letter-spacing: 0.05em;
  line-height: 1.05;
  text-shadow: 0 0 30px var(--ambient-a);
  margin-bottom: 22px;
}
.doc-title .slash { color: var(--light); }

/* Subtitle Copy */
.doc-sub {
  font-family: var(--mono);
  color: var(--text-soft);
  font-size: clamp(1.05rem, 1.6vw, 1.35rem);
  max-width: 780px;
  margin-bottom: 44px;
}

/* Meta Row */
.doc-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 18px;
  padding-top: 28px;
  border-top: 1px solid var(--rule);
}
.doc-meta > div {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.meta-label {
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  color: var(--light);
}
.meta-value {
  font-size: 1rem;
  color: var(--text-strong);
  letter-spacing: 0.04em;
}

/*  MAIN CONTENT */
.doc-main {
  position: relative;
  z-index: 1;
  max-width: 1100px;
  margin: 0 auto;
  padding: clamp(48px, 6vw, 96px) clamp(24px, 6vw, 72px) clamp(72px, 8vw, 120px);
}

.doc-section {
  padding: clamp(40px, 5vw, 72px) 0;
  border-bottom: 1px solid var(--rule);
}
.doc-section:last-child { border-bottom: none; }

/* Section Tag */
.section-tag {
  display: inline-block;
  font-size: 0.78rem;
  letter-spacing: 0.25em;
  color: var(--light);
  padding: 5px 12px;
  border: 1px solid rgba(134,154,186,0.55);
  border-radius: 2px;
  background: var(--tag-bg);
  margin-bottom: 24px;
}

/* Section Heading */
.doc-section h2 {
  font-family: var(--mono);
  font-weight: 400;
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  color: var(--text-strong);
  line-height: 1.15;
  letter-spacing: 0.01em;
  max-width: 860px;
  margin-bottom: 14px;
}

/* Section Kicker */
.section-kicker {
  color: var(--light);
  font-size: clamp(0.95rem, 1.25vw, 1.1rem);
  letter-spacing: 0.02em;
  max-width: 760px;
  margin-bottom: 36px;
}

/* Prose Body */
.prose p {
  color: var(--text-soft);
  font-size: 1.02rem;
  max-width: 780px;
  margin-bottom: 18px;
}
.prose p:last-child { margin-bottom: 0; }

/*  CALLOUT */
.callout {
  margin-top: 32px;
  position: relative;
  background: linear-gradient(180deg, var(--card-top) 0%, var(--card-bottom) 100%);
  border: 1px solid var(--card-border);
  border-left: 3px solid var(--light);
  border-radius: var(--radius);
  padding: 22px 26px;
  max-width: 820px;
}
.callout-tag {
  display: inline-block;
  font-size: 0.7rem;
  letter-spacing: 0.28em;
  color: var(--light);
  margin-bottom: 10px;
}
.callout-text {
  color: var(--text-strong);
  font-size: 1rem;
  letter-spacing: 0.01em;
}

/*  TWO COLUMN CARDS  */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 12px;
}

/* Card Base */
.card {
  position: relative;
  background: linear-gradient(180deg, var(--card-top) 0%, var(--card-bottom) 100%);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color 0.25s, transform 0.25s;
}
.card:hover {
  border-color: var(--card-hover);
  transform: translateY(-2px);
}

/* Card Tag */
.card-label {
  display: inline-block;
  font-size: 0.72rem;
  letter-spacing: 0.28em;
  color: var(--light);
  padding: 3px 10px;
  border: 1px solid rgba(134,154,186,0.55);
  border-radius: 2px;
  background: var(--tag-bg);
  margin-bottom: 14px;
}

/* Card Number */
.card-num {
  display: inline-block;
  font-size: 0.8rem;
  letter-spacing: 0.22em;
  color: var(--light);
  margin-bottom: 12px;
}

/* Card Heading */
.card-title,
.card h3,
.card h4 {
  font-family: var(--mono);
  font-weight: 400;
  font-size: 1.2rem;
  color: var(--text-strong);
  letter-spacing: 0.02em;
  margin-bottom: 14px;
}

.card p {
  color: var(--text-soft);
  font-size: 0.98rem;
}

/* Card List */
.card ul { list-style: none; padding: 0; }
.card ul li {
  padding: 9px 0 9px 22px;
  border-bottom: 1px solid var(--rule);
  color: var(--text-soft);
  font-size: 0.98rem;
  position: relative;
  letter-spacing: 0.01em;
}
.card ul li::before {
  content: "\203A";
  position: absolute;
  left: 2px;
  color: var(--light);
}
.card ul li:last-child { border-bottom: none; }

/* Accent Edges */
.card-familiar  { border-top: 2px solid var(--light); }
.card-new       { border-top: 2px solid var(--text-strong); }
.card-challenge { border-top: 2px solid rgba(230, 163, 163, 0.7); }
.card-win       { border-top: 2px solid rgba(134, 200, 160, 0.7); }

/* TIMELINE  */
.timeline {
  position: relative;
  margin: 16px 0 0 14px;
  padding-left: 30px;
  border-left: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.timeline-item {
  position: relative;
  background: linear-gradient(180deg, var(--card-top) 0%, var(--card-bottom) 100%);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 20px 24px;
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 22px;
  align-items: start;
  transition: border-color 0.25s;
}
.timeline-item:hover { border-color: var(--card-hover); }
.timeline-item::before {
  content: "";
  position: absolute;
  left: -37px;
  top: 28px;
  width: 10px;
  height: 10px;
  background: var(--light);
  border-radius: 50%;
  box-shadow: 0 0 0 4px var(--ambient-a);
}
.timeline-year {
  color: var(--light);
  font-size: 0.9rem;
  letter-spacing: 0.2em;
  padding-top: 2px;
  white-space: nowrap;
}
.timeline-body h4 {
  font-family: var(--mono);
  font-weight: 400;
  font-size: 1.1rem;
  color: var(--text-strong);
  letter-spacing: 0.02em;
  margin-bottom: 6px;
}
.timeline-body p {
  color: var(--text-soft);
  font-size: 0.98rem;
}

/*  TOOLS GRID */
.parts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
  margin-top: 12px;
}
.small-card h4 {
  font-size: 1.1rem;
}
.small-card p { font-size: 0.95rem; }

/* FOOTER */
.doc-footer {
  margin-top: 48px;
  text-align: center;
  font-family: var(--mono);
  font-size: 0.82rem;
  letter-spacing: 0.22em;
  color: var(--light);
  opacity: 0.7;
}

/* RESPONSIVE */
@media (max-width: 820px) {
  .two-col { grid-template-columns: 1fr; }
  .timeline-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}

@media (max-width: 480px) {
  .doc-title { font-size: 2.6rem; letter-spacing: 0.04em; }
  .doc-sub { font-size: 1rem; }
  .doc-section h2 { font-size: 1.55rem; }
  .card { padding: 22px; }
  .timeline { padding-left: 22px; margin-left: 6px; }
  .timeline-item::before { left: -29px; }
}