/* ==========================================================================
   RobotEvolve — shared stylesheet
   ========================================================================== */

:root {
  --bg-0: #05070f;
  --bg-1: #090d1a;
  --bg-2: #131a36;
  --ink: #e6edf7;
  --ink-dim: #93a1b8;
  --accent: #22d3ee;
  --accent-2: #8b5cf6;
  --accent-3: #e879f9;
  --glow: rgba(34, 211, 238, 0.35);
  --glow-2: rgba(139, 92, 246, 0.35);
  --panel: #0b1226;
  --panel-glass: rgba(17, 24, 45, 0.82);
  --line: rgba(94, 234, 212, 0.18);
  --chip: rgba(34, 211, 238, 0.08);
  --radius: 14px;
  --mono: "SF Mono", "Cascadia Code", "Fira Code", ui-monospace, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.55;
  background: linear-gradient(180deg, var(--bg-0) 0%, var(--bg-1) 48%, var(--bg-2) 100%) fixed;
}

[hidden] { display: none !important; }

/* --- Starfield (two fixed layers of tiny radial dots) ------------------- */

body::before,
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}

body::before {
  background-image:
    radial-gradient(1px 1px at 22px 34px, rgba(255,255,255,.9) 50%, transparent 51%),
    radial-gradient(1px 1px at 118px 92px, rgba(255,255,255,.55) 50%, transparent 51%),
    radial-gradient(1px 1px at 210px 21px, rgba(255,255,255,.7) 50%, transparent 51%),
    radial-gradient(1px 1px at 66px 158px, rgba(255,255,255,.45) 50%, transparent 51%),
    radial-gradient(1px 1px at 173px 187px, rgba(255,255,255,.6) 50%, transparent 51%),
    radial-gradient(1px 1px at 249px 130px, rgba(255,255,255,.5) 50%, transparent 51%);
  background-size: 280px 230px;
}

body::after {
  background-image:
    radial-gradient(1.6px 1.6px at 88px 51px, rgba(139,92,246,.85) 50%, transparent 51%),
    radial-gradient(1.6px 1.6px at 301px 200px, rgba(34,211,238,.8) 50%, transparent 51%),
    radial-gradient(1.4px 1.4px at 200px 310px, rgba(255,255,255,.75) 50%, transparent 51%);
  background-size: 420px 380px;
}

@media (prefers-reduced-motion: no-preference) {
  body::after { animation: twinkle 7s ease-in-out infinite alternate; }
  @keyframes twinkle {
    from { opacity: 0.45; }
    to   { opacity: 1; }
  }
}

/* --- Header -------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 28px;
  padding: 16px clamp(16px, 4vw, 44px);
  border-bottom: 1px solid var(--line);
  background: rgba(4, 6, 15, 0.55);
  backdrop-filter: blur(5px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 16px;
  color: inherit;
  text-decoration: none;
  min-width: 0;
}

.brand-logo { color: var(--accent); flex: none; }
.brand-logo .logo-glow { filter: drop-shadow(0 0 24px var(--glow)); }

.brand-name {
  display: block;
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.2;
}

.brand-name b { color: var(--accent); font-weight: 700; }

.tagline {
  display: block;
  font-size: 0.78rem;
  color: var(--ink-dim);
  letter-spacing: 0.06em;
}

.site-nav { display: flex; gap: 6px; flex-wrap: wrap; }

.nav-toggle {
  display: none;
  padding: 8px 6px;
  background: none;
  border: 0;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  margin: 5px 0;
  background: var(--accent);
  transition: transform 0.25s, opacity 0.25s;
}

.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Below 880px the brand + inline nav no longer fit on one row (the nav would
   wrap to a second line), so the nav collapses behind the toggle instead. */
@media (max-width: 880px) {
  .nav-toggle { display: block; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    gap: 0;
    padding: 8px clamp(16px, 4vw, 44px) 14px;
    background: rgba(4, 6, 15, 0.96);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--line);
  }

  .site-nav.open { display: flex; }

  .site-nav a {
    padding: 13px 4px;
    border-radius: 0;
    border-bottom: 1px solid rgba(148, 163, 184, 0.08);
    font-size: 1rem;
  }

  .site-nav a:last-child { border-bottom: 0; }
}

/* Phone: also drop the march-of-progress logo, keep just the wordmark */
@media (max-width: 720px) {
  .brand-logo { display: none; }
}

.site-nav a {
  color: var(--ink-dim);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}

.site-nav a:hover { color: var(--ink); }

.site-nav a.active {
  color: var(--accent);
  border-color: var(--line);
  background: var(--chip);
}

/* --- Page framing --------------------------------------------------------- */

main { padding: 0 clamp(16px, 4vw, 44px) 64px; max-width: 1180px; margin: 0 auto; }

.status {
  margin: 40px auto;
  max-width: 480px;
  padding: 18px 22px;
  text-align: center;
  color: var(--ink-dim);
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  background: var(--panel-glass);
}

.site-footer {
  padding: 22px clamp(16px, 4vw, 44px) 34px;
  border-top: 1px solid var(--line);
  color: var(--ink-dim);
  font-size: 0.8rem;
  text-align: center;
}

.site-footer a { color: var(--accent); text-decoration: none; }

/* --- Front page: the floating sky ----------------------------------------- */

.sky {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: stretch;   /* cards in a row share a height, so titles line up */
  gap: 22px 20px;
  margin-top: 12px;
}

/* Card: category + date line, title box, organization underneath.
   --tone is the per-category accent (cyan = tech, magenta = news). */
.sky-card {
  --tone: var(--accent);
  --tone-soft: rgba(34, 211, 238, 0.12);
  --tone-glow: rgba(34, 211, 238, 0.3);
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 5px;
  width: 184px;
  cursor: pointer;
  border: 0;
  padding: 0;
  background: none;
  color: inherit;
  font: inherit;
  text-align: left;
  transition: filter 0.25s;
}

.sky-card.cat-news {
  --tone: var(--accent-3);
  --tone-soft: rgba(232, 121, 249, 0.12);
  --tone-glow: rgba(232, 121, 249, 0.3);
}

.sky-card:hover,
.sky-card:focus-visible {
  outline: none;
  filter: drop-shadow(0 6px 18px var(--tone-glow));
}

/* One line above the title: category left, date right. */
.sky-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 0 1px;
}

.cat-pill {
  flex: none;
  padding: 2px 8px;
  border: 1px solid var(--tone);
  border-radius: 999px;
  background: var(--tone-soft);
  color: var(--tone);
  font-size: 0.55rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  line-height: 1.5;
  text-transform: uppercase;
}

.cat-pill.cat-tech {
  --tone: var(--accent);
  --tone-soft: rgba(34, 211, 238, 0.12);
}

.cat-pill.cat-news {
  --tone: var(--accent-3);
  --tone-soft: rgba(232, 121, 249, 0.12);
}

.sky-date {
  flex: none;
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--ink-dim);
  white-space: nowrap;
}

.sky-label {
  display: flex;
  flex: 1;                /* fills the row height; short titles sit centered */
  align-items: center;
  padding: 9px 11px;
  background: linear-gradient(180deg, rgba(19, 27, 51, 0.9), rgba(11, 18, 38, 0.78));
  border: 1px solid var(--line);
  border-left: 2px solid var(--tone);
  border-radius: 10px;
  font-size: 0.74rem;
  font-weight: 600;
  line-height: 1.35;
  transition: border-color 0.25s, background 0.25s;
}

.sky-card:hover .sky-label,
.sky-card:focus-visible .sky-label {
  border-color: var(--tone);
  background: linear-gradient(180deg, rgba(26, 36, 66, 0.95), rgba(14, 22, 46, 0.85));
}

.sky-org {
  overflow: hidden;
  padding: 0 2px;
  color: var(--ink-dim);
  font-size: 0.64rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: color 0.25s;
}

.sky-card:hover .sky-org,
.sky-card:focus-visible .sky-org { color: var(--tone); }

@media (prefers-reduced-motion: no-preference) {
  .sky-card {
    animation: bob var(--bob-dur, 8s) ease-in-out var(--bob-delay, 0s) infinite;
  }
  @keyframes bob {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(-5px); }
  }
}

@media (max-width: 640px) {
  .sky { gap: 12px 14px; }
  .sky-card { width: 150px; }
  .cat-pill { font-size: 0.5rem; padding: 2px 6px; letter-spacing: 0.1em; }
  .sky-date { font-size: 0.56rem; }
  .sky-label { padding: 8px 9px; font-size: 0.68rem; }
  .sky-org { font-size: 0.6rem; }
}

/* --- Chips (tags) ---------------------------------------------------------- */

.chip-row { display: flex; flex-wrap: wrap; gap: 6px; }

.chip {
  padding: 3px 10px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--accent-2);
  background: var(--chip);
  border: 1px solid var(--line);
  border-radius: 999px;
  white-space: nowrap;
}

/* --- Detail overlay ---------------------------------------------------------- */

body.modal-open { overflow: hidden; }

.detail-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: clamp(10px, 4vh, 48px) 14px;
  background: rgba(2, 4, 12, 0.72);
  backdrop-filter: blur(3px);
  overflow-y: auto;
}

.detail-panel {
  position: relative;
  width: min(680px, 100%);
  margin-bottom: 40px;
  padding: 28px clamp(18px, 4vw, 34px) 30px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.6);
}

.detail-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 38px;
  height: 38px;
  font-size: 1.3rem;
  line-height: 1;
  color: var(--ink-dim);
  background: var(--chip);
  border: 1px solid var(--line);
  border-radius: 50%;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}

.detail-close:hover { color: var(--ink); border-color: var(--accent); }

.detail-kicker {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 4px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--ink-dim);
  text-transform: uppercase;
}

.detail-kicker .cat-pill { font-size: 0.6rem; }

.detail-panel h2 { margin: 0 0 14px; font-size: 1.45rem; line-height: 1.3; padding-right: 34px; }

.detail-panel h3 {
  margin: 22px 0 8px;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
}

.detail-panel p { margin: 0 0 10px; color: var(--ink); }

.link-row { display: flex; flex-wrap: wrap; gap: 10px; }

.link-btn {
  padding: 8px 18px;
  font-size: 0.84rem;
  font-weight: 700;
  color: #04121a;
  background: var(--accent);
  border-radius: 999px;
  text-decoration: none;
  transition: filter 0.15s;
}

.link-btn:hover { filter: brightness(1.15); }

.link-btn.ghost {
  color: var(--accent);
  background: transparent;
  border: 1px solid var(--accent);
}

.detail-loading { text-align: center; color: var(--ink-dim); padding: 30px 0; }

/* ==========================================================================
   Front page — single-scroll sections (weekly news, trend)
   ========================================================================== */

.gradient-text {
  background: linear-gradient(90deg, var(--accent), var(--accent-2) 55%, var(--accent-3));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.section { padding-top: 72px; }
.section-first { padding-top: 40px; }

.section-head { text-align: center; margin-bottom: 34px; }

.section-head h1,
.section-head h2 {
  margin: 0 0 10px;
  font-size: clamp(1.5rem, 3.6vw, 2.2rem);
  letter-spacing: 0.01em;
}

/* Scroll reveal (motion-safe only; JS adds .visible) */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(26px);
    transition: opacity 0.7s ease, transform 0.7s ease;
  }
  .reveal.visible { opacity: 1; transform: none; }
}

/* --- Evolution sketch: the march of progress, robot edition --------------- */

.evo-wrap { margin: 0 auto 20px; max-width: 720px; }
.evo-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; scrollbar-width: thin; }
#evoSvg { display: block; width: 100%; min-width: 540px; height: auto; }

.evo-ground { --d: 0s; }
.evo-g1 { --d: 0.3s; }
.evo-g2 { --d: 0.9s; }
.evo-g3 { --d: 1.5s; }
.evo-g4 { --d: 2.1s; }
.evo-g5 { --d: 2.7s; }

.evo-path {
  fill: none;
  stroke: var(--accent);
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.evo-ground .evo-path { stroke: rgba(148, 163, 184, 0.45); stroke-width: 1.5; }
.evo-g1 .evo-path { stroke: rgba(34, 211, 238, 0.55); }
.evo-g2 .evo-path { stroke: rgba(34, 211, 238, 0.68); }
.evo-g3 .evo-path { stroke: rgba(34, 211, 238, 0.8); }
.evo-g4 .evo-path { stroke: rgba(34, 211, 238, 0.9); }
.evo-g5 .evo-path { stroke: url(#evoGrad); }

.evo-dot { fill: var(--accent); }
.evo-line { fill: none; stroke: var(--accent-2); stroke-width: 1.5; stroke-linecap: round; }
.evo-glow { filter: drop-shadow(0 0 8px var(--glow)) drop-shadow(0 0 18px var(--glow-2)); }

.evo-label {
  font-family: var(--mono);
  /* svg-unit size: the sketch renders at ~0.6 scale, so this reads ~11px */
  font-size: 19px;
  letter-spacing: 0.12em;
  fill: var(--ink-dim);
}
.evo-label-now { fill: var(--accent-3); }

/* draw-in animation, only when motion is allowed */
@media (prefers-reduced-motion: no-preference) {
  .evo-path {
    stroke-dasharray: 1;
    stroke-dashoffset: 1;
    transition: stroke-dashoffset 0.9s ease var(--d, 0s);
  }
  .evo-wrap.visible .evo-path { stroke-dashoffset: 0; }

  .evo-dot { opacity: 0; transition: opacity 0.5s ease calc(var(--d, 0s) + 0.7s); }
  .evo-spark { opacity: 0; transition: opacity 0.6s ease calc(var(--d, 0s) + 0.9s); }
  .evo-label { opacity: 0; transition: opacity 0.6s ease calc(var(--d, 0s) + 0.6s); }
  .evo-wrap.visible .evo-dot,
  .evo-wrap.visible .evo-spark,
  .evo-wrap.visible .evo-label { opacity: 1; }
  .evo-wrap.visible .evo-spark { animation: sparkle 2.2s ease-in-out 3.8s infinite; }
  @keyframes sparkle {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.35; }
  }
}

.evo-caption {
  margin-top: 8px;
  text-align: center;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(147, 161, 184, 0.55);
}

/* --- Trend: hottest-topics bar chart ---------------------------------------- */

.topic-chart {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 860px;
  margin: 0 auto 56px;
}

.topic-row {
  display: block;
  width: 100%;
  padding: 10px 12px;
  background: none;
  border: 0;
  border-radius: 10px;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: background 0.15s;
}

.topic-row:hover,
.topic-row:focus-visible {
  background: rgba(34, 211, 238, 0.06);
  outline: none;
}

.topic-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 7px;
}

.topic-name { font-weight: 700; font-size: 0.92rem; letter-spacing: 0.02em; }

.topic-rep {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.78rem;
  color: var(--ink-dim);
}

/* Entry count for the topic. */
.topic-val {
  font-family: var(--mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
}

.topic-track {
  display: block;
  height: 10px;
  border-radius: 5px;
  background: rgba(148, 163, 184, 0.12);
  overflow: hidden;
}

.topic-fill {
  display: block;
  height: 100%;
  width: var(--w, 0%);
  border-radius: 0 5px 5px 0; /* rounded data-end, square baseline */
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 10px var(--glow);
}

@media (prefers-reduced-motion: no-preference) {
  .topic-fill { width: 0; transition: width 1.1s cubic-bezier(0.2, 0.8, 0.2, 1); }
  .topic-chart.visible .topic-fill { width: var(--w, 0%); }
}

.chart-tip {
  position: absolute;
  z-index: 5;
  max-width: 320px;
  padding: 10px 12px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  pointer-events: none;
  font-size: 0.76rem;
  line-height: 1.5;
}

.chart-tip .tip-title {
  display: block;
  margin-bottom: 5px;
  font-family: var(--mono);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--accent);
}

.chart-tip .tip-item {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  color: var(--ink-dim);
}

.chart-tip .tip-item b {
  font-family: var(--mono);
  color: var(--ink-dim);
  font-weight: 600;
}

.chart-tip .tip-more { display: block; margin-top: 3px; color: var(--ink-dim); opacity: 0.7; }