/* ------------------------------------------------------------
   Minimalist Apple-like system styling
   - Light/Dark mode via prefers-color-scheme
   - Subtle elevation on hover, crisp borders
   - Accessible focus rings
   - Responsive grid
------------------------------------------------------------- */

:root {
  color-scheme: dark;
  --bg: #0e0f12;
  --fg: #f5f6f7;
  --muted: #a5a7ad;
  --card: #14161a;
  --border: #23262b;
  --link: #5aa3ff;
  --ring: #5aa3ff33;
  --radius: 12px;
  --shadow-1: 0 1px 2px rgba(0,0,0,0.6);
  --shadow-2: 0 12px 28px rgba(0,0,0,0.55);
  --space: clamp(12px, 2.2vw, 20px);
  --accent: #5aa3ff;        /* Blue (dark) */
  --accent-2: #b58bff;      /* Purple (dark) */
  --accent-soft: color-mix(in oklab, var(--accent) 18%, transparent);
  --accent-soft-2: color-mix(in oklab, var(--accent-2) 14%, transparent);
}

::selection { background: color-mix(in oklab, var(--link) 20%, transparent); }

*,
*::before,
*::after { box-sizing: border-box; }

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

:root {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display",
                "Segoe UI", Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.5;
  font-feature-settings: "calt","liga","kern","ss01","ss02","tnum";
  font-variant-numeric: tabular-nums;
  font-synthesis-weight: none;
  font-synthesis-style: none;
  font-optical-sizing: auto;
  text-rendering: optimizeLegibility;
}

body {
  margin: 0;
  background:
    radial-gradient(1200px 600px at 10% -10%, var(--accent-soft), transparent 60%),
    radial-gradient(1000px 500px at 110% 0%, var(--accent-soft-2), transparent 60%),
    var(--bg);
  color: var(--fg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  letter-spacing: 0;
}

.wrap {
  max-width: 840px;
  margin: calc(var(--space) * 2) auto;
  padding: 0 calc(var(--space) * 0.8);
}

header.site {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space);
  margin-bottom: calc(var(--space) * 1.2);
}

h1 {
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.01em;
  font-size: clamp(20px, 3.4vw, 28px);
  line-height: 1.18;
  text-wrap: balance;
}

.subtle {
  color: var(--muted);
  font-size: 13px;
}

.feed { display: block; }

.day-group { margin-bottom: calc(var(--space) * 1.2); }
.day-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: calc(var(--space) * 0.8);
}

.card {
  background:
    linear-gradient(var(--card), var(--card)) padding-box,
    linear-gradient(180deg, color-mix(in oklab, var(--border) 90%, var(--accent-soft)) 0%, transparent 100%) border-box;
  border: 1px solid transparent; /* gradient border */
  border-radius: var(--radius);
  padding: calc(var(--space) * 0.9);
  box-shadow: var(--shadow-1);
  transition: box-shadow 160ms ease, transform 160ms ease, border-color 160ms ease, background 220ms ease;
  will-change: transform;
}

/* Subtle card reveal animation (HIG-friendly) */
@keyframes card-reveal {
  from {
    opacity: 0;
    transform: translateY(4px) scale(0.998);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.card {
  opacity: 0; /* start hidden for animation */
  animation-name: card-reveal;
  animation-duration: 220ms;
  animation-timing-function: ease-out;
  animation-fill-mode: both; /* keep final state */
  animation-delay: calc(var(--stagger, 0) * 40ms); /* staggerable via CSS var */
}

.card:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-2), 0 0 0 1px color-mix(in oklab, var(--accent) 20%, transparent);
  background:
    linear-gradient(var(--card), var(--card)) padding-box,
    linear-gradient(180deg, color-mix(in oklab, var(--border) 70%, var(--accent-soft)) 0%, color-mix(in oklab, transparent 80%, var(--accent-soft)) 100%) border-box;
}

.card h2 {
  margin: 0 0 8px;
  font-weight: 600;
  letter-spacing: -0.012em;
  font-size: clamp(16px, 2.6vw, 20px);
  line-height: 1.22;
  text-wrap: balance;
}

.meta {
  font-size: 13px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.01em;
}

.meta a {
  color: var(--link);
  text-decoration: none;
  text-underline-offset: 2px;
  text-decoration-thickness: from-font;
}

.meta a:hover { text-decoration: underline; color: var(--accent); }

.time {
  color: var(--muted);
  font-size: 12px;
  margin-top: calc(var(--space) * 0.8);
}

/* Focus styles for keyboard users */
:where(a, button, [role="button"]) {
  outline: none;
}

:where(a, button, [role="button"]):focus-visible {
  box-shadow: 0 0 0 3px var(--ring);
  border-radius: 8px;
}

/* Reduce motion preference */
@media (prefers-reduced-motion: reduce) {
  .card { transition: none; }
  .card:hover { transform: none; }
  .card { animation: none; opacity: 1; box-shadow: var(--shadow-1); }
}

.day-divider {
  position: relative;
  font-size: 12.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin: calc(var(--space) * 1.4) 0 calc(var(--space) * 0.8);
  padding-top: calc(var(--space) * 0.7);
}
.day-divider::before {
  content: "";
  position: absolute;
  left: 0; right: 0; top: 0;
  height: 1px;
  background: linear-gradient(90deg,
    transparent 0%,
    color-mix(in oklab, var(--accent) 35%, transparent) 20%,
    color-mix(in oklab, var(--accent-2) 35%, transparent) 80%,
    transparent 100%);
}

@media (min-width: 980px) {
  h1 { font-size: 30px; }
  .card h2 { font-size: 21px; }
  .meta { font-size: 13.5px; }
}