/* ===================================================================
   Signal & Summit — a journal-style blog theme
   =================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,400;0,9..144,500;0,9..144,600;1,9..144,400&family=Inter:wght@400;500;600&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root {
  color-scheme: dark;

  --paper: #12171B;
  --paper-raised: #1A2127;
  --ink: #E4E8E2;
  --ink-soft: #AAB3AD;
  --ink-faint: #76817E;
  --accent: #8EA9CE;
  --accent-soft: #C6D4E8;
  --code-bg: #232C35;
  --rule: #2B343A;

  --font-display: 'Fraunces', serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  --max-width: 720px;
  --rail-width: 64px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

/* ---------- Site header (image banner) ---------- */

.site-header {
  position: relative;
  background-size: cover;
  background-position: center 62%;
  height: 240px;
  display: flex;
  align-items: flex-end;
}

.site-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(18, 23, 27, 0.55) 0%,
    rgba(18, 23, 27, 0.10) 40%,
    rgba(18, 23, 27, 0.55) 78%,
    rgba(18, 23, 27, 1) 100%
  );
}

.site-header-inner {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.site-title {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: #F2F3ED;
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.35);
}

.site-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
}

.site-logo {
  height: 34px;
  width: auto;
  display: block;
  filter: drop-shadow(0 1px 6px rgba(0, 0, 0, 0.35));
}

.site-brand:hover .site-title { color: var(--accent-soft); }

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: lowercase;
}

.site-nav a {
  text-decoration: none;
  color: #DEE1D8;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  text-shadow: 0 1px 6px rgba(0, 0, 0, 0.3);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--accent-soft);
  border-color: var(--accent-soft);
}

.site-nav-socials {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding-left: 1rem;
  border-left: 1px solid rgba(222, 225, 216, 0.35);
}

.site-nav-socials a {
  border-bottom: none;
  padding-bottom: 0;
  line-height: 0;
  filter: drop-shadow(0 1px 4px rgba(0, 0, 0, 0.3));
}

.site-nav-socials svg {
  display: block;
  width: 19px;
  height: 19px;
  fill: #DEE1D8;
  transition: fill 0.2s ease;
}

.site-nav-socials a:hover svg {
  fill: var(--accent-soft);
}

@media (max-width: 560px) {
  .site-header { height: 180px; }
  .site-logo { height: 26px; }
  .site-nav { gap: 1rem; }
  .site-nav-socials { gap: 0.7rem; padding-left: 0.75rem; }
  .site-nav-socials svg { width: 17px; height: 17px; }
}

/* ---------- Post list (index) ---------- */

.post-list {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem 1.5rem 4rem;
}

.intro {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.2rem;
  color: var(--ink-soft);
  max-width: 46ch;
  margin: 0 0 3rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--rule);
}

.entry {
  display: grid;
  grid-template-columns: var(--rail-width) 1fr;
  gap: 0;
  border-bottom: 1px solid var(--rule);
}

.entry:first-child { border-top: 1px solid var(--rule); }

.entry-date {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-faint);
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  text-align: right;
  padding: 1.75rem 0;
  white-space: nowrap;
  letter-spacing: 0.04em;
}

.entry-body {
  padding: 1.75rem 0 1.75rem 1.25rem;
  border-left: 1px solid var(--rule);
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.entry-thumb {
  flex-shrink: 0;
  width: 88px;
  height: 88px;
  object-fit: cover;
  border-radius: 3px;
  display: block;
}

.entry-text {
  min-width: 0;
  flex: 1;
}

.entry-title {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.entry-title a {
  text-decoration: none;
  background-image: linear-gradient(var(--accent), var(--accent));
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 0% 2px;
  transition: background-size 0.25s ease;
}

.entry-title a:hover {
  background-size: 100% 2px;
}

.entry-excerpt {
  margin: 0 0 0.75rem;
  color: var(--ink-soft);
  max-width: 60ch;
}

.entry-meta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-faint);
  text-transform: lowercase;
}

/* ---------- Single post ---------- */

.post {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem 5rem;
  display: grid;
  grid-template-columns: var(--rail-width) 1fr;
}

.post-rail {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-faint);
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  text-align: right;
  padding-top: 0.5rem;
  white-space: nowrap;
  letter-spacing: 0.04em;
}

.post-content {
  border-left: 1px solid var(--rule);
  padding-left: 1.25rem;
}

.post-gallery {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(2, 130px);
  gap: 6px;
  margin: 0.25rem 0 2rem;
}

.post-gallery img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  border-radius: 2px;
}

.post-gallery img:nth-child(1) { grid-column: 1 / 3; grid-row: 1 / 3; }
.post-gallery img:nth-child(2) { grid-column: 3 / 4; grid-row: 1 / 2; }
.post-gallery img:nth-child(3) { grid-column: 4 / 5; grid-row: 1 / 2; }
.post-gallery img:nth-child(4) { grid-column: 3 / 4; grid-row: 2 / 3; }
.post-gallery img:nth-child(5) { grid-column: 4 / 5; grid-row: 2 / 3; }

@media (max-width: 640px) {
  .post-gallery {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 190px 110px 110px;
    gap: 6px;
  }

  .post-gallery img:nth-child(1) { grid-column: 1 / 3; grid-row: 1 / 2; }
  .post-gallery img:nth-child(2) { grid-column: 1 / 2; grid-row: 2 / 3; }
  .post-gallery img:nth-child(3) { grid-column: 2 / 3; grid-row: 2 / 3; }
  .post-gallery img:nth-child(4) { grid-column: 1 / 2; grid-row: 3 / 4; }
  .post-gallery img:nth-child(5) { grid-column: 2 / 3; grid-row: 3 / 4; }
}

.post-content h1 {
  font-family: var(--font-display);
  font-size: 2.1rem;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0 0 1.5rem;
}

.post-content p { margin: 0 0 1.3rem; }

.post-content h2 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 500;
  margin: 2.5rem 0 1rem;
}

.post-content blockquote {
  margin: 1.75rem 0;
  padding-left: 1.25rem;
  border-left: 2px solid var(--accent);
  font-style: italic;
  color: var(--ink-soft);
}

.post-content code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--code-bg);
  color: var(--accent-soft);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

.back-link {
  display: inline-block;
  margin-top: 3rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-decoration: none;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--rule);
}

.back-link:hover { color: var(--accent); border-color: var(--accent); }

/* ---------- Footer ---------- */

.site-footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-faint);
  border-top: 1px solid var(--rule);
}

/* ---------- Focus states ---------- */

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ---------- Responsive ---------- */

@media (max-width: 560px) {
  :root { --rail-width: 40px; }
  .entry-date, .post-rail { font-size: 0.62rem; }
  .post-content h1 { font-size: 1.6rem; }
  .entry-thumb { width: 64px; height: 64px; }
}


/* ---------- Dark-mode polish ---------- */

.post-gallery img,
.entry-thumb {
  filter: brightness(0.92) contrast(1.03);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.05);
}

::selection {
  background: var(--accent);
  color: var(--paper);
}