/*
 * SWIFTUS — Theme
 * Technical Blueprint meets Historic Organic.
 * "The Recovered Architect."
 */

/* ============================================================
   CUSTOM PROPERTIES
   ============================================================ */
:root {
  /* Core palette */
  --c-bg:           #0B1829;
  --c-bg-2:         #0E2140;
  --c-bg-3:         #162B50;
  --c-text:         #EDE5D8;
  --c-text-muted:   #9A8E80;
  --c-text-faint:   #4A5568;
  --c-gold:         #B89B5E;
  --c-gold-bright:  #CEB574;
  --c-gold-dim:     rgba(184, 155, 94, 0.25);
  --c-gold-faint:   rgba(184, 155, 94, 0.08);
  --c-blue:         #0B3D91;
  --c-border:       rgba(184, 155, 94, 0.12);
  --c-border-md:    rgba(184, 155, 94, 0.28);

  /* Typography */
  --f-display: 'Fraunces', Georgia, serif;
  --f-body:    'Source Serif 4', Georgia, serif;
  --f-mono:    'DM Mono', 'Courier New', monospace;

  /* Spacing scale */
  --sp-1:  0.25rem;
  --sp-2:  0.5rem;
  --sp-3:  0.75rem;
  --sp-4:  1rem;
  --sp-5:  1.25rem;
  --sp-6:  1.5rem;
  --sp-8:  2rem;
  --sp-10: 2.5rem;
  --sp-12: 3rem;
  --sp-16: 4rem;
  --sp-20: 5rem;
  --sp-24: 6rem;
  --sp-32: 8rem;

  /* Layout */
  --w-content: 700px;
  --w-wide:    1080px;
  --w-max:     1360px;

  /* Transitions */
  --t-fast: 0.15s ease;
  --t-mid:  0.25s ease;
}

/* ============================================================
   RESET
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ============================================================
   BASE
   ============================================================ */
html {
  scroll-behavior: smooth;
  text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--c-bg);
  color: var(--c-text);
  font-family: var(--f-body);
  font-size: 1.0625rem;
  line-height: 1.75;
  font-optical-sizing: auto;
  min-height: 100vh;
  /* Blueprint grid — very subtle */
  background-image:
    linear-gradient(rgba(184, 155, 94, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(184, 155, 94, 0.025) 1px, transparent 1px);
  background-size: 64px 64px;
  background-attachment: fixed;
}

/* ============================================================
   TYPOGRAPHY
   ============================================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--f-display);
  font-weight: 300;
  line-height: 1.15;
  color: var(--c-text);
  letter-spacing: -0.025em;
}

h1 { font-size: clamp(2.25rem, 5vw, 4.5rem); font-optical-sizing: auto; }
h2 { font-size: clamp(1.625rem, 3vw, 2.75rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.625rem); }
h4 { font-size: 1.125rem; font-weight: 500; }

p { margin-bottom: var(--sp-4); }
p:last-child { margin-bottom: 0; }

a {
  color: var(--c-gold);
  text-decoration: none;
  transition: color var(--t-fast);
}

a:hover {
  color: var(--c-gold-bright);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ============================================================
   LAYOUT CONTAINERS
   ============================================================ */
.container {
  max-width: var(--w-wide);
  margin: 0 auto;
  padding: 0 var(--sp-8);
}

.container--narrow {
  max-width: var(--w-content);
  margin: 0 auto;
  padding: 0 var(--sp-8);
}

/* ============================================================
   READING PROGRESS BAR
   ============================================================ */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: var(--progress, 0%);
  background: linear-gradient(90deg, var(--c-blue), var(--c-gold));
  z-index: 200;
  transition: width 0.1s linear;
  pointer-events: none;
}

/* ============================================================
   SITE HEADER
   ============================================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: 3.5rem;
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--c-border);
  background: rgba(11, 24, 41, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--w-max);
  margin: 0 auto;
  padding: 0 var(--sp-8);
}

.site-logo {
  font-family: var(--f-display);
  font-size: 1.1875rem;
  font-weight: 600;
  letter-spacing: -0.04em;
  color: var(--c-text);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.1em;
  transition: opacity var(--t-fast);
}

.site-logo:hover {
  color: var(--c-text);
  opacity: 0.8;
}

.site-logo__slash {
  color: var(--c-gold);
  font-weight: 300;
  font-size: 1.4em;
  line-height: 0;
  margin-right: 0.05em;
  position: relative;
  top: 0.05em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--sp-8);
}

.site-nav a {
  font-family: var(--f-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-text-muted);
  text-decoration: none;
  transition: color var(--t-fast);
}

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

/* ============================================================
   MAIN CONTENT OFFSET
   ============================================================ */
#main {
  padding-top: 3.5rem;
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  min-height: calc(100vh - 3.5rem);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--sp-20) 0 var(--sp-16);
  position: relative;
  overflow: hidden;
}

/* Atmospheric radial glow */
.hero::before {
  content: '';
  position: absolute;
  top: -10%;
  right: -5%;
  width: 65%;
  height: 80%;
  background: radial-gradient(
    ellipse at center,
    rgba(11, 61, 145, 0.18) 0%,
    transparent 65%
  );
  pointer-events: none;
}

/* Coordinate annotation — bottom right */
.hero::after {
  content: 'A.00';
  position: absolute;
  bottom: var(--sp-8);
  right: var(--sp-8);
  font-family: var(--f-mono);
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  color: var(--c-text-faint);
  opacity: 0.4;
}

.hero__inner {
  max-width: var(--w-max);
  margin: 0 auto;
  padding: 0 var(--sp-8);
}

.hero__eyebrow {
  font-family: var(--f-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-gold);
  margin-bottom: var(--sp-6);
  display: inline-flex;
  align-items: center;
  gap: var(--sp-3);
  opacity: 0;
  animation: riseIn 0.9s cubic-bezier(0.16, 1, 0.3, 1) 0.1s forwards;
}

.hero__eyebrow::before {
  content: '';
  display: block;
  width: 2rem;
  height: 1px;
  background: currentColor;
  flex-shrink: 0;
}

.hero__headline {
  font-size: clamp(3rem, 7.5vw, 7.5rem);
  font-weight: 300;
  line-height: 1.0;
  letter-spacing: -0.04em;
  max-width: 13ch;
  margin-bottom: var(--sp-8);
  opacity: 0;
  animation: riseIn 0.9s cubic-bezier(0.16, 1, 0.3, 1) 0.2s forwards;
}

.hero__headline em {
  font-style: italic;
  color: var(--c-gold);
}

.hero__sub {
  font-size: clamp(0.9375rem, 1.5vw, 1.125rem);
  color: var(--c-text-muted);
  max-width: 50ch;
  line-height: 1.7;
  margin-bottom: var(--sp-10);
  opacity: 0;
  animation: riseIn 0.9s cubic-bezier(0.16, 1, 0.3, 1) 0.35s forwards;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  opacity: 0;
  animation: riseIn 0.9s cubic-bezier(0.16, 1, 0.3, 1) 0.5s forwards;
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  font-family: var(--f-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: var(--sp-3) var(--sp-6);
  border: 1px solid transparent;
  text-decoration: none;
  display: inline-block;
  transition: background var(--t-mid), color var(--t-mid), border-color var(--t-mid);
  cursor: pointer;
}

.btn--primary {
  background: var(--c-gold);
  border-color: var(--c-gold);
  color: var(--c-bg);
}

.btn--primary:hover {
  background: var(--c-gold-bright);
  border-color: var(--c-gold-bright);
  color: var(--c-bg);
}

.btn--ghost {
  background: transparent;
  border-color: var(--c-border-md);
  color: var(--c-text-muted);
}

.btn--ghost:hover {
  border-color: var(--c-gold);
  color: var(--c-gold);
}

/* ============================================================
   SECTIONS
   ============================================================ */
.section {
  padding: var(--sp-20) 0;
  border-top: 1px solid var(--c-border);
  position: relative;
}

.section__header {
  display: flex;
  align-items: baseline;
  gap: var(--sp-5);
  margin-bottom: var(--sp-12);
}

.section__coord {
  font-family: var(--f-mono);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--c-gold);
  opacity: 0.7;
  flex-shrink: 0;
}

.section__title {
  font-size: clamp(1.375rem, 2.5vw, 2.25rem);
  font-weight: 300;
  margin: 0;
  letter-spacing: -0.025em;
}

/* ============================================================
   PILLARS GRID
   ============================================================ */
.pillars {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--sp-5) var(--sp-8);
}

.pillar {
  padding: var(--sp-5) var(--sp-5) var(--sp-5) var(--sp-6);
  border-left: 2px solid var(--c-gold-dim);
  background: var(--c-gold-faint);
  transition: border-color var(--t-mid), background var(--t-mid);
}

.pillar:hover {
  border-left-color: var(--c-gold);
  background: rgba(184, 155, 94, 0.06);
}

.pillar__coord {
  font-family: var(--f-mono);
  font-size: 0.6rem;
  color: var(--c-gold);
  letter-spacing: 0.1em;
  opacity: 0.6;
  margin-bottom: var(--sp-3);
  display: block;
}

.pillar__title {
  font-family: var(--f-display);
  font-size: 1.0625rem;
  font-weight: 500;
  letter-spacing: -0.015em;
  margin-bottom: var(--sp-2);
  color: var(--c-text);
}

.pillar__desc {
  font-size: 0.9rem;
  color: var(--c-text-muted);
  line-height: 1.65;
  margin: 0;
}

/* ============================================================
   POST LIST
   ============================================================ */
.post-list {
  list-style: none;
  display: flex;
  flex-direction: column;
}

.post-item {
  display: grid;
  grid-template-columns: 8rem 1fr;
  gap: var(--sp-6);
  align-items: start;
  padding: var(--sp-5) 0;
  border-bottom: 1px solid var(--c-border);
  transition: background var(--t-fast);
}

.post-item:first-child {
  border-top: 1px solid var(--c-border);
}

.post-item__date {
  font-family: var(--f-mono);
  font-size: 0.68rem;
  color: var(--c-text-faint);
  letter-spacing: 0.06em;
  padding-top: 0.2em;
  white-space: nowrap;
}

.post-item__title {
  font-family: var(--f-display);
  font-size: 1.0625rem;
  font-weight: 400;
  color: var(--c-text);
  text-decoration: none;
  display: block;
  letter-spacing: -0.01em;
  margin-bottom: var(--sp-1);
  transition: color var(--t-fast);
}

.post-item__title:hover {
  color: var(--c-gold);
}

.post-item__desc {
  font-size: 0.875rem;
  color: var(--c-text-muted);
  line-height: 1.55;
  margin: 0;
}

/* ============================================================
   INLINE LINKS / UTILITY
   ============================================================ */
.text-link {
  font-family: var(--f-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--c-text-muted);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  transition: color var(--t-fast);
}

.text-link:hover {
  color: var(--c-gold);
}

.text-link--back::before { content: '←'; }
.text-link--forward::after { content: '→'; }

/* ============================================================
   ARTICLE HEADER
   ============================================================ */
.article-header {
  padding: var(--sp-12) 0 var(--sp-10);
}

.article-meta {
  font-family: var(--f-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-text-faint);
  margin-bottom: var(--sp-6);
  display: flex;
  align-items: center;
  gap: var(--sp-4);
}

.article-meta::before {
  content: '';
  display: block;
  width: 1.5rem;
  height: 1px;
  background: var(--c-gold);
  flex-shrink: 0;
}

.article-meta__sep {
  opacity: 0.4;
}

.article-title {
  font-size: clamp(2rem, 4.5vw, 4.25rem);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -0.035em;
  margin-bottom: var(--sp-5);
  max-width: 22ch;
}

.article-description {
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  color: var(--c-text-muted);
  max-width: 52ch;
  line-height: 1.65;
  margin: 0;
}

/* ============================================================
   ARTICLE RULE
   ============================================================ */
.article-rule {
  border: none;
  border-top: 1px solid var(--c-border);
  margin: var(--sp-8) 0;
}

.article-rule--gold {
  border-top: 1px solid var(--c-gold-dim);
}

/* ============================================================
   ARTICLE BODY CONTENT
   ============================================================ */
.article-content {
  padding: var(--sp-10) 0 var(--sp-24);
}

.article-body {
  font-size: 1rem;
  line-height: 1.85;
  color: #DDD5C6;
}

.article-body > * + * {
  margin-top: var(--sp-4);
}

.article-body h2 {
  font-size: 1.625rem;
  font-weight: 400;
  margin-top: var(--sp-12);
  margin-bottom: var(--sp-3);
  color: var(--c-text);
  letter-spacing: -0.025em;
}

.article-body h3 {
  font-size: 1.1875rem;
  font-weight: 500;
  margin-top: var(--sp-8);
  margin-bottom: var(--sp-2);
  color: var(--c-text);
  letter-spacing: -0.015em;
}

.article-body h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-top: var(--sp-6);
  margin-bottom: var(--sp-2);
  font-family: var(--f-mono);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-size: 0.8125rem;
  color: var(--c-gold);
}

.article-body a {
  color: var(--c-gold);
  text-decoration: underline;
  text-decoration-color: var(--c-gold-dim);
  text-underline-offset: 3px;
}

.article-body a:hover {
  color: var(--c-gold-bright);
  text-decoration-color: var(--c-gold);
}

.article-body strong {
  font-weight: 600;
  color: var(--c-text);
}

.article-body em {
  font-style: italic;
}

.article-body blockquote {
  border-left: 2px solid var(--c-gold);
  padding: var(--sp-4) var(--sp-6);
  margin: var(--sp-8) 0;
  background: var(--c-gold-faint);
}

.article-body blockquote p {
  font-style: italic;
  font-size: 1.125rem;
  color: var(--c-text);
  margin: 0;
}

.article-body blockquote cite {
  display: block;
  font-size: 0.8125rem;
  font-family: var(--f-mono);
  color: var(--c-text-muted);
  margin-top: var(--sp-3);
  font-style: normal;
  letter-spacing: 0.05em;
}

.article-body code {
  font-family: var(--f-mono);
  font-size: 0.875em;
  background: var(--c-bg-3);
  padding: 0.1em 0.45em 0.15em;
  color: var(--c-gold-bright);
  border: 1px solid var(--c-border);
}

.article-body pre {
  background: var(--c-bg-2);
  border: 1px solid var(--c-border);
  border-left: 3px solid var(--c-gold-dim);
  padding: var(--sp-6);
  overflow-x: auto;
  margin: var(--sp-8) 0;
}

.article-body pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.875rem;
  color: var(--c-text-muted);
}

.article-body ul,
.article-body ol {
  padding-left: var(--sp-6);
}

.article-body li {
  margin-bottom: var(--sp-2);
  padding-left: var(--sp-2);
}

.article-body ul li::marker {
  color: var(--c-gold);
}

.article-body hr {
  border: none;
  border-top: 1px solid var(--c-border);
  margin: var(--sp-10) 0;
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
  margin: var(--sp-8) 0;
}

.article-body th {
  font-family: var(--f-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-gold);
  text-align: left;
  padding: var(--sp-3) var(--sp-4);
  border-bottom: 1px solid var(--c-border-md);
}

.article-body td {
  padding: var(--sp-3) var(--sp-4);
  border-bottom: 1px solid var(--c-border);
  color: var(--c-text-muted);
}

/* ============================================================
   SECTION HEADER (blog listing, etc.)
   ============================================================ */
.page-header {
  padding: var(--sp-12) 0 var(--sp-10);
}

.page-header__eyebrow {
  font-family: var(--f-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-gold);
  margin-bottom: var(--sp-4);
  display: inline-flex;
  align-items: center;
  gap: var(--sp-3);
}

.page-header__eyebrow::before {
  content: '';
  display: block;
  width: 1.5rem;
  height: 1px;
  background: currentColor;
  flex-shrink: 0;
}

.page-header__title {
  font-size: clamp(2rem, 4.5vw, 4rem);
  font-weight: 300;
  letter-spacing: -0.03em;
  margin: 0;
}

/* ============================================================
   SITE FOOTER
   ============================================================ */
.site-footer {
  border-top: 1px solid var(--c-border);
  padding: var(--sp-10) 0;
}

.site-footer__inner {
  max-width: var(--w-max);
  margin: 0 auto;
  padding: 0 var(--sp-8);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--sp-4);
}

.site-footer__left {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}

.site-footer__wordmark {
  font-family: var(--f-display);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--c-text-muted);
}

.site-footer__copy {
  font-family: var(--f-mono);
  font-size: 0.65rem;
  letter-spacing: 0.05em;
  color: var(--c-text-faint);
  margin: 0;
}

.site-footer__nav {
  display: flex;
  gap: var(--sp-6);
  align-items: center;
}

.site-footer__nav a {
  font-family: var(--f-mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-text-faint);
  text-decoration: none;
  transition: color var(--t-fast);
}

.site-footer__nav a:hover {
  color: var(--c-gold);
}

/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes riseIn {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
  .site-header__inner,
  .hero__inner,
  .site-footer__inner {
    padding: 0 var(--sp-5);
  }

  .container,
  .container--narrow {
    padding: 0 var(--sp-5);
  }

  .hero {
    min-height: calc(90vh - 3.5rem);
    padding: var(--sp-12) 0 var(--sp-10);
  }

  .section {
    padding: var(--sp-12) 0;
  }

  .post-item {
    grid-template-columns: 1fr;
    gap: var(--sp-1);
  }

  .post-item__date {
    padding-top: 0;
  }

  .site-nav {
    gap: var(--sp-5);
  }

  .pillars {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero__actions {
    flex-direction: column;
  }

  .btn {
    text-align: center;
  }
}