/* ============================================================
   CBAMtools — main stylesheet
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght,SOFT@9..144,400;9..144,500;9..144,600;9..144,700&family=IBM+Plex+Mono:wght@400;500&family=IBM+Plex+Sans:wght@400;500;600&display=swap');
@import url('./tokens.css');

/* ============================================================
   Reset & base
   ============================================================ */

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  font-feature-settings: 'kern', 'liga', 'calt';
}

/* Subtle paper texture — gives editorial warmth without being twee */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.4;
  background-image: radial-gradient(circle at 1px 1px, rgba(26,26,23,0.03) 1px, transparent 0);
  background-size: 24px 24px;
}

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

/* ============================================================
   Typography
   ============================================================ */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--color-primary-900);
  margin: 0 0 var(--space-4);
  /* Fraunces variable settings: lower SOFT for serious feel, opsz scales by size */
  font-variation-settings: 'SOFT' 30, 'opsz' 30;
}

h1 { font-size: var(--text-3xl); font-variation-settings: 'SOFT' 20, 'opsz' 100; }
h2 { font-size: var(--text-2xl); font-variation-settings: 'SOFT' 30, 'opsz' 60; }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); font-weight: 600; }

p { margin: 0 0 var(--space-5); }
p + p { margin-top: 0; }

a {
  color: var(--color-primary-700);
  text-decoration-line: underline;
  text-decoration-color: var(--color-primary-300);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: text-decoration-color var(--duration-fast) var(--ease-out);
}
a:hover {
  text-decoration-color: var(--color-primary-700);
}

strong { font-weight: 600; color: var(--color-primary-900); }

code, kbd, samp, pre {
  font-family: var(--font-mono);
  font-size: 0.92em;
}

code {
  background: var(--color-bg-subtle);
  padding: 0.1em 0.35em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-rule);
}

blockquote {
  border-left: 3px solid var(--color-accent-500);
  padding: var(--space-2) var(--space-6);
  margin: var(--space-8) 0;
  font-family: var(--font-display);
  font-style: italic;
  font-size: var(--text-lg);
  color: var(--color-primary-800);
  font-variation-settings: 'SOFT' 80, 'opsz' 60;
}

hr {
  border: 0;
  height: 1px;
  background: var(--color-rule);
  margin: var(--space-12) 0;
}

/* Editorial section divider — used inside articles */
.divider {
  text-align: center;
  margin: var(--space-12) 0;
  color: var(--color-ink-soft);
  letter-spacing: var(--tracking-caps);
  font-size: var(--text-sm);
}
.divider::before { content: '◆ ◆ ◆'; }

/* ============================================================
   Layout primitives
   ============================================================ */

.container {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: 0 var(--space-6);
  position: relative;
  z-index: 1;
}

.container--narrow { max-width: var(--content-medium); }
.container--prose  { max-width: var(--content-narrow); }

/* ============================================================
   Site header
   ============================================================ */

.site-header {
  border-bottom: 1px solid var(--color-rule);
  background: var(--color-bg);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
  padding: var(--space-4) 0;
}

.brand {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--color-primary-800);
  text-decoration: none;
  letter-spacing: var(--tracking-tight);
  font-variation-settings: 'SOFT' 20, 'opsz' 60;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.brand__mark {
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--color-primary-700);
  position: relative;
}
.brand__mark::after {
  content: '';
  position: absolute;
  inset: 3px;
  border-radius: 50%;
  background: var(--color-accent-500);
}

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

.site-nav a {
  color: var(--color-ink);
  text-decoration: none;
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: var(--tracking-caps);
  font-weight: 500;
}
.site-nav a:hover { color: var(--color-primary-700); }

.site-nav a.active {
  color: var(--color-primary-700);
  border-bottom: 2px solid var(--color-accent-500);
  padding-bottom: 2px;
}

/* Language switcher */
.lang-switch {
  display: flex;
  gap: var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
}
.lang-switch a {
  padding: 4px 8px;
  text-decoration: none;
  color: var(--color-ink-soft);
}
.lang-switch a.current {
  color: var(--color-primary-800);
  background: var(--color-bg-subtle);
  border-radius: var(--radius-sm);
}
.lang-switch a:hover { color: var(--color-primary-700); }

/* ============================================================
   Hero
   ============================================================ */

.hero {
  padding: var(--space-24) 0 var(--space-16);
  border-bottom: 1px solid var(--color-rule);
  position: relative;
  overflow: hidden;
}

.hero__eyebrow {
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--color-accent-700);
  font-weight: 500;
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.hero__eyebrow::before {
  content: '';
  width: 32px;
  height: 1px;
  background: var(--color-accent-500);
}

.hero__title {
  font-size: clamp(2rem, 5vw, var(--text-4xl));
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.025em;
  margin-bottom: var(--space-6);
  max-width: 18ch;
  font-variation-settings: 'SOFT' 10, 'opsz' 144;
}

.hero__lead {
  font-size: var(--text-lg);
  color: var(--color-ink-muted);
  max-width: 56ch;
  margin-bottom: var(--space-8);
}

.hero__actions { display: flex; gap: var(--space-4); flex-wrap: wrap; }

/* ============================================================
   Buttons & CTAs
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--duration-base) var(--ease-out);
}

.btn--primary {
  background: var(--color-primary-700);
  color: var(--color-ink-inverse);
}
.btn--primary:hover {
  background: var(--color-primary-800);
}

.btn--accent {
  background: var(--color-accent-500);
  color: var(--color-primary-900);
}
.btn--accent:hover {
  background: var(--color-accent-600);
  color: var(--color-bg);
}

.btn--ghost {
  background: transparent;
  color: var(--color-primary-800);
  border-color: var(--color-primary-700);
}
.btn--ghost:hover {
  background: var(--color-primary-700);
  color: var(--color-ink-inverse);
}

.btn__arrow {
  display: inline-block;
  transition: transform var(--duration-base) var(--ease-out);
}
.btn:hover .btn__arrow { transform: translateX(3px); }

/* ============================================================
   Conversion CTA box (the funnel-driver to cbam.tensig.eu)
   Used at end of articles and on landing.
   ============================================================ */

.conversion-box {
  background: var(--color-primary-700);
  color: var(--color-ink-inverse);
  padding: var(--space-10) var(--space-8);
  margin: var(--space-12) 0;
  position: relative;
  overflow: hidden;
}
.conversion-box::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, var(--color-primary-600) 0%, transparent 70%);
  transform: translate(50%, -50%);
}

.conversion-box__eyebrow {
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--color-accent-300);
  margin-bottom: var(--space-3);
}

.conversion-box__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-variation-settings: 'SOFT' 30, 'opsz' 60;
  color: var(--color-ink-inverse);
  margin-bottom: var(--space-4);
  max-width: 28ch;
  position: relative;
}

.conversion-box__body {
  color: var(--color-primary-100);
  margin-bottom: var(--space-6);
  max-width: 56ch;
  position: relative;
}

.conversion-box .btn--accent {
  position: relative;
}

/* ============================================================
   Section / content blocks
   ============================================================ */

.section {
  padding: var(--space-16) 0;
}

.section__eyebrow {
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--color-ink-soft);
  margin-bottom: var(--space-3);
}

.section__title {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-8);
  max-width: 22ch;
}

/* Three-up grid for "what is CBAM" cards */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-8);
}

.card {
  border-top: 2px solid var(--color-primary-700);
  padding-top: var(--space-5);
}

.card__num {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-accent-700);
  margin-bottom: var(--space-2);
}

.card__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  margin-bottom: var(--space-3);
  font-variation-settings: 'SOFT' 30, 'opsz' 30;
}

.card__body {
  color: var(--color-ink-muted);
  font-size: var(--text-base);
}

/* ============================================================
   Insights index — post list
   ============================================================ */

.posts-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.posts-list__item {
  border-top: 1px solid var(--color-rule);
  padding: var(--space-8) 0;
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: var(--space-8);
  transition: padding-left var(--duration-base) var(--ease-out);
}
.posts-list__item:hover {
  padding-left: var(--space-3);
}
.posts-list__item:last-child {
  border-bottom: 1px solid var(--color-rule);
}

.posts-list__meta {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-soft);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

.posts-list__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 500;
  margin: 0 0 var(--space-2);
  font-variation-settings: 'SOFT' 30, 'opsz' 30;
}
.posts-list__title a {
  color: var(--color-primary-900);
  text-decoration: none;
}
.posts-list__title a:hover { color: var(--color-primary-700); }

.posts-list__excerpt {
  color: var(--color-ink-muted);
  margin: 0;
  font-size: var(--text-base);
}

.posts-list__badges {
  display: inline-flex;
  gap: var(--space-2);
  margin-top: var(--space-2);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  background: var(--color-bg-subtle);
  color: var(--color-ink-muted);
  border: 1px solid var(--color-rule);
}

.badge--audio {
  background: var(--color-accent-100);
  color: var(--color-accent-700);
  border-color: var(--color-accent-300);
}

/* ============================================================
   Article (post detail)
   ============================================================ */

.article {
  padding: var(--space-12) 0 var(--space-8);
}

.article__meta {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-ink-soft);
  margin-bottom: var(--space-6);
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  align-items: center;
}

.article__title {
  font-size: clamp(2rem, 4.5vw, 3.25rem);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.08;
  margin-bottom: var(--space-6);
  max-width: 22ch;
  font-variation-settings: 'SOFT' 15, 'opsz' 144;
}

.article__lead {
  font-size: var(--text-lg);
  color: var(--color-ink-muted);
  max-width: 56ch;
  margin-bottom: var(--space-10);
  line-height: var(--leading-normal);
}

.article__body {
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
}

/* Drop cap on first paragraph — editorial flourish */
.article__body > p:first-of-type::first-letter {
  font-family: var(--font-display);
  font-size: 3.4em;
  float: left;
  line-height: 0.9;
  margin: 0.05em 0.08em 0 0;
  color: var(--color-primary-700);
  font-weight: 500;
  font-variation-settings: 'SOFT' 10, 'opsz' 144;
}

.article__body h2 {
  font-size: var(--text-xl);
  margin-top: var(--space-12);
  margin-bottom: var(--space-4);
}

.article__body h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
  color: var(--color-primary-800);
}

.article__body ul, .article__body ol {
  padding-left: var(--space-6);
  margin: 0 0 var(--space-5);
}
.article__body li { margin-bottom: var(--space-2); }

/* Pull-quote / regulatory citation */
.article__pullquote {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  line-height: 1.4;
  color: var(--color-primary-800);
  border-top: 2px solid var(--color-accent-500);
  border-bottom: 2px solid var(--color-accent-500);
  padding: var(--space-6) 0;
  margin: var(--space-10) 0;
  text-align: center;
  font-variation-settings: 'SOFT' 50, 'opsz' 60;
}

/* ============================================================
   Audio overview player (NotebookLM)
   ============================================================ */

.audio-player {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-rule);
  border-left: 3px solid var(--color-accent-500);
  padding: var(--space-5) var(--space-6);
  margin: var(--space-8) 0;
  display: flex;
  align-items: center;
  gap: var(--space-5);
  flex-wrap: wrap;
}

.audio-player__icon {
  width: 36px; height: 36px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--color-accent-100);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent-700);
}

.audio-player__meta {
  flex: 1;
  min-width: 200px;
}

.audio-player__label {
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: var(--tracking-caps);
  color: var(--color-accent-700);
  margin-bottom: 2px;
}

.audio-player__title {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-primary-900);
}

.audio-player audio {
  width: 100%;
  margin-top: var(--space-3);
  flex-basis: 100%;
}

/* ============================================================
   Footer
   ============================================================ */

.site-footer {
  border-top: 1px solid var(--color-rule);
  padding: var(--space-12) 0 var(--space-8);
  margin-top: var(--space-24);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}

.site-footer__col h5 {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: var(--tracking-caps);
  color: var(--color-ink-soft);
  margin-bottom: var(--space-4);
}

.site-footer__col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.site-footer__col li {
  margin-bottom: var(--space-2);
}

.site-footer__col a {
  color: var(--color-ink);
  text-decoration: none;
}
.site-footer__col a:hover {
  color: var(--color-primary-700);
  text-decoration: underline;
}

.site-footer__bottom {
  border-top: 1px solid var(--color-rule);
  padding-top: var(--space-6);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
  font-size: var(--text-xs);
  color: var(--color-ink-soft);
}

.site-footer__credit {
  font-family: var(--font-mono);
}

/* ============================================================
   Responsive
   ============================================================ */

@media (max-width: 760px) {
  .site-header__inner { gap: var(--space-3); }
  .site-nav { gap: var(--space-4); }
  .site-nav a { font-size: var(--text-xs); }
  .hero { padding: var(--space-16) 0 var(--space-10); }
  .posts-list__item {
    grid-template-columns: 1fr;
    gap: var(--space-2);
  }
  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
}

/* ============================================================
   Utilities
   ============================================================ */

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}