/* ============================================================
   1. CSS Custom Properties (Design Tokens)
   ============================================================ */
:root {
  --color-bg:      #F6F2EF;
  --color-text:    #464445;
  --color-accent:  #4A5568;
  --color-border:  #E4E0DD;
  --color-muted:   #ACA8A5;

  --font-base: 'Inter', sans-serif;

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-6: 3rem;
  --space-8: 4rem;

  --max-width: 860px;
}

/* ============================================================
   2. Reset / Base Styles
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-base);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

a:hover {
  text-decoration: underline;
}

ul {
  list-style: none;
}

/* ============================================================
   3. Typography
   ============================================================ */
h1 {
  font-size: 2rem;
  line-height: 1.2;
  font-weight: 700;
  color: var(--color-text);
}

h2 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-text);
}

h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
}

p {
  font-size: 1rem;
  line-height: 1.6;
}

small,
.meta {
  font-size: 0.875rem;
  color: var(--color-muted);
}

/* ============================================================
   4. Layout
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-3);
}

section {
  padding: var(--space-8) 0;
}

section + section {
  border-top: 1px solid var(--color-border);
}

/* ============================================================
   5. Navigation
   ============================================================ */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-2) 0;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-3);
}

.nav-brand {
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-text);
}

.nav-brand:hover {
  text-decoration: none;
  color: var(--color-accent);
}

.nav-links {
  display: flex;
  gap: var(--space-3);
}

.nav-links a {
  font-size: 0.875rem;
  color: var(--color-muted);
  transition: color 0.15s ease;
}

.nav-links a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

/* ============================================================
   6. Components — Cards, Tags
   ============================================================ */

/* --- Hero --- */
#hero {
  --color-hero-bg: #464445;
  --color-hero-text: #ffffff;
  --color-hero-muted: #ffffff;

  background-color: var(--color-hero-bg);
  padding-top: var(--space-8);
  padding-bottom: var(--space-6);
}

.hero-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  text-align: center;
}

.hero-avatar {
  flex-shrink: 0;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  object-fit: cover;
  background-color: #464445;
}

.hero-text {
  display: flex;
  flex-direction: column;
}

#hero h1 {
  color: var(--color-hero-text);
  margin-bottom: var(--space-1);
}

.hero-title {
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--color-hero-muted);
  margin-bottom: var(--space-2);
}

.hero-tagline {
  font-size: 1rem;
  color: var(--color-hero-muted);
  max-width: 560px;
}

/* --- Section headings --- */
.section-heading {
  margin-bottom: var(--space-4);
}

/* --- Project Grid --- */
.project-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}

/* --- Project Card --- */
.project-card {
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: var(--space-3);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.project-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

/* --- Card header: title + year in a flex row --- */
.card-header {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  margin-bottom: var(--space-1);
}

.card-header h3 {
  flex: 1;
  min-width: 0;
  margin-bottom: 0;
  font-size: 1.05rem;
}

.card-header .project-year {
  flex-shrink: 0;
  padding-top: 0.2rem;
}

.project-card h3 {
  margin-bottom: var(--space-1);
  font-size: 1.05rem;
}

.project-card h3 a {
  color: var(--color-text);
}

.project-card h3 a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

/* --- Project year label --- */
.project-year {
  display: block;
  font-size: 0.75rem;
  color: var(--color-muted);
  white-space: nowrap;
  line-height: 1;
}

.project-summary {
  font-size: 0.9rem;
  color: var(--color-muted);
  margin-bottom: var(--space-2);
}

/* --- Tags --- */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-accent);
  background-color: var(--color-border);
  border-radius: 4px;
  padding: 0.2rem 0.5rem;
  white-space: nowrap;
}

/* --- About Section --- */
#about {
  --color-about-bg: #464445;
  --color-about-text: #FFFFFF;
  --color-about-muted: #FFFFFF;

  background-color: var(--color-about-bg);
  border-top-color: transparent;
}

#about h2 {
  color: var(--color-about-text);
}

#about p {
  color: var(--color-about-muted);
}

.about-body {
  max-width: 680px;
}

.about-body p + p {
  margin-top: var(--space-2);
}

/* --- Contact Section --- */
.contact-email {
  font-size: 1rem;
  margin-bottom: var(--space-3);
}

.contact-email a {
  color: var(--color-text);
  font-weight: 500;
}

.contact-email a:hover {
  color: var(--color-accent);
}

.social-links {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 0.875rem;
  color: var(--color-muted);
  transition: color 0.15s ease;
}

.social-link:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.social-link img {
  width: 20px;
  height: 20px;
  opacity: 0.6;
}

.social-link:hover img {
  opacity: 1;
}

/* ============================================================
   7. Project Pages
   ============================================================ */
.project-page-header {
  padding-top: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-4);
}

.project-page-header h1 {
  margin-bottom: var(--space-2);
}

.project-page-header .project-year {
  margin-top: var(--space-1);
}

.project-back {
  display: inline-block;
  font-size: 0.875rem;
  color: var(--color-muted);
  margin-bottom: var(--space-3);
}

.project-back:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.project-section {
  margin-bottom: var(--space-4);
}

.project-section h2 {
  margin-bottom: var(--space-2);
}

.project-section p + p {
  margin-top: var(--space-2);
}

.project-section ul {
  list-style: disc;
  padding-left: var(--space-3);
}

.project-section ul li + li {
  margin-top: var(--space-1);
}

.project-image {
  border: 1px solid var(--color-border);
  border-radius: 6px;
  overflow: hidden;
  margin-bottom: var(--space-3);
}

.outcomes-list {
  list-style: none;
  padding: 0;
}

.outcomes-list li {
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 1rem;
}

.outcomes-list li:last-child {
  border-bottom: none;
}

/* --- Project steps (ordered list) --- */
.project-steps {
  padding-left: var(--space-3);
  margin-top: var(--space-2);
}

.project-steps li {
  padding: var(--space-1) 0;
  line-height: 1.6;
}

.project-steps li + li {
  margin-top: var(--space-1);
}

/* --- Results section note (e.g. "mock data" qualifier) --- */
.results-note {
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--color-muted);
}

/* --- Project role/tools meta line --- */
.project-role-meta {
  margin-top: var(--space-2);
  font-size: 0.875rem;
  color: var(--color-muted);
}

/* --- Stat grid --- */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
  margin-top: var(--space-3);
}

.stat-item {
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--color-muted);
  line-height: 1.4;
}

/* --- Project callout block --- */
.project-callout {
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent);
  border-radius: 6px;
  padding: var(--space-3);
}

.project-callout-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-accent);
  margin-bottom: var(--space-1);
}

.project-callout p + p {
  margin-top: var(--space-2);
}

.project-callout-link {
  display: inline-block;
  margin-top: var(--space-2);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-accent);
}

.project-callout-link:hover {
  text-decoration: underline;
}

/* --- Enrichment flow diagram --- */
.enrichment-flow {
  margin: var(--space-4) 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.ef-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  max-width: 500px;
}

.ef-box {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  background-color: var(--color-border);
  border: 1.5px solid var(--color-accent);
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
  text-align: center;
}

.ef-fallback {
  font-size: 0.75rem;
  color: var(--color-muted);
  margin-top: var(--space-1);
  font-style: italic;
}

.ef-arrow {
  color: var(--color-accent);
  font-size: 1.25rem;
  line-height: 1;
  padding: 0.35rem 0;
  user-select: none;
}

.ef-group-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-muted);
  margin-bottom: var(--space-1);
  text-align: center;
}

.ef-box-multi {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  justify-content: center;
  padding: var(--space-2) var(--space-3);
  background-color: var(--color-border);
  border: 1.5px solid var(--color-accent);
  border-radius: 6px;
  width: 100%;
}

.ef-box-multi span {
  background-color: #FFFFFF;
  border: 1px solid var(--color-accent);
  border-radius: 4px;
  padding: 0.2rem 0.65rem;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text);
  white-space: nowrap;
}

/* --- Stat grid — 2-column variant --- */
.stat-grid--2col {
  grid-template-columns: repeat(2, 1fr);
}

/* --- Case study links (primary + secondary hierarchy) --- */
.project-case-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.project-case-link-primary {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-accent);
}

.project-case-link-secondary {
  font-size: 0.875rem;
  color: var(--color-muted);
}

.project-case-link-secondary:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

/* --- Before/after flow diagram --- */
.before-after-flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin: var(--space-4) 0;
}

.baf-column {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.baf-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-2);
}

.baf-label--before {
  color: var(--color-muted);
}

.baf-label--after {
  color: var(--color-accent);
}

.baf-time {
  font-size: 1.5rem;
  font-weight: 700;
  text-align: center;
  padding: var(--space-2) var(--space-3);
  border-radius: 6px;
  width: 100%;
}

.baf-time--before {
  color: var(--color-muted);
  background-color: var(--color-border);
  border: 1.5px solid var(--color-muted);
}

.baf-time--after {
  color: var(--color-accent);
  background-color: var(--color-border);
  border: 1.5px solid var(--color-accent);
}

/* --- Project images --- */
.project-image {
  text-align: center;
}

.project-image img {
  display: block;
  max-width: 100%;
  border-radius: 6px;
  margin: 1.5rem auto;
}

.project-image figcaption {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin-top: 0.5rem;
}

/* --- Project video (16:9 responsive wrapper) --- */
.project-video {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  margin: 1.5rem 0;
}

.project-video iframe,
.project-video video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

/* ============================================================
   8. Footer
   ============================================================ */
footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-4) 0;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-3);
  font-size: 0.875rem;
  color: var(--color-muted);
}

/* ============================================================
   9. Media Queries — desktop enhancements (min-width: 768px)
   ============================================================ */
@media (min-width: 768px) {
  h1 {
    font-size: 2rem;
  }

  .project-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-inner {
    flex-direction: row;
    align-items: center;
    text-align: left;
    gap: var(--space-6);
  }

  .hero-tagline {
    font-size: 1.05rem;
  }

  .stat-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}