/* ============================================================
   ProjectBased.AI — Shared Styles
   Light-theme foundation for all pages
   ============================================================ */

:root {
  --bg: #FAFAF8;
  --bg-section: #F3F2EE;
  --text: #1a1a1a;
  --text-mid: #3a3a3a;
  --text-muted: #7a7775;
  --plum: #5A2650;
  --plum-bright: #6E3363;
  --plum-hover: #703566;
  --plum-light: rgba(90,38,80,0.06);
  --border: rgba(26,26,26,0.1);
  --border-faint: rgba(26,26,26,0.05);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Plus Jakarta Sans', sans-serif;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* =================== NAV =================== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0; z-index: 100;
  padding: 1.5rem 6vw;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(250,250,248,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-faint);
}

.nav-name {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--plum);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.nav-back {
  font-weight: 400;
  font-size: 0.75rem;
  color: var(--text-muted);
  text-decoration: none;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: color 0.3s ease;
}

.nav-back:hover { color: var(--plum); }

.nav-hamburger {
  background: none;
  border: none;
  font-size: 1.4rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.3s ease;
  line-height: 1;
  padding: 0;
}

.nav-hamburger:hover { color: var(--plum); }

/* =================== NAV OVERLAY =================== */
.nav-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  z-index: 200;
  background: rgba(90,38,80,0.95);
  backdrop-filter: blur(16px);
  display: flex;
  flex-direction: column;
  padding: 1.5rem 6vw 4rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.nav-overlay.open {
  opacity: 1;
  pointer-events: all;
}

.nav-overlay-header {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 6vh;
}

.nav-overlay-close {
  background: none;
  border: none;
  font-size: 1.6rem;
  color: rgba(255,255,255,0.6);
  cursor: pointer;
  transition: color 0.3s ease;
  line-height: 1;
  padding: 0;
}

.nav-overlay-close:hover { color: #fff; }

.nav-overlay-content {
  max-width: 560px;
  margin: 0 auto;
  width: 100%;
}

.nav-overlay .section-header {
  font-weight: 800;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  line-height: 1.6;
  color: rgba(255,255,255,0.5);
  margin-bottom: 1.2rem;
}

.nav-overlay .section-header-ai {
  font-weight: 800;
  font-size: 0.88rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  line-height: 1.6;
  color: rgba(255,255,255,0.5);
  margin-top: 2.5rem;
  margin-bottom: 1.2rem;
}

.nav-overlay .chapter-list {
  list-style: none;
  display: flex;
  flex-direction: column;
}

.nav-overlay .chapter-item {
  position: relative;
  padding: 1.1rem 1.2rem;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  border-radius: 4px;
  transition: all 0.35s ease;
}

.nav-overlay .chapter-item a {
  text-decoration: none;
  color: inherit;
  display: block;
}

.nav-overlay .chapter-number {
  font-weight: 300;
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  color: rgba(255,255,255,0.4);
  margin-bottom: 0.3rem;
  transition: color 0.35s ease;
}

.nav-overlay .chapter-title {
  font-weight: 400;
  font-size: clamp(0.95rem, 1.2vw, 1.1rem);
  color: rgba(255,255,255,0.7);
  transition: all 0.35s ease;
  letter-spacing: -0.01em;
}

.nav-overlay .chapter-item:hover {
  background: rgba(255,255,255,0.08);
}

.nav-overlay .chapter-item:hover .chapter-title {
  color: #fff;
}

.nav-overlay .chapter-item:hover .chapter-number {
  color: rgba(255,255,255,0.7);
}

.nav-overlay .chapter-item.active .chapter-title {
  color: #fff;
  font-weight: 600;
}

.nav-overlay .chapter-item.active .chapter-number {
  color: #fff;
}

/* =================== PAGE HEADER =================== */
.page-header {
  padding: 16vh 6vw 4vh;
  max-width: 900px;
}

.page-chapter {
  font-weight: 400;
  font-size: 0.68rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--plum);
  margin-bottom: 1.5rem;
}

.page-title {
  font-weight: 700;
  font-size: clamp(2rem, 3.5vw, 3rem);
  letter-spacing: -0.03em;
  color: var(--text);
  line-height: 1.1;
}

/* =================== TWO-COLUMN LAYOUT =================== */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5vw;
  padding: 6vh 6vw 10vh;
  align-items: start;
}

.col-left {
  position: sticky;
  top: 10vh;
}

.col-right {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* =================== STORY =================== */
.story {
  font-weight: 300;
  font-size: clamp(0.95rem, 1.15vw, 1.08rem);
  line-height: 1.85;
  color: var(--text-mid);
  margin-bottom: 2rem;
}

.story .highlight {
  color: var(--text);
  font-weight: 400;
}

.story p + p {
  margin-top: 1.2rem;
}

/* =================== ERA TAG =================== */
.era-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  margin-bottom: 3.5rem;
}

/* =================== CLIENTS =================== */
.clients-block {
  border-top: 1px solid var(--border);
  padding-top: 2.5rem;
}

.clients-section {
  margin-bottom: 2.5rem;
}

.clients-label {
  font-weight: 500;
  font-size: 0.65rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.clients-list {
  font-weight: 500;
  font-size: 1rem;
  line-height: 2;
  color: var(--plum);
}

.clients-list .separator {
  color: var(--border);
  margin: 0 0.3rem;
}

.client-highlight {
  color: var(--plum);
  font-weight: 600;
  font-size: 1rem;
}

.clients-note {
  font-weight: 300;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-style: italic;
  margin-top: 0.5rem;
  line-height: 1.5;
}

/* =================== CAPABILITIES =================== */
.capabilities-block {
  border-top: 1px solid var(--border);
  padding-top: 2.5rem;
  margin-bottom: 2.5rem;
}

.capabilities-label {
  font-weight: 500;
  font-size: 0.65rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.capabilities-list {
  font-weight: 500;
  font-size: 1rem;
  line-height: 2;
  color: var(--plum);
}

.capabilities-list .separator {
  color: var(--border);
  margin: 0 0.3rem;
}

/* =================== TECH STACK =================== */
.tech-block {
  border-top: 1px solid var(--border);
  padding-top: 2.5rem;
  margin-bottom: 2.5rem;
}

.tech-label {
  font-weight: 500;
  font-size: 0.65rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--plum);
  margin-bottom: 1rem;
}

.tech-list {
  font-weight: 300;
  font-size: 0.88rem;
  line-height: 2;
  color: var(--text-muted);
}

.tech-list .separator {
  color: var(--border);
  margin: 0 0.3rem;
}

/* =================== LOGO GRID =================== */
.logo-grid-label {
  font-weight: 500;
  font-size: 0.65rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--plum);
  margin-bottom: 1.5rem;
}

.logo-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border-faint);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}

.logo-cell {
  aspect-ratio: 1/1;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.4rem;
  transition: all 0.35s ease;
}

.logo-cell:hover { background: var(--plum-light); }

.logo-cell img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.logo-placeholder {
  font-weight: 300;
  font-size: 0.65rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.4;
}

/* =================== IMPACT =================== */
.impact-section {
  padding: 8vh 6vw;
  background: var(--bg-section);
  border-top: 1px solid var(--border);
}

.impact-label {
  font-weight: 400;
  font-size: 0.68rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 3rem;
}

.impact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.5rem 4vw;
}

.impact-item {
  border-left: 2px solid var(--plum);
  padding-left: 1.5rem;
}

.impact-stat {
  font-weight: 600;
  font-size: clamp(0.95rem, 1.2vw, 1.1rem);
  color: var(--text);
  margin-bottom: 0.4rem;
  letter-spacing: -0.01em;
}

.impact-desc {
  font-weight: 300;
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--text-muted);
}

/* =================== PRESS =================== */
.press-row {
  display: flex;
  gap: 3rem;
  align-items: center;
  margin-top: 4rem;
  padding-top: 3rem;
  border-top: 1px solid var(--border-faint);
  max-width: 900px;
}

.press-label-inline {
  font-weight: 300;
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
  white-space: nowrap;
}

.press-logos {
  display: flex;
  gap: 2.5rem;
  align-items: center;
  flex-wrap: wrap;
}

.press-logo {
  font-weight: 600;
  font-size: 0.8rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  opacity: 0.5;
}

/* =================== THROUGHLINE =================== */
.throughline-section {
  padding: 8vh 6vw;
  border-top: 1px solid var(--border);
}

.throughline-col {
  max-width: 640px;
}

.throughline-text {
  font-weight: 300;
  font-size: clamp(1.1rem, 1.5vw, 1.3rem);
  line-height: 1.5;
  color: var(--text-mid);
  margin-bottom: 3rem;
  max-width: 640px;
}

.throughline-text em {
  font-style: italic;
  font-weight: 600;
  color: var(--plum);
}

.next-link {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  font-weight: 500;
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--plum);
  text-decoration: none;
  transition: gap 0.3s ease;
}

.next-link:hover { gap: 1.2rem; }

/* =================== CREDENTIAL =================== */
.credential-block {
  background: var(--plum-light);
  border-left: 3px solid var(--plum);
  padding: 1.8rem 2rem;
  border-radius: 4px;
}

.credential-label {
  font-weight: 500;
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--plum);
  margin-bottom: 0.8rem;
}

.credential-title {
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
  margin-bottom: 0.4rem;
}

.credential-source {
  font-weight: 300;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* =================== VIDEO ITEMS =================== */
.video-item {
  aspect-ratio: 16/9;
  background: #e8e5e0;
  border-radius: 6px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all 0.35s ease;
  position: relative;
  overflow: hidden;
}

.video-item:hover {
  border-color: var(--plum);
  box-shadow: 0 4px 24px rgba(90,38,80,0.08);
}

.video-play {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--plum);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.8rem;
  opacity: 0.8;
  transition: opacity 0.35s ease;
}

.video-item:hover .video-play { opacity: 1; }

.video-play::after {
  content: '';
  display: block;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 8px 0 8px 15px;
  border-color: transparent transparent transparent white;
  margin-left: 3px;
}

.video-label {
  font-weight: 500;
  font-size: 0.85rem;
  color: var(--text-mid);
}

.video-sub {
  font-weight: 300;
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 0.3rem;
}

.video-embed-block {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.video-embed-wrapper {
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.video-headline {
  display: block;
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text);
  text-decoration: none;
  line-height: 1.4;
  margin-top: 0.5rem;
  transition: color 0.3s ease;
}

.video-headline:hover { color: var(--plum); }

.video-headline-meta {
  font-weight: 300;
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-top: 0.2rem;
}

.video-headline-byline {
  font-weight: 500;
  color: var(--plum);
}

/* =================== WORK ITEMS =================== */
.work-item {
  background: #e8e5e0;
  border-radius: 6px;
  border: 1px solid var(--border);
  overflow: hidden;
  cursor: pointer;
  transition: all 0.35s ease;
}

.work-item:hover {
  border-color: var(--plum);
  box-shadow: 0 4px 24px rgba(90,38,80,0.08);
}

.work-thumb {
  aspect-ratio: 16/9;
  background: #dddad5;
  display: flex;
  align-items: center;
  justify-content: center;
}

.work-thumb-text {
  font-weight: 300;
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.work-info { padding: 1.2rem 1.4rem; }

.work-title {
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--text-mid);
  margin-bottom: 0.3rem;
}

.work-type {
  font-weight: 300;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.work-client {
  font-weight: 400;
  font-size: 0.7rem;
  color: var(--plum);
  margin-top: 0.4rem;
  letter-spacing: 0.05em;
}

/* =================== CONTACT BAR =================== */
.contact-bar {
  padding: 4rem 6vw;
  text-align: center;
  background: var(--bg);
  border-top: 1px solid var(--border-faint);
}

.contact-bar a {
  font-weight: 400;
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  color: var(--plum);
  text-decoration: none;
  transition: all 0.3s ease;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}

.contact-bar a:hover {
  color: var(--plum-hover);
  border-bottom-color: var(--plum-hover);
}

/* =================== RESPONSIVE =================== */
@media (max-width: 768px) {
  .two-col {
    grid-template-columns: 1fr;
    gap: 4vh;
  }
  .col-left {
    position: static;
  }
  .impact-grid {
    grid-template-columns: 1fr;
  }
  .press-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.5rem;
  }
  .logo-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}