/*
Theme Name:   GeneratePress Yaw
Description:  Child theme for Yaw Sampene Buadu — editorial personal site
Author:       Yaw Sampene Buadu
Template:     generatepress
Version:      1.0.0
*/

/* ============================================================
   LIGHT THEME (default)
   ============================================================ */
:root {
  --bg:          #f5f2ec;
  --surface:     #ede9e1;
  --surface2:    #e4e0d6;
  --border:      rgba(26,24,20,0.11);
  --amber:       #9a6e18;
  --amber-light: #b8891e;
  --text:        #1a1816;
  --text-muted:  #4e4a44;
  --text-dim:    #8a8478;
  --nav-bg:      rgba(245,242,236,0.92);
  --serif:       'Crimson Pro', Georgia, serif;
  --sans:        'DM Sans', system-ui, sans-serif;
  --mono:        'DM Mono', monospace;
}

/* ============================================================
   DARK THEME
   ============================================================ */
[data-theme="dark"] {
  --bg:          #0c0c0b;
  --surface:     #141413;
  --surface2:    #1c1c1a;
  --border:      rgba(255,255,255,0.08);
  --amber:       #c8962a;
  --amber-light: #e0b45a;
  --text:        #e8e4dc;
  --text-muted:  #8a8680;
  --text-dim:    #555250;
  --nav-bg:      rgba(12,12,11,0.88);
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-weight: 300;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  margin: 0;
  padding: 0;
  transition: background 0.3s ease, color 0.3s ease;
}

/* ============================================================
   GENERATEPRESS OVERRIDES
   ============================================================ */
.site-header,
.main-navigation,
#site-navigation,
.inside-header,
.site-footer { display: none !important; }

.site-main,
.content-area,
.site-content {
  width: 100%;
  max-width: 100%;
  padding: 0;
  margin: 0;
  float: none;
}

/* ============================================================
   THEME TOGGLE
   ============================================================ */
.ysb-theme-toggle {
  background: none;
  border: 1px solid var(--border);
  cursor: pointer;
  padding: 0.35rem 0.65rem;
  border-radius: 2px;
  color: var(--text-muted);
  font-size: 0.85rem;
  line-height: 1;
  transition: border-color 0.2s, color 0.2s;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.ysb-theme-toggle:hover {
  border-color: var(--amber);
  color: var(--amber);
}

.ysb-theme-toggle .icon-sun  { display: none; }
.ysb-theme-toggle .icon-moon { display: inline; }

[data-theme="dark"] .ysb-theme-toggle .icon-sun  { display: inline; }
[data-theme="dark"] .ysb-theme-toggle .icon-moon { display: none; }

/* ============================================================
   NAV
   ============================================================ */
.ysb-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 4rem;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s ease;
}

.ysb-nav__name {
  font-family: var(--serif);
  font-weight: 300;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  color: var(--text);
  text-decoration: none;
}

.ysb-nav__right {
  display: flex;
  align-items: center;
  gap: 2.5rem;
}

.ysb-nav__links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.ysb-nav__links a {
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

.ysb-nav__links a:hover { color: var(--amber-light); }

/* ============================================================
   HERO
   ============================================================ */
.ysb-hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 8rem 4rem 5rem;
  position: relative;
  overflow: hidden;
}

.ysb-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 80% 20%, rgba(154,110,24,0.05) 0%, transparent 70%),
    radial-gradient(ellipse 40% 60% at 10% 80%, rgba(154,110,24,0.03) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

[data-theme="dark"] .ysb-hero::before {
  background:
    radial-gradient(ellipse 60% 50% at 80% 20%, rgba(200,150,42,0.06) 0%, transparent 70%),
    radial-gradient(ellipse 40% 60% at 10% 80%, rgba(200,150,42,0.04) 0%, transparent 60%);
}

/* Background blend mode */
.ysb-hero--bg {
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
}

/* Overlay: fades the image into the page colour — opaque at bottom where text sits */
.ysb-hero--bg::before {
  background:
    linear-gradient(
      to bottom,
      rgba(245,242,236,0.22) 0%,
      rgba(245,242,236,0.55) 50%,
      rgba(245,242,236,0.93) 78%,
      rgba(245,242,236,1)    100%
    ) !important;
}

[data-theme="dark"] .ysb-hero--bg::before {
  background:
    linear-gradient(
      to bottom,
      rgba(12,12,11,0.22) 0%,
      rgba(12,12,11,0.55) 50%,
      rgba(12,12,11,0.93) 78%,
      rgba(12,12,11,1)    100%
    ) !important;
}

/* Ensure hero content sits above the overlay */
.ysb-hero--bg .ysb-hero__label,
.ysb-hero--bg .ysb-hero__title,
.ysb-hero--bg .ysb-hero__sub,
.ysb-hero--bg .ysb-hero__links,
.ysb-hero--bg .ysb-scroll-indicator {
  position: relative;
  z-index: 1;
}

.ysb-hero__label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  color: var(--amber);
  text-transform: uppercase;
  margin-bottom: 1.5rem;
  opacity: 0;
  animation: fadeUp 0.8s ease 0.2s forwards;
}

.ysb-hero__title {
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(3rem, 7vw, 5.5rem);
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--text);
  max-width: 900px;
  margin: 0;
  opacity: 0;
  animation: fadeUp 0.8s ease 0.35s forwards;
}

.ysb-hero__title em {
  font-style: italic;
  color: var(--amber-light);
}

.ysb-hero__sub {
  margin-top: 2rem;
  max-width: 540px;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.8;
  opacity: 0;
  animation: fadeUp 0.8s ease 0.5s forwards;
}

.ysb-hero__links {
  margin-top: 2.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  opacity: 0;
  animation: fadeUp 0.8s ease 0.65s forwards;
}

.ysb-btn {
  display: inline-block;
  padding: 0.7rem 1.8rem;
  border: 1px solid var(--amber);
  color: var(--amber-light);
  font-family: var(--sans);
  font-size: 0.8rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  transition: background 0.2s, color 0.2s;
}

.ysb-btn:hover {
  background: var(--amber);
  color: var(--bg);
}

.ysb-hero__email {
  font-size: 0.8rem;
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.2s;
}

.ysb-hero__email:hover { color: var(--text-muted); }

/* Hero portrait */
.ysb-hero__portrait {
  position: absolute;
  top: 50%;
  right: 5rem;
  transform: translateY(-50%);
  width: clamp(200px, 26vw, 380px);
  aspect-ratio: 3 / 4;
  overflow: hidden;
  opacity: 0;
  animation: fadeUp 0.9s ease 0.5s forwards;
}

.ysb-hero__portrait::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 1px solid var(--amber);
  pointer-events: none;
  opacity: 0.4;
}

.ysb-hero__portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  display: block;
  filter: grayscale(8%);
}

@media (max-width: 960px) {
  .ysb-hero__portrait {
    position: relative;
    top: auto;
    right: auto;
    transform: none;
    width: clamp(140px, 40vw, 220px);
    margin: 0 auto 2.5rem;
    animation: fadeUp 0.8s ease 0.2s forwards;
  }
}

.ysb-scroll-indicator {
  position: absolute;
  bottom: 2.5rem;
  right: 4rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  opacity: 0;
  animation: fadeUp 0.8s ease 0.9s forwards;
}

.ysb-scroll-indicator span {
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-dim);
  writing-mode: vertical-rl;
}

.ysb-scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--amber), transparent);
}

/* ============================================================
   SECTIONS
   ============================================================ */
.ysb-section {
  padding: 7rem 4rem;
  border-top: 1px solid var(--border);
}

.ysb-section-header {
  display: flex;
  align-items: baseline;
  gap: 2rem;
  margin-bottom: 4rem;
}

.ysb-section-num {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--amber);
  letter-spacing: 0.1em;
}

.ysb-section-title {
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: -0.01em;
  color: var(--text);
  margin: 0;
}

.ysb-section-rule {
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ============================================================
   SECTION BANNER IMAGE
   ============================================================ */
.ysb-section-banner {
  width: 100%;
  aspect-ratio: 14 / 3;
  overflow: hidden;
  margin-bottom: 3.5rem;
  position: relative;
}

.ysb-section-banner img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: grayscale(12%);
}

.ysb-section-banner::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, var(--bg) 0%, transparent 35%, transparent 65%, var(--bg) 100%);
  pointer-events: none;
}

/* Section description (Teaching, Technical Leadership) */
.ysb-section-description {
  max-width: 640px;
  font-family: var(--serif);
  font-size: 1.1rem;
  font-weight: 300;
  line-height: 1.85;
  color: var(--text-muted);
  margin-bottom: 3.5rem;
}

.ysb-section-description strong {
  color: var(--text);
  font-weight: 400;
}

/* ============================================================
   EMPTY STATE
   ============================================================ */
.ysb-empty {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  letter-spacing: 0.08em;
  padding: 1.5rem 0;
  border-top: 1px solid var(--border);
}

/* ============================================================
   RESEARCH
   ============================================================ */
.ysb-research-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}

.ysb-research-main {
  padding-right: 4rem;
  border-right: 1px solid var(--border);
}

.ysb-research-main p {
  font-size: 1.1rem;
  font-family: var(--serif);
  font-weight: 300;
  line-height: 1.85;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.ysb-research-main p strong {
  color: var(--text);
  font-weight: 400;
}

.ysb-pub-block {
  margin-top: 2.5rem;
  padding: 1.5rem;
  border: 1px solid var(--border);
  background: var(--surface);
  position: relative;
}

.ysb-pub-block + .ysb-pub-block {
  margin-top: 1rem;
}

.ysb-pub-block::before {
  content: 'Publication';
  position: absolute;
  top: -0.55rem;
  left: 1rem;
  background: var(--surface);
  padding: 0 0.5rem;
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--amber);
}

.ysb-pub-title {
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 400;
  color: var(--text);
  line-height: 1.5;
  margin-bottom: 0.5rem;
}

.ysb-pub-meta {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 0.75rem;
}

.ysb-pub-doi {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--amber);
  text-decoration: none;
  opacity: 0.8;
  transition: opacity 0.2s;
}

.ysb-pub-doi:hover { opacity: 1; }

.ysb-research-sidebar { padding-left: 4rem; }

.ysb-conf-list {
  list-style: none;
  margin: 0 0 3rem;
  padding: 0;
}

.ysb-conf-list li {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
}

.ysb-conf-list li:first-child { border-top: 1px solid var(--border); }

.ysb-conf-title {
  font-family: var(--serif);
  font-size: 0.95rem;
  color: var(--text);
  margin-bottom: 0.25rem;
  line-height: 1.4;
}

.ysb-conf-meta {
  font-size: 0.78rem;
  color: var(--text-dim);
}

.ysb-conf-meta span {
  color: var(--amber);
  margin-right: 0.5rem;
}

.ysb-interests { margin-top: 2rem; }

.ysb-interests-label {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 1rem;
}

.ysb-tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.ysb-tag {
  font-size: 0.75rem;
  padding: 0.3rem 0.8rem;
  border: 1px solid var(--border);
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

/* ============================================================
   CV ITEM IMAGES
   ============================================================ */

/* Project card image */
.ysb-project-card__image {
  width: calc(100% + 4rem);
  margin: -2rem -2rem 1.5rem;
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.ysb-project-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: grayscale(15%);
  transition: filter 0.35s ease, transform 0.35s ease;
}

.ysb-project-card:hover .ysb-project-card__image img {
  filter: grayscale(0%);
  transform: scale(1.02);
}

/* Publication block image */
.ysb-pub-block__image {
  float: right;
  margin: 0 0 0.75rem 1.25rem;
  width: 90px;
  flex-shrink: 0;
}

.ysb-pub-block__image img {
  width: 100%;
  display: block;
  border: 1px solid var(--border);
}

/* Teaching block image */
.ysb-teaching-block__image {
  width: 100%;
  aspect-ratio: 16 / 7;
  overflow: hidden;
  margin-bottom: 1.25rem;
}

.ysb-teaching-block__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: grayscale(10%);
  transition: filter 0.35s ease;
}

.ysb-teaching-block:hover .ysb-teaching-block__image img {
  filter: grayscale(0%);
}

/* ============================================================
   TECHNICAL
   ============================================================ */
.ysb-projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  margin-bottom: 4rem;
}

.ysb-project-card {
  background: var(--bg);
  padding: 2rem;
  transition: background 0.2s;
}

.ysb-project-card:hover { background: var(--surface); }
.ysb-project-card--filler { background: var(--bg); pointer-events: none; }

.ysb-project-tag {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 0.75rem;
}

.ysb-project-name {
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--text);
  line-height: 1.3;
  margin-bottom: 0.5rem;
}

.ysb-project-stat {
  font-family: var(--mono);
  font-size: 1.4rem;
  font-weight: 300;
  color: var(--amber-light);
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.ysb-project-desc {
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.65;
}

.ysb-tech-skills {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}

.ysb-skill-group-label {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.ysb-skill-items { list-style: none; margin: 0; padding: 0; }

.ysb-skill-items li {
  font-size: 0.82rem;
  color: var(--text-muted);
  padding: 0.2rem 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.ysb-skill-items li::before {
  content: '';
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--text-dim);
  flex-shrink: 0;
}

/* ============================================================
   TEACHING
   ============================================================ */
.ysb-teaching-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  margin-bottom: 4rem;
}

.ysb-teaching-block {
  border-top: 2px solid var(--amber);
  padding-top: 1.5rem;
}

.ysb-teaching-role {
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 400;
  color: var(--text);
  margin-bottom: 0.25rem;
}

.ysb-teaching-where {
  font-size: 0.82rem;
  color: var(--text-dim);
  margin-bottom: 1.25rem;
  font-family: var(--mono);
  letter-spacing: 0.04em;
}

.ysb-teaching-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 1.25rem;
}

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

.ysb-module-list li {
  font-size: 0.82rem;
  color: var(--text-dim);
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.ysb-module-list li::before {
  content: '\2014';
  color: var(--amber);
  flex-shrink: 0;
  font-size: 0.75rem;
  margin-top: 0.05rem;
}

.ysb-frameworks-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  margin-top: 2rem;
}

.ysb-framework-cell {
  background: var(--surface);
  padding: 1.25rem 1.5rem;
}

.ysb-framework-name {
  font-family: var(--serif);
  font-size: 1.05rem;
  color: var(--text);
  margin-bottom: 0.25rem;
}

.ysb-framework-desc {
  font-size: 0.78rem;
  color: var(--text-dim);
}

/* ============================================================
   FOOTER
   ============================================================ */
.ysb-footer {
  border-top: 1px solid var(--border);
  padding: 3rem 4rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.ysb-footer__name {
  font-family: var(--serif);
  font-weight: 300;
  font-size: 1rem;
  color: var(--text-muted);
}

.ysb-footer__links {
  display: flex;
  gap: 2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.ysb-footer__links a {
  font-size: 0.78rem;
  color: var(--text-dim);
  text-decoration: none;
  letter-spacing: 0.04em;
  transition: color 0.2s;
}

.ysb-footer__links a:hover { color: var(--amber-light); }

.ysb-footer__copy {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--text-dim);
}

/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 960px) {
  .ysb-nav          { padding: 1.25rem 2rem; }
  .ysb-hero         { padding: 7rem 2rem 4rem; }
  .ysb-section      { padding: 5rem 2rem; }
  .ysb-research-grid,
  .ysb-teaching-grid { grid-template-columns: 1fr; }
  .ysb-research-main {
    padding-right: 0;
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding-bottom: 3rem;
    margin-bottom: 3rem;
  }
  .ysb-research-sidebar { padding-left: 0; }
  .ysb-projects-grid    { grid-template-columns: 1fr 1fr; }
  .ysb-tech-skills      { grid-template-columns: 1fr 1fr; }
  .ysb-frameworks-strip { grid-template-columns: 1fr; }
  .ysb-footer {
    flex-direction: column;
    gap: 1.5rem;
    text-align: center;
    padding: 2.5rem 2rem;
  }
  .ysb-scroll-indicator { display: none; }
}

@media (max-width: 600px) {
  .ysb-nav__links         { display: none; }
  .ysb-projects-grid      { grid-template-columns: 1fr; }
  .ysb-tech-skills        { grid-template-columns: 1fr; }
  .ysb-hero__title        { font-size: 2.5rem; }
}